diff options
Diffstat (limited to 'drivers/mtd/nand/pxa3xx_nand.c')
| -rw-r--r-- | drivers/mtd/nand/pxa3xx_nand.c | 1621 |
1 files changed, 1621 insertions, 0 deletions
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c new file mode 100644 index 0000000000..1565a9a060 --- /dev/null +++ b/drivers/mtd/nand/pxa3xx_nand.c @@ -0,0 +1,1621 @@ +/* + * drivers/mtd/nand/pxa3xx_nand.c + * + * Copyright © 2005 Intel Corporation + * Copyright © 2006 Marvell International Ltd. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <malloc.h> +#include <nand.h> +#include <asm/errno.h> +#include <asm/io.h> +#include <asm/arch/cpu.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/types.h> + +#include "pxa3xx_nand.h" + +/* Some U-Boot compatibility macros */ +#define writesl(a, d, s) __raw_writesl((unsigned long)a, d, s) +#define readsl(a, d, s) __raw_readsl((unsigned long)a, d, s) +#define writesw(a, d, s) __raw_writesw((unsigned long)a, d, s) +#define readsw(a, d, s) __raw_readsw((unsigned long)a, d, s) +#define writesb(a, d, s) __raw_writesb((unsigned long)a, d, s) +#define readsb(a, d, s) __raw_readsb((unsigned long)a, d, s) + +#define TIMEOUT_DRAIN_FIFO 5 /* in ms */ +#define CHIP_DELAY_TIMEOUT 200 +#define NAND_STOP_DELAY 40 +#define PAGE_CHUNK_SIZE (2048) + +/* + * Define a buffer size for the initial command that detects the flash device: + * STATUS, READID and PARAM. The largest of these is the PARAM command, + * needing 256 bytes. + */ +#define INIT_BUFFER_SIZE 256 + +/* registers and bit definitions */ +#define NDCR (0x00) /* Control register */ +#define NDTR0CS0 (0x04) /* Timing Parameter 0 for CS0 */ +#define NDTR1CS0 (0x0C) /* Timing Parameter 1 for CS0 */ +#define NDSR (0x14) /* Status Register */ +#define NDPCR (0x18) /* Page Count Register */ +#define NDBDR0 (0x1C) /* Bad Block Register 0 */ +#define NDBDR1 (0x20) /* Bad Block Register 1 */ +#define NDECCCTRL (0x28) /* ECC control */ +#define NDDB (0x40) /* Data Buffer */ +#define NDCB0 (0x48) /* Command Buffer0 */ +#define NDCB1 (0x4C) /* Command Buffer1 */ +#define NDCB2 (0x50) /* Command Buffer2 */ + +#define NDCR_SPARE_EN (0x1 << 31) +#define NDCR_ECC_EN (0x1 << 30) +#define NDCR_DMA_EN (0x1 << 29) +#define NDCR_ND_RUN (0x1 << 28) +#define NDCR_DWIDTH_C (0x1 << 27) +#define NDCR_DWIDTH_M (0x1 << 26) +#define NDCR_PAGE_SZ (0x1 << 24) +#define NDCR_NCSX (0x1 << 23) +#define NDCR_ND_MODE (0x3 << 21) +#define NDCR_NAND_MODE (0x0) +#define NDCR_CLR_PG_CNT (0x1 << 20) +#define NDCR_STOP_ON_UNCOR (0x1 << 19) +#define NDCR_RD_ID_CNT_MASK (0x7 << 16) +#define NDCR_RD_ID_CNT(x) (((x) << 16) & NDCR_RD_ID_CNT_MASK) + +#define NDCR_RA_START (0x1 << 15) +#define NDCR_PG_PER_BLK (0x1 << 14) +#define NDCR_ND_ARB_EN (0x1 << 12) +#define NDCR_INT_MASK (0xFFF) + +#define NDSR_MASK (0xfff) +#define NDSR_ERR_CNT_OFF (16) +#define NDSR_ERR_CNT_MASK (0x1f) +#define NDSR_ERR_CNT(sr) ((sr >> NDSR_ERR_CNT_OFF) & NDSR_ERR_CNT_MASK) +#define NDSR_RDY (0x1 << 12) +#define NDSR_FLASH_RDY (0x1 << 11) +#define NDSR_CS0_PAGED (0x1 << 10) +#define NDSR_CS1_PAGED (0x1 << 9) +#define NDSR_CS0_CMDD (0x1 << 8) +#define NDSR_CS1_CMDD (0x1 << 7) +#define NDSR_CS0_BBD (0x1 << 6) +#define NDSR_CS1_BBD (0x1 << 5) +#define NDSR_UNCORERR (0x1 << 4) +#define NDSR_CORERR (0x1 << 3) +#define NDSR_WRDREQ (0x1 << 2) +#define NDSR_RDDREQ (0x1 << 1) +#define NDSR_WRCMDREQ (0x1) + +#define NDCB0_LEN_OVRD (0x1 << 28) +#define NDCB0_ST_ROW_EN (0x1 << 26) +#define NDCB0_AUTO_RS (0x1 << 25) +#define NDCB0_CSEL (0x1 << 24) +#define NDCB0_EXT_CMD_TYPE_MASK (0x7 << 29) +#define NDCB0_EXT_CMD_TYPE(x) (((x) << 29) & NDCB0_EXT_CMD_TYPE_MASK) +#define NDCB0_CMD_TYPE_MASK (0x7 << 21) +#define NDCB0_CMD_TYPE(x) (((x) << 21) & NDCB0_CMD_TYPE_MASK) +#define NDCB0_NC (0x1 << 20) +#define NDCB0_DBC (0x1 << 19) +#define NDCB0_ADDR_CYC_MASK (0x7 << 16) +#define NDCB0_ADDR_CYC(x) (((x) << 16) & NDCB0_ADDR_CYC_MASK) +#define NDCB0_CMD2_MASK (0xff << 8) +#define NDCB0_CMD1_MASK (0xff) +#define NDCB0_ADDR_CYC_SHIFT (16) + +#define EXT_CMD_TYPE_DISPATCH 6 /* Command dispatch */ +#define EXT_CMD_TYPE_NAKED_RW 5 /* Naked read or Naked write */ +#define EXT_CMD_TYPE_READ 4 /* Read */ +#define EXT_CMD_TYPE_DISP_WR 4 /* Command dispatch with write */ +#define EXT_CMD_TYPE_FINAL 3 /* Final command */ +#define EXT_CMD_TYPE_LAST_RW 1 /* Last naked read/write */ +#define EXT_CMD_TYPE_MONO 0 /* Monolithic read/write */ + +/* macros for registers read/write */ +#define nand_writel(info, off, val) \ + writel((val), (info)->mmio_base + (off)) + +#define nand_readl(info, off) \ + readl((info)->mmio_base + (off)) + +/* error code and state */ +enum { + ERR_NONE = 0, + ERR_DMABUSERR = -1, + ERR_SENDCMD = -2, + ERR_UNCORERR = -3, + ERR_BBERR = -4, + ERR_CORERR = -5, +}; + +enum { + STATE_IDLE = 0, + STATE_PREPARED, + STATE_CMD_HANDLE, + STATE_DMA_READING, + STATE_DMA_WRITING, + STATE_DMA_DONE, + STATE_PIO_READING, + STATE_PIO_WRITING, + STATE_CMD_DONE, + STATE_READY, +}; + +enum pxa3xx_nand_variant { + PXA3XX_NAND_VARIANT_PXA, + PXA3XX_NAND_VARIANT_ARMADA370, +}; + +struct pxa3xx_nand_host { + struct nand_chip chip; + struct mtd_info *mtd; + void *info_data; + + /* page size of attached chip */ + int use_ecc; + int cs; + + /* calculated from pxa3xx_nand_flash