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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mtd/chips/sharp.c
Linux-2.6.12-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!
Diffstat (limited to 'drivers/mtd/chips/sharp.c')
-rw-r--r--drivers/mtd/chips/sharp.c596
1 files changed, 596 insertions, 0 deletions
diff --git a/drivers/mtd/chips/sharp.c b/drivers/mtd/chips/sharp.c
new file mode 100644
index 00000000000..c3cf0f63bc9
--- /dev/null
+++ b/drivers/mtd/chips/sharp.c
@@ -0,0 +1,596 @@
+/*
+ * MTD chip driver for pre-CFI Sharp flash chips
+ *
+ * Copyright 2000,2001 David A. Schleef <ds@schleef.org>
+ * 2000,2001 Lineo, Inc.
+ *
+ * $Id: sharp.c,v 1.14 2004/08/09 13:19:43 dwmw2 Exp $
+ *
+ * Devices supported:
+ * LH28F016SCT Symmetrical block flash memory, 2Mx8
+ * LH28F008SCT Symmetrical block flash memory, 1Mx8
+ *
+ * Documentation:
+ * http://www.sharpmeg.com/datasheets/memic/flashcmp/
+ * http://www.sharpmeg.com/datasheets/memic/flashcmp/01symf/16m/016sctl9.pdf
+ * 016sctl9.pdf
+ *
+ * Limitations:
+ * This driver only supports 4x1 arrangement of chips.
+ * Not tested on anything but PowerPC.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/cfi.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+
+#define CMD_RESET 0xffffffff
+#define CMD_READ_ID 0x90909090
+#define CMD_READ_STATUS 0x70707070
+#define CMD_CLEAR_STATUS 0x50505050
+#define CMD_BLOCK_ERASE_1 0x20202020
+#define CMD_BLOCK_ERASE_2 0xd0d0d0d0
+#define CMD_BYTE_WRITE 0x40404040
+#define CMD_SUSPEND 0xb0b0b0b0
+#define CMD_RESUME 0xd0d0d0d0
+#define CMD_SET_BLOCK_LOCK_1 0x60606060
+#define CMD_SET_BLOCK_LOCK_2 0x01010101
+#define CMD_SET_MASTER_LOCK_1 0x60606060
+#define CMD_SET_MASTER_LOCK_2 0xf1f1f1f1
+#define CMD_CLEAR_BLOCK_LOCKS_1 0x60606060
+#define CMD_CLEAR_BLOCK_LOCKS_2 0xd0d0d0d0
+
+#define SR_READY 0x80808080 // 1 = ready
+#define SR_ERASE_SUSPEND 0x40404040 // 1 = block erase suspended
+#define SR_ERROR_ERASE 0x20202020 // 1 = error in block erase or clear lock bits
+#define SR_ERROR_WRITE 0x10101010 // 1 = error in byte write or set lock bit
+#define SR_VPP 0x08080808 // 1 = Vpp is low
+#define SR_WRITE_SUSPEND 0x04040404 // 1 = byte write suspended
+#define SR_PROTECT 0x02020202 // 1 = lock bit set
+#define SR_RESERVED 0x01010101
+
+#define SR_ERRORS (SR_ERROR_ERASE|SR_ERROR_WRITE|SR_VPP|SR_PROTECT)
+
+/* Configuration options */
+
+#undef AUTOUNLOCK /* automatically unlocks blocks before erasing */
+
+struct mtd_info *sharp_probe(struct map_info *);
+
+static int sharp_probe_map(struct map_info *map,struct mtd_info *mtd);
+
+static int sharp_read(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf);
+static int sharp_write(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, const u_char *buf);
