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/clk/tegra.h>
20 #include <linux/cpumask.h>
21 #include <linux/cpu_pm.h>
22 #include <linux/delay.h>
23 #include <linux/err.h>
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/suspend.h>
30 #include <soc/tegra/flowctrl.h>
31 #include <soc/tegra/fuse.h>
32 #include <soc/tegra/pm.h>
33 #include <soc/tegra/pmc.h>
35 #include <asm/cacheflush.h>
36 #include <asm/idmap.h>
37 #include <asm/proc-fns.h>
38 #include <asm/smp_plat.h>
39 #include <asm/suspend.h>
40 #include <asm/tlbflush.h>
41 #include <asm/trusted_foundations.h>
48 #ifdef CONFIG_PM_SLEEP
49 static DEFINE_SPINLOCK(tegra_lp2_lock);
50 static u32 iram_save_size;
51 static void *iram_save_addr;
52 struct tegra_lp1_iram tegra_lp1_iram;
53 void (*tegra_tear_down_cpu)(void);
54 void (*tegra_sleep_core_finish)(unsigned long v2p);
55 static int (*tegra_sleep_func)(unsigned long v2p);
57 static void tegra_tear_down_cpu_init(void)
59 switch (tegra_get_chip_id()) {
61 if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
62 tegra_tear_down_cpu = tegra20_tear_down_cpu;
67 if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
68 IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
69 IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
70 tegra_tear_down_cpu = tegra30_tear_down_cpu;
78 * restores cpu clock setting, clears flow controller
80 * Always called on CPU 0.
82 static void restore_cpu_complex(void)
84 int cpu = smp_processor_id();
89 cpu = cpu_logical_map(cpu);
92 /* Restore the CPU clock settings */
93 tegra_cpu_clock_resume();
95 flowctrl_cpu_suspend_exit(cpu);
101 * saves pll state for use by restart_plls, prepares flow controller for
102 * transition to suspend state
104 * Must always be called on cpu 0.
106 static void suspend_cpu_complex(void)
108 int cpu = smp_processor_id();
113 cpu = cpu_logical_map(cpu);
116 /* Save the CPU clock settings */
117 tegra_cpu_clock_suspend();
119 flowctrl_cpu_suspend_enter(cpu);
122 void tegra_clear_cpu_in_lp2(void)
124 int phy_cpu_id = cpu_logical_map(smp_processor_id());
125 u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;
127 spin_lock(&tegra_lp2_lock);
129 BUG_ON(!(*cpu_in_lp2 & BIT(phy_cpu_id)));
130 *cpu_in_lp2 &= ~BIT(phy_cpu_id);
132 spin_unlock(&tegra_lp2_lock);
135 bool tegra_set_cpu_in_lp2(void)
137 int phy_cpu_id = cpu_logical_map(smp_processor_id());
138 bool last_cpu = false;
139 cpumask_t *cpu_lp2_mask = tegra_cpu_lp2_mask;
140 u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;
142 spin_lock(&tegra_lp2_lock);
144 BUG_ON((*cpu_in_lp2 & BIT(phy_cpu_id)));
145 *cpu_in_lp2 |= BIT(phy_cpu_id);
147 if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask))
149 else if (tegra_get_chip_id() == TEGRA20 && phy_cpu_id == 1)
150 tegra20_cpu_set_resettable_soon();
152 spin_unlock(&tegra_lp2_lock);
156 int tegra_cpu_do_idle(void)
158 return cpu_do_idle();
161 static int tegra_sleep_cpu(unsigned long v2p)
163 setup_mm_for_reboot();
164 tegra_sleep_cpu_finish(v2p);
166 /* should never here */
172 static void tegra_pm_set(enum tegra_suspend_mode mode)
176 switch (tegra_get_chip_id()) {
182 value = flowctrl_read_cpu_csr(0);
183 value &= ~FLOW_CTRL_CSR_ENABLE_EXT_MASK;
184 value |= FLOW_CTRL_CSR_ENABLE_EXT_CRAIL;
185 flowctrl_write_cpu_csr(0, value);
189 tegra_pmc_enter_suspend_mode(mode);
192 void tegra_idle_lp2_last(void)
194 tegra_pm_set(TEGRA_SUSPEND_LP2);
196 cpu_cluster_pm_enter();
197 suspend_cpu_complex();
200 * L2 cache disabling using kernel API only allowed when all
201 * secondary CPU's are offline. Cache have to be disabled early
202 * if cache maintenance is done via Trusted Foundations firmware.
203 * Note that CPUIDLE won't ever enter powergate on Tegra30 if any
204 * of secondary CPU's is online and this is the LP2 codepath only
207 if (trusted_foundations_registered())
210 cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
213 * Resume L2 cache if it wasn't re-enabled early during resume,
214 * which is the case for Tegra30 that has to re-enable the cache
215 * via firmware call. In other cases cache is already enabled and
216 * hence re-enabling is a no-op.
