Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 702 insertions, 0 deletions

diff --git a/drivers/char/nwflash.c b/drivers/char/nwflash.c
new file mode 100644
index 000000000000..ca41d62b1d9d
--- /dev/null
+++ b/drivers/char/nwflash.c
@@ -0,0 +1,702 @@
+/*
+ * Flash memory interface rev.5 driver for the Intel
+ * Flash chips used on the NetWinder.
+ *
+ * 20/08/2000   RMK     use __ioremap to map flash into virtual memory
+ *                      make a few more places use "volatile"
+ * 22/05/2001   RMK     - Lock read against write
+ *                      - merge printk level changes (with mods) from Alan Cox.
+ *                      - use *ppos as the file position, not file->f_pos.
+ *                      - fix check for out of range pos and r/w size
+ *
+ * Please note that we are tampering with the only flash chip in the
+ * machine, which contains the bootup code.  We therefore have the
+ * power to convert these machines into doorstops...
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/miscdevice.h>
+#include <linux/spinlock.h>
+#include <linux/rwsem.h>
+#include <linux/init.h>
+#include <linux/smp_lock.h>
+
+#include <asm/hardware/dec21285.h>
+#include <asm/io.h>
+#include <asm/leds.h>
+#include <asm/mach-types.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+/*****************************************************************************/
+#include <asm/nwflash.h>
+
+#define NWFLASH_VERSION "6.4"
+
+static void kick_open(void);
+static int get_flash_id(void);
+static int erase_block(int nBlock);
+static int write_block(unsigned long p, const char __user *buf, int count);
+
+#define KFLASH_SIZE     1024*1024       //1 Meg
+#define KFLASH_SIZE4    4*1024*1024     //4 Meg
+#define KFLASH_ID       0x89A6          //Intel flash
+#define KFLASH_ID4      0xB0D4          //Intel flash 4Meg
+
+static int flashdebug;          //if set - we will display progress msgs
+
+static int gbWriteEnable;
+static int gbWriteBase64Enable;
+static volatile unsigned char *FLASH_BASE;
+static int gbFlashSize = KFLASH_SIZE;
+static DECLARE_MUTEX(nwflash_sem);
+
+extern spinlock_t gpio_lock;
+
+static int get_flash_id(void)
+{
+        volatile unsigned int c1, c2;
+
+        /*
+         * try to get flash chip ID
+         */
+        kick_open();
+        c2 = inb(0x80);
+        *(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x90;
+        udelay(15);
+        c1 = *(volatile unsigned char *) FLASH_BASE;
+        c2 = inb(0x80);
+
+        /*
+         * on 4 Meg flash the second byte is actually at offset 2...
+         */
+        if (c1 == 0xB0)
+                c2 = *(volatile unsigned char *) (FLASH_BASE + 2);
+        else
+                c2 = *(volatile unsigned char *) (FLASH_BASE + 1);
+
+        c2 += (c1 << 8);
+
+        /*
+         * set it back to read mode
+         */
+        *(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0xFF;
+
+        if (c2 == KFLASH_ID4)
+                gbFlashSize = KFLASH_SIZE4;
+
+        return c2;
+}
+
+static int flash_ioctl(struct inode *inodep, struct file *filep, unsigned int cmd, unsigned long arg)
+{
+        switch (cmd) {
+        case CMD_WRITE_DISABLE:
+                gbWriteBase64Enable = 0;
+                gbWriteEnable = 0;
+                break;
+
+        case CMD_WRITE_ENABLE:
+                gbWriteEnable = 1;
+                break;
+
+        case CMD_WRITE_BASE64K_ENABLE:
+                gbWriteBase64Enable = 1;
+                break;
+
+        default:
+                gbWriteBase64Enable = 0;
+                gbWriteEnable = 0;
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static ssize_t flash_read(struct file *file, char __user *buf, size_t size,
+                          loff_t *ppos)
+{
+        unsigned long p = *ppos;
+        unsigned int count = size;
+        int ret = 0;
+
+        if (flashdebug)
+                printk(KERN_DEBUG "flash_read: flash_read: offset=0x%lX, "
