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mtd: nand: pxa3xx: Add a read/write buffers markers

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In preparation to support multiple (aka chunked, aka splitted)
page I/O, this commit adds 'data_buff_pos' and 'oob_buff_pos' fields
to keep track of where the next read (or write) should be done.

This will allow multiple calls to handle_data_pio() to continue
the read (or write) operation.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Ezequiel Garcia 2013-11-14 18:25:36 -03:00 committed by Brian Norris
parent e7f9a6a462
commit fa543bef72
1 changed files with 29 additions and 11 deletions
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40
drivers/mtd/nand/pxa3xx_nand.c
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@ -176,6 +176,8 @@ struct pxa3xx_nand_info {
unsigned int buf_start;
unsigned int buf_count;
unsigned int buf_size;
unsigned int data_buff_pos;
unsigned int oob_buff_pos;
/* DMA information */
int drcmr_dat;
@ -334,11 +336,12 @@ static void pxa3xx_nand_set_timing(struct pxa3xx_nand_host *host,
* spare and ECC configuration.
* Only applicable to READ0, READOOB and PAGEPROG commands.
*/
static void pxa3xx_set_datasize(struct pxa3xx_nand_info *info)
static void pxa3xx_set_datasize(struct pxa3xx_nand_info *info,
struct mtd_info *mtd)
{
int oob_enable = info->reg_ndcr & NDCR_SPARE_EN;
info->data_size = info->fifo_size;
info->data_size = mtd->writesize;
if (!oob_enable)
return;
@ -426,26 +429,39 @@ static void disable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
static void handle_data_pio(struct pxa3xx_nand_info *info)
{
unsigned int do_bytes = min(info->data_size, info->fifo_size);
switch (info->state) {
case STATE_PIO_WRITING:
__raw_writesl(info->mmio_base + NDDB, info->data_buff,
DIV_ROUND_UP(info->data_size, 4));
__raw_writesl(info->mmio_base + NDDB,
info->data_buff + info->data_buff_pos,
DIV_ROUND_UP(do_bytes, 4));
if (info->oob_size > 0)
__raw_writesl(info->mmio_base + NDDB, info->oob_buff,
DIV_ROUND_UP(info->oob_size, 4));
__raw_writesl(info->mmio_base + NDDB,
info->oob_buff + info->oob_buff_pos,
DIV_ROUND_UP(info->oob_size, 4));
break;
case STATE_PIO_READING:
__raw_readsl(info->mmio_base + NDDB, info->data_buff,
DIV_ROUND_UP(info->data_size, 4));
__raw_readsl(info->mmio_base + NDDB,
info->data_buff + info->data_buff_pos,
DIV_ROUND_UP(do_bytes, 4));
if (info->oob_size > 0)
__raw_readsl(info->mmio_base + NDDB, info->oob_buff,
DIV_ROUND_UP(info->oob_size, 4));
__raw_readsl(info->mmio_base + NDDB,
info->oob_buff + info->oob_buff_pos,
DIV_ROUND_UP(info->oob_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 += do_bytes;
info->oob_buff_pos += info->oob_size;
info->data_size -= do_bytes;
}
#ifdef ARCH_HAS_DMA
@ -612,6 +628,8 @@ static void prepare_start_command(struct pxa3xx_nand_info *info, int command)
info->buf_start = 0;
info->buf_count = 0;
info->oob_size = 0;
info->data_buff_pos = 0;
info->oob_buff_pos = 0;
info->use_ecc = 0;
info->use_spare = 1;
info->retcode = ERR_NONE;
@ -622,7 +640,7 @@ static void prepare_start_command(struct pxa3xx_nand_info *info, int command)
case NAND_CMD_PAGEPROG:
info->use_ecc = 1;
case NAND_CMD_READOOB:
pxa3xx_set_datasize(info);
pxa3xx_set_datasize(info, mtd);
break;
case NAND_CMD_PARAM:
info->use_spare = 0;