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Merge remote-tracking branch 'spi/fix/core' into spi-linus

This commit is contained in:
Mark Brown 2015-04-24 11:10:45 +01:00
parent 39a8804455 f8bb820da4
commit 334c40b17f
39 changed files with 1556 additions and 2746 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
View File

@ -2,11 +2,21 @@
(CSPI/eCSPI) for i.MX
Required properties:
- compatible : Should be "fsl,<soc>-cspi" or "fsl,<soc>-ecspi"
- compatible :
- "fsl,imx1-cspi" for SPI compatible with the one integrated on i.MX1
- "fsl,imx21-cspi" for SPI compatible with the one integrated on i.MX21
- "fsl,imx27-cspi" for SPI compatible with the one integrated on i.MX27
- "fsl,imx31-cspi" for SPI compatible with the one integrated on i.MX31
- "fsl,imx35-cspi" for SPI compatible with the one integrated on i.MX35
- "fsl,imx51-ecspi" for SPI compatible with the one integrated on i.MX51
- reg : Offset and length of the register set for the device
- interrupts : Should contain CSPI/eCSPI interrupt
- fsl,spi-num-chipselects : Contains the number of the chipselect
- cs-gpios : Specifies the gpio pins to be used for chipselects.
- clocks : Clock specifiers for both ipg and per clocks.
- clock-names : Clock names should include both "ipg" and "per"
See the clock consumer binding,
Documentation/devicetree/bindings/clock/clock-bindings.txt
- dmas: DMA specifiers for tx and rx dma. See the DMA client binding,
Documentation/devicetree/bindings/dma/dma.txt
- dma-names: DMA request names should include "tx" and "rx" if present.

8
Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
View File

@ -33,6 +33,11 @@ Optional properties:
nodes. If unspecified, a single SPI device without a chip
select can be used.
- dmas: Two DMA channel specifiers following the convention outlined
in bindings/dma/dma.txt
- dma-names: Names for the dma channels, if present. There must be at
least one channel named "tx" for transmit and named "rx" for
receive.
SPI slave nodes must be children of the SPI master node and can contain
properties described in Documentation/devicetree/bindings/spi/spi-bus.txt
@ -51,6 +56,9 @@ Example:
clocks = <&gcc GCC_BLSP2_QUP2_SPI_APPS_CLK>, <&gcc GCC_BLSP2_AHB_CLK>;
clock-names = "core", "iface";
dmas = <&blsp1_bam 13>, <&blsp1_bam 12>;
dma-names = "rx", "tx";
pinctrl-names = "default";
pinctrl-0 = <&spi8_default>;

8
Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
View File

@ -16,6 +16,12 @@ Optional property:
in big endian mode, otherwise in native mode(same with CPU), for more
detail please see: Documentation/devicetree/bindings/regmap/regmap.txt.
Optional SPI slave node properties:
- fsl,spi-cs-sck-delay: a delay in nanoseconds between activating chip
select and the start of clock signal, at the start of a transfer.
- fsl,spi-sck-cs-delay: a delay in nanoseconds between stopping the clock
signal and deactivating chip select, at the end of a transfer.
Example:
dspi0@4002c000 {
@ -43,6 +49,8 @@ dspi0@4002c000 {
reg = <0>;
linux,modalias = "m25p80";
modal = "at26df081a";
fsl,spi-cs-sck-delay = <100>;
fsl,spi-sck-cs-delay = <50>;
};
};

1
Documentation/devicetree/bindings/spi/spi-img-spfi.txt
View File

@ -14,6 +14,7 @@ Required properties:
- dma-names: Must include the following entries:
- rx
- tx
- cs-gpios: Must specify the GPIOs used for chipselect lines.
- #address-cells: Must be 1.
- #size-cells: Must be 0.

4
Documentation/devicetree/bindings/spi/spi-rockchip.txt
View File

@ -24,6 +24,9 @@ Optional Properties:
- dmas: DMA specifiers for tx and rx dma. See the DMA client binding,
Documentation/devicetree/bindings/dma/dma.txt
- dma-names: DMA request names should include "tx" and "rx" if present.
- rx-sample-delay-ns: nanoseconds to delay after the SCLK edge before sampling
Rx data (may need to be fine tuned for high capacitance lines).
No delay (0) by default.
Example:
@ -33,6 +36,7 @@ Example:
reg = <0xff110000 0x1000>;
dmas = <&pdma1 11>, <&pdma1 12>;
dma-names = "tx", "rx";
rx-sample-delay-ns = <10>;
#address-cells = <1>;
#size-cells = <0>;
interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;

3
Documentation/spi/spi-summary
View File

@ -342,12 +342,11 @@ SPI protocol drivers somewhat resemble platform device drivers:
.driver = {
.name = "CHIP",
.owner = THIS_MODULE,
.pm = &CHIP_pm_ops,
},
.probe = CHIP_probe,
.remove = CHIP_remove,
.suspend = CHIP_suspend,
.resume = CHIP_resume,
};
The driver core will automatically attempt to bind this driver to any SPI

115
Documentation/spi/spidev_test.c
View File

@ -15,6 +15,7 @@
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
@ -34,24 +35,79 @@ static uint32_t mode;
static uint8_t bits = 8;
static uint32_t speed = 500000;
static uint16_t delay;
static int verbose;
static void transfer(int fd)
uint8_t default_tx[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xF0, 0x0D,
};
uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
char *input_tx;
static void hex_dump(const void *src, size_t length, size_t line_size, char *prefix)
{
int i = 0;
const unsigned char *address = src;
const unsigned char *line = address;
unsigned char c;
printf("%s | ", prefix);
while (length-- > 0) {
printf("%02X ", *address++);
if (!(++i % line_size) || (length == 0 && i % line_size)) {
if (length == 0) {
while (i++ % line_size)
printf("__ ");
}
printf(" | "); /* right close */
while (line < address) {
c = *line++;
printf("%c", (c < 33 || c == 255) ? 0x2E : c);
}
printf("\n");
if (length > 0)
printf("%s | ", prefix);
}
}
}
/*
* Unescape - process hexadecimal escape character
* converts shell input "\x23" -> 0x23
*/
int unespcape(char *_dst, char *_src, size_t len)
{
int ret = 0;
char *src = _src;
char *dst = _dst;
unsigned int ch;
while (*src) {
if (*src == '\\' && *(src+1) == 'x') {
sscanf(src + 2, "%2x", &ch);
src += 4;
*dst++ = (unsigned char)ch;
} else {
*dst++ = *src++;
}
ret++;
}
return ret;
}
static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
{
int ret;
uint8_t tx[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xDE, 0xAD, 0xBE, 0xEF, 0xBA, 0xAD,
0xF0, 0x0D,
};
uint8_t rx[ARRAY_SIZE(tx)] = {0, };
struct spi_ioc_transfer tr = {
.tx_buf = (unsigned long)tx,
.rx_buf = (unsigned long)rx,
.len = ARRAY_SIZE(tx),
.len = len,
.delay_usecs = delay,
.speed_hz = speed,
.bits_per_word = bits,
@ -76,12 +132,9 @@ static void transfer(int fd)
if (ret < 1)
pabort("can't send spi message");
for (ret = 0; ret < ARRAY_SIZE(tx); ret++) {
if (!(ret % 6))
puts("");
printf("%.2X ", rx[ret]);
}
puts("");
if (verbose)
hex_dump(tx, len, 32, "TX");
hex_dump(rx, len, 32, "RX");
}
static void print_usage(const char *prog)
@ -97,6 +150,8 @@ static void print_usage(const char *prog)
" -L --lsb least significant bit first\n"
" -C --cs-high chip select active high\n"
" -3 --3wire SI/SO signals shared\n"
" -v --verbose Verbose (show tx buffer)\n"
" -p Send data (e.g. \"1234\\xde\\xad\")\n"
" -N --no-cs no chip select\n"
" -R --ready slave pulls low to pause\n"
" -2 --dual dual transfer\n"
@ -121,12 +176,13 @@ static void parse_opts(int argc, char *argv[])
{ "no-cs", 0, 0, 'N' },
{ "ready", 0, 0, 'R' },
{ "dual", 0, 0, '2' },
{ "verbose", 0, 0, 'v' },
{ "quad", 0, 0, '4' },
{ NULL, 0, 0, 0 },
};
int c;
c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24", lopts, NULL);
c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24p:v", lopts, NULL);
if (c == -1)
break;
@ -165,9 +221,15 @@ static void parse_opts(int argc, char *argv[])
case 'N':
mode |= SPI_NO_CS;
break;
case 'v':
verbose = 1;
break;
case 'R':
mode |= SPI_READY;
break;
case 'p':
input_tx = optarg;
break;
case '2':
mode |= SPI_TX_DUAL;
break;
@ -191,6 +253,9 @@ int main(int argc, char *argv[])
{
int ret = 0;
int fd;
uint8_t *tx;
uint8_t *rx;
int size;
parse_opts(argc, argv);
@ -235,7 +300,17 @@ int main(int argc, char *argv[])
printf("bits per word: %d\n", bits);
printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
transfer(fd);
if (input_tx) {
size = strlen(input_tx+1);
tx = malloc(size);
rx = malloc(size);
size = unespcape((char *)tx, input_tx, size);
transfer(fd, tx, rx, size);
free(rx);
free(tx);
} else {
transfer(fd, default_tx, default_rx, sizeof(default_tx));
}
close(fd);

13
drivers/dma/Kconfig
View File

@ -51,19 +51,6 @@ config INTEL_MIC_X100_DMA
OS and tools for MIC to use with this driver are available from
<http://software.intel.com/en-us/mic-developer>.
config INTEL_MID_DMAC
tristate "Intel MID DMA support for Peripheral DMA controllers"
depends on PCI && X86
select DMA_ENGINE
default n
help
Enable support for the Intel(R) MID DMA engine present
in Intel MID chipsets.
Say Y here if you have such a chipset.
If unsure, say N.
config ASYNC_TX_ENABLE_CHANNEL_SWITCH
bool

1
drivers/dma/Makefile
View File

@ -6,7 +6,6 @@ obj-$(CONFIG_DMA_VIRTUAL_CHANNELS) += virt-dma.o
obj-$(CONFIG_DMA_ACPI) += acpi-dma.o
obj-$(CONFIG_DMA_OF) += of-dma.o
obj-$(CONFIG_INTEL_MID_DMAC) += intel_mid_dma.o
obj-$(CONFIG_DMATEST) += dmatest.o
obj-$(CONFIG_INTEL_IOATDMA) += ioat/
obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o

1447
drivers/dma/intel_mid_dma.c
View File

File diff suppressed because it is too large Load Diff

299
drivers/dma/intel_mid_dma_regs.h
View File

@ -1,299 +0,0 @@
/*
* intel_mid_dma_regs.h - Intel MID DMA Drivers
*
* Copyright (C) 2008-10 Intel Corp
* Author: Vinod Koul <vinod.koul@intel.com>
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*
*/
#ifndef __INTEL_MID_DMAC_REGS_H__
#define __INTEL_MID_DMAC_REGS_H__
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/pci_ids.h>
#define INTEL_MID_DMA_DRIVER_VERSION "1.1.0"
#define REG_BIT0 0x00000001
#define REG_BIT8 0x00000100
#define INT_MASK_WE 0x8
#define CLEAR_DONE 0xFFFFEFFF
#define UNMASK_INTR_REG(chan_num) \
((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
#define MASK_INTR_REG(chan_num) (REG_BIT8 << chan_num)
#define ENABLE_CHANNEL(chan_num) \
((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
#define DISABLE_CHANNEL(chan_num) \
(REG_BIT8 << chan_num)
#define DESCS_PER_CHANNEL 16
/*DMA Registers*/
/*registers associated with channel programming*/
#define DMA_REG_SIZE 0x400
#define DMA_CH_SIZE 0x58
/*CH X REG = (DMA_CH_SIZE)*CH_NO + REG*/
#define SAR 0x00 /* Source Address Register*/
#define DAR 0x08 /* Destination Address Register*/
#define LLP 0x10 /* Linked List Pointer Register*/
#define CTL_LOW 0x18 /* Control Register*/
#define CTL_HIGH 0x1C /* Control Register*/
#define CFG_LOW 0x40 /* Configuration Register Low*/
#define CFG_HIGH 0x44 /* Configuration Register high*/
#define STATUS_TFR 0x2E8
#define STATUS_BLOCK 0x2F0
#define STATUS_ERR 0x308
#define RAW_TFR 0x2C0
#define RAW_BLOCK 0x2C8
#define RAW_ERR 0x2E0
#define MASK_TFR 0x310
#define MASK_BLOCK 0x318
#define MASK_SRC_TRAN 0x320
#define MASK_DST_TRAN 0x328
#define MASK_ERR 0x330
#define CLEAR_TFR 0x338
#define CLEAR_BLOCK 0x340
#define CLEAR_SRC_TRAN 0x348
#define CLEAR_DST_TRAN 0x350
#define CLEAR_ERR 0x358
#define INTR_STATUS 0x360
#define DMA_CFG 0x398
#define DMA_CHAN_EN 0x3A0
/*DMA channel control registers*/
union intel_mid_dma_ctl_lo {
struct {
u32 int_en:1; /*enable or disable interrupts*/
/*should be 0*/
u32 dst_tr_width:3; /*destination transfer width*/
/*usually 32 bits = 010*/
u32 src_tr_width:3; /*source transfer width*/
/*usually 32 bits = 010*/
u32 dinc:2; /*destination address inc/dec*/
/*For mem:INC=00, Periphral NoINC=11*/
u32 sinc:2; /*source address inc or dec, as above*/
u32 dst_msize:3; /*destination burst transaction length*/
/*always = 16 ie 011*/
u32 src_msize:3; /*source burst transaction length*/
/*always = 16 ie 011*/
u32 reser1:3;
u32 tt_fc:3; /*transfer type and flow controller*/
/*M-M = 000
P-M = 010
M-P = 001*/
u32 dms:2; /*destination master select = 0*/
u32 sms:2; /*source master select = 0*/
u32 llp_dst_en:1; /*enable/disable destination LLP = 0*/
u32 llp_src_en:1; /*enable/disable source LLP = 0*/
u32 reser2:3;
} ctlx;
u32 ctl_lo;
};
union intel_mid_dma_ctl_hi {
struct {
u32 block_ts:12; /*block transfer size*/
u32 done:1; /*Done - updated by DMAC*/
u32 reser:19; /*configured by DMAC*/
} ctlx;
u32 ctl_hi;
};
/*DMA channel configuration registers*/
union intel_mid_dma_cfg_lo {
struct {
u32 reser1:5;
u32 ch_prior:3; /*channel priority = 0*/
u32 ch_susp:1; /*channel suspend = 0*/
u32 fifo_empty:1; /*FIFO empty or not R bit = 0*/
u32 hs_sel_dst:1; /*select HW/SW destn handshaking*/
/*HW = 0, SW = 1*/
u32 hs_sel_src:1; /*select HW/SW src handshaking*/
u32 reser2:6;
u32 dst_hs_pol:1; /*dest HS interface polarity*/
u32 src_hs_pol:1; /*src HS interface polarity*/
u32 max_abrst:10; /*max AMBA burst len = 0 (no sw limit*/
u32 reload_src:1; /*auto reload src addr =1 if src is P*/
u32 reload_dst:1; /*AR destn addr =1 if dstn is P*/
} cfgx;
u32 cfg_lo;
};
union intel_mid_dma_cfg_hi {
struct {
u32 fcmode:1; /*flow control mode = 1*/
u32 fifo_mode:1; /*FIFO mode select = 1*/
u32 protctl:3; /*protection control = 0*/
u32 rsvd:2;
u32 src_per:4; /*src hw HS interface*/
u32 dst_per:4; /*dstn hw HS interface*/
u32 reser2:17;
} cfgx;
u32 cfg_hi;
};
/**
* struct intel_mid_dma_chan - internal mid representation of a DMA channel
* @chan: dma_chan strcture represetation for mid chan
* @ch_regs: MMIO register space pointer to channel register
* @dma_base: MMIO register space DMA engine base pointer
* @ch_id: DMA channel id
* @lock: channel spinlock
* @active_list: current active descriptors
* @queue: current queued up descriptors
* @free_list: current free descriptors
* @slave: dma slave structure
* @descs_allocated: total number of descriptors allocated
* @dma: dma device structure pointer
* @busy: bool representing if ch is busy (active txn) or not
* @in_use: bool representing if ch is in use or not
* @raw_tfr: raw trf interrupt received
* @raw_block: raw block interrupt received
*/
struct intel_mid_dma_chan {
struct dma_chan chan;
void __iomem *ch_regs;
void __iomem *dma_base;
int ch_id;
spinlock_t lock;
struct list_head active_list;
struct list_head queue;
struct list_head free_list;
unsigned int descs_allocated;
struct middma_device *dma;
bool busy;
bool in_use;
u32 raw_tfr;
u32 raw_block;
struct intel_mid_dma_slave *mid_slave;
};
static inline struct intel_mid_dma_chan *to_intel_mid_dma_chan(
struct dma_chan *chan)
{
return container_of(chan, struct intel_mid_dma_chan, chan);
}
enum intel_mid_dma_state {
RUNNING = 0,
SUSPENDED,
};
/**
* struct middma_device - internal representation of a DMA device
* @pdev: PCI device
* @dma_base: MMIO register space pointer of DMA
* @dma_pool: for allocating DMA descriptors
* @common: embedded struct dma_device
* @tasklet: dma tasklet for processing interrupts
* @ch: per channel data
* @pci_id: DMA device PCI ID
* @intr_mask: Interrupt mask to be used
* @mask_reg: MMIO register for periphral mask
* @chan_base: Base ch index (read from driver data)
* @max_chan: max number of chs supported (from drv_data)
* @block_size: Block size of DMA transfer supported (from drv_data)
* @pimr_mask: MMIO register addr for periphral interrupt (from drv_data)
* @state: dma PM device state
*/
struct middma_device {
struct pci_dev *pdev;
void __iomem *dma_base;
struct pci_pool *dma_pool;
struct dma_device common;
struct tasklet_struct tasklet;
struct intel_mid_dma_chan ch[MAX_CHAN];
unsigned int pci_id;
unsigned int intr_mask;
void __iomem *mask_reg;
int chan_base;
int max_chan;
int block_size;
unsigned int pimr_mask;
enum intel_mid_dma_state state;
};
static inline struct middma_device *to_middma_device(struct dma_device *common)
{
return container_of(common, struct middma_device, common);
}
struct intel_mid_dma_desc {
void __iomem *block; /*ch ptr*/
struct list_head desc_node;
struct dma_async_tx_descriptor txd;
size_t len;
dma_addr_t sar;
dma_addr_t dar;
u32 cfg_hi;
u32 cfg_lo;
u32 ctl_lo;
u32 ctl_hi;
struct pci_pool *lli_pool;
struct intel_mid_dma_lli *lli;
dma_addr_t lli_phys;
unsigned int lli_length;
unsigned int current_lli;
dma_addr_t next;
enum dma_transfer_direction dirn;
enum dma_status status;
enum dma_slave_buswidth width; /*width of DMA txn*/
enum intel_mid_dma_mode cfg_mode; /*mode configuration*/
};
struct intel_mid_dma_lli {
dma_addr_t sar;
dma_addr_t dar;
dma_addr_t llp;
u32 ctl_lo;
u32 ctl_hi;
} __attribute__ ((packed));
static inline int test_ch_en(void __iomem *dma, u32 ch_no)
{
u32 en_reg = ioread32(dma + DMA_CHAN_EN);
return (en_reg >> ch_no) & 0x1;
}
static inline struct intel_mid_dma_desc *to_intel_mid_dma_desc
(struct dma_async_tx_descriptor *txd)
{
return container_of(txd, struct intel_mid_dma_desc, txd);
}
static inline struct intel_mid_dma_slave *to_intel_mid_dma_slave
(struct dma_slave_config *slave)
{
return container_of(slave, struct intel_mid_dma_slave, dma_slave);
}
int dma_resume(struct device *dev);
#endif /*__INTEL_MID_DMAC_REGS_H__*/

