mirror of https://gitee.com/openkylin/linux.git
2899 lines
75 KiB
C
2899 lines
75 KiB
C
/*
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* Driver for the PLX NET2280 USB device controller.
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* Specs and errata are available from <http://www.plxtech.com>.
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*
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* PLX Technology Inc. (formerly NetChip Technology) supported the
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* development of this driver.
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*
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*
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* CODE STATUS HIGHLIGHTS
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*
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* This driver should work well with most "gadget" drivers, including
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* the File Storage, Serial, and Ethernet/RNDIS gadget drivers
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* as well as Gadget Zero and Gadgetfs.
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*
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* DMA is enabled by default. Drivers using transfer queues might use
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* DMA chaining to remove IRQ latencies between transfers. (Except when
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* short OUT transfers happen.) Drivers can use the req->no_interrupt
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* hint to completely eliminate some IRQs, if a later IRQ is guaranteed
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* and DMA chaining is enabled.
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*
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* Note that almost all the errata workarounds here are only needed for
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* rev1 chips. Rev1a silicon (0110) fixes almost all of them.
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*/
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/*
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* Copyright (C) 2003 David Brownell
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* Copyright (C) 2003-2005 PLX Technology, Inc.
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*
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* Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
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* with 2282 chip
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#undef DEBUG /* messages on error and most fault paths */
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#undef VERBOSE /* extra debug messages (success too) */
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/moduleparam.h>
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#include <linux/device.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/prefetch.h>
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#include <asm/byteorder.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/unaligned.h>
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#define DRIVER_DESC "PLX NET228x USB Peripheral Controller"
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#define DRIVER_VERSION "2005 Sept 27"
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#define DMA_ADDR_INVALID (~(dma_addr_t)0)
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#define EP_DONTUSE 13 /* nonzero */
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#define USE_RDK_LEDS /* GPIO pins control three LEDs */
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static const char driver_name [] = "net2280";
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static const char driver_desc [] = DRIVER_DESC;
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static const char ep0name [] = "ep0";
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static const char *const ep_name [] = {
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ep0name,
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"ep-a", "ep-b", "ep-c", "ep-d",
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"ep-e", "ep-f",
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};
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/* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO)
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* use_dma_chaining -- dma descriptor queueing gives even more irq reduction
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*
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* The net2280 DMA engines are not tightly integrated with their FIFOs;
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* not all cases are (yet) handled well in this driver or the silicon.
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* Some gadget drivers work better with the dma support here than others.
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* These two parameters let you use PIO or more aggressive DMA.
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*/
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static int use_dma = 1;
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static int use_dma_chaining = 0;
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/* "modprobe net2280 use_dma=n" etc */
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module_param (use_dma, bool, S_IRUGO);
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module_param (use_dma_chaining, bool, S_IRUGO);
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/* mode 0 == ep-{a,b,c,d} 1K fifo each
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* mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
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* mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
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*/
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static ushort fifo_mode = 0;
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/* "modprobe net2280 fifo_mode=1" etc */
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module_param (fifo_mode, ushort, 0644);
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/* enable_suspend -- When enabled, the driver will respond to
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* USB suspend requests by powering down the NET2280. Otherwise,
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* USB suspend requests will be ignored. This is acceptable for
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* self-powered devices
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*/
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static int enable_suspend = 0;
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/* "modprobe net2280 enable_suspend=1" etc */
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module_param (enable_suspend, bool, S_IRUGO);
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#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
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#if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG)
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static char *type_string (u8 bmAttributes)
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{
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switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
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case USB_ENDPOINT_XFER_BULK: return "bulk";
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case USB_ENDPOINT_XFER_ISOC: return "iso";
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case USB_ENDPOINT_XFER_INT: return "intr";
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};
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return "control";
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}
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#endif
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#include "net2280.h"
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#define valid_bit cpu_to_le32 (1 << VALID_BIT)
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#define dma_done_ie cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE)
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/*-------------------------------------------------------------------------*/
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static int
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net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
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{
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struct net2280 *dev;
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struct net2280_ep *ep;
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u32 max, tmp;
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unsigned long flags;
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ep = container_of (_ep, struct net2280_ep, ep);
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if (!_ep || !desc || ep->desc || _ep->name == ep0name
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|| desc->bDescriptorType != USB_DT_ENDPOINT)
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return -EINVAL;
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dev = ep->dev;
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if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
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return -ESHUTDOWN;
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/* erratum 0119 workaround ties up an endpoint number */
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if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE)
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return -EDOM;
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/* sanity check ep-e/ep-f since their fifos are small */
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max = usb_endpoint_maxp (desc) & 0x1fff;
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if (ep->num > 4 && max > 64)
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return -ERANGE;
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spin_lock_irqsave (&dev->lock, flags);
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_ep->maxpacket = max & 0x7ff;
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ep->desc = desc;
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/* ep_reset() has already been called */
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ep->stopped = 0;
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ep->wedged = 0;
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ep->out_overflow = 0;
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/* set speed-dependent max packet; may kick in high bandwidth */
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set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max);
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/* FIFO lines can't go to different packets. PIO is ok, so
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* use it instead of troublesome (non-bulk) multi-packet DMA.
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*/
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if (ep->dma && (max % 4) != 0 && use_dma_chaining) {
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DEBUG (ep->dev, "%s, no dma for maxpacket %d\n",
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ep->ep.name, ep->ep.maxpacket);
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ep->dma = NULL;
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}
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/* set type, direction, address; reset fifo counters */
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writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
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tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
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if (tmp == USB_ENDPOINT_XFER_INT) {
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/* erratum 0105 workaround prevents hs NYET */
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if (dev->chiprev == 0100
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&& dev->gadget.speed == USB_SPEED_HIGH
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&& !(desc->bEndpointAddress & USB_DIR_IN))
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writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE),
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&ep->regs->ep_rsp);
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} else if (tmp == USB_ENDPOINT_XFER_BULK) {
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/* catch some particularly blatant driver bugs */
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if ((dev->gadget.speed == USB_SPEED_HIGH
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&& max != 512)
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|| (dev->gadget.speed == USB_SPEED_FULL
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&& max > 64)) {
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spin_unlock_irqrestore (&dev->lock, flags);
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return -ERANGE;
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}
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}
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ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0;
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tmp <<= ENDPOINT_TYPE;
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tmp |= desc->bEndpointAddress;
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tmp |= (4 << ENDPOINT_BYTE_COUNT); /* default full fifo lines */
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tmp |= 1 << ENDPOINT_ENABLE;
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wmb ();
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/* for OUT transfers, block the rx fifo until a read is posted */
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ep->is_in = (tmp & USB_DIR_IN) != 0;
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if (!ep->is_in)
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writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
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else if (dev->pdev->device != 0x2280) {
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/* Added for 2282, Don't use nak packets on an in endpoint,
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* this was ignored on 2280
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*/
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writel ((1 << CLEAR_NAK_OUT_PACKETS)
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| (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
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}
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writel (tmp, &ep->regs->ep_cfg);
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/* enable irqs */
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if (!ep->dma) { /* pio, per-packet */
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tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
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writel (tmp, &dev->regs->pciirqenb0);
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tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
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| (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
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if (dev->pdev->device == 0x2280)
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tmp |= readl (&ep->regs->ep_irqenb);
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writel (tmp, &ep->regs->ep_irqenb);
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} else { /* dma, per-request */
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tmp = (1 << (8 + ep->num)); /* completion */
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tmp |= readl (&dev->regs->pciirqenb1);
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writel (tmp, &dev->regs->pciirqenb1);
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/* for short OUT transfers, dma completions can't
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* advance the queue; do it pio-style, by hand.
