linux uart驱动——uart platfrom 注册(三)
一:注册platform device
注册一个platfrom device一般需要初始化两个内容,设备占用的资源resource和设备私有数据dev.platfrom_data。设备的resource占用的资源主要包含两个方面:IO内存和IRQ资源信息,有时也包含DMA。
resource结构:
1: struct resource {
2: resource_size_t start;//定义资源的起始地址
3: resource_size_t end;//定义资源的结束地址
4: const char *name;//定义资源的名称
5: unsigned long flags;//定义资源的类型,比如MEM,IO,IRQ,DMA类型
6: struct resource *parent, *sibling, *child;//资源链表指针
7: };
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笔者当前的君正board有三个串口:
1: #ifdef CONFIG_SERIAL_JZ47XX_UART0
2: /* UART ( uart controller) */
3: static struct resource jz_uart0_resources[] = {
4: [0] = {
5: .start = UART0_IOBASE,
6: .end = UART0_IOBASE + 0x1000 - 1,
7: .flags = IORESOURCE_MEM,
8: },
9: [1] = {
10: .start = IRQ_UART0,
11: .end = IRQ_UART0,
12: .flags = IORESOURCE_IRQ,
13: },
14: #ifdef CONFIG_SERIAL_JZ47XX_UART0_DMA
15: [2] = {
16: .start = JZDMA_REQ_UART0,
17: .flags = IORESOURCE_DMA,
18: },
19: #endif
20: };
21:
22: struct platform_device jz_uart0_device = {
23: .name = "jz-uart",
24: .id = 0,
25: .num_resources = ARRAY_SIZE(jz_uart0_resources),
26: .resource = jz_uart0_resources,
27: };
28: #endif
29: #ifdef CONFIG_SERIAL_JZ47XX_UART1
30: static struct resource jz_uart1_resources[] = {
31: [0] = {
32: .start = UART1_IOBASE,
33: .end = UART1_IOBASE + 0x1000 - 1,
34: .flags = IORESOURCE_MEM,
35: },
36: [1] = {
37: .start = IRQ_UART1,
38: .end = IRQ_UART1,
39: .flags = IORESOURCE_IRQ,
40: },
41: #ifdef CONFIG_SERIAL_JZ47XX_UART1_DMA
42: [2] = {
43: .start = JZDMA_REQ_UART1,
44: .flags = IORESOURCE_DMA,
45: },
46: #endif
47: };
48: struct platform_device jz_uart1_device = {
49: .name = "jz-uart",
50: .id = 1,
51: .num_resources = ARRAY_SIZE(jz_uart1_resources),
52: .resource = jz_uart1_resources,
53: };
54: #endif
55: #ifdef CONFIG_SERIAL_JZ47XX_UART2
56: static struct resource jz_uart2_resources[] = {
57: [0] = {
58: .start = UART2_IOBASE,
59: .end = UART2_IOBASE + 0x1000 - 1,
60: .flags = IORESOURCE_MEM,
61: },
62: [1] = {
63: .start = IRQ_UART2,
64: .end = IRQ_UART2,
65: .flags = IORESOURCE_IRQ,
66: },
67: #ifdef CONFIG_SERIAL_JZ47XX_UART2_DMA
68: [2] = {
69: .start = JZDMA_REQ_UART2,
70: .flags = IORESOURCE_DMA,
71: },
72: #endif
73: };
74:
75: struct platform_device jz_uart2_device = {
76: .name = "jz-uart",
77: .id = 2,
78: .num_resources = ARRAY_SIZE(jz_uart2_resources),
79: .resource = jz_uart2_resources,
80: };
81: #endif
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platform_device_register(&jz_uartXX_device);
注册成功后:(多个device)
ls /sys/bus/platform/devices/
jz-uart.0/ jz-uart.2/
二:注册platfrom driver
1: /* serial platfrom driver */
2: static struct platform_driver serial_jz47xx_driver = {
3: .probe = serial_jz47xx_probe,
4: .remove = serial_jz47xx_remove,
5:
6: .driver = {
7: .name = "jz-uart",
8: .owner = THIS_MODULE,
9: #ifdef CONFIG_PM
10: .pm = &serial_jz47xx_pm_ops,
11: #endif
12: },
13: };
14:
15: int __init serial_jz47xx_init(void)
16: {
17: int ret;
18: /* 功能:uart_register_driver用于将串口驱动uart_driver注册到内核(串口核心层)中,
19: 通常在模块初始化函数调用该函数。
20: * 参数 drv:要注册的uart_driver
21: * 返回值: 成功,返回0;否则返回错误码
22: */
23: ret = uart_register_driver(&serial_jz47xx_reg);
24: if (ret != 0)
25: return ret;
26:
27: /* 注册serial platfrom驱动 */
28: ret = platform_driver_register(&serial_jz47xx_driver);
29: if (ret != 0)
30: uart_unregister_driver(&serial_jz47xx_reg);
31:
32: return ret;
33: }
34:
35: void __exit serial_jz47xx_exit(void)
36: {
37: platform_driver_unregister(&serial_jz47xx_driver);
38: uart_unregister_driver(&serial_jz47xx_reg);
39: }
40:
41:
42: #ifdef CONFIG_EARLY_INIT_RUN
43: rootfs_initcall(serial_jz47xx_init);/*先于module注册*/
44:
45: #else
46: module_init(serial_jz47xx_init);
47:
48: #endif
49:
50: module_exit(serial_jz47xx_exit);
51:
52: MODULE_LICENSE("GPL");
53: MODULE_ALIAS("platform:jz47xx-uart");
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注册成功后:(一个driver对应多个device)
ls /sys/bus/platform/drivers/jz-uart/
bind jz-uart.0 jz-uart.2 uevent unbind
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