LXR linux/include/linux/platform

   1/*
   2 * Copyright (C) 2009 Samsung Electronics Ltd.
   3 *      Jaswinder Singh <jassi.brar@samsung.com>
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License version 2 as
   7 * published by the Free Software Foundation.
   8 */
   9
  10#ifndef __SPI_S3C64XX_H
  11#define __SPI_S3C64XX_H
  12
  13#include <linux/dmaengine.h>
  14
  15struct platform_device;
  16
  17/**
  18 * struct s3c64xx_spi_csinfo - ChipSelect description
  19 * @fb_delay: Slave specific feedback delay.
  20 *            Refer to FB_CLK_SEL register definition in SPI chapter.
  21 * @line: Custom 'identity' of the CS line.
  22 *
  23 * This is per SPI-Slave Chipselect information.
  24 * Allocate and initialize one in machine init code and make the
  25 * spi_board_info.controller_data point to it.
  26 */
  27struct s3c64xx_spi_csinfo {
  28        u8 fb_delay;
  29        unsigned line;
  30};
  31
  32/**
  33 * struct s3c64xx_spi_info - SPI Controller defining structure
  34 * @src_clk_nr: Clock source index for the CLK_CFG[SPI_CLKSEL] field.
  35 * @num_cs: Number of CS this controller emulates.
  36 * @cfg_gpio: Configure pins for this SPI controller.
  37 */
  38struct s3c64xx_spi_info {
  39        int src_clk_nr;
  40        int num_cs;
  41        bool no_cs;
  42        int (*cfg_gpio)(void);
  43        dma_filter_fn filter;
  44        void *dma_tx;
  45        void *dma_rx;
  46};
  47
  48/**
  49 * s3c64xx_spi_set_platdata - SPI Controller configure callback by the board
  50 *                              initialization code.
  51 * @cfg_gpio: Pointer to gpio setup function.
  52 * @src_clk_nr: Clock the SPI controller is to use to generate SPI clocks.
  53 * @num_cs: Number of elements in the 'cs' array.
  54 *
  55 * Call this from machine init code for each SPI Controller that
  56 * has some chips attached to it.
  57 */
  58extern void s3c64xx_spi0_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  59                                                int num_cs);
  60extern void s3c64xx_spi1_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  61                                                int num_cs);
  62extern void s3c64xx_spi2_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  63                                                int num_cs);
  64
  65/* defined by architecture to configure gpio */
  66extern int s3c64xx_spi0_cfg_gpio(void);
  67extern int s3c64xx_spi1_cfg_gpio(void);
  68extern int s3c64xx_spi2_cfg_gpio(void);
  69
  70extern struct s3c64xx_spi_info s3c64xx_spi0_pdata;
  71extern struct s3c64xx_spi_info s3c64xx_spi1_pdata;
  72extern struct s3c64xx_spi_info s3c64xx_spi2_pdata;
  73#endif /*__SPI_S3C64XX_H */
  74