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626 lines
13 KiB
626 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Flash memory interface rev.5 driver for the Intel |
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* Flash chips used on the NetWinder. |
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* |
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* 20/08/2000 RMK use __ioremap to map flash into virtual memory |
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* make a few more places use "volatile" |
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* 22/05/2001 RMK - Lock read against write |
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* - merge printk level changes (with mods) from Alan Cox. |
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* - use *ppos as the file position, not file->f_pos. |
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* - fix check for out of range pos and r/w size |
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* |
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* Please note that we are tampering with the only flash chip in the |
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* machine, which contains the bootup code. We therefore have the |
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* power to convert these machines into doorstops... |
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*/ |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/fs.h> |
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#include <linux/errno.h> |
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#include <linux/mm.h> |
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#include <linux/delay.h> |
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#include <linux/proc_fs.h> |
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#include <linux/miscdevice.h> |
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#include <linux/spinlock.h> |
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#include <linux/rwsem.h> |
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#include <linux/init.h> |
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#include <linux/mutex.h> |
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#include <linux/jiffies.h> |
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#include <asm/hardware/dec21285.h> |
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#include <asm/io.h> |
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#include <asm/mach-types.h> |
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#include <linux/uaccess.h> |
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/*****************************************************************************/ |
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#include <asm/nwflash.h> |
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|
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#define NWFLASH_VERSION "6.4" |
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|
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static DEFINE_MUTEX(flash_mutex); |
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static void kick_open(void); |
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static int get_flash_id(void); |
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static int erase_block(int nBlock); |
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static int write_block(unsigned long p, const char __user *buf, int count); |
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|
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#define KFLASH_SIZE 1024*1024 //1 Meg |
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#define KFLASH_SIZE4 4*1024*1024 //4 Meg |
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#define KFLASH_ID 0x89A6 //Intel flash |
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#define KFLASH_ID4 0xB0D4 //Intel flash 4Meg |
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static bool flashdebug; //if set - we will display progress msgs |
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|
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static int gbWriteEnable; |
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static int gbWriteBase64Enable; |
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static volatile unsigned char *FLASH_BASE; |
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static int gbFlashSize = KFLASH_SIZE; |
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static DEFINE_MUTEX(nwflash_mutex); |
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static int get_flash_id(void) |
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{ |
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volatile unsigned int c1, c2; |
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/* |
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* try to get flash chip ID |
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*/ |
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kick_open(); |
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c2 = inb(0x80); |
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*(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x90; |
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udelay(15); |
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c1 = *(volatile unsigned char *) FLASH_BASE; |
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c2 = inb(0x80); |
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|
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/* |
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* on 4 Meg flash the second byte is actually at offset 2... |
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*/ |
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if (c1 == 0xB0) |
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c2 = *(volatile unsigned char *) (FLASH_BASE + 2); |
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else |
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c2 = *(volatile unsigned char *) (FLASH_BASE + 1); |
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c2 += (c1 << 8); |
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/* |
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* set it back to read mode |
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*/ |
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*(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0xFF; |
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if (c2 == KFLASH_ID4) |
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gbFlashSize = KFLASH_SIZE4; |
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return c2; |
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} |
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static long flash_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) |
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{ |
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mutex_lock(&flash_mutex); |
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switch (cmd) { |
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case CMD_WRITE_DISABLE: |
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gbWriteBase64Enable = 0; |
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gbWriteEnable = 0; |
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break; |
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case CMD_WRITE_ENABLE: |
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gbWriteEnable = 1; |
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break; |
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case CMD_WRITE_BASE64K_ENABLE: |
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gbWriteBase64Enable = 1; |
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break; |
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default: |
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gbWriteBase64Enable = 0; |
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gbWriteEnable = 0; |
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mutex_unlock(&flash_mutex); |
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return -EINVAL; |
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} |
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mutex_unlock(&flash_mutex); |
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return 0; |
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} |
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static ssize_t flash_read(struct file *file, char __user *buf, size_t size, |
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loff_t *ppos) |
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{ |
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ssize_t ret; |
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if (flashdebug) |
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printk(KERN_DEBUG "flash_read: flash_read: offset=0x%llx, " |
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"buffer=%p, count=0x%zx.\n", *ppos, buf, size); |
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/* |
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* We now lock against reads and writes. --rmk |
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*/ |
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if (mutex_lock_interruptible(&nwflash_mutex)) |
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return -ERESTARTSYS; |
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ret = simple_read_from_buffer(buf, size, ppos, (void *)FLASH_BASE, gbFlashSize); |
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mutex_unlock(&nwflash_mutex); |
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return ret; |
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} |
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static ssize_t flash_write(struct file *file, const char __user *buf, |
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size_t size, loff_t * ppos) |
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{ |
