Nikolai Artemiev has uploaded this change for review.

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sst49lfxxxc.c: add unlock function for SST chips

Function imported from cros flashrom at
`1f38d1ab13d72912fc2d90c7e964dd15e9ec2c9b`

Change-Id: I019bbb622b2348a05e7d03fbd0aa3bfac5f81175
Signed-off-by: Nikolai Artemiev <nartemiev@google.com>
---
M chipdrivers.h
M sst49lfxxxc.c
2 files changed, 38 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/08/48108/1

diff --git a/chipdrivers.h b/chipdrivers.h
index cf03811..82ac3a2 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -165,6 +165,7 @@
 
 /* sst49lfxxxc.c */
 int erase_sector_49lfxxxc(struct flashctx *flash, unsigned int address, unsigned int sector_size);
+int unlock_49lfxxxc(struct flashctx *flash);
 
 /* sst_fwhub.c */
 int printlock_sst_fwhub(struct flashctx *flash);
diff --git a/sst49lfxxxc.c b/sst49lfxxxc.c
index a69ab75..9bb4d5d 100644
--- a/sst49lfxxxc.c
+++ b/sst49lfxxxc.c
@@ -18,6 +18,43 @@
 
 #include "flash.h"
 #include "chipdrivers.h"
+#include <inttypes.h>
+
+static int write_lockbits_block_49lfxxxc(struct flashctx *flash, unsigned long address, unsigned char bits)
+{
+	unsigned long lock = flash->virtual_registers + address + 2;
+	msg_cdbg("lockbits at address=0x%08lx is 0x%01x\n", lock, chip_readb(flash, lock));
+	chip_writeb(flash, bits, lock);
+
+	return 0;
+}
+
+static int write_lockbits_49lfxxxc(struct flashctx *flash, unsigned char bits)
+{
+	chipaddr registers = flash->virtual_registers;
+	unsigned int i, left = flash->chip->total_size * 1024;
+	unsigned long address;
+
+	msg_cdbg("\nbios=0x%08" PRIxPTR "\n", registers);
+	for (i = 0; left > 65536; i++, left -= 65536) {
+		write_lockbits_block_49lfxxxc(flash, i * 65536, bits);
+	}
+	address = i * 65536;
+	write_lockbits_block_49lfxxxc(flash, address, bits);
+	address += 32768;
+	write_lockbits_block_49lfxxxc(flash, address, bits);
+	address += 8192;
+	write_lockbits_block_49lfxxxc(flash, address, bits);
+	address += 8192;
+	write_lockbits_block_49lfxxxc(flash, address, bits);
+
+	return 0;
+}
+
+int unlock_49lfxxxc(struct flashctx *flash)
+{
+	return write_lockbits_49lfxxxc(flash, 0);
+}
 
 int erase_sector_49lfxxxc(struct flashctx *flash, unsigned int address,
 			  unsigned int sector_size)

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