From 13f5369704d3c27a07936999f063be3a8a905398 Mon Sep 17 00:00:00 2001 From: Wolfgang Grandegger Date: Mon, 9 Jun 2008 10:19:08 +0200 Subject: [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 . - 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 Signed-off-by: David Woodhouse --- drivers/mtd/nand/fsl_upm.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) (limited to 'drivers/mtd/nand/fsl_upm.c') diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c index 3af5ef399a0f..024e3fffd4bb 100644 --- a/drivers/mtd/nand/fsl_upm.c +++ b/drivers/mtd/nand/fsl_upm.c @@ -13,6 +13,7 @@ #include #include +#include #include #include #include @@ -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) { -- cgit v1.2.3