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android-kvm / linux / a8bb6f44b5cfc20a2a95bb856b40db11829778c1 / . / drivers / mtd / nand / raw / omap2.c
blob: c45bef6158e7ac773b0bf0bbe8a3835746a14198 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright © 2004 Texas Instruments, Jian Zhang <jzhang@ti.com>
* Copyright © 2004 Micron Technology Inc.
* Copyright © 2004 David Brownell
*/
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand-ecc-sw-bch.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/partitions.h>
#include <linux/omap-dma.h>
#include <linux/iopoll.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_data/elm.h>
#include <linux/omap-gpmc.h>
#include <linux/platform_data/mtd-nand-omap2.h>
#define DRIVER_NAME "omap2-nand"
#define OMAP_NAND_TIMEOUT_MS 5000
#define NAND_Ecc_P1e (1 << 0)
#define NAND_Ecc_P2e (1 << 1)
#define NAND_Ecc_P4e (1 << 2)
#define NAND_Ecc_P8e (1 << 3)
#define NAND_Ecc_P16e (1 << 4)
#define NAND_Ecc_P32e (1 << 5)
#define NAND_Ecc_P64e (1 << 6)
#define NAND_Ecc_P128e (1 << 7)
#define NAND_Ecc_P256e (1 << 8)
#define NAND_Ecc_P512e (1 << 9)
#define NAND_Ecc_P1024e (1 << 10)
#define NAND_Ecc_P2048e (1 << 11)
#define NAND_Ecc_P1o (1 << 16)
#define NAND_Ecc_P2o (1 << 17)
#define NAND_Ecc_P4o (1 << 18)
#define NAND_Ecc_P8o (1 << 19)
#define NAND_Ecc_P16o (1 << 20)
#define NAND_Ecc_P32o (1 << 21)
#define NAND_Ecc_P64o (1 << 22)
#define NAND_Ecc_P128o (1 << 23)
#define NAND_Ecc_P256o (1 << 24)
#define NAND_Ecc_P512o (1 << 25)
#define NAND_Ecc_P1024o (1 << 26)
#define NAND_Ecc_P2048o (1 << 27)
#define TF(value) (value ? 1 : 0)
#define P2048e(a) (TF(a & NAND_Ecc_P2048e) << 0)
#define P2048o(a) (TF(a & NAND_Ecc_P2048o) << 1)
#define P1e(a) (TF(a & NAND_Ecc_P1e) << 2)
#define P1o(a) (TF(a & NAND_Ecc_P1o) << 3)
#define P2e(a) (TF(a & NAND_Ecc_P2e) << 4)
#define P2o(a) (TF(a & NAND_Ecc_P2o) << 5)
#define P4e(a) (TF(a & NAND_Ecc_P4e) << 6)
#define P4o(a) (TF(a & NAND_Ecc_P4o) << 7)
#define P8e(a) (TF(a & NAND_Ecc_P8e) << 0)
#define P8o(a) (TF(a & NAND_Ecc_P8o) << 1)
#define P16e(a) (TF(a & NAND_Ecc_P16e) << 2)
#define P16o(a) (TF(a & NAND_Ecc_P16o) << 3)
#define P32e(a) (TF(a & NAND_Ecc_P32e) << 4)
#define P32o(a) (TF(a & NAND_Ecc_P32o) << 5)
#define P64e(a) (TF(a & NAND_Ecc_P64e) << 6)
#define P64o(a) (TF(a & NAND_Ecc_P64o) << 7)
#define P128e(a) (TF(a & NAND_Ecc_P128e) << 0)
#define P128o(a) (TF(a & NAND_Ecc_P128o) << 1)
#define P256e(a) (TF(a & NAND_Ecc_P256e) << 2)
#define P256o(a) (TF(a & NAND_Ecc_P256o) << 3)
#define P512e(a) (TF(a & NAND_Ecc_P512e) << 4)
#define P512o(a) (TF(a & NAND_Ecc_P512o) << 5)
#define P1024e(a) (TF(a & NAND_Ecc_P1024e) << 6)
#define P1024o(a) (TF(a & NAND_Ecc_P1024o) << 7)
#define P8e_s(a) (TF(a & NAND_Ecc_P8e) << 0)
#define P8o_s(a) (TF(a & NAND_Ecc_P8o) << 1)
#define P16e_s(a) (TF(a & NAND_Ecc_P16e) << 2)
#define P16o_s(a) (TF(a & NAND_Ecc_P16o) << 3)
#define P1e_s(a) (TF(a & NAND_Ecc_P1e) << 4)
#define P1o_s(a) (TF(a & NAND_Ecc_P1o) << 5)
#define P2e_s(a) (TF(a & NAND_Ecc_P2e) << 6)
#define P2o_s(a) (TF(a & NAND_Ecc_P2o) << 7)
#define P4e_s(a) (TF(a & NAND_Ecc_P4e) << 0)
#define P4o_s(a) (TF(a & NAND_Ecc_P4o) << 1)
#define PREFETCH_CONFIG1_CS_SHIFT 24
#define ECC_CONFIG_CS_SHIFT 1
#define CS_MASK 0x7
#define ENABLE_PREFETCH (0x1 << 7)
#define DMA_MPU_MODE_SHIFT 2
#define ECCSIZE0_SHIFT 12
#define ECCSIZE1_SHIFT 22
#define ECC1RESULTSIZE 0x1
#define ECCCLEAR 0x100
#define ECC1 0x1
#define PREFETCH_FIFOTHRESHOLD_MAX 0x40
#define PREFETCH_FIFOTHRESHOLD(val) ((val) << 8)
#define PREFETCH_STATUS_COUNT(val) (val & 0x00003fff)
#define PREFETCH_STATUS_FIFO_CNT(val) ((val >> 24) & 0x7F)
#define STATUS_BUFF_EMPTY 0x00000001
#define SECTOR_BYTES 512
/* 4 bit padding to make byte aligned, 56 = 52 + 4 */
#define BCH4_BIT_PAD 4
/* GPMC ecc engine settings for read */
#define BCH_WRAPMODE_1 1 /* BCH wrap mode 1 */
#define BCH8R_ECC_SIZE0 0x1a /* ecc_size0 = 26 */
#define BCH8R_ECC_SIZE1 0x2 /* ecc_size1 = 2 */
#define BCH4R_ECC_SIZE0 0xd /* ecc_size0 = 13 */
#define BCH4R_ECC_SIZE1 0x3 /* ecc_size1 = 3 */
/* GPMC ecc engine settings for write */
#define BCH_WRAPMODE_6 6 /* BCH wrap mode 6 */
#define BCH_ECC_SIZE0 0x0 /* ecc_size0 = 0, no oob protection */
#define BCH_ECC_SIZE1 0x20 /* ecc_size1 = 32 */
#define BBM_LEN 2
static u_char bch16_vector[] = {0xf5, 0x24, 0x1c, 0xd0, 0x61, 0xb3, 0xf1, 0x55,
0x2e, 0x2c, 0x86, 0xa3, 0xed, 0x36, 0x1b, 0x78,
0x48, 0x76, 0xa9, 0x3b, 0x97, 0xd1, 0x7a, 0x93,
0x07, 0x0e};
static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc,
0xac, 0x6b, 0xff, 0x99, 0x7b};
static u_char bch4_vector[] = {0x00, 0x6b, 0x31, 0xdd, 0x41, 0xbc, 0x10};
struct omap_nand_info {
struct nand_chip nand;
struct platform_device *pdev;
int gpmc_cs;
bool dev_ready;
enum nand_io xfer_type;
enum omap_ecc ecc_opt;
struct device_node *elm_of_node;
unsigned long phys_base;
struct completion comp;
struct dma_chan *dma;
int gpmc_irq_fifo;
int gpmc_irq_count;
enum {
OMAP_NAND_IO_READ = 0, /* read */
OMAP_NAND_IO_WRITE, /* write */
} iomode;
u_char *buf;
int buf_len;
/* Interface to GPMC */
void __iomem *fifo;
struct gpmc_nand_regs reg;
struct gpmc_nand_ops *ops;
bool flash_bbt;
/* fields specific for BCHx_HW ECC scheme */
struct device *elm_dev;
/* NAND ready gpio */
struct gpio_desc *ready_gpiod;
unsigned int neccpg;
unsigned int nsteps_per_eccpg;
unsigned int eccpg_size;
unsigned int eccpg_bytes;
void (*data_in)(struct nand_chip *chip, void *buf,
unsigned int len, bool force_8bit);
void (*data_out)(struct nand_chip *chip,
const void *buf, unsigned int len,
bool force_8bit);
};
static inline struct omap_nand_info *mtd_to_omap(struct mtd_info *mtd)
{
return container_of(mtd_to_nand(mtd), struct omap_nand_info, nand);
}
static void omap_nand_data_in(struct nand_chip *chip, void *buf,
unsigned int len, bool force_8bit);
static void omap_nand_data_out(struct nand_chip *chip,
const void *buf, unsigned int len,
bool force_8bit);
/**
* omap_prefetch_enable - configures and starts prefetch transfer
* @cs: cs (chip select) number
* @fifo_th: fifo threshold to be used for read/ write
* @dma_mode: dma mode enable (1) or disable (0)
* @u32_count: number of bytes to be transferred
* @is_write: prefetch read(0) or write post(1) mode
* @info: NAND device structure containing platform data
*/
static int omap_prefetch_enable(int cs, int fifo_th, int dma_mode,
unsigned int u32_count, int is_write, struct omap_nand_info *info)
{
u32 val;
if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX)
return -1;
if (readl(info->reg.gpmc_prefetch_control))
return -EBUSY;
/* Set the amount of bytes to be prefetched */
writel(u32_count, info->reg.gpmc_prefetch_config2);
/* Set dma/mpu mode, the prefetch read / post write and
* enable the engine. Set which cs is has requested for.
