Merge remote-tracking branches 'spi/topic/mem' and 'spi/topic/mtd' into spi-next

drivers/mtd/spi-nor/Kconfig

@@ -39,15 +39,6 @@ config SPI_ASPEED_SMC
 	  and support for the SPI flash memory controller (SPI) for
 	  the host firmware. The implementation only supports SPI NOR.
 
-config SPI_ATMEL_QUADSPI
-	tristate "Atmel Quad SPI Controller"
-	depends on ARCH_AT91 || (ARM && COMPILE_TEST)
-	depends on OF && HAS_IOMEM
-	help
-	  This enables support for the Quad SPI controller in master mode.
-	  This driver does not support generic SPI. The implementation only
-	  supports SPI NOR.
-
 config SPI_CADENCE_QUADSPI
 	tristate "Cadence Quad SPI controller"
 	depends on OF && (ARM || ARM64 || COMPILE_TEST)

drivers/mtd/spi-nor/Makefile

 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_MTD_SPI_NOR)	+= spi-nor.o
 obj-$(CONFIG_SPI_ASPEED_SMC)	+= aspeed-smc.o
-obj-$(CONFIG_SPI_ATMEL_QUADSPI)	+= atmel-quadspi.o
 obj-$(CONFIG_SPI_CADENCE_QUADSPI)	+= cadence-quadspi.o
 obj-$(CONFIG_SPI_FSL_QUADSPI)	+= fsl-quadspi.o
 obj-$(CONFIG_SPI_HISI_SFC)	+= hisi-sfc.o

drivers/spi/Kconfig

@@ -91,6 +91,15 @@ config SPI_AT91_USART
 	  This selects a driver for the AT91 USART Controller as SPI Master,
 	  present on AT91 and SAMA5 SoC series.
 
+config SPI_ATMEL_QUADSPI
+	tristate "Atmel Quad SPI Controller"
+	depends on ARCH_AT91 || (ARM && COMPILE_TEST && !ARCH_EBSA110)
+	depends on OF && HAS_IOMEM
+	help
+	  This enables support for the Quad SPI controller in master mode.
+	  This driver does not support generic SPI. The implementation only
+	  supports spi-mem interface.
+
 config SPI_AU1550
 	tristate "Au1550/Au1200/Au1300 SPI Controller"
 	depends on MIPS_ALCHEMY

drivers/spi/Makefile

@@ -16,6 +16,7 @@ obj-$(CONFIG_SPI_LOOPBACK_TEST)		+= spi-loopback-test.o
 obj-$(CONFIG_SPI_ALTERA)		+= spi-altera.o
 obj-$(CONFIG_SPI_ARMADA_3700)		+= spi-armada-3700.o
 obj-$(CONFIG_SPI_ATMEL)			+= spi-atmel.o
+obj-$(CONFIG_SPI_ATMEL_QUADSPI)		+= atmel-quadspi.o
 obj-$(CONFIG_SPI_AT91_USART)		+= spi-at91-usart.o
 obj-$(CONFIG_SPI_ATH79)			+= spi-ath79.o
 obj-$(CONFIG_SPI_AU1550)		+= spi-au1550.o

drivers/mtd/spi-nor/atmel-quadspi.c → drivers/spi/atmel-quadspi.c

@@ -2,8 +2,10 @@
  * Driver for Atmel QSPI Controller
  *
  * Copyright (C) 2015 Atmel Corporation
+ * Copyright (C) 2018 Cryptera A/S
  *
  * Author: Cyrille Pitchen <cyrille.pitchen@atmel.com>
+ * Author: Piotr Bugalski <bugalski.piotr@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -27,14 +29,10 @@
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/partitions.h>
-#include <linux/mtd/spi-nor.h>
-#include <linux/platform_data/atmel.h>
 #include <linux/of.h>
 
 #include <linux/io.h>
-#include <linux/gpio/consumer.h>
+#include <linux/spi/spi-mem.h>
 
 /* QSPI register offsets */
 #define QSPI_CR      0x0000  /* Control Register */
@@ -67,7 +65,7 @@
 #define QSPI_CR_LASTXFER                BIT(24)
 
 /* Bitfields in QSPI_MR (Mode Register) */
-#define QSPI_MR_SSM                     BIT(0)
+#define QSPI_MR_SMM                     BIT(0)
 #define QSPI_MR_LLB                     BIT(1)
 #define QSPI_MR_WDRBT                   BIT(2)
 #define QSPI_MR_SMRM                    BIT(3)
@@ -157,33 +155,24 @@ struct atmel_qspi {
 	struct clk		*clk;
 	struct platform_device	*pdev;
 	u32			pending;
-
-	struct spi_nor		nor;
-	u32			clk_rate;
 	struct completion	cmd_completion;
 };
 
-struct atmel_qspi_command {
-	union {
-		struct {
-			u32	instruction:1;
-			u32	address:3;
-			u32	mode:1;
-			u32	dummy:1;
-			u32	data:1;
-			u32	reserved:25;
-		}		bits;
-		u32	word;
-	}	enable;
-	u8	instruction;
-	u8	mode;
-	u8	num_mode_cycles;
-	u8	num_dummy_cycles;
-	u32	address;
-
-	size_t		buf_len;
-	const void	*tx_buf;
-	void		*rx_buf;
+struct qspi_mode {
+	u8 cmd_buswidth;
+	u8 addr_buswidth;
+	u8 data_buswidth;
+	u32 config;
+};
+
+static const struct qspi_mode sama5d2_qspi_modes[] = {
+	{ 1, 1, 1, QSPI_IFR_WIDTH_SINGLE_BIT_SPI },
+	{ 1, 1, 2, QSPI_IFR_WIDTH_DUAL_OUTPUT },
+	{ 1, 1, 4, QSPI_IFR_WIDTH_QUAD_OUTPUT },
+	{ 1, 2, 2, QSPI_IFR_WIDTH_DUAL_IO },
+	{ 1, 4, 4, QSPI_IFR_WIDTH_QUAD_IO },
+	{ 2, 2, 2, QSPI_IFR_WIDTH_DUAL_CMD },
+	{ 4, 4, 4, QSPI_IFR_WIDTH_QUAD_CMD },
 };
 