220 restore_cpu_complex();
221 cpu_cluster_pm_exit();
224 enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
225 enum tegra_suspend_mode mode)
228 * The Tegra devices support suspending to LP1 or lower currently.
230 if (mode > TEGRA_SUSPEND_LP1)
231 return TEGRA_SUSPEND_LP1;
236 static int tegra_sleep_core(unsigned long v2p)
238 setup_mm_for_reboot();
239 tegra_sleep_core_finish(v2p);
241 /* should never here */
248 * tegra_lp1_iram_hook
250 * Hooking the address of LP1 reset vector and SDRAM self-refresh code in
251 * SDRAM. These codes not be copied to IRAM in this fuction. We need to
252 * copy these code to IRAM before LP0/LP1 suspend and restore the content
253 * of IRAM after resume.
255 static bool tegra_lp1_iram_hook(void)
257 switch (tegra_get_chip_id()) {
259 if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
260 tegra20_lp1_iram_hook();
265 if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
266 IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
267 IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
268 tegra30_lp1_iram_hook();
274 if (!tegra_lp1_iram.start_addr || !tegra_lp1_iram.end_addr)
277 iram_save_size = tegra_lp1_iram.end_addr - tegra_lp1_iram.start_addr;
278 iram_save_addr = kmalloc(iram_save_size, GFP_KERNEL);
285 static bool tegra_sleep_core_init(void)
287 switch (tegra_get_chip_id()) {
289 if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
290 tegra20_sleep_core_init();
295 if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
296 IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
297 IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
298 tegra30_sleep_core_init();
304 if (!tegra_sleep_core_finish)
310 static void tegra_suspend_enter_lp1(void)
312 /* copy the reset vector & SDRAM shutdown code into IRAM */
313 memcpy(iram_save_addr, IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA),
315 memcpy(IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA),
316 tegra_lp1_iram.start_addr, iram_save_size);
318 *((u32 *)tegra_cpu_lp1_mask) = 1;
321 static void tegra_suspend_exit_lp1(void)
324 memcpy(IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA), iram_save_addr,
327 *(u32 *)tegra_cpu_lp1_mask = 0;
330 static const char *lp_state[TEGRA_MAX_SUSPEND_MODE] = {
331 [TEGRA_SUSPEND_NONE] = "none",
332 [TEGRA_SUSPEND_LP2] = "LP2",
333 [TEGRA_SUSPEND_LP1] = "LP1",
334 [TEGRA_SUSPEND_LP0] = "LP0",
337 static int tegra_suspend_enter(suspend_state_t state)
339 enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();
341 if (WARN_ON(mode < TEGRA_SUSPEND_NONE ||
342 mode >= TEGRA_MAX_SUSPEND_MODE))
345 pr_info("Entering suspend state %s\n", lp_state[mode]);
351 suspend_cpu_complex();
353 case TEGRA_SUSPEND_LP1:
354 tegra_suspend_enter_lp1();
356 case TEGRA_SUSPEND_LP2:
357 tegra_set_cpu_in_lp2();
364 * Cache have to be disabled early if cache maintenance is done
365 * via Trusted Foundations firmware. Otherwise this is a no-op,
368 if (trusted_foundations_registered())
371 cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, tegra_sleep_func);
374 * Resume L2 cache if it wasn't re-enabled early during resume,
375 * which is the case for Tegra30 that has to re-enable the cache
376 * via firmware call. In other cases cache is already enabled and
377 * hence re-enabling is a no-op.
382 case TEGRA_SUSPEND_LP1:
383 tegra_suspend_exit_lp1();
385 case TEGRA_SUSPEND_LP2:
386 tegra_clear_cpu_in_lp2();
391 restore_cpu_complex();
398 static const struct platform_suspend_ops tegra_suspend_ops = {
399 .valid = suspend_valid_only_mem,
400 .enter = tegra_suspend_enter,
403 void __init tegra_init_suspend(void)
405 enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();
407 if (mode == TEGRA_SUSPEND_NONE)
410 tegra_tear_down_cpu_init();
412 if (mode >= TEGRA_SUSPEND_LP1) {
413 if (!tegra_lp1_iram_hook() || !tegra_sleep_core_init()) {
414 pr_err("%s: unable to allocate memory for SDRAM"
415 "self-refresh -- LP0/LP1 unavailable\n",
417 tegra_pmc_set_suspend_mode(TEGRA_SUSPEND_LP2);
418 mode = TEGRA_SUSPEND_LP2;
422 /* set up sleep function for cpu_suspend */
424 case TEGRA_SUSPEND_LP1:
425 tegra_sleep_func = tegra_sleep_core;
427 case TEGRA_SUSPEND_LP2:
428 tegra_sleep_func = tegra_sleep_cpu;
434 suspend_set_ops(&tegra_suspend_ops);