1 files changed, 228 insertions, 93 deletions

diff --git a/drivers/mtd/nand/au1550nd.c b/drivers/mtd/nand/au1550nd.c
index bde3550910a2..31228334da12 100644
--- a/drivers/mtd/nand/au1550nd.c
+++ b/drivers/mtd/nand/au1550nd.c
@@ -14,6 +14,7 @@
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/interrupt.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
@@ -38,22 +39,21 @@
  */
 static struct mtd_info *au1550_mtd = NULL;
 static void __iomem *p_nand;
-static int nand_width = 1; /* default x8*/
+static int nand_width = 1;      /* default x8 */
+static void (*au1550_write_byte)(struct mtd_info *, u_char);
 
 /*
  * Define partitions for flash device
  */
 static const struct mtd_partition partition_info[] = {
         {
-                .name   = "NAND FS 0",
-                .offset = 0,
-                .size   = 8*1024*1024
-        },
+         .name = "NAND FS 0",
+         .offset = 0,
+         .size = 8 * 1024 * 1024},
         {
-                .name   = "NAND FS 1",
-                .offset =  MTDPART_OFS_APPEND,
-                .size   =    MTDPART_SIZ_FULL
-        }
+         .name = "NAND FS 1",
+         .offset = MTDPART_OFS_APPEND,
+         .size = MTDPART_SIZ_FULL}
 };
 
 /**
@@ -130,21 +130,6 @@ static u16 au_read_word(struct mtd_info *mtd)
 }
 
 /**
- * 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
@@ -157,7 +142,7 @@ 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++) {
+        for (i = 0; i < len; i++) {
                 writeb(buf[i], this->IO_ADDR_W);
                 au_sync();
         }
@@ -176,7 +161,7 @@ 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++) {
+        for (i = 0; i < len; i++) {
                 buf[i] = readb(this->IO_ADDR_R);
                 au_sync();
         }
@@ -195,7 +180,7 @@ 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++) {
+        for (i = 0; i < len; i++) {
                 if (buf[i] != readb(this->IO_ADDR_R))
                         return -EFAULT;
                 au_sync();
@@ -219,7 +204,7 @@ static void au_write_buf16(struct mtd_info *mtd, const u_char *buf, int len)
         u16 *p = (u16 *) buf;
         len >>= 1;
 
-        for (i=0; i<len; i++) {
+        for (i = 0; i < len; i++) {
                 writew(p[i], this->IO_ADDR_W);
                 au_sync();
         }
@@ -241,7 +226,7 @@ static void au_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
         u16 *p = (u16 *) buf;
         len >>= 1;
 
-        for (i=0; i<len; i++) {
+        for (i = 0; i < len; i++) {
                 p[i] = readw(this->IO_ADDR_R);
                 au_sync();
         }
@@ -262,7 +247,7 @@ static int au_verify_buf16(struct mtd_info *mtd, const u_char *buf, int len)
         u16 *p = (u16 *) buf;
         len >>= 1;
 
-        for (i=0; i<len; i++) {
+        for (i = 0; i < len; i++) {
                 if (p[i] != readw(this->IO_ADDR_R))
                         return -EFAULT;
                 au_sync();
@@ -270,32 +255,52 @@ static int au_verify_buf16(struct mtd_info *mtd, const u_char *buf, int len)
         return 0;
 }
 
+/* Select the chip by setting nCE to low */
+#define NAND_CTL_SETNCE         1
+/* Deselect the chip by setting nCE to high */
+#define NAND_CTL_CLRNCE         2
+/* Select the command latch by setting CLE to high */
+#define NAND_CTL_SETCLE         3
+/* Deselect the command latch by setting CLE to low */
+#define NAND_CTL_CLRCLE         4
+/* Select the address latch by setting ALE to high */
+#define NAND_CTL_SETALE         5
+/* Deselect the address latch by setting ALE to low */
+#define NAND_CTL_CLRALE         6
 
 static void au1550_hwcontrol(struct mtd_info *mtd, int cmd)
 {
         register struct nand_chip *this = mtd->priv;
 
-        switch(cmd){
+        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_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_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,
+                /* FIXME: Nobody knows why this is necessary,
                  * 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;
+                au_writel((1 << (4 + NAND_CS)), MEM_STNDCTL);
                 break;
 
         case NAND_CTL_CLRNCE:
-                /* deassert chip enable */
-                au_writel(0, MEM_STNDCTL); break;
+                /* deassert chip enable */
+                au_writel(0, MEM_STNDCTL);
                 break;
         }
 
@@ -312,69 +317,200 @@ int au1550_device_ready(struct mtd_info *mtd)
         return ret;
 }
 