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* NOTE erratum 0112 workaround #2
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*/
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if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
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tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
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writel (tmp, &ep->regs->ep_irqenb);
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tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
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writel (tmp, &dev->regs->pciirqenb0);
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}
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}
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tmp = desc->bEndpointAddress;
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DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
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_ep->name, tmp & 0x0f, DIR_STRING (tmp),
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type_string (desc->bmAttributes),
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ep->dma ? "dma" : "pio", max);
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/* pci writes may still be posted */
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spin_unlock_irqrestore (&dev->lock, flags);
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return 0;
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}
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static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec)
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{
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u32 result;
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do {
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result = readl (ptr);
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if (result == ~(u32)0) /* "device unplugged" */
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return -ENODEV;
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result &= mask;
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if (result == done)
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return 0;
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udelay (1);
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usec--;
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} while (usec > 0);
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return -ETIMEDOUT;
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}
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static const struct usb_ep_ops net2280_ep_ops;
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static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep)
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{
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u32 tmp;
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ep->desc = NULL;
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INIT_LIST_HEAD (&ep->queue);
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ep->ep.maxpacket = ~0;
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ep->ep.ops = &net2280_ep_ops;
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/* disable the dma, irqs, endpoint... */
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if (ep->dma) {
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writel (0, &ep->dma->dmactl);
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writel ( (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
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| (1 << DMA_TRANSACTION_DONE_INTERRUPT)
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| (1 << DMA_ABORT)
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, &ep->dma->dmastat);
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tmp = readl (®s->pciirqenb0);
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tmp &= ~(1 << ep->num);
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writel (tmp, ®s->pciirqenb0);
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} else {
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tmp = readl (®s->pciirqenb1);
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tmp &= ~(1 << (8 + ep->num)); /* completion */
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writel (tmp, ®s->pciirqenb1);
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}
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writel (0, &ep->regs->ep_irqenb);
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/* init to our chosen defaults, notably so that we NAK OUT
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* packets until the driver queues a read (+note erratum 0112)
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*/
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if (!ep->is_in || ep->dev->pdev->device == 0x2280) {
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tmp = (1 << SET_NAK_OUT_PACKETS_MODE)
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| (1 << SET_NAK_OUT_PACKETS)
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| (1 << CLEAR_EP_HIDE_STATUS_PHASE)
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| (1 << CLEAR_INTERRUPT_MODE);
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} else {
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/* added for 2282 */
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tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE)
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| (1 << CLEAR_NAK_OUT_PACKETS)
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| (1 << CLEAR_EP_HIDE_STATUS_PHASE)
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| (1 << CLEAR_INTERRUPT_MODE);
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}
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if (ep->num != 0) {
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tmp |= (1 << CLEAR_ENDPOINT_TOGGLE)
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| (1 << CLEAR_ENDPOINT_HALT);
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}
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writel (tmp, &ep->regs->ep_rsp);
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/* scrub most status bits, and flush any fifo state */
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if (ep->dev->pdev->device == 0x2280)
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tmp = (1 << FIFO_OVERFLOW)
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| (1 << FIFO_UNDERFLOW);
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else
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tmp = 0;
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writel (tmp | (1 << TIMEOUT)
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| (1 << USB_STALL_SENT)
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| (1 << USB_IN_NAK_SENT)
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| (1 << USB_IN_ACK_RCVD)
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| (1 << USB_OUT_PING_NAK_SENT)
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| (1 << USB_OUT_ACK_SENT)
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| (1 << FIFO_FLUSH)
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| (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
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| (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
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| (1 << DATA_PACKET_RECEIVED_INTERRUPT)
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| (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
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| (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
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| (1 << DATA_IN_TOKEN_INTERRUPT)
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, &ep->regs->ep_stat);
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/* fifo size is handled separately */
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}
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static void nuke (struct net2280_ep *);
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static int net2280_disable (struct usb_ep *_ep)
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{
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struct net2280_ep *ep;
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unsigned long flags;
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ep = container_of (_ep, struct net2280_ep, ep);
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if (!_ep || !ep->desc || _ep->name == ep0name)
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return -EINVAL;
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spin_lock_irqsave (&ep->dev->lock, flags);
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nuke (ep);
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ep_reset (ep->dev->regs, ep);
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VDEBUG (ep->dev, "disabled %s %s\n",
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ep->dma ? "dma" : "pio", _ep->name);
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/* synch memory views with the device */
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(void) readl (&ep->regs->ep_cfg);
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if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4)
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ep->dma = &ep->dev->dma [ep->num - 1];
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spin_unlock_irqrestore (&ep->dev->lock, flags);
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return 0;
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}
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/*-------------------------------------------------------------------------*/
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static struct usb_request *
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net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
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{
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struct net2280_ep *ep;
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struct net2280_request *req;
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if (!_ep)
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return NULL;
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ep = container_of (_ep, struct net2280_ep, ep);
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req = kzalloc(sizeof(*req), gfp_flags);
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if (!req)
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return NULL;
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req->req.dma = DMA_ADDR_INVALID;
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INIT_LIST_HEAD (&req->queue);
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/* this dma descriptor may be swapped with the previous dummy */
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if (ep->dma) {
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struct net2280_dma *td;
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td = pci_pool_alloc (ep->dev->requests, gfp_flags,
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&req->td_dma);
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if (!td) {
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kfree (req);
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return NULL;
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}
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td->dmacount = 0; /* not VALID */
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td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
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td->dmadesc = td->dmaaddr;
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req->td = td;
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}
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return &req->req;
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}
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static void
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net2280_free_request (struct usb_ep *_ep, struct usb_request *_req)
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{
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struct net2280_ep *ep;
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struct net2280_request *req;
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ep = container_of (_ep, struct net2280_ep, ep);
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if (!_ep || !_req)
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return;
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req = container_of (_req, struct net2280_request, req);
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WARN_ON (!list_empty (&req->queue));
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if (req->td)
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pci_pool_free (ep->dev->requests, req->td, req->td_dma);
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kfree (req);
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}
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/*-------------------------------------------------------------------------*/
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/* load a packet into the fifo we use for usb IN transfers.
