usb-ocp-ohci.c

S3C2440ARM9开发板的USB驱动程序

/*
 * URB OCP OHCI HCD (Host Controller Driver) for USB.
 * (C) Copyright 2002 MontaVista Software 
 * 	current Mantainer:
 * 		Armin Kuster <[e-mail]>
 *
 * 
 * (C) Copyright 1999 Roman Weissgaerber <[e-mail]>
 * (C) Copyright 2000-2001 David Brownell <[e-mail]>
 * 
 * [ Initialisation is based on Linus'  ]
 * [ uhci code and gregs ohci fragments ]
 * [ (C) Copyright 1999 Linus Torvalds  ]
 * [ (C) Copyright 1999 Gregory P. Smith]
 * 
 * 
 * History:
 * 
 * 2002/earlier: Ported to OCP support and from initail driver from
 * 	Brad on the redwood. 
 *	based on usb-ohci.c v 5.3
 *	The OCP bus is Big Endian so the le32* is
 *	not needed
 *
 * v1.0 2002/03/27 initial release
 */
 
#include <linux/config.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>  /* for in_interrupt() */
#undef DEBUG
#include <linux/usb.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/unaligned.h>

#define OHCI_USE_NPS		// force NoPowerSwitching mode
// #define OHCI_VERBOSE_DEBUG	/* not always helpful */

#include "usb-ohci.h"

#undef readl
#undef writel
#define readl(addr) in_be32(addr)
#define writel(b,addr) out_be32(addr, b)
#define CPU_TO_LE32(x) (x)
#define CPU_TO_LE16(x) (x)
#define LE32_TO_CPUP(p)	(*(__u32*)(p))
#define LE16_TO_CPUP(p)	(*(__u16*)(p))
#define LE16_TO_CPU(x)	(x)
#define LE32_TO_CPU(x)	(x)

static void *ocp_ohci;
static struct pci_dev dev;


/*
 * Version Information
 */
#define DRIVER_VERSION "v1.0"
#define DRIVER_AUTHOR "Armin Kuster <akuster@mvista>, Brad Parker"
#define DRIVER_DESC "USB OCP OHCI Host Controller Driver"

/* For initializing controller (mask in an HCFS mode too) */
#define	OHCI_CONTROL_INIT \
	(OHCI_CTRL_CBSR & 0x3) | OHCI_CTRL_IE | OHCI_CTRL_PLE

#define OHCI_UNLINK_TIMEOUT	(HZ / 10)

static LIST_HEAD (ohci_hcd_list);
static spinlock_t usb_ed_lock = SPIN_LOCK_UNLOCKED;


#define USB_ZERO_PACKET         0x0040  // Finish bulk OUTs always with zero length packet
#define min_t(type,x,y) \
	({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
#define max_t(type,x,y) \
	({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })

/*-------------------------------------------------------------------------*/

/* AMD-756 (D2 rev) reports corrupt register contents in some cases.
 * The erratum (#4) description is incorrect.  AMD's workaround waits
 * till some bits (mostly reserved) are clear; ok for all revs.
 */
#define read_roothub(hc, register, mask) ({ \
	u32 temp = readl (&hc->regs->roothub.register); \
	if (hc->flags & OHCI_QUIRK_AMD756) \
		while (temp & mask) \
			temp = readl (&hc->regs->roothub.register); \
	temp; })

static u32 roothub_a (struct ohci *hc)
	{ return read_roothub (hc, a, 0xfc0fe000); }
static inline u32 roothub_b (struct ohci *hc)
	{ return readl (&hc->regs->roothub.b); }
static inline u32 roothub_status (struct ohci *hc)
	{ return readl (&hc->regs->roothub.status); }
static u32 roothub_portstatus (struct ohci *hc, int i)
	{ return read_roothub (hc, portstatus [i], 0xffe0fce0); }


/*-------------------------------------------------------------------------*
 * URB support functions 
 *-------------------------------------------------------------------------*/ 
 
/* free HCD-private data associated with this URB */

static void urb_free_priv (struct ohci *hc, urb_priv_t * urb_priv)
{
	int		i;
	int		last = urb_priv->length - 1;
	int		len;
	int		dir;
	struct td	*td;

	if (last >= 0) {

		/* ISOC, BULK, INTR data buffer starts at td 0 
		 * CTRL setup starts at td 0 */
		td = urb_priv->td [0];

		len = td->urb->transfer_buffer_length,
		dir = usb_pipeout (td->urb->pipe)
					? PCI_DMA_TODEVICE
					: PCI_DMA_FROMDEVICE;