+/**
+ * au1550_select_chip - control -CE line
+ *      Forbid driving -CE manually permitting the NAND controller to do this.
+ *      Keeping -CE asserted during the whole sector reads interferes with the
+ *      NOR flash and PCMCIA drivers as it causes contention on the static bus.
+ *      We only have to hold -CE low for the NAND read commands since the flash
+ *      chip needs it to be asserted during chip not ready time but the NAND
+ *      controller keeps it released.
+ *
+ * @mtd:        MTD device structure
+ * @chip:       chipnumber to select, -1 for deselect
+ */
+static void au1550_select_chip(struct mtd_info *mtd, int chip)
+{
+}
+
+/**
+ * au1550_command - Send command to NAND device
+ * @mtd:        MTD device structure
+ * @command:    the command to be sent
+ * @column:     the column address for this command, -1 if none
+ * @page_addr:  the page address for this command, -1 if none
+ */
+static void au1550_command(struct mtd_info *mtd, unsigned command, int column, int page_addr)
+{
+        register struct nand_chip *this = mtd->priv;
+        int ce_override = 0, i;
+        ulong flags;
+
+        /* Begin command latch cycle */
+        au1550_hwcontrol(mtd, NAND_CTL_SETCLE);
+        /*
+         * Write out the command to the device.
+         */
+        if (command == NAND_CMD_SEQIN) {
+                int readcmd;
+
+                if (column >= mtd->writesize) {
+                        /* OOB area */
+                        column -= mtd->writesize;
+                        readcmd = NAND_CMD_READOOB;
+                } else if (column < 256) {
+                        /* First 256 bytes --> READ0 */
+                        readcmd = NAND_CMD_READ0;
+                } else {
+                        column -= 256;
+                        readcmd = NAND_CMD_READ1;
+                }
+                au1550_write_byte(mtd, readcmd);
+        }
+        au1550_write_byte(mtd, command);
+
+        /* Set ALE and clear CLE to start address cycle */
+        au1550_hwcontrol(mtd, NAND_CTL_CLRCLE);
+
+        if (column != -1 || page_addr != -1) {
+                au1550_hwcontrol(mtd, NAND_CTL_SETALE);
+
+                /* Serially input address */
+                if (column != -1) {
+                        /* Adjust columns for 16 bit buswidth */
+                        if (this->options & NAND_BUSWIDTH_16)
+                                column >>= 1;
+                        au1550_write_byte(mtd, column);
+                }
+                if (page_addr != -1) {
+                        au1550_write_byte(mtd, (u8)(page_addr & 0xff));
+
+                        if (command == NAND_CMD_READ0 ||
+                            command == NAND_CMD_READ1 ||
+                            command == NAND_CMD_READOOB) {
+                                /*
+                                 * NAND controller will release -CE after
+                                 * the last address byte is written, so we'll
+                                 * have to forcibly assert it. No interrupts
+                                 * are allowed while we do this as we don't
+                                 * want the NOR flash or PCMCIA drivers to
+                                 * steal our precious bytes of data...
+                                 */
+                                ce_override = 1;
+                                local_irq_save(flags);
+                                au1550_hwcontrol(mtd, NAND_CTL_SETNCE);
+                        }
+
+                        au1550_write_byte(mtd, (u8)(page_addr >> 8));
+
+                        /* One more address cycle for devices > 32MiB */
+                        if (this->chipsize > (32 << 20))
+                                au1550_write_byte(mtd, (u8)((page_addr >> 16) & 0x0f));
+                }
+                /* Latch in address */
+                au1550_hwcontrol(mtd, NAND_CTL_CLRALE);
+        }
+
+        /*
+         * Program and erase have their own busy handlers.
+         * Status and sequential in need no delay.
+         */
+        switch (command) {
+
+        case NAND_CMD_PAGEPROG:
+        case NAND_CMD_ERASE1:
+        case NAND_CMD_ERASE2:
+        case NAND_CMD_SEQIN:
+        case NAND_CMD_STATUS:
+                return;
+
+        case NAND_CMD_RESET:
+                break;
+
+        case NAND_CMD_READ0:
+        case NAND_CMD_READ1:
+        case NAND_CMD_READOOB:
+                /* Check if we're really driving -CE low (just in case) */
+                if (unlikely(!ce_override))
+                        break;
+
+                /* Apply a short delay always to ensure that we do wait tWB. */
+                ndelay(100);
+                /* Wait for a chip to become ready... */
+                for (i = this->chip_delay; !this->dev_ready(mtd) && i > 0; --i)
+                        udelay(1);
+
+                /* Release -CE and re-enable interrupts. */
+                au1550_hwcontrol(mtd, NAND_CTL_CLRNCE);
+                local_irq_restore(flags);
+                return;
+        }
+        /* Apply this short delay always to ensure that we do wait tWB. */
+        ndelay(100);
+
+        while(!this->dev_ready(mtd));
+}
+
+
 /*
  * Main initialization routine
  */
-int __init au1xxx_nand_init (void)
+static int __init au1xxx_nand_init(void)
 {
         struct nand_chip *this;
-        u16 boot_swapboot = 0; /* default value */
+        u16 boot_swapboot = 0;  /* default value */
         int retval;
         u32 mem_staddr;
         u32 nand_phys;
 