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unsigned long p = *ppos; |
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unsigned int count = size; |
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int written; |
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int nBlock, temp, rc; |
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int i, j; |
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if (flashdebug) |
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printk("flash_write: offset=0x%lX, buffer=0x%p, count=0x%X.\n", |
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p, buf, count); |
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if (!gbWriteEnable) |
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return -EINVAL; |
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if (p < 64 * 1024 && (!gbWriteBase64Enable)) |
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return -EINVAL; |
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/* |
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* check for out of range pos or count |
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*/ |
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if (p >= gbFlashSize) |
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return count ? -ENXIO : 0; |
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if (count > gbFlashSize - p) |
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count = gbFlashSize - p; |
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if (!access_ok(buf, count)) |
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return -EFAULT; |
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/* |
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* We now lock against reads and writes. --rmk |
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*/ |
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if (mutex_lock_interruptible(&nwflash_mutex)) |
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return -ERESTARTSYS; |
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written = 0; |
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nBlock = (int) p >> 16; //block # of 64K bytes |
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/* |
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* # of 64K blocks to erase and write |
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*/ |
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temp = ((int) (p + count) >> 16) - nBlock + 1; |
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/* |
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* write ends at exactly 64k boundary? |
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*/ |
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if (((int) (p + count) & 0xFFFF) == 0) |
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temp -= 1; |
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if (flashdebug) |
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printk(KERN_DEBUG "flash_write: writing %d block(s) " |
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"starting at %d.\n", temp, nBlock); |
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for (; temp; temp--, nBlock++) { |
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if (flashdebug) |
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printk(KERN_DEBUG "flash_write: erasing block %d.\n", nBlock); |
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/* |
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* first we have to erase the block(s), where we will write... |
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*/ |
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i = 0; |
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j = 0; |
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RetryBlock: |
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do { |
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rc = erase_block(nBlock); |
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i++; |
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} while (rc && i < 10); |
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if (rc) { |
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printk(KERN_ERR "flash_write: erase error %x\n", rc); |
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break; |
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} |
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if (flashdebug) |
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printk(KERN_DEBUG "flash_write: writing offset %lX, " |
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"from buf %p, bytes left %X.\n", p, buf, |
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count - written); |
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/* |
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* write_block will limit write to space left in this block |
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*/ |
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rc = write_block(p, buf, count - written); |
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j++; |
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/* |
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* if somehow write verify failed? Can't happen?? |
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*/ |
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if (!rc) { |
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/* |
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* retry up to 10 times |
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*/ |
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if (j < 10) |
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goto RetryBlock; |
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else |
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/* |
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* else quit with error... |
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*/ |
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rc = -1; |
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} |
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if (rc < 0) { |
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printk(KERN_ERR "flash_write: write error %X\n", rc); |
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break; |
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} |
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p += rc; |
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buf += rc; |
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written += rc; |
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*ppos += rc; |
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if (flashdebug) |
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printk(KERN_DEBUG "flash_write: written 0x%X bytes OK.\n", written); |
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} |
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mutex_unlock(&nwflash_mutex); |
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return written; |
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} |
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/* |
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* The memory devices use the full 32/64 bits of the offset, and so we cannot |
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* check against negative addresses: they are ok. The return value is weird, |
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* though, in that case (0). |
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* |
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* also note that seeking relative to the "end of file" isn't supported: |
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* it has no meaning, so it returns -EINVAL. |
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*/ |
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static loff_t flash_llseek(struct file *file, loff_t offset, int orig) |
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{ |
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loff_t ret; |
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mutex_lock(&flash_mutex); |
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if (flashdebug) |
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printk(KERN_DEBUG "flash_llseek: offset=0x%X, orig=0x%X.\n", |
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(unsigned int) offset, orig); |
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ret = no_seek_end_llseek_size(file, offset, orig, gbFlashSize); |
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mutex_unlock(&flash_mutex); |
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return ret; |
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} |
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/* |
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* assume that main Write routine did the parameter checking... |
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* so just go ahead and erase, what requested! |
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*/ |
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static int erase_block(int nBlock) |
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{ |
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volatile unsigned int c1; |
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volatile unsigned char *pWritePtr; |
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unsigned long timeout; |
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int temp, temp1; |
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/* |
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* reset footbridge to the correct offset 0 (...0..3) |
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*/ |
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*CSR_ROMWRITEREG = 0; |
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/* |
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* dummy ROM read |
