Skip to content

GitLab

Commit fd7075ae authored by Carl-Daniel Hailfinger's avatar Carl-Daniel Hailfinger
Browse files

Add detailed status register printing and unlocking for all ATMEL AT25* chips 


Add support for Atmel AT25DF081A and AT25DQ161.

Some chips require EWSR before WRSR, others require WREN before WRSR,
and some support both variants. Add feature_bits to select the correct
SPI command, and default to EWSR.

Corresponding to flashrom svn r1115.
Signed-off-by: default avatarCarl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Tested-by: Steven Rosario
Acked-by: default avatarUwe Hermann <uwe@hermann-uwe.de>
parent f792c7d4
Hide whitespace changes
Inline Side-by-side
Showing with 442 additions and 29 deletions
chipdrivers.h
View file @ fd7075ae
......@@ -47,7 +47,17 @@ int spi_chip_write_1_new(struct flashchip *flash, uint8_t *buf, int start, int l
int spi_chip_write_256_new(struct flashchip *flash, uint8_t *buf, int start, int len);
int spi_chip_read(struct flashchip *flash, uint8_t *buf, int start, int len);
uint8_t spi_read_status_register(void);
int spi_prettyprint_status_register_at25df(struct flashchip *flash);
int spi_prettyprint_status_register_at25df_sec(struct flashchip *flash);
int spi_prettyprint_status_register_at25f(struct flashchip *flash);
int spi_prettyprint_status_register_at25fs010(struct flashchip *flash);
int spi_prettyprint_status_register_at25fs040(struct flashchip *flash);
int spi_disable_blockprotect(struct flashchip *flash);
int spi_disable_blockprotect_at25df(struct flashchip *flash);
int spi_disable_blockprotect_at25df_sec(struct flashchip *flash);
int spi_disable_blockprotect_at25f(struct flashchip *flash);
int spi_disable_blockprotect_at25fs010(struct flashchip *flash);
int spi_disable_blockprotect_at25fs040(struct flashchip *flash);
int spi_byte_program(int addr, uint8_t databyte);
int spi_nbyte_program(int addr, uint8_t *bytes, int len);
int spi_nbyte_read(int addr, uint8_t *bytes, int len);
......
flash.h
View file @ fd7075ae
......@@ -69,8 +69,9 @@ enum chipbustype {
/*
* How many different erase functions do we have per chip?
* Atmel AT25FS010 has 6 different functions.
*/
#define NUM_ERASEFUNCTIONS 5
#define NUM_ERASEFUNCTIONS 6
#define FEATURE_REGISTERMAP (1 << 0)
#define FEATURE_BYTEWRITES (1 << 1)
......@@ -82,6 +83,9 @@ enum chipbustype {
#define FEATURE_ADDR_2AA (1 << 2)
#define FEATURE_ADDR_AAA (2 << 2)
#define FEATURE_ADDR_SHIFTED (1 << 5)
#define FEATURE_WRSR_EWSR (1 << 6)
#define FEATURE_WRSR_WREN (1 << 7)
#define FEATURE_WRSR_EITHER (FEATURE_WRSR_EWSR | FEATURE_WRSR_WREN)
struct flashchip {
const char *vendor;
......
