(0) What is the QuadSPI controller?
The QuadSPI(Quad Serial Peripheral Interface) acts as an interface to
one single or two external serial flash devices, each with up to 4
bidirectional data lines.
(1) The QuadSPI controller is driven by the LUT(Look-up Table) registers.
The LUT registers are a look-up-table for sequences of instructions.
A valid sequence consists of four LUT registers.
(2) The definition of the LUT register shows below:
---------------------------------------------------
| INSTR1 | PAD1 | OPRND1 | INSTR0 | PAD0 | OPRND0 |
---------------------------------------------------
There are several types of INSTRx, such as:
CMD : the SPI NOR command.
ADDR : the address for the SPI NOR command.
DUMMY : the dummy cycles needed by the SPI NOR command.
....
There are several types of PADx, such as:
PAD1 : use a singe I/O line.
PAD2 : use two I/O lines.
PAD4 : use quad I/O lines.
....
(3) Test this driver with the JFFS2 and UBIFS:
For jffs2:
-------------
#flash_eraseall /dev/mtd0
#mount -t jffs2 /dev/mtdblock0 tmp
#bonnie++ -d tmp -u 0 -s 10 -r 5
For ubifs:
-------------
#flash_eraseall /dev/mtd0
#ubiattach /dev/ubi_ctrl -m 0
#ubimkvol /dev/ubi0 -N test -m
#mount -t ubifs ubi0:test tmp
#bonnie++ -d tmp -u 0 -s 10 -r 5
Signed-off-by: Huang Shijie <b32955@xxxxxxxxxxxxx>
---
drivers/mtd/spi-nor/Kconfig | 6 +
drivers/mtd/spi-nor/Makefile | 1 +
drivers/mtd/spi-nor/fsl-quadspi.c | 1009 +++++++++++++++++++++++++++++++++++++
3 files changed, 1016 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/spi-nor/fsl-quadspi.c
diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
index 41591af..64cfc39 100644
--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -4,3 +4,9 @@ config MTD_SPI_NOR_BASE
help
This is the framework for the SPI NOR which can be used by the SPI
device drivers and the SPI-NOR device driver.
+config SPI_FSL_QUADSPI
+ tristate "Freescale Quad SPI controller"
+ depends on ARCH_MXC && MTD_SPI_NOR_BASE
+ help
+ This enables support for the Quad SPI controller in master mode.
+ We only connect the NOR to this controller now.
diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
index 7dfe1f9..51f9d8b 100644
--- a/drivers/mtd/spi-nor/Makefile
+++ b/drivers/mtd/spi-nor/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_MTD_SPI_NOR_BASE) += spi-nor.o
+obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o
diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
new file mode 100644
index 0000000..6dc08ed
--- /dev/null
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -0,0 +1,1009 @@
+/*
+ * Freescale QuadSPI driver.
+ *
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/completion.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/spi-nor.h>
+
+/* The registers */
+#define QUADSPI_MCR 0x00
+#define QUADSPI_MCR_RESERVED_SHIFT 16
+#define QUADSPI_MCR_RESERVED_MASK (0xF << QUADSPI_MCR_RESERVED_SHIFT)
+#define QUADSPI_MCR_MDIS_SHIFT 14
+#define QUADSPI_MCR_MDIS_MASK (1 << QUADSPI_MCR_MDIS_SHIFT)
+#define QUADSPI_MCR_CLR_TXF_SHIFT 11
+#define QUADSPI_MCR_CLR_TXF_MASK (1 << QUADSPI_MCR_CLR_TXF_SHIFT)
+#define QUADSPI_MCR_CLR_RXF_SHIFT 10
+#define QUADSPI_MCR_CLR_RXF_MASK (1 << QUADSPI_MCR_CLR_RXF_SHIFT)
+#define QUADSPI_MCR_DDR_EN_SHIFT 7
+#define QUADSPI_MCR_DDR_EN_MASK (1 << QUADSPI_MCR_DDR_EN_SHIFT)
+#define QUADSPI_MCR_END_CFG_SHIFT 2
+#define QUADSPI_MCR_END_CFG_MASK (3 << QUADSPI_MCR_END_CFG_SHIFT)
+#define QUADSPI_MCR_SWRSTHD_SHIFT 1
