[PATCH] Samsung SoCs: OneNAND support
Makhija, Neha (IE10)
Neha.Makhija at Honeywell.com
Fri Sep 18 08:11:51 EDT 2009
Hi
I am also facing problem with the NAND Driver. I have a board with
Samsung NAND Flash (part number series K9F56). And On this Kernel 2.6.10
was ported. This board takes 110 seconds to boot up and come to the
application.
Due to some reason the Samsung NAND Flash was replaced with the ST Micro
NAND Flash (part number series NAND256). Now board takes 180 seconds to
boot up to the application. The Kernel image remains the same.
To test the ST micro NAND Flash - A stand alone code was written which
will continuously read the NAND Pages. Same code was run on both ST
Micro and Samsung board. Time taken by both boards was same. This shows
that there is no problem with the hardware.
The team is suspecting the kernel code. Looks like, kernel is getting
into the loop and is taking time to come out of it.
Is there a way to find out what is causing the 70 seconds delay.
Thanks in advance for the help!
Regards,
Neha
-----Original Message-----
From: linux-mtd-bounces at lists.infradead.org
[mailto:linux-mtd-bounces at lists.infradead.org] On Behalf Of Kyungmin
Park
Sent: Thursday, September 17, 2009 1:47 PM
To: linux-arm-kernel at lists.infradead.org
Cc: linux-mtd at lists.infradead.org
Subject: [PATCH] Samsung SoCs: OneNAND support
S3C64XX, S5PC1XX series OneNAND driver support
S3C6400, S3C6410, and S5PC100 use own OneNAND controller by AHB bus
BTW, S5PC110 use generic OneNAND APIs.
This is based on Samsung SoCs cpu detection.
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
diff --git a/arch/arm/plat-s3c/include/plat/regs-onenand.h
b/arch/arm/plat-s3c/include/plat/regs-onenand.h
new file mode 100644
index 0000000..943b51c
--- /dev/null
+++ b/arch/arm/plat-s3c/include/plat/regs-onenand.h
@@ -0,0 +1,75 @@
+/*
+ * linux/arch/arm/plat-s3c/include/plat/regs-onenand.h
+ *
+ * Copyright (C) 2008-2009 Samsung Electronics
+ * Kyungmin Park <kyungmin.park at samsung.com>
+ *
+ * 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.
+ */
+#ifndef __SAMSUNG_ONENAND_H__
+#define __SAMSUNG_ONENAND_H__
+
+#include <mach/hardware.h>
+
+/*
+ * OneNAND Controller
+ */
+#define S3C64XX_ONENAND0_BASE 0x70100000
+#define S3C64XX_ONENAND1_BASE 0x70200000
+#define S5PC100_ONENAND_BASE 0xE7100000
+#define S5PC110_ONENAND_BASE 0xB0000000
+
+#ifdef CONFIG_ARCH_S3C64XX
+#define SAMSUNG_ONENAND_BASE S3C64XX_ONENAND0_BASE
+#endif
+#ifdef CONFIG_ARCH_S5PC1XX
+#define SAMSUNG_ONENAND_BASE S5PC100_ONENAND_BASE
+#endif
+
+#define MEM_CFG_OFFSET 0x0000
+#define BURST_LEN_OFFSET 0x0010
+#define MEM_RESET_OFFSET 0x0020
+#define INT_ERR_STAT_OFFSET 0x0030
+#define INT_ERR_MASK_OFFSET 0x0040
+#define INT_ERR_ACK_OFFSET 0x0050
+#define ECC_ERR_STAT_OFFSET 0x0060
+#define MANUFACT_ID_OFFSET 0x0070
+#define DEVICE_ID_OFFSET 0x0080
+#define DATA_BUF_SIZE_OFFSET 0x0090
+#define BOOT_BUF_SIZE_OFFSET 0x00A0
+#define BUF_AMOUNT_OFFSET 0x00B0
+#define TECH_OFFSET 0x00C0
+#define FBA_WIDTH_OFFSET 0x00D0
+#define FPA_WIDTH_OFFSET 0x00E0
+#define FSA_WIDTH_OFFSET 0x00F0
+#define TRANS_SPARE_OFFSET 0x0140
+#define DBS_DFS_WIDTH_OFFSET 0x0160
+#define INT_PIN_ENABLE_OFFSET 0x01A0
+#define ACC_CLOCK_OFFSET 0x01C0
+#define FLASH_VER_ID_OFFSET 0x01F0
+#define FLASH_AUX_CNTRL_OFFSET 0x0300 /* s3c64xx only */
+
+#define ONENAND_MEM_RESET_HOT 0x3
+#define ONENAND_MEM_RESET_COLD 0x2
+#define ONENAND_MEM_RESET_WARM 0x1
+
+#define CACHE_OP_ERR (1 << 13)
+#define RST_CMP (1 << 12)
+#define RDY_ACT (1 << 11)
+#define INT_ACT (1 << 10)
+#define UNSUP_CMD (1 << 9)
+#define LOCKED_BLK (1 << 8)
+#define BLK_RW_CMP (1 << 7)
+#define ERS_CMP (1 << 6)
+#define PGM_CMP (1 << 5)
+#define LOAD_CMP (1 << 4)
+#define ERS_FAIL (1 << 3)
+#define PGM_FAIL (1 << 2)
+#define INT_TO (1 << 1)
+#define LD_FAIL_ECC_ERR (1 << 0)
+
+#define TSRF (1 << 0)
+
+#endif
diff --git a/drivers/mtd/onenand/Kconfig b/drivers/mtd/onenand/Kconfig
index 79fa79e..74ad1a9 100644
--- a/drivers/mtd/onenand/Kconfig
+++ b/drivers/mtd/onenand/Kconfig
@@ -34,6 +34,13 @@ config MTD_ONENAND_OMAP2
Support for a OneNAND flash device connected to an OMAP2/OMAP3
CPU
via the GPMC memory controller.
