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author | 2019-01-07 09:29:47 +0000 | |
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committer | 2019-01-07 16:56:24 +0000 | |
commit | 84d043185dbe0d1b4f6db575bd91c834d37e2f78 (patch) | |
tree | 25189f354efccc72de09548f04004acc7636f9bd /drivers/spi/spi-fsl-qspi.c | |
parent | Linux 5.0-rc1 (diff) | |
download | linux-84d043185dbe0d1b4f6db575bd91c834d37e2f78.tar.gz linux-84d043185dbe0d1b4f6db575bd91c834d37e2f78.tar.bz2 linux-84d043185dbe0d1b4f6db575bd91c834d37e2f78.zip |
spi: Add a driver for the Freescale/NXP QuadSPI controller
This driver is derived from the SPI NOR driver at
mtd/spi-nor/fsl-quadspi.c. It uses the new SPI memory interface
of the SPI framework to issue flash memory operations to up to
four connected flash chips (2 buses with 2 CS each).
The controller does not support generic SPI messages.
This patch also disables the build of the "old" driver and reuses
its Kconfig option CONFIG_SPI_FSL_QUADSPI to replace it.
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Acked-by: Han Xu <han.xu@nxp.com>
Reviewed-by: Yogesh Gaur <yogeshnarayan.gaur@nxp.com>
Tested-by: Yogesh Gaur <yogeshnarayan.gaur@nxp.com>
Tested-by: Han Xu <han.xu@nxp.com>
Reviewed-by: Boris Brezillon <bbrezillon@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-fsl-qspi.c')
-rw-r--r-- | drivers/spi/spi-fsl-qspi.c | 966 |
1 files changed, 966 insertions, 0 deletions
diff --git a/drivers/spi/spi-fsl-qspi.c b/drivers/spi/spi-fsl-qspi.c new file mode 100644 index 000000000000..f0a340026ba4 --- /dev/null +++ b/drivers/spi/spi-fsl-qspi.c @@ -0,0 +1,966 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/* + * Freescale QuadSPI driver. + * + * Copyright (C) 2013 Freescale Semiconductor, Inc. + * Copyright (C) 2018 Bootlin + * Copyright (C) 2018 exceet electronics GmbH + * Copyright (C) 2018 Kontron Electronics GmbH + * + * Transition to SPI MEM interface: + * Authors: + * Boris Brezillion <boris.brezillon@bootlin.com> + * Frieder Schrempf <frieder.schrempf@kontron.de> + * Yogesh Gaur <yogeshnarayan.gaur@nxp.com> + * Suresh Gupta <suresh.gupta@nxp.com> + * + * Based on the original fsl-quadspi.c spi-nor driver: + * Author: Freescale Semiconductor, Inc. + * + */ + +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_qos.h> +#include <linux/sizes.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> + +/* + * The driver only uses one single LUT entry, that is updated on + * each call of exec_op(). Index 0 is preset at boot with a basic + * read operation, so let's use the last entry (15). + */ +#define SEQID_LUT 15 + +/* Registers used by the driver */ +#define QUADSPI_MCR 0x00 +#define QUADSPI_MCR_RESERVED_MASK GENMASK(19, 16) +#define QUADSPI_MCR_MDIS_MASK BIT(14) +#define QUADSPI_MCR_CLR_TXF_MASK BIT(11) +#define QUADSPI_MCR_CLR_RXF_MASK BIT(10) +#define QUADSPI_MCR_DDR_EN_MASK BIT(7) +#define QUADSPI_MCR_END_CFG_MASK GENMASK(3, 2) +#define QUADSPI_MCR_SWRSTHD_MASK BIT(1) +#define QUADSPI_MCR_SWRSTSD_MASK BIT(0) + +#define QUADSPI_IPCR 0x08 +#define QUADSPI_IPCR_SEQID(x) ((x) << 24) + +#define QUADSPI_BUF3CR 0x1c +#define QUADSPI_BUF3CR_ALLMST_MASK BIT(31) +#define