iPod Classic: HW initialization for RB

Do not rely on a bootloader initializing the HW, RB initializes
and configures GPIO, I2C, and PMU at startup.

Change-Id: If7f856b1f345f63de584aa4e4fc22d130cd66c80

firmware/export/i2c-s5l8702.h

@@ -28,10 +28,8 @@ void i2c_init(void);
 int i2c_write(int bus, unsigned char slave, int address, int len, const unsigned char *data);
 int i2c_read(int bus, unsigned char slave, int address, int len, unsigned char *data);
 
-#ifdef BOOTLOADER
 void i2c_preinit(int bus);
 int i2c_wr(int bus, unsigned char slave, int address, int len, const unsigned char *data);
 int i2c_rd(int bus, unsigned char slave, int address, int len, unsigned char *data);
-#endif
 
 #endif /* _I2C_S5l8702_H */

firmware/target/arm/s5l8702/clocking-s5l8702.c

@@ -213,6 +213,14 @@ void set_clocking_level(int level)
     udelay(50); /* TBC: probably not needed */
 }
 
+void clockgate_enable(int gate, bool enable)
+{
+    int i = (gate >> 5) & 1;
+    uint32_t bit = 1 << (gate & 0x1f);
+    if (enable) PWRCON(i) &= ~bit;
+    else PWRCON(i) |= bit;
+}
+
 #ifdef BOOTLOADER
 int pll_config(int pll, int op_mode, int p, int m, int s, int lock_time)
 {
@@ -299,14 +307,6 @@ void cg16_config(volatile uint16_t* cg16,
     while (*cg16 != val16);
 }
 
-void clockgate_enable(int gate, bool enable)
-{
-    int i = (gate >> 5) & 1;
-    uint32_t bit = 1 << (gate & 0x1f);
-    if (enable) PWRCON(i) &= ~bit;
-    else PWRCON(i) |= bit;
-}
-
 /* Configures EClk for USEC_TIMER. DRAM refresh also depends on EClk,
  * this clock should be initialized by the bootloader, so USEC_TIMER
  * is ready to use for RB.

firmware/target/arm/s5l8702/clocking-s5l8702.h

@@ -426,6 +426,7 @@ struct clocking_mode
 void clocking_init(struct clocking_mode *modes, int init_level);
 void set_clocking_level(int level);
 unsigned get_system_freqs(unsigned *cclk, unsigned *hclk, unsigned *pclk);
+void clockgate_enable(int gate, bool enable);
 
 /* debug */
 unsigned pll_get_cfg_freq(int pll);
@@ -437,7 +438,6 @@ int soc_get_hsdiv(void);
 #include <stdbool.h>
 
 void usec_timer_init(void);
-void clockgate_enable(int gate, bool enable);
 
 void soc_set_system_divs(unsigned cdiv, unsigned hdiv, unsigned hprat);
 unsigned soc_get_system_divs(unsigned *cdiv, unsigned *hdiv, unsigned *pdiv);

firmware/target/arm/s5l8702/gpio-s5l8702.c

@@ -215,7 +215,6 @@ void ICODE_ATTR INT_EXT6(void)
 }
 #endif
 
-#ifdef BOOTLOADER
 static uint32_t gpio_data[16] =
 {
     0x5322222F, 0xEEEEEE00, 0x2332EEEE, 0x3333E222,
@@ -232,4 +231,3 @@ void gpio_preinit(void)
         PUNC(i) = 0;
     }
 }
-#endif

firmware/target/arm/s5l8702/gpio-s5l8702.h

@@ -142,8 +142,6 @@ void gpio_int_disable(int gpio_n);
 uint32_t gpio_group_get(int group);
 void gpio_group_set(int group, uint32_t mask, uint32_t cfg);
 
-#ifdef BOOTLOADER
 void gpio_preinit(void);
-#endif
 
 #endif /* __GPIO_S5L8702_H__ */

firmware/target/arm/s5l8702/i2c-s5l8702.c

@@ -23,6 +23,7 @@
 #include "system.h"
 #include "kernel.h"
 #include "i2c-s5l8702.h"
+#include "clocking-s5l8702.h"
 