+config MTD_ONENAND_SAMSUNG
+ tristate "OneNAND on Samsung SOC controller support"
+ depends on MTD_ONENAND && (ARCH_S3C64XX || ARCH_S5PC1XX)
+ help
+ Support for a OneNAND flash device connected to an Samsung
SOC
+ S3C64XX/S5PC1XX controller.
+
config MTD_ONENAND_OTP
bool "OneNAND OTP Support"
select HAVE_MTD_OTP
diff --git a/drivers/mtd/onenand/Makefile b/drivers/mtd/onenand/Makefile
index 64b6cc6..2b7884c 100644
--- a/drivers/mtd/onenand/Makefile
+++ b/drivers/mtd/onenand/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_MTD_ONENAND) += onenand.o
# Board specific.
obj-$(CONFIG_MTD_ONENAND_GENERIC) += generic.o
obj-$(CONFIG_MTD_ONENAND_OMAP2) += omap2.o
+obj-$(CONFIG_MTD_ONENAND_SAMSUNG) += samsung.o
# Simulator
obj-$(CONFIG_MTD_ONENAND_SIM) += onenand_sim.o
diff --git a/drivers/mtd/onenand/samsung.c
b/drivers/mtd/onenand/samsung.c
new file mode 100644
index 0000000..8c4204d
--- /dev/null
+++ b/drivers/mtd/onenand/samsung.c
@@ -0,0 +1,835 @@
+/*
+ * S3C64XX/S5PC1XX OneNAND driver
+ *
+ * Copyright (C) 2008-2009 Samsung Electronics
+ * Kyungmin Park <kyungmin.park at samsung.com>
+ *
+ * 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.
+ *
+ * Implementation:
+ * Emulate the pseudo BufferRAM
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/onenand.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/mach/flash.h>
+#include <plat/regs-onenand.h>
+
+#include <asm/io.h>
+
+#include <mach/cpu.h>
+
+#ifdef SAMSUNG_DEBUG
+#define DPRINTK(format, args...)
\
+do {
\
+ printk("%s[%d]: " format "\n", __func__, __LINE__, ##args);
\
+} while (0)
+#else
+#define DPRINTK(...) do { } while (0)
+#endif
+
+#define S3C64XX_AHB_ADDR 0x20000000
+#define S5PC100_AHB_ADDR 0xB0000000
+
+#define ONENAND_ERASE_STATUS 0x00
+#define ONENAND_MULTI_ERASE_SET 0x01
+#define ONENAND_ERASE_START 0x03
+#define ONENAND_UNLOCK_START 0x08
+#define ONENAND_UNLOCK_END 0x09
+#define ONENAND_LOCK_START 0x0A
+#define ONENAND_LOCK_END 0x0B
+#define ONENAND_LOCK_TIGHT_START 0x0C
+#define ONENAND_LOCK_TIGHT_END 0x0D
+#define ONENAND_UNLOCK_ALL 0x0E
+#define ONENAND_OTP_ACCESS 0x12
+#define ONENAND_SPARE_ACCESS_ONLY 0x13
+#define ONENAND_MAIN_ACCESS_ONLY 0x14
+#define ONENAND_ERASE_VERIFY 0x15
+#define ONENAND_MAIN_SPARE_ACCESS 0x16
+#define ONENAND_PIPELINE_READ 0x4000
+
+#if defined(CONFIG_ARCH_S3C64XX)
+#define MAP_00 (0x0 << 24)
+#define MAP_01 (0x1 << 24)
+#define MAP_10 (0x2 << 24)
+#define MAP_11 (0x3 << 24)
+#elif defined(CONFIG_ARCH_S5PC1XX)
+#define MAP_00 (0x0 << 26)
+#define MAP_01 (0x1 << 26)
+#define MAP_10 (0x2 << 26)
+#define MAP_11 (0x3 << 26)
+#endif
+
+/* The 'addr' is byte address. It makes a 16-bit word */
+#define CMD_MAP_00(addr) (MAP_00 | ((addr) << 1))
+#define CMD_MAP_01(mem_addr) (MAP_01 | (mem_addr))
+#define CMD_MAP_10(mem_addr) (MAP_10 | (mem_addr))
+#define CMD_MAP_11(addr) (MAP_11 | ((addr) << 2))
+
+#define S3C6400_FBA_SHIFT 10
+#define S3C6400_FPA_SHIFT 4
+#define S3C6400_FSA_SHIFT 2
+
+#define S3C6410_FBA_SHIFT 12
+#define S3C6410_FPA_SHIFT 6
+#define S3C6410_FSA_SHIFT 4
+
+#define S5PC100_FBA_SHIFT 13
+#define S5PC100_FPA_SHIFT 7
+#define S5PC100_FSA_SHIFT 5
+
+struct s3c_onenand {
+ struct mtd_info *mtd;
