diff options
Diffstat (limited to 'drivers/mtd/nand/raw/mpc5121_nfc.c')
| -rw-r--r-- | drivers/mtd/nand/raw/mpc5121_nfc.c | 856 |
1 files changed, 856 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/mpc5121_nfc.c b/drivers/mtd/nand/raw/mpc5121_nfc.c new file mode 100644 index 0000000..6d1740d --- /dev/null +++ b/drivers/mtd/nand/raw/mpc5121_nfc.c @@ -0,0 +1,856 @@ +/* + * Copyright 2004-2008 Freescale Semiconductor, Inc. + * Copyright 2009 Semihalf. + * + * Approved as OSADL project by a majority of OSADL members and funded + * by OSADL membership fees in 2009; for details see www.osadl.org. + * + * Based on original driver from Freescale Semiconductor + * written by John Rigby <jrigby@freescale.com> on basis of mxc_nand.c. + * Reworked and extended by Piotr Ziecik <kosmo@semihalf.com>. + * + * 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. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301, USA. + */ + +#include <linux/module.h> +#include <linux/clk.h> +#include <linux/gfp.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/rawnand.h> +#include <linux/mtd/partitions.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> + +#include <asm/mpc5121.h> + +/* Addresses for NFC MAIN RAM BUFFER areas */ +#define NFC_MAIN_AREA(n) ((n) * 0x200) + +/* Addresses for NFC SPARE BUFFER areas */ +#define NFC_SPARE_BUFFERS 8 +#define NFC_SPARE_LEN 0x40 +#define NFC_SPARE_AREA(n) (0x1000 + ((n) * NFC_SPARE_LEN)) + +/* MPC5121 NFC registers */ +#define NFC_BUF_ADDR 0x1E04 +#define NFC_FLASH_ADDR 0x1E06 +#define NFC_FLASH_CMD 0x1E08 +#define NFC_CONFIG 0x1E0A +#define NFC_ECC_STATUS1 0x1E0C +#define NFC_ECC_STATUS2 0x1E0E +#define NFC_SPAS 0x1E10 +#define NFC_WRPROT 0x1E12 +#define NFC_NF_WRPRST 0x1E18 +#define NFC_CONFIG1 0x1E1A +#define NFC_CONFIG2 0x1E1C +#define NFC_UNLOCKSTART_BLK0 0x1E20 +#define NFC_UNLOCKEND_BLK0 0x1E22 +#define NFC_UNLOCKSTART_BLK1 0x1E24 +#define NFC_UNLOCKEND_BLK1 0x1E26 +#define NFC_UNLOCKSTART_BLK2 0x1E28 +#define NFC_UNLOCKEND_BLK2 0x1E2A +#define NFC_UNLOCKSTART_BLK3 0x1E2C +#define NFC_UNLOCKEND_BLK3 0x1E2E + +/* Bit Definitions: NFC_BUF_ADDR */ +#define NFC_RBA_MASK (7 << 0) +#define NFC_ACTIVE_CS_SHIFT 5 +#define NFC_ACTIVE_CS_MASK (3 << NFC_ACTIVE_CS_SHIFT) + +/* Bit Definitions: NFC_CONFIG */ +#define NFC_BLS_UNLOCKED (1 << 1) + +/* Bit Definitions: NFC_CONFIG1 */ +#define NFC_ECC_4BIT (1 << 0) +#define NFC_FULL_PAGE_DMA (1 << 1) +#define NFC_SPARE_ONLY (1 << 2) +#define NFC_ECC_ENABLE (1 << 3) +#define NFC_INT_MASK (1 << 4) +#define NFC_BIG_ENDIAN (1 << 5) +#define NFC_RESET (1 << 6) +#define NFC_CE (1 << 7) +#define NFC_ONE_CYCLE (1 << 8) +#define NFC_PPB_32 (0 << 9) +#define NFC_PPB_64 (1 << 9) +#define NFC_PPB_128 (2 << 9) +#define NFC_PPB_256 (3 << 9) +#define NFC_PPB_MASK (3 << 9) +#define NFC_FULL_PAGE_INT (1 << 11) + +/* Bit Definitions: NFC_CONFIG2 */ +#define NFC_COMMAND (1 << 0) +#define NFC_ADDRESS (1 << 1) +#define NFC_INPUT (1 << 2) +#define NFC_OUTPUT (1 << 3) +#define NFC_ID (1 << 4) +#define NFC_STATUS (1 << 5) +#define NFC_CMD_FAIL (1 << 15) +#define NFC_INT (1 << 15) + +/* Bit Definitions: NFC_WRPROT */ +#define NFC_WPC_LOCK_TIGHT (1 << 0) +#define NFC_WPC_LOCK (1 << 1) +#define NFC_WPC_UNLOCK (1 << 2) + +#define DRV_NAME "mpc5121_nfc" + +/* Timeouts */ +#define NFC_RESET_TIMEOUT 1000 /* 1 ms */ +#define NFC_TIMEOUT (HZ / 10) /* 1/10 s */ + +struct mpc5121_nfc_prv { + struct nand_chip chip; + int irq; + void __iomem *regs; + struct clk *clk; + wait_queue_head_t irq_waitq; + uint column; + int spareonly; + void __iomem *csreg; + struct device *dev; +}; + +static void mpc5121_nfc_done(struct mtd_info *mtd); + +/* Read NFC register */ +static inline u16 nfc_read(struct mtd_info *mtd, uint reg) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); + + return in_be16(prv->regs + reg); +} + +/* Write NFC register */ +static inline void nfc_write(struct mtd_info *mtd, uint reg, u16 val) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); + + out_be16(prv->regs + reg, val); +} + +/* Set bits in NFC register */ +static inline void nfc_set(struct mtd_info *mtd, uint reg, u16 bits) +{ + nfc_write(mtd, reg, nfc_read(mtd, reg) | bits); +} + +/* Clear bits in NFC register */ +static inline void nfc_clear(struct mtd_info *mtd, uint reg, u16 bits) +{ + nfc_write(mtd, reg, nfc_read(mtd, reg) & ~bits); +} + +/* Invoke address cycle */ +static inline void mpc5121_nfc_send_addr(struct mtd_info *mtd, u16 addr) +{ + nfc_write(mtd, NFC_FLASH_ADDR, addr); + nfc_write(mtd, NFC_CONFIG2, NFC_ADDRESS); + mpc5121_nfc_done(mtd); +} + +/* Invoke command cycle */ +static inline void mpc5121_nfc_send_cmd(struct mtd_info *mtd, u16 cmd) +{ + nfc_write(mtd, NFC_FLASH_CMD, cmd); + nfc_write(mtd, NFC_CONFIG2, NFC_COMMAND); + mpc5121_nfc_done(mtd); +} + +/* Send data from NFC buffers to NAND flash */ +static inline void mpc5121_nfc_send_prog_page(struct mtd_info *mtd) +{ + nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); + nfc_write(mtd, NFC_CONFIG2, NFC_INPUT); + mpc5121_nfc_done(mtd); +} + +/* Receive data from NAND flash */ +static inline void mpc5121_nfc_send_read_page(struct mtd_info *mtd) +{ + nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); + nfc_write(mtd, NFC_CONFIG2, NFC_OUTPUT); + mpc5121_nfc_done(mtd); +} + +/* Receive ID from NAND flash */ +static inline void mpc5121_nfc_send_read_id(struct mtd_info *mtd) +{ + nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); + nfc_write(mtd, NFC_CONFIG2, NFC_ID); + mpc5121_nfc_done(mtd); +} + +/* Receive status from NAND flash */ +static inline void mpc5121_nfc_send_read_status(struct mtd_info *mtd) +{ + nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); + nfc_write(mtd, NFC_CONFIG2, NFC_STATUS); + mpc5121_nfc_done(mtd); +} + +/* NFC interrupt handler */ +static irqreturn_t mpc5121_nfc_irq(int irq, void *data) +{ + struct mtd_info *mtd = data; + struct nand_chip *chip = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); + + nfc_set(mtd, NFC_CONFIG1, NFC_INT_MASK); + wake_up(&prv->irq_waitq); + + return IRQ_HANDLED; +} + +/* Wait for operation complete */ +static void mpc5121_nfc_done(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); + int rv; + + if ((nfc_read(mtd, NFC_CONFIG2) & NFC_INT) == 0) { + nfc_clear(mtd, NFC_CONFIG1, NFC_INT_MASK); + rv = wait_event_timeout(prv->irq_waitq, + (nfc_read(mtd, NFC_CONFIG2) & NFC_INT), NFC_TIMEOUT); + + if (!rv) + dev_warn(prv->dev, + "Timeout while waiting for interrupt.