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u-boot/drivers/mtd/nand/raw/pxa3xx_nand.c
Miquel Raynal c907464a0a mtd: rawnand: pxa3xx: fix 2kiB pages with 8b strength chips layout 
The initial layout for such NAND chips was the following:

+----------------------------------------------------------------------------+
| 1024 (data) | 30 (ECC) | 1024 (data) | 30 (ECC) | 32 (free OOB) | 30 (ECC) |
+----------------------------------------------------------------------------+

This layout has a weakness: reading empty pages trigger ECC errors
(this is expected), but the hardware ECC engine tries to correct the
data anyway and creates itself bitflips, hence bitflips are detected
in erased pages while actually there are none in the NAND chip.

Two solutions have been found at the same time. One was to enlarge the
free OOB area to 64 bytes, changing the layout to be:

+----------------------------------------------------------------------------+
| 1024 (data) | 30 (ECC) | 1024 (data) | 30 (ECC) | 64 (free OOB) | 30 (ECC) |
+----------------------------------------------------------------------------+
                                                    ^^

The very big drawbacks of this solution are:
1/ It prevents booting from NAND.
2/ The current Linux driver (marvell_nand) does not have such problem
because it already re-reads possible empty pages in raw mode before
checking for bitflips. Using different layouts in U-Boot and Linux
would simply not work.

As this driver does support raw reads now and uses it to check for
empty pages, let's forget about this broken hack and return to the
initial layout with only 32 free OOB bytes.

Fixes: ac56a3b30c ("mtd: nand: pxa3xx: add support for 2KB 8-bit flash")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Jagan Teki <jagan@openedev.com>
2018-11-22 11:38:13 +05:30

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// SPDX-License-Identifier: GPL-2.0
/*
* drivers/mtd/nand/raw/pxa3xx_nand.c
*
* Copyright © 2005 Intel Corporation
* Copyright © 2006 Marvell International Ltd.
*/
#include <common.h>
#include <malloc.h>
#include <fdtdec.h>
#include <nand.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
#include <linux/types.h>
#include "pxa3xx_nand.h"
DECLARE_GLOBAL_DATA_PTR;
#define TIMEOUT_DRAIN_FIFO 5 /* in ms */
#define CHIP_DELAY_TIMEOUT 200
#define NAND_STOP_DELAY 40
/*
* Define a buffer size for the initial command that detects the flash device:
* STATUS, READID and PARAM.
* ONFI param page is 256 bytes, and there are three redundant copies
* to be read. JEDEC param page is 512 bytes, and there are also three
* redundant copies to be read.
* Hence this buffer should be at least 512 x 3. Let's pick 2048.
*/
#define INIT_BUFFER_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 NDECCCTRL (0x28) /* ECC control */
#define NDDB (0x40) /* Data Buffer */
#define NDCB0 (0x48) /* Command Buffer0 */
#define NDCB1 (0x4C) /* Command Buffer1 */
#define NDCB2 (0x50) /* Command Buffer2 */
#define NDCR_SPARE_EN (0x1 << 31)
#define NDCR_ECC_EN (0x1 << 30)
#define NDCR_DMA_EN (0x1 << 29)
#define NDCR_ND_RUN (0x1 << 28)
#define NDCR_DWIDTH_C (0x1 << 27)
#define NDCR_DWIDTH_M (0x1 << 26)
#define NDCR_PAGE_SZ (0x1 << 24)
#define NDCR_NCSX (0x1 << 23)
#define NDCR_ND_MODE (0x3 << 21)
#define NDCR_NAND_MODE (0x0)
#define NDCR_CLR_PG_CNT (0x1 << 20)
#define NFCV1_NDCR_ARB_CNTL (0x1 << 19)
#define NDCR_RD_ID_CNT_MASK (0x7 << 16)
#define NDCR_RD_ID_CNT(x) (((x) << 16) & NDCR_RD_ID_CNT_MASK)
#define NDCR_RA_START (0x1 << 15)
#define NDCR_PG_PER_BLK (0x1 << 14)
#define NDCR_ND_ARB_EN (0x1 << 12)
#define NDCR_INT_MASK (0xFFF)
#define NDSR_MASK (0xfff)
#define NDSR_ERR_CNT_OFF (16)
#define NDSR_ERR_CNT_MASK (0x1f)
#define NDSR_ERR_CNT(sr) ((sr >> NDSR_ERR_CNT_OFF) & NDSR_ERR_CNT_MASK)
#define NDSR_RDY (0x1 << 12)
#define NDSR_FLASH_RDY (0x1 << 11)
#define NDSR_CS0_PAGED (0x1 << 10)
#define NDSR_CS1_PAGED (0x1 << 9)
#define NDSR_CS0_CMDD (0x1 << 8)
#define NDSR_CS1_CMDD (0x1 << 7)
#define NDSR_CS0_BBD (0x1 << 6)
#define NDSR_CS1_BBD (0x1 << 5)
#define NDSR_UNCORERR (0x1 << 4)
#define NDSR_CORERR (0x1 << 3)
#define NDSR_WRDREQ (0x1 << 2)
#define NDSR_RDDREQ (0x1 << 1)
#define NDSR_WRCMDREQ (0x1)
#define NDCB0_LEN_OVRD (0x1 << 28)
#define NDCB0_ST_ROW_EN (0x1 << 26)
#define NDCB0_AUTO_RS (0x1 << 25)
#define NDCB0_CSEL (0x1 << 24)
#define NDCB0_EXT_CMD_TYPE_MASK (0x7 << 29)
#define NDCB0_EXT_CMD_TYPE(x) (((x) << 29) & NDCB0_EXT_CMD_TYPE_MASK)
#define NDCB0_CMD_TYPE_MASK (0x7 << 21)
#define NDCB0_CMD_TYPE(x) (((x) << 21) & NDCB0_CMD_TYPE_MASK)
#define NDCB0_NC (0x1 << 20)
#define NDCB0_DBC (0x1 << 19)
#define NDCB0_ADDR_CYC_MASK (0x7 << 16)
#define NDCB0_ADDR_CYC(x) (((x) << 16) & NDCB0_ADDR_CYC_MASK)
#define NDCB0_CMD2_MASK (0xff << 8)
#define NDCB0_CMD1_MASK (0xff)
#define NDCB0_ADDR_CYC_SHIFT (16)
#define EXT_CMD_TYPE_DISPATCH 6 /* Command dispatch */
#define EXT_CMD_TYPE_NAKED_RW 5 /* Naked read or Naked write */
#define EXT_CMD_TYPE_READ 4 /* Read */
#define EXT_CMD_TYPE_DISP_WR 4 /* Command dispatch with write */
#define EXT_CMD_TYPE_FINAL 3 /* Final command */
#define EXT_CMD_TYPE_LAST_RW 1 /* Last naked read/write */
#define EXT_CMD_TYPE_MONO 0 /* Monolithic read/write */
/*
* This should be large enough to read 'ONFI' and 'JEDEC'.
* Let's use 7 bytes, which is the maximum ID count supported
* by the controller (see NDCR_RD_ID_CNT_MASK).
