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"
36 * omap_pm_suspend: points to a function that does the SoC-specific
39 static int (*omap_pm_suspend)(void);
44 * struct omap2_oscillator - Describe the board main oscillator latencies
45 * @startup_time: oscillator startup latency
46 * @shutdown_time: oscillator shutdown latency
48 struct omap2_oscillator {
53 static struct omap2_oscillator oscillator = {
54 .startup_time = ULONG_MAX,
55 .shutdown_time = ULONG_MAX,
58 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
60 oscillator.startup_time = tstart;
61 oscillator.shutdown_time = tshut;
64 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
66 if (!tstart || !tshut)
69 *tstart = oscillator.startup_time;
70 *tshut = oscillator.shutdown_time;
74 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
76 clkdm_allow_idle(clkdm);
81 * This API is to be called during init to set the various voltage
82 * domains to the voltage as per the opp table. Typically we boot up
83 * at the nominal voltage. So this function finds out the rate of
84 * the clock associated with the voltage domain, finds out the correct
85 * opp entry and sets the voltage domain to the voltage specified
88 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
91 struct voltagedomain *voltdm;
93 struct dev_pm_opp *opp;
94 unsigned long freq, bootup_volt;
97 if (!vdd_name || !clk_name || !oh_name) {
98 pr_err("%s: invalid parameters\n", __func__);
102 if (!strncmp(oh_name, "mpu", 3))
104 * All current OMAPs share voltage rail and clock
105 * source, so CPU0 is used to represent the MPU-SS.
107 dev = get_cpu_device(0);
109 dev = omap_device_get_by_hwmod_name(oh_name);
112 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
117 voltdm = voltdm_lookup(vdd_name);
119 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
124 clk = clk_get(NULL, clk_name);
126 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
130 freq = clk_get_rate(clk);
133 opp = dev_pm_opp_find_freq_ceil(dev, &freq);
135 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
140 bootup_volt = dev_pm_opp_get_voltage(opp);
144 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
149 voltdm_scale(voltdm, bootup_volt);
153 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
157 #ifdef CONFIG_SUSPEND
158 static int omap_pm_enter(suspend_state_t suspend_state)
162 if (!omap_pm_suspend)
163 return -ENOENT; /* XXX doublecheck */
165 switch (suspend_state) {
166 case PM_SUSPEND_STANDBY:
168 ret = omap_pm_suspend();
177 static int omap_pm_begin(suspend_state_t state)
179 cpu_idle_poll_ctrl(true);
180 if (soc_is_omap34xx())
181 omap_prcm_irq_prepare();
185 static void omap_pm_end(void)
187 cpu_idle_poll_ctrl(false);
190 static void omap_pm_finish(void)
192 if (soc_is_omap34xx())
193 omap_prcm_irq_complete();
196 static const struct platform_suspend_ops omap_pm_ops = {
197 .begin = omap_pm_begin,
199 .enter = omap_pm_enter,
200 .finish = omap_pm_finish,
201 .valid = suspend_valid_only_mem,
205 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
206 * @pm_suspend: function pointer to SoC specific suspend function
208 void omap_common_suspend_init(void *pm_suspend)
210 omap_pm_suspend = pm_suspend;
211 suspend_set_ops(&omap_pm_ops);
213 #endif /* CONFIG_SUSPEND */
215 static void __init omap3_init_voltages(void)
217 if (!soc_is_omap34xx())
220 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
221 omap2_set_init_voltage("core", "l3_ick", "l3_main");
224 static void __init omap4_init_voltages(void)
226 if (!soc_is_omap44xx())
229 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
230 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
231 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
234 static int __init omap2_common_pm_init(void)
240 omap_postcore_initcall(omap2_common_pm_init);
242 int __init omap2_common_pm_late_init(void)
244 /* Init the voltage layer */
247 omap_voltage_late_init();
249 /* Initialize the voltages */
250 omap3_init_voltages();
251 omap4_init_voltages();
253 /* Smartreflex device init */
254 omap_devinit_smartreflex();