600 lines
16 KiB
Diff
600 lines
16 KiB
Diff
Index: linux-2.6.17/drivers/mtd/nand/cm-x270.c
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===================================================================
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--- linux-2.6.17.orig/drivers/mtd/nand/cm-x270.c 2006-07-18 15:40:10.000000000 +0100
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+++ linux-2.6.17/drivers/mtd/nand/cm-x270.c 2006-07-19 15:35:18.000000000 +0100
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@@ -1,7 +1,13 @@
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/*
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- * drivers/mtd/nand/cm-x270.c
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+ * linux/drivers/mtd/nand/cmx270-nand.c
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+ *
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+ * Copyright (C) 2006 Compulab, Ltd.
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+ * Mike Rapoport <mike@compulab.co.il>
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+ *
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+ * Derived from drivers/mtd/nand/h1910.c
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+ * Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
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+ * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
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*
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- * Copyright (c) 2006, 8D Technologies inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@@ -9,397 +15,269 @@
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*
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* Overview:
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* This is a device driver for the NAND flash device found on the
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- * cm-x270 compulab SBC.
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- *
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- * Changelog:
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- * - April 2006, Raphael Assenat <raph@8d.com>:
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- * Creation of the driver.
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+ * CM-X270 board.
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*/
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-#include <linux/delay.h>
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+#include <linux/slab.h>
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+#include <linux/init.h>
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+#include <linux/module.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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-#include <asm/hardware.h>
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+
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#include <asm/io.h>
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+#include <asm/irq.h>
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+
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+#include <asm/arch/hardware.h>
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#include <asm/arch/pxa-regs.h>
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-#include <asm/arch/cm-x270.h>
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+#define GPIO_NAND_CS (11)
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+#define GPIO_NAND_RB (89)
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-static struct mtd_info *cmx270_mtd = NULL;
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-static void *cmx270_nand_io_base;
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-#define OFFSET_BASE 0
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-#define OFFSET_CLE 4
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-#define OFFSET_ALE 8
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-
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-#define DEFAULT_NUM_PARTITIONS 1
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-static int nr_partitions;
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-static struct mtd_partition cmx270_default_partition_info[] = {
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- {
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- .name = "rootfs",
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- .offset = 0,
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- .size = MTDPART_SIZ_FULL,
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- },
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-};
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+/* This macro needed to ensure in-order operation of GPIO and local
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+ * bus. Without both asm command and dummy uncached read there're
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+ * states when NAND access is broken. I've looked for such macro(s) in
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+ * include/asm-arm but found nothing approptiate.
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+ * dmac_clean_range is close, but is makes cache invalidation
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+ * unnecessary here and it cannot be used in module
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+ */
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+#define DRAIN_WB() \
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+ do { \
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+ unsigned char dummy; \
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+ asm volatile ("mcr p15, 0, r0, c7, c10, 4":::"r0"); \
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+ dummy=*((unsigned char*)UNCACHED_ADDR); \
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+ } while(0)
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-static void cmx270_nand_hwcontrol(struct mtd_info *mtd, int cmd)
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-{
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- udelay(1);
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- switch(cmd)
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+/* MTD structure for CM-X270 board */
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+static struct mtd_info *cmx270_nand_mtd;
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+
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+/* remaped IO address of the device */
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+static void __iomem *cmx270_nand_io;
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+
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+/*
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+ * Define static partitions for flash device
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+ */
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+static struct mtd_partition partition_info[] = {
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{
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- case NAND_CTL_SETNCE:
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- GPCR(CM_X270_GPIO_NAND_CS) = GPIO_bit(CM_X270_GPIO_NAND_CS);
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- break;
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- case NAND_CTL_CLRNCE:
