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Subject[PATCH v5 05/12] mtd: pxa3xx_nand: rework flash detection and timing setup
Date
Rework the pxa3xx_nand driver to allow using functions exported by the
nand framework to detect the flash and the timings. Then setup the
timings using the helpers previously added.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
---
drivers/mtd/nand/pxa3xx_nand.c | 114 ++++++++++-------------------------------
1 file changed, 26 insertions(+), 88 deletions(-)

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index b5aad4c46115..6d8d191ee05b 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -1322,48 +1322,25 @@ static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
return NAND_STATUS_READY;
}

-static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info,
- const struct pxa3xx_nand_flash *f)
+static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info)
{
struct platform_device *pdev = info->pdev;
struct pxa3xx_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct pxa3xx_nand_host *host = info->host[info->cs];
+ struct mtd_info *mtd = host->mtd;
+ struct nand_chip *chip = mtd->priv;
uint32_t ndcr = 0x0; /* enable all interrupts */

- if (f->page_size != 2048 && f->page_size != 512) {
- dev_err(&pdev->dev, "Current only support 2048 and 512 size\n");
- return -EINVAL;
- }
-
- if (f->flash_width != 16 && f->flash_width != 8) {
- dev_err(&pdev->dev, "Only support 8bit and 16 bit!\n");
- return -EINVAL;
- }
-
- /* calculate flash information */
- host->read_id_bytes = (f->page_size == 2048) ? 4 : 2;
-
- /* calculate addressing information */
- host->col_addr_cycles = (f->page_size == 2048) ? 2 : 1;
-
- if (f->num_blocks * f->page_per_block > 65536)
- host->row_addr_cycles = 3;
- else
- host->row_addr_cycles = 2;
-
ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0;
ndcr |= (host->col_addr_cycles == 2) ? NDCR_RA_START : 0;
- ndcr |= (f->page_per_block == 64) ? NDCR_PG_PER_BLK : 0;
- ndcr |= (f->page_size == 2048) ? NDCR_PAGE_SZ : 0;
- ndcr |= (f->flash_width == 16) ? NDCR_DWIDTH_M : 0;
- ndcr |= (f->dfc_width == 16) ? NDCR_DWIDTH_C : 0;
+ ndcr |= (chip->page_shift == 6) ? NDCR_PG_PER_BLK : 0;
+ ndcr |= (mtd->writesize == 2048) ? NDCR_PAGE_SZ : 0;

ndcr |= NDCR_RD_ID_CNT(host->read_id_bytes);
ndcr |= NDCR_SPARE_EN; /* enable spare by default */

info->reg_ndcr = ndcr;

- pxa3xx_nand_set_timing(host, f->timing);
return 0;
}

@@ -1458,20 +1435,28 @@ static void pxa3xx_nand_free_buff(struct pxa3xx_nand_info *info)
}
#endif

-static int pxa3xx_nand_sensing(struct pxa3xx_nand_info *info)
+static int pxa3xx_nand_sensing(struct pxa3xx_nand_host *host)
{
+ struct pxa3xx_nand_info *info = host->info_data;
struct mtd_info *mtd;
struct nand_chip *chip;
+ const struct nand_sdr_timings *timings;
int ret;

mtd = info->host[info->cs]->mtd;
chip = mtd->priv;

- /* use the common timing to make a try */
- ret = pxa3xx_nand_config_flash(info, &builtin_flash_types[0]);
+ ret = pxa3xx_nand_config_flash(info);
if (ret)
return ret;

+ /* 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)
@@ -1555,12 +1540,8 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
struct pxa3xx_nand_info *info = host->info_data;
struct platform_device *pdev = info->pdev;
struct pxa3xx_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct nand_flash_dev pxa3xx_flash_ids[2], *def = NULL;
- const struct pxa3xx_nand_flash *f = NULL;
struct nand_chip *chip = mtd->priv;
- uint32_t id = -1;
- uint64_t chipsize;
- int i, ret, num;
+ int ret;
uint16_t ecc_strength, ecc_step;

if (pdata->keep_config && !pxa3xx_nand_detect_config(info))
@@ -1569,7 +1550,7 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
/* Set a default chunk size */
info->chunk_size = 512;

- ret = pxa3xx_nand_sensing(info);
+ ret = pxa3xx_nand_sensing(host);
if (ret) {
dev_info(&info->pdev->dev, "There is no chip on cs %d!\n",
info->cs);
@@ -1577,64 +1558,20 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
return ret;
}

- chip->cmdfunc(mtd, NAND_CMD_READID, 0, 0);
- id = *((uint16_t *)(info->data_buff));
- if (id != 0)
- dev_info(&info->pdev->dev, "Detect a flash id %x\n", id);
- else {
- dev_warn(&info->pdev->dev,
- "Read out ID 0, potential timing set wrong!!\n");
-
- return -EINVAL;
- }
-
- num = ARRAY_SIZE(builtin_flash_types) + pdata->num_flash - 1;
- for (i = 0; i < num; i++) {
- if (i < pdata->num_flash)
- f = pdata->flash + i;
- else
- f = &builtin_flash_types[i - pdata->num_flash + 1];
-
- /* find the chip in default list */
- if (f->chip_id == id)
- break;
- }
-
- if (i >= (ARRAY_SIZE(builtin_flash_types) + pdata->num_flash - 1)) {
- dev_err(&info->pdev->dev, "ERROR!! flash not defined!!!\n");
-
- return -EINVAL;
- }
-
- ret = pxa3xx_nand_config_flash(info, f);
- if (ret) {
- dev_err(&info->pdev->dev, "ERROR! Configure failed\n");
- return ret;
- }
-
- memset(pxa3xx_flash_ids, 0, sizeof(pxa3xx_flash_ids));
-
- pxa3xx_flash_ids[0].name = f->name;
- pxa3xx_flash_ids[0].dev_id = (f->chip_id >> 8) & 0xffff;
- pxa3xx_flash_ids[0].pagesize = f->page_size;
- chipsize = (uint64_t)f->num_blocks * f->page_per_block * f->page_size;
- pxa3xx_flash_ids[0].chipsize = chipsize >> 20;
- pxa3xx_flash_ids[0].erasesize = f->page_size * f->page_per_block;
- if (f->flash_width == 16)
- pxa3xx_flash_ids[0].options = NAND_BUSWIDTH_16;
- pxa3xx_flash_ids[1].name = NULL;
- def = pxa3xx_flash_ids;
KEEP_CONFIG:
- if (info->reg_ndcr & NDCR_DWIDTH_M)
- chip->options |= NAND_BUSWIDTH_16;
-
/* 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, def))
+ if (nand_scan_ident(mtd, 1, NULL))
return -ENODEV;

+ ret = pxa3xx_nand_init_timings(host);
+ if (ret) {
+ dev_err(&info->pdev->dev, "Failed to set timings: %d\n", ret);
+ return ret;
+ }
+
if (pdata->flash_bbt) {
/*
* We'll use a bad block table stored in-flash and don't
@@ -1732,6 +1669,7 @@ static int alloc_nand_resource(struct platform_device *pdev)
host->mtd = mtd;
host->cs = cs;
host->info_data = info;
+ host->read_id_bytes = 4;
mtd->priv = host;
mtd->owner = THIS_MODULE;

--
2.4.0


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