\n"); + } + + nfc_clear(mtd, NFC_CONFIG2, NFC_INT); +} + +/* Do address cycle(s) */ +static void mpc5121_nfc_addr_cycle(struct mtd_info *mtd, int column, int page) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + u32 pagemask = chip->pagemask; + + if (column != -1) { + mpc5121_nfc_send_addr(mtd, column); + if (mtd->writesize > 512) + mpc5121_nfc_send_addr(mtd, column >> 8); + } + + if (page != -1) { + do { + mpc5121_nfc_send_addr(mtd, page & 0xFF); + page >>= 8; + pagemask >>= 8; + } while (pagemask); + } +} + +/* Control chip select signals */ +static void mpc5121_nfc_select_chip(struct mtd_info *mtd, int chip) +{ + if (chip < 0) { + nfc_clear(mtd, NFC_CONFIG1, NFC_CE); + return; + } + + nfc_clear(mtd, NFC_BUF_ADDR, NFC_ACTIVE_CS_MASK); + nfc_set(mtd, NFC_BUF_ADDR, (chip << NFC_ACTIVE_CS_SHIFT) & + NFC_ACTIVE_CS_MASK); + nfc_set(mtd, NFC_CONFIG1, NFC_CE); +} + +/* Init external chip select logic on ADS5121 board */ +static int ads5121_chipselect_init(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); + struct device_node *dn; + + dn = of_find_compatible_node(NULL, NULL, "fsl,mpc5121ads-cpld"); + if (dn) { + prv->csreg = of_iomap(dn, 0); + of_node_put(dn); + if (!prv->csreg) + return -ENOMEM; + + /* CPLD Register 9 controls NAND /CE Lines */ + prv->csreg += 9; + return 0; + } + + return -EINVAL; +} + +/* Control chips select signal on ADS5121 board */ +static void ads5121_select_chip(struct mtd_info *mtd, int chip) +{ + struct nand_chip *nand = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(nand); + u8 v; + + v = in_8(prv->csreg); + v |= 0x0F; + + if (chip >= 0) { + mpc5121_nfc_select_chip(mtd, 0); + v &= ~(1 << chip); + } else + mpc5121_nfc_select_chip(mtd, -1); + + out_8(prv->csreg, v); +} + +/* Read NAND Ready/Busy signal */ +static int mpc5121_nfc_dev_ready(struct mtd_info *mtd) +{ + /* + * NFC handles ready/busy signal internally. Therefore, this function + * always returns status as ready. + */ + return 1; +} + +/* Write command to NAND flash */ +static void mpc5121_nfc_command(struct mtd_info *mtd, unsigned command, + int column, int page) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); + + prv->column = (column >= 0) ? column : 0; + prv->spareonly = 0; + + switch (command) { + case NAND_CMD_PAGEPROG: + mpc5121_nfc_send_prog_page(mtd); + break; + /* + * NFC does not support sub-page reads and writes, + * so emulate them using full page transfers. + */ + case NAND_CMD_READ0: + column = 0; + break; + + case NAND_CMD_READ1: + prv->column += 256; + command = NAND_CMD_READ0; + column = 0; + break; + + case NAND_CMD_READOOB: + prv->spareonly = 1; + command = NAND_CMD_READ0; + column = 0; + break; + + case NAND_CMD_SEQIN: + mpc5121_nfc_command(mtd, NAND_CMD_READ0, column, page); + column = 0; + break; + + case NAND_CMD_ERASE1: + case NAND_CMD_ERASE2: + case NAND_CMD_READID: + case NAND_CMD_STATUS: + break; + + default: + return; + } + + mpc5121_nfc_send_cmd(mtd, command); + mpc5121_nfc_addr_cycle(mtd, column, page); + + switch (command) { + case NAND_CMD_READ0: + if (mtd->writesize > 512) + mpc5121_nfc_send_cmd(mtd, NAND_CMD_READSTART); + mpc5121_nfc_send_read_page(mtd); + break; + + case NAND_CMD_READID: + mpc5121_nfc_send_read_id(mtd); + break; + + case NAND_CMD_STATUS: + mpc5121_nfc_send_read_status(mtd); + if (chip->options & NAND_BUSWIDTH_16) + prv->column = 1; + else + prv->column = 0; + break; + } +} + +/* Copy data from/to NFC spare buffers. */ +static void mpc5121_nfc_copy_spare(struct mtd_info *mtd, uint offset, + u8 *buffer, uint size, int wr) +{ + struct nand_chip *nand = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(nand); + uint o, s, sbsize, blksize; + + /* + * NAND spare area is available through NFC spare buffers. + * The NFC divides spare area into (page_size / 512) chunks. + * Each chunk is placed into separate spare memory area, using + * first (spare_size / num_of_chunks) bytes of the buffer. + * + * For NAND device in which the spare area is not divided fully + * by the number of chunks, number of used bytes in each spare + * buffer is rounded down to the nearest even number of bytes, + * and all remaining bytes are added to the last used spare area. + * + * For more information read section 26.6.10 of MPC5121e + * Microcontroller Reference Manual, Rev. 3. + */ + + /* Calculate number of valid bytes in each spare buffer */ + sbsize = (mtd->oobsize / (mtd->writesize / 512)) & ~1; + + while (size) { + /* Calculate spare buffer number */ + s = offset / sbsize; + if (s > NFC_SPARE_BUFFERS - 1) + s = NFC_SPARE_BUFFERS - 1; + + /* + * Calculate offset to requested data block in selected spare + * buffer and its size. + */ + o = offset - (s * sbsize); + blksize = min(sbsize - o, size); + + if (wr) + memcpy_toio(prv->regs + NFC_SPARE_AREA(s) + o, + buffer, blksize); + else + memcpy_fromio(buffer, + prv->regs + NFC_SPARE_AREA(s) + o, blksize); + + buffer += blksize; + offset += blksize; + size -= blksize; + }; +} + +/* Copy data from/to NFC main and spare buffers */ +static void mpc5121_nfc_buf_copy(struct mtd_info *mtd, u_char *buf, int len, + int wr) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); + uint c = prv->column; + uint l; + + /* Handle spare area access */ + if (prv->spareonly || c >= mtd->writesize) { + /* Calculate offset from beginning of spare area */ + if (c >= mtd->writesize) + c -= mtd->writesize; + + prv->column += len; + mpc5121_nfc_copy_spare(mtd, c, buf, len, wr); + return; + } + + /* + * Handle main area access - limit copy length to prevent + * crossing main/spare boundary. + */ + l = min((uint)len, mtd->writesize - c); + prv->column += l; + + if (wr) + memcpy_toio(prv->regs + NFC_MAIN_AREA(0) + c, buf, l); + else + memcpy_fromio(buf, prv->regs + NFC_MAIN_AREA(0) + c, l); + + /* Handle crossing main/spare boundary */ + if (l != len) { + buf += l; + len -= l; + mpc5121_nfc_buf_copy(mtd, buf, len, wr); + } +} + +/* Read data from NFC buffers */ +static void mpc5121_nfc_read_buf(struct mtd_info *mtd, u_char *buf, int len) +{ + mpc5121_nfc_buf_copy(mtd, buf, len, 0); +} + +/* Write data to NFC buffers */ +static void mpc5121_nfc_write_buf(struct mtd_info *mtd, + const u_char *buf, int len) +{ + mpc5121_nfc_buf_copy(mtd, (u_char *)buf, len, 1); +} + +/* Read byte from NFC buffers */ +static u8 mpc5121_nfc_read_byte(struct mtd_info *mtd) +{ + u8 tmp; + + mpc5121_nfc_read_buf(mtd, &tmp, sizeof(tmp)); + + return tmp; +} + +/* Read word from NFC buffers */ +static u16 mpc5121_nfc_read_word(struct mtd_info *mtd) +{ + u16 tmp; + + mpc5121_nfc_read_buf(mtd, (u_char *)&tmp, sizeof(tmp)); + + return tmp; +} + +/* + * Read NFC configuration from Reset Config Word + * + * NFC is configured during reset in basis of information stored + * in Reset Config Word. There is no other way to set NAND block + * size, spare size and bus width. + */ +static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); + struct mpc512x_reset_module *rm; + struct device_node *rmnode; + uint rcw_pagesize = 0; + uint rcw_sparesize = 0; + uint rcw_width; + uint rcwh; + uint romloc, ps; + int ret = 0; + + rmnode = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset"); + if (!rmnode) { + dev_err(prv->dev, "Missing 'fsl,mpc5121-reset' " + "node in device tree!\n"); + return -ENODEV; + } + + rm = of_iomap(rmnode, 0); + if (!rm) { + dev_err(prv->dev, "Error mapping reset module node!