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spi: spi-zynqmp-gqspi: Update driver to use spi-mem framework

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Updated Zynqmp qspi controller driver to use spi-mem framework.

Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/490a7642a975f4d3dd9618304e9e45f7e2414661.1600931476.git.michal.simek@xilinx.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Amit Kumar Mahapatra 2020-09-24 09:11:18 +02:00 committed by Mark Brown
parent 91af6eb04a
commit 1c26372e5a
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 369 additions and 276 deletions
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645
drivers/spi/spi-zynqmp-gqspi.c
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@ -21,6 +21,7 @@
#include <linux/spi/spi.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/spi/spi-mem.h>
/* Generic QSPI register offsets */
#define GQSPI_CONFIG_OFST 0x00000100
@ -153,6 +154,7 @@ enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
* @dma_addr: DMA address after mapping the kernel buffer
* @genfifoentry: Used for storing the genfifoentry instruction.
* @mode: Defines the mode in which QSPI is operating
* @data_completion: completion structure
*/
struct zynqmp_qspi {
void __iomem *regs;
@ -170,6 +172,7 @@ struct zynqmp_qspi {
dma_addr_t dma_addr;
u32 genfifoentry;
enum mode_type mode;
struct completion data_completion;
};
/**
@ -344,40 +347,6 @@ static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi,
xqspi->bytes_to_receive -= size;
}
/**
* zynqmp_prepare_transfer_hardware - Prepares hardware for transfer.
* @master: Pointer to the spi_master structure which provides
* information about the controller.
*
* This function enables SPI master controller.
*
* Return: 0 on success; error value otherwise
*/
static int zynqmp_prepare_transfer_hardware(struct spi_master *master)
{
struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
return 0;
}
/**
* zynqmp_unprepare_transfer_hardware - Relaxes hardware after transfer
* @master: Pointer to the spi_master structure which provides
* information about the controller.
*
* This function disables the SPI master controller.
*
* Return: Always 0
*/
static int zynqmp_unprepare_transfer_hardware(struct spi_master *master)
{
struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
return 0;
}
/**
* zynqmp_qspi_chipselect - Select or deselect the chip select line
* @qspi: Pointer to the spi_device structure
@ -387,12 +356,14 @@ static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
{
struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master);
ulong timeout;
u32 genfifoentry = 0x0, statusreg;
u32 genfifoentry = 0, statusreg;
genfifoentry |= GQSPI_GENFIFO_MODE_SPI;
genfifoentry |= xqspi->genfifobus;
if (!is_high) {
xqspi->genfifobus = GQSPI_GENFIFO_BUS_LOWER;
xqspi->genfifocs = GQSPI_GENFIFO_CS_LOWER;
genfifoentry |= xqspi->genfifobus;
genfifoentry |= xqspi->genfifocs;
genfifoentry |= GQSPI_GENFIFO_CS_SETUP;
} else {
@ -424,11 +395,38 @@ static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
}
/**
* zynqmp_qspi_setup_transfer - Configure QSPI controller for specified
* zynqmp_qspi_selectspimode - Selects SPI mode - x1 or x2 or x4.
* @xqspi: xqspi is a pointer to the GQSPI instance
* @spimode: spimode - SPI or DUAL or QUAD.
* Return: Mask to set desired SPI mode in GENFIFO entry.
*/
static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi,
u8 spimode)
{
u32 mask = 0;
switch (spimode) {
case GQSPI_SELECT_MODE_DUALSPI:
mask = GQSPI_GENFIFO_MODE_DUALSPI;
break;
case GQSPI_SELECT_MODE_QUADSPI:
mask = GQSPI_GENFIFO_MODE_QUADSPI;
break;
case GQSPI_SELECT_MODE_SPI:
mask = GQSPI_GENFIFO_MODE_SPI;
break;
default:
dev_warn(xqspi->dev, "Invalid SPI mode\n");
}
return mask;
}
/**
* zynqmp_qspi_config_op - Configure QSPI controller for specified
* transfer
* @xqspi: Pointer to the zynqmp_qspi structure
* @qspi: Pointer to the spi_device structure
* @transfer: Pointer to the spi_transfer structure which provides
* information about next transfer setup parameters
*
* Sets the operational mode of QSPI controller for the next QSPI transfer and
* sets the requested clock frequency.
