| /* |
| * drivers/mtd/nand/pxa3xx_nand.c |
| * |
| * Copyright © 2005 Intel Corporation |
| * Copyright © 2006 Marvell International Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/delay.h> |
| #include <linux/clk.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/nand.h> |
| #include <linux/mtd/partitions.h> |
| #include <linux/io.h> |
| #include <linux/irq.h> |
| #include <linux/slab.h> |
| |
| #include <mach/dma.h> |
| #include <plat/pxa3xx_nand.h> |
| |
| #define CHIP_DELAY_TIMEOUT (2 * HZ/10) |
| #define NAND_STOP_DELAY (2 * HZ/50) |
| #define PAGE_CHUNK_SIZE (2048) |
| |
| /* 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 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_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_DBERR (0x1 << 4) |
| #define NDSR_SBERR (0x1 << 3) |
| #define NDSR_WRDREQ (0x1 << 2) |
| #define NDSR_RDDREQ (0x1 << 1) |
| #define NDSR_WRCMDREQ (0x1) |
| |
| #define NDCB0_ST_ROW_EN (0x1 << 26) |
| #define NDCB0_AUTO_RS (0x1 << 25) |
| #define NDCB0_CSEL (0x1 << 24) |
| #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) |
| |
| /* macros for registers read/write */ |
| #define nand_writel(info, off, val) \ |
| __raw_writel((val), (info)->mmio_base + (off)) |
| |
| #define nand_readl(info, off) \ |
| __raw_readl((info)->mmio_base + (off)) |
| |
| /* error code and state */ |
| enum { |
| ERR_NONE = 0, |
| ERR_DMABUSERR = -1, |
| ERR_SENDCMD = -2, |
| ERR_DBERR = -3, |
| ERR_BBERR = -4, |
| ERR_SBERR = -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, |
| }; |
| |
| struct pxa3xx_nand_host { |
| struct nand_chip chip; |
| struct pxa3xx_nand_cmdset *cmdset; |
| struct mtd_info *mtd; |
| void *info_data; |
| |
| /* page size of attached chip */ |
| unsigned int page_size; |
| 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; |
| |
| /* cached register value */ |
| uint32_t reg_ndcr; |
| uint32_t ndtr0cs0; |
| uint32_t ndtr1cs0; |
| }; |
| |
| struct pxa3xx_nand_info { |
| struct nand_hw_control controller; |
| struct platform_device *pdev; |
| |
| struct clk *clk; |
| void __iomem *mmio_base; |
| unsigned long mmio_phys; |
| struct completion cmd_complete; |
| |
| unsigned int buf_start; |
| unsigned int buf_count; |
| |
| /* DMA information */ |
| int drcmr_dat; |
| int drcmr_cmd; |
| |
| unsigned char *data_buff; |
| unsigned char *oob_buff; |
| dma_addr_t data_buff_phys; |
| int data_dma_ch; |
| struct pxa_dma_desc *data_desc; |
| dma_addr_t data_desc_addr; |
| |
| struct pxa3xx_nand_host *host[NUM_CHIP_SELECT]; |
| unsigned int state; |
| |
| int cs; |
| int use_ecc; /* use HW ECC ? */ |
| int use_dma; /* use DMA ? */ |
| int is_ready; |
| |
| unsigned int page_size; /* page size of attached chip */ |
| unsigned int data_size; /* data size in FIFO */ |
| unsigned int oob_size; |
| int retcode; |
| |
| /* generated NDCBx register values */ |
| uint32_t ndcb0; |
| uint32_t ndcb1; |
| uint32_t ndcb2; |
| }; |
| |
| static bool use_dma = 1; |
| module_param(use_dma, bool, 0444); |
| MODULE_PARM_DESC(use_dma, "enable DMA for data transferring to/from NAND HW"); |
| |
| /* |
| * Default NAND flash controller configuration setup by the |
| * bootloader. This configuration is used only when pdata->keep_config is set |
| */ |
| static struct pxa3xx_nand_cmdset default_cmdset = { |
| .read1 = 0x3000, |
| .read2 = 0x0050, |
| .program = 0x1080, |
| .read_status = 0x0070, |
| .read_id = 0x0090, |
| .erase = 0xD060, |
| .reset = 0x00FF, |
| .lock = 0x002A, |
| .unlock = 0x2423, |
| .lock_status = 0x007A, |
| }; |
| |