 /* Register access functions */
@@ -197,246 +186,140 @@ static inline void qspi_writel(struct atmel_qspi *aq, u32 reg, u32 value)
 	writel_relaxed(value, aq->regs + reg);
 }
 
-static int atmel_qspi_run_transfer(struct atmel_qspi *aq,
-				   const struct atmel_qspi_command *cmd)
+static inline bool is_compatible(const struct spi_mem_op *op,
+				 const struct qspi_mode *mode)
 {
-	void __iomem *ahb_mem;
-
-	/* Then fallback to a PIO transfer (memcpy() DOES NOT work!) */
-	ahb_mem = aq->mem;
-	if (cmd->enable.bits.address)
-		ahb_mem += cmd->address;
-	if (cmd->tx_buf)
-		_memcpy_toio(ahb_mem, cmd->tx_buf, cmd->buf_len);
-	else
-		_memcpy_fromio(cmd->rx_buf, ahb_mem, cmd->buf_len);
+	if (op->cmd.buswidth != mode->cmd_buswidth)
+		return false;
 
-	return 0;
-}
-
-#ifdef DEBUG
-static void atmel_qspi_debug_command(struct atmel_qspi *aq,
-				     const struct atmel_qspi_command *cmd,
-				     u32 ifr)
-{
-	u8 cmd_buf[SPI_NOR_MAX_CMD_SIZE];
-	size_t len = 0;
-	int i;
+	if (op->addr.nbytes && op->addr.buswidth != mode->addr_buswidth)
+		return false;
 
-	if (cmd->enable.bits.instruction)
-		cmd_buf[len++] = cmd->instruction;
+	if (op->data.nbytes && op->data.buswidth != mode->data_buswidth)
+		return false;
 
-	for (i = cmd->enable.bits.address-1; i >= 0; --i)
-		cmd_buf[len++] = (cmd->address >> (i << 3)) & 0xff;
+	return true;
+}
 
-	if (cmd->enable.bits.mode)
-		cmd_buf[len++] = cmd->mode;
+static int find_mode(const struct spi_mem_op *op)
+{
+	u32 i;
 
-	if (cmd->enable.bits.dummy) {
-		int num = cmd->num_dummy_cycles;
+	for (i = 0; i < ARRAY_SIZE(sama5d2_qspi_modes); i++)
+		if (is_compatible(op, &sama5d2_qspi_modes[i]))
+			return i;
 
-		switch (ifr & QSPI_IFR_WIDTH_MASK) {
-		case QSPI_IFR_WIDTH_SINGLE_BIT_SPI:
-		case QSPI_IFR_WIDTH_DUAL_OUTPUT:
-		case QSPI_IFR_WIDTH_QUAD_OUTPUT:
-			num >>= 3;
-			break;
-		case QSPI_IFR_WIDTH_DUAL_IO:
-		case QSPI_IFR_WIDTH_DUAL_CMD:
-			num >>= 2;
-			break;
-		case QSPI_IFR_WIDTH_QUAD_IO:
-		case QSPI_IFR_WIDTH_QUAD_CMD:
-			num >>= 1;
-			break;
-		default:
-			return;
-		}
+	return -1;
+}
 
-		for (i = 0; i < num; ++i)
-			cmd_buf[len++] = 0;
-	}
+static bool atmel_qspi_supports_op(struct spi_mem *mem,
+				   const struct spi_mem_op *op)
+{
+	if (find_mode(op) < 0)
+		return false;
 
-	/* Dump the SPI command */
-	print_hex_dump(KERN_DEBUG, "qspi cmd: ", DUMP_PREFIX_NONE,
-		       32, 1, cmd_buf, len, false);
+	/* special case not supported by hardware */
+	if (op->addr.nbytes == 2 && op->cmd.buswidth != op->addr.buswidth &&
+		op->dummy.nbytes == 0)
+		return false;
 
-#ifdef VERBOSE_DEBUG
-	/* If verbose debug is enabled, also dump the TX data */
-	if (cmd->enable.bits.data && cmd->tx_buf)
-		print_hex_dump(KERN_DEBUG, "qspi tx : ", DUMP_PREFIX_NONE,
-			       32, 1, cmd->tx_buf, cmd->buf_len, false);
-#endif
+	return true;
 }
-#else
-#define atmel_qspi_debug_command(aq, cmd, ifr)
-#endif
 
-static int atmel_qspi_run_command(struct atmel_qspi *aq,
-				  const struct atmel_qspi_command *cmd,
-				  u32 ifr_tfrtyp, enum spi_nor_protocol proto)
+static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 {
+	struct atmel_qspi *aq = spi_controller_get_devdata(mem->spi->master);
+	int mode;
+	u32 dummy_cycles = 0;
 	u32 iar, icr, ifr, sr;
 	int err = 0;
 
 	iar = 0;
-	icr = 0;
-	ifr = ifr_tfrtyp;
-
-	/* Set the SPI protocol */
-	switch (proto) {
-	case SNOR_PROTO_1_1_1:
-		ifr |= QSPI_IFR_WIDTH_SINGLE_BIT_SPI;
-		break;
-
-	case SNOR_PROTO_1_1_2:
-		ifr |= QSPI_IFR_WIDTH_DUAL_OUTPUT;
-		break;
+	icr = QSPI_ICR_INST(op->cmd.opcode);
+	ifr = QSPI_IFR_INSTEN;
 
-	case SNOR_PROTO_1_1_4:
-		ifr |= QSPI_IFR_WIDTH_QUAD_OUTPUT;
-		break;
+	qspi_writel(aq, QSPI_MR, QSPI_MR_SMM);
 
