usb_uhci.c

uboot详细解读可用启动引导LINUX2.6内核

/*
 * Part of this code has been derived from linux:
 * Universal Host Controller Interface driver for USB (take II).
 *
 * (c) 1999-2001 Georg Acher, [e-mail] (executive slave) (base guitar)
 *               Deti Fliegl, [e-mail] (executive slave) (lead voice)
 *               Thomas Sailer, [e-mail] (chief consultant) (cheer leader)
 *               Roman Weissgaerber, [e-mail] (virt root hub) (studio porter)
 * (c) 2000      Yggdrasil Computing, Inc. (port of new PCI interface support
 *               from usb-ohci.c by Adam Richter, [e-mail]).
 * (C) 2000      David Brownell, [e-mail] (usb-ohci.c)
 *
 * HW-initalization based on material of
 *
 * (C) Copyright 1999 Linus Torvalds
 * (C) Copyright 1999 Johannes Erdfelt
 * (C) Copyright 1999 Randy Dunlap
 * (C) Copyright 1999 Gregory P. Smith
 *
 *
 * Adapted for U-Boot:
 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
 * (C) Copyright 2008, Daniel Hellstr鰉, [e-mail]
 *     Added AMBA Plug&Play detection of GRUSB, modified interrupt handler.
 *     Added cache flushes where needed.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 *
 */

/**********************************************************************
 * How it works:
 * -------------
 * The framelist / Transfer descriptor / Queue Heads are similar like
 * in the linux usb_uhci.c.
 *
 * During initialization, the following skeleton is allocated in init_skel:
 *
 *         framespecific           |           common chain
 *
 * framelist[]
 * [  0 ]-----> TD ---------\
 * [  1 ]-----> TD ----------> TD ------> QH -------> QH -------> QH ---> NULL
 *   ...        TD ---------/
 * [1023]-----> TD --------/
 *
 *              ^^             ^^         ^^          ^^          ^^
 *              7 TDs for      1 TD for   Start of    Start of    End Chain
 *              INT (2-128ms)  1ms-INT    CTRL Chain  BULK Chain
 *
 *
 * Since this is a bootloader, the isochronous transfer descriptor have been removed.
 *
 * Interrupt Transfers.
 * --------------------
 * For Interupt transfers USB_MAX_TEMP_INT_TD Transfer descriptor are available. They
 * will be inserted after the appropriate (depending the interval setting) skeleton TD.
 * If an interrupt has been detected the dev->irqhandler is called. The status and number
 * of transfered bytes is stored in dev->irq_status resp. dev->irq_act_len. If the
 * dev->irqhandler returns 0, the interrupt TD is removed and disabled. If an 1 is returned,
 * the interrupt TD will be reactivated.
 *
 * Control Transfers
 * -----------------
 * Control Transfers are issued by filling the tmp_td with the appropriate data and connect
 * them to the qh_cntrl queue header. Before other control/bulk transfers can be issued,
 * the programm has to wait for completion. This does not allows asynchronous data transfer.
 *
 * Bulk Transfers
 * --------------
 * Bulk Transfers are issued by filling the tmp_td with the appropriate data and connect
 * them to the qh_bulk queue header. Before other control/bulk transfers can be issued,
 * the programm has to wait for completion. This does not allows asynchronous data transfer.
 *
 *
 */

#include <common.h>
#include <ambapp.h>
#include <asm/leon.h>
#include <asm/leon3.h>
#include <asm/processor.h>

#ifdef CONFIG_USB_UHCI

#include <usb.h>
#include "usb_uhci.h"

#define USB_MAX_TEMP_TD      128	/* number of temporary TDs for bulk and control transfers */
#define USB_MAX_TEMP_INT_TD  32	/* number of temporary TDs for Interrupt transfers */

extern int leon3_snooping_avail;
/*
#define out16r(address,data) (*(unsigned short *)(address) = \
 (unsigned short)( \
 (((unsigned short)(data)&0xff)<<8) | \
 (((unsigned short)(data)&0xff00)>>8) \
 ))
 */
#define out16r(address,data) _out16r((unsigned int)(address), (unsigned short)(data))
void _out16r(unsigned int address, unsigned short data)
{
	unsigned short val = (unsigned short)((((unsigned short)(data) & 0xff)
					       << 8) | (((unsigned short)(data)
							 & 0xff00) >> 8));
#ifdef UHCI_DEBUG_REGS
	printf("out16r(0x%lx,0x%04x = 0x%04x)\n", address, val, data);
#endif
	*(unsigned short *)(address) = val;
}

