769 lines
18 KiB
C
769 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) STMicroelectronics 2018 - All Rights Reserved
|
|
* Author: Ludovic Barre <ludovic.barre@st.com> for STMicroelectronics.
|
|
*/
|
|
#include <linux/bitfield.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/io.h>
|
|
#include <linux/iopoll.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/pinctrl/consumer.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reset.h>
|
|
#include <linux/sizes.h>
|
|
#include <linux/spi/spi-mem.h>
|
|
|
|
#define QSPI_CR 0x00
|
|
#define CR_EN BIT(0)
|
|
#define CR_ABORT BIT(1)
|
|
#define CR_DMAEN BIT(2)
|
|
#define CR_TCEN BIT(3)
|
|
#define CR_SSHIFT BIT(4)
|
|
#define CR_DFM BIT(6)
|
|
#define CR_FSEL BIT(7)
|
|
#define CR_FTHRES_SHIFT 8
|
|
#define CR_TEIE BIT(16)
|
|
#define CR_TCIE BIT(17)
|
|
#define CR_FTIE BIT(18)
|
|
#define CR_SMIE BIT(19)
|
|
#define CR_TOIE BIT(20)
|
|
#define CR_PRESC_MASK GENMASK(31, 24)
|
|
|
|
#define QSPI_DCR 0x04
|
|
#define DCR_FSIZE_MASK GENMASK(20, 16)
|
|
|
|
#define QSPI_SR 0x08
|
|
#define SR_TEF BIT(0)
|
|
#define SR_TCF BIT(1)
|
|
#define SR_FTF BIT(2)
|
|
#define SR_SMF BIT(3)
|
|
#define SR_TOF BIT(4)
|
|
#define SR_BUSY BIT(5)
|
|
#define SR_FLEVEL_MASK GENMASK(13, 8)
|
|
|
|
#define QSPI_FCR 0x0c
|
|
#define FCR_CTEF BIT(0)
|
|
#define FCR_CTCF BIT(1)
|
|
|
|
#define QSPI_DLR 0x10
|
|
|
|
#define QSPI_CCR 0x14
|
|
#define CCR_INST_MASK GENMASK(7, 0)
|
|
#define CCR_IMODE_MASK GENMASK(9, 8)
|
|
#define CCR_ADMODE_MASK GENMASK(11, 10)
|
|
#define CCR_ADSIZE_MASK GENMASK(13, 12)
|
|
#define CCR_DCYC_MASK GENMASK(22, 18)
|
|
#define CCR_DMODE_MASK GENMASK(25, 24)
|
|
#define CCR_FMODE_MASK GENMASK(27, 26)
|
|
#define CCR_FMODE_INDW (0U << 26)
|
|
#define CCR_FMODE_INDR (1U << 26)
|
|
#define CCR_FMODE_APM (2U << 26)
|
|
#define CCR_FMODE_MM (3U << 26)
|
|
#define CCR_BUSWIDTH_0 0x0
|
|
#define CCR_BUSWIDTH_1 0x1
|
|
#define CCR_BUSWIDTH_2 0x2
|
|
#define CCR_BUSWIDTH_4 0x3
|
|
|
|
#define QSPI_AR 0x18
|
|
#define QSPI_ABR 0x1c
|
|
#define QSPI_DR 0x20
|
|
#define QSPI_PSMKR 0x24
|
|
#define QSPI_PSMAR 0x28
|
|
#define QSPI_PIR 0x2c
|
|
#define QSPI_LPTR 0x30
|
|
|
|
#define STM32_QSPI_MAX_MMAP_SZ SZ_256M
|
|
#define STM32_QSPI_MAX_NORCHIP 2
|
|
|
|
#define STM32_FIFO_TIMEOUT_US 30000
|
|
#define STM32_BUSY_TIMEOUT_US 100000
|
|
#define STM32_ABT_TIMEOUT_US 100000
|
|
#define STM32_COMP_TIMEOUT_MS 1000
|
|
#define STM32_AUTOSUSPEND_DELAY -1
|
|
|
|
struct stm32_qspi_flash {
|
|
struct stm32_qspi *qspi;
|
|
u32 cs;
|
|
u32 presc;
|
|
};
|
|
|
|
struct stm32_qspi {
|
|
struct device *dev;
|
|
struct spi_controller *ctrl;
|
|
phys_addr_t phys_base;
