Linux内核---48.spi驱动修改

arch/arm/mach-s3c2440/mach-tq2440.c

1. --- a/arch/arm/mach-s3c2440/mach-tq2440.c
   
2. +++ b/arch/arm/mach-s3c2440/mach-tq2440.c
   
3. @@ -46,6 +46,9 @@
   
4.  
   
5.  #include <sound/s3c24xx_uda134x.h>
   
6.  
   
7. +#include <../mach-s3c2410/include/mach/spi.h>
   
8. +#include <linux/spi/spi.h>
   
9. +
   
10.  static struct map_desc tq2440_iodesc[] __initdata = {
    
11.  };
    
12.  
    
13. @@ -318,6 +321,22 @@ static struct platform_device s3c_device_uda134x = {
    
14.         }
    
15.  };
    
16.  
    
17. +static struct spi_board_info s3c2410_spi0_board[] = {
    
18. + [0] = {
    
19. + .modalias = "spidev",
    
20. + .bus_num = 0,
    
21. + .chip_select = 0,
    
22. + .irq = IRQ_EINT10,
    
23. + .max_speed_hz = 500*1000,
    
24. + },
    
25. +};
    
26. +
    
27. +static struct s3c2410_spi_info s3c2410_spi0_platdata = {
    
28. + .pin_cs = S3C2410_GPG2,
    
29. + .num_cs = 1,
    
30. + .bus_num = 0,
    
31. +};
    
32. +
    
33.  static struct platform_device *tq2440_devices[] __initdata = {
    
34.         &s3c_device_usb,
    
35.         &s3c_device_lcd,
    
36. @@ -330,6 +349,7 @@ static struct platform_device *tq2440_devices[] __initdata = {
    
37.  #endif
    
38.         &s3c_device_usbgadget,
    
39.         &s3c_device_uda134x,
    
40.         + &s3c_device_spi0,
    
41.  };
    
42.  
    
43.  static void __init tq2440_map_io(void)
    
44. @@ -346,6 +366,8 @@ static void __init tq2440_machine_init(void)
    
45.  
    
46.         platform_add_devices(tq2440_devices, ARRAY_SIZE(tq2440_devices));
    
47.         EmbedSky_machine_init();
    
48. + s3c_device_spi0.dev.platform_data= &s3c2410_spi0_platdata;
    
49. + spi_register_board_info(s3c2410_spi0_board, ARRAY_SIZE(s3c2410_spi0_board));
    
50.         s3c2410_gpio_setpin(S3C2410_GPG12, 0);
    
51.         s3c2410_gpio_cfgpin(S3C2410_GPG12, S3C2410_GPIO_OUTPUT);
    
52.         s3c24xx_udc_set_platdata(&EmbedSky_udc_cfg);

所有的改动都是在arch/arm/mach-s3c2440/mach-tq2440.c中
1. 添加include

1. #include <../mach-s3c2410/include/mach/spi.h>
   
2. #include <linux/spi/spi.h>

2.添加board_info

1. static struct spi_board_info s3c2410_spi0_board[] = {
   
2.         [0] = {
   
3.                  .modalias = "spidev",
   
4.                 .bus_num = 0,
   
5.                 .chip_select = 0,
   
6.                 .irq = IRQ_EINT10,
   
7.                 .max_speed_hz = 500*1000,
   
8.         },
   
9. };
   
10. 
    
11. static struct s3c2410_spi_info s3c2410_spi0_platdata = {
    
12.         .pin_cs = S3C2410_GPG2,
    
13.         .num_cs = 1,
    
14.         .bus_num = 0,
    
15. };

并在tq2440_machine_init中将board_info赋值

1. static void __init tq2440_machine_init(void)
   
2. {
3.     ....
   
4.     s3c_device_spi0.dev.platform_data= &s3c2410_spi0_platdata;
   
5.     spi_register_board_info(s3c2410_spi0_board, ARRAY_SIZE(s3c2410_spi0_board));
6.     .....
   
7. }

3.最后添加spi的设备
因为在./arch/arm/plat-s3c24xx/devs.c中己经有了spi0的platform_device，
这儿只需要添加到设备列表中即可

1. static struct platform_device *tq2440_devices[] __initdata = {
   
2.     &s3c_device_spi0,
   
3. };

4. 内核配置: make menuconfig

1. Device Drivers --->
   
2.       [*] SPI support ---> 
   
3.          *** SPI Master Controller Drivers *** 
   
4.          -*- Utilities for Bitbanging SPI masters --> SPI_BITBANG
   
5.          < > GPIO-based bitbanging SPI Master --> SPI_GPIO not set 
   
6.          <*> Samsung S3C24XX series SPI --> SPI_S3C24XX
   
7.          <*> Samsung S3C24XX series SPI by GPIO --> SPI_S3C24XX_GPIO
   
8.          *** SPI Protocol Masters *** 
   
9.          <*> User mode SPI device driver support --> SPI_SPIDEV
   
10.          < > Infineon TLE62X0 (for power switching)

1-3是添加spi的设备，4步是添加spi的driver