*/
val = ((cs << PREFETCH_CONFIG1_CS_SHIFT) |
PREFETCH_FIFOTHRESHOLD(fifo_th) | ENABLE_PREFETCH |
(dma_mode << DMA_MPU_MODE_SHIFT) | (is_write & 0x1));
writel(val, info->reg.gpmc_prefetch_config1);
/* Start the prefetch engine */
writel(0x1, info->reg.gpmc_prefetch_control);
return 0;
}
/*
* omap_prefetch_reset - disables and stops the prefetch engine
*/
static int omap_prefetch_reset(int cs, struct omap_nand_info *info)
{
u32 config1;
/* check if the same module/cs is trying to reset */
config1 = readl(info->reg.gpmc_prefetch_config1);
if (((config1 >> PREFETCH_CONFIG1_CS_SHIFT) & CS_MASK) != cs)
return -EINVAL;
/* Stop the PFPW engine */
writel(0x0, info->reg.gpmc_prefetch_control);
/* Reset/disable the PFPW engine */
writel(0x0, info->reg.gpmc_prefetch_config1);
return 0;
}
/**
* omap_nand_data_in_pref - NAND data in using prefetch engine
*/
static void omap_nand_data_in_pref(struct nand_chip *chip, void *buf,
unsigned int len, bool force_8bit)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
uint32_t r_count = 0;
int ret = 0;
u32 *p = (u32 *)buf;
unsigned int pref_len;
if (force_8bit) {
omap_nand_data_in(chip, buf, len, force_8bit);
return;
}
/* read 32-bit words using prefetch and remaining bytes normally */
/* configure and start prefetch transfer */
pref_len = len - (len & 3);
ret = omap_prefetch_enable(info->gpmc_cs,
PREFETCH_FIFOTHRESHOLD_MAX, 0x0, pref_len, 0x0, info);
if (ret) {
/* prefetch engine is busy, use CPU copy method */
omap_nand_data_in(chip, buf, len, false);
} else {
do {
r_count = readl(info->reg.gpmc_prefetch_status);
r_count = PREFETCH_STATUS_FIFO_CNT(r_count);
r_count = r_count >> 2;
ioread32_rep(info->fifo, p, r_count);
p += r_count;
pref_len -= r_count << 2;
} while (pref_len);
/* disable and stop the Prefetch engine */
omap_prefetch_reset(info->gpmc_cs, info);
/* fetch any remaining bytes */
if (len & 3)
omap_nand_data_in(chip, p, len & 3, false);
}
}
/**
* omap_nand_data_out_pref - NAND data out using Write Posting engine
*/
static void omap_nand_data_out_pref(struct nand_chip *chip,
const void *buf, unsigned int len,
bool force_8bit)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
uint32_t w_count = 0;
int i = 0, ret = 0;
u16 *p = (u16 *)buf;
unsigned long tim, limit;
u32 val;
if (force_8bit) {
omap_nand_data_out(chip, buf, len, force_8bit);
return;
}
/* take care of subpage writes */
if (len % 2 != 0) {
writeb(*(u8 *)buf, info->fifo);
p = (u16 *)(buf + 1);
len--;
}
/* configure and start prefetch transfer */
ret = omap_prefetch_enable(info->gpmc_cs,
PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1, info);
if (ret) {
/* write posting engine is busy, use CPU copy method */
omap_nand_data_out(chip, buf, len, false);
} else {
while (len) {
w_count = readl(info->reg.gpmc_prefetch_status);
w_count = PREFETCH_STATUS_FIFO_CNT(w_count);
w_count = w_count >> 1;
for (i = 0; (i < w_count) && len; i++, len -= 2)
iowrite16(*p++, info->fifo);
}
/* wait for data to flushed-out before reset the prefetch */
tim = 0;
limit = (loops_per_jiffy *
msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
do {
cpu_relax();
val = readl(info->reg.gpmc_prefetch_status);
val = PREFETCH_STATUS_COUNT(val);
} while (val && (tim++ < limit));
/* disable and stop the PFPW engine */
omap_prefetch_reset(info->gpmc_cs, info);
}
}
/*
* omap_nand_dma_callback: callback on the completion of dma transfer
* @data: pointer to completion data structure
*/
static void omap_nand_dma_callback(void *data)
{
complete((struct completion *) data);
}
/*
* omap_nand_dma_transfer: configure and start dma transfer
* @chip: nand chip structure
* @addr: virtual address in RAM of source/destination
* @len: number of data bytes to be transferred
* @is_write: flag for read/write operation
*/
static inline int omap_nand_dma_transfer(struct nand_chip *chip,
const void *addr, unsigned int len,
int is_write)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
struct dma_async_tx_descriptor *tx;
enum dma_data_direction dir = is_write ? DMA_TO_DEVICE :
DMA_FROM_DEVICE;
struct scatterlist sg;
unsigned long tim, limit;
unsigned n;
int ret;
u32 val;
if (!virt_addr_valid(addr))
goto out_copy;
sg_init_one(&sg, addr, len);
n = dma_map_sg(info->dma->device->dev, &sg, 1, dir);
if (n == 0) {
dev_err(&info->pdev->dev,
"Couldn't DMA map a %d byte buffer\n", len);
goto out_copy;
}
tx = dmaengine_prep_slave_sg(info->dma, &sg, n,
is_write ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!tx)
goto out_copy_unmap;
tx->callback = omap_nand_dma_callback;
tx->callback_param = &info->comp;
dmaengine_submit(tx);
init_completion(&info->comp);
/* setup and start DMA using dma_addr */
dma_async_issue_pending(info->dma);
/* configure and start prefetch transfer */
ret = omap_prefetch_enable(info->gpmc_cs,
PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write, info);
if (ret)
/* PFPW engine is busy, use cpu copy method */
goto out_copy_unmap;
wait_for_completion(&info->comp);
tim = 0;
limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
do {
cpu_relax();
val = readl(info->reg.gpmc_prefetch_status);
val = PREFETCH_STATUS_COUNT(val);
} while (val && (tim++ < limit));
/* disable and stop the PFPW engine */
omap_prefetch_reset(info->gpmc_cs, info);
dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
return 0;
out_copy_unmap:
dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
out_copy:
is_write == 0 ? omap_nand_data_in(chip, (void *)addr, len, false)
: omap_nand_data_out(chip, addr, len, false);
return 0;
}
/**
* omap_nand_data_in_dma_pref - NAND data in using DMA and Prefetch
*/
static void omap_nand_data_in_dma_pref(struct nand_chip *chip, void *buf,
unsigned int len, bool force_8bit)
{
struct mtd_info *mtd = nand_to_mtd(chip);
if (force_8bit) {
omap_nand_data_in(chip, buf, len, force_8bit);
return;
}
if (len <= mtd->oobsize)
omap_nand_data_in_pref(chip, buf, len, false);
else
/* start transfer in DMA mode */
omap_nand_dma_transfer(chip, buf, len, 0x0);
}
/**
* omap_nand_data_out_dma_pref - NAND data out using DMA and write posting
*/
static void omap_nand_data_out_dma_pref(struct nand_chip *chip,
const void *buf, unsigned int len,
bool force_8bit)
{
struct mtd_info *mtd = nand_to_mtd(chip);
if (force_8bit) {
omap_nand_data_out(chip, buf, len, force_8bit);
return;
}
if (len <= mtd->oobsize)
omap_nand_data_out_pref(chip, buf, len, false);
else
/* start transfer in DMA mode */
omap_nand_dma_transfer(chip, buf, len, 0x1);
}
/*
* omap_nand_irq - GPMC irq handler
* @this_irq: gpmc irq number
* @dev: omap_nand_info structure pointer is passed here
*/
static irqreturn_t omap_nand_irq(int this_irq, void *dev)
{
struct omap_nand_info *info = (struct omap_nand_info *) dev;
u32 bytes;
bytes = readl(info->reg.gpmc_prefetch_status);
bytes = PREFETCH_STATUS_FIFO_CNT(bytes);
bytes = bytes & 0xFFFC; /* io in multiple of 4 bytes */
if (info->iomode == OMAP_NAND_IO_WRITE) { /* checks for write io */
if (this_irq == info->gpmc_irq_count)
goto done;
if (info->buf_len && (info->buf_len < bytes))
bytes = info->buf_len;
else if (!info->buf_len)
bytes = 0;
iowrite32_rep(info->fifo, (u32 *)info->buf,
bytes >> 2);
info->buf = info->buf + bytes;
info->buf_len -= bytes;
} else {
ioread32_rep(info->fifo, (u32 *)info->buf,
bytes >> 2);
info->buf = info->buf + bytes;
if (this_irq == info->gpmc_irq_count)
goto done;
}
return IRQ_HANDLED;
done:
complete(&info->comp);
disable_irq_nosync(info->gpmc_irq_fifo);
disable_irq_nosync(info->gpmc_irq_count);
return IRQ_HANDLED;
}
/*
* omap_nand_data_in_irq_pref - NAND data in using Prefetch and IRQ