|
|
void __iomem *io_base;
|
|
void __iomem *mm_base;
|
|
resource_size_t mm_size;
|
|
struct clk *clk;
|
|
u32 clk_rate;
|
|
struct stm32_qspi_flash flash[STM32_QSPI_MAX_NORCHIP];
|
|
struct completion data_completion;
|
|
u32 fmode;
|
|
|
|
struct dma_chan *dma_chtx;
|
|
struct dma_chan *dma_chrx;
|
|
struct completion dma_completion;
|
|
|
|
u32 cr_reg;
|
|
u32 dcr_reg;
|
|
|
|
/*
|
|
* to protect device configuration, could be different between
|
|
* 2 flash access (bk1, bk2)
|
|
*/
|
|
struct mutex lock;
|
|
};
|
|
|
|
static irqreturn_t stm32_qspi_irq(int irq, void *dev_id)
|
|
{
|
|
struct stm32_qspi *qspi = (struct stm32_qspi *)dev_id;
|
|
u32 cr, sr;
|
|
|
|
sr = readl_relaxed(qspi->io_base + QSPI_SR);
|
|
|
|
if (sr & (SR_TEF | SR_TCF)) {
|
|
/* disable irq */
|
|
cr = readl_relaxed(qspi->io_base + QSPI_CR);
|
|
cr &= ~CR_TCIE & ~CR_TEIE;
|
|
writel_relaxed(cr, qspi->io_base + QSPI_CR);
|
|
complete(&qspi->data_completion);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void stm32_qspi_read_fifo(u8 *val, void __iomem *addr)
|
|
{
|
|
*val = readb_relaxed(addr);
|
|
}
|
|
|
|
static void stm32_qspi_write_fifo(u8 *val, void __iomem *addr)
|
|
{
|
|
writeb_relaxed(*val, addr);
|
|
}
|
|
|
|
static int stm32_qspi_tx_poll(struct stm32_qspi *qspi,
|
|
const struct spi_mem_op *op)
|
|
{
|
|
void (*tx_fifo)(u8 *val, void __iomem *addr);
|
|
u32 len = op->data.nbytes, sr;
|
|
u8 *buf;
|
|
int ret;
|
|
|
|
if (op->data.dir == SPI_MEM_DATA_IN) {
|
|
tx_fifo = stm32_qspi_read_fifo;
|
|
buf = op->data.buf.in;
|
|
|
|
} else {
|
|
tx_fifo = stm32_qspi_write_fifo;
|
|
buf = (u8 *)op->data.buf.out;
|
|
}
|
|
|
|
while (len--) {
|
|
ret = readl_relaxed_poll_timeout_atomic(qspi->io_base + QSPI_SR,
|
|
sr, (sr & SR_FTF), 1,
|
|
STM32_FIFO_TIMEOUT_US);
|
|
if (ret) {
|
|
dev_err(qspi->dev, "fifo timeout (len:%d stat:%#x)\n",
|
|
len, sr);
|
|
return ret;
|
|
}
|
|
tx_fifo(buf++, qspi->io_base + QSPI_DR);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_qspi_tx_mm(struct stm32_qspi *qspi,
|
|
const struct spi_mem_op *op)
|
|
{
|
|
memcpy_fromio(op->data.buf.in, qspi->mm_base + op->addr.val,
|
|
op->data.nbytes);
|
|
return 0;
|
|
}
|
|
|
|
static void stm32_qspi_dma_callback(void *arg)
|
|
{
|
|
struct completion *dma_completion = arg;
|
|
|
|
complete(dma_completion);
|
|
}
|
|
|
|
static int stm32_qspi_tx_dma(struct stm32_qspi *qspi,
|
|
const struct spi_mem_op *op)
|
|
{
|
|
struct dma_async_tx_descriptor *desc;
|
|
enum dma_transfer_direction dma_dir;
|
|
struct dma_chan *dma_ch;
|
|
struct sg_table sgt;
|
|
dma_cookie_t cookie;
|
|
u32 cr, t_out;
|
|
int err;
|
|
|
|
if (op->data.dir == SPI_MEM_DATA_IN) {