5
drivers/spi/Kconfig
View File

@ -159,10 +159,9 @@ config SPI_BUTTERFLY
config SPI_CADENCE
tristate "Cadence SPI controller"
depends on ARM
help
This selects the Cadence SPI controller master driver
used by Xilinx Zynq.
used by Xilinx Zynq and ZynqMP.
config SPI_CLPS711X
tristate "CLPS711X host SPI controller"
@ -632,7 +631,7 @@ config SPI_DW_PCI
config SPI_DW_MID_DMA
bool "DMA support for DW SPI controller on Intel MID platform"
depends on SPI_DW_PCI && INTEL_MID_DMAC
depends on SPI_DW_PCI && DW_DMAC_PCI
config SPI_DW_MMIO
tristate "Memory-mapped io interface driver for DW SPI core"

8
drivers/spi/spi-atmel.c
View File

@ -180,11 +180,17 @@
| SPI_BF(name, value))
/* Register access macros */
#ifdef CONFIG_AVR32
#define spi_readl(port, reg) \
__raw_readl((port)->regs + SPI_##reg)
#define spi_writel(port, reg, value) \
__raw_writel((value), (port)->regs + SPI_##reg)
#else
#define spi_readl(port, reg) \
readl_relaxed((port)->regs + SPI_##reg)
#define spi_writel(port, reg, value) \
writel_relaxed((value), (port)->regs + SPI_##reg)
#endif
/* use PIO for small transfers, avoiding DMA setup/teardown overhead and
* cache operations; better heuristics consider wordsize and bitrate.
*/

423
drivers/spi/spi-bcm2835.c
View File

@ -3,6 +3,7 @@
*
* Copyright (C) 2012 Chris Boot
* Copyright (C) 2013 Stephen Warren
* Copyright (C) 2015 Martin Sperl
*
* This driver is inspired by:
* spi-ath79.c, Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
@ -29,6 +30,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <linux/spi/spi.h>
@ -66,8 +68,10 @@
#define BCM2835_SPI_CS_CS_10 0x00000002
#define BCM2835_SPI_CS_CS_01 0x00000001
#define BCM2835_SPI_TIMEOUT_MS 30000
#define BCM2835_SPI_MODE_BITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS)
#define BCM2835_SPI_POLLING_LIMIT_US 30
#define BCM2835_SPI_TIMEOUT_MS 30000
#define BCM2835_SPI_MODE_BITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \
| SPI_NO_CS | SPI_3WIRE)
#define DRV_NAME "spi-bcm2835"
@ -75,10 +79,10 @@ struct bcm2835_spi {
void __iomem *regs;
struct clk *clk;
int irq;
struct completion done;
const u8 *tx_buf;
u8 *rx_buf;
int len;
int tx_len;
int rx_len;
};
static inline u32 bcm2835_rd(struct bcm2835_spi *bs, unsigned reg)
@ -91,205 +95,315 @@ static inline void bcm2835_wr(struct bcm2835_spi *bs, unsigned reg, u32 val)
writel(val, bs->regs + reg);
}
static inline void bcm2835_rd_fifo(struct bcm2835_spi *bs, int len)
static inline void bcm2835_rd_fifo(struct bcm2835_spi *bs)
{
u8 byte;
while (len--) {
while ((bs->rx_len) &&
(bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_RXD)) {
byte = bcm2835_rd(bs, BCM2835_SPI_FIFO);
if (bs->rx_buf)
*bs->rx_buf++ = byte;
bs->rx_len--;
}
}
static inline void bcm2835_wr_fifo(struct bcm2835_spi *bs, int len)
static inline void bcm2835_wr_fifo(struct bcm2835_spi *bs)
{
u8 byte;
if (len > bs->len)
len = bs->len;
while (len--) {
while ((bs->tx_len) &&
(bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_TXD)) {
byte = bs->tx_buf ? *bs->tx_buf++ : 0;
bcm2835_wr(bs, BCM2835_SPI_FIFO, byte);
bs->len--;
bs->tx_len--;
}
}
static void bcm2835_spi_reset_hw(struct spi_master *master)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
/* Disable SPI interrupts and transfer */
cs &= ~(BCM2835_SPI_CS_INTR |
BCM2835_SPI_CS_INTD |
BCM2835_SPI_CS_TA);
/* and reset RX/TX FIFOS */
cs |= BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX;
/* and reset the SPI_HW */
bcm2835_wr(bs, BCM2835_SPI_CS, cs);
}
static irqreturn_t bcm2835_spi_interrupt(int irq, void *dev_id)
{
struct spi_master *master = dev_id;
struct bcm2835_spi *bs = spi_master_get_devdata(master);
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
/*
* RXR - RX needs Reading. This means 12 (or more) bytes have been
* transmitted and hence 12 (or more) bytes have been received.
*
* The FIFO is 16-bytes deep. We check for this interrupt to keep the
* FIFO full; we have a 4-byte-time buffer for IRQ latency. We check
* this before DONE (TX empty) just in case we delayed processing this
* interrupt for some reason.
*
* We only check for this case if we have more bytes to TX; at the end
* of the transfer, we ignore this pipelining optimization, and let
* bcm2835_spi_finish_transfer() drain the RX FIFO.
*/
if (bs->len && (cs & BCM2835_SPI_CS_RXR)) {
/* Read 12 bytes of data */
bcm2835_rd_fifo(bs, 12);
/* Read as many bytes as possible from FIFO */
bcm2835_rd_fifo(bs);
/* Write as many bytes as possible to FIFO */
bcm2835_wr_fifo(bs);
/* Write up to 12 bytes */
bcm2835_wr_fifo(bs, 12);
/*
* We must have written something to the TX FIFO due to the
* bs->len check above, so cannot be DONE. Hence, return
* early. Note that DONE could also be set if we serviced an
* RXR interrupt really late.
*/
return IRQ_HANDLED;
/* based on flags decide if we can finish the transfer */
if (bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_DONE) {
/* Transfer complete - reset SPI HW */
bcm2835_spi_reset_hw(master);
/* wake up the framework */
complete(&master->xfer_completion);
}
/*
* DONE - TX empty. This occurs when we first enable the transfer
* since we do not pre-fill the TX FIFO. At any other time, given that
* we refill the TX FIFO above based on RXR, and hence ignore DONE if
* RXR is set, DONE really does mean end-of-transfer.
*/
if (cs & BCM2835_SPI_CS_DONE) {
if (bs->len) { /* First interrupt in a transfer */
bcm2835_wr_fifo(bs, 16);
} else { /* Transfer complete */
/* Disable SPI interrupts */
cs &= ~(BCM2835_SPI_CS_INTR | BCM2835_SPI_CS_INTD);
bcm2835_wr(bs, BCM2835_SPI_CS, cs);
/*
* Wake up bcm2835_spi_transfer_one(), which will call
* bcm2835_spi_finish_transfer(), to drain the RX FIFO.
*/
complete(&bs->done);
}
return IRQ_HANDLED;
}
return IRQ_NONE;
return IRQ_HANDLED;
}
static int bcm2835_spi_start_transfer(struct spi_device *spi,
struct spi_transfer *tfr)
static int bcm2835_spi_transfer_one_poll(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr,
u32 cs,
unsigned long xfer_time_us)
{
struct bcm2835_spi *bs = spi_master_get_devdata(spi->master);
unsigned long spi_hz, clk_hz, cdiv;
u32 cs = BCM2835_SPI_CS_INTR | BCM2835_SPI_CS_INTD | BCM2835_SPI_CS_TA;
struct bcm2835_spi *bs = spi_master_get_devdata(master);
unsigned long timeout = jiffies +
max(4 * xfer_time_us * HZ / 1000000, 2uL);
spi_hz = tfr->speed_hz;
clk_hz = clk_get_rate(bs->clk);
/* enable HW block without interrupts */
bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_TA);
if (spi_hz >= clk_hz / 2) {
cdiv = 2; /* clk_hz/2 is the fastest we can go */
} else if (spi_hz) {
/* CDIV must be a power of two */
cdiv = roundup_pow_of_two(DIV_ROUND_UP(clk_hz, spi_hz));
if (cdiv >= 65536)
cdiv = 0; /* 0 is the slowest we can go */
} else
cdiv = 0; /* 0 is the slowest we can go */
if (spi->mode & SPI_CPOL)
cs |= BCM2835_SPI_CS_CPOL;
if (spi->mode & SPI_CPHA)
cs |= BCM2835_SPI_CS_CPHA;
if (!(spi->mode & SPI_NO_CS)) {
if (spi->mode & SPI_CS_HIGH) {
cs |= BCM2835_SPI_CS_CSPOL;
cs |= BCM2835_SPI_CS_CSPOL0 << spi->chip_select;
/* set timeout to 4x the expected time, or 2 jiffies */
/* loop until finished the transfer */
while (bs->rx_len) {
/* read from fifo as much as possible */
bcm2835_rd_fifo(bs);
/* fill in tx fifo as much as possible */
bcm2835_wr_fifo(bs);
/* if we still expect some data after the read,
* check for a possible timeout
*/
if (bs->rx_len && time_after(jiffies, timeout)) {
/* Transfer complete - reset SPI HW */
bcm2835_spi_reset_hw(master);
/* and return timeout */
return -ETIMEDOUT;
}
cs |= spi->chip_select;
}
reinit_completion(&bs->done);
bs->tx_buf = tfr->tx_buf;
bs->rx_buf = tfr->rx_buf;
bs->len = tfr->len;
/* Transfer complete - reset SPI HW */
bcm2835_spi_reset_hw(master);
/* and return without waiting for completion */
return 0;
}
static int bcm2835_spi_transfer_one_irq(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr,
u32 cs)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
/* fill in fifo if we have gpio-cs
* note that there have been rare events where the native-CS
* flapped for <1us which may change the behaviour
* with gpio-cs this does not happen, so it is implemented
* only for this case
*/
if (gpio_is_valid(spi->cs_gpio)) {
/* enable HW block, but without interrupts enabled
* this would triggern an immediate interrupt
*/
bcm2835_wr(bs, BCM2835_SPI_CS,
cs | BCM2835_SPI_CS_TA);
/* fill in tx fifo as much as possible */
bcm2835_wr_fifo(bs);
}
bcm2835_wr(bs, BCM2835_SPI_CLK, cdiv);
/*
* Enable the HW block. This will immediately trigger a DONE (TX
* empty) interrupt, upon which we will fill the TX FIFO with the
* first TX bytes. Pre-filling the TX FIFO here to avoid the
* interrupt doesn't work:-(
*/
cs |= BCM2835_SPI_CS_INTR | BCM2835_SPI_CS_INTD | BCM2835_SPI_CS_TA;
bcm2835_wr(bs, BCM2835_SPI_CS, cs);
return 0;
}
static int bcm2835_spi_finish_transfer(struct spi_device *spi,
struct spi_transfer *tfr, bool cs_change)
{
struct bcm2835_spi *bs = spi_master_get_devdata(spi->master);
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
/* Drain RX FIFO */
while (cs & BCM2835_SPI_CS_RXD) {
bcm2835_rd_fifo(bs, 1);
cs = bcm2835_rd(bs, BCM2835_SPI_CS);
}
if (tfr->delay_usecs)
udelay(tfr->delay_usecs);
if (cs_change)
/* Clear TA flag */
bcm2835_wr(bs, BCM2835_SPI_CS, cs & ~BCM2835_SPI_CS_TA);
return 0;
/* signal that we need to wait for completion */
return 1;
}
static int bcm2835_spi_transfer_one(struct spi_master *master,
struct spi_message *mesg)
struct spi_device *spi,
struct spi_transfer *tfr)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct spi_transfer *tfr;
struct spi_device *spi = mesg->spi;
int err = 0;
unsigned int timeout;
bool cs_change;
unsigned long spi_hz, clk_hz, cdiv;
unsigned long spi_used_hz, xfer_time_us;
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
list_for_each_entry(tfr, &mesg->transfers, transfer_list) {
err = bcm2835_spi_start_transfer(spi, tfr);
if (err)
goto out;
/* set clock */
spi_hz = tfr->speed_hz;
clk_hz = clk_get_rate(bs->clk);
timeout = wait_for_completion_timeout(&bs->done,
msecs_to_jiffies(BCM2835_SPI_TIMEOUT_MS));
if (!timeout) {
err = -ETIMEDOUT;
goto out;
}
if (spi_hz >= clk_hz / 2) {
cdiv = 2; /* clk_hz/2 is the fastest we can go */
} else if (spi_hz) {
/* CDIV must be a multiple of two */
cdiv = DIV_ROUND_UP(clk_hz, spi_hz);
cdiv += (cdiv % 2);
cs_change = tfr->cs_change ||
list_is_last(&tfr->transfer_list, &mesg->transfers);
if (cdiv >= 65536)
cdiv = 0; /* 0 is the slowest we can go */
} else {
cdiv = 0; /* 0 is the slowest we can go */
}
spi_used_hz = cdiv ? (clk_hz / cdiv) : (clk_hz / 65536);
bcm2835_wr(bs, BCM2835_SPI_CLK, cdiv);
err = bcm2835_spi_finish_transfer(spi, tfr, cs_change);
if (err)
goto out;
/* handle all the modes */
if ((spi->mode & SPI_3WIRE) && (tfr->rx_buf))
cs |= BCM2835_SPI_CS_REN;
if (spi->mode & SPI_CPOL)
cs |= BCM2835_SPI_CS_CPOL;
if (spi->mode & SPI_CPHA)
cs |= BCM2835_SPI_CS_CPHA;
mesg->actual_length += (tfr->len - bs->len);
/* for gpio_cs set dummy CS so that no HW-CS get changed
* we can not run this in bcm2835_spi_set_cs, as it does
* not get called for cs_gpio cases, so we need to do it here
*/
if (gpio_is_valid(spi->cs_gpio) || (spi->mode & SPI_NO_CS))
cs |= BCM2835_SPI_CS_CS_10 | BCM2835_SPI_CS_CS_01;
/* set transmit buffers and length */
bs->tx_buf = tfr->tx_buf;
bs->rx_buf = tfr->rx_buf;
bs->tx_len = tfr->len;
bs->rx_len = tfr->len;
/* calculate the estimated time in us the transfer runs */
xfer_time_us = tfr->len
* 9 /* clocks/byte - SPI-HW waits 1 clock after each byte */
* 1000000 / spi_used_hz;
/* for short requests run polling*/
if (xfer_time_us <= BCM2835_SPI_POLLING_LIMIT_US)
return bcm2835_spi_transfer_one_poll(master, spi, tfr,
cs, xfer_time_us);
return bcm2835_spi_transfer_one_irq(master, spi, tfr, cs);
}
static void bcm2835_spi_handle_err(struct spi_master *master,
struct spi_message *msg)
{
bcm2835_spi_reset_hw(master);
}
static void bcm2835_spi_set_cs(struct spi_device *spi, bool gpio_level)
{
/*
* we can assume that we are "native" as per spi_set_cs
* calling us ONLY when cs_gpio is not set
* we can also assume that we are CS < 3 as per bcm2835_spi_setup
* we would not get called because of error handling there.
* the level passed is the electrical level not enabled/disabled
* so it has to get translated back to enable/disable
* see spi_set_cs in spi.c for the implementation
*/
struct spi_master *master = spi->master;
struct bcm2835_spi *bs = spi_master_get_devdata(master);
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
bool enable;
/* calculate the enable flag from the passed gpio_level */
enable = (spi->mode & SPI_CS_HIGH) ? gpio_level : !gpio_level;
/* set flags for "reverse" polarity in the registers */
if (spi->mode & SPI_CS_HIGH) {
/* set the correct CS-bits */
cs |= BCM2835_SPI_CS_CSPOL;
cs |= BCM2835_SPI_CS_CSPOL0 << spi->chip_select;
} else {
/* clean the CS-bits */
cs &= ~BCM2835_SPI_CS_CSPOL;
cs &= ~(BCM2835_SPI_CS_CSPOL0 << spi->chip_select);
}
out:
/* Clear FIFOs, and disable the HW block */
bcm2835_wr(bs, BCM2835_SPI_CS,
BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX);
mesg->status = err;
spi_finalize_current_message(master);
/* select the correct chip_select depending on disabled/enabled */
if (enable) {
/* set cs correctly */
if (spi->mode & SPI_NO_CS) {
/* use the "undefined" chip-select */
cs |= BCM2835_SPI_CS_CS_10 | BCM2835_SPI_CS_CS_01;
} else {
/* set the chip select */
cs &= ~(BCM2835_SPI_CS_CS_10 | BCM2835_SPI_CS_CS_01);
cs |= spi->chip_select;
}
} else {
/* disable CSPOL which puts HW-CS into deselected state */
cs &= ~BCM2835_SPI_CS_CSPOL;
/* use the "undefined" chip-select as precaution */
cs |= BCM2835_SPI_CS_CS_10 | BCM2835_SPI_CS_CS_01;
}
/* finally set the calculated flags in SPI_CS */
bcm2835_wr(bs, BCM2835_SPI_CS, cs);
}
static int chip_match_name(struct gpio_chip *chip, void *data)
{
return !strcmp(chip->label, data);
}
static int bcm2835_spi_setup(struct spi_device *spi)
{
int err;
struct gpio_chip *chip;
/*
* sanity checking the native-chipselects
*/
if (spi->mode & SPI_NO_CS)
return 0;
if (gpio_is_valid(spi->cs_gpio))
return 0;
if (spi->chip_select > 1) {
/* error in the case of native CS requested with CS > 1
* officially there is a CS2, but it is not documented
* which GPIO is connected with that...
*/
dev_err(&spi->dev,
"setup: only two native chip-selects are supported\n");
return -EINVAL;
}
/* now translate native cs to GPIO */
/* get the gpio chip for the base */
chip = gpiochip_find("pinctrl-bcm2835", chip_match_name);
if (!chip)
return 0;
/* and calculate the real CS */
spi->cs_gpio = chip->base + 8 - spi->chip_select;
/* and set up the "mode" and level */
dev_info(&spi->dev, "setting up native-CS%i as GPIO %i\n",
spi->chip_select, spi->cs_gpio);
/* set up GPIO as output and pull to the correct level */
err = gpio_direction_output(spi->cs_gpio,
(spi->mode & SPI_CS_HIGH) ? 0 : 1);
if (err) {
dev_err(&spi->dev,
"could not set CS%i gpio %i as output: %i",
spi->chip_select, spi->cs_gpio, err);
return err;
}
/* the implementation of pinctrl-bcm2835 currently does not
* set the GPIO value when using gpio_direction_output
* so we are setting it here explicitly
*/
gpio_set_value(spi->cs_gpio, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
return 0;
}
@ -312,13 +426,14 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
master->mode_bits = BCM2835_SPI_MODE_BITS;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->num_chipselect = 3;
master->transfer_one_message = bcm2835_spi_transfer_one;
master->setup = bcm2835_spi_setup;
master->set_cs = bcm2835_spi_set_cs;
master->transfer_one = bcm2835_spi_transfer_one;
master->handle_err = bcm2835_spi_handle_err;
master->dev.of_node = pdev->dev.of_node;
bs = spi_master_get_devdata(master);
init_completion(&bs->done);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
bs->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(bs->regs)) {
@ -343,13 +458,13 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
clk_prepare_enable(bs->clk);
err = devm_request_irq(&pdev->dev, bs->irq, bcm2835_spi_interrupt, 0,
dev_name(&pdev->dev), master);
dev_name(&pdev->dev), master);
if (err) {
dev_err(&pdev->dev, "could not request IRQ: %d\n", err);
goto out_clk_disable;
}
/* initialise the hardware */
/* initialise the hardware with the default polarities */
bcm2835_wr(bs, BCM2835_SPI_CS,
BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX);

