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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> | |
f5b00f6f | 28 | #include <linux/clk.h> |
ed1ebc49 | 29 | #include <linux/clk-provider.h> |
8bd22949 KH |
30 | #include <linux/irq.h> |
31 | #include <linux/time.h> | |
32 | #include <linux/gpio.h> | |
4b25408f | 33 | #include <linux/platform_data/gpio-omap.h> |
8bd22949 | 34 | |
bf027ca1 TL |
35 | #include <asm/fncpy.h> |
36 | ||
8bd22949 KH |
37 | #include <asm/mach/time.h> |
38 | #include <asm/mach/irq.h> | |
39 | #include <asm/mach-types.h> | |
9f97da78 | 40 | #include <asm/system_misc.h> |
8bd22949 | 41 | |
45c3eb7d | 42 | #include <linux/omap-dma.h> |
8bd22949 | 43 | |
e4c060db | 44 | #include "soc.h" |
4e65331c | 45 | #include "common.h" |
a135eaae | 46 | #include "clock.h" |
139563ad | 47 | #include "prm2xxx.h" |
8bd22949 | 48 | #include "prm-regbits-24xx.h" |
ff4ae5d9 | 49 | #include "cm2xxx.h" |
8bd22949 KH |
50 | #include "cm-regbits-24xx.h" |
51 | #include "sdrc.h" | |
bf027ca1 | 52 | #include "sram.h" |
8bd22949 | 53 | #include "pm.h" |
4814ced5 | 54 | #include "control.h" |
72e06d08 | 55 | #include "powerdomain.h" |
1540f214 | 56 | #include "clockdomain.h" |
8bd22949 | 57 | |
8bd22949 KH |
58 | static void (*omap2_sram_suspend)(u32 dllctrl, void __iomem *sdrc_dlla_ctrl, |
59 | void __iomem *sdrc_power); | |
60 | ||
369d5614 PW |
61 | static struct powerdomain *mpu_pwrdm, *core_pwrdm; |
62 | static struct clockdomain *dsp_clkdm, *mpu_clkdm, *wkup_clkdm, *gfx_clkdm; | |
8bd22949 KH |
63 | |
64 | static struct clk *osc_ck, *emul_ck; | |
65 | ||
1416408d | 66 | static int omap2_enter_full_retention(void) |
8bd22949 KH |
67 | { |
68 | u32 l; | |
8bd22949 KH |
69 | |
70 | /* There is 1 reference hold for all children of the oscillator | |
71 | * clock, the following will remove it. If no one else uses the | |
72 | * oscillator itself it will be disabled if/when we enter retention | |
73 | * mode. | |
74 | */ | |
75 | clk_disable(osc_ck); | |
76 | ||
77 | /* Clear old wake-up events */ | |
78 | /* REVISIT: These write to reserved bits? */ | |
9cb6d363 TK |
79 | omap_prm_clear_mod_irqs(CORE_MOD, PM_WKST1, ~0); |
80 | omap_prm_clear_mod_irqs(CORE_MOD, OMAP24XX_PM_WKST2, ~0); | |
81 | omap_prm_clear_mod_irqs(WKUP_MOD, PM_WKST, ~0); | |
8bd22949 | 82 | |
f653b298 | 83 | pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET); |
8bd22949 KH |
84 | pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET); |
85 | ||
86 | /* Workaround to kill USB */ | |
87 | l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) | OMAP24XX_USBSTANDBYCTRL; | |
88 | omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0); | |
89 | ||
72e06d08 | 90 | omap2_gpio_prepare_for_idle(0); |
8bd22949 | 91 | |
8bd22949 KH |
92 | /* One last check for pending IRQs to avoid extra latency due |
93 | * to sleeping unnecessarily. */ | |
94434535 | 94 | if (omap_irq_pending()) |
8bd22949 KH |
95 | goto no_sleep; |
96 | ||
97 | /* Jump to SRAM suspend code */ | |
98 | omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL), | |
99 | OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL), | |
100 | OMAP_SDRC_REGADDR(SDRC_POWER)); | |
8bd22949 | 101 | |
4af4016c | 102 | no_sleep: |
43ffcd9a | 103 | omap2_gpio_resume_after_idle(); |
8bd22949 KH |
104 | |
105 | clk_enable(osc_ck); | |
106 | ||
107 | /* clear CORE wake-up events */ | |
9cb6d363 TK |
108 | omap_prm_clear_mod_irqs(CORE_MOD, PM_WKST1, ~0); |
109 | omap_prm_clear_mod_irqs(CORE_MOD, OMAP24XX_PM_WKST2, ~0); | |
8bd22949 KH |
110 | |
111 | /* wakeup domain events - bit 1: GPT1, bit5 GPIO */ | |
9cb6d363 | 112 | omap_prm_clear_mod_irqs(WKUP_MOD, PM_WKST, 0x4 | 0x1); |
8bd22949 KH |
113 | |
114 | /* MPU domain wake events */ | |
9cb6d363 | 115 | omap_prm_clear_mod_irqs(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET, 0x1); |
8bd22949 | 116 | |
