mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
931 lines
22 KiB
C
931 lines
22 KiB
C
/*
|
|
* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
|
|
* Author: Addy Ke <addy.ke@rock-chips.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/pinctrl/consumer.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/scatterlist.h>
|
|
|
|
#define DRIVER_NAME "rockchip-spi"
|
|
|
|
#define ROCKCHIP_SPI_CLR_BITS(reg, bits) \
|
|
writel_relaxed(readl_relaxed(reg) & ~(bits), reg)
|
|
#define ROCKCHIP_SPI_SET_BITS(reg, bits) \
|
|
writel_relaxed(readl_relaxed(reg) | (bits), reg)
|
|
|
|
/* SPI register offsets */
|
|
#define ROCKCHIP_SPI_CTRLR0 0x0000
|
|
#define ROCKCHIP_SPI_CTRLR1 0x0004
|
|
#define ROCKCHIP_SPI_SSIENR 0x0008
|
|
#define ROCKCHIP_SPI_SER 0x000c
|
|
#define ROCKCHIP_SPI_BAUDR 0x0010
|
|
#define ROCKCHIP_SPI_TXFTLR 0x0014
|
|
#define ROCKCHIP_SPI_RXFTLR 0x0018
|
|
#define ROCKCHIP_SPI_TXFLR 0x001c
|
|
#define ROCKCHIP_SPI_RXFLR 0x0020
|
|
#define ROCKCHIP_SPI_SR 0x0024
|
|
#define ROCKCHIP_SPI_IPR 0x0028
|
|
#define ROCKCHIP_SPI_IMR 0x002c
|
|
#define ROCKCHIP_SPI_ISR 0x0030
|
|
#define ROCKCHIP_SPI_RISR 0x0034
|
|
#define ROCKCHIP_SPI_ICR 0x0038
|
|
#define ROCKCHIP_SPI_DMACR 0x003c
|
|
#define ROCKCHIP_SPI_DMATDLR 0x0040
|
|
#define ROCKCHIP_SPI_DMARDLR 0x0044
|
|
#define ROCKCHIP_SPI_TXDR 0x0400
|
|
#define ROCKCHIP_SPI_RXDR 0x0800
|
|
|
|
/* Bit fields in CTRLR0 */
|
|
#define CR0_DFS_OFFSET 0
|
|
|
|
#define CR0_CFS_OFFSET 2
|
|
|
|
#define CR0_SCPH_OFFSET 6
|
|
|
|
#define CR0_SCPOL_OFFSET 7
|
|
|
|
#define CR0_CSM_OFFSET 8
|
|
#define CR0_CSM_KEEP 0x0
|
|
/* ss_n be high for half sclk_out cycles */
|
|
#define CR0_CSM_HALF 0X1
|
|
/* ss_n be high for one sclk_out cycle */
|
|
#define CR0_CSM_ONE 0x2
|
|
|
|
/* ss_n to sclk_out delay */
|
|
#define CR0_SSD_OFFSET 10
|
|
/*
|
|
* The period between ss_n active and
|
|
* sclk_out active is half sclk_out cycles
|
|
*/
|
|
#define CR0_SSD_HALF 0x0
|
|
/*
|
|
* The period between ss_n active and
|
|
* sclk_out active is one sclk_out cycle
|
|
*/
|
|
#define CR0_SSD_ONE 0x1
|
|
|
|
#define CR0_EM_OFFSET 11
|
|
#define CR0_EM_LITTLE 0x0
|
|
#define CR0_EM_BIG 0x1
|
|
|
|
#define CR0_FBM_OFFSET 12
|
|
#define CR0_FBM_MSB 0x0
|
|
#define CR0_FBM_LSB 0x1
|
|
|
|
#define CR0_BHT_OFFSET 13
|
|
#define CR0_BHT_16BIT 0x0
|
|
#define CR0_BHT_8BIT 0x1
|
|
|
|
#define CR0_RSD_OFFSET 14
|
|
|
|
#define CR0_FRF_OFFSET 16
|
|
#define CR0_FRF_SPI 0x0
|
|
#define CR0_FRF_SSP 0x1
|
|
#define CR0_FRF_MICROWIRE 0x2
|
|
|
|
#define CR0_XFM_OFFSET 18
|
|
#define CR0_XFM_MASK (0x03 << SPI_XFM_OFFSET)
|
|
#define CR0_XFM_TR 0x0
|
|
#define CR0_XFM_TO 0x1
|
|
#define CR0_XFM_RO 0x2
|
|
|
|
