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OpenCloudOS-Kernel/drivers/mtd/nand/pxa3xx_nand.c

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/*
* 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/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 <mach/dma.h>
#include <mach/pxa3xx_nand.h>
#define CHIP_DELAY_TIMEOUT (2 * HZ/10)
/* 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_CLR_ECC (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 NDSR_MASK (0xfff)
#define NDSR_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_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)
/* dma-able I/O address for the NAND data and commands */
#define NDCB0_DMA_ADDR (0x43100048)
#define NDDB_DMA_ADDR (0x43100040)
/* 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,
};
enum {
STATE_READY = 0,
STATE_CMD_HANDLE,
STATE_DMA_READING,
STATE_DMA_WRITING,
STATE_DMA_DONE,
STATE_PIO_READING,
STATE_PIO_WRITING,
};
struct pxa3xx_nand_info {
struct nand_chip nand_chip;
struct platform_device *pdev;
const struct pxa3xx_nand_flash *flash_info;
struct clk *clk;
void __iomem *mmio_base;
unsigned int buf_start;
unsigned int buf_count;
/* DMA information */
int drcmr_dat;
int drcmr_cmd;
unsigned char *data_buff;
dma_addr_t data_buff_phys;
size_t data_buff_size;
int data_dma_ch;
struct pxa_dma_desc *data_desc;
dma_addr_t data_desc_addr;
uint32_t reg_ndcr;
/* saved column/page_addr during CMD_SEQIN */
int seqin_column;
int seqin_page_addr;
/* relate to the command */
unsigned int state;
int use_ecc; /* use HW ECC ? */
int use_dma; /* use DMA ? */
size_t data_size; /* data size in FIFO */
int retcode;
struct completion cmd_complete;
/* generated NDCBx register values */
uint32_t ndcb0;
uint32_t ndcb1;
uint32_t ndcb2;
/* calculated from pxa3xx_nand_flash data */
size_t oob_size;
size_t read_id_bytes;
unsigned int col_addr_cycles;
unsigned int row_addr_cycles;
};
static int use_dma = 1;
module_param(use_dma, bool, 0444);
MODULE_PARM_DESC(use_dma, "enable DMA for data transfering to/from NAND HW");
#ifdef CONFIG_MTD_NAND_PXA3xx_BUILTIN
static struct pxa3xx_nand_cmdset smallpage_cmdset = {
.read1 = 0x0000,
.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_cmdset largepage_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 samsung512MbX16_timing = {
.tCH = 10,
.tCS = 0,
.tWH = 20,
.tWP = 40,
.tRH = 30,
.tRP = 40,
.tR = 11123,
.tWHR = 110,
.tAR = 10,
};
static struct pxa3xx_nand_flash samsung512MbX16 = {
.timing = &samsung512MbX16_timing,
.cmdset = &smallpage_cmdset,
.page_per_block = 32,
.page_size = 512,
.flash_width = 16,
.dfc_width = 16,
.num_blocks = 4096,
.chip_id = 0x46ec,
};
static struct pxa3xx_nand_timing micron_timing = {
.tCH = 10,
.tCS = 25,
.tWH = 15,
.tWP = 25,
.tRH = 15,
.tRP = 25,
.tR = 25000,
.tWHR = 60,
.tAR = 10,
};
static struct pxa3xx_nand_flash micron1GbX8 = {
.timing = &micron_timing,
.cmdset = &largepage_cmdset,
.page_per_block = 64,
.page_size = 2048,
.flash_width = 8,
.dfc_width = 8,
.num_blocks = 1024,
.chip_id = 0xa12c,
};
static struct pxa3xx_nand_flash micron1GbX16 = {
.timing = &micron_timing,
.cmdset = &largepage_cmdset,
.page_per_block = 64,
.page_size = 2048,
.flash_width = 16,
.dfc_width = 16,
.num_blocks = 1024,
.chip_id = 0xb12c,
};
static struct pxa3xx_nand_timing stm2GbX16_timing = {
.tCH = 10,
.tCS = 35,
.tWH = 15,
.tWP = 25,
.tRH = 15,
.tRP = 25,
.tR = 25000,
.tWHR = 60,
.tAR = 10,
};
static struct pxa3xx_nand_flash stm2GbX16 = {
.timing = &stm2GbX16_timing,
.cmdset = &largepage_cmdset,
.page_per_block = 64,