*/
static void omap_nand_data_in_irq_pref(struct nand_chip *chip, void *buf,
unsigned int len, bool force_8bit)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
struct mtd_info *mtd = nand_to_mtd(&info->nand);
int ret = 0;
if (len <= mtd->oobsize || force_8bit) {
omap_nand_data_in(chip, buf, len, force_8bit);
return;
}
info->iomode = OMAP_NAND_IO_READ;
info->buf = buf;
init_completion(&info->comp);
/* configure and start prefetch transfer */
ret = omap_prefetch_enable(info->gpmc_cs,
PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0, info);
if (ret) {
/* PFPW engine is busy, use cpu copy method */
omap_nand_data_in(chip, buf, len, false);
return;
}
info->buf_len = len;
enable_irq(info->gpmc_irq_count);
enable_irq(info->gpmc_irq_fifo);
/* waiting for read to complete */
wait_for_completion(&info->comp);
/* disable and stop the PFPW engine */
omap_prefetch_reset(info->gpmc_cs, info);
return;
}
/*
* omap_nand_data_out_irq_pref - NAND out using write posting and IRQ
*/
static void omap_nand_data_out_irq_pref(struct nand_chip *chip,
const void *buf, unsigned int len,
bool force_8bit)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
struct mtd_info *mtd = nand_to_mtd(&info->nand);
int ret = 0;
unsigned long tim, limit;
u32 val;
if (len <= mtd->oobsize || force_8bit) {
omap_nand_data_out(chip, buf, len, force_8bit);
return;
}
info->iomode = OMAP_NAND_IO_WRITE;
info->buf = (u_char *) buf;
init_completion(&info->comp);
/* configure and start prefetch transfer : size=24 */
ret = omap_prefetch_enable(info->gpmc_cs,
(PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1, info);
if (ret) {
/* PFPW engine is busy, use cpu copy method */
omap_nand_data_out(chip, buf, len, false);
return;
}
info->buf_len = len;
enable_irq(info->gpmc_irq_count);
enable_irq(info->gpmc_irq_fifo);
/* waiting for write to complete */
wait_for_completion(&info->comp);
/* wait for data to flushed-out before reset the prefetch */
tim = 0;
limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
do {
val = readl(info->reg.gpmc_prefetch_status);
val = PREFETCH_STATUS_COUNT(val);
cpu_relax();
} while (val && (tim++ < limit));
/* disable and stop the PFPW engine */
omap_prefetch_reset(info->gpmc_cs, info);
return;
}
/**
* gen_true_ecc - This function will generate true ECC value
* @ecc_buf: buffer to store ecc code
*
* This generated true ECC value can be used when correcting
* data read from NAND flash memory core
*/
static void gen_true_ecc(u8 *ecc_buf)
{
u32 tmp = ecc_buf[0] | (ecc_buf[1] << 16) |
((ecc_buf[2] & 0xF0) << 20) | ((ecc_buf[2] & 0x0F) << 8);
ecc_buf[0] = ~(P64o(tmp) | P64e(tmp) | P32o(tmp) | P32e(tmp) |
P16o(tmp) | P16e(tmp) | P8o(tmp) | P8e(tmp));
ecc_buf[1] = ~(P1024o(tmp) | P1024e(tmp) | P512o(tmp) | P512e(tmp) |
P256o(tmp) | P256e(tmp) | P128o(tmp) | P128e(tmp));
ecc_buf[2] = ~(P4o(tmp) | P4e(tmp) | P2o(tmp) | P2e(tmp) | P1o(tmp) |
P1e(tmp) | P2048o(tmp) | P2048e(tmp));
}
/**
* omap_compare_ecc - Detect (2 bits) and correct (1 bit) error in data
* @ecc_data1: ecc code from nand spare area
* @ecc_data2: ecc code from hardware register obtained from hardware ecc
* @page_data: page data
*
* This function compares two ECC's and indicates if there is an error.
* If the error can be corrected it will be corrected to the buffer.
* If there is no error, %0 is returned. If there is an error but it
* was corrected, %1 is returned. Otherwise, %-1 is returned.
*/
static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */
u8 *ecc_data2, /* read from register */
u8 *page_data)
{
uint i;
u8 tmp0_bit[8], tmp1_bit[8], tmp2_bit[8];
u8 comp0_bit[8], comp1_bit[8], comp2_bit[8];
u8 ecc_bit[24];
u8 ecc_sum = 0;
u8 find_bit = 0;
uint find_byte = 0;
int isEccFF;
isEccFF = ((*(u32 *)ecc_data1 & 0xFFFFFF) == 0xFFFFFF);
gen_true_ecc(ecc_data1);
gen_true_ecc(ecc_data2);
for (i = 0; i <= 2; i++) {
*(ecc_data1 + i) = ~(*(ecc_data1 + i));
*(ecc_data2 + i) = ~(*(ecc_data2 + i));
}
for (i = 0; i < 8; i++) {
tmp0_bit[i] = *ecc_data1 % 2;
*ecc_data1 = *ecc_data1 / 2;
}
for (i = 0; i < 8; i++) {
tmp1_bit[i] = *(ecc_data1 + 1) % 2;
*(ecc_data1 + 1) = *(ecc_data1 + 1) / 2;
}
for (i = 0; i < 8; i++) {
tmp2_bit[i] = *(ecc_data1 + 2) % 2;
*(ecc_data1 + 2) = *(ecc_data1 + 2) / 2;
}
for (i = 0; i < 8; i++) {
comp0_bit[i] = *ecc_data2 % 2;
*ecc_data2 = *ecc_data2 / 2;
}
for (i = 0; i < 8; i++) {
comp1_bit[i] = *(ecc_data2 + 1) % 2;
*(ecc_data2 + 1) = *(ecc_data2 + 1) / 2;
}
for (i = 0; i < 8; i++) {
comp2_bit[i] = *(ecc_data2 + 2) % 2;
*(ecc_data2 + 2) = *(ecc_data2 + 2) / 2;
}
for (i = 0; i < 6; i++)
ecc_bit[i] = tmp2_bit[i + 2] ^ comp2_bit[i + 2];
for (i = 0; i < 8; i++)
ecc_bit[i + 6] = tmp0_bit[i] ^ comp0_bit[i];
for (i = 0; i < 8; i++)
ecc_bit[i + 14] = tmp1_bit[i] ^ comp1_bit[i];
ecc_bit[22] = tmp2_bit[0] ^ comp2_bit[0];
ecc_bit[23] = tmp2_bit[1] ^ comp2_bit[1];
for (i = 0; i < 24; i++)
ecc_sum += ecc_bit[i];
switch (ecc_sum) {
case 0:
/* Not reached because this function is not called if
* ECC values are equal
*/
return 0;
case 1:
/* Uncorrectable error */
pr_debug("ECC UNCORRECTED_ERROR 1\n");
return -EBADMSG;
case 11:
/* UN-Correctable error */
pr_debug("ECC UNCORRECTED_ERROR B\n");
return -EBADMSG;
case 12:
/* Correctable error */
find_byte = (ecc_bit[23] << 8) +
(ecc_bit[21] << 7) +
(ecc_bit[19] << 6) +
(ecc_bit[17] << 5) +
(ecc_bit[15] << 4) +
(ecc_bit[13] << 3) +
(ecc_bit[11] << 2) +
(ecc_bit[9] << 1) +
ecc_bit[7];
find_bit = (ecc_bit[5] << 2) + (ecc_bit[3] << 1) + ecc_bit[1];
pr_debug("Correcting single bit ECC error at offset: "
"%d, bit: %d\n", find_byte, find_bit);
page_data[find_byte] ^= (1 << find_bit);
return 1;
default:
if (isEccFF) {
if (ecc_data2[0] == 0 &&
ecc_data2[1] == 0 &&
ecc_data2[2] == 0)
return 0;
}
pr_debug("UNCORRECTED_ERROR default\n");
return -EBADMSG;
}
}
/**
* omap_correct_data - Compares the ECC read with HW generated ECC
* @chip: NAND chip object
* @dat: page data
* @read_ecc: ecc read from nand flash
* @calc_ecc: ecc read from HW ECC registers
*
* Compares the ecc read from nand spare area with ECC registers values
* and if ECC's mismatched, it will call 'omap_compare_ecc' for error
* detection and correction. If there are no errors, %0 is returned. If
* there were errors and all of the errors were corrected, the number of
* corrected errors is returned. If uncorrectable errors exist, %-1 is
* returned.
*/
static int omap_correct_data(struct nand_chip *chip, u_char *dat,
u_char *read_ecc, u_char *calc_ecc)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
int blockCnt = 0, i = 0, ret = 0;
int stat = 0;
/* Ex NAND_ECC_HW12_2048 */
if (info->nand.ecc.engine_type == NAND_ECC_ENGINE_TYPE_ON_HOST &&
info->nand.ecc.size == 2048)
blockCnt = 4;
else
blockCnt = 1;
for (i = 0; i < blockCnt; i++) {
if (memcmp(read_ecc, calc_ecc, 3) != 0) {
ret = omap_compare_ecc(read_ecc, calc_ecc, dat);
if (ret < 0)
return ret;
/* keep track of the number of corrected errors */
stat += ret;
}
read_ecc += 3;
calc_ecc += 3;
dat += 512;
}
return stat;
}
/**
* omap_calculate_ecc - Generate non-inverted ECC bytes.
* @chip: NAND chip object
* @dat: The pointer to data on which ecc is computed
* @ecc_code: The ecc_code buffer
*
* Using noninverted ECC can be considered ugly since writing a blank
* page ie. padding will clear the ECC bytes. This is no problem as long
* nobody is trying to write data on the seemingly unused page. Reading
* an erased page will produce an ECC mismatch between generated and read
* ECC bytes that has to be dealt with separately.