9cb6d363 | 117 | omap_prm_clear_mod_irqs(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET, 0x20); |
1416408d | 118 | |
f653b298 PW |
119 | pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON); |
120 | pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_ON); | |
121 | ||
1416408d | 122 | return 0; |
8bd22949 KH |
123 | } |
124 | ||
8bd22949 KH |
125 | static int sti_console_enabled; |
126 | ||
127 | static int omap2_allow_mpu_retention(void) | |
128 | { | |
cd6e9db2 | 129 | if (!omap2xxx_cm_mpu_retention_allowed()) |
8bd22949 KH |
130 | return 0; |
131 | if (sti_console_enabled) | |
132 | return 0; | |
133 | ||
134 | return 1; | |
135 | } | |
136 | ||
137 | static void omap2_enter_mpu_retention(void) | |
138 | { | |
088e8806 PW |
139 | const int zero = 0; |
140 | ||
8bd22949 KH |
141 | /* The peripherals seem not to be able to wake up the MPU when |
142 | * it is in retention mode. */ | |
143 | if (omap2_allow_mpu_retention()) { | |
144 | /* REVISIT: These write to reserved bits? */ | |
9cb6d363 TK |
145 | omap_prm_clear_mod_irqs(CORE_MOD, PM_WKST1, ~0); |
146 | omap_prm_clear_mod_irqs(CORE_MOD, OMAP24XX_PM_WKST2, ~0); | |
147 | omap_prm_clear_mod_irqs(WKUP_MOD, PM_WKST, ~0); | |
8bd22949 KH |
148 | |
149 | /* Try to enter MPU retention */ | |
f653b298 PW |
150 | pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET); |
151 | ||
8bd22949 KH |
152 | } else { |
153 | /* Block MPU retention */ | |
f653b298 | 154 | pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON); |
8bd22949 KH |
155 | } |
156 | ||
088e8806 PW |
157 | /* WFI */ |
158 | asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (zero) : "memory", "cc"); | |
f653b298 PW |
159 | |
160 | pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON); | |
8bd22949 KH |
161 | } |
162 | ||
163 | static int omap2_can_sleep(void) | |
164 | { | |
cd6e9db2 | 165 | if (omap2xxx_cm_fclks_active()) |
8bd22949 | 166 | return 0; |
ed1ebc49 | 167 | if (__clk_is_enabled(osc_ck)) |
8bd22949 KH |
168 | return 0; |
169 | if (omap_dma_running()) | |
170 | return 0; | |
171 | ||
172 | return 1; | |
173 | } | |
174 | ||
175 | static void omap2_pm_idle(void) | |
176 | { | |
8bd22949 | 177 | if (!omap2_can_sleep()) { |
94434535 | 178 | if (omap_irq_pending()) |
6b85638b | 179 | return; |
8bd22949 | 180 | omap2_enter_mpu_retention(); |
6b85638b | 181 | return; |
8bd22949 KH |
182 | } |
183 | ||
94434535 | 184 | if (omap_irq_pending()) |
6b85638b | 185 | return; |
8bd22949 KH |
186 | |
187 | omap2_enter_full_retention(); | |
8bd22949 KH |
188 | } |
189 | ||
8bd22949 KH |
190 | static void __init prcm_setup_regs(void) |
191 | { | |
192 | int i, num_mem_banks; | |
193 | struct powerdomain *pwrdm; | |
194 | ||
4ef70c06 PW |
195 | /* |
196 | * Enable autoidle | |
197 | * XXX This should be handled by hwmod code or PRCM init code | |
198 | */ | |
c4d7e58f | 199 | omap2_prm_write_mod_reg(OMAP24XX_AUTOIDLE_MASK, OCP_MOD, |
8bd22949 KH |
200 | OMAP2_PRCM_SYSCONFIG_OFFSET); |
201 | ||
8bd22949 KH |
202 | /* |
203 | * Set CORE powerdomain memory banks to retain their contents | |
204 | * during RETENTION | |
205 | */ | |
206 | num_mem_banks = pwrdm_get_mem_bank_count(core_pwrdm); | |
207 | for (i = 0; i < num_mem_banks; i++) | |
208 | pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET); | |
209 | ||
f653b298 | 210 | pwrdm_set_logic_retst(core_pwrdm, PWRDM_POWER_RET); |
8bd22949 | 211 | |
8bd22949 | 212 | pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET); |
8bd22949 KH |
213 | |
214 | /* Force-power down DSP, GFX powerdomains */ | |
215 | ||
216 | pwrdm = clkdm_get_pwrdm(dsp_clkdm); | |
217 | pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF); | |
8bd22949 KH |
218 | |
219 | pwrdm = clkdm_get_pwrdm(gfx_clkdm); | |
220 | pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF); | |
8bd22949 | 221 | |
51d070af | 222 | /* Enable hardware-supervised idle for all clkdms */ |
