exo2: implement the first half of SmcCpuSuspend

libexosphere/include/exosphere/clkrst.hpp

@@ -27,6 +27,7 @@ namespace ams::clkrst {
     void EnableUartCClock();
     void EnableActmonClock();
     void EnableI2c1Clock();
+    void EnableI2c5Clock();
 
     void DisableI2c1Clock();
 

libexosphere/include/exosphere/flow.hpp

@@ -25,5 +25,6 @@ namespace ams::flow {
     void SetCpuCsr(int core, u32 enable_ext);
     void SetHaltCpuEvents(int core, bool resume_on_irq);
     void SetCc4Ctrl(int core, u32 value);
+    void ClearL2FlushControl();
 
 }

libexosphere/include/exosphere/pmc.hpp

@@ -36,6 +36,8 @@ namespace ams::pmc {
     void SetRegisterAddress(uintptr_t address);
 
     void InitializeRandomScratch();
+    void EnableWakeEventDetection();
+    void ConfigureForSc7Entry();
 
     void LockSecureRegister(SecureRegister reg);
 

libexosphere/include/exosphere/pmic.hpp

@@ -29,5 +29,7 @@ namespace ams::pmic {
 
     void EnableVddCpu(Regulator regulator);
     void DisableVddCpu(Regulator regulator);
+    void EnableSleep();
+    bool IsAcOk();
 
 }

libexosphere/include/exosphere/tegra/tegra_flow_ctlr.hpp

@@ -18,6 +18,7 @@
 
 
 #define FLOW_CTLR_FLOW_DBG_QUAL        (0x050)
+#define FLOW_CTLR_L2FLUSH_CONTROL      (0x094)
 #define FLOW_CTLR_BPMP_CLUSTER_CONTROL (0x098)
 
 #define FLOW_CTLR_CPU0_CSR             (0x008)

libexosphere/include/exosphere/tegra/tegra_pmc.hpp

@@ -212,3 +212,5 @@ DEFINE_PMC_REG_BIT_ENUM(CLAMP_STATUS_XUSBB, 21, DISABLE, ENABLE);
 DEFINE_PMC_REG_BIT_ENUM(CLAMP_STATUS_XUSBC, 22, DISABLE, ENABLE);
 DEFINE_PMC_REG_BIT_ENUM(CLAMP_STATUS_VIC,   23, DISABLE, ENABLE);
 DEFINE_PMC_REG_BIT_ENUM(CLAMP_STATUS_IRAM,  24, DISABLE, ENABLE);
+
+DEFINE_PMC_REG_BIT_ENUM(CNTRL2_WAKE_DET_EN, 9, DISABLE, ENABLE);

libexosphere/source/clkrst/clkrst_api.cpp

@@ -105,7 +105,7 @@ namespace ams::clkrst {
     }
 
     void EnableI2c5Clock() {
-        EnableClock(I2c1Clock);
+        EnableClock(I2c5Clock);
     }
 
     void DisableI2c1Clock() {

libexosphere/source/flow/flow_api.cpp

@@ -76,4 +76,8 @@ namespace ams::flow {
         reg::Write(g_register_address + FlowControllerRegisterOffsets[core].cc4_core_ctrl, value);
     }
 
+    void ClearL2FlushControl() {
+        reg::Write(g_register_address + FLOW_CTLR_L2FLUSH_CONTROL, 0);
+    }
+
 }

libexosphere/source/pmc/pmc_api.cpp

@@ -224,6 +224,32 @@ namespace ams::pmc {
         LockSecureRegister(SecureRegister_Srk);
     }
 
+    void EnableWakeEventDetection() {
+        /* Get the address. */
+        const uintptr_t address = g_register_address;
+
+        /* Wait 75us, then enable event detection, then wait another 75us. */
+        util::WaitMicroSeconds(75);
+        reg::ReadWrite(address + APBDEV_PMC_CNTRL2,  PMC_REG_BITS_ENUM(CNTRL2_WAKE_DET_EN, ENABLE));
+        util::WaitMicroSeconds(75);
+
+        /* Enable all wake events. */
+        reg::Write(address + APBDEV_PMC_WAKE_STATUS,  0xFFFFFFFFu);
+        reg::Write(address + APBDEV_PMC_WAKE2_STATUS, 0xFFFFFFFFu);
+        util::WaitMicroSeconds(75);
+    }
+
+    void ConfigureForSc7Entry() {
+        /* Get the address. */
+        const uintptr_t address = g_register_address;
+
+        /* Configure the bootrom to perform a warmboot. */
+        reg::Write(address + APBDEV_PMC_SCRATCH0, 0x1);
+
+        /* Enable the TSC multiplier. */
+        reg::ReadWrite(address + APBDEV_PMC_DPD_ENABLE, PMC_REG_BITS_ENUM(DPD_ENABLE_TSC_MULT_EN, ENABLE));
+    }
+
     void LockSecureRegister(SecureRegister reg) {
         /* Get the address. */
         const uintptr_t address = g_register_address;

libexosphere/source/pmic/pmic_api.cpp

@@ -25,13 +25,17 @@ namespace ams::pmic {
         constexpr inline int I2cAddressMarikoMax77812_A = 0x31;
         constexpr inline int I2cAddressMarikoMax77812_B = 0x33;
 
+        constexpr inline int I2cAddressMax77620Pmic     = 0x3C;
 
+        /* https://github.com/Atmosphere-NX/Atmosphere/blob/master/emummc/source/power/max77620.h */
         /* https://github.com/Atmosphere-NX/Atmosphere/blob/master/emummc/source/power/max7762x.h */
         /* TODO: Find datasheet, link to it instead. */
         /* NOTE: Tentatively, Max77620 "mostly" matches https://datasheets.maximintegrated.com/en/ds/MAX77863.pdf. */
         /*       This does not contain Max77621 documentation, though. */
-        constexpr inline int Max77620RegisterGpio0   = 0x36;
+        constexpr inline int Max77620RegisterOnOffStat  = 0x15;
-        constexpr inline int Max77620RegisterAmeGpio = 0x40;
+        constexpr inline int Max77620RegisterGpio0      = 0x36;
+        constexpr inline int Max77620RegisterAmeGpio    = 0x40;
+        constexpr inline int Max77620RegisterOnOffCnfg1 = 0x41;
 
         constexpr inline int Max77621RegisterVOut     = 0x00;
         constexpr inline int Max77621RegisterVOutDvc  = 0x01;
@@ -108,6 +112,10 @@ namespace ams::pmic {
             }
         }
 
+        u8 GetPmicOnOffStat() {
+            return i2c::QueryByte(i2c::Port_5, I2cAddressMax77620Pmic, Max77620RegisterOnOffStat);
+        }
+
     }
 
     void EnableVddCpu(Regulator regulator) {
@@ -132,4 +140,19 @@ namespace ams::pmic {
         }
     }
 
+    void EnableSleep() {
+        /* Get the current onoff cfg. */
+        u8 cnfg = i2c::QueryByte(i2c::Port_5, I2cAddressMax77620Pmic, Max77620RegisterOnOffCnfg1);
+
+        /* Set SlpEn. */
+        cnfg |= (1 << 2);
+
+        /* Write the new cfg. */
+        i2c::SendByte(i2c::Port_5, I2cAddressMax77620Pmic, Max77620RegisterOnOffCnfg1, cnfg);
+    }
+
+    bool IsAcOk() {
+        return (GetPmicOnOffStat() & (1 << 1)) != 0;
+    }
+
 }