1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * MPC85xx PM operators
4  *
5  * Copyright 2015 Freescale Semiconductor Inc.
6  */
7 
8 #define pr_fmt(fmt) "%s: " fmt, __func__
9 
10 #include <linux/kernel.h>
11 #include <linux/of.h>
12 #include <linux/of_address.h>
13 #include <linux/fsl/guts.h>
14 
15 #include <asm/io.h>
16 #include <asm/fsl_pm.h>
17 
18 static struct ccsr_guts __iomem *guts;
19 
20 #ifdef CONFIG_FSL_PMC
21 static void mpc85xx_irq_mask(int cpu)
22 {
23 
24 }
25 
26 static void mpc85xx_irq_unmask(int cpu)
27 {
28 
29 }
30 
31 static void mpc85xx_cpu_die(int cpu)
32 {
33 	u32 tmp;
34 
35 	tmp = (mfspr(SPRN_HID0) & ~(HID0_DOZE|HID0_SLEEP)) | HID0_NAP;
36 	mtspr(SPRN_HID0, tmp);
37 
38 	/* Enter NAP mode. */
39 	tmp = mfmsr();
40 	tmp |= MSR_WE;
41 	asm volatile(
42 		"msync\n"
43 		"mtmsr %0\n"
44 		"isync\n"
45 		:
46 		: "r" (tmp));
47 }
48 
49 static void mpc85xx_cpu_up_prepare(int cpu)
50 {
51 
52 }
53 #endif
54 
55 static void mpc85xx_freeze_time_base(bool freeze)
56 {
57 	uint32_t mask;
58 
59 	mask = CCSR_GUTS_DEVDISR_TB0 | CCSR_GUTS_DEVDISR_TB1;
60 	if (freeze)
61 		setbits32(&guts->devdisr, mask);
62 	else
63 		clrbits32(&guts->devdisr, mask);
64 
65 	in_be32(&guts->devdisr);
66 }
67 
68 static const struct of_device_id mpc85xx_smp_guts_ids[] = {
69 	{ .compatible = "fsl,mpc8572-guts", },
70 	{ .compatible = "fsl,p1020-guts", },
71 	{ .compatible = "fsl,p1021-guts", },
72 	{ .compatible = "fsl,p1022-guts", },
73 	{ .compatible = "fsl,p1023-guts", },
74 	{ .compatible = "fsl,p2020-guts", },
75 	{ .compatible = "fsl,bsc9132-guts", },
76 	{},
77 };
78 
79 static const struct fsl_pm_ops mpc85xx_pm_ops = {
80 	.freeze_time_base = mpc85xx_freeze_time_base,
81 #ifdef CONFIG_FSL_PMC
82 	.irq_mask = mpc85xx_irq_mask,
83 	.irq_unmask = mpc85xx_irq_unmask,
84 	.cpu_die = mpc85xx_cpu_die,
85 	.cpu_up_prepare = mpc85xx_cpu_up_prepare,
86 #endif
87 };
88 
89 int __init mpc85xx_setup_pmc(void)
90 {
91 	struct device_node *np;
92 
93 	np = of_find_matching_node(NULL, mpc85xx_smp_guts_ids);
94 	if (np) {
95 		guts = of_iomap(np, 0);
96 		of_node_put(np);
97 		if (!guts) {
98 			pr_err("Could not map guts node address\n");
99 			return -ENOMEM;
100 		}
101 		qoriq_pm_ops = &mpc85xx_pm_ops;
102 	}
103 
104 	return 0;
105 }
106