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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/spi/spi-stm32-qspi.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/spi/spi-stm32-qspi.c')
-rw-r--r--drivers/spi/spi-stm32-qspi.c982
1 files changed, 982 insertions, 0 deletions
diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
new file mode 100644
index 000000000..9131660c1
--- /dev/null
+++ b/drivers/spi/spi-stm32-qspi.c
@@ -0,0 +1,982 @@
+// 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/of_gpio.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_APMS BIT(22)
+#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 FCR_CSMF BIT(3)
+
+#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 {
+ 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;
+ struct completion match_completion;
+ u32 fmode;
+
+ struct dma_chan *dma_chtx;
+ struct dma_chan *dma_chrx;
+ struct completion dma_completion;
+
+ u32 cr_reg;
+ u32 dcr_reg;
+ unsigned long status_timeout;
+
+ /*
+ * 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;
+
+ cr = readl_relaxed(qspi->io_base + QSPI_CR);
+ sr = readl_relaxed(qspi->io_base + QSPI_SR);
+
+ if (cr & CR_SMIE && sr & SR_SMF) {
+ /* disable irq */
+ cr &= ~CR_SMIE;
+ writel_relaxed(cr, qspi->io_base + QSPI_CR);
+ complete(&qspi->match_completion);
+
+ return IRQ_HANDLED;
+ }
+
+ if (sr & (SR_TEF | SR_TCF)) {
+ /* disable irq */
+ 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)) &&
+ op->data.nbytes > 4)
+ 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)
+{
+ u32 cr, sr;
+ int err = 0;
+
+ if ((readl_relaxed(qspi->io_base + QSPI_SR) & SR_TCF) ||
+ qspi->fmode == CCR_FMODE_APM)
+ 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);
+ if (!err)
+ err = stm32_qspi_wait_nobusy(qspi);
+
+ return err;
+}
+
+static int stm32_qspi_wait_poll_status(struct stm32_qspi *qspi)
+{
+ u32 cr;
+
+ reinit_completion(&qspi->match_completion);
+ cr = readl_relaxed(qspi->io_base + QSPI_CR);
+ writel_relaxed(cr | CR_SMIE, qspi->io_base + QSPI_CR);
+
+ if (!wait_for_completion_timeout(&qspi->match_completion,
+ msecs_to_jiffies(qspi->status_timeout)))
+ return -ETIMEDOUT;
+
+ writel_relaxed(FCR_CSMF, qspi->io_base + QSPI_FCR);
+
+ return 0;
+}
+
+static int stm32_qspi_get_mode(u8 buswidth)
+{
+ if (buswidth == 4)
+ return CCR_BUSWIDTH_4;
+
+ return buswidth;
+}
+
+static int stm32_qspi_send(struct spi_device *spi, const struct spi_mem_op *op)
+{
+ struct stm32_qspi *qspi = spi_controller_get_devdata(spi->master);
+ struct stm32_qspi_flash *flash = &qspi->flash[spi->chip_select];
+ u32 ccr, cr;
+ int timeout, err = 0, err_poll_status = 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);
+
+ 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);
+
+ ccr = qspi->fmode;
+ ccr |= FIELD_PREP(CCR_INST_MASK, op->cmd.opcode);
+ ccr |= FIELD_PREP(CCR_IMODE_MASK,
+ stm32_qspi_get_mode(op->cmd.buswidth));
+
+ if (op->addr.nbytes) {
+ ccr |= FIELD_PREP(CCR_ADMODE_MASK,
+ stm32_qspi_get_mode(op->addr.buswidth));
+ ccr |= FIELD_PREP(CCR_ADSIZE_MASK, op->addr.nbytes - 1);
+ }
+
+ if (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(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);