\n"); + ret = -EBUSY; + goto out; + } + + rcwh = in_be32(&rm->rcwhr); + + /* Bit 6: NFC bus width */ + rcw_width = ((rcwh >> 6) & 0x1) ? 2 : 1; + + /* Bit 7: NFC Page/Spare size */ + ps = (rcwh >> 7) & 0x1; + + /* Bits [22:21]: ROM Location */ + romloc = (rcwh >> 21) & 0x3; + + /* Decode RCW bits */ + switch ((ps << 2) | romloc) { + case 0x00: + case 0x01: + rcw_pagesize = 512; + rcw_sparesize = 16; + break; + case 0x02: + case 0x03: + rcw_pagesize = 4096; + rcw_sparesize = 128; + break; + case 0x04: + case 0x05: + rcw_pagesize = 2048; + rcw_sparesize = 64; + break; + case 0x06: + case 0x07: + rcw_pagesize = 4096; + rcw_sparesize = 218; + break; + } + + mtd->writesize = rcw_pagesize; + mtd->oobsize = rcw_sparesize; + if (rcw_width == 2) + chip->options |= NAND_BUSWIDTH_16; + + dev_notice(prv->dev, "Configured for " + "%u-bit NAND, page size %u " + "with %u spare.\n", + rcw_width * 8, rcw_pagesize, + rcw_sparesize); + iounmap(rm); +out: + of_node_put(rmnode); + return ret; +} + +/* Free driver resources */ +static void mpc5121_nfc_free(struct device *dev, struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip); + + if (prv->clk) + clk_disable_unprepare(prv->clk); + + if (prv->csreg) + iounmap(prv->csreg); +} + +static int mpc5121_nfc_probe(struct platform_device *op) +{ + struct device_node *dn = op->dev.of_node; + struct clk *clk; + struct device *dev = &op->dev; + struct mpc5121_nfc_prv *prv; + struct resource res; + struct mtd_info *mtd; + struct nand_chip *chip; + unsigned long regs_paddr, regs_size; + const __be32 *chips_no; + int resettime = 0; + int retval = 0; + int rev, len; + + /* + * Check SoC revision. This driver supports only NFC + * in MPC5121 revision 2 and MPC5123 revision 3. + */ + rev = (mfspr(SPRN_SVR) >> 4) & 0xF; + if ((rev != 2) && (rev != 3)) { + dev_err(dev, "SoC revision %u is not supported!\n", rev); + return -ENXIO; + } + + prv = devm_kzalloc(dev, sizeof(*prv), GFP_KERNEL); + if (!prv) + return -ENOMEM; + + chip = &prv->chip; + mtd = nand_to_mtd(chip); + + mtd->dev.parent = dev; + nand_set_controller_data(chip, prv); + nand_set_flash_node(chip, dn); + prv->dev = dev; + + /* Read NFC configuration from Reset Config Word */ + retval = mpc5121_nfc_read_hw_config(mtd); + if (retval) { + dev_err(dev, "Unable to read NFC config!\n"); + return retval; + } + + prv->irq = irq_of_parse_and_map(dn, 0); + if (prv->irq == NO_IRQ) { + dev_err(dev, "Error mapping IRQ!\n"); + return -EINVAL; + } + + retval = of_address_to_resource(dn, 0, &res); + if (retval) { + dev_err(dev, "Error parsing memory region!\n"); + return retval; + } + + chips_no = of_get_property(dn, "chips", &len); + if (!chips_no || len != sizeof(*chips_no)) { + dev_err(dev, "Invalid/missing 'chips' property!\n"); + return -EINVAL; + } + + regs_paddr = res.start; + regs_size = resource_size(&res); + + if (!devm_request_mem_region(dev, regs_paddr, regs_size, DRV_NAME)) { + dev_err(dev, "Error requesting memory region!\n"); + return -EBUSY; + } + + prv->regs = devm_ioremap(dev, regs_paddr, regs_size); + if (!prv->regs) { + dev_err(dev, "Error mapping memory region!