+static int sharp_erase(struct mtd_info *mtd, struct erase_info *instr);
+static void sharp_sync(struct mtd_info *mtd);
+static int sharp_suspend(struct mtd_info *mtd);
+static void sharp_resume(struct mtd_info *mtd);
+static void sharp_destroy(struct mtd_info *mtd);
+
+static int sharp_write_oneword(struct map_info *map, struct flchip *chip,
+ unsigned long adr, __u32 datum);
+static int sharp_erase_oneblock(struct map_info *map, struct flchip *chip,
+ unsigned long adr);
+#ifdef AUTOUNLOCK
+static void sharp_unlock_oneblock(struct map_info *map, struct flchip *chip,
+ unsigned long adr);
+#endif
+
+
+struct sharp_info{
+ struct flchip *chip;
+ int bogus;
+ int chipshift;
+ int numchips;
+ struct flchip chips[1];
+};
+
+struct mtd_info *sharp_probe(struct map_info *map);
+static void sharp_destroy(struct mtd_info *mtd);
+
+static struct mtd_chip_driver sharp_chipdrv = {
+ .probe = sharp_probe,
+ .destroy = sharp_destroy,
+ .name = "sharp",
+ .module = THIS_MODULE
+};
+
+
+struct mtd_info *sharp_probe(struct map_info *map)
+{
+ struct mtd_info *mtd = NULL;
+ struct sharp_info *sharp = NULL;
+ int width;
+
+ mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
+ if(!mtd)
+ return NULL;
+
+ sharp = kmalloc(sizeof(*sharp), GFP_KERNEL);
+ if(!sharp) {
+ kfree(mtd);
+ return NULL;
+ }
+
+ memset(mtd, 0, sizeof(*mtd));
+
+ width = sharp_probe_map(map,mtd);
+ if(!width){
+ kfree(mtd);
+ kfree(sharp);
+ return NULL;
+ }
+
+ mtd->priv = map;
+ mtd->type = MTD_NORFLASH;
+ mtd->erase = sharp_erase;
+ mtd->read = sharp_read;
+ mtd->write = sharp_write;
+ mtd->sync = sharp_sync;
+ mtd->suspend = sharp_suspend;
+ mtd->resume = sharp_resume;
+ mtd->flags = MTD_CAP_NORFLASH;
+ mtd->name = map->name;
+
+ memset(sharp, 0, sizeof(*sharp));
+ sharp->chipshift = 23;
+ sharp->numchips = 1;
+ sharp->chips[0].start = 0;
+ sharp->chips[0].state = FL_READY;
+ sharp->chips[0].mutex = &sharp->chips[0]._spinlock;
+ sharp->chips[0].word_write_time = 0;
+ init_waitqueue_head(&sharp->chips[0].wq);
+ spin_lock_init(&sharp->chips[0]._spinlock);
+
+ map->fldrv = &sharp_chipdrv;
+ map->fldrv_priv = sharp;
+
+ __module_get(THIS_MODULE);
+ return mtd;
+}
+
+static int sharp_probe_map(struct map_info *map,struct mtd_info *mtd)
+{
+ unsigned long tmp;
+ unsigned long base = 0;
+ u32 read0, read4;
+ int width = 4;
+
+ tmp = map_read32(map, base+0);
+
+ map_write32(map, CMD_READ_ID, base+0);
+
+ read0=map_read32(map, base+0);
+ read4=map_read32(map, base+4);
+ if(read0 == 0x89898989){
+ printk("Looks like sharp flash\n");
+ switch(read4){
+ case 0xaaaaaaaa:
+ case 0xa0a0a0a0:
+ /* aa - LH28F016SCT-L95 2Mx8, 32 64k blocks*/
+ /* a0 - LH28F016SCT-Z4 2Mx8, 32 64k blocks*/
+ mtd->erasesize = 0x10000 * width;
+ mtd->size = 0x200000 * width;
+ return width;
