commit 6b57ff6fd5111840dd4787f3d08596076e752676
author Alison Wang <b18965@freescale.com> Tue May 06 09:13:01 2014 +0800
committer Albert ARIBAUD <albert.u.boot@aribaud.net> Mon Jun 09 09:18:09 2014 +0200
tree 435e4d224ef2ccb19bde7b2f07c8a366468233a4
parent 5ed28948a3ffe6c735386e59c132989869beaa3e

arm: vf610: Add QSPI driver support

Add Freescale QSPI driver support for VF610.

Signed-off-by: Alison Wang <Huan.Wang@freescale.com>
Signed-off-by: Chao Fu <b44548@freescale.com>

drivers/spi/fsl_qspi.c

diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
new file mode 100644
index 0000000..ba20bef
--- /dev/null
+++ b/drivers/spi/fsl_qspi.c
@@ -0,0 +1,482 @@
+/*
+ * Copyright 2013-2014 Freescale Semiconductor, Inc.
+ *
+ * Freescale Quad Serial Peripheral Interface (QSPI) driver
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <spi.h>
+#include <asm/io.h>
+#include <linux/sizes.h>
+#include "fsl_qspi.h"
+
+#define RX_BUFFER_SIZE		0x80
+#define TX_BUFFER_SIZE		0x40
+
+#define OFFSET_BITS_MASK	0x00ffffff
+
+#define FLASH_STATUS_WEL	0x02
+
+/* SEQID */
+#define SEQID_WREN		1
+#define SEQID_FAST_READ		2
+#define SEQID_RDSR		3
+#define SEQID_SE		4
+#define SEQID_CHIP_ERASE	5
+#define SEQID_PP		6
+#define SEQID_RDID		7
+
+/* Flash opcodes */
+#define OPCODE_PP		0x02	/* Page program (up to 256 bytes) */
+#define OPCODE_RDSR		0x05	/* Read status register */
+#define OPCODE_WREN		0x06	/* Write enable */
+#define OPCODE_FAST_READ	0x0b	/* Read data bytes (high frequency) */
+#define OPCODE_CHIP_ERASE	0xc7	/* Erase whole flash chip */
+#define OPCODE_SE		0xd8	/* Sector erase (usually 64KiB) */
+#define OPCODE_RDID		0x9f	/* Read JEDEC ID */
+
+/* 4-byte address opcodes - used on Spansion and some Macronix flashes */
+#define OPCODE_FAST_READ_4B	0x0c    /* Read data bytes (high frequency) */
+#define OPCODE_PP_4B		0x12    /* Page program (up to 256 bytes) */
+#define OPCODE_SE_4B		0xdc    /* Sector erase (usually 64KiB) */
+
+#ifdef CONFIG_SYS_FSL_QSPI_LE
+#define qspi_read32		in_le32
+#define qspi_write32		out_le32
+#elif defined(CONFIG_SYS_FSL_QSPI_BE)
+#define qspi_read32		in_be32
+#define qspi_write32		out_be32
+#endif
+
+static unsigned long spi_bases[] = {
+	QSPI0_BASE_ADDR,
+};
+
+static unsigned long amba_bases[] = {
+	QSPI0_AMBA_BASE,
+};
+
+struct fsl_qspi {
+	struct spi_slave slave;
+	unsigned long reg_base;
+	unsigned long amba_base;
+	u32 sf_addr;
+	u8 cur_seqid;
+};
+
+/* QSPI support swapping the flash read/write data
+ * in hardware for LS102xA, but not for VF610 */
+static inline u32 qspi_endian_xchg(u32 data)
+{
+#ifdef CONFIG_VF610
+	return swab32(data);
+#else
+	return data;
+#endif
+}
+
+static inline struct fsl_qspi *to_qspi_spi(struct spi_slave *slave)
+{
+	return container_of(slave, struct fsl_qspi, slave);
+}
+
+static void qspi_set_lut(struct fsl_qspi *qspi)
+{
+	struct fsl_qspi_regs *regs = (struct fsl_qspi_regs *)qspi->reg_base;
+	u32 lut_base;
+
+	/* Unlock the LUT */
+	qspi_write32(&regs->lutkey, LUT_KEY_VALUE);
+	qspi_write32(&regs->lckcr, QSPI_LCKCR_UNLOCK);
+
+	/* Write Enable */
+	lut_base = SEQID_WREN * 4;
+	qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_WREN) |
+		PAD0(LUT_PAD1) | INSTR0(LUT_CMD));
+	qspi_write32(&regs->lut[lut_base + 1], 0);