+#define QUADSPI_MCR_SWRSTHD_MASK (1 << QUADSPI_MCR_SWRSTHD_SHIFT)
+#define QUADSPI_MCR_SWRSTSD_SHIFT 0
+#define QUADSPI_MCR_SWRSTSD_MASK (1 << QUADSPI_MCR_SWRSTSD_SHIFT)
+
+#define QUADSPI_IPCR 0x08
+#define QUADSPI_IPCR_SEQID_SHIFT 24
+#define QUADSPI_IPCR_SEQID_MASK (0xF << QUADSPI_IPCR_SEQID_SHIFT)
+
+#define QUADSPI_BUF0CR 0x10
+#define QUADSPI_BUF1CR 0x14
+#define QUADSPI_BUF2CR 0x18
+#define QUADSPI_BUFXCR_INVALID_MSTRID 0xe
+
+#define QUADSPI_BUF3CR 0x1c
+#define QUADSPI_BUF3CR_ALLMST_SHIFT 31
+#define QUADSPI_BUF3CR_ALLMST (1 << QUADSPI_BUF3CR_ALLMST_SHIFT)
+
+#define QUADSPI_BFGENCR 0x20
+#define QUADSPI_BFGENCR_PAR_EN_SHIFT 16
+#define QUADSPI_BFGENCR_PAR_EN_MASK (1 << (QUADSPI_BFGENCR_PAR_EN_SHIFT))
+#define QUADSPI_BFGENCR_SEQID_SHIFT 12
+#define QUADSPI_BFGENCR_SEQID_MASK (0xF << QUADSPI_BFGENCR_SEQID_SHIFT)
+
+#define QUADSPI_BUF0IND 0x30
+#define QUADSPI_BUF1IND 0x34
+#define QUADSPI_BUF2IND 0x38
+#define QUADSPI_SFAR 0x100
+
+#define QUADSPI_SMPR 0x108
+#define QUADSPI_SMPR_DDRSMP_SHIFT 16
+#define QUADSPI_SMPR_DDRSMP_MASK (7 << QUADSPI_SMPR_DDRSMP_SHIFT)
+#define QUADSPI_SMPR_FSDLY_SHIFT 6
+#define QUADSPI_SMPR_FSDLY_MASK (1 << QUADSPI_SMPR_FSDLY_SHIFT)
+#define QUADSPI_SMPR_FSPHS_SHIFT 5
+#define QUADSPI_SMPR_FSPHS_MASK (1 << QUADSPI_SMPR_FSPHS_SHIFT)
+#define QUADSPI_SMPR_HSENA_SHIFT 0
+#define QUADSPI_SMPR_HSENA_MASK (1 << QUADSPI_SMPR_HSENA_SHIFT)
+
+#define QUADSPI_RBSR 0x10c
+#define QUADSPI_RBSR_RDBFL_SHIFT 8
+#define QUADSPI_RBSR_RDBFL_MASK (0x3F << QUADSPI_RBSR_RDBFL_SHIFT)
+
+#define QUADSPI_RBCT 0x110
+#define QUADSPI_RBCT_WMRK_MASK 0x1F
+#define QUADSPI_RBCT_RXBRD_SHIFT 8
+#define QUADSPI_RBCT_RXBRD_USEIPS (0x1 << QUADSPI_RBCT_RXBRD_SHIFT)
+
+#define QUADSPI_TBSR 0x150
+#define QUADSPI_TBDR 0x154
+#define QUADSPI_SR 0x15c
+#define QUADSPI_SR_IP_ACC_SHIFT 1
+#define QUADSPI_SR_IP_ACC_MASK (0x1 << QUADSPI_SR_IP_ACC_SHIFT)
+#define QUADSPI_SR_AHB_ACC_SHIFT 2
+#define QUADSPI_SR_AHB_ACC_MASK (0x1 << QUADSPI_SR_AHB_ACC_SHIFT)
+
+#define QUADSPI_FR 0x160
+#define QUADSPI_FR_TFF_MASK 0x1
+
+#define QUADSPI_SFA1AD 0x180
+#define QUADSPI_SFA2AD 0x184
+#define QUADSPI_SFB1AD 0x188
+#define QUADSPI_SFB2AD 0x18c
+#define QUADSPI_RBDR 0x200
+
+#define QUADSPI_LUTKEY 0x300
+#define QUADSPI_LUTKEY_VALUE 0x5AF05AF0
+
+#define QUADSPI_LCKCR 0x304
+#define QUADSPI_LCKER_LOCK 0x1
+#define QUADSPI_LCKER_UNLOCK 0x2
+
+#define QUADSPI_RSER 0x164
+#define QUADSPI_RSER_TFIE (0x1 << 0)
+
+#define QUADSPI_LUT_BASE 0x310
+
+/*
+ * The definition of the LUT register shows below:
+ *
+ * ---------------------------------------------------
+ * | INSTR1 | PAD1 | OPRND1 | INSTR0 | PAD0 | OPRND0 |
+ * ---------------------------------------------------
+ */
+#define OPRND0_SHIFT 0
+#define PAD0_SHIFT 8
+#define INSTR0_SHIFT 10
+#define OPRND1_SHIFT 16
+
+/* Instruction set for the LUT register. */
+#define LUT_STOP 0
+#define LUT_CMD 1
+#define LUT_ADDR 2
+#define LUT_DUMMY 3
+#define LUT_MODE 4
+#define LUT_MODE2 5
+#define LUT_MODE4 6
+#define LUT_READ 7
+#define LUT_WRITE 8
+#define LUT_JMP_ON_CS 9
+#define LUT_ADDR_DDR 10
+#define LUT_MODE_DDR 11
+#define LUT_MODE2_DDR 12
+#define LUT_MODE4_DDR 13
+#define LUT_READ_DDR 14
+#define LUT_WRITE_DDR 15
+#define LUT_DATA_LEARN 16
+
+/*
+ * The PAD definitions for LUT register.
+ *
+ * The pad stands for the lines number of IO[0:3].
+ * For example, the Quad read need four IO lines, so you should
+ * set LUT_PAD4 which means we use four IO lines.
