mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
[MTD] [NAND] CM-x270 MTD driver
This patch provides MTD support for NAND flash devices on CM-x270 modules. Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
parent
d1da4e50e5
commit
54d33c4c71
3 changed files with 273 additions and 0 deletions
|
@ -258,6 +258,11 @@ config MTD_NAND_AT91
|
|||
Enables support for NAND Flash / Smart Media Card interface
|
||||
on Atmel AT91 processors.
|
||||
|
||||
config MTD_NAND_CM_X270
|
||||
tristate "Support for NAND Flash on CM-X270 modules"
|
||||
depends on MTD_NAND && MACH_ARMCORE
|
||||
|
||||
|
||||
config MTD_NAND_NANDSIM
|
||||
tristate "Support for NAND Flash Simulator"
|
||||
depends on MTD_PARTITIONS
|
||||
|
|
|
@ -24,6 +24,7 @@ obj-$(CONFIG_MTD_NAND_NANDSIM) += nandsim.o
|
|||
obj-$(CONFIG_MTD_NAND_CS553X) += cs553x_nand.o
|
||||
obj-$(CONFIG_MTD_NAND_NDFC) += ndfc.o
|
||||
obj-$(CONFIG_MTD_NAND_AT91) += at91_nand.o
|
||||
obj-$(CONFIG_MTD_NAND_CM_X270) += cmx270_nand.o
|
||||
obj-$(CONFIG_MTD_NAND_BASLER_EXCITE) += excite_nandflash.o
|
||||
|
||||
nand-objs := nand_base.o nand_bbt.o
|
||||
|
|
267
drivers/mtd/nand/cmx270_nand.c
Normal file
267
drivers/mtd/nand/cmx270_nand.c
Normal file
|
@ -0,0 +1,267 @@
|
|||
/*
|
||||
* linux/drivers/mtd/nand/cmx270-nand.c
|
||||
*
|
||||
* Copyright (C) 2006 Compulab, Ltd.
|
||||
* Mike Rapoport <mike@compulab.co.il>
|
||||
*
|
||||
* Derived from drivers/mtd/nand/h1910.c
|
||||
* Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
|
||||
* Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
|
||||
*
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* Overview:
|
||||
* This is a device driver for the NAND flash device found on the
|
||||
* CM-X270 board.
|
||||
*/
|
||||
|
||||
#include <linux/mtd/nand.h>
|
||||
#include <linux/mtd/partitions.h>
|
||||
|
||||
#include <asm/io.h>
|
||||
#include <asm/irq.h>
|
||||
|
||||
#include <asm/arch/hardware.h>
|
||||
#include <asm/arch/pxa-regs.h>
|
||||
|
||||
#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;
|
||||
|
||||
/* remaped IO address of the device */
|
||||
static void __iomem *cmx270_nand_io;
|
||||
|
||||
/*
|
||||
* Define static partitions for flash device
|
||||
*/
|
||||
static struct mtd_partition partition_info[] = {
|
||||
[0] = {
|
||||
.name = "cmx270-0",
|
||||
.offset = 0,
|
||||
.size = MTDPART_SIZ_FULL
|
||||
}
|
||||
};
|
||||
#define NUM_PARTITIONS (ARRAY_SIZE(partition_info))
|
||||
|
||||
const char *part_probes[] = { "cmdlinepart", NULL };
|
||||
|
||||
static u_char cmx270_read_byte(struct mtd_info *mtd)
|
||||
{
|
||||
struct nand_chip *this = mtd->priv;
|
||||
|
||||
return (readl(this->IO_ADDR_R) >> 16);
|
||||
}
|
||||
|
||||
static void cmx270_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
|
||||
{
|
||||
int i;
|
||||
struct nand_chip *this = mtd->priv;
|
||||
|
||||
for (i=0; i<len; i++)
|
||||
writel((*buf++ << 16), this->IO_ADDR_W);
|
||||
}
|
||||
|
||||
static void cmx270_read_buf(struct mtd_info *mtd, u_char *buf, int len)
|
||||
{
|
||||
int i;
|
||||
struct nand_chip *this = mtd->priv;
|
||||
|
||||
for (i=0; i<len; i++)
|
||||
*buf++ = readl(this->IO_ADDR_R) >> 16;
|
||||
}
|
||||
|
||||
static int cmx270_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
|
||||
{
|
||||
int i;
|
||||
struct nand_chip *this = mtd->priv;
|
||||
|
||||
for (i=0; i<len; i++)
|
||||
if (buf[i] != (u_char)(readl(this->IO_ADDR_R) >> 16))
|
||||
return -EFAULT;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void nand_cs_on(void)
|
||||
{
|
||||
GPCR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
|
||||
}
|
||||
|
||||
static void nand_cs_off(void)
|
||||
{
|
||||
DRAIN_WB();
|
||||
|
||||
GPSR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
|
||||
}
|
||||
|
||||
/*
|
||||
* hardware specific access to control-lines
|
||||
*/
|
||||
