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4BA: Add spi_exit_4ba function to switch SPI flash to 3-byte addressing

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Change-Id: I553e7fb5028f35e14a3a81b3fa8903c1b321a223
Signed-off-by: Ed Swierk <eswierk@skyportsystems.com>
Reviewed-on: https://review.coreboot.org/20509
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 13:02:18 -07:00
committed by Nico Huber
parent 7fe85694c4
commit d94d254262
3 changed files with 49 additions and 0 deletions
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43
spi4ba.c
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@ -78,6 +78,49 @@ int spi_enter_4ba_b7_we(struct flashctx *flash)
return result;
}
/* Exit 4-bytes addressing mode (without sending WREN before) */
int spi_exit_4ba_e9(struct flashctx *flash)
{
const unsigned char cmd[JEDEC_EXIT_4_BYTE_ADDR_MODE_OUTSIZE] = { JEDEC_EXIT_4_BYTE_ADDR_MODE };
msg_trace("-> %s\n", __func__);
/* Switch to 3-bytes addressing mode */
return spi_send_command(flash, sizeof(cmd), 0, cmd, NULL);
}
/* Exit 4-bytes addressing mode with sending WREN before */
int spi_exit_4ba_e9_we(struct flashctx *flash)
{
int result;
struct spi_command cmds[] = {
{
.writecnt = JEDEC_WREN_OUTSIZE,
.writearr = (const unsigned char[]){ JEDEC_WREN },
.readcnt = 0,
.readarr = NULL,
}, {
.writecnt = JEDEC_EXIT_4_BYTE_ADDR_MODE_OUTSIZE,
.writearr = (const unsigned char[]){ JEDEC_EXIT_4_BYTE_ADDR_MODE },
.readcnt = 0,
.readarr = NULL,
}, {
.writecnt = 0,
.writearr = NULL,
.readcnt = 0,
.readarr = NULL,
}};
msg_trace("-> %s\n", __func__);
/* Switch to 3-bytes addressing mode */
result = spi_send_multicommand(flash, cmds);
if (result) {
msg_cerr("%s failed during command execution\n", __func__);
}
return result;
}
/* Program one flash byte from 4-bytes addressing mode */
int spi_byte_program_4ba(struct flashctx *flash, unsigned int addr, uint8_t databyte)
{