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authorMagnus Damm <damm@opensource.se>2010-01-27 09:17:21 +0000
committerPaul Mundt <lethal@linux-sh.org>2010-02-02 13:02:16 +0900
commit010ab820582d03bcd3648416b5837107e8a9c5f3 (patch)
tree074fb1fba3a498072fce060e04196e0d590b9154 /drivers/mtd
parentb79c7adf82e8b8a6d6ad1dadf7e687a4a030cf8c (diff)
downloadop-kernel-dev-010ab820582d03bcd3648416b5837107e8a9c5f3.zip
op-kernel-dev-010ab820582d03bcd3648416b5837107e8a9c5f3.tar.gz
mtd: sh_flctl SHBUSSEL and SEL_16BIT support
This patch extends the sh_flctl driver with support for 16-bit bus configuration using SEL_16BIT and support for multiplexed pins using SHBUSSEL. Signed-off-by: Magnus Damm <damm@opensource.se> Acked-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/sh_flctl.c27
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
index ab068a5..1842df8 100644
--- a/drivers/mtd/nand/sh_flctl.c
+++ b/drivers/mtd/nand/sh_flctl.c
@@ -105,6 +105,8 @@ static void set_addr(struct mtd_info *mtd, int column, int page_addr)
addr = page_addr; /* ERASE1 */
} else if (page_addr != -1) {
/* SEQIN, READ0, etc.. */
+ if (flctl->chip.options & NAND_BUSWIDTH_16)
+ column >>= 1;
if (flctl->page_size) {
addr = column & 0x0FFF;
addr |= (page_addr & 0xff) << 16;
@@ -280,7 +282,7 @@ static void write_fiforeg(struct sh_flctl *flctl, int rlen, int offset)
static void set_cmd_regs(struct mtd_info *mtd, uint32_t cmd, uint32_t flcmcdr_val)
{
struct sh_flctl *flctl = mtd_to_flctl(mtd);
- uint32_t flcmncr_val = readl(FLCMNCR(flctl));
+ uint32_t flcmncr_val = readl(FLCMNCR(flctl)) & ~SEL_16BIT;
uint32_t flcmdcr_val, addr_len_bytes = 0;
/* Set SNAND bit if page size is 2048byte */
@@ -302,6 +304,8 @@ static void set_cmd_regs(struct mtd_info *mtd, uint32_t cmd, uint32_t flcmcdr_va
case NAND_CMD_READOOB:
addr_len_bytes = flctl->rw_ADRCNT;
flcmdcr_val |= CDSRC_E;
+ if (flctl->chip.options & NAND_BUSWIDTH_16)
+ flcmncr_val |= SEL_16BIT;
break;
case NAND_CMD_SEQIN:
/* This case is that cmd is READ0 or READ1 or READ00 */
@@ -310,6 +314,8 @@ static void set_cmd_regs(struct mtd_info *mtd, uint32_t cmd, uint32_t flcmcdr_va
case NAND_CMD_PAGEPROG:
addr_len_bytes = flctl->rw_ADRCNT;
flcmdcr_val |= DOCMD2_E | CDSRC_E | SELRW;
+ if (flctl->chip.options & NAND_BUSWIDTH_16)
+ flcmncr_val |= SEL_16BIT;
break;
case NAND_CMD_READID:
flcmncr_val &= ~SNAND_E;
@@ -528,6 +534,8 @@ static void flctl_cmdfunc(struct mtd_info *mtd, unsigned int command,
set_addr(mtd, 0, page_addr);
flctl->read_bytes = mtd->writesize + mtd->oobsize;
+ if (flctl->chip.options & NAND_BUSWIDTH_16)
+ column >>= 1;
flctl->index += column;
goto read_normal_exit;
@@ -691,6 +699,18 @@ static uint8_t flctl_read_byte(struct mtd_info *mtd)
return data;
}
+static uint16_t flctl_read_word(struct mtd_info *mtd)
+{
+ struct sh_flctl *flctl = mtd_to_flctl(mtd);
+ int index = flctl->index;
+ uint16_t data;
+ uint16_t *buf = (uint16_t *)&flctl->done_buff[index];
+
+ data = *buf;
+ flctl->index += 2;
+ return data;
+}
+
static void flctl_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
int i;
@@ -829,6 +849,11 @@ static int __devinit flctl_probe(struct platform_device *pdev)
nand->select_chip = flctl_select_chip;
nand->cmdfunc = flctl_cmdfunc;
+ if (pdata->flcmncr_val & SEL_16BIT) {
+ nand->options |= NAND_BUSWIDTH_16;
+ nand->read_word = flctl_read_word;
+ }
+
ret = nand_scan_ident(flctl_mtd, 1);
if (ret)
goto err;
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