1 // SPDX-License-Identifier: GPL-2.0-only
3 * pm.c - Common OMAP2+ power management-related code
5 * Copyright (C) 2010 Texas Instruments, Inc.
6 * Copyright (C) 2010 Nokia Corporation
9 #include <linux/kernel.h>
10 #include <linux/init.h>
12 #include <linux/err.h>
13 #include <linux/pm_opp.h>
14 #include <linux/export.h>
15 #include <linux/suspend.h>
16 #include <linux/clk.h>
17 #include <linux/cpu.h>
19 #include <asm/system_misc.h>
21 #include "omap_device.h"
25 #include "prcm-common.h"
27 #include "powerdomain.h"
28 #include "clockdomain.h"
33 * omap_pm_suspend: points to a function that does the SoC-specific
36 static int (*omap_pm_suspend)(void);
41 * struct omap2_oscillator - Describe the board main oscillator latencies
42 * @startup_time: oscillator startup latency
43 * @shutdown_time: oscillator shutdown latency
45 struct omap2_oscillator {
50 static struct omap2_oscillator oscillator = {
51 .startup_time = ULONG_MAX,
52 .shutdown_time = ULONG_MAX,
55 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
57 oscillator.startup_time = tstart;
58 oscillator.shutdown_time = tshut;
61 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
63 if (!tstart || !tshut)
66 *tstart = oscillator.startup_time;
67 *tshut = oscillator.shutdown_time;
71 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
73 clkdm_allow_idle(clkdm);
78 * This API is to be called during init to set the various voltage
79 * domains to the voltage as per the opp table. Typically we boot up
80 * at the nominal voltage. So this function finds out the rate of
81 * the clock associated with the voltage domain, finds out the correct
82 * opp entry and sets the voltage domain to the voltage specified
85 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
88 struct voltagedomain *voltdm;
90 struct dev_pm_opp *opp;
91 unsigned long freq, bootup_volt;
94 if (!vdd_name || !clk_name || !oh_name) {
95 pr_err("%s: invalid parameters\n", __func__);
99 if (!strncmp(oh_name, "mpu", 3))
101 * All current OMAPs share voltage rail and clock
102 * source, so CPU0 is used to represent the MPU-SS.
104 dev = get_cpu_device(0);
106 dev = omap_device_get_by_hwmod_name(oh_name);
109 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
114 voltdm = voltdm_lookup(vdd_name);
116 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
121 clk = clk_get(NULL, clk_name);
123 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
127 freq = clk_get_rate(clk);
130 opp = dev_pm_opp_find_freq_ceil(dev, &freq);
132 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
137 bootup_volt = dev_pm_opp_get_voltage(opp);
141 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
146 voltdm_scale(voltdm, bootup_volt);
150 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
154 #ifdef CONFIG_SUSPEND
155 static int omap_pm_enter(suspend_state_t suspend_state)
159 if (!omap_pm_suspend)
160 return -ENOENT; /* XXX doublecheck */
162 switch (suspend_state) {
164 ret = omap_pm_suspend();
173 static int omap_pm_begin(suspend_state_t state)
175 cpu_idle_poll_ctrl(true);
176 if (soc_is_omap34xx())
177 omap_prcm_irq_prepare();
181 static void omap_pm_end(void)
183 cpu_idle_poll_ctrl(false);
186 static void omap_pm_wake(void)
188 if (soc_is_omap34xx())
189 omap_prcm_irq_complete();
192 static const struct platform_suspend_ops omap_pm_ops = {
193 .begin = omap_pm_begin,
195 .enter = omap_pm_enter,
196 .wake = omap_pm_wake,
197 .valid = suspend_valid_only_mem,
201 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
202 * @pm_suspend: function pointer to SoC specific suspend function
204 void omap_common_suspend_init(void *pm_suspend)
206 omap_pm_suspend = pm_suspend;
207 suspend_set_ops(&omap_pm_ops);
209 #endif /* CONFIG_SUSPEND */
211 static void __init omap3_init_voltages(void)
213 if (!soc_is_omap34xx())
216 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
217 omap2_set_init_voltage("core", "l3_ick", "l3_main");
220 static void __init omap4_init_voltages(void)
222 if (!soc_is_omap44xx())
225 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
226 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
227 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
230 int __maybe_unused omap_pm_nop_init(void)
235 int (*omap_pm_soc_init)(void);
237 int __init omap2_common_pm_late_init(void)
241 if (!omap_pm_soc_init)
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();
256 error = omap_pm_soc_init();
258 pr_warn("%s: pm soc init failed: %i\n", __func__, error);
260 omap2_clk_enable_autoidle_all();
264 omap_late_initcall(omap2_common_pm_late_init);