flashchips.c
View file @ fd7075ae
......@@ -789,6 +789,7 @@ struct flashchip flashchips[] = {
.model_id = AT_25DF021,
.total_size = 256,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_UNTESTED,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
......@@ -811,7 +812,8 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25df,
.unlock = spi_disable_blockprotect_at25df,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......@@ -824,6 +826,7 @@ struct flashchip flashchips[] = {
.model_id = AT_25DF041A,
.total_size = 512,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_UNTESTED,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
......@@ -846,7 +849,8 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25df,
.unlock = spi_disable_blockprotect_at25df,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......@@ -859,6 +863,7 @@ struct flashchip flashchips[] = {
.model_id = AT_25DF081,
.total_size = 1024,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_UNTESTED,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
......@@ -881,7 +886,45 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25df,
.unlock = spi_disable_blockprotect_at25df,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
{
.vendor = "Atmel",
.name = "AT25DF081A",
.bustype = CHIP_BUSTYPE_SPI,
.manufacture_id = ATMEL_ID,
.model_id = AT_25DF081A,
.total_size = 1024,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_UNTESTED,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
.block_erasers =
{
{
.eraseblocks = { {4 * 1024, 256} },
.block_erase = spi_block_erase_20,
}, {
.eraseblocks = { {32 * 1024, 32} },
.block_erase = spi_block_erase_52,
}, {
.eraseblocks = { {64 * 1024, 16} },
.block_erase = spi_block_erase_d8,
}, {
.eraseblocks = { {1024 * 1024, 1} },
.block_erase = spi_block_erase_60,
}, {
.eraseblocks = { {1024 * 1024, 1} },
.block_erase = spi_block_erase_c7,
}
},
.printlock = spi_prettyprint_status_register_at25df_sec,
.unlock = spi_disable_blockprotect_at25df_sec,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......@@ -894,6 +937,7 @@ struct flashchip flashchips[] = {
.model_id = AT_25DF161,
.total_size = 2048,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_UNTESTED,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
......@@ -916,7 +960,8 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25df_sec,
.unlock = spi_disable_blockprotect_at25df_sec,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......@@ -929,6 +974,7 @@ struct flashchip flashchips[] = {
.model_id = AT_25DF321,
.total_size = 4096,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_OK_PRW,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
......@@ -951,7 +997,8 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25df,
.unlock = spi_disable_blockprotect_at25df,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......@@ -964,6 +1011,7 @@ struct flashchip flashchips[] = {
.model_id = AT_25DF321A,
.total_size = 4096,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_UNTESTED,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
......@@ -986,7 +1034,8 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25df_sec,
.unlock = spi_disable_blockprotect_at25df_sec,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......@@ -999,6 +1048,7 @@ struct flashchip flashchips[] = {
.model_id = AT_25DF641,
.total_size = 8192,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_UNTESTED,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
......@@ -1021,7 +1071,45 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25df_sec,
.unlock = spi_disable_blockprotect_at25df_sec,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
{
.vendor = "Atmel",
.name = "AT25DQ161",
.bustype = CHIP_BUSTYPE_SPI,
.manufacture_id = ATMEL_ID,
.model_id = AT_25DQ161,
.total_size = 2048,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_UNTESTED,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
.block_erasers =
{
{
.eraseblocks = { {4 * 1024, 512} },
.block_erase = spi_block_erase_20,
}, {
.eraseblocks = { {32 * 1024, 64} },
.block_erase = spi_block_erase_52,
}, {
.eraseblocks = { {64 * 1024, 32} },
.block_erase = spi_block_erase_d8,
}, {
.eraseblocks = { {2 * 1024 * 1024, 1} },
.block_erase = spi_block_erase_60,
}, {
.eraseblocks = { {2 * 1024 * 1024, 1} },
.block_erase = spi_block_erase_c7,
}
},
.printlock = spi_prettyprint_status_register_at25df_sec,
.unlock = spi_disable_blockprotect_at25df_sec,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......@@ -1034,6 +1122,7 @@ struct flashchip flashchips[] = {
.model_id = AT_25F512B,
.total_size = 64,
.page_size = 256,
.feature_bits = FEATURE_WRSR_WREN,
.tested = TEST_UNTESTED,
.probe = probe_spi_rdid,
.probe_timing = TIMING_ZERO,
......@@ -1056,7 +1145,8 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25f,
.unlock = spi_disable_blockprotect_at25f,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......@@ -1077,6 +1167,9 @@ struct flashchip flashchips[] = {
{
.eraseblocks = { {4 * 1024, 32} },
.block_erase = spi_block_erase_20,
}, {
.eraseblocks = { {4 * 1024, 32} },
.block_erase = spi_block_erase_d7,
}, {
.eraseblocks = { {32 * 1024, 4} },
.block_erase = spi_block_erase_52,
......@@ -1091,7 +1184,8 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25fs010,
.unlock = spi_disable_blockprotect_at25fs010,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......@@ -1126,7 +1220,8 @@ struct flashchip flashchips[] = {
.block_erase = spi_block_erase_c7,
}
},
.unlock = spi_disable_blockprotect,
.printlock = spi_prettyprint_status_register_at25fs040,
.unlock = spi_disable_blockprotect_at25fs040,
.write = spi_chip_write_256,
.read = spi_chip_read,
},
......