+ void __iomem *base;
+ void __iomem *ahb_addr;
+ int bootram_command;
+ void __iomem *page_buf;
+ void __iomem *oob_buf;
+ unsigned int (*mem_addr)(int fba, int fpa, int fsa);
+#ifdef CONFIG_MTD_PARTITIONS
+ struct mtd_partition *parts;
+#endif
+};
+
+static struct s3c_onenand *onenand;
+
+#ifdef CONFIG_MTD_PARTITIONS
+static const char *part_probes[] = { "cmdlinepart", NULL, };
+#endif
+
+static int s3c_read_reg(int offset)
+{
+ return readl(onenand->base + offset);
+}
+
+static void s3c_write_reg(int value, int offset)
+{
+ writel(value, onenand->base + offset);
+}
+
+static int s3c_read_cmd(unsigned int cmd)
+{
+ return readl(onenand->ahb_addr + cmd);
+}
+
+static void s3c_write_cmd(int value, unsigned int cmd)
+{
+ writel(value, onenand->ahb_addr + cmd);
+}
+
+#ifdef SAMSUNG_DEBUG
+static void s3c_dump_reg(void)
+{
+ int i;
+
+ for (i = 0; i < 0x400; i += 0x40) {
+ printk("0x%08X: 0x%08x 0x%08x 0x%08x 0x%08x\n",
+ (unsigned int) onenand->base + i,
+ s3c_read_reg(i), s3c_read_reg(i + 0x10),
+ s3c_read_reg(i + 0x20), s3c_read_reg(i + 0x30));
+ }
+}
+#endif
+
+static unsigned int s3c6400_mem_addr(int fba, int fpa, int fsa)
+{
+ return (fba << S3C6400_FBA_SHIFT) | (fpa << S3C6400_FPA_SHIFT) |
+ (fsa << S3C6400_FSA_SHIFT);
+}
+
+static unsigned int s3c6410_mem_addr(int fba, int fpa, int fsa)
+{
+ return (fba << S3C6410_FBA_SHIFT) | (fpa << S3C6410_FPA_SHIFT) |
+ (fsa << S3C6410_FSA_SHIFT);
+}
+
+static unsigned int s5pc100_mem_addr(int fba, int fpa, int fsa)
+{
+ return (fba << S5PC100_FBA_SHIFT) | (fpa << S5PC100_FPA_SHIFT) |
+ (fsa << S5PC100_FSA_SHIFT);
+}
+
+static void s3c_onenand_reset(void)
+{
+ unsigned long timeout = 0x10000;
+ int stat;
+
+ s3c_write_reg(ONENAND_MEM_RESET_COLD, MEM_RESET_OFFSET);
+ while (1 && timeout--) {
+ stat = s3c_read_reg(INT_ERR_STAT_OFFSET);
+ if (stat & RST_CMP)
+ break;
+ }
+ stat = s3c_read_reg(INT_ERR_STAT_OFFSET);
+ s3c_write_reg(stat, INT_ERR_ACK_OFFSET);
+
+ /* Clear interrupt */
+ s3c_write_reg(0x0, INT_ERR_ACK_OFFSET);
+ /* Clear the ECC status */
+ s3c_write_reg(0x0, ECC_ERR_STAT_OFFSET);
+}
+
+static unsigned short s3c_onenand_readw(void __iomem * addr)
+{
+ struct onenand_chip *this = onenand->mtd->priv;
+ int reg = addr - this->base;
+ int word_addr = reg >> 1;
+ int value;
+
+ /* It's used for probing time */
+ switch (reg) {
+ case ONENAND_REG_MANUFACTURER_ID:
+ return s3c_read_reg(MANUFACT_ID_OFFSET);
+ case ONENAND_REG_DEVICE_ID:
+ return s3c_read_reg(DEVICE_ID_OFFSET);
+ case ONENAND_REG_VERSION_ID:
+ return s3c_read_reg(FLASH_VER_ID_OFFSET);
+ case ONENAND_REG_DATA_BUFFER_SIZE:
+ return s3c_read_reg(DATA_BUF_SIZE_OFFSET);
+ case ONENAND_REG_TECHNOLOGY:
+ return s3c_read_reg(TECH_OFFSET);
+ case ONENAND_REG_SYS_CFG1:
+ return s3c_read_reg(MEM_CFG_OFFSET);
+
+ /* Used at unlock all status */
+ case ONENAND_REG_CTRL_STATUS:
+ return 0;
+
+ case ONENAND_REG_WP_STATUS:
+ return ONENAND_WP_US;
+
+ default:
+ break;
+ }
+
+ /* BootRAM access control */
+ if ((unsigned int) addr < ONENAND_DATARAM &&
onenand->bootram_command) {
+ if (word_addr == 0)
+ return s3c_read_reg(MANUFACT_ID_OFFSET);
+ if (word_addr == 1)
+ return s3c_read_reg(DEVICE_ID_OFFSET);
