diff options
Diffstat (limited to 'drivers/mtd/spi-nor/nxp-spifi.c')
| -rw-r--r-- | drivers/mtd/spi-nor/nxp-spifi.c | 482 |
1 files changed, 482 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/nxp-spifi.c b/drivers/mtd/spi-nor/nxp-spifi.c new file mode 100644 index 000000000..9ad1dd089 --- /dev/null +++ b/drivers/mtd/spi-nor/nxp-spifi.c @@ -0,0 +1,482 @@ +/* + * SPI-NOR driver for NXP SPI Flash Interface (SPIFI) + * + * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com> + * + * Based on 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 version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> +#include <linux/mtd/spi-nor.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> + +/* NXP SPIFI registers, bits and macros */ +#define SPIFI_CTRL 0x000 +#define SPIFI_CTRL_TIMEOUT(timeout) (timeout) +#define SPIFI_CTRL_CSHIGH(cshigh) ((cshigh) << 16) +#define SPIFI_CTRL_MODE3 BIT(23) +#define SPIFI_CTRL_DUAL BIT(28) +#define SPIFI_CTRL_FBCLK BIT(30) +#define SPIFI_CMD 0x004 +#define SPIFI_CMD_DATALEN(dlen) ((dlen) & 0x3fff) +#define SPIFI_CMD_DOUT BIT(15) +#define SPIFI_CMD_INTLEN(ilen) ((ilen) << 16) +#define SPIFI_CMD_FIELDFORM(field) ((field) << 19) +#define SPIFI_CMD_FIELDFORM_ALL_SERIAL SPIFI_CMD_FIELDFORM(0x0) +#define SPIFI_CMD_FIELDFORM_QUAD_DUAL_DATA SPIFI_CMD_FIELDFORM(0x1) +#define SPIFI_CMD_FRAMEFORM(frame) ((frame) << 21) +#define SPIFI_CMD_FRAMEFORM_OPCODE_ONLY SPIFI_CMD_FRAMEFORM(0x1) +#define SPIFI_CMD_OPCODE(op) ((op) << 24) +#define SPIFI_ADDR 0x008 +#define SPIFI_IDATA 0x00c +#define SPIFI_CLIMIT 0x010 +#define SPIFI_DATA 0x014 +#define SPIFI_MCMD 0x018 +#define SPIFI_STAT 0x01c +#define SPIFI_STAT_MCINIT BIT(0) +#define SPIFI_STAT_CMD BIT(1) +#define SPIFI_STAT_RESET BIT(4) + +#define SPI_NOR_MAX_ID_LEN 6 + +struct nxp_spifi { + struct device *dev; + struct clk *clk_spifi; + struct clk *clk_reg; + void __iomem *io_base; + void __iomem *flash_base; + struct mtd_info mtd; + struct spi_nor nor; + bool memory_mode; + u32 mcmd; +}; + +static int nxp_spifi_wait_for_cmd(struct nxp_spifi *spifi) +{ + u8 stat; + int ret; + + ret = readb_poll_timeout(spifi->io_base + SPIFI_STAT, stat, + !(stat & SPIFI_STAT_CMD), 10, 30); + if (ret) + dev_warn(spifi->dev, "command timed out\n"); + + return ret; +} + +static int nxp_spifi_reset(struct nxp_spifi *spifi) +{ + u8 stat; + int ret; + + writel(SPIFI_STAT_RESET, spifi->io_base + SPIFI_STAT); + ret = readb_poll_timeout(spifi->io_base + SPIFI_STAT, stat, + !(stat & SPIFI_STAT_RESET), 10, 30); + if (ret) + dev_warn(spifi->dev, "state reset timed out\n"); + + return ret; +} + +static int nxp_spifi_set_memory_mode_off(struct nxp_spifi *spifi) +{ + int ret; + + if (!spifi->memory_mode) + return 0; + + ret = nxp_spifi_reset(spifi); + if (ret) + dev_err(spifi->dev, "unable to enter command mode\n"); + else + spifi->memory_mode = false; + + return ret; +} + +static int nxp_spifi_set_memory_mode_on(struct nxp_spifi *spifi) +{ + u8 stat; + int ret; + + if (spifi->memory_mode) + return 0; + + writel(spifi->mcmd, spifi->io_base + SPIFI_MCMD); + ret = readb_poll_timeout(spifi->io_base + SPIFI_STAT, stat, + stat & SPIFI_STAT_MCINIT, 10, 30); + if (ret) + dev_err(spifi->dev, "unable to enter memory mode\n"); + else + spifi->memory_mode = true; + + return ret; +} + +static int nxp_spifi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len) +{ + struct nxp_spifi *spifi = nor->priv; + u32 cmd; + int ret; + + ret = nxp_spifi_set_memory_mode_off(spifi); + if (ret) + return ret; + + cmd = SPIFI_CMD_DATALEN(len) | + SPIFI_CMD_OPCODE(opcode) | + SPIFI_CMD_FIELDFORM_ALL_SERIAL | + SPIFI_CMD_FRAMEFORM_OPCODE_ONLY; + writel(cmd, spifi->io_base + SPIFI_CMD); + + while (len--) + *buf++ = readb(spifi->io_base + SPIFI_DATA); + + return nxp_spifi_wait_for_cmd(spifi); +} + +static int nxp_spifi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, + int len, int write_enable) +{ + struct nxp_spifi *spifi = nor->priv; + u32 cmd; + int ret; + + ret = nxp_spifi_set_memory_mode_off(spifi); + if (ret) + return ret; + + cmd = SPIFI_CMD_DOUT | + SPIFI_CMD_DATALEN(len) | + SPIFI_CMD_OPCODE(opcode) | + SPIFI_CMD_FIELDFORM_ALL_SERIAL | + SPIFI_CMD_FRAMEFORM_OPCODE_ONLY; + writel(cmd, spifi->io_base + SPIFI_CMD); + + while (len--) + writeb(*buf++, spifi->io_base + SPIFI_DATA); + + return nxp_spifi_wait_for_cmd(spifi); +} + +static int nxp_spifi_read(struct spi_nor *nor, loff_t from, size_t len, + size_t *retlen, u_char *buf) +{ + struct nxp_spifi *spifi = nor->priv; + int ret; + + ret = nxp_spifi_set_memory_mode_on(spifi); + if (ret) + return ret; + + memcpy_fromio(buf, spifi->flash_base + from, len); + *retlen += len; + + return 0; +} + +static void nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len, + size_t *retlen, const u_char *buf) +{ + struct nxp_spifi *spifi = nor->priv; + u32 cmd; + int ret; + + ret = nxp_spifi_set_memory_mode_off(spifi); + if (ret) + return; + + writel(to, spifi->io_base + SPIFI_ADDR); + *retlen += len; + + cmd = SPIFI_CMD_DOUT | + SPIFI_CMD_DATALEN(len) | + SPIFI_CMD_FIELDFORM_ALL_SERIAL | + SPIFI_CMD_OPCODE(nor->program_opcode) | + SPIFI_CMD_FRAMEFORM(spifi->nor.addr_width + 1); + writel(cmd, spifi->io_base + SPIFI_CMD); + + while (len--) + writeb(*buf++, spifi->io_base + SPIFI_DATA); + + nxp_spifi_wait_for_cmd(spifi); +} + +static int nxp_spifi_erase(struct spi_nor *nor, loff_t offs) +{ + struct nxp_spifi *spifi = nor->priv; + u32 cmd; + int ret; + + ret = nxp_spifi_set_memory_mode_off(spifi); + if (ret) + return ret; + + writel(offs, spifi->io_base + SPIFI_ADDR); + + cmd = SPIFI_CMD_FIELDFORM_ALL_SERIAL | + SPIFI_CMD_OPCODE(nor->erase_opcode) | + SPIFI_CMD_FRAMEFORM(spifi->nor.addr_width + 1); + writel(cmd, spifi->io_base + SPIFI_CMD); + + return nxp_spifi_wait_for_cmd(spifi); +} + +static int nxp_spifi_setup_memory_cmd(struct nxp_spifi *spifi) +{ + switch (spifi->nor.flash_read) { + case SPI_NOR_NORMAL: + case SPI_NOR_FAST: + spifi->mcmd = SPIFI_CMD_FIELDFORM_ALL_SERIAL; + break; + case SPI_NOR_DUAL: + case SPI_NOR_QUAD: + spifi->mcmd = SPIFI_CMD_FIELDFORM_QUAD_DUAL_DATA; + break; + default: + dev_err(spifi->dev, "unsupported SPI read mode\n"); + return -EINVAL; + } + + /* Memory mode supports address length between 1 and 4 */ + if (spifi->nor.addr_width < 1 || spifi->nor.addr_width > 4) + return -EINVAL; + + spifi->mcmd |= SPIFI_CMD_OPCODE(spifi->nor.read_opcode) | + SPIFI_CMD_INTLEN(spifi->nor.read_dummy / 8) | + SPIFI_CMD_FRAMEFORM(spifi->nor.addr_width + 1); + + return 0; +} + +static void nxp_spifi_dummy_id_read(struct spi_nor *nor) +{ + u8 id[SPI_NOR_MAX_ID_LEN]; + nor->read_reg(nor, SPINOR_OP_RDID, id, SPI_NOR_MAX_ID_LEN); +} + +static int nxp_spifi_setup_flash(struct nxp_spifi *spifi, + struct device_node *np) +{ + struct mtd_part_parser_data ppdata; + enum read_mode flash_read; + u32 ctrl, property; + u16 mode = 0; + int ret; + + if (!of_property_read_u32(np, "spi-rx-bus-width", &property)) { + switch (property) { + case 1: + break; + case 2: + mode |= SPI_RX_DUAL; + break; + case 4: + mode |= SPI_RX_QUAD; + break; + default: + dev_err(spifi->dev, "unsupported rx-bus-width\n"); + return -EINVAL; + } + } + + if (of_find_property(np, "spi-cpha", NULL)) + mode |= SPI_CPHA; + + if (of_find_property(np, "spi-cpol", NULL)) + mode |= SPI_CPOL; + + /* Setup control register defaults */ + ctrl = SPIFI_CTRL_TIMEOUT(1000) | + SPIFI_CTRL_CSHIGH(15) | + SPIFI_CTRL_FBCLK; + + if (mode & SPI_RX_DUAL) { + ctrl |= SPIFI_CTRL_DUAL; + flash_read = SPI_NOR_DUAL; + } else if (mode & SPI_RX_QUAD) { + ctrl &= ~SPIFI_CTRL_DUAL; + flash_read = SPI_NOR_QUAD; + } else { + ctrl |= SPIFI_CTRL_DUAL; + flash_read = SPI_NOR_NORMAL; + } + + switch (mode & (SPI_CPHA | SPI_CPOL)) { + case SPI_MODE_0: + ctrl &= ~SPIFI_CTRL_MODE3; + break; + case SPI_MODE_3: + ctrl |= SPIFI_CTRL_MODE3; + break; + default: + dev_err(spifi->dev, "only mode 0 and 3 supported\n"); + return -EINVAL; + } + + writel(ctrl, spifi->io_base + SPIFI_CTRL); + + spifi->mtd.priv = &spifi->nor; + spifi->nor.mtd = &spifi->mtd; + spifi->nor.dev = spifi->dev; + spifi->nor.priv = spifi; + spifi->nor.read = nxp_spifi_read; + spifi->nor.write = nxp_spifi_write; + spifi->nor.erase = nxp_spifi_erase; + spifi->nor.read_reg = nxp_spifi_read_reg; + spifi->nor.write_reg = nxp_spifi_write_reg; + + /* + * The first read on a hard reset isn't reliable so do a + * dummy read of the id before calling spi_nor_scan(). + * The reason for this problem is unknown. + * + * The official NXP spifilib uses more or less the same + * workaround that is applied here by reading the device + * id multiple times. + */ + nxp_spifi_dummy_id_read(&spifi->nor); + + ret = spi_nor_scan(&spifi->nor, NULL, flash_read); + if (ret) { + dev_err(spifi->dev, "device scan failed\n"); + return ret; + } + + ret = nxp_spifi_setup_memory_cmd(spifi); + if (ret) { + dev_err(spifi->dev, "memory command setup failed\n"); + return ret; + } + + ppdata.of_node = np; + ret = mtd_device_parse_register(&spifi->mtd, NULL, &ppdata, NULL, 0); + if (ret) { + dev_err(spifi->dev, "mtd device parse failed\n"); + return ret; + } + + return 0; +} + +static int nxp_spifi_probe(struct platform_device *pdev) +{ + struct device_node *flash_np; + struct nxp_spifi *spifi; + struct resource *res; + int ret; + + spifi = devm_kzalloc(&pdev->dev, sizeof(*spifi), GFP_KERNEL); + if (!spifi) + return -ENOMEM; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "spifi"); + spifi->io_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(spifi->io_base)) + return PTR_ERR(spifi->io_base); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "flash"); + spifi->flash_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(spifi->flash_base)) + return PTR_ERR(spifi->flash_base); + + spifi->clk_spifi = devm_clk_get(&pdev->dev, "spifi"); + if (IS_ERR(spifi->clk_spifi)) { + dev_err(&pdev->dev, "spifi clock not found\n"); + return PTR_ERR(spifi->clk_spifi); + } + + spifi->clk_reg = devm_clk_get(&pdev->dev, "reg"); + if (IS_ERR(spifi->clk_reg)) { + dev_err(&pdev->dev, "reg clock not found\n"); + return PTR_ERR(spifi->clk_reg); + } + + ret = clk_prepare_enable(spifi->clk_reg); + if (ret) { + dev_err(&pdev->dev, "unable to enable reg clock\n"); + return ret; + } + + ret = clk_prepare_enable(spifi->clk_spifi); + if (ret) { + dev_err(&pdev->dev, "unable to enable spifi clock\n"); + goto dis_clk_reg; + } + + spifi->dev = &pdev->dev; + platform_set_drvdata(pdev, spifi); + + /* Initialize and reset device */ + nxp_spifi_reset(spifi); + writel(0, spifi->io_base + SPIFI_IDATA); + writel(0, spifi->io_base + SPIFI_MCMD); + nxp_spifi_reset(spifi); + + flash_np = of_get_next_available_child(pdev->dev.of_node, NULL); + if (!flash_np) { + dev_err(&pdev->dev, "no SPI flash device to configure\n"); + ret = -ENODEV; + goto dis_clks; + } + + ret = nxp_spifi_setup_flash(spifi, flash_np); + if (ret) { + dev_err(&pdev->dev, "unable to setup flash chip\n"); + goto dis_clks; + } + + return 0; + +dis_clks: + clk_disable_unprepare(spifi->clk_spifi); +dis_clk_reg: + clk_disable_unprepare(spifi->clk_reg); + return ret; +} + +static int nxp_spifi_remove(struct platform_device *pdev) +{ + struct nxp_spifi *spifi = platform_get_drvdata(pdev); + + mtd_device_unregister(&spifi->mtd); + clk_disable_unprepare(spifi->clk_spifi); + clk_disable_unprepare(spifi->clk_reg); + + return 0; +} + +static const struct of_device_id nxp_spifi_match[] = { + {.compatible = "nxp,lpc1773-spifi"}, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, nxp_spifi_match); + +static struct platform_driver nxp_spifi_driver = { + .probe = nxp_spifi_probe, + .remove = nxp_spifi_remove, + .driver = { + .name = "nxp-spifi", + .of_match_table = nxp_spifi_match, + }, +}; +module_platform_driver(nxp_spifi_driver); + +MODULE_DESCRIPTION("NXP SPI Flash Interface driver"); +MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>"); +MODULE_LICENSE("GPL v2"); |