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 #include "smp.h"
19 
20 static struct ccsr_guts __iomem *guts;
21 
22 #ifdef CONFIG_FSL_PMC
23 static void mpc85xx_irq_mask(int cpu)
24 {
25 
26 }
27 
28 static void mpc85xx_irq_unmask(int cpu)
29 {
30 
31 }
32 
33 static void mpc85xx_cpu_die(int cpu)
34 {
35 	u32 tmp;
36 
37 	tmp = (mfspr(SPRN_HID0) & ~(HID0_DOZE|HID0_SLEEP)) | HID0_NAP;
38 	mtspr(SPRN_HID0, tmp);
39 
40 	/* Enter NAP mode. */
41 	tmp = mfmsr();
42 	tmp |= MSR_WE;
43 	asm volatile(
44 		"msync\n"
45 		"mtmsr %0\n"
46 		"isync\n"
47 		:
48 		: "r" (tmp));
49 }
50 
51 static void mpc85xx_cpu_up_prepare(int cpu)
52 {
53 
54 }
55 #endif
56 
57 static void mpc85xx_freeze_time_base(bool freeze)
58 {
59 	uint32_t mask;
60 
61 	mask = CCSR_GUTS_DEVDISR_TB0 | CCSR_GUTS_DEVDISR_TB1;
62 	if (freeze)
63 		setbits32(&guts->devdisr, mask);
64 	else
65 		clrbits32(&guts->devdisr, mask);
66 
67 	in_be32(&guts->devdisr);
68 }
69 
70 static const struct of_device_id mpc85xx_smp_guts_ids[] = {
71 	{ .compatible = "fsl,mpc8572-guts", },
72 	{ .compatible = "fsl,p1020-guts", },
73 	{ .compatible = "fsl,p1021-guts", },
74 	{ .compatible = "fsl,p1022-guts", },
75 	{ .compatible = "fsl,p1023-guts", },
76 	{ .compatible = "fsl,p2020-guts", },
77 	{ .compatible = "fsl,bsc9132-guts", },
78 	{},
79 };
80 
81 static const struct fsl_pm_ops mpc85xx_pm_ops = {
82 	.freeze_time_base = mpc85xx_freeze_time_base,
83 #ifdef CONFIG_FSL_PMC
84 	.irq_mask = mpc85xx_irq_mask,
85 	.irq_unmask = mpc85xx_irq_unmask,
86 	.cpu_die = mpc85xx_cpu_die,
87 	.cpu_up_prepare = mpc85xx_cpu_up_prepare,
88 #endif
89 };
90 
91 int __init mpc85xx_setup_pmc(void)
92 {
93 	struct device_node *np;
94 
95 	np = of_find_matching_node(NULL, mpc85xx_smp_guts_ids);
96 	if (np) {
97 		guts = of_iomap(np, 0);
98 		of_node_put(np);
99 		if (!guts) {
100 			pr_err("Could not map guts node address\n");
101 			return -ENOMEM;
102 		}
103 		qoriq_pm_ops = &mpc85xx_pm_ops;
104 	}
105 
106 	return 0;
107 }
108