data */ + unsigned int col_addr_cycles; + unsigned int row_addr_cycles; + size_t read_id_bytes; + +}; + +struct pxa3xx_nand_info { + struct nand_hw_control controller; + struct pxa3xx_nand_platform_data *pdata; + + struct clk *clk; + void __iomem *mmio_base; + unsigned long mmio_phys; + int cmd_complete, dev_ready; + + unsigned int buf_start; + unsigned int buf_count; + unsigned int buf_size; + unsigned int data_buff_pos; + unsigned int oob_buff_pos; + + unsigned char *data_buff; + unsigned char *oob_buff; + + struct pxa3xx_nand_host *host[NUM_CHIP_SELECT]; + unsigned int state; + + /* + * This driver supports NFCv1 (as found in PXA SoC) + * and NFCv2 (as found in Armada 370/XP SoC). + */ + enum pxa3xx_nand_variant variant; + + int cs; + int use_ecc; /* use HW ECC ? */ + int ecc_bch; /* using BCH ECC? */ + int use_spare; /* use spare ? */ + int need_wait; + + unsigned int data_size; /* data to be read from FIFO */ + unsigned int chunk_size; /* split commands chunk size */ + unsigned int oob_size; + unsigned int spare_size; + unsigned int ecc_size; + unsigned int ecc_err_cnt; + unsigned int max_bitflips; + int retcode; + + /* cached register value */ + uint32_t reg_ndcr; + uint32_t ndtr0cs0; + uint32_t ndtr1cs0; + + /* generated NDCBx register values */ + uint32_t ndcb0; + uint32_t ndcb1; + uint32_t ndcb2; + uint32_t ndcb3; +}; + +static struct pxa3xx_nand_timing timing[] = { + { 40, 80, 60, 100, 80, 100, 90000, 400, 40, }, + { 10, 0, 20, 40, 30, 40, 11123, 110, 10, }, + { 10, 25, 15, 25, 15, 30, 25000, 60, 10, }, + { 10, 35, 15, 25, 15, 25, 25000, 60, 10, }, +}; + +static struct pxa3xx_nand_flash builtin_flash_types[] = { + { 0x46ec, 16, 16, &timing[1] }, + { 0xdaec, 8, 8, &timing[1] }, + { 0xd7ec, 8, 8, &timing[1] }, + { 0xa12c, 8, 8, &timing[2] }, + { 0xb12c, 16, 16, &timing[2] }, + { 0xdc2c, 8, 8, &timing[2] }, + { 0xcc2c, 16, 16, &timing[2] }, + { 0xba20, 16, 16, &timing[3] }, +}; + +static u8 bbt_pattern[] = {'M', 'V', 'B', 'b', 't', '0' }; +static u8 bbt_mirror_pattern[] = {'1', 't', 'b', 'B', 'V', 'M' }; + +static struct nand_bbt_descr bbt_main_descr = { + .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE + | NAND_BBT_2BIT | NAND_BBT_VERSION, + .offs = 8, + .len = 6, + .veroffs = 14, + .maxblocks = 8, /* Last 8 blocks in each chip */ + .pattern = bbt_pattern +}; + +static struct nand_bbt_descr bbt_mirror_descr = { + .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE + | NAND_BBT_2BIT | NAND_BBT_VERSION, + .offs = 8, + .len = 6, + .veroffs = 14, + .maxblocks = 8, /* Last 8 blocks in each chip */ + .pattern = bbt_mirror_pattern +}; + +static struct nand_ecclayout ecc_layout_2KB_bch4bit = { + .eccbytes = 32, + .eccpos = { + 32, 33, 34, 35, 36, 37, 38, 39, + 40, 41, 42, 43, 44, 45, 46, 47, + 48, 49, 50, 51, 52, 53, 54, 55, + 56, 57, 58, 59, 60, 61, 62, 63}, + .oobfree = { {2, 30} } +}; + +static struct nand_ecclayout ecc_layout_4KB_bch4bit = { + .eccbytes = 64, + .eccpos = { + 32, 33, 34, 35, 36, 37, 38, 39, + 40, 41, 42, 43, 44, 45, 46, 47, + 48, 49, 50, 51, 52, 53, 54, 55, + 56, 57, 58, 59, 60, 61, 62, 63, + 96, 97, 98, 99, 100, 101, 102, 103, + 104, 105, 106, 107, 108, 109, 110, 111, + 112, 113, 114, 115, 116, 117, 118, 119, + 120, 121, 122, 123, 124, 125, 126, 127}, + /* Bootrom looks in bytes 0 & 5 for bad blocks */ + .oobfree = { {6, 26}, { 64, 32} } +}; + +static struct nand_ecclayout ecc_layout_4KB_bch8bit = { + .eccbytes = 128, + .eccpos = { + 32, 33, 34, 35, 36, 37, 38, 39, + 40, 41, 42, 43, 44, 45, 46, 47, + 48, 49, 50, 51, 52, 53, 54, 55, + 56, 57, 58, 59, 60, 61, 62, 63}, + .oobfree = { } +}; + +#define NDTR0_tCH(c) (min((c), 7) << 19) +#define NDTR0_tCS(c) (min((c), 7) << 16) +#define NDTR0_tWH(c) (min((c), 7) << 11) +#define NDTR0_tWP(c) (min((c), 7) << 8) +#define NDTR0_tRH(c) (min((c), 7) << 3) +#define NDTR0_tRP(c) (min((c), 7) << 0) + +#define NDTR1_tR(c) (min((c), 65535) << 16) +#define NDTR1_tWHR(c) (min((c), 15) << 4) +#define NDTR1_tAR(c) (min((c), 15) << 0) + +/* convert nano-seconds to nand flash controller clock cycles */ +#define ns2cycle(ns, clk) (int)((ns) * (clk / 1000000) / 1000) + +static enum pxa3xx_nand_variant pxa3xx_nand_get_variant(void) +{ + /* We only support the Armada 370/XP/38x for now */ + return PXA3XX_NAND_VARIANT_ARMADA370; +} + +static void pxa3xx_nand_set_timing(struct pxa3xx_nand_host *host, + const struct pxa3xx_nand_timing *t) +{ + struct pxa3xx_nand_info *info = host->info_data; + unsigned long nand_clk = mvebu_get_nand_clock(); + uint32_t ndtr0, ndtr1; + + ndtr0 = NDTR0_tCH(ns2cycle(t->tCH, nand_clk)) | + NDTR0_tCS(ns2cycle(t->tCS, nand_clk)) | + NDTR0_tWH(ns2cycle(t->tWH, nand_clk)) | + NDTR0_tWP(ns2cycle(t->tWP, nand_clk)) | + NDTR0_tRH(ns2cycle(t->tRH, nand_clk)) | + NDTR0_tRP(ns2cycle(t->tRP, nand_clk)); + + ndtr1 = NDTR1_tR(ns2cycle(t->tR, nand_clk)) | + NDTR1_tWHR(ns2cycle(t->tWHR, nand_clk)) | + NDTR1_tAR(ns2cycle(t->tAR, nand_clk)); + + info->ndtr0cs0 = ndtr0; + info->ndtr1cs0 = ndtr1; + nand_writel(info, NDTR0CS0, ndtr0); + nand_writel(info, NDTR1CS0, ndtr1); +} + +static void pxa3xx_nand_set_sdr_timing(struct pxa3xx_nand_host *host, + const struct nand_sdr_timings *t) +{ + struct pxa3xx_nand_info *info = host->info_data; + struct nand_chip *chip = &host->chip; + unsigned long nand_clk = mvebu_get_nand_clock(); + uint32_t ndtr0, ndtr1; + + u32 tCH_min = DIV_ROUND_UP(t->tCH_min, 1000); + u32 tCS_min = DIV_ROUND_UP(t->tCS_min, 1000); + u32 tWH_min = DIV_ROUND_UP(t->tWH_min, 1000); + u32 tWP_min = DIV_ROUND_UP(t->tWC_min - tWH_min, 1000); + u32 tREH_min = DIV_ROUND_UP(t->tREH_min, 1000); + u32 tRP_min = DIV_ROUND_UP(t->tRC_min - tREH_min, 1000); + u32 tR = chip->chip_delay * 1000; + u32 tWHR_min = DIV_ROUND_UP(t->tWHR_min, 1000); + u32 tAR_min = DIV_ROUND_UP(t->tAR_min, 1000); + + /* fallback to a default value if tR = 0 */ + if (!tR) + tR = 20000; + + ndtr0 = NDTR0_tCH(ns2cycle(tCH_min, nand_clk)) | + NDTR0_tCS(ns2cycle(tCS_min, nand_clk)) | + NDTR0_tWH(ns2cycle(tWH_min, nand_clk)) | + NDTR0_tWP(ns2cycle(tWP_min, nand_clk)) | + NDTR0_tRH(ns2cycle(tREH_min, nand_clk)) | + NDTR0_tRP(ns2cycle(tRP_min, nand_clk)); + + ndtr1 = NDTR1_tR(ns2cycle(tR, nand_clk)) | + NDTR1_tWHR(ns2cycle(tWHR_min, nand_clk)) | + NDTR1_tAR(ns2cycle(tAR_min, nand_clk)); + + info->ndtr0cs0 = ndtr0; + info->ndtr1cs0 = ndtr1; + nand_writel(info, NDTR0CS0, ndtr0); + nand_writel(info, NDTR1CS0, ndtr1); +} + +static int pxa3xx_nand_init_timings(struct pxa3xx_nand_host *host) +{ + const struct nand_sdr_timings *timings; + struct nand_chip *chip = &host->chip; + struct pxa3xx_nand_info *info = host->info_data; + const struct pxa3xx_nand_flash *f = NULL; + int mode, id, ntypes, i; + + mode = onfi_get_async_timing_mode(chip); + if (mode == ONFI_TIMING_MODE_UNKNOWN) { + ntypes = ARRAY_SIZE(builtin_flash_types); + + chip->cmdfunc(host->mtd, NAND_CMD_READID, 0x00, -1); + + id = chip->read_byte(host->mtd); + id |= chip->read_byte(host->mtd) << 0x8; + + for (i = 0; i < ntypes; i++) { + f = &builtin_flash_types[i]; + + if (f->chip_id == id) + break; + } + + if (i == ntypes) { + dev_err(&info->pdev->dev, "Error: timings not found\n"); + return -EINVAL; + } + + pxa3xx_nand_set_timing(host, f->timing); + + if (f->flash_width == 16) { + info->reg_ndcr |= NDCR_DWIDTH_M; + chip->options |= NAND_BUSWIDTH_16; + } + + info->reg_ndcr |= (f->dfc_width == 16) ? NDCR_DWIDTH_C : 0; + } else { + mode = fls(mode) - 1; + if (mode < 0) + mode = 0; + + timings = onfi_async_timing_mode_to_sdr_timings(mode); + if (IS_ERR(timings)) + return PTR_ERR(timings); + + pxa3xx_nand_set_sdr_timing(host, timings); + } + + return 0; +} + +/* + * Set the data and OOB size, depending on the selected + * spare and ECC configuration. + * Only applicable to READ0, READOOB and PAGEPROG commands. + */ +static void pxa3xx_set_datasize(struct pxa3xx_nand_info *info, + struct mtd_info *mtd) +{ + int oob_enable = info->reg_ndcr & NDCR_SPARE_EN; + + info->data_size = mtd->writesize; + if (!oob_enable) + return; + + info->oob_size = info->spare_size; + if (!info->use_ecc) + info->oob_size += info->ecc_size; +} + +/** + * NOTE: it is a must to set ND_RUN firstly, then write + * command buffer, otherwise, it does not work. + * We enable all the interrupt at the same time, and + * let pxa3xx_nand_irq to handle all logic. + */ +static void pxa3xx_nand_start(struct pxa3xx_nand_info *info) +{ + uint32_t ndcr; + + ndcr = info->reg_ndcr; + + if (info->use_ecc) { + ndcr |= NDCR_ECC_EN; + if (info->ecc_bch) + nand_writel(info, NDECCCTRL, 0x1); + } else { + ndcr &= ~NDCR_ECC_EN; + if (info->ecc_bch) + nand_writel(info, NDECCCTRL, 0x0); + } + + ndcr &= ~NDCR_DMA_EN; + + if (info->use_spare) + ndcr |= NDCR_SPARE_EN; + else + ndcr &= ~NDCR_SPARE_EN; + + ndcr |= NDCR_ND_RUN; + + /* clear status bits and run */ + nand_writel(info, NDCR, 0); + nand_writel(info, NDSR, NDSR_MASK); + nand_writel(info, NDCR, ndcr); +} + +static void disable_int(struct pxa3xx_nand_info *info, uint32_t int_mask) +{ + uint32_t ndcr; + + ndcr = nand_readl(info, NDCR); + nand_writel(info, NDCR, ndcr | int_mask); +} + +static void drain_fifo(struct pxa3xx_nand_info *info, void *data, int len) +{ + if (info->ecc_bch) { + u32 ts; + + /* + * According to the datasheet, when reading from NDDB + * with BCH enabled, after each 32 bytes reads, we + * have to make sure that the NDSR.RDDREQ bit is set. + * + * Drain the FIFO 8 32 bits reads at a time, and skip + * the polling on the last read. + */ + while (len > 8) { + readsl(info->mmio_base + NDDB, data, 8); + + ts = get_timer(0); + while (!(nand_readl(info, NDSR) & NDSR_RDDREQ)) { + if (get_timer(ts) > TIMEOUT_DRAIN_FIFO) { + dev_err(&info->pdev->dev, + "Timeout on RDDREQ while draining the FIFO\n"); + return; + } + } + + data += 32; + len -= 8; + } + } + + readsl(info->mmio_base + NDDB, data, len); +} + +static void handle_data_pio(struct pxa3xx_nand_info *info) +{ + unsigned int do_bytes = min(info->data_size, info->chunk_size); + + switch (info->state) { + case STATE_PIO_WRITING: + writesl(info->mmio_base + NDDB, + info->data_buff + info->data_buff_pos, + DIV_ROUND_UP(do_bytes, 4)); + + if (info->oob_size > 0) + writesl(info->mmio_base + NDDB, + info->oob_buff + info->oob_buff_pos, + DIV_ROUND_UP(info->oob_size, 4)); + break; + case STATE_PIO_READING: + drain_fifo(info, + info->data_buff + info->data_buff_pos, + DIV_ROUND_UP(do_bytes, 4)); + + if (info->oob_size > 0) + drain_fifo(info, + info->oob_buff + info->oob_buff_pos, + DIV_ROUND_UP(info->oob_size, 