*/
#define READ_ID_BYTES 7
/* macros for registers read/write */
#define nand_writel(info, off, val) \
writel((val), (info)->mmio_base + (off))
#define nand_readl(info, off) \
readl((info)->mmio_base + (off))
/* error code and state */
enum {
ERR_NONE = 0,
ERR_DMABUSERR = -1,
ERR_SENDCMD = -2,
ERR_UNCORERR = -3,
ERR_BBERR = -4,
ERR_CORERR = -5,
};
enum {
STATE_IDLE = 0,
STATE_PREPARED,
STATE_CMD_HANDLE,
STATE_DMA_READING,
STATE_DMA_WRITING,
STATE_DMA_DONE,
STATE_PIO_READING,
STATE_PIO_WRITING,
STATE_CMD_DONE,
STATE_READY,
};
enum pxa3xx_nand_variant {
PXA3XX_NAND_VARIANT_PXA,
PXA3XX_NAND_VARIANT_ARMADA370,
};
struct pxa3xx_nand_host {
struct nand_chip chip;
void *info_data;
/* page size of attached chip */
int use_ecc;
int cs;
/* calculated from pxa3xx_nand_flash data */
unsigned int col_addr_cycles;
unsigned int row_addr_cycles;
};
struct pxa3xx_nand_info {
struct nand_hw_control controller;
struct pxa3xx_nand_platform_data *pdata;
struct clk *clk;
void __iomem *mmio_base;
unsigned long mmio_phys;
int cmd_complete, dev_ready;
unsigned int buf_start;
unsigned int buf_count;
unsigned int buf_size;
unsigned int data_buff_pos;
unsigned int oob_buff_pos;
unsigned char *data_buff;
unsigned char *oob_buff;
struct pxa3xx_nand_host *host[NUM_CHIP_SELECT];
unsigned int state;
/*
* This driver supports NFCv1 (as found in PXA SoC)
* and NFCv2 (as found in Armada 370/XP SoC).
*/
enum pxa3xx_nand_variant variant;
int cs;
int use_ecc; /* use HW ECC ? */
int force_raw; /* prevent use_ecc to be set */
int ecc_bch; /* using BCH ECC? */
int use_spare; /* use spare ? */
int need_wait;
/* Amount of real data per full chunk */
unsigned int chunk_size;
/* Amount of spare data per full chunk */
unsigned int spare_size;
/* Number of full chunks (i.e chunk_size + spare_size) */
unsigned int nfullchunks;
/*
* Total number of chunks. If equal to nfullchunks, then there
* are only full chunks. Otherwise, there is one last chunk of
* size (last_chunk_size + last_spare_size)
*/
unsigned int ntotalchunks;
/* Amount of real data in the last chunk */
unsigned int last_chunk_size;
/* Amount of spare data in the last chunk */
unsigned int last_spare_size;
unsigned int ecc_size;
unsigned int ecc_err_cnt;
unsigned int max_bitflips;
int retcode;
/*
* Variables only valid during command
* execution. step_chunk_size and step_spare_size is the
* amount of real data and spare data in the current
* chunk. cur_chunk is the current chunk being
* read/programmed.
*/
unsigned int step_chunk_size;
unsigned int step_spare_size;
unsigned int cur_chunk;
/* cached register value */
uint32_t reg_ndcr;
uint32_t ndtr0cs0;
uint32_t ndtr1cs0;
/* generated NDCBx register values */
uint32_t ndcb0;
uint32_t ndcb1;
uint32_t ndcb2;
uint32_t ndcb3;
};
static struct pxa3xx_nand_timing timing[] = {
/*
* tCH Enable signal hold time
* tCS Enable signal setup time
* tWH ND_nWE high duration
* tWP ND_nWE pulse time
* tRH ND_nRE high duration
* tRP ND_nRE pulse width
* tR ND_nWE high to ND_nRE low for read
* tWHR ND_nWE high to ND_nRE low for status read
* tAR ND_ALE low to ND_nRE low delay
*/
/*ch cs wh wp rh rp r whr ar */
{ 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, },
{ 5, 20, 10, 12, 10, 12, 25000, 60, 10, },
};
static struct pxa3xx_nand_flash builtin_flash_types[] = {
/*
* chip_id
* flash_width Width of Flash memory (DWIDTH_M)
* dfc_width Width of flash controller(DWIDTH_C)
* *timing
* http://www.linux-mtd.infradead.org/nand-data/nanddata.html
*/
{ 0x46ec, 16, 16, &timing[1] },
{ 0xdaec, 8, 8, &timing[1] },
{ 0xd7ec, 8, 8, &timing[1] },
{ 0xa12c, 8, 8, &timing[2] },
{ 0xb12c, 16, 16, &timing[2] },
{ 0xdc2c, 8, 8, &timing[2] },
{ 0xcc2c, 16, 16, &timing[2] },
{ 0xba20, 16, 16, &timing[3] },
{ 0xda98, 8, 8, &timing[4] },
};
#ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
static u8 bbt_pattern[] = {'M', 'V', 'B', 'b', 't', '0' };
static u8 bbt_mirror_pattern[] = {'1', 't', 'b', 'B', 'V', 'M' };
static struct nand_bbt_descr bbt_main_descr = {
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
| NAND_BBT_2BIT | NAND_BBT_VERSION,
.offs = 8,
.len = 6,
.veroffs = 14,
.maxblocks = 8, /* Last 8 blocks in each chip */
.pattern = bbt_pattern
};
static struct nand_bbt_descr bbt_mirror_descr = {
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
| NAND_BBT_2BIT | NAND_BBT_VERSION,
.offs = 8,
.len = 6,
.veroffs = 14,
.maxblocks = 8, /* Last 8 blocks in each chip */
.pattern = bbt_mirror_pattern
};
#endif
static struct nand_ecclayout ecc_layout_2KB_bch4bit = {
.eccbytes = 32,
.eccpos = {
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63},
.oobfree = { {2, 30} }
};
static struct nand_ecclayout ecc_layout_2KB_bch8bit = {
.eccbytes = 64,
.eccpos = {
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79,
80, 81, 82, 83, 84, 85, 86, 87,
88, 89, 90, 91, 92, 93, 94, 95},
.oobfree = { {1, 4}, {6, 26} }
};
static struct nand_ecclayout ecc_layout_4KB_bch4bit = {
.eccbytes = 64,
.eccpos = {
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63,
96, 97, 98, 99, 100, 101, 102, 103,
104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127},
/* Bootrom looks in bytes 0 & 5 for bad blocks */
.oobfree = { {6, 26}, { 64, 32} }
};
static struct nand_ecclayout ecc_layout_8KB_bch4bit = {
.eccbytes = 128,
.eccpos = {
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63,
96, 97, 98, 99, 100, 101, 102, 103,
104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127,
160, 161, 162, 163, 164, 165, 166, 167,
168, 169, 170, 171, 172, 173, 174, 175,
176, 177, 178, 179, 180, 181, 182, 183,
184, 185, 186, 187, 188, 189, 190, 191,
224, 225, 226, 227, 228, 229, 230, 231,
232, 233, 234, 235, 236, 237, 238, 239,
240, 241, 242, 243, 244, 245, 246, 247,
248, 249, 250, 251, 252, 253, 254, 255},
/* Bootrom looks in bytes 0 & 5 for bad blocks */
.oobfree = { {1, 4}, {6, 26}, { 64, 32}, {128, 32}, {192, 32} }
};
static struct nand_ecclayout ecc_layout_4KB_bch8bit = {
.eccbytes = 128,
.eccpos = {
