--- zzzz-none-000/linux-3.10.107/arch/arm/mach-tegra/pm.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/arm/mach-tegra/pm.c	2021-02-04 17:41:59.000000000 +0000
@@ -16,33 +16,60 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <linux/kernel.h>
-#include <linux/spinlock.h>
-#include <linux/io.h>
+#include <linux/clk/tegra.h>
 #include <linux/cpumask.h>
-#include <linux/delay.h>
 #include <linux/cpu_pm.h>
-#include <linux/suspend.h>
+#include <linux/delay.h>
 #include <linux/err.h>
-#include <linux/clk/tegra.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/suspend.h>
+
+#include <soc/tegra/fuse.h>
+#include <soc/tegra/pm.h>
+#include <soc/tegra/pmc.h>
 
-#include <asm/smp_plat.h>
 #include <asm/cacheflush.h>
-#include <asm/suspend.h>
 #include <asm/idmap.h>
 #include <asm/proc-fns.h>
+#include <asm/smp_plat.h>
+#include <asm/suspend.h>
 #include <asm/tlbflush.h>
 
+#include "flowctrl.h"
 #include "iomap.h"
+#include "pm.h"
 #include "reset.h"
-#include "flowctrl.h"
-#include "fuse.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)
+{
+	switch (tegra_get_chip_id()) {
+	case TEGRA20:
+		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
+			tegra_tear_down_cpu = tegra20_tear_down_cpu;
+		break;
+	case TEGRA30:
+	case TEGRA114:
+	case TEGRA124:
+		if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
+		    IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
+		    IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
+			tegra_tear_down_cpu = tegra30_tear_down_cpu;
+		break;
+	}
+}
 
 /*
  * restore_cpu_complex
@@ -91,8 +118,9 @@
 	flowctrl_cpu_suspend_enter(cpu);
 }
 
-void tegra_clear_cpu_in_lp2(int phy_cpu_id)
+void tegra_clear_cpu_in_lp2(void)
 {
+	int phy_cpu_id = cpu_logical_map(smp_processor_id());
 	u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;
 
 	spin_lock(&tegra_lp2_lock);
@@ -103,8 +131,9 @@
 	spin_unlock(&tegra_lp2_lock);
 }
 
-bool tegra_set_cpu_in_lp2(int phy_cpu_id)
+bool tegra_set_cpu_in_lp2(void)
 {
+	int phy_cpu_id = cpu_logical_map(smp_processor_id());
 	bool last_cpu = false;
 	cpumask_t *cpu_lp2_mask = tegra_cpu_lp2_mask;
 	u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;
@@ -116,7 +145,7 @@
 
 	if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask))
 		last_cpu = true;
-	else if (tegra_chip_id == TEGRA20 && phy_cpu_id == 1)
+	else if (tegra_get_chip_id() == TEGRA20 && phy_cpu_id == 1)
 		tegra20_cpu_set_resettable_soon();
 
 	spin_unlock(&tegra_lp2_lock);
@@ -139,9 +168,29 @@
 	return 0;
 }
 
+static void tegra_pm_set(enum tegra_suspend_mode mode)
+{
+	u32 value;
+
+	switch (tegra_get_chip_id()) {
+	case TEGRA20:
+	case TEGRA30:
+		break;
+	default:
+		/* Turn off CRAIL */
+		value = flowctrl_read_cpu_csr(0);
+		value &= ~FLOW_CTRL_CSR_ENABLE_EXT_MASK;
+		value |= FLOW_CTRL_CSR_ENABLE_EXT_CRAIL;
+		flowctrl_write_cpu_csr(0, value);
+		break;
+	}
+
+	tegra_pmc_enter_suspend_mode(mode);
+}
+
 void tegra_idle_lp2_last(void)
 {
-	tegra_pmc_pm_set(TEGRA_SUSPEND_LP2);
+	tegra_pm_set(TEGRA_SUSPEND_LP2);
 
 	cpu_cluster_pm_enter();
 	suspend_cpu_complex();
@@ -155,19 +204,109 @@
 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_get_chip_id()) {
+	case TEGRA20:
+		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
+			tegra20_lp1_iram_hook();
+		break;
+	case TEGRA30:
+	case TEGRA114:
+	case TEGRA124:
+		if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
+		    IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
+		    IS_ENABLED(CONFIG_ARCH_TEGRA_124_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_get_chip_id()) {
+	case TEGRA20:
+		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
+			tegra20_sleep_core_init();
+		break;
+	case TEGRA30:
+	case TEGRA114:
+	case TEGRA124:
+		if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
+		    IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
+		    IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
+			tegra30_sleep_core_init();
+		break;
+	default:
+		break;
+	}
+
+	if (!tegra_sleep_core_finish)
+		return false;
+
+	return true;
+}
+
+static void tegra_suspend_enter_lp1(void)
+{
+	/* copy the reset vector & SDRAM shutdown code into IRAM */
+	memcpy(iram_save_addr, IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA),
+		iram_save_size);
+	memcpy(IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA),
+		tegra_lp1_iram.start_addr, iram_save_size);
+
+	*((u32 *)tegra_cpu_lp1_mask) = 1;
+}
+
+static void tegra_suspend_exit_lp1(void)
+{
+	/* restore IRAM */
+	memcpy(IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_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",
@@ -175,7 +314,7 @@
 	[TEGRA_SUSPEND_LP0] = "LP0",
 };
 
-static int __cpuinit tegra_suspend_enter(suspend_state_t state)
+static int tegra_suspend_enter(suspend_state_t state)
 {
 	enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();
 
@@ -185,24 +324,30 @@
 
 	pr_info("Entering suspend state %s\n", lp_state[mode]);
 
-	tegra_pmc_pm_set(mode);
+	tegra_pm_set(mode);
 
 	local_fiq_disable();
 
 	suspend_cpu_complex();
 	switch (mode) {
+	case TEGRA_SUSPEND_LP1:
+		tegra_suspend_enter_lp1();
+		break;
 	case TEGRA_SUSPEND_LP2:
-		tegra_set_cpu_in_lp2(0);
+		tegra_set_cpu_in_lp2();
 		break;
 	default:
 		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(0);
+		tegra_clear_cpu_in_lp2();
 		break;
 	default:
 		break;
@@ -221,10 +366,34 @@
 
 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_pmc_suspend_init();
+	tegra_tear_down_cpu_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);
 }