@ -445,17 +443,11 @@ static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
* by the QSPI controller the driver will set the highest or lowest
* frequency supported by controller.
*/
static int zynqmp_qspi_setup_transfer(struct spi_device *qspi,
struct spi_transfer *transfer)
static int zynqmp_qspi_config_op(struct zynqmp_qspi *xqspi,
struct spi_device *qspi)
{
struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master);
ulong clk_rate;
u32 config_reg, req_hz, baud_rate_val = 0;
if (transfer)
req_hz = transfer->speed_hz;
else
req_hz = qspi->max_speed_hz;
u32 config_reg, baud_rate_val = 0;
/* Set the clock frequency */
/* If req_hz == 0, default to lowest speed */
@ -463,7 +455,7 @@ static int zynqmp_qspi_setup_transfer(struct spi_device *qspi,
while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
(clk_rate /
(GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > req_hz)
(GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > qspi->max_speed_hz)
baud_rate_val++;
config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
@ -483,7 +475,7 @@ static int zynqmp_qspi_setup_transfer(struct spi_device *qspi,
}
/**
* zynqmp_qspi_setup - Configure the QSPI controller
* zynqmp_qspi_setup_op - Configure the QSPI controller
* @qspi: Pointer to the spi_device structure
*
* Sets the operational mode of QSPI controller for the next QSPI transfer,
@ -491,10 +483,30 @@ static int zynqmp_qspi_setup_transfer(struct spi_device *qspi,
*
* Return: 0 on success; error value otherwise.
*/
static int zynqmp_qspi_setup(struct spi_device *qspi)
static int zynqmp_qspi_setup_op(struct spi_device *qspi)
{
if (qspi->master->busy)
struct spi_controller *ctlr = qspi->master;
struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr);
struct device *dev = &ctlr->dev;
int ret;
if (ctlr->busy)
return -EBUSY;
ret = clk_enable(xqspi->refclk);
if (ret) {
dev_err(dev, "Cannot enable device clock.\n");
return ret;
}
ret = clk_enable(xqspi->pclk);
if (ret) {
dev_err(dev, "Cannot enable APB clock.\n");
clk_disable(xqspi->refclk);
return ret;
}
zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
return 0;
}
@ -552,6 +564,75 @@ static void zynqmp_qspi_readrxfifo(struct zynqmp_qspi *xqspi, u32 size)
}
}
/**
* zynqmp_qspi_fillgenfifo - Fills the GENFIFO.
* @xqspi: Pointer to the zynqmp_qspi structure
* @nbits: Transfer/Receive buswidth.
* @genfifoentry: Variable in which GENFIFO mask is saved
*/
static void zynqmp_qspi_fillgenfifo(struct zynqmp_qspi *xqspi, u8 nbits,
u32 genfifoentry)
{
u32 transfer_len = 0;
if (xqspi->txbuf) {
genfifoentry &= ~GQSPI_GENFIFO_RX;
genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
genfifoentry |= GQSPI_GENFIFO_TX;
transfer_len = xqspi->bytes_to_transfer;
} else {
genfifoentry &= ~GQSPI_GENFIFO_TX;
genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
genfifoentry |= GQSPI_GENFIFO_RX;
if (xqspi->mode == GQSPI_MODE_DMA)
transfer_len = xqspi->dma_rx_bytes;
else
transfer_len = xqspi->bytes_to_receive;
}
genfifoentry |= zynqmp_qspi_selectspimode(xqspi, nbits);
xqspi->genfifoentry = genfifoentry;
if ((transfer_len) < GQSPI_GENFIFO_IMM_DATA_MASK) {
genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
genfifoentry |= transfer_len;
zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
} else {
int tempcount = transfer_len;
u32 exponent = 8; /* 2^8 = 256 */
u8 imm_data = tempcount & 0xFF;
tempcount &= ~(tempcount & 0xFF);
/* Immediate entry */
if (tempcount != 0) {
/* Exponent entries */
genfifoentry |= GQSPI_GENFIFO_EXP;
while (tempcount != 0) {
if (tempcount & GQSPI_GENFIFO_EXP_START) {
genfifoentry &=
~GQSPI_GENFIFO_IMM_DATA_MASK;
genfifoentry |= exponent;
zynqmp_gqspi_write(xqspi,
GQSPI_GEN_FIFO_OFST,
genfifoentry);
}
tempcount = tempcount >> 1;
exponent++;
}
}
if (imm_data != 0) {
genfifoentry &= ~GQSPI_GENFIFO_EXP;
genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
genfifoentry |= (u8)(imm_data & 0xFF);
zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST,
genfifoentry);
}
}
if (xqspi->mode == GQSPI_MODE_IO && xqspi->rxbuf) {
/* Dummy generic FIFO entry */
zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
}
}
/**
* zynqmp_process_dma_irq - Handler for DMA done interrupt of QSPI
* controller
@ -614,9 +695,8 @@ static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi)
*/
static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
{
struct spi_master *master = dev_id;
struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
int ret = IRQ_NONE;
struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_id;
irqreturn_t ret = IRQ_NONE;
u32 status, mask, dma_status = 0;
status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
@ -648,45 +728,17 @@ static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
if ((xqspi->bytes_to_receive == 0) && (xqspi->bytes_to_transfer == 0)
&& ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) {
zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK);
spi_finalize_current_transfer(master);
complete(&xqspi->data_completion);
ret = IRQ_HANDLED;
}
return ret;
}
/**
* zynqmp_qspi_selectspimode - Selects SPI mode - x1 or x2 or x4.