+ */
+#define LUT_PAD1 0
+#define LUT_PAD2 1
+#define LUT_PAD4 2
+
+/* Oprands for the LUT register. */
+#define ADDR24BIT 0x18
+#define ADDR32BIT 0x20
+
+/* Macros for constructing the LUT register. */
+#define LUT0(ins, pad, opr) \
+ (((opr) << OPRND0_SHIFT) | ((LUT_##pad) << PAD0_SHIFT) | \
+ ((LUT_##ins) << INSTR0_SHIFT))
+
+#define LUT1(ins, pad, opr) (LUT0(ins, pad, opr) << OPRND1_SHIFT)
+
+/* other macros for LUT register. */
+#define QUADSPI_LUT(x) (QUADSPI_LUT_BASE + (x) * 4)
+#define QUADSPI_LUT_NUM 64
+
+/* SEQID -- we can have 16 seqids at most. */
+#define SEQID_QUAD_READ 0
+#define SEQID_WREN 1
+#define SEQID_WRDI 2
+#define SEQID_RDSR 3
+#define SEQID_SE 4
+#define SEQID_CHIP_ERASE 5
+#define SEQID_PP 6
+#define SEQID_RDID 7
+#define SEQID_WRSR 8
+#define SEQID_RDCR 9
+#define SEQID_EN4B 10
+#define SEQID_BRWR 11
+
+enum fsl_qspi_devtype {
+ FSL_QUADSPI_VYBRID,
+ FSL_QUADSPI_IMX6SX,
+};
+
+struct fsl_qspi_devtype_data {
+ enum fsl_qspi_devtype devtype;
+ int rxfifo;
+ int txfifo;
+};
+
+static struct fsl_qspi_devtype_data vybrid_data = {
+ .devtype = FSL_QUADSPI_VYBRID,
+ .rxfifo = 128,
+ .txfifo = 64
+};
+
+static struct fsl_qspi_devtype_data imx6sx_data = {
+ .devtype = FSL_QUADSPI_IMX6SX,
+ .rxfifo = 128,
+ .txfifo = 512
+};
+
+#define FSL_QSPI_MAX_CHIP 4
+struct fsl_qspi {
+ struct mtd_info mtd[FSL_QSPI_MAX_CHIP];
+ struct spi_nor nor[FSL_QSPI_MAX_CHIP];
+ void __iomem *iobase;
+ void __iomem *ahb_base; /* Used when read from AHB bus */
+ u32 memmap_phy;
+ struct clk *clk, *clk_en;
+ struct device *dev;
+ struct completion c;
+ struct fsl_qspi_devtype_data *devtype_data;
+ u32 nor_size;
+ u32 nor_num;
+ u32 clk_rate;
+ unsigned int chip_base_addr; /* We may support two chips. */
+};
+
+static inline int is_vybrid_qspi(struct fsl_qspi *q)
+{
+ return q->devtype_data->devtype == FSL_QUADSPI_VYBRID;
+}
+
+static inline int is_imx6sx_qspi(struct fsl_qspi *q)
+{
+ return q->devtype_data->devtype == FSL_QUADSPI_IMX6SX;
+}
+
+/*
+ * An IC bug makes us to re-arrange the 32-bit data.
+ * The following chips, such as IMX6SLX, have fixed this bug.
+ */
+static inline u32 fsl_qspi_endian_xchg(struct fsl_qspi *q, u32 a)
+{
+ return is_vybrid_qspi(q) ? __swab32(a) : a;
+}
+
+static inline void fsl_qspi_unlock_lut(struct fsl_qspi *q)
+{
+ writel(QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY);
+ writel(QUADSPI_LCKER_UNLOCK, q->iobase + QUADSPI_LCKCR);
+}
+
+static inline void fsl_qspi_lock_lut(struct fsl_qspi *q)
+{
+ writel(QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY);
+ writel(QUADSPI_LCKER_LOCK, q->iobase + QUADSPI_LCKCR);
+}
+
+static irqreturn_t fsl_qspi_irq_handler(int irq, void *dev_id)
+{
+ struct fsl_qspi *q = dev_id;
+ u32 reg;
+
+ /* clear interrupt */
+ reg = readl(q->iobase + QUADSPI_FR);
+ writel(reg, q->iobase + QUADSPI_FR);
+
+ if (reg & QUADSPI_FR_TFF_MASK)
+ complete(&q->c);
+
+ dev_dbg(q->dev, "QUADSPI_FR : 0x%.8x:0x%.8x\n", q->chip_base_addr, reg);
+ return IRQ_HANDLED;
+}
+
+static void fsl_qspi_init_lut(struct fsl_qspi *q)
+{
+ void *__iomem base = q->iobase;
+ int rxfifo = q->devtype_data->rxfifo;
+ u32 lut_base;
+ u8 cmd, addrlen, dummy;
+ int i;
+
+ fsl_qspi_unlock_lut(q);
+
+ /* Clear all the LUT table */
+ for (i = 0; i < QUADSPI_LUT_NUM; i++)
+ writel(0, base + QUADSPI_LUT_BASE + i * 4);
+
+ /* Quad Read */
+ lut_base = SEQID_QUAD_READ * 4;
+
+ if (q->nor_size <= SZ_16M) {
