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https://github.com/ARM-software/arm-trusted-firmware.git
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21cfa4531a
On closed chips, it is not allowed to open debug. The BSEC debug register can not be rewritten. On open chips, the debug is already open, no need to rewrite this register. This part of code is just removed. An INFO message is displayed if debug is disabled. The freeze of the watchdog during debug is also removed. In case of debug, this must be managed by the software that enables the debugger. Change-Id: I19fbd3c487bb1018db30fd599cfa94fe5090899f Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/*
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* Copyright (c) 2016-2021, 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 <assert.h>
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#include <errno.h>
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#include <platform_def.h>
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#include <common/debug.h>
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#include <drivers/st/bsec.h>
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#include <drivers/st/stm32mp1_rcc.h>
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#include <lib/mmio.h>
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#include <lib/utils_def.h>
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#include <stm32mp1_dbgmcu.h>
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#define DBGMCU_IDC U(0x00)
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#define DBGMCU_IDC_DEV_ID_MASK GENMASK(11, 0)
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#define DBGMCU_IDC_REV_ID_MASK GENMASK(31, 16)
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#define DBGMCU_IDC_REV_ID_SHIFT 16
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static int stm32mp1_dbgmcu_init(void)
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{
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if ((bsec_read_debug_conf() & BSEC_DBGSWGEN) == 0U) {
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INFO("Software access to all debug components is disabled\n");
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return -1;
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}
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mmio_setbits_32(RCC_BASE + RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN);
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return 0;
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}
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/*
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* @brief Get silicon revision from DBGMCU registers.
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* @param chip_version: pointer to the read value.
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* @retval 0 on success, negative value on failure.
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*/
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int stm32mp1_dbgmcu_get_chip_version(uint32_t *chip_version)
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{
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assert(chip_version != NULL);
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if (stm32mp1_dbgmcu_init() != 0) {
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return -EPERM;
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}
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*chip_version = (mmio_read_32(DBGMCU_BASE + DBGMCU_IDC) &
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DBGMCU_IDC_REV_ID_MASK) >> DBGMCU_IDC_REV_ID_SHIFT;
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return 0;
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}
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/*
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* @brief Get device ID from DBGMCU registers.
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* @param chip_dev_id: pointer to the read value.
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* @retval 0 on success, negative value on failure.
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*/
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int stm32mp1_dbgmcu_get_chip_dev_id(uint32_t *chip_dev_id)
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{
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assert(chip_dev_id != NULL);
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if (stm32mp1_dbgmcu_init() != 0) {
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return -EPERM;
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}
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*chip_dev_id = mmio_read_32(DBGMCU_BASE + DBGMCU_IDC) &
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DBGMCU_IDC_DEV_ID_MASK;
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return 0;
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}
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