52b0eea73d
Add OneNAND Sync. Burst Read support Tested with OMAP platform Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
241 lines
5.8 KiB
C
241 lines
5.8 KiB
C
/*
|
|
* linux/drivers/mtd/onenand/omap-onenand.c
|
|
*
|
|
* Copyright (c) 2005 Samsung Electronics
|
|
* Kyungmin Park <kyungmin.park@samsung.com>
|
|
*
|
|
* Derived from linux/drivers/mtd/nand/omap-nand-flash.c
|
|
*
|
|
* 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 OneNAND flash device for TI OMAP boards.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/onenand.h>
|
|
#include <linux/mtd/partitions.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/arch/hardware.h>
|
|
#include <asm/arch/tc.h>
|
|
#include <asm/sizes.h>
|
|
#include <asm/mach-types.h>
|
|
|
|
#define OMAP_ONENAND_FLASH_START1 OMAP_CS2A_PHYS
|
|
#define OMAP_ONENAND_FLASH_START2 omap_cs3_phys()
|
|
/*
|
|
* MTD structure for OMAP board
|
|
*/
|
|
static struct mtd_info *omap_onenand_mtd = NULL;
|
|
|
|
/*
|
|
* Define partitions for flash devices
|
|
*/
|
|
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
static struct mtd_partition static_partition[] = {
|
|
{
|
|
.name = "X-Loader + U-Boot",
|
|
.offset = 0,
|
|
.size = SZ_128K,
|
|
.mask_flags = MTD_WRITEABLE /* force read-only */
|
|
},
|
|
{
|
|
.name = "U-Boot Environment",
|
|
.offset = MTDPART_OFS_APPEND,
|
|
.size = SZ_128K,
|
|
.mask_flags = MTD_WRITEABLE /* force read-only */
|
|
},
|
|
{
|
|
.name = "kernel",
|
|
.offset = MTDPART_OFS_APPEND,
|
|
.size = 2 * SZ_1M
|
|
},
|
|
{
|
|
.name = "filesystem0",
|
|
.offset = MTDPART_OFS_APPEND,
|
|
.size = SZ_16M,
|
|
},
|
|
{
|
|
.name = "filesystem1",
|
|
.offset = MTDPART_OFS_APPEND,
|
|
.size = MTDPART_SIZ_FULL,
|
|
},
|
|
};
|
|
|
|
static const char *part_probes[] = { "cmdlinepart", NULL, };
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_MTD_ONENAND_SYNC_READ
|
|
static unsigned int omap_emifs_cs;
|
|
|
|
static void omap_find_emifs_cs(unsigned int addr)
|
|
{
|
|
/* Check CS3 */
|
|
if (OMAP_EMIFS_CONFIG_REG & OMAP_EMIFS_CONFIG_BM && addr == 0x0) {
|
|
omap_emifs_cs = 3;
|
|
} else {
|
|
omap_emifs_cs = (addr >> 26);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* omap_onenand_mmcontrol - Control OMAP EMIFS
|
|
*/
|
|
static void omap_onenand_mmcontrol(struct mtd_info *mtd, int sync_read)
|
|
{
|
|
struct onenand_chip *this = mtd->priv;
|
|
static unsigned long omap_emifs_ccs, omap_emifs_acs;
|
|
static unsigned long onenand_sys_cfg1;
|
|
int config, emifs_ccs, emifs_acs;
|
|
|
|
if (sync_read) {
|
|
/*
|
|
* Note: BRL and RDWST is equal
|
|
*/
|
|
omap_emifs_ccs = EMIFS_CCS(omap_emifs_cs);
|
|
omap_emifs_acs = EMIFS_ACS(omap_emifs_cs);
|
|
|
|
emifs_ccs = 0x41141;
|
|
emifs_acs = 0x1;
|
|
|
|
/* OneNAND System Configuration 1 */
|
|
onenand_sys_cfg1 = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
|
|
config = (onenand_sys_cfg1
|
|
& ~(0x3f << ONENAND_SYS_CFG1_BL_SHIFT))
|
|
| ONENAND_SYS_CFG1_SYNC_READ
|
|
| ONENAND_SYS_CFG1_BRL_4
|
|
| ONENAND_SYS_CFG1_BL_8;
|
|
} else {
|
|
emifs_ccs = omap_emifs_ccs;
|
|
emifs_acs = omap_emifs_acs;
|
|
config = onenand_sys_cfg1;
|
|
}
|
|
|
|
this->write_word(config, this->base + ONENAND_REG_SYS_CFG1);
|
|
EMIFS_CCS(omap_emifs_cs) = emifs_ccs;
|
|
EMIFS_ACS(omap_emifs_cs) = emifs_acs;
|
|
}
|
|
#else
|
|
#define omap_find_emifs_cs(x) do { } while (0)
|
|
#define omap_onenand_mmcontrol NULL
|
|
#endif
|
|
|
|
|
|
/* Scan to find existance of the device at base.