#define out32r(address,data) _out32r((unsigned int)(address), (unsigned int)(data))
void _out32r(unsigned int address, unsigned int data)
{
	unsigned int val = (unsigned int)((((unsigned int)(data) & 0x000000ff)
					   << 24) | (((unsigned int)(data) &
						      0x0000ff00) << 8) |
					  (((unsigned int)(data) & 0x00ff0000)
					   >> 8) | (((unsigned int)(data) &
						     0xff000000) >> 24));
#ifdef UHCI_DEBUG_REGS
	printf("out32r(0x%lx,0x%lx = 0x%lx)\n", address, val, data);
#endif
	*(unsigned int *)address = val;
}

#define in16r(address) _in16r((unsigned int)(address))
unsigned short _in16r(unsigned int address)
{
	unsigned short val = sparc_load_reg_cachemiss_word(address);
	val = ((val << 8) & 0xff00) | ((val >> 8) & 0xff);
#ifdef UHCI_DEBUG_REGS
	printf("in16r(0x%lx): 0x%04x\n", address, val);
#endif
	return val;
}

#define in32r(address) _in32r((unsigned int)(address))
unsigned int _in32r(unsigned int address)
{
	unsigned int val = sparc_load_reg_cachemiss(address);
	val =
	    ((val << 24) & 0xff000000) | ((val << 8) & 0xff0000) | ((val >> 8) &
								    0xff00) |
	    ((val >> 24) & 0xff);
#ifdef UHCI_DEBUG_REGS
	printf("in32r(0x%lx): 0x%08x\n", address, val);
#endif
	return val;
}

#define READ32(address) sparc_load_reg_cachemiss((unsigned int)(address))

/*#define USB_UHCI_DEBUG*/
#undef USB_UHCI_DEBUG

void usb_show_td(int max);
#ifdef	USB_UHCI_DEBUG
void grusb_show_regs(void);
#define	USB_UHCI_PRINTF(fmt,args...)	printf (fmt ,##args)
#else
#define USB_UHCI_PRINTF(fmt,args...)
#endif

static int grusb_irq = -1;	/* irq vector, if -1 uhci is stopped / reseted */
unsigned int usb_base_addr;	/* base address */

static uhci_td_t td_int[8] __attribute__ ((aligned(16)));	/* Interrupt Transfer descriptors */
static uhci_qh_t qh_cntrl __attribute__ ((aligned(16)));	/* control Queue Head */
static uhci_qh_t qh_bulk __attribute__ ((aligned(16)));	/*  bulk Queue Head */
static uhci_qh_t qh_end __attribute__ ((aligned(16)));	/* end Queue Head */
static uhci_td_t td_last __attribute__ ((aligned(16)));	/* last TD (linked with end chain) */

/* temporary tds */
static uhci_td_t tmp_td[USB_MAX_TEMP_TD] __attribute__ ((aligned(16)));	/* temporary bulk/control td's  */
static uhci_td_t tmp_int_td[USB_MAX_TEMP_INT_TD] __attribute__ ((aligned(16)));	/* temporary interrupt td's  */

static unsigned long framelist[1024] __attribute__ ((aligned(0x1000)));	/* frame list */

static struct virt_root_hub rh;	/* struct for root hub */

/**********************************************************************
 * some forward decleration
 */
int uhci_submit_rh_msg(struct usb_device *dev, unsigned long pipe,
		       void *buffer, int transfer_len,
		       struct devrequest *setup);

/* fill a td with the approproiate data. Link, status, info and buffer
 * are used by the USB controller itselfes, dev is used to identify the
 * "connected" device
 */
void usb_fill_td(uhci_td_t * td, unsigned long link, unsigned long status,
		 unsigned long info, unsigned long buffer, unsigned long dev)
{
	td->link = swap_32(link);
	td->status = swap_32(status);
	if ((info & UHCI_PID) == 0)
		info |= USB_PID_OUT;
	td->info = swap_32(info);
	td->buffer = swap_32(buffer);
	td->dev_ptr = dev;
}

/* fill a qh with the approproiate data. Head and element are used by the USB controller
 * itselfes. As soon as a valid dev_ptr is filled, a td chain is connected to the qh.
 * Please note, that after completion of the td chain, the entry element is removed /
 * marked invalid by the USB controller.
 */
void usb_fill_qh(uhci_qh_t * qh, unsigned long head, unsigned long element)
{
	qh->head = swap_32(head);
	qh->element = swap_32(element);
	qh->dev_ptr = 0L;
}