4
drivers/spi/spi-bcm53xx.c
View File

@ -44,7 +44,7 @@ static int bcm53xxspi_wait(struct bcm53xxspi *b53spi, unsigned int timeout_ms)
u32 tmp;
/* SPE bit has to be 0 before we read MSPI STATUS */
deadline = jiffies + BCM53XXSPI_SPE_TIMEOUT_MS * HZ / 1000;
deadline = jiffies + msecs_to_jiffies(BCM53XXSPI_SPE_TIMEOUT_MS);
do {
tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_SPCR2);
if (!(tmp & B53SPI_MSPI_SPCR2_SPE))
@ -56,7 +56,7 @@ static int bcm53xxspi_wait(struct bcm53xxspi *b53spi, unsigned int timeout_ms)
goto spi_timeout;
/* Check status */
deadline = jiffies + timeout_ms * HZ / 1000;
deadline = jiffies + msecs_to_jiffies(timeout_ms);
do {
tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_MSPI_STATUS);
if (tmp & B53SPI_MSPI_MSPI_STATUS_SPIF) {

3
drivers/spi/spi-bfin5xx.c
View File

@ -559,7 +559,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
struct spi_transfer *previous = NULL;
struct bfin_spi_slave_data *chip = NULL;
unsigned int bits_per_word;
u16 cr, cr_width, dma_width, dma_config;
u16 cr, cr_width = 0, dma_width, dma_config;
u32 tranf_success = 1;
u8 full_duplex = 0;
@ -648,7 +648,6 @@ static void bfin_spi_pump_transfers(unsigned long data)
} else if (bits_per_word == 8) {
drv_data->n_bytes = bits_per_word/8;
drv_data->len = transfer->len;
cr_width = 0;
drv_data->ops = &bfin_bfin_spi_transfer_ops_u8;
}
cr = bfin_read(&drv_data->regs->ctl) & ~(BIT_CTL_TIMOD | BIT_CTL_WORDSIZE);

18
drivers/spi/spi-bitbang-txrx.h
View File

@ -49,12 +49,17 @@ bitbang_txrx_be_cpha0(struct spi_device *spi,
{
/* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */
bool oldbit = !(word & 1);
/* clock starts at inactive polarity */
for (word <<= (32 - bits); likely(bits); bits--) {
/* setup MSB (to slave) on trailing edge */
if ((flags & SPI_MASTER_NO_TX) == 0)
setmosi(spi, word & (1 << 31));
if ((flags & SPI_MASTER_NO_TX) == 0) {
if ((word & (1 << 31)) != oldbit) {
setmosi(spi, word & (1 << 31));
oldbit = word & (1 << 31);
}
}
spidelay(nsecs); /* T(setup) */
setsck(spi, !cpol);
@ -76,13 +81,18 @@ bitbang_txrx_be_cpha1(struct spi_device *spi,
{
/* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */
bool oldbit = !(word & (1 << 31));
/* clock starts at inactive polarity */
for (word <<= (32 - bits); likely(bits); bits--) {
/* setup MSB (to slave) on leading edge */
setsck(spi, !cpol);
if ((flags & SPI_MASTER_NO_TX) == 0)
setmosi(spi, word & (1 << 31));
if ((flags & SPI_MASTER_NO_TX) == 0) {
if ((word & (1 << 31)) != oldbit) {
setmosi(spi, word & (1 << 31));
oldbit = word & (1 << 31);
}
}
spidelay(nsecs); /* T(setup) */
setsck(spi, cpol);

167
drivers/spi/spi-dw-mid.c
View File

@ -23,29 +23,31 @@
#include "spi-dw.h"
#ifdef CONFIG_SPI_DW_MID_DMA
#include <linux/intel_mid_dma.h>
#include <linux/pci.h>
#include <linux/platform_data/dma-dw.h>
#define RX_BUSY 0
#define TX_BUSY 1
struct mid_dma {
struct intel_mid_dma_slave dmas_tx;
struct intel_mid_dma_slave dmas_rx;
};
static struct dw_dma_slave mid_dma_tx = { .dst_id = 1 };
static struct dw_dma_slave mid_dma_rx = { .src_id = 0 };
static bool mid_spi_dma_chan_filter(struct dma_chan *chan, void *param)
{
struct dw_spi *dws = param;
struct dw_dma_slave *s = param;
return dws->dma_dev == chan->device->dev;
if (s->dma_dev != chan->device->dev)
return false;
chan->private = s;
return true;
}
static int mid_spi_dma_init(struct dw_spi *dws)
{
struct mid_dma *dw_dma = dws->dma_priv;
struct pci_dev *dma_dev;
struct intel_mid_dma_slave *rxs, *txs;
struct dw_dma_slave *tx = dws->dma_tx;
struct dw_dma_slave *rx = dws->dma_rx;
dma_cap_mask_t mask;
/*
@ -56,28 +58,22 @@ static int mid_spi_dma_init(struct dw_spi *dws)
if (!dma_dev)
return -ENODEV;
dws->dma_dev = &dma_dev->dev;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
/* 1. Init rx channel */
dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, dws);
rx->dma_dev = &dma_dev->dev;
dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, rx);
if (!dws->rxchan)
goto err_exit;
rxs = &dw_dma->dmas_rx;
rxs->hs_mode = LNW_DMA_HW_HS;
rxs->cfg_mode = LNW_DMA_PER_TO_MEM;
dws->rxchan->private = rxs;
dws->master->dma_rx = dws->rxchan;
/* 2. Init tx channel */
dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, dws);
tx->dma_dev = &dma_dev->dev;
dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, tx);
if (!dws->txchan)
goto free_rxchan;
txs = &dw_dma->dmas_tx;
txs->hs_mode = LNW_DMA_HW_HS;
txs->cfg_mode = LNW_DMA_MEM_TO_PER;
dws->txchan->private = txs;
dws->master->dma_tx = dws->txchan;
dws->dma_inited = 1;
return 0;
@ -100,6 +96,42 @@ static void mid_spi_dma_exit(struct dw_spi *dws)
dma_release_channel(dws->rxchan);
}
static irqreturn_t dma_transfer(struct dw_spi *dws)
{
u16 irq_status = dw_readl(dws, DW_SPI_ISR);
if (!irq_status)
return IRQ_NONE;
dw_readl(dws, DW_SPI_ICR);
spi_reset_chip(dws);
dev_err(&dws->master->dev, "%s: FIFO overrun/underrun\n", __func__);
dws->master->cur_msg->status = -EIO;
spi_finalize_current_transfer(dws->master);
return IRQ_HANDLED;
}
static bool mid_spi_can_dma(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *xfer)
{
struct dw_spi *dws = spi_master_get_devdata(master);
if (!dws->dma_inited)
return false;
return xfer->len > dws->fifo_len;
}
static enum dma_slave_buswidth convert_dma_width(u32 dma_width) {
if (dma_width == 1)
return DMA_SLAVE_BUSWIDTH_1_BYTE;
else if (dma_width == 2)
return DMA_SLAVE_BUSWIDTH_2_BYTES;
return DMA_SLAVE_BUSWIDTH_UNDEFINED;
}
/*
* dws->dma_chan_busy is set before the dma transfer starts, callback for tx
* channel will clear a corresponding bit.
@ -111,33 +143,30 @@ static void dw_spi_dma_tx_done(void *arg)
clear_bit(TX_BUSY, &dws->dma_chan_busy);
if (test_bit(RX_BUSY, &dws->dma_chan_busy))
return;
dw_spi_xfer_done(dws);
spi_finalize_current_transfer(dws->master);
}
static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws)
static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws,
struct spi_transfer *xfer)
{
struct dma_slave_config txconf;
struct dma_async_tx_descriptor *txdesc;
if (!dws->tx_dma)
if (!xfer->tx_buf)
return NULL;
txconf.direction = DMA_MEM_TO_DEV;
txconf.dst_addr = dws->dma_addr;
txconf.dst_maxburst = LNW_DMA_MSIZE_16;
txconf.dst_maxburst = 16;
txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
txconf.dst_addr_width = dws->dma_width;
txconf.dst_addr_width = convert_dma_width(dws->dma_width);
txconf.device_fc = false;
dmaengine_slave_config(dws->txchan, &txconf);
memset(&dws->tx_sgl, 0, sizeof(dws->tx_sgl));
dws->tx_sgl.dma_address = dws->tx_dma;
dws->tx_sgl.length = dws->len;
txdesc = dmaengine_prep_slave_sg(dws->txchan,
&dws->tx_sgl,
1,
xfer->tx_sg.sgl,
xfer->tx_sg.nents,
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!txdesc)
@ -160,33 +189,30 @@ static void dw_spi_dma_rx_done(void *arg)
clear_bit(RX_BUSY, &dws->dma_chan_busy);
if (test_bit(TX_BUSY, &dws->dma_chan_busy))
return;
dw_spi_xfer_done(dws);
spi_finalize_current_transfer(dws->master);
}
static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws)
static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws,
struct spi_transfer *xfer)
{
struct dma_slave_config rxconf;
struct dma_async_tx_descriptor *rxdesc;
if (!dws->rx_dma)
if (!xfer->rx_buf)
return NULL;
rxconf.direction = DMA_DEV_TO_MEM;
rxconf.src_addr = dws->dma_addr;
rxconf.src_maxburst = LNW_DMA_MSIZE_16;
rxconf.src_maxburst = 16;
rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
rxconf.src_addr_width = dws->dma_width;
rxconf.src_addr_width = convert_dma_width(dws->dma_width);
rxconf.device_fc = false;
dmaengine_slave_config(dws->rxchan, &rxconf);
memset(&dws->rx_sgl, 0, sizeof(dws->rx_sgl));
dws->rx_sgl.dma_address = dws->rx_dma;
dws->rx_sgl.length = dws->len;
rxdesc = dmaengine_prep_slave_sg(dws->rxchan,
&dws->rx_sgl,
1,
xfer->rx_sg.sgl,
xfer->rx_sg.nents,
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!rxdesc)
@ -198,37 +224,36 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws)
return rxdesc;
}
static void dw_spi_dma_setup(struct dw_spi *dws)
static int mid_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer)
{
u16 dma_ctrl = 0;
spi_enable_chip(dws, 0);
dw_writel(dws, DW_SPI_DMARDLR, 0xf);
dw_writel(dws, DW_SPI_DMATDLR, 0x10);
dw_writew(dws, DW_SPI_DMARDLR, 0xf);
dw_writew(dws, DW_SPI_DMATDLR, 0x10);
if (dws->tx_dma)
if (xfer->tx_buf)
dma_ctrl |= SPI_DMA_TDMAE;
if (dws->rx_dma)
if (xfer->rx_buf)
dma_ctrl |= SPI_DMA_RDMAE;
dw_writew(dws, DW_SPI_DMACR, dma_ctrl);
dw_writel(dws, DW_SPI_DMACR, dma_ctrl);
spi_enable_chip(dws, 1);
/* Set the interrupt mask */
spi_umask_intr(dws, SPI_INT_TXOI | SPI_INT_RXUI | SPI_INT_RXOI);
dws->transfer_handler = dma_transfer;
return 0;
}
static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer)
{
struct dma_async_tx_descriptor *txdesc, *rxdesc;
/* 1. setup DMA related registers */
if (cs_change)
dw_spi_dma_setup(dws);
/* Prepare the TX dma transfer */
txdesc = dw_spi_dma_prepare_tx(dws, xfer);
/* 2. Prepare the TX dma transfer */
txdesc = dw_spi_dma_prepare_tx(dws);
/* 3. Prepare the RX dma transfer */
rxdesc = dw_spi_dma_prepare_rx(dws);
/* Prepare the RX dma transfer */
rxdesc = dw_spi_dma_prepare_rx(dws, xfer);
/* rx must be started before tx due to spi instinct */
if (rxdesc) {
@ -246,10 +271,25 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
return 0;
}
static void mid_spi_dma_stop(struct dw_spi *dws)
{
if (test_bit(TX_BUSY, &dws->dma_chan_busy)) {
dmaengine_terminate_all(dws->txchan);
clear_bit(TX_BUSY, &dws->dma_chan_busy);
}
if (test_bit(RX_BUSY, &dws->dma_chan_busy)) {
dmaengine_terminate_all(dws->rxchan);
clear_bit(RX_BUSY, &dws->dma_chan_busy);
}
}
static struct dw_spi_dma_ops mid_dma_ops = {
.dma_init = mid_spi_dma_init,
.dma_exit = mid_spi_dma_exit,
.dma_setup = mid_spi_dma_setup,
.can_dma = mid_spi_can_dma,
.dma_transfer = mid_spi_dma_transfer,
.dma_stop = mid_spi_dma_stop,
};
#endif
@ -282,9 +322,8 @@ int dw_spi_mid_init(struct dw_spi *dws)
iounmap(clk_reg);
#ifdef CONFIG_SPI_DW_MID_DMA
dws->dma_priv = kzalloc(sizeof(struct mid_dma), GFP_KERNEL);
if (!dws->dma_priv)
return -ENOMEM;
dws->dma_tx = &mid_dma_tx;
dws->dma_rx = &mid_dma_rx;
dws->dma_ops = &mid_dma_ops;
#endif
return 0;

