Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=54d33c4c715b80cc022b8e4974a4de693c96fc99
Commit:     54d33c4c715b80cc022b8e4974a4de693c96fc99
Parent:     d1da4e50e5d09f02c340927a4fcb7f54202fa033
Author:     Mike Rapoport <[EMAIL PROTECTED]>
AuthorDate: Sun Apr 22 08:53:21 2007 +0300
Committer:  David Woodhouse <[EMAIL PROTECTED]>
CommitDate: Fri Apr 27 23:04:32 2007 +0100

    [MTD] [NAND] CM-x270 MTD driver
    
    This patch provides MTD support for NAND flash devices on CM-x270 modules.
    
    Signed-off-by: Mike Rapoport <[EMAIL PROTECTED]>
    Signed-off-by: David Woodhouse <[EMAIL PROTECTED]>
---
 drivers/mtd/nand/Kconfig       |    5 +
 drivers/mtd/nand/Makefile      |    1 +
 drivers/mtd/nand/cmx270_nand.c |  267 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 273 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 4e62afe..d05873b 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -258,6 +258,11 @@ config MTD_NAND_AT91
          Enables support for NAND Flash / Smart Media Card interface
          on Atmel AT91 processors.
 
+config MTD_NAND_CM_X270
+       tristate "Support for NAND Flash on CM-X270 modules"
+       depends on MTD_NAND && MACH_ARMCORE
+
+
 config MTD_NAND_NANDSIM
        tristate "Support for NAND Flash Simulator"
        depends on MTD_PARTITIONS
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 80f1dfc..6872031 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_MTD_NAND_NANDSIM)                += nandsim.o
 obj-$(CONFIG_MTD_NAND_CS553X)          += cs553x_nand.o
 obj-$(CONFIG_MTD_NAND_NDFC)            += ndfc.o
 obj-$(CONFIG_MTD_NAND_AT91)            += at91_nand.o
+obj-$(CONFIG_MTD_NAND_CM_X270)         += cmx270_nand.o
 obj-$(CONFIG_MTD_NAND_BASLER_EXCITE)   += excite_nandflash.o
 