*/
static int omap_calculate_ecc(struct nand_chip *chip, const u_char *dat,
u_char *ecc_code)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
u32 val;
val = readl(info->reg.gpmc_ecc_config);
if (((val >> ECC_CONFIG_CS_SHIFT) & CS_MASK) != info->gpmc_cs)
return -EINVAL;
/* read ecc result */
val = readl(info->reg.gpmc_ecc1_result);
*ecc_code++ = val; /* P128e, ..., P1e */
*ecc_code++ = val >> 16; /* P128o, ..., P1o */
/* P2048o, P1024o, P512o, P256o, P2048e, P1024e, P512e, P256e */
*ecc_code++ = ((val >> 8) & 0x0f) | ((val >> 20) & 0xf0);
return 0;
}
/**
* omap_enable_hwecc - This function enables the hardware ecc functionality
* @chip: NAND chip object
* @mode: Read/Write mode
*/
static void omap_enable_hwecc(struct nand_chip *chip, int mode)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
u32 val;
/* clear ecc and enable bits */
val = ECCCLEAR | ECC1;
writel(val, info->reg.gpmc_ecc_control);
/* program ecc and result sizes */
val = ((((info->nand.ecc.size >> 1) - 1) << ECCSIZE1_SHIFT) |
ECC1RESULTSIZE);
writel(val, info->reg.gpmc_ecc_size_config);
switch (mode) {
case NAND_ECC_READ:
case NAND_ECC_WRITE:
writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control);
break;
case NAND_ECC_READSYN:
writel(ECCCLEAR, info->reg.gpmc_ecc_control);
break;
default:
dev_info(&info->pdev->dev,
"error: unrecognized Mode[%d]!\n", mode);
break;
}
/* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1);
writel(val, info->reg.gpmc_ecc_config);
}
/**
* omap_enable_hwecc_bch - Program GPMC to perform BCH ECC calculation
* @chip: NAND chip object
* @mode: Read/Write mode
*
* When using BCH with SW correction (i.e. no ELM), sector size is set
* to 512 bytes and we use BCH_WRAPMODE_6 wrapping mode
* for both reading and writing with:
* eccsize0 = 0 (no additional protected byte in spare area)
* eccsize1 = 32 (skip 32 nibbles = 16 bytes per sector in spare area)
*/
static void __maybe_unused omap_enable_hwecc_bch(struct nand_chip *chip,
int mode)
{
unsigned int bch_type;
unsigned int dev_width, nsectors;
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
enum omap_ecc ecc_opt = info->ecc_opt;
u32 val, wr_mode;
unsigned int ecc_size1, ecc_size0;
/* GPMC configurations for calculating ECC */
switch (ecc_opt) {
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
bch_type = 0;
nsectors = 1;
wr_mode = BCH_WRAPMODE_6;
ecc_size0 = BCH_ECC_SIZE0;
ecc_size1 = BCH_ECC_SIZE1;
break;
case OMAP_ECC_BCH4_CODE_HW:
bch_type = 0;
nsectors = chip->ecc.steps;
if (mode == NAND_ECC_READ) {
wr_mode = BCH_WRAPMODE_1;
ecc_size0 = BCH4R_ECC_SIZE0;
ecc_size1 = BCH4R_ECC_SIZE1;
} else {
wr_mode = BCH_WRAPMODE_6;
ecc_size0 = BCH_ECC_SIZE0;
ecc_size1 = BCH_ECC_SIZE1;
}
break;
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
bch_type = 1;
nsectors = 1;
wr_mode = BCH_WRAPMODE_6;
ecc_size0 = BCH_ECC_SIZE0;
ecc_size1 = BCH_ECC_SIZE1;
break;
case OMAP_ECC_BCH8_CODE_HW:
bch_type = 1;
nsectors = chip->ecc.steps;
if (mode == NAND_ECC_READ) {
wr_mode = BCH_WRAPMODE_1;
ecc_size0 = BCH8R_ECC_SIZE0;
ecc_size1 = BCH8R_ECC_SIZE1;
} else {
wr_mode = BCH_WRAPMODE_6;
ecc_size0 = BCH_ECC_SIZE0;
ecc_size1 = BCH_ECC_SIZE1;
}
break;
case OMAP_ECC_BCH16_CODE_HW:
bch_type = 0x2;
nsectors = chip->ecc.steps;
if (mode == NAND_ECC_READ) {
wr_mode = 0x01;
ecc_size0 = 52; /* ECC bits in nibbles per sector */
ecc_size1 = 0; /* non-ECC bits in nibbles per sector */
} else {
wr_mode = 0x01;
ecc_size0 = 0; /* extra bits in nibbles per sector */
ecc_size1 = 52; /* OOB bits in nibbles per sector */
}
break;
default:
return;
}
writel(ECC1, info->reg.gpmc_ecc_control);
/* Configure ecc size for BCH */
val = (ecc_size1 << ECCSIZE1_SHIFT) | (ecc_size0 << ECCSIZE0_SHIFT);
writel(val, info->reg.gpmc_ecc_size_config);
dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
/* BCH configuration */
val = ((1 << 16) | /* enable BCH */
(bch_type << 12) | /* BCH4/BCH8/BCH16 */
(wr_mode << 8) | /* wrap mode */
(dev_width << 7) | /* bus width */
(((nsectors-1) & 0x7) << 4) | /* number of sectors */
(info->gpmc_cs << 1) | /* ECC CS */
(0x1)); /* enable ECC */
writel(val, info->reg.gpmc_ecc_config);
/* Clear ecc and enable bits */
writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control);
}
static u8 bch4_polynomial[] = {0x28, 0x13, 0xcc, 0x39, 0x96, 0xac, 0x7f};
static u8 bch8_polynomial[] = {0xef, 0x51, 0x2e, 0x09, 0xed, 0x93, 0x9a, 0xc2,
0x97, 0x79, 0xe5, 0x24, 0xb5};
/**
* _omap_calculate_ecc_bch - Generate ECC bytes for one sector
* @mtd: MTD device structure
* @dat: The pointer to data on which ecc is computed
* @ecc_calc: The ecc_code buffer
* @i: The sector number (for a multi sector page)
*
* Support calculating of BCH4/8/16 ECC vectors for one sector
* within a page. Sector number is in @i.
*/
static int _omap_calculate_ecc_bch(struct mtd_info *mtd,
const u_char *dat, u_char *ecc_calc, int i)
{
struct omap_nand_info *info = mtd_to_omap(mtd);
int eccbytes = info->nand.ecc.bytes;
struct gpmc_nand_regs *gpmc_regs = &info->reg;
u8 *ecc_code;
unsigned long bch_val1, bch_val2, bch_val3, bch_val4;
u32 val;
int j;
ecc_code = ecc_calc;
switch (info->ecc_opt) {
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
case OMAP_ECC_BCH8_CODE_HW:
bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]);
bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]);
bch_val3 = readl(gpmc_regs->gpmc_bch_result2[i]);
bch_val4 = readl(gpmc_regs->gpmc_bch_result3[i]);
*ecc_code++ = (bch_val4 & 0xFF);
*ecc_code++ = ((bch_val3 >> 24) & 0xFF);
*ecc_code++ = ((bch_val3 >> 16) & 0xFF);
*ecc_code++ = ((bch_val3 >> 8) & 0xFF);
*ecc_code++ = (bch_val3 & 0xFF);
*ecc_code++ = ((bch_val2 >> 24) & 0xFF);
*ecc_code++ = ((bch_val2 >> 16) & 0xFF);
*ecc_code++ = ((bch_val2 >> 8) & 0xFF);
*ecc_code++ = (bch_val2 & 0xFF);
*ecc_code++ = ((bch_val1 >> 24) & 0xFF);
*ecc_code++ = ((bch_val1 >> 16) & 0xFF);
*ecc_code++ = ((bch_val1 >> 8) & 0xFF);
*ecc_code++ = (bch_val1 & 0xFF);
break;
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
case OMAP_ECC_BCH4_CODE_HW:
bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]);
bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]);
*ecc_code++ = ((bch_val2 >> 12) & 0xFF);
*ecc_code++ = ((bch_val2 >> 4) & 0xFF);
*ecc_code++ = ((bch_val2 & 0xF) << 4) |
((bch_val1 >> 28) & 0xF);
*ecc_code++ = ((bch_val1 >> 20) & 0xFF);
*ecc_code++ = ((bch_val1 >> 12) & 0xFF);
*ecc_code++ = ((bch_val1 >> 4) & 0xFF);
*ecc_code++ = ((bch_val1 & 0xF) << 4);
break;
case OMAP_ECC_BCH16_CODE_HW:
val = readl(gpmc_regs->gpmc_bch_result6[i]);
ecc_code[0] = ((val >> 8) & 0xFF);
ecc_code[1] = ((val >> 0) & 0xFF);
val = readl(gpmc_regs->gpmc_bch_result5[i]);
ecc_code[2] = ((val >> 24) & 0xFF);
ecc_code[3] = ((val >> 16) & 0xFF);
ecc_code[4] = ((val >> 8) & 0xFF);
ecc_code[5] = ((val >> 0) & 0xFF);
val = readl(gpmc_regs->gpmc_bch_result4[i]);
ecc_code[6] = ((val >> 24) & 0xFF);
ecc_code[7] = ((val >> 16) & 0xFF);
ecc_code[8] = ((val >> 8) & 0xFF);
ecc_code[9] = ((val >> 0) & 0xFF);
val = readl(gpmc_regs->gpmc_bch_result3[i]);
ecc_code[10] = ((val >> 24) & 0xFF);
ecc_code[11] = ((val >> 16) & 0xFF);
ecc_code[12] = ((val >> 8) & 0xFF);
ecc_code[13] = ((val >> 0) & 0xFF);
val = readl(gpmc_regs->gpmc_bch_result2[i]);
ecc_code[14] = ((val >> 24) & 0xFF);
ecc_code[15] = ((val >> 16) & 0xFF);
ecc_code[16] = ((val >> 8) & 0xFF);
ecc_code[17] = ((val >> 0) & 0xFF);
val = readl(gpmc_regs->gpmc_bch_result1[i]);
ecc_code[18] = ((val >> 24) & 0xFF);
ecc_code[19] = ((val >> 16) & 0xFF);
ecc_code[20] = ((val >> 8) & 0xFF);
ecc_code[21] = ((val >> 0) & 0xFF);
val = readl(gpmc_regs->gpmc_bch_result0[i]);
ecc_code[22] = ((val >> 24) & 0xFF);
ecc_code[23] = ((val >> 16) & 0xFF);
ecc_code[24] = ((val >> 8) & 0xFF);
ecc_code[25] = ((val >> 0) & 0xFF);
break;
default:
return -EINVAL;
}
/* ECC scheme specific syndrome customizations */
switch (info->ecc_opt) {
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
/* Add constant polynomial to remainder, so that
* ECC of blank pages results in 0x0 on reading back
*/
for (j = 0; j < eccbytes; j++)
ecc_calc[j] ^= bch4_polynomial[j];
break;
case OMAP_ECC_BCH4_CODE_HW:
/* Set 8th ECC byte as 0x0 for ROM compatibility */
ecc_calc[eccbytes - 1] = 0x0;
break;
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
/* Add constant polynomial to remainder, so that
* ECC of blank pages results in 0x0 on reading back
*/
for (j = 0; j < eccbytes; j++)
ecc_calc[j] ^= bch8_polynomial[j];
break;
case OMAP_ECC_BCH8_CODE_HW:
/* Set 14th ECC byte as 0x0 for ROM compatibility */
ecc_calc[eccbytes - 1] = 0x0;
break;
case OMAP_ECC_BCH16_CODE_HW:
break;
default:
return -EINVAL;
}
return 0;
}
/**
* omap_calculate_ecc_bch_sw - ECC generator for sector for SW based correction
* @chip: NAND chip object
* @dat: The pointer to data on which ecc is computed
* @ecc_calc: Buffer storing the calculated ECC bytes
*
* Support calculating of BCH4/8/16 ECC vectors for one sector. This is used
* when SW based correction is required as ECC is required for one sector
* at a time.
