Commit | Line | Data |
---|---|---|
4552386a | 1 | /* |
7d30e8b3 KK |
2 | * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd. |
3 | * http://www.samsung.com | |
2b12b5c4 CY |
4 | * |
5 | * Cloned from linux/arch/arm/mach-vexpress/platsmp.c | |
6 | * | |
7 | * Copyright (C) 2002 ARM Ltd. | |
8 | * All Rights Reserved | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/init.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/delay.h> | |
2b12b5c4 CY |
18 | #include <linux/jiffies.h> |
19 | #include <linux/smp.h> | |
20 | #include <linux/io.h> | |
b3205dea | 21 | #include <linux/of_address.h> |
2262d6ef | 22 | #include <linux/soc/samsung/exynos-regs-pmu.h> |
2b12b5c4 CY |
23 | |
24 | #include <asm/cacheflush.h> | |
6f0b7c0c | 25 | #include <asm/cp15.h> |
eb50439b | 26 | #include <asm/smp_plat.h> |
2b12b5c4 | 27 | #include <asm/smp_scu.h> |
beddf63f | 28 | #include <asm/firmware.h> |
2b12b5c4 | 29 | |
2e94ac42 PD |
30 | #include <mach/map.h> |
31 | ||
06853ae4 MZ |
32 | #include "common.h" |
33 | ||
7d30e8b3 | 34 | extern void exynos4_secondary_startup(void); |
2b12b5c4 | 35 | |
6f0b7c0c | 36 | #ifdef CONFIG_HOTPLUG_CPU |
13cfa6c4 | 37 | static inline void cpu_leave_lowpower(u32 core_id) |
6f0b7c0c KK |
38 | { |
39 | unsigned int v; | |
40 | ||
41 | asm volatile( | |
42 | "mrc p15, 0, %0, c1, c0, 0\n" | |
43 | " orr %0, %0, %1\n" | |
44 | " mcr p15, 0, %0, c1, c0, 0\n" | |
45 | " mrc p15, 0, %0, c1, c0, 1\n" | |
46 | " orr %0, %0, %2\n" | |
47 | " mcr p15, 0, %0, c1, c0, 1\n" | |
48 | : "=&r" (v) | |
49 | : "Ir" (CR_C), "Ir" (0x40) | |
50 | : "cc"); | |
51 | } | |
52 | ||
53 | static inline void platform_do_lowpower(unsigned int cpu, int *spurious) | |
54 | { | |
55 | u32 mpidr = cpu_logical_map(cpu); | |
56 | u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
57 | ||
58 | for (;;) { | |
59 | ||
60 | /* Turn the CPU off on next WFI instruction. */ | |
61 | exynos_cpu_power_down(core_id); | |
62 | ||
63 | wfi(); | |
64 | ||
65 | if (pen_release == core_id) { | |
66 | /* | |
67 | * OK, proper wakeup, we're done | |
68 | */ | |
69 | break; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Getting here, means that we have come out of WFI without | |
74 | * having been woken up - this shouldn't happen | |
75 | * | |
76 | * Just note it happening - when we're woken, we can report | |
77 | * its occurrence. | |
78 | */ | |
79 | (*spurious)++; | |
80 | } | |
81 | } | |
82 | #endif /* CONFIG_HOTPLUG_CPU */ | |
83 | ||
7310d99f KK |
84 | /** |
85 | * exynos_core_power_down : power down the specified cpu | |
86 | * @cpu : the cpu to power down | |
87 | * | |
88 | * Power down the specified cpu. The sequence must be finished by a | |
89 | * call to cpu_do_idle() | |
90 | * | |
91 | */ | |
92 | void exynos_cpu_power_down(int cpu) | |
93 | { | |
497ab3b3 BZ |
94 | u32 core_conf; |
95 | ||
ca489c58 | 96 | if (cpu == 0 && (soc_is_exynos5420() || soc_is_exynos5800())) { |
adc548d7 AK |
97 | /* |
98 | * Bypass power down for CPU0 during suspend. Check for | |
99 | * the SYS_PWR_REG value to decide if we are suspending | |
100 | * the system. | |
101 | */ | |
102 | int val = pmu_raw_readl(EXYNOS5_ARM_CORE0_SYS_PWR_REG); | |
103 | ||
104 | if (!(val & S5P_CORE_LOCAL_PWR_EN)) | |
105 | return; | |
106 | } | |
497ab3b3 BZ |
107 | |
