arch/arm/plat-samsung/include/plat/s3c64xx-spi.h

   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 struct platform_device;
  15
  16 /**
  17  * struct s3c64xx_spi_csinfo - ChipSelect description
  18  * @fb_delay: Slave specific feedback delay.
  19  *            Refer to FB_CLK_SEL register definition in SPI chapter.
  20  * @line: Custom 'identity' of the CS line.
  21  *
  22  * This is per SPI-Slave Chipselect information.
  23  * Allocate and initialize one in machine init code and make the
  24  * spi_board_info.controller_data point to it.
  25  */
  26 struct s3c64xx_spi_csinfo {
  27         u8 fb_delay;
  28         unsigned line;
  29 };
  30
  31 /**
  32  * struct s3c64xx_spi_info - SPI Controller defining structure
  33  * @src_clk_nr: Clock source index for the CLK_CFG[SPI_CLKSEL] field.
  34  * @num_cs: Number of CS this controller emulates.
  35  * @cfg_gpio: Configure pins for this SPI controller.
  36  */
  37 struct s3c64xx_spi_info {
  38         int src_clk_nr;
  39         int num_cs;
  40         int (*cfg_gpio)(void);
  41 };
  42
  43 /**
  44  * s3c64xx_spi_set_platdata - SPI Controller configure callback by the board
  45  *                              initialization code.
  46  * @cfg_gpio: Pointer to gpio setup function.
  47  * @src_clk_nr: Clock the SPI controller is to use to generate SPI clocks.
  48  * @num_cs: Number of elements in the 'cs' array.
  49  *
  50  * Call this from machine init code for each SPI Controller that
  51  * has some chips attached to it.
  52  */
  53 extern void s3c64xx_spi0_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  54                                                 int num_cs);
  55 extern void s3c64xx_spi1_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  56                                                 int num_cs);
  57 extern void s3c64xx_spi2_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  58                                                 int num_cs);
  59
  60 /* defined by architecture to configure gpio */
  61 extern int s3c64xx_spi0_cfg_gpio(void);
  62 extern int s3c64xx_spi1_cfg_gpio(void);
  63 extern int s3c64xx_spi2_cfg_gpio(void);
  64
  65 extern struct s3c64xx_spi_info s3c64xx_spi0_pdata;
  66 extern struct s3c64xx_spi_info s3c64xx_spi1_pdata;
  67 extern struct s3c64xx_spi_info s3c64xx_spi2_pdata;
  68 #endif /* __S3C64XX_PLAT_SPI_H */