|
|
This also allocates oob and data internal buffers */
|
|
static char onenand_name[] = "onenand";
|
|
|
|
/*
|
|
* Main initialization routine
|
|
*/
|
|
static int __init omap_onenand_init (void)
|
|
{
|
|
struct onenand_chip *this;
|
|
struct mtd_partition *dynamic_partition = 0;
|
|
int err = 0;
|
|
|
|
/* Allocate memory for MTD device structure and private data */
|
|
omap_onenand_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct onenand_chip),
|
|
GFP_KERNEL);
|
|
if (!omap_onenand_mtd) {
|
|
printk (KERN_WARNING "Unable to allocate OneNAND MTD device structure.\n");
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Get pointer to private data */
|
|
this = (struct onenand_chip *) (&omap_onenand_mtd[1]);
|
|
|
|
/* Initialize structures */
|
|
memset((char *) omap_onenand_mtd, 0, sizeof(struct mtd_info) + sizeof(struct onenand_chip));
|
|
|
|
/* Link the private data with the MTD structure */
|
|
omap_onenand_mtd->priv = this;
|
|
this->mmcontrol = omap_onenand_mmcontrol;
|
|
|
|
/* try the first address */
|
|
this->base = ioremap(OMAP_ONENAND_FLASH_START1, SZ_128K);
|
|
omap_find_emifs_cs(OMAP_ONENAND_FLASH_START1);
|
|
|
|
omap_onenand_mtd->name = onenand_name;
|
|
if (onenand_scan(omap_onenand_mtd, 1)){
|
|
/* try the second address */
|
|
iounmap(this->base);
|
|
this->base = ioremap(OMAP_ONENAND_FLASH_START2, SZ_128K);
|
|
omap_find_emifs_cs(OMAP_ONENAND_FLASH_START2);
|
|
|
|
if (onenand_scan(omap_onenand_mtd, 1)) {
|
|
iounmap(this->base);
|
|
err = -ENXIO;
|
|
goto out_mtd;
|
|
}
|
|
}
|
|
|
|
/* Register the partitions */
|
|
switch (omap_onenand_mtd->size) {
|
|
case SZ_128M:
|
|
case SZ_64M:
|
|
case SZ_32M:
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
err = parse_mtd_partitions(omap_onenand_mtd, part_probes,
|
|
&dynamic_partition, 0);
|
|
if (err > 0)
|
|
err = add_mtd_partitions(omap_onenand_mtd,
|
|
dynamic_partition, err);
|
|
else if (1)
|
|
err = add_mtd_partitions(omap_onenand_mtd,
|
|
static_partition,
|
|
ARRAY_SIZE(static_partition));
|
|
else
|
|
#endif
|
|
err = add_mtd_device(omap_onenand_mtd);
|
|
if (err)
|
|
goto out_buf;
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_WARNING "Unsupported OneNAND device\n");
|
|
err = -ENXIO;
|
|
goto out_buf;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_buf:
|
|
onenand_release(omap_onenand_mtd);
|
|
iounmap(this->base);
|
|
out_mtd:
|
|
kfree(omap_onenand_mtd);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Clean up routine
|
|
*/
|
|
static void __exit omap_onenand_cleanup (void)
|
|
{
|
|
struct onenand_chip *this = omap_onenand_mtd->priv;
|
|
|
|
/* onenand_release frees MTD partitions, MTD structure
|
|
and onenand internal buffers */
|
|
onenand_release(omap_onenand_mtd);
|
|
iounmap(this->base);
|
|
kfree(omap_onenand_mtd);
|
|
}
|
|
|
|
module_init(omap_onenand_init);
|
|
module_exit(omap_onenand_cleanup);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
|
|
MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP boards");
|