usb-ohci-ep93xx.c

ep9315平台下USB驱动的源码

/*
 *  linux/drivers/usb/usb-ohci-ep93xx.c
 *
 *  The outline of this code was taken from Brad Parkers <[e-mail]>
 *  original OHCI driver modifications, and reworked into a cleaner form
 *  by Russell King <[e-mail]>.
 */
#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 <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/pci.h>

#if defined(CONFIG_ARCH_EP93XX)
extern struct pci_pool *pci_pool_create(const char *name, struct pci_dev *dev,
					size_t size, size_t align,
					size_t allocation, int flags);
extern void pci_pool_destroy(struct pci_pool *pool);
extern void *pci_pool_alloc(struct pci_pool *pool, int flags,
			    dma_addr_t *handle);
extern void pci_pool_free(struct pci_pool *pool, void *vaddr, dma_addr_t addr);
#endif
#include "usb-ohci.h"

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

extern void hc_remove_ohci(ohci_t *ohci);

static ohci_t *ep93xx_ohci;

static void __init ep93xx_ohci_configure(void)
{
#if defined(CONFIG_ARCH_EDB9312) || defined(CONFIG_ARCH_EDB9315)
	unsigned int uiPBDR, uiPBDDR;
#endif
     
	/*
	 * Configure the power sense and control lines.  Place the USB
	 * host controller in reset.
	 */
#if defined(CONFIG_ARCH_EDB9312) || defined(CONFIG_ARCH_EDB9315)
	/*
	 * For EDB9315 boards, turn on USB by clearing EGPIO9.
	 */
	uiPBDR = inl(GPIO_PBDR) & 0xfd;
	outl( uiPBDR, GPIO_PBDR );

	uiPBDDR = inl(GPIO_PBDDR) | 0x02;
	outl( uiPBDDR, GPIO_PBDDR );
#endif

	/*
	 * Now, carefully enable the USB clock, and take
	 * the USB host controller out of reset.
	 */
	writel (readl ((void *)SYSCON_PWRCNT) | (1<< 28),(void *)SYSCON_PWRCNT);

}

static int __init ep93xx_ohci_init(void)
{
	int ret;

	/*
	 * Only support USB on rev D1 and later chips.
         */
	if((inl(SYSCON_CHIPID) >> 28) <= 3)
		return -EBUSY;

	ep93xx_ohci_configure();

	/*
	 * Initialise the generic OHCI driver.
	 */
	ret = hc_add_ohci((struct pci_dev *)1, IRQ_USH,
			  (void *)USB_BASE, 0,  "usb-ohci", "ep93xx");

	return ret;
}

static void __exit ep93xx_ohci_exit(void)
{
	hc_remove_ohci(ep93xx_ohci);

	/*
	 * Put the USB host controller into reset.
	 */

	/*
	 * Stop the USB clock.
	 */
}

module_init(ep93xx_ohci_init);
module_exit(ep93xx_ohci_exit);