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From:   Piotr Bugalski <bugalski.piotr@gmail.com>
To:     Mark Brown <broonie@kernel.org>, linux-spi@vger.kernel.org,
        David Woodhouse <dwmw2@infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        Boris Brezillon <boris.brezillon@bootlin.com>,
        Marek Vasut <marek.vasut@gmail.com>,
        Richard Weinberger <richard@nod.at>,
        linux-mtd@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org
Cc:     Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Nicolas Ferre <nicolas.ferre@microchip.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Cyrille Pitchen <cyrille.pitchen@microchip.com>,
        Tudor Ambarus <tudor.ambarus@microchip.com>,
        Piotr Bugalski <bugalski.piotr@gmail.com>,
        Piotr Bugalski <pbu@cryptera.com>
Subject: [RFC PATCH v2 4/6] mtd: spi-nor: atmel-quadspi: Remove unused code from atmel-quadspi driver
Date:   Wed, 27 Jun 2018 15:16:07 +0200
Message-Id: <20180627131609.13681-5-bugalski.piotr@gmail.com>
In-Reply-To: <20180627131609.13681-1-bugalski.piotr@gmail.com>
References: <20180627131609.13681-1-bugalski.piotr@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Code used for previous interface is no longer needed.
This change just removes obsolete code.

Suggested-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Piotr Bugalski <pbu@cryptera.com>
---
 drivers/mtd/spi-nor/atmel-quadspi.c | 389 ------------------------------------
 1 file changed, 389 deletions(-)

diff --git a/drivers/mtd/spi-nor/atmel-quadspi.c b/drivers/mtd/spi-nor/atmel-quadspi.c
index 3c98a3ee480a..f7accccc1e9f 100644
--- a/drivers/mtd/spi-nor/atmel-quadspi.c
+++ b/drivers/mtd/spi-nor/atmel-quadspi.c
@@ -29,14 +29,8 @@
 #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.h>
 #include <linux/spi/spi-mem.h>
 
 /* QSPI register offsets */
@@ -160,35 +154,9 @@ 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;
@@ -401,363 +369,6 @@ static int atmel_qspi_setup(struct spi_device *spi)
 	return 0;
 }
 
-static int atmel_qspi_run_transfer(struct atmel_qspi *aq,
-				   const struct atmel_qspi_command *cmd)
-{
-	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);
-
-	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 (cmd->enable.bits.instruction)
-		cmd_buf[len++] = cmd->instruction;
-
-	for (i = cmd->enable.bits.address-1; i >= 0; --i)
-		cmd_buf[len++] = (cmd->address >> (i << 3)) & 0xff;
-
-	if (cmd->enable.bits.mode)
-		cmd_buf[len++] = cmd->mode;
-
-	if (cmd->enable.bits.dummy) {
-		int num = cmd->num_dummy_cycles;
-
-		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;
-		}
-
-		for (i = 0; i < num; ++i)
-			cmd_buf[len++] = 0;
-	}
-
-	/* Dump the SPI command */
-	print_hex_dump(KERN_DEBUG, "qspi cmd: ", DUMP_PREFIX_NONE,
-		       32, 1, cmd_buf, len, 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
-}
-#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)
-{
-	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;
-
-	case SNOR_PROTO_1_1_4:
-		ifr |= QSPI_IFR_WIDTH_QUAD_OUTPUT;
-		break;
-
-	case SNOR_PROTO_1_2_2:
-		ifr |= QSPI_IFR_WIDTH_DUAL_IO;
-		break;
-
-	case SNOR_PROTO_1_4_4:
-		ifr |= QSPI_IFR_WIDTH_QUAD_IO;
-		break;
-
-	case SNOR_PROTO_2_2_2:
-		ifr |= QSPI_IFR_WIDTH_DUAL_CMD;
-		break;
-
-	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;
-	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;
-			break;
-
-		case 2:
-			ifr |= QSPI_IFR_OPTL_2BIT;
-			break;
-
-		case 4:
-			ifr |= QSPI_IFR_OPTL_4BIT;
-			break;
-
-		case 8:
-			ifr |= QSPI_IFR_OPTL_8BIT;
-			break;
-
-		default:
-			return -EINVAL;
-		}
-	}
-
-	/* Set number of dummy cycles */
-	if (cmd->enable.bits.dummy)
-		ifr |= QSPI_IFR_NBDUM(cmd->num_dummy_cycles);
-
-	/* Set data enable */
-	if (cmd->enable.bits.data) {
-		ifr |= QSPI_IFR_DATAEN;
-
-		/* Special case for Continuous Read Mode */
-		if (!cmd->tx_buf && !cmd->rx_buf)
-			ifr |= QSPI_IFR_CRM;
-	}
-
-	/* 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;
-
-	/* 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);
-
-	/* 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)
-		return err;
-
-	/* Wait for INSTRuction End interrupt */
-	reinit_completion(&aq->cmd_completion);
-	aq->pending = sr & QSPI_SR_CMD_COMPLETED;
-	qspi_writel(aq, QSPI_IER, QSPI_SR_CMD_COMPLETED);
-	if (!wait_for_completion_timeout(&aq->cmd_completion,
-					 msecs_to_jiffies(1000)))
-		err = -ETIMEDOUT;
-	qspi_writel(aq, QSPI_IDR, QSPI_SR_CMD_COMPLETED);
-
-	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)
-{
-	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);
-}
-
-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 int atmel_qspi_init(struct atmel_qspi *aq)
 {
 	/* Reset the QSPI controller */
-- 
2.11.0