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* works for all endpoints.
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*
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* NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
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* at a time, but this code is simpler because it knows it only writes
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* one packet. ep-a..ep-d should use dma instead.
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*/
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static void
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write_fifo (struct net2280_ep *ep, struct usb_request *req)
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{
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struct net2280_ep_regs __iomem *regs = ep->regs;
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u8 *buf;
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u32 tmp;
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unsigned count, total;
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/* INVARIANT: fifo is currently empty. (testable) */
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if (req) {
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buf = req->buf + req->actual;
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prefetch (buf);
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total = req->length - req->actual;
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} else {
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total = 0;
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buf = NULL;
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}
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/* write just one packet at a time */
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count = ep->ep.maxpacket;
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if (count > total) /* min() cannot be used on a bitfield */
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count = total;
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VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
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ep->ep.name, count,
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(count != ep->ep.maxpacket) ? " (short)" : "",
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req);
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while (count >= 4) {
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/* NOTE be careful if you try to align these. fifo lines
|
|
* should normally be full (4 bytes) and successive partial
|
|
* lines are ok only in certain cases.
|
|
*/
|
|
tmp = get_unaligned ((u32 *)buf);
|
|
cpu_to_le32s (&tmp);
|
|
writel (tmp, ®s->ep_data);
|
|
buf += 4;
|
|
count -= 4;
|
|
}
|
|
|
|
/* last fifo entry is "short" unless we wrote a full packet.
|
|
* also explicitly validate last word in (periodic) transfers
|
|
* when maxpacket is not a multiple of 4 bytes.
|
|
*/
|
|
if (count || total < ep->ep.maxpacket) {
|
|
tmp = count ? get_unaligned ((u32 *)buf) : count;
|
|
cpu_to_le32s (&tmp);
|
|
set_fifo_bytecount (ep, count & 0x03);
|
|
writel (tmp, ®s->ep_data);
|
|
}
|
|
|
|
/* pci writes may still be posted */
|
|
}
|
|
|
|
/* work around erratum 0106: PCI and USB race over the OUT fifo.
|
|
* caller guarantees chiprev 0100, out endpoint is NAKing, and
|
|
* there's no real data in the fifo.
|
|
*
|
|
* NOTE: also used in cases where that erratum doesn't apply:
|
|
* where the host wrote "too much" data to us.
|
|
*/
|
|
static void out_flush (struct net2280_ep *ep)
|
|
{
|
|
u32 __iomem *statp;
|
|
u32 tmp;
|
|
|
|
ASSERT_OUT_NAKING (ep);
|
|
|
|
statp = &ep->regs->ep_stat;
|
|
writel ( (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
|
|
| (1 << DATA_PACKET_RECEIVED_INTERRUPT)
|
|
, statp);
|
|
writel ((1 << FIFO_FLUSH), statp);
|
|
mb ();
|
|
tmp = readl (statp);
|
|
if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
|
|
/* high speed did bulk NYET; fifo isn't filling */
|
|
&& ep->dev->gadget.speed == USB_SPEED_FULL) {
|
|
unsigned usec;
|
|
|
|
usec = 50; /* 64 byte bulk/interrupt */
|
|
handshake (statp, (1 << USB_OUT_PING_NAK_SENT),
|
|
(1 << USB_OUT_PING_NAK_SENT), usec);
|
|
/* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
|
|
}
|
|
}
|
|
|
|
/* unload packet(s) from the fifo we use for usb OUT transfers.
|
|
* returns true iff the request completed, because of short packet
|
|
* or the request buffer having filled with full packets.
|
|
*
|
|
* for ep-a..ep-d this will read multiple packets out when they
|
|
* have been accepted.
|
|
*/
|
|
static int
|
|
read_fifo (struct net2280_ep *ep, struct net2280_request *req)
|
|
{
|
|
struct net2280_ep_regs __iomem *regs = ep->regs;
|
|
u8 *buf = req->req.buf + req->req.actual;
|
|
unsigned count, tmp, is_short;
|
|
unsigned cleanup = 0, prevent = 0;
|
|
|
|
/* erratum 0106 ... packets coming in during fifo reads might
|
|
* be incompletely rejected. not all cases have workarounds.
|
|
*/
|
|
if (ep->dev->chiprev == 0x0100
|
|
&& ep->dev->gadget.speed == USB_SPEED_FULL) {
|
|
udelay (1);
|
|
tmp = readl (&ep->regs->ep_stat);
|
|
if ((tmp & (1 << NAK_OUT_PACKETS)))
|
|
cleanup = 1;
|
|
else if ((tmp & (1 << FIFO_FULL))) {
|
|
start_out_naking (ep);
|
|
prevent = 1;
|
|
}
|
|
/* else: hope we don't see the problem */
|
|
}
|
|
|
|
/* never overflow the rx buffer. the fifo reads packets until
|
|
* it sees a short one; we might not be ready for them all.
|
|
*/
|
|
prefetchw (buf);
|
|
count = readl (®s->ep_avail);
|
|
if (unlikely (count == 0)) {
|
|
udelay (1);
|
|
tmp = readl (&ep->regs->ep_stat);
|
|
count = readl (®s->ep_avail);
|
|
/* handled that data already? */
|
|
if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0)
|
|
return 0;
|
|
}
|
|
|
|
tmp = req->req.length - req->req.actual;
|
|
if (count > tmp) {
|
|
/* as with DMA, data overflow gets flushed */
|
|
if ((tmp % ep->ep.maxpacket) != 0) {
|
|
ERROR (ep->dev,
|
|
"%s out fifo %d bytes, expected %d\n",
|
|
ep->ep.name, count, tmp);
|
|
req->req.status = -EOVERFLOW;
|
|
cleanup = 1;
|
|
/* NAK_OUT_PACKETS will be set, so flushing is safe;
|
|
* the next read will start with the next packet
|
|
*/
|
|
} /* else it's a ZLP, no worries */
|
|
count = tmp;
|
|
}
|
|
req->req.actual += count;
|
|
|
|
is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
|
|
|
|
VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
|
|
ep->ep.name, count, is_short ? " (short)" : "",
|
|
cleanup ? " flush" : "", prevent ? " nak" : "",
|
|
req, req->req.actual, req->req.length);
|
|
|
|
while (count >= 4) {
|
|
tmp = readl (®s->ep_data);
|
|
cpu_to_le32s (&tmp);
|
|
put_unaligned (tmp, (u32 *)buf);
|
|
buf += 4;
|
|
count -= 4;
|
|
}
|
|
if (count) {
|
|
tmp = readl (®s->ep_data);
|
|
/* LE conversion is implicit here: */
|
|
do {
|
|
*buf++ = (u8) tmp;
|
|
tmp >>= 8;
|
|
} while (--count);
|
|
}
|
|
if (cleanup)
|
|
out_flush (ep);
|
|
if (prevent) {
|
|
writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
|
|
(void) readl (&ep->regs->ep_rsp);
|
|
}
|
|
|
|
return is_short || ((req->req.actual == req->req.length)
|
|
&& !req->req.zero);
|
|
}
|
|
|
|
/* fill out dma descriptor to match a given request */
|
|
static void
|
|
fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid)
|
|
{
|
|
struct net2280_dma *td = req->td;
|
|
u32 dmacount = req->req.length;
|
|
|
|
/* don't let DMA continue after a short OUT packet,
|
|
* so overruns can't affect the next transfer.
