xref: /linux/arch/arm/mach-imx/mach-imx7ulp.c (revision cdd38c5f1ce4398ec58fec95904b75824daab7b5)
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 
imx7ulp_set_revision(void)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 
imx7ulp_init_machine(void)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 
imx7ulp_init_late(void)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
85