108 | core_conf = pmu_raw_readl(EXYNOS_ARM_CORE_CONFIGURATION(cpu)); | |
109 | core_conf &= ~S5P_CORE_LOCAL_PWR_EN; | |
110 | pmu_raw_writel(core_conf, EXYNOS_ARM_CORE_CONFIGURATION(cpu)); | |
7310d99f KK |
111 | } |
112 | ||
113 | /** | |
114 | * exynos_cpu_power_up : power up the specified cpu | |
115 | * @cpu : the cpu to power up | |
116 | * | |
117 | * Power up the specified cpu | |
118 | */ | |
119 | void exynos_cpu_power_up(int cpu) | |
120 | { | |
497ab3b3 BZ |
121 | u32 core_conf = S5P_CORE_LOCAL_PWR_EN; |
122 | ||
123 | if (soc_is_exynos3250()) | |
124 | core_conf |= S5P_CORE_AUTOWAKEUP_EN; | |
125 | ||
126 | pmu_raw_writel(core_conf, | |
944483d0 | 127 | EXYNOS_ARM_CORE_CONFIGURATION(cpu)); |
7310d99f KK |
128 | } |
129 | ||
130 | /** | |
131 | * exynos_cpu_power_state : returns the power state of the cpu | |
132 | * @cpu : the cpu to retrieve the power state from | |
133 | * | |
134 | */ | |
135 | int exynos_cpu_power_state(int cpu) | |
136 | { | |
944483d0 | 137 | return (pmu_raw_readl(EXYNOS_ARM_CORE_STATUS(cpu)) & |
7310d99f KK |
138 | S5P_CORE_LOCAL_PWR_EN); |
139 | } | |
140 | ||
141 | /** | |
142 | * exynos_cluster_power_down : power down the specified cluster | |
143 | * @cluster : the cluster to power down | |
144 | */ | |
145 | void exynos_cluster_power_down(int cluster) | |
146 | { | |
944483d0 | 147 | pmu_raw_writel(0, EXYNOS_COMMON_CONFIGURATION(cluster)); |
7310d99f KK |
148 | } |
149 | ||
150 | /** | |
151 | * exynos_cluster_power_up : power up the specified cluster | |
152 | * @cluster : the cluster to power up | |
153 | */ | |
154 | void exynos_cluster_power_up(int cluster) | |
155 | { | |
944483d0 AB |
156 | pmu_raw_writel(S5P_CORE_LOCAL_PWR_EN, |
157 | EXYNOS_COMMON_CONFIGURATION(cluster)); | |
7310d99f KK |
158 | } |
159 | ||
160 | /** | |
161 | * exynos_cluster_power_state : returns the power state of the cluster | |
162 | * @cluster : the cluster to retrieve the power state from | |
163 | * | |
164 | */ | |
165 | int exynos_cluster_power_state(int cluster) | |
166 | { | |
944483d0 AB |
167 | return (pmu_raw_readl(EXYNOS_COMMON_STATUS(cluster)) & |
168 | S5P_CORE_LOCAL_PWR_EN); | |
7310d99f KK |
169 | } |
170 | ||
af997114 | 171 | static void __iomem *cpu_boot_reg_base(void) |
1f054f52 TF |
172 | { |
173 | if (soc_is_exynos4210() && samsung_rev() == EXYNOS4210_REV_1_1) | |
2e94ac42 | 174 | return pmu_base_addr + S5P_INFORM5; |
b3205dea | 175 | return sysram_base_addr; |
1f054f52 TF |
176 | } |
177 | ||
178 | static inline void __iomem *cpu_boot_reg(int cpu) | |
179 | { | |
180 | void __iomem *boot_reg; | |
181 | ||
182 | boot_reg = cpu_boot_reg_base(); | |
b3205dea | 183 | if (!boot_reg) |
2cc6b813 | 184 | return IOMEM_ERR_PTR(-ENODEV); |
1f054f52 TF |
185 | if (soc_is_exynos4412()) |
186 | boot_reg += 4*cpu; | |
86c6f148 | 187 | else if (soc_is_exynos5420() || soc_is_exynos5800()) |
1580be3d | 188 | boot_reg += 4; |
1f054f52 TF |
189 | return boot_reg; |
190 | } | |
911c29b0 | 191 | |
b588aaec KK |
192 | /* |
193 | * Set wake up by local power mode and execute software reset for given core. | |
194 | * | |
195 | * Currently this is needed only when booting secondary CPU on Exynos3250. | |
196 | */ | |
af997114 | 197 | void exynos_core_restart(u32 core_id) |
b588aaec KK |
198 | { |
199 | u32 val; | |
200 | ||
