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Commit | Line | Data |
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907d6deb | 1 | /* |
9d041268 | 2 | * arch/arm/mach-at91/pm.c |
907d6deb AV |
3 | * AT91 Power Management |
4 | * | |
5 | * Copyright (C) 2005 David Brownell | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
12 | ||
2f8163ba | 13 | #include <linux/gpio.h> |
95d9ffbe | 14 | #include <linux/suspend.h> |
907d6deb AV |
15 | #include <linux/sched.h> |
16 | #include <linux/proc_fs.h> | |
d2e46790 | 17 | #include <linux/genalloc.h> |
907d6deb AV |
18 | #include <linux/interrupt.h> |
19 | #include <linux/sysfs.h> | |
20 | #include <linux/module.h> | |
f5598d34 | 21 | #include <linux/of.h> |
d2e46790 | 22 | #include <linux/of_platform.h> |
827de1f1 | 23 | #include <linux/of_address.h> |
907d6deb | 24 | #include <linux/platform_device.h> |
fced80c7 | 25 | #include <linux/io.h> |
2edb90ae | 26 | #include <linux/clk/at91_pmc.h> |
907d6deb | 27 | |
907d6deb | 28 | #include <asm/irq.h> |
60063497 | 29 | #include <linux/atomic.h> |
907d6deb AV |
30 | #include <asm/mach/time.h> |
31 | #include <asm/mach/irq.h> | |
d94e688c | 32 | #include <asm/fncpy.h> |
385acc0d | 33 | #include <asm/cacheflush.h> |
907d6deb | 34 | |
907d6deb | 35 | #include "generic.h" |
1ea60cf7 | 36 | #include "pm.h" |
907d6deb | 37 | |
23b84082 AB |
38 | /* |
39 | * FIXME: this is needed to communicate between the pinctrl driver and | |
40 | * the PM implementation in the machine. Possibly part of the PM | |
41 | * implementation should be moved down into the pinctrl driver and get | |
42 | * called as part of the generic suspend/resume path. | |
43 | */ | |
8423536f | 44 | #ifdef CONFIG_PINCTRL_AT91 |
23b84082 AB |
45 | extern void at91_pinctrl_gpio_suspend(void); |
46 | extern void at91_pinctrl_gpio_resume(void); | |
8423536f | 47 | #endif |
23b84082 | 48 | |
f5598d34 AB |
49 | static struct { |
50 | unsigned long uhp_udp_mask; | |
51 | int memctrl; | |
52 | } at91_pm_data; | |
53 | ||
827de1f1 | 54 | void __iomem *at91_ramc_base[2]; |
5ad945ea | 55 | |
907d6deb AV |
56 | static int at91_pm_valid_state(suspend_state_t state) |
57 | { | |
58 | switch (state) { | |
59 | case PM_SUSPEND_ON: | |
60 | case PM_SUSPEND_STANDBY: | |
61 | case PM_SUSPEND_MEM: | |
62 | return 1; | |
63 | ||
64 | default: | |
65 | return 0; | |
66 | } | |
67 | } | |
68 | ||
69 | ||
70 | static suspend_state_t target_state; | |
71 | ||
72 | /* | |
73 | * Called after processes are frozen, but before we shutdown devices. | |
74 | */ | |
c697eece | 75 | static int at91_pm_begin(suspend_state_t state) |
907d6deb AV |
76 | { |
77 | target_state = state; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | /* | |
82 | * Verify that all the clocks are correct before entering | |
83 | * slow-clock mode. | |
84 | */ | |
85 | static int at91_pm_verify_clocks(void) | |
86 | { | |
87 | unsigned long scsr; | |
88 | int i; | |
89 | ||
b5514952 | 90 | scsr = at91_pmc_read(AT91_PMC_SCSR); |
907d6deb AV |
91 | |
92 | /* USB must not be using PLLB */ | |
f5598d34 AB |
93 | if ((scsr & at91_pm_data.uhp_udp_mask) != 0) { |
94 | pr_err("AT91: PM - Suspend-to-RAM with USB still active\n"); | |
95 | return 0; | |
907d6deb AV |
96 | } |
97 | ||
907d6deb AV |
98 | /* PCK0..PCK3 must be disabled, or configured to use clk32k */ |
