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[MTD] [NAND] driver extension to support NAND on TQM85xx modules

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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>
This commit is contained in:
Wolfgang Grandegger 2008-06-09 10:19:08 +02:00 committed by David Woodhouse
parent 95ebffd749
commit 13f5369704
2 changed files with 14 additions and 5 deletions
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2
drivers/mtd/nand/Kconfig
View File

@ -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

17
drivers/mtd/nand/fsl_upm.c
View File

@ -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) {