201 | if (!of_machine_is_compatible("samsung,exynos3250")) | |
202 | return; | |
203 | ||
497ab3b3 BZ |
204 | while (!pmu_raw_readl(S5P_PMU_SPARE2)) |
205 | udelay(10); | |
206 | udelay(10); | |
207 | ||
b588aaec KK |
208 | val = pmu_raw_readl(EXYNOS_ARM_CORE_STATUS(core_id)); |
209 | val |= S5P_CORE_WAKEUP_FROM_LOCAL_CFG; | |
210 | pmu_raw_writel(val, EXYNOS_ARM_CORE_STATUS(core_id)); | |
211 | ||
b588aaec KK |
212 | pmu_raw_writel(EXYNOS_CORE_PO_RESET(core_id), EXYNOS_SWRESET); |
213 | } | |
214 | ||
3705ff6d RK |
215 | /* |
216 | * Write pen_release in a way that is guaranteed to be visible to all | |
217 | * observers, irrespective of whether they're taking part in coherency | |
218 | * or not. This is necessary for the hotplug code to work reliably. | |
219 | */ | |
220 | static void write_pen_release(int val) | |
221 | { | |
222 | pen_release = val; | |
223 | smp_wmb(); | |
f45913fd | 224 | sync_cache_w(&pen_release); |
3705ff6d RK |
225 | } |
226 | ||
2b12b5c4 CY |
227 | static void __iomem *scu_base_addr(void) |
228 | { | |
229 | return (void __iomem *)(S5P_VA_SCU); | |
230 | } | |
231 | ||
232 | static DEFINE_SPINLOCK(boot_lock); | |
233 | ||
8bd26e3a | 234 | static void exynos_secondary_init(unsigned int cpu) |
2b12b5c4 | 235 | { |
2b12b5c4 CY |
236 | /* |
237 | * let the primary processor know we're out of the | |
238 | * pen, then head off into the C entry point | |
239 | */ | |
3705ff6d | 240 | write_pen_release(-1); |
2b12b5c4 CY |
241 | |
242 | /* | |
243 | * Synchronise with the boot thread. | |
244 | */ | |
245 | spin_lock(&boot_lock); | |
246 | spin_unlock(&boot_lock); | |
247 | } | |
248 | ||
af997114 | 249 | int exynos_set_boot_addr(u32 core_id, unsigned long boot_addr) |
955d4cf8 BZ |
250 | { |
251 | int ret; | |
252 | ||
253 | /* | |
254 | * Try to set boot address using firmware first | |
255 | * and fall back to boot register if it fails. | |
256 | */ | |
257 | ret = call_firmware_op(set_cpu_boot_addr, core_id, boot_addr); | |
258 | if (ret && ret != -ENOSYS) | |
259 | goto fail; | |
260 | if (ret == -ENOSYS) { | |
261 | void __iomem *boot_reg = cpu_boot_reg(core_id); | |
262 | ||
263 | if (IS_ERR(boot_reg)) { | |
264 | ret = PTR_ERR(boot_reg); | |
265 | goto fail; | |
266 | } | |
267 | __raw_writel(boot_addr, boot_reg); | |
268 | ret = 0; | |
269 | } | |
270 | fail: | |
271 | return ret; | |
272 | } | |
273 | ||
af997114 | 274 | int exynos_get_boot_addr(u32 core_id, unsigned long *boot_addr) |
1225ad72 BZ |
275 | { |
276 | int ret; | |
277 | ||
278 | /* | |
279 | * Try to get boot address using firmware first | |
280 | * and fall back to boot register if it fails. | |
281 | */ | |
282 | ret = call_firmware_op(get_cpu_boot_addr, core_id, boot_addr); | |
283 | if (ret && ret != -ENOSYS) | |
284 | goto fail; | |
285 | if (ret == -ENOSYS) { | |
286 | void __iomem *boot_reg = cpu_boot_reg(core_id); | |
287 | ||
288 | if (IS_ERR(boot_reg)) { | |
289 | ret = PTR_ERR(boot_reg); | |
290 | goto fail; | |
291 | } | |
292 | *boot_addr = __raw_readl(boot_reg); | |
293 | ret = 0; | |
294 | } | |
295 | fail: | |
296 | return ret; | |
297 | } | |
298 | ||
8bd26e3a | 299 | static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle) |
2b12b5c4 CY |
300 | { |
301 | unsigned long timeout; | |
9637f30e TF |
