2 * OMAP2 Power Management Routines
4 * Copyright (C) 2005 Texas Instruments, Inc.
5 * Copyright (C) 2006-2008 Nokia Corporation
8 * Richard Woodruff <r-woodruff2@ti.com>
11 * Amit Kucheria <amit.kucheria@nokia.com>
12 * Igor Stoppa <igor.stoppa@nokia.com>
14 * Based on pm.c for omap1
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.
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>
30 #include <linux/irq.h>
31 #include <linux/time.h>
32 #include <linux/gpio.h>
34 #include <asm/mach/time.h>
35 #include <asm/mach/irq.h>
36 #include <asm/mach-types.h>
38 #include <mach/irqs.h>
39 #include <plat/clock.h>
40 #include <plat/sram.h>
41 #include <plat/control.h>
44 #include <plat/board.h>
47 #include "prm-regbits-24xx.h"
49 #include "cm-regbits-24xx.h"
53 #include <plat/powerdomain.h>
54 #include <plat/clockdomain.h>
56 static void (*omap2_sram_idle
)(void);
57 static void (*omap2_sram_suspend
)(u32 dllctrl
, void __iomem
*sdrc_dlla_ctrl
,
58 void __iomem
*sdrc_power
);
60 static struct powerdomain
*mpu_pwrdm
, *core_pwrdm
;
61 static struct clockdomain
*dsp_clkdm
, *mpu_clkdm
, *wkup_clkdm
, *gfx_clkdm
;
63 static struct clk
*osc_ck
, *emul_ck
;
65 static int omap2_fclks_active(void)
69 f1
= cm_read_mod_reg(CORE_MOD
, CM_FCLKEN1
);
70 f2
= cm_read_mod_reg(CORE_MOD
, OMAP24XX_CM_FCLKEN2
);
72 /* Ignore UART clocks. These are handled by UART core (serial.c) */
73 f1
&= ~(OMAP24XX_EN_UART1
| OMAP24XX_EN_UART2
);
74 f2
&= ~OMAP24XX_EN_UART3
;
81 static void omap2_enter_full_retention(void)
84 struct timespec ts_preidle
, ts_postidle
, ts_idle
;
86 /* There is 1 reference hold for all children of the oscillator
87 * clock, the following will remove it. If no one else uses the
88 * oscillator itself it will be disabled if/when we enter retention
93 /* Clear old wake-up events */
94 /* REVISIT: These write to reserved bits? */
95 prm_write_mod_reg(0xffffffff, CORE_MOD
, PM_WKST1
);
96 prm_write_mod_reg(0xffffffff, CORE_MOD
, OMAP24XX_PM_WKST2
);
97 prm_write_mod_reg(0xffffffff, WKUP_MOD
, PM_WKST
);
100 * Set MPU powerdomain's next power state to RETENTION;
101 * preserve logic state during retention
103 pwrdm_set_logic_retst(mpu_pwrdm
, PWRDM_POWER_RET
);
104 pwrdm_set_next_pwrst(mpu_pwrdm
, PWRDM_POWER_RET
);
106 /* Workaround to kill USB */
107 l
= omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0
) | OMAP24XX_USBSTANDBYCTRL
;
108 omap_ctrl_writel(l
, OMAP2_CONTROL_DEVCONF0
);
110 omap2_gpio_prepare_for_retention();
112 if (omap2_pm_debug
) {
113 omap2_pm_dump(0, 0, 0);
114 getnstimeofday(&ts_preidle
);
117 /* One last check for pending IRQs to avoid extra latency due
118 * to sleeping unnecessarily. */
119 if (omap_irq_pending())
122 omap_uart_prepare_idle(0);
123 omap_uart_prepare_idle(1);
124 omap_uart_prepare_idle(2);
126 /* Jump to SRAM suspend code */
127 omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL
),
128 OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL
),
129 OMAP_SDRC_REGADDR(SDRC_POWER
));
131 omap_uart_resume_idle(2);
132 omap_uart_resume_idle(1);
133 omap_uart_resume_idle(0);
136 if (omap2_pm_debug
) {
137 unsigned long long tmp