#define CR0_OPM_OFFSET 20
|
|
#define CR0_OPM_MASTER 0x0
|
|
#define CR0_OPM_SLAVE 0x1
|
|
|
|
#define CR0_MTM_OFFSET 0x21
|
|
|
|
/* Bit fields in SER, 2bit */
|
|
#define SER_MASK 0x3
|
|
|
|
/* Bit fields in SR, 5bit */
|
|
#define SR_MASK 0x1f
|
|
#define SR_BUSY (1 << 0)
|
|
#define SR_TF_FULL (1 << 1)
|
|
#define SR_TF_EMPTY (1 << 2)
|
|
#define SR_RF_EMPTY (1 << 3)
|
|
#define SR_RF_FULL (1 << 4)
|
|
|
|
/* Bit fields in ISR, IMR, ISR, RISR, 5bit */
|
|
#define INT_MASK 0x1f
|
|
#define INT_TF_EMPTY (1 << 0)
|
|
#define INT_TF_OVERFLOW (1 << 1)
|
|
#define INT_RF_UNDERFLOW (1 << 2)
|
|
#define INT_RF_OVERFLOW (1 << 3)
|
|
#define INT_RF_FULL (1 << 4)
|
|
|
|
/* Bit fields in ICR, 4bit */
|
|
#define ICR_MASK 0x0f
|
|
#define ICR_ALL (1 << 0)
|
|
#define ICR_RF_UNDERFLOW (1 << 1)
|
|
#define ICR_RF_OVERFLOW (1 << 2)
|
|
#define ICR_TF_OVERFLOW (1 << 3)
|
|
|
|
/* Bit fields in DMACR */
|
|
#define RF_DMA_EN (1 << 0)
|
|
#define TF_DMA_EN (1 << 1)
|
|
|
|
#define RXBUSY (1 << 0)
|
|
#define TXBUSY (1 << 1)
|
|
|
|
/* sclk_out: spi master internal logic in rk3x can support 50Mhz */
|
|
#define MAX_SCLK_OUT 50000000
|
|
|
|
/*
|
|
* SPI_CTRLR1 is 16-bits, so we should support lengths of 0xffff + 1. However,
|
|
* the controller seems to hang when given 0x10000, so stick with this for now.
|
|
*/
|
|
#define ROCKCHIP_SPI_MAX_TRANLEN 0xffff
|
|
|
|
#define ROCKCHIP_SPI_MAX_CS_NUM 2
|
|
|
|
enum rockchip_ssi_type {
|
|
SSI_MOTO_SPI = 0,
|
|
SSI_TI_SSP,
|
|
SSI_NS_MICROWIRE,
|
|
};
|
|
|
|
struct rockchip_spi_dma_data {
|
|
struct dma_chan *ch;
|
|
dma_addr_t addr;
|
|
};
|
|
|
|
struct rockchip_spi {
|
|
struct device *dev;
|
|
struct spi_master *master;
|
|
|
|
struct clk *spiclk;
|
|
struct clk *apb_pclk;
|
|
|
|
void __iomem *regs;
|
|
/*depth of the FIFO buffer */
|
|
u32 fifo_len;
|
|
/* max bus freq supported */
|
|
u32 max_freq;
|
|
/* supported slave numbers */
|
|
enum rockchip_ssi_type type;
|
|
|
|
u16 mode;
|
|
u8 tmode;
|
|
u8 bpw;
|
|
u8 n_bytes;
|
|
u32 rsd_nsecs;
|
|
unsigned len;
|
|
u32 speed;
|
|
|
|
const void *tx;
|
|
const void *tx_end;
|
|
void *rx;
|
|
void *rx_end;
|
|
|
|
u32 state;
|
|
/* protect state */
|
|
spinlock_t lock;
|
|
|
|
bool cs_asserted[ROCKCHIP_SPI_MAX_CS_NUM];
|
|
|
|
bool use_dma;
|
|
struct sg_table tx_sg;
|
|
struct sg_table rx_sg;
|
|
struct rockchip_spi_dma_data dma_rx;
|
|
struct rockchip_spi_dma_data dma_tx;
|
|
};
|
|
|
|
static inline void spi_enable_chip(struct rockchip_spi *rs, int enable)
|
|
{
|
|
writel_relaxed((enable ? 1 : 0), rs->regs + ROCKCHIP_SPI_SSIENR);
|
|
}
|
|
|
|
static inline void spi_set_clk(struct rockchip_spi *rs, u16 div)
|
|
{
|
|
writel_relaxed(div, rs->regs + ROCKCHIP_SPI_BAUDR);