+
+ if (qspi->fmode == CCR_FMODE_APM)
+ err_poll_status = stm32_qspi_wait_poll_status(qspi);
+
+ 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 || err_poll_status || qspi->fmode == CCR_FMODE_MM)
+ goto abort;
+
+ /* wait end of tx in indirect mode */
+ err = stm32_qspi_wait_cmd(qspi);
+ 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 | FCR_CSMF, qspi->io_base + QSPI_FCR);
+
+ if (err || err_poll_status || timeout)
+ dev_err(qspi->dev, "%s err:%d err_poll_status:%d abort timeout:%d\n",
+ __func__, err, err_poll_status, timeout);
+
+ return err;
+}
+
+static int stm32_qspi_poll_status(struct spi_mem *mem, const struct spi_mem_op *op,
+ u16 mask, u16 match,
+ unsigned long initial_delay_us,
+ unsigned long polling_rate_us,
+ unsigned long timeout_ms)
+{
+ struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
+ int ret;
+
+ if (!spi_mem_supports_op(mem, op))
+ return -EOPNOTSUPP;
+
+ ret = pm_runtime_resume_and_get(qspi->dev);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&qspi->lock);
+
+ writel_relaxed(mask, qspi->io_base + QSPI_PSMKR);
+ writel_relaxed(match, qspi->io_base + QSPI_PSMAR);
+ qspi->fmode = CCR_FMODE_APM;
+ qspi->status_timeout = timeout_ms;
+
+ ret = stm32_qspi_send(mem->spi, op);
+ mutex_unlock(&qspi->lock);
+
+ pm_runtime_mark_last_busy(qspi->dev);
+ pm_runtime_put_autosuspend(qspi->dev);
+
+ return ret;
+}
+
+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_resume_and_get(qspi->dev);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&qspi->lock);
+ if (op->data.dir == SPI_MEM_DATA_IN && op->data.nbytes)
+ qspi->fmode = CCR_FMODE_INDR;
+ else
+ qspi->fmode = CCR_FMODE_INDW;
+
+ ret = stm32_qspi_send(mem->spi, op);
+ mutex_unlock(&qspi->lock);
+
+ pm_runtime_mark_last_busy(qspi->dev);
+ pm_runtime_put_autosuspend(qspi->dev);
+
+ return ret;
+}
+
+static int stm32_qspi_dirmap_create(struct spi_mem_dirmap_desc *desc)
+{
+ struct stm32_qspi *qspi = spi_controller_get_devdata(desc->mem->spi->master);
+
+ if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT)
+ return -EOPNOTSUPP;
+
+ /* should never happen, as mm_base == null is an error probe exit condition */
+ if (!qspi->mm_base && desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN)
+ return -EOPNOTSUPP;
+
+ if (!qspi->mm_size)
+ return -EOPNOTSUPP;
+
+ return 0;
+}
+
+static ssize_t stm32_qspi_dirmap_read(struct spi_mem_dirmap_desc *desc,
+ u64 offs, size_t len, void *buf)
+{
+ struct stm32_qspi *qspi = spi_controller_get_devdata(desc->mem->spi->master);
+ struct spi_mem_op op;
+ u32 addr_max;
+ int ret;
+
+ ret = pm_runtime_resume_and_get(qspi->dev);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&qspi->lock);
+ /* make a local copy of desc op_tmpl and complete dirmap rdesc
+ * spi_mem_op template with offs, len and *buf in order to get
+ * all needed transfer information into struct spi_mem_op
+ */
+ memcpy(&op, &desc->info.op_tmpl, sizeof(struct spi_mem_op));
+ dev_dbg(qspi->dev, "%s len = 0x%zx offs = 0x%llx buf = 0x%p\n", __func__, len, offs, buf);
+
+ op.data.nbytes = len;
+ op.addr.val = desc->info.offset + offs;
+ op.data.buf.in = buf;
+
+ addr_max = op.addr.val + op.data.nbytes + 1;
