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[MTD] [NAND] FSL-UPM: Add wait flags to support board/chip specific delays 

The NAND flash on the TQM8548_BE modules requires a short delay after
running the UPM pattern. The TQM8548_BE requires a further short delay
after writing out a buffer. Normally the R/B pin should be checked, but
it's not connected on the TQM8548_BE. The existing driver uses similar
fixed delay points. To manage these extra delays in a more general way,
I introduced the "fsl,ump-wait-flags" property allowing the board-
specific driver to specify various types of extra delay.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Wolfgang Grandegger 2009-03-30 12:02:43 +02:00 committed by David Woodhouse
parent b6e0e8c077
commit ade92a636f
1 changed files with 18 additions and 2 deletions
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20
drivers/mtd/nand/fsl_upm.c
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@ -23,6 +23,10 @@
#include <linux/io.h>
#include <asm/fsl_lbc.h>
#define FSL_UPM_WAIT_RUN_PATTERN 0x1
#define FSL_UPM_WAIT_WRITE_BYTE 0x2
#define FSL_UPM_WAIT_WRITE_BUFFER 0x4
struct fsl_upm_nand {
struct device *dev;
struct mtd_info mtd;
@ -41,6 +45,7 @@ struct fsl_upm_nand {
uint32_t mchip_count;
uint32_t mchip_number;
int chip_delay;
uint32_t wait_flags;
};
#define to_fsl_upm_nand(mtd) container_of(mtd, struct fsl_upm_nand, mtd)
@ -96,7 +101,8 @@ static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
fun->mchip_offsets[fun->mchip_number];
fsl_upm_run_pattern(&fun->upm, chip->IO_ADDR_R, mar);
fun_wait_rnb(fun);
if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN)
fun_wait_rnb(fun);
}
static void fun_select_chip(struct mtd_info *mtd, int mchip_nr)
@ -138,8 +144,11 @@ static void fun_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
for (i = 0; i < len; i++) {
out_8(fun->chip.IO_ADDR_W, buf[i]);
fun_wait_rnb(fun);
if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE)
fun_wait_rnb(fun);
}
if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER)
fun_wait_rnb(fun);
}
static int __devinit fun_chip_init(struct fsl_upm_nand *fun,
@ -285,6 +294,13 @@ static int __devinit fun_probe(struct of_device *ofdev,
else
fun->chip_delay = 50;
prop = of_get_property(ofdev->node, "fsl,upm-wait-flags", &size);
if (prop && size == sizeof(uint32_t))
fun->wait_flags = *prop;
else
fun->wait_flags = FSL_UPM_WAIT_RUN_PATTERN |
FSL_UPM_WAIT_WRITE_BYTE;
fun->io_base = devm_ioremap_nocache(&ofdev->dev, io_res.start,
io_res.end - io_res.start + 1);
if (!fun->io_base) {