|
|
}
|
|
|
|
static inline void flush_fifo(struct rockchip_spi *rs)
|
|
{
|
|
while (readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR))
|
|
readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
|
|
}
|
|
|
|
static inline void wait_for_idle(struct rockchip_spi *rs)
|
|
{
|
|
unsigned long timeout = jiffies + msecs_to_jiffies(5);
|
|
|
|
do {
|
|
if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
|
|
return;
|
|
} while (!time_after(jiffies, timeout));
|
|
|
|
dev_warn(rs->dev, "spi controller is in busy state!\n");
|
|
}
|
|
|
|
static u32 get_fifo_len(struct rockchip_spi *rs)
|
|
{
|
|
u32 fifo;
|
|
|
|
for (fifo = 2; fifo < 32; fifo++) {
|
|
writel_relaxed(fifo, rs->regs + ROCKCHIP_SPI_TXFTLR);
|
|
if (fifo != readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFTLR))
|
|
break;
|
|
}
|
|
|
|
writel_relaxed(0, rs->regs + ROCKCHIP_SPI_TXFTLR);
|
|
|
|
return (fifo == 31) ? 0 : fifo;
|
|
}
|
|
|
|
static inline u32 tx_max(struct rockchip_spi *rs)
|
|
{
|
|
u32 tx_left, tx_room;
|
|
|
|
tx_left = (rs->tx_end - rs->tx) / rs->n_bytes;
|
|
tx_room = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR);
|
|
|
|
return min(tx_left, tx_room);
|
|
}
|
|
|
|
static inline u32 rx_max(struct rockchip_spi *rs)
|
|
{
|
|
u32 rx_left = (rs->rx_end - rs->rx) / rs->n_bytes;
|
|
u32 rx_room = (u32)readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
|
|
|
|
return min(rx_left, rx_room);
|
|
}
|
|
|
|
static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
|
|
{
|
|
struct spi_master *master = spi->master;
|
|
struct rockchip_spi *rs = spi_master_get_devdata(master);
|
|
bool cs_asserted = !enable;
|
|
|
|
/* Return immediately for no-op */
|
|
if (cs_asserted == rs->cs_asserted[spi->chip_select])
|
|
return;
|
|
|
|
if (cs_asserted) {
|
|
/* Keep things powered as long as CS is asserted */
|
|
pm_runtime_get_sync(rs->dev);
|
|
|
|
ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER,
|
|
BIT(spi->chip_select));
|
|
} else {
|
|
ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER,
|
|
BIT(spi->chip_select));
|
|
|
|
/* Drop reference from when we first asserted CS */
|
|
pm_runtime_put(rs->dev);
|
|
}
|
|
|
|
rs->cs_asserted[spi->chip_select] = cs_asserted;
|
|
}
|
|
|
|
static int rockchip_spi_prepare_message(struct spi_master *master,
|
|
struct spi_message *msg)
|
|
{
|
|
struct rockchip_spi *rs = spi_master_get_devdata(master);
|
|
struct spi_device *spi = msg->spi;
|
|
|
|
rs->mode = spi->mode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
|
|
spin_lock_irqsave(&rs->lock, flags);
|
|
|
|
/*
|
|
* For DMA mode, we need terminate DMA channel and flush
|
|
* fifo for the next transfer if DMA thansfer timeout.