+	qspi_write32(&regs->lut[lut_base + 2], 0);
+	qspi_write32(&regs->lut[lut_base + 3], 0);
+
+	/* Fast Read */
+	lut_base = SEQID_FAST_READ * 4;
+	if (FSL_QSPI_FLASH_SIZE  <= SZ_16M)
+		qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_FAST_READ) |
+			PAD0(LUT_PAD1) | INSTR0(LUT_CMD) | OPRND1(ADDR24BIT) |
+			PAD1(LUT_PAD1) | INSTR1(LUT_ADDR));
+	else
+		qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_FAST_READ_4B) |
+			PAD0(LUT_PAD1) | INSTR0(LUT_CMD) | OPRND1(ADDR32BIT) |
+			PAD1(LUT_PAD1) | INSTR1(LUT_ADDR));
+	qspi_write32(&regs->lut[lut_base + 1], OPRND0(8) | PAD0(LUT_PAD1) |
+		INSTR0(LUT_DUMMY) | OPRND1(RX_BUFFER_SIZE) | PAD1(LUT_PAD1) |
+		INSTR1(LUT_READ));
+	qspi_write32(&regs->lut[lut_base + 2], 0);
+	qspi_write32(&regs->lut[lut_base + 3], 0);
+
+	/* Read Status */
+	lut_base = SEQID_RDSR * 4;
+	qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_RDSR) |
+		PAD0(LUT_PAD1) | INSTR0(LUT_CMD) | OPRND1(1) |
+		PAD1(LUT_PAD1) | INSTR1(LUT_READ));
+	qspi_write32(&regs->lut[lut_base + 1], 0);
+	qspi_write32(&regs->lut[lut_base + 2], 0);
+	qspi_write32(&regs->lut[lut_base + 3], 0);
+
+	/* Erase a sector */
+	lut_base = SEQID_SE * 4;
+	if (FSL_QSPI_FLASH_SIZE  <= SZ_16M)
+		qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_SE) |
+			PAD0(LUT_PAD1) | INSTR0(LUT_CMD) | OPRND1(ADDR24BIT) |
+			PAD1(LUT_PAD1) | INSTR1(LUT_ADDR));
+	else
+		qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_SE_4B) |
+			PAD0(LUT_PAD1) | INSTR0(LUT_CMD) | OPRND1(ADDR32BIT) |
+			PAD1(LUT_PAD1) | INSTR1(LUT_ADDR));
+	qspi_write32(&regs->lut[lut_base + 1], 0);
+	qspi_write32(&regs->lut[lut_base + 2], 0);
+	qspi_write32(&regs->lut[lut_base + 3], 0);
+
+	/* Erase the whole chip */
+	lut_base = SEQID_CHIP_ERASE * 4;
+	qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_CHIP_ERASE) |
+		PAD0(LUT_PAD1) | INSTR0(LUT_CMD));
+	qspi_write32(&regs->lut[lut_base + 1], 0);
+	qspi_write32(&regs->lut[lut_base + 2], 0);
+	qspi_write32(&regs->lut[lut_base + 3], 0);
+
+	/* Page Program */
+	lut_base = SEQID_PP * 4;
+	if (FSL_QSPI_FLASH_SIZE  <= SZ_16M)
+		qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_PP) |
+			PAD0(LUT_PAD1) | INSTR0(LUT_CMD) | OPRND1(ADDR24BIT) |
+			PAD1(LUT_PAD1) | INSTR1(LUT_ADDR));
+	else
+		qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_PP_4B) |
+			PAD0(LUT_PAD1) | INSTR0(LUT_CMD) | OPRND1(ADDR32BIT) |
+			PAD1(LUT_PAD1) | INSTR1(LUT_ADDR));
+	qspi_write32(&regs->lut[lut_base + 1], OPRND0(TX_BUFFER_SIZE) |
+		PAD0(LUT_PAD1) | INSTR0(LUT_WRITE));
+	qspi_write32(&regs->lut[lut_base + 2], 0);
+	qspi_write32(&regs->lut[lut_base + 3], 0);
+
+	/* READ ID */
+	lut_base = SEQID_RDID * 4;
+	qspi_write32(&regs->lut[lut_base], OPRND0(OPCODE_RDID) |
+		PAD0(LUT_PAD1) | INSTR0(LUT_CMD) | OPRND1(8) |
+		PAD1(LUT_PAD1) | INSTR1(LUT_READ));
+	qspi_write32(&regs->lut[lut_base + 1], 0);
+	qspi_write32(&regs->lut[lut_base + 2], 0);
+	qspi_write32(&regs->lut[lut_base + 3], 0);
+
+	/* Lock the LUT */
+	qspi_write32(&regs->lutkey, LUT_KEY_VALUE);
+	qspi_write32(&regs->lckcr, QSPI_LCKCR_LOCK);
+}
+
+void spi_init()
+{
+	/* do nothing */
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+		unsigned int max_hz, unsigned int mode)