99 | for (i = 0; i < 4; i++) { | |
100 | u32 css; | |
101 | ||
102 | if ((scsr & (AT91_PMC_PCK0 << i)) == 0) | |
103 | continue; | |
104 | ||
b5514952 | 105 | css = at91_pmc_read(AT91_PMC_PCKR(i)) & AT91_PMC_CSS; |
907d6deb | 106 | if (css != AT91_PMC_CSS_SLOW) { |
7f96b1ca | 107 | pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css); |
907d6deb AV |
108 | return 0; |
109 | } | |
110 | } | |
907d6deb AV |
111 | |
112 | return 1; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Call this from platform driver suspend() to see how deeply to suspend. | |
117 | * For example, some controllers (like OHCI) need one of the PLL clocks | |
118 | * in order to act as a wakeup source, and those are not available when | |
119 | * going into slow clock mode. | |
120 | * | |
121 | * REVISIT: generalize as clk_will_be_available(clk)? Other platforms have | |
122 | * the very same problem (but not using at91 main_clk), and it'd be better | |
123 | * to add one generic API rather than lots of platform-specific ones. | |
124 | */ | |
125 | int at91_suspend_entering_slow_clock(void) | |
126 | { | |
127 | return (target_state == PM_SUSPEND_MEM); | |
128 | } | |
129 | EXPORT_SYMBOL(at91_suspend_entering_slow_clock); | |
130 | ||
5726a8b9 | 131 | static void (*at91_suspend_sram_fn)(void __iomem *pmc, void __iomem *ramc0, |
fb7e197b | 132 | void __iomem *ramc1, int memctrl); |
907d6deb | 133 | |
5726a8b9 | 134 | extern void at91_pm_suspend_in_sram(void __iomem *pmc, void __iomem *ramc0, |
fb7e197b | 135 | void __iomem *ramc1, int memctrl); |
5726a8b9 | 136 | extern u32 at91_pm_suspend_in_sram_sz; |
f5d0f457 | 137 | |
23be4be5 WY |
138 | static void at91_pm_suspend(suspend_state_t state) |
139 | { | |
140 | unsigned int pm_data = at91_pm_data.memctrl; | |
141 | ||
142 | pm_data |= (state == PM_SUSPEND_MEM) ? | |
143 | AT91_PM_MODE(AT91_PM_SLOW_CLOCK) : 0; | |
144 | ||
385acc0d WY |
145 | flush_cache_all(); |
146 | outer_disable(); | |
147 | ||
5726a8b9 WY |
148 | at91_suspend_sram_fn(at91_pmc_base, at91_ramc_base[0], |
149 | at91_ramc_base[1], pm_data); | |
385acc0d WY |
150 | |
151 | outer_resume(); | |
23be4be5 WY |
152 | } |
153 | ||
907d6deb AV |
154 | static int at91_pm_enter(suspend_state_t state) |
155 | { | |
8423536f | 156 | #ifdef CONFIG_PINCTRL_AT91 |
85c4b31e | 157 | at91_pinctrl_gpio_suspend(); |
8423536f | 158 | #endif |
907d6deb | 159 | switch (state) { |
23be4be5 WY |
160 | /* |
161 | * Suspend-to-RAM is like STANDBY plus slow clock mode, so | |
162 | * drivers must suspend more deeply, the master clock switches | |
163 | * to the clk32k and turns off the main oscillator | |
164 | */ | |
165 | case PM_SUSPEND_MEM: | |
907d6deb | 166 | /* |
23be4be5 | 167 | * Ensure that clocks are in a valid state. |
907d6deb | 168 | */ |
23be4be5 WY |
169 | if (!at91_pm_verify_clocks()) |
170 | goto error; | |
907d6deb | 171 | |
23be4be5 | 172 | at91_pm_suspend(state); |
907d6deb | 173 | |
23be4be5 | 174 | break; |
907d6deb | 175 | |
23be4be5 WY |
176 | /* |
177 | * STANDBY mode has *all* drivers suspended; ignores irqs not | |
178 | * marked as 'wakeup' event sources; and reduces DRAM power. | |
179 | * But otherwise it's identical to PM_SUSPEND_ON: cpu idle, and | |
180 | * nothing fancy done with main or cpu clocks. | |
181 | */ | |