+ if (word_addr == 2)
+ return s3c_read_reg(FLASH_VER_ID_OFFSET);
+ }
+
+ value = s3c_read_cmd(CMD_MAP_11(word_addr)) & 0xffff;
+ printk(KERN_INFO "s3c_onenand_readw: Illegal access"
+ " at reg 0x%x, value 0x%x\n", word_addr, value);
+ return value;
+}
+
+static void s3c_onenand_writew(unsigned short value, void __iomem *
addr)
+{
+ struct onenand_chip *this = onenand->mtd->priv;
+ int reg = addr - this->base;
+ int word_addr = reg >> 1;
+
+ /* It's used for probing time */
+ switch (reg) {
+ case ONENAND_REG_SYS_CFG1:
+ s3c_write_reg(value, MEM_CFG_OFFSET);
+ return;
+
+ case ONENAND_REG_START_ADDRESS1:
+ case ONENAND_REG_START_ADDRESS2:
+ return;
+
+ /* Lock/lock-tight/unlock/unlock_all */
+ case ONENAND_REG_START_BLOCK_ADDRESS:
+ return;
+
+ default:
+ break;
+ }
+
+ /* BootRAM access control */
+ if ((unsigned int) addr < ONENAND_DATARAM) {
+ if (value == ONENAND_CMD_READID) {
+ onenand->bootram_command = 1;
+ return;
+ }
+ if (value == ONENAND_CMD_RESET) {
+ s3c_write_reg(ONENAND_MEM_RESET_COLD,
MEM_RESET_OFFSET);
+ onenand->bootram_command = 0;
+ return;
+ }
+ }
+
+ printk(KERN_INFO "s3c_onenand_writew: Illegal access"
+ " at reg 0x%x, value 0x%x\n", word_addr, value);
+
+ s3c_write_cmd(value, CMD_MAP_11(word_addr));
+}
+
+static int s3c_onenand_wait(struct mtd_info *mtd, int state)
+{
+ unsigned int flags = INT_ACT;
+ unsigned int stat, ecc;
+ unsigned long timeout;
+
+ switch (state) {
+ case FL_READING:
+ flags |= BLK_RW_CMP | LOAD_CMP;
+ break;
+ case FL_WRITING:
+ flags |= BLK_RW_CMP | PGM_CMP;
+ break;
+ case FL_ERASING:
+ flags |= BLK_RW_CMP | ERS_CMP;
+ break;
+ case FL_LOCKING:
+ flags |= BLK_RW_CMP;
+ break;
+ default:
+ break;
+ }
+
+ /* The 20 msec is enough */
+ timeout = jiffies + msecs_to_jiffies(20);
+ while (time_before(jiffies, timeout)) {
+ stat = s3c_read_reg(INT_ERR_STAT_OFFSET);
+ if (stat & flags)
+ break;
+
+ if (state != FL_READING)
+ cond_resched();
+ }
+ /* To get correct interrupt status in timeout case */
+ stat = s3c_read_reg(INT_ERR_STAT_OFFSET);
+ s3c_write_reg(stat, INT_ERR_ACK_OFFSET);
+
+ /*
+ *
+ * In the Spec. it checks the controller status first
+ * However if you get the correct information in case of
+ * power off recovery (POR) test, it should read ECC status
first
+ */
+ if (stat & LOAD_CMP) {
+ ecc = s3c_read_reg(ECC_ERR_STAT_OFFSET);
+ if (ecc & ONENAND_ECC_4BIT_UNCORRECTABLE) {
+ printk(KERN_INFO "onenand_wait: ECC error =
0x%04x\n", ecc);
+ mtd->ecc_stats.failed++;
+ return -EBADMSG;
+ }
+ }
+
+ if (stat & (LOCKED_BLK | ERS_FAIL | PGM_FAIL | LD_FAIL_ECC_ERR))
{
+ printk(KERN_INFO "s3c_onenand_wait: controller error =
0x%04x\n", stat);
+ if (stat & LOCKED_BLK)
+ printk(KERN_INFO "s3c_onenand_wait: it's locked
error = 0x%04x\n", stat);
+
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int s3c_onenand_command(struct mtd_info *mtd, int cmd, loff_t
addr,
+ size_t len)
+{
+ struct onenand_chip *this = mtd->priv;
+ unsigned int *m, *s;
+ int fba, fpa, fsa = 0;
+ unsigned int mem_addr;
+ int i, mcount, scount;
+ int index;
+
+ fba = (int) (addr >> this->erase_shift);
+ fpa = (int) (addr >> this->page_shift);
+ fpa &= this->page_mask;
+