+{
+	struct fsl_qspi *qspi;
+	struct fsl_qspi_regs *regs;
+	u32 reg_val, smpr_val;
+	u32 total_size, seq_id;
+
+	if (bus >= ARRAY_SIZE(spi_bases))
+		return NULL;
+
+	qspi = spi_alloc_slave(struct fsl_qspi, bus, cs);
+	if (!qspi)
+		return NULL;
+
+	qspi->reg_base = spi_bases[bus];
+	qspi->amba_base = amba_bases[bus];
+
+	qspi->slave.max_write_size = TX_BUFFER_SIZE;
+
+	regs = (struct fsl_qspi_regs *)qspi->reg_base;
+	qspi_write32(&regs->mcr, QSPI_MCR_RESERVED_MASK | QSPI_MCR_MDIS_MASK);
+
+	smpr_val = qspi_read32(&regs->smpr);
+	qspi_write32(&regs->smpr, smpr_val & ~(QSPI_SMPR_FSDLY_MASK |
+		QSPI_SMPR_FSPHS_MASK | QSPI_SMPR_HSENA_MASK));
+	qspi_write32(&regs->mcr, QSPI_MCR_RESERVED_MASK);
+
+	total_size = FSL_QSPI_FLASH_SIZE * FSL_QSPI_FLASH_NUM;
+	qspi_write32(&regs->sfa1ad, FSL_QSPI_FLASH_SIZE | qspi->amba_base);
+	qspi_write32(&regs->sfa2ad, FSL_QSPI_FLASH_SIZE | qspi->amba_base);
+	qspi_write32(&regs->sfb1ad, total_size | qspi->amba_base);
+	qspi_write32(&regs->sfb2ad, total_size | qspi->amba_base);
+
+	qspi_set_lut(qspi);
+
+	smpr_val = qspi_read32(&regs->smpr);
+	smpr_val &= ~QSPI_SMPR_DDRSMP_MASK;
+	qspi_write32(&regs->smpr, smpr_val);
+	qspi_write32(&regs->mcr, QSPI_MCR_RESERVED_MASK);
+
+	seq_id = 0;
+	reg_val = qspi_read32(&regs->bfgencr);
+	reg_val &= ~QSPI_BFGENCR_SEQID_MASK;
+	reg_val |= (seq_id << QSPI_BFGENCR_SEQID_SHIFT);
+	reg_val &= ~QSPI_BFGENCR_PAR_EN_MASK;
+	qspi_write32(&regs->bfgencr, reg_val);
+
+	return &qspi->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+	struct fsl_qspi *qspi = to_qspi_spi(slave);
+
+	free(qspi);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+	return 0;
+}
+
+static void qspi_op_rdid(struct fsl_qspi *qspi, u32 *rxbuf, u32 len)
+{
+	struct fsl_qspi_regs *regs = (struct fsl_qspi_regs *)qspi->reg_base;
+	u32 mcr_reg, rbsr_reg, data;
+	int i, size;
+
+	mcr_reg = qspi_read32(&regs->mcr);
+	qspi_write32(&regs->mcr, QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
+		QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+	qspi_write32(&regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
+
+	qspi_write32(&regs->sfar, qspi->amba_base);
+
+	qspi_write32(&regs->ipcr, (SEQID_RDID << QSPI_IPCR_SEQID_SHIFT) | 0);
+	while (qspi_read32(&regs->sr) & QSPI_SR_BUSY_MASK)
+		;
+
+	i = 0;
+	size = len;
+	while ((RX_BUFFER_SIZE >= size) && (size > 0)) {
+		rbsr_reg = qspi_read32(&regs->rbsr);
+		if (rbsr_reg & QSPI_RBSR_RDBFL_MASK) {
+			data = qspi_read32(&regs->rbdr[i]);
+			data = qspi_endian_xchg(data);
+			memcpy(rxbuf, &data, 4);
+			rxbuf++;
+			size -= 4;
+			i++;
+		}
+	}
+
+	qspi_write32(&regs->mcr, mcr_reg);
+}
+
+static void qspi_op_read(struct fsl_qspi *qspi, u32 *rxbuf, u32 len)
+{
+	struct fsl_qspi_regs *regs = (struct fsl_qspi_regs *)qspi->reg_base;
+	u32 mcr_reg, data;
+	int i, size;
+	u32 to_or_from;
+
+	mcr_reg = qspi_read32(&regs->mcr);
+	qspi_write32(&regs->mcr, QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
+		QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+	qspi_write32(&regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
+
+	to_or_from = qspi->sf_addr + qspi->amba_base;
+
+	while (len > 0) {
+		qspi_write32(&regs->sfar, to_or_from);
+
+		size = (len > RX_BUFFER_SIZE) ?
