summaryrefslogtreecommitdiff
path: root/arch/arm/mach-tegra/pm.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-tegra/pm.c')
-rw-r--r--arch/arm/mach-tegra/pm.c148
1 files changed, 138 insertions, 10 deletions
diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index 261fec140c06..ed294a04e1d3 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -37,12 +37,18 @@
#include "reset.h"
#include "flowctrl.h"
#include "fuse.h"
+#include "pm.h"
#include "pmc.h"
#include "sleep.h"
#ifdef CONFIG_PM_SLEEP
static DEFINE_SPINLOCK(tegra_lp2_lock);
+static u32 iram_save_size;
+static void *iram_save_addr;
+struct tegra_lp1_iram tegra_lp1_iram;
void (*tegra_tear_down_cpu)(void);
+void (*tegra_sleep_core_finish)(unsigned long v2p);
+static int (*tegra_sleep_func)(unsigned long v2p);
static void tegra_tear_down_cpu_init(void)
{
@@ -52,7 +58,9 @@ static void tegra_tear_down_cpu_init(void)
tegra_tear_down_cpu = tegra20_tear_down_cpu;
break;
case TEGRA30:
- if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC))
+ case TEGRA114:
+ if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
+ IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC))
tegra_tear_down_cpu = tegra30_tear_down_cpu;
break;
}
@@ -171,19 +179,109 @@ void tegra_idle_lp2_last(void)
enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
enum tegra_suspend_mode mode)
{
- /* Tegra114 didn't support any suspending mode yet. */
- if (tegra_chip_id == TEGRA114)
- return TEGRA_SUSPEND_NONE;
-
/*
- * The Tegra devices only support suspending to LP2 currently.
+ * The Tegra devices support suspending to LP1 or lower currently.
*/
- if (mode > TEGRA_SUSPEND_LP2)
- return TEGRA_SUSPEND_LP2;
+ if (mode > TEGRA_SUSPEND_LP1)
+ return TEGRA_SUSPEND_LP1;
return mode;
}
+static int tegra_sleep_core(unsigned long v2p)
+{
+ setup_mm_for_reboot();
+ tegra_sleep_core_finish(v2p);
+
+ /* should never here */
+ BUG();
+
+ return 0;
+}
+
+/*
+ * tegra_lp1_iram_hook
+ *
+ * Hooking the address of LP1 reset vector and SDRAM self-refresh code in
+ * SDRAM. These codes not be copied to IRAM in this fuction. We need to
+ * copy these code to IRAM before LP0/LP1 suspend and restore the content
+ * of IRAM after resume.
+ */
+static bool tegra_lp1_iram_hook(void)
+{
+ switch (tegra_chip_id) {
+ case TEGRA20:
+ if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
+ tegra20_lp1_iram_hook();
+ break;
+ case TEGRA30:
+ case TEGRA114:
+ if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
+ IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC))
+ tegra30_lp1_iram_hook();
+ break;
+ default:
+ break;
+ }
+
+ if (!tegra_lp1_iram.start_addr || !tegra_lp1_iram.end_addr)
+ return false;
+
+ iram_save_size = tegra_lp1_iram.end_addr - tegra_lp1_iram.start_addr;
+ iram_save_addr = kmalloc(iram_save_size, GFP_KERNEL);
+ if (!iram_save_addr)
+ return false;
+
+ return true;
+}
+
+static bool tegra_sleep_core_init(void)
+{
+ switch (tegra_chip_id) {
+ case TEGRA20:
+ if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
+ tegra20_sleep_core_init();
+ break;
+ case TEGRA30:
+ case TEGRA114:
+ if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
+ IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC))
+ tegra30_sleep_core_init();
+ break;
+ default:
+ break;
+ }
+
+ if (!tegra_sleep_core_finish)
+ return false;
+
+ return true;
+}
+
+static void tegra_suspend_enter_lp1(void)
+{
+ tegra_pmc_suspend();
+
+ /* copy the reset vector & SDRAM shutdown code into IRAM */
+ memcpy(iram_save_addr, IO_ADDRESS(TEGRA_IRAM_CODE_AREA),
+ iram_save_size);
+ memcpy(IO_ADDRESS(TEGRA_IRAM_CODE_AREA), tegra_lp1_iram.start_addr,
+ iram_save_size);
+
+ *((u32 *)tegra_cpu_lp1_mask) = 1;
+}
+
+static void tegra_suspend_exit_lp1(void)
+{
+ tegra_pmc_resume();
+
+ /* restore IRAM */
+ memcpy(IO_ADDRESS(TEGRA_IRAM_CODE_AREA), iram_save_addr,
+ iram_save_size);
+
+ *(u32 *)tegra_cpu_lp1_mask = 0;
+}
+
static const char *lp_state[TEGRA_MAX_SUSPEND_MODE] = {
[TEGRA_SUSPEND_NONE] = "none",
[TEGRA_SUSPEND_LP2] = "LP2",
@@ -207,6 +305,9 @@ static int tegra_suspend_enter(suspend_state_t state)
suspend_cpu_complex();
switch (mode) {
+ case TEGRA_SUSPEND_LP1:
+ tegra_suspend_enter_lp1();
+ break;
case TEGRA_SUSPEND_LP2:
tegra_set_cpu_in_lp2();
break;
@@ -214,9 +315,12 @@ static int tegra_suspend_enter(suspend_state_t state)
break;
}
- cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
+ cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, tegra_sleep_func);
switch (mode) {
+ case TEGRA_SUSPEND_LP1:
+ tegra_suspend_exit_lp1();
+ break;
case TEGRA_SUSPEND_LP2:
tegra_clear_cpu_in_lp2();
break;
@@ -237,12 +341,36 @@ static const struct platform_suspend_ops tegra_suspend_ops = {
void __init tegra_init_suspend(void)
{
- if (tegra_pmc_get_suspend_mode() == TEGRA_SUSPEND_NONE)
+ enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();
+
+ if (mode == TEGRA_SUSPEND_NONE)
return;
tegra_tear_down_cpu_init();
tegra_pmc_suspend_init();
+ if (mode >= TEGRA_SUSPEND_LP1) {
+ if (!tegra_lp1_iram_hook() || !tegra_sleep_core_init()) {
+ pr_err("%s: unable to allocate memory for SDRAM"
+ "self-refresh -- LP0/LP1 unavailable\n",
+ __func__);
+ tegra_pmc_set_suspend_mode(TEGRA_SUSPEND_LP2);
+ mode = TEGRA_SUSPEND_LP2;
+ }
+ }
+
+ /* set up sleep function for cpu_suspend */
+ switch (mode) {
+ case TEGRA_SUSPEND_LP1:
+ tegra_sleep_func = tegra_sleep_core;
+ break;
+ case TEGRA_SUSPEND_LP2:
+ tegra_sleep_func = tegra_sleep_cpu;
+ break;
+ default:
+ break;
+ }
+
suspend_set_ops(&tegra_suspend_ops);
}
#endif