+ mem_addr = onenand->mem_addr(fba, fpa, fsa);
+
+ switch (cmd) {
+ case ONENAND_CMD_READ:
+ case ONENAND_CMD_READOOB:
+ case ONENAND_CMD_BUFFERRAM:
+ ONENAND_SET_NEXT_BUFFERRAM(this);
+ default:
+ break;
+ }
+
+ index = ONENAND_CURRENT_BUFFERRAM(this);
+
+ /*
+ * Emulate Two BufferRAMs and access with 4 bytes pointer
+ */
+ m = (unsigned int *) onenand->page_buf;
+ s = (unsigned int *) onenand->oob_buf;
+
+ if (index) {
+ m += (this->writesize >> 2);
+ s += (mtd->oobsize >> 2);
+ }
+
+ mcount = mtd->writesize >> 2;
+ scount = mtd->oobsize >> 2;
+
+ switch (cmd) {
+ case ONENAND_CMD_READ:
+ /* Main */
+ for (i = 0; i < mcount; i++)
+ *m++ = s3c_read_cmd(CMD_MAP_01(mem_addr));
+ return 0;
+
+ case ONENAND_CMD_READOOB:
+ s3c_write_reg(TSRF, TRANS_SPARE_OFFSET);
+ /* Main */
+ for (i = 0; i < mcount; i++)
+ *m++ = s3c_read_cmd(CMD_MAP_01(mem_addr));
+
+ /* Spare */
+ for (i = 0; i < scount; i++)
+ *s++ = s3c_read_cmd(CMD_MAP_01(mem_addr));
+
+ s3c_write_reg(0, TRANS_SPARE_OFFSET);
+ return 0;
+
+ case ONENAND_CMD_PROG:
+ /* Main */
+ for (i = 0; i < mcount; i++)
+ s3c_write_cmd(*m++, CMD_MAP_01(mem_addr));
+ return 0;
+
+ case ONENAND_CMD_PROGOOB:
+ s3c_write_reg(TSRF, TRANS_SPARE_OFFSET);
+
+ /* Main - dummy write */
+ for (i = 0; i < mcount; i++)
+ s3c_write_cmd(0xffffffff, CMD_MAP_01(mem_addr));
+
+ /* Spare */
+ for (i = 0; i < scount; i++)
+ s3c_write_cmd(*s++, CMD_MAP_01(mem_addr));
+
+ s3c_write_reg(0, TRANS_SPARE_OFFSET);
+ return 0;
+
+ case ONENAND_CMD_UNLOCK_ALL:
+ s3c_write_cmd(ONENAND_UNLOCK_ALL, CMD_MAP_10(mem_addr));
+ return 0;
+
+ case ONENAND_CMD_ERASE:
+ s3c_write_cmd(ONENAND_ERASE_START,
CMD_MAP_10(mem_addr));
+ return 0;
+
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static unsigned char *s3c_get_bufferram(struct mtd_info *mtd, int area)
+{
+ struct onenand_chip *this = mtd->priv;
+ int index = ONENAND_CURRENT_BUFFERRAM(this);
+ unsigned char *p;
+
+ if (area == ONENAND_DATARAM) {
+ p = (unsigned char *) onenand->page_buf;
+ if (index == 1)
+ p += this->writesize;
+ } else {
+ p = (unsigned char *) onenand->oob_buf;
+ if (index == 1)
+ p += mtd->oobsize;
+ }
+
+ return p;
+}
+
+static int onenand_read_bufferram(struct mtd_info *mtd, int area,
+ unsigned char *buffer, int offset,
+ size_t count)
+{
+ unsigned char *p;
+
+ p = s3c_get_bufferram(mtd, area);
+ memcpy(buffer, p + offset, count);
+ return 0;
+}
+
+static int onenand_write_bufferram(struct mtd_info *mtd, int area,
+ const unsigned char *buffer, int
offset,
+ size_t count)
+{
+ unsigned char *p;
+
+ p = s3c_get_bufferram(mtd, area);
+ memcpy(p + offset, buffer, count);
+ return 0;
+}
+
+static int s5pc110_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;
+ void __iomem *p;
+
+ p = bufferram = this->base + area;
+ if (ONENAND_CURRENT_BUFFERRAM(this)) {
+ if (area == ONENAND_DATARAM)
+ p += this->writesize;
+ else
+ p += mtd->oobsize;
+ }
+
+ if (count != mtd->writesize) {
+ /* Copy the bufferram to memory to prevent unaligned
access */
+ memcpy(this->page_buf, bufferram, mtd->writesize);
+ p = this->page_buf + offset;
+ }
+
+ memcpy(buffer, p, count);
+
+ return 0;
+}
+
+static int s3c_onenand_bbt_wait(struct mtd_info *mtd, int state)