+			RX_BUFFER_SIZE : len;
+
+		qspi_write32(&regs->ipcr,
+			(SEQID_FAST_READ << QSPI_IPCR_SEQID_SHIFT) | size);
+		while (qspi_read32(&regs->sr) & QSPI_SR_BUSY_MASK)
+			;
+
+		to_or_from += size;
+		len -= size;
+
+		i = 0;
+		while ((RX_BUFFER_SIZE >= size) && (size > 0)) {
+			data = qspi_read32(&regs->rbdr[i]);
+			data = qspi_endian_xchg(data);
+			memcpy(rxbuf, &data, 4);
+			rxbuf++;
+			size -= 4;
+			i++;
+		}
+		qspi_write32(&regs->mcr, qspi_read32(&regs->mcr) |
+			QSPI_MCR_CLR_RXF_MASK);
+	}
+
+	qspi_write32(&regs->mcr, mcr_reg);
+}
+
+static void qspi_op_pp(struct fsl_qspi *qspi, u32 *txbuf, u32 len)
+{
+	struct fsl_qspi_regs *regs = (struct fsl_qspi_regs *)qspi->reg_base;
+	u32 mcr_reg, data, reg, status_reg;
+	int i, size, tx_size;
+	u32 to_or_from = 0;
+
+	mcr_reg = qspi_read32(&regs->mcr);
+	qspi_write32(&regs->mcr, QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
+		QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+	qspi_write32(&regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
+
+	status_reg = 0;
+	while ((status_reg & FLASH_STATUS_WEL) != FLASH_STATUS_WEL) {
+		qspi_write32(&regs->ipcr,
+			(SEQID_WREN << QSPI_IPCR_SEQID_SHIFT) | 0);
+		while (qspi_read32(&regs->sr) & QSPI_SR_BUSY_MASK)
+			;
+
+		qspi_write32(&regs->ipcr,
+			(SEQID_RDSR << QSPI_IPCR_SEQID_SHIFT) | 1);
+		while (qspi_read32(&regs->sr) & QSPI_SR_BUSY_MASK)
+			;
+
+		reg = qspi_read32(&regs->rbsr);
+		if (reg & QSPI_RBSR_RDBFL_MASK) {
+			status_reg = qspi_read32(&regs->rbdr[0]);
+			status_reg = qspi_endian_xchg(status_reg);
+		}
+		qspi_write32(&regs->mcr,
+			qspi_read32(&regs->mcr) | QSPI_MCR_CLR_RXF_MASK);
+	}
+
+	to_or_from = qspi->sf_addr + qspi->amba_base;
+	qspi_write32(&regs->sfar, to_or_from);
+
+	tx_size = (len > TX_BUFFER_SIZE) ?