-	case SNOR_PROTO_1_2_2:
-		ifr |= QSPI_IFR_WIDTH_DUAL_IO;
-		break;
+	mode = find_mode(op);
+	if (mode < 0)
+		return -ENOTSUPP;
 
-	case SNOR_PROTO_1_4_4:
-		ifr |= QSPI_IFR_WIDTH_QUAD_IO;
-		break;
+	ifr |= sama5d2_qspi_modes[mode].config;
 
-	case SNOR_PROTO_2_2_2:
-		ifr |= QSPI_IFR_WIDTH_DUAL_CMD;
-		break;
+	if (op->dummy.buswidth && op->dummy.nbytes)
+		dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth;
 
-	case SNOR_PROTO_4_4_4:
-		ifr |= QSPI_IFR_WIDTH_QUAD_CMD;
-		break;
-
-	default:
-		return -EINVAL;
-	}
-
-	/* Compute instruction parameters */
-	if (cmd->enable.bits.instruction) {
-		icr |= QSPI_ICR_INST(cmd->instruction);
-		ifr |= QSPI_IFR_INSTEN;
-	}
-
-	/* Compute address parameters */
-	switch (cmd->enable.bits.address) {
-	case 4:
-		ifr |= QSPI_IFR_ADDRL;
-		/* fall through to the 24bit (3 byte) address case. */
-	case 3:
-		iar = (cmd->enable.bits.data) ? 0 : cmd->address;
-		ifr |= QSPI_IFR_ADDREN;
-		break;
+	if (op->addr.buswidth) {
+		switch (op->addr.nbytes) {
 		case 0:
 			break;
-	default:
-		return -EINVAL;
-	}
-
-	/* Compute option parameters */
-	if (cmd->enable.bits.mode && cmd->num_mode_cycles) {
-		u32 mode_cycle_bits, mode_bits;
-
-		icr |= QSPI_ICR_OPT(cmd->mode);
-		ifr |= QSPI_IFR_OPTEN;
-
-		switch (ifr & QSPI_IFR_WIDTH_MASK) {
-		case QSPI_IFR_WIDTH_SINGLE_BIT_SPI:
-		case QSPI_IFR_WIDTH_DUAL_OUTPUT:
-		case QSPI_IFR_WIDTH_QUAD_OUTPUT:
-			mode_cycle_bits = 1;
-			break;
-		case QSPI_IFR_WIDTH_DUAL_IO:
-		case QSPI_IFR_WIDTH_DUAL_CMD:
-			mode_cycle_bits = 2;
-			break;
-		case QSPI_IFR_WIDTH_QUAD_IO:
-		case QSPI_IFR_WIDTH_QUAD_CMD:
-			mode_cycle_bits = 4;
-			break;
-		default:
-			return -EINVAL;
-		}
-
-		mode_bits = cmd->num_mode_cycles * mode_cycle_bits;
-		switch (mode_bits) {
 		case 1:
-			ifr |= QSPI_IFR_OPTL_1BIT;
+			ifr |= QSPI_IFR_OPTEN | QSPI_IFR_OPTL_8BIT;
+			icr |= QSPI_ICR_OPT(op->addr.val & 0xff);
 			break;
-
 		case 2:
-			ifr |= QSPI_IFR_OPTL_2BIT;
+			if (dummy_cycles < 8 / op->addr.buswidth) {
+				ifr &= ~QSPI_IFR_INSTEN;
+				ifr |= QSPI_IFR_ADDREN;
+				iar = (op->cmd.opcode << 16) |
+					(op->addr.val & 0xffff);
+			} else {
+				ifr |= QSPI_IFR_ADDREN;
+				iar = (op->addr.val << 8) & 0xffffff;
+				dummy_cycles -= 8 / op->addr.buswidth;
+			}
 			break;
-
-		case 4:
-			ifr |= QSPI_IFR_OPTL_4BIT;
+		case 3:
+			ifr |= QSPI_IFR_ADDREN;
+			iar = op->addr.val & 0xffffff;
 			break;
-
-		case 8:
-			ifr |= QSPI_IFR_OPTL_8BIT;
+		case 4:
+			ifr |= QSPI_IFR_ADDREN | QSPI_IFR_ADDRL;
+			iar = op->addr.val & 0x7ffffff;
 			break;
-
 		default:
-			return -EINVAL;
+			return -ENOTSUPP;
 		}
 	}
 
 	/* Set number of dummy cycles */
-	if (cmd->enable.bits.dummy)
-		ifr |= QSPI_IFR_NBDUM(cmd->num_dummy_cycles);
+	if (dummy_cycles)
+		ifr |= QSPI_IFR_NBDUM(dummy_cycles);
 
 	/* Set data enable */
-	if (cmd->enable.bits.data) {
+	if (op->data.nbytes)
 		ifr |= QSPI_IFR_DATAEN;
 
-		/* Special case for Continuous Read Mode */
-		if (!cmd->tx_buf && !cmd->rx_buf)
-			ifr |= QSPI_IFR_CRM;
-	}
+	if (op->data.dir == SPI_MEM_DATA_IN && op->data.nbytes)
+		ifr |= QSPI_IFR_TFRTYP_TRSFR_READ;
+	else
+		ifr |= QSPI_IFR_TFRTYP_TRSFR_WRITE;
 
 	/* Clear pending interrupts */
 	(void)qspi_readl(aq, QSPI_SR);
 
 	/* Set QSPI Instruction Frame registers */
-	atmel_qspi_debug_command(aq, cmd, ifr);
 	qspi_writel(aq, QSPI_IAR, iar);
 	qspi_writel(aq, QSPI_ICR, icr);
 	qspi_writel(aq, QSPI_IFR, ifr);
 
