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 static void mpc85xx_irq_mask(int cpu)
21 {
22 
23 }
24 
25 static void mpc85xx_irq_unmask(int cpu)
26 {
27 
28 }
29 
30 static void mpc85xx_cpu_die(int cpu)
31 {
32 	u32 tmp;
33 
34 	tmp = (mfspr(SPRN_HID0) & ~(HID0_DOZE|HID0_SLEEP)) | HID0_NAP;
35 	mtspr(SPRN_HID0, tmp);
36 
37 	/* Enter NAP mode. */
38 	tmp = mfmsr();
39 	tmp |= MSR_WE;
40 	asm volatile(
41 		"msync\n"
42 		"mtmsr %0\n"
43 		"isync\n"
44 		:
45 		: "r" (tmp));
46 }
47 
48 static void mpc85xx_cpu_up_prepare(int cpu)
49 {
50 
51 }
52 
53 static void mpc85xx_freeze_time_base(bool freeze)
54 {
55 	uint32_t mask;
56 
57 	mask = CCSR_GUTS_DEVDISR_TB0 | CCSR_GUTS_DEVDISR_TB1;
58 	if (freeze)
59 		setbits32(&guts->devdisr, mask);
60 	else
61 		clrbits32(&guts->devdisr, mask);
62 
63 	in_be32(&guts->devdisr);
64 }
65 
66 static const struct of_device_id mpc85xx_smp_guts_ids[] = {
67 	{ .compatible = "fsl,mpc8572-guts", },
68 	{ .compatible = "fsl,p1020-guts", },
69 	{ .compatible = "fsl,p1021-guts", },
70 	{ .compatible = "fsl,p1022-guts", },
71 	{ .compatible = "fsl,p1023-guts", },
72 	{ .compatible = "fsl,p2020-guts", },
73 	{ .compatible = "fsl,bsc9132-guts", },
74 	{},
75 };
76 
77 static const struct fsl_pm_ops mpc85xx_pm_ops = {
78 	.freeze_time_base = mpc85xx_freeze_time_base,
79 	.irq_mask = mpc85xx_irq_mask,
80 	.irq_unmask = mpc85xx_irq_unmask,
81 	.cpu_die = mpc85xx_cpu_die,
82 	.cpu_up_prepare = mpc85xx_cpu_up_prepare,
83 };
84 
85 int __init mpc85xx_setup_pmc(void)
86 {
87 	struct device_node *np;
88 
89 	np = of_find_matching_node(NULL, mpc85xx_smp_guts_ids);
90 	if (np) {
91 		guts = of_iomap(np, 0);
92 		of_node_put(np);
93 		if (!guts) {
94 			pr_err("Could not map guts node address\n");
95 			return -ENOMEM;
96 		}
97 	}
98 
99 	qoriq_pm_ops = &mpc85xx_pm_ops;
100 
101 	return 0;
102 }
103