302 | u32 mpidr = cpu_logical_map(cpu); |
303 | u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
b3205dea | 304 | int ret = -ENOSYS; |
2b12b5c4 CY |
305 | |
306 | /* | |
307 | * Set synchronisation state between this boot processor | |
308 | * and the secondary one | |
309 | */ | |
310 | spin_lock(&boot_lock); | |
311 | ||
312 | /* | |
313 | * The secondary processor is waiting to be released from | |
314 | * the holding pen - release it, then wait for it to flag | |
315 | * that it has been released by resetting pen_release. | |
316 | * | |
9637f30e | 317 | * Note that "pen_release" is the hardware CPU core ID, whereas |
2b12b5c4 CY |
318 | * "cpu" is Linux's internal ID. |
319 | */ | |
9637f30e | 320 | write_pen_release(core_id); |
2b12b5c4 | 321 | |
9637f30e TF |
322 | if (!exynos_cpu_power_state(core_id)) { |
323 | exynos_cpu_power_up(core_id); | |
911c29b0 JM |
324 | timeout = 10; |
325 | ||
326 | /* wait max 10 ms until cpu1 is on */ | |
9637f30e TF |
327 | while (exynos_cpu_power_state(core_id) |
328 | != S5P_CORE_LOCAL_PWR_EN) { | |
911c29b0 JM |
329 | if (timeout-- == 0) |
330 | break; | |
331 | ||
332 | mdelay(1); | |
333 | } | |
334 | ||
335 | if (timeout == 0) { | |
336 | printk(KERN_ERR "cpu1 power enable failed"); | |
337 | spin_unlock(&boot_lock); | |
338 | return -ETIMEDOUT; | |
339 | } | |
340 | } | |
b588aaec KK |
341 | |
342 | exynos_core_restart(core_id); | |
343 | ||
2b12b5c4 CY |
344 | /* |
345 | * Send the secondary CPU a soft interrupt, thereby causing | |
346 | * the boot monitor to read the system wide flags register, | |
347 | * and branch to the address found there. | |
348 | */ | |
2b12b5c4 CY |
349 | |
350 | timeout = jiffies + (1 * HZ); | |
351 | while (time_before(jiffies, timeout)) { | |
beddf63f TF |
352 | unsigned long boot_addr; |
353 | ||
2b12b5c4 | 354 | smp_rmb(); |
911c29b0 | 355 | |
beddf63f TF |
356 | boot_addr = virt_to_phys(exynos4_secondary_startup); |
357 | ||
955d4cf8 BZ |
358 | ret = exynos_set_boot_addr(core_id, boot_addr); |
359 | if (ret) | |
b3205dea | 360 | goto fail; |
beddf63f | 361 | |
9637f30e | 362 | call_firmware_op(cpu_boot, core_id); |
beddf63f | 363 | |
497ab3b3 BZ |
364 | if (soc_is_exynos3250()) |
365 | dsb_sev(); | |
366 | else | |
367 | arch_send_wakeup_ipi_mask(cpumask_of(cpu)); | |
911c29b0 | 368 | |
2b12b5c4 CY |
369 | if (pen_release == -1) |
370 | break; | |
371 | ||
372 | udelay(10); | |
373 | } | |
374 | ||
9f294c17 BZ |
375 | if (pen_release != -1) |
376 | ret = -ETIMEDOUT; | |
377 | ||
2b12b5c4 CY |
378 | /* |
379 | * now the secondary core is starting up let it run its | |
380 | * calibrations, then wait for it to finish | |
381 | */ | |
b3205dea | 382 | fail: |
2b12b5c4 CY |
383 | spin_unlock(&boot_lock); |
384 | ||
b3205dea | 385 | return pen_release != -1 ? ret : 0; |
2b12b5c4 CY |
386 | } |
387 | ||
388 | /* | |
389 | * Initialise the CPU possible map early - this describes the CPUs | |
390 | * which may be present or become present in the system. | |
391 | */ | |
392 | ||
06853ae4 | 393 | static void __init exynos_smp_init_cpus(void) |
2b12b5c4 CY |
394 | { |
395 | void __iomem *scu_base = scu_base_addr(); | |
396 | unsigned int i, ncores; | |
397 | ||
af040ffc | 398 | if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) |