+ cmd = OPCODE_QUAD_READ;
+ addrlen = ADDR24BIT;
+ dummy = 8;
+ } else {
+ /* use the 4-byte address */
+ cmd = OPCODE_QUAD_READ;
+ addrlen = ADDR32BIT;
+ dummy = 8;
+ }
+
+ writel(LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
+ base + QUADSPI_LUT(lut_base));
+ writel(LUT0(DUMMY, PAD1, dummy) | LUT1(READ, PAD4, rxfifo),
+ base + QUADSPI_LUT(lut_base + 1));
+
+ /* Write enable */
+ lut_base = SEQID_WREN * 4;
+ writel(LUT0(CMD, PAD1, OPCODE_WREN), base + QUADSPI_LUT(lut_base));
+
+ /* Page Program */
+ lut_base = SEQID_PP * 4;
+
+ if (q->nor_size <= SZ_16M) {
+ cmd = OPCODE_PP;
+ addrlen = ADDR24BIT;
+ } else {
+ /* use the 4-byte address */
+ cmd = OPCODE_PP;
+ addrlen = ADDR32BIT;
+ }
+
+ writel(LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
+ base + QUADSPI_LUT(lut_base));
+ writel(LUT0(WRITE, PAD1, 0), base + QUADSPI_LUT(lut_base + 1));
+
+ /* Read Status */
+ lut_base = SEQID_RDSR * 4;
+ writel(LUT0(CMD, PAD1, OPCODE_RDSR) | LUT1(READ, PAD1, 0x1),
+ base + QUADSPI_LUT(lut_base));
+
+ /* Erase a sector */
+ lut_base = SEQID_SE * 4;
+
+ if (q->nor_size <= SZ_16M) {
+ cmd = OPCODE_SE;
+ addrlen = ADDR24BIT;
+ } else {
+ /* use the 4-byte address */
+ cmd = OPCODE_SE;
+ addrlen = ADDR32BIT;
+ }
+
+ writel(LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
+ base + QUADSPI_LUT(lut_base));
+
+ /* Erase the whole chip */
+ lut_base = SEQID_CHIP_ERASE * 4;
+ writel(LUT0(CMD, PAD1, OPCODE_CHIP_ERASE),
+ base + QUADSPI_LUT(lut_base));
+
+ /* READ ID */
+ lut_base = SEQID_RDID * 4;
+ writel(LUT0(CMD, PAD1, OPCODE_RDID) | LUT1(READ, PAD1, 0x8),
+ base + QUADSPI_LUT(lut_base));
+
+ /* Write Register */
+ lut_base = SEQID_WRSR * 4;
+ writel(LUT0(CMD, PAD1, OPCODE_WRSR) | LUT1(WRITE, PAD1, 0x2),
+ base + QUADSPI_LUT(lut_base));
+
+ /* Read Configuration Register */
+ lut_base = SEQID_RDCR * 4;
+ writel(LUT0(CMD, PAD1, OPCODE_RDCR) | LUT1(READ, PAD1, 0x1),
+ base + QUADSPI_LUT(lut_base));
+
+ /* Write disable */
+ lut_base = SEQID_WRDI * 4;
+ writel(LUT0(CMD, PAD1, OPCODE_WRDI), base + QUADSPI_LUT(lut_base));
+
+ /* Enter 4 Byte Mode (Micron) */
+ lut_base = SEQID_EN4B * 4;
+ writel(LUT0(CMD, PAD1, OPCODE_EN4B), base + QUADSPI_LUT(lut_base));
+
+ /* Enter 4 Byte Mode (Spansion) */
+ lut_base = SEQID_BRWR * 4;
+ writel(LUT0(CMD, PAD1, OPCODE_BRWR), base + QUADSPI_LUT(lut_base));
+
+ fsl_qspi_lock_lut(q);
+}
+
+/* Get the SEQID for the command */
+static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
+{
+ switch (cmd) {
+ case OPCODE_QUAD_READ:
+ return SEQID_QUAD_READ;
+ case OPCODE_WREN:
+ return SEQID_WREN;
+ case OPCODE_WRDI:
+ return SEQID_WRDI;
+ case OPCODE_RDSR:
+ return SEQID_RDSR;
+ case OPCODE_SE:
+ return SEQID_SE;
+ case OPCODE_CHIP_ERASE:
+ return SEQID_CHIP_ERASE;
+ case OPCODE_PP:
+ return SEQID_PP;
+ case OPCODE_RDID:
+ return SEQID_RDID;
+ case OPCODE_WRSR:
+ return SEQID_WRSR;
+ case OPCODE_RDCR:
+ return SEQID_RDCR;
+ case OPCODE_EN4B:
+ return SEQID_EN4B;
+ case OPCODE_BRWR:
+ return SEQID_BRWR;
+ default:
+ dev_err(q->dev, "Unsupported cmd 0x%.2x\n", cmd);
+ break;
+ }
+ return -EINVAL;
+}
+
+static int
+fsl_qspi_runcmd(struct fsl_qspi *q, u8 cmd, unsigned int addr, int len)
+{
+ void *__iomem base = q->iobase;
+ int seqid;
+ u32 reg, reg2;
+ int err;
+
+ init_completion(&q->c);
+ dev_dbg(q->dev, "to 0x%.8x:0x%.8x, len:%d, cmd:%.2x\n",
+ q->chip_base_addr, addr, len, cmd);
+
+ /* save the reg */
+ reg = readl(base + QUADSPI_MCR);