|
|
dma_dir = DMA_DEV_TO_MEM;
|
|
dma_ch = qspi->dma_chrx;
|
|
} else {
|
|
dma_dir = DMA_MEM_TO_DEV;
|
|
dma_ch = qspi->dma_chtx;
|
|
}
|
|
|
|
/*
|
|
* spi_map_buf return -EINVAL if the buffer is not DMA-able
|
|
* (DMA-able: in vmalloc | kmap | virt_addr_valid)
|
|
*/
|
|
err = spi_controller_dma_map_mem_op_data(qspi->ctrl, op, &sgt);
|
|
if (err)
|
|
return err;
|
|
|
|
desc = dmaengine_prep_slave_sg(dma_ch, sgt.sgl, sgt.nents,
|
|
dma_dir, DMA_PREP_INTERRUPT);
|
|
if (!desc) {
|
|
err = -ENOMEM;
|
|
goto out_unmap;
|
|
}
|
|
|
|
cr = readl_relaxed(qspi->io_base + QSPI_CR);
|
|
|
|
reinit_completion(&qspi->dma_completion);
|
|
desc->callback = stm32_qspi_dma_callback;
|
|
desc->callback_param = &qspi->dma_completion;
|
|
cookie = dmaengine_submit(desc);
|
|
err = dma_submit_error(cookie);
|
|
if (err)
|
|
goto out;
|
|
|
|
dma_async_issue_pending(dma_ch);
|
|
|
|
writel_relaxed(cr | CR_DMAEN, qspi->io_base + QSPI_CR);
|
|
|
|
t_out = sgt.nents * STM32_COMP_TIMEOUT_MS;
|
|
if (!wait_for_completion_timeout(&qspi->dma_completion,
|
|
msecs_to_jiffies(t_out)))
|
|
err = -ETIMEDOUT;
|
|
|
|
if (err)
|
|
dmaengine_terminate_all(dma_ch);
|
|
|
|
out:
|
|
writel_relaxed(cr & ~CR_DMAEN, qspi->io_base + QSPI_CR);
|
|
out_unmap:
|
|
spi_controller_dma_unmap_mem_op_data(qspi->ctrl, op, &sgt);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int stm32_qspi_tx(struct stm32_qspi *qspi, const struct spi_mem_op *op)
|
|
{
|
|
if (!op->data.nbytes)
|
|
return 0;
|
|
|
|
if (qspi->fmode == CCR_FMODE_MM)
|
|
return stm32_qspi_tx_mm(qspi, op);
|
|
else if ((op->data.dir == SPI_MEM_DATA_IN && qspi->dma_chrx) ||
|
|
(op->data.dir == SPI_MEM_DATA_OUT && qspi->dma_chtx))
|
|
if (!stm32_qspi_tx_dma(qspi, op))
|
|
return 0;
|
|
|
|
return stm32_qspi_tx_poll(qspi, op);
|
|
}
|
|
|
|
static int stm32_qspi_wait_nobusy(struct stm32_qspi *qspi)
|
|
{
|
|
u32 sr;
|
|
|
|
return readl_relaxed_poll_timeout_atomic(qspi->io_base + QSPI_SR, sr,
|
|
!(sr & SR_BUSY), 1,
|
|
STM32_BUSY_TIMEOUT_US);
|
|
}
|
|
|
|
static int stm32_qspi_wait_cmd(struct stm32_qspi *qspi,
|
|
const struct spi_mem_op *op)
|
|
{
|
|
u32 cr, sr;
|
|
int err = 0;
|
|
|
|
if (!op->data.nbytes)
|
|
return stm32_qspi_wait_nobusy(qspi);
|
|
|
|
if (readl_relaxed(qspi->io_base + QSPI_SR) & SR_TCF)
|
|
goto out;
|
|
|
|
reinit_completion(&qspi->data_completion);
|
|
cr = readl_relaxed(qspi->io_base + QSPI_CR);
|
|
writel_relaxed(cr | CR_TCIE | CR_TEIE, qspi->io_base + QSPI_CR);
|
|
|
|
if (!wait_for_completion_timeout(&qspi->data_completion,
|
|
msecs_to_jiffies(STM32_COMP_TIMEOUT_MS))) {
|
|
err = -ETIMEDOUT;
|
|
} else {
|
|
sr = readl_relaxed(qspi->io_base + QSPI_SR);
