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>
29 #include <linux/irq.h>
30 #include <linux/time.h>
31 #include <linux/gpio.h>
33 #include <asm/mach/time.h>
34 #include <asm/mach/irq.h>
35 #include <asm/mach-types.h>
36 #include <asm/system_misc.h>
38 #include <plat/clock.h>
39 #include <plat/sram.h>
42 #include <mach/irqs.h>
45 #include "prm2xxx_3xxx.h"
46 #include "prm-regbits-24xx.h"
47 #include "cm2xxx_3xxx.h"
48 #include "cm-regbits-24xx.h"
52 #include "powerdomain.h"
53 #include "clockdomain.h"
55 static void (*omap2_sram_idle
)(void);
56 static void (*omap2_sram_suspend
)(u32 dllctrl
, void __iomem
*sdrc_dlla_ctrl
,
57 void __iomem
*sdrc_power
);
59 static struct powerdomain
*mpu_pwrdm
, *core_pwrdm
;
60 static struct clockdomain
*dsp_clkdm
, *mpu_clkdm
, *wkup_clkdm
, *gfx_clkdm
;
62 static struct clk
*osc_ck
, *emul_ck
;
64 static int omap2_fclks_active(void)
68 f1
= omap2_cm_read_mod_reg(CORE_MOD
, CM_FCLKEN1
);
69 f2
= omap2_cm_read_mod_reg(CORE_MOD
, OMAP24XX_CM_FCLKEN2
);
71 return (f1
| f2
) ? 1 : 0;
74 static int omap2_enter_full_retention(void)
78 /* There is 1 reference hold for all children of the oscillator
79 * clock, the following will remove it. If no one else uses the
80 * oscillator itself it will be disabled if/when we enter retention
85 /* Clear old wake-up events */
86 /* REVISIT: These write to reserved bits? */
87 omap2_prm_write_mod_reg(0xffffffff, CORE_MOD
, PM_WKST1
);
88 omap2_prm_write_mod_reg(0xffffffff, CORE_MOD
, OMAP24XX_PM_WKST2
);
89 omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD
, PM_WKST
);
92 * Set MPU powerdomain's next power state to RETENTION;
93 * preserve logic state during retention
95 pwrdm_set_logic_retst(mpu_pwrdm
, PWRDM_POWER_RET
);
96 pwrdm_set_next_pwrst(mpu_pwrdm
, PWRDM_POWER_RET
);
98 /* Workaround to kill USB */
99 l
= omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0
) | OMAP24XX_USBSTANDBYCTRL
;
100 omap_ctrl_writel(l
, OMAP2_CONTROL_DEVCONF0
);
102 omap2_gpio_prepare_for_idle(0);
104 /* One last check for pending IRQs to avoid extra latency due
105 * to sleeping unnecessarily. */
106 if (omap_irq_pending())
109 /* Jump to SRAM suspend code */
110 omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL
),
111 OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL
),
112 OMAP_SDRC_REGADDR(SDRC_POWER
));
115 omap2_gpio_resume_after_idle();
119 /* clear CORE wake-up events */
120 omap2_prm_write_mod_reg(0xffffffff, CORE_MOD
, PM_WKST1
);
121 omap2_prm_write_mod_reg(0xffffffff, CORE_MOD
, OMAP24XX_PM_WKST2
);
123 /* wakeup domain events - bit 1: GPT1, bit5 GPIO */
124 omap2_prm_clear_mod_reg_bits(0x4 | 0x1, WKUP_MOD
, PM_WKST
);
126 /* MPU domain wake events */
127 l
= omap2_prm_read_mod_reg(OCP_MOD
, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET
);
129 omap2_prm_write_mod_reg(0x01, OCP_MOD
,
130 OMAP2_PRCM_IRQSTATUS_MPU_OFFSET