+
+ writel(q->memmap_phy + q->chip_base_addr + addr, base + QUADSPI_SFAR);
+ writel(QUADSPI_RBCT_WMRK_MASK | QUADSPI_RBCT_RXBRD_USEIPS,
+ base + QUADSPI_RBCT);
+ writel(reg | QUADSPI_MCR_CLR_RXF_MASK, base + QUADSPI_MCR);
+
+ do {
+ reg2 = readl(base + QUADSPI_SR);
+ if (reg2 & (QUADSPI_SR_IP_ACC_MASK | QUADSPI_SR_AHB_ACC_MASK)) {
+ udelay(1);
+ dev_dbg(q->dev, "The controller is busy, 0x%x\n", reg2);
+ continue;
+ }
+ break;
+ } while (1);
+
+ /* trigger the LUT now */
+ seqid = fsl_qspi_get_seqid(q, cmd);
+ writel((seqid << QUADSPI_IPCR_SEQID_SHIFT) | len, base + QUADSPI_IPCR);
+
+ /* Wait for the interrupt. */
+ err = wait_for_completion_timeout(&q->c, msecs_to_jiffies(1000));
+ if (!err) {
+ dev_err(q->dev,
+ "cmd 0x%.2x timeout, addr@%.8x, FR:0x%.8x, SR:0x%.8x\n",
+ cmd, addr, readl(base + QUADSPI_FR),
+ readl(base + QUADSPI_SR));
+ err = -ETIMEDOUT;
+ } else {
+ err = 0;
+ }
+
+ /* restore the MCR */
+ writel(reg, base + QUADSPI_MCR);
+
+ return err;
+}
+
+/* Read out the data from the QUADSPI_RBDR buffer registers. */
+static void fsl_qspi_read_data(struct fsl_qspi *q, int len, u8 *rxbuf)
+{
+ u32 tmp;
+ int i = 0;
+
+ while (len > 0) {
+ tmp = readl(q->iobase + QUADSPI_RBDR + i * 4);
+ tmp = fsl_qspi_endian_xchg(q, tmp);
+ dev_dbg(q->dev, "chip addr:0x%.8x, rcv:0x%.8x\n",
+ q->chip_base_addr, tmp);
+
+ if (len >= 4) {
+ *((u32 *)rxbuf) = tmp;
+ rxbuf += 4;
+ } else {
+ memcpy(rxbuf, &tmp, len);
+ break;
+ }
+
+ len -= 4;
+ i++;
+ }
+}
+
+/*
+ * If we have changed the content of the flash by writing or erasing,
+ * we need to invalidate the AHB buffer. If we do not do so, we may read out
+ * the wrong data. The spec tells us reset the AHB domain and Serial Flash
+ * domain at the same time.
+ */
+static inline void fsl_qspi_invalid(struct fsl_qspi *q)
+{
+ u32 reg;
+
+ reg = readl(q->iobase + QUADSPI_MCR);
+ reg |= QUADSPI_MCR_SWRSTHD_MASK | QUADSPI_MCR_SWRSTSD_MASK;
+ writel(reg, q->iobase + QUADSPI_MCR);
+
+ /*
+ * The minimum delay : 1 AHB + 2 SFCK clocks.
+ * Delay 1 us is enough.
+ */
+ udelay(1);
+
+ reg &= ~(QUADSPI_MCR_SWRSTHD_MASK | QUADSPI_MCR_SWRSTSD_MASK);
+ writel(reg, q->iobase + QUADSPI_MCR);
+}
+
+static int fsl_qspi_nor_write(struct fsl_qspi *q, struct spi_nor *nor,
+ u8 opcode, unsigned int to, u32 *txbuf,
+ unsigned count, size_t *retlen)
+{
+ int ret, i, j;
+ u32 tmp;
+
+ dev_dbg(q->dev, "to 0x%.8x:0x%.8x, len : %d\n",
+ q->chip_base_addr, to, count);
+
+ /* clear the TX FIFO. */
+ tmp = readl(q->iobase + QUADSPI_MCR);
+ writel(tmp | QUADSPI_MCR_CLR_RXF_MASK, q->iobase + QUADSPI_MCR);
+
+ /* fill the TX data to the FIFO */
+ for (j = 0, i = ((count + 3) / 4); j < i; j++) {
+ tmp = fsl_qspi_endian_xchg(q, *txbuf);
+ writel(tmp, q->iobase + QUADSPI_TBDR);
+ txbuf++;
+ }
+
+ /* Trigger it */
+ ret = fsl_qspi_runcmd(q, opcode, to, count);
+
+ if (ret == 0 && retlen)
+ *retlen += count;
+
+ return ret;
+}
+
+static void fsl_qspi_set_map_addr(struct fsl_qspi *q)
+{
+ int nor_size = q->nor_size;
+ void __iomem *base = q->iobase;
+
+ writel(nor_size + q->memmap_phy, base + QUADSPI_SFA1AD);
+ writel(nor_size * 2 + q->memmap_phy, base + QUADSPI_SFA2AD);
+ writel(nor_size * 3 + q->memmap_phy, base + QUADSPI_SFB1AD);
+ writel(nor_size * 4 + q->memmap_phy, base + QUADSPI_SFB2AD);
+}
+
+/*
+ * There are two different ways to read out the data from the flash:
+ * the "IP Command Read" and the "AHB Command Read".
