1 files changed, 477 insertions, 0 deletions

diff --git a/drivers/mtd/nand/au1550nd.c b/drivers/mtd/nand/au1550nd.c
new file mode 100644
index 000000000000..4c7719ce3f48
--- /dev/null
+++ b/drivers/mtd/nand/au1550nd.c
@@ -0,0 +1,477 @@
+/*
+ *  drivers/mtd/nand/au1550nd.c
+ *
+ *  Copyright (C) 2004 Embedded Edge, LLC
+ *
+ * $Id: au1550nd.c,v 1.11 2004/11/04 12:53:10 gleixner 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/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/io.h>
+
+/* fixme: this is ugly */
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 0)
+#include <asm/mach-au1x00/au1000.h>
+#ifdef CONFIG_MIPS_PB1550
+#include <asm/mach-pb1x00/pb1550.h> 
+#endif
+#ifdef CONFIG_MIPS_DB1550
+#include <asm/mach-db1x00/db1x00.h> 
+#endif
+#else
+#include <asm/au1000.h>
+#ifdef CONFIG_MIPS_PB1550
+#include <asm/pb1550.h> 
+#endif
+#ifdef CONFIG_MIPS_DB1550
+#include <asm/db1x00.h> 
+#endif
+#endif
+
+/*
+ * MTD structure for NAND controller
+ */
+static struct mtd_info *au1550_mtd = NULL;
+static void __iomem *p_nand;
+static int nand_width = 1; /* default x8*/
+
+#define NAND_CS 1
+
+/*
+ * Define partitions for flash device
+ */
+const static struct mtd_partition partition_info[] = {
+#ifdef CONFIG_MIPS_PB1550
+#define NUM_PARTITIONS            2
+        { 
+                .name = "Pb1550 NAND FS 0",
+                .offset = 0,
+                .size = 8*1024*1024 
+        },
+        { 
+                .name = "Pb1550 NAND FS 1",
+                .offset =  MTDPART_OFS_APPEND,
+                .size =    MTDPART_SIZ_FULL
+        }
+#endif
+#ifdef CONFIG_MIPS_DB1550
+#define NUM_PARTITIONS            2
+        { 
+                .name = "Db1550 NAND FS 0",
+                .offset = 0,
+                .size = 8*1024*1024 
+        },
+        { 
+                .name = "Db1550 NAND FS 1",
+                .offset =  MTDPART_OFS_APPEND,
+                .size =    MTDPART_SIZ_FULL
+        }
+#endif
+};
+
+
+/**
+ * au_read_byte -  read one byte from the chip
+ * @mtd:        MTD device structure
+ *
+ *  read function for 8bit buswith
+ */
+static u_char au_read_byte(struct mtd_info *mtd)
+{
+        struct nand_chip *this = mtd->priv;
+        u_char ret = readb(this->IO_ADDR_R);
+        au_sync();
+        return ret;
+}
+
+/**
+ * au_write_byte -  write one byte to the chip
+ * @mtd:        MTD device structure
+ * @byte:       pointer to data byte to write
+ *
+ *  write function for 8it buswith
+ */
+static void au_write_byte(struct mtd_info *mtd, u_char byte)
+{
+        struct nand_chip *this = mtd->priv;
+        writeb(byte, this->IO_ADDR_W);
+        au_sync();
+}
+
+/**
+ * au_read_byte16 -  read one byte endianess aware from the chip
+ * @mtd:        MTD device structure
+ *
+ *  read function for 16bit buswith with 
+ * endianess conversion
+ */
+static u_char au_read_byte16(struct mtd_info *mtd)
+{
+        struct nand_chip *this = mtd->priv;
+        u_char ret = (u_char) cpu_to_le16(readw(this->IO_ADDR_R));
+        au_sync();
+        return ret;
+}
+
+/**
+ * au_write_byte16 -  write one byte endianess aware to the chip
+ * @mtd:        MTD device structure
+ * @byte:       pointer to data byte to write
+ *
+ *  write function for 16bit buswith with
+ * endianess conversion
+ */
+static void au_write_byte16(struct mtd_info *mtd, u_char byte)
+{
+        struct nand_chip *this = mtd->priv;
+        writew(le16_to_cpu((u16) byte), this->IO_ADDR_W);
+        au_sync();
+}
+
+/**
+ * au_read_word -  read one word from the chip
+ * @mtd:        MTD device structure
+ *
+ *  read function for 16bit buswith without 
+ * endianess conversion
+ */
+static u16 au_read_word(struct mtd_info *mtd)
+{
+        struct nand_chip *this = mtd->priv;
+        u16 ret = readw(this->IO_ADDR_R);
+        au_sync();
+        return ret;
+}
+
+/**
+ * au_write_word -  write one word to the chip
+ * @mtd:        MTD device structure
+ * @word:       data word to write
+ *
+ *  write function for 16bit buswith without 
+ * endianess conversion
+ */
+static void au_write_word(struct mtd_info *mtd, u16 word)
+{
+        struct nand_chip *this = mtd->priv;
+        writew(word, this->IO_ADDR_W);
+        au_sync();
+}
+
+/**
+ * au_write_buf -  write buffer to chip
