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5d0c3533a1
This controller provides DMAengine capabilities for a variety of peripheral buses such as I2C, UART, and SPI. By using GPI dmaengine driver, bus drivers can use a standardize interface that is protocol independent to transfer data between memory and peripheral. Link: https://lore.kernel.org/r/20201109085450.24843-4-vkoul@kernel.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2020, Linaro Limited
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*/
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#ifndef QCOM_GPI_DMA_H
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#define QCOM_GPI_DMA_H
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/**
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* enum spi_transfer_cmd - spi transfer commands
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*/
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enum spi_transfer_cmd {
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SPI_TX = 1,
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SPI_RX,
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SPI_DUPLEX,
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};
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/**
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* struct gpi_spi_config - spi config for peripheral
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*
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* @loopback_en: spi loopback enable when set
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* @clock_pol_high: clock polarity
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* @data_pol_high: data polarity
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* @pack_en: process tx/rx buffers as packed
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* @word_len: spi word length
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* @clk_div: source clock divider
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* @clk_src: serial clock
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* @cmd: spi cmd
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* @fragmentation: keep CS assserted at end of sequence
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* @cs: chip select toggle
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* @set_config: set peripheral config
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* @rx_len: receive length for buffer
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*/
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struct gpi_spi_config {
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u8 set_config;
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u8 loopback_en;
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u8 clock_pol_high;
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u8 data_pol_high;
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u8 pack_en;
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u8 word_len;
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u8 fragmentation;
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u8 cs;
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u32 clk_div;
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u32 clk_src;
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enum spi_transfer_cmd cmd;
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u32 rx_len;
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};
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enum i2c_op {
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I2C_WRITE = 1,
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I2C_READ,
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};
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/**
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* struct gpi_i2c_config - i2c config for peripheral
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*
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* @pack_enable: process tx/rx buffers as packed
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* @cycle_count: clock cycles to be sent
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* @high_count: high period of clock
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* @low_count: low period of clock
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* @clk_div: source clock divider
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* @addr: i2c bus address
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* @stretch: stretch the clock at eot
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* @set_config: set peripheral config
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* @rx_len: receive length for buffer
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* @op: i2c cmd
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* @muli-msg: is part of multi i2c r-w msgs
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*/
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struct gpi_i2c_config {
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u8 set_config;
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u8 pack_enable;
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u8 cycle_count;
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u8 high_count;
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u8 low_count;
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u8 addr;
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u8 stretch;
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u16 clk_div;
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u32 rx_len;
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enum i2c_op op;
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bool multi_msg;
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};
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#endif /* QCOM_GPI_DMA_H */
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