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- GPSR(CM_X270_GPIO_NAND_CS) = GPIO_bit(CM_X270_GPIO_NAND_CS);
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- break;
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+ .name = "cmx270-0",
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+ .offset = 0,
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+ .size = MTDPART_SIZ_FULL
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}
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- udelay(1);
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-}
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-
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-static int cmx270_nand_device_ready(struct mtd_info *mtd)
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-{
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- /* I was getting ecc errors on reads, but adding this delay
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- made the problem disappear. There is probably a timing
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- issue somewhere. */
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- //ndelay (500);
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- udelay (25);
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+};
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+#define NUM_PARTITIONS (ARRAY_SIZE(partition_info))
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- return GPLR(CM_X270_GPIO_NAND_RB) & GPIO_bit(CM_X270_GPIO_NAND_RB);
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-}
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+const char *part_probes[] = { "cmdlinepart", NULL };
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-static u_char cmx270_nand_read_byte(struct mtd_info *mtd)
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+static u_char cmx270_read_byte(struct mtd_info *mtd)
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{
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struct nand_chip *this = mtd->priv;
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-// unsigned long raw = readl(this->IO_ADDR_R);
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- unsigned char res = ( readl(this->IO_ADDR_R) >> 16 ) & 0xff;
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- return res;
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-}
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-static void cmx270_nand_write_byte(struct mtd_info *mtd, u_char byte)
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-{
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- struct nand_chip *this = mtd->priv;
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- writel( (byte<<16), this->IO_ADDR_W );
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- udelay(1);
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+ return (readl(this->IO_ADDR_R) >> 16);
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}
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-static void cmx270_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
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+static void cmx270_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
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{
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int i;
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struct nand_chip *this = mtd->priv;
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for (i=0; i<len; i++)
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- writel((buf[i]<<16), this->IO_ADDR_W);
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- udelay(1);
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+ writel((*buf++ << 16), this->IO_ADDR_W);
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}
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-static void cmx270_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
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+static void cmx270_read_buf(struct mtd_info *mtd, u_char *buf, int len)
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{
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int i;
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struct nand_chip *this = mtd->priv;
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for (i=0; i<len; i++)
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- buf[i] = (readl(this->IO_ADDR_R) >> 16 ) & 0xff;
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- udelay(1);
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+ *buf++ = readl(this->IO_ADDR_R) >> 16;
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}
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-static int cmx270_nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
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+static int cmx270_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
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{
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int i;
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struct nand_chip *this = mtd->priv;
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for (i=0; i<len; i++)
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- if (buf[i] != ((readl(this->IO_ADDR_R) >> 16) & 0xff))
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+ if (buf[i] != (u_char)(readl(this->IO_ADDR_R) >> 16))
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return -EFAULT;
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- udelay(1);
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return 0;
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}
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-static void cmx270_nand_write_ALE(struct mtd_info *mtd, const u_char byte)
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+static inline void nand_cs_on(void)
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{
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- struct nand_chip *this = mtd->priv;
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- writel( byte << 16 , this->IO_ADDR_W + OFFSET_ALE);
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- udelay(1);
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+ GPCR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
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}
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-static void cmx270_nand_write_CLE(struct mtd_info *mtd, const u_char byte)
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+static void nand_cs_off(void)
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{
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- struct nand_chip *this = mtd->priv;
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- writel( byte << 16 , this->IO_ADDR_W + OFFSET_CLE);
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- udelay(1);
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+ DRAIN_WB();
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+
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+ GPSR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
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}
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-/* Same as nand_core:nand_command() but with different memory
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- * addresses for writing to ALE and CLE and without 16 bit support.