4)); + break; + default: + dev_err(&info->pdev->dev, "%s: invalid state %d\n", __func__, + info->state); + BUG(); + } + + /* Update buffer pointers for multi-page read/write */ + info->data_buff_pos += do_bytes; + info->oob_buff_pos += info->oob_size; + info->data_size -= do_bytes; +} + +static void pxa3xx_nand_irq_thread(struct pxa3xx_nand_info *info) +{ + handle_data_pio(info); + + info->state = STATE_CMD_DONE; + nand_writel(info, NDSR, NDSR_WRDREQ | NDSR_RDDREQ); +} + +static irqreturn_t pxa3xx_nand_irq(struct pxa3xx_nand_info *info) +{ + unsigned int status, is_completed = 0, is_ready = 0; + unsigned int ready, cmd_done; + irqreturn_t ret = IRQ_HANDLED; + + if (info->cs == 0) { + ready = NDSR_FLASH_RDY; + cmd_done = NDSR_CS0_CMDD; + } else { + ready = NDSR_RDY; + cmd_done = NDSR_CS1_CMDD; + } + + status = nand_readl(info, NDSR); + + if (status & NDSR_UNCORERR) + info->retcode = ERR_UNCORERR; + if (status & NDSR_CORERR) { + info->retcode = ERR_CORERR; + if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370 && + info->ecc_bch) + info->ecc_err_cnt = NDSR_ERR_CNT(status); + else + info->ecc_err_cnt = 1; + + /* + * Each chunk composing a page is corrected independently, + * and we need to store maximum number of corrected bitflips + * to return it to the MTD layer in ecc.read_page(). + */ + info->max_bitflips = max_t(unsigned int, + info->max_bitflips, + info->ecc_err_cnt); + } + if (status & (NDSR_RDDREQ | NDSR_WRDREQ)) { + info->state = (status & NDSR_RDDREQ) ? + STATE_PIO_READING : STATE_PIO_WRITING; + /* Call the IRQ thread in U-Boot directly */ + pxa3xx_nand_irq_thread(info); + return 0; + } + if (status & cmd_done) { + info->state = STATE_CMD_DONE; + is_completed = 1; + } + if (status & ready) { + info->state = STATE_READY; + is_ready = 1; + } + + if (status & NDSR_WRCMDREQ) { + nand_writel(info, NDSR, NDSR_WRCMDREQ); + status &= ~NDSR_WRCMDREQ; + info->state = STATE_CMD_HANDLE; + + /* + * Command buffer registers NDCB{0-2} (and optionally NDCB3) + * must be loaded by writing directly either 12 or 16 + * bytes directly to NDCB0, four bytes at a time. + * + * Direct write access to NDCB1, NDCB2 and NDCB3 is ignored + * but each NDCBx register can be read. + */ + nand_writel(info, NDCB0, info->ndcb0); + nand_writel(info, NDCB0, info->ndcb1); + nand_writel(info, NDCB0, info->ndcb2); + + /* NDCB3 register is available in NFCv2 (Armada 370/XP SoC) */ + if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370) + nand_writel(info, NDCB0, info->ndcb3); + } + + /* clear NDSR to let the controller exit the IRQ */ + nand_writel(info, NDSR, status); + if (is_completed) + info->cmd_complete = 1; + if (is_ready) + info->dev_ready = 1; + + return ret; +} + +static inline int is_buf_blank(uint8_t *buf, size_t len) +{ + for (; len > 0; len--) + if (*buf++ != 0xff) + return 0; + return 1; +} + +static void set_command_address(struct pxa3xx_nand_info *info, + unsigned int page_size, uint16_t column, int page_addr) +{ + /* small page addr setting */ + if (page_size < PAGE_CHUNK_SIZE) { + info->ndcb1 = ((page_addr & 0xFFFFFF) << 8) + | (column & 0xFF); + + info->ndcb2 = 0; + } else { + info->ndcb1 = ((page_addr & 0xFFFF) << 16) + | (column & 0xFFFF); + + if (page_addr & 0xFF0000) + info->ndcb2 = (page_addr & 0xFF0000) >> 16; + else + info->ndcb2 = 0; + } +} + +static void prepare_start_command(struct pxa3xx_nand_info *info, int command) +{ + struct pxa3xx_nand_host *host = info->host[info->cs]; + struct mtd_info *mtd = host->mtd; + + /* reset data and oob column point to handle data */ + info->buf_start = 0; + info->buf_count = 0; + info->oob_size = 0; + info->data_buff_pos = 0; + info->oob_buff_pos = 0; + info->use_ecc = 0; + info->use_spare = 1; + info->retcode = ERR_NONE; + info->ecc_err_cnt = 0; + info->ndcb3 = 0; + info->need_wait = 0; + + switch (command) { + case NAND_CMD_READ0: + case NAND_CMD_PAGEPROG: + info->use_ecc = 1; + case NAND_CMD_READOOB: + pxa3xx_set_datasize(info, mtd); + break; + case NAND_CMD_PARAM: + info->use_spare = 0; + break; + default: + info->ndcb1 = 0; + info->ndcb2 = 0; + break; + } + + /* + * If we are about to issue a read command, or about to set + * the write address, then clean the data buffer. + */ + if (command == NAND_CMD_READ0 || + command == NAND_CMD_READOOB || + command == NAND_CMD_SEQIN) { + info->buf_count = mtd->writesize + mtd->oobsize; + memset(info->data_buff, 0xFF, info->buf_count); + } +} + +static int prepare_set_command(struct pxa3xx_nand_info *info, int command, + int ext_cmd_type, uint16_t column, int page_addr) +{ + int addr_cycle, exec_cmd; + struct pxa3xx_nand_host *host; + struct mtd_info *mtd; + + host = info->host[info->cs]; + mtd = host->mtd; + addr_cycle = 0; + exec_cmd = 1; + + if (info->cs != 0) + info->ndcb0 = NDCB0_CSEL; + else + info->ndcb0 = 0; + + if (command == NAND_CMD_SEQIN) + exec_cmd = 0; + + addr_cycle = NDCB0_ADDR_CYC(host->row_addr_cycles + + host->col_addr_cycles); + + switch (command) { + case NAND_CMD_READOOB: + case NAND_CMD_READ0: + info->buf_start = column; + info->ndcb0 |= NDCB0_CMD_TYPE(0) + | addr_cycle + | NAND_CMD_READ0; + + if (command == NAND_CMD_READOOB) + info->buf_start += mtd->writesize; + + /* + * Multiple page read needs an 'extended command