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63},
.oobfree = { }
};
static struct nand_ecclayout ecc_layout_8KB_bch8bit = {
.eccbytes = 256,
.eccpos = {},
/* HW ECC handles all ECC data and all spare area is free for OOB */
.oobfree = {{0, 160} }
};
#define NDTR0_tCH(c) (min((c), 7) << 19)
#define NDTR0_tCS(c) (min((c), 7) << 16)
#define NDTR0_tWH(c) (min((c), 7) << 11)
#define NDTR0_tWP(c) (min((c), 7) << 8)
#define NDTR0_tRH(c) (min((c), 7) << 3)
#define NDTR0_tRP(c) (min((c), 7) << 0)
#define NDTR1_tR(c) (min((c), 65535) << 16)
#define NDTR1_tWHR(c) (min((c), 15) << 4)
#define NDTR1_tAR(c) (min((c), 15) << 0)
/* convert nano-seconds to nand flash controller clock cycles */
#define ns2cycle(ns, clk) (int)((ns) * (clk / 1000000) / 1000)
static enum pxa3xx_nand_variant pxa3xx_nand_get_variant(void)
{
/* We only support the Armada 370/XP/38x for now */
return PXA3XX_NAND_VARIANT_ARMADA370;
}
static void pxa3xx_nand_set_timing(struct pxa3xx_nand_host *host,
const struct pxa3xx_nand_timing *t)
{
struct pxa3xx_nand_info *info = host->info_data;
unsigned long nand_clk = mvebu_get_nand_clock();
uint32_t ndtr0, ndtr1;
ndtr0 = NDTR0_tCH(ns2cycle(t->tCH, nand_clk)) |
NDTR0_tCS(ns2cycle(t->tCS, nand_clk)) |
NDTR0_tWH(ns2cycle(t->tWH, nand_clk)) |
NDTR0_tWP(ns2cycle(t->tWP, nand_clk)) |
NDTR0_tRH(ns2cycle(t->tRH, nand_clk)) |
NDTR0_tRP(ns2cycle(t->tRP, nand_clk));
ndtr1 = NDTR1_tR(ns2cycle(t->tR, nand_clk)) |
NDTR1_tWHR(ns2cycle(t->tWHR, nand_clk)) |
NDTR1_tAR(ns2cycle(t->tAR, nand_clk));
info->ndtr0cs0 = ndtr0;
info->ndtr1cs0 = ndtr1;
nand_writel(info, NDTR0CS0, ndtr0);
nand_writel(info, NDTR1CS0, ndtr1);
}
static void pxa3xx_nand_set_sdr_timing(struct pxa3xx_nand_host *host,
const struct nand_sdr_timings *t)
{
struct pxa3xx_nand_info *info = host->info_data;
struct nand_chip *chip = &host->chip;
unsigned long nand_clk = mvebu_get_nand_clock();
uint32_t ndtr0, ndtr1;
u32 tCH_min = DIV_ROUND_UP(t->tCH_min, 1000);
u32 tCS_min = DIV_ROUND_UP(t->tCS_min, 1000);
u32 tWH_min = DIV_ROUND_UP(t->tWH_min, 1000);
u32 tWP_min = DIV_ROUND_UP(t->tWC_min - t->tWH_min, 1000);
u32 tREH_min = DIV_ROUND_UP(t->tREH_min, 1000);
u32 tRP_min = DIV_ROUND_UP(t->tRC_min - t->tREH_min, 1000);
u32 tR = chip->chip_delay * 1000;
u32 tWHR_min = DIV_ROUND_UP(t->tWHR_min, 1000);
u32 tAR_min = DIV_ROUND_UP(t->tAR_min, 1000);
/* fallback to a default value if tR = 0 */
if (!tR)
tR = 20000;
ndtr0 = NDTR0_tCH(ns2cycle(tCH_min, nand_clk)) |
NDTR0_tCS(ns2cycle(tCS_min, nand_clk)) |
NDTR0_tWH(ns2cycle(tWH_min, nand_clk)) |
NDTR0_tWP(ns2cycle(tWP_min, nand_clk)) |
NDTR0_tRH(ns2cycle(tREH_min, nand_clk)) |
NDTR0_tRP(ns2cycle(tRP_min, nand_clk));
ndtr1 = NDTR1_tR(ns2cycle(tR, nand_clk)) |
NDTR1_tWHR(ns2cycle(tWHR_min, nand_clk)) |
NDTR1_tAR(ns2cycle(tAR_min, nand_clk));
info->ndtr0cs0 = ndtr0;
info->ndtr1cs0 = ndtr1;
nand_writel(info, NDTR0CS0, ndtr0);
nand_writel(info, NDTR1CS0, ndtr1);
}
static int pxa3xx_nand_init_timings(struct pxa3xx_nand_host *host)
{
const struct nand_sdr_timings *timings;
struct nand_chip *chip = &host->chip;
struct pxa3xx_nand_info *info = host->info_data;
const struct pxa3xx_nand_flash *f = NULL;
struct mtd_info *mtd = nand_to_mtd(&host->chip);
int mode, id, ntypes, i;
mode = onfi_get_async_timing_mode(chip);
if (mode == ONFI_TIMING_MODE_UNKNOWN) {
ntypes = ARRAY_SIZE(builtin_flash_types);
chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
id = chip->read_byte(mtd);
id |= chip->read_byte(mtd) << 0x8;
for (i = 0; i < ntypes; i++) {
f = &builtin_flash_types[i];
if (f->chip_id == id)
break;
}
if (i == ntypes) {
dev_err(&info->pdev->dev, "Error: timings not found\n");
return -EINVAL;
}
pxa3xx_nand_set_timing(host, f->timing);
if (f->flash_width == 16) {
info->reg_ndcr |= NDCR_DWIDTH_M;
chip->options |= NAND_BUSWIDTH_16;
}
info->reg_ndcr |= (f->dfc_width == 16) ? NDCR_DWIDTH_C : 0;
} else {
mode = fls(mode) - 1;
if (mode < 0)
mode = 0;
timings = onfi_async_timing_mode_to_sdr_timings(mode);
if (IS_ERR(timings))
return PTR_ERR(timings);
pxa3xx_nand_set_sdr_timing(host, timings);
}
return 0;
}
/**
* NOTE: it is a must to set ND_RUN first, then write
* command buffer, otherwise, it does not work.
* We enable all the interrupt at the same time, and
* let pxa3xx_nand_irq to handle all logic.
*/
static void pxa3xx_nand_start(struct pxa3xx_nand_info *info)
{
uint32_t ndcr;
ndcr = info->reg_ndcr;
if (info->use_ecc) {
ndcr |= NDCR_ECC_EN;
if (info->ecc_bch)
nand_writel(info, NDECCCTRL, 0x1);
} else {
ndcr &= ~NDCR_ECC_EN;
if (info->ecc_bch)
nand_writel(info, NDECCCTRL, 0x0);
}
ndcr &= ~NDCR_DMA_EN;
if (info->use_spare)
ndcr |= NDCR_SPARE_EN;
else
ndcr &= ~NDCR_SPARE_EN;
ndcr |= NDCR_ND_RUN;
/* clear status bits and run */
nand_writel(info, NDSR, NDSR_MASK);
nand_writel(info, NDCR, 0);
nand_writel(info, NDCR, ndcr);
}
static void disable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
{
uint32_t ndcr;
ndcr = nand_readl(info, NDCR);
nand_writel(info, NDCR, ndcr | int_mask);
}
static void drain_fifo(struct pxa3xx_nand_info *info, void *data, int len)
{
if (info->ecc_bch && !info->force_raw) {
u32 ts;
/*
* According to the datasheet, when reading from NDDB
* with BCH enabled, after each 32 bytes reads, we
* have to make sure that the NDSR.RDDREQ bit is set.
*
* Drain the FIFO 8 32 bits reads at a time, and skip
* the polling on the last read.
*/
while (len > 8) {
readsl(info->mmio_base + NDDB, data, 8);
ts = get_timer(0);
while (!(nand_readl(info, NDSR) & NDSR_RDDREQ)) {
if (get_timer(ts) > TIMEOUT_DRAIN_FIFO) {
dev_err(&info->pdev->dev,
"Timeout on RDDREQ while draining the FIFO\n");
return;
}
}
data += 32;
len -= 8;
}
}
readsl(info->mmio_base + NDDB, data, len);
}
static void handle_data_pio(struct pxa3xx_nand_info *info)
{
int data_len = info->step_chunk_size;
/*
* In raw mode, include the spare area and the ECC bytes that are not
* consumed by the controller in the data section. Do not reorganize
* here, do it in the ->read_page_raw() handler instead.