/* get the status of a td->status
 */
unsigned long usb_uhci_td_stat(unsigned long status)
{
	unsigned long result = 0;
	result |= (status & TD_CTRL_NAK) ? USB_ST_NAK_REC : 0;
	result |= (status & TD_CTRL_STALLED) ? USB_ST_STALLED : 0;
	result |= (status & TD_CTRL_DBUFERR) ? USB_ST_BUF_ERR : 0;
	result |= (status & TD_CTRL_BABBLE) ? USB_ST_BABBLE_DET : 0;
	result |= (status & TD_CTRL_CRCTIMEO) ? USB_ST_CRC_ERR : 0;
	result |= (status & TD_CTRL_BITSTUFF) ? USB_ST_BIT_ERR : 0;
	result |= (status & TD_CTRL_ACTIVE) ? USB_ST_NOT_PROC : 0;
	return result;
}

/* get the status and the transfered len of a td chain.
 * called from the completion handler
 */
int usb_get_td_status(uhci_td_t * td, struct usb_device *dev)
{
	unsigned long temp, info;
	unsigned long stat;
	uhci_td_t *mytd = td;

	if (dev->devnum == rh.devnum)
		return 0;
	dev->act_len = 0;
	stat = 0;
	do {
		temp = swap_32((unsigned long)READ32(&mytd->status));
		stat = usb_uhci_td_stat(temp);
		info = swap_32((unsigned long)READ32(&mytd->info));
		if (((info & 0xff) != USB_PID_SETUP) && (((info >> 21) & 0x7ff) != 0x7ff) && (temp & 0x7FF) != 0x7ff) {	/* if not setup and not null data pack */
			dev->act_len += (temp & 0x7FF) + 1;	/* the transfered len is act_len + 1 */
		}
		if (stat) {	/* status no ok */
			dev->status = stat;
			return -1;
		}
		temp = swap_32((unsigned long)READ32(&mytd->link));
		mytd = (uhci_td_t *) (temp & 0xfffffff0);
	} while ((temp & 0x1) == 0);	/* process all TDs */
	dev->status = stat;
	return 0;		/* Ok */
}

/*-------------------------------------------------------------------
 *                         LOW LEVEL STUFF
 *          assembles QHs und TDs for control, bulk and iso
 *-------------------------------------------------------------------*/
int dummy(void)
{
	USB_UHCI_PRINTF("DUMMY\n");
	return 0;
}

/* Submits a control message. That is a Setup, Data and Status transfer.
 * Routine does not wait for completion.
 */
int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
		       int transfer_len, struct devrequest *setup)
{
	unsigned long destination, status;
	int maxsze = usb_maxpacket(dev, pipe);
	unsigned long dataptr;
	int len;
	int pktsze;
	int i = 0;

	if (!maxsze) {
		USB_UHCI_PRINTF
		    ("uhci_submit_control_urb: pipesize for pipe %lx is zero\n",
		     pipe);
		return -1;
	}
	if (((pipe >> 8) & 0x7f) == rh.devnum) {
		/* this is the root hub -> redirect it */
		return uhci_submit_rh_msg(dev, pipe, buffer, transfer_len,
					  setup);
	}
	USB_UHCI_PRINTF("uhci_submit_control start len %x, maxsize %x\n",
			transfer_len, maxsze);
	/* The "pipe" thing contains the destination in bits 8--18 */
	destination = (pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;	/* Setup stage */
	/* 3 errors */
	status = (pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | (3 << 27);
	/* (urb->transfer_flags & USB_DISABLE_SPD ? 0 : TD_CTRL_SPD); */
	/*  Build the TD for the control request, try forever, 8 bytes of data */
	usb_fill_td(&tmp_td[i], UHCI_PTR_TERM, status, destination | (7 << 21),
		    (unsigned long)setup, (unsigned long)dev);
#ifdef DEBUG_EXTRA
	{
		char *sp = (char *)setup;
		printf("SETUP to pipe %lx: %x %x %x %x %x %x %x %x\n", pipe,
		       sp[0], sp[1], sp[2], sp[3], sp[4], sp[5], sp[6], sp[7]);
	}
#endif
	dataptr = (unsigned long)buffer;
	len = transfer_len;

