static int __init udc_init(void)
{
printk(KERN_INFO "%s (%s)\n", driver_desc, DRIVER_VERSION);
return platform_driver_register(&udc_driver);//驱动注册进系统
}
发现设备后调用PROBE函数
static int __init fsl_udc_probe(struct platform_device *pdev)
{
struct resource *res;
struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
int ret = -ENODEV;
unsigned int i;
u32 dccparams, portsc;
if (strcmp(pdev->name, driver_name)) {
VDBG("Wrong device\n");
return -ENODEV;
}
/********************************************************/
static struct fsl_udc *udc_controller;
全局变量定义
/*******************************************************/
udc_controller = kzalloc(sizeof(struct fsl_udc), GFP_KERNEL);
if (udc_controller == NULL) {
ERR("malloc udc failed\n");
return -ENOMEM;
}
udc_controller->pdata = pdata; //私有变量赋值
#ifdef CONFIG_USB_OTG
/* Memory and interrupt resources will be passed from OTG */
udc_controller->transceiver = otg_get_transceiver();//在OTG功能中已经通过otg_set_transceiver 设置了transceiver结构，这里面就可以GET
if (!udc_controller->transceiver) {
printk(KERN_ERR "Can‘t find OTG driver!\n");
ret = -ENODEV;
goto err1a;
}
res = otg_get_resources(); //获得资源
if (!res) {
DBG("resource not registered!\n");
return -ENODEV;
}
#else
if ((pdev->dev.parent) &&
(to_platform_device(pdev->dev.parent)->resource)) {
pdev->resource =
to_platform_device(pdev->dev.parent)->resource;
pdev->num_resources =
to_platform_device(pdev->dev.parent)->num_resources;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -ENXIO;
goto err1a;
}
if (!request_mem_region(res->start, resource_size(res),
driver_name)) {
ERR("request mem region for %s failed \n", pdev->name);
ret = -EBUSY;
goto err1a;
}
#endif
/*将物理地址映射为驱动可以访问的虚拟地址*/
dr_regs = ioremap(res->start, resource_size(res));
if (!dr_regs) {
ret = -ENOMEM;
goto err1;
}
pdata->regs = (void *)dr_regs; //私有数据接收映射地址
/*
* do platform specific init: check the clock, grab/config pins, etc.
*/
/*调用私有数据的初始化函数，关于初始化函数下面分析*/
if (pdata->platform_init && pdata->platform_init(pdev)) {
ret = -ENODEV;
goto err2a;
}
if (pdata->have_sysif_regs)
usb_sys_regs = (struct usb_sys_interface *)
((u32)dr_regs + USB_DR_SYS_OFFSET);
/* Read Device Controller Capability Parameters register */
dccparams = fsl_readl(&dr_regs->dccparams);
if (!(dccparams & DCCPARAMS_DC)) {
ERR("This SOC doesn‘t support device role\n");
ret = -ENODEV;
goto err2;
}
/* Get max device endpoints */
/* DEN is bidirectional ep number, max_ep doubles the number */
udc_controller->max_ep = (dccparams & DCCPARAMS_DEN_MASK) * 2;
#ifdef CONFIG_USB_OTG
res++;
udc_controller->irq = res->start;
#else
udc_controller->irq = platform_get_irq(pdev, 0);
#endif
if (!udc_controller->irq) {
ret = -ENODEV;
goto err2;
}
/*注册中断，该中断和OTG的中断共享一个*/
ret = request_irq(udc_controller->irq, fsl_udc_irq, IRQF_SHARED,
driver_name, udc_controller);
if (ret != 0) {
ERR("cannot request irq %d err %d \n",
udc_controller->irq, ret);
goto err2;
}
/* Initialize the udc structure including QH member and other member */
/*对一些资源进行空间开辟等初始化操作*/
if (struct_udc_setup(udc_controller, pdev)) {
ERR("Can‘t initialize udc data structure\n");
ret = -ENOMEM;
goto err3;
}
if (!udc_controller->transceiver) {
/* initialize usb hw reg except for regs for EP,
* leave usbintr reg untouched */
dr_controller_setup(udc_controller);
}
/* Setup gadget structure */
udc_controller->gadget.ops = &fsl_gadget_ops;
udc_controller->gadget.is_dualspeed = 1;
udc_controller->gadget.ep0 = &udc_controller->eps[0].ep;
INIT_LIST_HEAD(&udc_controller->gadget.ep_list);
udc_controller->gadget.speed = USB_SPEED_UNKNOWN;
udc_controller->gadget.name = driver_name;
/* Setup gadget.dev and register with kernel */
dev_set_name(&udc_controller->gadget.dev, "gadget");
udc_controller->gadget.dev.release = fsl_udc_release;
udc_controller->gadget.dev.parent = &pdev->dev;
ret = device_register(&udc_controller->gadget.dev);
if (ret < 0)
goto err3;
if (udc_controller->transceiver) {
udc_controller->gadget.is_otg = 1;
/* now didn‘t support lpm in OTG mode*/
device_set_wakeup_capable(&pdev->dev, 0);
}
/* setup QH and epctrl for ep0 */
ep0_setup(udc_controller);
/* setup udc->eps[] for ep0 */
struct_ep_setup(udc_controller, 0, "ep0", 0);
/* for ep0: the desc defined here;
* for other eps, gadget layer called ep_enable with defined desc
*/
udc_controller->eps[0].desc = &fsl_ep0_desc;
udc_controller->eps[0].ep.maxpacket = USB_MAX_CTRL_PAYLOAD;
/* setup the udc->eps[] for non-control endpoints and link
* to gadget.ep_list */
for (i = 1; i < (int)(udc_controller->max_ep / 2); i++) {
char name[14];
sprintf(name, "ep%dout", i);
struct_ep_setup(udc_controller, i * 2, name, 1);
sprintf(name, "ep%din", i);
struct_ep_setup(udc_controller, i * 2 + 1, name, 1);
}
/* use dma_pool for TD management */
udc_controller->td_pool = dma_pool_create("udc_td", &pdev->dev,
sizeof(struct ep_td_struct),
DTD_ALIGNMENT, UDC_DMA_BOUNDARY);
if (udc_controller->td_pool == NULL) {
ret = -ENOMEM;
goto err4;
}
if (g_iram_size) {
for (i = 0; i < IRAM_PPH_NTD; i++) {
udc_controller->iram_buffer[i] =
USB_IRAM_BASE_ADDR + i * g_iram_size;
udc_controller->iram_buffer_v[i] =
IO_ADDRESS(udc_controller->iram_buffer[i]);
}
}
#ifdef POSTPONE_FREE_LAST_DTD
last_free_td = NULL;
#endif
/* disable all INTR */
fsl_writel(0, &dr_regs->usbintr);
dr_wake_up_enable(udc_controller, false);
udc_controller->stopped = 1;
portsc = fsl_readl(&dr_regs->portsc1);
portsc |= PORTSCX_PHY_LOW_POWER_SPD;
fsl_writel(portsc, &dr_regs->portsc1);
if (udc_controller->pdata->usb_clock_for_pm)
udc_controller->pdata->usb_clock_for_pm(false);
create_proc_file();
return 0;
err4:
device_unregister(&udc_controller->gadget.dev);
err3:
free_irq(udc_controller->irq, udc_controller);
err2:
if (pdata->platform_uninit)
pdata->platform_uninit(pdata);
err2a:
iounmap((u8 __iomem *)dr_regs);
err1:
if (!udc_controller->transceiver)
release_mem_region(res->start, resource_size(res));
err1a:
kfree(udc_controller);
udc_controller = NULL;
return ret;
}
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