|
|
* in case of overruns on max-size packets, we can't
|
|
* stop the fifo from filling but we can flush it.
|
|
*/
|
|
if (ep->is_in)
|
|
dmacount |= (1 << DMA_DIRECTION);
|
|
if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0)
|
|
|| ep->dev->pdev->device != 0x2280)
|
|
dmacount |= (1 << END_OF_CHAIN);
|
|
|
|
req->valid = valid;
|
|
if (valid)
|
|
dmacount |= (1 << VALID_BIT);
|
|
if (likely(!req->req.no_interrupt || !use_dma_chaining))
|
|
dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE);
|
|
|
|
/* td->dmadesc = previously set by caller */
|
|
td->dmaaddr = cpu_to_le32 (req->req.dma);
|
|
|
|
/* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
|
|
wmb ();
|
|
td->dmacount = cpu_to_le32(dmacount);
|
|
}
|
|
|
|
static const u32 dmactl_default =
|
|
(1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
|
|
| (1 << DMA_CLEAR_COUNT_ENABLE)
|
|
/* erratum 0116 workaround part 1 (use POLLING) */
|
|
| (POLL_100_USEC << DESCRIPTOR_POLLING_RATE)
|
|
| (1 << DMA_VALID_BIT_POLLING_ENABLE)
|
|
| (1 << DMA_VALID_BIT_ENABLE)
|
|
| (1 << DMA_SCATTER_GATHER_ENABLE)
|
|
/* erratum 0116 workaround part 2 (no AUTOSTART) */
|
|
| (1 << DMA_ENABLE);
|
|
|
|
static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma)
|
|
{
|
|
handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50);
|
|
}
|
|
|
|
static inline void stop_dma (struct net2280_dma_regs __iomem *dma)
|
|
{
|
|
writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl);
|
|
spin_stop_dma (dma);
|
|
}
|
|
|
|
static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma)
|
|
{
|
|
struct net2280_dma_regs __iomem *dma = ep->dma;
|
|
unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION);
|
|
|
|
if (ep->dev->pdev->device != 0x2280)
|
|
tmp |= (1 << END_OF_CHAIN);
|
|
|
|
writel (tmp, &dma->dmacount);
|
|
writel (readl (&dma->dmastat), &dma->dmastat);
|
|
|
|
writel (td_dma, &dma->dmadesc);
|
|
writel (dmactl, &dma->dmactl);
|
|
|
|
/* erratum 0116 workaround part 3: pci arbiter away from net2280 */
|
|
(void) readl (&ep->dev->pci->pcimstctl);
|
|
|
|
writel ((1 << DMA_START), &dma->dmastat);
|
|
|
|
if (!ep->is_in)
|
|
stop_out_naking (ep);
|
|
}
|
|
|
|
static void start_dma (struct net2280_ep *ep, struct net2280_request *req)
|
|
{
|
|
u32 tmp;
|
|
struct net2280_dma_regs __iomem *dma = ep->dma;
|
|
|
|
/* FIXME can't use DMA for ZLPs */
|
|
|
|
/* on this path we "know" there's no dma active (yet) */
|
|
WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE));
|
|
writel (0, &ep->dma->dmactl);
|
|
|
|
/* previous OUT packet might have been short */
|
|
if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat))
|
|
& (1 << NAK_OUT_PACKETS)) != 0) {
|
|
writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT),
|
|
&ep->regs->ep_stat);
|
|
|
|
tmp = readl (&ep->regs->ep_avail);
|
|
if (tmp) {
|
|
writel (readl (&dma->dmastat), &dma->dmastat);
|
|
|
|
/* transfer all/some fifo data */
|
|
writel (req->req.dma, &dma->dmaaddr);
|
|
tmp = min (tmp, req->req.length);
|
|
|
|
/* dma irq, faking scatterlist status */
|
|
req->td->dmacount = cpu_to_le32 (req->req.length - tmp);
|
|
writel ((1 << DMA_DONE_INTERRUPT_ENABLE)
|
|
| tmp, &dma->dmacount);
|
|
req->td->dmadesc = 0;
|
|
req->valid = 1;
|
|
|
|
writel ((1 << DMA_ENABLE), &dma->dmactl);
|
|
writel ((1 << DMA_START), &dma->dmastat);
|
|
return;
|
|
}
|
|
}
|
|
|
|
tmp = dmactl_default;
|
|
|
|
/* force packet boundaries between dma requests, but prevent the
|
|
* controller from automagically writing a last "short" packet
|
|
* (zero length) unless the driver explicitly said to do that.