306
drivers/spi/spi-dw.c
View File

@ -28,11 +28,6 @@
#include <linux/debugfs.h>
#endif
#define START_STATE ((void *)0)
#define RUNNING_STATE ((void *)1)
#define DONE_STATE ((void *)2)
#define ERROR_STATE ((void *)-1)
/* Slave spi_dev related */
struct chip_data {
u16 cr0;
@ -143,13 +138,26 @@ static inline void dw_spi_debugfs_remove(struct dw_spi *dws)
}
#endif /* CONFIG_DEBUG_FS */
static void dw_spi_set_cs(struct spi_device *spi, bool enable)
{
struct dw_spi *dws = spi_master_get_devdata(spi->master);
struct chip_data *chip = spi_get_ctldata(spi);
/* Chip select logic is inverted from spi_set_cs() */
if (chip && chip->cs_control)
chip->cs_control(!enable);
if (!enable)
dw_writel(dws, DW_SPI_SER, BIT(spi->chip_select));
}
/* Return the max entries we can fill into tx fifo */
static inline u32 tx_max(struct dw_spi *dws)
{
u32 tx_left, tx_room, rxtx_gap;
tx_left = (dws->tx_end - dws->tx) / dws->n_bytes;
tx_room = dws->fifo_len - dw_readw(dws, DW_SPI_TXFLR);
tx_room = dws->fifo_len - dw_readl(dws, DW_SPI_TXFLR);
/*
* Another concern is about the tx/rx mismatch, we
@ -170,7 +178,7 @@ static inline u32 rx_max(struct dw_spi *dws)
{
u32 rx_left = (dws->rx_end - dws->rx) / dws->n_bytes;
return min_t(u32, rx_left, dw_readw(dws, DW_SPI_RXFLR));
return min_t(u32, rx_left, dw_readl(dws, DW_SPI_RXFLR));
}
static void dw_writer(struct dw_spi *dws)
@ -186,7 +194,7 @@ static void dw_writer(struct dw_spi *dws)
else
txw = *(u16 *)(dws->tx);
}
dw_writew(dws, DW_SPI_DR, txw);
dw_writel(dws, DW_SPI_DR, txw);
dws->tx += dws->n_bytes;
}
}
@ -197,7 +205,7 @@ static void dw_reader(struct dw_spi *dws)
u16 rxw;
while (max--) {
rxw = dw_readw(dws, DW_SPI_DR);
rxw = dw_readl(dws, DW_SPI_DR);
/* Care rx only if the transfer's original "rx" is not null */
if (dws->rx_end - dws->len) {
if (dws->n_bytes == 1)
@ -209,103 +217,22 @@ static void dw_reader(struct dw_spi *dws)
}
}
static void *next_transfer(struct dw_spi *dws)
{
struct spi_message *msg = dws->cur_msg;
struct spi_transfer *trans = dws->cur_transfer;
/* Move to next transfer */
if (trans->transfer_list.next != &msg->transfers) {
dws->cur_transfer =
list_entry(trans->transfer_list.next,
struct spi_transfer,
transfer_list);
return RUNNING_STATE;
}
return DONE_STATE;
}
/*
* Note: first step is the protocol driver prepares
* a dma-capable memory, and this func just need translate
* the virt addr to physical
*/
static int map_dma_buffers(struct dw_spi *dws)
{
if (!dws->cur_msg->is_dma_mapped
|| !dws->dma_inited
|| !dws->cur_chip->enable_dma
|| !dws->dma_ops)
return 0;
if (dws->cur_transfer->tx_dma)
dws->tx_dma = dws->cur_transfer->tx_dma;
if (dws->cur_transfer->rx_dma)
dws->rx_dma = dws->cur_transfer->rx_dma;
return 1;
}
/* Caller already set message->status; dma and pio irqs are blocked */
static void giveback(struct dw_spi *dws)
{
struct spi_transfer *last_transfer;
struct spi_message *msg;
msg = dws->cur_msg;
dws->cur_msg = NULL;
dws->cur_transfer = NULL;
dws->prev_chip = dws->cur_chip;
dws->cur_chip = NULL;
dws->dma_mapped = 0;
last_transfer = list_last_entry(&msg->transfers, struct spi_transfer,
transfer_list);
if (!last_transfer->cs_change)
spi_chip_sel(dws, msg->spi, 0);
spi_finalize_current_message(dws->master);
}
static void int_error_stop(struct dw_spi *dws, const char *msg)
{
/* Stop the hw */
spi_enable_chip(dws, 0);
spi_reset_chip(dws);
dev_err(&dws->master->dev, "%s\n", msg);
dws->cur_msg->state = ERROR_STATE;
tasklet_schedule(&dws->pump_transfers);
dws->master->cur_msg->status = -EIO;
spi_finalize_current_transfer(dws->master);
}
void dw_spi_xfer_done(struct dw_spi *dws)
{
/* Update total byte transferred return count actual bytes read */
dws->cur_msg->actual_length += dws->len;
/* Move to next transfer */
dws->cur_msg->state = next_transfer(dws);
/* Handle end of message */
if (dws->cur_msg->state == DONE_STATE) {
dws->cur_msg->status = 0;
giveback(dws);
} else
tasklet_schedule(&dws->pump_transfers);
}
EXPORT_SYMBOL_GPL(dw_spi_xfer_done);
static irqreturn_t interrupt_transfer(struct dw_spi *dws)
{
u16 irq_status = dw_readw(dws, DW_SPI_ISR);
u16 irq_status = dw_readl(dws, DW_SPI_ISR);
/* Error handling */
if (irq_status & (SPI_INT_TXOI | SPI_INT_RXOI | SPI_INT_RXUI)) {
dw_readw(dws, DW_SPI_TXOICR);
dw_readw(dws, DW_SPI_RXOICR);
dw_readw(dws, DW_SPI_RXUICR);
dw_readl(dws, DW_SPI_ICR);
int_error_stop(dws, "interrupt_transfer: fifo overrun/underrun");
return IRQ_HANDLED;
}
@ -313,7 +240,7 @@ static irqreturn_t interrupt_transfer(struct dw_spi *dws)
dw_reader(dws);
if (dws->rx_end == dws->rx) {
spi_mask_intr(dws, SPI_INT_TXEI);
dw_spi_xfer_done(dws);
spi_finalize_current_transfer(dws->master);
return IRQ_HANDLED;
}
if (irq_status & SPI_INT_TXEI) {
@ -328,13 +255,14 @@ static irqreturn_t interrupt_transfer(struct dw_spi *dws)
static irqreturn_t dw_spi_irq(int irq, void *dev_id)
{
struct dw_spi *dws = dev_id;
u16 irq_status = dw_readw(dws, DW_SPI_ISR) & 0x3f;
struct spi_master *master = dev_id;
struct dw_spi *dws = spi_master_get_devdata(master);
u16 irq_status = dw_readl(dws, DW_SPI_ISR) & 0x3f;
if (!irq_status)
return IRQ_NONE;
if (!dws->cur_msg) {
if (!master->cur_msg) {
spi_mask_intr(dws, SPI_INT_TXEI);
return IRQ_HANDLED;
}
@ -343,7 +271,7 @@ static irqreturn_t dw_spi_irq(int irq, void *dev_id)
}
/* Must be called inside pump_transfers() */
static void poll_transfer(struct dw_spi *dws)
static int poll_transfer(struct dw_spi *dws)
{
do {
dw_writer(dws);
@ -351,64 +279,32 @@ static void poll_transfer(struct dw_spi *dws)
cpu_relax();
} while (dws->rx_end > dws->rx);
dw_spi_xfer_done(dws);
return 0;
}
static void pump_transfers(unsigned long data)
static int dw_spi_transfer_one(struct spi_master *master,
struct spi_device *spi, struct spi_transfer *transfer)
{
struct dw_spi *dws = (struct dw_spi *)data;
struct spi_message *message = NULL;
struct spi_transfer *transfer = NULL;
struct spi_transfer *previous = NULL;
struct spi_device *spi = NULL;
struct chip_data *chip = NULL;
u8 bits = 0;
struct dw_spi *dws = spi_master_get_devdata(master);
struct chip_data *chip = spi_get_ctldata(spi);
u8 imask = 0;
u8 cs_change = 0;
u16 txint_level = 0;
u16 txlevel = 0;
u16 clk_div = 0;
u32 speed = 0;
u32 cr0 = 0;
int ret;
/* Get current state information */
message = dws->cur_msg;
transfer = dws->cur_transfer;
chip = dws->cur_chip;
spi = message->spi;
if (message->state == ERROR_STATE) {
message->status = -EIO;
goto early_exit;
}
/* Handle end of message */
if (message->state == DONE_STATE) {
message->status = 0;
goto early_exit;
}
/* Delay if requested at end of transfer */
if (message->state == RUNNING_STATE) {
previous = list_entry(transfer->transfer_list.prev,
struct spi_transfer,
transfer_list);
if (previous->delay_usecs)
udelay(previous->delay_usecs);
}
dws->dma_mapped = 0;
dws->n_bytes = chip->n_bytes;
dws->dma_width = chip->dma_width;
dws->cs_control = chip->cs_control;
dws->rx_dma = transfer->rx_dma;
dws->tx_dma = transfer->tx_dma;
dws->tx = (void *)transfer->tx_buf;
dws->tx_end = dws->tx + transfer->len;
dws->rx = transfer->rx_buf;
dws->rx_end = dws->rx + transfer->len;
dws->len = dws->cur_transfer->len;
if (chip != dws->prev_chip)
cs_change = 1;
dws->len = transfer->len;
spi_enable_chip(dws, 0);
cr0 = chip->cr0;
@ -416,32 +312,37 @@ static void pump_transfers(unsigned long data)
if (transfer->speed_hz) {
speed = chip->speed_hz;
if ((transfer->speed_hz != speed) || (!chip->clk_div)) {
if ((transfer->speed_hz != speed) || !chip->clk_div) {
speed = transfer->speed_hz;
/* clk_div doesn't support odd number */
clk_div = dws->max_freq / speed;
clk_div = (clk_div + 1) & 0xfffe;
clk_div = (dws->max_freq / speed + 1) & 0xfffe;
chip->speed_hz = speed;
chip->clk_div = clk_div;
spi_set_clk(dws, chip->clk_div);
}
}
if (transfer->bits_per_word) {
bits = transfer->bits_per_word;
dws->n_bytes = dws->dma_width = bits >> 3;
cr0 = (bits - 1)
if (transfer->bits_per_word == 8) {
dws->n_bytes = 1;
dws->dma_width = 1;
} else if (transfer->bits_per_word == 16) {
dws->n_bytes = 2;
dws->dma_width = 2;
}
cr0 = (transfer->bits_per_word - 1)
| (chip->type << SPI_FRF_OFFSET)
| (spi->mode << SPI_MODE_OFFSET)
| (chip->tmode << SPI_TMOD_OFFSET);
}
message->state = RUNNING_STATE;
/*
* Adjust transfer mode if necessary. Requires platform dependent
* chipselect mechanism.
*/
if (dws->cs_control) {
if (chip->cs_control) {
if (dws->rx && dws->tx)
chip->tmode = SPI_TMOD_TR;
else if (dws->rx)
@ -453,80 +354,60 @@ static void pump_transfers(unsigned long data)
cr0 |= (chip->tmode << SPI_TMOD_OFFSET);
}
dw_writel(dws, DW_SPI_CTRL0, cr0);
/* Check if current transfer is a DMA transaction */
dws->dma_mapped = map_dma_buffers(dws);
if (master->can_dma && master->can_dma(master, spi, transfer))
dws->dma_mapped = master->cur_msg_mapped;
/* For poll mode just disable all interrupts */
spi_mask_intr(dws, 0xff);
/*
* Interrupt mode
* we only need set the TXEI IRQ, as TX/RX always happen syncronizely
*/
if (!dws->dma_mapped && !chip->poll_mode) {
int templen = dws->len / dws->n_bytes;
txint_level = dws->fifo_len / 2;
txint_level = (templen > txint_level) ? txint_level : templen;
if (dws->dma_mapped) {
ret = dws->dma_ops->dma_setup(dws, transfer);
if (ret < 0) {
spi_enable_chip(dws, 1);
return ret;
}
} else if (!chip->poll_mode) {
txlevel = min_t(u16, dws->fifo_len / 2, dws->len / dws->n_bytes);
dw_writel(dws, DW_SPI_TXFLTR, txlevel);
/* Set the interrupt mask */
imask |= SPI_INT_TXEI | SPI_INT_TXOI |
SPI_INT_RXUI | SPI_INT_RXOI;
spi_umask_intr(dws, imask);
dws->transfer_handler = interrupt_transfer;
}
/*
* Reprogram registers only if
* 1. chip select changes
* 2. clk_div is changed
* 3. control value changes
*/
if (dw_readw(dws, DW_SPI_CTRL0) != cr0 || cs_change || clk_div || imask) {
spi_enable_chip(dws, 0);
spi_enable_chip(dws, 1);
if (dw_readw(dws, DW_SPI_CTRL0) != cr0)
dw_writew(dws, DW_SPI_CTRL0, cr0);
spi_set_clk(dws, clk_div ? clk_div : chip->clk_div);
spi_chip_sel(dws, spi, 1);
/* Set the interrupt mask, for poll mode just disable all int */
spi_mask_intr(dws, 0xff);
if (imask)
spi_umask_intr(dws, imask);
if (txint_level)
dw_writew(dws, DW_SPI_TXFLTR, txint_level);
spi_enable_chip(dws, 1);
if (cs_change)
dws->prev_chip = chip;
if (dws->dma_mapped) {
ret = dws->dma_ops->dma_transfer(dws, transfer);
if (ret < 0)
return ret;
}
if (dws->dma_mapped)
dws->dma_ops->dma_transfer(dws, cs_change);
if (chip->poll_mode)
poll_transfer(dws);
return poll_transfer(dws);
return;
early_exit:
giveback(dws);
return 1;
}
static int dw_spi_transfer_one_message(struct spi_master *master,
static void dw_spi_handle_err(struct spi_master *master,
struct spi_message *msg)
{
struct dw_spi *dws = spi_master_get_devdata(master);
dws->cur_msg = msg;
/* Initial message state */
dws->cur_msg->state = START_STATE;
dws->cur_transfer = list_entry(dws->cur_msg->transfers.next,
struct spi_transfer,
transfer_list);
dws->cur_chip = spi_get_ctldata(dws->cur_msg->spi);
if (dws->dma_mapped)
dws->dma_ops->dma_stop(dws);
/* Launch transfers */
tasklet_schedule(&dws->pump_transfers);
return 0;
spi_reset_chip(dws);
}
/* This may be called twice for each spi dev */
@ -561,8 +442,6 @@ static int dw_spi_setup(struct spi_device *spi)
chip->rx_threshold = 0;
chip->tx_threshold = 0;
chip->enable_dma = chip_info->enable_dma;
}
if (spi->bits_per_word == 8) {
@ -610,9 +489,7 @@ static void dw_spi_cleanup(struct spi_device *spi)
/* Restart the controller, disable all interrupts, clean rx fifo */
static void spi_hw_init(struct device *dev, struct dw_spi *dws)
{
spi_enable_chip(dws, 0);
spi_mask_intr(dws, 0xff);
spi_enable_chip(dws, 1);
spi_reset_chip(dws);
/*
* Try to detect the FIFO depth if not set by interface driver,
@ -622,11 +499,11 @@ static void spi_hw_init(struct device *dev, struct dw_spi *dws)
u32 fifo;
for (fifo = 1; fifo < 256; fifo++) {
dw_writew(dws, DW_SPI_TXFLTR, fifo);
if (fifo != dw_readw(dws, DW_SPI_TXFLTR))
dw_writel(dws, DW_SPI_TXFLTR, fifo);
if (fifo != dw_readl(dws, DW_SPI_TXFLTR))
break;
}
dw_writew(dws, DW_SPI_TXFLTR, 0);
dw_writel(dws, DW_SPI_TXFLTR, 0);
dws->fifo_len = (fifo == 1) ? 0 : fifo;
dev_dbg(dev, "Detected FIFO size: %u bytes\n", dws->fifo_len);
@ -646,13 +523,12 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
dws->master = master;
dws->type = SSI_MOTO_SPI;
dws->prev_chip = NULL;
dws->dma_inited = 0;
dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60);
snprintf(dws->name, sizeof(dws->name), "dw_spi%d", dws->bus_num);
ret = devm_request_irq(dev, dws->irq, dw_spi_irq, IRQF_SHARED,
dws->name, dws);
dws->name, master);
if (ret < 0) {
dev_err(&master->dev, "can not get IRQ\n");
goto err_free_master;
@ -664,7 +540,9 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
master->num_chipselect = dws->num_cs;
master->setup = dw_spi_setup;
master->cleanup = dw_spi_cleanup;
master->transfer_one_message = dw_spi_transfer_one_message;
master->set_cs = dw_spi_set_cs;
master->transfer_one = dw_spi_transfer_one;
master->handle_err = dw_spi_handle_err;
master->max_speed_hz = dws->max_freq;
master->dev.of_node = dev->of_node;
@ -676,11 +554,11 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
if (ret) {
dev_warn(dev, "DMA init failed\n");
dws->dma_inited = 0;
} else {
master->can_dma = dws->dma_ops->can_dma;
}
}
tasklet_init(&dws->pump_transfers, pump_transfers, (unsigned long)dws);
spi_master_set_devdata(master, dws);
ret = devm_spi_register_master(dev, master);
if (ret) {

70
drivers/spi/spi-dw.h
View File

@ -91,12 +91,15 @@ struct dw_spi;
struct dw_spi_dma_ops {
int (*dma_init)(struct dw_spi *dws);
void (*dma_exit)(struct dw_spi *dws);
int (*dma_transfer)(struct dw_spi *dws, int cs_change);
int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer);
bool (*can_dma)(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *xfer);
int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer);
void (*dma_stop)(struct dw_spi *dws);
};
struct dw_spi {
struct spi_master *master;
struct spi_device *cur_dev;
enum dw_ssi_type type;
char name[16];
@ -109,41 +112,26 @@ struct dw_spi {
u16 bus_num;
u16 num_cs; /* supported slave numbers */
/* Message Transfer pump */
struct tasklet_struct pump_transfers;
/* Current message transfer state info */
struct spi_message *cur_msg;
struct spi_transfer *cur_transfer;
struct chip_data *cur_chip;
struct chip_data *prev_chip;
size_t len;
void *tx;
void *tx_end;
void *rx;
void *rx_end;
int dma_mapped;
dma_addr_t rx_dma;
dma_addr_t tx_dma;
size_t rx_map_len;
size_t tx_map_len;
u8 n_bytes; /* current is a 1/2 bytes op */
u8 max_bits_per_word; /* maxim is 16b */
u32 dma_width;
irqreturn_t (*transfer_handler)(struct dw_spi *dws);
void (*cs_control)(u32 command);
/* Dma info */
/* DMA info */
int dma_inited;
struct dma_chan *txchan;
struct scatterlist tx_sgl;
struct dma_chan *rxchan;
struct scatterlist rx_sgl;
unsigned long dma_chan_busy;
struct device *dma_dev;
dma_addr_t dma_addr; /* phy address of the Data register */
struct dw_spi_dma_ops *dma_ops;
void *dma_priv; /* platform relate info */
void *dma_tx;
void *dma_rx;
/* Bus interface info */
void *priv;
@ -162,16 +150,6 @@ static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val)
__raw_writel(val, dws->regs + offset);
}
static inline u16 dw_readw(struct dw_spi *dws, u32 offset)
{
return __raw_readw(dws->regs + offset);
}
static inline void dw_writew(struct dw_spi *dws, u32 offset, u16 val)
{
__raw_writew(val, dws->regs + offset);
}
static inline void spi_enable_chip(struct dw_spi *dws, int enable)
{
dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0));
@ -182,22 +160,6 @@ static inline void spi_set_clk(struct dw_spi *dws, u16 div)
dw_writel(dws, DW_SPI_BAUDR, div);
}
static inline void spi_chip_sel(struct dw_spi *dws, struct spi_device *spi,
int active)
{
u16 cs = spi->chip_select;
int gpio_val = active ? (spi->mode & SPI_CS_HIGH) :
!(spi->mode & SPI_CS_HIGH);
if (dws->cs_control)
dws->cs_control(active);
if (gpio_is_valid(spi->cs_gpio))
gpio_set_value(spi->cs_gpio, gpio_val);
if (active)
dw_writel(dws, DW_SPI_SER, 1 << cs);
}
/* Disable IRQ bits */
static inline void spi_mask_intr(struct dw_spi *dws, u32 mask)
{
@ -216,16 +178,27 @@ static inline void spi_umask_intr(struct dw_spi *dws, u32 mask)
dw_writel(dws, DW_SPI_IMR, new_mask);
}
/*
* This does disable the SPI controller, interrupts, and re-enable the
* controller back. Transmit and receive FIFO buffers are cleared when the
* device is disabled.
*/
static inline void spi_reset_chip(struct dw_spi *dws)
{
spi_enable_chip(dws, 0);
spi_mask_intr(dws, 0xff);
spi_enable_chip(dws, 1);
}
/*
* Each SPI slave device to work with dw_api controller should
* has such a structure claiming its working mode (PIO/DMA etc),
* has such a structure claiming its working mode (poll or PIO/DMA),
* which can be save in the "controller_data" member of the
* struct spi_device.
*/
struct dw_spi_chip {
u8 poll_mode; /* 1 for controller polling mode */
u8 type; /* SPI/SSP/MicroWire */
u8 enable_dma;
void (*cs_control)(u32 command);
};
@ -233,7 +206,6 @@ extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws);
extern void dw_spi_remove_host(struct dw_spi *dws);
extern int dw_spi_suspend_host(struct dw_spi *dws);
extern int dw_spi_resume_host(struct dw_spi *dws);
extern void dw_spi_xfer_done(struct dw_spi *dws);
/* platform related setup */
extern int dw_spi_mid_init(struct dw_spi *dws); /* Intel MID platforms */