+ * @mtd:        MTD device structure
+ * @buf:        data buffer
+ * @len:        number of bytes to write
+ *
+ *  write function for 8bit buswith
+ */
+static void au_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++) {
+                writeb(buf[i], this->IO_ADDR_W);
+                au_sync();
+        }
+}
+
+/**
+ * au_read_buf -  read chip data into buffer 
+ * @mtd:        MTD device structure
+ * @buf:        buffer to store date
+ * @len:        number of bytes to read
+ *
+ *  read function for 8bit buswith
+ */
+static void au_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[i] = readb(this->IO_ADDR_R);
+                au_sync();      
+        }
+}
+
+/**
+ * au_verify_buf -  Verify chip data against buffer 
+ * @mtd:        MTD device structure
+ * @buf:        buffer containing the data to compare
+ * @len:        number of bytes to compare
+ *
+ *  verify function for 8bit buswith
+ */
+static int au_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] != readb(this->IO_ADDR_R))
+                        return -EFAULT;
+                au_sync();
+        }
+
+        return 0;
+}
+
+/**
+ * au_write_buf16 -  write buffer to chip
+ * @mtd:        MTD device structure
+ * @buf:        data buffer
+ * @len:        number of bytes to write
+ *
+ *  write function for 16bit buswith
+ */
+static void au_write_buf16(struct mtd_info *mtd, const u_char *buf, int len)
+{
+        int i;
+        struct nand_chip *this = mtd->priv;
+        u16 *p = (u16 *) buf;
+        len >>= 1;
+        
+        for (i=0; i<len; i++) {
+                writew(p[i], this->IO_ADDR_W);
+                au_sync();
+        }
+                
+}
+
+/**
+ * au_read_buf16 -  read chip data into buffer 
+ * @mtd:        MTD device structure
+ * @buf:        buffer to store date
+ * @len:        number of bytes to read
+ *
+ *  read function for 16bit buswith
+ */
+static void au_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
+{
+        int i;
+        struct nand_chip *this = mtd->priv;
+        u16 *p = (u16 *) buf;
+        len >>= 1;
+
+        for (i=0; i<len; i++) {
+                p[i] = readw(this->IO_ADDR_R);
+                au_sync();
+        }
+}
+
+/**
+ * au_verify_buf16 -  Verify chip data against buffer 
+ * @mtd:        MTD device structure
+ * @buf:        buffer containing the data to compare
+ * @len:        number of bytes to compare
+ *
+ *  verify function for 16bit buswith
+ */
+static int au_verify_buf16(struct mtd_info *mtd, const u_char *buf, int len)
+{
+        int i;
+        struct nand_chip *this = mtd->priv;
+        u16 *p = (u16 *) buf;
+        len >>= 1;
+
+        for (i=0; i<len; i++) {
+                if (p[i] != readw(this->IO_ADDR_R))
+                        return -EFAULT;
+                au_sync();
+        }
+        return 0;
+}
+
+
+static void au1550_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+        register struct nand_chip *this = mtd->priv;
+
+        switch(cmd){
+
+        case NAND_CTL_SETCLE: this->IO_ADDR_W = p_nand + MEM_STNAND_CMD; break;
+        case NAND_CTL_CLRCLE: this->IO_ADDR_W = p_nand + MEM_STNAND_DATA; break;
+
+        case NAND_CTL_SETALE: this->IO_ADDR_W = p_nand + MEM_STNAND_ADDR; break;
+        case NAND_CTL_CLRALE: 
+                this->IO_ADDR_W = p_nand + MEM_STNAND_DATA; 
+                /* FIXME: Nobody knows why this is neccecary, 
+                 * but it works only that way */
+                udelay(1); 
+                break;
+
+        case NAND_CTL_SETNCE: 
+                /* assert (force assert) chip enable */
+                au_writel((1<<(4+NAND_CS)) , MEM_STNDCTL); break;
+                break;
+
+        case NAND_CTL_CLRNCE: 
+                /* deassert chip enable */
+                au_writel(0, MEM_STNDCTL); break;
+                break;
+        }
+
+        this->IO_ADDR_R = this->IO_ADDR_W;
+        
+        /* Drain the writebuffer */
+        au_sync();
+}
+
+int au1550_device_ready(struct mtd_info *mtd)
+{
+        int ret = (au_readl(MEM_STSTAT) & 0x1) ? 1 : 0;
+        au_sync();
+        return ret;
+}
+
+/*
+ * Main initialization routine
+ */
+int __init au1550_init (void)
+{
+        struct nand_chip *this;
+        u16 boot_swapboot = 0; /* default value */