|
|
*/
|
|
if (ep->is_in) {
|
|
if (likely ((req->req.length % ep->ep.maxpacket) != 0
|
|
|| req->req.zero)) {
|
|
tmp |= (1 << DMA_FIFO_VALIDATE);
|
|
ep->in_fifo_validate = 1;
|
|
} else
|
|
ep->in_fifo_validate = 0;
|
|
}
|
|
|
|
/* init req->td, pointing to the current dummy */
|
|
req->td->dmadesc = cpu_to_le32 (ep->td_dma);
|
|
fill_dma_desc (ep, req, 1);
|
|
|
|
if (!use_dma_chaining)
|
|
req->td->dmacount |= cpu_to_le32 (1 << END_OF_CHAIN);
|
|
|
|
start_queue (ep, tmp, req->td_dma);
|
|
}
|
|
|
|
static inline void
|
|
queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid)
|
|
{
|
|
struct net2280_dma *end;
|
|
dma_addr_t tmp;
|
|
|
|
/* swap new dummy for old, link; fill and maybe activate */
|
|
end = ep->dummy;
|
|
ep->dummy = req->td;
|
|
req->td = end;
|
|
|
|
tmp = ep->td_dma;
|
|
ep->td_dma = req->td_dma;
|
|
req->td_dma = tmp;
|
|
|
|
end->dmadesc = cpu_to_le32 (ep->td_dma);
|
|
|
|
fill_dma_desc (ep, req, valid);
|
|
}
|
|
|
|
static void
|
|
done (struct net2280_ep *ep, struct net2280_request *req, int status)
|
|
{
|
|
struct net2280 *dev;
|
|
unsigned stopped = ep->stopped;
|
|
|
|
list_del_init (&req->queue);
|
|
|
|
if (req->req.status == -EINPROGRESS)
|
|
req->req.status = status;
|
|
else
|
|
status = req->req.status;
|
|
|
|
dev = ep->dev;
|
|
if (req->mapped) {
|
|
pci_unmap_single (dev->pdev, req->req.dma, req->req.length,
|
|
ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
|
|
req->req.dma = DMA_ADDR_INVALID;
|
|
req->mapped = 0;
|
|
}
|
|
|
|
if (status && status != -ESHUTDOWN)
|
|
VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n",
|
|
ep->ep.name, &req->req, status,
|
|
req->req.actual, req->req.length);
|
|
|
|
/* don't modify queue heads during completion callback */
|
|
ep->stopped = 1;
|
|
spin_unlock (&dev->lock);
|
|
req->req.complete (&ep->ep, &req->req);
|
|
spin_lock (&dev->lock);
|
|
ep->stopped = stopped;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int
|
|
net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
|
|
{
|
|
struct net2280_request *req;
|
|
struct net2280_ep *ep;
|
|
struct net2280 *dev;
|
|
unsigned long flags;
|
|
|
|
/* we always require a cpu-view buffer, so that we can
|
|
* always use pio (as fallback or whatever).
|
|
*/
|
|
req = container_of (_req, struct net2280_request, req);
|
|
if (!_req || !_req->complete || !_req->buf
|
|
|| !list_empty (&req->queue))
|
|
return -EINVAL;
|
|
if (_req->length > (~0 & DMA_BYTE_COUNT_MASK))
|
|
return -EDOM;
|
|
ep = container_of (_ep, struct net2280_ep, ep);
|
|
if (!_ep || (!ep->desc && ep->num != 0))
|
|
return -EINVAL;
|
|
dev = ep->dev;
|
|
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
|
|
return -ESHUTDOWN;
|
|
|
|
/* FIXME implement PIO fallback for ZLPs with DMA */
|
|
if (ep->dma && _req->length == 0)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* set up dma mapping in case the caller didn't */
|
|
if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
|
|
_req->dma = pci_map_single (dev->pdev, _req->buf, _req->length,
|
|
ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
|
|
req->mapped = 1;
|
|
}
|
|
|
|
#if 0
|
|
VDEBUG (dev, "%s queue req %p, len %d buf %p\n",
|
|
_ep->name, _req, _req->length, _req->buf);
|
|
#endif
|
|
|
|
spin_lock_irqsave (&dev->lock, flags);
|
|
|
|
_req->status = -EINPROGRESS;
|
|
_req->actual = 0;
|
|
|
|
/* kickstart this i/o queue? */
|
|
if (list_empty (&ep->queue) && !ep->stopped) {
|
|
/* use DMA if the endpoint supports it, else pio */
|
|
if (ep->dma)
|
|
start_dma (ep, req);
|
|
else {
|
|
/* maybe there's no control data, just status ack */
|
|
if (ep->num == 0 && _req->length == 0) {
|
|
allow_status (ep);
|
|
done (ep, req, 0);
|
|
VDEBUG (dev, "%s status ack\n", ep->ep.name);
|
|
goto done;
|
|
}
|
|
|
|
/* PIO ... stuff the fifo, or unblock it. */
|
|
if (ep->is_in)
|
|
write_fifo (ep, _req);
|
|
else if (list_empty (&ep->queue)) {
|
|
u32 s;
|
|
|
|
/* OUT FIFO might have packet(s) buffered */
|
|
s = readl (&ep->regs->ep_stat);
|
|
if ((s & (1 << FIFO_EMPTY)) == 0) {
|
|
/* note: _req->short_not_ok is
|
|
* ignored here since PIO _always_
|
|
* stops queue advance here, and
|
|
* _req->status doesn't change for
|
|
* short reads (only _req->actual)
|
|
*/
|
|
if (read_fifo (ep, req)) {
|
|
done (ep, req, 0);
|
|
if (ep->num == 0)
|
|
allow_status (ep);
|
|
/* don't queue it */
|
|
req = NULL;
|
|
} else
|
|
s = readl (&ep->regs->ep_stat);
|
|
}
|
|
|
|
/* don't NAK, let the fifo fill */
|
|
if (req && (s & (1 << NAK_OUT_PACKETS)))
|
|
writel ((1 << CLEAR_NAK_OUT_PACKETS),
|
|
&ep->regs->ep_rsp);
|
|
}
|
|
}
|
|
|
|
} else if (ep->dma) {
|
|
int valid = 1;
|
|
|
|
if (ep->is_in) {
|
|
int expect;
|
|
|
|
/* preventing magic zlps is per-engine state, not
|
|
* per-transfer; irq logic must recover hiccups.
|
|
*/
|
|
expect = likely (req->req.zero
|
|
|| (req->req.length % ep->ep.maxpacket) != 0);
|
|
if (expect != ep->in_fifo_validate)
|
|
valid = 0;
|
|
}
|
|
queue_dma (ep, req, valid);
|
|
|
|
} /* else the irq handler advances the queue. */
|
|
|
|
ep->responded = 1;
|
|
if (req)
|
|
list_add_tail (&req->queue, &ep->queue);
|
|
done:
|
|
spin_unlock_irqrestore (&dev->lock, flags);
|
|
|
|
/* pci writes may still be posted */
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
dma_done (
|
|
struct net2280_ep *ep,
|
|
struct net2280_request *req,
|
|
u32 dmacount,
|
|
int status
|
|
)
|
|
{
|
|
req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
|
|
done (ep, req, status);
|
|
}
|
|
|
|
static void restart_dma (struct net2280_ep *ep);
|
|
|
|
static void scan_dma_completions (struct net2280_ep *ep)
|
|
{
|
|
/* only look at descriptors that were "naturally" retired,
|
|
* so fifo and list head state won't matter
|
|
*/
|
|
while (!list_empty (&ep->queue)) {
|
|
struct net2280_request *req;
|
|
u32 tmp;
|
|
|
|
req = list_entry (ep->queue.next,
|
|
struct net2280_request, queue);
|
|
if (!req->valid)
|
|
break;
|
|
rmb ();
|
|
tmp = le32_to_cpup (&req->td->dmacount);
|
|
if ((tmp & (1 << VALID_BIT)) != 0)
|
|
break;
|
|
|
|
/* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
|
|
* cases where DMA must be aborted; this code handles
|
|
* all non-abort DMA completions.