static void cmx270_hwcontrol(struct mtd_info *mtd, int dat,
|
||||
unsigned int ctrl)
|
||||
{
|
||||
struct nand_chip* this = mtd->priv;
|
||||
unsigned int nandaddr = (unsigned int)this->IO_ADDR_W;
|
||||
|
||||
DRAIN_WB();
|
||||
|
||||
if (ctrl & NAND_CTRL_CHANGE) {
|
||||
if ( ctrl & NAND_ALE )
|
||||
nandaddr |= (1 << 3);
|
||||
else
|
||||
nandaddr &= ~(1 << 3);
|
||||
if ( ctrl & NAND_CLE )
|
||||
nandaddr |= (1 << 2);
|
||||
else
|
||||
nandaddr &= ~(1 << 2);
|
||||
if ( ctrl & NAND_NCE )
|
||||
nand_cs_on();
|
||||
else
|
||||
nand_cs_off();
|
||||
}
|
||||
|
||||
DRAIN_WB();
|
||||
this->IO_ADDR_W = (void __iomem*)nandaddr;
|
||||
if (dat != NAND_CMD_NONE)
|
||||
writel((dat << 16), this->IO_ADDR_W);
|
||||
|
||||
DRAIN_WB();
|
||||
}
|
||||
|
||||
/*
|
||||
* read device ready pin
|
||||
*/
|
||||
static int cmx270_device_ready(struct mtd_info *mtd)
|
||||
{
|
||||
DRAIN_WB();
|
||||
|
||||
return (GPLR(GPIO_NAND_RB) & GPIO_bit(GPIO_NAND_RB));
|
||||
}
|
||||
|
||||
/*
|
||||
* Main initialization routine
|
||||
*/
|
||||
static int cmx270_init(void)
|
||||
{
|
||||
struct nand_chip *this;
|
||||
const char *part_type;
|
||||
struct mtd_partition *mtd_parts;
|
||||
int mtd_parts_nb = 0;
|
||||
int ret;
|
||||
|
||||
/* 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;
|
||||
}
|
||||
|
||||
cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12);
|
||||
if (!cmx270_nand_io) {
|
||||
printk("Unable to ioremap NAND device\n");
|
||||
ret = -EINVAL;
|
||||
goto err1;
|
||||
}
|
||||
|
||||
/* Get pointer to private data */
|
||||
this = (struct nand_chip *)(&cmx270_nand_mtd[1]);
|
||||
|
||||
/* Link the private data with the MTD structure */
|
||||
cmx270_nand_mtd->owner = THIS_MODULE;
|
||||
cmx270_nand_mtd->priv = this;
|
||||
|
||||
/* insert callbacks */
|
||||
this->IO_ADDR_R = cmx270_nand_io;
|
||||
this->IO_ADDR_W = cmx270_nand_io;
|
||||
this->cmd_ctrl = cmx270_hwcontrol;
|
||||
this->dev_ready = cmx270_device_ready;
|
||||
|
||||
/* 15 us command delay time */
|
||||
this->chip_delay = 20;
|
||||
this->ecc.mode = NAND_ECC_SOFT;
|
||||
|
||||
/* read/write functions */
|
||||
this->read_byte = cmx270_read_byte;
|
||||
this->read_buf = cmx270_read_buf;
|
||||
this->write_buf = cmx270_write_buf;
|
||||
this->verify_buf = cmx270_verify_buf;
|
||||
|
||||
/* Scan to find existence of the device */
|
||||
if (nand_scan (cmx270_nand_mtd, 1)) {
|
||||
printk(KERN_NOTICE "No NAND device\n");
|
||||
ret = -ENXIO;
|
||||
goto err2;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_MTD_CMDLINE_PARTS
|
||||
mtd_parts_nb = parse_mtd_partitions(cmx270_nand_mtd, part_probes,
|
||||
&mtd_parts, 0);
|
||||
if (mtd_parts_nb > 0)
|
||||
part_type = "command line";
|
||||
else
|
||||
mtd_parts_nb = 0;
|
||||
#endif
|
||||
if (!mtd_parts_nb) {
|
||||
mtd_parts = partition_info;
|
||||
mtd_parts_nb = NUM_PARTITIONS;
|
||||
part_type = "static";
|
||||
}
|
||||
|
||||
/* Register the partitions */
|
||||
printk(KERN_NOTICE "Using %s partition definition\n", part_type);
|
||||
ret = add_mtd_partitions(cmx270_nand_mtd, mtd_parts, mtd_parts_nb);
|
||||
if (ret)
|
||||
goto err2;
|
||||
|
||||
/* Return happy */
|
||||
return 0;
|
||||
|
||||
err2:
|
||||
iounmap(cmx270_nand_io);
|
||||
err1:
|
||||
kfree(cmx270_nand_mtd);
|
||||
|
||||
return ret;
|
||||
|
||||
}
|
||||
module_init(cmx270_init);
|
||||
|
||||
/*
|
||||
* Clean up routine
|
||||
*/
|
||||
static void cmx270_cleanup(void)
|
||||
{
|
||||
/* Release resources, unregister device */
|
||||
nand_release(cmx270_nand_mtd);
|
||||
|
||||
iounmap(cmx270_nand_io);
|
||||
|
||||
/* Free the MTD device structure */
|
||||
kfree (cmx270_nand_mtd);
|
||||
}
|
||||
module_exit(cmx270_cleanup);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
|
||||
MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");
|
Loading…
Reference in a new issue