		/* unmap CTRL URB setup */
		if (usb_pipecontrol (td->urb->pipe)) {
			pci_unmap_single (hc->ohci_dev, 
					td->data_dma, 8, PCI_DMA_TODEVICE);
			
			/* CTRL data buffer starts at td 1 if len > 0 */
			if (len && last > 0)
				td = urb_priv->td [1]; 		
		} 

		/* unmap data buffer */
		if (len && td->data_dma)
			pci_unmap_single (hc->ohci_dev, td->data_dma, len, dir);
		
		for (i = 0; i <= last; i++) {
			td = urb_priv->td [i];
			if (td)
				td_free (hc, td);
		}
	}

	kfree (urb_priv);
}
 
static void urb_rm_priv_locked (urb_t * urb) 
{
	urb_priv_t * urb_priv = urb->hcpriv;
	
	if (urb_priv) {
		urb->hcpriv = NULL;

		if (urb->dev == NULL) {
			printk("urb_rm_priv_locked(urb=%p) dev=NULL!\n", urb);
			return;
		}


#ifdef	DO_TIMEOUTS
		if (urb->timeout) {
			list_del (&urb->urb_list);
			urb->timeout -= jiffies;
		}
#endif

		/* Release int/iso bandwidth */
		if (urb->bandwidth) {
			switch (usb_pipetype(urb->pipe)) {
			case PIPE_INTERRUPT:
				usb_release_bandwidth (urb->dev, urb, 0);
				break;
			case PIPE_ISOCHRONOUS:
				usb_release_bandwidth (urb->dev, urb, 1);
				break;
			default:
				break;
			}
		}

if (urb->dev->bus)
		urb_free_priv ((struct ohci *)urb->dev->bus->hcpriv, urb_priv);
else printk("urb_rm_priv_locked(urb=%p) usb->dev->bus=NULL!\n", urb);
		usb_dec_dev_use (urb->dev);
		urb->dev = NULL;
	}
}

static void urb_rm_priv (urb_t * urb)
{
	unsigned long flags;

	spin_lock_irqsave (&usb_ed_lock, flags);
	urb_rm_priv_locked (urb);
	spin_unlock_irqrestore (&usb_ed_lock, flags);
}

/*-------------------------------------------------------------------------*/
 
#ifdef DEBUG
static int sohci_get_current_frame_number (struct usb_device * dev);

/* debug| print the main components of an URB     
 * small: 0) header + data packets 1) just header */
 
static void urb_print (urb_t * urb, char * str, int small)
{
	unsigned int pipe= urb->pipe;
	
	if (!urb->dev) {
		dbg("%s URB: no dev", str);
		return;
	}
	if (!urb->dev->bus) {
		dbg("%s URB: no bus, urb=%p, usb->dev=%p",
		    str, urb, urb->dev);
		return;
	}
	
#ifndef	OHCI_VERBOSE_DEBUG
	if (urb->status != 0)
#endif
	dbg("%s URB:[%4x] dev:%2d,ep:%2d-%c,type:%s,flags:%4x,len:%d/%d,stat:%d(%x)", 
			str,
		 	sohci_get_current_frame_number (urb->dev), 
		 	usb_pipedevice (pipe),
		 	usb_pipeendpoint (pipe), 
		 	usb_pipeout (pipe)? 'O': 'I',
		 	usb_pipetype (pipe) < 2? (usb_pipeint (pipe)? "INTR": "ISOC"):
		 		(usb_pipecontrol (pipe)? "CTRL": "BULK"),
		 	urb->transfer_flags, 
		 	urb->actual_length, 
		 	urb->transfer_buffer_length,
		 	urb->status, urb->status);
#ifdef	OHCI_VERBOSE_DEBUG
	if (!small) {
		int i, len;

		if (usb_pipecontrol (pipe)) {
			printk (KERN_DEBUG __FILE__ ": cmd(8):");
			for (i = 0; i < 8 ; i++) 
				printk (" %02x", ((__u8 *) urb->setup_packet) [i]);
			printk ("\n");
		}
		if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
			printk (KERN_DEBUG __FILE__ ": data(%d/%d):", 
				urb->actual_length, 
				urb->transfer_buffer_length);
			len = usb_pipeout (pipe)? 
						urb->transfer_buffer_length: urb->actual_length;
			for (i = 0; i < 16 && i < len; i++) 
				printk (" %02x", ((__u8 *) urb->transfer_buffer) [i]);
			printk ("%s stat:%d\n", i < len? "...": "", urb->status);
		}
	} 
#endif
}

