From 07c91d55db461b74320a2e04c035f2c5533a1622 Mon Sep 17 00:00:00 2001 From: Rex-BC Chen Date: Mon, 25 Jul 2022 19:52:14 +0800 Subject: mb/google/geralt: Implement SKU ID and RAM code - Retrieve the SKU ID for Geralt via CBI interface. If that failed (or no data found), fall back to ADC channels for SKU ID. - The RAM code is implemented by the resistor straps that we can read and decode from ADC. TEST=build pass BUG=b:236331724 Signed-off-by: Bo-Chen Chen Change-Id: I31626e44bd873a3866c9bd1d511b476737f15a20 Reviewed-on: https://review.coreboot.org/c/coreboot/+/66275 Reviewed-by: Yu-Ping Wu Tested-by: build bot (Jenkins) --- src/mainboard/google/geralt/Kconfig | 1 + src/mainboard/google/geralt/Makefile.inc | 1 + src/mainboard/google/geralt/boardid.c | 92 ++++++++++++++++++++++++++++++++ 3 files changed, 94 insertions(+) create mode 100644 src/mainboard/google/geralt/boardid.c diff --git a/src/mainboard/google/geralt/Kconfig b/src/mainboard/google/geralt/Kconfig index 9655bca1002c..11a2d7bc049f 100644 --- a/src/mainboard/google/geralt/Kconfig +++ b/src/mainboard/google/geralt/Kconfig @@ -23,6 +23,7 @@ config BOARD_SPECIFIC_OPTIONS select COMMONLIB_STORAGE_MMC select EC_GOOGLE_CHROMEEC select EC_GOOGLE_CHROMEEC_BOARDID + select EC_GOOGLE_CHROMEEC_SKUID select EC_GOOGLE_CHROMEEC_SPI select I2C_TPM if VBOOT select MAINBOARD_HAS_TPM2 if VBOOT diff --git a/src/mainboard/google/geralt/Makefile.inc b/src/mainboard/google/geralt/Makefile.inc index d1d9ff3b0e49..fc1a62648a17 100644 --- a/src/mainboard/google/geralt/Makefile.inc +++ b/src/mainboard/google/geralt/Makefile.inc @@ -11,6 +11,7 @@ romstage-y += chromeos.c romstage-y += romstage.c ramstage-y += memlayout.ld +ramstage-y += boardid.c ramstage-y += chromeos.c ramstage-y += mainboard.c ramstage-y += regulator.c diff --git a/src/mainboard/google/geralt/boardid.c b/src/mainboard/google/geralt/boardid.c new file mode 100644 index 000000000000..96031ef40839 --- /dev/null +++ b/src/mainboard/google/geralt/boardid.c @@ -0,0 +1,92 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include +#include +#include +#include +#include + +/* board_id is provided by ec/google/chromeec/ec_boardid.c */ + +#define ADC_LEVELS 12 + +enum { + /* RAM IDs */ + RAM_ID_LOW_CHANNEL = 2, + RAM_ID_HIGH_CHANNEL = 3, + /* SKU IDs */ + SKU_ID_LOW_CHANNEL = 4, + SKU_ID_HIGH_CHANNEL = 5, +}; + +static const unsigned int ram_voltages[ADC_LEVELS] = { + /* ID : Voltage (unit: uV) */ + [0] = 74300, + [1] = 211700, + [2] = 318800, + [3] = 428600, + [4] = 541700, + [5] = 665800, + [6] = 781400, + [7] = 900000, + [8] = 1023100, + [9] = 1137000, + [10] = 1240000, + [11] = 1342600, +}; + +static const unsigned int *adc_voltages[] = { + [RAM_ID_LOW_CHANNEL] = ram_voltages, + [RAM_ID_HIGH_CHANNEL] = ram_voltages, + [SKU_ID_LOW_CHANNEL] = ram_voltages, + [SKU_ID_HIGH_CHANNEL] = ram_voltages, +}; + +static uint32_t get_adc_index(unsigned int channel) +{ + unsigned int value = auxadc_get_voltage_uv(channel); + + assert(channel < ARRAY_SIZE(adc_voltages)); + const unsigned int *voltages = adc_voltages[channel]; + assert(voltages); + + /* Find the closest voltage */ + uint32_t id; + for (id = 0; id < ADC_LEVELS - 1; id++) + if (value < (voltages[id] + voltages[id + 1]) / 2) + break; + + printk(BIOS_DEBUG, "ADC[%u]: Raw value=%u ID=%u\n", channel, value, id); + return id; +} + +uint32_t sku_id(void) +{ + static uint32_t cached_sku_code = BOARD_ID_INIT; + + if (cached_sku_code == BOARD_ID_INIT) { + cached_sku_code = google_chromeec_get_board_sku(); + + if (cached_sku_code == CROS_SKU_UNKNOWN) { + printk(BIOS_WARNING, "Failed to get SKU code from EC\n"); + cached_sku_code = (get_adc_index(SKU_ID_HIGH_CHANNEL) << 4 | + get_adc_index(SKU_ID_LOW_CHANNEL)); + } + printk(BIOS_DEBUG, "SKU Code: %#02x\n", cached_sku_code); + } + + return cached_sku_code; +} + +uint32_t ram_code(void) +{ + static uint32_t cached_ram_code = BOARD_ID_INIT; + + if (cached_ram_code == BOARD_ID_INIT) { + cached_ram_code = (get_adc_index(RAM_ID_HIGH_CHANNEL) << 4 | + get_adc_index(RAM_ID_LOW_CHANNEL)); + printk(BIOS_DEBUG, "RAM Code: %#02x\n", cached_ram_code); + } + + return cached_ram_code; +} -- cgit v1.2.3