59a407349b
Kukui is using MIPI display panel and needs some identifier to tell payloads which LCD module is installed, and to select right kernel device tree. Following Scarlet, the decision is to embed LCD module ID as part of SKU ID. The LCM ID is using a different voltage mapping table from the rest. Considering the complexity in computation of SKU ID, it is better to move the cache logic from get_index to caller. Also revise the mapping table since ADC on 8183 only supports 12 levels. BUG=b:129299873 TEST=make -j; boots on Kukui Rev2 unit. Change-Id: Ib0c00bc8ce3c71c445c5c4561403ce8ef4dd5844 Signed-off-by: Hung-Te Lin <hungte@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/32263 Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2018 MediaTek Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of 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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#include <assert.h>
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#include <boardid.h>
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#include <soc/auxadc.h>
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#include <ec/google/chromeec/ec.h>
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#include <stddef.h>
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/* For CBI un-provisioned/corrupted Flapjack board. */
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#define FLAPJACK_UNDEF_SKU_ID 0
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#define ADC_LEVELS 12
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enum {
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LCM_ID_CHANNEL = 2, /* ID of LCD Module on schematics. */
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RAM_ID_CHANNEL = 3,
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SKU_ID_CHANNEL = 4,
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};
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static const int ram_voltages[ADC_LEVELS] = {
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/* ID : Voltage (unit: uV) */
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/* 0 : */ 74000,
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/* 1 : */ 212000,
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/* 2 : */ 319000,
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/* 3 : */ 429000,
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/* 4 : */ 542000,
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/* 5 : */ 666000,
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/* 6 : */ 781000,
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/* 7 : */ 900000,
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/* 8 : */ 1023000,
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/* 9 : */ 1137000,
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/* 10 : */ 1240000,
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/* 11 : */ 1343000,
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};
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static const int lcm_voltages[ADC_LEVELS] = {
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/* ID : Voltage (unit: uV) */
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/* 0 : */ 0,
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/* 1 : */ 283000,
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/* 2 : */ 440000,
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/* 3 : */ 503000,
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/* 4 : */ 608000,
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/* 5 : */ 703000,
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/* 6 : */ 830000,
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/* 7 : */ 865000,
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/* 8 : */ 953000,
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/* 9 : */ 1079000,
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/* 10 : */ 1128000,
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/* 11 : */ 1434000,
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};
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static const int *adc_voltages[] = {
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[LCM_ID_CHANNEL] = lcm_voltages,
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[RAM_ID_CHANNEL] = ram_voltages,
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[SKU_ID_CHANNEL] = ram_voltages, /* SKU ID is sharing RAM voltages. */
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};
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static uint32_t get_adc_index(unsigned int channel)
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{
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int value = auxadc_get_voltage(channel);
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assert(channel < ARRAY_SIZE(adc_voltages));
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const int *voltages = adc_voltages[channel];
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assert(voltages);
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/* Find the closest voltage */
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uint32_t id;
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for (id = 0; id < ADC_LEVELS - 1; id++)
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if (value < (voltages[id] + voltages[id + 1]) / 2)
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break;
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const int tolerance = 10000; /* 10,000 uV */
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assert(ABS(value - voltages[id]) < tolerance);
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return id;
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}
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/* board_id is provided by ec/google/chromeec/ec_boardid.c */
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uint32_t sku_id(void)
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{
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static uint32_t cached_sku_id = BOARD_ID_INIT;
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if (cached_sku_id != BOARD_ID_INIT)
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return cached_sku_id;
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/* On Flapjack, getting the SKU via CBI. */
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if (CONFIG(BOARD_GOOGLE_FLAPJACK)) {
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if (google_chromeec_cbi_get_sku_id(&cached_sku_id))
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cached_sku_id = FLAPJACK_UNDEF_SKU_ID;
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return cached_sku_id;
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}
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/* Quirk for Kukui: All Rev1/Sku0 had incorrectly set SKU_ID=1. */
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if (CONFIG(BOARD_GOOGLE_KUKUI)) {
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if (board_id() == 1) {
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cached_sku_id = 0;
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return cached_sku_id;
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}
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}
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/*
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* The SKU (later used for device tree matching) is combined from:
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* ADC2[4bit/H] = straps on LCD module (type of panel).
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* ADC4[4bit/L] = SKU ID from board straps.
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*/
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cached_sku_id = (get_adc_index(LCM_ID_CHANNEL) << 4 |
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get_adc_index(SKU_ID_CHANNEL));
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return cached_sku_id;
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}
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uint32_t ram_code(void)
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{
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static uint32_t cached_ram_code = BOARD_ID_INIT;
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if (cached_ram_code == BOARD_ID_INIT)
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cached_ram_code = get_adc_index(RAM_ID_CHANNEL);
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return cached_ram_code;
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}
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