diff options
Diffstat (limited to 'drivers/mtd/nand/raw/tmio_nand.c')
| -rw-r--r-- | drivers/mtd/nand/raw/tmio_nand.c | 533 |
1 files changed, 533 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/tmio_nand.c b/drivers/mtd/nand/raw/tmio_nand.c new file mode 100644 index 000000000..8f1a42bf1 --- /dev/null +++ b/drivers/mtd/nand/raw/tmio_nand.c @@ -0,0 +1,533 @@ +/* + * Toshiba TMIO NAND flash controller driver + * + * Slightly murky pre-git history of the driver: + * + * Copyright (c) Ian Molton 2004, 2005, 2008 + * Original work, independent of sharps code. Included hardware ECC support. + * Hard ECC did not work for writes in the early revisions. + * Copyright (c) Dirk Opfer 2005. + * Modifications developed from sharps code but + * NOT containing any, ported onto Ians base. + * Copyright (c) Chris Humbert 2005 + * Copyright (c) Dmitry Baryshkov 2008 + * Minor fixes + * + * Parts copyright Sebastian Carlier + * + * This file is licensed under + * the terms of the GNU General Public License version 2. This program + * is licensed "as is" without any warranty of any kind, whether express + * or implied. + * + */ + + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/mfd/core.h> +#include <linux/mfd/tmio.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/rawnand.h> +#include <linux/mtd/partitions.h> +#include <linux/slab.h> + +/*--------------------------------------------------------------------------*/ + +/* + * NAND Flash Host Controller Configuration Register + */ +#define CCR_COMMAND 0x04 /* w Command */ +#define CCR_BASE 0x10 /* l NAND Flash Control Reg Base Addr */ +#define CCR_INTP 0x3d /* b Interrupt Pin */ +#define CCR_INTE 0x48 /* b Interrupt Enable */ +#define CCR_EC 0x4a /* b Event Control */ +#define CCR_ICC 0x4c /* b Internal Clock Control */ +#define CCR_ECCC 0x5b /* b ECC Control */ +#define CCR_NFTC 0x60 /* b NAND Flash Transaction Control */ +#define CCR_NFM 0x61 /* b NAND Flash Monitor */ +#define CCR_NFPSC 0x62 /* b NAND Flash Power Supply Control */ +#define CCR_NFDC 0x63 /* b NAND Flash Detect Control */ + +/* + * NAND Flash Control Register + */ +#define FCR_DATA 0x00 /* bwl Data Register */ +#define FCR_MODE 0x04 /* b Mode Register */ +#define FCR_STATUS 0x05 /* b Status Register */ +#define FCR_ISR 0x06 /* b Interrupt Status Register */ +#define FCR_IMR 0x07 /* b Interrupt Mask Register */ + +/* FCR_MODE Register Command List */ +#define FCR_MODE_DATA 0x94 /* Data Data_Mode */ +#define FCR_MODE_COMMAND 0x95 /* Data Command_Mode */ +#define FCR_MODE_ADDRESS 0x96 /* Data Address_Mode */ + +#define FCR_MODE_HWECC_CALC 0xB4 /* HW-ECC Data */ +#define FCR_MODE_HWECC_RESULT 0xD4 /* HW-ECC Calc result Read_Mode */ +#define FCR_MODE_HWECC_RESET 0xF4 /* HW-ECC Reset */ + +#define FCR_MODE_POWER_ON 0x0C /* Power Supply ON to SSFDC card */ +#define FCR_MODE_POWER_OFF 0x08 /* Power Supply OFF to SSFDC card */ + +#define FCR_MODE_LED_OFF 0x00 /* LED OFF */ +#define FCR_MODE_LED_ON 0x04 /* LED