flashchips.h
View file @ fd7075ae
......@@ -110,12 +110,19 @@
#define AT_25DF021 0x4300
#define AT_25DF041A 0x4401
#define AT_25DF081 0x4502
#define AT_25DF081A 0x4501 /* Yes, 81A has a lower number than 81 */
#define AT_25DF161 0x4602
#define AT_25DF321 0x4700 /* Same as 26DF321 */
#define AT_25DF321A 0x4701
#define AT_25DF641 0x4800
#define AT_25F512A 0x65 /* Needs special RDID. AT25F512A_RDID 15 1d */
#define AT_25DQ161 0x8600
#define AT25F512 /* No device ID found in datasheet. Vendor ID
* can be read with AT25F512A_RDID */
#define AT_25F512A 0x65 /* Needs AT25F512A_RDID */
#define AT_25F512B 0x6500
#define AT25F1024 /* No device ID found in datasheet. Vendor ID
* can be read with AT25F512A_RDID */
#define AT_25F1024A 0x60 /* Needs AT25F512A_RDID */
#define AT_25FS010 0x6601
#define AT_25FS040 0x6604
#define AT_26DF041 0x4400
......
spi.c
View file @ fd7075ae
......@@ -30,8 +30,6 @@
enum spi_controller spi_controller = SPI_CONTROLLER_NONE;
void spi_prettyprint_status_register(struct flashchip *flash);
const struct spi_programmer spi_programmer[] = {
{ /* SPI_CONTROLLER_NONE */
.command = NULL,
......
spi.h
View file @ fd7075ae
......@@ -31,7 +31,7 @@
#define JEDEC_RDID_INSIZE 0x03
/* AT25F512A has bit 3 as don't care bit in commands */
#define AT25F512A_RDID 0x15
#define AT25F512A_RDID 0x15 /* 0x15 or 0x1d */
#define AT25F512A_RDID_OUTSIZE 0x01
#define AT25F512A_RDID_INSIZE 0x02
......@@ -123,5 +123,6 @@
#define SPI_INVALID_OPCODE -2
#define SPI_INVALID_ADDRESS -3
#define SPI_INVALID_LENGTH -4
#define SPI_FLASHROM_BUG -5
#endif /* !__SPI_H__ */
spi25.c
View file @ fd7075ae
......@@ -312,7 +312,16 @@ uint8_t spi_read_status_register(void)
}
/* Prettyprint the status register. Common definitions. */
void spi_prettyprint_status_register_common(uint8_t status)
static void spi_prettyprint_status_register_welwip(uint8_t status)
{
msg_cdbg("Chip status register: Write Enable Latch (WEL) is "
"%sset\n", (status & (1 << 1)) ? "" : "not ");
msg_cdbg("Chip status register: Write In Progress (WIP/BUSY) is "
"%sset\n", (status & (1 << 0)) ? "" : "not ");
}
/* Prettyprint the status register. Common definitions. */
static void spi_prettyprint_status_register_common(uint8_t status)
{
msg_cdbg("Chip status register: Bit 5 / Block Protect 3 (BP3) is "
"%sset\n", (status & (1 << 5)) ? "" : "not ");
......@@ -322,10 +331,7 @@ void spi_prettyprint_status_register_common(uint8_t status)
"%sset\n", (status & (1 << 3)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 2 / Block Protect 0 (BP0) is "
"%sset\n", (status & (1 << 2)) ? "" : "not ");
msg_cdbg("Chip status register: Write Enable Latch (WEL) is "
"%sset\n", (status & (1 << 1)) ? "" : "not ");
msg_cdbg("Chip status register: Write In Progress (WIP/BUSY) is "
"%sset\n", (status & (1 << 0)) ? "" : "not ");
spi_prettyprint_status_register_welwip(status);
}
/* Prettyprint the status register. Works for
......@@ -338,6 +344,121 @@ void spi_prettyprint_status_register_amic_a25l(uint8_t status)
spi_prettyprint_status_register_common(status);
}
/* Prettyprint the status register. Common definitions. */
static void spi_prettyprint_status_register_at25_srplepewpp(uint8_t status)
{
msg_cdbg("Chip status register: Sector Protection Register Lock (SRPL) "
"is %sset\n", (status & (1 << 7)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 6 "
"is %sset\n", (status & (1 << 6)) ? "" : "not ");
msg_cdbg("Chip status register: Erase/Program Error (EPE) "
"is %sset\n", (status & (1 << 5)) ? "" : "not ");
msg_cdbg("Chip status register: WP# pin (WPP) "
"is %sactive\n", (status & (1 << 4)) ? "not " : "");
}
int spi_prettyprint_status_register_at25df(struct flashchip *flash)
