S5PV210平台之UART 的 platform_device

UART 的platform_device  

1、/kernel/arch/arm/mach-s5pv210/mach-smdkv210.c

static struct s3c2410_uartcfg smdkv210_uartcfgs[] __initdata = {

[0] = {

.hwport = 0,

.flags = 0,

.ucon = S5PV210_UCON_DEFAULT,

.ulcon = S5PV210_ULCON_DEFAULT,

.ufcon = S5PV210_UFCON_DEFAULT,

},

[1] = {

.hwport = 1,

.flags = 0,

.ucon = S5PV210_UCON_DEFAULT,

.ulcon = S5PV210_ULCON_DEFAULT,

.ufcon = S5PV210_UFCON_DEFAULT,

},

[2] = {

.hwport = 2,

.flags = 0,

.ucon = S5PV210_UCON_DEFAULT,

.ulcon = S5PV210_ULCON_DEFAULT,

.ufcon = S5PV210_UFCON_DEFAULT,

},

[3] = {

.hwport = 3,

.flags = 0,

.ucon = S5PV210_UCON_DEFAULT,

.ulcon = S5PV210_ULCON_DEFAULT,

.ufcon = S5PV210_UFCON_DEFAULT,

},

};

下面是具体过程：

MACHINE_START(SMDKV210, "SMDKV210")

.phys_io= S3C_PA_UART & 0xfff00000,

.io_pg_offst= (((u32)S3C_VA_UART) >> 18) & 0xfffc,

.boot_params= S5P_PA_SDRAM + 0x100,

.init_irq= s5pv210_init_irq,

.map_io= smdkv210_map_io,

.init_machine= smdkv210_machine_init,

.timer= &s5p_systimer,

MACHINE_END

static void __init smdkv210_map_io(void)

{

s5p_init_io(NULL, 0, S5P_VA_CHIPID);

s3c24xx_init_clocks(24000000);

s3c24xx_init_uarts(smdkv210_uartcfgs, ARRAY_SIZE(smdkv210_uartcfgs));

s5pv210_reserve_bootmem();

}

2、

static struct cpu_table cpu_ids[] __initdata = {

{

.idcode= 0x43110000,

.idmask= 0xfffff000,

.map_io= s5pv210_map_io,

.init_clocks= s5pv210_init_clocks,

.init_uarts= s5pv210_init_uarts,

.init= s5pv210_init,

.name= name_s5pv210,

},

};

void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)/* 3 */

{

if (cpu == NULL)

return;

if (cpu->init_uarts == NULL) {

printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");

} else

(cpu->init_uarts)(cfg, no);//这里最终会调用上面的s5pv210_init_uarts

}

#define s5pv210_init_uarts s5pv210_common_init_uarts

void __init s5pv210_common_init_uarts(struct s3c2410_uartcfg *cfg, int no)

{

......

//关于s5p_uart_resources可参考：UART的资源（struct resource）

s3c24xx_init_uartdevs("s5pv210-uart", s5p_uart_resources, cfg, no);

}

3、这里很重要

static int nr_uarts __initdata = 0;//全局变量-------表示uart数

static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];//全局变量   

regs-serial.h中

/* s3c24xx_uart_devs

 * this is exported from the core as we cannot use driver_register(), or platform_add_device() before the console_initcall()

*/

extern struct platform_device *s3c24xx_uart_devs[4];

/* s3c24xx_init_uartdevs

 *

 * copy the specified platform data and configuration into our central

 * set of devices, before the data is thrown away after the init process.

 *

 * This also fills in the array passed to the serial driver for the

 * early initialisation of the console.

*/

void __init s3c24xx_init_uartdevs(char *name,  struct s3c24xx_uart_resources *res,  struct s3c2410_uartcfg *cfg, int no)

{

struct platform_device *platdev;

struct s3c2410_uartcfg *cfgptr = uart_cfgs;

struct s3c24xx_uart_resources *resp;

int uart;

memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);

for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {

 

platdev =s3c24xx_uart_src[cfgptr->hwport]; //关于s3c24xx_uart_src可参考：UART的资源（struct resource）

resp = res + cfgptr->hwport;

s3c24xx_uart_devs[uart] = platdev;//保存到platform_device中

platdev->name = name;

platdev->resource = resp->resources;

platdev->num_resources = resp->nr_resources;

platdev->dev.platform_data = cfgptr;

}

nr_uarts = no;

}

static int __init s3c_arch_init(void)

{

.....

ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);//注册platform_device

}

arch_initcall(s3c_arch_init);

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

#define S5PV210_UART_DEFAULT_INFO(fifo_size) \

.name = "Samsung S5PV210 UART0", \

.type = PORT_S3C6400, \

.fifosize= fifo_size,\

.has_divslot= 1,\

.rx_fifomask= S5PV210_UFSTAT_RXMASK,\

.rx_fifoshift= S5PV210_UFSTAT_RXSHIFT,\

.rx_fifofull= S5PV210_UFSTAT_RXFULL,\

.tx_fifofull= S5PV210_UFSTAT_TXFULL,\

.tx_fifomask= S5PV210_UFSTAT_TXMASK,\

.tx_fifoshift= S5PV210_UFSTAT_TXSHIFT,\

.get_clksrc= s5pv210_serial_getsource,\

.set_clksrc= s5pv210_serial_setsource,\

.reset_port= s5pv210_serial_resetport

static struct s3c24xx_uart_info s5p_port_fifo256 = {

S5PV210_UART_DEFAULT_INFO(256),

};

static struct s3c24xx_uart_info s5p_port_fifo64 = {

S5PV210_UART_DEFAULT_INFO(64),

};

static struct s3c24xx_uart_info s5p_port_fifo16 = {

S5PV210_UART_DEFAULT_INFO(16),

};

static struct s3c24xx_uart_info *s5p_uart_inf[] = {

[0] = &s5p_port_fifo256,

[1] = &s5p_port_fifo64,

[2] = &s5p_port_fifo16,

[3] = &s5p_port_fifo16,

};

/* device management */

static int s5p_serial_probe(struct platform_device *pdev)

{

return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);

}

static struct platform_drivers5p_serial_drv = {

.probe = s5p_serial_probe,

.remove = __devexit_p(s3c24xx_serial_remove),

.driver = {

.name = "s5pv210-uart",

.owner = THIS_MODULE,

},

};

static int __init s5pv210_serial_console_init(void)

{

return s3c24xx_serial_initconsole(&s5p_serial_drv, s5p_uart_inf);

}

console_initcall(s5pv210_serial_console_init);

static int __init s5p_serial_init(void)

{

return platform_driver_register(&s5p_serial_drv);//注册platform_driver

}

module_init(s5p_serial_init);

原文出处：http://fangjian0518.blog.163.com/blog/static/55919656201152535253959/