97
drivers/spi/spi-fsl-dspi.c
View File

@ -20,6 +20,7 @@
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
@ -29,6 +30,7 @@
#include <linux/sched.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/time.h>
#define DRIVER_NAME "fsl-dspi"
@ -51,7 +53,7 @@
#define SPI_CTAR_CPOL(x) ((x) << 26)
#define SPI_CTAR_CPHA(x) ((x) << 25)
#define SPI_CTAR_LSBFE(x) ((x) << 24)
#define SPI_CTAR_PCSSCR(x) (((x) & 0x00000003) << 22)
#define SPI_CTAR_PCSSCK(x) (((x) & 0x00000003) << 22)
#define SPI_CTAR_PASC(x) (((x) & 0x00000003) << 20)
#define SPI_CTAR_PDT(x) (((x) & 0x00000003) << 18)
#define SPI_CTAR_PBR(x) (((x) & 0x00000003) << 16)
@ -59,6 +61,7 @@
#define SPI_CTAR_ASC(x) (((x) & 0x0000000f) << 8)
#define SPI_CTAR_DT(x) (((x) & 0x0000000f) << 4)
#define SPI_CTAR_BR(x) ((x) & 0x0000000f)
#define SPI_CTAR_SCALE_BITS 0xf
#define SPI_CTAR0_SLAVE 0x0c
@ -148,23 +151,66 @@ static void hz_to_spi_baud(char *pbr, char *br, int speed_hz,
16, 32, 64, 128,
256, 512, 1024, 2048,
4096, 8192, 16384, 32768 };
int temp, i = 0, j = 0;
int scale_needed, scale, minscale = INT_MAX;
int i, j;
temp = clkrate / 2 / speed_hz;
scale_needed = clkrate / speed_hz;
if (clkrate % speed_hz)
scale_needed++;
for (i = 0; i < ARRAY_SIZE(pbr_tbl); i++)
for (j = 0; j < ARRAY_SIZE(brs); j++) {
if (pbr_tbl[i] * brs[j] >= temp) {
*pbr = i;
*br = j;
return;
for (i = 0; i < ARRAY_SIZE(brs); i++)
for (j = 0; j < ARRAY_SIZE(pbr_tbl); j++) {
scale = brs[i] * pbr_tbl[j];
if (scale >= scale_needed) {
if (scale < minscale) {
minscale = scale;
*br = i;
*pbr = j;
}
break;
}
}
pr_warn("Can not find valid baud rate,speed_hz is %d,clkrate is %ld\
,we use the max prescaler value.\n", speed_hz, clkrate);
*pbr = ARRAY_SIZE(pbr_tbl) - 1;
*br = ARRAY_SIZE(brs) - 1;
if (minscale == INT_MAX) {
pr_warn("Can not find valid baud rate,speed_hz is %d,clkrate is %ld, we use the max prescaler value.\n",
speed_hz, clkrate);
*pbr = ARRAY_SIZE(pbr_tbl) - 1;
*br = ARRAY_SIZE(brs) - 1;
}
}
static void ns_delay_scale(char *psc, char *sc, int delay_ns,
unsigned long clkrate)
{
int pscale_tbl[4] = {1, 3, 5, 7};
int scale_needed, scale, minscale = INT_MAX;
int i, j;
u32 remainder;
scale_needed = div_u64_rem((u64)delay_ns * clkrate, NSEC_PER_SEC,
&remainder);
if (remainder)
scale_needed++;
for (i = 0; i < ARRAY_SIZE(pscale_tbl); i++)
for (j = 0; j <= SPI_CTAR_SCALE_BITS; j++) {
scale = pscale_tbl[i] * (2 << j);
if (scale >= scale_needed) {
if (scale < minscale) {
minscale = scale;
*psc = i;
*sc = j;
}
break;
}
}
if (minscale == INT_MAX) {
pr_warn("Cannot find correct scale values for %dns delay at clkrate %ld, using max prescaler value",
delay_ns, clkrate);
*psc = ARRAY_SIZE(pscale_tbl) - 1;
*sc = SPI_CTAR_SCALE_BITS;
}
}
static int dspi_transfer_write(struct fsl_dspi *dspi)
@ -345,7 +391,10 @@ static int dspi_setup(struct spi_device *spi)
{
struct chip_data *chip;
struct fsl_dspi *dspi = spi_master_get_devdata(spi->master);
unsigned char br = 0, pbr = 0, fmsz = 0;
u32 cs_sck_delay = 0, sck_cs_delay = 0;
unsigned char br = 0, pbr = 0, pcssck = 0, cssck = 0;
unsigned char pasc = 0, asc = 0, fmsz = 0;
unsigned long clkrate;
if ((spi->bits_per_word >= 4) && (spi->bits_per_word <= 16)) {
fmsz = spi->bits_per_word - 1;
@ -362,18 +411,34 @@ static int dspi_setup(struct spi_device *spi)
return -ENOMEM;
}
of_property_read_u32(spi->dev.of_node, "fsl,spi-cs-sck-delay",
&cs_sck_delay);
of_property_read_u32(spi->dev.of_node, "fsl,spi-sck-cs-delay",
&sck_cs_delay);
chip->mcr_val = SPI_MCR_MASTER | SPI_MCR_PCSIS |
SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF;
chip->void_write_data = 0;
hz_to_spi_baud(&pbr, &br,
spi->max_speed_hz, clk_get_rate(dspi->clk));
clkrate = clk_get_rate(dspi->clk);
hz_to_spi_baud(&pbr, &br, spi->max_speed_hz, clkrate);
/* Set PCS to SCK delay scale values */
ns_delay_scale(&pcssck, &cssck, cs_sck_delay, clkrate);
/* Set After SCK delay scale values */
ns_delay_scale(&pasc, &asc, sck_cs_delay, clkrate);
chip->ctar_val = SPI_CTAR_FMSZ(fmsz)
| SPI_CTAR_CPOL(spi->mode & SPI_CPOL ? 1 : 0)
| SPI_CTAR_CPHA(spi->mode & SPI_CPHA ? 1 : 0)
| SPI_CTAR_LSBFE(spi->mode & SPI_LSB_FIRST ? 1 : 0)
| SPI_CTAR_PCSSCK(pcssck)
| SPI_CTAR_CSSCK(cssck)
| SPI_CTAR_PASC(pasc)
| SPI_CTAR_ASC(asc)
| SPI_CTAR_PBR(pbr)
| SPI_CTAR_BR(br);

193
drivers/spi/spi-img-spfi.c
View File

@ -12,6 +12,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
@ -122,36 +123,31 @@ static inline void spfi_start(struct img_spfi *spfi)
spfi_writel(spfi, val, SPFI_CONTROL);
}
static inline void spfi_stop(struct img_spfi *spfi)
{
u32 val;
val = spfi_readl(spfi, SPFI_CONTROL);
val &= ~SPFI_CONTROL_SPFI_EN;
spfi_writel(spfi, val, SPFI_CONTROL);
}
static inline void spfi_reset(struct img_spfi *spfi)
{
spfi_writel(spfi, SPFI_CONTROL_SOFT_RESET, SPFI_CONTROL);
udelay(1);
spfi_writel(spfi, 0, SPFI_CONTROL);
}
static void spfi_flush_tx_fifo(struct img_spfi *spfi)
static int spfi_wait_all_done(struct img_spfi *spfi)
{
unsigned long timeout = jiffies + msecs_to_jiffies(10);
unsigned long timeout = jiffies + msecs_to_jiffies(50);
spfi_writel(spfi, SPFI_INTERRUPT_SDE, SPFI_INTERRUPT_CLEAR);
while (time_before(jiffies, timeout)) {
if (spfi_readl(spfi, SPFI_INTERRUPT_STATUS) &
SPFI_INTERRUPT_SDE)
return;
u32 status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS);
if (status & SPFI_INTERRUPT_ALLDONETRIG) {
spfi_writel(spfi, SPFI_INTERRUPT_ALLDONETRIG,
SPFI_INTERRUPT_CLEAR);
return 0;
}
cpu_relax();
}
dev_err(spfi->dev, "Timed out waiting for FIFO to drain\n");
dev_err(spfi->dev, "Timed out waiting for transaction to complete\n");
spfi_reset(spfi);
return -ETIMEDOUT;
}
static unsigned int spfi_pio_write32(struct img_spfi *spfi, const u32 *buf,
@ -237,6 +233,7 @@ static int img_spfi_start_pio(struct spi_master *master,
const void *tx_buf = xfer->tx_buf;
void *rx_buf = xfer->rx_buf;
unsigned long timeout;
int ret;
if (tx_buf)
tx_bytes = xfer->len;
@ -269,16 +266,15 @@ static int img_spfi_start_pio(struct spi_master *master,
cpu_relax();
}
ret = spfi_wait_all_done(spfi);
if (ret < 0)
return ret;
if (rx_bytes > 0 || tx_bytes > 0) {
dev_err(spfi->dev, "PIO transfer timed out\n");
spfi_reset(spfi);
return -ETIMEDOUT;
}
if (tx_buf)
spfi_flush_tx_fifo(spfi);
spfi_stop(spfi);
return 0;
}
@ -287,14 +283,12 @@ static void img_spfi_dma_rx_cb(void *data)
struct img_spfi *spfi = data;
unsigned long flags;
spfi_wait_all_done(spfi);
spin_lock_irqsave(&spfi->lock, flags);
spfi->rx_dma_busy = false;
if (!spfi->tx_dma_busy) {
spfi_stop(spfi);
if (!spfi->tx_dma_busy)
spi_finalize_current_transfer(spfi->master);
}
spin_unlock_irqrestore(&spfi->lock, flags);
}
@ -303,16 +297,12 @@ static void img_spfi_dma_tx_cb(void *data)
struct img_spfi *spfi = data;
unsigned long flags;
spfi_flush_tx_fifo(spfi);
spfi_wait_all_done(spfi);
spin_lock_irqsave(&spfi->lock, flags);
spfi->tx_dma_busy = false;
if (!spfi->rx_dma_busy) {
spfi_stop(spfi);
if (!spfi->rx_dma_busy)
spi_finalize_current_transfer(spfi->master);
}
spin_unlock_irqrestore(&spfi->lock, flags);
}
@ -397,6 +387,75 @@ stop_dma:
return -EIO;
}
static void img_spfi_handle_err(struct spi_master *master,
struct spi_message *msg)
{
struct img_spfi *spfi = spi_master_get_devdata(master);
unsigned long flags;
/*
* Stop all DMA and reset the controller if the previous transaction
* timed-out and never completed it's DMA.
*/
spin_lock_irqsave(&spfi->lock, flags);
if (spfi->tx_dma_busy || spfi->rx_dma_busy) {
spfi->tx_dma_busy = false;
spfi->rx_dma_busy = false;
dmaengine_terminate_all(spfi->tx_ch);
dmaengine_terminate_all(spfi->rx_ch);
}
spin_unlock_irqrestore(&spfi->lock, flags);
}
static int img_spfi_prepare(struct spi_master *master, struct spi_message *msg)
{
struct img_spfi *spfi = spi_master_get_devdata(master);
u32 val;
val = spfi_readl(spfi, SPFI_PORT_STATE);
if (msg->spi->mode & SPI_CPHA)
val |= SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select);
else
val &= ~SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select);
if (msg->spi->mode & SPI_CPOL)
val |= SPFI_PORT_STATE_CK_POL(msg->spi->chip_select);
else
val &= ~SPFI_PORT_STATE_CK_POL(msg->spi->chip_select);
spfi_writel(spfi, val, SPFI_PORT_STATE);
return 0;
}
static int img_spfi_unprepare(struct spi_master *master,
struct spi_message *msg)
{
struct img_spfi *spfi = spi_master_get_devdata(master);
spfi_reset(spfi);
return 0;
}
static int img_spfi_setup(struct spi_device *spi)
{
int ret;
ret = gpio_request_one(spi->cs_gpio, (spi->mode & SPI_CS_HIGH) ?
GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
dev_name(&spi->dev));
if (ret)
dev_err(&spi->dev, "can't request chipselect gpio %d\n",
spi->cs_gpio);
return ret;
}
static void img_spfi_cleanup(struct spi_device *spi)
{
gpio_free(spi->cs_gpio);
}
static void img_spfi_config(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *xfer)
{
@ -405,10 +464,10 @@ static void img_spfi_config(struct spi_master *master, struct spi_device *spi,
/*
* output = spfi_clk * (BITCLK / 512), where BITCLK must be a
* power of 2 up to 256 (where 255 == 256 since BITCLK is 8 bits)
* power of 2 up to 128
*/
div = DIV_ROUND_UP(master->max_speed_hz, xfer->speed_hz);
div = clamp(512 / (1 << get_count_order(div)), 1, 255);
div = DIV_ROUND_UP(clk_get_rate(spfi->spfi_clk), xfer->speed_hz);
div = clamp(512 / (1 << get_count_order(div)), 1, 128);
val = spfi_readl(spfi, SPFI_DEVICE_PARAMETER(spi->chip_select));
val &= ~(SPFI_DEVICE_PARAMETER_BITCLK_MASK <<
@ -416,6 +475,9 @@ static void img_spfi_config(struct spi_master *master, struct spi_device *spi,
val |= div << SPFI_DEVICE_PARAMETER_BITCLK_SHIFT;
spfi_writel(spfi, val, SPFI_DEVICE_PARAMETER(spi->chip_select));
spfi_writel(spfi, xfer->len << SPFI_TRANSACTION_TSIZE_SHIFT,
SPFI_TRANSACTION);
val = spfi_readl(spfi, SPFI_CONTROL);
val &= ~(SPFI_CONTROL_SEND_DMA | SPFI_CONTROL_GET_DMA);
if (xfer->tx_buf)
@ -429,25 +491,7 @@ static void img_spfi_config(struct spi_master *master, struct spi_device *spi,
else if (xfer->tx_nbits == SPI_NBITS_QUAD &&
xfer->rx_nbits == SPI_NBITS_QUAD)
val |= SPFI_CONTROL_TMODE_QUAD << SPFI_CONTROL_TMODE_SHIFT;
val &= ~SPFI_CONTROL_CONTINUE;
if (!xfer->cs_change && !list_is_last(&xfer->transfer_list,
&master->cur_msg->transfers))
val |= SPFI_CONTROL_CONTINUE;
spfi_writel(spfi, val, SPFI_CONTROL);
val = spfi_readl(spfi, SPFI_PORT_STATE);
if (spi->mode & SPI_CPHA)
val |= SPFI_PORT_STATE_CK_PHASE(spi->chip_select);
else
val &= ~SPFI_PORT_STATE_CK_PHASE(spi->chip_select);
if (spi->mode & SPI_CPOL)
val |= SPFI_PORT_STATE_CK_POL(spi->chip_select);
else
val &= ~SPFI_PORT_STATE_CK_POL(spi->chip_select);
spfi_writel(spfi, val, SPFI_PORT_STATE);
spfi_writel(spfi, xfer->len << SPFI_TRANSACTION_TSIZE_SHIFT,
SPFI_TRANSACTION);
}
static int img_spfi_transfer_one(struct spi_master *master,
@ -455,8 +499,6 @@ static int img_spfi_transfer_one(struct spi_master *master,
struct spi_transfer *xfer)
{
struct img_spfi *spfi = spi_master_get_devdata(spi->master);
bool dma_reset = false;
unsigned long flags;
int ret;
if (xfer->len > SPFI_TRANSACTION_TSIZE_MASK) {
@ -466,23 +508,6 @@ static int img_spfi_transfer_one(struct spi_master *master,
return -EINVAL;
}
/*
* Stop all DMA and reset the controller if the previous transaction
* timed-out and never completed it's DMA.
*/
spin_lock_irqsave(&spfi->lock, flags);
if (spfi->tx_dma_busy || spfi->rx_dma_busy) {
dev_err(spfi->dev, "SPI DMA still busy\n");
dma_reset = true;
}
spin_unlock_irqrestore(&spfi->lock, flags);
if (dma_reset) {
dmaengine_terminate_all(spfi->tx_ch);
dmaengine_terminate_all(spfi->rx_ch);
spfi_reset(spfi);
}
img_spfi_config(master, spi, xfer);
if (master->can_dma && master->can_dma(master, spi, xfer))
ret = img_spfi_start_dma(master, spi, xfer);
@ -492,17 +517,6 @@ static int img_spfi_transfer_one(struct spi_master *master,
return ret;
}
static void img_spfi_set_cs(struct spi_device *spi, bool enable)
{
struct img_spfi *spfi = spi_master_get_devdata(spi->master);
u32 val;
val = spfi_readl(spfi, SPFI_PORT_STATE);
val &= ~(SPFI_PORT_STATE_DEV_SEL_MASK << SPFI_PORT_STATE_DEV_SEL_SHIFT);
val |= spi->chip_select << SPFI_PORT_STATE_DEV_SEL_SHIFT;
spfi_writel(spfi, val, SPFI_PORT_STATE);
}
static bool img_spfi_can_dma(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *xfer)
{
@ -591,14 +605,17 @@ static int img_spfi_probe(struct platform_device *pdev)
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_DUAL | SPI_RX_DUAL;
if (of_property_read_bool(spfi->dev->of_node, "img,supports-quad-mode"))
master->mode_bits |= SPI_TX_QUAD | SPI_RX_QUAD;
master->num_chipselect = 5;
master->dev.of_node = pdev->dev.of_node;
master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(8);
master->max_speed_hz = clk_get_rate(spfi->spfi_clk);
master->min_speed_hz = master->max_speed_hz / 512;
master->max_speed_hz = clk_get_rate(spfi->spfi_clk) / 4;
master->min_speed_hz = clk_get_rate(spfi->spfi_clk) / 512;
master->set_cs = img_spfi_set_cs;
master->setup = img_spfi_setup;
master->cleanup = img_spfi_cleanup;
master->transfer_one = img_spfi_transfer_one;
master->prepare_message = img_spfi_prepare;
master->unprepare_message = img_spfi_unprepare;
master->handle_err = img_spfi_handle_err;
spfi->tx_ch = dma_request_slave_channel(spfi->dev, "tx");
spfi->rx_ch = dma_request_slave_channel(spfi->dev, "rx");