type' field, + * which is either naked-read or last-read according to the + * state. + */ + if (mtd->writesize == PAGE_CHUNK_SIZE) { + info->ndcb0 |= NDCB0_DBC | (NAND_CMD_READSTART << 8); + } else if (mtd->writesize > PAGE_CHUNK_SIZE) { + info->ndcb0 |= NDCB0_DBC | (NAND_CMD_READSTART << 8) + | NDCB0_LEN_OVRD + | NDCB0_EXT_CMD_TYPE(ext_cmd_type); + info->ndcb3 = info->chunk_size + + info->oob_size; + } + + set_command_address(info, mtd->writesize, column, page_addr); + break; + + case NAND_CMD_SEQIN: + + info->buf_start = column; + set_command_address(info, mtd->writesize, 0, page_addr); + + /* + * Multiple page programming needs to execute the initial + * SEQIN command that sets the page address. + */ + if (mtd->writesize > PAGE_CHUNK_SIZE) { + info->ndcb0 |= NDCB0_CMD_TYPE(0x1) + | NDCB0_EXT_CMD_TYPE(ext_cmd_type) + | addr_cycle + | command; + /* No data transfer in this case */ + info->data_size = 0; + exec_cmd = 1; + } + break; + + case NAND_CMD_PAGEPROG: + if (is_buf_blank(info->data_buff, + (mtd->writesize + mtd->oobsize))) { + exec_cmd = 0; + break; + } + + /* Second command setting for large pages */ + if (mtd->writesize > PAGE_CHUNK_SIZE) { + /* + * Multiple page write uses the 'extended command' + * field. This can be used to issue a command dispatch + * or a naked-write depending on the current stage. + */ + info->ndcb0 |= NDCB0_CMD_TYPE(0x1) + | NDCB0_LEN_OVRD + | NDCB0_EXT_CMD_TYPE(ext_cmd_type); + info->ndcb3 = info->chunk_size + + info->oob_size; + + /* + * This is the command dispatch that completes a chunked + * page program operation. + */ + if (info->data_size == 0) { + info->ndcb0 = NDCB0_CMD_TYPE(0x1) + | NDCB0_EXT_CMD_TYPE(ext_cmd_type) + | command; + info->ndcb1 = 0; + info->ndcb2 = 0; + info->ndcb3 = 0; + } + } else { + info->ndcb0 |= NDCB0_CMD_TYPE(0x1) + | NDCB0_AUTO_RS + | NDCB0_ST_ROW_EN + | NDCB0_DBC + | (NAND_CMD_PAGEPROG << 8) + | NAND_CMD_SEQIN + | addr_cycle; + } + break; + + case NAND_CMD_PARAM: + info->buf_count = 256; + info->ndcb0 |= NDCB0_CMD_TYPE(0) + | NDCB0_ADDR_CYC(1) + | NDCB0_LEN_OVRD + | command; + info->ndcb1 = (column & 0xFF); + info->ndcb3 = 256; + info->data_size = 256; + break; + + case NAND_CMD_READID: + info->buf_count = host->read_id_bytes; + info->ndcb0 |= NDCB0_CMD_TYPE(3) + | NDCB0_ADDR_CYC(1) + | command; + info->ndcb1 = (column & 0xFF); + + info->data_size = 8; + break; + case NAND_CMD_STATUS: + info->buf_count = 1; + info->ndcb0 |= NDCB0_CMD_TYPE(4) + | NDCB0_ADDR_CYC(1) + | command; + + info->data_size = 8; + break; + + case NAND_CMD_ERASE1: + info->ndcb0 |= NDCB0_CMD_TYPE(2) + | NDCB0_AUTO_RS + | NDCB0_ADDR_CYC(3) + | NDCB0_DBC + | (NAND_CMD_ERASE2 << 8) + | NAND_CMD_ERASE1; + info->ndcb1 = page_addr; + info->ndcb2 = 0; + + break; + case NAND_CMD_RESET: + info->ndcb0 |= NDCB0_CMD_TYPE(5) + | command; + + break; + + case NAND_CMD_ERASE2: + exec_cmd = 0; + break; + + default: + exec_cmd = 0; + dev_err(&info->pdev->dev, "non-supported command %x\n", + command); + break; + } + + return exec_cmd; +} + +static void nand_cmdfunc(struct mtd_info *mtd, unsigned command, + int column, int page_addr) +{ + struct pxa3xx_nand_host *host = mtd->priv; + struct pxa3xx_nand_info *info = host->info_data; + int exec_cmd; + + /* + * if this is a x16 device ,then convert the input + * "byte" address into a "word" address appropriate + * for indexing a word-oriented device + */ + if (info->reg_ndcr & NDCR_DWIDTH_M) + column /= 2; + + /* + * There may be different NAND chip hooked to + * different chip select, so check whether + * chip select has been changed, if yes, reset the timing + */ + if (info->cs != host->cs) { + info->cs = host->cs; + nand_writel(info, NDTR0CS0, info->ndtr0cs0); + nand_writel(info, NDTR1CS0, info->ndtr1cs0); + } + + prepare_start_command(info, command); + + info->state = STATE_PREPARED; + exec_cmd = prepare_set_command(info, command, 0, column, page_addr); + + if (exec_cmd) { + u32 ts; + + info->cmd_complete = 0; + info->dev_ready = 0; + info->need_wait = 1; + pxa3xx_nand_start(info); + + ts = get_timer(0); + while (1) { + u32 status; + + status = nand_readl(info, NDSR); + if (status) + pxa3xx_nand_irq(info); + + if (info->cmd_complete) + break; + + if (get_timer(ts) > CHIP_DELAY_TIMEOUT) { + dev_err(&info->pdev->dev, "Wait timeout!!!\n"); + return; + } + } + } + info->state = STATE_IDLE; +} + +static void nand_cmdfunc_extended(struct mtd_info *mtd, + const unsigned command, + int column, int page_addr) +{ + struct pxa3xx_nand_host *host = mtd->priv; + struct pxa3xx_nand_info *info = host->info_data; + int exec_cmd, ext_cmd_type; + + /* + * if this is a x16 device then convert the input + * "byte" address into a "word" address appropriate + * for indexing a word-oriented device + */ + if (info->reg_ndcr & NDCR_DWIDTH_M) + column /= 2; + + /* + * There may be different NAND chip hooked to + * different chip select, so check whether + * chip select has been changed, if yes, reset the timing + */ + if (info->cs != host->cs) { + info->cs = host->cs; + nand_writel(info, NDTR0CS0, info->ndtr0cs0); + nand_writel(info, NDTR1CS0, info->ndtr1cs0); + } + + /* Select the extended command for the first command */ + switch (command) { + case NAND_CMD_READ0: + case NAND_CMD_READOOB: + ext_cmd_type = EXT_CMD_TYPE_MONO; + break; + case NAND_CMD_SEQIN: + ext_cmd_type = EXT_CMD_TYPE_DISPATCH; + break; + case NAND_CMD_PAGEPROG: + ext_cmd_type = EXT_CMD_TYPE_NAKED_RW; + break; + default: + ext_cmd_type = 0; + break; + } + + prepare_start_command(info, command); + + /* + * Prepare the "is ready" completion before starting a command + * transaction sequence. If the command is not executed the + * completion will be completed, see below. + * + * We can do that inside the loop because the command variable + * is invariant and thus so is the exec_cmd. + */ + info->need_wait = 1; + info->dev_ready = 0; + + do { + u32 ts; + + info->state = STATE_PREPARED; + exec_cmd = prepare_set_command(info, command, ext_cmd_type, + column, page_addr); + if (!exec_cmd) { + info->need_wait = 0; + info->dev_ready = 1; + break; + } + + info->cmd_complete = 0; + pxa3xx_nand_start(info); + + ts = get_timer(0); + while (1) { + u32 status; + + status = nand_readl(info, NDSR); + if (status) + pxa3xx_nand_irq(info); + + if (info->cmd_complete) + break; + + if (get_timer(ts) > CHIP_DELAY_TIMEOUT) { + dev_err(&info->pdev->dev, "Wait timeout!!!\n"); + return; + } + } + + /* Check if the sequence is complete */ + if (info->data_size == 0 && command != NAND_CMD_PAGEPROG) + break; + + /* + * After a splitted program command sequence has issued + * the command dispatch, the command sequence is complete. + */ + if (info->data_size == 0 && + command == NAND_CMD_PAGEPROG && + ext_cmd_type == EXT_CMD_TYPE_DISPATCH) + break; + + if (command == NAND_CMD_READ0 || command == NAND_CMD_READOOB) { + /* Last read: issue a 'last naked read' */ + if (info->data_size == info->chunk_size) + ext_cmd_type = EXT_CMD_TYPE_LAST_RW; + else + ext_cmd_type = EXT_CMD_TYPE_NAKED_RW; + + /* + * If a splitted program command has no more data to transfer, + * the command dispatch must be issued to complete. + */ + } else if (command == NAND_CMD_PAGEPROG && + info->data_size == 0) { + ext_cmd_type = EXT_CMD_TYPE_DISPATCH; + } + } while (1); + + info->state = STATE_IDLE; +} + +static int pxa3xx_nand_write_page_hwecc(struct mtd_info *mtd, + struct nand_chip *chip, const uint8_t *buf, int oob_required) +{ + chip->write_buf(mtd, buf, mtd->writesize); + chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); + + return 0; +} + +static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd, + struct nand_chip *chip, uint8_t *buf, int oob_required, + int page) +{ + struct pxa3xx_nand_host *host = mtd->priv; + struct pxa3xx_nand_info *info = host->info_data; + + chip->read_buf(mtd, buf, mtd->writesize); + chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); + + if (info->retcode == ERR_CORERR && info->use_ecc) { + mtd->ecc_stats.corrected += info->ecc_err_cnt; + + } else if (info->retcode == ERR_UNCORERR) { + /* + * for blank page (all 0xff), HW will calculate its ECC as + * 0, which is different from the ECC information within + * OOB, ignore such uncorrectable errors + */ + if (is_buf_blank(buf, mtd->writesize)) + info->retcode = ERR_NONE; + else + mtd->ecc_stats.failed++; + } + + return info->max_bitflips; +} + +static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd) +{ + struct pxa3xx_nand_host *host = mtd->priv; + struct pxa3xx_nand_info *info = host->info_data; + char retval = 0xFF; + + if (info->buf_start < info->buf_count) + /* Has just send a new command? */ + retval = info->data_buff[info->buf_start++]; + + return retval; +} + +static u16 pxa3xx_nand_read_word(struct mtd_info *mtd) +{ + struct pxa3xx_nand_host *host = mtd->priv; + struct pxa3xx_nand_info *info = host->info_data; + u16 retval = 0xFFFF; + + if (!(info->buf_start & 0x01) && info->buf_start < info->buf_count) { + retval = *((u16 *)(info->data_buff+info->buf_start)); + info->buf_start += 2; + } + return retval; +} + +static void pxa3xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) +{ + struct pxa3xx_nand_host *host = mtd->priv; + struct pxa3xx_nand_info *info = host->info_data; + int real_len = min_t(size_t, len, info->buf_count - info->buf_start); + + memcpy(buf, info->data_buff + info->buf_start, real_len); + info->buf_start += real_len; +} + +static void pxa3xx_nand_write_buf(struct mtd_info *mtd, + const uint8_t *buf, int len) +{ + struct pxa3xx_nand_host *host = mtd->priv; + struct pxa3xx_nand_info *info = host->info_data; + int real_len = min_t(size_t, len, info->buf_count - info->buf_start); + + memcpy(info->data_buff + info->buf_start, buf, real_len); + info->buf_start += real_len; +} + +static void pxa3xx_nand_select_chip(struct mtd_info *mtd, int chip) +{ + return; +} + +static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this) +{ + struct pxa3xx_nand_host *host = mtd->priv; + struct pxa3xx_nand_info *info = host->info_data; + + if (info->need_wait) { + u32 ts; + + info->need_wait = 0; + + ts = get_timer(0); + while (1) { + u32 status; + + status = nand_readl(info, NDSR); + if (status) + pxa3xx_nand_irq(info); + + if (info->dev_ready) + break; + + if (get_timer(ts) > CHIP_DELAY_TIMEOUT) { + dev_err(&info->pdev->dev, "Ready timeout!!!