.page_size = 2048,
.flash_width = 16,
.dfc_width = 16,
.num_blocks = 2048,
.chip_id = 0xba20,
};
static struct pxa3xx_nand_flash *builtin_flash_types[] = {
&samsung512MbX16,
&micron1GbX8,
&micron1GbX16,
&stm2GbX16,
};
#endif /* CONFIG_MTD_NAND_PXA3xx_BUILTIN */
#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) - 1)
static void pxa3xx_nand_set_timing(struct pxa3xx_nand_info *info,
const struct pxa3xx_nand_timing *t)
{
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));
nand_writel(info, NDTR0CS0, ndtr0);
nand_writel(info, NDTR1CS0, ndtr1);
}
#define WAIT_EVENT_TIMEOUT 10
static int wait_for_event(struct pxa3xx_nand_info *info, uint32_t event)
{
int timeout = WAIT_EVENT_TIMEOUT;
uint32_t ndsr;
while (timeout--) {
ndsr = nand_readl(info, NDSR) & NDSR_MASK;
if (ndsr & event) {
nand_writel(info, NDSR, ndsr);
return 0;
}
udelay(10);
}
return -ETIMEDOUT;
}
static int prepare_read_prog_cmd(struct pxa3xx_nand_info *info,
uint16_t cmd, int column, int page_addr)
{
const struct pxa3xx_nand_flash *f = info->flash_info;
const struct pxa3xx_nand_cmdset *cmdset = f->cmdset;
/* calculate data size */
switch (f->page_size) {
case 2048:
info->data_size = (info->use_ecc) ? 2088 : 2112;
break;
case 512:
info->data_size = (info->use_ecc) ? 520 : 528;
break;
default:
return -EINVAL;
}
/* generate values for NDCBx registers */
info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
info->ndcb1 = 0;
info->ndcb2 = 0;
info->ndcb0 |= NDCB0_ADDR_CYC(info->row_addr_cycles + info->col_addr_cycles);
if (info->col_addr_cycles == 2) {
/* large block, 2 cycles for column address
* row address starts from 3rd cycle
*/
info->ndcb1 |= page_addr << 16;
if (info->row_addr_cycles == 3)
info->ndcb2 = (page_addr >> 16) & 0xff;
} else
/* small block, 1 cycles for column address
* row address starts from 2nd cycle
*/
info->ndcb1 = page_addr << 8;
if (cmd == cmdset->program)
info->ndcb0 |= NDCB0_CMD_TYPE(1) | NDCB0_AUTO_RS;
return 0;
}
static int prepare_erase_cmd(struct pxa3xx_nand_info *info,
uint16_t cmd, int page_addr)
{
info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
info->ndcb0 |= NDCB0_CMD_TYPE(2) | NDCB0_AUTO_RS | NDCB0_ADDR_CYC(3);
info->ndcb1 = page_addr;
info->ndcb2 = 0;
return 0;
}
static int prepare_other_cmd(struct pxa3xx_nand_info *info, uint16_t cmd)
{
const struct pxa3xx_nand_cmdset *cmdset = info->flash_info->cmdset;
info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
info->ndcb1 = 0;
info->ndcb2 = 0;
if (cmd == cmdset->read_id) {
info->ndcb0 |= NDCB0_CMD_TYPE(3);
info->data_size = 8;
} else if (cmd == cmdset->read_status) {
info->ndcb0 |= NDCB0_CMD_TYPE(4);
info->data_size = 8;
} else if (cmd == cmdset->reset || cmd == cmdset->lock ||
cmd == cmdset->unlock) {
info->ndcb0 |= NDCB0_CMD_TYPE(5);
} else
return -EINVAL;
return 0;
}
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);
}
/* NOTE: it is a must to set ND_RUN firstly, then write command buffer
* otherwise, it does not work
*/
static int write_cmd(struct pxa3xx_nand_info *info)
{
uint32_t ndcr;
/* clear status bits and run */
nand_writel(info, NDSR, NDSR_MASK);
ndcr = info->reg_ndcr;
ndcr |= info->use_ecc ? NDCR_ECC_EN : 0;
ndcr |= info->use_dma ? NDCR_DMA_EN : 0;
ndcr |= NDCR_ND_RUN;
nand_writel(info, NDCR, ndcr);
if (wait_for_event(info, NDSR_WRCMDREQ)) {
printk(KERN_ERR "timed out writing command\n");
return -ETIMEDOUT;
}
nand_writel(info, NDCB0, info->ndcb0);
nand_writel(info, NDCB0, info->ndcb1);
nand_writel(info, NDCB0, info->ndcb2);
return 0;
}
static int handle_data_pio(struct pxa3xx_nand_info *info)