+ if (addr_max < qspi->mm_size && op.addr.buswidth)
+ qspi->fmode = CCR_FMODE_MM;
+ else
+ qspi->fmode = CCR_FMODE_INDR;
+
+ ret = stm32_qspi_send(desc->mem->spi, &op);
+ mutex_unlock(&qspi->lock);
+
+ pm_runtime_mark_last_busy(qspi->dev);
+ pm_runtime_put_autosuspend(qspi->dev);
+
+ return ret ?: len;
+}
+
+static int stm32_qspi_transfer_one_message(struct spi_controller *ctrl,
+ struct spi_message *msg)
+{
+ struct stm32_qspi *qspi = spi_controller_get_devdata(ctrl);
+ struct spi_transfer *transfer;
+ struct spi_device *spi = msg->spi;
+ struct spi_mem_op op;
+ int ret = 0;
+
+ if (!spi->cs_gpiod)
+ return -EOPNOTSUPP;
+
+ ret = pm_runtime_resume_and_get(qspi->dev);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&qspi->lock);
+
+ gpiod_set_value_cansleep(spi->cs_gpiod, true);
+
+ list_for_each_entry(transfer, &msg->transfers, transfer_list) {
+ u8 dummy_bytes = 0;
+
+ memset(&op, 0, sizeof(op));
+
+ dev_dbg(qspi->dev, "tx_buf:%p tx_nbits:%d rx_buf:%p rx_nbits:%d len:%d dummy_data:%d\n",
+ transfer->tx_buf, transfer->tx_nbits,
+ transfer->rx_buf, transfer->rx_nbits,
+ transfer->len, transfer->dummy_data);
+
+ /*
+ * QSPI hardware supports dummy bytes transfer.
+ * If current transfer is dummy byte, merge it with the next
+ * transfer in order to take into account QSPI block constraint
+ */
+ if (transfer->dummy_data) {
+ op.dummy.buswidth = transfer->tx_nbits;
+ op.dummy.nbytes = transfer->len;
+ dummy_bytes = transfer->len;
+
+ /* if happens, means that message is not correctly built */
+ if (list_is_last(&transfer->transfer_list, &msg->transfers)) {
+ ret = -EINVAL;
+ goto end_of_transfer;
+ }
+
+ transfer = list_next_entry(transfer, transfer_list);
+ }
+
+ op.data.nbytes = transfer->len;
+
+ if (transfer->rx_buf) {
+ qspi->fmode = CCR_FMODE_INDR;
+ op.data.buswidth = transfer->rx_nbits;
+ op.data.dir = SPI_MEM_DATA_IN;
+ op.data.buf.in = transfer->rx_buf;
+ } else {
+ qspi->fmode = CCR_FMODE_INDW;
+ op.data.buswidth = transfer->tx_nbits;
+ op.data.dir = SPI_MEM_DATA_OUT;
+ op.data.buf.out = transfer->tx_buf;
+ }
+
+ ret = stm32_qspi_send(spi, &op);
+ if (ret)
+ goto end_of_transfer;
+
+ msg->actual_length += transfer->len + dummy_bytes;
+ }
+
+end_of_transfer:
+ gpiod_set_value_cansleep(spi->cs_gpiod, false);
+
+ mutex_unlock(&qspi->lock);
+
+ msg->status = ret;
+ spi_finalize_current_message(ctrl);
+
+ 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, mode;
+ int ret;
+
+ if (ctrl->busy)
+ return -EBUSY;
+
+ if (!spi->max_speed_hz)
+ return -EINVAL;
+
+ mode = spi->mode & (SPI_TX_OCTAL | SPI_RX_OCTAL);
+ if ((mode == SPI_TX_OCTAL || mode == SPI_RX_OCTAL) ||
+ ((mode == (SPI_TX_OCTAL | SPI_RX_OCTAL)) &&
+ gpiod_count(qspi->dev, "cs") == -ENOENT)) {
+ dev_err(qspi->dev, "spi-rx-bus-width\\/spi-tx-bus-width\\/cs-gpios\n");
+ dev_err(qspi->dev, "configuration not supported\n");
+
+ return -EINVAL;
+ }
+
+ ret = pm_runtime_resume_and_get(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->cs = spi->chip_select;
+ flash->presc = presc;
+
+ mutex_lock(&qspi->lock);
+ qspi->cr_reg = CR_APMS | 3 << CR_FTHRES_SHIFT | CR_SSHIFT | CR_EN;
+
+ /*
+ * Dual flash mode is only enable in case SPI_TX_OCTAL and SPI_TX_OCTAL