 /*  Driver for the s5l8700 built-in I2C controller in master mode
     
@@ -180,9 +181,6 @@ int i2c_read(int bus, unsigned char slave, int address, int len, unsigned char *
     return ret;
 }
 
-#ifdef BOOTLOADER
-#include "clocking-s5l8702.h"
-
 static void wait_rdy(int bus)
 {
     while (IICUNK10(bus));
@@ -206,4 +204,3 @@ void i2c_preinit(int bus)
     wait_rdy(bus);
     clockgate_enable(I2CCLKGATE(bus), false);
 }
-#endif

firmware/target/arm/s5l8702/ipod6g/pmu-ipod6g.c

@@ -143,7 +143,9 @@ void pmu_write_rtc(unsigned char* buffer)
     pmu_write_multiple(0x59, 7, buffer);
 }
 
-#ifdef BOOTLOADER
+/*
+ * preinit
+ */
 int pmu_rd_multiple(int address, int count, unsigned char* buffer)
 {
     return i2c_rd(0, 0xe6, address, count, buffer);
@@ -225,7 +227,9 @@ void pmu_preinit(void)
         /* AUTOLDO (HDD): 3400 mV, disabled,
            limit = 1000 mA (40mA*0x19), limit always active */
         PCF5063X_REG_AUTOOUT,   0x6f,
+#ifdef BOOTLOADER
         PCF5063X_REG_AUTOENA,   0x0,
+#endif
         PCF5063X_REG_AUTOCTL,   0x0,
         PCF5063X_REG_AUTOMXC,   0x59,
 
@@ -257,7 +261,9 @@ void pmu_preinit(void)
         PCF5063X_REG_GPOCFG,    0x1,
         /* LED converter OFF, overvoltage protection enabled,
            OCP limit is 500 mA, led_dimstep = 16*0x6/32768 */
+#ifdef BOOTLOADER
         PCF5063X_REG_LEDENA,    0x0,
+#endif
         PCF5063X_REG_LEDCTL,    0x5,
         PCF5063X_REG_LEDDIM,    0x6,
 
@@ -274,4 +280,3 @@ void pmu_preinit(void)
     pmu_rd_multiple(PCF5063X_REG_INT1, 5, rd_buf);
     pmu_rd(PCF50635_REG_INT6);
 }
-#endif /* BOOTLOADER */

firmware/target/arm/s5l8702/ipod6g/pmu-target.h

@@ -77,12 +77,12 @@ void pmu_read_rtc(unsigned char* buffer);
 void pmu_write_rtc(unsigned char* buffer);
 void pmu_hdd_power(bool on);
 
+void pmu_preinit(void);
 #ifdef BOOTLOADER
 unsigned char pmu_rd(int address);
 int pmu_wr(int address, unsigned char val);
 int pmu_rd_multiple(int address, int count, unsigned char* buffer);
 int pmu_wr_multiple(int address, int count, unsigned char* buffer);
-void pmu_preinit(void);
 #endif
 
 #endif /* __PMU_TARGET_H__ */

firmware/target/arm/s5l8702/system-s5l8702.c

@@ -23,6 +23,7 @@
 #include "system.h"
 #include "panic.h"
 #include "system-target.h"
+#include "i2c-s5l8702.h"
 #include "pmu-target.h"
 #include "uart-target.h"
 #include "gpio-s5l8702.h"
@@ -199,6 +200,11 @@ enum {
 void system_init(void)
 {
     clocking_init(clk_modes, 0);
+#ifndef BOOTLOADER
+    gpio_preinit();
+    i2c_preinit(0);
+    pmu_preinit();
+#endif
     gpio_init();
     pmu_init();
     dma_init();
@@ -279,7 +285,7 @@ void memory_init(void)
 }
 
 #ifdef BOOTLOADER
-#include "i2c-s5l8702.h"
+#include <stdbool.h>
 
 static void syscon_preinit(void)
 {