+ *
+ * The IC guy suggests we use the "AHB Command Read" which is faster
+ * then the "IP Command Read". (What's more is that there is a bug in
+ * the "IP Command Read" in the Vybrid.)
+ *
+ * After we set up the registers for the "AHB Command Read", we can use
+ * the memcpy to read the data directly. A "missed" access to the buffer
+ * causes the controller to clear the buffer, and use the sequence pointed
+ * by the QUADSPI_BFGENCR[SEQID] to initiate a read from the flash.
+ */
+static void fsl_qspi_init_abh_read(struct fsl_qspi *q)
+{
+ void __iomem *base = q->iobase;
+ int seqid;
+
+ /* AHB configuration for access buffer 0/1/2 .*/
+ writel(QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF0CR);
+ writel(QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF1CR);
+ writel(QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF2CR);
+ writel(QUADSPI_BUF3CR_ALLMST, base + QUADSPI_BUF3CR);
+
+ /* We only use the buffer3 */
+ writel(0, base + QUADSPI_BUF0IND);
+ writel(0, base + QUADSPI_BUF1IND);
+ writel(0, base + QUADSPI_BUF2IND);
+
+ /* Set the default lut sequence for AHB Read. */
+ seqid = fsl_qspi_get_seqid(q, q->nor[0].read_opcode);
+ writel(seqid << QUADSPI_BFGENCR_SEQID_SHIFT,
+ q->iobase + QUADSPI_BFGENCR);
+}
+
+/* We use this function to do some basic init for spi_nor_scan(). */
+static int fsl_qspi_nor_setup(struct fsl_qspi *q)
+{
+ void __iomem *base = q->iobase;
+ u32 reg;
+ int ret;
+
+ /* the default frequency, we will change it in the future.*/
+ ret = clk_set_rate(q->clk, 66000000);
+ if (ret)
+ return ret;
+
+ /* Init the LUT table. */
+ fsl_qspi_init_lut(q);
+
+ /* Disable the module */
+ writel(QUADSPI_MCR_MDIS_MASK | QUADSPI_MCR_RESERVED_MASK,
+ base + QUADSPI_MCR);
+
+ reg = readl(base + QUADSPI_SMPR);
+ writel(reg & ~(QUADSPI_SMPR_FSDLY_MASK
+ | QUADSPI_SMPR_FSPHS_MASK
+ | QUADSPI_SMPR_HSENA_MASK
+ | QUADSPI_SMPR_DDRSMP_MASK), base + QUADSPI_SMPR);
+
+ /* Enable the module */
+ writel(QUADSPI_MCR_RESERVED_MASK | QUADSPI_MCR_END_CFG_MASK,
+ base + QUADSPI_MCR);
+
+ /* enable the interrupt */
+ writel(QUADSPI_RSER_TFIE, q->iobase + QUADSPI_RSER);
+
+ return 0;
+}
+
+static int fsl_qspi_nor_setup_last(struct fsl_qspi *q)
+{
+ unsigned long rate = q->clk_rate;
+ int ret;
+
+ if (is_imx6sx_qspi(q))
+ rate *= 4;
+
+ ret = clk_set_rate(q->clk, rate);
+ if (ret)
+ return ret;
+
+ /* Init the LUT table again. */
+ fsl_qspi_init_lut(q);
+
+ /* Init for AHB read */
+ fsl_qspi_init_abh_read(q);
+
+ return 0;
+}
+
+static struct of_device_id fsl_qspi_dt_ids[] = {
+ { .compatible = "fsl,vf610-qspi", .data = (void *)&vybrid_data, },
+ { .compatible = "fsl,imx6sx-qspi", .data = (void *)&imx6sx_data, },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, fsl_qspi_dt_ids);
+
+static void fsl_qspi_set_base_addr(struct fsl_qspi *q, struct spi_nor *nor)
+{
+ q->chip_base_addr = q->nor_size * (nor - q->nor);
+}
+
+static int fsl_qspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+{
+ int ret;
+ struct fsl_qspi *q = nor->priv;
+
+ ret = fsl_qspi_runcmd(q, opcode, 0, len);
+ if (ret)
+ return ret;
+
+ fsl_qspi_read_data(q, len, buf);
+ return 0;
+}
+
+static int fsl_qspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len,
+ int write_enable)
+{
+ struct fsl_qspi *q = nor->priv;
+ int ret;
+
+ if (!buf) {
+ ret = fsl_qspi_runcmd(q, opcode, 0, 1);
+ if (ret)
+ return ret;
+
+ if (opcode == OPCODE_CHIP_ERASE)
+ fsl_qspi_invalid(q);
+
+ } else if (len > 0) {
+ ret = fsl_qspi_nor_write(q, nor, opcode, 0,
+ (u32 *)buf, len, NULL);
+ } else {