*/
if (info->force_raw)
data_len += info->step_spare_size + info->ecc_size;
switch (info->state) {
case STATE_PIO_WRITING:
if (info->step_chunk_size)
writesl(info->mmio_base + NDDB,
info->data_buff + info->data_buff_pos,
DIV_ROUND_UP(data_len, 4));
if (info->step_spare_size)
writesl(info->mmio_base + NDDB,
info->oob_buff + info->oob_buff_pos,
DIV_ROUND_UP(info->step_spare_size, 4));
break;
case STATE_PIO_READING:
if (info->step_chunk_size)
drain_fifo(info,
info->data_buff + info->data_buff_pos,
DIV_ROUND_UP(data_len, 4));
if (info->force_raw)
break;
if (info->step_spare_size)
drain_fifo(info,
info->oob_buff + info->oob_buff_pos,
DIV_ROUND_UP(info->step_spare_size, 4));
break;
default:
dev_err(&info->pdev->dev, "%s: invalid state %d\n", __func__,
info->state);
BUG();
}
/* Update buffer pointers for multi-page read/write */
info->data_buff_pos += data_len;
info->oob_buff_pos += info->step_spare_size;
}
static void pxa3xx_nand_irq_thread(struct pxa3xx_nand_info *info)
{
handle_data_pio(info);
info->state = STATE_CMD_DONE;
nand_writel(info, NDSR, NDSR_WRDREQ | NDSR_RDDREQ);
}
static irqreturn_t pxa3xx_nand_irq(struct pxa3xx_nand_info *info)
{
unsigned int status, is_completed = 0, is_ready = 0;
unsigned int ready, cmd_done;
irqreturn_t ret = IRQ_HANDLED;
if (info->cs == 0) {
ready = NDSR_FLASH_RDY;
cmd_done = NDSR_CS0_CMDD;
} else {
ready = NDSR_RDY;
cmd_done = NDSR_CS1_CMDD;
}
/* TODO - find out why we need the delay during write operation. */
ndelay(1);
status = nand_readl(info, NDSR);
if (status & NDSR_UNCORERR)
info->retcode = ERR_UNCORERR;
if (status & NDSR_CORERR) {
info->retcode = ERR_CORERR;
if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370 &&
info->ecc_bch)
info->ecc_err_cnt = NDSR_ERR_CNT(status);
else
info->ecc_err_cnt = 1;
/*
* Each chunk composing a page is corrected independently,
* and we need to store maximum number of corrected bitflips
* to return it to the MTD layer in ecc.read_page().
*/
info->max_bitflips = max_t(unsigned int,
info->max_bitflips,
info->ecc_err_cnt);
}
if (status & (NDSR_RDDREQ | NDSR_WRDREQ)) {
info->state = (status & NDSR_RDDREQ) ?
STATE_PIO_READING : STATE_PIO_WRITING;
/* Call the IRQ thread in U-Boot directly */
pxa3xx_nand_irq_thread(info);
return 0;
}
if (status & cmd_done) {
info->state = STATE_CMD_DONE;
is_completed = 1;
}
if (status & ready) {
info->state = STATE_READY;
is_ready = 1;
}
/*
* Clear all status bit before issuing the next command, which
* can and will alter the status bits and will deserve a new
* interrupt on its own. This lets the controller exit the IRQ
*/
nand_writel(info, NDSR, status);
if (status & NDSR_WRCMDREQ) {
status &= ~NDSR_WRCMDREQ;
info->state = STATE_CMD_HANDLE;
/*
* Command buffer registers NDCB{0-2} (and optionally NDCB3)
* must be loaded by writing directly either 12 or 16
* bytes directly to NDCB0, four bytes at a time.
*
* Direct write access to NDCB1, NDCB2 and NDCB3 is ignored
* but each NDCBx register can be read.
*/
nand_writel(info, NDCB0, info->ndcb0);
nand_writel(info, NDCB0, info->ndcb1);
nand_writel(info, NDCB0, info->ndcb2);
/* NDCB3 register is available in NFCv2 (Armada 370/XP SoC) */
if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370)
nand_writel(info, NDCB0, info->ndcb3);
}
if (is_completed)
info->cmd_complete = 1;
if (is_ready)
info->dev_ready = 1;
return ret;
}
static inline int is_buf_blank(uint8_t *buf, size_t len)
{
for (; len > 0; len--)
if (*buf++ != 0xff)
return 0;
return 1;
}
static void set_command_address(struct pxa3xx_nand_info *info,
unsigned int page_size, uint16_t column, int page_addr)
{
/* small page addr setting */
if (page_size < info->chunk_size) {
info->ndcb1 = ((page_addr & 0xFFFFFF) << 8)
| (column & 0xFF);
info->ndcb2 = 0;
} else {
info->ndcb1 = ((page_addr & 0xFFFF) << 16)
| (column & 0xFFFF);
if (page_addr & 0xFF0000)
info->ndcb2 = (page_addr & 0xFF0000) >> 16;
else
info->ndcb2 = 0;
}
}
static void prepare_start_command(struct pxa3xx_nand_info *info, int command)
{
struct pxa3xx_nand_host *host = info->host[info->cs];
struct mtd_info *mtd = nand_to_mtd(&host->chip);
/* reset data and oob column point to handle data */
info->buf_start = 0;
info->buf_count = 0;
info->data_buff_pos = 0;
info->oob_buff_pos = 0;
info->step_chunk_size = 0;
info->step_spare_size = 0;
info->cur_chunk = 0;
info->use_ecc = 0;
info->use_spare = 1;
info->retcode = ERR_NONE;
info->ecc_err_cnt = 0;
info->ndcb3 = 0;
info->need_wait = 0;
switch (command) {
case NAND_CMD_READ0:
case NAND_CMD_READOOB:
case NAND_CMD_PAGEPROG:
if (!info->force_raw)
info->use_ecc = 1;
break;
case NAND_CMD_PARAM:
info->use_spare = 0;
break;
default:
info->ndcb1 = 0;
info->ndcb2 = 0;
break;
}
/*
* If we are about to issue a read command, or about to set
* the write address, then clean the data buffer.
*/
if (command == NAND_CMD_READ0 ||
command == NAND_CMD_READOOB ||
command == NAND_CMD_SEQIN) {
info->buf_count = mtd->writesize + mtd->oobsize;
memset(info->data_buff, 0xFF, info->buf_count);
}
}
static int prepare_set_command(struct pxa3xx_nand_info *info, int command,
int ext_cmd_type, uint16_t column, int page_addr)
{
int addr_cycle, exec_cmd;
struct pxa3xx_nand_host *host;
struct mtd_info *mtd;
host = info->host[info->cs];
mtd = nand_to_mtd(&host->chip);
addr_cycle = 0;
exec_cmd = 1;
if (info->cs != 0)
info->ndcb0 = NDCB0_CSEL;
else
info->ndcb0 = 0;
if (command == NAND_CMD_SEQIN)
exec_cmd = 0;
addr_cycle = NDCB0_ADDR_CYC(host->row_addr_cycles
+ host->col_addr_cycles);
switch (command) {
case NAND_CMD_READOOB:
case NAND_CMD_READ0:
info->buf_start = column;
info->ndcb0 |= NDCB0_CMD_TYPE(0)
| addr_cycle
| NAND_CMD_READ0;
if (command == NAND_CMD_READOOB)
info->buf_start += mtd->writesize;
if (info->cur_chunk < info->nfullchunks) {
info->step_chunk_size = info->chunk_size;
info->step_spare_size = info->spare_size;
} else {
info->step_chunk_size = info->last_chunk_size;
info->step_spare_size = info->last_spare_size;
}
/*
* Multiple page read needs an 'extended command type' field,
* which is either naked-read or last-read according to the
* state.