 nand-objs := nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/cmx270_nand.c b/drivers/mtd/nand/cmx270_nand.c
new file mode 100644
index 0000000..cb663ef
--- /dev/null
+++ b/drivers/mtd/nand/cmx270_nand.c
@@ -0,0 +1,267 @@
+/*
+ *  linux/drivers/mtd/nand/cmx270-nand.c
+ *
+ *  Copyright (C) 2006 Compulab, Ltd.
+ *  Mike Rapoport <[EMAIL PROTECTED]>
+ *
+ *  Derived from drivers/mtd/nand/h1910.c
+ *       Copyright (C) 2002 Marius Gröger ([EMAIL PROTECTED])
+ *       Copyright (c) 2001 Thomas Gleixner ([EMAIL PROTECTED])
+ *
+ *
+ * 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 NAND flash device found on the
+ *   CM-X270 board.
+ */
+
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include <asm/arch/hardware.h>
+#include <asm/arch/pxa-regs.h>
+
+#define GPIO_NAND_CS   (11)
+#define GPIO_NAND_RB   (89)
+
+/* This macro needed to ensure in-order operation of GPIO and local
+ * bus. Without both asm command and dummy uncached read there're
+ * states when NAND access is broken. I've looked for such macro(s) in
+ * include/asm-arm but found nothing approptiate.
+ * dmac_clean_range is close, but is makes cache invalidation
+ * unnecessary here and it cannot be used in module
+ */
+#define DRAIN_WB() \
+       do { \
+               unsigned char dummy; \
+               asm volatile ("mcr p15, 0, r0, c7, c10, 4":::"r0"); \
+               dummy=*((unsigned char*)UNCACHED_ADDR); \
+       } while(0)
+
+/* MTD structure for CM-X270 board */
+static struct mtd_info *cmx270_nand_mtd;
+
+/* remaped IO address of the device */
+static void __iomem *cmx270_nand_io;
+
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info[] = {
+       [0] = {
+               .name   = "cmx270-0",
+               .offset = 0,
+               .size   = MTDPART_SIZ_FULL
+       }
+};
+#define NUM_PARTITIONS (ARRAY_SIZE(partition_info))
+
+const char *part_probes[] = { "cmdlinepart", NULL };
+
+static u_char cmx270_read_byte(struct mtd_info *mtd)
+{
+       struct nand_chip *this = mtd->priv;
+
+       return (readl(this->IO_ADDR_R) >> 16);
+}
+
+static void cmx270_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
+{
+       int i;
+       struct nand_chip *this = mtd->priv;
+
+       for (i=0; i<len; i++)
+               writel((*buf++ << 16), this->IO_ADDR_W);
+}
+
+static void cmx270_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+{
+       int i;
+       struct nand_chip *this = mtd->priv;
+
+       for (i=0; i<len; i++)
+               *buf++ = readl(this->IO_ADDR_R) >> 16;
+}
+
+static int cmx270_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
+{
+       int i;
+       struct nand_chip *this = mtd->priv;
+
+       for (i=0; i<len; i++)
+               if (buf[i] != (u_char)(readl(this->IO_ADDR_R) >> 16))
+                       return -EFAULT;
+
+       return 0;
+}
+
+static inline void nand_cs_on(void)
+{
+       GPCR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
+}
+
+static void nand_cs_off(void)
+{
+       DRAIN_WB();
+
+       GPSR(GPIO_NAND_CS) = GPIO_bit(GPIO_NAND_CS);
+}
+
+/*
+ *     hardware specific access to control-lines
+ */
+static void cmx270_hwcontrol(struct mtd_info *mtd, int dat,
+                            unsigned int ctrl)
+{
+       struct nand_chip* this = mtd->priv;
+       unsigned int nandaddr = (unsigned int)this->IO_ADDR_W;
+
+       DRAIN_WB();
+
+       if (ctrl & NAND_CTRL_CHANGE) {
+               if ( ctrl & NAND_ALE )
+                       nandaddr |=  (1 << 3);
+               else
+                       nandaddr &= ~(1 << 3);
+               if ( ctrl & NAND_CLE )
+                       nandaddr |=  (1 << 2);
+               else
+                       nandaddr &= ~(1 << 2);
+               if ( ctrl & NAND_NCE )
+                       nand_cs_on();
+               else
+                       nand_cs_off();
+       }
+
+       DRAIN_WB();
+       this->IO_ADDR_W = (void __iomem*)nandaddr;
+       if (dat != NAND_CMD_NONE)
+               writel((dat << 16), this->IO_ADDR_W);
+
+       DRAIN_WB();
+}
+
+/*
+ *     read device ready pin
+ */
+static int cmx270_device_ready(struct mtd_info *mtd)
+{
+       DRAIN_WB();
+
+       return (GPLR(GPIO_NAND_RB) & GPIO_bit(GPIO_NAND_RB));
+}
+
+/*
+ * Main initialization routine
+ */
+static int cmx270_init(void)
+{
+       struct nand_chip *this;
+       const char *part_type;
+       struct mtd_partition *mtd_parts;
+       int mtd_parts_nb = 0;
+       int ret;
+
+       /* Allocate memory for MTD device structure and private data */
+       cmx270_nand_mtd = kzalloc(sizeof(struct mtd_info) +
+                                 sizeof(struct nand_chip),
+                                 GFP_KERNEL);
+       if (!cmx270_nand_mtd) {
+               printk("Unable to allocate CM-X270 NAND MTD device 
structure.\n");
+               return -ENOMEM;
+       }
+
+       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_nand_mtd[1]);
+
+       /* Link the private data with the MTD structure */
+       cmx270_nand_mtd->owner = THIS_MODULE;
+       cmx270_nand_mtd->priv = this;
+
+       /* insert callbacks */
+       this->IO_ADDR_R = cmx270_nand_io;
+       this->IO_ADDR_W = cmx270_nand_io;
+       this->cmd_ctrl = cmx270_hwcontrol;
+       this->dev_ready = cmx270_device_ready;
+
+       /* 15 us command delay time */
+       this->chip_delay = 20;
+       this->ecc.mode = NAND_ECC_SOFT;
+
+       /* 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 */
+       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;
+
+}
+module_init(cmx270_init);
+
+/*
+ * Clean up routine
+ */
+static void cmx270_cleanup(void)
+{
+       /* 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("Mike Rapoport <[EMAIL PROTECTED]>");
+MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");
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