| 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[] = { |
| { "DEFAULT FLASH", 0, 0, 2048, 8, 8, 0, &timing[0] }, |
| { "64MiB 16-bit", 0x46ec, 32, 512, 16, 16, 4096, &timing[1] }, |
| { "256MiB 8-bit", 0xdaec, 64, 2048, 8, 8, 2048, &timing[1] }, |
| { "4GiB 8-bit", 0xd7ec, 128, 4096, 8, 8, 8192, &timing[1] }, |
| { "128MiB 8-bit", 0xa12c, 64, 2048, 8, 8, 1024, &timing[2] }, |
| { "128MiB 16-bit", 0xb12c, 64, 2048, 16, 16, 1024, &timing[2] }, |
| { "512MiB 8-bit", 0xdc2c, 64, 2048, 8, 8, 4096, &timing[2] }, |
| { "512MiB 16-bit", 0xcc2c, 64, 2048, 16, 16, 4096, &timing[2] }, |
| { "256MiB 16-bit", 0xba20, 64, 2048, 16, 16, 2048, &timing[3] }, |
| }; |
| |
| /* Define a default flash type setting serve as flash detecting only */ |
| #define DEFAULT_FLASH_TYPE (&builtin_flash_types[0]) |
| |
| const char *mtd_names[] = {"pxa3xx_nand-0", "pxa3xx_nand-1", NULL}; |
| |
| #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 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 = clk_get_rate(info->clk); |
| 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)); |
| |
| host->ndtr0cs0 = ndtr0; |
| host->ndtr1cs0 = ndtr1; |
| nand_writel(info, NDTR0CS0, ndtr0); |
| nand_writel(info, NDTR1CS0, ndtr1); |
| } |
| |
| static void pxa3xx_set_datasize(struct pxa3xx_nand_info *info) |
| { |
| struct pxa3xx_nand_host *host = info->host[info->cs]; |
| int oob_enable = host->reg_ndcr & NDCR_SPARE_EN; |
| |
| info->data_size = host->page_size; |
| if (!oob_enable) { |
| info->oob_size = 0; |
| return; |
| } |
| |
| switch (host->page_size) { |
| case 2048: |
| info->oob_size = (info->use_ecc) ? 40 : 64; |
| break; |
| case 512: |
| info->oob_size = (info->use_ecc) ? 8 : 16; |
| break; |
| } |
| } |
| |
| /** |
| * 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) |
| { |
| struct pxa3xx_nand_host *host = info->host[info->cs]; |
| uint32_t ndcr; |
| |
| ndcr = host->reg_ndcr; |
| ndcr |= info->use_ecc ? NDCR_ECC_EN : 0; |
| ndcr |= info->use_dma ? NDCR_DMA_EN : 0; |
| 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 pxa3xx_nand_stop(struct pxa3xx_nand_info *info) |
| { |
| uint32_t ndcr; |
| int timeout = NAND_STOP_DELAY; |
| |
| /* wait RUN bit in NDCR become 0 */ |
| ndcr = nand_readl(info, NDCR); |
| while ((ndcr & NDCR_ND_RUN) && (timeout-- > 0)) { |
| ndcr = nand_readl(info, NDCR); |
| udelay(1); |
| } |
| |
| if (timeout <= 0) { |
| ndcr &= ~NDCR_ND_RUN; |
| nand_writel(info, NDCR, ndcr); |
| } |
| /* clear status bits */ |
| nand_writel(info, NDSR, NDSR_MASK); |
| } |
| |
| static void enable_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 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 handle_data_pio(struct pxa3xx_nand_info *info) |
| { |
| switch (info->state) { |
| case STATE_PIO_WRITING: |
| __raw_writesl(info->mmio_base + NDDB, info->data_buff, |
| DIV_ROUND_UP(info->data_size, 4)); |
| if (info->oob_size > 0) |
| __raw_writesl(info->mmio_base + NDDB, info->oob_buff, |
| DIV_ROUND_UP(info->oob_size, 4)); |
| break; |
| case STATE_PIO_READING: |
| __raw_readsl(info->mmio_base + NDDB, info->data_buff, |
| DIV_ROUND_UP(info->data_size, 4)); |
| if (info->oob_size > 0) |
| __raw_readsl(info->mmio_base + NDDB, info->oob_buff, |
| DIV_ROUND_UP(info->oob_size, 4)); |
| break; |
| default: |
| dev_err(&info->pdev->dev, "%s: invalid state %d\n", __func__, |
| info->state); |
| BUG(); |
| } |
| } |
| |
| static void start_data_dma(struct pxa3xx_nand_info *info) |
| { |
| struct pxa_dma_desc *desc = info->data_desc; |
| int dma_len = ALIGN(info->data_size + info->oob_size, 32); |
| |