*/
static int omap_calculate_ecc_bch_sw(struct nand_chip *chip,
const u_char *dat, u_char *ecc_calc)
{
return _omap_calculate_ecc_bch(nand_to_mtd(chip), dat, ecc_calc, 0);
}
/**
* omap_calculate_ecc_bch_multi - Generate ECC for multiple sectors
* @mtd: MTD device structure
* @dat: The pointer to data on which ecc is computed
* @ecc_calc: Buffer storing the calculated ECC bytes
*
* Support calculating of BCH4/8/16 ecc vectors for the entire page in one go.
*/
static int omap_calculate_ecc_bch_multi(struct mtd_info *mtd,
const u_char *dat, u_char *ecc_calc)
{
struct omap_nand_info *info = mtd_to_omap(mtd);
int eccbytes = info->nand.ecc.bytes;
unsigned long nsectors;
int i, ret;
nsectors = ((readl(info->reg.gpmc_ecc_config) >> 4) & 0x7) + 1;
for (i = 0; i < nsectors; i++) {
ret = _omap_calculate_ecc_bch(mtd, dat, ecc_calc, i);
if (ret)
return ret;
ecc_calc += eccbytes;
}
return 0;
}
/**
* erased_sector_bitflips - count bit flips
* @data: data sector buffer
* @oob: oob buffer
* @info: omap_nand_info
*
* Check the bit flips in erased page falls below correctable level.
* If falls below, report the page as erased with correctable bit
* flip, else report as uncorrectable page.
*/
static int erased_sector_bitflips(u_char *data, u_char *oob,
struct omap_nand_info *info)
{
int flip_bits = 0, i;
for (i = 0; i < info->nand.ecc.size; i++) {
flip_bits += hweight8(~data[i]);
if (flip_bits > info->nand.ecc.strength)
return 0;
}
for (i = 0; i < info->nand.ecc.bytes - 1; i++) {
flip_bits += hweight8(~oob[i]);
if (flip_bits > info->nand.ecc.strength)
return 0;
}
/*
* Bit flips falls in correctable level.
* Fill data area with 0xFF
*/
if (flip_bits) {
memset(data, 0xFF, info->nand.ecc.size);
memset(oob, 0xFF, info->nand.ecc.bytes);
}
return flip_bits;
}
/**
* omap_elm_correct_data - corrects page data area in case error reported
* @chip: NAND chip object
* @data: page data
* @read_ecc: ecc read from nand flash
* @calc_ecc: ecc read from HW ECC registers
*
* Calculated ecc vector reported as zero in case of non-error pages.
* In case of non-zero ecc vector, first filter out erased-pages, and
* then process data via ELM to detect bit-flips.
*/
static int omap_elm_correct_data(struct nand_chip *chip, u_char *data,
u_char *read_ecc, u_char *calc_ecc)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
struct nand_ecc_ctrl *ecc = &info->nand.ecc;
int eccsteps = info->nsteps_per_eccpg;
int i , j, stat = 0;
int eccflag, actual_eccbytes;
struct elm_errorvec err_vec[ERROR_VECTOR_MAX];
u_char *ecc_vec = calc_ecc;
u_char *spare_ecc = read_ecc;
u_char *erased_ecc_vec;
u_char *buf;
int bitflip_count;
bool is_error_reported = false;
u32 bit_pos, byte_pos, error_max, pos;
int err;
switch (info->ecc_opt) {
case OMAP_ECC_BCH4_CODE_HW:
/* omit 7th ECC byte reserved for ROM code compatibility */
actual_eccbytes = ecc->bytes - 1;
erased_ecc_vec = bch4_vector;
break;
case OMAP_ECC_BCH8_CODE_HW:
/* omit 14th ECC byte reserved for ROM code compatibility */
actual_eccbytes = ecc->bytes - 1;
erased_ecc_vec = bch8_vector;
break;
case OMAP_ECC_BCH16_CODE_HW:
actual_eccbytes = ecc->bytes;
erased_ecc_vec = bch16_vector;
break;
default:
dev_err(&info->pdev->dev, "invalid driver configuration\n");
return -EINVAL;
}
/* Initialize elm error vector to zero */
memset(err_vec, 0, sizeof(err_vec));
for (i = 0; i < eccsteps ; i++) {
eccflag = 0; /* initialize eccflag */
/*
* Check any error reported,
* In case of error, non zero ecc reported.
*/
for (j = 0; j < actual_eccbytes; j++) {
if (calc_ecc[j] != 0) {
eccflag = 1; /* non zero ecc, error present */
break;
}
}
if (eccflag == 1) {
if (memcmp(calc_ecc, erased_ecc_vec,
actual_eccbytes) == 0) {
/*
* calc_ecc[] matches pattern for ECC(all 0xff)
* so this is definitely an erased-page
*/
} else {
buf = &data[info->nand.ecc.size * i];
/*
* count number of 0-bits in read_buf.