;
139 getnstimeofday(&ts_postidle
);
140 ts_idle
= timespec_sub(ts_postidle
, ts_preidle
);
141 tmp
= timespec_to_ns(&ts_idle
) * NSEC_PER_USEC
;
142 omap2_pm_dump(0, 1, tmp
);
144 omap2_gpio_resume_after_retention();
148 /* clear CORE wake-up events */
149 prm_write_mod_reg(0xffffffff, CORE_MOD
, PM_WKST1
);
150 prm_write_mod_reg(0xffffffff, CORE_MOD
, OMAP24XX_PM_WKST2
);
152 /* wakeup domain events - bit 1: GPT1, bit5 GPIO */
153 prm_clear_mod_reg_bits(0x4 | 0x1, WKUP_MOD
, PM_WKST
);
155 /* MPU domain wake events */
156 l
= prm_read_mod_reg(OCP_MOD
, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET
);
158 prm_write_mod_reg(0x01, OCP_MOD
,
159 OMAP2_PRCM_IRQSTATUS_MPU_OFFSET
);
161 prm_write_mod_reg(0x20, OCP_MOD
,
162 OMAP2_PRCM_IRQSTATUS_MPU_OFFSET
);
164 /* Mask future PRCM-to-MPU interrupts */
165 prm_write_mod_reg(0x0, OCP_MOD
, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET
);
168 static int omap2_i2c_active(void)
172 l
= cm_read_mod_reg(CORE_MOD
, CM_FCLKEN1
);
173 return l
& (OMAP2420_EN_I2C2
| OMAP2420_EN_I2C1
);
176 static int sti_console_enabled
;
178 static int omap2_allow_mpu_retention(void)
182 /* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */
183 l
= cm_read_mod_reg(CORE_MOD
, CM_FCLKEN1
);
184 if (l
& (OMAP2420_EN_MMC
| OMAP24XX_EN_UART2
|
185 OMAP24XX_EN_UART1
| OMAP24XX_EN_MCSPI2
|
186 OMAP24XX_EN_MCSPI1
| OMAP24XX_EN_DSS1
))
188 /* Check for UART3. */
189 l
= cm_read_mod_reg(CORE_MOD
, OMAP24XX_CM_FCLKEN2
);
190 if (l
& OMAP24XX_EN_UART3
)
192 if (sti_console_enabled
)
198 static void omap2_enter_mpu_retention(void)
201 struct timespec ts_preidle
, ts_postidle
, ts_idle
;
203 /* Putting MPU into the WFI state while a transfer is active
204 * seems to cause the I2C block to timeout. Why? Good question. */
205 if (omap2_i2c_active())
208 /* The peripherals seem not to be able to wake up the MPU when
209 * it is in retention mode. */
210 if (omap2_allow_mpu_retention()) {
211 /* REVISIT: These write to reserved bits? */
212 prm_write_mod_reg(0xffffffff, CORE_MOD
, PM_WKST1
);
213 prm_write_mod_reg(0xffffffff, CORE_MOD
, OMAP24XX_PM_WKST2
);
214 prm_write_mod_reg(0xffffffff, WKUP_MOD
, PM_WKST
);
216 /* Try to enter MPU retention */
217 prm_write_mod_reg((0x01 << OMAP_POWERSTATE_SHIFT
) |
219 MPU_MOD
, OMAP2_PM_PWSTCTRL
);
221 /* Block MPU retention */
223 prm_write_mod_reg(OMAP_LOGICRETSTATE
, MPU_MOD
,
228 if (omap2_pm_debug
) {
229 omap2_pm_dump(only_idle
? 2 : 1, 0, 0);
230 getnstimeofday(&ts_preidle
);
235 if (omap2_pm_debug
) {
236 unsigned long long tmp
;
238 getnstimeofday(&ts_postidle
);
239 ts_idle
= timespec_sub(ts_postidle
, ts_preidle
);
240 tmp
= timespec_to_ns(&ts_idle
) * NSEC_PER_USEC
;
241 omap2_pm_dump(only_idle
? 2 : 1, 1, tmp
);
245 static int omap2_can_sleep(void)
247 if (omap2_fclks_active())
249 if (osc_ck
->usecount
> 1)
251 if (omap_dma_running())
257 static void omap2_pm_idle(void)
262 if (!omap2_can_sleep()) {
263 if (omap_irq_pending())
265 omap2_enter_mpu_retention();
269 if (omap_irq_pending())
272 omap2_enter_full_retention();
279 static int omap2_pm_prepare(void)