|
|
*/
|
|
if (unlikely (req->td->dmadesc == 0)) {
|
|
/* paranoia */
|
|
tmp = readl (&ep->dma->dmacount);
|
|
if (tmp & DMA_BYTE_COUNT_MASK)
|
|
break;
|
|
/* single transfer mode */
|
|
dma_done (ep, req, tmp, 0);
|
|
break;
|
|
} else if (!ep->is_in
|
|
&& (req->req.length % ep->ep.maxpacket) != 0) {
|
|
tmp = readl (&ep->regs->ep_stat);
|
|
|
|
/* AVOID TROUBLE HERE by not issuing short reads from
|
|
* your gadget driver. That helps avoids errata 0121,
|
|
* 0122, and 0124; not all cases trigger the warning.
|
|
*/
|
|
if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
|
|
WARNING (ep->dev, "%s lost packet sync!\n",
|
|
ep->ep.name);
|
|
req->req.status = -EOVERFLOW;
|
|
} else if ((tmp = readl (&ep->regs->ep_avail)) != 0) {
|
|
/* fifo gets flushed later */
|
|
ep->out_overflow = 1;
|
|
DEBUG (ep->dev, "%s dma, discard %d len %d\n",
|
|
ep->ep.name, tmp,
|
|
req->req.length);
|
|
req->req.status = -EOVERFLOW;
|
|
}
|
|
}
|
|
dma_done (ep, req, tmp, 0);
|
|
}
|
|
}
|
|
|
|
static void restart_dma (struct net2280_ep *ep)
|
|
{
|
|
struct net2280_request *req;
|
|
u32 dmactl = dmactl_default;
|
|
|
|
if (ep->stopped)
|
|
return;
|
|
req = list_entry (ep->queue.next, struct net2280_request, queue);
|
|
|
|
if (!use_dma_chaining) {
|
|
start_dma (ep, req);
|
|
return;
|
|
}
|
|
|
|
/* the 2280 will be processing the queue unless queue hiccups after
|
|
* the previous transfer:
|
|
* IN: wanted automagic zlp, head doesn't (or vice versa)
|
|
* DMA_FIFO_VALIDATE doesn't init from dma descriptors.
|
|
* OUT: was "usb-short", we must restart.
|
|
*/
|
|
if (ep->is_in && !req->valid) {
|
|
struct net2280_request *entry, *prev = NULL;
|
|
int reqmode, done = 0;
|
|
|
|
DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td);
|
|
ep->in_fifo_validate = likely (req->req.zero
|
|
|| (req->req.length % ep->ep.maxpacket) != 0);
|
|
if (ep->in_fifo_validate)
|
|
dmactl |= (1 << DMA_FIFO_VALIDATE);
|
|
list_for_each_entry (entry, &ep->queue, queue) {
|
|
__le32 dmacount;
|
|
|
|
if (entry == req)
|
|
continue;
|
|
dmacount = entry->td->dmacount;
|
|
if (!done) {
|
|
reqmode = likely (entry->req.zero
|
|
|| (entry->req.length
|
|
% ep->ep.maxpacket) != 0);
|
|
if (reqmode == ep->in_fifo_validate) {
|
|
entry->valid = 1;
|
|
dmacount |= valid_bit;
|
|
entry->td->dmacount = dmacount;
|
|
prev = entry;
|
|
continue;
|
|
} else {
|
|
/* force a hiccup */
|
|
prev->td->dmacount |= dma_done_ie;
|
|
done = 1;
|
|
}
|
|
}
|
|
|
|
/* walk the rest of the queue so unlinks behave */
|
|
entry->valid = 0;
|
|
dmacount &= ~valid_bit;
|
|
entry->td->dmacount = dmacount;
|
|
prev = entry;
|
|
}
|
|
}
|
|
|
|
writel (0, &ep->dma->dmactl);
|
|
start_queue (ep, dmactl, req->td_dma);
|
|
}
|
|
|
|
static void abort_dma (struct net2280_ep *ep)
|
|
{
|
|
/* abort the current transfer */
|
|
if (likely (!list_empty (&ep->queue))) {
|
|
/* FIXME work around errata 0121, 0122, 0124 */
|
|
writel ((1 << DMA_ABORT), &ep->dma->dmastat);
|
|
spin_stop_dma (ep->dma);
|
|
} else
|
|
stop_dma (ep->dma);
|
|
scan_dma_completions (ep);
|
|
}
|
|
|
|
/* dequeue ALL requests */
|
|
static void nuke (struct net2280_ep *ep)
|
|
{
|
|
struct net2280_request *req;
|
|
|
|
/* called with spinlock held */
|
|
ep->stopped = 1;
|
|
if (ep->dma)
|
|
abort_dma (ep);
|
|
while (!list_empty (&ep->queue)) {
|
|
req = list_entry (ep->queue.next,
|
|
struct net2280_request,
|
|
queue);
|
|
done (ep, req, -ESHUTDOWN);
|
|
}
|
|
}
|
|
|
|
/* dequeue JUST ONE request */
|
|
static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req)
|
|
{
|
|
struct net2280_ep *ep;
|
|
struct net2280_request *req;
|
|
unsigned long flags;
|
|
u32 dmactl;
|
|
int stopped;
|
|
|
|
ep = container_of (_ep, struct net2280_ep, ep);
|
|
if (!_ep || (!ep->desc && ep->num != 0) || !_req)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave (&ep->dev->lock, flags);
|
|
stopped = ep->stopped;
|
|
|
|
/* quiesce dma while we patch the queue */
|
|
dmactl = 0;
|
|
ep->stopped = 1;
|
|
if (ep->dma) {
|
|
dmactl = readl (&ep->dma->dmactl);
|
|
/* WARNING erratum 0127 may kick in ... */
|
|
stop_dma (ep->dma);
|
|
scan_dma_completions (ep);
|
|
}
|
|
|
|
/* make sure it's still queued on this endpoint */
|
|
list_for_each_entry (req, &ep->queue, queue) {
|
|
if (&req->req == _req)
|
|
break;
|
|
}
|
|
if (&req->req != _req) {
|
|
spin_unlock_irqrestore (&ep->dev->lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* queue head may be partially complete. */
|
|
if (ep->queue.next == &req->queue) {
|
|
if (ep->dma) {
|
|
DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name);
|
|
_req->status = -ECONNRESET;
|
|
abort_dma (ep);
|
|
if (likely (ep->queue.next == &req->queue)) {
|
|
// NOTE: misreports single-transfer mode
|
|
req->td->dmacount = 0; /* invalidate */
|
|
dma_done (ep, req,
|
|
readl (&ep->dma->dmacount),
|
|
-ECONNRESET);
|
|
}
|
|
} else {
|
|
DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name);
|
|
done (ep, req, -ECONNRESET);
|
|
}
