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https://xff.cz/git/u-boot/
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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2018-2019, NVIDIA CORPORATION. All rights reserved.
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <log.h>
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#include <asm/global_data.h>
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#include <linux/arm-smccc.h>
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#include <asm/io.h>
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#include <asm/arch-tegra/pmc.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if IS_ENABLED(CONFIG_TEGRA_PMC_SECURE)
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static bool tegra_pmc_detect_tz_only(void)
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{
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static bool initialized = false;
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static bool is_tz_only = false;
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u32 value, saved;
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if (!initialized) {
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saved = readl(NV_PA_PMC_BASE + PMC_SCRATCH0);
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value = saved ^ 0xffffffff;
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if (value == 0xffffffff)
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value = 0xdeadbeef;
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/* write pattern and read it back */
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writel(value, NV_PA_PMC_BASE + PMC_SCRATCH0);
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value = readl(NV_PA_PMC_BASE + PMC_SCRATCH0);
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/* if we read all-zeroes, access is restricted to TZ only */
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if (value == 0) {
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debug("access to PMC is restricted to TZ\n");
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is_tz_only = true;
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} else {
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/* restore original value */
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writel(saved, NV_PA_PMC_BASE + PMC_SCRATCH0);
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}
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initialized = true;
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}
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return is_tz_only;
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}
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#endif
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uint32_t tegra_pmc_readl(unsigned long offset)
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{
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#if IS_ENABLED(CONFIG_TEGRA_PMC_SECURE)
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if (tegra_pmc_detect_tz_only()) {
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struct arm_smccc_res res;
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arm_smccc_smc(TEGRA_SMC_PMC, TEGRA_SMC_PMC_READ, offset, 0, 0,
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0, 0, 0, &res);
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if (res.a0)
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printf("%s(): SMC failed: %lu\n", __func__, res.a0);
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return res.a1;
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}
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#endif
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return readl(NV_PA_PMC_BASE + offset);
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}
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void tegra_pmc_writel(u32 value, unsigned long offset)
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{
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#if IS_ENABLED(CONFIG_TEGRA_PMC_SECURE)
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if (tegra_pmc_detect_tz_only()) {
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struct arm_smccc_res res;
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arm_smccc_smc(TEGRA_SMC_PMC, TEGRA_SMC_PMC_WRITE, offset,
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value, 0, 0, 0, 0, &res);
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if (res.a0)
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printf("%s(): SMC failed: %lu\n", __func__, res.a0);
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return;
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}
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#endif
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writel(value, NV_PA_PMC_BASE + offset);
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}
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