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