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86e581a560
Unlike all other supported Tegra devices and most known Tegra devices, the HTC One X has no hardware way to enter APX/RCM mode, which may lead to a dangerous situation when, if BCT is set correctly and the bootloader is faulty, the device will hang in a permanent brick state. Exiting from this state can be done only by disassembling the device and shortening the testpad to the ground. To prevent this or to minimize the probability of such an accident, it was proposed to add the RCM rebooting hook as early into SPL as possible since SPL is much more robust and has minimal changes that can break bootflow. gpio_early_init_uart() function was chosen as it is the earliest function exposed for setup by the device. Hook performs a check for volume up button state and triggers RCM if it is pressed. Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
103 lines
3.6 KiB
C
103 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* T30 HTC Endeavoru SPL stage configuration
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*
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* (C) Copyright 2010-2013
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* NVIDIA Corporation <www.nvidia.com>
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*
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* (C) Copyright 2022
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* Svyatoslav Ryhel <clamor95@gmail.com>
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*/
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#include <asm/io.h>
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#include <asm/gpio.h>
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#include <asm/arch/pinmux.h>
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#include <asm/arch/tegra.h>
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#include <asm/arch-tegra/board.h>
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#include <asm/arch-tegra/pmc.h>
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#include <asm/arch-tegra/tegra_i2c.h>
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#include <linux/delay.h>
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/*
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* Endeavoru uses TPS80032 PMIC with SMPS1 and SMPS2 in strandard
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* mode with zero offset.
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*/
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#define TPS80032_DVS_I2C_ADDR (0x12 << 1)
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#define TPS80032_SMPS1_CFG_VOLTAGE_REG 0x56
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#define TPS80032_SMPS2_CFG_VOLTAGE_REG 0x5C
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#define TPS80032_SMPS1_CFG_VOLTAGE_DATA (0x2100 | TPS80032_SMPS1_CFG_VOLTAGE_REG)
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#define TPS80032_SMPS2_CFG_VOLTAGE_DATA (0x3000 | TPS80032_SMPS2_CFG_VOLTAGE_REG)
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#define TPS80032_CTL1_I2C_ADDR (0x48 << 1)
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#define TPS80032_SMPS1_CFG_STATE_REG 0x54
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#define TPS80032_SMPS2_CFG_STATE_REG 0x5A
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#define TPS80032_SMPS1_CFG_STATE_DATA (0x0100 | TPS80032_SMPS1_CFG_STATE_REG)
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#define TPS80032_SMPS2_CFG_STATE_DATA (0x0100 | TPS80032_SMPS2_CFG_STATE_REG)
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#define TEGRA_GPIO_PS0 144
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void pmic_enable_cpu_vdd(void)
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{
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/* Set VDD_CORE to 1.200V. */
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tegra_i2c_ll_write(TPS80032_DVS_I2C_ADDR, TPS80032_SMPS2_CFG_VOLTAGE_DATA);
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udelay(1000);
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tegra_i2c_ll_write(TPS80032_CTL1_I2C_ADDR, TPS80032_SMPS2_CFG_STATE_DATA);
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udelay(1000);
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/* Bring up VDD_CPU to 1.0125V. */
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tegra_i2c_ll_write(TPS80032_DVS_I2C_ADDR, TPS80032_SMPS1_CFG_VOLTAGE_DATA);
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udelay(1000);
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tegra_i2c_ll_write(TPS80032_CTL1_I2C_ADDR, TPS80032_SMPS1_CFG_STATE_DATA);
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udelay(10 * 1000);
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}
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/*
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* Unlike all other supported Tegra devices and most known Tegra devices, the
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* HTC One X has no hardware way to enter APX/RCM mode, which may lead to a
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* dangerous situation when, if BCT is set correctly and the bootloader is
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* faulty, the device will hang in a permanent brick state. Exiting from this
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* state can be done only by disassembling the device and shortening testpad
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* to the ground.
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*
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* To prevent this or to minimize the probability of such an accident, it was
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* proposed to add the RCM rebooting hook as early into SPL as possible since
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* SPL is much more robust and has minimal changes that can break bootflow.
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*
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* gpio_early_init_uart() function was chosen as it is the earliest function
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* exposed for setup by the device. Hook performs a check for volume up
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* button state and triggers RCM if it is pressed.
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*/
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void gpio_early_init_uart(void)
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{
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struct gpio_ctlr *ctlr = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
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struct gpio_ctlr_bank *bank = &ctlr->gpio_bank[GPIO_BANK(TEGRA_GPIO_PS0)];
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u32 value;
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/* Configure pinmux */
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pinmux_set_func(PMUX_PINGRP_KB_ROW8_PS0, PMUX_FUNC_KBC);
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pinmux_set_pullupdown(PMUX_PINGRP_KB_ROW8_PS0, PMUX_PULL_UP);
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pinmux_tristate_disable(PMUX_PINGRP_KB_ROW8_PS0);
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pinmux_set_io(PMUX_PINGRP_KB_ROW8_PS0, PMUX_PIN_INPUT);
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/* Configure GPIO direction as input. */
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value = readl(&bank->gpio_dir_out[GPIO_PORT(TEGRA_GPIO_PS0)]);
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value &= ~(1 << GPIO_BIT(TEGRA_GPIO_PS0));
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writel(value, &bank->gpio_dir_out[GPIO_PORT(TEGRA_GPIO_PS0)]);
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/* Enable the pin as a GPIO */
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value = readl(&bank->gpio_config[GPIO_PORT(TEGRA_GPIO_PS0)]);
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value |= 1 << GPIO_BIT(TEGRA_GPIO_PS0);
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writel(value, &bank->gpio_config[GPIO_PORT(TEGRA_GPIO_PS0)]);
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/* Get GPIO value */
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value = readl(&bank->gpio_in[GPIO_PORT(TEGRA_GPIO_PS0)]);
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value = (value >> GPIO_BIT(TEGRA_GPIO_PS0)) & 1;
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/* Enter RCM if button is pressed */
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if (!value) {
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tegra_pmc_writel(2, PMC_SCRATCH0);
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tegra_pmc_writel(PMC_CNTRL_MAIN_RST, PMC_CNTRL);
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}
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}
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