Commit 5d0c3533 authored by Vinod Koul's avatar Vinod Koul
Browse files

dmaengine: qcom: Add GPI dma driver 

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: default avatarVinod Koul <vkoul@kernel.org>
parent e7bbb7ac

drivers/dma/qcom/Kconfig

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@@ -19,6 +19,18 @@ config QCOM_BAM_DMA 
	  Enable support for the QCOM BAM DMA controller.  This controller

	  provides DMA capabilities for a variety of on-chip devices.



config QCOM_GPI_DMA

        tristate "Qualcomm Technologies GPI DMA support"

        depends on ARCH_QCOM

        select DMA_ENGINE

        select DMA_VIRTUAL_CHANNELS

        help

          Enable support for the QCOM GPI DMA controller. This controller

          provides DMA 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 DDR and peripheral.



config QCOM_HIDMA_MGMT

	tristate "Qualcomm Technologies HIDMA Management support"

	select DMA_ENGINE

drivers/dma/qcom/Makefile

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# SPDX-License-Identifier: GPL-2.0

obj-$(CONFIG_QCOM_ADM) += qcom_adm.o

obj-$(CONFIG_QCOM_BAM_DMA) += bam_dma.o

obj-$(CONFIG_QCOM_GPI_DMA) += gpi.o

obj-$(CONFIG_QCOM_HIDMA_MGMT) += hdma_mgmt.o

hdma_mgmt-objs	 := hidma_mgmt.o hidma_mgmt_sys.o

obj-$(CONFIG_QCOM_HIDMA) +=  hdma.o

drivers/dma/qcom/gpi.c

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File added.

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include/linux/dma/qcom-gpi-dma.h

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/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (c) 2020, Linaro Limited

 */



#ifndef QCOM_GPI_DMA_H

#define QCOM_GPI_DMA_H



/**

 * enum spi_transfer_cmd - spi transfer commands

 */

enum spi_transfer_cmd {

	SPI_TX = 1,

	SPI_RX,

	SPI_DUPLEX,

};



/**

 * struct gpi_spi_config - spi config for peripheral

 *

 * @loopback_en: spi loopback enable when set

 * @clock_pol_high: clock polarity

 * @data_pol_high: data polarity

 * @pack_en: process tx/rx buffers as packed

 * @word_len: spi word length

 * @clk_div: source clock divider

 * @clk_src: serial clock

 * @cmd: spi cmd

 * @fragmentation: keep CS assserted at end of sequence

 * @cs: chip select toggle

 * @set_config: set peripheral config

 * @rx_len: receive length for buffer

 */

struct gpi_spi_config {

	u8 set_config;

	u8 loopback_en;

	u8 clock_pol_high;

	u8 data_pol_high;

	u8 pack_en;

	u8 word_len;

	u8 fragmentation;

	u8 cs;

	u32 clk_div;

	u32 clk_src;

	enum spi_transfer_cmd cmd;

	u32 rx_len;

};



enum i2c_op {

	I2C_WRITE = 1,

	I2C_READ,

};



/**

 * struct gpi_i2c_config - i2c config for peripheral

 *

 * @pack_enable: process tx/rx buffers as packed

 * @cycle_count: clock cycles to be sent

 * @high_count: high period of clock

 * @low_count: low period of clock

 * @clk_div: source clock divider

 * @addr: i2c bus address

 * @stretch: stretch the clock at eot

 * @set_config: set peripheral config

 * @rx_len: receive length for buffer

 * @op: i2c cmd

 * @muli-msg: is part of multi i2c r-w msgs

 */

struct gpi_i2c_config {

	u8 set_config;

	u8 pack_enable;

	u8 cycle_count;

	u8 high_count;

	u8 low_count;

	u8 addr;

	u8 stretch;

	u16 clk_div;

	u32 rx_len;

	enum i2c_op op;

	bool multi_msg;

};



#endif /* QCOM_GPI_DMA_H */