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*/ |
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c1 = *(volatile unsigned char *) (FLASH_BASE + 0x8000); |
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kick_open(); |
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/* |
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* reset status if old errors |
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*/ |
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*(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x50; |
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/* |
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* erase a block... |
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* aim at the middle of a current block... |
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*/ |
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pWritePtr = (unsigned char *) ((unsigned int) (FLASH_BASE + 0x8000 + (nBlock << 16))); |
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/* |
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* dummy read |
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*/ |
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c1 = *pWritePtr; |
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kick_open(); |
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/* |
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* erase |
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*/ |
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*(volatile unsigned char *) pWritePtr = 0x20; |
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/* |
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* confirm |
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*/ |
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*(volatile unsigned char *) pWritePtr = 0xD0; |
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/* |
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* wait 10 ms |
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*/ |
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msleep(10); |
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/* |
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* wait while erasing in process (up to 10 sec) |
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*/ |
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timeout = jiffies + 10 * HZ; |
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c1 = 0; |
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while (!(c1 & 0x80) && time_before(jiffies, timeout)) { |
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msleep(10); |
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/* |
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* read any address |
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*/ |
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c1 = *(volatile unsigned char *) (pWritePtr); |
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// printk("Flash_erase: status=%X.\n",c1); |
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} |
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/* |
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* set flash for normal read access |
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*/ |
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kick_open(); |
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// *(volatile unsigned char*)(FLASH_BASE+0x8000) = 0xFF; |
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*(volatile unsigned char *) pWritePtr = 0xFF; //back to normal operation |
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/* |
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* check if erase errors were reported |
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*/ |
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if (c1 & 0x20) { |
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printk(KERN_ERR "flash_erase: err at %p\n", pWritePtr); |
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/* |
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* reset error |
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*/ |
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*(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x50; |
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return -2; |
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} |
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/* |
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* just to make sure - verify if erased OK... |
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*/ |
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msleep(10); |
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pWritePtr = (unsigned char *) ((unsigned int) (FLASH_BASE + (nBlock << 16))); |
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for (temp = 0; temp < 16 * 1024; temp++, pWritePtr += 4) { |
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if ((temp1 = *(volatile unsigned int *) pWritePtr) != 0xFFFFFFFF) { |
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printk(KERN_ERR "flash_erase: verify err at %p = %X\n", |
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pWritePtr, temp1); |
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return -1; |
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} |
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} |
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return 0; |
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} |
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/* |
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* write_block will limit number of bytes written to the space in this block |
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*/ |
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static int write_block(unsigned long p, const char __user *buf, int count) |
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{ |
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volatile unsigned int c1; |
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volatile unsigned int c2; |
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unsigned char *pWritePtr; |
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unsigned int uAddress; |
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unsigned int offset; |
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unsigned long timeout; |
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unsigned long timeout1; |
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pWritePtr = (unsigned char *) ((unsigned int) (FLASH_BASE + p)); |
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/* |
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* check if write will end in this block.... |
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*/ |
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offset = p & 0xFFFF; |
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if (offset + count > 0x10000) |
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count = 0x10000 - offset; |
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/* |
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* wait up to 30 sec for this block |
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*/ |
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timeout = jiffies + 30 * HZ; |
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for (offset = 0; offset < count; offset++, pWritePtr++) { |
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uAddress = (unsigned int) pWritePtr; |
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uAddress &= 0xFFFFFFFC; |
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if (__get_user(c2, buf + offset)) |
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return -EFAULT; |
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WriteRetry: |
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/* |
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* dummy read |
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*/ |
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c1 = *(volatile unsigned char *) (FLASH_BASE + 0x8000); |
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/* |
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* kick open the write gate |
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*/ |
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kick_open(); |
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/* |
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* program footbridge to the correct offset...0..3 |
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*/ |
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*CSR_ROMWRITEREG = (unsigned int) pWritePtr & 3; |
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/* |
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* write cmd |
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*/ |
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*(volatile unsigned char *) (uAddress) = 0x40; |
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/* |
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* data to write |
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*/ |
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*(volatile unsigned char *) (uAddress) = c2; |
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/* |
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* get status |
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*/ |
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*(volatile unsigned char *) (FLASH_BASE + 0x10000) = 0x70; |
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c1 = 0; |
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/* |
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* wait up to 1 sec for this byte |
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*/ |
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timeout1 = jiffies + 1 * HZ; |
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/* |
