include/linux/platform_data/spi-s3c64xx.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 #include <linux/dmaengine.h>
  15
  16 struct 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  */
  28 struct 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  */
  39 struct 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  */
  56 extern void s3c64xx_spi0_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  57                                                 int num_cs);
  58 extern void s3c64xx_spi1_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  59                                                 int num_cs);
  60 extern 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 */
  64 extern int s3c64xx_spi0_cfg_gpio(void);
  65 extern int s3c64xx_spi1_cfg_gpio(void);
  66 extern int s3c64xx_spi2_cfg_gpio(void);
  67
  68 extern struct s3c64xx_spi_info s3c64xx_spi0_pdata;
  69 extern struct s3c64xx_spi_info s3c64xx_spi1_pdata;
  70 extern struct s3c64xx_spi_info s3c64xx_spi2_pdata;
  71 #endif /* __S3C64XX_PLAT_SPI_H */