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
mpc85xx_irq_mask(int cpu)21 static void mpc85xx_irq_mask(int cpu)
22 {
23
24 }
25
mpc85xx_irq_unmask(int cpu)26 static void mpc85xx_irq_unmask(int cpu)
27 {
28
29 }
30
mpc85xx_cpu_die(int cpu)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
mpc85xx_cpu_up_prepare(int cpu)49 static void mpc85xx_cpu_up_prepare(int cpu)
50 {
51
52 }
53 #endif
54
mpc85xx_freeze_time_base(bool freeze)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
mpc85xx_setup_pmc(void)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