| desc->ddadr = DDADR_STOP; |
| desc->dcmd = DCMD_ENDIRQEN | DCMD_WIDTH4 | DCMD_BURST32 | dma_len; |
| |
| switch (info->state) { |
| case STATE_DMA_WRITING: |
| desc->dsadr = info->data_buff_phys; |
| desc->dtadr = info->mmio_phys + NDDB; |
| desc->dcmd |= DCMD_INCSRCADDR | DCMD_FLOWTRG; |
| break; |
| case STATE_DMA_READING: |
| desc->dtadr = info->data_buff_phys; |
| desc->dsadr = info->mmio_phys + NDDB; |
| desc->dcmd |= DCMD_INCTRGADDR | DCMD_FLOWSRC; |
| break; |
| default: |
| dev_err(&info->pdev->dev, "%s: invalid state %d\n", __func__, |
| info->state); |
| BUG(); |
| } |
| |
| DRCMR(info->drcmr_dat) = DRCMR_MAPVLD | info->data_dma_ch; |
| DDADR(info->data_dma_ch) = info->data_desc_addr; |
| DCSR(info->data_dma_ch) |= DCSR_RUN; |
| } |
| |
| static void pxa3xx_nand_data_dma_irq(int channel, void *data) |
| { |
| struct pxa3xx_nand_info *info = data; |
| uint32_t dcsr; |
| |
| dcsr = DCSR(channel); |
| DCSR(channel) = dcsr; |
| |
| if (dcsr & DCSR_BUSERR) { |
| info->retcode = ERR_DMABUSERR; |
| } |
| |
| info->state = STATE_DMA_DONE; |
| enable_int(info, NDCR_INT_MASK); |
| nand_writel(info, NDSR, NDSR_WRDREQ | NDSR_RDDREQ); |
| } |
| |
| static irqreturn_t pxa3xx_nand_irq(int irq, void *devid) |
| { |
| struct pxa3xx_nand_info *info = devid; |
| unsigned int status, is_completed = 0; |
| unsigned int ready, cmd_done; |
| |
| 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_DBERR) |
| info->retcode = ERR_DBERR; |
| if (status & NDSR_SBERR) |
| info->retcode = ERR_SBERR; |
| if (status & (NDSR_RDDREQ | NDSR_WRDREQ)) { |
| /* whether use dma to transfer data */ |
| if (info->use_dma) { |
| disable_int(info, NDCR_INT_MASK); |
| info->state = (status & NDSR_RDDREQ) ? |
| STATE_DMA_READING : STATE_DMA_WRITING; |
| start_data_dma(info); |
| goto NORMAL_IRQ_EXIT; |
| } else { |
| info->state = (status & NDSR_RDDREQ) ? |
| STATE_PIO_READING : STATE_PIO_WRITING; |
| handle_data_pio(info); |
| } |
| } |
| if (status & cmd_done) { |
| info->state = STATE_CMD_DONE; |
| is_completed = 1; |
| } |
| if (status & ready) { |
| info->is_ready = 1; |
| info->state = STATE_READY; |
| } |
| |
| if (status & NDSR_WRCMDREQ) { |
| nand_writel(info, NDSR, NDSR_WRCMDREQ); |
| status &= ~NDSR_WRCMDREQ; |
| info->state = STATE_CMD_HANDLE; |
| nand_writel(info, NDCB0, info->ndcb0); |
| nand_writel(info, NDCB0, info->ndcb1); |
| nand_writel(info, NDCB0, info->ndcb2); |
| } |
| |
| /* clear NDSR to let the controller exit the IRQ */ |
| nand_writel(info, NDSR, status); |
| if (is_completed) |
| complete(&info->cmd_complete); |
| NORMAL_IRQ_EXIT: |
| return IRQ_HANDLED; |
| } |
| |
| static inline int is_buf_blank(uint8_t *buf, size_t len) |
| { |
| for (; len > 0; len--) |
| if (*buf++ != 0xff) |
| return 0; |
| return 1; |
| } |
| |
| static int prepare_command_pool(struct pxa3xx_nand_info *info, int command, |
| uint16_t column, int page_addr) |
| { |
| uint16_t cmd; |
| 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; |
| |
| /* reset data and oob column point to handle data */ |
| info->buf_start = 0; |
| info->buf_count = 0; |
| info->oob_size = 0; |
| info->use_ecc = 0; |
| info->is_ready = 0; |
| info->retcode = ERR_NONE; |
| if (info->cs != 0) |
| info->ndcb0 = NDCB0_CSEL; |
| else |
| info->ndcb0 = 0; |
| |
| switch (command) { |
| case NAND_CMD_READ0: |
| case NAND_CMD_PAGEPROG: |
| info->use_ecc = 1; |
| case NAND_CMD_READOOB: |
| pxa3xx_set_datasize(info); |
| break; |
| case NAND_CMD_SEQIN: |
| exec_cmd = 0; |
| break; |
| default: |
| info->ndcb1 = 0; |
| info->ndcb2 = 0; |
| break; |
