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8#include <linux/cpu_pm.h>
9#include <linux/delay.h>
10#include <linux/init.h>
11#include <linux/io.h>
12#include <linux/ioport.h>
13#include <linux/of_address.h>
14#include <linux/smp.h>
15#include <linux/suspend.h>
16#include <linux/threads.h>
17#include <asm/cacheflush.h>
18#include <asm/cp15.h>
19#include <asm/proc-fns.h>
20#include <asm/smp_plat.h>
21#include <asm/suspend.h>
22#include "common.h"
23#include "rcar-gen2.h"
24
25static struct {
26 void __iomem *iomem;
27 int bit;
28} apmu_cpus[NR_CPUS];
29
30#define WUPCR_OFFS 0x10
31#define PSTR_OFFS 0x40
32#define CPUNCR_OFFS(n) (0x100 + (0x10 * (n)))
33
34#define DBGRCR_OFFS 0x180
35
36
37#define CPUNST(r, n) (((r) >> (n * 4)) & 3)
38#define CPUST_RUN 0
39#define CPUST_STANDBY 3
40
41
42#define DBGCPUREN BIT(24)
43#define DBGCPUNREN(n) BIT((n) + 20)
44#define DBGCPUPREN BIT(19)
45
46static int __maybe_unused apmu_power_on(void __iomem *p, int bit)
47{
48
49 writel_relaxed(BIT(bit), p + WUPCR_OFFS);
50
51
52 while (readl_relaxed(p + WUPCR_OFFS) != 0)
53 ;
54
55 return 0;
56}
57
58static int __maybe_unused apmu_power_off(void __iomem *p, int bit)
59{
60
61 writel_relaxed(3, p + CPUNCR_OFFS(bit));
62 return 0;
63}
64
65static int __maybe_unused apmu_power_off_poll(void __iomem *p, int bit)
66{
67 int k;
68
69 for (k = 0; k < 1000; k++) {
70 if (CPUNST(readl_relaxed(p + PSTR_OFFS), bit) == CPUST_STANDBY)
71 return 1;
72
73 mdelay(1);
74 }
75
76 return 0;
77}
78
79static int __maybe_unused apmu_wrap(int cpu, int (*fn)(void __iomem *p, int cpu))
80{
81 void __iomem *p = apmu_cpus[cpu].iomem;
82
83 return p ? fn(p, apmu_cpus[cpu].bit) : -EINVAL;
84}
85
86#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_SUSPEND)
87
88static inline void cpu_enter_lowpower_a15(void)
89{
90 unsigned int v;
91
92 asm volatile(
93 " mrc p15, 0, %0, c1, c0, 0\n"
94 " bic %0, %0, %1\n"
95 " mcr p15, 0, %0, c1, c0, 0\n"
96 : "=&r" (v)
97 : "Ir" (CR_C)
98 : "cc");
99
100 flush_cache_louis();
101
102 asm volatile(
103
104
105
106 " mrc p15, 0, %0, c1, c0, 1\n"
107 " bic %0, %0, %1\n"
108 " mcr p15, 0, %0, c1, c0, 1\n"
109 : "=&r" (v)
110 : "Ir" (0x40)
111 : "cc");
112
113 isb();
114 dsb();
115}
116
117static void shmobile_smp_apmu_cpu_shutdown(unsigned int cpu)
118{
119
120
121 apmu_wrap(cpu, apmu_power_off);
122
123
124 cpu_enter_lowpower_a15();
125}
126#endif
127
128#if defined(CONFIG_HOTPLUG_CPU)
129static void shmobile_smp_apmu_cpu_die(unsigned int cpu)
130{
131
132 shmobile_smp_hook(cpu, 0, 0);
133
134
135 shmobile_smp_apmu_cpu_shutdown(cpu);
136
137
138 shmobile_smp_sleep();
139}
140
141static int shmobile_smp_apmu_cpu_kill(unsigned int cpu)
142{
143 return apmu_wrap(cpu, apmu_power_off_poll);
144}
145#endif
146
147#if defined(CONFIG_SUSPEND)
148static int shmobile_smp_apmu_do_suspend(unsigned long cpu)
149{
150 shmobile_smp_hook(cpu, __pa_symbol(cpu_resume), 0);
151 shmobile_smp_apmu_cpu_shutdown(cpu);
152 cpu_do_idle();
153 return 1;
154}
155
156static inline void cpu_leave_lowpower(void)
157{
158 unsigned int v;
159
160 asm volatile("mrc p15, 0, %0, c1, c0, 0\n"
161 " orr %0, %0, %1\n"
162 " mcr p15, 0, %0, c1, c0, 0\n"
