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| author | Wolfgang Grandegger <wg@grandegger.com> | 2008-06-09 10:19:08 +0200 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2008-10-10 07:29:00 +0100 |
| commit | 13f5369704d3c27a07936999f063be3a8a905398 (patch) | |
| tree | 3476e63f12d214b157756946aac0ff4516a98160 /drivers | |
| parent | 95ebffd749c8e6c8cbb746bc0833a5738cc23321 (diff) | |
| download | op-kernel-dev-13f5369704d3c27a07936999f063be3a8a905398.zip op-kernel-dev-13f5369704d3c27a07936999f063be3a8a905398.tar.gz | |
[MTD] [NAND] driver extension to support NAND on TQM85xx modules
This patch extends the FSL UPM NAND driver from Anton Vorontsov to
support hardware which does not have the R/B pin of the NAND chip
connected, like the TQM8548 module:
- The OF_GPIO dependency has been removed from the Kconfig option
because GPIO is not needed. The relevant gpio_* function are then
stubbed out in <linux/gpio.h>.
- It re-introduces the chip-delay property to define an appropriate
maximum delay time (tR) required for read operations. The binding
will be documented in a separate patch.
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/nand/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/mtd/nand/fsl_upm.c | 17 |
2 files changed, 14 insertions, 5 deletions
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig index 7153854..18b9ffe 100644 --- a/drivers/mtd/nand/Kconfig +++ b/drivers/mtd/nand/Kconfig @@ -401,7 +401,7 @@ config MTD_NAND_FSL_ELBC config MTD_NAND_FSL_UPM tristate "Support for NAND on Freescale UPM" - depends on MTD_NAND && OF_GPIO && (PPC_83xx || PPC_85xx) + depends on MTD_NAND && (PPC_83xx || PPC_85xx) select FSL_LBC help Enables support for NAND Flash chips wired onto Freescale PowerPC diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c index 3af5ef3..024e3ff 100644 --- a/drivers/mtd/nand/fsl_upm.c +++ b/drivers/mtd/nand/fsl_upm.c @@ -13,6 +13,7 @@ #include <linux/kernel.h> #include <linux/module.h> +#include <linux/delay.h> #include <linux/mtd/nand.h> #include <linux/mtd/nand_ecc.h> #include <linux/mtd/partitions.h> @@ -36,6 +37,7 @@ struct fsl_upm_nand { uint8_t upm_cmd_offset; void __iomem *io_base; int rnb_gpio; + int chip_delay; }; #define to_fsl_upm_nand(mtd) container_of(mtd, struct fsl_upm_nand, mtd) @@ -58,10 +60,11 @@ static void fun_wait_rnb(struct fsl_upm_nand *fun) if (fun->rnb_gpio >= 0) { while (--cnt && !fun_chip_ready(&fun->mtd)) cpu_relax(); + if (!cnt) + dev_err(fun->dev, "tired waiting for RNB\n"); + } else { + ndelay(100); } - - if (!cnt) - dev_err(fun->dev, "tired waiting for RNB\n"); } static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) @@ -129,7 +132,7 @@ static int __devinit fun_chip_init(struct fsl_upm_nand *fun, fun->chip.IO_ADDR_R = fun->io_base; fun->chip.IO_ADDR_W = fun->io_base; fun->chip.cmd_ctrl = fun_cmd_ctrl; - fun->chip.chip_delay = 50; + fun->chip.chip_delay = fun->chip_delay; fun->chip.read_byte = fun_read_byte; fun->chip.read_buf = fun_read_buf; fun->chip.write_buf = fun_write_buf; @@ -228,6 +231,12 @@ static int __devinit fun_probe(struct of_device *ofdev, goto err2; } + prop = of_get_property(ofdev->node, "chip-delay", NULL); + if (prop) + fun->chip_delay = *prop; + else + fun->chip_delay = 50; + fun->io_base = devm_ioremap_nocache(&ofdev->dev, io_res.start, io_res.end - io_res.start + 1); if (!fun->io_base) { |
