usb ohci driver porting

本文主要是介绍usb ohci driver porting，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1.kernel
 Device Drivers  ---> 
 SCSI device support  --->  
 <*> SCSI device support
 <*> SCSI disk support
U盘用到了SCSI
USB大容量存储设备利用SCSI（Small Computer System Interface,小型计算机系统接口）协议
和主机系统通信
 [*] USB support  --->  
 <*>   Support for Host-side USB  
 <*>     USB Monitor
 <*>   USB Mass Storage support  
2.编译后下载
初始化错误
<3>s3c2410-ohci s3c2410-ohci: init err (00000000 0000)
 mach-smdk6410.c
 +#include <plat/regs-usb-hsotg-phy.h>
 +#ifdef CONFIG_USB_SUPPORT
+/* Initializes OTG Phy. to output 48M clock */
+void s3c_otg_phy_config(int enable) {
+ u32 val;
+
+ if (enable) {
+  __raw_writel(0x0, S3C_PHYPWR); /* Power up */
+
+  val = __raw_readl(S3C_PHYCLK);
+  val &= ~S3C_PHYCLK_CLKSEL_MASK;
+  __raw_writel(val, S3C_PHYCLK);
+
+  __raw_writel(0x1, S3C_RSTCON);
+  udelay(5);
+  __raw_writel(0x0, S3C_RSTCON); /* Finish the reset */
+  udelay(5);
+ } else {
+  __raw_writel(0x19, S3C_PHYPWR); /* Power down */
+ }
+}
+EXPORT_SYMBOL(s3c_otg_phy_config);
+#endif
+
+
----------------------------------------------------
drivers/usb/host/hoci-s3c2410.c
--- samsung/drivers/usb/host/ohci-s3c2410.c 2012-02-07 11:12:07.893644925 +0800
+++ android2.3_kernel_v1.01/drivers/usb/host/ohci-s3c2410.c 2011-05-23 17:04:07.000000000 +0800
@@ -25,10 +25,12 @@
 
 #define valid_port(idx) ((idx) == 1 || (idx) == 2)
 
+extern void s3c_otg_phy_config(int enable);
+
 /* clock device associated with the hcd */
 
 static struct clk *clk;
-static struct clk *usb_clk;
+static struct clk *otg_clk, *usb_clk;
 
 /* forward definitions */
 
@@ -47,6 +49,10 @@
 
  dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
 
+ clk_enable(otg_clk);
+ s3c_otg_phy_config(1);
+
+
  clk_enable(usb_clk);
  mdelay(2);   /* let the bus clock stabilise */
 
@@ -79,6 +85,7 @@
 
  clk_disable(clk);
  clk_disable(usb_clk);
+ clk_disable(otg_clk);
 }
 
 /* ohci_s3c2410_hub_status_data
@@ -354,7 +361,7 @@
 
  hcd->rsrc_start = dev->resource[0].start;
  hcd->rsrc_len   = dev->resource[0].end - dev->resource[0].start + 1;
-    printk("------------%s----------\n", __func__);
+
  if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
   dev_err(&dev->dev, "request_mem_region failed\n");
   retval = -EBUSY;
@@ -375,6 +382,13 @@
   goto err_clk;
  }
 
+ otg_clk = clk_get(&dev->dev, "otg");
+ if (IS_ERR(otg_clk)) {
+  dev_err(&dev->dev, "cannot get otg clock\n");
+  retval = -ENOENT;
+  goto err_otg;
+ }
+
  s3c2410_start_hc(dev, hcd);
 
  hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
@@ -395,6 +409,10 @@
  err_ioremap:
  s3c2410_stop_hc(dev);
  iounmap(hcd->regs);
+
+ clk_put(otg_clk);
+
+ err_otg:
  clk_put(usb_clk);
 
  err_clk:
@@ -415,10 +433,8 @@
 {
  struct ohci_hcd *ohci = hcd_to_ohci (hcd);
  int ret;
-
  if ((ret = ohci_init(ohci)) < 0)
   return ret;
-
  if ((ret = ohci_run (ohci)) < 0) {
   err ("can't start %s", hcd->self.bus_name);
   ohci_stop (hcd);
3.mknod /dev/sda1 b 8 0
mount -t vfat /dev/sda1 /mnt
4.lsusb
lsusb
Bus 001 Device 001: ID 1d6b:0001
Bus 001 Device 002: ID 8644:800b
5.
[/sys/devices/platform/s3c-hsotg]# cat modalias
platform:s3c-hsotg
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