| } |
| |
| addr_cycle = NDCB0_ADDR_CYC(host->row_addr_cycles |
| + host->col_addr_cycles); |
| |
| switch (command) { |
| case NAND_CMD_READOOB: |
| case NAND_CMD_READ0: |
| cmd = host->cmdset->read1; |
| if (command == NAND_CMD_READOOB) |
| info->buf_start = mtd->writesize + column; |
| else |
| info->buf_start = column; |
| |
| if (unlikely(host->page_size < PAGE_CHUNK_SIZE)) |
| info->ndcb0 |= NDCB0_CMD_TYPE(0) |
| | addr_cycle |
| | (cmd & NDCB0_CMD1_MASK); |
| else |
| info->ndcb0 |= NDCB0_CMD_TYPE(0) |
| | NDCB0_DBC |
| | addr_cycle |
| | cmd; |
| |
| case NAND_CMD_SEQIN: |
| /* small page addr setting */ |
| if (unlikely(host->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; |
| } |
| |
| info->buf_count = mtd->writesize + mtd->oobsize; |
| memset(info->data_buff, 0xFF, info->buf_count); |
| |
| break; |
| |
| case NAND_CMD_PAGEPROG: |
| if (is_buf_blank(info->data_buff, |
| (mtd->writesize + mtd->oobsize))) { |
| exec_cmd = 0; |
| break; |
| } |
| |
| cmd = host->cmdset->program; |
| info->ndcb0 |= NDCB0_CMD_TYPE(0x1) |
| | NDCB0_AUTO_RS |
| | NDCB0_ST_ROW_EN |
| | NDCB0_DBC |
| | cmd |
| | addr_cycle; |
| break; |
| |
| case NAND_CMD_READID: |
| cmd = host->cmdset->read_id; |
| info->buf_count = host->read_id_bytes; |
| info->ndcb0 |= NDCB0_CMD_TYPE(3) |
| | NDCB0_ADDR_CYC(1) |
| | cmd; |
| |
| info->data_size = 8; |
| break; |
| case NAND_CMD_STATUS: |
| cmd = host->cmdset->read_status; |
| info->buf_count = 1; |
| info->ndcb0 |= NDCB0_CMD_TYPE(4) |
| | NDCB0_ADDR_CYC(1) |
| | cmd; |
| |
| info->data_size = 8; |
| break; |
| |
| case NAND_CMD_ERASE1: |
| cmd = host->cmdset->erase; |
| info->ndcb0 |= NDCB0_CMD_TYPE(2) |
| | NDCB0_AUTO_RS |
| | NDCB0_ADDR_CYC(3) |
| | NDCB0_DBC |
| | cmd; |
| info->ndcb1 = page_addr; |
| info->ndcb2 = 0; |
| |
| break; |
| case NAND_CMD_RESET: |
| cmd = host->cmdset->reset; |
| info->ndcb0 |= NDCB0_CMD_TYPE(5) |
| | cmd; |
| |
| 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 pxa3xx_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 ret, 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 (host->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, host->ndtr0cs0); |
| nand_writel(info, NDTR1CS0, host->ndtr1cs0); |
| } |
| |
| info->state = STATE_PREPARED; |
| exec_cmd = prepare_command_pool(info, command, column, page_addr); |
| if (exec_cmd) { |
| init_completion(&info->cmd_complete); |
| pxa3xx_nand_start(info); |
| |
| ret = wait_for_completion_timeout(&info->cmd_complete, |
| CHIP_DELAY_TIMEOUT); |
| if (!ret) { |
| dev_err(&info->pdev->dev, "Wait time out!!!\n"); |
| /* Stop State Machine for next command cycle */ |
| pxa3xx_nand_stop(info); |
| } |
| } |
| info->state = STATE_IDLE; |
| } |
| |
| static void pxa3xx_nand_write_page_hwecc(struct mtd_info *mtd, |
| struct nand_chip *chip, const uint8_t *buf) |
| { |
| chip->write_buf(mtd, buf, mtd->writesize); |
| chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); |
| } |
| |
| static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd, |
| struct nand_chip *chip, uint8_t *buf, 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_SBERR) { |
| switch (info->use_ecc) { |
| case 1: |
| mtd->ecc_stats.corrected++; |
| break; |
| case 0: |
| default: |
| break; |
| } |
| } else if (info->retcode == ERR_DBERR) { |
| /* |
| * for blank page (all 0xff), HW will calculate its ECC as |
| * 0, which is different from the ECC information within |
| * OOB, ignore such double bit errors |
| */ |
| if (is_buf_blank(buf, mtd->writesize)) |
| info->retcode = ERR_NONE; |
| else |