* @xqspi: xqspi is a pointer to the GQSPI instance
* @spimode: spimode - SPI or DUAL or QUAD.
* Return: Mask to set desired SPI mode in GENFIFO entry.
*/
static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi,
u8 spimode)
{
u32 mask = 0;
switch (spimode) {
case GQSPI_SELECT_MODE_DUALSPI:
mask = GQSPI_GENFIFO_MODE_DUALSPI;
break;
case GQSPI_SELECT_MODE_QUADSPI:
mask = GQSPI_GENFIFO_MODE_QUADSPI;
break;
case GQSPI_SELECT_MODE_SPI:
mask = GQSPI_GENFIFO_MODE_SPI;
break;
default:
dev_warn(xqspi->dev, "Invalid SPI mode\n");
}
return mask;
}
/**
* zynq_qspi_setuprxdma - This function sets up the RX DMA operation
* zynqmp_qspi_setuprxdma - This function sets up the RX DMA operation
* @xqspi: xqspi is a pointer to the GQSPI instance.
*/
static void zynq_qspi_setuprxdma(struct zynqmp_qspi *xqspi)
static void zynqmp_qspi_setuprxdma(struct zynqmp_qspi *xqspi)
{
u32 rx_bytes, rx_rem, config_reg;
dma_addr_t addr;
@ -733,162 +785,44 @@ static void zynq_qspi_setuprxdma(struct zynqmp_qspi *xqspi)
}
/**
* zynqmp_qspi_txrxsetup - This function checks the TX/RX buffers in
* the transfer and sets up the GENFIFO entries,
* TX FIFO as required.
* @xqspi: xqspi is a pointer to the GQSPI instance.
* @transfer: It is a pointer to the structure containing transfer data.
* @genfifoentry: genfifoentry is pointer to the variable in which
* GENFIFO mask is returned to calling function
* zynqmp_qspi_write_op - This function sets up the GENFIFO entries,
* TX FIFO, and fills the TX FIFO with as many
* bytes as possible.
* @xqspi: Pointer to the GQSPI instance.
* @tx_nbits: Transfer buswidth.
