cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mach-imx7ulp.c (1819B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Copyright (C) 2016 Freescale Semiconductor, Inc.
      4 * Copyright 2017-2018 NXP
      5 *   Author: Dong Aisheng <aisheng.dong@nxp.com>
      6 */
      7
      8#include <linux/irqchip.h>
      9#include <linux/mfd/syscon.h>
     10#include <linux/of_platform.h>
     11#include <linux/regmap.h>
     12#include <asm/mach/arch.h>
     13
     14#include "common.h"
     15#include "cpuidle.h"
     16#include "hardware.h"
     17
     18#define SIM_JTAG_ID_REG		0x8c
     19
     20static void __init imx7ulp_set_revision(void)
     21{
     22	struct regmap *sim;
     23	u32 revision;
     24
     25	sim = syscon_regmap_lookup_by_compatible("fsl,imx7ulp-sim");
     26	if (IS_ERR(sim)) {
     27		pr_warn("failed to find fsl,imx7ulp-sim regmap!\n");
     28		return;
     29	}
     30
     31	if (regmap_read(sim, SIM_JTAG_ID_REG, &revision)) {
     32		pr_warn("failed to read sim regmap!\n");
     33		return;
     34	}
     35
     36	/*
     37	 * bit[31:28] of JTAG_ID register defines revision as below from B0:
     38	 * 0001        B0
     39	 * 0010        B1
     40	 * 0011        B2
     41	 */
     42	switch (revision >> 28) {
     43	case 1:
     44		imx_set_soc_revision(IMX_CHIP_REVISION_2_0);
     45		break;
     46	case 2:
     47		imx_set_soc_revision(IMX_CHIP_REVISION_2_1);
     48		break;
     49	case 3:
     50		imx_set_soc_revision(IMX_CHIP_REVISION_2_2);
     51		break;
     52	default:
     53		imx_set_soc_revision(IMX_CHIP_REVISION_1_0);
     54		break;
     55	}
     56}
     57
     58static void __init imx7ulp_init_machine(void)
     59{
     60	imx7ulp_pm_init();
     61
     62	mxc_set_cpu_type(MXC_CPU_IMX7ULP);
     63	imx7ulp_set_revision();
     64	of_platform_default_populate(NULL, NULL, NULL);
     65}
     66
     67static const char *const imx7ulp_dt_compat[] __initconst = {
     68	"fsl,imx7ulp",
     69	NULL,
     70};
     71
     72static void __init imx7ulp_init_late(void)
     73{
     74	if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
     75		platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
     76
     77	imx7ulp_cpuidle_init();
     78}
     79
     80DT_MACHINE_START(IMX7ulp, "Freescale i.MX7ULP (Device Tree)")
     81	.init_machine	= imx7ulp_init_machine,
     82	.dt_compat	= imx7ulp_dt_compat,
     83	.init_late	= imx7ulp_init_late,
     84MACHINE_END