usb-ohci-s3c2410.c

基于S3CEB2410平台LINUX操作系统下 USB驱动源代码

/*
 *  linux/drivers/usb/usb-ohci-s3c2410.c
 *
 *  OHCI r1.0 compatible, CPU embedded USB host controller
 *
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/pci.h>

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>

#define OHCI_HW_DRIVER 1
#include "usb-ohci.h"

/*
 * S3C2410 user's guide 俊 乐绰 1厘 楼府 汲疙俊 狼窍搁,
 * OHCI 龋券捞扼绊 茄促.
 *
 * UPLL 汲沥苞 MISC 饭瘤胶磐俊辑 器飘 磷捞绊 混府绊 窍绰 巴阑 哗冈瘤 富 巴.
 *
 * 弊府绊, s3c2410 俊辑 USB slave 甫 静妨搁 host 器飘 窍唱甫 磷咯具 茄促绰 巴
 * 镭瘤 富 巴.
 * 窍瘤父, 捞犯霸 秦档 slave 脚龋啊 root hub 率俊 林绰 康氢阑 阜阑 规过捞 绝促.
 * hub.c 甫 绊媚辑 root hub 捞绊, 1 host port 肺 config 沁阑 版快,
 * 滴 锅掳 器飘甫 酒抗 媚促档 焊瘤 臼档废 沁栏聪 曼绊且 巴.
 */

int __devinit
hc_add_ohci(struct pci_dev *dev, int irq, void *membase, unsigned long flags,
	    ohci_t **ohci, const char *name, const char *slot_name);
extern void hc_remove_ohci(ohci_t *ohci);

static ohci_t *s3c2410_ohci;

static void __init s3c2410_ohci_configure(void)
{
#if CONFIG_MAX_ROOT_PORTS < 2
	/* 1 host port, 1 slave port*/
	MISCCR &= ~MISCCR_USBPAD;

#if 0 // confused - bushi
	/* wakeup port 0 */
	MISCCR &= ~MISCCR_USB0_SUSPEND;
	/* sleep port 1 */
	MISCCR |= MISCCR_USB1_SUSPEND;
#endif

#else
	/* 2 host port */
	MISCCR |= MISCCR_USBPAD;

#if 0 // confused - bushi
	/* wakeup port 0 */
	MISCCR &= ~MISCCR_USB0_SUSPEND;
	/* wakeup port 1 */
	MISCCR &= ~MISCCR_USB1_SUSPEND;
#endif

#endif

	/* UPLLCON */
	UPLLCON = FInsrt(0x78, fPLL_MDIV) | FInsrt(0x02, fPLL_PDIV) 
		| FInsrt(0x03, fPLL_SDIV);

	/* CLKCON */
	CLKCON |= CLKCON_USBH;

	udelay(11);
}

static int __init s3c2410_ohci_init(void)
{
	int ret;

	s3c2410_ohci_configure();

	/*
	 * Initialise the generic OHCI driver.
	 */
	// FIXME : io_p2v() ?
	ret = hc_add_ohci((struct pci_dev *)1, IRQ_USBH,
			  (void *)(io_p2v(USBHOST_CTL_BASE)), 0, &s3c2410_ohci,
			  "usb-ohci", "s3c2410");

	return ret;
}

static void __exit s3c2410_ohci_exit(void)
{
	hc_remove_ohci(s3c2410_ohci);

	/*
	 * Stop the USB clock.
	 */
	CLKCON &= ~CLKCON_USBH;
}

module_init(s3c2410_ohci_init);
module_exit(s3c2410_ohci_exit);