--- /dev/null
+/*
+ * linux/drivers/mtd/nand/cmx270-nand.c
+ *
+ * Copyright (C) 2006 Compulab, Ltd.
+ * Mike Rapoport <mike@compulab.co.il>
+ *
+ * Derived from drivers/mtd/nand/h1910.c
+ * Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
+ * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
+ *
+ *
+ * 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 <mike@compulab.co.il>");
+MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");
git.openpandora.org / pandora-kernel.git / commitdiff