warmboot: add i2c code to enable PMIC

exosphere/lp0fw/src/car.h

@@ -33,6 +33,8 @@
 #define CLK_RST_CONTROLLER_SUPER_CCLKG_DIVIDER_0 MAKE_CAR_REG(0x36C)
 #define CLK_RST_CONTROLLER_SUPER_CCLKP_DIVIDER_0 MAKE_CAR_REG(0x374)
 
+#define CLK_RST_CONTROLLER_CLK_SOURCE_I2C5_0 MAKE_CAR_REG(0x128)
+
 #define CLK_RST_CONTROLLER_CLK_SOURCE_DVFS_REF_0 MAKE_CAR_REG(0x62C)
 #define CLK_RST_CONTROLLER_CLK_SOURCE_DVFS_SOC_0 MAKE_CAR_REG(0x630)
 
@@ -52,6 +54,7 @@
 #define CLK_RST_CONTROLLER_RST_DEV_H_SET_0 MAKE_CAR_REG(0x308)
 #define CLK_RST_CONTROLLER_RST_DEV_U_SET_0 MAKE_CAR_REG(0x310)
 
+#define CLK_RST_CONTROLLER_RST_DEV_H_CLR_0 MAKE_CAR_REG(0x30C)
 #define CLK_RST_CONTROLLER_RST_DEV_U_CLR_0 MAKE_CAR_REG(0x314)
 #define CLK_RST_CONTROLLER_RST_DEV_V_CLR_0 MAKE_CAR_REG(0x434)
 

exosphere/lp0fw/src/cluster.c

@@ -21,6 +21,8 @@
 #include "car.h"
 #include "timer.h"
 #include "pmc.h"
+#include "misc.h"
+#include "i2c.h"
 #include "sysreg.h"
 
 void cluster_initialize_cpu(void) {
@@ -79,10 +81,15 @@ void cluster_initialize_cpu(void) {
     CLK_RST_CONTROLLER_CLK_SOURCE_DVFS_REF_0 = 0xE;
     CLK_RST_CONTROLLER_CLK_SOURCE_DVFS_SOC_0 = 0xE;
     
-    /* Power on I2C5, wait 5 us. */
+    /* Power on I2C5, wait 5 us, set source + take out of reset. */
     CLK_RST_CONTROLLER_CLK_ENB_H_SET_0 = 0x8000;
     CLK_RST_CONTROLLER_RST_DEV_H_SET_0 = 0x8000;
     timer_wait(5);
+    CLK_RST_CONTROLLER_CLK_SOURCE_I2C5_0 = 0x4;
+    CLK_RST_CONTROLLER_RST_DEV_H_CLR_0 = 0x8000;
+    
+    /* Enable the PMIC. */
+    i2c_enable_pmic();
     
     /* TODO: This function is enormous */
 }

exosphere/lp0fw/src/i2c.c

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2018 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
+#include "i2c.h"
+#include "timer.h"
+
+/* Prototypes for internal commands. */
+void i2c_set_test_master_config_load(void);
+void i2c_write(unsigned int device, uint32_t val, unsigned int num_bytes);
+void i2c_send_byte_command(unsigned int device, unsigned char reg, unsigned char b);
+
+/* Load hardware config for I2C5. */
+void i2c_set_test_master_config_load(void) {
+    /* Set MSTR_CONFIG_LOAD. */
+    I2C_I2C_CONFIG_LOAD_0 = 0x1;
+    
+    while (!(I2C_I2C_CONFIG_LOAD_0 & 1)) {
+        /* Wait forever until it's set. */
+    }
+}
+
+/* Writes a value to an i2c device. */
+void i2c_write(unsigned int device, uint32_t val, unsigned int num_bytes) {
+    if (num_bytes > 4) {
+        return;
+    }
+
+    /* Set device for 7-bit mode. */
+    I2C_I2C_CMD_ADDR0_0 = device << 1;
+
+    /* Load in data to write. */
+    I2C_I2C_CMD_DATA1_0 = val;
+
+    /* Set config with LENGTH = num_bytes, NEW_MASTER_FSM, DEBOUNCE_CNT = 4T. */
+    I2C_I2C_CNFG_0 = ((num_bytes << 1) - 2) | 0x2800;
+
+    i2c_set_test_master_config_load();
+
+    /* Config |= SEND; */
+    I2C_I2C_CNFG_0 = ((num_bytes << 1) - 2) | 0x2800 | 0x200;
+
+
+    while (I2C_I2C_STATUS_0 & 0x100) {
+        /* Wait until not busy. */
+    }
+    
+    while (I2C_I2C_STATUS_0 & 0xF) {
+        /* Wait until write successful. */
+    }
+}
+
+/* Writes a byte val to reg for given device. */
+void i2c_send_byte_command(unsigned int device, unsigned char reg, unsigned char b) {
+    uint32_t val = (reg) | (b << 8);
+    /* Write 1 byte (reg) + 1 byte (value) */
+    i2c_write(device, val, 2);
+}
+
+/* Enable the PMIC. */
+void i2c_enable_pmic(void) {
+    /* Write 00 to Device 27 Reg 00. */
+    i2c_send_byte_command(27, 0, 0x80);
+}

exosphere/lp0fw/src/i2c.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2018 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
+#ifndef EXOSPHERE_WARMBOOT_BIN_I2C_H
+#define EXOSPHERE_WARMBOOT_BIN_I2C_H
+
+#include "utils.h"
+
+/* I2C_BASE = I2C5. */
+#define I2C_BASE (0x7000D000)
+
+#define MAKE_I2C_REG(ofs) (MAKE_REG32(I2C_BASE + ofs))
+
+#define I2C_I2C_CNFG_0                       MAKE_I2C_REG(0x000)
+
+#define I2C_I2C_CMD_ADDR0_0                  MAKE_I2C_REG(0x004)
+
+#define I2C_I2C_CMD_DATA1_0                  MAKE_I2C_REG(0x00C)
+
+#define I2C_I2C_STATUS_0                     MAKE_I2C_REG(0x01C)
+
+#define I2C_INTERRUPT_STATUS_REGISTER_0      MAKE_I2C_REG(0x068)
+
+#define I2C_I2C_CLK_DIVISOR_REGISTER_0       MAKE_I2C_REG(0x06C)
+
+#define I2C_I2C_BUS_CLEAR_CONFIG_0           MAKE_I2C_REG(0x084)
+
+#define I2C_I2C_BUS_CLEAR_STATUS_0           MAKE_I2C_REG(0x088)
+
+
+#define I2C_I2C_CONFIG_LOAD_0                MAKE_I2C_REG(0x08C)
+
+void i2c_enable_pmic(void);
+
+#endif