);
132 omap2_prm_write_mod_reg(0x20, OCP_MOD
,
133 OMAP2_PRCM_IRQSTATUS_MPU_OFFSET
);
135 /* Mask future PRCM-to-MPU interrupts */
136 omap2_prm_write_mod_reg(0x0, OCP_MOD
, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET
);
141 static int omap2_i2c_active(void)
145 l
= omap2_cm_read_mod_reg(CORE_MOD
, CM_FCLKEN1
);
146 return l
& (OMAP2420_EN_I2C2_MASK
| OMAP2420_EN_I2C1_MASK
);
149 static int sti_console_enabled
;
151 static int omap2_allow_mpu_retention(void)
155 /* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */
156 l
= omap2_cm_read_mod_reg(CORE_MOD
, CM_FCLKEN1
);
157 if (l
& (OMAP2420_EN_MMC_MASK
| OMAP24XX_EN_UART2_MASK
|
158 OMAP24XX_EN_UART1_MASK
| OMAP24XX_EN_MCSPI2_MASK
|
159 OMAP24XX_EN_MCSPI1_MASK
| OMAP24XX_EN_DSS1_MASK
))
161 /* Check for UART3. */
162 l
= omap2_cm_read_mod_reg(CORE_MOD
, OMAP24XX_CM_FCLKEN2
);
163 if (l
& OMAP24XX_EN_UART3_MASK
)
165 if (sti_console_enabled
)
171 static void omap2_enter_mpu_retention(void)
173 /* Putting MPU into the WFI state while a transfer is active
174 * seems to cause the I2C block to timeout. Why? Good question. */
175 if (omap2_i2c_active())
178 /* The peripherals seem not to be able to wake up the MPU when
179 * it is in retention mode. */
180 if (omap2_allow_mpu_retention()) {
181 /* REVISIT: These write to reserved bits? */
182 omap2_prm_write_mod_reg(0xffffffff, CORE_MOD
, PM_WKST1
);
183 omap2_prm_write_mod_reg(0xffffffff, CORE_MOD
, OMAP24XX_PM_WKST2
);
184 omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD
, PM_WKST
);
186 /* Try to enter MPU retention */
187 omap2_prm_write_mod_reg((0x01 << OMAP_POWERSTATE_SHIFT
) |
188 OMAP_LOGICRETSTATE_MASK
,
189 MPU_MOD
, OMAP2_PM_PWSTCTRL
);
191 /* Block MPU retention */
193 omap2_prm_write_mod_reg(OMAP_LOGICRETSTATE_MASK
, MPU_MOD
,
200 static int omap2_can_sleep(void)
202 if (omap2_fclks_active())
204 if (osc_ck
->usecount
> 1)
206 if (omap_dma_running())
212 static void omap2_pm_idle(void)
216 if (!omap2_can_sleep()) {
217 if (omap_irq_pending())
219 omap2_enter_mpu_retention();
223 if (omap_irq_pending())
226 omap2_enter_full_retention();
232 static void __init
prcm_setup_regs(void)
234 int i
, num_mem_banks
;
235 struct powerdomain
*pwrdm
;
239 * XXX This should be handled by hwmod code or PRCM init code
241 omap2_prm_write_mod_reg(OMAP24XX_AUTOIDLE_MASK
, OCP_MOD
,
242 OMAP2_PRCM_SYSCONFIG_OFFSET
);
245 * Set CORE powerdomain memory banks to retain their contents
248 num_mem_banks
= pwrdm_get_mem_bank_count(core_pwrdm
);
249 for (i
= 0; i
< num_mem_banks
; i
++)
250 pwrdm_set_mem_retst(core_pwrdm
, i
, PWRDM_POWER_RET
);
252 /* Set CORE powerdomain's next power state to RETENTION */
253 pwrdm_set_next_pwrst(core_pwrdm
, PWRDM_POWER_RET
);
256 * Set MPU powerdomain's next power state to RETENTION;
257 * preserve logic state during retention
259 pwrdm_set_logic_retst(mpu_pwrdm
