2 * CPU complex suspend & resume functions for Tegra SoCs
4 * Copyright (c) 2009-2012, NVIDIA Corporation. All rights reserved.
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.
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
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/>.
19 #include <linux/kernel.h>
20 #include <linux/spinlock.h>
22 #include <linux/cpumask.h>
23 #include <linux/delay.h>
24 #include <linux/cpu_pm.h>
25 #include <linux/suspend.h>
26 #include <linux/err.h>
27 #include <linux/clk/tegra.h>
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>
43 #ifdef CONFIG_PM_SLEEP
44 static DEFINE_SPINLOCK(tegra_lp2_lock);
45 void (*tegra_tear_down_cpu)(void);
50 * restores cpu clock setting, clears flow controller
52 * Always called on CPU 0.
54 static void restore_cpu_complex(void)
56 int cpu = smp_processor_id();
61 cpu = cpu_logical_map(cpu);
64 /* Restore the CPU clock settings */
65 tegra_cpu_clock_resume();
67 flowctrl_cpu_suspend_exit(cpu);
73 * saves pll state for use by restart_plls, prepares flow controller for
74 * transition to suspend state
76 * Must always be called on cpu 0.
78 static void suspend_cpu_complex(void)
80 int cpu = smp_processor_id();
85 cpu = cpu_logical_map(cpu);
88 /* Save the CPU clock settings */
89 tegra_cpu_clock_suspend();
91 flowctrl_cpu_suspend_enter(cpu);
94 void tegra_clear_cpu_in_lp2(int phy_cpu_id)
96 u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;
98 spin_lock(&tegra_lp2_lock);
100 BUG_ON(!(*cpu_in_lp2 & BIT(phy_cpu_id)));
101 *cpu_in_lp2 &= ~BIT(phy_cpu_id);
103 spin_unlock(&tegra_lp2_lock);
106 bool tegra_set_cpu_in_lp2(int phy_cpu_id)
108 bool last_cpu = false;
109 cpumask_t *cpu_lp2_mask = tegra_cpu_lp2_mask;
110 u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;
112 spin_lock(&tegra_lp2_lock);
114 BUG_ON((*cpu_in_lp2 & BIT(phy_cpu_id)));
115 *cpu_in_lp2 |= BIT(phy_cpu_id);
117 if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask))
119 else if (tegra_chip_id == TEGRA20 && phy_cpu_id == 1)
120 tegra20_cpu_set_resettable_soon();
122 spin_unlock(&tegra_lp2_lock);
126 static int tegra_sleep_cpu(unsigned long v2p)
128 /* Switch to the identity mapping. */
129 cpu_switch_mm(idmap_pgd, &init_mm);
132 local_flush_tlb_all();
134 tegra_sleep_cpu_finish(v2p);
136 /* should never here */
142 void tegra_idle_lp2_last(void)
144 tegra_pmc_pm_set(TEGRA_SUSPEND_LP2);
146 cpu_cluster_pm_enter();
147 suspend_cpu_complex();
149 cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
151 restore_cpu_complex();
152 cpu_cluster_pm_exit();
155 enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
156 enum tegra_suspend_mode mode)
158 /* Tegra114 didn't support any suspending mode yet. */
159 if (tegra_chip_id == TEGRA114)
160 return TEGRA_SUSPEND_NONE;
163 * The Tegra devices only support suspending to LP2 currently.
165 if (mode > TEGRA_SUSPEND_LP2)
166 return TEGRA_SUSPEND_LP2;
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",
178 static int __cpuinit tegra_suspend_enter(suspend_state_t state)
180 enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();
182 if (WARN_ON(mode < TEGRA_SUSPEND_NONE ||
183 mode >= TEGRA_MAX_SUSPEND_MODE))
186 pr_info("Entering suspend state %s\n", lp_state[mode]);
188 tegra_pmc_pm_set(mode);
192 suspend_cpu_complex();
194 case TEGRA_SUSPEND_LP2:
195 tegra_set_cpu_in_lp2(0);
201 cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
204 case TEGRA_SUSPEND_LP2:
205 tegra_clear_cpu_in_lp2(0);
210 restore_cpu_complex();
217 static const struct platform_suspend_ops tegra_suspend_ops = {
218 .valid = suspend_valid_only_mem,
219 .enter = tegra_suspend_enter,
222 void __init tegra_init_suspend(void)
224 if (tegra_pmc_get_suspend_mode() == TEGRA_SUSPEND_NONE)
227 tegra_pmc_suspend_init();
229 suspend_set_ops(&tegra_suspend_ops);