645350ed4b
The Motorola Atrix 4G (MB860) and Droid X2 (MB870) both featured a dual-core NVIDIA Tegra 2 AP20H processor clocked at 1GHz, coupled with 1GB of DDR2 RAM. Storage consisted of 16GB of internal flash memory, expandable via microSD. The display was a 4.0-inch TFT LCD with a resolution of 960x540 pixels (qHD). The devices originally ran on Android up to 2.3 (Gingerbread). Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* T20 Motorola Atrix 4G and Droid X2 SPL stage configuration
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*
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* (C) Copyright 2025
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* Svyatoslav Ryhel <clamor95@gmail.com>
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*/
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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/pmc.h>
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#include <spl_gpio.h>
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#include <linux/delay.h>
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/*
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* Unlike all other supported Tegra devices and most known Tegra devices, the
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* both Atrix 4G and Droid X2 have no hardware way to enter APX/RCM mode, which
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* may lead to a dangerous situation when, if BCT is set correctly and the
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* bootloader is faulty, the device will hang in a permanent brick state.
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* Exiting from this state can be done only by disassembling the device and
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* shortening testpad 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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int value;
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/* Configure pinmux for PR0 */
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pinmux_set_func(PMUX_PINGRP_KBCA, PMUX_FUNC_KBC);
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pinmux_set_pullupdown(PMUX_PINGRP_KBCA, PMUX_PULL_UP);
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pinmux_tristate_disable(PMUX_PINGRP_KBCA);
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/* Configure pinmux for PQ0 */
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pinmux_set_func(PMUX_PINGRP_KBCC, PMUX_FUNC_KBC);
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pinmux_set_pullupdown(PMUX_PINGRP_KBCC, PMUX_PULL_UP);
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pinmux_tristate_disable(PMUX_PINGRP_KBCC);
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/* Hog column 0 (PQ0) low - active */
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spl_gpio_output(NULL, TEGRA_GPIO(Q, 0), 0);
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udelay(500);
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spl_gpio_input(NULL, TEGRA_GPIO(R, 0));
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value = spl_gpio_get_value(NULL, TEGRA_GPIO(R, 0));
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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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