+ dev_err(q->dev, "invalid cmd %d\n", opcode);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static void fsl_qspi_write(struct spi_nor *nor, loff_t to,
+ size_t len, size_t *retlen, const u_char *buf)
+{
+ struct fsl_qspi *q = nor->priv;
+
+ fsl_qspi_nor_write(q, nor, nor->program_opcode, to,
+ (u32 *)buf, len, retlen);
+
+ /* invalid the data in the AHB buffer. */
+ fsl_qspi_invalid(q);
+}
+
+static int fsl_qspi_read(struct spi_nor *nor, loff_t from,
+ size_t len, size_t *retlen, u_char *buf)
+{
+ struct fsl_qspi *q = nor->priv;
+ u8 cmd = nor->read_opcode;
+ int ret;
+
+ dev_dbg(q->dev, "cmd [%x],read from (0x%p, 0x%.8x, 0x%.8x),len:%d\n",
+ cmd, q->ahb_base, q->chip_base_addr, (unsigned int)from, len);
+
+ /* Wait until the previous command is finished. */
+ ret = nor->wait_till_ready(nor);
+ if (ret)
+ return ret;
+
+ /* Read out the data directly from the AHB buffer.*/
+ memcpy(buf, q->ahb_base + q->chip_base_addr + from, len);
+
+ *retlen += len;
+ return 0;
+}
+
+static int fsl_qspi_erase(struct spi_nor *nor, loff_t offs)
+{
+ struct fsl_qspi *q = nor->priv;
+ int ret;
+
+ dev_dbg(nor->dev, "%dKiB at 0x%08x:0x%08x\n",
+ nor->mtd->erasesize / 1024, q->chip_base_addr, (u32)offs);
+
+ /* Wait until finished previous write command. */
+ ret = nor->wait_till_ready(nor);
+ if (ret)
+ return ret;
+
+ /* Send write enable, then erase commands. */
+ ret = nor->write_reg(nor, OPCODE_WREN, NULL, 0, 0);
+ if (ret)
+ return ret;
+
+ ret = fsl_qspi_runcmd(q, nor->erase_opcode, offs, 0);
+ if (ret)
+ return ret;
+
+ fsl_qspi_invalid(q);
+ return 0;
+}
+
+static int fsl_qspi_prep(struct spi_nor *nor, enum spi_nor_ops ops)
+{
+ struct fsl_qspi *q = nor->priv;
+ int ret;
+
+ ret = clk_enable(q->clk_en);
+ if (ret)
+ return ret;
+
+ ret = clk_enable(q->clk);
+ if (ret) {
+ clk_disable(q->clk_en);
+ return ret;
+ }
+
+ fsl_qspi_set_base_addr(q, nor);
+ return 0;
+}
+
+static void fsl_qspi_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
+{
+ struct fsl_qspi *q = nor->priv;
+
+ clk_disable(q->clk);
+ clk_disable(q->clk_en);
+}
+
+static int fsl_qspi_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct mtd_part_parser_data ppdata;
+ struct device *dev = &pdev->dev;
+ struct fsl_qspi *q;
+ struct resource *res;
+ struct spi_nor *nor;
+ struct mtd_info *mtd;
+ int ret, i = 0;
+ bool has_second_chip = false;
+ const struct of_device_id *of_id =
+ of_match_device(fsl_qspi_dt_ids, &pdev->dev);
+
+ q = devm_kzalloc(dev, sizeof(*q), GFP_KERNEL);
+ if (!q)
+ return -ENOMEM;
+
+ q->nor_num = of_get_child_count(dev->of_node);
+ if (!q->nor_num || q->nor_num > FSL_QSPI_MAX_CHIP)
+ return -ENODEV;
+
+ /* find the resources */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "QuadSPI");
+ q->iobase = devm_ioremap_resource(dev, res);
+ if (IS_ERR(q->iobase)) {
+ ret = PTR_ERR(q->iobase);
+ goto map_failed;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "QuadSPI-memory");
+ q->ahb_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(q->ahb_base)) {
+ ret = PTR_ERR(q->ahb_base);
+ goto map_failed;
+ }
+ q->memmap_phy = res->start;
+
+ /* find the clocks */
+ q->clk_en = devm_clk_get(dev, "qspi_en");
+ if (IS_ERR(q->clk_en)) {
+ ret = PTR_ERR(q->clk_en);
+ goto map_failed;
+ }
+
+ q->clk = devm_clk_get(dev, "qspi");
+ if (IS_ERR(q->clk)) {
+ ret = PTR_ERR(q->clk);
+ goto map_failed;
+ }
+
+ ret = clk_prepare_enable(q->clk_en);
+ if (ret) {
+ dev_err(dev, "can not enable the qspi_en clock\n");
+ goto map_failed;
+ }
+
+ ret = clk_prepare_enable(q->clk);
+ if (ret) {
+ clk_disable_unprepare(q->clk_en);
+ dev_err(dev, "can not enable the qspi clock\n");
+ goto map_failed;
+ }
+
+ /* find the irq */
