4BA: Add spi_exit_4ba function to switch SPI flash to 3-byte addressing
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>
diff --git a/spi4ba.c b/spi4ba.c
index 93f19c4..a44e067 100644
--- a/spi4ba.c
+++ b/spi4ba.c
@@ -78,6 +78,49 @@
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)
{