|
|
* 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) {
|
|
dmaengine_terminate_async(rs->dma_rx.ch);
|
|
flush_fifo(rs);
|
|
}
|
|
|
|
if (rs->state & TXBUSY)
|
|
dmaengine_terminate_async(rs->dma_tx.ch);
|
|
}
|
|
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
|
|
{
|
|
u32 max = tx_max(rs);
|
|
u32 txw = 0;
|
|
|
|
while (max--) {
|
|
if (rs->n_bytes == 1)
|
|
txw = *(u8 *)(rs->tx);
|
|
else
|
|
txw = *(u16 *)(rs->tx);
|
|
|
|
writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR);
|
|
rs->tx += rs->n_bytes;
|
|
}
|
|
}
|
|
|
|
static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
|
|
{
|
|
u32 max = rx_max(rs);
|
|
u32 rxw;
|
|
|
|
while (max--) {
|
|
rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
|
|
if (rs->n_bytes == 1)
|
|
*(u8 *)(rs->rx) = (u8)rxw;
|
|
else
|
|
*(u16 *)(rs->rx) = (u16)rxw;
|
|
rs->rx += rs->n_bytes;
|
|
}
|
|
}
|
|
|
|
static int rockchip_spi_pio_transfer(struct rockchip_spi *rs)
|
|
{
|
|
int remain = 0;
|
|
|
|
spi_enable_chip(rs, 1);
|
|
|
|
do {
|
|
if (rs->tx) {
|
|
remain = rs->tx_end - rs->tx;
|
|
rockchip_spi_pio_writer(rs);
|
|
}
|
|
|
|
if (rs->rx) {
|
|
remain = rs->rx_end - rs->rx;
|
|
rockchip_spi_pio_reader(rs);
|
|
}
|
|
|
|
cpu_relax();
|
|
} while (remain);
|
|
|
|
/* If tx, wait until the FIFO data completely. */
|
|
if (rs->tx)
|
|
wait_for_idle(rs);
|
|
|
|
spi_enable_chip(rs, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rockchip_spi_dma_rxcb(void *data)
|
|
{
|
|
unsigned long flags;
|
|
struct rockchip_spi *rs = data;
|
|
|
|
spin_lock_irqsave(&rs->lock, flags);
|
|
|
|
rs->state &= ~RXBUSY;
|
|
if (!(rs->state & TXBUSY)) {
|
|
spi_enable_chip(rs, 0);
|
|
spi_finalize_current_transfer(rs->master);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&rs->lock, flags);
|
|
}
|
|
|
|
static void rockchip_spi_dma_txcb(void *data)
|
|
{
|
|
unsigned long flags;
|
|
struct rockchip_spi *rs = data;
|
|
|
|
/* Wait until the FIFO data completely. */
|
|
wait_for_idle(rs);
|
|
|
|
spin_lock_irqsave(&rs->lock, flags);
|
|
|
|
rs->state &= ~TXBUSY;
|
|
if (!(rs->state & RXBUSY)) {
|
|
spi_enable_chip(rs, 0);
|
|
spi_finalize_current_transfer(rs->master);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&rs->lock, flags);
|
|
}
|
|
|
|
static int rockchip_spi_prepare_dma(struct rockchip_spi *rs)
|
|
{
|
|
unsigned long flags;
|
|
struct dma_slave_config rxconf, txconf;
|
|
struct dma_async_tx_descriptor *rxdesc, *txdesc;
|
|
|
|
memset(&rxconf, 0, sizeof(rxconf));
|
|
memset(&txconf, 0, sizeof(txconf));
|
|
|
|
spin_lock_irqsave(&rs->lock, flags);
|
|
rs->state &= ~RXBUSY;
|
|
rs->state &= ~TXBUSY;
|
|
spin_unlock_irqrestore(&rs->lock, flags);
|
|
|
|
rxdesc = NULL;
|
|
if (rs->rx) {
|
|
rxconf.direction = DMA_DEV_TO_MEM;
|
|
rxconf.src_addr = rs->dma_rx.addr;
|
|
rxconf.src_addr_width = rs->n_bytes;
|
|
rxconf.src_maxburst = 1;
|
|
dmaengine_slave_config(rs->dma_rx.ch, &rxconf);
|
|
|
|
rxdesc = dmaengine_prep_slave_sg(
|
|
rs->dma_rx.ch,
|
|
rs->rx_sg.sgl, rs->rx_sg.nents,
