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d457ef35 JL |
1 | /* |
2 | * CPU complex suspend & resume functions for Tegra SoCs | |
3 | * | |
4 | * Copyright (c) 2009-2012, NVIDIA Corporation. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/io.h> | |
22 | #include <linux/cpumask.h> | |
d552920a JL |
23 | #include <linux/delay.h> |
24 | #include <linux/cpu_pm.h> | |
c8c2e606 | 25 | #include <linux/suspend.h> |
d552920a | 26 | #include <linux/err.h> |
89572c77 | 27 | #include <linux/clk/tegra.h> |
d552920a JL |
28 | |
29 | #include <asm/smp_plat.h> | |
30 | #include <asm/cacheflush.h> | |
31 | #include <asm/suspend.h> | |
32 | #include <asm/idmap.h> | |
33 | #include <asm/proc-fns.h> | |
34 | #include <asm/tlbflush.h> | |
d457ef35 JL |
35 | |
36 | #include "iomap.h" | |
37 | #include "reset.h" | |
d552920a | 38 | #include "flowctrl.h" |
5c1350bd | 39 | #include "fuse.h" |
0337c3e0 | 40 | #include "pmc.h" |
d552920a | 41 | #include "sleep.h" |
d552920a | 42 | |
d457ef35 | 43 | #ifdef CONFIG_PM_SLEEP |
d457ef35 | 44 | static DEFINE_SPINLOCK(tegra_lp2_lock); |
d552920a | 45 | void (*tegra_tear_down_cpu)(void); |
d457ef35 | 46 | |
d552920a JL |
47 | /* |
48 | * restore_cpu_complex | |
49 | * | |
50 | * restores cpu clock setting, clears flow controller | |
51 | * | |
52 | * Always called on CPU 0. | |
53 | */ | |
54 | static void restore_cpu_complex(void) | |
55 | { | |
56 | int cpu = smp_processor_id(); | |
57 | ||
58 | BUG_ON(cpu != 0); | |
59 | ||
60 | #ifdef CONFIG_SMP | |
61 | cpu = cpu_logical_map(cpu); | |
62 | #endif | |
63 | ||
64 | /* Restore the CPU clock settings */ | |
65 | tegra_cpu_clock_resume(); | |
66 | ||
67 | flowctrl_cpu_suspend_exit(cpu); | |
d552920a JL |
68 | } |
69 | ||
70 | /* | |
71 | * suspend_cpu_complex | |
72 | * | |
73 | * saves pll state for use by restart_plls, prepares flow controller for | |
74 | * transition to suspend state | |
75 | * | |
76 | * Must always be called on cpu 0. | |
77 | */ | |
78 | static void suspend_cpu_complex(void) | |
79 | { | |
80 | int cpu = smp_processor_id(); | |
81 | ||
82 | BUG_ON(cpu != 0); | |
83 | ||
84 | #ifdef CONFIG_SMP | |
85 | cpu = cpu_logical_map(cpu); | |
86 | #endif | |
87 | ||
88 | /* Save the CPU clock settings */ | |
89 | tegra_cpu_clock_suspend(); | |
90 | ||
91 | flowctrl_cpu_suspend_enter(cpu); | |
d552920a JL |
92 | } |
93 | ||
8c627fa6 | 94 | void tegra_clear_cpu_in_lp2(int phy_cpu_id) |
d457ef35 JL |
95 | { |
96 | u32 *cpu_in_lp2 = tegra_cpu_lp2_mask; | |
97 | ||
98 | spin_lock(&tegra_lp2_lock); | |
99 | ||
100 | BUG_ON(!(*cpu_in_lp2 & BIT(phy_cpu_id))); | |
101 | *cpu_in_lp2 &= ~BIT(phy_cpu_id); | |
102 | ||
103 | spin_unlock(&tegra_lp2_lock); | |
104 | } | |
105 | ||
8c627fa6 | 106 | bool tegra_set_cpu_in_lp2(int phy_cpu_id) |
d457ef35 JL |
107 | { |
108 | bool last_cpu = false; | |
109 | cpumask_t *cpu_lp2_mask = tegra_cpu_lp2_mask; | |
110 | u32 *cpu_in_lp2 = tegra_cpu_lp2_mask; | |
111 | ||
112 | spin_lock(&tegra_lp2_lock); | |
113 | ||
114 | BUG_ON((*cpu_in_lp2 & BIT(phy_cpu_id))); | |
115 | *cpu_in_lp2 |= BIT(phy_cpu_id); | |
116 | ||
117 | if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask)) | |
118 | last_cpu = true; | |
5c1350bd JL |