*/
if (info->force_raw) {
info->ndcb0 |= NDCB0_DBC | (NAND_CMD_READSTART << 8) |
NDCB0_LEN_OVRD |
NDCB0_EXT_CMD_TYPE(ext_cmd_type);
info->ndcb3 = info->step_chunk_size +
info->step_spare_size + info->ecc_size;
} else if (mtd->writesize == info->chunk_size) {
info->ndcb0 |= NDCB0_DBC | (NAND_CMD_READSTART << 8);
} else if (mtd->writesize > info->chunk_size) {
info->ndcb0 |= NDCB0_DBC | (NAND_CMD_READSTART << 8)
| NDCB0_LEN_OVRD
| NDCB0_EXT_CMD_TYPE(ext_cmd_type);
info->ndcb3 = info->step_chunk_size +
info->step_spare_size;
}
set_command_address(info, mtd->writesize, column, page_addr);
break;
case NAND_CMD_SEQIN:
info->buf_start = column;
set_command_address(info, mtd->writesize, 0, page_addr);
/*
* Multiple page programming needs to execute the initial
* SEQIN command that sets the page address.
*/
if (mtd->writesize > info->chunk_size) {
info->ndcb0 |= NDCB0_CMD_TYPE(0x1)
| NDCB0_EXT_CMD_TYPE(ext_cmd_type)
| addr_cycle
| command;
exec_cmd = 1;
}
break;
case NAND_CMD_PAGEPROG:
if (is_buf_blank(info->data_buff,
(mtd->writesize + mtd->oobsize))) {
exec_cmd = 0;
break;
}
if (info->cur_chunk < info->nfullchunks) {
info->step_chunk_size = info->chunk_size;
info->step_spare_size = info->spare_size;
} else {
info->step_chunk_size = info->last_chunk_size;
info->step_spare_size = info->last_spare_size;
}
/* Second command setting for large pages */
if (mtd->writesize > info->chunk_size) {
/*
* Multiple page write uses the 'extended command'
* field. This can be used to issue a command dispatch
* or a naked-write depending on the current stage.
*/
info->ndcb0 |= NDCB0_CMD_TYPE(0x1)
| NDCB0_LEN_OVRD
| NDCB0_EXT_CMD_TYPE(ext_cmd_type);
info->ndcb3 = info->step_chunk_size +
info->step_spare_size;
/*
* This is the command dispatch that completes a chunked
* page program operation.
*/
if (info->cur_chunk == info->ntotalchunks) {
info->ndcb0 = NDCB0_CMD_TYPE(0x1)
| NDCB0_EXT_CMD_TYPE(ext_cmd_type)
| command;
info->ndcb1 = 0;
info->ndcb2 = 0;
info->ndcb3 = 0;
}
} else {
info->ndcb0 |= NDCB0_CMD_TYPE(0x1)
| NDCB0_AUTO_RS
| NDCB0_ST_ROW_EN
| NDCB0_DBC
| (NAND_CMD_PAGEPROG << 8)
| NAND_CMD_SEQIN
| addr_cycle;
}
break;
case NAND_CMD_PARAM:
info->buf_count = INIT_BUFFER_SIZE;
info->ndcb0 |= NDCB0_CMD_TYPE(0)
| NDCB0_ADDR_CYC(1)
| NDCB0_LEN_OVRD
| command;
info->ndcb1 = (column & 0xFF);
info->ndcb3 = INIT_BUFFER_SIZE;
info->step_chunk_size = INIT_BUFFER_SIZE;
break;
case NAND_CMD_READID:
info->buf_count = READ_ID_BYTES;
info->ndcb0 |= NDCB0_CMD_TYPE(3)
| NDCB0_ADDR_CYC(1)
| command;
info->ndcb1 = (column & 0xFF);
info->step_chunk_size = 8;
break;
case NAND_CMD_STATUS:
info->buf_count = 1;
info->ndcb0 |= NDCB0_CMD_TYPE(4)
| NDCB0_ADDR_CYC(1)
| command;
info->step_chunk_size = 8;
break;
case NAND_CMD_ERASE1:
info->ndcb0 |= NDCB0_CMD_TYPE(2)
| NDCB0_AUTO_RS
| NDCB0_ADDR_CYC(3)
| NDCB0_DBC
| (NAND_CMD_ERASE2 << 8)
| NAND_CMD_ERASE1;
info->ndcb1 = page_addr;
info->ndcb2 = 0;
break;
case NAND_CMD_RESET:
info->ndcb0 |= NDCB0_CMD_TYPE(5)
| command;
break;
case NAND_CMD_ERASE2:
exec_cmd = 0;
break;
default:
exec_cmd = 0;
dev_err(&info->pdev->dev, "non-supported command %x\n",
command);
break;
}
return exec_cmd;
}
static void nand_cmdfunc(struct mtd_info *mtd, unsigned command,
int column, int page_addr)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
struct pxa3xx_nand_info *info = host->info_data;
int exec_cmd;
/*
* if this is a x16 device ,then convert the input
* "byte" address into a "word" address appropriate
* for indexing a word-oriented device
*/
if (info->reg_ndcr & NDCR_DWIDTH_M)
column /= 2;
/*
* There may be different NAND chip hooked to
* different chip select, so check whether
* chip select has been changed, if yes, reset the timing
*/
if (info->cs != host->cs) {
info->cs = host->cs;
nand_writel(info, NDTR0CS0, info->ndtr0cs0);
nand_writel(info, NDTR1CS0, info->ndtr1cs0);
}
prepare_start_command(info, command);
info->state = STATE_PREPARED;
exec_cmd = prepare_set_command(info, command, 0, column, page_addr);
if (exec_cmd) {
u32 ts;
info->cmd_complete = 0;
info->dev_ready = 0;
info->need_wait = 1;
pxa3xx_nand_start(info);
ts = get_timer(0);
while (1) {
u32 status;
status = nand_readl(info, NDSR);
if (status)
pxa3xx_nand_irq(info);
if (info->cmd_complete)
break;
if (get_timer(ts) > CHIP_DELAY_TIMEOUT) {
dev_err(&info->pdev->dev, "Wait timeout!!!\n");
return;
}
}
}
info->state = STATE_IDLE;
}
static void nand_cmdfunc_extended(struct mtd_info *mtd,
const unsigned command,
int column, int page_addr)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
struct pxa3xx_nand_info *info = host->info_data;
int exec_cmd, ext_cmd_type;
/*
* if this is a x16 device then convert the input
* "byte" address into a "word" address appropriate
* for indexing a word-oriented device
*/
if (info->reg_ndcr & NDCR_DWIDTH_M)
column /= 2;
/*
* There may be different NAND chip hooked to
* different chip select, so check whether
* chip select has been changed, if yes, reset the timing
*/
if (info->cs != host->cs) {
info->cs = host->cs;
nand_writel(info, NDTR0CS0, info->ndtr0cs0);
nand_writel(info, NDTR1CS0, info->ndtr1cs0);
}
/* Select the extended command for the first command */
switch (command) {
case NAND_CMD_READ0:
case NAND_CMD_READOOB:
ext_cmd_type = EXT_CMD_TYPE_MONO;
break;
case NAND_CMD_SEQIN:
ext_cmd_type = EXT_CMD_TYPE_DISPATCH;
break;
case NAND_CMD_PAGEPROG:
ext_cmd_type = EXT_CMD_TYPE_NAKED_RW;
break;
default:
ext_cmd_type = 0;
break;
}
prepare_start_command(info, command);
/*
* Prepare the "is ready" completion before starting a command
* transaction sequence. If the command is not executed the
* completion will be completed, see below.