         /* Allocate memory for MTD device structure and private data */
-        au1550_mtd = kmalloc (sizeof(struct mtd_info) +
-                        sizeof (struct nand_chip), GFP_KERNEL);
+        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");
+                printk("Unable to allocate NAND MTD dev structure.\n");
                 return -ENOMEM;
         }
 
         /* Get pointer to private data */
-        this = (struct nand_chip *) (&au1550_mtd[1]);
+        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));
+        memset(au1550_mtd, 0, sizeof(struct mtd_info));
+        memset(this, 0, sizeof(struct nand_chip));
 
         /* Link the private data with the MTD structure */
         au1550_mtd->priv = this;
+        au1550_mtd->owner = THIS_MODULE;
 
 
-        /* disable interrupts */
-        au_writel(au_readl(MEM_STNDCTL) & ~(1<<8), MEM_STNDCTL);
-
-        /* disable NAND boot */
-        au_writel(au_readl(MEM_STNDCTL) & ~(1<<0), MEM_STNDCTL);
+        /* 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);
+        au_writel(au_readl(GPIO2_DIR) & ~(1 << 6), GPIO2_DIR);
 
-        boot_swapboot = (au_readl(MEM_STSTAT) & (0x7<<1)) |
-                ((bcsr->status >> 6)  & 0x1);
+        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;
+        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
 
@@ -424,21 +560,22 @@ int __init au1xxx_nand_init (void)
 
         /* make controller and MTD agree */
         if (NAND_CS == 0)
-                nand_width = au_readl(MEM_STCFG0) & (1<<22);
+                nand_width = au_readl(MEM_STCFG0) & (1 << 22);
         if (NAND_CS == 1)
-                nand_width = au_readl(MEM_STCFG1) & (1<<22);
+                nand_width = au_readl(MEM_STCFG1) & (1 << 22);
         if (NAND_CS == 2)
-                nand_width = au_readl(MEM_STCFG2) & (1<<22);
+                nand_width = au_readl(MEM_STCFG2) & (1 << 22);
         if (NAND_CS == 3)
-                nand_width = au_readl(MEM_STCFG3) & (1<<22);
-
+                nand_width = au_readl(MEM_STCFG3) & (1 << 22);
 
         /* Set address of hardware control function */
-        this->hwcontrol = au1550_hwcontrol;
         this->dev_ready = au1550_device_ready;
+        this->select_chip = au1550_select_chip;
+        this->cmdfunc = au1550_command;
+
         /* 30 us command delay time */
         this->chip_delay = 30;
-        this->eccmode = NAND_ECC_SOFT;
+        this->ecc.mode = NAND_ECC_SOFT;
 
         this->options = NAND_NO_AUTOINCR;
 
@@ -446,15 +583,14 @@ int __init au1xxx_nand_init (void)
                 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;
+        au1550_write_byte = (!nand_width) ? au_write_byte16 : au_write_byte;
         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)) {
+        if (nand_scan(au1550_mtd, 1)) {
                 retval = -ENXIO;
                 goto outio;
         }
@@ -465,10 +601,10 @@ int __init au1xxx_nand_init (void)
         return 0;
 
  outio:
-        iounmap ((void *)p_nand);
+        iounmap((void *)p_nand);
 
  outmem:
-        kfree (au1550_mtd);
+        kfree(au1550_mtd);
         return retval;
 }
 
@@ -477,22 +613,21 @@ module_init(au1xxx_nand_init);
 /*
  * Clean up routine
  */
-#ifdef MODULE
-static void __exit au1550_cleanup (void)
+static void __exit au1550_cleanup(void)
 {
-        struct nand_chip *this = (struct nand_chip *) &au1550_mtd[1];
+        struct nand_chip *this = (struct nand_chip *)&au1550_mtd[1];
 
         /* Release resources, unregister device */
-        nand_release (au1550_mtd);
+        nand_release(au1550_mtd);
 
         /* Free the MTD device structure */
-        kfree (au1550_mtd);
+        kfree(au1550_mtd);
 
         /* Unmap */
-        iounmap ((void *)p_nand);
+        iounmap((void *)p_nand);
 }
+
 module_exit(au1550_cleanup);
-#endif
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Embedded Edge, LLC");