{
uint8_t status;
status = spi_read_status_register();
msg_cdbg("Chip status register is %02x\n", status);
spi_prettyprint_status_register_at25_srplepewpp(status);
msg_cdbg("Chip status register: Software Protection Status (SWP): ");
switch (status & (3 << 2)) {
case 0x0 << 2:
msg_cdbg("no sectors are protected\n");
break;
case 0x1 << 2:
msg_cdbg("some sectors are protected\n");
/* FIXME: Read individual Sector Protection Registers. */
break;
case 0x3 << 2:
msg_cdbg("all sectors are protected\n");
break;
default:
msg_cdbg("reserved for future use\n");
break;
}
spi_prettyprint_status_register_welwip(status);
return 0;
}
int spi_prettyprint_status_register_at25df_sec(struct flashchip *flash)
{
/* FIXME: We should check the security lockdown. */
msg_cdbg("Ignoring security lockdown (if present)\n");
msg_cdbg("Ignoring status register byte 2\n");
return spi_prettyprint_status_register_at25df(flash);
}
int spi_prettyprint_status_register_at25f(struct flashchip *flash)
{
uint8_t status;
status = spi_read_status_register();
msg_cdbg("Chip status register is %02x\n", status);
spi_prettyprint_status_register_at25_srplepewpp(status);
msg_cdbg("Chip status register: Bit 3 "
"is %sset\n", (status & (1 << 3)) ? "" : "not ");
msg_cdbg("Chip status register: Block Protect 0 (BP0) is "
"%sset, %s sectors are protected\n",
(status & (1 << 2)) ? "" : "not ",
(status & (1 << 2)) ? "all" : "no");
spi_prettyprint_status_register_welwip(status);
return 0;
}
int spi_prettyprint_status_register_at25fs010(struct flashchip *flash)
{
uint8_t status;
status = spi_read_status_register();
msg_cdbg("Chip status register is %02x\n", status);
msg_cdbg("Chip status register: Status Register Write Protect (WPEN) "
"is %sset\n", (status & (1 << 7)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 6 / Block Protect 4 (BP4) is "
"%sset\n", (status & (1 << 6)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 5 / Block Protect 3 (BP3) is "
"%sset\n", (status & (1 << 5)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 4 is "
"%sset\n", (status & (1 << 4)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 3 / Block Protect 1 (BP1) is "
"%sset\n", (status & (1 << 3)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 2 / Block Protect 0 (BP0) is "
"%sset\n", (status & (1 << 2)) ? "" : "not ");
/* FIXME: Pretty-print detailed sector protection status. */
spi_prettyprint_status_register_welwip(status);
return 0;
}
int spi_prettyprint_status_register_at25fs040(struct flashchip *flash)
{
uint8_t status;
status = spi_read_status_register();
msg_cdbg("Chip status register is %02x\n", status);
msg_cdbg("Chip status register: Status Register Write Protect (WPEN) "
"is %sset\n", (status & (1 << 7)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 6 / Block Protect 4 (BP4) is "
"%sset\n", (status & (1 << 6)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 5 / Block Protect 3 (BP3) is "
"%sset\n", (status & (1 << 5)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 4 / Block Protect 2 (BP2) is "
"%sset\n", (status & (1 << 4)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 3 / Block Protect 1 (BP1) is "
"%sset\n", (status & (1 << 3)) ? "" : "not ");
msg_cdbg("Chip status register: Bit 2 / Block Protect 0 (BP0) is "
"%sset\n", (status & (1 << 2)) ? "" : "not ");
/* FIXME: Pretty-print detailed sector protection status. */
spi_prettyprint_status_register_welwip(status);
return 0;
}
/* Prettyprint the status register. Works for
* ST M25P series
* MX MX25L series
......@@ -732,12 +853,12 @@ int spi_write_status_enable(void)
* This is according the SST25VF016 datasheet, who knows it is more
* generic that this...
