1 files changed, 157 insertions, 0 deletions

diff --git a/arch/cris/arch-v32/drivers/nandflash.c b/arch/cris/arch-v32/drivers/nandflash.c
new file mode 100644
index 000000000000..fc2a619b035d
--- /dev/null
+++ b/arch/cris/arch-v32/drivers/nandflash.c
@@ -0,0 +1,157 @@
+/*
+ *  arch/cris/arch-v32/drivers/nandflash.c
+ *
+ *  Copyright (c) 2004
+ *
+ *  Derived from drivers/mtd/nand/spia.c
+ *        Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
+ *
+ * $Id: nandflash.c,v 1.3 2005/06/01 10:57:12 starvik Exp $
+ *
+ * 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.
+ *
+ */
+
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <asm/arch/memmap.h>
+#include <asm/arch/hwregs/reg_map.h>
+#include <asm/arch/hwregs/reg_rdwr.h>
+#include <asm/arch/hwregs/gio_defs.h>
+#include <asm/arch/hwregs/bif_core_defs.h>
+#include <asm/io.h>
+
+#define CE_BIT 4
+#define CLE_BIT 5
+#define ALE_BIT 6
+#define BY_BIT 7
+
+static struct mtd_info *crisv32_mtd = NULL;
+/*
+ *      hardware specific access to control-lines
+*/
+static void crisv32_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+        unsigned long flags;
+        reg_gio_rw_pa_dout dout = REG_RD(gio, regi_gio, rw_pa_dout);
+
+        local_irq_save(flags);
+        switch(cmd){
+                case NAND_CTL_SETCLE:
+                     dout.data |= (1<<CLE_BIT);
+                     break;
+                case NAND_CTL_CLRCLE:
+                     dout.data &= ~(1<<CLE_BIT);
+                     break;
+                case NAND_CTL_SETALE:
+                     dout.data |= (1<<ALE_BIT);
+                     break;
+                case NAND_CTL_CLRALE:
+                     dout.data &= ~(1<<ALE_BIT);
+                     break;
+                case NAND_CTL_SETNCE:
+                     dout.data |= (1<<CE_BIT);
+                     break;
+                case NAND_CTL_CLRNCE:
+                     dout.data &= ~(1<<CE_BIT);
+                     break;
+        }
+        REG_WR(gio, regi_gio, rw_pa_dout, dout);
+        local_irq_restore(flags);
+}
+
+/*
+*       read device ready pin
+*/
+int crisv32_device_ready(struct mtd_info *mtd)
+{
+        reg_gio_r_pa_din din = REG_RD(gio, regi_gio, r_pa_din);
+        return ((din.data & (1 << BY_BIT)) >> BY_BIT);
+}
+
+/*
+ * Main initialization routine
+ */
+struct mtd_info* __init crisv32_nand_flash_probe (void)
+{
+        void __iomem *read_cs;
+        void __iomem *write_cs;
+
+        reg_bif_core_rw_grp3_cfg bif_cfg = REG_RD(bif_core, regi_bif_core, rw_grp3_cfg);
+        reg_gio_rw_pa_oe pa_oe = REG_RD(gio, regi_gio, rw_pa_oe);
+        struct nand_chip *this;
+        int err = 0;
+
+        /* Allocate memory for MTD device structure and private data */
+        crisv32_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
+                                GFP_KERNEL);
+        if (!crisv32_mtd) {
+                printk ("Unable to allocate CRISv32 NAND MTD device structure.\n");
+                err = -ENOMEM;
+                return NULL;
+        }
+
+        read_cs = ioremap(MEM_CSP0_START | MEM_NON_CACHEABLE, 8192);
+        write_cs = ioremap(MEM_CSP1_START | MEM_NON_CACHEABLE, 8192);
+
+        if (!read_cs || !write_cs) {
+                printk("CRISv32 NAND ioremap failed\n");
+                err = -EIO;
+                goto out_mtd;
+        }
+
+        /* Get pointer to private data */
+        this = (struct nand_chip *) (&crisv32_mtd[1]);
+
+        pa_oe.oe |= 1 << CE_BIT;
+        pa_oe.oe |= 1 << ALE_BIT;
+        pa_oe.oe |= 1 << CLE_BIT;
+        pa_oe.oe &= ~ (1 << BY_BIT);
+        REG_WR(gio, regi_gio, rw_pa_oe, pa_oe);
+
+        bif_cfg.gated_csp0 = regk_bif_core_rd;
+        bif_cfg.gated_csp1 = regk_bif_core_wr;
+        REG_WR(bif_core, regi_bif_core, rw_grp3_cfg, bif_cfg);
+
+        /* Initialize structures */
+        memset((char *) crisv32_mtd, 0, sizeof(struct mtd_info));
+        memset((char *) this, 0, sizeof(struct nand_chip));
+
+        /* Link the private data with the MTD structure */
+        crisv32_mtd->priv = this;
+
+        /* Set address of NAND IO lines */
+        this->IO_ADDR_R = read_cs;
+        this->IO_ADDR_W = write_cs;
+        this->hwcontrol = crisv32_hwcontrol;
+        this->dev_ready = crisv32_device_ready;
+        /* 20 us command delay time */
+        this->chip_delay = 20;
+        this->eccmode = NAND_ECC_SOFT;
+
+        /* Enable the following for a flash based bad block table */
+        this->options = NAND_USE_FLASH_BBT;
+
+        /* Scan to find existance of the device */
+        if (nand_scan (crisv32_mtd, 1)) {
+                err = -ENXIO;
+                goto out_ior;
+        }
+
+        return crisv32_mtd;
+
+out_ior:
+        iounmap((void *)read_cs);
+        iounmap((void *)write_cs);
+out_mtd:
+        kfree (crisv32_mtd);
+        return NULL;
+}
+