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+/*
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+ * hardware specific access to control-lines
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*/
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-static void cmx270_nand_command(struct mtd_info *mtd, unsigned command, int column, int page_addr)
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+static void cmx270_hwcontrol(struct mtd_info *mtd, int cmd)
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{
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- register struct nand_chip *this = mtd->priv;
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+ struct nand_chip* this = (struct nand_chip *) (mtd->priv);
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+ unsigned int nandaddr = (unsigned int)this->IO_ADDR_R;
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-// printk("cmd: 0x%02x col: 0x%x page_addr: 0x%x\n",
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-// command, column, page_addr);
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-
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- if (command == NAND_CMD_SEQIN) {
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- int readcmd;
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-
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- if (column >= mtd->oobblock) {
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- /* OOB area */
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- column -= mtd->oobblock;
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- readcmd = NAND_CMD_READOOB;
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- } else if (column < 256) {
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- /* First 256 bytes --> READ0 */
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- readcmd = NAND_CMD_READ0;
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- } else {
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- column -= 256;
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- readcmd = NAND_CMD_READ1;
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- }
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- cmx270_nand_write_CLE(mtd, readcmd);
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- }
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- cmx270_nand_write_CLE(mtd, command);
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+ DRAIN_WB();
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- if (column != -1 || page_addr != -1) {
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-
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- /* Serially input address */
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- if (column != -1) {
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- cmx270_nand_write_ALE(mtd, column);
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- }
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- if (page_addr != -1) {
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- cmx270_nand_write_ALE(mtd, (unsigned char) (page_addr & 0xff));
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- cmx270_nand_write_ALE(mtd, (unsigned char) ((page_addr >> 8) & 0xff));
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- /* One more address cycle for devices > 32MiB */
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- if (this->chipsize > (32 << 20))
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- cmx270_nand_write_ALE(mtd, (unsigned char) ((page_addr >> 16) & 0x0f));
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- }
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- }
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+ switch(cmd) {
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- /*
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- * program and erase have their own busy handlers
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- * status and sequential in needs no delay
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- */
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- switch (command) {
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-
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- case NAND_CMD_PAGEPROG:
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- case NAND_CMD_ERASE1:
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- case NAND_CMD_ERASE2:
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- case NAND_CMD_SEQIN:
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- case NAND_CMD_STATUS:
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- return;
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-
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- case NAND_CMD_RESET:
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- if (this->dev_ready)
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- break;
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- udelay(this->chip_delay);
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- cmx270_nand_write_CLE(mtd, NAND_CMD_STATUS);
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- while ( !(this->read_byte(mtd) & 0x40));
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- return;
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-
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- /* This applies to read commands */
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- default:
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- /*
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- * If we don't have access to the busy pin, we apply the given
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- * command delay
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- */
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- if (!this->dev_ready) {
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- udelay(this->chip_delay);
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- return;
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- }
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- }
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-
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- /* Apply this short delay always to ensure that we do wait tWB in
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- * any case on any machine. */
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- ndelay (100);
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- /* wait until command is processed */
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- while (!this->dev_ready(mtd));
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- ndelay (100);
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+ case NAND_CTL_SETCLE:
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+ nandaddr |= (1 << 2);
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+ this->IO_ADDR_R = (void __iomem*)nandaddr;
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+ this->IO_ADDR_W = (void __iomem*)nandaddr;
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+ break;
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+ case NAND_CTL_CLRCLE:
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+ nandaddr &= ~(1 << 2);
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+ this->IO_ADDR_R = (void __iomem*)nandaddr;
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+ this->IO_ADDR_W = (void __iomem*)nandaddr;
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+ break;
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+
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+ case NAND_CTL_SETALE:
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+ nandaddr |= (1 << 3);
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+ this->IO_ADDR_R = (void __iomem*)nandaddr;
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+ this->IO_ADDR_W = (void __iomem*)nandaddr;
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+ break;
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+ case NAND_CTL_CLRALE:
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+ nandaddr &= ~(1 << 3);
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+ this->IO_ADDR_R = (void __iomem*)nandaddr;
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+ this->IO_ADDR_W = (void __iomem*)nandaddr;
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+ break;
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+
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+ case NAND_CTL_SETNCE:
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+ nand_cs_on();
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+ break;
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+ case NAND_CTL_CLRNCE:
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+ nand_cs_off();
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+ break;
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+ }
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+
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+ DRAIN_WB();
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}
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-/* Same as nand_core:nand_command_lp() but with different memory
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- * addresses for writing to ALE and CLE and without 16 bit support.