QUADSPI_BUF3CR_ADATSZ(x) ((x) << 8) +#define QUADSPI_BUF3CR_ADATSZ_MASK GENMASK(15, 8) + +#define QUADSPI_BFGENCR 0x20 +#define QUADSPI_BFGENCR_SEQID(x) ((x) << 12) + +#define QUADSPI_BUF0IND 0x30 +#define QUADSPI_BUF1IND 0x34 +#define QUADSPI_BUF2IND 0x38 +#define QUADSPI_SFAR 0x100 + +#define QUADSPI_SMPR 0x108 +#define QUADSPI_SMPR_DDRSMP_MASK GENMASK(18, 16) +#define QUADSPI_SMPR_FSDLY_MASK BIT(6) +#define QUADSPI_SMPR_FSPHS_MASK BIT(5) +#define QUADSPI_SMPR_HSENA_MASK BIT(0) + +#define QUADSPI_RBCT 0x110 +#define QUADSPI_RBCT_WMRK_MASK GENMASK(4, 0) +#define QUADSPI_RBCT_RXBRD_USEIPS BIT(8) + +#define QUADSPI_TBDR 0x154 + +#define QUADSPI_SR 0x15c +#define QUADSPI_SR_IP_ACC_MASK BIT(1) +#define QUADSPI_SR_AHB_ACC_MASK BIT(2) + +#define QUADSPI_FR 0x160 +#define QUADSPI_FR_TFF_MASK BIT(0) + +#define QUADSPI_SPTRCLR 0x16c +#define QUADSPI_SPTRCLR_IPPTRC BIT(8) +#define QUADSPI_SPTRCLR_BFPTRC BIT(0) + +#define QUADSPI_SFA1AD 0x180 +#define QUADSPI_SFA2AD 0x184 +#define QUADSPI_SFB1AD 0x188 +#define QUADSPI_SFB2AD 0x18c +#define QUADSPI_RBDR(x) (0x200 + ((x) * 4)) + +#define QUADSPI_LUTKEY 0x300 +#define QUADSPI_LUTKEY_VALUE 0x5AF05AF0 + +#define QUADSPI_LCKCR 0x304 +#define QUADSPI_LCKER_LOCK BIT(0) +#define QUADSPI_LCKER_UNLOCK BIT(1) + +#define QUADSPI_RSER 0x164 +#define QUADSPI_RSER_TFIE BIT(0) + +#define QUADSPI_LUT_BASE 0x310 +#define QUADSPI_LUT_OFFSET (SEQID_LUT * 4 * 4) +#define QUADSPI_LUT_REG(idx) \ + (QUADSPI_LUT_BASE + QUADSPI_LUT_OFFSET + (idx) * 4) + +/* 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_FSL_READ 7 +#define LUT_FSL_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_FSL_READ_DDR 14 +#define LUT_FSL_WRITE_DDR 15 +#define LUT_DATA_LEARN 16 + +/* + * The PAD definitions for LUT register. + * + * The pad stands for the number of IO lines [0:3]. + * For example, the quad read needs four IO lines, + * so you should use LUT_PAD(4). + */ +#define LUT_PAD(x) (fls(x) - 1) + +/* + * Macro for constructing the LUT entries with the following + * register layout: + * + * --------------------------------------------------- + * | INSTR1 | PAD1 | OPRND1 | INSTR0 | PAD0 | OPRND0 | + * --------------------------------------------------- + */ +#define LUT_DEF(idx, ins, pad, opr) \ + ((((ins) << 10) | ((pad) << 8) | (opr)) << (((idx) % 2) * 16)) + +/* Controller needs driver to swap endianness */ +#define QUADSPI_QUIRK_SWAP_ENDIAN BIT(0) + +/* Controller needs 4x internal clock */ +#define QUADSPI_QUIRK_4X_INT_CLK BIT(1) + +/* + * TKT253890, the controller needs the driver to fill the txfifo with + * 16 bytes at least to trigger a data transfer, even though the extra + * data won't be transferred. + */ +#define QUADSPI_QUIRK_TKT253890 BIT(2) + +/* TKT245618, the controller cannot wake up from wait mode */ +#define QUADSPI_QUIRK_TKT245618 BIT(3) + +/* + * Controller adds QSPI_AMBA_BASE (base address of the mapped memory) + * internally. No need to add it when setting SFXXAD and SFAR registers + */ +#define QUADSPI_QUIRK_BASE_INTERNAL BIT(4) + +struct fsl_qspi_devtype_data { + unsigned int rxfifo; + unsigned int txfifo; + unsigned int ahb_buf_size; + unsigned int quirks; + bool