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0) {
+ dev_err(dev, "failed to get the irq\n");
+ goto irq_failed;
+ }
+
+ ret = devm_request_irq(dev, ret,
+ fsl_qspi_irq_handler, 0, pdev->name, q);
+ if (ret) {
+ dev_err(dev, "failed to request irq.\n");
+ goto irq_failed;
+ }
+
+ q->dev = dev;
+ q->devtype_data = (struct fsl_qspi_devtype_data *)of_id->data;
+ platform_set_drvdata(pdev, q);
+
+ ret = fsl_qspi_nor_setup(q);
+ if (ret)
+ goto irq_failed;
+
+ if (of_get_property(np, "fsl,qspi-has-second-chip", NULL))
+ has_second_chip = true;
+
+ /* iterate the subnodes. */
+ for_each_available_child_of_node(dev->of_node, np) {
+ const struct spi_device_id *id;
+ char modalias[40];
+
+ /* skip the holes */
+ if (!has_second_chip)
+ i *= 2;
+
+ nor = &q->nor[i];
+ mtd = &q->mtd[i];
+
+ nor->mtd = mtd;
+ nor->dev = dev;
+ nor->priv = q;
+ mtd->priv = nor;
+
+ /* fill the hooks */
+ nor->read_reg = fsl_qspi_read_reg;
+ nor->write_reg = fsl_qspi_write_reg;
+ nor->read = fsl_qspi_read;
+ nor->write = fsl_qspi_write;
+ nor->erase = fsl_qspi_erase;
+
+ nor->prepare = fsl_qspi_prep;
+ nor->unprepare = fsl_qspi_unprep;
+
+ if (of_modalias_node(np, modalias, sizeof(modalias)) < 0)
+ goto map_failed;
+
+ id = spi_nor_match_id(modalias);
+ if (!id)
+ goto map_failed;
+
+ ret = of_property_read_u32(np, "spi-max-frequency",
+ &q->clk_rate);
+ if (ret < 0)
+ goto map_failed;
+
+ /* set the chip address for READID */
+ fsl_qspi_set_base_addr(q, nor);
+
+ ret = spi_nor_scan(nor, id, SPI_NOR_QUAD);
+ if (ret)
+ goto map_failed;
+
+ ppdata.of_node = np;
+ ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
+ if (ret)
+ goto map_failed;
+
+ /* Set the correct NOR size now. */
+ if (q->nor_size == 0) {
+ q->nor_size = mtd->size;
+
+ /* Map the SPI NOR to accessiable address */
+ fsl_qspi_set_map_addr(q);
+ }
+
+ /*
+ * The TX FIFO is 64 bytes in the Vybrid, but the Page Program
+ * may writes 265 bytes per time. The write is working in the
+ * unit of the TX FIFO, not in the unit of the SPI NOR's page
+ * size.
+ *
+ * So shrink the spi_nor->page_size if it is larger then the
+ * TX FIFO.
+ */
+ if (nor->page_size > q->devtype_data->txfifo)
+ nor->page_size = q->devtype_data->txfifo;
+
+ i++;
+ }
+
+ /* finish the rest init. */
+ ret = fsl_qspi_nor_setup_last(q);
+ if (ret)
+ goto last_init_failed;
+
+ clk_disable(q->clk);
+ clk_disable(q->clk_en);
+ dev_info(dev, "QuadSPI SPI NOR flash driver\n");
+ return 0;
+
+last_init_failed:
+ for (i = 0; i < q->nor_num; i++)
+ mtd_device_unregister(&q->mtd[i]);
+
+irq_failed:
+ clk_disable_unprepare(q->clk);
+ clk_disable_unprepare(q->clk_en);
+map_failed:
+ dev_err(dev, "Freescale QuadSPI probe failed\n");
+ return ret;
+}
+
+static int fsl_qspi_remove(struct platform_device *pdev)
+{
+ struct fsl_qspi *q = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < q->nor_num; i++)
+ mtd_device_unregister(&q->mtd[i]);
+
+ /* disable the hardware */
+ writel(QUADSPI_MCR_MDIS_MASK, q->iobase + QUADSPI_MCR);
+ writel(0x0, q->iobase + QUADSPI_RSER);
+
+ clk_unprepare(q->clk);
+ clk_unprepare(q->clk_en);
+ return 0;
+}
+
+static struct platform_driver fsl_qspi_driver = {
+ .driver = {
+ .name = "fsl-quadspi",
+ .bus = &platform_bus_type,
+ .owner = THIS_MODULE,
+ .of_match_table = fsl_qspi_dt_ids,
+ },
+ .probe = fsl_qspi_probe,
+ .remove = fsl_qspi_remove,
+};
+module_platform_driver(fsl_qspi_driver);
+
+MODULE_DESCRIPTION("Freescale QuadSPI Controller Driver");
+MODULE_AUTHOR("Freescale Semiconductor Inc.");
+MODULE_LICENSE("GPL v2");
--
1.7.2.rc3
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