* @genfifoentry: Variable in which GENFIFO mask is returned
* to calling function
*/
static void zynqmp_qspi_txrxsetup(struct zynqmp_qspi *xqspi,
struct spi_transfer *transfer,
u32 *genfifoentry)
static void zynqmp_qspi_write_op(struct zynqmp_qspi *xqspi, u8 tx_nbits,
u32 genfifoentry)
{
u32 config_reg;
/* Transmit */
if ((xqspi->txbuf != NULL) && (xqspi->rxbuf == NULL)) {
/* Setup data to be TXed */
*genfifoentry &= ~GQSPI_GENFIFO_RX;
*genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
*genfifoentry |= GQSPI_GENFIFO_TX;
*genfifoentry |=
zynqmp_qspi_selectspimode(xqspi, transfer->tx_nbits);
xqspi->bytes_to_transfer = transfer->len;
if (xqspi->mode == GQSPI_MODE_DMA) {
config_reg = zynqmp_gqspi_read(xqspi,
GQSPI_CONFIG_OFST);
config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
config_reg);
xqspi->mode = GQSPI_MODE_IO;
}
zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH);
/* Discard RX data */
xqspi->bytes_to_receive = 0;
} else if ((xqspi->txbuf == NULL) && (xqspi->rxbuf != NULL)) {
/* Receive */
/* TX auto fill */
*genfifoentry &= ~GQSPI_GENFIFO_TX;
/* Setup RX */
*genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
*genfifoentry |= GQSPI_GENFIFO_RX;
*genfifoentry |=
zynqmp_qspi_selectspimode(xqspi, transfer->rx_nbits);
xqspi->bytes_to_transfer = 0;
xqspi->bytes_to_receive = transfer->len;
zynq_qspi_setuprxdma(xqspi);
zynqmp_qspi_fillgenfifo(xqspi, tx_nbits, genfifoentry);
zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH);
if (xqspi->mode == GQSPI_MODE_DMA) {
config_reg = zynqmp_gqspi_read(xqspi,
GQSPI_CONFIG_OFST);
config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
config_reg);
xqspi->mode = GQSPI_MODE_IO;
}
}
/**
* zynqmp_qspi_start_transfer - Initiates the QSPI transfer
* @master: Pointer to the spi_master structure which provides
* information about the controller.
* @qspi: Pointer to the spi_device structure
* @transfer: Pointer to the spi_transfer structure which provide information
* about next transfer parameters
*
* This function fills the TX FIFO, starts the QSPI transfer, and waits for the
* transfer to be completed.
*
* Return: Number of bytes transferred in the last transfer
* zynqmp_qspi_read_op - This function sets up the GENFIFO entries and
* RX DMA operation.
* @xqspi: xqspi is a pointer to the GQSPI instance.
* @rx_nbits: Receive buswidth.
* @genfifoentry: genfifoentry is pointer to the variable in which
* GENFIFO mask is returned to calling function
*/
static int zynqmp_qspi_start_transfer(struct spi_master *master,
struct spi_device *qspi,
struct spi_transfer *transfer)
static void zynqmp_qspi_read_op(struct zynqmp_qspi *xqspi, u8 rx_nbits,
u32 genfifoentry)
{
struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
u32 genfifoentry = 0x0, transfer_len;
xqspi->txbuf = transfer->tx_buf;
xqspi->rxbuf = transfer->rx_buf;
zynqmp_qspi_setup_transfer(qspi, transfer);
genfifoentry |= xqspi->genfifocs;
genfifoentry |= xqspi->genfifobus;
zynqmp_qspi_txrxsetup(xqspi, transfer, &genfifoentry);
if (xqspi->mode == GQSPI_MODE_DMA)
transfer_len = xqspi->dma_rx_bytes;
else
transfer_len = transfer->len;
xqspi->genfifoentry = genfifoentry;
if ((transfer_len) < GQSPI_GENFIFO_IMM_DATA_MASK) {
genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
genfifoentry |= transfer_len;
zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
} else {
int tempcount = transfer_len;
u32 exponent = 8; /* 2^8 = 256 */
u8 imm_data = tempcount & 0xFF;
tempcount &= ~(tempcount & 0xFF);
/* Immediate entry */
if (tempcount != 0) {
/* Exponent entries */
genfifoentry |= GQSPI_GENFIFO_EXP;
while (tempcount != 0) {
if (tempcount & GQSPI_GENFIFO_EXP_START) {
genfifoentry &=
~GQSPI_GENFIFO_IMM_DATA_MASK;
genfifoentry |= exponent;
zynqmp_gqspi_write(xqspi,