* This check can be removed once a similar
* check is introduced in generic NAND driver
*/
bitflip_count = erased_sector_bitflips(
buf, read_ecc, info);
if (bitflip_count) {
/*
* number of 0-bits within ECC limits
* So this may be an erased-page
*/
stat += bitflip_count;
} else {
/*
* Too many 0-bits. It may be a
* - programmed-page, OR
* - erased-page with many bit-flips
* So this page requires check by ELM
*/
err_vec[i].error_reported = true;
is_error_reported = true;
}
}
}
/* Update the ecc vector */
calc_ecc += ecc->bytes;
read_ecc += ecc->bytes;
}
/* Check if any error reported */
if (!is_error_reported)
return stat;
/* Decode BCH error using ELM module */
elm_decode_bch_error_page(info->elm_dev, ecc_vec, err_vec);
err = 0;
for (i = 0; i < eccsteps; i++) {
if (err_vec[i].error_uncorrectable) {
dev_err(&info->pdev->dev,
"uncorrectable bit-flips found\n");
err = -EBADMSG;
} else if (err_vec[i].error_reported) {
for (j = 0; j < err_vec[i].error_count; j++) {
switch (info->ecc_opt) {
case OMAP_ECC_BCH4_CODE_HW:
/* Add 4 bits to take care of padding */
pos = err_vec[i].error_loc[j] +
BCH4_BIT_PAD;
break;
case OMAP_ECC_BCH8_CODE_HW:
case OMAP_ECC_BCH16_CODE_HW:
pos = err_vec[i].error_loc[j];
break;
default:
return -EINVAL;
}
error_max = (ecc->size + actual_eccbytes) * 8;
/* Calculate bit position of error */
bit_pos = pos % 8;
/* Calculate byte position of error */
byte_pos = (error_max - pos - 1) / 8;
if (pos < error_max) {
if (byte_pos < 512) {
pr_debug("bitflip@dat[%d]=%x\n",
byte_pos, data[byte_pos]);
data[byte_pos] ^= 1 << bit_pos;
} else {
pr_debug("bitflip@oob[%d]=%x\n",
(byte_pos - 512),
spare_ecc[byte_pos - 512]);
spare_ecc[byte_pos - 512] ^=
1 << bit_pos;
}
} else {
dev_err(&info->pdev->dev,
"invalid bit-flip @ %d:%d\n",
byte_pos, bit_pos);
err = -EBADMSG;
}
}
}
/* Update number of correctable errors */
stat = max_t(unsigned int, stat, err_vec[i].error_count);
/* Update page data with sector size */
data += ecc->size;
spare_ecc += ecc->bytes;
}
return (err) ? err : stat;
}
/**
* omap_write_page_bch - BCH ecc based write page function for entire page
* @chip: nand chip info structure
* @buf: data buffer
* @oob_required: must write chip->oob_poi to OOB
* @page: page
*
* Custom write page method evolved to support multi sector writing in one shot
*/
static int omap_write_page_bch(struct nand_chip *chip, const uint8_t *buf,
int oob_required, int page)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct omap_nand_info *info = mtd_to_omap(mtd);
uint8_t *ecc_calc = chip->ecc.calc_buf;
unsigned int eccpg;
int ret;
ret = nand_prog_page_begin_op(chip, page, 0, NULL, 0);
if (ret)
return ret;
for (eccpg = 0; eccpg < info->neccpg; eccpg++) {
/* Enable GPMC ecc engine */
chip->ecc.hwctl(chip, NAND_ECC_WRITE);
/* Write data */
info->data_out(chip, buf + (eccpg * info->eccpg_size),
info->eccpg_size, false);
/* Update ecc vector from GPMC result registers */
ret = omap_calculate_ecc_bch_multi(mtd,
buf + (eccpg * info->eccpg_size),
ecc_calc);
if (ret)
return ret;
ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc,
chip->oob_poi,
eccpg * info->eccpg_bytes,
info->eccpg_bytes);
if (ret)
return ret;
}
/* Write ecc vector to OOB area */
info->data_out(chip, chip->oob_poi, mtd->oobsize, false);
return nand_prog_page_end_op(chip);
}
/**
* omap_write_subpage_bch - BCH hardware ECC based subpage write
* @chip: nand chip info structure
* @offset: column address of subpage within the page
* @data_len: data length
* @buf: data buffer
* @oob_required: must write chip->oob_poi to OOB
* @page: page number to write
*
* OMAP optimized subpage write method.
*/
static int omap_write_subpage_bch(struct nand_chip *chip, u32 offset,
u32 data_len, const u8 *buf,
int oob_required, int page)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct omap_nand_info *info = mtd_to_omap(mtd);
u8 *ecc_calc = chip->ecc.calc_buf;
int ecc_size = chip->ecc.size;
int ecc_bytes = chip->ecc.bytes;
u32 start_step = offset / ecc_size;
u32 end_step = (offset + data_len - 1) / ecc_size;
unsigned int eccpg;
int step, ret = 0;
/*
* Write entire page at one go as it would be optimal
* as ECC is calculated by hardware.
* ECC is calculated for all subpages but we choose
* only what we want.
*/
ret = nand_prog_page_begin_op(chip, page, 0, NULL, 0);
if (ret)
return ret;
for (eccpg = 0; eccpg < info->neccpg; eccpg++) {
/* Enable GPMC ECC engine */
chip->ecc.hwctl(chip, NAND_ECC_WRITE);
/* Write data */
info->data_out(chip, buf + (eccpg * info->eccpg_size),
info->eccpg_size, false);
for (step = 0; step < info->nsteps_per_eccpg; step++) {
unsigned int base_step = eccpg * info->nsteps_per_eccpg;
const u8 *bufoffs = buf + (eccpg * info->eccpg_size);
/* Mask ECC of un-touched subpages with 0xFFs */
if ((step + base_step) < start_step ||
(step + base_step) > end_step)
memset(ecc_calc + (step * ecc_bytes), 0xff,
ecc_bytes);
else
ret = _omap_calculate_ecc_bch(mtd,
bufoffs + (step * ecc_size),
ecc_calc + (step * ecc_bytes),
step);
if (ret)
return ret;
}
/*
* Copy the calculated ECC for the whole page including the
* masked values (0xFF) corresponding to unwritten subpages.
*/
ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi,
eccpg * info->eccpg_bytes,
info->eccpg_bytes);
if (ret)
return ret;
}
/* write OOB buffer to NAND device */
info->data_out(chip, chip->oob_poi, mtd->oobsize, false);
return nand_prog_page_end_op(chip);
}
/**
* omap_read_page_bch - BCH ecc based page read function for entire page
* @chip: nand chip info structure
* @buf: buffer to store read data
* @oob_required: caller requires OOB data read to chip->oob_poi
* @page: page number to read
*
* For BCH ecc scheme, GPMC used for syndrome calculation and ELM module
* used for error correction.
* Custom method evolved to support ELM error correction & multi sector
* reading. On reading page data area is read along with OOB data with
* ecc engine enabled. ecc vector updated after read of OOB data.
* For non error pages ecc vector reported as zero.
*/
static int omap_read_page_bch(struct nand_chip *chip, uint8_t *buf,
int oob_required, int page)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct omap_nand_info *info = mtd_to_omap(mtd);
uint8_t *ecc_calc = chip->ecc.calc_buf;
uint8_t *ecc_code = chip->ecc.code_buf;
unsigned int max_bitflips = 0, eccpg;
int stat, ret;
ret = nand_read_page_op(chip, page, 0, NULL, 0);
if (ret)
return ret;
for (eccpg = 0; eccpg < info->neccpg; eccpg++) {
/* Enable GPMC ecc engine */
chip->ecc.hwctl(chip, NAND_ECC_READ);
/* Read data */
ret = nand_change_read_column_op(chip, eccpg * info->eccpg_size,
buf + (eccpg * info->eccpg_size),
info->eccpg_size, false);
if (ret)
return ret;
/* Read oob bytes */
ret = nand_change_read_column_op(chip,
mtd->writesize + BBM_LEN +
(eccpg * info->eccpg_bytes),
chip->oob_poi + BBM_LEN +
(eccpg * info->eccpg_bytes),
info->eccpg_bytes, false);
if (ret)
return ret;
/* Calculate ecc bytes */
ret = omap_calculate_ecc_bch_multi(mtd,
buf + (eccpg * info->eccpg_size),
ecc_calc);
if (ret)
return ret;
ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code,
chip->oob_poi,
eccpg * info->eccpg_bytes,
info->eccpg_bytes);
if (ret)
return ret;
stat = chip->ecc.correct(chip,
buf + (eccpg * info->eccpg_size),
ecc_code, ecc_calc);
if (stat < 0) {
mtd->ecc_stats.failed++;
} else {
mtd->ecc_stats.corrected += stat;
max_bitflips = max_t(unsigned int, max_bitflips, stat);
}
}
return max_bitflips;
}
/**
* is_elm_present - checks for presence of ELM module by scanning DT nodes
* @info: NAND device structure containing platform data
* @elm_node: ELM's DT node
*/
static bool is_elm_present(struct omap_nand_info *info,
struct device_node *elm_node)
{
struct platform_device *pdev;
/* check whether elm-id is passed via DT */