182 | case PM_SUSPEND_STANDBY: | |
183 | at91_pm_suspend(state); | |
184 | break; | |
185 | ||
186 | case PM_SUSPEND_ON: | |
187 | cpu_do_idle(); | |
188 | break; | |
189 | ||
190 | default: | |
191 | pr_debug("AT91: PM - bogus suspend state %d\n", state); | |
192 | goto error; | |
907d6deb AV |
193 | } |
194 | ||
907d6deb AV |
195 | error: |
196 | target_state = PM_SUSPEND_ON; | |
07192604 | 197 | |
8423536f | 198 | #ifdef CONFIG_PINCTRL_AT91 |
85c4b31e | 199 | at91_pinctrl_gpio_resume(); |
8423536f | 200 | #endif |
907d6deb AV |
201 | return 0; |
202 | } | |
203 | ||
c697eece RW |
204 | /* |
205 | * Called right prior to thawing processes. | |
206 | */ | |
207 | static void at91_pm_end(void) | |
208 | { | |
209 | target_state = PM_SUSPEND_ON; | |
210 | } | |
211 | ||
907d6deb | 212 | |
2f55ac07 | 213 | static const struct platform_suspend_ops at91_pm_ops = { |
c697eece RW |
214 | .valid = at91_pm_valid_state, |
215 | .begin = at91_pm_begin, | |
216 | .enter = at91_pm_enter, | |
217 | .end = at91_pm_end, | |
907d6deb AV |
218 | }; |
219 | ||
5ad945ea DL |
220 | static struct platform_device at91_cpuidle_device = { |
221 | .name = "cpuidle-at91", | |
222 | }; | |
223 | ||
047794e1 | 224 | static void at91_pm_set_standby(void (*at91_standby)(void)) |
5ad945ea | 225 | { |
e32d995c | 226 | if (at91_standby) |
5ad945ea | 227 | at91_cpuidle_device.dev.platform_data = at91_standby; |
5ad945ea DL |
228 | } |
229 | ||
a18d0699 AB |
230 | /* |
231 | * The AT91RM9200 goes into self-refresh mode with this command, and will | |
232 | * terminate self-refresh automatically on the next SDRAM access. | |
233 | * | |
234 | * Self-refresh mode is exited as soon as a memory access is made, but we don't | |
235 | * know for sure when that happens. However, we need to restore the low-power | |
236 | * mode if it was enabled before going idle. Restoring low-power mode while | |
237 | * still in self-refresh is "not recommended", but seems to work. | |
238 | */ | |
239 | static void at91rm9200_standby(void) | |
240 | { | |
d7d45f25 | 241 | u32 lpr = at91_ramc_read(0, AT91_MC_SDRAMC_LPR); |
a18d0699 AB |
242 | |
243 | asm volatile( | |
244 | "b 1f\n\t" | |
245 | ".align 5\n\t" | |
246 | "1: mcr p15, 0, %0, c7, c10, 4\n\t" | |
247 | " str %0, [%1, %2]\n\t" | |
248 | " str %3, [%1, %4]\n\t" | |
249 | " mcr p15, 0, %0, c7, c0, 4\n\t" | |
250 | " str %5, [%1, %2]" | |
251 | : | |
d7d45f25 AB |
252 | : "r" (0), "r" (at91_ramc_base[0]), "r" (AT91_MC_SDRAMC_LPR), |
253 | "r" (1), "r" (AT91_MC_SDRAMC_SRR), | |
a18d0699 AB |
254 | "r" (lpr)); |
255 | } | |
256 | ||
257 | /* We manage both DDRAM/SDRAM controllers, we need more than one value to | |
258 | * remember. | |
259 | */ | |
260 | static void at91_ddr_standby(void) | |
261 | { | |
262 | /* Those two values allow us to delay self-refresh activation | |
263 | * to the maximum. */ | |
264 | u32 lpr0, lpr1 = 0; | |
265 | u32 saved_lpr0, saved_lpr1 = 0; | |
266 | ||
267 | if (at91_ramc_base[1]) { | |
268 | saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR); | |
269 | lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB; | |
270 | lpr1 |= AT91_DDRSDRC_LPCB_SELF_REFRESH; | |
271 | } | |
272 | ||
273 | saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR); | |
274 | lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB; | |