GQSPI_GEN_FIFO_OFST,
genfifoentry);
}
tempcount = tempcount >> 1;
exponent++;
}
}
if (imm_data != 0) {
genfifoentry &= ~GQSPI_GENFIFO_EXP;
genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
genfifoentry |= (u8) (imm_data & 0xFF);
zynqmp_gqspi_write(xqspi,
GQSPI_GEN_FIFO_OFST, genfifoentry);
}
}
if ((xqspi->mode == GQSPI_MODE_IO) &&
(xqspi->rxbuf != NULL)) {
/* Dummy generic FIFO entry */
zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
}
/* Since we are using manual mode */
zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
GQSPI_CFG_START_GEN_FIFO_MASK);
if (xqspi->txbuf != NULL)
/* Enable interrupts for TX */
zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
GQSPI_IER_TXEMPTY_MASK |
GQSPI_IER_GENFIFOEMPTY_MASK |
GQSPI_IER_TXNOT_FULL_MASK);
if (xqspi->rxbuf != NULL) {
/* Enable interrupts for RX */
if (xqspi->mode == GQSPI_MODE_DMA) {
/* Enable DMA interrupts */
zynqmp_gqspi_write(xqspi,
GQSPI_QSPIDMA_DST_I_EN_OFST,
GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
} else {
zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
GQSPI_IER_GENFIFOEMPTY_MASK |
GQSPI_IER_RXNEMPTY_MASK |
GQSPI_IER_RXEMPTY_MASK);
}
}
return transfer->len;
zynqmp_qspi_fillgenfifo(xqspi, rx_nbits, genfifoentry);
zynqmp_qspi_setuprxdma(xqspi);
}
/**
@ -901,11 +835,12 @@ static int zynqmp_qspi_start_transfer(struct spi_master *master,
*/
static int __maybe_unused zynqmp_qspi_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct spi_controller *ctlr = dev_get_drvdata(dev);
struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr);
spi_master_suspend(master);
spi_controller_suspend(ctlr);
zynqmp_unprepare_transfer_hardware(master);
zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
return 0;
}
@ -921,8 +856,8 @@ static int __maybe_unused zynqmp_qspi_suspend(struct device *dev)
*/
static int __maybe_unused zynqmp_qspi_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
struct spi_controller *ctlr = dev_get_drvdata(dev);
struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr);
int ret = 0;
ret = clk_enable(xqspi->pclk);
@ -938,7 +873,7 @@ static int __maybe_unused zynqmp_qspi_resume(struct device *dev)
return ret;
}
spi_master_resume(master);
spi_controller_resume(ctlr);
clk_disable(xqspi->refclk);
clk_disable(xqspi->pclk);
@ -955,8 +890,7 @@ static int __maybe_unused zynqmp_qspi_resume(struct device *dev)
*/
static int __maybe_unused zynqmp_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_get_drvdata(dev);
clk_disable(xqspi->refclk);
clk_disable(xqspi->pclk);
@ -974,8 +908,7 @@ static int __maybe_unused zynqmp_runtime_suspend(struct device *dev)
*/
static int __maybe_unused zynqmp_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_get_drvdata(dev);
int ret;
ret = clk_enable(xqspi->pclk);
@ -994,12 +927,177 @@ static int __maybe_unused zynqmp_runtime_resume(struct device *dev)
return 0;
}
/**
* zynqmp_qspi_exec_op() - Initiates the QSPI transfer
* @mem: The SPI memory
* @op: The memory operation to execute
*
* Executes a memory operation.
*
* This function first selects the chip and starts the memory operation.
*
* Return: 0 in case of success, a negative error code otherwise.
*/
static int zynqmp_qspi_exec_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
struct zynqmp_qspi *xqspi = spi_controller_get_devdata
(mem->spi->master);
int err = 0, i;
u8 *tmpbuf;
u32 genfifoentry = 0;
dev_dbg(xqspi->dev, "cmd:%#x mode:%d.%d.%d.%d\n",
op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
op->dummy.buswidth, op->data.buswidth);
zynqmp_qspi_config_op(xqspi, mem->spi);
zynqmp_qspi_chipselect(mem->spi, false);
genfifoentry |= xqspi->genfifocs;
genfifoentry |= xqspi->genfifobus;
if (op->cmd.opcode) {
tmpbuf = kzalloc(op->cmd.nbytes, GFP_KERNEL | GFP_DMA);