*
* We can do that inside the loop because the command variable
* is invariant and thus so is the exec_cmd.
*/
info->need_wait = 1;
info->dev_ready = 0;
do {
u32 ts;
info->state = STATE_PREPARED;
exec_cmd = prepare_set_command(info, command, ext_cmd_type,
column, page_addr);
if (!exec_cmd) {
info->need_wait = 0;
info->dev_ready = 1;
break;
}
info->cmd_complete = 0;
pxa3xx_nand_start(info);
ts = get_timer(0);
while (1) {
u32 status;
status = nand_readl(info, NDSR);
if (status)
pxa3xx_nand_irq(info);
if (info->cmd_complete)
break;
if (get_timer(ts) > CHIP_DELAY_TIMEOUT) {
dev_err(&info->pdev->dev, "Wait timeout!!!\n");
return;
}
}
/* Only a few commands need several steps */
if (command != NAND_CMD_PAGEPROG &&
command != NAND_CMD_READ0 &&
command != NAND_CMD_READOOB)
break;
info->cur_chunk++;
/* Check if the sequence is complete */
if (info->cur_chunk == info->ntotalchunks &&
command != NAND_CMD_PAGEPROG)
break;
/*
* After a splitted program command sequence has issued
* the command dispatch, the command sequence is complete.
*/
if (info->cur_chunk == (info->ntotalchunks + 1) &&
command == NAND_CMD_PAGEPROG &&
ext_cmd_type == EXT_CMD_TYPE_DISPATCH)
break;
if (command == NAND_CMD_READ0 || command == NAND_CMD_READOOB) {
/* Last read: issue a 'last naked read' */
if (info->cur_chunk == info->ntotalchunks - 1)
ext_cmd_type = EXT_CMD_TYPE_LAST_RW;
else
ext_cmd_type = EXT_CMD_TYPE_NAKED_RW;
/*
* If a splitted program command has no more data to transfer,
* the command dispatch must be issued to complete.
*/
} else if (command == NAND_CMD_PAGEPROG &&
info->cur_chunk == info->ntotalchunks) {
ext_cmd_type = EXT_CMD_TYPE_DISPATCH;
}
} while (1);
info->state = STATE_IDLE;
}
static int pxa3xx_nand_write_page_hwecc(struct mtd_info *mtd,
struct nand_chip *chip, const uint8_t *buf, int oob_required,
int page)
{
chip->write_buf(mtd, buf, mtd->writesize);
chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
return 0;
}
static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf, int oob_required,
int page)
{
struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
struct pxa3xx_nand_info *info = host->info_data;
int bf;
chip->read_buf(mtd, buf, mtd->writesize);
chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
if (info->retcode == ERR_CORERR && info->use_ecc) {
mtd->ecc_stats.corrected += info->ecc_err_cnt;
} else if (info->retcode == ERR_UNCORERR && info->ecc_bch) {
/*
* Empty pages will trigger uncorrectable errors. Re-read the
* entire page in raw mode and check for bits not being "1".
* If there are more than the supported strength, then it means
* this is an actual uncorrectable error.
*/
chip->ecc.read_page_raw(mtd, chip, buf, oob_required, page);
bf = nand_check_erased_ecc_chunk(buf, mtd->writesize,
chip->oob_poi, mtd->oobsize,
NULL, 0, chip->ecc.strength);
if (bf < 0) {
mtd->ecc_stats.failed++;
} else if (bf) {
mtd->ecc_stats.corrected += bf;
info->max_bitflips = max_t(unsigned int,
info->max_bitflips, bf);
info->retcode = ERR_CORERR;
} else {
info->retcode = ERR_NONE;
}
} else if (info->retcode == ERR_UNCORERR && !info->ecc_bch) {
/* Raw read is not supported with Hamming ECC engine */
if (is_buf_blank(buf, mtd->writesize))
info->retcode = ERR_NONE;
else
mtd->ecc_stats.failed++;
}
return info->max_bitflips;
}
static int pxa3xx_nand_read_page_raw(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf,
int oob_required, int page)
{
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
int chunk, ecc_off_buf;
if (!info->ecc_bch)
return -ENOTSUPP;
/*
* Set the force_raw boolean, then re-call ->cmdfunc() that will run
* pxa3xx_nand_start(), which will actually disable the ECC engine.
*/
info->force_raw = true;
chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
ecc_off_buf = (info->nfullchunks * info->spare_size) +
info->last_spare_size;
for (chunk = 0; chunk < info->nfullchunks; chunk++) {
chip->read_buf(mtd,
buf + (chunk * info->chunk_size),
info->chunk_size);
chip->read_buf(mtd,
chip->oob_poi +
(chunk * (info->spare_size)),
info->spare_size);
chip->read_buf(mtd,
chip->oob_poi + ecc_off_buf +
(chunk * (info->ecc_size)),
info->ecc_size - 2);
}
if (info->ntotalchunks > info->nfullchunks) {
chip->read_buf(mtd,
buf + (info->nfullchunks * info->chunk_size),
info->last_chunk_size);
chip->read_buf(mtd,
chip->oob_poi +
(info->nfullchunks * (info->spare_size)),
info->last_spare_size);
chip->read_buf(mtd,
chip->oob_poi + ecc_off_buf +
(info->nfullchunks * (info->ecc_size)),
info->ecc_size - 2);
}
info->force_raw = false;
return 0;
}
static int pxa3xx_nand_read_oob_raw(struct mtd_info *mtd,
struct nand_chip *chip, int page)
{
/* Invalidate page cache */
chip->pagebuf = -1;
return chip->ecc.read_page_raw(mtd, chip, chip->buffers->databuf, true,
page);
}
static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
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 nand_chip *chip = mtd_to_nand(mtd);
struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
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 nand_chip *chip = mtd_to_nand(mtd);
struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
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 nand_chip *chip = mtd_to_nand(mtd);
struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
struct pxa3xx_nand_info *info = host->info_data;
int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
memcpy(info->data_buff + info->buf_start, buf, real_len);
info->buf_start += real_len;
}
static void pxa3xx_nand_select_chip(struct mtd_info *mtd, int chip)
{
return;
}
static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
struct pxa3xx_nand_info *info = host->info_data;
if (info->need_wait) {
u32 ts;
info->need_wait = 0;
ts = get_timer(0);
while (1) {
u32 status;
status = nand_readl(info, NDSR);
if (status)
pxa3xx_nand_irq(info);
if (info->dev_ready)
break;
if (get_timer(ts) > CHIP_DELAY_TIMEOUT) {
dev_err(&info->pdev->dev, "Ready timeout!!!\n");
return NAND_STATUS_FAIL;
}
}
}
/* pxa3xx_nand_send_command has waited for command complete */
if (this->state == FL_WRITING || this->state == FL_ERASING) {
if (info->retcode == ERR_NONE)
return 0;
else
return NAND_STATUS_FAIL;
}
return NAND_STATUS_READY;
}
static int pxa3xx_nand_config_ident(struct pxa3xx_nand_info *info)
{
struct pxa3xx_nand_platform_data *pdata = info->pdata;