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+
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+/*
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+ * read device ready pin
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*/
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-static void cmx270_nand_command_lp (struct mtd_info *mtd, unsigned command, int column, int page_addr)
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+static int cmx270_device_ready(struct mtd_info *mtd)
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{
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- register struct nand_chip *this = mtd->priv;
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-
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- /* Emulate NAND_CMD_READOOB */
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- if (command == NAND_CMD_READOOB) {
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- column += mtd->oobblock;
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- command = NAND_CMD_READ0;
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-// printk("Read OOB: column: $%x, page: $%x\n", column, page_addr);
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- }
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-
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- /* Write out the command to the device. */
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- cmx270_nand_write_CLE(mtd, command);
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-
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- if (column != -1 || page_addr != -1) {
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-
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- /* Serially input address */
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- if (column != -1) {
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- cmx270_nand_write_ALE(mtd, column & 0xff);
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- cmx270_nand_write_ALE(mtd, column >> 8);
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- if ((column >> 8) > 0xf) {
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- printk("out of range column\n");
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- }
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- }
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- if (page_addr != -1) {
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- cmx270_nand_write_ALE(mtd, (unsigned char) (page_addr & 0xff));
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- cmx270_nand_write_ALE(mtd, (unsigned char) ((page_addr >> 8) & 0xff));
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- /* One more address cycle for devices > 128MiB */
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- if (this->chipsize > (128 << 20)) {
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- cmx270_nand_write_ALE(mtd, (unsigned char) ((page_addr >> 16) & 0xff));
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- }
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- }
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- }
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+ DRAIN_WB();
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- udelay(1);
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-
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- /*
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- * program and erase have their own busy handlers
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- * status and sequential in needs no delay
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- */
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- switch (command) {
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-
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- case NAND_CMD_CACHEDPROG:
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- case NAND_CMD_PAGEPROG:
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- case NAND_CMD_ERASE1:
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- case NAND_CMD_ERASE2:
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- case NAND_CMD_SEQIN:
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- case NAND_CMD_STATUS:
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- case NAND_CMD_DEPLETE1:
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- return;
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-
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- /*
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- * read error status commands require only a short delay
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- */
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- case NAND_CMD_STATUS_ERROR:
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- case NAND_CMD_STATUS_ERROR0:
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- case NAND_CMD_STATUS_ERROR1:
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- case NAND_CMD_STATUS_ERROR2:
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- case NAND_CMD_STATUS_ERROR3:
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- udelay(this->chip_delay);
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- return;
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-
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- case NAND_CMD_RESET:
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- if (this->dev_ready)
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- break;
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- udelay(this->chip_delay);
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- cmx270_nand_write_CLE(mtd, NAND_CMD_STATUS);
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- while ( !(this->read_byte(mtd) & NAND_STATUS_READY));
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- return;
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-
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- case NAND_CMD_READ0:
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- /* Write out the start read command */
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- cmx270_nand_write_CLE(mtd, NAND_CMD_READSTART);
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- /* Fall through into ready check */
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-
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- /* This applies to read commands */
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- default:
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- /*
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- * If we don't have access to the busy pin, we apply the given
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- * command delay
