/*
* 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");
