From cc20a9b08e849437a58402f4a64d63d3710684af Mon Sep 17 00:00:00 2001 From: Ed Swierk Date: Mon, 3 Jul 2017 13:17:18 -0700 Subject: 4BA: Allow disabling 4-byte address mode for SPI flash 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 Reviewed-on: https://review.coreboot.org/20510 Reviewed-by: David Hendricks Tested-by: build bot (Jenkins) --- flashrom.c | 41 ++++++----------------------------------- 1 file changed, 6 insertions(+), 35 deletions(-) (limited to 'flashrom.c') diff --git a/flashrom.c b/flashrom.c index 8569a4960..4f17382dc 100644 --- a/flashrom.c +++ b/flashrom.c @@ -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; } } -- cgit v1.2.3