|
|
DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
|
|
if (!rxdesc)
|
|
return -EINVAL;
|
|
|
|
rxdesc->callback = rockchip_spi_dma_rxcb;
|
|
rxdesc->callback_param = rs;
|
|
}
|
|
|
|
txdesc = NULL;
|
|
if (rs->tx) {
|
|
txconf.direction = DMA_MEM_TO_DEV;
|
|
txconf.dst_addr = rs->dma_tx.addr;
|
|
txconf.dst_addr_width = rs->n_bytes;
|
|
txconf.dst_maxburst = rs->fifo_len / 2;
|
|
dmaengine_slave_config(rs->dma_tx.ch, &txconf);
|
|
|
|
txdesc = dmaengine_prep_slave_sg(
|
|
rs->dma_tx.ch,
|
|
rs->tx_sg.sgl, rs->tx_sg.nents,
|
|
DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
|
|
if (!txdesc) {
|
|
if (rxdesc)
|
|
dmaengine_terminate_sync(rs->dma_rx.ch);
|
|
return -EINVAL;
|
|
}
|
|
|
|
txdesc->callback = rockchip_spi_dma_txcb;
|
|
txdesc->callback_param = rs;
|
|
}
|
|
|
|
/* rx must be started before tx due to spi instinct */
|
|
if (rxdesc) {
|
|
spin_lock_irqsave(&rs->lock, flags);
|
|
rs->state |= RXBUSY;
|
|
spin_unlock_irqrestore(&rs->lock, flags);
|
|
dmaengine_submit(rxdesc);
|
|
dma_async_issue_pending(rs->dma_rx.ch);
|
|
}
|
|
|
|
spi_enable_chip(rs, 1);
|
|
|
|
if (txdesc) {
|
|
spin_lock_irqsave(&rs->lock, flags);
|
|
rs->state |= TXBUSY;
|
|
spin_unlock_irqrestore(&rs->lock, flags);
|
|
dmaengine_submit(txdesc);
|
|
dma_async_issue_pending(rs->dma_tx.ch);
|
|
}
|
|
|
|
/* 1 means the transfer is in progress */
|
|
return 1;
|
|
}
|
|
|
|
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)
|
|
| (CR0_EM_BIG << CR0_EM_OFFSET);
|
|
|
|
cr0 |= (rs->n_bytes << CR0_DFS_OFFSET);
|
|
cr0 |= ((rs->mode & 0x3) << CR0_SCPH_OFFSET);
|
|
cr0 |= (rs->tmode << CR0_XFM_OFFSET);
|
|
cr0 |= (rs->type << CR0_FRF_OFFSET);
|
|
|
|
if (rs->use_dma) {
|
|
if (rs->tx)
|
|
dmacr |= TF_DMA_EN;
|
|
if (rs->rx)
|
|
dmacr |= RF_DMA_EN;
|
|
}
|
|
|
|
if (WARN_ON(rs->speed > MAX_SCLK_OUT))
|
|
rs->speed = MAX_SCLK_OUT;
|
|
|
|
/* the minimum divisor is 2 */
|
|
if (rs->max_freq < 2 * rs->speed) {
|
|
clk_set_rate(rs->spiclk, 2 * rs->speed);
|
|
rs->max_freq = clk_get_rate(rs->spiclk);
|
|
}
|
|
|
|
/* div doesn't support odd number */
|
|
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);
|
|
|
|
if (rs->n_bytes == 1)
|
|
writel_relaxed(rs->len - 1, rs->regs + ROCKCHIP_SPI_CTRLR1);
|
|
else if (rs->n_bytes == 2)
|
|
writel_relaxed((rs->len / 2) - 1, rs->regs + ROCKCHIP_SPI_CTRLR1);
|
|
else
|
|
writel_relaxed((rs->len * 2) - 1, rs->regs + ROCKCHIP_SPI_CTRLR1);
|
|
|
|
writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_TXFTLR);
|
|
writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
|
|
|
|
writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_DMATDLR);
|
|
writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMARDLR);
|
|
writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR);
|
|
|
|
spi_set_clk(rs, div);
|
|
|
|
dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div);
|
|
}
|
|
|
|
static size_t rockchip_spi_max_transfer_size(struct spi_device *spi)
|
|
{
|
|
return ROCKCHIP_SPI_MAX_TRANLEN;
|
|
}
|
|
|
|