	/* If direction is "send", change the frame from SETUP (0x2D)
	   to OUT (0xE1). Else change it from SETUP to IN (0x69). */
	destination =
	    (pipe & PIPE_DEVEP_MASK) | ((pipe & USB_DIR_IN) ==
					0 ? USB_PID_OUT : USB_PID_IN);
	while (len > 0) {
		/* data stage */
		pktsze = len;
		i++;
		if (pktsze > maxsze)
			pktsze = maxsze;
		destination ^= 1 << TD_TOKEN_TOGGLE;	/* toggle DATA0/1 */
		usb_fill_td(&tmp_td[i], UHCI_PTR_TERM, status, destination | ((pktsze - 1) << 21), dataptr, (unsigned long)dev);	/* Status, pktsze bytes of data */
		tmp_td[i - 1].link = swap_32((unsigned long)&tmp_td[i]);

		dataptr += pktsze;
		len -= pktsze;
	}

	/*  Build the final TD for control status */
	/* It's only IN if the pipe is out AND we aren't expecting data */

	destination &= ~UHCI_PID;
	if (((pipe & USB_DIR_IN) == 0) || (transfer_len == 0))
		destination |= USB_PID_IN;
	else
		destination |= USB_PID_OUT;
	destination |= 1 << TD_TOKEN_TOGGLE;	/* End in Data1 */
	i++;
	status &= ~TD_CTRL_SPD;
	/* no limit on errors on final packet , 0 bytes of data */
	usb_fill_td(&tmp_td[i], UHCI_PTR_TERM, status | TD_CTRL_IOC,
		    destination | (UHCI_NULL_DATA_SIZE << 21), 0,
		    (unsigned long)dev);
	tmp_td[i - 1].link = swap_32((unsigned long)&tmp_td[i]);	/* queue status td */
	/* usb_show_td(i+1); */
	USB_UHCI_PRINTF("uhci_submit_control end (%d tmp_tds used)\n", i);
	/* first mark the control QH element terminated */
	qh_cntrl.element = 0xffffffffL;
	/* set qh active */
	qh_cntrl.dev_ptr = (unsigned long)dev;
	/* fill in tmp_td_chain */
	dummy();
	qh_cntrl.element = swap_32((unsigned long)&tmp_td[0]);
	return 0;
}

/*-------------------------------------------------------------------
 * Prepare TDs for bulk transfers.
 */
int submit_bulk_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
		    int transfer_len)
{
	unsigned long destination, status, info;
	unsigned long dataptr;
	int maxsze = usb_maxpacket(dev, pipe);
	int len;
	int i = 0;

	if (transfer_len < 0) {
		printf("Negative transfer length in submit_bulk\n");
		return -1;
	}
	if (!maxsze)
		return -1;
	/* The "pipe" thing contains the destination in bits 8--18. */
	destination = (pipe & PIPE_DEVEP_MASK) | usb_packetid(pipe);
	/* 3 errors */
	status = (pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | (3 << 27);
	/*      ((urb->transfer_flags & USB_DISABLE_SPD) ? 0 : TD_CTRL_SPD) | (3 << 27); */
	/* Build the TDs for the bulk request */
	len = transfer_len;
	dataptr = (unsigned long)buffer;
	do {
		int pktsze = len;
		if (pktsze > maxsze)
			pktsze = maxsze;
		/* pktsze bytes of data  */
		info =
		    destination | (((pktsze - 1) & UHCI_NULL_DATA_SIZE) << 21) |
		    (usb_gettoggle
		     (dev, usb_pipeendpoint(pipe),
		      usb_pipeout(pipe)) << TD_TOKEN_TOGGLE);

		if ((len - pktsze) == 0)
			status |= TD_CTRL_IOC;	/* last one generates INT */

		usb_fill_td(&tmp_td[i], UHCI_PTR_TERM, status, info, dataptr, (unsigned long)dev);	/* Status, pktsze bytes of data */
		if (i > 0)
			tmp_td[i - 1].link = swap_32((unsigned long)&tmp_td[i]);
		i++;
		dataptr += pktsze;
		len -= pktsze;
		usb_dotoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
	} while (len > 0);
	/* first mark the bulk QH element terminated */
	qh_bulk.element = 0xffffffffL;
	/* set qh active */
	qh_bulk.dev_ptr = (unsigned long)dev;
	/* fill in tmp_td_chain */
	qh_bulk.element = swap_32((unsigned long)&tmp_td[0]);
	return 0;
}

/* search a free interrupt td