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* while not ready... |
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*/ |
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while (!(c1 & 0x80) && time_before(jiffies, timeout1)) |
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c1 = *(volatile unsigned char *) (FLASH_BASE + 0x8000); |
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/* |
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* if timeout getting status |
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*/ |
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if (time_after_eq(jiffies, timeout1)) { |
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kick_open(); |
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/* |
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* reset err |
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*/ |
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*(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x50; |
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goto WriteRetry; |
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} |
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/* |
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* switch on read access, as a default flash operation mode |
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*/ |
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kick_open(); |
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/* |
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* read access |
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*/ |
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*(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0xFF; |
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/* |
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* if hardware reports an error writing, and not timeout - |
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* reset the chip and retry |
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*/ |
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if (c1 & 0x10) { |
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kick_open(); |
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/* |
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* reset err |
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*/ |
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*(volatile unsigned char *) (FLASH_BASE + 0x8000) = 0x50; |
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/* |
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* before timeout? |
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*/ |
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if (time_before(jiffies, timeout)) { |
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if (flashdebug) |
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printk(KERN_DEBUG "write_block: Retrying write at 0x%X)n", |
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pWritePtr - FLASH_BASE); |
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/* |
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* wait couple ms |
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*/ |
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msleep(10); |
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goto WriteRetry; |
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} else { |
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printk(KERN_ERR "write_block: timeout at 0x%X\n", |
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pWritePtr - FLASH_BASE); |
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/* |
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* return error -2 |
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*/ |
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return -2; |
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} |
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} |
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} |
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msleep(10); |
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pWritePtr = (unsigned char *) ((unsigned int) (FLASH_BASE + p)); |
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for (offset = 0; offset < count; offset++) { |
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char c, c1; |
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if (__get_user(c, buf)) |
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return -EFAULT; |
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buf++; |
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if ((c1 = *pWritePtr++) != c) { |
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printk(KERN_ERR "write_block: verify error at 0x%X (%02X!=%02X)\n", |
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pWritePtr - FLASH_BASE, c1, c); |
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return 0; |
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} |
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} |
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return count; |
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} |
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static void kick_open(void) |
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{ |
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unsigned long flags; |
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/* |
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* we want to write a bit pattern XXX1 to Xilinx to enable |
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* the write gate, which will be open for about the next 2ms. |
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*/ |
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raw_spin_lock_irqsave(&nw_gpio_lock, flags); |
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nw_cpld_modify(CPLD_FLASH_WR_ENABLE, CPLD_FLASH_WR_ENABLE); |
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raw_spin_unlock_irqrestore(&nw_gpio_lock, flags); |
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/* |
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* let the ISA bus to catch on... |
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*/ |
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udelay(25); |
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} |
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static const struct file_operations flash_fops = |
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{ |
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.owner = THIS_MODULE, |
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.llseek = flash_llseek, |
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.read = flash_read, |
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.write = flash_write, |
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.unlocked_ioctl = flash_ioctl, |
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}; |
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static struct miscdevice flash_miscdev = |
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{ |
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NWFLASH_MINOR, |
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"nwflash", |
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&flash_fops |
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}; |
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static int __init nwflash_init(void) |
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{ |
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int ret = -ENODEV; |
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if (machine_is_netwinder()) { |
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int id; |
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FLASH_BASE = ioremap(DC21285_FLASH, KFLASH_SIZE4); |
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if (!FLASH_BASE) |
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goto out; |
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id = get_flash_id(); |
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if ((id != KFLASH_ID) && (id != KFLASH_ID4)) { |
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ret = -ENXIO; |
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iounmap((void *)FLASH_BASE); |
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printk("Flash: incorrect ID 0x%04X.\n", id); |
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goto out; |
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} |
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printk("Flash ROM driver v.%s, flash device ID 0x%04X, size %d Mb.\n", |
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NWFLASH_VERSION, id, gbFlashSize / (1024 * 1024)); |
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ret = misc_register(&flash_miscdev); |
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if (ret < 0) { |
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iounmap((void *)FLASH_BASE); |
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} |
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} |
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out: |
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return ret; |
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} |
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static void __exit nwflash_exit(void) |
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{ |
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misc_deregister(&flash_miscdev); |
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iounmap((void *)FLASH_BASE); |
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} |
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MODULE_LICENSE("GPL"); |
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module_param(flashdebug, bool, 0644); |
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module_init(nwflash_init); |
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module_exit(nwflash_exit);
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