little_endian; +}; + +static const struct fsl_qspi_devtype_data vybrid_data = { + .rxfifo = SZ_128, + .txfifo = SZ_64, + .ahb_buf_size = SZ_1K, + .quirks = QUADSPI_QUIRK_SWAP_ENDIAN, + .little_endian = true, +}; + +static const struct fsl_qspi_devtype_data imx6sx_data = { + .rxfifo = SZ_128, + .txfifo = SZ_512, + .ahb_buf_size = SZ_1K, + .quirks = QUADSPI_QUIRK_4X_INT_CLK | QUADSPI_QUIRK_TKT245618, + .little_endian = true, +}; + +static const struct fsl_qspi_devtype_data imx7d_data = { + .rxfifo = SZ_512, + .txfifo = SZ_512, + .ahb_buf_size = SZ_1K, + .quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_4X_INT_CLK, + .little_endian = true, +}; + +static const struct fsl_qspi_devtype_data imx6ul_data = { + .rxfifo = SZ_128, + .txfifo = SZ_512, + .ahb_buf_size = SZ_1K, + .quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_4X_INT_CLK, + .little_endian = true, +}; + +static const struct fsl_qspi_devtype_data ls1021a_data = { + .rxfifo = SZ_128, + .txfifo = SZ_64, + .ahb_buf_size = SZ_1K, + .quirks = 0, + .little_endian = false, +}; + +static const struct fsl_qspi_devtype_data ls2080a_data = { + .rxfifo = SZ_128, + .txfifo = SZ_64, + .ahb_buf_size = SZ_1K, + .quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_BASE_INTERNAL, + .little_endian = true, +}; + +struct fsl_qspi { + void __iomem *iobase; + void __iomem *ahb_addr; + u32 memmap_phy; + struct clk *clk, *clk_en; + struct device *dev; + struct completion c; + const struct fsl_qspi_devtype_data *devtype_data; + struct mutex lock; + struct pm_qos_request pm_qos_req; + int selected; +}; + +static inline int needs_swap_endian(struct fsl_qspi *q) +{ + return q->devtype_data->quirks & QUADSPI_QUIRK_SWAP_ENDIAN; +} + +static inline int needs_4x_clock(struct fsl_qspi *q) +{ + return q->devtype_data->quirks & QUADSPI_QUIRK_4X_INT_CLK; +} + +static inline int needs_fill_txfifo(struct fsl_qspi *q) +{ + return q->devtype_data->quirks & QUADSPI_QUIRK_TKT253890; +} + +static inline int needs_wakeup_wait_mode(struct fsl_qspi *q) +{ + return q->devtype_data->quirks & QUADSPI_QUIRK_TKT245618; +} + +static inline int needs_amba_base_offset(struct fsl_qspi *q) +{ + return !(q->devtype_data->quirks & QUADSPI_QUIRK_BASE_INTERNAL); +} + +/* + * An IC bug makes it necessary to rearrange the 32-bit data. + * Later chips, such as IMX6SLX, have fixed this bug. + */ +static inline u32 fsl_qspi_endian_xchg(struct fsl_qspi *q, u32 a) +{ + return needs_swap_endian(q) ? __swab32(a) : a; +} + +/* + * R/W functions for big- or little-endian registers: + * The QSPI controller's endianness is independent of + * the CPU core's endianness. So far, although the CPU + * core is little-endian the QSPI controller can use + * big-endian or little-endian. + */ +static void qspi_writel(struct fsl_qspi *q, u32 val, void __iomem *addr) +{ + if (q->devtype_data->little_endian) + iowrite32(val, addr); + else + iowrite32be(val, addr); +} + +static u32 qspi_readl(struct fsl_qspi *q, void __iomem *addr) +{ + if (q->devtype_data->little_endian) + return ioread32(addr); + + return ioread32be(addr); +} + +static irqreturn_t fsl_qspi_irq_handler(int irq, void *dev_id) +{ + struct fsl_qspi *q = dev_id; + u32 