1 // SPDX-License-Identifier: GPL-2.0 1
2 //
3 // Copyright (c) 2010-2014 Samsung Electronics
4 // http://www.samsung.com
5 //
6 // S5PV210 - Power Management support
7 //
8 // Based on arch/arm/mach-s3c2410/pm.c
9 // Copyright (c) 2006 Simtec Electronics
10 // Ben Dooks <ben@simtec.co.uk>
11
12 #include <linux/init.h>
13 #include <linux/suspend.h>
14 #include <linux/syscore_ops.h>
15 #include <linux/io.h>
16 #include <linux/soc/samsung/s3c-pm.h>
17
18 #include <asm/cacheflush.h>
19 #include <asm/suspend.h>
20
21 #include "common.h"
22 #include "regs-clock.h"
23
24 /* helper functions to save and restore regist
25 struct sleep_save {
26 void __iomem *reg;
27 unsigned long val;
28 };
29
30 #define SAVE_ITEM(x) \
31 { .reg = (x) }
32
33 /**
34 * s3c_pm_do_save() - save a set of registers
35 * @ptr: Pointer to an array of registers.
36 * @count: Size of the ptr array.
37 *
38 * Run through the list of registers given, sa
39 * array for later restoration when we wakeup.
40 */
41 static void s3c_pm_do_save(struct sleep_save *
42 {
43 for (; count > 0; count--, ptr++) {
44 ptr->val = readl_relaxed(ptr->
45 S3C_PMDBG("saved %p value %08l
46 }
47 }
48
49 /**
50 * s3c_pm_do_restore_core() - restore register
51 * @ptr: Pointer to an array of registers.
52 * @count: Size of the ptr array.
53 *
54 * Restore the register values saved from s3c_
55 *
56 * WARNING: Do not put any debug in here that
57 * peripherals, as things may be changing!
58 */
59
60 static void s3c_pm_do_restore_core(const struc
61 {
62 for (; count > 0; count--, ptr++)
63 writel_relaxed(ptr->val, ptr->
64 }
65
66 static struct sleep_save s5pv210_core_save[] =
67 /* Clock ETC */
68 SAVE_ITEM(S5P_MDNIE_SEL),
69 };
70
71 /*
72 * VIC wake-up support (TODO)
73 */
74 static u32 s5pv210_irqwake_intmask = 0xfffffff
75
76 static u32 s5pv210_read_eint_wakeup_mask(void)
77 {
78 return __raw_readl(S5P_EINT_WAKEUP_MAS
79 }
80
81 /*
82 * Suspend helpers.
83 */
84 static int s5pv210_cpu_suspend(unsigned long a
85 {
86 unsigned long tmp;
87
88 /* issue the standby signal into the p
89 * issue a write-buffer drain just in
90
91 tmp = 0;
92
93 asm("b 1f\n\t"
94 ".align 5\n\t"
95 "1:\n\t"
96 "mcr p15, 0, %0, c7, c10, 5\n\t"
97 "mcr p15, 0, %0, c7, c10, 4\n\t"
98 "wfi" : : "r" (tmp));
99
100 pr_info("Failed to suspend the system\
101 return 1; /* Aborting suspend */
102 }
103
104 static void s5pv210_pm_prepare(void)
105 {
106 unsigned int tmp;
107
108 /*
109 * Set wake-up mask registers
110 * S5P_EINT_WAKEUP_MASK is set by pinc
111 */
112 __raw_writel(s5pv210_irqwake_intmask,
113
114 /* ensure at least INFORM0 has the res
115 __raw_writel(__pa_symbol(s5pv210_cpu_r
116
117 tmp = __raw_readl(S5P_SLEEP_CFG);
118 tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SL
119 __raw_writel(tmp, S5P_SLEEP_CFG);
120
121 /* WFI for SLEEP mode configuration by
122 tmp = __raw_readl(S5P_PWR_CFG);
123 tmp &= S5P_CFG_WFI_CLEAN;
124 tmp |= S5P_CFG_WFI_SLEEP;
125 __raw_writel(tmp, S5P_PWR_CFG);
126
127 /* SYSCON interrupt handling disable *
128 tmp = __raw_readl(S5P_OTHERS);
129 tmp |= S5P_OTHER_SYSC_INTOFF;
130 __raw_writel(tmp, S5P_OTHERS);
131
132 s3c_pm_do_save(s5pv210_core_save, ARRA
133 }
134
135 /*
136 * Suspend operations.
137 */
138 static int s5pv210_suspend_enter(suspend_state
139 {
140 u32 eint_wakeup_mask = s5pv210_read_ei
141 int ret;
142
143 S3C_PMDBG("%s: suspending the system..
144
145 S3C_PMDBG("%s: wakeup masks: %08x,%08x
146 s5pv210_irqwake_intmas
147
148 if (s5pv210_irqwake_intmask == -1U
149 && eint_wakeup_mask == -1U) {
150 pr_err("%s: No wake-up sources
151 pr_err("%s: Aborting sleep\n",
152 return -EINVAL;
153 }
154
155 s3c_pm_save_uarts(false);
156 s5pv210_pm_prepare();
157 flush_cache_all();
158 s3c_pm_check_store();
159
160 ret = cpu_suspend(0, s5pv210_cpu_suspe
161 if (ret)
162 return ret;
163
164 s3c_pm_restore_uarts(false);
165
166 S3C_PMDBG("%s: wakeup stat: %08x\n", _
167 __raw_readl(S5P_WAKEUP
168
169 s3c_pm_check_restore();
170
171 S3C_PMDBG("%s: resuming the system...\
172
173 return 0;
174 }
175
176 static int s5pv210_suspend_prepare(void)
177 {
178 s3c_pm_check_prepare();
179
180 return 0;
181 }
182
183 static void s5pv210_suspend_finish(void)
184 {
185 s3c_pm_check_cleanup();
186 }
187
188 static const struct platform_suspend_ops s5pv2
189 .enter = s5pv210_suspend_ente
190 .prepare = s5pv210_suspend_prep
191 .finish = s5pv210_suspend_fini
192 .valid = suspend_valid_only_m
193 };
194
195 /*
196 * Syscore operations used to delay restore of
197 */
198 static void s5pv210_pm_resume(void)
199 {
200 s3c_pm_do_restore_core(s5pv210_core_sa
201 }
202
203 static struct syscore_ops s5pv210_pm_syscore_o
204 .resume = s5pv210_pm_resume,
205 };
206
207 /*
208 * Initialization entry point.
209 */
210 void __init s5pv210_pm_init(void)
211 {
212 register_syscore_ops(&s5pv210_pm_sysco
213 suspend_set_ops(&s5pv210_suspend_ops);
214 }
215
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