/* just for debugging; prints non-empty branches of the int ed tree inclusive iso eds*/
void ep_print_int_eds (ohci_t * ohci, char * str) {
	int i, j;
	 __u32 * ed_p;
return;
	for (i= 0; i < 32; i++) {
		j = 5;
		ed_p = &(ohci->hcca->int_table [i]);
		if (*ed_p == 0)
		    continue;
		printk (KERN_DEBUG __FILE__ ": %s branch int %2d(%2x):", str, i, i);
		while (*ed_p != 0 && j--) {
			ed_t *ed = dma_to_ed (ohci, LE32_TO_CPUP(ed_p));
			printk (" ed: %4x;", ed->hwINFO);
			ed_p = &ed->hwNextED;
		}
		printk ("\n");
	}
}


static void ohci_dump_intr_mask (char *label, __u32 mask)
{
	dbg ("%s: 0x%08x%s%s%s%s%s%s%s%s%s",
		label,
		mask,
		(mask & OHCI_INTR_MIE) ? " MIE" : "",
		(mask & OHCI_INTR_OC) ? " OC" : "",
		(mask & OHCI_INTR_RHSC) ? " RHSC" : "",
		(mask & OHCI_INTR_FNO) ? " FNO" : "",
		(mask & OHCI_INTR_UE) ? " UE" : "",
		(mask & OHCI_INTR_RD) ? " RD" : "",
		(mask & OHCI_INTR_SF) ? " SF" : "",
		(mask & OHCI_INTR_WDH) ? " WDH" : "",
		(mask & OHCI_INTR_SO) ? " SO" : ""
		);
}

static void maybe_print_eds (char *label, __u32 value)
{
	if (value)
		dbg ("%s %08x", label, value);
}

static char *hcfs2string (int state)
{
	switch (state) {
		case OHCI_USB_RESET:	return "reset";
		case OHCI_USB_RESUME:	return "resume";
		case OHCI_USB_OPER:	return "operational";
		case OHCI_USB_SUSPEND:	return "suspend";
	}
	return "?";
}

static void maybe_follow_tds (char *label, __u32 value)
{
	td_t *td = (td_t *)bus_to_virt(value);

	printk("%s %08x\n", label, value);

	while (value) {
		printk("td: %p (phys %p) index %d\n",
		       td, (void *)value, td->index);
		printk(" hwINFO %08x, hwCBP %08x, hwBE %08x, hwNextTD %08x\n",
		       td->hwINFO, td->hwCBP, td->hwBE, td->hwNextTD);
		printk(" ed %p, next_dl_td %p, urb %p\n",
		       td->ed, td->next_dl_td, td->urb);

		value = td->hwNextTD;
		td = (ed_t *)bus_to_virt(value);
	}
}

static void maybe_follow_eds (char *label, __u32 value)
{
	ed_t *ed = (ed_t *)bus_to_virt(value);

	printk("%s %08x\n", label, value);

	while (value) {
		printk("ed: %p (phys %p)\n", ed, (void *)value);
		printk(" hwINFO %08x, hwHeadP %08x, hwTailP %08x\n",
		       ed->hwINFO, ed->hwHeadP, ed->hwTailP);
		printk(" hwNextED %08x, ed_prev %p\n",
		       ed->hwNextED, ed->ed_prev);
		printk(" int period %d, branch %d, load %d, interval %d\n",
		       ed->int_period, ed->int_branch,
		       ed->int_load, ed->int_interval);
		printk(" state %d, type %d, last_iso %d\n",
		       ed->state, ed->type, ed->last_iso);

		maybe_follow_tds("hwHeadP", ed->hwHeadP);

		value = ed->hwNextED;
		ed = (ed_t *)bus_to_virt(value);
	}
}

// dump control and status registers
static void ohci_dump_status (ohci_t *controller)
{
	struct ohci_regs	*regs = controller->regs;
	__u32			temp;

	temp = readl (&regs->revision) & 0xff;
	if (temp != 0x10)
		dbg ("spec %d.%d", (temp >> 4), (temp & 0x0f));

