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8bd22949 KH |
1 | /* |
2 | * OMAP2 Power Management Routines | |
3 | * | |
4 | * Copyright (C) 2005 Texas Instruments, Inc. | |
5 | * Copyright (C) 2006-2008 Nokia Corporation | |
6 | * | |
7 | * Written by: | |
8 | * Richard Woodruff <r-woodruff2@ti.com> | |
9 | * Tony Lindgren | |
10 | * Juha Yrjola | |
11 | * Amit Kucheria <amit.kucheria@nokia.com> | |
12 | * Igor Stoppa <igor.stoppa@nokia.com> | |
13 | * | |
14 | * Based on pm.c for omap1 | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2 as | |
18 | * published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/suspend.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/proc_fs.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/sysfs.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/clk.h> | |
8bd22949 KH |
29 | #include <linux/irq.h> |
30 | #include <linux/time.h> | |
31 | #include <linux/gpio.h> | |
32 | ||
33 | #include <asm/mach/time.h> | |
34 | #include <asm/mach/irq.h> | |
35 | #include <asm/mach-types.h> | |
36 | ||
ce491cf8 TL |
37 | #include <plat/clock.h> |
38 | #include <plat/sram.h> | |
ce491cf8 TL |
39 | #include <plat/dma.h> |
40 | #include <plat/board.h> | |
8bd22949 | 41 | |
ee0839c2 TL |
42 | #include <mach/irqs.h> |
43 | ||
4e65331c | 44 | #include "common.h" |
59fb659b | 45 | #include "prm2xxx_3xxx.h" |
8bd22949 | 46 | #include "prm-regbits-24xx.h" |
59fb659b | 47 | #include "cm2xxx_3xxx.h" |
8bd22949 KH |
48 | #include "cm-regbits-24xx.h" |
49 | #include "sdrc.h" | |
50 | #include "pm.h" | |
4814ced5 | 51 | #include "control.h" |
72e06d08 | 52 | #include "powerdomain.h" |
1540f214 | 53 | #include "clockdomain.h" |
8bd22949 | 54 | |
e83df17f KH |
55 | #ifdef CONFIG_SUSPEND |
56 | static suspend_state_t suspend_state = PM_SUSPEND_ON; | |
57 | static inline bool is_suspending(void) | |
58 | { | |
59 | return (suspend_state != PM_SUSPEND_ON); | |
60 | } | |
61 | #else | |
62 | static inline bool is_suspending(void) | |
63 | { | |
64 | return false; | |
65 | } | |
66 | #endif | |
67 | ||
8bd22949 KH |
68 | static void (*omap2_sram_idle)(void); |
69 | static void (*omap2_sram_suspend)(u32 dllctrl, void __iomem *sdrc_dlla_ctrl, | |
70 | void __iomem *sdrc_power); | |
71 | ||
369d5614 PW |
72 | static struct powerdomain *mpu_pwrdm, *core_pwrdm; |
73 | static struct clockdomain *dsp_clkdm, *mpu_clkdm, *wkup_clkdm, *gfx_clkdm; | |
8bd22949 KH |
74 | |
75 | static struct clk *osc_ck, *emul_ck; | |
76 | ||
77 | static int omap2_fclks_active(void) | |
78 | { | |
79 | u32 f1, f2; | |
80 | ||
c4d7e58f PW |
81 | f1 = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1); |
82 | f2 = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2); | |
4af4016c | 83 | |
1e056ddd | 84 | return (f1 | f2) ? 1 : 0; |
8bd22949 KH |
85 | } |
86 | ||
8bd22949 KH |
87 | static void omap2_enter_full_retention(void) |
88 | { | |
89 | u32 l; | |
8bd22949 KH |
90 | |
91 | /* There is 1 reference hold for all children of the oscillator | |
92 | * clock, the following will remove it. If no one else uses the | |
93 | * oscillator itself it will be disabled if/when we enter retention | |
94 | * mode. | |
95 | */ | |
96 | clk_disable(osc_ck); | |
97 | ||
98 | /* Clear old wake-up events */ | |
99 | /* REVISIT: These write to reserved bits? */ | |
