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 /**
  15  * struct s3c64xx_spi_csinfo - ChipSelect description
  16  * @fb_delay: Slave specific feedback delay.
  17  *            Refer to FB_CLK_SEL register definition in SPI chapter.
  18  * @line: Custom 'identity' of the CS line.
  19  * @set_level: CS line control.
  20  *
  21  * This is per SPI-Slave Chipselect information.
  22  * Allocate and initialize one in machine init code and make the
  23  * spi_board_info.controller_data point to it.
  24  */
  25 struct s3c64xx_spi_csinfo {
  26         u8 fb_delay;
  27         unsigned line;
  28         void (*set_level)(unsigned line_id, int lvl);
  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  * @src_clk_name: Platform name of the corresponding clock.
  35  * @num_cs: Number of CS this controller emulates.
  36  * @cfg_gpio: Configure pins for this SPI controller.
  37  * @fifo_lvl_mask: All tx fifo_lvl fields start at offset-6
  38  * @rx_lvl_offset: Depends on tx fifo_lvl field and bus number
  39  * @high_speed: If the controller supports HIGH_SPEED_EN bit
  40  */
  41 struct s3c64xx_spi_info {
  42         int src_clk_nr;
  43         char *src_clk_name;
  44
  45         int num_cs;
  46
  47         int (*cfg_gpio)(struct platform_device *pdev);
  48
  49         /* Following two fields are for future compatibility */
  50         int fifo_lvl_mask;
  51         int rx_lvl_offset;
  52         int high_speed;
  53 };
  54
  55 /**
  56  * s3c64xx_spi_set_info - SPI Controller configure callback by the board
  57  *                              initialization code.
  58  * @cntrlr: SPI controller number the configuration is for.
  59  * @src_clk_nr: Clock the SPI controller is to use to generate SPI clocks.
  60  * @num_cs: Number of elements in the 'cs' array.
  61  *
  62  * Call this from machine init code for each SPI Controller that
  63  * has some chips attached to it.
  64  */
  65 extern void s3c64xx_spi_set_info(int cntrlr, int src_clk_nr, int num_cs);
  66
  67 #endif /* __S3C64XX_PLAT_SPI_H */