 	/* Skip to the final steps if there is no data */
-	if (!cmd->enable.bits.data)
-		goto no_data;
-
+	if (op->data.nbytes) {
 		/* Dummy read of QSPI_IFR to synchronize APB and AHB accesses */
 		(void)qspi_readl(aq, QSPI_IFR);
 
-	/* Stop here for continuous read */
-	if (!cmd->tx_buf && !cmd->rx_buf)
-		return 0;
 		/* Send/Receive data */
-	err = atmel_qspi_run_transfer(aq, cmd);
+		if (op->data.dir == SPI_MEM_DATA_IN)
+			_memcpy_fromio(op->data.buf.in,
+				aq->mem + iar, op->data.nbytes);
+		else
+			_memcpy_toio(aq->mem + iar,
+				op->data.buf.out, op->data.nbytes);
 
 		/* Release the chip-select */
 		qspi_writel(aq, QSPI_CR, QSPI_CR_LASTXFER);
+	}
 
-	if (err)
-		return err;
-
-#if defined(DEBUG) && defined(VERBOSE_DEBUG)
-	/*
-	 * If verbose debug is enabled, also dump the RX data in addition to
-	 * the SPI command previously dumped by atmel_qspi_debug_command()
-	 */
-	if (cmd->rx_buf)
-		print_hex_dump(KERN_DEBUG, "qspi rx : ", DUMP_PREFIX_NONE,
-			       32, 1, cmd->rx_buf, cmd->buf_len, false);
-#endif
-no_data:
 	/* Poll INSTRuction End status */
 	sr = qspi_readl(aq, QSPI_SR);
 	if ((sr & QSPI_SR_CMD_COMPLETED) == QSPI_SR_CMD_COMPLETED)
@@ -454,129 +337,50 @@ static int atmel_qspi_run_command(struct atmel_qspi *aq,
 	return err;
 }
 
-static int atmel_qspi_read_reg(struct spi_nor *nor, u8 opcode,
-			       u8 *buf, int len)
-{
-	struct atmel_qspi *aq = nor->priv;
-	struct atmel_qspi_command cmd;
-
-	memset(&cmd, 0, sizeof(cmd));
-	cmd.enable.bits.instruction = 1;
-	cmd.enable.bits.data = 1;
-	cmd.instruction = opcode;
-	cmd.rx_buf = buf;
-	cmd.buf_len = len;
-	return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_READ,
-				      nor->reg_proto);
-}
-
-static int atmel_qspi_write_reg(struct spi_nor *nor, u8 opcode,
-				u8 *buf, int len)
-{
-	struct atmel_qspi *aq = nor->priv;
-	struct atmel_qspi_command cmd;
-
-	memset(&cmd, 0, sizeof(cmd));
-	cmd.enable.bits.instruction = 1;
-	cmd.enable.bits.data = (buf != NULL && len > 0);
-	cmd.instruction = opcode;
-	cmd.tx_buf = buf;
-	cmd.buf_len = len;
-	return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE,
-				      nor->reg_proto);
-}
-
-static ssize_t atmel_qspi_write(struct spi_nor *nor, loff_t to, size_t len,
-				const u_char *write_buf)
-{
-	struct atmel_qspi *aq = nor->priv;
-	struct atmel_qspi_command cmd;
-	ssize_t ret;
-
-	memset(&cmd, 0, sizeof(cmd));
-	cmd.enable.bits.instruction = 1;
-	cmd.enable.bits.address = nor->addr_width;
-	cmd.enable.bits.data = 1;
-	cmd.instruction = nor->program_opcode;
-	cmd.address = (u32)to;
-	cmd.tx_buf = write_buf;
-	cmd.buf_len = len;
-	ret = atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE_MEM,
-				     nor->write_proto);
-	return (ret < 0) ? ret : len;
-}
-
-static int atmel_qspi_erase(struct spi_nor *nor, loff_t offs)
+const char *atmel_qspi_get_name(struct spi_mem *spimem)
 {
-	struct atmel_qspi *aq = nor->priv;
-	struct atmel_qspi_command cmd;
-
-	memset(&cmd, 0, sizeof(cmd));
-	cmd.enable.bits.instruction = 1;
-	cmd.enable.bits.address = nor->addr_width;
-	cmd.instruction = nor->erase_opcode;
-	cmd.address = (u32)offs;
-	return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE,
-				      nor->reg_proto);
+	return dev_name(spimem->spi->dev.parent);
 }
 
-static ssize_t atmel_qspi_read(struct spi_nor *nor, loff_t from, size_t len,
-			       u_char *read_buf)
-{
-	struct atmel_qspi *aq = nor->priv;
-	struct atmel_qspi_command cmd;
-	u8 num_mode_cycles, num_dummy_cycles;
-	ssize_t ret;
-
-	if (nor->read_dummy >= 2) {
-		num_mode_cycles = 2;
-		num_dummy_cycles = nor->read_dummy - 2;
-	} else {
-		num_mode_cycles = nor->read_dummy;
-		num_dummy_cycles = 0;
-	}
-
-	memset(&cmd, 0, sizeof(cmd));
-	cmd.enable.bits.instruction = 1;
-	cmd.enable.bits.address = nor->addr_width;
-	cmd.enable.bits.mode = (num_mode_cycles > 0);
-	cmd.enable.bits.dummy = (num_dummy_cycles > 0);
-	cmd.enable.bits.data = 1;
-	cmd.instruction = nor->read_opcode;
-	cmd.address = (u32)from;
-	cmd.mode = 0xff; /* This value prevents from entering the 0-4-4 mode */
-	cmd.num_mode_cycles = num_mode_cycles;
-	cmd.num_dummy_cycles = num_dummy_cycles;
-	cmd.rx_buf = read_buf;
-	cmd.buf_len = len;
-	ret = atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_READ_MEM,
-				     nor->read_proto);
-	return (ret < 0) ? ret : len;
-}
+static const struct spi_controller_mem_ops atmel_qspi_mem_ops = {
+	.supports_op = atmel_qspi_supports_op,
+	.exec_op = atmel_qspi_exec_op,
+	.get_name = atmel_qspi_get_name
+};
 