if (!tmpbuf)
return -ENOMEM;
tmpbuf[0] = op->cmd.opcode;
reinit_completion(&xqspi->data_completion);
xqspi->txbuf = tmpbuf;
xqspi->rxbuf = NULL;
xqspi->bytes_to_transfer = op->cmd.nbytes;
xqspi->bytes_to_receive = 0;
zynqmp_qspi_write_op(xqspi, op->cmd.buswidth, genfifoentry);
zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
GQSPI_CFG_START_GEN_FIFO_MASK);
zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
GQSPI_IER_GENFIFOEMPTY_MASK |
GQSPI_IER_TXNOT_FULL_MASK);
if (!wait_for_completion_interruptible_timeout
(&xqspi->data_completion, msecs_to_jiffies(1000))) {
err = -ETIMEDOUT;
kfree(tmpbuf);
goto return_err;
}
kfree(tmpbuf);
}
if (op->addr.nbytes) {
for (i = 0; i < op->addr.nbytes; i++) {
*(((u8 *)xqspi->txbuf) + i) = op->addr.val >>
(8 * (op->addr.nbytes - i - 1));
}
reinit_completion(&xqspi->data_completion);
xqspi->rxbuf = NULL;
xqspi->bytes_to_transfer = op->addr.nbytes;
xqspi->bytes_to_receive = 0;
zynqmp_qspi_write_op(xqspi, op->addr.buswidth, genfifoentry);
zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
zynqmp_gqspi_read(xqspi,
GQSPI_CONFIG_OFST) |
GQSPI_CFG_START_GEN_FIFO_MASK);
zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
GQSPI_IER_TXEMPTY_MASK |
GQSPI_IER_GENFIFOEMPTY_MASK |
GQSPI_IER_TXNOT_FULL_MASK);
if (!wait_for_completion_interruptible_timeout
(&xqspi->data_completion, msecs_to_jiffies(1000))) {
err = -ETIMEDOUT;
goto return_err;
}
}
if (op->dummy.nbytes) {
tmpbuf = kzalloc(op->dummy.nbytes, GFP_KERNEL | GFP_DMA);
if (!tmpbuf)
return -ENOMEM;
memset(tmpbuf, 0xff, op->dummy.nbytes);
reinit_completion(&xqspi->data_completion);
xqspi->txbuf = tmpbuf;
xqspi->rxbuf = NULL;
xqspi->bytes_to_transfer = op->dummy.nbytes;
xqspi->bytes_to_receive = 0;
zynqmp_qspi_write_op(xqspi, op->dummy.buswidth,
genfifoentry);
zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
GQSPI_CFG_START_GEN_FIFO_MASK);
zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
GQSPI_IER_TXEMPTY_MASK |
GQSPI_IER_GENFIFOEMPTY_MASK |
GQSPI_IER_TXNOT_FULL_MASK);
if (!wait_for_completion_interruptible_timeout
(&xqspi->data_completion, msecs_to_jiffies(1000))) {
err = -ETIMEDOUT;
kfree(tmpbuf);
goto return_err;
}
kfree(tmpbuf);
}
if (op->data.nbytes) {
reinit_completion(&xqspi->data_completion);
if (op->data.dir == SPI_MEM_DATA_OUT) {
xqspi->txbuf = (u8 *)op->data.buf.out;
xqspi->rxbuf = NULL;
xqspi->bytes_to_transfer = op->data.nbytes;
xqspi->bytes_to_receive = 0;
zynqmp_qspi_write_op(xqspi, op->data.buswidth,
genfifoentry);
zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
zynqmp_gqspi_read
(xqspi, GQSPI_CONFIG_OFST) |
GQSPI_CFG_START_GEN_FIFO_MASK);
zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
GQSPI_IER_TXEMPTY_MASK |
GQSPI_IER_GENFIFOEMPTY_MASK |
GQSPI_IER_TXNOT_FULL_MASK);
} else {
xqspi->txbuf = NULL;
xqspi->rxbuf = (u8 *)op->data.buf.in;
xqspi->bytes_to_receive = op->data.nbytes;
xqspi->bytes_to_transfer = 0;
zynqmp_qspi_read_op(xqspi, op->data.buswidth,
genfifoentry);
zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
zynqmp_gqspi_read
(xqspi, GQSPI_CONFIG_OFST) |
GQSPI_CFG_START_GEN_FIFO_MASK);
if (xqspi->mode == GQSPI_MODE_DMA) {
zynqmp_gqspi_write
(xqspi, GQSPI_QSPIDMA_DST_I_EN_OFST,
GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
} else {
zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
GQSPI_IER_GENFIFOEMPTY_MASK |
GQSPI_IER_RXNEMPTY_MASK |
GQSPI_IER_RXEMPTY_MASK);
}
}
if (!wait_for_completion_interruptible_timeout
(&xqspi->data_completion, msecs_to_jiffies(1000)))
err = -ETIMEDOUT;
}
return_err:
zynqmp_qspi_chipselect(mem->spi, true);
return err;
}
static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = {
SET_RUNTIME_PM_OPS(zynqmp_runtime_suspend,
zynqmp_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(zynqmp_qspi_suspend, zynqmp_qspi_resume)
