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UCLASS./drivers/serial/serial-uclass.c L504504 UCLASS_DRIVER(serial) = { 505 .id = UCLASS_SERIAL, 506 .name = "serial", 507 .flags = DM_UC_FLAG_SEQ_ALIAS, 508 .post_probe = serial_post_probe, 509 .pre_remove = serial_pre_remove, 510 .per_device_auto_alloc_size = sizeof(struct serial_dev_priv), 511 };DRIVER./drivers/serial/s3c64xx_serial.c L218static const struct udevice_id s3c64xx_serial_ids[] = { { .compatible = "samsung,ok6410-uart" }, { } };U_BOOT_DRIVER(serial_s3c64xx) = { .name = "serial_s3c64xx", .id = UCLASS_SERIAL, .of_match = s3c64xx_serial_ids, .ofdata_to_platdata = s3c64xx_serial_ofdata_to_platdata, .platdata_auto_alloc_size = sizeof(struct s3c64xx_serial_platdata), .probe = s3c64xx_serial_probe, .ops = &s3c64xx_serial_ops, .flags = DM_FLAG_PRE_RELOC, };DEVICEarch/arm/dts/s3c64xx-ok6410a.dts L54 serial0@7F005000 { compatible = "samsung,ok6410-uart"; reg = <0x7F005000 0x400>; interrupt-parent = <&gic>; interrupts = <0 37 0>; id = <0>; }; initf_dm dm_init_and_scan dm_extended_scan_fdt dm_scan_fdt dm_scan_fdt_node for_each_node // node serial0@7F005000 lists_bind_fdt driver_check_compatible strcmp(of_match->compatible, compat) device_bind_with_driver_data device_bind_common dev = calloc(1, sizeof(struct udevice)); dev->driver = drv; dev->uclass = uc; uclass_bind_device(dev); if (drv->bind) drv->bind(dev);init_baud_rateserial_init serial_find_console_or_panic serial_check_stdout fdtdec_get_chosen_prop uclass_get_device_by_of_offset uclass_get_device_tail device_probe device_ofdata_to_platdata if (drv->ofdata_to_platdata && (CONFIG_IS_ENABLED(OF_PLATDATA) || dev_has_of_node(dev))) drv->ofdata_to_platdata(dev); if (drv->probe) drv->probe(dev);/即s3c64xx_serial_probe s3c64xx_serial_init uart->UFCON = 0; serial_setbrg
initr_dmserial_initialize serial_init极度类似 initf_dm
消费者调用的 是 UCLASS(./drivers/serial/serial-uclass.c) 中提供的 api为下面 的函数serial_init(void)serial_initialize(void)serial_putc(char ch)serial_puts(const char *str)serial_getc(void)serial_tstc(void)serial_setbrg(void)serial_getconfig(struct udevice *dev, uint *config)serial_setconfig(struct udevice *dev, uint config)serial_getinfo(struct udevice *dev, struct serial_device_info *info)serial_stdio_init(void)
board_init_f serial_init serial_setbrg display_options printf puts serial_puts board_init_r serial_initialize serial_init serial_setbrg stdio_add_devices serial_stdio_init console_init_r print_pre_console_buffer(flushpoint); puts console_puts stdio_devices[file]->puts(stdio_devices[file], s);/ 即 stdio_serial_puts serial_puts run_main_loop main_loop cli_loop ... getcmd_getch serial_getcprintf // lib/vsprintf.c puts // common/console.c fputs // common/console.c console_puts // common/console.c stdio_devices[file]->puts(stdio_devices[file], s);/ 即 stdio_serial_puts serial_puts(s);
static const struct udevice_id s3c64xx_serial_ids[] = { { .compatible = "samsung,ok6410-uart" }, { } };s3c64xx_serial_probe s3c64xx_serial_initstatic const struct dm_serial_ops s3c64xx_serial_ops = { .putc = s3c64xx_serial_putc, .pending = s3c64xx_serial_pending, .getc = s3c64xx_serial_getc, .setbrg = s3c64xx_serial_setbrg, };U_BOOT_DRIVER(serial_s3c64xx) = { .name = "serial_s3c64xx", .id = UCLASS_SERIAL, .of_match = s3c64xx_serial_ids, .ofdata_to_platdata = s3c64xx_serial_ofdata_to_platdata, .platdata_auto_alloc_size = sizeof(struct s3c64xx_serial_platdata), .probe = s3c64xx_serial_probe, .ops = &s3c64xx_serial_ops, .flags = DM_FLAG_PRE_RELOC, }; serial_getc // UCLASS 提供的 API _serial_getc(gd->cur_serial_dev); __serial_getc(dev); struct dm_serial_ops *ops = serial_get_ops(dev); ops->getc(dev); / 即 s3c64xx_serial_getc struct s3c64xx_serial_platdata *plat = dev->platdata; struct s3c64xx_uart *const uart = plat->reg; while (!(uart->UTRSTAT & 0x1)); return uart->URXH & 0xff;
initf_dm 过程中匹配成功的- found match at 's3c64xx_gpio': 'samsung,s3c6410-pinctrl' matches 'samsung,s3c6410-pinctrl'- found match at 's3c6410_clock': 'samsung,s3c6410-clk' matches 'samsung,s3c6410-clk'- found match at 'serial_s3c64xx': 'samsung,ok6410-uart' matches 'samsung,ok6410-uart'
initr_dm 过程中匹配成功的- found match at 's3c64xx_gpio': 'samsung,s3c6410-pinctrl' matches 'samsung,s3c6410-pinctrl'- found match at 's3c6410_clock': 'samsung,s3c6410-clk' matches 'samsung,s3c6410-clk'- found match at 'serial_s3c64xx': 'samsung,ok6410-uart' matches 'samsung,ok6410-uart'
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