c4d7e58f PW |
100 | omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1); |
101 | omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2); | |
102 | omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST); | |
8bd22949 KH |
103 | |
104 | /* | |
105 | * Set MPU powerdomain's next power state to RETENTION; | |
106 | * preserve logic state during retention | |
107 | */ | |
108 | pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET); | |
109 | pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET); | |
110 | ||
111 | /* Workaround to kill USB */ | |
112 | l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) | OMAP24XX_USBSTANDBYCTRL; | |
113 | omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0); | |
114 | ||
72e06d08 | 115 | omap2_gpio_prepare_for_idle(0); |
8bd22949 | 116 | |
8bd22949 KH |
117 | /* One last check for pending IRQs to avoid extra latency due |
118 | * to sleeping unnecessarily. */ | |
94434535 | 119 | if (omap_irq_pending()) |
8bd22949 KH |
120 | goto no_sleep; |
121 | ||
122 | /* Jump to SRAM suspend code */ | |
123 | omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL), | |
124 | OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL), | |
125 | OMAP_SDRC_REGADDR(SDRC_POWER)); | |
8bd22949 | 126 | |
4af4016c | 127 | no_sleep: |
43ffcd9a | 128 | omap2_gpio_resume_after_idle(); |
8bd22949 KH |
129 | |
130 | clk_enable(osc_ck); | |
131 | ||
132 | /* clear CORE wake-up events */ | |
c4d7e58f PW |
133 | omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1); |
134 | omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2); | |
8bd22949 KH |
135 | |
136 | /* wakeup domain events - bit 1: GPT1, bit5 GPIO */ | |
c4d7e58f | 137 | omap2_prm_clear_mod_reg_bits(0x4 | 0x1, WKUP_MOD, PM_WKST); |
8bd22949 KH |
138 | |
139 | /* MPU domain wake events */ | |
c4d7e58f | 140 | l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET); |
8bd22949 | 141 | if (l & 0x01) |
c4d7e58f | 142 | omap2_prm_write_mod_reg(0x01, OCP_MOD, |
8bd22949 KH |
143 | OMAP2_PRCM_IRQSTATUS_MPU_OFFSET); |
144 | if (l & 0x20) | |
c4d7e58f | 145 | omap2_prm_write_mod_reg(0x20, OCP_MOD, |
8bd22949 KH |
146 | OMAP2_PRCM_IRQSTATUS_MPU_OFFSET); |
147 | ||
148 | /* Mask future PRCM-to-MPU interrupts */ | |
c4d7e58f | 149 | omap2_prm_write_mod_reg(0x0, OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET); |
8bd22949 KH |
150 | } |
151 | ||
152 | static int omap2_i2c_active(void) | |
153 | { | |
154 | u32 l; | |
155 | ||
c4d7e58f | 156 | l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1); |
f38ca10a | 157 | return l & (OMAP2420_EN_I2C2_MASK | OMAP2420_EN_I2C1_MASK); |
8bd22949 KH |
158 | } |
159 | ||
160 | static int sti_console_enabled; | |
161 | ||
162 | static int omap2_allow_mpu_retention(void) | |
163 | { | |
164 | u32 l; | |
165 | ||
166 | /* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */ | |
c4d7e58f | 167 | l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1); |
2fd0f75c PW |
168 | if (l & (OMAP2420_EN_MMC_MASK | OMAP24XX_EN_UART2_MASK | |
169 | OMAP24XX_EN_UART1_MASK | OMAP24XX_EN_MCSPI2_MASK | | |
170 | OMAP24XX_EN_MCSPI1_MASK | OMAP24XX_EN_DSS1_MASK)) | |
8bd22949 KH |
171 | return 0; |
172 | /* Check for UART3. */ | |
c4d7e58f | 173 | l = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2); |