+{
+ unsigned int flags = INT_ACT | LOAD_CMP;
+ unsigned int stat;
+ unsigned long timeout;
+
+ /* The 20 msec is enough */
+ timeout = jiffies + msecs_to_jiffies(20);
+ while (time_before(jiffies, timeout)) {
+ stat = s3c_read_reg(INT_ERR_STAT_OFFSET);
+ if (stat & flags)
+ break;
+ }
+ /* To get correct interrupt status in timeout case */
+ stat = s3c_read_reg(INT_ERR_STAT_OFFSET);
+ s3c_write_reg(stat, INT_ERR_ACK_OFFSET);
+
+ if (stat & LD_FAIL_ECC_ERR) {
+ s3c_onenand_reset();
+ return ONENAND_BBT_READ_ERROR;
+ }
+
+ if (stat & LOAD_CMP) {
+ int ecc = s3c_read_reg(ECC_ERR_STAT_OFFSET);
+ if (ecc & ONENAND_ECC_4BIT_UNCORRECTABLE) {
+ s3c_onenand_reset();
+ return ONENAND_BBT_READ_ERROR;
+ }
+ }
+
+ return 0;
+}
+
+static void s3c_onenand_check_lock_status(struct mtd_info *mtd)
+{
+ struct onenand_chip *this = mtd->priv;
+ unsigned int block, end;
+ int tmp;
+
+ end = this->chipsize >> this->erase_shift;
+
+ for (block = 0; block < end; block++) {
+ tmp = s3c_read_cmd(CMD_MAP_01(onenand->mem_addr(block,
0, 0)));
+
+ if (s3c_read_reg(INT_ERR_STAT_OFFSET) & LOCKED_BLK) {
+ printk("block %d is write-protected!\n", block);
+ s3c_write_reg(LOCKED_BLK, INT_ERR_ACK_OFFSET);
+ }
+ }
+}
+
+static void s3c_onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs,
size_t len, int cmd)
+{
+ struct onenand_chip *this = mtd->priv;
+ int start, end, start_mem_addr, end_mem_addr;
+
+ start = ofs >> this->erase_shift;
+ start_mem_addr = onenand->mem_addr(start, 0, 0);
+ end = start + (len >> this->erase_shift) - 1;
+ end_mem_addr = onenand->mem_addr(end, 0, 0);
+
+ if (cmd == ONENAND_CMD_LOCK) {
+ s3c_write_cmd(ONENAND_LOCK_START,
CMD_MAP_10(start_mem_addr));
+ s3c_write_cmd(ONENAND_LOCK_END,
CMD_MAP_10(end_mem_addr));
+ } else {
+ s3c_write_cmd(ONENAND_UNLOCK_START,
CMD_MAP_10(start_mem_addr));
+ s3c_write_cmd(ONENAND_UNLOCK_END,
CMD_MAP_10(end_mem_addr));
+ }
+
+ this->wait(mtd, FL_LOCKING);
+}
+
+static void s3c_unlock_all(struct mtd_info *mtd)
+{
+ struct onenand_chip *this = mtd->priv;
+ loff_t ofs = 0;
+ size_t len = this->chipsize;
+
+ if (this->options & ONENAND_HAS_UNLOCK_ALL) {
+ /* Write unlock command */
+ this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
+
+ /* No need to check return value */
+ this->wait(mtd, FL_LOCKING);
+
+ /* Workaround for all block unlock in DDP */
+ if (!ONENAND_IS_DDP(this)) {
+ s3c_onenand_check_lock_status(mtd);
+ return;
+ }
+
+ /* All blocks on another chip */
+ ofs = this->chipsize >> 1;
+ len = this->chipsize >> 1;
+ }
+
+ s3c_onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
+
+ s3c_onenand_check_lock_status(mtd);
+}
+
+static void s3c_onenand_setup(struct mtd_info *mtd)
+{
+ struct onenand_chip *this = mtd->priv;
+
+ onenand->mtd = mtd;
+
+ if (cpu_is_s3c6400())
+ onenand->mem_addr = s3c6400_mem_addr;
+ if (cpu_is_s3c6410())
+ onenand->mem_addr = s3c6410_mem_addr;
+ if (cpu_is_s5pc100())
+ onenand->mem_addr = s5pc100_mem_addr;
+ if (cpu_is_s5pc110()) {
+ /* Use generic onenand functions */
+ this->read_bufferram = s5pc110_read_bufferram;
+ return;
+ }
+
+ this->read_word = s3c_onenand_readw;
+ this->write_word = s3c_onenand_writew;
+
+ this->wait = s3c_onenand_wait;