+                       "buffer=%p, count=0x%X.\n", p, buf, count);
+
+        if (count)
+                ret = -ENXIO;
+
+        if (p < gbFlashSize) {
+                if (count > gbFlashSize - p)
+                        count = gbFlashSize - p;
+
+                /*
+                 * We now lock against reads and writes. --rmk
+                 */
+                if (down_interruptible(&nwflash_sem))
+                        return -ERESTARTSYS;
+
+                ret = copy_to_user(buf, (void *)(FLASH_BASE + p), count);
+                if (ret == 0) {
+                        ret = count;
+                        *ppos += count;
+                } else
+                        ret = -EFAULT;
+                up(&nwflash_sem);
+        }
+        return ret;
+}
+
+static ssize_t flash_write(struct file *file, const char __user *buf,
+                           size_t size, loff_t * ppos)
+{
+        unsigned long p = *ppos;
+        unsigned int count = size;
+        int written;
+        int nBlock, temp, rc;
+        int i, j;
+
+        if (flashdebug)
+                printk("flash_write: offset=0x%lX, buffer=0x%p, count=0x%X.\n",
+                       p, buf, count);
+
+        if (!gbWriteEnable)
+                return -EINVAL;
+
+        if (p < 64 * 1024 && (!gbWriteBase64Enable))
+                return -EINVAL;
+
+        /*
+         * check for out of range pos or count
+         */
+        if (p >= gbFlashSize)
+                return count ? -ENXIO : 0;
+
+        if (count > gbFlashSize - p)
+                count = gbFlashSize - p;
+                        
+        if (!access_ok(VERIFY_READ, buf, count))
+                return -EFAULT;
+
+        /*
+         * We now lock against reads and writes. --rmk
+         */
+        if (down_interruptible(&nwflash_sem))
+                return -ERESTARTSYS;
+
+        written = 0;
+
+        leds_event(led_claim);
+        leds_event(led_green_on);
+
+        nBlock = (int) p >> 16; //block # of 64K bytes
+
+        /*
+         * # of 64K blocks to erase and write
+         */
+        temp = ((int) (p + count) >> 16) - nBlock + 1;
+
+        /*
+         * write ends at exactly 64k boundary?
+         */
+        if (((int) (p + count) & 0xFFFF) == 0)
+                temp -= 1;
+
+        if (flashdebug)
+                printk(KERN_DEBUG "flash_write: writing %d block(s) "
+                        "starting at %d.\n", temp, nBlock);
+
+        for (; temp; temp--, nBlock++) {
+                if (flashdebug)
+                        printk(KERN_DEBUG "flash_write: erasing block %d.\n", nBlock);
+
+                /*
+                 * first we have to erase the block(s), where we will write...
+                 */
+                i = 0;
+                j = 0;
+          RetryBlock:
+                do {
+                        rc = erase_block(nBlock);
+                        i++;
+                } while (rc && i < 10);
+
+                if (rc) {
+                        printk(KERN_ERR "flash_write: erase error %x\n", rc);
+                        break;
+                }
+                if (flashdebug)
+                        printk(KERN_DEBUG "flash_write: writing offset %lX, "
+                               "from buf %p, bytes left %X.\n", p, buf,
+                               count - written);
+
+                /*
+                 * write_block will limit write to space left in this block
+                 */
+                rc = write_block(p, buf, count - written);
+                j++;
+
+                /*
+                 * if somehow write verify failed? Can't happen??
+                 */
+                if (!rc) {
+                        /*
+                         * retry up to 10 times
+                         */
+                        if (j < 10)
+                                goto RetryBlock;
+                        else
+                                /*
+                                 * else quit with error...