, PWRDM_POWER_RET
);
260 pwrdm_set_next_pwrst(mpu_pwrdm
, PWRDM_POWER_RET
);
262 /* Force-power down DSP, GFX powerdomains */
264 pwrdm
= clkdm_get_pwrdm(dsp_clkdm
);
265 pwrdm_set_next_pwrst(pwrdm
, PWRDM_POWER_OFF
);
266 clkdm_sleep(dsp_clkdm
);
268 pwrdm
= clkdm_get_pwrdm(gfx_clkdm
);
269 pwrdm_set_next_pwrst(pwrdm
, PWRDM_POWER_OFF
);
270 clkdm_sleep(gfx_clkdm
);
272 /* Enable hardware-supervised idle for all clkdms */
273 clkdm_for_each(omap_pm_clkdms_setup
, NULL
);
274 clkdm_add_wkdep(mpu_clkdm
, wkup_clkdm
);
276 #ifdef CONFIG_SUSPEND
277 omap_pm_suspend
= omap2_enter_full_retention
;
280 /* REVISIT: Configure number of 32 kHz clock cycles for sys_clk
282 omap2_prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT
, OMAP24XX_GR_MOD
,
283 OMAP2_PRCM_CLKSSETUP_OFFSET
);
285 /* Configure automatic voltage transition */
286 omap2_prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT
, OMAP24XX_GR_MOD
,
287 OMAP2_PRCM_VOLTSETUP_OFFSET
);
288 omap2_prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT_MASK
|
289 (0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT
) |
290 OMAP24XX_MEMRETCTRL_MASK
|
291 (0x1 << OMAP24XX_SETRET_LEVEL_SHIFT
) |
292 (0x0 << OMAP24XX_VOLT_LEVEL_SHIFT
),
293 OMAP24XX_GR_MOD
, OMAP2_PRCM_VOLTCTRL_OFFSET
);
295 /* Enable wake-up events */
296 omap2_prm_write_mod_reg(OMAP24XX_EN_GPIOS_MASK
| OMAP24XX_EN_GPT1_MASK
,
300 int __init
omap2_pm_init(void)
304 printk(KERN_INFO
"Power Management for OMAP2 initializing\n");
305 l
= omap2_prm_read_mod_reg(OCP_MOD
, OMAP2_PRCM_REVISION_OFFSET
);
306 printk(KERN_INFO
"PRCM revision %d.%d\n", (l
>> 4) & 0x0f, l
& 0x0f);
308 /* Look up important powerdomains */
310 mpu_pwrdm
= pwrdm_lookup("mpu_pwrdm");
312 pr_err("PM: mpu_pwrdm not found\n");
314 core_pwrdm
= pwrdm_lookup("core_pwrdm");
316 pr_err("PM: core_pwrdm not found\n");
318 /* Look up important clockdomains */
320 mpu_clkdm
= clkdm_lookup("mpu_clkdm");
322 pr_err("PM: mpu_clkdm not found\n");
324 wkup_clkdm
= clkdm_lookup("wkup_clkdm");
326 pr_err("PM: wkup_clkdm not found\n");
328 dsp_clkdm
= clkdm_lookup("dsp_clkdm");
330 pr_err("PM: dsp_clkdm not found\n");
332 gfx_clkdm
= clkdm_lookup("gfx_clkdm");
334 pr_err("PM: gfx_clkdm not found\n");
337 osc_ck
= clk_get(NULL
, "osc_ck");
338 if (IS_ERR(osc_ck
)) {
339 printk(KERN_ERR
"could not get osc_ck\n");
343 if (cpu_is_omap242x()) {
344 emul_ck
= clk_get(NULL
, "emul_ck");
345 if (IS_ERR(emul_ck
)) {
346 printk(KERN_ERR
"could not get emul_ck\n");
355 * We copy the assembler sleep/wakeup routines to SRAM.
356 * These routines need to be in SRAM as that's the only
357 * memory the MPU can see when it wakes up.
359 omap2_sram_idle
= omap_sram_push(omap24xx_idle_loop_suspend
,
360 omap24xx_idle_loop_suspend_sz
);
362 omap2_sram_suspend
= omap_sram_push(omap24xx_cpu_suspend
,
363 omap24xx_cpu_suspend_sz
);
365 arm_pm_idle
= omap2_pm_idle
;