\n"); + return NAND_STATUS_FAIL; + } + } + } + + /* pxa3xx_nand_send_command has waited for command complete */ + if (this->state == FL_WRITING || this->state == FL_ERASING) { + if (info->retcode == ERR_NONE) + return 0; + else + return NAND_STATUS_FAIL; + } + + return NAND_STATUS_READY; +} + +static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info) +{ + struct pxa3xx_nand_host *host = info->host[info->cs]; + struct mtd_info *mtd = host->mtd; + struct nand_chip *chip = mtd->priv; + + info->reg_ndcr |= (host->col_addr_cycles == 2) ? NDCR_RA_START : 0; + info->reg_ndcr |= (chip->page_shift == 6) ? NDCR_PG_PER_BLK : 0; + info->reg_ndcr |= (mtd->writesize == 2048) ? NDCR_PAGE_SZ : 0; + + return 0; +} + +static int pxa3xx_nand_detect_config(struct pxa3xx_nand_info *info) +{ + /* + * We set 0 by hard coding here, for we don't support keep_config + * when there is more than one chip attached to the controller + */ + struct pxa3xx_nand_host *host = info->host[0]; + uint32_t ndcr = nand_readl(info, NDCR); + + if (ndcr & NDCR_PAGE_SZ) { + /* Controller's FIFO size */ + info->chunk_size = 2048; + host->read_id_bytes = 4; + } else { + info->chunk_size = 512; + host->read_id_bytes = 2; + } + + /* Set an initial chunk size */ + info->reg_ndcr = ndcr & ~NDCR_INT_MASK; + info->ndtr0cs0 = nand_readl(info, NDTR0CS0); + info->ndtr1cs0 = nand_readl(info, NDTR1CS0); + return 0; +} + +static int pxa3xx_nand_init_buff(struct pxa3xx_nand_info *info) +{ + info->data_buff = kmalloc(info->buf_size, GFP_KERNEL); + if (info->data_buff == NULL) + return -ENOMEM; + return 0; +} + +static int pxa3xx_nand_sensing(struct pxa3xx_nand_host *host) +{ + struct pxa3xx_nand_info *info = host->info_data; + struct pxa3xx_nand_platform_data *pdata = info->pdata; + struct mtd_info *mtd; + struct nand_chip *chip; + const struct nand_sdr_timings *timings; + int ret; + + mtd = info->host[info->cs]->mtd; + chip = mtd->priv; + + /* configure default flash values */ + info->reg_ndcr = 0x0; /* enable all interrupts */ + info->reg_ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0; + info->reg_ndcr |= NDCR_RD_ID_CNT(host->read_id_bytes); + info->reg_ndcr |= NDCR_SPARE_EN; /* enable spare by default */ + + /* use the common timing to make a try */ + timings = onfi_async_timing_mode_to_sdr_timings(0); + if (IS_ERR(timings)) + return PTR_ERR(timings); + + pxa3xx_nand_set_sdr_timing(host, timings); + + chip->cmdfunc(mtd, NAND_CMD_RESET, 0, 0); + ret = chip->waitfunc(mtd, chip); + if (ret & NAND_STATUS_FAIL) + return -ENODEV; + + return 0; +} + +static int pxa_ecc_init(struct pxa3xx_nand_info *info, + struct nand_ecc_ctrl *ecc, + int strength, int ecc_stepsize, int page_size) +{ + if (strength == 1 && ecc_stepsize == 512 && page_size == 2048) { + info->chunk_size = 2048; + info->spare_size = 40; + info->ecc_size = 24; + ecc->mode = NAND_ECC_HW; + ecc->size = 512; + ecc->strength = 1; + + } else if (strength == 1 && ecc_stepsize == 512 && page_size == 512) { + info->chunk_size = 512; + info->spare_size = 8; + info->ecc_size = 8; + ecc->mode = NAND_ECC_HW; + ecc->size = 512; + ecc->strength = 1; + + /* + * Required ECC: 4-bit correction per 512 bytes + * Select: 16-bit correction per 2048 bytes + */ + } else if (strength == 4 && ecc_stepsize == 512 && page_size == 2048) { + info->ecc_bch = 1; + info->chunk_size = 2048; + info->spare_size = 32; + info->ecc_size = 32; + ecc->mode = NAND_ECC_HW; + ecc->size = info->chunk_size; + ecc->layout = &ecc_layout_2KB_bch4bit; + ecc->strength = 16; + + } else if (strength == 4 && ecc_stepsize == 512 && page_size == 4096) { + info->ecc_bch = 1; + info->chunk_size = 2048; + info->spare_size = 32; + info->ecc_size = 32; + ecc->mode = NAND_ECC_HW; + ecc->size = info->chunk_size; + ecc->layout = &ecc_layout_4KB_bch4bit; + ecc->strength = 16; + + /* + * Required ECC: 8-bit correction per 512 bytes + * Select: 16-bit correction per 1024 bytes + */ + } else if (strength == 8 && ecc_stepsize == 512 && page_size == 4096) { + info->ecc_bch = 1; + info->chunk_size = 1024; + info->spare_size = 0; + info->ecc_size = 32; + ecc->mode = NAND_ECC_HW; + ecc->size = info->chunk_size; + ecc->layout = &ecc_layout_4KB_bch8bit; + ecc->strength = 16; + } else { + dev_err(&info->pdev->dev, + "ECC strength %d at page size %d is not supported\n", + strength, page_size); + return -ENODEV; + } + + return 0; +} + +static int pxa3xx_nand_scan(struct mtd_info *mtd) +{ + struct pxa3xx_nand_host *host = mtd->priv; + struct pxa3xx_nand_info *info = host->info_data; + struct pxa3xx_nand_platform_data *pdata = info->pdata; + struct nand_chip *chip = mtd->priv; + int ret; + uint16_t ecc_strength, ecc_step; + + if (pdata->keep_config && !pxa3xx_nand_detect_config(info)) + goto KEEP_CONFIG; + + /* Set a default chunk size */ + info->chunk_size = 512; + + ret = pxa3xx_nand_sensing(host); + if (ret) { + dev_info(&info->pdev->dev, "There is no chip on cs %d!