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