reg; + + /* clear interrupt */ + reg = qspi_readl(q, q->iobase + QUADSPI_FR); + qspi_writel(q, 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", 0, reg); + return IRQ_HANDLED; +} + +static int fsl_qspi_check_buswidth(struct fsl_qspi *q, u8 width) +{ + switch (width) { + case 1: + case 2: + case 4: + return 0; + } + + return -ENOTSUPP; +} + +static bool fsl_qspi_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->master); + int ret; + + ret = fsl_qspi_check_buswidth(q, op->cmd.buswidth); + + if (op->addr.nbytes) + ret |= fsl_qspi_check_buswidth(q, op->addr.buswidth); + + if (op->dummy.nbytes) + ret |= fsl_qspi_check_buswidth(q, op->dummy.buswidth); + + if (op->data.nbytes) + ret |= fsl_qspi_check_buswidth(q, op->data.buswidth); + + if (ret) + return false; + + /* + * The number of instructions needed for the op, needs + * to fit into a single LUT entry. + */ + if (op->addr.nbytes + + (op->dummy.nbytes ? 1:0) + + (op->data.nbytes ? 1:0) > 6) + return false; + + /* Max 64 dummy clock cycles supported */ + if (op->dummy.nbytes && + (op->dummy.nbytes * 8 / op->dummy.buswidth > 64)) + return false; + + /* Max data length, check controller limits and alignment */ + if (op->data.dir == SPI_MEM_DATA_IN && + (op->data.nbytes > q->devtype_data->ahb_buf_size || + (op->data.nbytes > q->devtype_data->rxfifo - 4 && + !IS_ALIGNED(op->data.nbytes, 8)))) + return false; + + if (op->data.dir == SPI_MEM_DATA_OUT && + op->data.nbytes > q->devtype_data->txfifo) + return false; + + return true; +} + +static void fsl_qspi_prepare_lut(struct fsl_qspi *q, + const struct spi_mem_op *op) +{ + void __iomem *base = q->iobase; + u32 lutval[4] = {}; + int lutidx = 1, i; + + lutval[0] |= LUT_DEF(0, LUT_CMD, LUT_PAD(op->cmd.buswidth), + op->cmd.opcode); + + /* + * For some unknown reason, using LUT_ADDR doesn't work in some + * cases (at least with only one byte long addresses), so + * let's use LUT_MODE to write the address bytes one by one + */ + for (i = 0; i < op->addr.nbytes; i++) { + u8 addrbyte = op->addr.val >> (8 * (op->addr.nbytes - i - 1)); + + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_MODE, + LUT_PAD(op->addr.buswidth), + addrbyte); + lutidx++; + } + + if (op->dummy.nbytes) { + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_DUMMY, + LUT_PAD(op->dummy.buswidth), + op->dummy.nbytes * 8 / + op->dummy.buswidth); + lutidx++; + } + + if (op->data.nbytes) { + lutval[lutidx / 2] |= LUT_DEF(lutidx, + op->data.dir == SPI_MEM_DATA_IN ? + LUT_FSL_READ : LUT_FSL_WRITE, + LUT_PAD(op->data.buswidth), + 0); + lutidx++; + } + + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_STOP, 0, 0); + + /* unlock LUT */ + qspi_writel(q, QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY); + qspi_writel(q, QUADSPI_LCKER_UNLOCK, q->iobase + QUADSPI_LCKCR); + + /* fill LUT */ + for (i = 0; i < ARRAY_SIZE(lutval); i++) + qspi_writel(q, lutval[i], base + QUADSPI_LUT_REG(i)); + + /* lock LUT */ + qspi_writel(q, QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY); + qspi_writel(q, QUADSPI_LCKER_LOCK, q->iobase + QUADSPI_LCKCR); +} + +static int fsl_qspi_clk_prep_enable(struct fsl_qspi *q) +{ + int ret; + + ret = clk_prepare_enable(q->clk_en); + if (ret) + return ret; + + ret = clk_prepare_enable(q->clk); + if (ret) { + clk_disable_unprepare(q->clk_en); + return ret; + } + + if (needs_wakeup_wait_mode(q)) + pm_qos_add_request(&q->pm_qos_req, PM_QOS_CPU_DMA_LATENCY, 0); + + return 0; +} + +static void fsl_qspi_clk_disable_unprep(struct fsl_qspi *q) +{ + if (needs_wakeup_wait_mode(q)) + pm_qos_remove_request(&q->pm_qos_req); + + clk_disable_unprepare(q->clk); + clk_disable_unprepare(q->clk_en); +} + +/* + * If we have changed the content of the flash by writing or erasing, or if we + * read from flash with a different offset into the page buffer, 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 void fsl_qspi_invalidate(struct fsl_qspi *q) +{ + u32 reg; + + reg = qspi_readl(q, q->iobase + QUADSPI_MCR); + reg |= QUADSPI_MCR_SWRSTHD_MASK | QUADSPI_MCR_SWRSTSD_MASK; + qspi_writel(q, 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); + qspi_writel(q, reg, q->iobase + QUADSPI_MCR); +} + +static void fsl_qspi_select_mem(struct fsl_qspi *q, struct spi_device *spi) +{ + unsigned long rate = spi->max_speed_hz; + int ret; + + if (q->selected == spi->chip_select) + return; + + if (needs_4x_clock(q)) + rate *= 4; + + fsl_qspi_clk_disable_unprep(q); + + ret = clk_set_rate(q->clk, rate); + if (ret) + return; + + ret = fsl_qspi_clk_prep_enable(q); + if (ret) + return; + + q->selected = spi->chip_select; + + fsl_qspi_invalidate(q); +} + +static void fsl_qspi_read_ahb(struct fsl_qspi *q, const struct spi_mem_op *op) +{ + memcpy_fromio(op->data.buf.in, + q->ahb_addr + q->selected * q->devtype_data->ahb_buf_size, + op->data.nbytes); +} + +static void fsl_qspi_fill_txfifo(struct fsl_qspi *q, + const struct spi_mem_op *op) +{ + void __iomem *base = q->iobase; + int i; + u32 val; + + for (i = 0; i < ALIGN_DOWN(op->data.nbytes, 4); i += 4) { + memcpy(&val, op->data.buf.out + i, 4); + val = fsl_qspi_endian_xchg(q, val); + qspi_writel(q, val, base + QUADSPI_TBDR); + } + + if (i < op->data.nbytes) { + memcpy(&val, op->data.buf.out + i, op->data.nbytes - i); + val = fsl_qspi_endian_xchg(q, val); + qspi_writel(q, val, base + QUADSPI_TBDR); + } + + if (needs_fill_txfifo(q)) { + for (i = op->data.nbytes; i < 16; i += 4) + qspi_writel(q, 0, base + QUADSPI_TBDR); + } +} + +static void fsl_qspi_read_rxfifo(struct fsl_qspi *q, + const struct spi_mem_op *op) +{ + void __iomem *base = q->iobase; + int i; + u8 *buf = op->data.buf.in; + u32 val; + + for (i = 0; i < ALIGN_DOWN(op->data.nbytes, 4); i += 4) { + val = qspi_readl(q, base + QUADSPI_RBDR(i / 4)); + val = fsl_qspi_endian_xchg(q, val); + memcpy(buf + i, &val, 4); + } + + if (i < op->data.nbytes) { + val = qspi_readl(q, base + QUADSPI_RBDR(i / 4)); + val = fsl_qspi_endian_xchg(q, val); + memcpy(buf + i, &val, op->data.nbytes - i); + } +} + +static int fsl_qspi_do_op(struct fsl_qspi *q, const struct spi_mem_op *op) +{ + void __iomem *base = q->iobase; + int err = 0; + + init_completion(&q->c); + + /* + * Always start the sequence at the same index since we update + * the LUT at each exec_op() call. And also specify the DATA + * length, since it's has not been specified in the LUT. + */ + qspi_writel(q, op->data.nbytes | QUADSPI_IPCR_SEQID(SEQID_LUT), + base + QUADSPI_IPCR); + + /* Wait for the interrupt. */ + if (!wait_for_completion_timeout(&q->c, msecs_to_jiffies(1000))) + err = -ETIMEDOUT; + + if (!err && op->data.nbytes && op->data.dir == SPI_MEM_DATA_IN) + fsl_qspi_read_rxfifo(q, op); + + return err; +} + +static int fsl_qspi_readl_poll_tout(struct fsl_qspi *q, void __iomem *base, + u32 mask, u32 delay_us, u32 timeout_us) +{ + u32 reg; + + if (!q->devtype_data->little_endian) + mask = (u32)cpu_to_be32(mask); + + return readl_poll_timeout(base, reg, !(reg & mask), delay_us, + timeout_us); +} + +static int fsl_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->master); + void __iomem *base = q->iobase; + u32 addr_offset = 0; + int err = 0; + + mutex_lock(&q->lock); + + /* wait for the controller being ready */ + fsl_qspi_readl_poll_tout(q, base + QUADSPI_SR, (QUADSPI_SR_IP_ACC_MASK | + QUADSPI_SR_AHB_ACC_MASK), 10, 1000); + + fsl_qspi_select_mem(q, mem->spi); + + if (needs_amba_base_offset(q)) + addr_offset = q->memmap_phy; + + qspi_writel(q, + q->selected * q->devtype_data->ahb_buf_size + addr_offset, + base + QUADSPI_SFAR); + + qspi_writel(q, qspi_readl(q, base + QUADSPI_MCR) | + QUADSPI_MCR_CLR_RXF_MASK | QUADSPI_MCR_CLR_TXF_MASK, + base + QUADSPI_MCR); + + qspi_writel(q, QUADSPI_SPTRCLR_BFPTRC | QUADSPI_SPTRCLR_IPPTRC, + base + QUADSPI_SPTRCLR); + + fsl_qspi_prepare_lut(q, op); + + /* + * If we have large chunks of data, we read them through the AHB bus + * by accessing the mapped memory. In all other cases we use + * IP commands to access the flash. + */ + if (op->data.nbytes > (q->devtype_data->rxfifo - 4) && + op->data.dir == SPI_MEM_DATA_IN) { + fsl_qspi_read_ahb(q, op); + } else { + qspi_writel(q, QUADSPI_RBCT_WMRK_MASK | + QUADSPI_RBCT_RXBRD_USEIPS, base + QUADSPI_RBCT); + + if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT) + fsl_qspi_fill_txfifo(q, op); + + err = fsl_qspi_do_op(q, op); + } + + /* Invalidate the data in the AHB buffer. */ + fsl_qspi_invalidate(q); + + mutex_unlock(&q->lock); + + return err; +} + +static int fsl_qspi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) +{ + struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->master); + + if (op->data.dir == SPI_MEM_DATA_OUT) { + if (op->data.nbytes > q->devtype_data->txfifo) + op->data.nbytes = q->devtype_data->txfifo; + } else { + if (op->data.nbytes > q->devtype_data->ahb_buf_size) + op->data.nbytes = q->devtype_data->ahb_buf_size; + else if (op->data.nbytes > (q->devtype_data->rxfifo - 4)) + op->data.nbytes = ALIGN_DOWN(op->data.nbytes, 8); + } + + return 0; +} + +static int fsl_qspi_default_setup(struct fsl_qspi *q) +{ + void __iomem *base = q->iobase; + u32 reg, addr_offset = 0; + int ret; + + /* disable and unprepare clock to avoid glitch pass to controller */ + fsl_qspi_clk_disable_unprep(q); + + /* the default frequency, we will change it later if necessary. */ + ret = clk_set_rate(q->clk, 66000000); + if (ret) + return ret; + + ret = fsl_qspi_clk_prep_enable(q); + if (ret) + return ret; + + /* Reset the module */ + qspi_writel(q, QUADSPI_MCR_SWRSTSD_MASK | QUADSPI_MCR_SWRSTHD_MASK, + base + QUADSPI_MCR); + udelay(1); + + /* Disable the module */ + qspi_writel(q, QUADSPI_MCR_MDIS_MASK | QUADSPI_MCR_RESERVED_MASK, + base + QUADSPI_MCR); + + reg = qspi_readl(q, base + QUADSPI_SMPR); + qspi_writel(q, reg & ~(QUADSPI_SMPR_FSDLY_MASK + | QUADSPI_SMPR_FSPHS_MASK + | QUADSPI_SMPR_HSENA_MASK + | QUADSPI_SMPR_DDRSMP_MASK), base + QUADSPI_SMPR); + + /* We only use the buffer3 for AHB read */ + qspi_writel(q, 0, base + QUADSPI_BUF0IND); + qspi_writel(q, 0, base + QUADSPI_BUF1IND); + qspi_writel(q, 0, base + QUADSPI_BUF2IND); + + qspi_writel(q, QUADSPI_BFGENCR_SEQID(SEQID_LUT), + q->iobase + QUADSPI_BFGENCR); + qspi_writel(q, QUADSPI_RBCT_WMRK_MASK, base + QUADSPI_RBCT); + qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK | + QUADSPI_BUF3CR_ADATSZ(q->devtype_data->ahb_buf_size / 8), + base + QUADSPI_BUF3CR); + + if (needs_amba_base_offset(q)) + addr_offset = q->memmap_phy; + + /* + * In HW there can be a maximum of four chips on two buses with + * two chip selects on each bus. We use four chip selects in SW + * to differentiate between the four chips. + * We use ahb_buf_size for each chip and set SFA1AD, SFA2AD, SFB1AD, + * SFB2AD accordingly. + */ + qspi_writel(q, q->devtype_data->ahb_buf_size + addr_offset, + base + QUADSPI_SFA1AD); + qspi_writel(q, q->devtype_data->ahb_buf_size * 2 + addr_offset, + base + QUADSPI_SFA2AD); + qspi_writel(q, q->devtype_data->ahb_buf_size * 3 + addr_offset, + base + QUADSPI_SFB1AD); + qspi_writel(q, q->devtype_data->ahb_buf_size * 4 + addr_offset, + base + QUADSPI_SFB2AD); + + q->selected = -1; + + /* Enable the module */ + qspi_writel(q, QUADSPI_MCR_RESERVED_MASK | QUADSPI_MCR_END_CFG_MASK, + base + QUADSPI_MCR); + + /* clear all interrupt status */ + qspi_writel(q, 0xffffffff, q->iobase + QUADSPI_FR); + + /* enable the interrupt */ + qspi_writel(q, QUADSPI_RSER_TFIE, q->iobase + QUADSPI_RSER); + + return 0; +} + +static const char *fsl_qspi_get_name(struct spi_mem *mem) +{ + struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->master); + struct device *dev = &mem->spi->dev; + const char *name; + + /* + * In order to keep mtdparts compatible with the old MTD driver at + * mtd/spi-nor/fsl-quadspi.c, we set a custom name derived from the + * platform_device of the controller. + */ + if (of_get_available_child_count(q->dev->of_node) == 1) + return dev_name(q->dev); + + name = devm_kasprintf(dev, GFP_KERNEL, + "%s-%d", dev_name(q->dev), + mem->spi->chip_select); + + if (!name) { + dev_err(dev, "failed to get memory for custom flash name\n"); + return ERR_PTR(-ENOMEM); + } + + return name; +} + +static const struct spi_controller_mem_ops fsl_qspi_mem_ops = { + .adjust_op_size = fsl_qspi_adjust_op_size, + .supports_op = fsl_qspi_supports_op, + .exec_op = fsl_qspi_exec_op, + .get_name = fsl_qspi_get_name, +}; + +static int fsl_qspi_probe(struct platform_device *pdev) +{ + struct spi_controller *ctlr; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct resource *res; + struct fsl_qspi *q; + int ret; + + ctlr = spi_alloc_master(&pdev->dev, sizeof(*q)); + if (!ctlr) + return -ENOMEM; + + ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | + SPI_TX_DUAL | SPI_TX_QUAD; + + q = spi_controller_get_devdata(ctlr); + q->dev = dev; + q->devtype_data = of_device_get_match_data(dev); + if (!q->devtype_data) { + ret = -ENODEV; + goto err_put_ctrl; + } + + platform_set_drvdata(pdev, q); + + /* 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 err_put_ctrl; + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "QuadSPI-memory"); + q->ahb_addr = devm_ioremap_resource(dev, res); + if (IS_ERR(q->ahb_addr)) { + ret = PTR_ERR(q->ahb_addr); + goto err_put_ctrl; + } + + 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 err_put_ctrl; + } + + q->clk = devm_clk_get(dev, "qspi"); + if (IS_ERR(q->clk)) { + ret = PTR_ERR(q->clk); + goto err_put_ctrl; + } + + ret = fsl_qspi_clk_prep_enable(q); + if (ret) { + dev_err(dev, "can not enable the clock\n"); + goto err_put_ctrl; + } + + /* find the irq */ + ret = platform_get_irq(pdev, 0); + if (ret < 0) { + dev_err(dev, "failed to get the irq: %d\n", ret); + goto err_disable_clk; + } + + ret = devm_request_irq(dev, ret, + fsl_qspi_irq_handler, 0, pdev->name, q); + if (ret) { + dev_err(dev, "failed to request irq: %d\n", ret); + goto err_disable_clk; + } + + mutex_init(&q->lock); + + ctlr->bus_num = -1; + ctlr->num_chipselect = 4; + ctlr->mem_ops = &fsl_qspi_mem_ops; + + fsl_qspi_default_setup(q); + + ctlr->dev.of_node = np; + + ret = spi_register_controller(ctlr); + if (ret) + goto err_destroy_mutex; + + return 0; + +err_destroy_mutex: + mutex_destroy(&q->lock); + +err_disable_clk: + fsl_qspi_clk_disable_unprep(q); + +err_put_ctrl: + spi_controller_put(ctlr); + + 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); + + /* disable the hardware */ + qspi_writel(q, QUADSPI_MCR_MDIS_MASK, q->iobase + QUADSPI_MCR); + qspi_writel(q, 0x0, q->iobase + QUADSPI_RSER); + + fsl_qspi_clk_disable_unprep(q); + + mutex_destroy(&q->lock); + + return 0; +} + +static int fsl_qspi_suspend(struct device *dev) +{ + return 0; +} + +static int fsl_qspi_resume(struct device *dev) +{ + struct fsl_qspi *q = dev_get_drvdata(dev); + + fsl_qspi_default_setup(q); + + return 0; +} + +static const struct of_device_id fsl_qspi_dt_ids[] = { + { .compatible = "fsl,vf610-qspi", .data = &vybrid_data, }, + { .compatible = "fsl,imx6sx-qspi", .data = &imx6sx_data, }, + { .compatible = "fsl,imx7d-qspi", .data = &imx7d_data, }, + { .compatible = "fsl,imx6ul-qspi", .data = &imx6ul_data, }, + { .compatible = "fsl,ls1021a-qspi", .data = &ls1021a_data, }, + { .compatible = "fsl,ls2080a-qspi", .data = &ls2080a_data, }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, fsl_qspi_dt_ids); + +static const struct dev_pm_ops fsl_qspi_pm_ops = { + .suspend = fsl_qspi_suspend, + .resume = fsl_qspi_resume, +}; + +static struct platform_driver fsl_qspi_driver = { + .driver = { + .name = "fsl-quadspi", + .of_match_table = fsl_qspi_dt_ids, + .pm = &fsl_qspi_pm_ops, + }, + .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_AUTHOR("Boris Brezillion <boris.brezillon@bootlin.com>"); +MODULE_AUTHOR("Frieder Schrempf <frieder.schrempf@kontron.de>"); +MODULE_AUTHOR("Yogesh Gaur <yogeshnarayan.gaur@nxp.com>"); +MODULE_AUTHOR("Suresh Gupta <suresh.gupta@nxp.com>"); +MODULE_LICENSE("GPL v2"); |