*/
int spi_write_status_register(int status)
static int spi_write_status_register_ewsr(struct flashchip *flash, int status)
{
int result;
struct spi_command cmds[] = {
{
/* FIXME: WRSR requires either EWSR or WREN depending on chip type. */
/* WRSR requires either EWSR or WREN depending on chip type. */
.writecnt = JEDEC_EWSR_OUTSIZE,
.writearr = (const unsigned char[]){ JEDEC_EWSR },
.readcnt = 0,
......@@ -759,9 +880,59 @@ int spi_write_status_register(int status)
msg_cerr("%s failed during command execution\n",
__func__);
}
/* WRSR performs a self-timed erase before the changes take effect. */
programmer_delay(100 * 1000);
return result;
}
static int spi_write_status_register_wren(struct flashchip *flash, int status)
{
int result;
struct spi_command cmds[] = {
{
/* WRSR requires either EWSR or WREN depending on chip type. */
.writecnt = JEDEC_WREN_OUTSIZE,
.writearr = (const unsigned char[]){ JEDEC_WREN },
.readcnt = 0,
.readarr = NULL,
}, {
.writecnt = JEDEC_WRSR_OUTSIZE,
.writearr = (const unsigned char[]){ JEDEC_WRSR, (unsigned char) status },
.readcnt = 0,
.readarr = NULL,
}, {
.writecnt = 0,
.writearr = NULL,
.readcnt = 0,
.readarr = NULL,
}};
result = spi_send_multicommand(cmds);
if (result) {
msg_cerr("%s failed during command execution\n",
__func__);
}
/* WRSR performs a self-timed erase before the changes take effect. */
programmer_delay(100 * 1000);
return result;
}
static int spi_write_status_register(struct flashchip *flash, int status)
{
int ret = 1;
if (!(flash->feature_bits & (FEATURE_WRSR_WREN | FEATURE_WRSR_EWSR))) {
msg_cdbg("Missing status register write definition, assuming "
"EWSR is needed\n");
flash->feature_bits |= FEATURE_WRSR_EWSR;
}
if (flash->feature_bits & FEATURE_WRSR_WREN)
ret = spi_write_status_register_wren(flash, status);
if (ret && (flash->feature_bits & FEATURE_WRSR_EWSR))
ret = spi_write_status_register_ewsr(flash, status);
return ret;
}
int spi_byte_program(int addr, uint8_t databyte)
{
int result;
......@@ -844,26 +1015,153 @@ int spi_nbyte_program(int addr, uint8_t *bytes, int len)
return result;
}
/* A generic brute-force block protection disable works like this:
* Write 0x00 to the status register. Check if any locks are still set (that
* part is chip specific). Repeat once.
