| /* |
| * 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 drivers/mtd/nand/mxc_nand.c. Reworked and extended |
| * 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/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/nand.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 mtd_info mtd; |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = chip->priv; |
| |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = chip->priv; |
| |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = chip->priv; |
| |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = chip->priv; |
| 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->priv; |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = chip->priv; |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = nand->priv; |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = chip->priv; |
| |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = nand->priv; |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = chip->priv; |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = chip->priv; |
| 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->priv; |
| struct mpc5121_nfc_prv *prv = chip->priv; |
| |
| 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 *rootnode, *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; |
| struct mtd_part_parser_data ppdata; |
| |
| /* |
| * 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; |
| |
| mtd = &prv->mtd; |
| chip = &prv->chip; |
| |
| mtd->priv = chip; |
| chip->priv = prv; |
| 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"; |
| ppdata.of_node = dn; |
| 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->bbt_options = NAND_BBT_USE_FLASH; |
| chip->ecc.mode = NAND_ECC_SOFT; |
| |
| /* Support external chip-select logic on ADS5121 board */ |
| rootnode = of_find_node_by_path("/"); |
| if (of_device_is_compatible(rootnode, "fsl,mpc5121ads")) { |
| retval = ads5121_chipselect_init(mtd); |
| if (retval) { |
| dev_err(dev, "Chipselect init error!\n"); |
| of_node_put(rootnode); |
| return retval; |
| } |
| |
| chip->select_chip = ads5121_select_chip; |
| } |
| of_node_put(rootnode); |
| |
| /* Enable NFC clock */ |
| clk = devm_clk_get(dev, "nfc_clk"); |
| 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 */ |
| if (nand_scan(mtd, be32_to_cpup(chips_no))) { |
| dev_err(dev, "NAND Flash not found !\n"); |
| retval = -ENXIO; |
| 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_parse_register(mtd, NULL, &ppdata, 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 struct of_device_id mpc5121_nfc_match[] = { |
| { .compatible = "fsl,mpc5121-nfc", }, |
| {}, |
| }; |
| |
| static struct platform_driver mpc5121_nfc_driver = { |
| .probe = mpc5121_nfc_probe, |
| .remove = mpc5121_nfc_remove, |
| .driver = { |
| .name = DRV_NAME, |
| .owner = THIS_MODULE, |
| .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"); |