[PATCH 2/3] spi: stm32_qspi: Add transfer_one_message() spi callback

[<patrice.chotard@xxxxxxxxxxx>]

From: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>

Add transfer_one_message() spi callback in order to use the QSPI interface
as a communication channel using up to 8 qspi lines (QSPI configured
in dual flash mode).

Signed-off-by: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
---
 drivers/spi/spi-stm32-qspi.c | 111 ++++++++++++++++++++++++++++++++---
 1 file changed, 104 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
index f3fe92300639..7f2cdcbaf853 100644
--- a/drivers/spi/spi-stm32-qspi.c
+++ b/drivers/spi/spi-stm32-qspi.c
@@ -15,6 +15,7 @@
 #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>
@@ -355,10 +356,10 @@ static int stm32_qspi_get_mode(u8 buswidth)
 	return buswidth;
 }
 
-static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
+static int stm32_qspi_send(struct spi_device *spi, 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];
+	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;
 
@@ -465,7 +466,7 @@ static int stm32_qspi_poll_status(struct spi_mem *mem, const struct spi_mem_op *
 	qspi->fmode = CCR_FMODE_APM;
 	qspi->status_timeout = timeout_ms;
 
-	ret = stm32_qspi_send(mem, op);
+	ret = stm32_qspi_send(mem->spi, op);
 	mutex_unlock(&qspi->lock);
 
 	pm_runtime_mark_last_busy(qspi->dev);
@@ -489,7 +490,7 @@ static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 	else
 		qspi->fmode = CCR_FMODE_INDW;
 
-	ret = stm32_qspi_send(mem, op);
+	ret = stm32_qspi_send(mem->spi, op);
 	mutex_unlock(&qspi->lock);
 
 	pm_runtime_mark_last_busy(qspi->dev);
@@ -545,7 +546,7 @@ static ssize_t stm32_qspi_dirmap_read(struct spi_mem_dirmap_desc *desc,
 	else
 		qspi->fmode = CCR_FMODE_INDR;
 
-	ret = stm32_qspi_send(desc->mem, &op);
+	ret = stm32_qspi_send(desc->mem->spi, &op);
 	mutex_unlock(&qspi->lock);
 
 	pm_runtime_mark_last_busy(qspi->dev);
@@ -554,6 +555,90 @@ static ssize_t stm32_qspi_dirmap_read(struct spi_mem_dirmap_desc *desc,
 	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;
+
+	if (!spi->cs_gpiod)
+		return -EOPNOTSUPP;
+
+	ret = pm_runtime_get_sync(qspi->dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(qspi->dev);
+		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))
+				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);
+
+	pm_runtime_mark_last_busy(qspi->dev);
+	pm_runtime_put_autosuspend(qspi->dev);
+
+	msg->status = ret;
+	spi_finalize_current_message(ctrl);
+
+	return ret;
+}
+
 static int stm32_qspi_setup(struct spi_device *spi)
 {
 	struct spi_controller *ctrl = spi->master;
@@ -579,7 +664,7 @@ static int stm32_qspi_setup(struct spi_device *spi)
 	flash->presc = presc;
 
 	mutex_lock(&qspi->lock);
-	qspi->cr_reg = CR_APMS | 3 << CR_FTHRES_SHIFT | CR_SSHIFT | CR_EN;
+	qspi->cr_reg |= CR_APMS | 3 << CR_FTHRES_SHIFT | CR_SSHIFT | CR_EN;
 	writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR);
 
 	/* set dcr fsize to max address */
@@ -741,11 +826,23 @@ static int stm32_qspi_probe(struct platform_device *pdev)
 
 	mutex_init(&qspi->lock);
 
+	/*
+	 * Dual flash mode is only enable in case "st,dual-flash" and
+	 * "cs-gpios" properties are found in DT
+	 */
+	if (of_property_read_bool(dev->of_node, "st,dual-flash") &&
+	    of_gpio_named_count(dev->of_node, "cs-gpios")) {
+		qspi->cr_reg = CR_DFM;
+		dev_dbg(dev, "Dual flash mode enable");
+	}
+
 	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->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;
 
-- 
2.25.1