8
drivers/spi/spi-imx.c
View File

@ -370,8 +370,6 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
if (spi_imx->dma_is_inited) {
dma = readl(spi_imx->base + MX51_ECSPI_DMA);
spi_imx->tx_wml = spi_imx_get_fifosize(spi_imx) / 2;
spi_imx->rx_wml = spi_imx_get_fifosize(spi_imx) / 2;
spi_imx->rxt_wml = spi_imx_get_fifosize(spi_imx) / 2;
rx_wml_cfg = spi_imx->rx_wml << MX51_ECSPI_DMA_RX_WML_OFFSET;
tx_wml_cfg = spi_imx->tx_wml << MX51_ECSPI_DMA_TX_WML_OFFSET;
@ -868,6 +866,8 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
master->max_dma_len = MAX_SDMA_BD_BYTES;
spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
SPI_MASTER_MUST_TX;
spi_imx->tx_wml = spi_imx_get_fifosize(spi_imx) / 2;
spi_imx->rx_wml = spi_imx_get_fifosize(spi_imx) / 2;
spi_imx->dma_is_inited = 1;
return 0;
@ -903,7 +903,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
if (tx) {
desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
tx->sgl, tx->nents, DMA_TO_DEVICE,
tx->sgl, tx->nents, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_tx)
goto no_dma;
@ -915,7 +915,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
if (rx) {
desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
rx->sgl, rx->nents, DMA_FROM_DEVICE,
rx->sgl, rx->nents, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_rx)
goto no_dma;

2
drivers/spi/spi-mpc512x-psc.c
View File

@ -588,7 +588,7 @@ static int mpc512x_psc_spi_of_remove(struct platform_device *op)
return mpc512x_psc_spi_do_remove(&op->dev);
}
static struct of_device_id mpc512x_psc_spi_of_match[] = {
static const struct of_device_id mpc512x_psc_spi_of_match[] = {
{ .compatible = "fsl,mpc5121-psc-spi", },
{},
};

2
drivers/spi/spi-octeon.c
View File

@ -238,7 +238,7 @@ static int octeon_spi_remove(struct platform_device *pdev)
return 0;
}
static struct of_device_id octeon_spi_match[] = {
static const struct of_device_id octeon_spi_match[] = {
{ .compatible = "cavium,octeon-3010-spi", },
{},
};

101
drivers/spi/spi-omap-100k.c
View File

@ -24,6 +24,7 @@
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
@ -294,16 +295,6 @@ static int omap1_spi100k_setup(struct spi_device *spi)
return ret;
}
static int omap1_spi100k_prepare_hardware(struct spi_master *master)
{
struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
clk_prepare_enable(spi100k->ick);
clk_prepare_enable(spi100k->fck);
return 0;
}
static int omap1_spi100k_transfer_one_message(struct spi_master *master,
struct spi_message *m)
{
@ -372,16 +363,6 @@ static int omap1_spi100k_transfer_one_message(struct spi_master *master,
return status;
}
static int omap1_spi100k_unprepare_hardware(struct spi_master *master)
{
struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
clk_disable_unprepare(spi100k->ick);
clk_disable_unprepare(spi100k->fck);
return 0;
}
static int omap1_spi100k_probe(struct platform_device *pdev)
{
struct spi_master *master;
@ -402,14 +383,12 @@ static int omap1_spi100k_probe(struct platform_device *pdev)
master->setup = omap1_spi100k_setup;
master->transfer_one_message = omap1_spi100k_transfer_one_message;
master->prepare_transfer_hardware = omap1_spi100k_prepare_hardware;
master->unprepare_transfer_hardware = omap1_spi100k_unprepare_hardware;
master->cleanup = NULL;
master->num_chipselect = 2;
master->mode_bits = MODEBITS;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
master->min_speed_hz = OMAP1_SPI100K_MAX_FREQ/(1<<16);
master->max_speed_hz = OMAP1_SPI100K_MAX_FREQ;
master->auto_runtime_pm = true;
spi100k = spi_master_get_devdata(master);
@ -434,22 +413,96 @@ static int omap1_spi100k_probe(struct platform_device *pdev)
goto err;
}
status = clk_prepare_enable(spi100k->ick);
if (status != 0) {
dev_err(&pdev->dev, "failed to enable ick: %d\n", status);
goto err;
}
status = clk_prepare_enable(spi100k->fck);
if (status != 0) {
dev_err(&pdev->dev, "failed to enable fck: %d\n", status);
goto err_ick;
}
pm_runtime_enable(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
status = devm_spi_register_master(&pdev->dev, master);
if (status < 0)
goto err;
goto err_fck;
return status;
err_fck:
clk_disable_unprepare(spi100k->fck);
err_ick:
clk_disable_unprepare(spi100k->ick);
err:
spi_master_put(master);
return status;
}
static int omap1_spi100k_remove(struct platform_device *pdev)
{
struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(spi100k->fck);
clk_disable_unprepare(spi100k->ick);
return 0;
}
#ifdef CONFIG_PM
static int omap1_spi100k_runtime_suspend(struct device *dev)
{
struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
clk_disable_unprepare(spi100k->ick);
clk_disable_unprepare(spi100k->fck);
return 0;
}
static int omap1_spi100k_runtime_resume(struct device *dev)
{
struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
int ret;
ret = clk_prepare_enable(spi100k->ick);
if (ret != 0) {
dev_err(dev, "Failed to enable ick: %d\n", ret);
return ret;
}
ret = clk_prepare_enable(spi100k->fck);
if (ret != 0) {
dev_err(dev, "Failed to enable fck: %d\n", ret);
clk_disable_unprepare(spi100k->ick);
return ret;
}
return 0;
}
#endif
static const struct dev_pm_ops omap1_spi100k_pm = {
SET_RUNTIME_PM_OPS(omap1_spi100k_runtime_suspend,
omap1_spi100k_runtime_resume, NULL)
};
static struct platform_driver omap1_spi100k_driver = {
.driver = {
.name = "omap1_spi100k",
.pm = &omap1_spi100k_pm,
},
.probe = omap1_spi100k_probe,
.remove = omap1_spi100k_remove,
};
module_platform_driver(omap1_spi100k_driver);

1
drivers/spi/spi-omap-uwire.c
View File

@ -44,7 +44,6 @@
#include <linux/module.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>

14
drivers/spi/spi-pl022.c
View File

@ -285,7 +285,12 @@
*/
#define DEFAULT_SSP_REG_IMSC 0x0UL
#define DISABLE_ALL_INTERRUPTS DEFAULT_SSP_REG_IMSC
#define ENABLE_ALL_INTERRUPTS (~DEFAULT_SSP_REG_IMSC)
#define ENABLE_ALL_INTERRUPTS ( \
SSP_IMSC_MASK_RORIM | \
SSP_IMSC_MASK_RTIM | \
SSP_IMSC_MASK_RXIM | \
SSP_IMSC_MASK_TXIM \
)
#define CLEAR_ALL_INTERRUPTS 0x3
@ -1251,7 +1256,6 @@ static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id)
struct pl022 *pl022 = dev_id;
struct spi_message *msg = pl022->cur_msg;
u16 irq_status = 0;
u16 flag = 0;
if (unlikely(!msg)) {
dev_err(&pl022->adev->dev,
@ -1280,9 +1284,6 @@ static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id)
if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RFF)
dev_err(&pl022->adev->dev,
"RXFIFO is full\n");
if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_TNF)
dev_err(&pl022->adev->dev,
"TXFIFO is full\n");
/*
* Disable and clear interrupts, disable SSP,
@ -1303,8 +1304,7 @@ static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id)
readwriter(pl022);
if ((pl022->tx == pl022->tx_end) && (flag == 0)) {
flag = 1;
if (pl022->tx == pl022->tx_end) {
/* Disable Transmit interrupt, enable receive interrupt */
writew((readw(SSP_IMSC(pl022->virtbase)) &
~SSP_IMSC_MASK_TXIM) | SSP_IMSC_MASK_RXIM,

192
drivers/spi/spi-pxa2xx.c
View File

@ -20,6 +20,7 @@
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/spi/spi.h>
@ -30,10 +31,6 @@
#include <linux/pm_runtime.h>
#include <linux/acpi.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/delay.h>
#include "spi-pxa2xx.h"
MODULE_AUTHOR("Stephen Street");
@ -67,54 +64,6 @@ MODULE_ALIAS("platform:pxa2xx-spi");
#define LPSS_TX_LOTHRESH_DFLT 160
#define LPSS_TX_HITHRESH_DFLT 224
struct quark_spi_rate {
u32 bitrate;
u32 dds_clk_rate;
u32 clk_div;
};
/*
* 'rate', 'dds', 'clk_div' lookup table, which is defined in
* the Quark SPI datasheet.
*/
static const struct quark_spi_rate quark_spi_rate_table[] = {
/* bitrate, dds_clk_rate, clk_div */
{50000000, 0x800000, 0},
{40000000, 0x666666, 0},
{25000000, 0x400000, 0},
{20000000, 0x666666, 1},
{16667000, 0x800000, 2},
{13333000, 0x666666, 2},
{12500000, 0x200000, 0},
{10000000, 0x800000, 4},
{8000000, 0x666666, 4},
{6250000, 0x400000, 3},
{5000000, 0x400000, 4},
{4000000, 0x666666, 9},
{3125000, 0x80000, 0},
{2500000, 0x400000, 9},
{2000000, 0x666666, 19},
{1563000, 0x40000, 0},
{1250000, 0x200000, 9},
{1000000, 0x400000, 24},
{800000, 0x666666, 49},
{781250, 0x20000, 0},
{625000, 0x200000, 19},
{500000, 0x400000, 49},
{400000, 0x666666, 99},
{390625, 0x10000, 0},
{250000, 0x400000, 99},
{200000, 0x666666, 199},
{195313, 0x8000, 0},
{125000, 0x100000, 49},
{100000, 0x200000, 124},
{50000, 0x100000, 124},
{25000, 0x80000, 124},
{10016, 0x20000, 77},
{5040, 0x20000, 154},
{1002, 0x8000, 194},
};
/* Offset from drv_data->lpss_base */
#define GENERAL_REG 0x08
#define GENERAL_REG_RXTO_HOLDOFF_DISABLE BIT(24)
@ -701,25 +650,124 @@ static irqreturn_t ssp_int(int irq, void *dev_id)
}
/*
* The Quark SPI data sheet gives a table, and for the given 'rate',
* the 'dds' and 'clk_div' can be found in the table.
* The Quark SPI has an additional 24 bit register (DDS_CLK_RATE) to multiply
* input frequency by fractions of 2^24. It also has a divider by 5.
*
* There are formulas to get baud rate value for given input frequency and
* divider parameters, such as DDS_CLK_RATE and SCR:
*
* Fsys = 200MHz
*
* Fssp = Fsys * DDS_CLK_RATE / 2^24 (1)
* Baud rate = Fsclk = Fssp / (2 * (SCR + 1)) (2)
*
* DDS_CLK_RATE either 2^n or 2^n / 5.
* SCR is in range 0 .. 255
*
* Divisor = 5^i * 2^j * 2 * k
* i = [0, 1] i = 1 iff j = 0 or j > 3
* j = [0, 23] j = 0 iff i = 1
* k = [1, 256]
* Special case: j = 0, i = 1: Divisor = 2 / 5
*
* Accordingly to the specification the recommended values for DDS_CLK_RATE
* are:
* Case 1: 2^n, n = [0, 23]
* Case 2: 2^24 * 2 / 5 (0x666666)
* Case 3: less than or equal to 2^24 / 5 / 16 (0x33333)
*
* In all cases the lowest possible value is better.
*
* The function calculates parameters for all cases and chooses the one closest
* to the asked baud rate.
*/
static u32 quark_x1000_set_clk_regvals(u32 rate, u32 *dds, u32 *clk_div)
static unsigned int quark_x1000_get_clk_div(int rate, u32 *dds)
{
unsigned int i;
unsigned long xtal = 200000000;
unsigned long fref = xtal / 2; /* mandatory division by 2,
see (2) */
/* case 3 */
unsigned long fref1 = fref / 2; /* case 1 */
unsigned long fref2 = fref * 2 / 5; /* case 2 */
unsigned long scale;
unsigned long q, q1, q2;
long r, r1, r2;
u32 mul;
for (i = 0; i < ARRAY_SIZE(quark_spi_rate_table); i++) {
if (rate >= quark_spi_rate_table[i].bitrate) {
*dds = quark_spi_rate_table[i].dds_clk_rate;
*clk_div = quark_spi_rate_table[i].clk_div;
return quark_spi_rate_table[i].bitrate;
/* Case 1 */
/* Set initial value for DDS_CLK_RATE */
mul = (1 << 24) >> 1;
/* Calculate initial quot */
q1 = DIV_ROUND_CLOSEST(fref1, rate);
/* Scale q1 if it's too big */
if (q1 > 256) {
/* Scale q1 to range [1, 512] */
scale = fls_long(q1 - 1);
if (scale > 9) {
q1 >>= scale - 9;
mul >>= scale - 9;
}
/* Round the result if we have a remainder */
q1 += q1 & 1;
}
/* Decrease DDS_CLK_RATE as much as we can without loss in precision */
scale = __ffs(q1);
q1 >>= scale;
mul >>= scale;
/* Get the remainder */
r1 = abs(fref1 / (1 << (24 - fls_long(mul))) / q1 - rate);
/* Case 2 */
q2 = DIV_ROUND_CLOSEST(fref2, rate);
r2 = abs(fref2 / q2 - rate);
/*
* Choose the best between two: less remainder we have the better. We
* can't go case 2 if q2 is greater than 256 since SCR register can
* hold only values 0 .. 255.
*/
if (r2 >= r1 || q2 > 256) {
/* case 1 is better */
r = r1;
q = q1;
} else {
/* case 2 is better */
r = r2;
q = q2;
mul = (1 << 24) * 2 / 5;
}
/* Check case 3 only If the divisor is big enough */
if (fref / rate >= 80) {
u64 fssp;
u32 m;
/* Calculate initial quot */
q1 = DIV_ROUND_CLOSEST(fref, rate);
m = (1 << 24) / q1;
/* Get the remainder */
fssp = (u64)fref * m;
do_div(fssp, 1 << 24);
r1 = abs(fssp - rate);
/* Choose this one if it suits better */
if (r1 < r) {
/* case 3 is better */
q = 1;
mul = m;
}
}
*dds = quark_spi_rate_table[i-1].dds_clk_rate;
*clk_div = quark_spi_rate_table[i-1].clk_div;
return quark_spi_rate_table[i-1].bitrate;
*dds = mul;
return q - 1;
}
static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
@ -730,23 +778,25 @@ static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
rate = min_t(int, ssp_clk, rate);
if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP)
return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8;
return (ssp_clk / (2 * rate) - 1) & 0xff;
else
return ((ssp_clk / rate - 1) & 0xfff) << 8;
return (ssp_clk / rate - 1) & 0xfff;
}
static unsigned int pxa2xx_ssp_get_clk_div(struct driver_data *drv_data,
struct chip_data *chip, int rate)
{
u32 clk_div;
unsigned int clk_div;
switch (drv_data->ssp_type) {
case QUARK_X1000_SSP:
quark_x1000_set_clk_regvals(rate, &chip->dds_rate, &clk_div);
return clk_div << 8;
clk_div = quark_x1000_get_clk_div(rate, &chip->dds_rate);
break;
default:
return ssp_get_clk_div(drv_data, rate);
clk_div = ssp_get_clk_div(drv_data, rate);
break;
}
return clk_div << 8;
}
static void pump_transfers(unsigned long data)