2fd0f75c | 174 | if (l & OMAP24XX_EN_UART3_MASK) |
8bd22949 KH |
175 | return 0; |
176 | if (sti_console_enabled) | |
177 | return 0; | |
178 | ||
179 | return 1; | |
180 | } | |
181 | ||
182 | static void omap2_enter_mpu_retention(void) | |
183 | { | |
184 | int only_idle = 0; | |
8bd22949 KH |
185 | |
186 | /* Putting MPU into the WFI state while a transfer is active | |
187 | * seems to cause the I2C block to timeout. Why? Good question. */ | |
188 | if (omap2_i2c_active()) | |
189 | return; | |
190 | ||
191 | /* The peripherals seem not to be able to wake up the MPU when | |
192 | * it is in retention mode. */ | |
193 | if (omap2_allow_mpu_retention()) { | |
194 | /* REVISIT: These write to reserved bits? */ | |
c4d7e58f PW |
195 | omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1); |
196 | omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2); | |
197 | omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST); | |
8bd22949 KH |
198 | |
199 | /* Try to enter MPU retention */ | |
c4d7e58f | 200 | omap2_prm_write_mod_reg((0x01 << OMAP_POWERSTATE_SHIFT) | |
2fd0f75c | 201 | OMAP_LOGICRETSTATE_MASK, |
37903009 | 202 | MPU_MOD, OMAP2_PM_PWSTCTRL); |
8bd22949 KH |
203 | } else { |
204 | /* Block MPU retention */ | |
205 | ||
c4d7e58f | 206 | omap2_prm_write_mod_reg(OMAP_LOGICRETSTATE_MASK, MPU_MOD, |
37903009 | 207 | OMAP2_PM_PWSTCTRL); |
8bd22949 KH |
208 | only_idle = 1; |
209 | } | |
210 | ||
8bd22949 | 211 | omap2_sram_idle(); |
8bd22949 KH |
212 | } |
213 | ||
214 | static int omap2_can_sleep(void) | |
215 | { | |
216 | if (omap2_fclks_active()) | |
217 | return 0; | |
218 | if (osc_ck->usecount > 1) | |
219 | return 0; | |
220 | if (omap_dma_running()) | |
221 | return 0; | |
222 | ||
223 | return 1; | |
224 | } | |
225 | ||
226 | static void omap2_pm_idle(void) | |
227 | { | |
8bd22949 KH |
228 | local_fiq_disable(); |
229 | ||
230 | if (!omap2_can_sleep()) { | |
94434535 | 231 | if (omap_irq_pending()) |
8bd22949 KH |
232 | goto out; |
233 | omap2_enter_mpu_retention(); | |
234 | goto out; | |
235 | } | |
236 | ||
94434535 | 237 | if (omap_irq_pending()) |
8bd22949 KH |
238 | goto out; |
239 | ||
240 | omap2_enter_full_retention(); | |
241 | ||
242 | out: | |
243 | local_fiq_enable(); | |
8bd22949 KH |
244 | } |
245 | ||
05fad3e7 | 246 | #ifdef CONFIG_SUSPEND |
e83df17f KH |
247 | static int omap2_pm_begin(suspend_state_t state) |
248 | { | |
8bd22949 | 249 | disable_hlt(); |
c166381d | 250 | suspend_state = state; |
8bd22949 KH |
251 | return 0; |
252 | } | |
253 | ||
8bd22949 KH |
254 | static int omap2_pm_enter(suspend_state_t state) |
255 | { | |
256 | int ret = 0; | |
257 | ||
258 | switch (state) { | |
259 | case PM_SUSPEND_STANDBY: | |
260 | case PM_SUSPEND_MEM: | |
645c56a7 | 261 | omap2_enter_full_retention(); |
8bd22949 KH |
262 | break; |
263 | default: | |
264 | ret = -EINVAL; | |
265 | } | |
266 | ||
267 | return ret; | |
268 | } | |
269 | ||
e83df17f KH |
270 | static void omap2_pm_end(void) |
271 | { | |
272 | suspend_state = PM_SUSPEND_ON; | |
c166381d | 273 | enable_hlt(); |
e83df17f KH |
274 | } |
275 | ||
2f55ac07 | 276 | static const struct platform_suspend_ops omap_pm_ops = { |
e83df17f | 277 | .begin = omap2_pm_begin, |
8bd22949 | 278 | .enter = omap2_pm_enter, |