	temp = readl (&regs->control);
	dbg ("control: 0x%08x%s%s%s HCFS=%s%s%s%s%s CBSR=%d", temp,
		(temp & OHCI_CTRL_RWE) ? " RWE" : "",
		(temp & OHCI_CTRL_RWC) ? " RWC" : "",
		(temp & OHCI_CTRL_IR) ? " IR" : "",
		hcfs2string (temp & OHCI_CTRL_HCFS),
		(temp & OHCI_CTRL_BLE) ? " BLE" : "",
		(temp & OHCI_CTRL_CLE) ? " CLE" : "",
		(temp & OHCI_CTRL_IE) ? " IE" : "",
		(temp & OHCI_CTRL_PLE) ? " PLE" : "",
		temp & OHCI_CTRL_CBSR
		);

	temp = readl (&regs->cmdstatus);
	dbg ("cmdstatus: 0x%08x SOC=%d%s%s%s%s", temp,
		(temp & OHCI_SOC) >> 16,
		(temp & OHCI_OCR) ? " OCR" : "",
		(temp & OHCI_BLF) ? " BLF" : "",
		(temp & OHCI_CLF) ? " CLF" : "",
		(temp & OHCI_HCR) ? " HCR" : ""
		);

	ohci_dump_intr_mask ("intrstatus", readl (&regs->intrstatus));
	ohci_dump_intr_mask ("intrenable", readl (&regs->intrenable));
	// intrdisable always same as intrenable
	// ohci_dump_intr_mask ("intrdisable", readl (&regs->intrdisable));

	maybe_print_eds ("ed_periodcurrent", readl (&regs->ed_periodcurrent));

	maybe_follow_eds ("ed_controlhead", readl (&regs->ed_controlhead));
	maybe_follow_eds ("ed_controlcurrent", readl (&regs->ed_controlcurrent));

	maybe_print_eds ("ed_bulkhead", readl (&regs->ed_bulkhead));
	maybe_print_eds ("ed_bulkcurrent", readl (&regs->ed_bulkcurrent));

	maybe_follow_tds ("donehead", readl (&regs->donehead));
}

static void ohci_dump_roothub (ohci_t *controller, int verbose)
{
	__u32			temp, ndp, i;

	temp = roothub_a (controller);
	ndp = (temp & RH_A_NDP);

	if (verbose) {
		dbg ("roothub.a: %08x POTPGT=%d%s%s%s%s%s NDP=%d", temp,
			((temp & RH_A_POTPGT) >> 24) & 0xff,
			(temp & RH_A_NOCP) ? " NOCP" : "",
			(temp & RH_A_OCPM) ? " OCPM" : "",
			(temp & RH_A_DT) ? " DT" : "",
			(temp & RH_A_NPS) ? " NPS" : "",
			(temp & RH_A_PSM) ? " PSM" : "",
			ndp
			);
		temp = roothub_b (controller);
		dbg ("roothub.b: %08x PPCM=%04x DR=%04x",
			temp,
			(temp & RH_B_PPCM) >> 16,
			(temp & RH_B_DR)
			);
		temp = roothub_status (controller);
		dbg ("roothub.status: %08x%s%s%s%s%s%s",
			temp,
			(temp & RH_HS_CRWE) ? " CRWE" : "",
			(temp & RH_HS_OCIC) ? " OCIC" : "",
			(temp & RH_HS_LPSC) ? " LPSC" : "",
			(temp & RH_HS_DRWE) ? " DRWE" : "",
			(temp & RH_HS_OCI) ? " OCI" : "",
			(temp & RH_HS_LPS) ? " LPS" : ""
			);
	}
	
	for (i = 0; i < ndp; i++) {
		temp = roothub_portstatus (controller, i);
		dbg ("roothub.portstatus [%d] = 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s",
			i,
			temp,
			(temp & RH_PS_PRSC) ? " PRSC" : "",
			(temp & RH_PS_OCIC) ? " OCIC" : "",
			(temp & RH_PS_PSSC) ? " PSSC" : "",
			(temp & RH_PS_PESC) ? " PESC" : "",
			(temp & RH_PS_CSC) ? " CSC" : "",

			(temp & RH_PS_LSDA) ? " LSDA" : "",
			(temp & RH_PS_PPS) ? " PPS" : "",
			(temp & RH_PS_PRS) ? " PRS" : "",
			(temp & RH_PS_POCI) ? " POCI" : "",
			(temp & RH_PS_PSS) ? " PSS" : "",