| mtd->ecc_stats.failed++; |
| } |
| |
| return 0; |
| } |
| |
| 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 int pxa3xx_nand_verify_buf(struct mtd_info *mtd, |
| const uint8_t *buf, int len) |
| { |
| return 0; |
| } |
| |
| 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; |
| |
| /* 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 { |
| /* |
| * any error make it return 0x01 which will tell |
| * the caller the erase and write fail |
| */ |
| return 0x01; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info, |
| const struct pxa3xx_nand_flash *f) |
| { |
| struct platform_device *pdev = info->pdev; |
| struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data; |
| struct pxa3xx_nand_host *host = info->host[info->cs]; |
| uint32_t ndcr = 0x0; /* enable all interrupts */ |
| |
| if (f->page_size != 2048 && f->page_size != 512) { |
| dev_err(&pdev->dev, "Current only support 2048 and 512 size\n"); |
| return -EINVAL; |
| } |
| |
| if (f->flash_width != 16 && f->flash_width != 8) { |
| dev_err(&pdev->dev, "Only support 8bit and 16 bit!\n"); |
| return -EINVAL; |
| } |
| |
| /* calculate flash information */ |
| host->cmdset = &default_cmdset; |
| host->page_size = f->page_size; |
| host->read_id_bytes = (f->page_size == 2048) ? 4 : 2; |
| |
| /* calculate addressing information */ |
| host->col_addr_cycles = (f->page_size == 2048) ? 2 : 1; |
| |
| if (f->num_blocks * f->page_per_block > 65536) |
| host->row_addr_cycles = 3; |
| else |
| host->row_addr_cycles = 2; |
| |
| ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0; |
| ndcr |= (host->col_addr_cycles == 2) ? NDCR_RA_START : 0; |
| ndcr |= (f->page_per_block == 64) ? NDCR_PG_PER_BLK : 0; |
| ndcr |= (f->page_size == 2048) ? NDCR_PAGE_SZ : 0; |
| ndcr |= (f->flash_width == 16) ? NDCR_DWIDTH_M : 0; |
| ndcr |= (f->dfc_width == 16) ? NDCR_DWIDTH_C : 0; |
| |
| ndcr |= NDCR_RD_ID_CNT(host->read_id_bytes); |
| ndcr |= NDCR_SPARE_EN; /* enable spare by default */ |
| |
| host->reg_ndcr = ndcr; |
| |
| pxa3xx_nand_set_timing(host, f->timing); |
| 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) { |
| host->page_size = 2048; |
| host->read_id_bytes = 4; |
| } else { |
| host->page_size = 512; |
| host->read_id_bytes = 2; |
| } |
| |
| host->reg_ndcr = ndcr & ~NDCR_INT_MASK; |
| host->cmdset = &default_cmdset; |
| |
| host->ndtr0cs0 = nand_readl(info, NDTR0CS0); |
| host->ndtr1cs0 = nand_readl(info, NDTR1CS0); |
| |
| return 0; |
| } |
| |
| /* the maximum possible buffer size for large page with OOB data |
| * is: 2048 + 64 = 2112 bytes, allocate a page here for both the |
| * data buffer and the DMA descriptor |
| */ |
| #define MAX_BUFF_SIZE PAGE_SIZE |
| |
| static int pxa3xx_nand_init_buff(struct pxa3xx_nand_info *info) |
| { |
| struct platform_device *pdev = info->pdev; |
| int data_desc_offset = MAX_BUFF_SIZE - sizeof(struct pxa_dma_desc); |
| |
| if (use_dma == 0) { |
| info->data_buff = kmalloc(MAX_BUFF_SIZE, GFP_KERNEL); |
| if (info->data_buff == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| info->data_buff = dma_alloc_coherent(&pdev->dev, MAX_BUFF_SIZE, |
| &info->data_buff_phys, GFP_KERNEL); |
| if (info->data_buff == NULL) { |
| dev_err(&pdev->dev, "failed to allocate dma buffer\n"); |
| return -ENOMEM; |
| } |
| |
| info->data_desc = (void *)info->data_buff + data_desc_offset; |
| info->data_desc_addr = info->data_buff_phys + data_desc_offset; |
| |
| info->data_dma_ch = pxa_request_dma("nand-data", DMA_PRIO_LOW, |
| pxa3xx_nand_data_dma_irq, info); |
| if (info->data_dma_ch < 0) { |