static int rockchip_spi_transfer_one(
|
|
struct spi_master *master,
|
|
struct spi_device *spi,
|
|
struct spi_transfer *xfer)
|
|
{
|
|
struct rockchip_spi *rs = spi_master_get_devdata(master);
|
|
|
|
WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
|
|
(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));
|
|
|
|
if (!xfer->tx_buf && !xfer->rx_buf) {
|
|
dev_err(rs->dev, "No buffer for transfer\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (xfer->len > ROCKCHIP_SPI_MAX_TRANLEN) {
|
|
dev_err(rs->dev, "Transfer is too long (%d)\n", xfer->len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rs->speed = xfer->speed_hz;
|
|
rs->bpw = xfer->bits_per_word;
|
|
rs->n_bytes = rs->bpw >> 3;
|
|
|
|
rs->tx = xfer->tx_buf;
|
|
rs->tx_end = rs->tx + xfer->len;
|
|
rs->rx = xfer->rx_buf;
|
|
rs->rx_end = rs->rx + xfer->len;
|
|
rs->len = xfer->len;
|
|
|
|
rs->tx_sg = xfer->tx_sg;
|
|
rs->rx_sg = xfer->rx_sg;
|
|
|
|
if (rs->tx && rs->rx)
|
|
rs->tmode = CR0_XFM_TR;
|
|
else if (rs->tx)
|
|
rs->tmode = CR0_XFM_TO;
|
|
else if (rs->rx)
|
|
rs->tmode = CR0_XFM_RO;
|
|
|
|
/* we need prepare dma before spi was enabled */
|
|
if (master->can_dma && master->can_dma(master, spi, xfer))
|
|
rs->use_dma = true;
|
|
else
|
|
rs->use_dma = false;
|
|
|
|
rockchip_spi_config(rs);
|
|
|
|
if (rs->use_dma)
|
|
return rockchip_spi_prepare_dma(rs);
|
|
|
|
return rockchip_spi_pio_transfer(rs);
|
|
}
|
|
|
|
static bool rockchip_spi_can_dma(struct spi_master *master,
|
|
struct spi_device *spi,
|
|
struct spi_transfer *xfer)
|
|
{
|
|
struct rockchip_spi *rs = spi_master_get_devdata(master);
|
|
|
|
return (xfer->len > rs->fifo_len);
|
|
}
|
|
|
|
static int rockchip_spi_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
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)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, master);
|
|
|
|
rs = spi_master_get_devdata(master);
|
|
|
|
/* Get basic io resource and map it */
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
rs->regs = devm_ioremap_resource(&pdev->dev, mem);
|
|
if (IS_ERR(rs->regs)) {
|
|
ret = PTR_ERR(rs->regs);
|
|
goto err_put_master;
|
|
}
|
|
|
|
rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk");
|
|
if (IS_ERR(rs->apb_pclk)) {
|
|
dev_err(&pdev->dev, "Failed to get apb_pclk\n");
|
|
ret = PTR_ERR(rs->apb_pclk);
|
|
goto err_put_master;
|
|
}
|
|
|
|
rs->spiclk = devm_clk_get(&pdev->dev, "spiclk");
|
|
if (IS_ERR(rs->spiclk)) {
|
|
dev_err(&pdev->dev, "Failed to get spi_pclk\n");
|
|
ret = PTR_ERR(rs->spiclk);
|
|
goto err_put_master;
|
|
}
|
|
|
|
ret = clk_prepare_enable(rs->apb_pclk);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to enable apb_pclk\n");
|
|
goto err_put_master;
|
|
}
|
|
|
|
ret = clk_prepare_enable(rs->spiclk);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to enable spi_clk\n");
|
|
goto err_disable_apbclk;
|
|
}
|
|
|
|
spi_enable_chip(rs, 0);
|
|
|
|
rs->type = SSI_MOTO_SPI;
|
|
rs->master = master;
|
|
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");