ON */ + +#define FCR_MODE_EJECT_ON 0x68 /* Ejection events active */ +#define FCR_MODE_EJECT_OFF 0x08 /* Ejection events ignored */ + +#define FCR_MODE_LOCK 0x6C /* Lock_Mode. Eject Switch Invalid */ +#define FCR_MODE_UNLOCK 0x0C /* UnLock_Mode. Eject Switch is valid */ + +#define FCR_MODE_CONTROLLER_ID 0x40 /* Controller ID Read */ +#define FCR_MODE_STANDBY 0x00 /* SSFDC card Changes Standby State */ + +#define FCR_MODE_WE 0x80 +#define FCR_MODE_ECC1 0x40 +#define FCR_MODE_ECC0 0x20 +#define FCR_MODE_CE 0x10 +#define FCR_MODE_PCNT1 0x08 +#define FCR_MODE_PCNT0 0x04 +#define FCR_MODE_ALE 0x02 +#define FCR_MODE_CLE 0x01 + +#define FCR_STATUS_BUSY 0x80 + +/*--------------------------------------------------------------------------*/ + +struct tmio_nand { + struct nand_controller controller; + struct nand_chip chip; + struct completion comp; + + struct platform_device *dev; + + void __iomem *ccr; + void __iomem *fcr; + unsigned long fcr_base; + + unsigned int irq; + + /* for tmio_nand_read_byte */ + u8 read; + unsigned read_good:1; +}; + +static inline struct tmio_nand *mtd_to_tmio(struct mtd_info *mtd) +{ + return container_of(mtd_to_nand(mtd), struct tmio_nand, chip); +} + + +/*--------------------------------------------------------------------------*/ + +static void tmio_nand_hwcontrol(struct nand_chip *chip, int cmd, + unsigned int ctrl) +{ + struct tmio_nand *tmio = mtd_to_tmio(nand_to_mtd(chip)); + + if (ctrl & NAND_CTRL_CHANGE) { + u8 mode; + + if (ctrl & NAND_NCE) { + mode = FCR_MODE_DATA; + + if (ctrl & NAND_CLE) + mode |= FCR_MODE_CLE; + else + mode &= ~FCR_MODE_CLE; + + if (ctrl & NAND_ALE) + mode |= FCR_MODE_ALE; + else + mode &= ~FCR_MODE_ALE; + } else { + mode = FCR_MODE_STANDBY; + } + + tmio_iowrite8(mode, tmio->fcr + FCR_MODE); + tmio->read_good = 0; + } + + if (cmd != NAND_CMD_NONE) + tmio_iowrite8(cmd, chip->legacy.IO_ADDR_W); +} + +static int tmio_nand_dev_ready(struct nand_chip *chip) +{ + struct tmio_nand *tmio = mtd_to_tmio(nand_to_mtd(chip)); + + return !(tmio_ioread8(tmio->fcr + FCR_STATUS) & FCR_STATUS_BUSY); +} + +static irqreturn_t tmio_irq(int irq, void *__tmio) +{ + struct tmio_nand *tmio = __tmio; + + /* disable RDYREQ interrupt */ + tmio_iowrite8(0x00, tmio->fcr + FCR_IMR); + complete(&tmio->comp); + + return IRQ_HANDLED; +} + +/* + *The TMIO core has a RDYREQ interrupt on the posedge of #SMRB. + *This interrupt is normally disabled, but for long operations like + *erase and write, we enable it to wake us up. The irq handler + *disables the interrupt. + */ +static int tmio_nand_wait(struct nand_chip *nand_chip) +{ + struct tmio_nand *tmio = mtd_to_tmio(nand_to_mtd(nand_chip)); + long timeout; + u8 status; + + /* enable RDYREQ interrupt */ + + tmio_iowrite8(0x0f, tmio->fcr + FCR_ISR); + reinit_completion(&tmio->comp); + tmio_iowrite8(0x81, tmio->fcr + FCR_IMR); + + timeout = 400; + timeout = wait_for_completion_timeout(&tmio->comp, + msecs_to_jiffies(timeout)); + + if (unlikely(!tmio_nand_dev_ready(nand_chip))) { + tmio_iowrite8(0x00, tmio->fcr + FCR_IMR); + dev_warn(&tmio->dev->dev, "still busy after 400 ms\n"); + + } else if (unlikely(!timeout)) { + tmio_iowrite8(0x00, tmio->fcr + FCR_IMR); + dev_warn(&tmio->dev->dev, "timeout waiting for interrupt\n"); + } + + nand_status_op(nand_chip, &status); + return status; +} + +/* + *The TMIO controller combines two 8-bit data bytes into one 16-bit + *word. This function separates them so nand_base.c works as expected, + *especially its NAND_CMD_READID routines. + * + *To prevent stale data from being read, tmio_nand_hwcontrol() clears + *tmio->read_good. + */ +static u_char tmio_nand_read_byte(struct nand_chip *chip) +{ + struct tmio_nand *tmio = mtd_to_tmio(nand_to_mtd(chip)); + unsigned int data; + + if (tmio->read_good--) + return tmio->read; + + data = tmio_ioread16(tmio->fcr + FCR_DATA); + tmio->read = data >> 8; + return data; +} + +/* + *The TMIO controller converts an 8-bit NAND interface to a 16-bit + *bus interface, so all data reads and writes must be 16-bit wide. + *Thus, we implement 16-bit versions of the read, write, and verify + *buffer functions. + */ +static void +tmio_nand_write_buf(struct nand_chip *chip, const u_char *buf, int len) +{ + struct tmio_nand *tmio = mtd_to_tmio(nand_to_mtd(chip)); + + tmio_iowrite16_rep(tmio->fcr + FCR_DATA, buf, len >> 1); +} + +static void tmio_nand_read_buf(struct nand_chip *chip, u_char *buf, int len) +{ + struct tmio_nand *tmio = mtd_to_tmio(nand_to_mtd(chip)); + + tmio_ioread16_rep(tmio->fcr + FCR_DATA, buf, len >> 1); +} + +static void tmio_nand_enable_hwecc(struct nand_chip *chip, int mode) +{ + struct tmio_nand *tmio = mtd_to_tmio(nand_to_mtd(chip)); + + tmio_iowrite8(FCR_MODE_HWECC_RESET, tmio->fcr + FCR_MODE); + tmio_ioread8(tmio->fcr + FCR_DATA); /* dummy read */ + tmio_iowrite8(FCR_MODE_HWECC_CALC, tmio->fcr + FCR_MODE); +} + +static int tmio_nand_calculate_ecc(struct nand_chip *chip, const u_char *dat, + u_char *ecc_code) +{ + struct tmio_nand *tmio = mtd_to_tmio(nand_to_mtd(chip)); + unsigned int ecc; + + tmio_iowrite8(FCR_MODE_HWECC_RESULT, tmio->fcr + FCR_MODE); + + ecc = tmio_ioread16(tmio->fcr + FCR_DATA); + ecc_code[1] = ecc; /* 000-255 LP7-0 */ + ecc_code[0] = ecc >> 8; /* 000-255 LP15-8 */ + ecc = tmio_ioread16(tmio->fcr + FCR_DATA); + ecc_code[2] = ecc; /* 000-255 CP5-0,11b */ + ecc_code[4] = ecc >> 8; /* 256-511 LP7-0 */ + ecc = tmio_ioread16(tmio->fcr + FCR_DATA); + ecc_code[3] = ecc; /* 256-511 LP15-8 */ + ecc_code[5] = ecc >> 8; /* 256-511 CP5-0,11b */ + + tmio_iowrite8(FCR_MODE_DATA, tmio->fcr + FCR_MODE); + return 0; +} + +static int tmio_nand_correct_data(struct nand_chip *chip, unsigned char *buf, + unsigned char *read_ecc, + unsigned char *calc_ecc) +{ + int r0, r1; + + /* assume ecc.size = 512 and ecc.bytes = 6 */ + r0 = rawnand_sw_hamming_correct(chip, buf, read_ecc, calc_ecc); + if (r0 < 0) + return r0; + r1 = rawnand_sw_hamming_correct(chip, buf + 256, read_ecc + 