/* Configure default flash values */
info->reg_ndcr = 0x0; /* enable all interrupts */
info->reg_ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0;
info->reg_ndcr |= NDCR_RD_ID_CNT(READ_ID_BYTES);
info->reg_ndcr |= NDCR_SPARE_EN;
return 0;
}
static void pxa3xx_nand_config_tail(struct pxa3xx_nand_info *info)
{
struct pxa3xx_nand_host *host = info->host[info->cs];
struct mtd_info *mtd = nand_to_mtd(&info->host[info->cs]->chip);
struct nand_chip *chip = mtd_to_nand(mtd);
info->reg_ndcr |= (host->col_addr_cycles == 2) ? NDCR_RA_START : 0;
info->reg_ndcr |= (chip->page_shift == 6) ? NDCR_PG_PER_BLK : 0;
info->reg_ndcr |= (mtd->writesize == 2048) ? NDCR_PAGE_SZ : 0;
}
static void pxa3xx_nand_detect_config(struct pxa3xx_nand_info *info)
{
struct pxa3xx_nand_platform_data *pdata = info->pdata;
uint32_t ndcr = nand_readl(info, NDCR);
/* Set an initial chunk size */
info->chunk_size = ndcr & NDCR_PAGE_SZ ? 2048 : 512;
info->reg_ndcr = ndcr &
~(NDCR_INT_MASK | NDCR_ND_ARB_EN | NFCV1_NDCR_ARB_CNTL);
info->reg_ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0;
info->ndtr0cs0 = nand_readl(info, NDTR0CS0);
info->ndtr1cs0 = nand_readl(info, NDTR1CS0);
}
static int pxa3xx_nand_init_buff(struct pxa3xx_nand_info *info)
{
info->data_buff = kmalloc(info->buf_size, GFP_KERNEL);
if (info->data_buff == NULL)
return -ENOMEM;
return 0;
}
static int pxa3xx_nand_sensing(struct pxa3xx_nand_host *host)
{
struct pxa3xx_nand_info *info = host->info_data;
struct pxa3xx_nand_platform_data *pdata = info->pdata;
struct mtd_info *mtd;
struct nand_chip *chip;
const struct nand_sdr_timings *timings;
int ret;
mtd = nand_to_mtd(&info->host[info->cs]->chip);
chip = mtd_to_nand(mtd);
/* configure default flash values */
info->reg_ndcr = 0x0; /* enable all interrupts */
info->reg_ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0;
info->reg_ndcr |= NDCR_RD_ID_CNT(READ_ID_BYTES);
info->reg_ndcr |= NDCR_SPARE_EN; /* enable spare by default */
/* use the common timing to make a try */
timings = onfi_async_timing_mode_to_sdr_timings(0);
if (IS_ERR(timings))
return PTR_ERR(timings);
pxa3xx_nand_set_sdr_timing(host, timings);
chip->cmdfunc(mtd, NAND_CMD_RESET, 0, 0);
ret = chip->waitfunc(mtd, chip);
if (ret & NAND_STATUS_FAIL)
return -ENODEV;
return 0;
}
static int pxa_ecc_init(struct pxa3xx_nand_info *info,
struct nand_ecc_ctrl *ecc,
int strength, int ecc_stepsize, int page_size)
{
if (strength == 1 && ecc_stepsize == 512 && page_size == 2048) {
info->nfullchunks = 1;
info->ntotalchunks = 1;
info->chunk_size = 2048;
info->spare_size = 40;
info->ecc_size = 24;
ecc->mode = NAND_ECC_HW;
ecc->size = 512;
ecc->strength = 1;
} else if (strength == 1 && ecc_stepsize == 512 && page_size == 512) {
info->nfullchunks = 1;
info->ntotalchunks = 1;
info->chunk_size = 512;
info->spare_size = 8;
info->ecc_size = 8;
ecc->mode = NAND_ECC_HW;
ecc->size = 512;
ecc->strength = 1;
/*
* Required ECC: 4-bit correction per 512 bytes
* Select: 16-bit correction per 2048 bytes
*/
} else if (strength == 4 && ecc_stepsize == 512 && page_size == 2048) {
info->ecc_bch = 1;
info->nfullchunks = 1;
info->ntotalchunks = 1;
info->chunk_size = 2048;
info->spare_size = 32;
info->ecc_size = 32;
ecc->mode = NAND_ECC_HW;
ecc->size = info->chunk_size;
ecc->layout = &ecc_layout_2KB_bch4bit;
ecc->strength = 16;
} else if (strength == 4 && ecc_stepsize == 512 && page_size == 4096) {
info->ecc_bch = 1;
info->nfullchunks = 2;
info->ntotalchunks = 2;
info->chunk_size = 2048;
info->spare_size = 32;
info->ecc_size = 32;
ecc->mode = NAND_ECC_HW;
ecc->size = info->chunk_size;
ecc->layout = &ecc_layout_4KB_bch4bit;
ecc->strength = 16;
} else if (strength == 4 && ecc_stepsize == 512 && page_size == 8192) {
info->ecc_bch = 1;
info->nfullchunks = 4;
info->ntotalchunks = 4;
info->chunk_size = 2048;
info->spare_size = 32;
info->ecc_size = 32;
ecc->mode = NAND_ECC_HW;
ecc->size = info->chunk_size;
ecc->layout = &ecc_layout_8KB_bch4bit;
ecc->strength = 16;
/*
* Required ECC: 8-bit correction per 512 bytes
* Select: 16-bit correction per 1024 bytes
*/
} else if (strength == 8 && ecc_stepsize == 512 && page_size == 2048) {
info->ecc_bch = 1;
info->nfullchunks = 1;
info->ntotalchunks = 2;
info->chunk_size = 1024;
info->spare_size = 0;
info->last_chunk_size = 1024;
info->last_spare_size = 32;
info->ecc_size = 32;
ecc->mode = NAND_ECC_HW;
ecc->size = info->chunk_size;
ecc->layout = &ecc_layout_2KB_bch8bit;
ecc->strength = 16;
} else if (strength == 8 && ecc_stepsize == 512 && page_size == 4096) {
info->ecc_bch = 1;
info->nfullchunks = 4;
info->ntotalchunks = 5;
info->chunk_size = 1024;
info->spare_size = 0;
info->last_chunk_size = 0;
info->last_spare_size = 64;
info->ecc_size = 32;
ecc->mode = NAND_ECC_HW;
ecc->size = info->chunk_size;
ecc->layout = &ecc_layout_4KB_bch8bit;
ecc->strength = 16;
} else if (strength == 8 && ecc_stepsize == 512 && page_size == 8192) {
info->ecc_bch = 1;
info->nfullchunks = 8;
info->ntotalchunks = 9;
info->chunk_size = 1024;
info->spare_size = 0;
info->last_chunk_size = 0;
info->last_spare_size = 160;
info->ecc_size = 32;
ecc->mode = NAND_ECC_HW;
ecc->size = info->chunk_size;
ecc->layout = &ecc_layout_8KB_bch8bit;
ecc->strength = 16;
} else {
dev_err(&info->pdev->dev,
"ECC strength %d at page size %d is not supported\n",
strength, page_size);
return -ENODEV;
}
return 0;
}
static int pxa3xx_nand_scan(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
struct pxa3xx_nand_info *info = host->info_data;
struct pxa3xx_nand_platform_data *pdata = info->pdata;
int ret;
uint16_t ecc_strength, ecc_step;
if (pdata->keep_config) {
pxa3xx_nand_detect_config(info);
} else {
ret = pxa3xx_nand_config_ident(info);
if (ret)
return ret;
ret = pxa3xx_nand_sensing(host);
if (ret) {
dev_info(&info->pdev->dev,
"There is no chip on cs %d!\n",
info->cs);
return ret;
}
}
/* Device detection must be done with ECC disabled */
if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370)
nand_writel(info, NDECCCTRL, 0x0);
if (nand_scan_ident(mtd, 1, NULL))
return -ENODEV;
if (!pdata->keep_config) {
ret = pxa3xx_nand_init_timings(host);
if (ret) {
dev_err(&info->pdev->dev,
"Failed to set timings: %d\n", ret);
return ret;
}
}
#ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
/*
* We'll use a bad block table stored in-flash and don't
* allow writing the bad block marker to the flash.