\n"); + return -ENOMEM; + } + + mtd->name = "MPC5121 NAND"; + chip->dev_ready = mpc5121_nfc_dev_ready; + chip->cmdfunc = mpc5121_nfc_command; + chip->read_byte = mpc5121_nfc_read_byte; + chip->read_word = mpc5121_nfc_read_word; + chip->read_buf = mpc5121_nfc_read_buf; + chip->write_buf = mpc5121_nfc_write_buf; + chip->select_chip = mpc5121_nfc_select_chip; + chip->set_features = nand_get_set_features_notsupp; + chip->get_features = nand_get_set_features_notsupp; + chip->bbt_options = NAND_BBT_USE_FLASH; + chip->ecc.mode = NAND_ECC_SOFT; + chip->ecc.algo = NAND_ECC_HAMMING; + + /* Support external chip-select logic on ADS5121 board */ + if (of_machine_is_compatible("fsl,mpc5121ads")) { + retval = ads5121_chipselect_init(mtd); + if (retval) { + dev_err(dev, "Chipselect init error!\n"); + return retval; + } + + chip->select_chip = ads5121_select_chip; + } + + /* Enable NFC clock */ + clk = devm_clk_get(dev, "ipg"); + if (IS_ERR(clk)) { + dev_err(dev, "Unable to acquire NFC clock!\n"); + retval = PTR_ERR(clk); + goto error; + } + retval = clk_prepare_enable(clk); + if (retval) { + dev_err(dev, "Unable to enable NFC clock!\n"); + goto error; + } + prv->clk = clk; + + /* Reset NAND Flash controller */ + nfc_set(mtd, NFC_CONFIG1, NFC_RESET); + while (nfc_read(mtd, NFC_CONFIG1) & NFC_RESET) { + if (resettime++ >= NFC_RESET_TIMEOUT) { + dev_err(dev, "Timeout while resetting NFC!\n"); + retval = -EINVAL; + goto error; + } + + udelay(1); + } + + /* Enable write to NFC memory */ + nfc_write(mtd, NFC_CONFIG, NFC_BLS_UNLOCKED); + + /* Enable write to all NAND pages */ + nfc_write(mtd, NFC_UNLOCKSTART_BLK0, 0x0000); + nfc_write(mtd, NFC_UNLOCKEND_BLK0, 0xFFFF); + nfc_write(mtd, NFC_WRPROT, NFC_WPC_UNLOCK); + + /* + * Setup NFC: + * - Big Endian transfers, + * - Interrupt after full page read/write. + */ + nfc_write(mtd, NFC_CONFIG1, NFC_BIG_ENDIAN | NFC_INT_MASK | + NFC_FULL_PAGE_INT); + + /* Set spare area size */ + nfc_write(mtd, NFC_SPAS, mtd->oobsize >> 1); + + init_waitqueue_head(&prv->irq_waitq); + retval = devm_request_irq(dev, prv->irq, &mpc5121_nfc_irq, 0, DRV_NAME, + mtd); + if (retval) { + dev_err(dev, "Error requesting IRQ!\n"); + goto error; + } + + /* Detect NAND chips */ + retval = nand_scan(mtd, be32_to_cpup(chips_no)); + if (retval) { + dev_err(dev, "NAND Flash not found !\n"); + goto error; + } + + /* Set erase block size */ + switch (mtd->erasesize / mtd->writesize) { + case 32: + nfc_set(mtd, NFC_CONFIG1, NFC_PPB_32); + break; + + case 64: + nfc_set(mtd, NFC_CONFIG1, NFC_PPB_64); + break; + + case 128: + nfc_set(mtd, NFC_CONFIG1, NFC_PPB_128); + break; + + case 256: + nfc_set(mtd, NFC_CONFIG1, NFC_PPB_256); + break; + + default: + dev_err(dev, "Unsupported NAND flash!\n"); + retval = -ENXIO; + goto error; + } + + dev_set_drvdata(dev, mtd); + + /* Register device in MTD */ + retval = mtd_device_register(mtd, NULL, 0); + if (retval) { + dev_err(dev, "Error adding MTD device!\n"); + goto error; + } + + return 0; +error: + mpc5121_nfc_free(dev, mtd); + return retval; +} + +static int mpc5121_nfc_remove(struct platform_device *op) +{ + struct device *dev = &op->dev; + struct mtd_info *mtd = dev_get_drvdata(dev); + + nand_release(mtd); + mpc5121_nfc_free(dev, mtd); + + return 0; +} + +static const struct of_device_id mpc5121_nfc_match[] = { + { .compatible = "fsl,mpc5121-nfc", }, + {}, +}; +MODULE_DEVICE_TABLE(of, mpc5121_nfc_match); + +static struct platform_driver mpc5121_nfc_driver = { + .probe = mpc5121_nfc_probe, + .remove = mpc5121_nfc_remove, + .driver = { + .name = DRV_NAME, + .of_match_table = mpc5121_nfc_match, + }, +}; + +module_platform_driver(mpc5121_nfc_driver); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("MPC5121 NAND MTD driver"); +MODULE_LICENSE("GPL"); |