+ case 0xa6a6a6a6:
+ /* a6 - LH28F008SCT-L12 1Mx8, 16 64k blocks*/
+ /* a6 - LH28F008SCR-L85 1Mx8, 16 64k blocks*/
+ mtd->erasesize = 0x10000 * width;
+ mtd->size = 0x100000 * width;
+ return width;
+#if 0
+ case 0x00000000: /* unknown */
+ /* XX - LH28F004SCT 512kx8, 8 64k blocks*/
+ mtd->erasesize = 0x10000 * width;
+ mtd->size = 0x80000 * width;
+ return width;
+#endif
+ default:
+ printk("Sort-of looks like sharp flash, 0x%08x 0x%08x\n",
+ read0,read4);
+ }
+ }else if((map_read32(map, base+0) == CMD_READ_ID)){
+ /* RAM, probably */
+ printk("Looks like RAM\n");
+ map_write32(map, tmp, base+0);
+ }else{
+ printk("Doesn't look like sharp flash, 0x%08x 0x%08x\n",
+ read0,read4);
+ }
+
+ return 0;
+}
+
+/* This function returns with the chip->mutex lock held. */
+static int sharp_wait(struct map_info *map, struct flchip *chip)
+{
+ __u16 status;
+ unsigned long timeo = jiffies + HZ;
+ DECLARE_WAITQUEUE(wait, current);
+ int adr = 0;
+
+retry:
+ spin_lock_bh(chip->mutex);
+
+ switch(chip->state){
+ case FL_READY:
+ map_write32(map,CMD_READ_STATUS,adr);
+ chip->state = FL_STATUS;
+ case FL_STATUS:
+ status = map_read32(map,adr);
+//printk("status=%08x\n",status);
+
+ udelay(100);
+ if((status & SR_READY)!=SR_READY){
+//printk(".status=%08x\n",status);
+ udelay(100);
+ }
+ break;
+ default:
+ printk("Waiting for chip\n");
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&chip->wq, &wait);
+
+ spin_unlock_bh(chip->mutex);
+
+ schedule();
+ remove_wait_queue(&chip->wq, &wait);
+
+ if(signal_pending(current))
+ return -EINTR;
+
+ timeo = jiffies + HZ;
+
+ goto retry;
+ }
+
+ map_write32(map,CMD_RESET, adr);
+
+ chip->state = FL_READY;
+
+ return 0;
+}
+
+static void sharp_release(struct flchip *chip)
+{
+ wake_up(&chip->wq);
+ spin_unlock_bh(chip->mutex);
+}
+
+static int sharp_read(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct map_info *map = mtd->priv;
+ struct sharp_info *sharp = map->fldrv_priv;
+ int chipnum;
+ int ret = 0;
+ int ofs = 0;
+
+ chipnum = (from >> sharp->chipshift);
+ ofs = from & ((1 << sharp->chipshift)-1);
+
+ *retlen = 0;
+
+ while(len){
+ unsigned long thislen;
+
+ if(chipnum>=sharp->numchips)
+ break;
+
+ thislen = len;
+ if(ofs+thislen >= (1<<sharp->chipshift))
+ thislen = (1<<sharp->chipshift) - ofs;
+
+ ret = sharp_wait(map,&sharp->chips[chipnum]);
+ if(ret<0)
+ break;
+
+ map_copy_from(map,buf,ofs,thislen);
+
+ sharp_release(&sharp->chips[chipnum]);
+
+ *retlen += thislen;
+ len -= thislen;
+ buf += thislen;
+
+ ofs = 0;
+ chipnum++;
+ }
+ return ret;
+}
+
+static int sharp_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct map_info *map = mtd->priv;
+ struct sharp_info *sharp = map->fldrv_priv;
+ int ret = 0;
+ int i,j;
+ int chipnum;
+ unsigned long ofs;
