Merge tag 'spi-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi updates from Mark Brown:
 "With the exception of some refactoring to fix long standing issues
  where we weren't handling cache syncs properly for messages which had
  PIO and DMA transfers going to the same page correctly there has been
  no work on the core this time around, and it's also been quite a quiet
  release for the drivers too:

   - Fix cache syncs for cases where we have DMA and PIO transfers in
     the same message going to the same page

   - Update the fsl_spi driver to use transfer_one() rather than a
     custom transfer function

   - Support for configuring transfer speeds with the AMD SPI controller

   - Support for a second chip select and 64K erase on Intel SPI

   - Support for Microchip coreQSPI, Nuvoton NPCM845, NXP i.MX93, and
     Rockchip RK3128 and RK3588"

* tag 'spi-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (73 commits)
  spi: Ensure that sg_table won't be used after being freed
  spi: spi-gxp: Use devm_platform_ioremap_resource()
  spi: s3c64xx: Fix large transfers with DMA
  spi: Split transfers larger than max size
  spi: Fix cache corruption due to DMA/PIO overlap
  spi: Save current RX and TX DMA devices
  spi: mt65xx: Add dma max segment size declaration
  spi: migrate mt7621 text bindings to YAML
  spi: renesas,sh-msiof: Add r8a779g0 support
  spi: spi-fsl-qspi: Use devm_platform_ioremap_resource_byname()
  spi: spi-fsl-lpspi: Use devm_platform_get_and_ioremap_resource()
  spi: spi-fsl-dspi: Use devm_platform_get_and_ioremap_resource()
  spi/omap100k:Fix PM disable depth imbalance in omap1_spi100k_probe
  spi: dw: Fix PM disable depth imbalance in dw_spi_bt1_probe
  spi: cadence-quadspi: Fix PM disable depth imbalance in cqspi_probe
  spi: s3c24xx: Switch to use devm_spi_alloc_master()
  spi: xilinx: Switch to use devm_spi_alloc_master()
  spi: img-spfi: using pm_runtime_resume_and_get instead of pm_runtime_get_sync
  spi: aspeed: Remove redundant dev_err call
  spi: spi-mpc52xx: switch to using gpiod API
  ...

1 files changed, 139 insertions, 44 deletions

diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c
index 08df4f8d0531..e23121456c70 100644
--- a/drivers/spi/spi-amd.c
+++ b/drivers/spi/spi-amd.c
@@ -36,9 +36,17 @@
 #define AMD_SPI_FIFO_SIZE	70
 #define AMD_SPI_MEM_SIZE	200
 
-/* M_CMD OP codes for SPI */
-#define AMD_SPI_XFER_TX		1
-#define AMD_SPI_XFER_RX		2
+#define AMD_SPI_ENA_REG		0x20
+#define AMD_SPI_ALT_SPD_SHIFT	20
+#define AMD_SPI_ALT_SPD_MASK	GENMASK(23, AMD_SPI_ALT_SPD_SHIFT)
+#define AMD_SPI_SPI100_SHIFT	0
+#define AMD_SPI_SPI100_MASK	GENMASK(AMD_SPI_SPI100_SHIFT, AMD_SPI_SPI100_SHIFT)
+#define AMD_SPI_SPEED_REG	0x6C
+#define AMD_SPI_SPD7_SHIFT	8
+#define AMD_SPI_SPD7_MASK	GENMASK(13, AMD_SPI_SPD7_SHIFT)
+
+#define AMD_SPI_MAX_HZ		100000000
+#define AMD_SPI_MIN_HZ		800000
 
 /**
  * enum amd_spi_versions - SPI controller versions
@@ -50,14 +58,41 @@ enum amd_spi_versions {
 	AMD_SPI_V2,
 };
 