-static int atmel_qspi_init(struct atmel_qspi *aq)
+static int atmel_qspi_setup(struct spi_device *spi)
 {
+	struct spi_controller *ctrl = spi->master;
+	struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 	unsigned long src_rate;
-	u32 mr, scr, scbr;
+	u32 scr, scbr;
 
-	/* Reset the QSPI controller */
-	qspi_writel(aq, QSPI_CR, QSPI_CR_SWRST);
+	if (ctrl->busy)
+		return -EBUSY;
 
-	/* Set the QSPI controller in Serial Memory Mode */
-	mr = QSPI_MR_NBBITS(8) | QSPI_MR_SSM;
-	qspi_writel(aq, QSPI_MR, mr);
+	if (!spi->max_speed_hz)
+		return -EINVAL;
 
 	src_rate = clk_get_rate(aq->clk);
 	if (!src_rate)
 		return -EINVAL;
 
 	/* Compute the QSPI baudrate */
-	scbr = DIV_ROUND_UP(src_rate, aq->clk_rate);
+	scbr = DIV_ROUND_UP(src_rate, spi->max_speed_hz);
 	if (scbr > 0)
 		scbr--;
+
 	scr = QSPI_SCR_SCBR(scbr);
 	qspi_writel(aq, QSPI_SCR, scr);
 
+	return 0;
+}
+
+static int atmel_qspi_init(struct atmel_qspi *aq)
+{
+	/* Reset the QSPI controller */
+	qspi_writel(aq, QSPI_CR, QSPI_CR_SWRST);
+
 	/* Enable the QSPI controller */
 	qspi_writel(aq, QSPI_CR, QSPI_CR_QSPIEN);
 
@@ -604,38 +408,25 @@ static irqreturn_t atmel_qspi_interrupt(int irq, void *dev_id)
 
 static int atmel_qspi_probe(struct platform_device *pdev)
 {
-	const struct spi_nor_hwcaps hwcaps = {
-		.mask = SNOR_HWCAPS_READ |
-			SNOR_HWCAPS_READ_FAST |
-			SNOR_HWCAPS_READ_1_1_2 |
-			SNOR_HWCAPS_READ_1_2_2 |
-			SNOR_HWCAPS_READ_2_2_2 |
-			SNOR_HWCAPS_READ_1_1_4 |
-			SNOR_HWCAPS_READ_1_4_4 |
-			SNOR_HWCAPS_READ_4_4_4 |
-			SNOR_HWCAPS_PP |
-			SNOR_HWCAPS_PP_1_1_4 |
-			SNOR_HWCAPS_PP_1_4_4 |
-			SNOR_HWCAPS_PP_4_4_4,
-	};
-	struct device_node *child, *np = pdev->dev.of_node;
+	struct spi_controller *ctrl;
 	struct atmel_qspi *aq;
 	struct resource *res;
-	struct spi_nor *nor;
-	struct mtd_info *mtd;
 	int irq, err = 0;
 
-	if (of_get_child_count(np) != 1)
-		return -ENODEV;
-	child = of_get_next_child(np, NULL);
+	ctrl = spi_alloc_master(&pdev->dev, sizeof(*aq));
+	if (!ctrl)
+		return -ENOMEM;
 
-	aq = devm_kzalloc(&pdev->dev, sizeof(*aq), GFP_KERNEL);
-	if (!aq) {
-		err = -ENOMEM;
-		goto exit;
-	}
+	ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_DUAL | SPI_TX_QUAD;
+	ctrl->setup = atmel_qspi_setup;
+	ctrl->bus_num = -1;
+	ctrl->mem_ops = &atmel_qspi_mem_ops;
+	ctrl->num_chipselect = 1;
+	ctrl->dev.of_node = pdev->dev.of_node;
+	platform_set_drvdata(pdev, ctrl);
+
+	aq = spi_controller_get_devdata(ctrl);
 
-	platform_set_drvdata(pdev, aq);
 	init_completion(&aq->cmd_completion);
 	aq->pdev = pdev;
 
@@ -684,54 +475,30 @@ static int atmel_qspi_probe(struct platform_device *pdev)
 	if (err)
 		goto disable_clk;
 
-	/* Setup the spi-nor */
-	nor = &aq->nor;
-	mtd = &nor->mtd;
-
-	nor->dev = &pdev->dev;
-	spi_nor_set_flash_node(nor, child);
-	nor->priv = aq;
-	mtd->priv = nor;
-
-	nor->read_reg = atmel_qspi_read_reg;
-	nor->write_reg = atmel_qspi_write_reg;
-	nor->read = atmel_qspi_read;
-	nor->write = atmel_qspi_write;
-	nor->erase = atmel_qspi_erase;
-
-	err = of_property_read_u32(child, "spi-max-frequency", &aq->clk_rate);
-	if (err < 0)
-		goto disable_clk;
-
 	err = atmel_qspi_init(aq);
 	if (err)
 		goto disable_clk;
 
-	err = spi_nor_scan(nor, NULL, &hwcaps);
+	err = spi_register_controller(ctrl);
 	if (err)
 		goto disable_clk;
 
-	err = mtd_device_register(mtd, NULL, 0);
-	if (err)
-		goto disable_clk;
-
-	of_node_put(child);
-
 	return 0;
 
 disable_clk:
 	clk_disable_unprepare(aq->clk);
 exit:
-	of_node_put(child);
+	spi_controller_put(ctrl);
 
 	return err;
 }
 
 static int atmel_qspi_remove(struct platform_device *pdev)
 {
-	struct atmel_qspi *aq = platform_get_drvdata(pdev);
+	struct spi_controller *ctrl = platform_get_drvdata(pdev);
+	struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 
-	mtd_device_unregister(&aq->nor.mtd);
+	spi_unregister_controller(ctrl);
 	qspi_writel(aq, QSPI_CR, QSPI_CR_QSPIDIS);
 	clk_disable_unprepare(aq->clk);
 	return 0;
@@ -777,5 +544,6 @@ static struct platform_driver atmel_qspi_driver = {
 module_platform_driver(atmel_qspi_driver);
 
 MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>");
+MODULE_AUTHOR("Piotr Bugalski <bugalski.piotr@gmail.com");
 MODULE_DESCRIPTION("Atmel QSPI Controller driver");
 MODULE_LICENSE("GPL v2");

drivers/spi/spi-mem.c

@@ -149,7 +149,7 @@ static bool spi_mem_default_supports_op(struct spi_mem *mem,
 	    spi_check_buswidth_req(mem, op->dummy.buswidth, true))
 		return false;
 
-	if (op->data.nbytes &&
+	if (op->data.dir != SPI_MEM_NO_DATA &&
 	    spi_check_buswidth_req(mem, op->data.buswidth,
 				   op->data.dir == SPI_MEM_DATA_OUT))
 		return false;
@@ -220,6 +220,44 @@ bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op)
 }
 EXPORT_SYMBOL_GPL(spi_mem_supports_op);
 
+static int spi_mem_access_start(struct spi_mem *mem)
+{
+	struct spi_controller *ctlr = mem->spi->controller;
+
+	/*
+	 * Flush the message queue before executing our SPI memory
+	 * operation to prevent preemption of regular SPI transfers.
+	 */
+	spi_flush_queue(ctlr);
+
+	if (ctlr->auto_runtime_pm) {
+		int ret;
+
+		ret = pm_runtime_get_sync(ctlr->dev.parent);
+		if (ret < 0) {
+			dev_err(&ctlr->dev, "Failed to power device: %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	mutex_lock(&ctlr->bus_lock_mutex);
+	mutex_lock(&ctlr->io_mutex);
+
+	return 0;
+}
+
+static void spi_mem_access_end(struct spi_mem *mem)
+{
+	struct spi_controller *ctlr = mem->spi->controller;
+
+	mutex_unlock(&ctlr->io_mutex);
+	mutex_unlock(&ctlr->bus_lock_mutex);
+
+	if (ctlr->auto_runtime_pm)
+		pm_runtime_put(ctlr->dev.parent);
+}
+
 /**
  * spi_mem_exec_op() - Execute a memory operation
  * @mem: the SPI memory
@@ -249,30 +287,13 @@ int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 		return -ENOTSUPP;
 
 	if (ctlr->mem_ops) {
-		/*
-		 * Flush the message queue before executing our SPI memory
-		 * operation to prevent preemption of regular SPI transfers.
-		 */
-		spi_flush_queue(ctlr);
-
-		if (ctlr->auto_runtime_pm) {
-			ret = pm_runtime_get_sync(ctlr->dev.parent);
-			if (ret < 0) {
-				dev_err(&ctlr->dev,
-					"Failed to power device: %d\n",
-					ret);
+		ret = spi_mem_access_start(mem);
+		if (ret)
 			return ret;
-			}
-		}
 
-		mutex_lock(&ctlr->bus_lock_mutex);
-		mutex_lock(&ctlr->io_mutex);
 		ret = ctlr->mem_ops->exec_op(mem, op);
-		mutex_unlock(&ctlr->io_mutex);
-		mutex_unlock(&ctlr->bus_lock_mutex);
 
-		if (ctlr->auto_runtime_pm)
-			pm_runtime_put(ctlr->dev.parent);
+		spi_mem_access_end(mem);
 
 		/*
 		 * Some controllers only optimize specific paths (typically the
@@ -418,6 +439,210 @@ int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
 }
 EXPORT_SYMBOL_GPL(spi_mem_adjust_op_size);
 
