Merge tag 'arc-5.2-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
[linux-2.6-microblaze.git] / arch / arm / mach-omap2 / pm.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * pm.c - Common OMAP2+ power management-related code
4  *
5  * Copyright (C) 2010 Texas Instruments, Inc.
6  * Copyright (C) 2010 Nokia Corporation
7  */
8
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/io.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>
18
19 #include <asm/system_misc.h>
20
21 #include "omap_device.h"
22 #include "common.h"
23
24 #include "soc.h"
25 #include "prcm-common.h"
26 #include "voltage.h"
27 #include "powerdomain.h"
28 #include "clockdomain.h"
29 #include "pm.h"
30
31 #ifdef CONFIG_SUSPEND
32 /*
33  * omap_pm_suspend: points to a function that does the SoC-specific
34  * suspend work
35  */
36 static int (*omap_pm_suspend)(void);
37 #endif
38
39 #ifdef CONFIG_PM
40 /**
41  * struct omap2_oscillator - Describe the board main oscillator latencies
42  * @startup_time: oscillator startup latency
43  * @shutdown_time: oscillator shutdown latency
44  */
45 struct omap2_oscillator {
46         u32 startup_time;
47         u32 shutdown_time;
48 };
49
50 static struct omap2_oscillator oscillator = {
51         .startup_time = ULONG_MAX,
52         .shutdown_time = ULONG_MAX,
53 };
54
55 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
56 {
57         oscillator.startup_time = tstart;
58         oscillator.shutdown_time = tshut;
59 }
60
61 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
62 {
63         if (!tstart || !tshut)
64                 return;
65
66         *tstart = oscillator.startup_time;
67         *tshut = oscillator.shutdown_time;
68 }
69 #endif
70
71 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
72 {
73         clkdm_allow_idle(clkdm);
74         return 0;
75 }
76
77 /*
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
83  * in the opp entry
84  */
85 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
86                                          const char *oh_name)
87 {
88         struct voltagedomain *voltdm;
89         struct clk *clk;
90         struct dev_pm_opp *opp;
91         unsigned long freq, bootup_volt;
92         struct device *dev;
93
94         if (!vdd_name || !clk_name || !oh_name) {
95                 pr_err("%s: invalid parameters\n", __func__);
96                 goto exit;
97         }
98
99         if (!strncmp(oh_name, "mpu", 3))
100                 /* 
101                  * All current OMAPs share voltage rail and clock
102                  * source, so CPU0 is used to represent the MPU-SS.
103                  */
104                 dev = get_cpu_device(0);
105         else
106                 dev = omap_device_get_by_hwmod_name(oh_name);
107
108         if (IS_ERR(dev)) {
109                 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
110                         __func__, oh_name);
111                 goto exit;
112         }
113
114         voltdm = voltdm_lookup(vdd_name);
115         if (!voltdm) {
116                 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
117                         __func__, vdd_name);
118                 goto exit;
119         }
120
121         clk =  clk_get(NULL, clk_name);
122         if (IS_ERR(clk)) {
123                 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
124                 goto exit;
125         }
126
127         freq = clk_get_rate(clk);
128         clk_put(clk);
129
130         opp = dev_pm_opp_find_freq_ceil(dev, &freq);
131         if (IS_ERR(opp)) {
132                 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
133                         __func__, vdd_name);
134                 goto exit;
135         }
136
137         bootup_volt = dev_pm_opp_get_voltage(opp);
138         dev_pm_opp_put(opp);
139
140         if (!bootup_volt) {
141                 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
142                        __func__, vdd_name);
143                 goto exit;
144         }
145
146         voltdm_scale(voltdm, bootup_volt);
147         return 0;
148
149 exit:
150         pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
151         return -EINVAL;
152 }
153
154 #ifdef CONFIG_SUSPEND
155 static int omap_pm_enter(suspend_state_t suspend_state)
156 {
157         int ret = 0;
158
159         if (!omap_pm_suspend)
160                 return -ENOENT; /* XXX doublecheck */
161
162         switch (suspend_state) {
163         case PM_SUSPEND_MEM:
164                 ret = omap_pm_suspend();
165                 break;
166         default:
167                 ret = -EINVAL;
168         }
169
170         return ret;
171 }
172
173 static int omap_pm_begin(suspend_state_t state)
174 {
175         cpu_idle_poll_ctrl(true);
176         if (soc_is_omap34xx())
177                 omap_prcm_irq_prepare();
178         return 0;
179 }
180
181 static void omap_pm_end(void)
182 {
183         cpu_idle_poll_ctrl(false);
184 }
185
186 static void omap_pm_wake(void)
187 {
188         if (soc_is_omap34xx())
189                 omap_prcm_irq_complete();
190 }
191
192 static const struct platform_suspend_ops omap_pm_ops = {
193         .begin          = omap_pm_begin,
194         .end            = omap_pm_end,
195         .enter          = omap_pm_enter,
196         .wake           = omap_pm_wake,
197         .valid          = suspend_valid_only_mem,
198 };
199
200 /**
201  * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
202  * @pm_suspend: function pointer to SoC specific suspend function
203  */
204 void omap_common_suspend_init(void *pm_suspend)
205 {
206         omap_pm_suspend = pm_suspend;
207         suspend_set_ops(&omap_pm_ops);
208 }
209 #endif /* CONFIG_SUSPEND */
210
211 static void __init omap3_init_voltages(void)
212 {
213         if (!soc_is_omap34xx())
214                 return;
215
216         omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
217         omap2_set_init_voltage("core", "l3_ick", "l3_main");
218 }
219
220 static void __init omap4_init_voltages(void)
221 {
222         if (!soc_is_omap44xx())
223                 return;
224
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");
228 }
229
230 int __maybe_unused omap_pm_nop_init(void)
231 {
232         return 0;
233 }
234
235 int (*omap_pm_soc_init)(void);
236
237 int __init omap2_common_pm_late_init(void)
238 {
239         int error;
240
241         if (!omap_pm_soc_init)
242                 return 0;
243
244         /* Init the voltage layer */
245         omap3_twl_init();
246         omap4_twl_init();
247         omap_voltage_late_init();
248
249         /* Initialize the voltages */
250         omap3_init_voltages();
251         omap4_init_voltages();
252
253         /* Smartreflex device init */
254         omap_devinit_smartreflex();
255
256         error = omap_pm_soc_init();
257         if (error)
258                 pr_warn("%s: pm soc init failed: %i\n", __func__, error);
259
260         omap2_clk_enable_autoidle_all();
261
262         return 0;
263 }
264 omap_late_initcall(omap2_common_pm_late_init);