|
|
req = NULL;
|
|
|
|
/* patch up hardware chaining data */
|
|
} else if (ep->dma && use_dma_chaining) {
|
|
if (req->queue.prev == ep->queue.next) {
|
|
writel (le32_to_cpu (req->td->dmadesc),
|
|
&ep->dma->dmadesc);
|
|
if (req->td->dmacount & dma_done_ie)
|
|
writel (readl (&ep->dma->dmacount)
|
|
| le32_to_cpu(dma_done_ie),
|
|
&ep->dma->dmacount);
|
|
} else {
|
|
struct net2280_request *prev;
|
|
|
|
prev = list_entry (req->queue.prev,
|
|
struct net2280_request, queue);
|
|
prev->td->dmadesc = req->td->dmadesc;
|
|
if (req->td->dmacount & dma_done_ie)
|
|
prev->td->dmacount |= dma_done_ie;
|
|
}
|
|
}
|
|
|
|
if (req)
|
|
done (ep, req, -ECONNRESET);
|
|
ep->stopped = stopped;
|
|
|
|
if (ep->dma) {
|
|
/* turn off dma on inactive queues */
|
|
if (list_empty (&ep->queue))
|
|
stop_dma (ep->dma);
|
|
else if (!ep->stopped) {
|
|
/* resume current request, or start new one */
|
|
if (req)
|
|
writel (dmactl, &ep->dma->dmactl);
|
|
else
|
|
start_dma (ep, list_entry (ep->queue.next,
|
|
struct net2280_request, queue));
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore (&ep->dev->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int net2280_fifo_status (struct usb_ep *_ep);
|
|
|
|
static int
|
|
net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
|
|
{
|
|
struct net2280_ep *ep;
|
|
unsigned long flags;
|
|
int retval = 0;
|
|
|
|
ep = container_of (_ep, struct net2280_ep, ep);
|
|
if (!_ep || (!ep->desc && ep->num != 0))
|
|
return -EINVAL;
|
|
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
|
|
return -ESHUTDOWN;
|
|
if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
|
|
== USB_ENDPOINT_XFER_ISOC)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave (&ep->dev->lock, flags);
|
|
if (!list_empty (&ep->queue))
|
|
retval = -EAGAIN;
|
|
else if (ep->is_in && value && net2280_fifo_status (_ep) != 0)
|
|
retval = -EAGAIN;
|
|
else {
|
|
VDEBUG (ep->dev, "%s %s %s\n", _ep->name,
|
|
value ? "set" : "clear",
|
|
wedged ? "wedge" : "halt");
|
|
/* set/clear, then synch memory views with the device */
|
|
if (value) {
|
|
if (ep->num == 0)
|
|
ep->dev->protocol_stall = 1;
|
|
else
|
|
set_halt (ep);
|
|
if (wedged)
|
|
ep->wedged = 1;
|
|
} else {
|
|
clear_halt (ep);
|
|
ep->wedged = 0;
|
|
}
|
|
(void) readl (&ep->regs->ep_rsp);
|
|
}
|
|
spin_unlock_irqrestore (&ep->dev->lock, flags);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int
|
|
net2280_set_halt(struct usb_ep *_ep, int value)
|
|
{
|
|
return net2280_set_halt_and_wedge(_ep, value, 0);
|
|
}
|
|
|
|
static int
|
|
net2280_set_wedge(struct usb_ep *_ep)
|
|
{
|
|
if (!_ep || _ep->name == ep0name)
|
|
return -EINVAL;
|
|
return net2280_set_halt_and_wedge(_ep, 1, 1);
|
|
}
|
|
|
|
static int
|
|
net2280_fifo_status (struct usb_ep *_ep)
|
|
{
|
|
struct net2280_ep *ep;
|
|
u32 avail;
|
|
|
|
ep = container_of (_ep, struct net2280_ep, ep);
|
|
if (!_ep || (!ep->desc && ep->num != 0))
|
|
return -ENODEV;
|
|
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
|
|
return -ESHUTDOWN;
|
|
|
|
avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1);
|
|
if (avail > ep->fifo_size)
|
|
return -EOVERFLOW;
|
|
if (ep->is_in)
|
|
avail = ep->fifo_size - avail;
|
|
return avail;
|
|
}
|
|
|
|
static void
|
|
net2280_fifo_flush (struct usb_ep *_ep)
|
|
{
|
|
struct net2280_ep *ep;
|
|
|
|
ep = container_of (_ep, struct net2280_ep, ep);
|
|
if (!_ep || (!ep->desc && ep->num != 0))
|
|
return;
|
|
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
|
|
return;
|
|
|
|
writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
|
|
(void) readl (&ep->regs->ep_rsp);
|
|
}
|
|
|
|
static const struct usb_ep_ops net2280_ep_ops = {
|
|
.enable = net2280_enable,
|
|
.disable = net2280_disable,
|
|
|
|
.alloc_request = net2280_alloc_request,
|
|
.free_request = net2280_free_request,
|
|
|
|
.queue = net2280_queue,
|
|
.dequeue = net2280_dequeue,
|
|
|
|
.set_halt = net2280_set_halt,
|
|
.set_wedge = net2280_set_wedge,
|
|
.fifo_status = net2280_fifo_status,
|
|
.fifo_flush = net2280_fifo_flush,
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int net2280_get_frame (struct usb_gadget *_gadget)
|
|
{
|
|
struct net2280 *dev;
|
|
unsigned long flags;
|
|
u16 retval;
|
|
|
|
if (!_gadget)
|
|
return -ENODEV;
|
|
dev = container_of (_gadget, struct net2280, gadget);
|
|
spin_lock_irqsave (&dev->lock, flags);
|
|
retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff;
|
|
spin_unlock_irqrestore (&dev->lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
static int net2280_wakeup (struct usb_gadget *_gadget)
|
|
{
|
|
struct net2280 *dev;
|
|
u32 tmp;
|
|
unsigned long flags;
|
|
|
|
if (!_gadget)
|
|
return 0;
|
|
dev = container_of (_gadget, struct net2280, gadget);
|
|
|
|
spin_lock_irqsave (&dev->lock, flags);
|
|
tmp = readl (&dev->usb->usbctl);
|
|
if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE))
|
|
writel (1 << GENERATE_RESUME, &dev->usb->usbstat);
|
|
spin_unlock_irqrestore (&dev->lock, flags);