if (!elm_node) {
dev_err(&info->pdev->dev, "ELM devicetree node not found\n");
return false;
}
pdev = of_find_device_by_node(elm_node);
/* check whether ELM device is registered */
if (!pdev) {
dev_err(&info->pdev->dev, "ELM device not found\n");
return false;
}
/* ELM module available, now configure it */
info->elm_dev = &pdev->dev;
return true;
}
static bool omap2_nand_ecc_check(struct omap_nand_info *info)
{
bool ecc_needs_bch, ecc_needs_omap_bch, ecc_needs_elm;
switch (info->ecc_opt) {
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
ecc_needs_omap_bch = false;
ecc_needs_bch = true;
ecc_needs_elm = false;
break;
case OMAP_ECC_BCH4_CODE_HW:
case OMAP_ECC_BCH8_CODE_HW:
case OMAP_ECC_BCH16_CODE_HW:
ecc_needs_omap_bch = true;
ecc_needs_bch = false;
ecc_needs_elm = true;
break;
default:
ecc_needs_omap_bch = false;
ecc_needs_bch = false;
ecc_needs_elm = false;
break;
}
if (ecc_needs_bch && !IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_BCH)) {
dev_err(&info->pdev->dev,
"CONFIG_MTD_NAND_ECC_SW_BCH not enabled\n");
return false;
}
if (ecc_needs_omap_bch && !IS_ENABLED(CONFIG_MTD_NAND_OMAP_BCH)) {
dev_err(&info->pdev->dev,
"CONFIG_MTD_NAND_OMAP_BCH not enabled\n");
return false;
}
if (ecc_needs_elm && !is_elm_present(info, info->elm_of_node)) {
dev_err(&info->pdev->dev, "ELM not available\n");
return false;
}
return true;
}
static const char * const nand_xfer_types[] = {
[NAND_OMAP_PREFETCH_POLLED] = "prefetch-polled",
[NAND_OMAP_POLLED] = "polled",
[NAND_OMAP_PREFETCH_DMA] = "prefetch-dma",
[NAND_OMAP_PREFETCH_IRQ] = "prefetch-irq",
};
static int omap_get_dt_info(struct device *dev, struct omap_nand_info *info)
{
struct device_node *child = dev->of_node;
int i;
const char *s;
u32 cs;
if (of_property_read_u32(child, "reg", &cs) < 0) {
dev_err(dev, "reg not found in DT\n");
return -EINVAL;
}
info->gpmc_cs = cs;
/* detect availability of ELM module. Won't be present pre-OMAP4 */
info->elm_of_node = of_parse_phandle(child, "ti,elm-id", 0);
if (!info->elm_of_node) {
info->elm_of_node = of_parse_phandle(child, "elm_id", 0);
if (!info->elm_of_node)
dev_dbg(dev, "ti,elm-id not in DT\n");
}
/* select ecc-scheme for NAND */
if (of_property_read_string(child, "ti,nand-ecc-opt", &s)) {
dev_err(dev, "ti,nand-ecc-opt not found\n");
return -EINVAL;
}
if (!strcmp(s, "sw")) {
info->ecc_opt = OMAP_ECC_HAM1_CODE_SW;
} else if (!strcmp(s, "ham1") ||
!strcmp(s, "hw") || !strcmp(s, "hw-romcode")) {
info->ecc_opt = OMAP_ECC_HAM1_CODE_HW;
} else if (!strcmp(s, "bch4")) {
if (info->elm_of_node)
info->ecc_opt = OMAP_ECC_BCH4_CODE_HW;
else
info->ecc_opt = OMAP_ECC_BCH4_CODE_HW_DETECTION_SW;
} else if (!strcmp(s, "bch8")) {
if (info->elm_of_node)
info->ecc_opt = OMAP_ECC_BCH8_CODE_HW;
else
info->ecc_opt = OMAP_ECC_BCH8_CODE_HW_DETECTION_SW;
} else if (!strcmp(s, "bch16")) {
info->ecc_opt = OMAP_ECC_BCH16_CODE_HW;
} else {
dev_err(dev, "unrecognized value for ti,nand-ecc-opt\n");
return -EINVAL;
}
/* select data transfer mode */
if (!of_property_read_string(child, "ti,nand-xfer-type", &s)) {
for (i = 0; i < ARRAY_SIZE(nand_xfer_types); i++) {
if (!strcasecmp(s, nand_xfer_types[i])) {
info->xfer_type = i;
return 0;
}
}
dev_err(dev, "unrecognized value for ti,nand-xfer-type\n");
return -EINVAL;
}
return 0;
}
static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct omap_nand_info *info = mtd_to_omap(mtd);
struct nand_chip *chip = &info->nand;
int off = BBM_LEN;
if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
!(chip->options & NAND_BUSWIDTH_16))
off = 1;
if (section)
return -ERANGE;
oobregion->offset = off;
oobregion->length = chip->ecc.total;
return 0;
}
static int omap_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct omap_nand_info *info = mtd_to_omap(mtd);
struct nand_chip *chip = &info->nand;
int off = BBM_LEN;
if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW &&
!(chip->options & NAND_BUSWIDTH_16))
off = 1;
if (section)
return -ERANGE;
off += chip->ecc.total;
if (off >= mtd->oobsize)
return -ERANGE;
oobregion->offset = off;
oobregion->length = mtd->oobsize - off;
return 0;
}
static const struct mtd_ooblayout_ops omap_ooblayout_ops = {
.ecc = omap_ooblayout_ecc,
.free = omap_ooblayout_free,
};
static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_device *nand = mtd_to_nanddev(mtd);
unsigned int nsteps = nanddev_get_ecc_nsteps(nand);
unsigned int ecc_bytes = nanddev_get_ecc_bytes_per_step(nand);
int off = BBM_LEN;
if (section >= nsteps)
return -ERANGE;
/*
* When SW correction is employed, one OMAP specific marker byte is
* reserved after each ECC step.
*/
oobregion->offset = off + (section * (ecc_bytes + 1));
oobregion->length = ecc_bytes;
return 0;
}
static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_device *nand = mtd_to_nanddev(mtd);
unsigned int nsteps = nanddev_get_ecc_nsteps(nand);
unsigned int ecc_bytes = nanddev_get_ecc_bytes_per_step(nand);
int off = BBM_LEN;
if (section)
return -ERANGE;
/*
* When SW correction is employed, one OMAP specific marker byte is
* reserved after each ECC step.
*/
off += ((ecc_bytes + 1) * nsteps);
if (off >= mtd->oobsize)
return -ERANGE;
oobregion->offset = off;
oobregion->length = mtd->oobsize - off;
return 0;
}
static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
.ecc = omap_sw_ooblayout_ecc,
.free = omap_sw_ooblayout_free,
};
static int omap_nand_attach_chip(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct omap_nand_info *info = mtd_to_omap(mtd);
struct device *dev = &info->pdev->dev;
int min_oobbytes = BBM_LEN;
int elm_bch_strength = -1;
int oobbytes_per_step;
dma_cap_mask_t mask;
int err;
if (chip->bbt_options & NAND_BBT_USE_FLASH)
chip->bbt_options |= NAND_BBT_NO_OOB;
else
chip->options |= NAND_SKIP_BBTSCAN;
/* Re-populate low-level callbacks based on xfer modes */
switch (info->xfer_type) {
case NAND_OMAP_PREFETCH_POLLED:
info->data_in = omap_nand_data_in_pref;
info->data_out = omap_nand_data_out_pref;
break;
case NAND_OMAP_POLLED:
/* Use nand_base defaults for {read,write}_buf */
break;
case NAND_OMAP_PREFETCH_DMA:
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
info->dma = dma_request_chan(dev->parent, "rxtx");
if (IS_ERR(info->dma)) {
dev_err(dev, "DMA engine request failed\n");
return PTR_ERR(info->dma);
} else {
struct dma_slave_config cfg;
memset(&cfg, 0, sizeof(cfg));
cfg.src_addr = info->phys_base;
cfg.dst_addr = info->phys_base;
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
cfg.src_maxburst = 16;
cfg.dst_maxburst = 16;
err = dmaengine_slave_config(info->dma, &cfg);
if (err) {
dev_err(dev,
"DMA engine slave config failed: %d\n",
err);
return err;
}
info->data_in = omap_nand_data_in_dma_pref;
info->data_out = omap_nand_data_out_dma_pref;
}
break;
case NAND_OMAP_PREFETCH_IRQ:
info->gpmc_irq_fifo = platform_get_irq(info->pdev, 0);
if (info->gpmc_irq_fifo <= 0)
return -ENODEV;
err = devm_request_irq(dev, info->gpmc_irq_fifo,
omap_nand_irq, IRQF_SHARED,
"gpmc-nand-fifo", info);
if (err) {
dev_err(dev, "Requesting IRQ %d, error %d\n",
info->gpmc_irq_fifo, err);
info->gpmc_irq_fifo = 0;
return err;
}
info->gpmc_irq_count = platform_get_irq(info->pdev, 1);
if (info->gpmc_irq_count <= 0)
return -ENODEV;
err = devm_request_irq(dev, info->gpmc_irq_count,
omap_nand_irq, IRQF_SHARED,
"gpmc-nand-count", info);
if (err) {
dev_err(dev, "Requesting IRQ %d, error %d\n",
info->gpmc_irq_count, err);
info->gpmc_irq_count = 0;
return err;
}
info->data_in = omap_nand_data_in_irq_pref;
info->data_out = omap_nand_data_out_irq_pref;
break;
default:
dev_err(dev, "xfer_type %d not supported!\n", info->xfer_type);
return -EINVAL;
}
if (!omap2_nand_ecc_check(info))
return -EINVAL;
/*
* Bail out earlier to let NAND_ECC_ENGINE_TYPE_SOFT code create its own
* ooblayout instead of using ours.