e83df17f | 279 | .end = omap2_pm_end, |
8bd22949 KH |
280 | .valid = suspend_valid_only_mem, |
281 | }; | |
05fad3e7 KH |
282 | #else |
283 | static const struct platform_suspend_ops __initdata omap_pm_ops; | |
284 | #endif /* CONFIG_SUSPEND */ | |
8bd22949 | 285 | |
369d5614 PW |
286 | /* XXX This function should be shareable between OMAP2xxx and OMAP3 */ |
287 | static int __init clkdms_setup(struct clockdomain *clkdm, void *unused) | |
8bd22949 | 288 | { |
369d5614 | 289 | if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO) |
5cd1937b | 290 | clkdm_allow_idle(clkdm); |
369d5614 PW |
291 | else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP && |
292 | atomic_read(&clkdm->usecount) == 0) | |
68b921ad | 293 | clkdm_sleep(clkdm); |
8bd22949 KH |
294 | return 0; |
295 | } | |
296 | ||
297 | static void __init prcm_setup_regs(void) | |
298 | { | |
299 | int i, num_mem_banks; | |
300 | struct powerdomain *pwrdm; | |
301 | ||
4ef70c06 PW |
302 | /* |
303 | * Enable autoidle | |
304 | * XXX This should be handled by hwmod code or PRCM init code | |
305 | */ | |
c4d7e58f | 306 | omap2_prm_write_mod_reg(OMAP24XX_AUTOIDLE_MASK, OCP_MOD, |
8bd22949 KH |
307 | OMAP2_PRCM_SYSCONFIG_OFFSET); |
308 | ||
8bd22949 KH |
309 | /* |
310 | * Set CORE powerdomain memory banks to retain their contents | |
311 | * during RETENTION | |
312 | */ | |
313 | num_mem_banks = pwrdm_get_mem_bank_count(core_pwrdm); | |
314 | for (i = 0; i < num_mem_banks; i++) | |
315 | pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET); | |
316 | ||
317 | /* Set CORE powerdomain's next power state to RETENTION */ | |
318 | pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET); | |
319 | ||
320 | /* | |
321 | * Set MPU powerdomain's next power state to RETENTION; | |
322 | * preserve logic state during retention | |
323 | */ | |
324 | pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET); | |
325 | pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET); | |
326 | ||
327 | /* Force-power down DSP, GFX powerdomains */ | |
328 | ||
329 | pwrdm = clkdm_get_pwrdm(dsp_clkdm); | |
330 | pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF); | |
68b921ad | 331 | clkdm_sleep(dsp_clkdm); |
8bd22949 KH |
332 | |
333 | pwrdm = clkdm_get_pwrdm(gfx_clkdm); | |
334 | pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF); | |
68b921ad | 335 | clkdm_sleep(gfx_clkdm); |
8bd22949 | 336 | |
51d070af | 337 | /* Enable hardware-supervised idle for all clkdms */ |
369d5614 PW |
338 | clkdm_for_each(clkdms_setup, NULL); |
339 | clkdm_add_wkdep(mpu_clkdm, wkup_clkdm); | |
8bd22949 | 340 | |
8bd22949 KH |
341 | /* REVISIT: Configure number of 32 kHz clock cycles for sys_clk |
342 | * stabilisation */ | |
c4d7e58f PW |
343 | omap2_prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD, |
344 | OMAP2_PRCM_CLKSSETUP_OFFSET); | |
8bd22949 KH |
345 | |
346 | /* Configure automatic voltage transition */ | |
c4d7e58f PW |
347 | omap2_prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD, |
348 | OMAP2_PRCM_VOLTSETUP_OFFSET); | |
349 | omap2_prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT_MASK | | |
350 | (0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) | | |
351 | OMAP24XX_MEMRETCTRL_MASK | | |
352 | (0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) | | |
