mtd: cfi_cmdset_0002: Add reboot notifier for AMD flashes

Ensure that the flash device is in a quiescent state before rebooting.
The implementation is closely modeled after the cfi_cmdset_0001 reboot
notifier, commit 963a6fb0a0d336d0513083b7e4b5c3ff9d6d2061 .

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index c93e47d21ce0..c16b8cecc3a8 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -32,6 +32,7 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
+#include <linux/reboot.h>
 #include <linux/mtd/compatmac.h>
 #include <linux/mtd/map.h>
 #include <linux/mtd/mtd.h>
@@ -56,6 +57,7 @@ static int cfi_amdstd_erase_varsize(struct mtd_info *, struct erase_info *);
 static void cfi_amdstd_sync (struct mtd_info *);
 static int cfi_amdstd_suspend (struct mtd_info *);
 static void cfi_amdstd_resume (struct mtd_info *);
+static int cfi_amdstd_reboot(struct notifier_block *, unsigned long, void *);
 static int cfi_amdstd_secsi_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
 
 static void cfi_amdstd_destroy(struct mtd_info *);
@@ -351,6 +353,8 @@ struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)
         mtd->name    = map->name;
         mtd->writesize = 1;
 
+        mtd->reboot_notifier.notifier_call = cfi_amdstd_reboot;
+
         if (cfi->cfi_mode==CFI_MODE_CFI){
                 unsigned char bootloc;
                 /*
@@ -487,6 +491,7 @@ static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd)
 #endif
 
         __module_get(THIS_MODULE);
+        register_reboot_notifier(&mtd->reboot_notifier);
         return mtd;
 
  setup_err:
@@ -628,6 +633,10 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
                 chip->state = FL_READY;
                 return 0;
 
+        case FL_SHUTDOWN:
+                /* The machine is rebooting */
+                return -EIO;
+
         case FL_POINT:
                 /* Only if there's no operation suspended... */
                 if (mode == FL_READY && chip->oldstate == FL_READY)
@@ -1918,11 +1927,58 @@ static void cfi_amdstd_resume(struct mtd_info *mtd)
         }
 }
 
+
+/*
+ * Ensure that the flash device is put back into read array mode before
+ * unloading the driver or rebooting.  On some systems, rebooting while
+ * the flash is in query/program/erase mode will prevent the CPU from
+ * fetching the bootloader code, requiring a hard reset or power cycle.
+ */
+static int cfi_amdstd_reset(struct mtd_info *mtd)
+{
+        struct map_info *map = mtd->priv;
+        struct cfi_private *cfi = map->fldrv_priv;
+        int i, ret;
+        struct flchip *chip;
+
+        for (i = 0; i < cfi->numchips; i++) {
+
+                chip = &cfi->chips[i];
+
+                mutex_lock(&chip->mutex);
+
+                ret = get_chip(map, chip, chip->start, FL_SHUTDOWN);
+                if (!ret) {
+                        map_write(map, CMD(0xF0), chip->start);
+                        chip->state = FL_SHUTDOWN;
+                        put_chip(map, chip, chip->start);
+                }
+
+                mutex_unlock(&chip->mutex);
+        }
+
+        return 0;
+}
+
+
+static int cfi_amdstd_reboot(struct notifier_block *nb, unsigned long val,
+                               void *v)
+{
+        struct mtd_info *mtd;
+
+        mtd = container_of(nb, struct mtd_info, reboot_notifier);
+        cfi_amdstd_reset(mtd);
+        return NOTIFY_DONE;
+}
+
+
 static void cfi_amdstd_destroy(struct mtd_info *mtd)
 {
         struct map_info *map = mtd->priv;
         struct cfi_private *cfi = map->fldrv_priv;
 
+        cfi_amdstd_reset(mtd);
+        unregister_reboot_notifier(&mtd->reboot_notifier);
         kfree(cfi->cmdset_priv);
         kfree(cfi->cfiq);
         kfree(cfi);