|
|
if (sr & SR_TEF)
|
|
err = -EIO;
|
|
}
|
|
|
|
out:
|
|
/* clear flags */
|
|
writel_relaxed(FCR_CTCF | FCR_CTEF, qspi->io_base + QSPI_FCR);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int stm32_qspi_get_mode(struct stm32_qspi *qspi, u8 buswidth)
|
|
{
|
|
if (buswidth == 4)
|
|
return CCR_BUSWIDTH_4;
|
|
|
|
return buswidth;
|
|
}
|
|
|
|
static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
|
|
{
|
|
struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
|
|
struct stm32_qspi_flash *flash = &qspi->flash[mem->spi->chip_select];
|
|
u32 ccr, cr, addr_max;
|
|
int timeout, err = 0;
|
|
|
|
dev_dbg(qspi->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n",
|
|
op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
|
|
op->dummy.buswidth, op->data.buswidth,
|
|
op->addr.val, op->data.nbytes);
|
|
|
|
err = stm32_qspi_wait_nobusy(qspi);
|
|
if (err)
|
|
goto abort;
|
|
|
|
addr_max = op->addr.val + op->data.nbytes + 1;
|
|
|
|
if (op->data.dir == SPI_MEM_DATA_IN) {
|
|
if (addr_max < qspi->mm_size &&
|
|
op->addr.buswidth)
|
|
qspi->fmode = CCR_FMODE_MM;
|
|
else
|
|
qspi->fmode = CCR_FMODE_INDR;
|
|
} else {
|
|
qspi->fmode = CCR_FMODE_INDW;
|
|
}
|
|
|
|
cr = readl_relaxed(qspi->io_base + QSPI_CR);
|
|
cr &= ~CR_PRESC_MASK & ~CR_FSEL;
|
|
cr |= FIELD_PREP(CR_PRESC_MASK, flash->presc);
|
|
cr |= FIELD_PREP(CR_FSEL, flash->cs);
|
|
writel_relaxed(cr, qspi->io_base + QSPI_CR);
|
|
|
|
if (op->data.nbytes)
|
|
writel_relaxed(op->data.nbytes - 1,
|
|
qspi->io_base + QSPI_DLR);
|
|
else
|
|
qspi->fmode = CCR_FMODE_INDW;
|
|
|
|
ccr = qspi->fmode;
|
|
ccr |= FIELD_PREP(CCR_INST_MASK, op->cmd.opcode);
|
|
ccr |= FIELD_PREP(CCR_IMODE_MASK,
|
|
stm32_qspi_get_mode(qspi, op->cmd.buswidth));
|
|
|
|
if (op->addr.nbytes) {
|
|
ccr |= FIELD_PREP(CCR_ADMODE_MASK,
|
|
stm32_qspi_get_mode(qspi, op->addr.buswidth));
|
|
ccr |= FIELD_PREP(CCR_ADSIZE_MASK, op->addr.nbytes - 1);
|
|
}
|
|
|
|
if (op->dummy.buswidth && op->dummy.nbytes)
|
|
ccr |= FIELD_PREP(CCR_DCYC_MASK,
|
|
op->dummy.nbytes * 8 / op->dummy.buswidth);
|
|
|
|
if (op->data.nbytes) {
|
|
ccr |= FIELD_PREP(CCR_DMODE_MASK,
|
|
stm32_qspi_get_mode(qspi, op->data.buswidth));
|
|
}
|
|
|
|
writel_relaxed(ccr, qspi->io_base + QSPI_CCR);
|
|
|
|
if (op->addr.nbytes && qspi->fmode != CCR_FMODE_MM)
|
|
writel_relaxed(op->addr.val, qspi->io_base + QSPI_AR);
|
|
|
|
err = stm32_qspi_tx(qspi, op);
|
|
|
|
/*
|
|
* Abort in:
|
|
* -error case
|
|
* -read memory map: prefetching must be stopped if we read the last
|
|
* byte of device (device size - fifo size). like device size is not
|
|
* knows, the prefetching is always stop.
