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From e5ca5b21330a683329e2912786f6b7cecbc5d5c9 Mon Sep 17 00:00:00 2001
From: Andrea Adami <andrea.adami@gmail.com>
Date: Wed, 11 Dec 2013 00:27:34 +0100
Subject: [PATCH] cfi_probe.c: hack to reset Partition Control Register
on collie
Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
---
drivers/mtd/chips/cfi_probe.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/mtd/chips/cfi_probe.c b/drivers/mtd/chips/cfi_probe.c
index d255352..e2e80db 100644
--- a/drivers/mtd/chips/cfi_probe.c
+++ b/drivers/mtd/chips/cfi_probe.c
@@ -228,6 +228,40 @@ static int __xipram cfi_chip_setup(struct map_info *map,
cfi->mfr = cfi_read_query16(map, base);
cfi->id = cfi_read_query16(map, base + ofs_factor);
+
+
+
+ /* read PCR */
+ unsigned long PCR, SR;
+ PCR = cfi_read_query16(map, base + 6 * ofs_factor);
+ printk ("Partition Configuration Register was:%lx\n", PCR);
+
+ /* Set PCR two-cycle command sequence.
+ * After executing this command, the device
+ * returns to read array mode and status registers are cleared
+ */
+ cfi_send_gen_cmd(0x60, 0x0000, base, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0x04, 0x0000, base, map, cfi, cfi->device_type, NULL);
+
+ /* chech Status Register */
+ cfi_send_gen_cmd(0x70, 0, base, map, cfi, cfi->device_type, NULL);
+ SR = cfi_read_query16(map, base + 6 * ofs_factor);
+
+ /* Check SR.4, 5
+ * Both 1 = Command Sequence Error
+ */
+ printk ("Status Register is:%lx\n", SR);
+
+
+ /* read again PCR */
+ cfi_send_gen_cmd(0x90, addr_unlock1, 0, map, cfi, cfi->device_type, NULL);
+ PCR = cfi_read_query16(map, base + 6 * ofs_factor);
+ printk ("Partition Configuration Register is now:%lx\n", PCR);
+
+
+
+
+
/* Get AMD/Spansion extended JEDEC ID */
if (cfi->mfr == CFI_MFR_AMD && (cfi->id & 0xff) == 0x7e)
cfi->id = cfi_read_query(map, base + 0xe * ofs_factor) << 8 |
--
1.8.1.5
|