|
|
ret = -EINVAL;
|
|
goto err_disable_spiclk;
|
|
}
|
|
|
|
spin_lock_init(&rs->lock);
|
|
|
|
pm_runtime_set_active(&pdev->dev);
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
master->auto_runtime_pm = true;
|
|
master->bus_num = pdev->id;
|
|
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
|
|
master->num_chipselect = ROCKCHIP_SPI_MAX_CS_NUM;
|
|
master->dev.of_node = pdev->dev.of_node;
|
|
master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
|
|
|
|
master->set_cs = rockchip_spi_set_cs;
|
|
master->prepare_message = rockchip_spi_prepare_message;
|
|
master->unprepare_message = rockchip_spi_unprepare_message;
|
|
master->transfer_one = rockchip_spi_transfer_one;
|
|
master->max_transfer_size = rockchip_spi_max_transfer_size;
|
|
master->handle_err = rockchip_spi_handle_err;
|
|
master->flags = SPI_MASTER_GPIO_SS;
|
|
|
|
rs->dma_tx.ch = dma_request_chan(rs->dev, "tx");
|
|
if (IS_ERR(rs->dma_tx.ch)) {
|
|
/* Check tx to see if we need defer probing driver */
|
|
if (PTR_ERR(rs->dma_tx.ch) == -EPROBE_DEFER) {
|
|
ret = -EPROBE_DEFER;
|
|
goto err_disable_pm_runtime;
|
|
}
|
|
dev_warn(rs->dev, "Failed to request TX DMA channel\n");
|
|
rs->dma_tx.ch = NULL;
|
|
}
|
|
|
|
rs->dma_rx.ch = dma_request_chan(rs->dev, "rx");
|
|
if (IS_ERR(rs->dma_rx.ch)) {
|
|
if (PTR_ERR(rs->dma_rx.ch) == -EPROBE_DEFER) {
|
|
ret = -EPROBE_DEFER;
|
|
goto err_free_dma_tx;
|
|
}
|
|
dev_warn(rs->dev, "Failed to request RX DMA channel\n");
|
|
rs->dma_rx.ch = NULL;
|
|
}
|
|
|
|
if (rs->dma_tx.ch && rs->dma_rx.ch) {
|
|
rs->dma_tx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_TXDR);
|
|
rs->dma_rx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_RXDR);
|
|
|
|
master->can_dma = rockchip_spi_can_dma;
|
|
master->dma_tx = rs->dma_tx.ch;
|
|
master->dma_rx = rs->dma_rx.ch;
|
|
}
|
|
|
|
ret = devm_spi_register_master(&pdev->dev, master);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to register master\n");
|
|
goto err_free_dma_rx;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_free_dma_rx:
|
|
if (rs->dma_rx.ch)
|
|
dma_release_channel(rs->dma_rx.ch);
|
|
err_free_dma_tx:
|
|
if (rs->dma_tx.ch)
|
|
dma_release_channel(rs->dma_tx.ch);
|
|
err_disable_pm_runtime:
|
|
pm_runtime_disable(&pdev->dev);
|
|
err_disable_spiclk:
|
|
clk_disable_unprepare(rs->spiclk);
|
|
err_disable_apbclk:
|
|
clk_disable_unprepare(rs->apb_pclk);
|
|
err_put_master:
|
|
spi_master_put(master);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rockchip_spi_remove(struct platform_device *pdev)
|
|
{
|
|
struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
|
|
struct rockchip_spi *rs = spi_master_get_devdata(master);
|
|
|
|
pm_runtime_get_sync(&pdev->dev);
|
|
|
|
clk_disable_unprepare(rs->spiclk);
|
|
clk_disable_unprepare(rs->apb_pclk);
|
|
|
|
pm_runtime_put_noidle(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
pm_runtime_set_suspended(&pdev->dev);
|
|
|
|
if (rs->dma_tx.ch)
|
|
dma_release_channel(rs->dma_tx.ch);
|
|