};
static const struct spi_controller_mem_ops zynqmp_qspi_mem_ops = {
.exec_op = zynqmp_qspi_exec_op,
};
/**
* zynqmp_qspi_probe - Probe method for the QSPI driver
* @pdev: Pointer to the platform_device structure
@ -1011,17 +1109,18 @@ static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = {
static int zynqmp_qspi_probe(struct platform_device *pdev)
{
int ret = 0;
struct spi_master *master;
struct spi_controller *ctlr;
struct zynqmp_qspi *xqspi;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
master = spi_alloc_master(&pdev->dev, sizeof(*xqspi));
if (!master)
ctlr = spi_alloc_master(&pdev->dev, sizeof(*xqspi));
if (!ctlr)
return -ENOMEM;
xqspi = spi_master_get_devdata(master);
master->dev.of_node = pdev->dev.of_node;
platform_set_drvdata(pdev, master);
xqspi = spi_controller_get_devdata(ctlr);
xqspi->dev = dev;
platform_set_drvdata(pdev, xqspi);
xqspi->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(xqspi->regs)) {
@ -1029,7 +1128,6 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
goto remove_master;
}
xqspi->dev = dev;
xqspi->pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(xqspi->pclk)) {
dev_err(dev, "pclk clock not found.\n");
@ -1037,11 +1135,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
goto remove_master;
}
ret = clk_prepare_enable(xqspi->pclk);
if (ret) {
dev_err(dev, "Unable to enable APB clock.\n");
goto remove_master;
}
init_completion(&xqspi->data_completion);
xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk");
if (IS_ERR(xqspi->refclk)) {
@ -1050,6 +1144,12 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
goto clk_dis_pclk;
}
ret = clk_prepare_enable(xqspi->pclk);
if (ret) {
dev_err(dev, "Unable to enable APB clock.\n");
goto remove_master;
}
ret = clk_prepare_enable(xqspi->refclk);
if (ret) {
dev_err(dev, "Unable to enable device clock.\n");
@ -1071,32 +1171,28 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
goto clk_dis_all;
}
ret = devm_request_irq(&pdev->dev, xqspi->irq, zynqmp_qspi_irq,
0, pdev->name, master);
0, pdev->name, xqspi);
if (ret != 0) {
ret = -ENXIO;
dev_err(dev, "request_irq failed\n");
goto clk_dis_all;
}
master->num_chipselect = GQSPI_DEFAULT_NUM_CS;
master->setup = zynqmp_qspi_setup;
master->set_cs = zynqmp_qspi_chipselect;
master->transfer_one = zynqmp_qspi_start_transfer;
master->prepare_transfer_hardware = zynqmp_prepare_transfer_hardware;
master->unprepare_transfer_hardware =
zynqmp_unprepare_transfer_hardware;
master->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
ctlr->num_chipselect = GQSPI_DEFAULT_NUM_CS;
ctlr->mem_ops = &zynqmp_qspi_mem_ops;
ctlr->setup = zynqmp_qspi_setup_op;
ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
SPI_TX_DUAL | SPI_TX_QUAD;
ctlr->dev.of_node = np;
if (master->dev.parent == NULL)
master->dev.parent = &master->dev;
ret = spi_register_master(master);
if (ret)
ret = devm_spi_register_controller(&pdev->dev, ctlr);
if (ret) {
dev_err(&pdev->dev, "spi_register_controller failed\n");
goto clk_dis_all;
}
return 0;
@ -1107,7 +1203,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
clk_dis_pclk:
clk_disable_unprepare(xqspi->pclk);
remove_master:
spi_master_put(master);
spi_controller_put(ctlr);
return ret;
}
@ -1124,8 +1220,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
*/
static int zynqmp_qspi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
struct zynqmp_qspi *xqspi = platform_get_drvdata(pdev);
zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
clk_disable_unprepare(xqspi->refclk);
@ -1133,8 +1228,6 @@ static int zynqmp_qspi_remove(struct platform_device *pdev)
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_disable(&pdev->dev);
spi_unregister_master(master);
return 0;
}