Source of spi-dln2.c - linux-imx - PHYTEC BitBucket (Stash)

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 * Ex: cs_mask = 0x03 -> CS0 & CS1 will be selected and the next WR/RD operation
 
/* * Driver for the Diolan DLN-2 USB-SPI adapter * * Copyright (c) 2014 Intel Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2. */​#include <linux/kernel.h>#include <linux/module.h>#include <linux/platform_device.h>#include <linux/mfd/dln2.h>#include <linux/spi/spi.h>#include <linux/pm_runtime.h>#include <asm/unaligned.h>​#define DLN2_SPI_MODULE_ID      0x02#define DLN2_SPI_CMD(cmd)       DLN2_CMD(cmd, DLN2_SPI_MODULE_ID)​/* SPI commands */#define DLN2_SPI_GET_PORT_COUNT         DLN2_SPI_CMD(0x00)#define DLN2_SPI_ENABLE             DLN2_SPI_CMD(0x11)#define DLN2_SPI_DISABLE            DLN2_SPI_CMD(0x12)#define DLN2_SPI_IS_ENABLED         DLN2_SPI_CMD(0x13)#define DLN2_SPI_SET_MODE           DLN2_SPI_CMD(0x14)#define DLN2_SPI_GET_MODE           DLN2_SPI_CMD(0x15)#define DLN2_SPI_SET_FRAME_SIZE         DLN2_SPI_CMD(0x16)#define DLN2_SPI_GET_FRAME_SIZE         DLN2_SPI_CMD(0x17)#define DLN2_SPI_SET_FREQUENCY          DLN2_SPI_CMD(0x18)#define DLN2_SPI_GET_FREQUENCY          DLN2_SPI_CMD(0x19)#define DLN2_SPI_READ_WRITE         DLN2_SPI_CMD(0x1A)#define DLN2_SPI_READ               DLN2_SPI_CMD(0x1B)#define DLN2_SPI_WRITE              DLN2_SPI_CMD(0x1C)#define DLN2_SPI_SET_DELAY_BETWEEN_SS       DLN2_SPI_CMD(0x20)#define DLN2_SPI_GET_DELAY_BETWEEN_SS       DLN2_SPI_CMD(0x21)#define DLN2_SPI_SET_DELAY_AFTER_SS     DLN2_SPI_CMD(0x22)#define DLN2_SPI_GET_DELAY_AFTER_SS     DLN2_SPI_CMD(0x23)#define DLN2_SPI_SET_DELAY_BETWEEN_FRAMES   DLN2_SPI_CMD(0x24)#define DLN2_SPI_GET_DELAY_BETWEEN_FRAMES   DLN2_SPI_CMD(0x25)#define DLN2_SPI_SET_SS             DLN2_SPI_CMD(0x26)#define DLN2_SPI_GET_SS             DLN2_SPI_CMD(0x27)#define DLN2_SPI_RELEASE_SS         DLN2_SPI_CMD(0x28)#define DLN2_SPI_SS_VARIABLE_ENABLE     DLN2_SPI_CMD(0x2B)#define DLN2_SPI_SS_VARIABLE_DISABLE        DLN2_SPI_CMD(0x2C)#define DLN2_SPI_SS_VARIABLE_IS_ENABLED     DLN2_SPI_CMD(0x2D)#define DLN2_SPI_SS_AAT_ENABLE          DLN2_SPI_CMD(0x2E)#define DLN2_SPI_SS_AAT_DISABLE         DLN2_SPI_CMD(0x2F)#define DLN2_SPI_SS_AAT_IS_ENABLED      DLN2_SPI_CMD(0x30)#define DLN2_SPI_SS_BETWEEN_FRAMES_ENABLE   DLN2_SPI_CMD(0x31)#define DLN2_SPI_SS_BETWEEN_FRAMES_DISABLE  DLN2_SPI_CMD(0x32)#define DLN2_SPI_SS_BETWEEN_FRAMES_IS_ENABLED   DLN2_SPI_CMD(0x33)#define DLN2_SPI_SET_CPHA           DLN2_SPI_CMD(0x34)#define DLN2_SPI_GET_CPHA           DLN2_SPI_CMD(0x35)#define DLN2_SPI_SET_CPOL           DLN2_SPI_CMD(0x36)#define DLN2_SPI_GET_CPOL           DLN2_SPI_CMD(0x37)#define DLN2_SPI_SS_MULTI_ENABLE        DLN2_SPI_CMD(0x38)#define DLN2_SPI_SS_MULTI_DISABLE       DLN2_SPI_CMD(0x39)#define DLN2_SPI_SS_MULTI_IS_ENABLED        DLN2_SPI_CMD(0x3A)#define DLN2_SPI_GET_SUPPORTED_MODES        DLN2_SPI_CMD(0x40)#define DLN2_SPI_GET_SUPPORTED_CPHA_VALUES  DLN2_SPI_CMD(0x41)#define DLN2_SPI_GET_SUPPORTED_CPOL_VALUES  DLN2_SPI_CMD(0x42)#define DLN2_SPI_GET_SUPPORTED_FRAME_SIZES  DLN2_SPI_CMD(0x43)#define DLN2_SPI_GET_SS_COUNT           DLN2_SPI_CMD(0x44)#define DLN2_SPI_GET_MIN_FREQUENCY      DLN2_SPI_CMD(0x45)#define DLN2_SPI_GET_MAX_FREQUENCY      DLN2_SPI_CMD(0x46)#define DLN2_SPI_GET_MIN_DELAY_BETWEEN_SS   DLN2_SPI_CMD(0x47)#define DLN2_SPI_GET_MAX_DELAY_BETWEEN_SS   DLN2_SPI_CMD(0x48)#define DLN2_SPI_GET_MIN_DELAY_AFTER_SS     DLN2_SPI_CMD(0x49)#define DLN2_SPI_GET_MAX_DELAY_AFTER_SS     DLN2_SPI_CMD(0x4A)#define DLN2_SPI_GET_MIN_DELAY_BETWEEN_FRAMES   DLN2_SPI_CMD(0x4B)#define DLN2_SPI_GET_MAX_DELAY_BETWEEN_FRAMES   DLN2_SPI_CMD(0x4C)​#define DLN2_SPI_MAX_XFER_SIZE          256#define DLN2_SPI_BUF_SIZE           (DLN2_SPI_MAX_XFER_SIZE + 16)#define DLN2_SPI_ATTR_LEAVE_SS_LOW      BIT(0)#define DLN2_TRANSFERS_WAIT_COMPLETE        1#define DLN2_TRANSFERS_CANCEL           0#define DLN2_RPM_AUTOSUSPEND_TIMEOUT        2000​struct dln2_spi {    struct platform_device *pdev;    struct spi_master *master;    u8 port;​    /*     * This buffer will be used mainly for read/write operations. Since     * they're quite large, we cannot use the stack. Protection is not     * needed because all SPI communication is serialized by the SPI core.     */    void *buf;