From: Wolfgang Grandegger <w...@grandegger.com>
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 "wait_flags" field allowing the board-specific driver
to specify various types of extra delay.
Signed-off-by: Wolfgang Grandegger <w...@grandegger.com>
---
drivers/mtd/nand/fsl_upm.c | 20 ++++++++++++++++++--
1 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c
index f42955c..0ffc872 100644
--- a/drivers/mtd/nand/fsl_upm.c
+++ b/drivers/mtd/nand/fsl_upm.c
@@ -25,6 +25,10 @@
#define FSL_UPM_NAND_MAX_CHIPS 4
+#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;
@@ -44,6 +48,7 @@ struct fsl_upm_nand {
uint32_t max_chips;
uint32_t chip_number;
uint32_t chip_offset;
+ uint32_t wait_flags;
};
#define to_fsl_upm_nand(mtd) container_of(mtd, struct fsl_upm_nand, mtd)
@@ -101,7 +106,8 @@ static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd,
unsigned int ctrl)
}
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 chip_nr)
@@ -143,8 +149,11 @@ 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,
@@ -293,6 +302,13 @@ static int __devinit fun_probe(struct of_device *ofdev,
if (prop && size == sizeof(uint32_t))
fun->chip_offset = *prop;
+ prop = of_get_property(ofdev->node, "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) {
--
1.6.0.6
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
