From 9a7d7bcea5c3a7bbf956c0909af121a870af515e Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Sat, 7 Sep 2013 00:41:48 -0500 Subject: baytrail: add initial support The initial Bay Trail code is intended to support the mobile and desktop version of Bay Trail. This support can train memory and execute through ramstage. However, the resource allocation is not curently handled correctly. The MRC cache parameters are successfully saved and reused after the initial cold boot. BUG=chrome-os-partner:22292 BRANCH=None TEST=Built and booted on a reference board through ramstage. Change-Id: I238ede326802aad272c6cca39d7ad4f161d813f5 Signed-off-by: Aaron Durbin Reviewed-on: https://chromium-review.googlesource.com/168387 Reviewed-by: Duncan Laurie Reviewed-on: http://review.coreboot.org/4847 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc --- src/soc/intel/baytrail/nvm.c | 83 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 src/soc/intel/baytrail/nvm.c (limited to 'src/soc/intel/baytrail/nvm.c') diff --git a/src/soc/intel/baytrail/nvm.c b/src/soc/intel/baytrail/nvm.c new file mode 100644 index 0000000000..dccc8014dc --- /dev/null +++ b/src/soc/intel/baytrail/nvm.c @@ -0,0 +1,83 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include +#include +#include +#include +#include + +/* This module assumes the flash is memory mapped just below 4GiB in the + * address space for reading. Also this module assumes an area it erased + * when all bytes read as all 0xff's. */ + +static struct spi_flash *flash; + +static int nvm_init(void) +{ + if (flash != NULL) + return 0; + + spi_init(); + flash = spi_flash_probe(0, 0, 1000000, SPI_MODE_3); + if (!flash) { + printk(BIOS_DEBUG, "Could not find SPI device\n"); + return -1; + } + + return 0; +} + +/* Convert memory mapped pointer to flash offset. */ +static inline uint32_t to_flash_offset(void *p) +{ + return CONFIG_ROM_SIZE + (uintptr_t)p; +} + +int nvm_is_erased(const void *start, size_t size) +{ + const char *cur = start; + + while (size > 0) { + if (*cur != 0xff) + return 0; + cur++; + size--; + } + return 1; +} + +int nvm_erase(void *start, size_t size) +{ + if (nvm_init() < 0) + return -1; + flash->erase(flash, to_flash_offset(start), size); + return 0; +} + +/* Write data to NVM. Returns 0 on success < 0 on error. */ +int nvm_write(void *start, const void *data, size_t size) +{ + if (nvm_init() < 0) + return -1; + flash->write(flash, to_flash_offset(start), size, data); + return 0; +} -- cgit v1.2.3