if (rs->dma_rx.ch)
|
|
dma_release_channel(rs->dma_rx.ch);
|
|
|
|
spi_master_put(master);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int rockchip_spi_suspend(struct device *dev)
|
|
{
|
|
int ret;
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
struct rockchip_spi *rs = spi_master_get_devdata(master);
|
|
|
|
ret = spi_master_suspend(rs->master);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = pm_runtime_force_suspend(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
pinctrl_pm_select_sleep_state(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rockchip_spi_resume(struct device *dev)
|
|
{
|
|
int ret;
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
struct rockchip_spi *rs = spi_master_get_devdata(master);
|
|
|
|
pinctrl_pm_select_default_state(dev);
|
|
|
|
ret = pm_runtime_force_resume(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = spi_master_resume(rs->master);
|
|
if (ret < 0) {
|
|
clk_disable_unprepare(rs->spiclk);
|
|
clk_disable_unprepare(rs->apb_pclk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
#ifdef CONFIG_PM
|
|
static int rockchip_spi_runtime_suspend(struct device *dev)
|
|
{
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
struct rockchip_spi *rs = spi_master_get_devdata(master);
|
|
|
|
clk_disable_unprepare(rs->spiclk);
|
|
clk_disable_unprepare(rs->apb_pclk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rockchip_spi_runtime_resume(struct device *dev)
|
|
{
|
|
int ret;
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
struct rockchip_spi *rs = spi_master_get_devdata(master);
|
|
|
|
ret = clk_prepare_enable(rs->apb_pclk);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = clk_prepare_enable(rs->spiclk);
|
|
if (ret < 0)
|
|
clk_disable_unprepare(rs->apb_pclk);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM */
|
|
|
|
static const struct dev_pm_ops rockchip_spi_pm = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
|
|
SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
|
|
rockchip_spi_runtime_resume, NULL)
|
|
};
|
|
|
|
static const struct of_device_id rockchip_spi_dt_match[] = {
|
|
{ .compatible = "rockchip,rv1108-spi", },
|
|
{ .compatible = "rockchip,rk3036-spi", },
|
|
{ .compatible = "rockchip,rk3066-spi", },
|
|
{ .compatible = "rockchip,rk3188-spi", },
|
|
{ .compatible = "rockchip,rk3228-spi", },
|
|
{ .compatible = "rockchip,rk3288-spi", },
|
|
{ .compatible = "rockchip,rk3368-spi", },
|
|
{ .compatible = "rockchip,rk3399-spi", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);
|
|
|
|
static struct platform_driver rockchip_spi_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.pm = &rockchip_spi_pm,
|
|
.of_match_table = of_match_ptr(rockchip_spi_dt_match),
|
|
},
|
|
.probe = rockchip_spi_probe,
|
|
.remove = rockchip_spi_remove,
|
|
};
|
|
|
|
module_platform_driver(rockchip_spi_driver);
|
|
|
|
MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
|
|
MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
|
|
MODULE_LICENSE("GPL v2");
|