|
|
*/
|
|
if (err || qspi->fmode == CCR_FMODE_MM)
|
|
goto abort;
|
|
|
|
/* wait end of tx in indirect mode */
|
|
err = stm32_qspi_wait_cmd(qspi, op);
|
|
if (err)
|
|
goto abort;
|
|
|
|
return 0;
|
|
|
|
abort:
|
|
cr = readl_relaxed(qspi->io_base + QSPI_CR) | CR_ABORT;
|
|
writel_relaxed(cr, qspi->io_base + QSPI_CR);
|
|
|
|
/* wait clear of abort bit by hw */
|
|
timeout = readl_relaxed_poll_timeout_atomic(qspi->io_base + QSPI_CR,
|
|
cr, !(cr & CR_ABORT), 1,
|
|
STM32_ABT_TIMEOUT_US);
|
|
|
|
writel_relaxed(FCR_CTCF, qspi->io_base + QSPI_FCR);
|
|
|
|
if (err || timeout)
|
|
dev_err(qspi->dev, "%s err:%d abort timeout:%d\n",
|
|
__func__, err, timeout);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
|
|
{
|
|
struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
|
|
int ret;
|
|
|
|
ret = pm_runtime_get_sync(qspi->dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
mutex_lock(&qspi->lock);
|
|
ret = stm32_qspi_send(mem, op);
|
|
mutex_unlock(&qspi->lock);
|
|
|
|
pm_runtime_mark_last_busy(qspi->dev);
|
|
pm_runtime_put_autosuspend(qspi->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stm32_qspi_setup(struct spi_device *spi)
|
|
{
|
|
struct spi_controller *ctrl = spi->master;
|
|
struct stm32_qspi *qspi = spi_controller_get_devdata(ctrl);
|
|
struct stm32_qspi_flash *flash;
|
|
u32 presc;
|
|
int ret;
|
|
|
|
if (ctrl->busy)
|
|
return -EBUSY;
|
|
|
|
if (!spi->max_speed_hz)
|
|
return -EINVAL;
|
|
|
|
ret = pm_runtime_get_sync(qspi->dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
presc = DIV_ROUND_UP(qspi->clk_rate, spi->max_speed_hz) - 1;
|
|
|
|
flash = &qspi->flash[spi->chip_select];
|
|
flash->qspi = qspi;
|
|
flash->cs = spi->chip_select;
|
|
flash->presc = presc;
|
|
|
|
mutex_lock(&qspi->lock);
|
|
qspi->cr_reg = 3 << CR_FTHRES_SHIFT | CR_SSHIFT | CR_EN;
|
|
writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR);
|
|
|
|
/* set dcr fsize to max address */
|
|
qspi->dcr_reg = DCR_FSIZE_MASK;
|
|
writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR);
|
|
mutex_unlock(&qspi->lock);
|
|
|
|
pm_runtime_mark_last_busy(qspi->dev);
|
|
pm_runtime_put_autosuspend(qspi->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_qspi_dma_setup(struct stm32_qspi *qspi)
|
|
{
|
|
struct dma_slave_config dma_cfg;
|
|
struct device *dev = qspi->dev;
|
|
int ret = 0;
|
|
|
|
memset(&dma_cfg, 0, sizeof(dma_cfg));
|
|
|
|
dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
|
|
dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
|
|
dma_cfg.src_addr = qspi->phys_base + QSPI_DR;
|
|
dma_cfg.dst_addr = qspi->phys_base + QSPI_DR;
|
|
dma_cfg.src_maxburst = 4;
|
|
dma_cfg.dst_maxburst = 4;
|
|
|
|
qspi->dma_chrx = dma_request_chan(dev, "rx");
|
|
if (IS_ERR(qspi->dma_chrx)) {
|
|
ret = PTR_ERR(qspi->dma_chrx);
|
|
qspi->dma_chrx = NULL;
|
|
if (ret == -EPROBE_DEFER)
|
|
goto out;
|
|
} else {
|
|
if (dmaengine_slave_config(qspi->dma_chrx, &dma_cfg)) {
|
|
dev_err(dev, "dma rx config failed\n");
|
|
dma_release_channel(qspi->dma_chrx);
|
|
qspi->dma_chrx = NULL;
|
|
}
|
|
}
|
|
|
|
qspi->dma_chtx = dma_request_chan(dev, "tx");
|
|
if (IS_ERR(qspi->dma_chtx)) {
|
|
ret = PTR_ERR(qspi->dma_chtx);
|
|
qspi->dma_chtx = NULL;
|
|
} else {
|
|
if (dmaengine_slave_config(qspi->dma_chtx, &dma_cfg)) {
|
|
dev_err(dev, "dma tx config failed\n");
|
|
dma_release_channel(qspi->dma_chtx);
|
|
qspi->dma_chtx = NULL;
|
|
}
|
|
}
|
|
|
|
out:
|
|
init_completion(&qspi->dma_completion);
|
|
|
|
if (ret != -EPROBE_DEFER)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void stm32_qspi_dma_free(struct stm32_qspi *qspi)
|
|
{
|
|
if (qspi->dma_chtx)
|
|
dma_release_channel(qspi->dma_chtx);
|
|
if (qspi->dma_chrx)
|
|
dma_release_channel(qspi->dma_chrx);
|
|
}
|
|
|
|
/*
|
|
* no special host constraint, so use default spi_mem_default_supports_op
|
|
* to check supported mode.