+                                 */
+                                rc = -1;
+
+                }
+                if (rc < 0) {
+                        printk(KERN_ERR "flash_write: write error %X\n", rc);
+                        break;
+                }
+                p += rc;
+                buf += rc;
+                written += rc;
+                *ppos += rc;
+
+                if (flashdebug)
+                        printk(KERN_DEBUG "flash_write: written 0x%X bytes OK.\n", written);
+        }
+
+        /*
+         * restore reg on exit
+         */
+        leds_event(led_release);
+
+        up(&nwflash_sem);
+
+        return written;
+}
+
+
+/*
+ * The memory devices use the full 32/64 bits of the offset, and so we cannot
+ * check against negative addresses: they are ok. The return value is weird,
+ * though, in that case (0).
+ *
+ * also note that seeking relative to the "end of file" isn't supported:
+ * it has no meaning, so it returns -EINVAL.
+ */
+static loff_t flash_llseek(struct file *file, loff_t offset, int orig)
+{
+        loff_t ret;
+
+        lock_kernel();
+        if (flashdebug)
+                printk(KERN_DEBUG "flash_llseek: offset=0x%X, orig=0x%X.\n",
+                       (unsigned int) offset, orig);
+
+        switch (orig) {
+        case 0:
+                if (offset < 0) {
+                        ret = -EINVAL;
+                        break;
+                }
+
+                if ((unsigned int) offset > gbFlashSize) {
+                        ret = -EINVAL;
+                        break;
+                }
+
+                file->f_pos = (unsigned int) offset;
+                ret = file->f_pos;
+                break;
+        case 1:
+                if ((file->f_pos + offset) > gbFlashSize) {
+                        ret = -EINVAL;
+                        break;
+                }
+                if ((file->f_pos + offset) < 0) {
+                        ret = -EINVAL;
+                        break;
+                }
+                file->f_pos += offset;
+                ret = file->f_pos;
+                break;
+        default:
+                ret = -EINVAL;
+        }
+        unlock_kernel();
+        return ret;
+}
+
+
+/*
+ * assume that main Write routine did the parameter checking...
+ * so just go ahead and erase, what requested!
+ */
+
+static int erase_block(int nBlock)
+{
+        volatile unsigned int c1;
+        volatile unsigned char *pWritePtr;
+        unsigned long timeout;
+        int temp, temp1;
+
+        /*
+         * orange LED == erase
+         */
+        leds_event(led_amber_on);
+
+        /*
+         * reset footbridge to the correct offset 0 (...0..3)
+         */
+        *CSR_ROMWRITEREG = 0;
+
+        /*
+         * dummy ROM read
+         */
+        c1 = *(volatile unsigned char *) (FLASH_BASE + 0x8000);
+
+        kick_open();
+        /*
+         * reset status if old errors
+         */
+        *(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x50;
+
+        /*
+         * erase a block...
+         * aim at the middle of a current block...
+         */
+        pWritePtr = (unsigned char *) ((unsigned int) (FLASH_BASE + 0x8000 + (nBlock << 16)));
+        /*
+         * dummy read
+         */
+        c1 = *pWritePtr;
+
+        kick_open();
+        /*
+         * erase
+         */
+        *(volatile unsigned char *) pWritePtr = 0x20;
+
+        /*
+         * confirm
+         */
+        *(volatile unsigned char *) pWritePtr = 0xD0;
+
+        /*
+         * wait 10 ms
+         */
+        msleep(10);
+
+        /*
+         * wait while erasing in process (up to 10 sec)
+         */
+        timeout = jiffies + 10 * HZ;
+        c1 = 0;
+        while (!(c1 & 0x80) && time_before(jiffies, timeout)) {
+                msleep(10);
+                /*
+                 * read any address
+                 */
+                c1 = *(volatile unsigned char *) (pWritePtr);
+                //              printk("Flash_erase: status=%X.\n",c1);
+        }
+
+        /*
+         * set flash for normal read access
+         */
+        kick_open();
+//      *(volatile unsigned char*)(FLASH_BASE+0x8000) = 0xFF;
+        *(volatile unsigned char *) pWritePtr = 0xFF;   //back to normal operation
+
+        /*
+         * check if erase errors were reported
+         */
+        if (c1 & 0x20) {
+                printk(KERN_ERR "flash_erase: err at %p\n", pWritePtr);
+
+                /*
+                 * reset error
+                 */
+                *(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x50;
+                return -2;
+        }
+
+        /*
+         * just to make sure - verify if erased OK...