281 /* We cannot sleep in idle until we have resumed */
286 static int omap2_pm_suspend(void)
290 wken_wkup
= prm_read_mod_reg(WKUP_MOD
, PM_WKEN
);
291 prm_write_mod_reg(wken_wkup
& ~OMAP24XX_EN_GPT1
, WKUP_MOD
, PM_WKEN
);
294 mir1
= omap_readl(0x480fe0a4);
295 omap_writel(1 << 5, 0x480fe0ac);
297 omap_uart_prepare_suspend();
298 omap2_enter_full_retention();
300 omap_writel(mir1
, 0x480fe0a4);
301 prm_write_mod_reg(wken_wkup
, WKUP_MOD
, PM_WKEN
);
306 static int omap2_pm_enter(suspend_state_t state
)
311 case PM_SUSPEND_STANDBY
:
313 ret
= omap2_pm_suspend();
322 static void omap2_pm_finish(void)
327 static struct platform_suspend_ops omap_pm_ops
= {
328 .prepare
= omap2_pm_prepare
,
329 .enter
= omap2_pm_enter
,
330 .finish
= omap2_pm_finish
,
331 .valid
= suspend_valid_only_mem
,
334 /* XXX This function should be shareable between OMAP2xxx and OMAP3 */
335 static int __init
clkdms_setup(struct clockdomain
*clkdm
, void *unused
)
337 clkdm_clear_all_wkdeps(clkdm
);
338 clkdm_clear_all_sleepdeps(clkdm
);
340 if (clkdm
->flags
& CLKDM_CAN_ENABLE_AUTO
)
341 omap2_clkdm_allow_idle(clkdm
);
342 else if (clkdm
->flags
& CLKDM_CAN_FORCE_SLEEP
&&
343 atomic_read(&clkdm
->usecount
) == 0)
344 omap2_clkdm_sleep(clkdm
);
348 static void __init
prcm_setup_regs(void)
350 int i
, num_mem_banks
;
351 struct powerdomain
*pwrdm
;
353 /* Enable autoidle */
354 prm_write_mod_reg(OMAP24XX_AUTOIDLE
, OCP_MOD
,
355 OMAP2_PRCM_SYSCONFIG_OFFSET
);
358 * Set CORE powerdomain memory banks to retain their contents
361 num_mem_banks
= pwrdm_get_mem_bank_count(core_pwrdm
);
362 for (i
= 0; i
< num_mem_banks
; i
++)
363 pwrdm_set_mem_retst(core_pwrdm
, i
, PWRDM_POWER_RET
);
365 /* Set CORE powerdomain's next power state to RETENTION */
366 pwrdm_set_next_pwrst(core_pwrdm
, PWRDM_POWER_RET
);
369 * Set MPU powerdomain's next power state to RETENTION;
370 * preserve logic state during retention
372 pwrdm_set_logic_retst(mpu_pwrdm
, PWRDM_POWER_RET
);
373 pwrdm_set_next_pwrst(mpu_pwrdm
, PWRDM_POWER_RET
);
375 /* Force-power down DSP, GFX powerdomains */
377 pwrdm
= clkdm_get_pwrdm(dsp_clkdm
);
378 pwrdm_set_next_pwrst(pwrdm
, PWRDM_POWER_OFF
);
379 omap2_clkdm_sleep(dsp_clkdm
);
381 pwrdm
= clkdm_get_pwrdm(gfx_clkdm
);
382 pwrdm_set_next_pwrst(pwrdm
, PWRDM_POWER_OFF
);
383 omap2_clkdm_sleep(gfx_clkdm
);
386 * Clear clockdomain wakeup dependencies and enable
387 * hardware-supervised idle for all clkdms
389 clkdm_for_each(clkdms_setup
, NULL
);
390 clkdm_add_wkdep(mpu_clkdm
, wkup_clkdm
);
392 /* Enable clock autoidle for all domains */
393 cm_write_mod_reg(OMAP24XX_AUTO_CAM
|
394 OMAP24XX_AUTO_MAILBOXES
|
397 OMAP24XX_AUTO_MSPRO
|
402 OMAP24XX_AUTO_UART2
|
403 OMAP24XX_AUTO_UART1
|
406 OMAP24XX_AUTO_MCSPI2
|
407 OMAP24XX_AUTO_MCSPI1
|
408 OMAP24XX_AUTO_MCBSP2
|
409 OMAP24XX_AUTO_MCBSP1
|
410 OMAP24XX_AUTO_GPT12
|
411 OMAP24XX_AUTO_GPT11
|
412 OMAP24XX_AUTO_GPT10
|
421 OMAP2420_AUTO_VLYNQ
|
423 CORE_MOD
, CM_AUTOIDLE1
);
424 cm_write_mod_reg(OMAP24XX_AUTO_UART3
|
427 CORE_MOD
, CM_AUTOIDLE2
);
428 cm_write_mod_reg(OMAP24XX_AUTO_SDRC
|
431 CORE_MOD
, CM_AUTOIDLE3
);
432 cm_write_mod_reg(OMAP24XX_AUTO_PKA
|