{
int ret, timeout = CHIP_DELAY_TIMEOUT;
switch (info->state) {
case STATE_PIO_WRITING:
__raw_writesl(info->mmio_base + NDDB, info->data_buff,
info->data_size << 2);
enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
if (!ret) {
printk(KERN_ERR "program command time out\n");
return -1;
}
break;
case STATE_PIO_READING:
__raw_readsl(info->mmio_base + NDDB, info->data_buff,
info->data_size << 2);
break;
default:
printk(KERN_ERR "%s: invalid state %d\n", __func__,
info->state);
return -EINVAL;
}
info->state = STATE_READY;
return 0;
}
static void start_data_dma(struct pxa3xx_nand_info *info, int dir_out)
{
struct pxa_dma_desc *desc = info->data_desc;
int dma_len = ALIGN(info->data_size, 32);
desc->ddadr = DDADR_STOP;
desc->dcmd = DCMD_ENDIRQEN | DCMD_WIDTH4 | DCMD_BURST32 | dma_len;
if (dir_out) {
desc->dsadr = info->data_buff_phys;
desc->dtadr = NDDB_DMA_ADDR;
desc->dcmd |= DCMD_INCSRCADDR | DCMD_FLOWTRG;
} else {
desc->dtadr = info->data_buff_phys;
desc->dsadr = NDDB_DMA_ADDR;
desc->dcmd |= DCMD_INCTRGADDR | DCMD_FLOWSRC;
}
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;
complete(&info->cmd_complete);
}
if (info->state == STATE_DMA_WRITING) {
info->state = STATE_DMA_DONE;
enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
} else {
info->state = STATE_READY;
complete(&info->cmd_complete);
}
}
static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
{
struct pxa3xx_nand_info *info = devid;
unsigned int status;
status = nand_readl(info, NDSR);
if (status & (NDSR_RDDREQ | NDSR_DBERR)) {
if (status & NDSR_DBERR)
info->retcode = ERR_DBERR;
disable_int(info, NDSR_RDDREQ | NDSR_DBERR);
if (info->use_dma) {
info->state = STATE_DMA_READING;
start_data_dma(info, 0);
} else {
info->state = STATE_PIO_READING;
complete(&info->cmd_complete);
}
} else if (status & NDSR_WRDREQ) {
disable_int(info, NDSR_WRDREQ);
if (info->use_dma) {
info->state = STATE_DMA_WRITING;
start_data_dma(info, 1);
} else {
info->state = STATE_PIO_WRITING;
complete(&info->cmd_complete);
}
} else if (status & (NDSR_CS0_BBD | NDSR_CS0_CMDD)) {
if (status & NDSR_CS0_BBD)
info->retcode = ERR_BBERR;
disable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
info->state = STATE_READY;
complete(&info->cmd_complete);
}
nand_writel(info, NDSR, status);
return IRQ_HANDLED;
}
static int pxa3xx_nand_do_cmd(struct pxa3xx_nand_info *info, uint32_t event)
{
uint32_t ndcr;
int ret, timeout = CHIP_DELAY_TIMEOUT;
if (write_cmd(info)) {
info->retcode = ERR_SENDCMD;
goto fail_stop;
}
info->state = STATE_CMD_HANDLE;
enable_int(info, event);
ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
if (!ret) {
printk(KERN_ERR "command execution timed out\n");
info->retcode = ERR_SENDCMD;
goto fail_stop;
}
if (info->use_dma == 0 && info->data_size > 0)
if (handle_data_pio(info))
goto fail_stop;
return 0;
fail_stop:
ndcr = nand_readl(info, NDCR);
nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
udelay(10);
return -ETIMEDOUT;
}
static int pxa3xx_nand_dev_ready(struct mtd_info *mtd)
{
struct pxa3xx_nand_info *info = mtd->priv;
return (nand_readl(info, NDSR) & NDSR_RDY) ? 1 : 0;
}
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 pxa3xx_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
int column, int page_addr)
{
struct pxa3xx_nand_info *info = mtd->priv;
const struct pxa3xx_nand_flash *flash_info = info->flash_info;
const struct pxa3xx_nand_cmdset *cmdset = flash_info->cmdset;
int ret;
info->use_dma = (use_dma) ? 1 : 0;
info->use_ecc = 0;
info->data_size = 0;
info->state = STATE_READY;
