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4BA: Allow disabling 4-byte address mode for SPI flash

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This allows us to support flash chips in any of the following
configurations, regardless of whether the chip powers up in 3-byte or
4-byte address mode.

- standard commands with extended address register (*_4ba_ereg) or
  direct commands (*_4ba_direct) in 3-byte address mode (.set_4ba =
  spi_exit_4ba_*)
- standard commands (*_4ba) or direct commands (*_4ba_direct) in
  4-byte address mode (.set_4ba = spi_enter_4ba_*)
- direct commands (*_4ba_direct) in either address mode (.set_4ba =
  NULL)

Change-Id: I0b25309d731426940fc50956b744b681ab599e87
Signed-off-by: Ed Swierk <eswierk@skyportsystems.com>
Reviewed-on: https://review.coreboot.org/20510
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Ed Swierk 2017-07-03 13:17:18 -07:00 committed by Nico Huber
parent d94d254262
commit cc20a9b08e
3 changed files with 10 additions and 46 deletions
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11
flash.h
View File

@ -119,14 +119,7 @@ enum write_granularity {
#define FEATURE_WRSR_EITHER (FEATURE_WRSR_EWSR | FEATURE_WRSR_WREN)
#define FEATURE_OTP (1 << 8)
#define FEATURE_QPI (1 << 9)
/* Feature bits used for 4-bytes addressing mode */
#define FEATURE_4BA_SUPPORT (1 << 10)
#define FEATURE_4BA_ONLY (1 << 11)
#define FEATURE_4BA_EXTENDED_ADDR_REG (1 << 12)
#define FEATURE_4BA_DIRECT_READ (1 << 13)
#define FEATURE_4BA_DIRECT_WRITE (1 << 14)
#define FEATURE_4BA_ALL_ERASERS_DIRECT (1 << 15)
#define FEATURE_4BA_ALL_DIRECT (FEATURE_4BA_DIRECT_READ | FEATURE_4BA_DIRECT_WRITE | FEATURE_4BA_ALL_ERASERS_DIRECT)
#define FEATURE_4BA_SUPPORT (1 << 10)
enum test_state {
OK = 0,
@ -174,7 +167,7 @@ struct flashchip {
/* set of function pointers to use in 4-bytes addressing mode */
struct four_bytes_addr_funcs_set {
int (*enter_4ba) (struct flashctx *flash);
int (*set_4ba) (struct flashctx *flash);
int (*read_nbyte) (struct flashctx *flash, unsigned int addr, uint8_t *bytes, unsigned int len);
int (*program_byte) (struct flashctx *flash, unsigned int addr, const uint8_t databyte);
int (*program_nbyte) (struct flashctx *flash, unsigned int addr, const uint8_t *bytes, unsigned int len);

4
flashchips.c
View File

@ -14597,10 +14597,10 @@ const struct flashchip flashchips[] = {
/* supports SFDP */
/* OTP: 1024B total, 256B reserved; read 0x48; write 0x42, erase 0x44, read ID 0x4B */
/* FOUR_BYTE_ADDR: supports 4-bytes addressing mode */
.feature_bits = FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA_SUPPORT | FEATURE_4BA_DIRECT_READ,
.feature_bits = FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA_SUPPORT,
.four_bytes_addr_funcs =
{
.enter_4ba = spi_enter_4ba_b7_we, /* enter 4-bytes addressing mode by CMD B7 + WREN */
.set_4ba = spi_enter_4ba_b7_we, /* enter 4-bytes addressing mode by CMD B7 + WREN */
.read_nbyte = spi_nbyte_read_4ba_direct, /* read directly from any mode, no need to enter 4ba */
.program_byte = spi_byte_program_4ba, /* write from 4-bytes addressing mode */
.program_nbyte = spi_nbyte_program_4ba /* write from 4-bytes addressing mode */

41
flashrom.c
View File

@ -2223,41 +2223,12 @@ int prepare_flash_access(struct flashctx *const flash,
if (flash->chip->unlock)
flash->chip->unlock(flash);
/* Switching to 4-Bytes Addressing mode if flash chip supports it */
if(flash->chip->feature_bits & FEATURE_4BA_SUPPORT) {
/* Do not switch if chip is already in 4-bytes addressing mode */
if (flash->chip->feature_bits & FEATURE_4BA_ONLY) {
msg_cdbg("Flash chip is already in 4-bytes addressing mode.\n");
}
/* Do not switch to 4-Bytes Addressing mode if using Extended Address Register */
else if(flash->chip->feature_bits & FEATURE_4BA_EXTENDED_ADDR_REG) {
msg_cdbg("Using 4-bytes addressing with extended address register.\n");
}
/* Go to 4-Bytes Addressing mode if selected
operation requires 4-Bytes Addressing mode
(no need if functions are direct-4BA) */
else if(((read_it || verify_it)
&& (!(flash->chip->feature_bits & FEATURE_4BA_DIRECT_READ)))
|| ((erase_it || write_it)
&& ((flash->chip->feature_bits & FEATURE_4BA_ALL_DIRECT) != FEATURE_4BA_ALL_DIRECT))) {
if (!flash->chip->four_bytes_addr_funcs.enter_4ba) {
msg_cerr("No function for Enter 4-bytes addressing mode for this flash chip.\n"
"Please report to flashrom@flashrom.org\n");
return 1;
}
if(flash->chip->four_bytes_addr_funcs.enter_4ba(flash)) {
msg_cerr("Switching to 4-bytes addressing mode failed!\n");
return 1;
}
msg_cdbg("Switched to 4-bytes addressing mode.\n");
}
/* Do not switch to 4-Bytes Addressing mode if all instructions are direct-4BA
or if the flash chip is 4-Bytes Addressing Only and always in 4BA-mode */
else {
msg_cdbg2("No need to switch to 4-bytes addressing mode.\n");
/* Enable/disable 4-byte addressing mode if flash chip supports it */
if ((flash->chip->feature_bits & FEATURE_4BA_SUPPORT) &&
flash->chip->four_bytes_addr_funcs.set_4ba) {
if (flash->chip->four_bytes_addr_funcs.set_4ba(flash)) {
msg_cerr("Enabling/disabling 4-byte addressing mode failed!\n");
return 1;
}
}