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https://github.com/ARM-software/arm-trusted-firmware.git
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45c70e6867
Changes stm32mp1 reset driver to API to add a timeout argument to stm32mp_reset_assert() and stm32mp_reset_deassert() and a return value. With a supplied timeout, the functions wait the target reset state is reached before returning. With a timeout of zero, the functions simply load target reset state in SoC interface and return without waiting. Helper functions stm32mp_reset_set() and stm32mp_reset_release() use a zero timeout and return without a return code. This change updates few stm32 drivers and plat/stm32mp1 blé_plat_setup.c accordingly without any functional change. functional change. Change-Id: Ia1a73a15125d3055fd8739c125b70bcb9562c27f Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
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* Copyright (c) 2018-2019, STMicroelectronics - All Rights Reserved
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <errno.h>
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#include <limits.h>
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#include <platform_def.h>
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#include <common/bl_common.h>
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#include <common/debug.h>
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#include <drivers/delay_timer.h>
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#include <drivers/st/stm32mp_reset.h>
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#include <lib/mmio.h>
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#include <lib/utils_def.h>
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static uint32_t id2reg_offset(unsigned int reset_id)
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{
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return ((reset_id & GENMASK(31, 5)) >> 5) * sizeof(uint32_t);
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}
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static uint8_t id2reg_bit_pos(unsigned int reset_id)
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{
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return (uint8_t)(reset_id & GENMASK(4, 0));
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}
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int stm32mp_reset_assert(uint32_t id, unsigned int to_us)
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{
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uint32_t offset = id2reg_offset(id);
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uint32_t bitmsk = BIT(id2reg_bit_pos(id));
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uintptr_t rcc_base = stm32mp_rcc_base();
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mmio_write_32(rcc_base + offset, bitmsk);
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if (to_us != 0U) {
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uint64_t timeout_ref = timeout_init_us(to_us);
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while ((mmio_read_32(rcc_base + offset) & bitmsk) == 0U) {
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if (timeout_elapsed(timeout_ref)) {
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return -ETIMEDOUT;
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}
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}
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}
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return 0;
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}
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int stm32mp_reset_deassert(uint32_t id, unsigned int to_us)
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{
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uint32_t offset = id2reg_offset(id) + RCC_RSTCLRR_OFFSET;
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uint32_t bitmsk = BIT(id2reg_bit_pos(id));
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uintptr_t rcc_base = stm32mp_rcc_base();
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mmio_write_32(rcc_base + offset, bitmsk);
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if (to_us != 0U) {
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uint64_t timeout_ref = timeout_init_us(to_us);
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while ((mmio_read_32(rcc_base + offset) & bitmsk) != 0U) {
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if (timeout_elapsed(timeout_ref)) {
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return -ETIMEDOUT;
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}
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}
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}
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return 0;
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}
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