init_completion(&info->cmd_complete);
switch (command) {
case NAND_CMD_READOOB:
/* disable HW ECC to get all the OOB data */
info->buf_count = mtd->writesize + mtd->oobsize;
info->buf_start = mtd->writesize + column;
if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
break;
pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR);
/* We only are OOB, so if the data has error, does not matter */
if (info->retcode == ERR_DBERR)
info->retcode = ERR_NONE;
break;
case NAND_CMD_READ0:
info->use_ecc = 1;
info->retcode = ERR_NONE;
info->buf_start = column;
info->buf_count = mtd->writesize + mtd->oobsize;
memset(info->data_buff, 0xFF, info->buf_count);
if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
break;
pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR);
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(info->data_buff, mtd->writesize))
info->retcode = ERR_NONE;
}
break;
case NAND_CMD_SEQIN:
info->buf_start = column;
info->buf_count = mtd->writesize + mtd->oobsize;
memset(info->data_buff, 0xff, info->buf_count);
/* save column/page_addr for next CMD_PAGEPROG */
info->seqin_column = column;
info->seqin_page_addr = page_addr;
break;
case NAND_CMD_PAGEPROG:
info->use_ecc = (info->seqin_column >= mtd->writesize) ? 0 : 1;
if (prepare_read_prog_cmd(info, cmdset->program,
info->seqin_column, info->seqin_page_addr))
break;
pxa3xx_nand_do_cmd(info, NDSR_WRDREQ);
break;
case NAND_CMD_ERASE1:
if (prepare_erase_cmd(info, cmdset->erase, page_addr))
break;
pxa3xx_nand_do_cmd(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
break;
case NAND_CMD_ERASE2:
break;
case NAND_CMD_READID:
case NAND_CMD_STATUS:
info->use_dma = 0; /* force PIO read */
info->buf_start = 0;
info->buf_count = (command == NAND_CMD_READID) ?
info->read_id_bytes : 1;
if (prepare_other_cmd(info, (command == NAND_CMD_READID) ?
cmdset->read_id : cmdset->read_status))
break;
pxa3xx_nand_do_cmd(info, NDSR_RDDREQ);
break;
case NAND_CMD_RESET:
if (prepare_other_cmd(info, cmdset->reset))
break;
ret = pxa3xx_nand_do_cmd(info, NDSR_CS0_CMDD);
if (ret == 0) {
int timeout = 2;
uint32_t ndcr;
while (timeout--) {
if (nand_readl(info, NDSR) & NDSR_RDY)
break;
msleep(10);
}
ndcr = nand_readl(info, NDCR);
nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
}
break;
default:
printk(KERN_ERR "non-supported command.\n");
break;
}
if (info->retcode == ERR_DBERR) {
printk(KERN_ERR "double bit error @ page %08x\n", page_addr);
info->retcode = ERR_NONE;
}
}
static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
{
struct pxa3xx_nand_info *info = mtd->priv;
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_info *info = mtd->priv;
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_info *info = mtd->priv;
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_info *info = mtd->priv;
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_info *info = mtd->priv;
/* 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 void pxa3xx_nand_ecc_hwctl(struct mtd_info *mtd, int mode)
{
return;
}
static int pxa3xx_nand_ecc_calculate(struct mtd_info *mtd,
const uint8_t *dat, uint8_t *ecc_code)
{
return 0;
}
static int pxa3xx_nand_ecc_correct(struct mtd_info *mtd,
uint8_t *dat, uint8_t *read_ecc, uint8_t *calc_ecc)
{
struct pxa3xx_nand_info *info = mtd->priv;
/*
* Any error include ERR_SEND_CMD, ERR_DBERR, ERR_BUSERR, we
* consider it as a ecc error which will tell the caller the
* read fail We have distinguish all the errors, but the
* nand_read_ecc only check this function return value
*/
if (info->retcode != ERR_NONE)