e9bba615 | 399 | ncores = scu_base ? scu_get_core_count(scu_base) : 1; |
1897d2f3 CK |
400 | else |
401 | /* | |
402 | * CPU Nodes are passed thru DT and set_cpu_possible | |
403 | * is set by "arm_dt_init_cpu_maps". | |
404 | */ | |
405 | return; | |
2b12b5c4 CY |
406 | |
407 | /* sanity check */ | |
a06f916b RK |
408 | if (ncores > nr_cpu_ids) { |
409 | pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", | |
410 | ncores, nr_cpu_ids); | |
411 | ncores = nr_cpu_ids; | |
2b12b5c4 CY |
412 | } |
413 | ||
414 | for (i = 0; i < ncores; i++) | |
415 | set_cpu_possible(i, true); | |
416 | } | |
417 | ||
06853ae4 | 418 | static void __init exynos_smp_prepare_cpus(unsigned int max_cpus) |
2b12b5c4 | 419 | { |
1f054f52 TF |
420 | int i; |
421 | ||
1754c42e OJ |
422 | exynos_sysram_init(); |
423 | ||
6f024978 KK |
424 | exynos_set_delayed_reset_assertion(true); |
425 | ||
af040ffc | 426 | if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) |
e9bba615 | 427 | scu_enable(scu_base_addr()); |
05c74a6c | 428 | |
2b12b5c4 | 429 | /* |
05c74a6c RK |
430 | * Write the address of secondary startup into the |
431 | * system-wide flags register. The boot monitor waits | |
432 | * until it receives a soft interrupt, and then the | |
433 | * secondary CPU branches to this address. | |
beddf63f TF |
434 | * |
435 | * Try using firmware operation first and fall back to | |
436 | * boot register if it fails. | |
2b12b5c4 | 437 | */ |
beddf63f | 438 | for (i = 1; i < max_cpus; ++i) { |
beddf63f | 439 | unsigned long boot_addr; |
9637f30e TF |
440 | u32 mpidr; |
441 | u32 core_id; | |
b3205dea | 442 | int ret; |
beddf63f | 443 | |
9637f30e TF |
444 | mpidr = cpu_logical_map(i); |
445 | core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
beddf63f TF |
446 | boot_addr = virt_to_phys(exynos4_secondary_startup); |
447 | ||
955d4cf8 BZ |
448 | ret = exynos_set_boot_addr(core_id, boot_addr); |
449 | if (ret) | |
b3205dea | 450 | break; |
beddf63f | 451 | } |
2b12b5c4 | 452 | } |
06853ae4 | 453 | |
6f0b7c0c KK |
454 | #ifdef CONFIG_HOTPLUG_CPU |
455 | /* | |
456 | * platform-specific code to shutdown a CPU | |
457 | * | |
458 | * Called with IRQs disabled | |
459 | */ | |
27b9ee85 | 460 | static void exynos_cpu_die(unsigned int cpu) |
6f0b7c0c KK |
461 | { |
462 | int spurious = 0; | |
13cfa6c4 KK |
463 | u32 mpidr = cpu_logical_map(cpu); |
464 | u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
6f0b7c0c KK |
465 | |
466 | v7_exit_coherency_flush(louis); | |
467 | ||
468 | platform_do_lowpower(cpu, &spurious); | |
469 | ||
470 | /* | |
471 | * bring this CPU back into the world of cache | |
472 | * coherency, and then restore interrupts | |
473 | */ | |
13cfa6c4 | 474 | cpu_leave_lowpower(core_id); |
6f0b7c0c KK |
475 | |
476 | if (spurious) | |
477 | pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious); | |
478 | } | |
479 | #endif /* CONFIG_HOTPLUG_CPU */ | |
480 | ||
75305275 | 481 | const struct smp_operations exynos_smp_ops __initconst = { |
06853ae4 MZ |
482 | .smp_init_cpus = exynos_smp_init_cpus, |
483 | .smp_prepare_cpus = exynos_smp_prepare_cpus, | |
484 | .smp_secondary_init = exynos_secondary_init, | |
485 | .smp_boot_secondary = exynos_boot_secondary, | |
486 | #ifdef CONFIG_HOTPLUG_CPU | |
487 | .cpu_die = exynos_cpu_die, | |
488 | #endif | |
489 | }; |