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- */
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- if (!this->dev_ready) {
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- udelay (this->chip_delay);
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- return;
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- }
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- }
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-
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- /* Apply this short delay always to ensure that we do wait tWB in
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- * any case on any machine. */
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- ndelay (100);
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- /* wait until command is processed */
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- while (!this->dev_ready(mtd));
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+ return (GPLR(GPIO_NAND_RB) & GPIO_bit(GPIO_NAND_RB));
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}
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-
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-#ifdef CONFIG_MTD_PARTITIONS
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-const char *part_probes[] = { "cmdlinepart", NULL };
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-#endif
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-
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-int __init cmx270_nand_init(void)
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+/*
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+ * Main initialization routine
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+ */
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+static int __devinit cmx270_init(void)
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{
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struct nand_chip *this;
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- struct mtd_partition* cmx270_partition_info;
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- int err = 0;
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-
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- pxa_gpio_mode(CM_X270_GPIO_NAND_RB);
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+ const char *part_type;
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+ struct mtd_partition *mtd_parts;
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+ int mtd_parts_nb = 0;
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+ int ret;
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- GPSR(CM_X270_GPIO_NAND_CS) = GPIO_bit(CM_X270_GPIO_NAND_CS);
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- pxa_gpio_mode(CM_X270_GPIO_NAND_CS | GPIO_OUT);
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-
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/* Allocate memory for MTD device structure and private data */
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- cmx270_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),
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- GFP_KERNEL);
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- if (!cmx270_mtd) {
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- printk(KERN_WARNING "Unable to allocate cm-x270 NAND mtd device structure.\n");
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- err = -ENOMEM;
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- goto out;
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+ cmx270_nand_mtd = kzalloc(sizeof(struct mtd_info) +
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+ sizeof(struct nand_chip),
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+ GFP_KERNEL);
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+ if (!cmx270_nand_mtd) {
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+ printk("Unable to allocate CM-X270 NAND MTD device structure.\n");
|
|
+ return -ENOMEM;
|
|
}
|
|
|
|
- /* map physical address */
|
|
- cmx270_nand_io_base = ioremap(CM_X270_NAND_PHYS, 0x100);
|
|
- if (!cmx270_nand_io_base) {
|
|
- err = -EIO;
|
|
- goto out_mtd;
|
|
+ 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_mtd[1]);
|
|
-
|
|
- /* Initialize structures */
|
|
- memset((char *) cmx270_mtd, 0, sizeof(struct mtd_info));
|
|
- memset((char *) this, 0, sizeof(struct nand_chip));
|
|
+ this = (struct nand_chip *)(&cmx270_nand_mtd[1]);
|
|
|
|
/* Link the private data with the MTD structure */
|
|
- cmx270_mtd->priv = this;
|
|
+ cmx270_nand_mtd->owner = THIS_MODULE;
|
|
+ cmx270_nand_mtd->priv = this;
|
|
|
|
- this->IO_ADDR_R = cmx270_nand_io_base;
|
|
- this->IO_ADDR_W = cmx270_nand_io_base;
|
|
- this->read_byte = cmx270_nand_read_byte;
|
|
- this->write_byte = cmx270_nand_write_byte;
|
|
- this->write_buf = cmx270_nand_write_buf;
|
|
- this->read_buf = cmx270_nand_read_buf;
|
|
- this->verify_buf = cmx270_nand_verify_buf;
|
|
- this->hwcontrol = cmx270_nand_hwcontrol;
|
|
- this->dev_ready = cmx270_nand_device_ready;
|
|
- this->cmdfunc = cmx270_nand_command_lp;
|
|
- this->chip_delay = 25;
|
|
+ /* insert callbacks */
|
|
+ this->IO_ADDR_R = cmx270_nand_io;
|
|
+ this->IO_ADDR_W = cmx270_nand_io;
|
|
+ this->hwcontrol = cmx270_hwcontrol;
|
|
+ this->dev_ready = cmx270_device_ready;
|
|
+
|
|
+ /* 15 us command delay time */
|
|
+ this->chip_delay = 20;
|
|
this->eccmode = NAND_ECC_SOFT;
|
|
|
|
- /* Scan to find existance of the device */
|
|
- if (nand_scan(cmx270_mtd, 1)) {
|
|
- err = -ENXIO;
|
|
- goto out_ior;
|
|
+ /* 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 */
|
|
- cmx270_mtd->name = "cmx270-mtd";
|
|
- nr_partitions = parse_mtd_partitions(cmx270_mtd, part_probes, &cmx270_partition_info, 0);
|
|
- if (nr_partitions <= 0) {
|
|
- nr_partitions = DEFAULT_NUM_PARTITIONS;
|
|
- cmx270_partition_info = cmx270_default_partition_info;
|
|
- }
|
|
+ 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;
|
|
|
|
- add_mtd_partitions(cmx270_mtd, cmx270_partition_info, nr_partitions);
|
|
-
|
|
- goto out;
|
|
-
|
|
-out_ior:
|
|
- iounmap((void*) cmx270_nand_io_base);
|
|
-out_mtd:
|
|
- kfree(cmx270_mtd);
|
|
-out:
|
|
- return err;
|
|
}
|
|
-module_init(cmx270_nand_init);
|
|
+module_init(cmx270_init);
|
|
|
|
-static void __exit cmx270_nand_cleanup(void)
|
|
+/*
|
|
+ * Clean up routine
|
|
+ */
|
|
+static void __devexit cmx270_cleanup(void)
|
|
{
|
|
- nand_release(cmx270_mtd);
|
|
- kfree(cmx270_mtd);
|
|
+ /* 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("Raphael Assenat <raph@8d.com>");
|
|
-MODULE_DESCRIPTION("NAND flash driver for cm-x270 boards");
|
|
-
|
|
+MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
|
|
+MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");
|