return -1;
return 0;
}
static int __readid(struct pxa3xx_nand_info *info, uint32_t *id)
{
const struct pxa3xx_nand_flash *f = info->flash_info;
const struct pxa3xx_nand_cmdset *cmdset = f->cmdset;
uint32_t ndcr;
uint8_t id_buff[8];
if (prepare_other_cmd(info, cmdset->read_id)) {
printk(KERN_ERR "failed to prepare command\n");
return -EINVAL;
}
/* Send command */
if (write_cmd(info))
goto fail_timeout;
/* Wait for CMDDM(command done successfully) */
if (wait_for_event(info, NDSR_RDDREQ))
goto fail_timeout;
__raw_readsl(info->mmio_base + NDDB, id_buff, 2);
*id = id_buff[0] | (id_buff[1] << 8);
return 0;
fail_timeout:
ndcr = nand_readl(info, NDCR);
nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
udelay(10);
return -ETIMEDOUT;
}
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;
uint32_t ndcr = 0x00000FFF; /* disable all interrupts */
if (f->page_size != 2048 && f->page_size != 512)
return -EINVAL;
if (f->flash_width != 16 && f->flash_width != 8)
return -EINVAL;
/* calculate flash information */
info->oob_size = (f->page_size == 2048) ? 64 : 16;
info->read_id_bytes = (f->page_size == 2048) ? 4 : 2;
/* calculate addressing information */
info->col_addr_cycles = (f->page_size == 2048) ? 2 : 1;
if (f->num_blocks * f->page_per_block > 65536)
info->row_addr_cycles = 3;
else
info->row_addr_cycles = 2;
ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0;
ndcr |= (info->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(info->read_id_bytes);
ndcr |= NDCR_SPARE_EN; /* enable spare by default */
info->reg_ndcr = ndcr;
pxa3xx_nand_set_timing(info, f->timing);
info->flash_info = f;
return 0;
}
static int pxa3xx_nand_detect_flash(struct pxa3xx_nand_info *info,
const struct pxa3xx_nand_platform_data *pdata)
{
const struct pxa3xx_nand_flash *f;
uint32_t id = -1;
int i;
for (i = 0; i<pdata->num_flash; ++i) {
f = pdata->flash + i;
if (pxa3xx_nand_config_flash(info, f))
continue;
if (__readid(info, &id))
continue;
if (id == f->chip_id)
return 0;
}
#ifdef CONFIG_MTD_NAND_PXA3xx_BUILTIN
for (i = 0; i < ARRAY_SIZE(builtin_flash_types); i++) {
f = builtin_flash_types[i];
if (pxa3xx_nand_config_flash(info, f))
continue;
if (__readid(info, &id))
continue;
if (id == f->chip_id)
return 0;
}
#endif
dev_warn(&info->pdev->dev,
"failed to detect configured nand flash; found %04x instead of\n",
id);
return -ENODEV;
}
/* 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_buff_size = MAX_BUFF_SIZE;
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, info->data_buff_size,
info->data_buff, info->data_buff_phys);
return info->data_dma_ch;
}
return 0;
}
static struct nand_ecclayout hw_smallpage_ecclayout = {
.eccbytes = 6,
.eccpos = {8, 9, 10, 11, 12, 13 },
.oobfree = { {2, 6} }
};
static struct nand_ecclayout hw_largepage_ecclayout = {
.eccbytes = 24,
.eccpos = {
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, 38} }
};
static void pxa3xx_nand_init_mtd(struct mtd_info *mtd,
struct pxa3xx_nand_info *info)
{
const struct pxa3xx_nand_flash *f = info->flash_info;
struct nand_chip *this = &info->nand_chip;
this->options = (f->flash_width == 16) ? NAND_BUSWIDTH_16: 0;
this->waitfunc = pxa3xx_nand_waitfunc;
this->select_chip = pxa3xx_nand_select_chip;
this->dev_ready = pxa3xx_nand_dev_ready;
this->cmdfunc = pxa3xx_nand_cmdfunc;
this->read_word = pxa3xx_nand_read_word;
this->read_byte = pxa3xx_nand_read_byte;
this->read_buf = pxa3xx_nand_read_buf;
this->write_buf = pxa3xx_nand_write_buf;
this->verify_buf = pxa3xx_nand_verify_buf;
this->ecc.mode = NAND_ECC_HW;
