iPod Classic: HW preliminary initialization for bootloader

When the bootloader starts, most of HW never has been initialized.
This patch includes all code needed to perform the preliminary
initialization on SYSCON, GPIO, i2c, and MIU.

The code is based on emCORE and OF reverse engineering, ported to
C for readability.

Change-Id: I9ecf2c3e8b1b636241a211dbba8735137accd05c

1 files changed, 109 insertions, 0 deletions

diff --git a/firmware/target/arm/s5l8702/ipod6g/pmu-ipod6g.c b/firmware/target/arm/s5l8702/ipod6g/pmu-ipod6g.c
index 2a9236046c..9c3ec8e711 100644
--- a/firmware/target/arm/s5l8702/ipod6g/pmu-ipod6g.c
+++ b/firmware/target/arm/s5l8702/ipod6g/pmu-ipod6g.c
@@ -165,4 +165,113 @@ int pmu_wr(int address, unsigned char val)
 {
     return pmu_wr_multiple(address, 1, &val);
 }
+
+void pmu_preinit(void)
+{
+    static const char init_data[] =
+    {
+        /* reset OOC shutdown register */
+        PCF5063X_REG_OOCSHDWN,  0x0,
+
+        /* LDO_UNK1: 3000 mV, enabled */
+        PCF5063X_REG_LDO1OUT,   0x15,
+        PCF5063X_REG_LDO1ENA,   0x1,
+
+        /* LDO_UNK2: 3000 mV, enabled */
+        PCF5063X_REG_LDO2OUT,   0x15,
+        PCF5063X_REG_LDO2ENA,   0x1,
+
+        /* LDO_LCD: 3000 mV, enabled */
+        PCF5063X_REG_LDO3OUT,   0x15,
+        PCF5063X_REG_LDO3ENA,   0x1,
+
+        /* LDO_CODEC: 1800 mV, enabled */
+        PCF5063X_REG_LDO4OUT,   0x9,
+        PCF5063X_REG_LDO4ENA,   0x1,
+
+        /* LDO_UNK5: 3000 mV, disabled */
+        PCF5063X_REG_LDO5OUT,   0x15,
+        PCF5063X_REG_LDO5ENA,   0x0,
+
+        /* LDO_CWHEEL: 3000 mV, ON when GPIO2 High */
+        PCF5063X_REG_LDO6OUT,   0x15,
+        PCF5063X_REG_LDO6ENA,   0x4,
+
+        /* LDO_ACCY: 3300 mV, disabled */
+        PCF5063X_REG_HCLDOOUT,  0x18,
+        PCF5063X_REG_HCLDOENA,  0x0,
+
+        /* LDO_CWHEEL is ON in STANDBY state,
+           LDO_CWHEEL and MEMLDO are ON in UNKNOWN state (TBC) */
+        PCF5063X_REG_STBYCTL1,  0x0,
+        PCF5063X_REG_STBYCTL2,  0x8c,
+
+        /* GPIO1,2 = input, GPIO3 = output */
+        PCF5063X_REG_GPIOCTL,   0x3,
+        PCF5063X_REG_GPIO1CFG,  0x0,
+        PCF5063X_REG_GPIO2CFG,  0x0,
+
+        /* DOWN2 converter (SDRAM): 1800 mV, enabled,
+           startup current limit = 15mA*0x10 (TBC) */
+        PCF5063X_REG_DOWN2OUT,  0x2f,
+        PCF5063X_REG_DOWN2ENA,  0x1,
+        PCF5063X_REG_DOWN2CTL,  0x0,
+        PCF5063X_REG_DOWN2MXC,  0x10,
+
+        /* MEMLDO: 1800 mV, enabled */
+        PCF5063X_REG_MEMLDOOUT, 0x9,
+        PCF5063X_REG_MEMLDOENA, 0x1,
+
+        /* AUTOLDO (HDD): 3400 mV, disabled,
+           limit = 1000 mA (40mA*0x19), limit always active */
+        PCF5063X_REG_AUTOOUT,   0x6f,
+        PCF5063X_REG_AUTOENA,   0x0,
+        PCF5063X_REG_AUTOCTL,   0x0,
+        PCF5063X_REG_AUTOMXC,   0x59,
+
+        /* Vsysok = 3100 mV */
+        PCF5063X_REG_SVMCTL,    0x8,
+
+        /* Reserved */
+        0x58,                   0x0,
+
+        /* Mask all PMU interrupts */
+        PCF5063X_REG_INT1M,     0xff,
+        PCF5063X_REG_INT2M,     0xff,
+        PCF5063X_REG_INT3M,     0xff,
+        PCF5063X_REG_INT4M,     0xff,
+        PCF5063X_REG_INT5M,     0xff,
+        PCF50635_REG_INT6M,     0xff,
+
+        /* Wakeup on rising edge for EXTON1 and EXTON2,
+           wakeup on falling edge for EXTON3 and !ONKEY,
+           wakeup on RTC alarm, wakeup on adapter insert,
+           Vbat status has no effect in state machine */
+        PCF5063X_REG_OOCWAKE,   0xdf,
+        PCF5063X_REG_OOCTIM1,   0xaa,
+        PCF5063X_REG_OOCTIM2,   0x4a,
+        PCF5063X_REG_OOCMODE,   0x5,
+        PCF5063X_REG_OOCCTL,    0x27,
+
+        /* GPO selection = LED external NFET drive signal */
+        PCF5063X_REG_GPOCFG,    0x1,
+        /* LED converter OFF, overvoltage protection enabled,
+           OCP limit is 500 mA, led_dimstep = 16*0x6/32768 */
+        PCF5063X_REG_LEDENA,    0x0,
+        PCF5063X_REG_LEDCTL,    0x5,
+        PCF5063X_REG_LEDDIM,    0x6,
+
+        /* end marker */
+        0
+    };
+
+    const char* ptr;
+    for (ptr = init_data; *ptr != 0; ptr += 2)
+        pmu_wr(ptr[0], ptr[1]);
+
+    /* clear PMU interrupts */
+    unsigned char rd_buf[5];
+    pmu_rd_multiple(PCF5063X_REG_INT1, 5, rd_buf);
+    pmu_rd(PCF50635_REG_INT6);
+}
 #endif /* BOOTLOADER */