+         */
+        msleep(10);
+
+        pWritePtr = (unsigned char *) ((unsigned int) (FLASH_BASE + (nBlock << 16)));
+
+        for (temp = 0; temp < 16 * 1024; temp++, pWritePtr += 4) {
+                if ((temp1 = *(volatile unsigned int *) pWritePtr) != 0xFFFFFFFF) {
+                        printk(KERN_ERR "flash_erase: verify err at %p = %X\n",
+                               pWritePtr, temp1);
+                        return -1;
+                }
+        }
+
+        return 0;
+
+}
+
+/*
+ * write_block will limit number of bytes written to the space in this block
+ */
+static int write_block(unsigned long p, const char __user *buf, int count)
+{
+        volatile unsigned int c1;
+        volatile unsigned int c2;
+        unsigned char *pWritePtr;
+        unsigned int uAddress;
+        unsigned int offset;
+        unsigned long timeout;
+        unsigned long timeout1;
+
+        /*
+         * red LED == write
+         */
+        leds_event(led_amber_off);
+        leds_event(led_red_on);
+
+        pWritePtr = (unsigned char *) ((unsigned int) (FLASH_BASE + p));
+
+        /*
+         * check if write will end in this block....
+         */
+        offset = p & 0xFFFF;
+
+        if (offset + count > 0x10000)
+                count = 0x10000 - offset;
+
+        /*
+         * wait up to 30 sec for this block
+         */
+        timeout = jiffies + 30 * HZ;
+
+        for (offset = 0; offset < count; offset++, pWritePtr++) {
+                uAddress = (unsigned int) pWritePtr;
+                uAddress &= 0xFFFFFFFC;
+                if (__get_user(c2, buf + offset))
+                        return -EFAULT;
+
+          WriteRetry:
+                /*
+                 * dummy read
+                 */
+                c1 = *(volatile unsigned char *) (FLASH_BASE + 0x8000);
+
+                /*
+                 * kick open the write gate
+                 */
+                kick_open();
+
+                /*
+                 * program footbridge to the correct offset...0..3
+                 */
+                *CSR_ROMWRITEREG = (unsigned int) pWritePtr & 3;
+
+                /*
+                 * write cmd
+                 */
+                *(volatile unsigned char *) (uAddress) = 0x40;
+
+                /*
+                 * data to write
+                 */
+                *(volatile unsigned char *) (uAddress) = c2;
+
+                /*
+                 * get status
+                 */
+                *(volatile unsigned char *) (FLASH_BASE + 0x10000) = 0x70;
+
+                c1 = 0;
+
+                /*
+                 * wait up to 1 sec for this byte
+                 */
+                timeout1 = jiffies + 1 * HZ;
+
+                /*
+                 * while not ready...
+                 */
+                while (!(c1 & 0x80) && time_before(jiffies, timeout1))
+                        c1 = *(volatile unsigned char *) (FLASH_BASE + 0x8000);
+
+                /*
+                 * if timeout getting status
+                 */
+                if (time_after_eq(jiffies, timeout1)) {
+                        kick_open();
+                        /*
+                         * reset err
+                         */
+                        *(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x50;
+
+                        goto WriteRetry;
+                }
+                /*
+                 * switch on read access, as a default flash operation mode
+                 */
+                kick_open();
+                /*
+                 * read access
+                 */
+                *(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0xFF;
+
+                /*
+                 * if hardware reports an error writing, and not timeout - 
+                 * reset the chip and retry
+                 */
+                if (c1 & 0x10) {
+                        kick_open();
+                        /*
+                         * reset err
+                         */
+                        *(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x50;
+
+                        /*
+                         * before timeout?