| dev_err(&pdev->dev, "failed to request data dma\n"); |
| dma_free_coherent(&pdev->dev, MAX_BUFF_SIZE, |
| info->data_buff, info->data_buff_phys); |
| return info->data_dma_ch; |
| } |
| |
| return 0; |
| } |
| |
| static int pxa3xx_nand_sensing(struct pxa3xx_nand_info *info) |
| { |
| struct mtd_info *mtd; |
| int ret; |
| mtd = info->host[info->cs]->mtd; |
| /* use the common timing to make a try */ |
| ret = pxa3xx_nand_config_flash(info, &builtin_flash_types[0]); |
| if (ret) |
| return ret; |
| |
| pxa3xx_nand_cmdfunc(mtd, NAND_CMD_RESET, 0, 0); |
| if (info->is_ready) |
| return 0; |
| |
| return -ENODEV; |
| } |
| |
| 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 platform_device *pdev = info->pdev; |
| struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data; |
| struct nand_flash_dev pxa3xx_flash_ids[2], *def = NULL; |
| const struct pxa3xx_nand_flash *f = NULL; |
| struct nand_chip *chip = mtd->priv; |
| uint32_t id = -1; |
| uint64_t chipsize; |
| int i, ret, num; |
| |
| if (pdata->keep_config && !pxa3xx_nand_detect_config(info)) |
| goto KEEP_CONFIG; |
| |
| ret = pxa3xx_nand_sensing(info); |
| if (ret) { |
| dev_info(&info->pdev->dev, "There is no chip on cs %d!\n", |
| info->cs); |
| |
| return ret; |
| } |
| |
| chip->cmdfunc(mtd, NAND_CMD_READID, 0, 0); |
| id = *((uint16_t *)(info->data_buff)); |
| if (id != 0) |
| dev_info(&info->pdev->dev, "Detect a flash id %x\n", id); |
| else { |
| dev_warn(&info->pdev->dev, |
| "Read out ID 0, potential timing set wrong!!\n"); |
| |
| return -EINVAL; |
| } |
| |
| num = ARRAY_SIZE(builtin_flash_types) + pdata->num_flash - 1; |
| for (i = 0; i < num; i++) { |
| if (i < pdata->num_flash) |
| f = pdata->flash + i; |
| else |
| f = &builtin_flash_types[i - pdata->num_flash + 1]; |
| |
| /* find the chip in default list */ |
| if (f->chip_id == id) |
| break; |
| } |
| |
| if (i >= (ARRAY_SIZE(builtin_flash_types) + pdata->num_flash - 1)) { |
| dev_err(&info->pdev->dev, "ERROR!! flash not defined!!!\n"); |
| |
| return -EINVAL; |
| } |
| |
| ret = pxa3xx_nand_config_flash(info, f); |
| if (ret) { |
| dev_err(&info->pdev->dev, "ERROR! Configure failed\n"); |
| return ret; |
| } |
| |
| pxa3xx_flash_ids[0].name = f->name; |
| pxa3xx_flash_ids[0].id = (f->chip_id >> 8) & 0xffff; |
| pxa3xx_flash_ids[0].pagesize = f->page_size; |
| chipsize = (uint64_t)f->num_blocks * f->page_per_block * f->page_size; |
| pxa3xx_flash_ids[0].chipsize = chipsize >> 20; |
| pxa3xx_flash_ids[0].erasesize = f->page_size * f->page_per_block; |
| if (f->flash_width == 16) |
| pxa3xx_flash_ids[0].options = NAND_BUSWIDTH_16; |
| pxa3xx_flash_ids[1].name = NULL; |
| def = pxa3xx_flash_ids; |
| KEEP_CONFIG: |
| chip->ecc.mode = NAND_ECC_HW; |
| chip->ecc.size = host->page_size; |
| |
| chip->options = NAND_NO_AUTOINCR; |
| chip->options |= NAND_NO_READRDY; |
| if (host->reg_ndcr & NDCR_DWIDTH_M) |
| chip->options |= NAND_BUSWIDTH_16; |
| |
| if (nand_scan_ident(mtd, 1, def)) |
| return -ENODEV; |
| /* calculate addressing information */ |
| if (mtd->writesize >= 2048) |
| host->col_addr_cycles = 2; |
| else |
| host->col_addr_cycles = 1; |
| |
| 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; |
| |
| mtd->name = mtd_names[0]; |
| return nand_scan_tail(mtd); |
| } |
| |
| static int alloc_nand_resource(struct platform_device *pdev) |
| { |
| struct pxa3xx_nand_platform_data *pdata; |
| struct pxa3xx_nand_info *info; |
| struct pxa3xx_nand_host *host; |
| struct nand_chip *chip; |
| struct mtd_info *mtd; |
| struct resource *r; |
| int ret, irq, cs; |