+enum amd_spi_speed {
+	F_66_66MHz,
+	F_33_33MHz,
+	F_22_22MHz,
+	F_16_66MHz,
+	F_100MHz,
+	F_800KHz,
+	SPI_SPD7,
+	F_50MHz = 0x4,
+	F_4MHz = 0x32,
+	F_3_17MHz = 0x3F
+};
+
+/**
+ * struct amd_spi_freq - Matches device speed with values to write in regs
+ * @speed_hz: Device frequency
+ * @enable_val: Value to be written to "enable register"
+ * @spd7_val: Some frequencies requires to have a value written at SPISPEED register
+ */
+struct amd_spi_freq {
+	u32 speed_hz;
+	u32 enable_val;
+	u32 spd7_val;
+};
+
 /**
  * struct amd_spi - SPI driver instance
  * @io_remap_addr:	Start address of the SPI controller registers
  * @version:		SPI controller hardware version
+ * @speed_hz:		Device frequency
  */
 struct amd_spi {
 	void __iomem *io_remap_addr;
 	enum amd_spi_versions version;
+	unsigned int speed_hz;
 };
 
 static inline u8 amd_spi_readreg8(struct amd_spi *amd_spi, int idx)
@@ -189,65 +224,125 @@ static int amd_spi_master_setup(struct spi_device *spi)
 	return 0;
 }
 
+static const struct amd_spi_freq amd_spi_freq[] = {
+	{ AMD_SPI_MAX_HZ,   F_100MHz,         0},
+	{       66660000, F_66_66MHz,         0},
+	{       50000000,   SPI_SPD7,   F_50MHz},
+	{       33330000, F_33_33MHz,         0},
+	{       22220000, F_22_22MHz,         0},
+	{       16660000, F_16_66MHz,         0},
+	{        4000000,   SPI_SPD7,    F_4MHz},
+	{        3170000,   SPI_SPD7, F_3_17MHz},
+	{ AMD_SPI_MIN_HZ,   F_800KHz,         0},
+};
+
+static int amd_set_spi_freq(struct amd_spi *amd_spi, u32 speed_hz)
+{
+	unsigned int i, spd7_val, alt_spd;
+
+	if (speed_hz < AMD_SPI_MIN_HZ)
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(amd_spi_freq); i++)
+		if (speed_hz >= amd_spi_freq[i].speed_hz)
+			break;
+
+	if (amd_spi->speed_hz == amd_spi_freq[i].speed_hz)
+		return 0;
+
+	amd_spi->speed_hz = amd_spi_freq[i].speed_hz;
+
+	alt_spd = (amd_spi_freq[i].enable_val << AMD_SPI_ALT_SPD_SHIFT)
+		   & AMD_SPI_ALT_SPD_MASK;
+	amd_spi_setclear_reg32(amd_spi, AMD_SPI_ENA_REG, alt_spd,
+			       AMD_SPI_ALT_SPD_MASK);
+
+	if (amd_spi->speed_hz == AMD_SPI_MAX_HZ)
+		amd_spi_setclear_reg32(amd_spi, AMD_SPI_ENA_REG, 1,
+				       AMD_SPI_SPI100_MASK);
+
+	if (amd_spi_freq[i].spd7_val) {
+		spd7_val = (amd_spi_freq[i].spd7_val << AMD_SPI_SPD7_SHIFT)
+			    & AMD_SPI_SPD7_MASK;
+		amd_spi_setclear_reg32(amd_spi, AMD_SPI_SPEED_REG, spd7_val,
+				       AMD_SPI_SPD7_MASK);
+	}
+
+	return 0;
+}
+
 static inline int amd_spi_fifo_xfer(struct amd_spi *amd_spi,
 				    struct spi_master *master,
 				    struct spi_message *message)
 {
 	struct spi_transfer *xfer = NULL;
-	u8 cmd_opcode;
+	struct spi_device *spi = message->spi;
+	u8 cmd_opcode = 0, fifo_pos = AMD_SPI_FIFO_BASE;
 	u8 *buf = NULL;
-	u32 m_cmd = 0;
 	u32 i = 0;
 	u32 tx_len = 0, rx_len = 0;
 
 	list_for_each_entry(xfer, &message->transfers,
 			    transfer_list) {
-		if (xfer->rx_buf)
-			m_cmd = AMD_SPI_XFER_RX;
-		if (xfer->tx_buf)
-			m_cmd = AMD_SPI_XFER_TX;
+		if (xfer->speed_hz)
+			amd_set_spi_freq(amd_spi, xfer->speed_hz);
+		else
+			amd_set_spi_freq(amd_spi, spi->max_speed_hz);
 
-		if (m_cmd & AMD_SPI_XFER_TX) {
+		if (xfer->tx_buf) {
 			buf = (u8 *)xfer->tx_buf;
-			tx_len = xfer->len - 1;
-			cmd_opcode = *(u8 *)xfer->tx_buf;
-			buf++;
-			amd_spi_set_opcode(amd_spi, cmd_opcode);
+			if (!tx_len) {
+				cmd_opcode = *(u8 *)xfer->tx_buf;
+				buf++;
+				xfer->len--;
+			}
+			tx_len += xfer->len;
 
