WhyCan Forum(哇酷开发者社区)

缥缈九哥

会员

注册时间： 2020-05-09

已发帖子： 93

积分： 96

添加AL9V576的CHAR驱动到基于linux-2.6.27的9G9260开发板--缥缈九哥

添加AL9V576的CHAR驱动到基于linux-2.6.27的9G9260开发板
 
1，修改drivers/char/Makefile文件
root@yuanxh-desktop:/home/yuanxh/sam9260/linux-2.6.27-9g9260#  vi drivers/char/Makefile
在第102行添加：

obj-$(CONFIG_FY_AL9V576) += al9v576.o

2， 修改drivers/char/Kconfig文件
root@yuanxh-desktop:/home/yuanxh/sam9260/linux-2.6.27-9g9260#  vi drivers/char/Kconfig
在第1123行添加：

config FY_AL9V576
  tristate "AverLogic AL9V576 MPEG-4/2/1 A/V Encoder"
  depends on MACH_9G9260EK
  help
    If you say yes here you get support for the
    AverLogic AL9V576 MPEG-4/2/1 A/V Encoder.

    This driver can also be built as a module. If so, the module
    will be called al9v576.
config FY_AL9V576_DEBUG
  boolean "AL9V576 Encoder debug messages"
  depends on MACH_9G9260EK && FY_AL9V576
  help
    Select this if you want AL9V576 debug messages
 
3，编译配置内核
root@yuanxh-desktop:/home/yuanxh/sam9260/linux-2.6.27-9g9260#  make menuconfig
进入配置菜单添加驱动到内核：

    System Type  --->  
 Atmel AT91 System-on-Chip  --->
 [*] Atmel AT91SAM9260-EK / AT91SAM9XE Evaluation Kit  
 [*]   9G9260-EK Evaluation Kit 
 
    Device Drivers  ---> 
 Character devices  --->
 <M> AverLogic AL9V576 MPEG-4/2/1 A/V Encoder 
 [*]   AL9V576 Encoder debug messages

     
4，修改arch/arm/mach-at91/board-sam9260ek.c文件
root@yuanxh-desktop:/home/yuanxh/sam9260/linux-2.6.27-9g9260#  vi arch/arm/mach-at91/board-sam9260ek.c
在头文件列表后添加：

  #include <mach/at91sam9260.h>
  #include <mach/at91sam9260_matrix.h>
  #include <mach/at91sam9_smc.h>
 
 在static void __init ek_board_init(void)内部添加： 
  #if defined(CONFIG_MACH_9G9260EK)
   /* al9v576 */
   at91_add_device_al9v576();  
  #endif
  
 在static void __init ek_board_init(void)前面添加：
  #if defined(CONFIG_MACH_9G9260EK)

  #define AL9V576_BASE AT91_CHIPSELECT_0
  #define AL9V576_SIZE SZ_1K
  
  static struct resource al9v576_resources[] =
  {
   {
    .start = AL9V576_BASE,
    .end = AL9V576_BASE + AL9V576_SIZE - 1,
    .flags = IORESOURCE_MEM,
   }
  };
  
  static struct platform_device al9v576_driver =
  {
   .name  = "al9v576",
   .id   = 0,
   .dev  =
   {
    .platform_data = NULL,
   },
   .resource = al9v576_resources,
   .num_resources = ARRAY_SIZE(al9v576_resources),
  };
  
  static struct sam9_smc_config __initdata al9v576_smc_config =
  {
   .ncs_read_setup  = 0x01,
   .nrd_setup   = 0x02,
   .ncs_write_setup = 0x01,
   .nwe_setup   = 0x02,
  
   .ncs_read_pulse  = 0x08,
   .nrd_pulse   = 0x06,
   .ncs_write_pulse = 0x08,
   .nwe_pulse   = 0x06,
  
   .read_cycle   = 0x12,
   .write_cycle  = 0x12,
  
   .mode    = AT91_SMC_READMODE | AT91_SMC_WRITEMODE | AT91_SMC_EXNWMODE_DISABLE,
   .tdf_cycles   = 0x08,
  };
  
  static __init void at91_add_device_al9v576(void)
  {
   unsigned long csa;
  
   csa = at91_sys_read(AT91_MATRIX_EBICSA);
   at91_sys_write(AT91_MATRIX_EBICSA, csa | AT91_MATRIX_VDDIOMSEL_3_3V);
   
   /* setup bus-width (8 or 16) */
  #if defined(CONFIG_AL9V576_BUSWIDTH_16)
    al9v576_smc_config.mode |= AT91_SMC_DBW_16;
  #else
    al9v576_smc_config.mode |= AT91_SMC_DBW_8;
  #endif
   /* configure chip-select 0 (AL9V576) */
   sam9_smc_configure(0, &al9v576_smc_config);
  
   platform_device_register(&al9v576_driver);
  }
  #endif

5，添加drivers/char/al9v576.h文件
root@yuanxh-desktop:/home/yuanxh/sam9260/linux-2.6.27-9g9260#  vi drivers/char/al9v576.h
添加的源码见附件。
6，添加drivers/char/al9v576.c文件
root@yuanxh-desktop:/home/yuanxh/sam9260/linux-2.6.27-9g9260#  vi drivers/char/al9v576.c
添加的源码见附件。
7, 编译内核生成驱动
root@yuanxh-desktop:/home/yuanxh/sam9260/linux-2.6.27-9g9260#  make

附件：

(保密)