+ union { u32 l; unsigned char uc[4]; } tbuf;
+
+ *retlen = 0;
+
+ while(len){
+ tbuf.l = 0xffffffff;
+ chipnum = to >> sharp->chipshift;
+ ofs = to & ((1<<sharp->chipshift)-1);
+
+ j=0;
+ for(i=ofs&3;i<4 && len;i++){
+ tbuf.uc[i] = *buf;
+ buf++;
+ to++;
+ len--;
+ j++;
+ }
+ sharp_write_oneword(map, &sharp->chips[chipnum], ofs&~3, tbuf.l);
+ if(ret<0)
+ return ret;
+ (*retlen)+=j;
+ }
+
+ return 0;
+}
+
+static int sharp_write_oneword(struct map_info *map, struct flchip *chip,
+ unsigned long adr, __u32 datum)
+{
+ int ret;
+ int timeo;
+ int try;
+ int i;
+ int status = 0;
+
+ ret = sharp_wait(map,chip);
+
+ for(try=0;try<10;try++){
+ map_write32(map,CMD_BYTE_WRITE,adr);
+ /* cpu_to_le32 -> hack to fix the writel be->le conversion */
+ map_write32(map,cpu_to_le32(datum),adr);
+
+ chip->state = FL_WRITING;
+
+ timeo = jiffies + (HZ/2);
+
+ map_write32(map,CMD_READ_STATUS,adr);
+ for(i=0;i<100;i++){
+ status = map_read32(map,adr);
+ if((status & SR_READY)==SR_READY)
+ break;
+ }
+ if(i==100){
+ printk("sharp: timed out writing\n");
+ }
+
+ if(!(status&SR_ERRORS))
+ break;
+
+ printk("sharp: error writing byte at addr=%08lx status=%08x\n",adr,status);
+
+ map_write32(map,CMD_CLEAR_STATUS,adr);
+ }
+ map_write32(map,CMD_RESET,adr);
+ chip->state = FL_READY;
+
+ wake_up(&chip->wq);
+ spin_unlock_bh(chip->mutex);
+
+ return 0;
+}
+
+static int sharp_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ struct map_info *map = mtd->priv;
+ struct sharp_info *sharp = map->fldrv_priv;
+ unsigned long adr,len;
+ int chipnum, ret=0;
+
+//printk("sharp_erase()\n");
+ if(instr->addr & (mtd->erasesize - 1))
+ return -EINVAL;
+ if(instr->len & (mtd->erasesize - 1))
+ return -EINVAL;
+ if(instr->len + instr->addr > mtd->size)
+ return -EINVAL;
+
+ chipnum = instr->addr >> sharp->chipshift;
+ adr = instr->addr & ((1<<sharp->chipshift)-1);
+ len = instr->len;
+
+ while(len){
+ ret = sharp_erase_oneblock(map, &sharp->chips[chipnum], adr);
+ if(ret)return ret;
+
+ adr += mtd->erasesize;
+ len -= mtd->erasesize;
+ if(adr >> sharp->chipshift){
+ adr = 0;
+ chipnum++;
+ if(chipnum>=sharp->numchips)
+ break;
+ }
+ }
+
+ instr->state = MTD_ERASE_DONE;
+ mtd_erase_callback(instr);
+
+ return 0;
+}
+
+static int sharp_do_wait_for_ready(struct map_info *map, struct flchip *chip,
+ unsigned long adr)
+{
+ int ret;
+ unsigned long timeo;
+ int status;
+ DECLARE_WAITQUEUE(wait, current);
+
+ map_write32(map,CMD_READ_STATUS,adr);
+ status = map_read32(map,adr);
+
+ timeo = jiffies + HZ;
+
+ while(time_before(jiffies, timeo)){
+ map_write32(map,CMD_READ_STATUS,adr);
+ status = map_read32(map,adr);
+ if((status & SR_READY)==SR_READY){
+ ret = 0;
+ goto out;
+ }
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&chip->wq, &wait);
+
+ //spin_unlock_bh(chip->mutex);
