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 */ 41 switch (revision >> 28) { 42 case 1: 43 imx_set_soc_revision(IMX_CHIP_REVISION_2_0); 44 break; 45 case 2: 46 imx_set_soc_revision(IMX_CHIP_REVISION_2_1); 47 break; 48 default: 49 imx_set_soc_revision(IMX_CHIP_REVISION_1_0); 50 break; 51 } 52 } 53 54 static void __init imx7ulp_init_machine(void) 55 { 56 imx7ulp_pm_init(); 57 58 mxc_set_cpu_type(MXC_CPU_IMX7ULP); 59 imx7ulp_set_revision(); 60 of_platform_default_populate(NULL, NULL, NULL); 61 } 62 63 static const char *const imx7ulp_dt_compat[] __initconst = { 64 "fsl,imx7ulp", 65 NULL, 66 }; 67 68 static void __init imx7ulp_init_late(void) 69 { 70 imx7ulp_cpuidle_init(); 71 } 72 73 DT_MACHINE_START(IMX7ulp, "Freescale i.MX7ULP (Device Tree)") 74 .init_machine = imx7ulp_init_machine, 75 .dt_compat = imx7ulp_dt_compat, 76 .init_late = imx7ulp_init_late, 77 MACHINE_END 78