0d4f97e270
This patch moves ARM core and DRAM timing functions around to simplify
the dependencies for system_clock_init().
The original code was architected such that the system_clock_init()
function called other functions to obtain core and memory timings.
Due to the way memory timing information must be obtained on Snow,
which entails decoding platform-specific board straps, the bottom-
up approach resulted in having the low-level clock init code
implicitly depend on board and vendor-specific info:
main()
->system_clock_init()
-> get_arm_ratios()
-> CPU-specific code
-> clock_get_mem_timings()
-> board_get_revision()
-> read GPIOs (3-state logic)
-> Decode GPIOs in a vendor-specific manner
-> Choose memory timings from module-specific look-up table
...then proceed to init clocks
...come back to main()
The new approach gathers all board and vendor-specific info in a
more appropriate location and passes it into system_clock_init():
main()
-> get_arm_ratios()
-> CPU-specific code
-> get_mem_timings()
-> board_get_config()
-> read GPIOs (3-state logic)
-> Decode GPIOs in a vendor-specific manner
-> Choose memory timings from module-specific look-up table
-> system_clock_init()
...back to main()
Change-Id: Ie237ebff76fc2d8a4d2f4577a226ac3909e4d4e8
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2271
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/*
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* Copyright (C) 2012 Google Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 of
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* the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <stdlib.h>
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#include <gpio.h>
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#include <device/device.h>
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#include <console/console.h>
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#include <cpu/samsung/exynos5-common/gpio.h>
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#include <cpu/samsung/exynos5250/gpio.h>
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#include "mainboard.h"
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#define SNOW_BOARD_ID0_GPIO 88 /* GPD0, pin 0 */
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#define SNOW_BOARD_ID1_GPIO 89 /* GPD0, pin 1 */
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struct {
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enum mvl3 id0, id1;
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enum snow_board_config config;
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} snow_id_map[] = {
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/* ID0 ID1 config */
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{ LOGIC_0, LOGIC_0, SNOW_CONFIG_SAMSUNG_MP },
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{ LOGIC_0, LOGIC_1, SNOW_CONFIG_ELPIDA_MP },
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{ LOGIC_1, LOGIC_0, SNOW_CONFIG_SAMSUNG_DVT },
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{ LOGIC_1, LOGIC_1, SNOW_CONFIG_ELPIDA_DVT },
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{ LOGIC_0, LOGIC_Z, SNOW_CONFIG_SAMSUNG_PVT },
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{ LOGIC_1, LOGIC_Z, SNOW_CONFIG_ELPIDA_PVT },
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{ LOGIC_Z, LOGIC_0, SNOW_CONFIG_SAMSUNG_MP },
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{ LOGIC_Z, LOGIC_Z, SNOW_CONFIG_ELPIDA_MP },
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{ LOGIC_Z, LOGIC_1, SNOW_CONFIG_RSVD },
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};
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int board_get_config(void)
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{
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int i;
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int id0, id1;
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enum snow_board_config config = SNOW_CONFIG_UNKNOWN;
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id0 = gpio_read_mvl3(SNOW_BOARD_ID0_GPIO);
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id1 = gpio_read_mvl3(SNOW_BOARD_ID1_GPIO);
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if (id0 < 0 || id1 < 0)
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return -1;
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printk(BIOS_DEBUG, "%s: id0: %u, id1: %u\n", __func__, id0, id1);
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for (i = 0; i < ARRAY_SIZE(snow_id_map); i++) {
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if (id0 == snow_id_map[i].id0 && id1 == snow_id_map[i].id1) {
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config = snow_id_map[i].config;
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break;
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}
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}
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return config;
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}
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#if 0
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struct chip_operations mainboard_ops = {
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.name = "Samsung/Google ARM ChromeBook",
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.enable_dev = mainboard_enable,
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};
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#endif
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