163 " mrc p15, 0, %0, c1, c0, 1\n"
164 " orr %0, %0, %2\n"
165 " mcr p15, 0, %0, c1, c0, 1\n"
166 : "=&r" (v)
167 : "Ir" (CR_C), "Ir" (0x40)
168 : "cc");
169}
170
171static int shmobile_smp_apmu_enter_suspend(suspend_state_t state)
172{
173 cpu_suspend(smp_processor_id(), shmobile_smp_apmu_do_suspend);
174 cpu_leave_lowpower();
175 return 0;
176}
177
178void __init shmobile_smp_apmu_suspend_init(void)
179{
180 shmobile_suspend_ops.enter = shmobile_smp_apmu_enter_suspend;
181}
182#endif
183
184#ifdef CONFIG_SMP
185static void apmu_init_cpu(struct resource *res, int cpu, int bit)
186{
187 u32 x;
188
189 if ((cpu >= ARRAY_SIZE(apmu_cpus)) || apmu_cpus[cpu].iomem)
190 return;
191
192 apmu_cpus[cpu].iomem = ioremap(res->start, resource_size(res));
193 apmu_cpus[cpu].bit = bit;
194
195 pr_debug("apmu ioremap %d %d %pr\n", cpu, bit, res);
196
197
198 x = readl(apmu_cpus[cpu].iomem + DBGRCR_OFFS);
199 x |= DBGCPUREN | DBGCPUNREN(bit) | DBGCPUPREN;
200 writel(x, apmu_cpus[cpu].iomem + DBGRCR_OFFS);
201}
202
203static const struct of_device_id apmu_ids[] = {
204 { .compatible = "renesas,apmu" },
205 { }
206};
207
208static void apmu_parse_dt(void (*fn)(struct resource *res, int cpu, int bit))
209{
210 struct device_node *np_apmu, *np_cpu;
211 struct resource res;
212 int bit, index;
213 u32 id;
214
215 for_each_matching_node(np_apmu, apmu_ids) {
216
217 bool is_allowed = false;
218
219 for (bit = 0; bit < CONFIG_NR_CPUS; bit++) {
220 np_cpu = of_parse_phandle(np_apmu, "cpus", bit);
221 if (np_cpu) {
222 if (!of_property_read_u32(np_cpu, "reg", &id)) {
223 if (id == cpu_logical_map(0)) {
224 is_allowed = true;
225 of_node_put(np_cpu);
226 break;
227 }
228
229 }
230 of_node_put(np_cpu);
231 }
232 }
233 if (!is_allowed)
234 continue;
235
236 for (bit = 0; bit < CONFIG_NR_CPUS; bit++) {
237 np_cpu = of_parse_phandle(np_apmu, "cpus", bit);
238 if (np_cpu) {
239 if (!of_property_read_u32(np_cpu, "reg", &id)) {
240 index = get_logical_index(id);
241 if ((index >= 0) &&
242 !of_address_to_resource(np_apmu,
243 0, &res))
244 fn(&res, index, bit);
245 }
246 of_node_put(np_cpu);
247 }
248 }
249 }
250}
251
252static void __init shmobile_smp_apmu_setup_boot(void)
253{
254
255 shmobile_boot_fn = __pa_symbol(shmobile_smp_boot);
256 shmobile_boot_fn_gen2 = shmobile_boot_fn;
257}
258
259static int shmobile_smp_apmu_boot_secondary(unsigned int cpu,
260 struct task_struct *idle)
261{
262
263 shmobile_smp_hook(cpu, __pa_symbol(shmobile_boot_apmu), 0);
264
265 return apmu_wrap(cpu, apmu_power_on);
266}
267
268static void __init shmobile_smp_apmu_prepare_cpus_dt(unsigned int max_cpus)
269{
270 shmobile_smp_apmu_setup_boot();
271 apmu_parse_dt(apmu_init_cpu);
272 rcar_gen2_pm_init();
273}
274
275static struct smp_operations apmu_smp_ops __initdata = {
276 .smp_prepare_cpus = shmobile_smp_apmu_prepare_cpus_dt,
277 .smp_boot_secondary = shmobile_smp_apmu_boot_secondary,
278#ifdef CONFIG_HOTPLUG_CPU
279 .cpu_can_disable = shmobile_smp_cpu_can_disable,
280 .cpu_die = shmobile_smp_apmu_cpu_die,
281 .cpu_kill = shmobile_smp_apmu_cpu_kill,
282#endif
283};
284
285CPU_METHOD_OF_DECLARE(shmobile_smp_apmu, "renesas,apmu", &apmu_smp_ops);
286#endif
287