+                         */
+                        if (time_before(jiffies, timeout)) {
+                                if (flashdebug)
+                                        printk(KERN_DEBUG "write_block: Retrying write at 0x%X)n",
+                                               pWritePtr - FLASH_BASE);
+
+                                /*
+                                 * no LED == waiting
+                                 */
+                                leds_event(led_amber_off);
+                                /*
+                                 * wait couple ms
+                                 */
+                                msleep(10);
+                                /*
+                                 * red LED == write
+                                 */
+                                leds_event(led_red_on);
+
+                                goto WriteRetry;
+                        } else {
+                                printk(KERN_ERR "write_block: timeout at 0x%X\n",
+                                       pWritePtr - FLASH_BASE);
+                                /*
+                                 * return error -2
+                                 */
+                                return -2;
+
+                        }
+                }
+        }
+
+        /*
+         * green LED == read/verify
+         */
+        leds_event(led_amber_off);
+        leds_event(led_green_on);
+
+        msleep(10);
+
+        pWritePtr = (unsigned char *) ((unsigned int) (FLASH_BASE + p));
+
+        for (offset = 0; offset < count; offset++) {
+                char c, c1;
+                if (__get_user(c, buf))
+                        return -EFAULT;
+                buf++;
+                if ((c1 = *pWritePtr++) != c) {
+                        printk(KERN_ERR "write_block: verify error at 0x%X (%02X!=%02X)\n",
+                               pWritePtr - FLASH_BASE, c1, c);
+                        return 0;
+                }
+        }
+
+        return count;
+}
+
+
+static void kick_open(void)
+{
+        unsigned long flags;
+
+        /*
+         * we want to write a bit pattern XXX1 to Xilinx to enable
+         * the write gate, which will be open for about the next 2ms.
+         */
+        spin_lock_irqsave(&gpio_lock, flags);
+        cpld_modify(1, 1);
+        spin_unlock_irqrestore(&gpio_lock, flags);
+
+        /*
+         * let the ISA bus to catch on...
+         */
+        udelay(25);
+}
+
+static struct file_operations flash_fops =
+{
+        .owner          = THIS_MODULE,
+        .llseek         = flash_llseek,
+        .read           = flash_read,
+        .write          = flash_write,
+        .ioctl          = flash_ioctl,
+};
+
+static struct miscdevice flash_miscdev =
+{
+        FLASH_MINOR,
+        "nwflash",
+        &flash_fops
+};
+
+static int __init nwflash_init(void)
+{
+        int ret = -ENODEV;
+
+        if (machine_is_netwinder()) {
+                int id;
+
+                FLASH_BASE = ioremap(DC21285_FLASH, KFLASH_SIZE4);
+                if (!FLASH_BASE)
+                        goto out;
+
+                id = get_flash_id();
+                if ((id != KFLASH_ID) && (id != KFLASH_ID4)) {
+                        ret = -ENXIO;
+                        iounmap((void *)FLASH_BASE);
+                        printk("Flash: incorrect ID 0x%04X.\n", id);
+                        goto out;
+                }
+
+                printk("Flash ROM driver v.%s, flash device ID 0x%04X, size %d Mb.\n",
+                       NWFLASH_VERSION, id, gbFlashSize / (1024 * 1024));
+
+                ret = misc_register(&flash_miscdev);
+                if (ret < 0) {
+                        iounmap((void *)FLASH_BASE);
+                }
+        }
+out:
+        return ret;
+}
+
+static void __exit nwflash_exit(void)
+{
+        misc_deregister(&flash_miscdev);
+        iounmap((void *)FLASH_BASE);
+}
+
+MODULE_LICENSE("GPL");
+
+module_param(flashdebug, bool, 0644);
+
+module_init(nwflash_init);
+module_exit(nwflash_exit);