+static ssize_t spi_mem_no_dirmap_read(struct spi_mem_dirmap_desc *desc,
+				      u64 offs, size_t len, void *buf)
+{
+	struct spi_mem_op op = desc->info.op_tmpl;
+	int ret;
+
+	op.addr.val = desc->info.offset + offs;
+	op.data.buf.in = buf;
+	op.data.nbytes = len;
+	ret = spi_mem_adjust_op_size(desc->mem, &op);
+	if (ret)
+		return ret;
+
+	ret = spi_mem_exec_op(desc->mem, &op);
+	if (ret)
+		return ret;
+
+	return op.data.nbytes;
+}
+
+static ssize_t spi_mem_no_dirmap_write(struct spi_mem_dirmap_desc *desc,
+				       u64 offs, size_t len, const void *buf)
+{
+	struct spi_mem_op op = desc->info.op_tmpl;
+	int ret;
+
+	op.addr.val = desc->info.offset + offs;
+	op.data.buf.out = buf;
+	op.data.nbytes = len;
+	ret = spi_mem_adjust_op_size(desc->mem, &op);
+	if (ret)
+		return ret;
+
+	ret = spi_mem_exec_op(desc->mem, &op);
+	if (ret)
+		return ret;
+
+	return op.data.nbytes;
+}
+
+/**
+ * spi_mem_dirmap_create() - Create a direct mapping descriptor
+ * @mem: SPI mem device this direct mapping should be created for
+ * @info: direct mapping information
+ *
+ * This function is creating a direct mapping descriptor which can then be used
+ * to access the memory using spi_mem_dirmap_read() or spi_mem_dirmap_write().
+ * If the SPI controller driver does not support direct mapping, this function
+ * fallback to an implementation using spi_mem_exec_op(), so that the caller
+ * doesn't have to bother implementing a fallback on his own.
+ *
+ * Return: a valid pointer in case of success, and ERR_PTR() otherwise.
+ */
+struct spi_mem_dirmap_desc *
+spi_mem_dirmap_create(struct spi_mem *mem,
+		      const struct spi_mem_dirmap_info *info)
+{
+	struct spi_controller *ctlr = mem->spi->controller;
+	struct spi_mem_dirmap_desc *desc;
+	int ret = -ENOTSUPP;
+
+	/* Make sure the number of address cycles is between 1 and 8 bytes. */
+	if (!info->op_tmpl.addr.nbytes || info->op_tmpl.addr.nbytes > 8)
+		return ERR_PTR(-EINVAL);
+
+	/* data.dir should either be SPI_MEM_DATA_IN or SPI_MEM_DATA_OUT. */
+	if (info->op_tmpl.data.dir == SPI_MEM_NO_DATA)
+		return ERR_PTR(-EINVAL);
+
+	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
+	if (!desc)
+		return ERR_PTR(-ENOMEM);
+
+	desc->mem = mem;
+	desc->info = *info;
+	if (ctlr->mem_ops && ctlr->mem_ops->dirmap_create)
+		ret = ctlr->mem_ops->dirmap_create(desc);
+
+	if (ret) {
+		desc->nodirmap = true;
+		if (!spi_mem_supports_op(desc->mem, &desc->info.op_tmpl))
+			ret = -ENOTSUPP;
+		else
+			ret = 0;
+	}
+
+	if (ret) {
+		kfree(desc);
+		return ERR_PTR(ret);
+	}
+
+	return desc;
+}
+EXPORT_SYMBOL_GPL(spi_mem_dirmap_create);
+
+/**
+ * spi_mem_dirmap_destroy() - Destroy a direct mapping descriptor
+ * @desc: the direct mapping descriptor to destroy
+ * @info: direct mapping information
+ *
+ * This function destroys a direct mapping descriptor previously created by
+ * spi_mem_dirmap_create().
+ */
+void spi_mem_dirmap_destroy(struct spi_mem_dirmap_desc *desc)
+{
+	struct spi_controller *ctlr = desc->mem->spi->controller;
+
+	if (!desc->nodirmap && ctlr->mem_ops && ctlr->mem_ops->dirmap_destroy)
+		ctlr->mem_ops->dirmap_destroy(desc);
+}
+EXPORT_SYMBOL_GPL(spi_mem_dirmap_destroy);
+
+/**
+ * spi_mem_dirmap_dirmap_read() - Read data through a direct mapping
+ * @desc: direct mapping descriptor
+ * @offs: offset to start reading from. Note that this is not an absolute
+ *	  offset, but the offset within the direct mapping which already has
+ *	  its own offset
+ * @len: length in bytes
+ * @buf: destination buffer. This buffer must be DMA-able
+ *
+ * This function reads data from a memory device using a direct mapping
+ * previously instantiated with spi_mem_dirmap_create().
+ *
+ * Return: the amount of data read from the memory device or a negative error
+ * code. Note that the returned size might be smaller than @len, and the caller
+ * is responsible for calling spi_mem_dirmap_read() again when that happens.
+ */
+ssize_t spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
+			    u64 offs, size_t len, void *buf)
+{
+	struct spi_controller *ctlr = desc->mem->spi->controller;
+	ssize_t ret;
+
+	if (desc->info.op_tmpl.data.dir != SPI_MEM_DATA_IN)
+		return -EINVAL;
+
+	if (!len)
+		return 0;
+
+	if (desc->nodirmap) {
+		ret = spi_mem_no_dirmap_read(desc, offs, len, buf);
+	} else if (ctlr->mem_ops && ctlr->mem_ops->dirmap_read) {
+		ret = spi_mem_access_start(desc->mem);
+		if (ret)
+			return ret;
+
+		ret = ctlr->mem_ops->dirmap_read(desc, offs, len, buf);
+
+		spi_mem_access_end(desc->mem);
+	} else {
+		ret = -ENOTSUPP;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(spi_mem_dirmap_read);
+
+/**
+ * spi_mem_dirmap_dirmap_write() - Write data through a direct mapping
+ * @desc: direct mapping descriptor
+ * @offs: offset to start writing from. Note that this is not an absolute
+ *	  offset, but the offset within the direct mapping which already has
+ *	  its own offset
+ * @len: length in bytes
+ * @buf: source buffer. This buffer must be DMA-able
+ *
+ * This function writes data to a memory device using a direct mapping
+ * previously instantiated with spi_mem_dirmap_create().
+ *
+ * Return: the amount of data written to the memory device or a negative error
+ * code. Note that the returned size might be smaller than @len, and the caller
+ * is responsible for calling spi_mem_dirmap_write() again when that happens.
+ */
+ssize_t spi_mem_dirmap_write(struct spi_mem_dirmap_desc *desc,
+			     u64 offs, size_t len, const void *buf)
+{
+	struct spi_controller *ctlr = desc->mem->spi->controller;
+	ssize_t ret;
+
+	if (desc->info.op_tmpl.data.dir != SPI_MEM_DATA_OUT)
+		return -EINVAL;
+
+	if (!len)
+		return 0;
+
+	if (desc->nodirmap) {
+		ret = spi_mem_no_dirmap_write(desc, offs, len, buf);
+	} else if (ctlr->mem_ops && ctlr->mem_ops->dirmap_write) {
+		ret = spi_mem_access_start(desc->mem);
+		if (ret)
+			return ret;
+
+		ret = ctlr->mem_ops->dirmap_write(desc, offs, len, buf);
+
+		spi_mem_access_end(desc->mem);
+	} else {
+		ret = -ENOTSUPP;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(spi_mem_dirmap_write);
+
 static inline struct spi_mem_driver *to_spi_mem_drv(struct device_driver *drv)
 {
 	return container_of(drv, struct spi_mem_driver, spidrv.driver);

include/linux/spi/spi-mem.h

@@ -57,10 +57,12 @@
 /**
  * enum spi_mem_data_dir - describes the direction of a SPI memory data
  *			   transfer from the controller perspective
+ * @SPI_MEM_NO_DATA: no data transferred
  * @SPI_MEM_DATA_IN: data coming from the SPI memory
- * @SPI_MEM_DATA_OUT: data sent the SPI memory
+ * @SPI_MEM_DATA_OUT: data sent to the SPI memory
  */
 enum spi_mem_data_dir {
+	SPI_MEM_NO_DATA,
 	SPI_MEM_DATA_IN,
 	SPI_MEM_DATA_OUT,
 };
@@ -122,6 +124,49 @@ struct spi_mem_op {
 		.data = __data,					\
 	}
 