275 | lpr0 |= AT91_DDRSDRC_LPCB_SELF_REFRESH; | |
276 | ||
277 | /* self-refresh mode now */ | |
278 | at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0); | |
279 | if (at91_ramc_base[1]) | |
280 | at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1); | |
281 | ||
282 | cpu_do_idle(); | |
283 | ||
284 | at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0); | |
285 | if (at91_ramc_base[1]) | |
286 | at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1); | |
287 | } | |
288 | ||
289 | /* We manage both DDRAM/SDRAM controllers, we need more than one value to | |
290 | * remember. | |
291 | */ | |
292 | static void at91sam9_sdram_standby(void) | |
293 | { | |
294 | u32 lpr0, lpr1 = 0; | |
295 | u32 saved_lpr0, saved_lpr1 = 0; | |
296 | ||
297 | if (at91_ramc_base[1]) { | |
298 | saved_lpr1 = at91_ramc_read(1, AT91_SDRAMC_LPR); | |
299 | lpr1 = saved_lpr1 & ~AT91_SDRAMC_LPCB; | |
300 | lpr1 |= AT91_SDRAMC_LPCB_SELF_REFRESH; | |
301 | } | |
302 | ||
303 | saved_lpr0 = at91_ramc_read(0, AT91_SDRAMC_LPR); | |
304 | lpr0 = saved_lpr0 & ~AT91_SDRAMC_LPCB; | |
305 | lpr0 |= AT91_SDRAMC_LPCB_SELF_REFRESH; | |
306 | ||
307 | /* self-refresh mode now */ | |
308 | at91_ramc_write(0, AT91_SDRAMC_LPR, lpr0); | |
309 | if (at91_ramc_base[1]) | |
310 | at91_ramc_write(1, AT91_SDRAMC_LPR, lpr1); | |
311 | ||
312 | cpu_do_idle(); | |
313 | ||
314 | at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr0); | |
315 | if (at91_ramc_base[1]) | |
316 | at91_ramc_write(1, AT91_SDRAMC_LPR, saved_lpr1); | |
317 | } | |
318 | ||
19c233b7 | 319 | static const struct of_device_id const ramc_ids[] __initconst = { |
827de1f1 AB |
320 | { .compatible = "atmel,at91rm9200-sdramc", .data = at91rm9200_standby }, |
321 | { .compatible = "atmel,at91sam9260-sdramc", .data = at91sam9_sdram_standby }, | |
322 | { .compatible = "atmel,at91sam9g45-ddramc", .data = at91_ddr_standby }, | |
323 | { .compatible = "atmel,sama5d3-ddramc", .data = at91_ddr_standby }, | |
324 | { /*sentinel*/ } | |
325 | }; | |
326 | ||
444d2d33 | 327 | static __init void at91_dt_ramc(void) |
827de1f1 AB |
328 | { |
329 | struct device_node *np; | |
330 | const struct of_device_id *of_id; | |
331 | int idx = 0; | |
332 | const void *standby = NULL; | |
333 | ||
334 | for_each_matching_node_and_match(np, ramc_ids, &of_id) { | |
335 | at91_ramc_base[idx] = of_iomap(np, 0); | |
336 | if (!at91_ramc_base[idx]) | |
337 | panic(pr_fmt("unable to map ramc[%d] cpu registers\n"), idx); | |
338 | ||
339 | if (!standby) | |
340 | standby = of_id->data; | |
341 | ||
342 | idx++; | |
343 | } | |
344 | ||
345 | if (!idx) | |
346 | panic(pr_fmt("unable to find compatible ram controller node in dtb\n")); | |
347 | ||
348 | if (!standby) { | |
349 | pr_warn("ramc no standby function available\n"); | |
350 | return; | |
351 | } | |
352 | ||
353 | at91_pm_set_standby(standby); | |
354 | } | |
355 | ||
d2e46790 AB |
356 | static void __init at91_pm_sram_init(void) |
357 | { | |
358 | struct gen_pool *sram_pool; | |
359 | phys_addr_t sram_pbase; | |
360 | unsigned long sram_base; | |
361 | struct device_node *node; | |
4a031f7d | 362 | struct platform_device *pdev = NULL; |
d2e46790 | 363 | |
4a031f7d AB |
364 | for_each_compatible_node(node, NULL, "mmio-sram") { |
365 | pdev = of_find_device_by_node(node); | |
