include/linux/platform_data/spi-s3c64xx.h

   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
  15 struct 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  */
  27 struct 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  */
  38 struct 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  */
  58 extern void s3c64xx_spi0_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  59                                                 int num_cs);
  60 extern void s3c64xx_spi1_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
  61                                                 int num_cs);
  62 extern 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 */
  66 extern int s3c64xx_spi0_cfg_gpio(void);
  67 extern int s3c64xx_spi1_cfg_gpio(void);
  68 extern int s3c64xx_spi2_cfg_gpio(void);
  69
  70 extern struct s3c64xx_spi_info s3c64xx_spi0_pdata;
  71 extern struct s3c64xx_spi_info s3c64xx_spi1_pdata;
  72 extern struct s3c64xx_spi_info s3c64xx_spi2_pdata;
  73 #endif /*__SPI_S3C64XX_H */