first and last commit

drivers/display_pmu/chestnut/chestnut.c

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+/*
+ * Copyright (C) 2012-2013 Apple Inc. All rights reserved.
+ *
+ * This document is the property of Apple Inc.
+ * It is considered confidential and proprietary.
+ *
+ * This document may not be reproduced or transmitted in any form,
+ * in whole or in part, without the express written permission of
+ * Apple Inc.
+ */
+#include <debug.h>
+#include <drivers/iic.h>
+#include <drivers/display_pmu.h>
+#include <lib/devicetree.h>
+#include <target/gpiodef.h>
+#include <target.h>
+
+#define IIC_ADDRESS		(0x4E)
+
+#define DEVICE_ID_0		(0x00)
+#define DEVICE_ID_1		(0x01)
+#define DEVICE_ID_2		(0x02)
+#define REVISION		(0x03)
+#define STATUS			(0x04)
+#define ENABLE			(0x05)
+#define VNEG_CONTROL		(0x0F)
+
+#define TI_DEVICE_ID0		(0x007365)
+#define TI_DEVICE_ID1		(0x00F365)
+#define INTERSIL_DEVICE_ID	(0x0BA46E)
+
+uint32_t	chestnut_device_id;
+uint8_t 	chestnut_device_revision;
+bool		chestnut_probed;
+bool		chestnut_present;
+
+static const char *chestnut_device_string(uint32_t device_id)
+{
+	switch (device_id) {
+		case TI_DEVICE_ID0:
+		case TI_DEVICE_ID1:
+			return "TI";
+
+		case INTERSIL_DEVICE_ID:
+			return "Intersil";
+	}
+
+	return "Unknown";
+}
+
+static void chestnut_probe()
+{
+	if (!chestnut_probed) {
+		// Probe by reading a register
+		uint8_t data[4] = { 0 };
+
+		data[0] = REVISION;
+		if (iic_read(DISPLAY_PMU_IIC_BUS, IIC_ADDRESS, (const void *)data, 1, (void *)(data + 1), 1, IIC_NORMAL) == 0) {
+			chestnut_device_revision = data[1];
+
+			data[0] = DEVICE_ID_0;
+			if (iic_read(DISPLAY_PMU_IIC_BUS, IIC_ADDRESS, (const void *)data, 1, (void *)(data + 1), 3, IIC_NORMAL) == 0)
+				chestnut_device_id = (data[1] << 16) | (data[2] << 8) | data[3];
+
+			chestnut_present = true;
+		}
+
+		chestnut_probed = true;
+	}
+
+	if (chestnut_present)
+		dprintf(DEBUG_CRITICAL, "Display PMU found, 0x%08x, %s-%02x\n", chestnut_device_id, chestnut_device_string(chestnut_device_id), chestnut_device_revision);
+	else
+		dprintf(DEBUG_INFO, "Display PMU probe failed\n");
+}
+
+#if TARGET_CHESTNUT_USE_LOW_RIPPLE_MODE && !defined(TARGET_CHESTNUT_VNEG_CONTROL)
+#define TARGET_CHESTNUT_VNEG_CONTROL 0x07
+#endif
+
+int display_pmu_init(void)
+{
+	chestnut_probe();
+
+	if (chestnut_present) {
+		uint8_t data[2];
+
+#if defined(TARGET_CHESTNUT_VNEG_CONTROL)
+		// Set low-ripple mode for VNEG
+		// <rdar://problem/12983634> N5x | Set low-ripple mode in Chestnut before Chestnut rails are enabled
+		data[0] = VNEG_CONTROL;
+		data[1] = TARGET_CHESTNUT_VNEG_CONTROL;
+		RELEASE_ASSERT(iic_write(DISPLAY_PMU_IIC_BUS, IIC_ADDRESS, data, 2) == 0);
+#endif
+
+		// Enable power to the panel
+		data[0] = ENABLE;
+		data[1] = 0x3;				// Enable Boost (VNEG and VPOS LDOs)
+		data[1] |= target_get_lcm_ldos();
+		RELEASE_ASSERT(iic_write(DISPLAY_PMU_IIC_BUS, IIC_ADDRESS, data, 2) == 0);
+
+		return 0;
+	}
+
+	return -1;
+}
+
+int display_pmu_quiesce(void)
+{
+	if (chestnut_present) {
+		uint8_t data[2];
+
+		// Disable power to the panel
+		data[0] = ENABLE;
+		data[1] = 0;
+		RELEASE_ASSERT(iic_write(DISPLAY_PMU_IIC_BUS, IIC_ADDRESS, data, 2) == 0);
+
+		return 0;
+	}
+
+	return -1;
+}
+
+#if WITH_DEVICETREE
+void display_pmu_update_device_tree(const char *node_string)
+{
+        uint32_t propSize;
+        char *propName;
+        void *propData;
+	DTNode *node;
+
+	if (!chestnut_present)
+		return;
+
+	// Find display-pmu node
+	if (FindNode(0, node_string, &node)) {
+		// Fill in the probed device info
+
+		propName = "device-id";
+		if (FindProperty(node, &propName, &propData, &propSize))
+			if (propSize >= sizeof(chestnut_device_id))
+				*(uint32_t *)propData = chestnut_device_id;
+
+		propName = "device-revision";
+		if (FindProperty(node, &propName, &propData, &propSize))
+			if (propSize >= sizeof(chestnut_device_revision))
+				*(uint32_t *)propData = chestnut_device_revision;
+
+		propName = "device-string";
+		if (FindProperty(node, &propName, &propData, &propSize)) {
+			bzero(propData, propSize);
+			strlcpy(propData, chestnut_device_string(chestnut_device_id), propSize);
+		}
+	}
+}
+#endif

drivers/display_pmu/chestnut/rules.mk

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+# Copyright (C) 2012 Apple Inc. All rights reserved.
+#
+# This document is the property of Apple Inc.
+# It is considered confidential and proprietary.
+#
+# This document may not be reproduced or transmitted in any form,
+# in whole or in part, without the express written permission of
+# Apple Inc.
+#
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+OPTIONS += \
+	WITH_HW_DISPLAY_PMU=1 \
+	WITH_HW_CHESTNUT=1
+
+ALL_OBJS += \
+	$(LOCAL_DIR)/chestnut.o