336
drivers/spi/spi-qup.c
View File

@ -22,6 +22,8 @@
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#define QUP_CONFIG 0x0000
#define QUP_STATE 0x0004
@ -116,6 +118,8 @@
#define SPI_NUM_CHIPSELECTS 4
#define SPI_MAX_DMA_XFER (SZ_64K - 64)
/* high speed mode is when bus rate is greater then 26MHz */
#define SPI_HS_MIN_RATE 26000000
#define SPI_MAX_RATE 50000000
@ -140,9 +144,14 @@ struct spi_qup {
struct completion done;
int error;
int w_size; /* bytes per SPI word */
int n_words;
int tx_bytes;
int rx_bytes;
int qup_v1;
int use_dma;
struct dma_slave_config rx_conf;
struct dma_slave_config tx_conf;
};
@ -198,7 +207,6 @@ static int spi_qup_set_state(struct spi_qup *controller, u32 state)
return 0;
}
static void spi_qup_fifo_read(struct spi_qup *controller,
struct spi_transfer *xfer)
{
@ -266,6 +274,107 @@ static void spi_qup_fifo_write(struct spi_qup *controller,
}
}
static void spi_qup_dma_done(void *data)
{
struct spi_qup *qup = data;
complete(&qup->done);
}
static int spi_qup_prep_sg(struct spi_master *master, struct spi_transfer *xfer,
enum dma_transfer_direction dir,
dma_async_tx_callback callback)
{
struct spi_qup *qup = spi_master_get_devdata(master);
unsigned long flags = DMA_PREP_INTERRUPT | DMA_PREP_FENCE;
struct dma_async_tx_descriptor *desc;
struct scatterlist *sgl;
struct dma_chan *chan;
dma_cookie_t cookie;
unsigned int nents;
if (dir == DMA_MEM_TO_DEV) {
chan = master->dma_tx;
nents = xfer->tx_sg.nents;
sgl = xfer->tx_sg.sgl;
} else {
chan = master->dma_rx;
nents = xfer->rx_sg.nents;
sgl = xfer->rx_sg.sgl;
}
desc = dmaengine_prep_slave_sg(chan, sgl, nents, dir, flags);
if (!desc)
return -EINVAL;
desc->callback = callback;
desc->callback_param = qup;
cookie = dmaengine_submit(desc);
return dma_submit_error(cookie);
}
static void spi_qup_dma_terminate(struct spi_master *master,
struct spi_transfer *xfer)
{
if (xfer->tx_buf)
dmaengine_terminate_all(master->dma_tx);
if (xfer->rx_buf)
dmaengine_terminate_all(master->dma_rx);
}
static int spi_qup_do_dma(struct spi_master *master, struct spi_transfer *xfer)
{
dma_async_tx_callback rx_done = NULL, tx_done = NULL;
int ret;
if (xfer->rx_buf)
rx_done = spi_qup_dma_done;
else if (xfer->tx_buf)
tx_done = spi_qup_dma_done;
if (xfer->rx_buf) {
ret = spi_qup_prep_sg(master, xfer, DMA_DEV_TO_MEM, rx_done);
if (ret)
return ret;
dma_async_issue_pending(master->dma_rx);
}
if (xfer->tx_buf) {
ret = spi_qup_prep_sg(master, xfer, DMA_MEM_TO_DEV, tx_done);
if (ret)
return ret;
dma_async_issue_pending(master->dma_tx);
}
return 0;
}
static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer)
{
struct spi_qup *qup = spi_master_get_devdata(master);
int ret;
ret = spi_qup_set_state(qup, QUP_STATE_RUN);
if (ret) {
dev_warn(qup->dev, "cannot set RUN state\n");
return ret;
}
ret = spi_qup_set_state(qup, QUP_STATE_PAUSE);
if (ret) {
dev_warn(qup->dev, "cannot set PAUSE state\n");
return ret;
}
spi_qup_fifo_write(qup, xfer);
return 0;
}
static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
{
struct spi_qup *controller = dev_id;
@ -315,11 +424,13 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
error = -EIO;
}
if (opflags & QUP_OP_IN_SERVICE_FLAG)
spi_qup_fifo_read(controller, xfer);
if (!controller->use_dma) {
if (opflags & QUP_OP_IN_SERVICE_FLAG)
spi_qup_fifo_read(controller, xfer);
if (opflags & QUP_OP_OUT_SERVICE_FLAG)
spi_qup_fifo_write(controller, xfer);
if (opflags & QUP_OP_OUT_SERVICE_FLAG)
spi_qup_fifo_write(controller, xfer);
}
spin_lock_irqsave(&controller->lock, flags);
controller->error = error;
@ -332,13 +443,35 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
static u32
spi_qup_get_mode(struct spi_master *master, struct spi_transfer *xfer)
{
struct spi_qup *qup = spi_master_get_devdata(master);
u32 mode;
qup->w_size = 4;
if (xfer->bits_per_word <= 8)
qup->w_size = 1;
else if (xfer->bits_per_word <= 16)
qup->w_size = 2;
qup->n_words = xfer->len / qup->w_size;
if (qup->n_words <= (qup->in_fifo_sz / sizeof(u32)))
mode = QUP_IO_M_MODE_FIFO;
else
mode = QUP_IO_M_MODE_BLOCK;
return mode;
}
/* set clock freq ... bits per word */
static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
{
struct spi_qup *controller = spi_master_get_devdata(spi->master);
u32 config, iomode, mode, control;
int ret, n_words, w_size;
int ret, n_words;
if (spi->mode & SPI_LOOP && xfer->len > controller->in_fifo_sz) {
dev_err(controller->dev, "too big size for loopback %d > %d\n",
@ -358,35 +491,54 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
return -EIO;
}
w_size = 4;
if (xfer->bits_per_word <= 8)
w_size = 1;
else if (xfer->bits_per_word <= 16)
w_size = 2;
mode = spi_qup_get_mode(spi->master, xfer);
n_words = controller->n_words;
n_words = xfer->len / w_size;
controller->w_size = w_size;
if (n_words <= (controller->in_fifo_sz / sizeof(u32))) {
mode = QUP_IO_M_MODE_FIFO;
if (mode == QUP_IO_M_MODE_FIFO) {
writel_relaxed(n_words, controller->base + QUP_MX_READ_CNT);
writel_relaxed(n_words, controller->base + QUP_MX_WRITE_CNT);
/* must be zero for FIFO */
writel_relaxed(0, controller->base + QUP_MX_INPUT_CNT);
writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
} else {
mode = QUP_IO_M_MODE_BLOCK;
} else if (!controller->use_dma) {
writel_relaxed(n_words, controller->base + QUP_MX_INPUT_CNT);
writel_relaxed(n_words, controller->base + QUP_MX_OUTPUT_CNT);
/* must be zero for BLOCK and BAM */
writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT);
} else {
mode = QUP_IO_M_MODE_BAM;
writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT);
if (!controller->qup_v1) {
void __iomem *input_cnt;
input_cnt = controller->base + QUP_MX_INPUT_CNT;
/*
* for DMA transfers, both QUP_MX_INPUT_CNT and
* QUP_MX_OUTPUT_CNT must be zero to all cases but one.
* That case is a non-balanced transfer when there is
* only a rx_buf.
*/
if (xfer->tx_buf)
writel_relaxed(0, input_cnt);
else
writel_relaxed(n_words, input_cnt);
writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
}
}
iomode = readl_relaxed(controller->base + QUP_IO_M_MODES);
/* Set input and output transfer mode */
iomode &= ~(QUP_IO_M_INPUT_MODE_MASK | QUP_IO_M_OUTPUT_MODE_MASK);
iomode &= ~(QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN);
if (!controller->use_dma)
iomode &= ~(QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN);
else
iomode |= QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN;
iomode |= (mode << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT);
iomode |= (mode << QUP_IO_M_INPUT_MODE_MASK_SHIFT);
@ -428,11 +580,31 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
config &= ~(QUP_CONFIG_NO_INPUT | QUP_CONFIG_NO_OUTPUT | QUP_CONFIG_N);
config |= xfer->bits_per_word - 1;
config |= QUP_CONFIG_SPI_MODE;
if (controller->use_dma) {
if (!xfer->tx_buf)
config |= QUP_CONFIG_NO_OUTPUT;
if (!xfer->rx_buf)
config |= QUP_CONFIG_NO_INPUT;
}
writel_relaxed(config, controller->base + QUP_CONFIG);
/* only write to OPERATIONAL_MASK when register is present */
if (!controller->qup_v1)
writel_relaxed(0, controller->base + QUP_OPERATIONAL_MASK);
if (!controller->qup_v1) {
u32 mask = 0;
/*
* mask INPUT and OUTPUT service flags to prevent IRQs on FIFO
* status change in BAM mode
*/
if (mode == QUP_IO_M_MODE_BAM)
mask = QUP_OP_IN_SERVICE_FLAG | QUP_OP_OUT_SERVICE_FLAG;
writel_relaxed(mask, controller->base + QUP_OPERATIONAL_MASK);
}
return 0;
}
@ -461,17 +633,13 @@ static int spi_qup_transfer_one(struct spi_master *master,
controller->tx_bytes = 0;
spin_unlock_irqrestore(&controller->lock, flags);
if (spi_qup_set_state(controller, QUP_STATE_RUN)) {
dev_warn(controller->dev, "cannot set RUN state\n");
goto exit;
}
if (controller->use_dma)
ret = spi_qup_do_dma(master, xfer);
else
ret = spi_qup_do_pio(master, xfer);
if (spi_qup_set_state(controller, QUP_STATE_PAUSE)) {
dev_warn(controller->dev, "cannot set PAUSE state\n");
if (ret)
goto exit;
}
spi_qup_fifo_write(controller, xfer);
if (spi_qup_set_state(controller, QUP_STATE_RUN)) {
dev_warn(controller->dev, "cannot set EXECUTE state\n");
@ -480,6 +648,7 @@ static int spi_qup_transfer_one(struct spi_master *master,
if (!wait_for_completion_timeout(&controller->done, timeout))
ret = -ETIMEDOUT;
exit:
spi_qup_set_state(controller, QUP_STATE_RESET);
spin_lock_irqsave(&controller->lock, flags);
@ -487,6 +656,97 @@ exit:
if (!ret)
ret = controller->error;
spin_unlock_irqrestore(&controller->lock, flags);
if (ret && controller->use_dma)
spi_qup_dma_terminate(master, xfer);
return ret;
}
static bool spi_qup_can_dma(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *xfer)
{
struct spi_qup *qup = spi_master_get_devdata(master);
size_t dma_align = dma_get_cache_alignment();
u32 mode;
qup->use_dma = 0;
if (xfer->rx_buf && (xfer->len % qup->in_blk_sz ||
IS_ERR_OR_NULL(master->dma_rx) ||
!IS_ALIGNED((size_t)xfer->rx_buf, dma_align)))
return false;
if (xfer->tx_buf && (xfer->len % qup->out_blk_sz ||
IS_ERR_OR_NULL(master->dma_tx) ||
!IS_ALIGNED((size_t)xfer->tx_buf, dma_align)))
return false;
mode = spi_qup_get_mode(master, xfer);
if (mode == QUP_IO_M_MODE_FIFO)
return false;
qup->use_dma = 1;
return true;
}
static void spi_qup_release_dma(struct spi_master *master)
{
if (!IS_ERR_OR_NULL(master->dma_rx))
dma_release_channel(master->dma_rx);
if (!IS_ERR_OR_NULL(master->dma_tx))
dma_release_channel(master->dma_tx);
}
static int spi_qup_init_dma(struct spi_master *master, resource_size_t base)
{
struct spi_qup *spi = spi_master_get_devdata(master);
struct dma_slave_config *rx_conf = &spi->rx_conf,
*tx_conf = &spi->tx_conf;
struct device *dev = spi->dev;
int ret;
/* allocate dma resources, if available */
master->dma_rx = dma_request_slave_channel_reason(dev, "rx");
if (IS_ERR(master->dma_rx))
return PTR_ERR(master->dma_rx);
master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
if (IS_ERR(master->dma_tx)) {
ret = PTR_ERR(master->dma_tx);
goto err_tx;
}
/* set DMA parameters */
rx_conf->direction = DMA_DEV_TO_MEM;
rx_conf->device_fc = 1;
rx_conf->src_addr = base + QUP_INPUT_FIFO;
rx_conf->src_maxburst = spi->in_blk_sz;
tx_conf->direction = DMA_MEM_TO_DEV;
tx_conf->device_fc = 1;
tx_conf->dst_addr = base + QUP_OUTPUT_FIFO;
tx_conf->dst_maxburst = spi->out_blk_sz;
ret = dmaengine_slave_config(master->dma_rx, rx_conf);
if (ret) {
dev_err(dev, "failed to configure RX channel\n");
goto err;
}
ret = dmaengine_slave_config(master->dma_tx, tx_conf);
if (ret) {
dev_err(dev, "failed to configure TX channel\n");
goto err;
}
return 0;
err:
dma_release_channel(master->dma_tx);
err_tx:
dma_release_channel(master->dma_rx);
return ret;
}
@ -563,6 +823,8 @@ static int spi_qup_probe(struct platform_device *pdev)
master->transfer_one = spi_qup_transfer_one;
master->dev.of_node = pdev->dev.of_node;
master->auto_runtime_pm = true;
master->dma_alignment = dma_get_cache_alignment();
master->max_dma_len = SPI_MAX_DMA_XFER;
platform_set_drvdata(pdev, master);
@ -574,6 +836,12 @@ static int spi_qup_probe(struct platform_device *pdev)
controller->cclk = cclk;
controller->irq = irq;
ret = spi_qup_init_dma(master, res->start);
if (ret == -EPROBE_DEFER)
goto error;
else if (!ret)
master->can_dma = spi_qup_can_dma;
/* set v1 flag if device is version 1 */
if (of_device_is_compatible(dev->of_node, "qcom,spi-qup-v1.1.1"))
controller->qup_v1 = 1;
@ -610,7 +878,7 @@ static int spi_qup_probe(struct platform_device *pdev)
ret = spi_qup_set_state(controller, QUP_STATE_RESET);
if (ret) {
dev_err(dev, "cannot set RESET state\n");
goto error;
goto error_dma;
}
writel_relaxed(0, base + QUP_OPERATIONAL);
@ -634,7 +902,7 @@ static int spi_qup_probe(struct platform_device *pdev)
ret = devm_request_irq(dev, irq, spi_qup_qup_irq,
IRQF_TRIGGER_HIGH, pdev->name, controller);
if (ret)
goto error;
goto error_dma;
pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
pm_runtime_use_autosuspend(dev);
@ -649,6 +917,8 @@ static int spi_qup_probe(struct platform_device *pdev)
disable_pm:
pm_runtime_disable(&pdev->dev);
error_dma:
spi_qup_release_dma(master);
error:
clk_disable_unprepare(cclk);
clk_disable_unprepare(iclk);
@ -740,6 +1010,8 @@ static int spi_qup_remove(struct platform_device *pdev)
if (ret)
return ret;
spi_qup_release_dma(master);
clk_disable_unprepare(controller->cclk);
clk_disable_unprepare(controller->iclk);

38
drivers/spi/spi-rockchip.c
View File

@ -179,6 +179,7 @@ struct rockchip_spi {
u8 tmode;
u8 bpw;
u8 n_bytes;
u8 rsd_nsecs;
unsigned len;
u32 speed;
@ -302,8 +303,8 @@ static int rockchip_spi_prepare_message(struct spi_master *master,
return 0;
}
static int rockchip_spi_unprepare_message(struct spi_master *master,
struct spi_message *msg)
static void rockchip_spi_handle_err(struct spi_master *master,
struct spi_message *msg)
{
unsigned long flags;
struct rockchip_spi *rs = spi_master_get_devdata(master);
@ -313,8 +314,8 @@ static int rockchip_spi_unprepare_message(struct spi_master *master,
/*
* For DMA mode, we need terminate DMA channel and flush
* fifo for the next transfer if DMA thansfer timeout.
* unprepare_message() was called by core if transfer complete
* or timeout. Maybe it is reasonable for error handling here.
* handle_err() was called by core if transfer failed.
* Maybe it is reasonable for error handling here.
*/
if (rs->use_dma) {
if (rs->state & RXBUSY) {
@ -327,6 +328,12 @@ static int rockchip_spi_unprepare_message(struct spi_master *master,
}
spin_unlock_irqrestore(&rs->lock, flags);
}
static int rockchip_spi_unprepare_message(struct spi_master *master,
struct spi_message *msg)
{
struct rockchip_spi *rs = spi_master_get_devdata(master);
spi_enable_chip(rs, 0);
@ -493,6 +500,7 @@ static void rockchip_spi_config(struct rockchip_spi *rs)
{
u32 div = 0;
u32 dmacr = 0;
int rsd = 0;
u32 cr0 = (CR0_BHT_8BIT << CR0_BHT_OFFSET)
| (CR0_SSD_ONE << CR0_SSD_OFFSET);
@ -519,9 +527,23 @@ static void rockchip_spi_config(struct rockchip_spi *rs)
}
/* div doesn't support odd number */
div = max_t(u32, rs->max_freq / rs->speed, 1);
div = DIV_ROUND_UP(rs->max_freq, rs->speed);
div = (div + 1) & 0xfffe;
/* Rx sample delay is expressed in parent clock cycles (max 3) */
rsd = DIV_ROUND_CLOSEST(rs->rsd_nsecs * (rs->max_freq >> 8),
1000000000 >> 8);
if (!rsd && rs->rsd_nsecs) {
pr_warn_once("rockchip-spi: %u Hz are too slow to express %u ns delay\n",
rs->max_freq, rs->rsd_nsecs);
} else if (rsd > 3) {
rsd = 3;
pr_warn_once("rockchip-spi: %u Hz are too fast to express %u ns delay, clamping at %u ns\n",
rs->max_freq, rs->rsd_nsecs,
rsd * 1000000000U / rs->max_freq);
}
cr0 |= rsd << CR0_RSD_OFFSET;
writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
writel_relaxed(rs->len - 1, rs->regs + ROCKCHIP_SPI_CTRLR1);
@ -614,6 +636,7 @@ static int rockchip_spi_probe(struct platform_device *pdev)
struct rockchip_spi *rs;
struct spi_master *master;
struct resource *mem;
u32 rsd_nsecs;
master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));
if (!master)
@ -665,6 +688,10 @@ static int rockchip_spi_probe(struct platform_device *pdev)
rs->dev = &pdev->dev;
rs->max_freq = clk_get_rate(rs->spiclk);
if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns",
&rsd_nsecs))
rs->rsd_nsecs = rsd_nsecs;
rs->fifo_len = get_fifo_len(rs);
if (!rs->fifo_len) {
dev_err(&pdev->dev, "Failed to get fifo length\n");
@ -688,6 +715,7 @@ static int rockchip_spi_probe(struct platform_device *pdev)
master->prepare_message = rockchip_spi_prepare_message;
master->unprepare_message = rockchip_spi_unprepare_message;
master->transfer_one = rockchip_spi_transfer_one;
master->handle_err = rockchip_spi_handle_err;
rs->dma_tx.ch = dma_request_slave_channel(rs->dev, "tx");
if (!rs->dma_tx.ch)