+ this->bbt_wait = s3c_onenand_bbt_wait;
+ this->unlock_all = s3c_unlock_all;
+ this->command = s3c_onenand_command;
+
+ this->read_bufferram = onenand_read_bufferram;
+ this->write_bufferram = onenand_write_bufferram;
+}
+
+static int s3c_onenand_probe(struct platform_device *pdev)
+{
+ struct onenand_platform_data *pdata;
+ struct onenand_chip *this;
+ struct mtd_info *mtd;
+ struct resource *r;
+ int size, err;
+ unsigned long ahb_addr = 0, ahb_addr_size;
+
+ if (!(cpu_is_s3c64xx() || cpu_is_s5pc1xx()))
+ return -ENODEV;
+
+ pdata = pdev->dev.platform_data;
+ /* No need to check pdata. the platform data is optional */
+
+ size = sizeof(struct mtd_info) + sizeof(struct onenand_chip);
+ mtd = kzalloc(size, GFP_KERNEL);
+ if (!mtd) {
+ dev_err(&pdev->dev, "failed to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ onenand = kzalloc(sizeof(struct s3c_onenand), GFP_KERNEL);
+ if (!onenand) {
+ err = -ENOMEM;
+ goto onenand_fail;
+ }
+
+ this = (struct onenand_chip *) &mtd[1];
+ mtd->priv = this;
+ mtd->dev.parent = &pdev->dev;
+ mtd->owner = THIS_MODULE;
+
+ s3c_onenand_setup(mtd);
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r) {
+ dev_err(&pdev->dev, "no resource defined\n");
+ return -ENXIO;
+ goto resource_failed;
+ }
+
+ r = request_mem_region(r->start, resource_size(r), pdev->name);
+ if (!r) {
+ dev_err(&pdev->dev, "failed to request memory
resource\n");
+ err = -EBUSY;
+ goto request_failed;
+ }
+
+ onenand->base = ioremap(r->start, resource_size(r));
+ if (!onenand->base) {
+ err = -EFAULT;
+ goto ioremap_failed;
+ }
+ /* Set onenand_chip also */
+ this->base = onenand->base;
+
+ if (cpu_is_s3c64xx()) {
+ ahb_addr = S3C64XX_AHB_ADDR;
+ ahb_addr_size = SZ_64M;
+ } else if (cpu_is_s5pc100()) {
+ ahb_addr = S5PC100_AHB_ADDR;
+ ahb_addr_size = SZ_256M - SZ_32M;
+ }
+
+ /*
+ * We only used as followings
+ * S5PC100 S3C64XX
+ * MAP_01 0xB4000000 ~ 0xB4FFFFFF 0x21000000 ~ 0x21FFFFFF
+ * MAP_10 0xB8000000 ~ 0xB8FFFFFF 0x22000000 ~ 0x22FFFFFF
+ * MAP_11 0xBC000000 ~ 0xBCFFFFFF 0x23000000 ~ 0x23FFFFFF
+ */
+ if (ahb_addr) {
+ onenand->ahb_addr = ioremap(ahb_addr, ahb_addr_size);
+ if (!onenand->ahb_addr) {
+ err = -EINVAL;
+ goto ahb_failed;
+ }
+
+ /* Allocate 4KiB BufferRAM */
+ onenand->page_buf = kzalloc(SZ_4K * sizeof(char),
GFP_KERNEL);
+ if (!onenand->page_buf) {
+ err = -ENOMEM;
+ goto page_buf_fail;
+ }
+
+ /* Allocate 128 SpareRAM */
+ onenand->oob_buf = kzalloc(128 * sizeof(char),
GFP_KERNEL);
+ if (!onenand->oob_buf) {
+ err = -ENOMEM;
+ goto oob_buf_fail;
+ }
+ }
+
+ if (onenand_scan(mtd, 1)) {
+ err = -EFAULT;
+ goto scan_failed;
+ }
+
+ if (ahb_addr) {
+ /* S3C don't handle subpage write */
+ mtd->subpage_sft = 0;
+ this->subpagesize = mtd->writesize;
+ }
+
+ if (s3c_read_reg(MEM_CFG_OFFSET) & ONENAND_SYS_CFG1_SYNC_READ)
+ printk(KERN_INFO "OneNAND Sync. Burst Read enabled\n");
+
+#ifdef CONFIG_MTD_PARTITIONS
+ err = parse_mtd_partitions(mtd, part_probes, &onenand->parts,
0);
+ if (err > 0)
+ add_mtd_partitions(mtd, onenand->parts, err);
+ else if (err <= 0 && pdata && pdata->parts)
+ add_mtd_partitions(mtd, pdata->parts, pdata->nr_parts);
+ else
+#endif