+        int retval;
+
+        /* Allocate memory for MTD device structure and private data */
+        au1550_mtd = kmalloc (sizeof(struct mtd_info) + 
+                        sizeof (struct nand_chip), GFP_KERNEL);
+        if (!au1550_mtd) {
+                printk ("Unable to allocate NAND MTD dev structure.\n");
+                return -ENOMEM;
+        }
+
+        /* Get pointer to private data */
+        this = (struct nand_chip *) (&au1550_mtd[1]);
+
+        /* Initialize structures */
+        memset((char *) au1550_mtd, 0, sizeof(struct mtd_info));
+        memset((char *) this, 0, sizeof(struct nand_chip));
+
+        /* Link the private data with the MTD structure */
+        au1550_mtd->priv = this;
+
+
+        /* MEM_STNDCTL: disable ints, disable nand boot */
+        au_writel(0, MEM_STNDCTL);
+
+#ifdef CONFIG_MIPS_PB1550
+        /* set gpio206 high */
+        au_writel(au_readl(GPIO2_DIR) & ~(1<<6), GPIO2_DIR);
+
+        boot_swapboot = (au_readl(MEM_STSTAT) & (0x7<<1)) | 
+                ((bcsr->status >> 6)  & 0x1);
+        switch (boot_swapboot) {
+                case 0:
+                case 2:
+                case 8:
+                case 0xC:
+                case 0xD:
+                        /* x16 NAND Flash */
+                        nand_width = 0;
+                        break;
+                case 1:
+                case 9:
+                case 3:
+                case 0xE:
+                case 0xF:
+                        /* x8 NAND Flash */
+                        nand_width = 1;
+                        break;
+                default:
+                        printk("Pb1550 NAND: bad boot:swap\n");
+                        retval = -EINVAL;
+                        goto outmem;
+        }
+#endif
+
+        /* Configure RCE1 - should be done by YAMON */
+        au_writel(0x5 | (nand_width << 22), 0xB4001010); /* MEM_STCFG1 */
+        au_writel(NAND_TIMING, 0xB4001014); /* MEM_STTIME1 */
+        au_sync();
+
+        /* setup and enable chip select, MEM_STADDR1 */
+        /* we really need to decode offsets only up till 0x20 */
+        au_writel((1<<28) | (NAND_PHYS_ADDR>>4) | 
+                        (((NAND_PHYS_ADDR + 0x1000)-1) & (0x3fff<<18)>>18), 
+                        MEM_STADDR1);
+        au_sync();
+
+        p_nand = ioremap(NAND_PHYS_ADDR, 0x1000);
+
+        /* Set address of hardware control function */
+        this->hwcontrol = au1550_hwcontrol;
+        this->dev_ready = au1550_device_ready;
+        /* 30 us command delay time */
+        this->chip_delay = 30;          
+        this->eccmode = NAND_ECC_SOFT;
+
+        this->options = NAND_NO_AUTOINCR;
+
+        if (!nand_width)
+                this->options |= NAND_BUSWIDTH_16;
+
+        this->read_byte = (!nand_width) ? au_read_byte16 : au_read_byte;
+        this->write_byte = (!nand_width) ? au_write_byte16 : au_write_byte;
+        this->write_word = au_write_word;
+        this->read_word = au_read_word;
+        this->write_buf = (!nand_width) ? au_write_buf16 : au_write_buf;
+        this->read_buf = (!nand_width) ? au_read_buf16 : au_read_buf;
+        this->verify_buf = (!nand_width) ? au_verify_buf16 : au_verify_buf;
+
+        /* Scan to find existence of the device */
+        if (nand_scan (au1550_mtd, 1)) {
+                retval = -ENXIO;
+                goto outio;
+        }
+
+        /* Register the partitions */
+        add_mtd_partitions(au1550_mtd, partition_info, NUM_PARTITIONS);
+
+        return 0;
+
+ outio:
+        iounmap ((void *)p_nand);
+        
+ outmem:
+        kfree (au1550_mtd);
+        return retval;
+}
+
+module_init(au1550_init);
+
+/*
+ * Clean up routine
+ */
+#ifdef MODULE
+static void __exit au1550_cleanup (void)
+{
+        struct nand_chip *this = (struct nand_chip *) &au1550_mtd[1];
+
+        /* Release resources, unregister device */
+        nand_release (au1550_mtd);
+
+        /* Free the MTD device structure */
+        kfree (au1550_mtd);
+
+        /* Unmap */
+        iounmap ((void *)p_nand);
+}
+module_exit(au1550_cleanup);
+#endif
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Embedded Edge, LLC");
+MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on Pb1550 board");