+		TX_BUFFER_SIZE : len;
+
+	size = (tx_size + 3) / 4;
+
+	for (i = 0; i < size; i++) {
+		data = qspi_endian_xchg(*txbuf);
+		qspi_write32(&regs->tbdr, data);
+		txbuf++;
+	}
+
+	qspi_write32(&regs->ipcr,
+		(SEQID_PP << QSPI_IPCR_SEQID_SHIFT) | tx_size);
+	while (qspi_read32(&regs->sr) & QSPI_SR_BUSY_MASK)
+		;
+
+	qspi_write32(&regs->mcr, mcr_reg);
+}
+
+static void qspi_op_rdsr(struct fsl_qspi *qspi, u32 *rxbuf)
+{
+	struct fsl_qspi_regs *regs = (struct fsl_qspi_regs *)qspi->reg_base;
+	u32 mcr_reg, reg, data;
+
+	mcr_reg = qspi_read32(&regs->mcr);
+	qspi_write32(&regs->mcr, QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
+		QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+	qspi_write32(&regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
+
+	qspi_write32(&regs->sfar, qspi->amba_base);
+
+	qspi_write32(&regs->ipcr,
+		(SEQID_RDSR << QSPI_IPCR_SEQID_SHIFT) | 0);
+	while (qspi_read32(&regs->sr) & QSPI_SR_BUSY_MASK)
+		;
+
+	while (1) {
+		reg = qspi_read32(&regs->rbsr);
+		if (reg & QSPI_RBSR_RDBFL_MASK) {
+			data = qspi_read32(&regs->rbdr[0]);
+			data = qspi_endian_xchg(data);
+			memcpy(rxbuf, &data, 4);
+			qspi_write32(&regs->mcr, qspi_read32(&regs->mcr) |
+				QSPI_MCR_CLR_RXF_MASK);
+			break;
+		}
+	}
+
+	qspi_write32(&regs->mcr, mcr_reg);
+}
+
+static void qspi_op_se(struct fsl_qspi *qspi)
+{
+	struct fsl_qspi_regs *regs = (struct fsl_qspi_regs *)qspi->reg_base;
+	u32 mcr_reg;
+	u32 to_or_from = 0;
+
+	mcr_reg = qspi_read32(&regs->mcr);
+	qspi_write32(&regs->mcr, QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
+		QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+	qspi_write32(&regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
+
+	to_or_from = qspi->sf_addr + qspi->amba_base;
+	qspi_write32(&regs->sfar, to_or_from);
+
+	qspi_write32(&regs->ipcr,
+		(SEQID_WREN << QSPI_IPCR_SEQID_SHIFT) | 0);
+	while (qspi_read32(&regs->sr) & QSPI_SR_BUSY_MASK)
+		;
+
+	qspi_write32(&regs->ipcr,
+		(SEQID_SE << QSPI_IPCR_SEQID_SHIFT) | 0);
+	while (qspi_read32(&regs->sr) & QSPI_SR_BUSY_MASK)
+		;
+
+	qspi_write32(&regs->mcr, mcr_reg);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
+		const void *dout, void *din, unsigned long flags)
+{
+	struct fsl_qspi *qspi = to_qspi_spi(slave);
+	u32 bytes = DIV_ROUND_UP(bitlen, 8);
+	static u32 pp_sfaddr;
+	u32 txbuf;
+
+	if (dout) {
+		memcpy(&txbuf, dout, 4);
+		qspi->cur_seqid = *(u8 *)dout;
+
+		if (flags == SPI_XFER_END) {
+			qspi->sf_addr = pp_sfaddr;
+			qspi_op_pp(qspi, (u32 *)dout, bytes);
+			return 0;
+		}
+
+		if (qspi->cur_seqid == OPCODE_FAST_READ) {
+			qspi->sf_addr = swab32(txbuf) & OFFSET_BITS_MASK;
+		} else if (qspi->cur_seqid == OPCODE_SE) {
+			qspi->sf_addr = swab32(txbuf) & OFFSET_BITS_MASK;
+			qspi_op_se(qspi);
+		} else if (qspi->cur_seqid == OPCODE_PP) {
+			pp_sfaddr = swab32(txbuf) & OFFSET_BITS_MASK;
+		}
+	}
+
+	if (din) {
+		if (qspi->cur_seqid == OPCODE_FAST_READ)
+			qspi_op_read(qspi, din, bytes);
+		else if (qspi->cur_seqid == OPCODE_RDID)
+			qspi_op_rdid(qspi, din, bytes);
+		else if (qspi->cur_seqid == OPCODE_RDSR)
+			qspi_op_rdsr(qspi, din);
+	}
+
+	return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+	/* Nothing to do */
+}