this->ecc.hwctl = pxa3xx_nand_ecc_hwctl;
this->ecc.calculate = pxa3xx_nand_ecc_calculate;
this->ecc.correct = pxa3xx_nand_ecc_correct;
this->ecc.size = f->page_size;
if (f->page_size == 2048)
this->ecc.layout = &hw_largepage_ecclayout;
else
this->ecc.layout = &hw_smallpage_ecclayout;
this->chip_delay = 25;
}
static int pxa3xx_nand_probe(struct platform_device *pdev)
{
struct pxa3xx_nand_platform_data *pdata;
struct pxa3xx_nand_info *info;
struct nand_chip *this;
struct mtd_info *mtd;
struct resource *r;
int ret = 0, irq;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data defined\n");
return -ENODEV;
}
mtd = kzalloc(sizeof(struct mtd_info) + sizeof(struct pxa3xx_nand_info),
GFP_KERNEL);
if (!mtd) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
info = (struct pxa3xx_nand_info *)(&mtd[1]);
info->pdev = pdev;
this = &info->nand_chip;
mtd->priv = info;
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, r->end - r->start + 1, 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, r->end - r->start + 1);
if (info->mmio_base == NULL) {
dev_err(&pdev->dev, "ioremap() failed\n");
ret = -ENODEV;
goto fail_free_res;
}
ret = pxa3xx_nand_init_buff(info);
if (ret)
goto fail_free_io;
ret = request_irq(IRQ_NAND, pxa3xx_nand_irq, IRQF_DISABLED,
pdev->name, info);
if (ret < 0) {
dev_err(&pdev->dev, "failed to request IRQ\n");
goto fail_free_buf;
}
ret = pxa3xx_nand_detect_flash(info, pdata);
if (ret) {
dev_err(&pdev->dev, "failed to detect flash\n");
ret = -ENODEV;
goto fail_free_irq;
}
pxa3xx_nand_init_mtd(mtd, info);
platform_set_drvdata(pdev, mtd);
if (nand_scan(mtd, 1)) {
dev_err(&pdev->dev, "failed to scan nand\n");
ret = -ENXIO;
goto fail_free_irq;
}
return add_mtd_partitions(mtd, pdata->parts, pdata->nr_parts);
fail_free_irq:
free_irq(IRQ_NAND, info);
fail_free_buf:
if (use_dma) {
pxa_free_dma(info->data_dma_ch);
dma_free_coherent(&pdev->dev, info->data_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, r->end - r->start + 1);
fail_put_clk:
clk_disable(info->clk);
clk_put(info->clk);
fail_free_mtd:
kfree(mtd);
return ret;
}
static int pxa3xx_nand_remove(struct platform_device *pdev)
{
struct mtd_info *mtd = platform_get_drvdata(pdev);
struct pxa3xx_nand_info *info = mtd->priv;
platform_set_drvdata(pdev, NULL);
del_mtd_device(mtd);
del_mtd_partitions(mtd);
free_irq(IRQ_NAND, info);
if (use_dma) {
pxa_free_dma(info->data_dma_ch);
dma_free_writecombine(&pdev->dev, info->data_buff_size,
info->data_buff, info->data_buff_phys);
} else
kfree(info->data_buff);
kfree(mtd);
return 0;
}
#ifdef CONFIG_PM
static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state)
{
struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
struct pxa3xx_nand_info *info = mtd->priv;
if (info->state != STATE_READY) {
dev_err(&pdev->dev, "driver busy, state = %d\n", info->state);
return -EAGAIN;
}
return 0;
}
static int pxa3xx_nand_resume(struct platform_device *pdev)
{
struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
struct pxa3xx_nand_info *info = mtd->priv;
clk_enable(info->clk);
return pxa3xx_nand_config_flash(info, info->flash_info);
}
#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,
};
static int __init pxa3xx_nand_init(void)
{
return platform_driver_register(&pxa3xx_nand_driver);
}
module_init(pxa3xx_nand_init);
static void __exit pxa3xx_nand_exit(void)
{
platform_driver_unregister(&pxa3xx_nand_driver);
}
module_exit(pxa3xx_nand_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PXA3xx NAND controller driver");
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