first and last commit

drivers/apple/dwi/dwi.c

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+/*
+ * Copyright (C) 2011 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 <platform.h>
+#include <platform/clocks.h>
+#include <platform/soc/hwclocks.h>
+
+#include "dwi.h"
+
+#ifndef TARGET_DWI_FREQUENCY
+#error TARGET_DWI_FREQUENCY not defined by the target
+#endif
+
+#ifndef TARGET_DWI_TRANSFER_GAP_US
+#error TARGET_DWI_TRANSFER_GAP_US not defined by the target
+#endif
+
+int dwi_init(void)
+{
+	u_int32_t dwi_divider, dwi_transfer_gap;
+
+	clock_gate(CLK_DWI, true);
+
+	dwi_divider = (clock_get_frequency(CLK_NCLK) + TARGET_DWI_FREQUENCY - 1) / TARGET_DWI_FREQUENCY;
+	dwi_transfer_gap = (clock_get_frequency(CLK_NCLK) * TARGET_DWI_TRANSFER_GAP_US) / 1000000;
+
+	rDWI_CLOCK_CONFIG = DWI_CLOCK_CONFIG_CLOCK_SCALER(dwi_divider) | DWI_CLOCK_CONFIG_TX_CPHA_1;
+	rDWI_TRANSFER_GAP = dwi_transfer_gap;
+
+	return 0;
+}
+
+int dwi_send_backlight_command(uint32_t backlight_command, uint32_t backlight_level)
+{
+	rDWI_ITR0_TX_DATA = (backlight_command << 28) | (backlight_level & 0x7FF);
+	rDWI_ITR0_CONTROL = DWI_TR_CTRL_BYTE_SWAP | DWI_TR_CTRL_BYTE_CNT(4) | DWI_TR_CTRL_TRAN_EN | DWI_TR_CTRL_SLAVE_DWI;
+
+	return 0;
+}

drivers/apple/dwi/dwi.h

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+/*
+ * Copyright (C) 2014-2015 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.
+ */
+
+#ifndef __APPLE_DWI_H
+#define __APPLE_DWI_H
+
+#include <platform/soc/hwregbase.h>
+#include SUB_PLATFORM_SPDS_HEADER(dwi)
+
+#define rDWI_CLOCK_CONFIG		(*(volatile u_int32_t *)(DWI_BASE_ADDR + DWI_BLK_CLOCK_CONFIG_OFFSET))
+#define  DWI_CLOCK_CONFIG_TX_CPHA_1	(DWI_BLK_CLOCK_CONFIG_TX_CPHA_INSRT(1) << 0)
+#define  DWI_CLOCK_CONFIG_TX_CPHA_2	(DWI_BLK_CLOCK_CONFIG_TX_CPHA_INSRT(0) << 0)
+#define  DWI_CLOCK_CONFIG_RX_CPHA_1	(DWI_BLK_CLOCK_CONFIG_TX_CPHA_INSRT(1) << 1)
+#define  DWI_CLOCK_CONFIG_RX_CPHA_2	(DWI_BLK_CLOCK_CONFIG_TX_CPHA_INSRT(0) << 1)
+#define  DWI_CLOCK_CONFIG_CPOL_LOW	(DWI_BLK_CLOCK_CONFIG_CPOL_INSRT(0) << 2)
+#define  DWI_CLOCK_CONFIG_CPOL_HIGH	(DWI_BLK_CLOCK_CONFIG_CPOL_INSRT(1) << 2)
+#define  DWI_CLOCK_CONFIG_CLOCK_SCALER(_x)	(DWI_BLK_CLOCK_CONFIG_CLOCK_SCALER_INSRT(_x - 1))
+#define rDWI_TRANSFER_GAP		(*(volatile u_int32_t *)(DWI_BASE_ADDR + DWI_BLK_TRANSFER_GAP_OFFSET))
+#define rDWI_ITR0_CONTROL		(*(volatile u_int32_t *)(DWI_BASE_ADDR + DWI_BLK_ITR0_CONTROL_OFFSET))
+#define  DWI_TR_CTRL_TRAN_EN		(1 << DWI_BLK_ITR0_CONTROL_ITR0_TRAN_EN_SHIFT)
+#define  DWI_TR_CTRL_BYTE_CNT(_c)	(DWI_BLK_ITR0_CONTROL_ITR0_BYTE_COUNT_INSRT(_c - 1))
+#define  DWI_TR_CTRL_BYTE_SWAP		(1 << DWI_BLK_ITR0_CONTROL_ITR0_BYTE_SWAP_SHIFT)
+#define  DWI_TR_CTRL_BIT_ORDER		(1 << DWI_BLK_ITR0_CONTROL_ITR0_BIT_ORDER_SHIFT)
+#define  DWI_TR_CTRL_SLAVE_PSPI		(DWI_BLK_ITR0_CONTROL_SLAVE_SEL_INSRT(0))
+#define  DWI_TR_CTRL_SLAVE_DWI		(DWI_BLK_ITR0_CONTROL_SLAVE_SEL_INSRT(1))
+#define rDWI_ITR0_TX_DATA		(*(volatile u_int32_t *)(DWI_BASE_ADDR + DWI_BLK_ITR0_TX_DATA_OFFSET))
+
+#endif /* ! __APPLE_DWI_H */

drivers/apple/dwi/rules.mk

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+# Copyright (C) 2011 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_DWI=1
+
+ALL_OBJS += $(LOCAL_DIR)/dwi.o