366 | if (pdev) { | |
367 | of_node_put(node); | |
368 | break; | |
369 | } | |
d2e46790 AB |
370 | } |
371 | ||
d2e46790 AB |
372 | if (!pdev) { |
373 | pr_warn("%s: failed to find sram device!\n", __func__); | |
4a031f7d | 374 | return; |
d2e46790 AB |
375 | } |
376 | ||
73858173 | 377 | sram_pool = gen_pool_get(&pdev->dev, NULL); |
d2e46790 AB |
378 | if (!sram_pool) { |
379 | pr_warn("%s: sram pool unavailable!\n", __func__); | |
4a031f7d | 380 | return; |
d2e46790 AB |
381 | } |
382 | ||
5726a8b9 | 383 | sram_base = gen_pool_alloc(sram_pool, at91_pm_suspend_in_sram_sz); |
d2e46790 | 384 | if (!sram_base) { |
5726a8b9 | 385 | pr_warn("%s: unable to alloc sram!\n", __func__); |
4a031f7d | 386 | return; |
d2e46790 AB |
387 | } |
388 | ||
389 | sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base); | |
5726a8b9 WY |
390 | at91_suspend_sram_fn = __arm_ioremap_exec(sram_pbase, |
391 | at91_pm_suspend_in_sram_sz, false); | |
392 | if (!at91_suspend_sram_fn) { | |
d94e688c WY |
393 | pr_warn("SRAM: Could not map\n"); |
394 | return; | |
395 | } | |
396 | ||
5726a8b9 WY |
397 | /* Copy the pm suspend handler to SRAM */ |
398 | at91_suspend_sram_fn = fncpy(at91_suspend_sram_fn, | |
399 | &at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz); | |
d2e46790 | 400 | } |
d2e46790 | 401 | |
4db0ba22 | 402 | static void __init at91_pm_init(void) |
907d6deb | 403 | { |
d2e46790 | 404 | at91_pm_sram_init(); |
f5d0f457 | 405 | |
5ad945ea DL |
406 | if (at91_cpuidle_device.dev.platform_data) |
407 | platform_device_register(&at91_cpuidle_device); | |
907d6deb | 408 | |
5726a8b9 | 409 | if (at91_suspend_sram_fn) |
d94e688c WY |
410 | suspend_set_ops(&at91_pm_ops); |
411 | else | |
412 | pr_info("AT91: PM not supported, due to no SRAM allocated\n"); | |
4db0ba22 | 413 | } |
907d6deb | 414 | |
ad3fc3e3 | 415 | void __init at91rm9200_pm_init(void) |
4db0ba22 | 416 | { |
827de1f1 AB |
417 | at91_dt_ramc(); |
418 | ||
4db0ba22 AB |
419 | /* |
420 | * AT91RM9200 SDRAM low-power mode cannot be used with self-refresh. | |
421 | */ | |
d7d45f25 | 422 | at91_ramc_write(0, AT91_MC_SDRAMC_LPR, 0); |
4db0ba22 AB |
423 | |
424 | at91_pm_data.uhp_udp_mask = AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP; | |
425 | at91_pm_data.memctrl = AT91_MEMCTRL_MC; | |
426 | ||
427 | at91_pm_init(); | |
428 | } | |
429 | ||
ad3fc3e3 | 430 | void __init at91sam9260_pm_init(void) |
4db0ba22 | 431 | { |
827de1f1 | 432 | at91_dt_ramc(); |
4db0ba22 AB |
433 | at91_pm_data.memctrl = AT91_MEMCTRL_SDRAMC; |
434 | at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP; | |
435 | return at91_pm_init(); | |
436 | } | |
437 | ||
ad3fc3e3 | 438 | void __init at91sam9g45_pm_init(void) |
4db0ba22 | 439 | { |
827de1f1 | 440 | at91_dt_ramc(); |
4db0ba22 AB |
441 | at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP; |
442 | at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR; | |
443 | return at91_pm_init(); | |
907d6deb | 444 | } |
bf02280e | 445 | |
ad3fc3e3 | 446 | void __init at91sam9x5_pm_init(void) |
bf02280e | 447 | { |
827de1f1 | 448 | at91_dt_ramc(); |
bf02280e NF |
449 | at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP; |
450 | at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR; | |
451 | return at91_pm_init(); | |
452 | } |