126
drivers/spi/spi-rspi.c
View File

@ -177,6 +177,13 @@
#define SPBFCR_RXRST 0x40 /* Receive Buffer Data Reset */
#define SPBFCR_TXTRG_MASK 0x30 /* Transmit Buffer Data Triggering Number */
#define SPBFCR_RXTRG_MASK 0x07 /* Receive Buffer Data Triggering Number */
/* QSPI on R-Car Gen2 */
#define SPBFCR_TXTRG_1B 0x00 /* 31 bytes (1 byte available) */
#define SPBFCR_TXTRG_32B 0x30 /* 0 byte (32 bytes available) */
#define SPBFCR_RXTRG_1B 0x00 /* 1 byte (31 bytes available) */
#define SPBFCR_RXTRG_32B 0x07 /* 32 bytes (0 byte available) */
#define QSPI_BUFFER_SIZE 32u
struct rspi_data {
void __iomem *addr;
@ -366,6 +373,52 @@ static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
return 0;
}
static void qspi_update(const struct rspi_data *rspi, u8 mask, u8 val, u8 reg)
{
u8 data;
data = rspi_read8(rspi, reg);
data &= ~mask;
data |= (val & mask);
rspi_write8(rspi, data, reg);
}
static int qspi_set_send_trigger(struct rspi_data *rspi, unsigned int len)
{
unsigned int n;
n = min(len, QSPI_BUFFER_SIZE);
if (len >= QSPI_BUFFER_SIZE) {
/* sets triggering number to 32 bytes */
qspi_update(rspi, SPBFCR_TXTRG_MASK,
SPBFCR_TXTRG_32B, QSPI_SPBFCR);
} else {
/* sets triggering number to 1 byte */
qspi_update(rspi, SPBFCR_TXTRG_MASK,
SPBFCR_TXTRG_1B, QSPI_SPBFCR);
}
return n;
}
static void qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
{
unsigned int n;
n = min(len, QSPI_BUFFER_SIZE);
if (len >= QSPI_BUFFER_SIZE) {
/* sets triggering number to 32 bytes */
qspi_update(rspi, SPBFCR_RXTRG_MASK,
SPBFCR_RXTRG_32B, QSPI_SPBFCR);
} else {
/* sets triggering number to 1 byte */
qspi_update(rspi, SPBFCR_RXTRG_MASK,
SPBFCR_RXTRG_1B, QSPI_SPBFCR);
}
}
#define set_config_register(spi, n) spi->ops->set_config_register(spi, n)
static void rspi_enable_irq(const struct rspi_data *rspi, u8 enable)
@ -609,18 +662,28 @@ static bool rspi_can_dma(struct spi_master *master, struct spi_device *spi,
return __rspi_can_dma(rspi, xfer);
}
static int rspi_dma_check_then_transfer(struct rspi_data *rspi,
struct spi_transfer *xfer)
{
if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) {
/* rx_buf can be NULL on RSPI on SH in TX-only Mode */
int ret = rspi_dma_transfer(rspi, &xfer->tx_sg,
xfer->rx_buf ? &xfer->rx_sg : NULL);
if (ret != -EAGAIN)
return 0;
}
return -EAGAIN;
}
static int rspi_common_transfer(struct rspi_data *rspi,
struct spi_transfer *xfer)
{
int ret;
if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) {
/* rx_buf can be NULL on RSPI on SH in TX-only Mode */
ret = rspi_dma_transfer(rspi, &xfer->tx_sg,
xfer->rx_buf ? &xfer->rx_sg : NULL);
if (ret != -EAGAIN)
return ret;
}
ret = rspi_dma_check_then_transfer(rspi, xfer);
if (ret != -EAGAIN)
return ret;
ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
if (ret < 0)
@ -661,12 +724,59 @@ static int rspi_rz_transfer_one(struct spi_master *master,
return rspi_common_transfer(rspi, xfer);
}
static int qspi_trigger_transfer_out_int(struct rspi_data *rspi, const u8 *tx,
u8 *rx, unsigned int len)
{
int i, n, ret;
int error;
while (len > 0) {
n = qspi_set_send_trigger(rspi, len);
qspi_set_receive_trigger(rspi, len);
if (n == QSPI_BUFFER_SIZE) {
error = rspi_wait_for_tx_empty(rspi);
if (error < 0) {
dev_err(&rspi->master->dev, "transmit timeout\n");
return error;
}
for (i = 0; i < n; i++)
rspi_write_data(rspi, *tx++);
error = rspi_wait_for_rx_full(rspi);
if (error < 0) {
dev_err(&rspi->master->dev, "receive timeout\n");
return error;
}
for (i = 0; i < n; i++)
*rx++ = rspi_read_data(rspi);
} else {
ret = rspi_pio_transfer(rspi, tx, rx, n);
if (ret < 0)
return ret;
}
len -= n;
}
return 0;
}
static int qspi_transfer_out_in(struct rspi_data *rspi,
struct spi_transfer *xfer)
{
int ret;
qspi_receive_init(rspi);
return rspi_common_transfer(rspi, xfer);
ret = rspi_dma_check_then_transfer(rspi, xfer);
if (ret != -EAGAIN)
return ret;
ret = qspi_trigger_transfer_out_int(rspi, xfer->tx_buf,
xfer->rx_buf, xfer->len);
if (ret < 0)
return ret;
return 0;
}
static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)

4
drivers/spi/spi-s3c64xx.c
View File

@ -324,7 +324,7 @@ static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
/* Acquire DMA channels */
sdd->rx_dma.ch = dma_request_slave_channel_compat(mask, filter,
(void *)sdd->rx_dma.dmach, dev, "rx");
(void *)(long)sdd->rx_dma.dmach, dev, "rx");
if (!sdd->rx_dma.ch) {
dev_err(dev, "Failed to get RX DMA channel\n");
ret = -EBUSY;
@ -333,7 +333,7 @@ static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
spi->dma_rx = sdd->rx_dma.ch;
sdd->tx_dma.ch = dma_request_slave_channel_compat(mask, filter,
(void *)sdd->tx_dma.dmach, dev, "tx");
(void *)(long)sdd->tx_dma.dmach, dev, "tx");
if (!sdd->tx_dma.ch) {
dev_err(dev, "Failed to get TX DMA channel\n");
ret = -EBUSY;

2
drivers/spi/spi-sc18is602.c
View File

@ -286,7 +286,7 @@ static int sc18is602_probe(struct i2c_client *client,
hw->freq = SC18IS602_CLOCK;
break;
}
master->bus_num = client->adapter->nr;
master->bus_num = np ? -1 : client->adapter->nr;
master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LSB_FIRST;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->setup = sc18is602_setup;

2
drivers/spi/spi-st-ssc4.c
View File

@ -482,7 +482,7 @@ static const struct dev_pm_ops spi_st_pm = {
SET_RUNTIME_PM_OPS(spi_st_runtime_suspend, spi_st_runtime_resume, NULL)
};
static struct of_device_id stm_spi_match[] = {
static const struct of_device_id stm_spi_match[] = {
{ .compatible = "st,comms-ssc4-spi", },
{},
};

130
drivers/spi/spi.c
View File

@ -16,7 +16,6 @@
*/
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/cache.h>
@ -129,125 +128,11 @@ static int spi_uevent(struct device *dev, struct kobj_uevent_env *env)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int spi_legacy_suspend(struct device *dev, pm_message_t message)
{
int value = 0;
struct spi_driver *drv = to_spi_driver(dev->driver);
/* suspend will stop irqs and dma; no more i/o */
if (drv) {
if (drv->suspend)
value = drv->suspend(to_spi_device(dev), message);
else
dev_dbg(dev, "... can't suspend\n");
}
return value;
}
static int spi_legacy_resume(struct device *dev)
{
int value = 0;
struct spi_driver *drv = to_spi_driver(dev->driver);
/* resume may restart the i/o queue */
if (drv) {
if (drv->resume)
value = drv->resume(to_spi_device(dev));
else
dev_dbg(dev, "... can't resume\n");
}
return value;
}
static int spi_pm_suspend(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (pm)
return pm_generic_suspend(dev);
else
return spi_legacy_suspend(dev, PMSG_SUSPEND);
}
static int spi_pm_resume(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (pm)
return pm_generic_resume(dev);
else
return spi_legacy_resume(dev);
}
static int spi_pm_freeze(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (pm)
return pm_generic_freeze(dev);
else
return spi_legacy_suspend(dev, PMSG_FREEZE);
}
static int spi_pm_thaw(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (pm)
return pm_generic_thaw(dev);
else
return spi_legacy_resume(dev);
}
static int spi_pm_poweroff(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (pm)
return pm_generic_poweroff(dev);
else
return spi_legacy_suspend(dev, PMSG_HIBERNATE);
}
static int spi_pm_restore(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (pm)
return pm_generic_restore(dev);
else
return spi_legacy_resume(dev);
}
#else
#define spi_pm_suspend NULL
#define spi_pm_resume NULL
#define spi_pm_freeze NULL
#define spi_pm_thaw NULL
#define spi_pm_poweroff NULL
#define spi_pm_restore NULL
#endif
static const struct dev_pm_ops spi_pm = {
.suspend = spi_pm_suspend,
.resume = spi_pm_resume,
.freeze = spi_pm_freeze,
.thaw = spi_pm_thaw,
.poweroff = spi_pm_poweroff,
.restore = spi_pm_restore,
SET_RUNTIME_PM_OPS(
pm_generic_runtime_suspend,
pm_generic_runtime_resume,
NULL
)
};
struct bus_type spi_bus_type = {
.name = "spi",
.dev_groups = spi_dev_groups,
.match = spi_match_device,
.uevent = spi_uevent,
.pm = &spi_pm,
};
EXPORT_SYMBOL_GPL(spi_bus_type);
@ -698,6 +583,15 @@ static int spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
rx_dev = master->dma_rx->device->dev;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
/*
* Restore the original value of tx_buf or rx_buf if they are
* NULL.
*/
if (xfer->tx_buf == master->dummy_tx)
xfer->tx_buf = NULL;
if (xfer->rx_buf == master->dummy_rx)
xfer->rx_buf = NULL;
if (!master->can_dma(master, msg->spi, xfer))
continue;
@ -851,6 +745,9 @@ out:
if (msg->status == -EINPROGRESS)
msg->status = ret;
if (msg->status && master->handle_err)
master->handle_err(master, msg);
spi_finalize_current_message(master);
return ret;
@ -1360,7 +1257,6 @@ of_register_spi_device(struct spi_master *master, struct device_node *nc)
spi->dev.of_node = nc;
/* Register the new device */
request_module("%s%s", SPI_MODULE_PREFIX, spi->modalias);
rc = spi_add_device(spi);
if (rc) {
dev_err(&master->dev, "spi_device register error %s\n",
@ -1894,6 +1790,8 @@ int spi_setup(struct spi_device *spi)
if (!spi->max_speed_hz)
spi->max_speed_hz = spi->master->max_speed_hz;
spi_set_cs(spi, false);
if (spi->master->setup)
status = spi->master->setup(spi);

55
drivers/spi/spidev.c
View File

@ -223,7 +223,7 @@ static int spidev_message(struct spidev_data *spidev,
struct spi_transfer *k_xfers;
struct spi_transfer *k_tmp;
struct spi_ioc_transfer *u_tmp;
unsigned n, total;
unsigned n, total, tx_total, rx_total;
u8 *tx_buf, *rx_buf;
int status = -EFAULT;
@ -239,33 +239,52 @@ static int spidev_message(struct spidev_data *spidev,
tx_buf = spidev->tx_buffer;
rx_buf = spidev->rx_buffer;
total = 0;
tx_total = 0;
rx_total = 0;
for (n = n_xfers, k_tmp = k_xfers, u_tmp = u_xfers;
n;
n--, k_tmp++, u_tmp++) {
k_tmp->len = u_tmp->len;
total += k_tmp->len;
if (total > bufsiz) {
/* Since the function returns the total length of transfers
* on success, restrict the total to positive int values to
* avoid the return value looking like an error. Also check
* each transfer length to avoid arithmetic overflow.
*/
if (total > INT_MAX || k_tmp->len > INT_MAX) {
status = -EMSGSIZE;
goto done;
}
if (u_tmp->rx_buf) {
/* this transfer needs space in RX bounce buffer */
rx_total += k_tmp->len;
if (rx_total > bufsiz) {
status = -EMSGSIZE;
goto done;
}
k_tmp->rx_buf = rx_buf;
if (!access_ok(VERIFY_WRITE, (u8 __user *)
(uintptr_t) u_tmp->rx_buf,
u_tmp->len))
goto done;
rx_buf += k_tmp->len;
}
if (u_tmp->tx_buf) {
/* this transfer needs space in TX bounce buffer */
tx_total += k_tmp->len;
if (tx_total > bufsiz) {
status = -EMSGSIZE;
goto done;
}
k_tmp->tx_buf = tx_buf;
if (copy_from_user(tx_buf, (const u8 __user *)
(uintptr_t) u_tmp->tx_buf,
u_tmp->len))
goto done;
tx_buf += k_tmp->len;
}
tx_buf += k_tmp->len;
rx_buf += k_tmp->len;
k_tmp->cs_change = !!u_tmp->cs_change;
k_tmp->tx_nbits = u_tmp->tx_nbits;
@ -303,8 +322,8 @@ static int spidev_message(struct spidev_data *spidev,
status = -EFAULT;
goto done;
}
rx_buf += u_tmp->len;
}
rx_buf += u_tmp->len;
}
status = total;
@ -684,6 +703,14 @@ static const struct file_operations spidev_fops = {
static struct class *spidev_class;
#ifdef CONFIG_OF
static const struct of_device_id spidev_dt_ids[] = {
{ .compatible = "rohm,dh2228fv" },
{},
};
MODULE_DEVICE_TABLE(of, spidev_dt_ids);
#endif
/*-------------------------------------------------------------------------*/
static int spidev_probe(struct spi_device *spi)
@ -692,6 +719,17 @@ static int spidev_probe(struct spi_device *spi)
int status;
unsigned long minor;
/*
* spidev should never be referenced in DT without a specific
* compatbile string, it is a Linux implementation thing
* rather than a description of the hardware.
*/
if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) {
dev_err(&spi->dev, "buggy DT: spidev listed directly in DT\n");
WARN_ON(spi->dev.of_node &&
!of_match_device(spidev_dt_ids, &spi->dev));
}
/* Allocate driver data */
spidev = kzalloc(sizeof(*spidev), GFP_KERNEL);
if (!spidev)
@ -758,13 +796,6 @@ static int spidev_remove(struct spi_device *spi)
return 0;
}
static const struct of_device_id spidev_dt_ids[] = {
{ .compatible = "rohm,dh2228fv" },
{},
};
MODULE_DEVICE_TABLE(of, spidev_dt_ids);
static struct spi_driver spidev_spi_driver = {
.driver = {
.name = "spidev",

76
include/linux/intel_mid_dma.h
View File

@ -1,76 +0,0 @@
/*
* intel_mid_dma.h - Intel MID DMA Drivers
*
* Copyright (C) 2008-10 Intel Corp
* Author: Vinod Koul <vinod.koul@intel.com>
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*
*/
#ifndef __INTEL_MID_DMA_H__
#define __INTEL_MID_DMA_H__
#include <linux/dmaengine.h>
#define DMA_PREP_CIRCULAR_LIST (1 << 10)
/*DMA mode configurations*/
enum intel_mid_dma_mode {
LNW_DMA_PER_TO_MEM = 0, /*periphral to memory configuration*/
LNW_DMA_MEM_TO_PER, /*memory to periphral configuration*/
LNW_DMA_MEM_TO_MEM, /*mem to mem confg (testing only)*/
};
/*DMA handshaking*/
enum intel_mid_dma_hs_mode {
LNW_DMA_HW_HS = 0, /*HW Handshaking only*/
LNW_DMA_SW_HS = 1, /*SW Handshaking not recommended*/
};
/*Burst size configuration*/
enum intel_mid_dma_msize {
LNW_DMA_MSIZE_1 = 0x0,
LNW_DMA_MSIZE_4 = 0x1,
LNW_DMA_MSIZE_8 = 0x2,
LNW_DMA_MSIZE_16 = 0x3,
LNW_DMA_MSIZE_32 = 0x4,
LNW_DMA_MSIZE_64 = 0x5,
};
/**
* struct intel_mid_dma_slave - DMA slave structure
*
* @dirn: DMA trf direction
* @src_width: tx register width
* @dst_width: rx register width
* @hs_mode: HW/SW handshaking mode
* @cfg_mode: DMA data transfer mode (per-per/mem-per/mem-mem)
* @src_msize: Source DMA burst size
* @dst_msize: Dst DMA burst size
* @per_addr: Periphral address
* @device_instance: DMA peripheral device instance, we can have multiple
* peripheral device connected to single DMAC
*/
struct intel_mid_dma_slave {
enum intel_mid_dma_hs_mode hs_mode; /*handshaking*/
enum intel_mid_dma_mode cfg_mode; /*mode configuration*/
unsigned int device_instance; /*0, 1 for periphral instance*/
struct dma_slave_config dma_slave;
};
#endif /*__INTEL_MID_DMA_H__*/

8
include/linux/spi/spi.h
View File

@ -162,8 +162,6 @@ struct spi_transfer;
* @remove: Unbinds this driver from the spi device
* @shutdown: Standard shutdown callback used during system state
* transitions such as powerdown/halt and kexec
* @suspend: Standard suspend callback used during system state transitions
* @resume: Standard resume callback used during system state transitions
* @driver: SPI device drivers should initialize the name and owner
* field of this structure.
*
@ -184,8 +182,6 @@ struct spi_driver {
int (*probe)(struct spi_device *spi);
int (*remove)(struct spi_device *spi);
void (*shutdown)(struct spi_device *spi);
int (*suspend)(struct spi_device *spi, pm_message_t mesg);
int (*resume)(struct spi_device *spi);
struct device_driver driver;
};
@ -294,6 +290,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* transfer_one_message are mutually exclusive; when both
* are set, the generic subsystem does not call your
* transfer_one callback.
* @handle_err: the subsystem calls the driver to handle an error that occurs
* in the generic implementation of transfer_one_message().
* @unprepare_message: undo any work done by prepare_message().
* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS
* number. Any individual value may be -ENOENT for CS lines that
@ -448,6 +446,8 @@ struct spi_master {
void (*set_cs)(struct spi_device *spi, bool enable);
int (*transfer_one)(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *transfer);
void (*handle_err)(struct spi_master *master,
struct spi_message *message);
/* gpio chip select */
int *cs_gpios;