|
|
*/
|
|
static const struct spi_controller_mem_ops stm32_qspi_mem_ops = {
|
|
.exec_op = stm32_qspi_exec_op,
|
|
};
|
|
|
|
static void stm32_qspi_release(struct stm32_qspi *qspi)
|
|
{
|
|
/* disable qspi */
|
|
pm_runtime_get_sync(qspi->dev);
|
|
writel_relaxed(0, qspi->io_base + QSPI_CR);
|
|
stm32_qspi_dma_free(qspi);
|
|
mutex_destroy(&qspi->lock);
|
|
pm_runtime_put_noidle(qspi->dev);
|
|
pm_runtime_disable(qspi->dev);
|
|
pm_runtime_set_suspended(qspi->dev);
|
|
pm_runtime_dont_use_autosuspend(qspi->dev);
|
|
clk_disable_unprepare(qspi->clk);
|
|
}
|
|
|
|
static int stm32_qspi_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct spi_controller *ctrl;
|
|
struct reset_control *rstc;
|
|
struct stm32_qspi *qspi;
|
|
struct resource *res;
|
|
int ret, irq;
|
|
|
|
ctrl = spi_alloc_master(dev, sizeof(*qspi));
|
|
if (!ctrl)
|
|
return -ENOMEM;
|
|
|
|
qspi = spi_controller_get_devdata(ctrl);
|
|
qspi->ctrl = ctrl;
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi");
|
|
qspi->io_base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(qspi->io_base)) {
|
|
ret = PTR_ERR(qspi->io_base);
|
|
goto err_master_put;
|
|
}
|
|
|
|
qspi->phys_base = res->start;
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_mm");
|
|
qspi->mm_base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(qspi->mm_base)) {
|
|
ret = PTR_ERR(qspi->mm_base);
|
|
goto err_master_put;
|
|
}
|
|
|
|
qspi->mm_size = resource_size(res);
|
|
if (qspi->mm_size > STM32_QSPI_MAX_MMAP_SZ) {
|
|
ret = -EINVAL;
|
|
goto err_master_put;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
ret = irq;
|
|
goto err_master_put;
|
|
}
|
|
|
|
ret = devm_request_irq(dev, irq, stm32_qspi_irq, 0,
|
|
dev_name(dev), qspi);
|
|
if (ret) {
|
|
dev_err(dev, "failed to request irq\n");
|
|
goto err_master_put;
|
|
}
|
|
|
|
init_completion(&qspi->data_completion);
|
|
|
|
qspi->clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(qspi->clk)) {
|
|
ret = PTR_ERR(qspi->clk);
|
|
goto err_master_put;
|
|
}
|
|
|
|
qspi->clk_rate = clk_get_rate(qspi->clk);
|
|
if (!qspi->clk_rate) {
|
|
ret = -EINVAL;
|
|
goto err_master_put;
|
|
}
|
|
|
|
ret = clk_prepare_enable(qspi->clk);
|
|
if (ret) {
|
|
dev_err(dev, "can not enable the clock\n");
|
|
goto err_master_put;
|
|
}
|
|
|
|
rstc = devm_reset_control_get_exclusive(dev, NULL);
|
|
if (IS_ERR(rstc)) {
|
|
ret = PTR_ERR(rstc);
|
|
if (ret == -EPROBE_DEFER)
|
|
goto err_qspi_release;
|
|
} else {
|
|
reset_control_assert(rstc);
|
|
udelay(2);
|
|
reset_control_deassert(rstc);
|
|
}
|
|
|
|
qspi->dev = dev;
|
|
platform_set_drvdata(pdev, qspi);
|
|
ret = stm32_qspi_dma_setup(qspi);
|
|
if (ret)
|
|
goto err_qspi_release;
|
|
|
|
mutex_init(&qspi->lock);
|
|
|
|
ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD
|
|