| |
| pdata = pdev->dev.platform_data; |
| info = kzalloc(sizeof(*info) + (sizeof(*mtd) + |
| sizeof(*host)) * pdata->num_cs, GFP_KERNEL); |
| if (!info) { |
| dev_err(&pdev->dev, "failed to allocate memory\n"); |
| return -ENOMEM; |
| } |
| |
| info->pdev = pdev; |
| for (cs = 0; cs < pdata->num_cs; cs++) { |
| mtd = (struct mtd_info *)((unsigned int)&info[1] + |
| (sizeof(*mtd) + sizeof(*host)) * cs); |
| chip = (struct nand_chip *)(&mtd[1]); |
| host = (struct pxa3xx_nand_host *)chip; |
| info->host[cs] = host; |
| host->mtd = mtd; |
| host->cs = cs; |
| host->info_data = info; |
| 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->cmdfunc = pxa3xx_nand_cmdfunc; |
| 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->verify_buf = pxa3xx_nand_verify_buf; |
| } |
| |
| spin_lock_init(&chip->controller->lock); |
| init_waitqueue_head(&chip->controller->wq); |
| info->clk = clk_get(&pdev->dev, NULL); |
| if (IS_ERR(info->clk)) { |
| dev_err(&pdev->dev, "failed to get nand clock\n"); |
| ret = PTR_ERR(info->clk); |
| goto fail_free_mtd; |
| } |
| clk_enable(info->clk); |
| |
| r = platform_get_resource(pdev, IORESOURCE_DMA, 0); |
| if (r == NULL) { |
| dev_err(&pdev->dev, "no resource defined for data DMA\n"); |
| ret = -ENXIO; |
| goto fail_put_clk; |
| } |
| info->drcmr_dat = r->start; |
| |
| r = platform_get_resource(pdev, IORESOURCE_DMA, 1); |
| if (r == NULL) { |
| dev_err(&pdev->dev, "no resource defined for command DMA\n"); |
| ret = -ENXIO; |
| goto fail_put_clk; |
| } |
| info->drcmr_cmd = r->start; |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| dev_err(&pdev->dev, "no IRQ resource defined\n"); |
| ret = -ENXIO; |
| goto fail_put_clk; |
| } |
| |
| r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (r == NULL) { |
| dev_err(&pdev->dev, "no IO memory resource defined\n"); |
| ret = -ENODEV; |
| goto fail_put_clk; |
| } |
| |
| r = request_mem_region(r->start, resource_size(r), pdev->name); |
| if (r == NULL) { |
| dev_err(&pdev->dev, "failed to request memory resource\n"); |
| ret = -EBUSY; |
| goto fail_put_clk; |
| } |
| |
| info->mmio_base = ioremap(r->start, resource_size(r)); |
| if (info->mmio_base == NULL) { |
| dev_err(&pdev->dev, "ioremap() failed\n"); |
| ret = -ENODEV; |
| goto fail_free_res; |
| } |
| info->mmio_phys = r->start; |
| |
| ret = pxa3xx_nand_init_buff(info); |
| if (ret) |
| goto fail_free_io; |
| |
| /* initialize all interrupts to be disabled */ |
| disable_int(info, NDSR_MASK); |
| |
| ret = request_irq(irq, pxa3xx_nand_irq, IRQF_DISABLED, |
| pdev->name, info); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "failed to request IRQ\n"); |
| goto fail_free_buf; |
| } |
| |
| platform_set_drvdata(pdev, info); |
| |
| return 0; |
| |
| fail_free_buf: |
| free_irq(irq, info); |
| if (use_dma) { |
| pxa_free_dma(info->data_dma_ch); |
| dma_free_coherent(&pdev->dev, MAX_BUFF_SIZE, |
| info->data_buff, info->data_buff_phys); |
| } else |
| kfree(info->data_buff); |
| fail_free_io: |
| iounmap(info->mmio_base); |
| fail_free_res: |
| release_mem_region(r->start, resource_size(r)); |
| fail_put_clk: |
| clk_disable(info->clk); |
| clk_put(info->clk); |
| fail_free_mtd: |
| kfree(info); |
| return ret; |
| } |
| |
| static int pxa3xx_nand_remove(struct platform_device *pdev) |
| { |
| struct pxa3xx_nand_info *info = platform_get_drvdata(pdev); |
| struct pxa3xx_nand_platform_data *pdata; |
| struct resource *r; |
| int irq, cs; |
| |
| if (!info) |
| return 0; |
| |
| pdata = pdev->dev.platform_data; |