\n", + info->cs); + + return ret; + } + +KEEP_CONFIG: + /* Device detection must be done with ECC disabled */ + if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370) + nand_writel(info, NDECCCTRL, 0x0); + + if (nand_scan_ident(mtd, 1, NULL)) + return -ENODEV; + + if (!pdata->keep_config) { + ret = pxa3xx_nand_init_timings(host); + if (ret) { + dev_err(&info->pdev->dev, + "Failed to set timings: %d\n", ret); + return ret; + } + } + + ret = pxa3xx_nand_config_flash(info); + if (ret) + return ret; + +#ifdef CONFIG_SYS_NAND_USE_FLASH_BBT + /* + * We'll use a bad block table stored in-flash and don't + * allow writing the bad block marker to the flash. + */ + chip->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB_BBM; + chip->bbt_td = &bbt_main_descr; + chip->bbt_md = &bbt_mirror_descr; +#endif + + /* + * If the page size is bigger than the FIFO size, let's check + * we are given the right variant and then switch to the extended + * (aka splitted) command handling, + */ + if (mtd->writesize > PAGE_CHUNK_SIZE) { + if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370) { + chip->cmdfunc = nand_cmdfunc_extended; + } else { + dev_err(&info->pdev->dev, + "unsupported page size on this variant\n"); + return -ENODEV; + } + } + + if (pdata->ecc_strength && pdata->ecc_step_size) { + ecc_strength = pdata->ecc_strength; + ecc_step = pdata->ecc_step_size; + } else { + ecc_strength = chip->ecc_strength_ds; + ecc_step = chip->ecc_step_ds; + } + + /* Set default ECC strength requirements on non-ONFI devices */ + if (ecc_strength < 1 && ecc_step < 1) { + ecc_strength = 1; + ecc_step = 512; + } + + ret = pxa_ecc_init(info, &chip->ecc, ecc_strength, + ecc_step, mtd->writesize); + if (ret) + return ret; + + /* calculate addressing information */ + if (mtd->writesize >= 2048) + host->col_addr_cycles = 2; + else + host->col_addr_cycles = 1; + + /* release the initial buffer */ + kfree(info->data_buff); + + /* allocate the real data + oob buffer */ + info->buf_size = mtd->writesize + mtd->oobsize; + ret = pxa3xx_nand_init_buff(info); + if (ret) + return ret; + info->oob_buff = info->data_buff + mtd->writesize; + + if ((mtd->size >> chip->page_shift) > 65536) + host->row_addr_cycles = 3; + else + host->row_addr_cycles = 2; + return nand_scan_tail(mtd); +} + +static int alloc_nand_resource(struct pxa3xx_nand_info *info) +{ + struct pxa3xx_nand_platform_data *pdata; + struct pxa3xx_nand_host *host; + struct nand_chip *chip = NULL; + struct mtd_info *mtd; + int ret, cs; + + pdata = info->pdata; + if (pdata->num_cs <= 0) + return -ENODEV; + + info->variant = pxa3xx_nand_get_variant(); + for (cs = 0; cs < pdata->num_cs; cs++) { + mtd = &nand_info[cs]; + chip = (struct nand_chip *)info + + sizeof(struct pxa3xx_nand_host); + host = (struct pxa3xx_nand_host *)chip; + info->host[cs] = host; + host->mtd = mtd; + host->cs = cs; + host->info_data = info; + host->read_id_bytes = 4; + mtd->priv = host; + mtd->owner = THIS_MODULE; + + chip->ecc.read_page = pxa3xx_nand_read_page_hwecc; + chip->ecc.write_page = pxa3xx_nand_write_page_hwecc; + chip->controller = &info->controller; + chip->waitfunc = pxa3xx_nand_waitfunc; + chip->select_chip = pxa3xx_nand_select_chip; + chip->read_word = pxa3xx_nand_read_word; + chip->read_byte = pxa3xx_nand_read_byte; + chip->read_buf = pxa3xx_nand_read_buf; + chip->write_buf = pxa3xx_nand_write_buf; + chip->options |= NAND_NO_SUBPAGE_WRITE; + chip->cmdfunc = nand_cmdfunc; + } + + info->mmio_base = (void __iomem *)MVEBU_NAND_BASE; + + /* Allocate a buffer to allow flash detection */ + info->buf_size = INIT_BUFFER_SIZE; + info->data_buff = kmalloc(info->buf_size, GFP_KERNEL); + if (info->data_buff == NULL) { + ret = -ENOMEM; + goto fail_disable_clk; + } + + /* initialize all interrupts to be disabled */ + disable_int(info, NDSR_MASK); + + return 0; + + kfree(info->data_buff); +fail_disable_clk: + return ret; +} + +static int pxa3xx_nand_probe_dt(struct pxa3xx_nand_info *info) +{ + struct pxa3xx_nand_platform_data *pdata; + + pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + pdata->enable_arbiter = 1; + pdata->num_cs = 1; + + info->pdata = pdata; + + return 0; +} + +static int pxa3xx_nand_probe(struct pxa3xx_nand_info *info) +{ + struct pxa3xx_nand_platform_data *pdata; + int ret, cs, probe_success; + + ret = pxa3xx_nand_probe_dt(info); + if (ret) + return ret; + + pdata = info->pdata; + + ret = alloc_nand_resource(info); + if (ret) { + dev_err(&pdev->dev, "alloc nand resource failed\n"); + return ret; + } + + probe_success = 0; + for (cs = 0; cs < pdata->num_cs; cs++) { + struct mtd_info *mtd = info->host[cs]->mtd; + + /* + * The mtd name matches the one used in 'mtdparts' kernel + * parameter. This name cannot be changed or otherwise + * user's mtd partitions configuration would get broken. + */ + mtd->name = "pxa3xx_nand-0"; + info->cs = cs; + ret = pxa3xx_nand_scan(mtd); + if (ret) { + dev_info(&pdev->dev, "failed to scan nand at cs %d\n", + cs); + continue; + } + + if (!ret) + probe_success = 1; + } + + if (!probe_success) + return -ENODEV; + + return 0; +} + +/* + * Main initialization routine + */ +void board_nand_init(void) +{ + struct pxa3xx_nand_info *info; + struct pxa3xx_nand_host *host; + int ret; + + info = kzalloc(sizeof(*info) + (sizeof(struct mtd_info) + + sizeof(*host)) * + CONFIG_SYS_MAX_NAND_DEVICE, GFP_KERNEL); + if (!info) + return; + + /* + * If CONFIG_SYS_NAND_SELF_INIT is defined, each driver is responsible + * for instantiating struct nand_chip, while drivers/mtd/nand/nand.c + * still provides a "struct mtd_info nand_info" instance. + */ + info->host[0]->mtd = &nand_info[0]; + + ret = pxa3xx_nand_probe(info); + if (ret) + return; + + nand_register(0); +} |