+
+ schedule_timeout(1);
+ schedule();
+ remove_wait_queue(&chip->wq, &wait);
+
+ //spin_lock_bh(chip->mutex);
+
+ if (signal_pending(current)){
+ ret = -EINTR;
+ goto out;
+ }
+
+ }
+ ret = -ETIME;
+out:
+ return ret;
+}
+
+static int sharp_erase_oneblock(struct map_info *map, struct flchip *chip,
+ unsigned long adr)
+{
+ int ret;
+ //int timeo;
+ int status;
+ //int i;
+
+//printk("sharp_erase_oneblock()\n");
+
+#ifdef AUTOUNLOCK
+ /* This seems like a good place to do an unlock */
+ sharp_unlock_oneblock(map,chip,adr);
+#endif
+
+ map_write32(map,CMD_BLOCK_ERASE_1,adr);
+ map_write32(map,CMD_BLOCK_ERASE_2,adr);
+
+ chip->state = FL_ERASING;
+
+ ret = sharp_do_wait_for_ready(map,chip,adr);
+ if(ret<0)return ret;
+
+ map_write32(map,CMD_READ_STATUS,adr);
+ status = map_read32(map,adr);
+
+ if(!(status&SR_ERRORS)){
+ map_write32(map,CMD_RESET,adr);
+ chip->state = FL_READY;
+ //spin_unlock_bh(chip->mutex);
+ return 0;
+ }
+
+ printk("sharp: error erasing block at addr=%08lx status=%08x\n",adr,status);
+ map_write32(map,CMD_CLEAR_STATUS,adr);
+
+ //spin_unlock_bh(chip->mutex);
+
+ return -EIO;
+}
+
+#ifdef AUTOUNLOCK
+static void sharp_unlock_oneblock(struct map_info *map, struct flchip *chip,
+ unsigned long adr)
+{
+ int i;
+ int status;
+
+ map_write32(map,CMD_CLEAR_BLOCK_LOCKS_1,adr);
+ map_write32(map,CMD_CLEAR_BLOCK_LOCKS_2,adr);
+
+ udelay(100);
+
+ status = map_read32(map,adr);
+ printk("status=%08x\n",status);
+
+ for(i=0;i<1000;i++){
+ //map_write32(map,CMD_READ_STATUS,adr);
+ status = map_read32(map,adr);
+ if((status & SR_READY)==SR_READY)
+ break;
+ udelay(100);
+ }
+ if(i==1000){
+ printk("sharp: timed out unlocking block\n");
+ }
+
+ if(!(status&SR_ERRORS)){
+ map_write32(map,CMD_RESET,adr);
+ chip->state = FL_READY;
+ return;
+ }
+
+ printk("sharp: error unlocking block at addr=%08lx status=%08x\n",adr,status);
+ map_write32(map,CMD_CLEAR_STATUS,adr);
+}
+#endif
+
+static void sharp_sync(struct mtd_info *mtd)
+{
+ //printk("sharp_sync()\n");
+}
+
+static int sharp_suspend(struct mtd_info *mtd)
+{
+ printk("sharp_suspend()\n");
+ return -EINVAL;
+}
+
+static void sharp_resume(struct mtd_info *mtd)
+{
+ printk("sharp_resume()\n");
+
+}
+
+static void sharp_destroy(struct mtd_info *mtd)
+{
+ printk("sharp_destroy()\n");
+
+}
+
+int __init sharp_probe_init(void)
+{
+ printk("MTD Sharp chip driver <ds@lineo.com>\n");
+
+ register_mtd_chip_driver(&sharp_chipdrv);
+
+ return 0;
+}
+
+static void __exit sharp_probe_exit(void)
+{
+ unregister_mtd_chip_driver(&sharp_chipdrv);
+}
+
+module_init(sharp_probe_init);
+module_exit(sharp_probe_exit);
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Schleef <ds@schleef.org>");
+MODULE_DESCRIPTION("Old MTD chip driver for pre-CFI Sharp flash chips");