92206fd2 | 223 | clkdm_for_each(omap_pm_clkdms_setup, NULL); |
369d5614 | 224 | clkdm_add_wkdep(mpu_clkdm, wkup_clkdm); |
8bd22949 | 225 | |
2e4b62dc | 226 | omap_common_suspend_init(omap2_enter_full_retention); |
1416408d | 227 | |
8bd22949 KH |
228 | /* REVISIT: Configure number of 32 kHz clock cycles for sys_clk |
229 | * stabilisation */ | |
c4d7e58f PW |
230 | omap2_prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD, |
231 | OMAP2_PRCM_CLKSSETUP_OFFSET); | |
8bd22949 KH |
232 | |
233 | /* Configure automatic voltage transition */ | |
c4d7e58f PW |
234 | omap2_prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD, |
235 | OMAP2_PRCM_VOLTSETUP_OFFSET); | |
236 | omap2_prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT_MASK | | |
237 | (0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) | | |
238 | OMAP24XX_MEMRETCTRL_MASK | | |
239 | (0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) | | |
240 | (0x0 << OMAP24XX_VOLT_LEVEL_SHIFT), | |
241 | OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET); | |
8bd22949 KH |
242 | |
243 | /* Enable wake-up events */ | |
c4d7e58f PW |
244 | omap2_prm_write_mod_reg(OMAP24XX_EN_GPIOS_MASK | OMAP24XX_EN_GPT1_MASK, |
245 | WKUP_MOD, PM_WKEN); | |
944ee5dc TK |
246 | |
247 | /* Enable SYS_CLKEN control when all domains idle */ | |
248 | omap2_prm_set_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK, OMAP24XX_GR_MOD, | |
249 | OMAP2_PRCM_CLKSRC_CTRL_OFFSET); | |
8bd22949 KH |
250 | } |
251 | ||
bbd707ac | 252 | int __init omap2_pm_init(void) |
8bd22949 KH |
253 | { |
254 | u32 l; | |
255 | ||
8bd22949 | 256 | printk(KERN_INFO "Power Management for OMAP2 initializing\n"); |
c4d7e58f | 257 | l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_REVISION_OFFSET); |
8bd22949 KH |
258 | printk(KERN_INFO "PRCM revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f); |
259 | ||
369d5614 | 260 | /* Look up important powerdomains */ |
8bd22949 KH |
261 | |
262 | mpu_pwrdm = pwrdm_lookup("mpu_pwrdm"); | |
263 | if (!mpu_pwrdm) | |
264 | pr_err("PM: mpu_pwrdm not found\n"); | |
265 | ||
266 | core_pwrdm = pwrdm_lookup("core_pwrdm"); | |
267 | if (!core_pwrdm) | |
268 | pr_err("PM: core_pwrdm not found\n"); | |
269 | ||
369d5614 PW |
270 | /* Look up important clockdomains */ |
271 | ||
272 | mpu_clkdm = clkdm_lookup("mpu_clkdm"); | |
273 | if (!mpu_clkdm) | |
274 | pr_err("PM: mpu_clkdm not found\n"); | |
275 | ||
276 | wkup_clkdm = clkdm_lookup("wkup_clkdm"); | |
277 | if (!wkup_clkdm) | |
278 | pr_err("PM: wkup_clkdm not found\n"); | |
279 | ||
8bd22949 KH |
280 | dsp_clkdm = clkdm_lookup("dsp_clkdm"); |
281 | if (!dsp_clkdm) | |
369d5614 | 282 | pr_err("PM: dsp_clkdm not found\n"); |
8bd22949 KH |
283 | |
284 | gfx_clkdm = clkdm_lookup("gfx_clkdm"); | |
285 | if (!gfx_clkdm) | |
286 | pr_err("PM: gfx_clkdm not found\n"); | |
287 | ||
288 | ||
289 | osc_ck = clk_get(NULL, "osc_ck"); | |
290 | if (IS_ERR(osc_ck)) { | |
291 | printk(KERN_ERR "could not get osc_ck\n"); | |
292 | return -ENODEV; | |
293 | } | |
294 | ||
295 | if (cpu_is_omap242x()) { | |
296 | emul_ck = clk_get(NULL, "emul_ck"); | |
297 | if (IS_ERR(emul_ck)) { | |
298 | printk(KERN_ERR "could not get emul_ck\n"); | |
299 | clk_put(osc_ck); | |
300 | return -ENODEV; | |
301 | } | |
302 | } | |
303 | ||
304 | prcm_setup_regs(); | |
305 | ||
8bd22949 KH |
306 | /* |
307 | * We copy the assembler sleep/wakeup routines to SRAM. | |
308 | * These routines need to be in SRAM as that's the only | |
088e8806 PW |
309 | * memory the MPU can see when it wakes up after the entire |
310 | * chip enters idle. | |
8bd22949 | 311 | */ |
bbd707ac SG |
312 | omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend, |
313 | omap24xx_cpu_suspend_sz); | |
8bd22949 | 314 | |
0bcd24b0 | 315 | arm_pm_idle = omap2_pm_idle; |
8bd22949 KH |
316 | |
317 | return 0; | |
318 | } |