 			/* Write data into the FIFO. */
-			for (i = 0; i < tx_len; i++) {
-				iowrite8(buf[i], ((u8 __iomem *)amd_spi->io_remap_addr +
-					 AMD_SPI_FIFO_BASE + i));
-			}
+			for (i = 0; i < xfer->len; i++)
+				amd_spi_writereg8(amd_spi, fifo_pos + i, buf[i]);
 
-			amd_spi_set_tx_count(amd_spi, tx_len);
-			amd_spi_clear_fifo_ptr(amd_spi);
-			/* Execute command */
-			amd_spi_execute_opcode(amd_spi);
-		}
-		if (m_cmd & AMD_SPI_XFER_RX) {
-			/*
-			 * Store no. of bytes to be received from
-			 * FIFO
-			 */
-			rx_len = xfer->len;
-			buf = (u8 *)xfer->rx_buf;
-			amd_spi_set_rx_count(amd_spi, rx_len);
-			amd_spi_clear_fifo_ptr(amd_spi);
-			/* Execute command */
-			amd_spi_execute_opcode(amd_spi);
-			amd_spi_busy_wait(amd_spi);
-			/* Read data from FIFO to receive buffer  */
-			for (i = 0; i < rx_len; i++)
-				buf[i] = amd_spi_readreg8(amd_spi, AMD_SPI_FIFO_BASE + tx_len + i);
+			fifo_pos += xfer->len;
 		}
+
+		/* Store no. of bytes to be received from FIFO */
+		if (xfer->rx_buf)
+			rx_len += xfer->len;
+	}
+
+	if (!buf) {
+		message->status = -EINVAL;
+		goto fin_msg;
+	}
+
+	amd_spi_set_opcode(amd_spi, cmd_opcode);
+	amd_spi_set_tx_count(amd_spi, tx_len);
+	amd_spi_set_rx_count(amd_spi, rx_len);
+
+	/* Execute command */
+	message->status = amd_spi_execute_opcode(amd_spi);
+	if (message->status)
+		goto fin_msg;
+
+	if (rx_len) {
+		message->status = amd_spi_busy_wait(amd_spi);
+		if (message->status)
+			goto fin_msg;
+
+		list_for_each_entry(xfer, &message->transfers, transfer_list)
+			if (xfer->rx_buf) {
+				buf = (u8 *)xfer->rx_buf;
+				/* Read data from FIFO to receive buffer */
+				for (i = 0; i < xfer->len; i++)
+					buf[i] = amd_spi_readreg8(amd_spi, fifo_pos + i);
+				fifo_pos += xfer->len;
+			}
 	}
 
 	/* Update statistics */
 	message->actual_length = tx_len + rx_len + 1;
-	/* complete the transaction */
-	message->status = 0;
 
+fin_msg:
 	switch (amd_spi->version) {
 	case AMD_SPI_V1:
 		break;
@@ -260,7 +355,7 @@ static inline int amd_spi_fifo_xfer(struct amd_spi *amd_spi,
 
 	spi_finalize_current_message(master);
 
-	return 0;
+	return message->status;
 }
 
 static int amd_spi_master_transfer(struct spi_master *master,
@@ -275,9 +370,7 @@ static int amd_spi_master_transfer(struct spi_master *master,
 	 * Extract spi_transfers from the spi message and
 	 * program the controller.
 	 */
-	amd_spi_fifo_xfer(amd_spi, master, msg);
-
-	return 0;
+	return amd_spi_fifo_xfer(amd_spi, master, msg);
 }
 
 static size_t amd_spi_max_transfer_size(struct spi_device *spi)
@@ -312,6 +405,8 @@ static int amd_spi_probe(struct platform_device *pdev)
 	master->num_chipselect = 4;
 	master->mode_bits = 0;
 	master->flags = SPI_MASTER_HALF_DUPLEX;
+	master->max_speed_hz = AMD_SPI_MAX_HZ;
+	master->min_speed_hz = AMD_SPI_MIN_HZ;
 	master->setup = amd_spi_master_setup;
 	master->transfer_one_message = amd_spi_master_transfer;
 	master->max_transfer_size = amd_spi_max_transfer_size;