353 | (0x0 << OMAP24XX_VOLT_LEVEL_SHIFT), | |
354 | OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET); | |
8bd22949 KH |
355 | |
356 | /* Enable wake-up events */ | |
c4d7e58f PW |
357 | omap2_prm_write_mod_reg(OMAP24XX_EN_GPIOS_MASK | OMAP24XX_EN_GPT1_MASK, |
358 | WKUP_MOD, PM_WKEN); | |
8bd22949 KH |
359 | } |
360 | ||
7cc515f7 | 361 | static int __init omap2_pm_init(void) |
8bd22949 KH |
362 | { |
363 | u32 l; | |
364 | ||
365 | if (!cpu_is_omap24xx()) | |
366 | return -ENODEV; | |
367 | ||
368 | printk(KERN_INFO "Power Management for OMAP2 initializing\n"); | |
c4d7e58f | 369 | l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_REVISION_OFFSET); |
8bd22949 KH |
370 | printk(KERN_INFO "PRCM revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f); |
371 | ||
369d5614 | 372 | /* Look up important powerdomains */ |
8bd22949 KH |
373 | |
374 | mpu_pwrdm = pwrdm_lookup("mpu_pwrdm"); | |
375 | if (!mpu_pwrdm) | |
376 | pr_err("PM: mpu_pwrdm not found\n"); | |
377 | ||
378 | core_pwrdm = pwrdm_lookup("core_pwrdm"); | |
379 | if (!core_pwrdm) | |
380 | pr_err("PM: core_pwrdm not found\n"); | |
381 | ||
369d5614 PW |
382 | /* Look up important clockdomains */ |
383 | ||
384 | mpu_clkdm = clkdm_lookup("mpu_clkdm"); | |
385 | if (!mpu_clkdm) | |
386 | pr_err("PM: mpu_clkdm not found\n"); | |
387 | ||
388 | wkup_clkdm = clkdm_lookup("wkup_clkdm"); | |
389 | if (!wkup_clkdm) | |
390 | pr_err("PM: wkup_clkdm not found\n"); | |
391 | ||
8bd22949 KH |
392 | dsp_clkdm = clkdm_lookup("dsp_clkdm"); |
393 | if (!dsp_clkdm) | |
369d5614 | 394 | pr_err("PM: dsp_clkdm not found\n"); |
8bd22949 KH |
395 | |
396 | gfx_clkdm = clkdm_lookup("gfx_clkdm"); | |
397 | if (!gfx_clkdm) | |
398 | pr_err("PM: gfx_clkdm not found\n"); | |
399 | ||
400 | ||
401 | osc_ck = clk_get(NULL, "osc_ck"); | |
402 | if (IS_ERR(osc_ck)) { | |
403 | printk(KERN_ERR "could not get osc_ck\n"); | |
404 | return -ENODEV; | |
405 | } | |
406 | ||
407 | if (cpu_is_omap242x()) { | |
408 | emul_ck = clk_get(NULL, "emul_ck"); | |
409 | if (IS_ERR(emul_ck)) { | |
410 | printk(KERN_ERR "could not get emul_ck\n"); | |
411 | clk_put(osc_ck); | |
412 | return -ENODEV; | |
413 | } | |
414 | } | |
415 | ||
416 | prcm_setup_regs(); | |
417 | ||
418 | /* Hack to prevent MPU retention when STI console is enabled. */ | |
419 | { | |
420 | const struct omap_sti_console_config *sti; | |
421 | ||
422 | sti = omap_get_config(OMAP_TAG_STI_CONSOLE, | |
423 | struct omap_sti_console_config); | |
424 | if (sti != NULL && sti->enable) | |
425 | sti_console_enabled = 1; | |
426 | } | |
427 | ||
428 | /* | |
429 | * We copy the assembler sleep/wakeup routines to SRAM. | |
430 | * These routines need to be in SRAM as that's the only | |
431 | * memory the MPU can see when it wakes up. | |
432 | */ | |
433 | if (cpu_is_omap24xx()) { | |
434 | omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend, | |
435 | omap24xx_idle_loop_suspend_sz); | |
436 | ||
437 | omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend, | |
438 | omap24xx_cpu_suspend_sz); | |
439 | } | |
440 | ||
441 | suspend_set_ops(&omap_pm_ops); | |
0bcd24b0 | 442 | arm_pm_idle = omap2_pm_idle; |
8bd22949 KH |
443 | |
444 | return 0; | |
445 | } | |
446 | ||
447 | late_initcall(omap2_pm_init); |