+ * are both set in spi->mode and "cs-gpios" properties is found in DT
+ */
+ if (mode == (SPI_TX_OCTAL | SPI_RX_OCTAL)) {
+ qspi->cr_reg |= CR_DFM;
+ dev_dbg(qspi->dev, "Dual flash mode enable");
+ }
+
+ 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,
+ .dirmap_create = stm32_qspi_dirmap_create,
+ .dirmap_read = stm32_qspi_dirmap_read,
+ .poll_status = stm32_qspi_poll_status,
+};
+
+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 = devm_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))
+ return PTR_ERR(qspi->io_base);
+
+ 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))
+ return PTR_ERR(qspi->mm_base);
+
+ qspi->mm_size = resource_size(res);
+ if (qspi->mm_size > STM32_QSPI_MAX_MMAP_SZ)
+ return -EINVAL;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ ret = devm_request_irq(dev, irq, stm32_qspi_irq, 0,
+ dev_name(dev), qspi);
+ if (ret) {
+ dev_err(dev, "failed to request irq\n");
+ return ret;
+ }
+
+ init_completion(&qspi->data_completion);
+ init_completion(&qspi->match_completion);
+
+ qspi->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(qspi->clk))
+ return PTR_ERR(qspi->clk);
+
+ qspi->clk_rate = clk_get_rate(qspi->clk);
+ if (!qspi->clk_rate)
+ return -EINVAL;
+
+ ret = clk_prepare_enable(qspi->clk);
+ if (ret) {
+ dev_err(dev, "can not enable the clock\n");
+ return ret;
+ }
+
+ rstc = devm_reset_control_get_exclusive(dev, NULL);
+ if (IS_ERR(rstc)) {
+ ret = PTR_ERR(rstc);
+ if (ret == -EPROBE_DEFER)
+ goto err_clk_disable;
+ } 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_dma_free;
+
+ mutex_init(&qspi->lock);
+
+ ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_OCTAL
+ | SPI_TX_DUAL | SPI_TX_QUAD | SPI_RX_OCTAL;
+ ctrl->setup = stm32_qspi_setup;
+ ctrl->bus_num = -1;
+ ctrl->mem_ops = &stm32_qspi_mem_ops;
+ ctrl->use_gpio_descriptors = true;
+ ctrl->transfer_one_message = stm32_qspi_transfer_one_message;
+ 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 = spi_register_master(ctrl);
+ if (ret)
+ goto err_pm_runtime_free;
+
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+
+ return 0;
+
+err_pm_runtime_free:
+ pm_runtime_get_sync(qspi->dev);
+ /* disable qspi */
+ writel_relaxed(0, qspi->io_base + QSPI_CR);
+ 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);
+err_dma_free:
+ stm32_qspi_dma_free(qspi);
+err_clk_disable:
+ clk_disable_unprepare(qspi->clk);
+
+ return ret;
+}
+
+static int stm32_qspi_remove(struct platform_device *pdev)
+{
+ struct stm32_qspi *qspi = platform_get_drvdata(pdev);
+
+ pm_runtime_get_sync(qspi->dev);
+ spi_unregister_master(qspi->ctrl);
+ /* disable qspi */
+ 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);
+
+ 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 pm_runtime_force_suspend(dev);
+}
+
+static int __maybe_unused stm32_qspi_resume(struct device *dev)
+{
+ struct stm32_qspi *qspi = dev_get_drvdata(dev);
+ int ret;
+
+ ret = pm_runtime_force_resume(dev);
+ if (ret < 0)
+ return ret;
+
+ pinctrl_pm_select_default_state(dev);
+
+ ret = pm_runtime_resume_and_get(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(dev);
+ pm_runtime_put_autosuspend(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");