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[ARM] 5105/1: CM-X270: update NAND flash driver to use gpio_lib

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Update CM-X270 NAND flash driver to use gpio_lib.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Mike Rapoport 2008-06-17 09:48:46 +01:00 committed by Russell King
parent 779c545d94
commit 70eb33d67a
1 changed files with 47 additions and 32 deletions
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79
drivers/mtd/nand/cmx270_nand.c
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@ -20,9 +20,11 @@
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/gpio.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
@ -30,20 +32,6 @@
#define GPIO_NAND_CS (11)
#define GPIO_NAND_RB (89)
/* This macro needed to ensure in-order operation of GPIO and local
* bus. Without both asm command and dummy uncached read there're
* states when NAND access is broken. I've looked for such macro(s) in
* include/asm-arm but found nothing approptiate.
* dmac_clean_range is close, but is makes cache invalidation
* unnecessary here and it cannot be used in module
*/
#define DRAIN_WB() \
do { \
unsigned char dummy; \
asm volatile ("mcr p15, 0, r0, c7, c10, 4":::"r0"); \
dummy=*((unsigned char*)UNCACHED_ADDR); \
} while(0)
/* MTD structure for CM-X270 board */
static struct mtd_info *cmx270_nand_mtd;
@ -103,14 +91,14 @@ static int cmx270_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
static inline void nand_cs_on(void)
{
GPCR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
gpio_set_value(GPIO_NAND_CS, 0);
}
static void nand_cs_off(void)
{
DRAIN_WB();
dsb();
GPSR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
gpio_set_value(GPIO_NAND_CS, 1);
}
/*
@ -122,7 +110,7 @@ static void cmx270_hwcontrol(struct mtd_info *mtd, int dat,
struct nand_chip* this = mtd->priv;
unsigned int nandaddr = (unsigned int)this->IO_ADDR_W;
DRAIN_WB();
dsb();
if (ctrl & NAND_CTRL_CHANGE) {
if ( ctrl & NAND_ALE )
@ -139,12 +127,12 @@ static void cmx270_hwcontrol(struct mtd_info *mtd, int dat,
nand_cs_off();
}
DRAIN_WB();
dsb();
this->IO_ADDR_W = (void __iomem*)nandaddr;
if (dat != NAND_CMD_NONE)
writel((dat << 16), this->IO_ADDR_W);
DRAIN_WB();
dsb();
}
/*
@ -152,9 +140,9 @@ static void cmx270_hwcontrol(struct mtd_info *mtd, int dat,
*/
static int cmx270_device_ready(struct mtd_info *mtd)
{
DRAIN_WB();
dsb();
return (GPLR(GPIO_NAND_RB) & GPIO_bit(GPIO_NAND_RB));
return (gpio_get_value(GPIO_NAND_RB));
}
/*
@ -168,20 +156,40 @@ static int cmx270_init(void)
int mtd_parts_nb = 0;
int ret;
if (!machine_is_armcore())
return -ENODEV;
ret = gpio_request(GPIO_NAND_CS, "NAND CS");
if (ret) {
pr_warning("CM-X270: failed to request NAND CS gpio\n");
return ret;
}
gpio_direction_output(GPIO_NAND_CS, 1);
ret = gpio_request(GPIO_NAND_RB, "NAND R/B");
if (ret) {
pr_warning("CM-X270: failed to request NAND R/B gpio\n");
goto err_gpio_request;
}
gpio_direction_input(GPIO_NAND_RB);
/* Allocate memory for MTD device structure and private data */
cmx270_nand_mtd = kzalloc(sizeof(struct mtd_info) +
sizeof(struct nand_chip),
GFP_KERNEL);
if (!cmx270_nand_mtd) {
printk("Unable to allocate CM-X270 NAND MTD device structure.\n");
return -ENOMEM;
pr_debug("Unable to allocate CM-X270 NAND MTD device structure.\n");
ret = -ENOMEM;
goto err_kzalloc;
}
cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12);
if (!cmx270_nand_io) {
printk("Unable to ioremap NAND device\n");
pr_debug("Unable to ioremap NAND device\n");
ret = -EINVAL;
goto err1;
goto err_ioremap;
}
/* Get pointer to private data */
@ -209,9 +217,9 @@ static int cmx270_init(void)
/* Scan to find existence of the device */
if (nand_scan (cmx270_nand_mtd, 1)) {
printk(KERN_NOTICE "No NAND device\n");
pr_notice("No NAND device\n");
ret = -ENXIO;
goto err2;
goto err_scan;
}
#ifdef CONFIG_MTD_CMDLINE_PARTS
@ -229,18 +237,22 @@ static int cmx270_init(void)
}
/* Register the partitions */
printk(KERN_NOTICE "Using %s partition definition\n", part_type);
pr_notice("Using %s partition definition\n", part_type);
ret = add_mtd_partitions(cmx270_nand_mtd, mtd_parts, mtd_parts_nb);
if (ret)
goto err2;
goto err_scan;
/* Return happy */
return 0;
err2:
err_scan:
iounmap(cmx270_nand_io);
err1:
err_ioremap:
kfree(cmx270_nand_mtd);
err_kzalloc:
gpio_free(GPIO_NAND_RB);
err_gpio_request:
gpio_free(GPIO_NAND_CS);
return ret;
@ -255,6 +267,9 @@ static void cmx270_cleanup(void)
/* Release resources, unregister device */
nand_release(cmx270_nand_mtd);
gpio_free(GPIO_NAND_RB);
gpio_free(GPIO_NAND_CS);
iounmap(cmx270_nand_io);
/* Free the MTD device structure */