arch/arm/mach-imx/mach-imx7ulp.c

   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
  20 static 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
  58 static 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
  67 static const char *const imx7ulp_dt_compat[] __initconst = {
  68         "fsl,imx7ulp",
  69         NULL,
  70 };
  71
  72 static 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
  80 DT_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,
  84 MACHINE_END