3, + calc_ecc + 3); + if (r1 < 0) + return r1; + return r0 + r1; +} + +static int tmio_hw_init(struct platform_device *dev, struct tmio_nand *tmio) +{ + const struct mfd_cell *cell = mfd_get_cell(dev); + int ret; + + if (cell->enable) { + ret = cell->enable(dev); + if (ret) + return ret; + } + + /* (4Ch) CLKRUN Enable 1st spcrunc */ + tmio_iowrite8(0x81, tmio->ccr + CCR_ICC); + + /* (10h)BaseAddress 0x1000 spba.spba2 */ + tmio_iowrite16(tmio->fcr_base, tmio->ccr + CCR_BASE); + tmio_iowrite16(tmio->fcr_base >> 16, tmio->ccr + CCR_BASE + 2); + + /* (04h)Command Register I/O spcmd */ + tmio_iowrite8(0x02, tmio->ccr + CCR_COMMAND); + + /* (62h) Power Supply Control ssmpwc */ + /* HardPowerOFF - SuspendOFF - PowerSupplyWait_4MS */ + tmio_iowrite8(0x02, tmio->ccr + CCR_NFPSC); + + /* (63h) Detect Control ssmdtc */ + tmio_iowrite8(0x02, tmio->ccr + CCR_NFDC); + + /* Interrupt status register clear sintst */ + tmio_iowrite8(0x0f, tmio->fcr + FCR_ISR); + + /* After power supply, Media are reset smode */ + tmio_iowrite8(FCR_MODE_POWER_ON, tmio->fcr + FCR_MODE); + tmio_iowrite8(FCR_MODE_COMMAND, tmio->fcr + FCR_MODE); + tmio_iowrite8(NAND_CMD_RESET, tmio->fcr + FCR_DATA); + + /* Standby Mode smode */ + tmio_iowrite8(FCR_MODE_STANDBY, tmio->fcr + FCR_MODE); + + mdelay(5); + + return 0; +} + +static void tmio_hw_stop(struct platform_device *dev, struct tmio_nand *tmio) +{ + const struct mfd_cell *cell = mfd_get_cell(dev); + + tmio_iowrite8(FCR_MODE_POWER_OFF, tmio->fcr + FCR_MODE); + if (cell->disable) + cell->disable(dev); +} + +static int tmio_attach_chip(struct nand_chip *chip) +{ + if (chip->ecc.engine_type != NAND_ECC_ENGINE_TYPE_ON_HOST) + return 0; + + chip->ecc.size = 512; + chip->ecc.bytes = 6; + chip->ecc.strength = 2; + chip->ecc.hwctl = tmio_nand_enable_hwecc; + chip->ecc.calculate = tmio_nand_calculate_ecc; + chip->ecc.correct = tmio_nand_correct_data; + + return 0; +} + +static const struct nand_controller_ops tmio_ops = { + .attach_chip = tmio_attach_chip, +}; + +static int tmio_probe(struct platform_device *dev) +{ + struct tmio_nand_data *data = dev_get_platdata(&dev->dev); + struct resource *fcr = platform_get_resource(dev, + IORESOURCE_MEM, 0); + struct resource *ccr = platform_get_resource(dev, + IORESOURCE_MEM, 1); + int irq = platform_get_irq(dev, 0); + struct tmio_nand *tmio; + struct mtd_info *mtd; + struct nand_chip *nand_chip; + int retval; + + if (data == NULL) + dev_warn(&dev->dev, "NULL platform data!\n"); + + if (!ccr || !fcr) + return -EINVAL; + + tmio = devm_kzalloc(&dev->dev, sizeof(*tmio), GFP_KERNEL); + if (!tmio) + return -ENOMEM; + + init_completion(&tmio->comp); + + tmio->dev = dev; + + platform_set_drvdata(dev, tmio); + nand_chip = &tmio->chip; + mtd = nand_to_mtd(nand_chip); + mtd->name = "tmio-nand"; + mtd->dev.parent = &dev->dev; + + nand_controller_init(&tmio->controller); + tmio->controller.ops = &tmio_ops; + nand_chip->controller = &tmio->controller; + + tmio->ccr = devm_ioremap(&dev->dev, ccr->start, resource_size(ccr)); + if (!tmio->ccr) + return -EIO; + + tmio->fcr_base = fcr->start & 0xfffff; + tmio->fcr = devm_ioremap(&dev->dev, fcr->start, resource_size(fcr)); + if (!tmio->fcr) + return -EIO; + + retval = tmio_hw_init(dev, tmio); + if (retval) + return retval; + + /* Set address of NAND IO lines */ + nand_chip->legacy.IO_ADDR_R = tmio->fcr; + nand_chip->legacy.IO_ADDR_W = tmio->fcr; + + /* Set address of hardware control function */ + nand_chip->legacy.cmd_ctrl = tmio_nand_hwcontrol; + nand_chip->legacy.dev_ready = tmio_nand_dev_ready; + nand_chip->legacy.read_byte = tmio_nand_read_byte; + nand_chip->legacy.write_buf = tmio_nand_write_buf; + nand_chip->legacy.read_buf = tmio_nand_read_buf; + + if (data) + nand_chip->badblock_pattern = data->badblock_pattern; + + /* 15 us command delay time */ + nand_chip->legacy.chip_delay = 15; + + retval = devm_request_irq(&dev->dev, irq, &tmio_irq, 0, + dev_name(&dev->dev), tmio); + if (retval) { + dev_err(&dev->dev, "request_irq error %d\n", retval); + goto err_irq; + } + + tmio->irq = irq; + nand_chip->legacy.waitfunc = tmio_nand_wait; + + /* Scan to find existence of the device */ + retval = nand_scan(nand_chip, 1); + if (retval) + goto err_irq; + + /* Register the partitions */ + retval = mtd_device_parse_register(mtd, + data ? data->part_parsers : NULL, + NULL, + data ? data->partition : NULL, + data ? data->num_partitions : 0); + if (!retval) + return retval; + + nand_cleanup(nand_chip); + +err_irq: + tmio_hw_stop(dev, tmio); + return retval; +} + +static int tmio_remove(struct platform_device *dev) +{ + struct tmio_nand *tmio = platform_get_drvdata(dev); + struct nand_chip *chip = &tmio->chip; + int ret; + + ret = mtd_device_unregister(nand_to_mtd(chip)); + WARN_ON(ret); + nand_cleanup(chip); + tmio_hw_stop(dev, tmio); + return 0; +} + +#ifdef CONFIG_PM +static int tmio_suspend(struct platform_device *dev, pm_message_t state) +{ + const struct mfd_cell *cell = mfd_get_cell(dev); + + if (cell->suspend) + cell->suspend(dev); + + tmio_hw_stop(dev, platform_get_drvdata(dev)); + return 0; +} + +static int tmio_resume(struct platform_device *dev) +{ + const struct mfd_cell *cell = mfd_get_cell(dev); + + /* FIXME - is this required or merely another attack of the broken + * SHARP platform? Looks suspicious. + */ + tmio_hw_init(dev, platform_get_drvdata(dev)); + + if (cell->resume) + cell->resume(dev); + + return 0; +} +#else +#define tmio_suspend NULL +#define tmio_resume NULL +#endif + +static struct platform_driver tmio_driver = { + .driver.name = "tmio-nand", + .driver.owner = THIS_MODULE, + .probe = tmio_probe, + .remove = tmio_remove, + .suspend = tmio_suspend, + .resume = tmio_resume, +}; + +module_platform_driver(tmio_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Ian Molton, Dirk Opfer, Chris Humbert, Dmitry Baryshkov"); +MODULE_DESCRIPTION("NAND flash driver on Toshiba Mobile IO controller"); +MODULE_ALIAS("platform:tmio-nand"); |