| platform_set_drvdata(pdev, NULL); |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq >= 0) |
| free_irq(irq, info); |
| if (use_dma) { |
| pxa_free_dma(info->data_dma_ch); |
| dma_free_writecombine(&pdev->dev, MAX_BUFF_SIZE, |
| info->data_buff, info->data_buff_phys); |
| } else |
| kfree(info->data_buff); |
| |
| iounmap(info->mmio_base); |
| r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| release_mem_region(r->start, resource_size(r)); |
| |
| clk_disable(info->clk); |
| clk_put(info->clk); |
| |
| for (cs = 0; cs < pdata->num_cs; cs++) |
| nand_release(info->host[cs]->mtd); |
| kfree(info); |
| return 0; |
| } |
| |
| static int pxa3xx_nand_probe(struct platform_device *pdev) |
| { |
| struct pxa3xx_nand_platform_data *pdata; |
| struct pxa3xx_nand_info *info; |
| int ret, cs, probe_success; |
| |
| pdata = pdev->dev.platform_data; |
| if (!pdata) { |
| dev_err(&pdev->dev, "no platform data defined\n"); |
| return -ENODEV; |
| } |
| |
| ret = alloc_nand_resource(pdev); |
| if (ret) { |
| dev_err(&pdev->dev, "alloc nand resource failed\n"); |
| return ret; |
| } |
| |
| info = platform_get_drvdata(pdev); |
| probe_success = 0; |
| for (cs = 0; cs < pdata->num_cs; cs++) { |
| info->cs = cs; |
| ret = pxa3xx_nand_scan(info->host[cs]->mtd); |
| if (ret) { |
| dev_warn(&pdev->dev, "failed to scan nand at cs %d\n", |
| cs); |
| continue; |
| } |
| |
| ret = mtd_device_parse_register(info->host[cs]->mtd, NULL, 0, |
| pdata->parts[cs], pdata->nr_parts[cs]); |
| if (!ret) |
| probe_success = 1; |
| } |
| |
| if (!probe_success) { |
| pxa3xx_nand_remove(pdev); |
| return -ENODEV; |
| } |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state) |
| { |
| struct pxa3xx_nand_info *info = platform_get_drvdata(pdev); |
| struct pxa3xx_nand_platform_data *pdata; |
| struct mtd_info *mtd; |
| int cs; |
| |
| pdata = pdev->dev.platform_data; |
| if (info->state) { |
| dev_err(&pdev->dev, "driver busy, state = %d\n", info->state); |
| return -EAGAIN; |
| } |
| |
| for (cs = 0; cs < pdata->num_cs; cs++) { |
| mtd = info->host[cs]->mtd; |
| mtd_suspend(mtd); |
| } |
| |
| return 0; |
| } |
| |
| static int pxa3xx_nand_resume(struct platform_device *pdev) |
| { |
| struct pxa3xx_nand_info *info = platform_get_drvdata(pdev); |
| struct pxa3xx_nand_platform_data *pdata; |
| struct mtd_info *mtd; |
| int cs; |
| |
| pdata = pdev->dev.platform_data; |
| /* We don't want to handle interrupt without calling mtd routine */ |
| disable_int(info, NDCR_INT_MASK); |
| |
| /* |
| * Directly set the chip select to a invalid value, |
| * then the driver would reset the timing according |
| * to current chip select at the beginning of cmdfunc |
| */ |
| info->cs = 0xff; |
| |
| /* |
| * As the spec says, the NDSR would be updated to 0x1800 when |
| * doing the nand_clk disable/enable. |
| * To prevent it damaging state machine of the driver, clear |
| * all status before resume |
| */ |
| nand_writel(info, NDSR, NDSR_MASK); |
| for (cs = 0; cs < pdata->num_cs; cs++) { |
| mtd = info->host[cs]->mtd; |
| mtd_resume(mtd); |
| } |
| |
| return 0; |
| } |
| #else |
| #define pxa3xx_nand_suspend NULL |
| #define pxa3xx_nand_resume NULL |
| #endif |
| |
| static struct platform_driver pxa3xx_nand_driver = { |
| .driver = { |
| .name = "pxa3xx-nand", |
| }, |
| .probe = pxa3xx_nand_probe, |
| .remove = pxa3xx_nand_remove, |
| .suspend = pxa3xx_nand_suspend, |
| .resume = pxa3xx_nand_resume, |
| }; |
| |
| module_platform_driver(pxa3xx_nand_driver); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("PXA3xx NAND controller driver"); |