*/
chip->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB_BBM;
chip->bbt_td = &bbt_main_descr;
chip->bbt_md = &bbt_mirror_descr;
#endif
if (pdata->ecc_strength && pdata->ecc_step_size) {
ecc_strength = pdata->ecc_strength;
ecc_step = pdata->ecc_step_size;
} else {
ecc_strength = chip->ecc_strength_ds;
ecc_step = chip->ecc_step_ds;
}
/* Set default ECC strength requirements on non-ONFI devices */
if (ecc_strength < 1 && ecc_step < 1) {
ecc_strength = 1;
ecc_step = 512;
}
ret = pxa_ecc_init(info, &chip->ecc, ecc_strength,
ecc_step, mtd->writesize);
if (ret)
return ret;
/*
* If the page size is bigger than the FIFO size, let's check
* we are given the right variant and then switch to the extended
* (aka split) command handling,
*/
if (mtd->writesize > info->chunk_size) {
if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370) {
chip->cmdfunc = nand_cmdfunc_extended;
} else {
dev_err(&info->pdev->dev,
"unsupported page size on this variant\n");
return -ENODEV;
}
}
/* calculate addressing information */
if (mtd->writesize >= 2048)
host->col_addr_cycles = 2;
else
host->col_addr_cycles = 1;
/* release the initial buffer */
kfree(info->data_buff);
/* allocate the real data + oob buffer */
info->buf_size = mtd->writesize + mtd->oobsize;
ret = pxa3xx_nand_init_buff(info);
if (ret)
return ret;
info->oob_buff = info->data_buff + mtd->writesize;
if ((mtd->size >> chip->page_shift) > 65536)
host->row_addr_cycles = 3;
else
host->row_addr_cycles = 2;
if (!pdata->keep_config)
pxa3xx_nand_config_tail(info);
return nand_scan_tail(mtd);
}
static int alloc_nand_resource(struct pxa3xx_nand_info *info)
{
struct pxa3xx_nand_platform_data *pdata;
struct pxa3xx_nand_host *host;
struct nand_chip *chip = NULL;
struct mtd_info *mtd;
int ret, cs;
pdata = info->pdata;
if (pdata->num_cs <= 0)
return -ENODEV;
info->variant = pxa3xx_nand_get_variant();
for (cs = 0; cs < pdata->num_cs; cs++) {
chip = (struct nand_chip *)
((u8 *)&info[1] + sizeof(*host) * cs);
mtd = nand_to_mtd(chip);
host = (struct pxa3xx_nand_host *)chip;
info->host[cs] = host;
host->cs = cs;
host->info_data = info;
mtd->owner = THIS_MODULE;
nand_set_controller_data(chip, host);
chip->ecc.read_page = pxa3xx_nand_read_page_hwecc;
chip->ecc.read_page_raw = pxa3xx_nand_read_page_raw;
chip->ecc.read_oob_raw = pxa3xx_nand_read_oob_raw;
chip->ecc.write_page = pxa3xx_nand_write_page_hwecc;
chip->controller = &info->controller;
chip->waitfunc = pxa3xx_nand_waitfunc;
chip->select_chip = pxa3xx_nand_select_chip;
chip->read_word = pxa3xx_nand_read_word;
chip->read_byte = pxa3xx_nand_read_byte;
chip->read_buf = pxa3xx_nand_read_buf;
chip->write_buf = pxa3xx_nand_write_buf;
chip->options |= NAND_NO_SUBPAGE_WRITE;
chip->cmdfunc = nand_cmdfunc;
}
/* Allocate a buffer to allow flash detection */
info->buf_size = INIT_BUFFER_SIZE;
info->data_buff = kmalloc(info->buf_size, GFP_KERNEL);
if (info->data_buff == NULL) {
ret = -ENOMEM;
goto fail_disable_clk;
}
/* initialize all interrupts to be disabled */
disable_int(info, NDSR_MASK);
return 0;
kfree(info->data_buff);
fail_disable_clk:
return ret;
}
static int pxa3xx_nand_probe_dt(struct pxa3xx_nand_info *info)
{
struct pxa3xx_nand_platform_data *pdata;
const void *blob = gd->fdt_blob;
int node = -1;
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
/* Get address decoding nodes from the FDT blob */
do {
node = fdt_node_offset_by_compatible(blob, node,
"marvell,mvebu-pxa3xx-nand");
if (node < 0)
break;
/* Bypass disabeld nodes */
if (!fdtdec_get_is_enabled(blob, node))
continue;
/* Get the first enabled NAND controler base address */
info->mmio_base =
(void __iomem *)fdtdec_get_addr_size_auto_noparent(
blob, node, "reg", 0, NULL, true);
pdata->num_cs = fdtdec_get_int(blob, node, "num-cs", 1);
if (pdata->num_cs != 1) {
pr_err("pxa3xx driver supports single CS only\n");
break;
}
if (fdtdec_get_bool(blob, node, "nand-enable-arbiter"))
pdata->enable_arbiter = 1;
if (fdtdec_get_bool(blob, node, "nand-keep-config"))
pdata->keep_config = 1;
/*
* ECC parameters.
* If these are not set, they will be selected according
* to the detected flash type.
*/
/* ECC strength */
pdata->ecc_strength = fdtdec_get_int(blob, node,
"nand-ecc-strength", 0);
/* ECC step size */
pdata->ecc_step_size = fdtdec_get_int(blob, node,
"nand-ecc-step-size", 0);
info->pdata = pdata;
/* Currently support only a single NAND controller */
return 0;
} while (node >= 0);
return -EINVAL;
}
static int pxa3xx_nand_probe(struct pxa3xx_nand_info *info)
{
struct pxa3xx_nand_platform_data *pdata;
int ret, cs, probe_success;
ret = pxa3xx_nand_probe_dt(info);
if (ret)
return ret;
pdata = info->pdata;
ret = alloc_nand_resource(info);
if (ret) {
dev_err(&pdev->dev, "alloc nand resource failed\n");
return ret;
}
probe_success = 0;
for (cs = 0; cs < pdata->num_cs; cs++) {
struct mtd_info *mtd = nand_to_mtd(&info->host[cs]->chip);
/*
* The mtd name matches the one used in 'mtdparts' kernel
* parameter. This name cannot be changed or otherwise
* user's mtd partitions configuration would get broken.
*/
mtd->name = "pxa3xx_nand-0";
info->cs = cs;
ret = pxa3xx_nand_scan(mtd);
if (ret) {
dev_info(&pdev->dev, "failed to scan nand at cs %d\n",
cs);
continue;
}
if (nand_register(cs, mtd))
continue;
probe_success = 1;
}
if (!probe_success)
return -ENODEV;
return 0;
}
/*
* Main initialization routine
*/
void board_nand_init(void)
{
struct pxa3xx_nand_info *info;
struct pxa3xx_nand_host *host;
int ret;
info = kzalloc(sizeof(*info) +
sizeof(*host) * CONFIG_SYS_MAX_NAND_DEVICE,
GFP_KERNEL);
if (!info)
return;
ret = pxa3xx_nand_probe(info);
if (ret)
return;
}
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