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[PATCH] OneNAND: Sync. Burst Read support 

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>
This commit is contained in:
Kyungmin Park 2005-09-03 07:07:19 +01:00 committed by Thomas Gleixner
parent cd5f6346bc
commit 52b0eea73d
5 changed files with 123 additions and 6 deletions
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6
drivers/mtd/onenand/Kconfig
View File

@ -29,4 +29,10 @@ config MTD_ONENAND_OMAP
help
Support for OneNAND flash on TI OMAP board.
config MTD_ONENAND_SYNC_READ
bool "OneNAND Sync. Burst Read Support"
depends on ARCH_OMAP
help
This enables support for Sync. Burst Read.
endmenu

66
drivers/mtd/onenand/omap-onenand.c
View File

@ -25,9 +25,10 @@
#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_CS0_PHYS
#define OMAP_ONENAND_FLASH_START2 omap_cs3_phys()
/*
* MTD structure for OMAP board
*/
@ -68,10 +69,66 @@ static struct mtd_partition static_partition[] = {
},
};
const char *part_probes[] = { "cmdlinepart", NULL, };
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";
@ -102,14 +159,19 @@ static int __init omap_onenand_init (void)
/* 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;

39
drivers/mtd/onenand/onenand_base.c
View File

@ -378,6 +378,35 @@ static int onenand_read_bufferram(struct mtd_info *mtd, int area,
return 0;
}
/**
* onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
* @param mtd MTD data structure
* @param area BufferRAM area
* @param buffer the databuffer to put/get data
* @param offset offset to read from or write to
* @param count number of bytes to read/write
*
* Read the BufferRAM area with Sync. Burst Mode
*/
static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
unsigned char *buffer, int offset, size_t count)
{
struct onenand_chip *this = mtd->priv;
void __iomem *bufferram;
bufferram = this->base + area;
bufferram += onenand_bufferram_offset(mtd, area);
this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
memcpy(buffer, bufferram + offset, count);
this->mmcontrol(mtd, 0);
return 0;
}
/**
* onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
* @param mtd MTD data structure
@ -1273,8 +1302,8 @@ static int onenand_check_maf(int manuf)
break;
}
printk(KERN_DEBUG "OneNAND Manufacturer: %s\n",
onenand_manuf_ids[i].name);
printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n",
onenand_manuf_ids[i].name, manuf);
return (i != ONENAND_MFR_UNKNOWN);
}
@ -1385,6 +1414,12 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
if (onenand_probe(mtd))
return -ENXIO;
/* Set Sync. Burst Read after probing */
if (this->mmcontrol) {
printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
this->read_bufferram = onenand_sync_read_bufferram;
}
this->state = FL_READY;
init_waitqueue_head(&this->wq);
spin_lock_init(&this->chip_lock);

1
include/linux/mtd/onenand.h
View File

@ -95,6 +95,7 @@ struct onenand_chip {
const unsigned char *buffer, int offset, size_t count);
unsigned short (*read_word)(void __iomem *addr);
void (*write_word)(unsigned short value, void __iomem *addr);
void (*mmcontrol)(struct mtd_info *mtd, int sync_read);
spinlock_t chip_lock;
wait_queue_head_t wq;

17
include/linux/mtd/onenand_regs.h
View File

@ -121,8 +121,21 @@
* System Configuration 1 Register F221h (R, R/W)
*/
#define ONENAND_SYS_CFG1_SYNC_READ (1 << 15)
#define ONENAND_SYS_CFG1_BRL (1 << 12)
#define ONENAND_SYS_CFG1_BL (1 << 9)
#define ONENAND_SYS_CFG1_BRL_7 (7 << 12)
#define ONENAND_SYS_CFG1_BRL_6 (6 << 12)
#define ONENAND_SYS_CFG1_BRL_5 (5 << 12)
#define ONENAND_SYS_CFG1_BRL_4 (4 << 12)
#define ONENAND_SYS_CFG1_BRL_3 (3 << 12)
#define ONENAND_SYS_CFG1_BRL_10 (2 << 12)
#define ONENAND_SYS_CFG1_BRL_9 (1 << 12)
#define ONENAND_SYS_CFG1_BRL_8 (0 << 12)
#define ONENAND_SYS_CFG1_BRL_SHIFT (12)
#define ONENAND_SYS_CFG1_BL_32 (4 << 9)
#define ONENAND_SYS_CFG1_BL_16 (3 << 9)
#define ONENAND_SYS_CFG1_BL_8 (2 << 9)
#define ONENAND_SYS_CFG1_BL_4 (1 << 9)
#define ONENAND_SYS_CFG1_BL_CONT (0 << 9)
#define ONENAND_SYS_CFG1_BL_SHIFT (9)
#define ONENAND_SYS_CFG1_NO_ECC (1 << 8)
#define ONENAND_SYS_CFG1_RDY (1 << 7)
#define ONENAND_SYS_CFG1_INT (1 << 6)