| SPI_TX_DUAL | SPI_TX_QUAD;
|
|
ctrl->setup = stm32_qspi_setup;
|
|
ctrl->bus_num = -1;
|
|
ctrl->mem_ops = &stm32_qspi_mem_ops;
|
|
ctrl->num_chipselect = STM32_QSPI_MAX_NORCHIP;
|
|
ctrl->dev.of_node = dev->of_node;
|
|
|
|
pm_runtime_set_autosuspend_delay(dev, STM32_AUTOSUSPEND_DELAY);
|
|
pm_runtime_use_autosuspend(dev);
|
|
pm_runtime_set_active(dev);
|
|
pm_runtime_enable(dev);
|
|
pm_runtime_get_noresume(dev);
|
|
|
|
ret = devm_spi_register_master(dev, ctrl);
|
|
if (ret)
|
|
goto err_qspi_release;
|
|
|
|
pm_runtime_mark_last_busy(dev);
|
|
pm_runtime_put_autosuspend(dev);
|
|
|
|
return 0;
|
|
|
|
err_qspi_release:
|
|
stm32_qspi_release(qspi);
|
|
err_master_put:
|
|
spi_master_put(qspi->ctrl);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stm32_qspi_remove(struct platform_device *pdev)
|
|
{
|
|
struct stm32_qspi *qspi = platform_get_drvdata(pdev);
|
|
|
|
stm32_qspi_release(qspi);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused stm32_qspi_runtime_suspend(struct device *dev)
|
|
{
|
|
struct stm32_qspi *qspi = dev_get_drvdata(dev);
|
|
|
|
clk_disable_unprepare(qspi->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused stm32_qspi_runtime_resume(struct device *dev)
|
|
{
|
|
struct stm32_qspi *qspi = dev_get_drvdata(dev);
|
|
|
|
return clk_prepare_enable(qspi->clk);
|
|
}
|
|
|
|
static int __maybe_unused stm32_qspi_suspend(struct device *dev)
|
|
{
|
|
pinctrl_pm_select_sleep_state(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused stm32_qspi_resume(struct device *dev)
|
|
{
|
|
struct stm32_qspi *qspi = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
pinctrl_pm_select_default_state(dev);
|
|
|
|
ret = pm_runtime_get_sync(qspi->dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR);
|
|
writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR);
|
|
|
|
pm_runtime_mark_last_busy(qspi->dev);
|
|
pm_runtime_put_autosuspend(qspi->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops stm32_qspi_pm_ops = {
|
|
SET_RUNTIME_PM_OPS(stm32_qspi_runtime_suspend,
|
|
stm32_qspi_runtime_resume, NULL)
|
|
SET_SYSTEM_SLEEP_PM_OPS(stm32_qspi_suspend, stm32_qspi_resume)
|
|
};
|
|
|
|
static const struct of_device_id stm32_qspi_match[] = {
|
|
{.compatible = "st,stm32f469-qspi"},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, stm32_qspi_match);
|
|
|
|
static struct platform_driver stm32_qspi_driver = {
|
|
.probe = stm32_qspi_probe,
|
|
.remove = stm32_qspi_remove,
|
|
.driver = {
|
|
.name = "stm32-qspi",
|
|
.of_match_table = stm32_qspi_match,
|
|
.pm = &stm32_qspi_pm_ops,
|
|
},
|
|
};
|
|
module_platform_driver(stm32_qspi_driver);
|
|
|
|
MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
|
|
MODULE_DESCRIPTION("STMicroelectronics STM32 quad spi driver");
|
|
MODULE_LICENSE("GPL v2");
|