+ err = add_mtd_device(mtd);
+
+ platform_set_drvdata(pdev, mtd);
+
+ return 0;
+scan_failed:
+ kfree(onenand->oob_buf);
+oob_buf_fail:
+ kfree(onenand->page_buf);
+page_buf_fail:
+ if (onenand->ahb_addr)
+ iounmap(onenand->ahb_addr);
+ahb_failed:
+ iounmap(onenand->base);
+ioremap_failed:
+ release_mem_region(r->start, resource_size(r));
+request_failed:
+resource_failed:
+ kfree(onenand);
+onenand_fail:
+ kfree(mtd);
+ return err;
+}
+
+static int __devexit s3c_onenand_remove(struct platform_device *pdev)
+{
+ struct mtd_info *mtd = platform_get_drvdata(pdev);
+
+ onenand_release(mtd);
+ if (onenand->ahb_addr)
+ iounmap(onenand->ahb_addr);
+ iounmap(onenand->base);
+ platform_set_drvdata(pdev, NULL);
+ kfree(onenand->oob_buf);
+ kfree(onenand->page_buf);
+ kfree(onenand);
+ kfree(mtd);
+ return 0;
+}
+
+static int s3c_pm_ops_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct mtd_info *mtd = platform_get_drvdata(pdev);
+ struct onenand_chip *this = mtd->priv;
+
+ this->wait(mtd, FL_PM_SUSPENDED);
+ return mtd->suspend(mtd);
+}
+
+static int s3c_pm_ops_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct mtd_info *mtd = platform_get_drvdata(pdev);
+ struct onenand_chip *this = mtd->priv;
+
+ mtd->resume(mtd);
+ this->unlock_all(mtd);
+ return 0;
+}
+
+static struct dev_pm_ops s3c_pm_ops = {
+ .suspend = s3c_pm_ops_suspend,
+ .resume = s3c_pm_ops_resume,
+};
+
+static struct platform_driver s3c_onenand_driver = {
+ .driver = {
+ .name = "samsung-onenand",
+ .pm = &s3c_pm_ops,
+ },
+ .probe = s3c_onenand_probe,
+ .remove = __devexit_p(s3c_onenand_remove),
+};
+
+static int __init s3c_onenand_init(void)
+{
+ return platform_driver_register(&s3c_onenand_driver);
+}
+
+static void __exit s3c_onenand_exit(void)
+{
+ platform_driver_unregister(&s3c_onenand_driver);
+}
+
+module_init(s3c_onenand_init);
+module_exit(s3c_onenand_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park at samsung.com>");
+MODULE_DESCRIPTION("Samsung S3C64XX/S5PC1XX OneNAND controller
support");
+MODULE_ALIAS("platform:samsung-onenand");
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 8ed8733..e35909b 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -214,4 +214,14 @@ unsigned onenand_block(struct onenand_chip *this,
loff_t addr);
loff_t onenand_addr(struct onenand_chip *this, int block);
int flexonenand_region(struct mtd_info *mtd, loff_t addr);
+struct mtd_partition;
+
+struct onenand_platform_data {
+ void (*mmcontrol)(struct mtd_info *mtd, int
sync_read);
+ int (*read_bufferram)(struct mtd_info *mtd, int
area,
+ unsigned char *buffer, int offset, size_t
count);
+ struct mtd_partition *parts;
+ unsigned int nr_parts;
+};
+
#endif /* __LINUX_MTD_ONENAND_H */
diff --git a/include/linux/mtd/onenand_regs.h
b/include/linux/mtd/onenand_regs.h
index 86a6bbe..a69d140 100644
--- a/include/linux/mtd/onenand_regs.h
+++ b/include/linux/mtd/onenand_regs.h
@@ -206,6 +206,7 @@
#define ONENAND_ECC_1BIT_ALL (0x5555)
#define ONENAND_ECC_2BIT (1 << 1)
#define ONENAND_ECC_2BIT_ALL (0xAAAA)
+#define ONENAND_ECC_4BIT_UNCORRECTABLE (0x1010)
#define FLEXONENAND_UNCORRECTABLE_ERROR (0x1010)
/*
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