119 | else if (tegra_chip_id == TEGRA20 && phy_cpu_id == 1) |
120 | tegra20_cpu_set_resettable_soon(); | |
d457ef35 JL |
121 | |
122 | spin_unlock(&tegra_lp2_lock); | |
123 | return last_cpu; | |
124 | } | |
d552920a | 125 | |
2058842e AB |
126 | int tegra_cpu_do_idle(void) |
127 | { | |
128 | return cpu_do_idle(); | |
129 | } | |
130 | ||
d552920a JL |
131 | static int tegra_sleep_cpu(unsigned long v2p) |
132 | { | |
6affb482 | 133 | setup_mm_for_reboot(); |
d552920a JL |
134 | tegra_sleep_cpu_finish(v2p); |
135 | ||
136 | /* should never here */ | |
137 | BUG(); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
4d82d058 | 142 | void tegra_idle_lp2_last(void) |
d552920a | 143 | { |
c8c2e606 | 144 | tegra_pmc_pm_set(TEGRA_SUSPEND_LP2); |
d552920a JL |
145 | |
146 | cpu_cluster_pm_enter(); | |
147 | suspend_cpu_complex(); | |
d552920a JL |
148 | |
149 | cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu); | |
150 | ||
d552920a JL |
151 | restore_cpu_complex(); |
152 | cpu_cluster_pm_exit(); | |
153 | } | |
c8c2e606 JL |
154 | |
155 | enum tegra_suspend_mode tegra_pm_validate_suspend_mode( | |
156 | enum tegra_suspend_mode mode) | |
157 | { | |
158 | /* Tegra114 didn't support any suspending mode yet. */ | |
159 | if (tegra_chip_id == TEGRA114) | |
160 | return TEGRA_SUSPEND_NONE; | |
161 | ||
162 | /* | |
163 | * The Tegra devices only support suspending to LP2 currently. | |
164 | */ | |
165 | if (mode > TEGRA_SUSPEND_LP2) | |
166 | return TEGRA_SUSPEND_LP2; | |
167 | ||
168 | return mode; | |
169 | } | |
170 | ||
171 | static const char *lp_state[TEGRA_MAX_SUSPEND_MODE] = { | |
172 | [TEGRA_SUSPEND_NONE] = "none", | |
173 | [TEGRA_SUSPEND_LP2] = "LP2", | |
174 | [TEGRA_SUSPEND_LP1] = "LP1", | |
175 | [TEGRA_SUSPEND_LP0] = "LP0", | |
176 | }; | |
177 | ||
178 | static int __cpuinit tegra_suspend_enter(suspend_state_t state) | |
179 | { | |
180 | enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode(); | |
181 | ||
182 | if (WARN_ON(mode < TEGRA_SUSPEND_NONE || | |
183 | mode >= TEGRA_MAX_SUSPEND_MODE)) | |
184 | return -EINVAL; | |
185 | ||
186 | pr_info("Entering suspend state %s\n", lp_state[mode]); | |
187 | ||
188 | tegra_pmc_pm_set(mode); | |
189 | ||
190 | local_fiq_disable(); | |
191 | ||
192 | suspend_cpu_complex(); | |
193 | switch (mode) { | |
194 | case TEGRA_SUSPEND_LP2: | |
195 | tegra_set_cpu_in_lp2(0); | |
196 | break; | |
197 | default: | |
198 | break; | |
199 | } | |
200 | ||
201 | cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu); | |
202 | ||
203 | switch (mode) { | |
204 | case TEGRA_SUSPEND_LP2: | |
205 | tegra_clear_cpu_in_lp2(0); | |
206 | break; | |
207 | default: | |
208 | break; | |
209 | } | |
210 | restore_cpu_complex(); | |
211 | ||
212 | local_fiq_enable(); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static const struct platform_suspend_ops tegra_suspend_ops = { | |
218 | .valid = suspend_valid_only_mem, | |
219 | .enter = tegra_suspend_enter, | |
220 | }; | |
221 | ||
222 | void __init tegra_init_suspend(void) | |
223 | { | |
224 | if (tegra_pmc_get_suspend_mode() == TEGRA_SUSPEND_NONE) | |
225 | return; | |
226 | ||
227 | tegra_pmc_suspend_init(); | |
228 | ||
229 | suspend_set_ops(&tegra_suspend_ops); | |
230 | } | |
d457ef35 | 231 | #endif |