*/
int spi_disable_blockprotect(struct flashchip *flash)
{
uint8_t status;
int result;
status = spi_read_status_register();
/* If there is block protection in effect, unprotect it first. */
/* If block protection is disabled, stop here. */
if ((status & 0x3c) == 0)
return 0;
msg_cdbg("Some block protection in effect, disabling\n");
result = spi_write_status_register(flash, status & ~0x3c);
if (result) {
msg_cerr("spi_write_status_register failed\n");
return result;
}
status = spi_read_status_register();
if ((status & 0x3c) != 0) {
msg_cdbg("Some block protection in effect, disabling\n");
result = spi_write_status_register(status & ~0x3c);
msg_cerr("Block protection could not be disabled!\n");
return 1;
}
return 0;
}
int spi_disable_blockprotect_at25df(struct flashchip *flash)
{
uint8_t status;
int result;
status = spi_read_status_register();
/* If block protection is disabled, stop here. */
if ((status & (3 << 2)) == 0)
return 0;
msg_cdbg("Some block protection in effect, disabling\n");
if (status & (1 << 7)) {
msg_cdbg("Need to disable Sector Protection Register Lock\n");
if ((status & (1 << 4)) == 0) {
msg_cerr("WP# pin is active, disabling "
"write protection is impossible.\n");
return 1;
}
/* All bits except bit 7 (SPRL) are readonly. */
result = spi_write_status_register(flash, status & ~(1 << 7));
if (result) {
msg_cerr("spi_write_status_register failed\n");
return result;
}
status = spi_read_status_register();
if ((status & 0x3c) != 0) {
msg_cerr("Block protection could not be disabled!\n");
return 1;
}
/* Global unprotect. Make sure to mask SPRL as well. */
result = spi_write_status_register(flash, status & ~0xbc);
if (result) {
msg_cerr("spi_write_status_register failed\n");
return result;
}
status = spi_read_status_register();
if ((status & (3 << 2)) != 0) {
msg_cerr("Block protection could not be disabled!\n");
return 1;
}
return 0;
}
int spi_disable_blockprotect_at25df_sec(struct flashchip *flash)
{
/* FIXME: We should check the security lockdown. */
msg_cinfo("Ignoring security lockdown (if present)\n");
return spi_disable_blockprotect_at25df(flash);
}
int spi_disable_blockprotect_at25f(struct flashchip *flash)
{
/* spi_disable_blockprotect_at25df is not really the right way to do
* this, but the side effects of said function work here as well.
*/
return spi_disable_blockprotect_at25df(flash);
}
int spi_disable_blockprotect_at25fs010(struct flashchip *flash)
{
uint8_t status;
int result;
status = spi_read_status_register();
/* If block protection is disabled, stop here. */
if ((status & 0x6c) == 0)
return 0;
msg_cdbg("Some block protection in effect, disabling\n");
if (status & (1 << 7)) {
msg_cdbg("Need to disable Status Register Write Protect\n");
/* Clear bit 7 (WPEN). */
result = spi_write_status_register(flash, status & ~(1 << 7));
if (result) {
msg_cerr("spi_write_status_register failed\n");
return result;
}
}
/* Global unprotect. Make sure to mask WPEN as well. */
result = spi_write_status_register(flash, status & ~0xec);
if (result) {
msg_cerr("spi_write_status_register failed\n");
return result;
}
status = spi_read_status_register();
if ((status & 0x6c) != 0) {
msg_cerr("Block protection could not be disabled!\n");
return 1;
}
return 0;
}
int spi_disable_blockprotect_at25fs040(struct flashchip *flash)
{
uint8_t status;
int result;
status = spi_read_status_register();
/* If block protection is disabled, stop here. */
if ((status & 0x7c) == 0)
return 0;
msg_cdbg("Some block protection in effect, disabling\n");
if (status & (1 << 7)) {
msg_cdbg("Need to disable Status Register Write Protect\n");
/* Clear bit 7 (WPEN). */
result = spi_write_status_register(flash, status & ~(1 << 7));
if (result) {
msg_cerr("spi_write_status_register failed\n");
return result;
}
}
/* Global unprotect. Make sure to mask WPEN as well. */
result = spi_write_status_register(flash, status & ~0xfc);
if (result) {
msg_cerr("spi_write_status_register failed\n");
return result;
}
status = spi_read_status_register();
if ((status & 0x7c) != 0) {
msg_cerr("Block protection could not be disabled!\n");
return 1;
}
return 0;
}
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment

Powered by Integricloud