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
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