LXR linux/include/linux/platform

   1/* linux/arch/arm/plat-samsung/include/plat/s3c64xx-spi.h
   2 *
   3 * Copyright (C) 2009 Samsung Electronics Ltd.
   4 *      Jaswinder Singh <jassi.brar@samsung.com>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#ifndef __S3C64XX_PLAT_SPI_H
  12#define __S3C64XX_PLAT_SPI_H
  13
  14#include <linux/dmaengine.h>
  15
  16struct platform_device;
  17
  18/**
  19 * struct s3c64xx_spi_csinfo - ChipSelect description
  20 * @fb_delay: Slave specific feedback delay.
  21 *            Refer to FB_CLK_SEL register definition in SPI chapter.
  22 * @line: Custom 'identity' of the CS line.
  23 *
  24 * This is per SPI-Slave Chipselect information.
  25 * Allocate and initialize one in machine init code and make the
  26 * spi_board_info.controller_data point to it.
  27 */
  28struct s3c64xx_spi_csinfo {
  29        u8 fb_delay;
  30        unsigned line;
  31};
  32
  33/**
  34 * struct s3c64xx_spi_info - SPI Controller defining structure
  35 * @src_clk_nr: Clock source index for the CLK_CFG[SPI_CLKSEL] field.
  36 * @num_cs: Number of CS this controller emulates.
  37 * @cfg_gpio: Configure pins for this SPI controller.
  38 */
  39struct s3c64xx_spi_info {
  40        int src_clk_nr;
  41        int num_cs;
  42        int (*cfg_gpio)(void);
  43        dma_filter_fn filter;
  44};
  45
  46/**
  47 * s3c64xx_spi_set_platdata - SPI Controller configure callback by the board
  48 *                              initialization code.
  49 * @cfg_gpio: Pointer to gpio setup function.
  50 * @src_clk_nr: Clock the SPI controller is to use to generate SPI clocks.
  51 * @num_cs: Number of elements in the 'cs' array.
  52 *
  53 * Call this from machine init code for each SPI Controller that
  54 * has some chips attached to it.
  55 */
  56extern void s3c64xx_spi0_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  57                                                int num_cs);
  58extern void s3c64xx_spi1_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  59                                                int num_cs);
  60extern void s3c64xx_spi2_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  61                                                int num_cs);
  62
  63/* defined by architecture to configure gpio */
  64extern int s3c64xx_spi0_cfg_gpio(void);
  65extern int s3c64xx_spi1_cfg_gpio(void);
  66extern int s3c64xx_spi2_cfg_gpio(void);
  67
  68extern struct s3c64xx_spi_info s3c64xx_spi0_pdata;
  69extern struct s3c64xx_spi_info s3c64xx_spi1_pdata;
  70extern struct s3c64xx_spi_info s3c64xx_spi2_pdata;
  71#endif /* __S3C64XX_PLAT_SPI_H */
  72