+/**
+ * struct spi_mem_dirmap_info - Direct mapping information
+ * @op_tmpl: operation template that should be used by the direct mapping when
+ *	     the memory device is accessed
+ * @offset: absolute offset this direct mapping is pointing to
+ * @length: length in byte of this direct mapping
+ *
+ * These information are used by the controller specific implementation to know
+ * the portion of memory that is directly mapped and the spi_mem_op that should
+ * be used to access the device.
+ * A direct mapping is only valid for one direction (read or write) and this
+ * direction is directly encoded in the ->op_tmpl.data.dir field.
+ */
+struct spi_mem_dirmap_info {
+	struct spi_mem_op op_tmpl;
+	u64 offset;
+	u64 length;
+};
+
+/**
+ * struct spi_mem_dirmap_desc - Direct mapping descriptor
+ * @mem: the SPI memory device this direct mapping is attached to
+ * @info: information passed at direct mapping creation time
+ * @nodirmap: set to 1 if the SPI controller does not implement
+ *	      ->mem_ops->dirmap_create() or when this function returned an
+ *	      error. If @nodirmap is true, all spi_mem_dirmap_{read,write}()
+ *	      calls will use spi_mem_exec_op() to access the memory. This is a
+ *	      degraded mode that allows spi_mem drivers to use the same code
+ *	      no matter whether the controller supports direct mapping or not
+ * @priv: field pointing to controller specific data
+ *
+ * Common part of a direct mapping descriptor. This object is created by
+ * spi_mem_dirmap_create() and controller implementation of ->create_dirmap()
+ * can create/attach direct mapping resources to the descriptor in the ->priv
+ * field.
+ */
+struct spi_mem_dirmap_desc {
+	struct spi_mem *mem;
+	struct spi_mem_dirmap_info info;
+	unsigned int nodirmap;
+	void *priv;
+};
+
 /**
  * struct spi_mem - describes a SPI memory device
  * @spi: the underlying SPI device
@@ -177,10 +222,32 @@ static inline void *spi_mem_get_drvdata(struct spi_mem *mem)
  *	      Note that if the implementation of this function allocates memory
  *	      dynamically, then it should do so with devm_xxx(), as we don't
  *	      have a ->free_name() function.
+ * @dirmap_create: create a direct mapping descriptor that can later be used to
+ *		   access the memory device. This method is optional
+ * @dirmap_destroy: destroy a memory descriptor previous created by
+ *		    ->dirmap_create()
+ * @dirmap_read: read data from the memory device using the direct mapping
+ *		 created by ->dirmap_create(). The function can return less
+ *		 data than requested (for example when the request is crossing
+ *		 the currently mapped area), and the caller of
+ *		 spi_mem_dirmap_read() is responsible for calling it again in
+ *		 this case.
+ * @dirmap_write: write data to the memory device using the direct mapping
+ *		  created by ->dirmap_create(). The function can return less
+ *		  data than requested (for example when the request is crossing
+ *		  the currently mapped area), and the caller of
+ *		  spi_mem_dirmap_write() is responsible for calling it again in
+ *		  this case.
  *
  * This interface should be implemented by SPI controllers providing an
  * high-level interface to execute SPI memory operation, which is usually the
  * case for QSPI controllers.
+ *
+ * Note on ->dirmap_{read,write}(): drivers should avoid accessing the direct
+ * mapping from the CPU because doing that can stall the CPU waiting for the
+ * SPI mem transaction to finish, and this will make real-time maintainers
+ * unhappy and might make your system less reactive. Instead, drivers should
+ * use DMA to access this direct mapping.
  */
 struct spi_controller_mem_ops {
 	int (*adjust_op_size)(struct spi_mem *mem, struct spi_mem_op *op);
@@ -189,6 +256,12 @@ struct spi_controller_mem_ops {
 	int (*exec_op)(struct spi_mem *mem,
 		       const struct spi_mem_op *op);
 	const char *(*get_name)(struct spi_mem *mem);
+	int (*dirmap_create)(struct spi_mem_dirmap_desc *desc);
+	void (*dirmap_destroy)(struct spi_mem_dirmap_desc *desc);
+	ssize_t (*dirmap_read)(struct spi_mem_dirmap_desc *desc,
+			       u64 offs, size_t len, void *buf);
+	ssize_t (*dirmap_write)(struct spi_mem_dirmap_desc *desc,
+				u64 offs, size_t len, const void *buf);
 };
 
 /**
@@ -249,6 +322,15 @@ int spi_mem_exec_op(struct spi_mem *mem,
 
 const char *spi_mem_get_name(struct spi_mem *mem);
 
+struct spi_mem_dirmap_desc *
+spi_mem_dirmap_create(struct spi_mem *mem,
+		      const struct spi_mem_dirmap_info *info);
+void spi_mem_dirmap_destroy(struct spi_mem_dirmap_desc *desc);
+ssize_t spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
+			    u64 offs, size_t len, void *buf);
+ssize_t spi_mem_dirmap_write(struct spi_mem_dirmap_desc *desc,
+			     u64 offs, size_t len, const void *buf);
+
 int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv,
 				       struct module *owner);