437 CORE_MOD
, OMAP24XX_CM_AUTOIDLE4
);
439 cm_write_mod_reg(OMAP2420_AUTO_DSP_IPI
, OMAP24XX_DSP_MOD
, CM_AUTOIDLE
);
441 /* Put DPLL and both APLLs into autoidle mode */
442 cm_write_mod_reg((0x03 << OMAP24XX_AUTO_DPLL_SHIFT
) |
443 (0x03 << OMAP24XX_AUTO_96M_SHIFT
) |
444 (0x03 << OMAP24XX_AUTO_54M_SHIFT
),
445 PLL_MOD
, CM_AUTOIDLE
);
447 cm_write_mod_reg(OMAP24XX_AUTO_OMAPCTRL
|
449 OMAP24XX_AUTO_MPU_WDT
|
450 OMAP24XX_AUTO_GPIOS
|
451 OMAP24XX_AUTO_32KSYNC
|
453 WKUP_MOD
, CM_AUTOIDLE
);
455 /* REVISIT: Configure number of 32 kHz clock cycles for sys_clk
457 prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT
, OMAP24XX_GR_MOD
,
458 OMAP2_PRCM_CLKSSETUP_OFFSET
);
460 /* Configure automatic voltage transition */
461 prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT
, OMAP24XX_GR_MOD
,
462 OMAP2_PRCM_VOLTSETUP_OFFSET
);
463 prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT
|
464 (0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT
) |
465 OMAP24XX_MEMRETCTRL
|
466 (0x1 << OMAP24XX_SETRET_LEVEL_SHIFT
) |
467 (0x0 << OMAP24XX_VOLT_LEVEL_SHIFT
),
468 OMAP24XX_GR_MOD
, OMAP2_PRCM_VOLTCTRL_OFFSET
);
470 /* Enable wake-up events */
471 prm_write_mod_reg(OMAP24XX_EN_GPIOS
| OMAP24XX_EN_GPT1
,
475 static int __init
omap2_pm_init(void)
479 if (!cpu_is_omap24xx())
482 printk(KERN_INFO
"Power Management for OMAP2 initializing\n");
483 l
= prm_read_mod_reg(OCP_MOD
, OMAP2_PRCM_REVISION_OFFSET
);
484 printk(KERN_INFO
"PRCM revision %d.%d\n", (l
>> 4) & 0x0f, l
& 0x0f);
486 /* Look up important powerdomains */
488 mpu_pwrdm
= pwrdm_lookup("mpu_pwrdm");
490 pr_err("PM: mpu_pwrdm not found\n");
492 core_pwrdm
= pwrdm_lookup("core_pwrdm");
494 pr_err("PM: core_pwrdm not found\n");
496 /* Look up important clockdomains */
498 mpu_clkdm
= clkdm_lookup("mpu_clkdm");
500 pr_err("PM: mpu_clkdm not found\n");
502 wkup_clkdm
= clkdm_lookup("wkup_clkdm");
504 pr_err("PM: wkup_clkdm not found\n");
506 dsp_clkdm
= clkdm_lookup("dsp_clkdm");
508 pr_err("PM: dsp_clkdm not found\n");
510 gfx_clkdm
= clkdm_lookup("gfx_clkdm");
512 pr_err("PM: gfx_clkdm not found\n");
515 osc_ck
= clk_get(NULL
, "osc_ck");
516 if (IS_ERR(osc_ck
)) {
517 printk(KERN_ERR
"could not get osc_ck\n");
521 if (cpu_is_omap242x()) {
522 emul_ck
= clk_get(NULL
, "emul_ck");
523 if (IS_ERR(emul_ck
)) {
524 printk(KERN_ERR
"could not get emul_ck\n");
532 /* Hack to prevent MPU retention when STI console is enabled. */
534 const struct omap_sti_console_config
*sti
;
536 sti
= omap_get_config(OMAP_TAG_STI_CONSOLE
,
537 struct omap_sti_console_config
);
538 if (sti
!= NULL
&& sti
->enable
)
539 sti_console_enabled
= 1;
543 * We copy the assembler sleep/wakeup routines to SRAM.
544 * These routines need to be in SRAM as that's the only
545 * memory the MPU can see when it wakes up.
547 if (cpu_is_omap24xx()) {
548 omap2_sram_idle
= omap_sram_push(omap24xx_idle_loop_suspend
,
549 omap24xx_idle_loop_suspend_sz
);
551 omap2_sram_suspend
= omap_sram_push(omap24xx_cpu_suspend
,
552 omap24xx_cpu_suspend_sz
);
555 suspend_set_ops(&omap_pm_ops
);
556 pm_idle
= omap2_pm_idle
;
561 late_initcall(omap2_pm_init
);