*/
if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
return 0;
}
/* Populate MTD interface based on ECC scheme */
switch (info->ecc_opt) {
case OMAP_ECC_HAM1_CODE_HW:
dev_info(dev, "nand: using OMAP_ECC_HAM1_CODE_HW\n");
chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
chip->ecc.bytes = 3;
chip->ecc.size = 512;
chip->ecc.strength = 1;
chip->ecc.calculate = omap_calculate_ecc;
chip->ecc.hwctl = omap_enable_hwecc;
chip->ecc.correct = omap_correct_data;
mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
oobbytes_per_step = chip->ecc.bytes;
if (!(chip->options & NAND_BUSWIDTH_16))
min_oobbytes = 1;
break;
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
pr_info("nand: using OMAP_ECC_BCH4_CODE_HW_DETECTION_SW\n");
chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
chip->ecc.size = 512;
chip->ecc.bytes = 7;
chip->ecc.strength = 4;
chip->ecc.hwctl = omap_enable_hwecc_bch;
chip->ecc.correct = rawnand_sw_bch_correct;
chip->ecc.calculate = omap_calculate_ecc_bch_sw;
mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
/* Reserve one byte for the OMAP marker */
oobbytes_per_step = chip->ecc.bytes + 1;
/* Software BCH library is used for locating errors */
err = rawnand_sw_bch_init(chip);
if (err) {
dev_err(dev, "Unable to use BCH library\n");
return err;
}
break;
case OMAP_ECC_BCH4_CODE_HW:
pr_info("nand: using OMAP_ECC_BCH4_CODE_HW ECC scheme\n");
chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
chip->ecc.size = 512;
/* 14th bit is kept reserved for ROM-code compatibility */
chip->ecc.bytes = 7 + 1;
chip->ecc.strength = 4;
chip->ecc.hwctl = omap_enable_hwecc_bch;
chip->ecc.correct = omap_elm_correct_data;
chip->ecc.read_page = omap_read_page_bch;
chip->ecc.write_page = omap_write_page_bch;
chip->ecc.write_subpage = omap_write_subpage_bch;
mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
oobbytes_per_step = chip->ecc.bytes;
elm_bch_strength = BCH4_ECC;
break;
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
pr_info("nand: using OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n");
chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
chip->ecc.size = 512;
chip->ecc.bytes = 13;
chip->ecc.strength = 8;
chip->ecc.hwctl = omap_enable_hwecc_bch;
chip->ecc.correct = rawnand_sw_bch_correct;
chip->ecc.calculate = omap_calculate_ecc_bch_sw;
mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
/* Reserve one byte for the OMAP marker */
oobbytes_per_step = chip->ecc.bytes + 1;
/* Software BCH library is used for locating errors */
err = rawnand_sw_bch_init(chip);
if (err) {
dev_err(dev, "unable to use BCH library\n");
return err;
}
break;
case OMAP_ECC_BCH8_CODE_HW:
pr_info("nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme\n");
chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
chip->ecc.size = 512;
/* 14th bit is kept reserved for ROM-code compatibility */
chip->ecc.bytes = 13 + 1;
chip->ecc.strength = 8;
chip->ecc.hwctl = omap_enable_hwecc_bch;
chip->ecc.correct = omap_elm_correct_data;
chip->ecc.read_page = omap_read_page_bch;
chip->ecc.write_page = omap_write_page_bch;
chip->ecc.write_subpage = omap_write_subpage_bch;
mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
oobbytes_per_step = chip->ecc.bytes;
elm_bch_strength = BCH8_ECC;
break;
case OMAP_ECC_BCH16_CODE_HW:
pr_info("Using OMAP_ECC_BCH16_CODE_HW ECC scheme\n");
chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
chip->ecc.size = 512;
chip->ecc.bytes = 26;
chip->ecc.strength = 16;
chip->ecc.hwctl = omap_enable_hwecc_bch;
chip->ecc.correct = omap_elm_correct_data;
chip->ecc.read_page = omap_read_page_bch;
chip->ecc.write_page = omap_write_page_bch;
chip->ecc.write_subpage = omap_write_subpage_bch;
mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
oobbytes_per_step = chip->ecc.bytes;
elm_bch_strength = BCH16_ECC;
break;
default:
dev_err(dev, "Invalid or unsupported ECC scheme\n");
return -EINVAL;
}
if (elm_bch_strength >= 0) {
chip->ecc.steps = mtd->writesize / chip->ecc.size;
info->neccpg = chip->ecc.steps / ERROR_VECTOR_MAX;
if (info->neccpg) {
info->nsteps_per_eccpg = ERROR_VECTOR_MAX;
} else {
info->neccpg = 1;
info->nsteps_per_eccpg = chip->ecc.steps;
}
info->eccpg_size = info->nsteps_per_eccpg * chip->ecc.size;
info->eccpg_bytes = info->nsteps_per_eccpg * chip->ecc.bytes;
err = elm_config(info->elm_dev, elm_bch_strength,
info->nsteps_per_eccpg, chip->ecc.size,
chip->ecc.bytes);
if (err < 0)
return err;
}
/* Check if NAND device's OOB is enough to store ECC signatures */
min_oobbytes += (oobbytes_per_step *
(mtd->writesize / chip->ecc.size));
if (mtd->oobsize < min_oobbytes) {
dev_err(dev,
"Not enough OOB bytes: required = %d, available=%d\n",
min_oobbytes, mtd->oobsize);
return -EINVAL;
}
return 0;
}
static void omap_nand_data_in(struct nand_chip *chip, void *buf,
unsigned int len, bool force_8bit)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
u32 alignment = ((uintptr_t)buf | len) & 3;
if (force_8bit || (alignment & 1))
ioread8_rep(info->fifo, buf, len);
else if (alignment & 3)
ioread16_rep(info->fifo, buf, len >> 1);
else
ioread32_rep(info->fifo, buf, len >> 2);
}
static void omap_nand_data_out(struct nand_chip *chip,
const void *buf, unsigned int len,
bool force_8bit)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
u32 alignment = ((uintptr_t)buf | len) & 3;
if (force_8bit || (alignment & 1))
iowrite8_rep(info->fifo, buf, len);
else if (alignment & 3)
iowrite16_rep(info->fifo, buf, len >> 1);
else
iowrite32_rep(info->fifo, buf, len >> 2);
}
static int omap_nand_exec_instr(struct nand_chip *chip,
const struct nand_op_instr *instr)
{
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
unsigned int i;
int ret;
switch (instr->type) {
case NAND_OP_CMD_INSTR:
iowrite8(instr->ctx.cmd.opcode,
info->reg.gpmc_nand_command);
break;
case NAND_OP_ADDR_INSTR:
for (i = 0; i < instr->ctx.addr.naddrs; i++) {
iowrite8(instr->ctx.addr.addrs[i],
info->reg.gpmc_nand_address);
}
break;
case NAND_OP_DATA_IN_INSTR:
info->data_in(chip, instr->ctx.data.buf.in,
instr->ctx.data.len,
instr->ctx.data.force_8bit);
break;
case NAND_OP_DATA_OUT_INSTR:
info->data_out(chip, instr->ctx.data.buf.out,
instr->ctx.data.len,
instr->ctx.data.force_8bit);
break;
case NAND_OP_WAITRDY_INSTR:
ret = info->ready_gpiod ?
nand_gpio_waitrdy(chip, info->ready_gpiod, instr->ctx.waitrdy.timeout_ms) :
nand_soft_waitrdy(chip, instr->ctx.waitrdy.timeout_ms);
if (ret)
return ret;
break;
}
if (instr->delay_ns)
ndelay(instr->delay_ns);
return 0;
}
static int omap_nand_exec_op(struct nand_chip *chip,
const struct nand_operation *op,
bool check_only)
{
unsigned int i;
if (check_only)
return 0;
for (i = 0; i < op->ninstrs; i++) {
int ret;
ret = omap_nand_exec_instr(chip, &op->instrs[i]);
if (ret)
return ret;
}
return 0;
}
static const struct nand_controller_ops omap_nand_controller_ops = {
.attach_chip = omap_nand_attach_chip,
.exec_op = omap_nand_exec_op,
};
/* Shared among all NAND instances to synchronize access to the ECC Engine */
static struct nand_controller omap_gpmc_controller;
static bool omap_gpmc_controller_initialized;
static int omap_nand_probe(struct platform_device *pdev)
{
struct omap_nand_info *info;
struct mtd_info *mtd;
struct nand_chip *nand_chip;
int err;
struct resource *res;
struct device *dev = &pdev->dev;
void __iomem *vaddr;
info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
info->pdev = pdev;
err = omap_get_dt_info(dev, info);
if (err)
return err;
info->ops = gpmc_omap_get_nand_ops(&info->reg, info->gpmc_cs);
if (!info->ops) {
dev_err(&pdev->dev, "Failed to get GPMC->NAND interface\n");
return -ENODEV;
}
nand_chip = &info->nand;
mtd = nand_to_mtd(nand_chip);
mtd->dev.parent = &pdev->dev;
nand_set_flash_node(nand_chip, dev->of_node);
if (!mtd->name) {
mtd->name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
"omap2-nand.%d", info->gpmc_cs);
if (!mtd->name) {
dev_err(&pdev->dev, "Failed to set MTD name\n");
return -ENOMEM;
}
}
vaddr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(vaddr))
return PTR_ERR(vaddr);
info->fifo = vaddr;
info->phys_base = res->start;
if (!omap_gpmc_controller_initialized) {
omap_gpmc_controller.ops = &omap_nand_controller_ops;
nand_controller_init(&omap_gpmc_controller);
omap_gpmc_controller_initialized = true;
}
nand_chip->controller = &omap_gpmc_controller;
info->ready_gpiod = devm_gpiod_get_optional(&pdev->dev, "rb",
GPIOD_IN);
if (IS_ERR(info->ready_gpiod)) {
dev_err(dev, "failed to get ready gpio\n");
return PTR_ERR(info->ready_gpiod);
}
if (info->flash_bbt)
nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
/* default operations */
info->data_in = omap_nand_data_in;
info->data_out = omap_nand_data_out;
err = nand_scan(nand_chip, 1);
if (err)
goto return_error;
err = mtd_device_register(mtd, NULL, 0);
if (err)
goto cleanup_nand;
platform_set_drvdata(pdev, mtd);
return 0;
cleanup_nand:
nand_cleanup(nand_chip);
return_error:
if (!IS_ERR_OR_NULL(info->dma))
dma_release_channel(info->dma);
rawnand_sw_bch_cleanup(nand_chip);
return err;
}
static void omap_nand_remove(struct platform_device *pdev)
{
struct mtd_info *mtd = platform_get_drvdata(pdev);
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct omap_nand_info *info = mtd_to_omap(mtd);
rawnand_sw_bch_cleanup(nand_chip);
if (info->dma)
dma_release_channel(info->dma);
WARN_ON(mtd_device_unregister(mtd));
nand_cleanup(nand_chip);
}
/* omap_nand_ids defined in linux/platform_data/mtd-nand-omap2.h */
MODULE_DEVICE_TABLE(of, omap_nand_ids);
static struct platform_driver omap_nand_driver = {
.probe = omap_nand_probe,
.remove_new = omap_nand_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = omap_nand_ids,
},
};
module_platform_driver(omap_nand_driver);
MODULE_ALIAS("platform:" DRIVER_NAME);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Glue layer for NAND flash on TI OMAP boards");