2 * pm.c - Common OMAP2+ power management-related code
4 * Copyright (C) 2010 Texas Instruments, Inc.
5 * Copyright (C) 2010 Nokia Corporation
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
15 #include <linux/err.h>
16 #include <linux/pm_opp.h>
17 #include <linux/export.h>
18 #include <linux/suspend.h>
19 #include <linux/cpu.h>
21 #include <asm/system_misc.h>
24 #include "omap_device.h"
28 #include "prcm-common.h"
30 #include "powerdomain.h"
31 #include "clockdomain.h"
33 #include "twl-common.h"
37 * omap_pm_suspend: points to a function that does the SoC-specific
40 static int (*omap_pm_suspend)(void);
45 * struct omap2_oscillator - Describe the board main oscillator latencies
46 * @startup_time: oscillator startup latency
47 * @shutdown_time: oscillator shutdown latency
49 struct omap2_oscillator {
54 static struct omap2_oscillator oscillator = {
55 .startup_time = ULONG_MAX,
56 .shutdown_time = ULONG_MAX,
59 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
61 oscillator.startup_time = tstart;
62 oscillator.shutdown_time = tshut;
65 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
67 if (!tstart || !tshut)
70 *tstart = oscillator.startup_time;
71 *tshut = oscillator.shutdown_time;
75 static int __init _init_omap_device(char *name)
77 struct omap_hwmod *oh;
78 struct platform_device *pdev;
80 oh = omap_hwmod_lookup(name);
81 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
85 pdev = omap_device_build(oh->name, 0, oh, NULL, 0);
86 if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
94 * Build omap_devices for processors and bus.
96 static void __init omap2_init_processor_devices(void)
98 _init_omap_device("mpu");
100 _init_omap_device("iva");
102 if (cpu_is_omap44xx()) {
103 _init_omap_device("l3_main_1");
104 _init_omap_device("dsp");
105 _init_omap_device("iva");
107 _init_omap_device("l3_main");
111 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
113 /* XXX The usecount test is racy */
114 if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) &&
115 !(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING))
116 clkdm_allow_idle(clkdm);
117 else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
118 clkdm->usecount == 0)
124 * This API is to be called during init to set the various voltage
125 * domains to the voltage as per the opp table. Typically we boot up
126 * at the nominal voltage. So this function finds out the rate of
127 * the clock associated with the voltage domain, finds out the correct
128 * opp entry and sets the voltage domain to the voltage specified
131 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
134 struct voltagedomain *voltdm;
136 struct dev_pm_opp *opp;
137 unsigned long freq, bootup_volt;
140 if (!vdd_name || !clk_name || !oh_name) {
141 pr_err("%s: invalid parameters\n", __func__);
145 if (!strncmp(oh_name, "mpu", 3))
147 * All current OMAPs share voltage rail and clock
148 * source, so CPU0 is used to represent the MPU-SS.
150 dev = get_cpu_device(0);
152 dev = omap_device_get_by_hwmod_name(oh_name);
155 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
160 voltdm = voltdm_lookup(vdd_name);
162 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
167 clk = clk_get(NULL, clk_name);
169 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
173 freq = clk_get_rate(clk);
177 opp = dev_pm_opp_find_freq_ceil(dev, &freq);
180 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
185 bootup_volt = dev_pm_opp_get_voltage(opp);
188 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
193 voltdm_scale(voltdm, bootup_volt);
197 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
201 #ifdef CONFIG_SUSPEND
202 static int omap_pm_enter(suspend_state_t suspend_state)
206 if (!omap_pm_suspend)
207 return -ENOENT; /* XXX doublecheck */
209 switch (suspend_state) {
210 case PM_SUSPEND_STANDBY:
212 ret = omap_pm_suspend();
221 static int omap_pm_begin(suspend_state_t state)
223 cpu_idle_poll_ctrl(true);
224 if (cpu_is_omap34xx())
225 omap_prcm_irq_prepare();
229 static void omap_pm_end(void)
231 cpu_idle_poll_ctrl(false);
234 static void omap_pm_finish(void)
236 if (cpu_is_omap34xx())
237 omap_prcm_irq_complete();
240 static const struct platform_suspend_ops omap_pm_ops = {
241 .begin = omap_pm_begin,
243 .enter = omap_pm_enter,
244 .finish = omap_pm_finish,
245 .valid = suspend_valid_only_mem,
249 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
250 * @pm_suspend: function pointer to SoC specific suspend function
252 void omap_common_suspend_init(void *pm_suspend)
254 omap_pm_suspend = pm_suspend;
255 suspend_set_ops(&omap_pm_ops);
257 #endif /* CONFIG_SUSPEND */
259 static void __init omap3_init_voltages(void)
261 if (!cpu_is_omap34xx())
264 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
265 omap2_set_init_voltage("core", "l3_ick", "l3_main");
268 static void __init omap4_init_voltages(void)
270 if (!cpu_is_omap44xx())
273 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
274 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
275 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
278 static inline void omap_init_cpufreq(void)
280 struct platform_device_info devinfo = { };
282 if (!of_have_populated_dt())
283 devinfo.name = "omap-cpufreq";
285 devinfo.name = "cpufreq-dt";
286 platform_device_register_full(&devinfo);
289 static int __init omap2_common_pm_init(void)
291 if (!of_have_populated_dt())
292 omap2_init_processor_devices();
297 omap_postcore_initcall(omap2_common_pm_init);
299 int __init omap2_common_pm_late_init(void)
301 if (of_have_populated_dt()) {
306 /* Init the voltage layer */
307 omap_pmic_late_init();
308 omap_voltage_late_init();
310 /* Initialize the voltages */
311 omap3_init_voltages();
312 omap4_init_voltages();
314 /* Smartreflex device init */
315 omap_devinit_smartreflex();
317 /* cpufreq dummy device instantiation */