Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/mach-imx/mach-imx7ulp.c
26292 views
1
// SPDX-License-Identifier: GPL-2.0+

2
/*

3
 * Copyright (C) 2016 Freescale Semiconductor, Inc.

4
 * Copyright 2017-2018 NXP

5
 *   Author: Dong Aisheng <[email protected]>

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

85


86