1 /*
2  * MPC85xx PM operators
3  *
4  * Copyright 2015 Freescale Semiconductor Inc.
5  *
6  * This program is free software; you can redistribute  it and/or modify it
7  * under  the terms of  the GNU General  Public License as published by the
8  * Free Software Foundation;  either version 2 of the  License, or (at your
9  * option) any later version.
10  */
11 
12 #define pr_fmt(fmt) "%s: " fmt, __func__
13 
14 #include <linux/kernel.h>
15 #include <linux/of.h>
16 #include <linux/of_address.h>
17 #include <linux/fsl/guts.h>
18 
19 #include <asm/io.h>
20 #include <asm/fsl_pm.h>
21 
22 static struct ccsr_guts __iomem *guts;
23 
24 static void mpc85xx_irq_mask(int cpu)
25 {
26 
27 }
28 
29 static void mpc85xx_irq_unmask(int cpu)
30 {
31 
32 }
33 
34 static void mpc85xx_cpu_die(int cpu)
35 {
36 	u32 tmp;
37 
38 	tmp = (mfspr(SPRN_HID0) & ~(HID0_DOZE|HID0_SLEEP)) | HID0_NAP;
39 	mtspr(SPRN_HID0, tmp);
40 
41 	/* Enter NAP mode. */
42 	tmp = mfmsr();
43 	tmp |= MSR_WE;
44 	asm volatile(
45 		"msync\n"
46 		"mtmsr %0\n"
47 		"isync\n"
48 		:
49 		: "r" (tmp));
50 }
51 
52 static void mpc85xx_cpu_up_prepare(int cpu)
53 {
54 
55 }
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 	.irq_mask = mpc85xx_irq_mask,
84 	.irq_unmask = mpc85xx_irq_unmask,
85 	.cpu_die = mpc85xx_cpu_die,
86 	.cpu_up_prepare = mpc85xx_cpu_up_prepare,
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 	}
102 
103 	qoriq_pm_ops = &mpc85xx_pm_ops;
104 
105 	return 0;
106 }
107