|
|
|
|
/* pci writes may still be posted */
|
|
return 0;
|
|
}
|
|
|
|
static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value)
|
|
{
|
|
struct net2280 *dev;
|
|
u32 tmp;
|
|
unsigned long flags;
|
|
|
|
if (!_gadget)
|
|
return 0;
|
|
dev = container_of (_gadget, struct net2280, gadget);
|
|
|
|
spin_lock_irqsave (&dev->lock, flags);
|
|
tmp = readl (&dev->usb->usbctl);
|
|
if (value)
|
|
tmp |= (1 << SELF_POWERED_STATUS);
|
|
else
|
|
tmp &= ~(1 << SELF_POWERED_STATUS);
|
|
writel (tmp, &dev->usb->usbctl);
|
|
spin_unlock_irqrestore (&dev->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
|
|
{
|
|
struct net2280 *dev;
|
|
u32 tmp;
|
|
unsigned long flags;
|
|
|
|
if (!_gadget)
|
|
return -ENODEV;
|
|
dev = container_of (_gadget, struct net2280, gadget);
|
|
|
|
spin_lock_irqsave (&dev->lock, flags);
|
|
tmp = readl (&dev->usb->usbctl);
|
|
dev->softconnect = (is_on != 0);
|
|
if (is_on)
|
|
tmp |= (1 << USB_DETECT_ENABLE);
|
|
else
|
|
tmp &= ~(1 << USB_DETECT_ENABLE);
|
|
writel (tmp, &dev->usb->usbctl);
|
|
spin_unlock_irqrestore (&dev->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int net2280_start(struct usb_gadget *_gadget,
|
|
struct usb_gadget_driver *driver);
|
|
static int net2280_stop(struct usb_gadget *_gadget,
|
|
struct usb_gadget_driver *driver);
|
|
|
|
static const struct usb_gadget_ops net2280_ops = {
|
|
.get_frame = net2280_get_frame,
|
|
.wakeup = net2280_wakeup,
|
|
.set_selfpowered = net2280_set_selfpowered,
|
|
.pullup = net2280_pullup,
|
|
.udc_start = net2280_start,
|
|
.udc_stop = net2280_stop,
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
|
|
|
|
/* FIXME move these into procfs, and use seq_file.
|
|
* Sysfs _still_ doesn't behave for arbitrarily sized files,
|
|
* and also doesn't help products using this with 2.4 kernels.
|
|
*/
|
|
|
|
/* "function" sysfs attribute */
|
|
static ssize_t
|
|
show_function (struct device *_dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct net2280 *dev = dev_get_drvdata (_dev);
|
|
|
|
if (!dev->driver
|
|
|| !dev->driver->function
|
|
|| strlen (dev->driver->function) > PAGE_SIZE)
|
|
return 0;
|
|
return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function);
|
|
}
|
|
static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
|
|
|
|
static ssize_t net2280_show_registers(struct device *_dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct net2280 *dev;
|
|
char *next;
|
|
unsigned size, t;
|
|
unsigned long flags;
|
|
int i;
|
|
u32 t1, t2;
|
|
const char *s;
|
|
|
|
dev = dev_get_drvdata (_dev);
|
|
next = buf;
|
|
size = PAGE_SIZE;
|
|
spin_lock_irqsave (&dev->lock, flags);
|
|
|
|
if (dev->driver)
|
|
s = dev->driver->driver.name;
|
|
else
|
|
s = "(none)";
|
|
|
|
/* Main Control Registers */
|
|
t = scnprintf (next, size, "%s version " DRIVER_VERSION
|
|
", chiprev %04x, dma %s\n\n"
|
|
"devinit %03x fifoctl %08x gadget '%s'\n"
|
|
"pci irqenb0 %02x irqenb1 %08x "
|
|
"irqstat0 %04x irqstat1 %08x\n",
|
|
driver_name, dev->chiprev,
|
|
use_dma
|
|
? (use_dma_chaining ? "chaining" : "enabled")
|
|
: "disabled",
|
|
readl (&dev->regs->devinit),
|
|
readl (&dev->regs->fifoctl),
|
|
s,
|
|
readl (&dev->regs->pciirqenb0),
|
|
readl (&dev->regs->pciirqenb1),
|
|
readl (&dev->regs->irqstat0),
|
|
readl (&dev->regs->irqstat1));
|
|
size -= t;
|
|
next += t;
|
|
|
|
/* USB Control Registers */
|
|
t1 = readl (&dev->usb->usbctl);
|
|
t2 = readl (&dev->usb->usbstat);
|
|
if (t1 & (1 << VBUS_PIN)) {
|
|
if (t2 & (1 << HIGH_SPEED))
|
|
s = "high speed";
|
|
else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
|
|
s = "powered";
|
|
else
|
|
s = "full speed";
|
|
/* full speed bit (6) not working?? */
|
|
} else
|
|
s = "not attached";
|
|
t = scnprintf (next, size,
|
|
"stdrsp %08x usbctl %08x usbstat %08x "
|
|
"addr 0x%02x (%s)\n",
|
|
readl (&dev->usb->stdrsp), t1, t2,
|
|
readl (&dev->usb->ouraddr), s);
|
|
size -= t;
|
|
next += t;
|
|
|
|
/* PCI Master Control Registers */
|
|
|
|
/* DMA Control Registers */
|
|
|
|
/* Configurable EP Control Registers */
|
|
for (i = 0; i < 7; i++) {
|
|
struct net2280_ep *ep;
|
|
|
|
ep = &dev->ep [i];
|
|
if (i && !ep->desc)
|
|
continue;
|
|
|
|
t1 = readl (&ep->regs->ep_cfg);
|
|
t2 = readl (&ep->regs->ep_rsp) & 0xff;
|
|
t = scnprintf (next, size,
|
|
"\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
|
|
"irqenb %02x\n",
|
|
ep->ep.name, t1, t2,
|
|
(t2 & (1 << CLEAR_NAK_OUT_PACKETS))
|
|
? "NAK " : "",
|
|
(t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE))
|
|
? "hide " : "",
|
|
(t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR))
|
|
? "CRC " : "",
|
|
(t2 & (1 << CLEAR_INTERRUPT_MODE))
|
|
? "interrupt " : "",
|
|
(t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
|
|
? "status " : "",
|
|
(t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE))
|
|
? "NAKmode " : "",
|
|
(t2 & (1 << CLEAR_ENDPOINT_TOGGLE))
|
|
? "DATA1 " : "DATA0 ",
|
|
(t2 & (1 << CLEAR_ENDPOINT_HALT))
|
|
? "HALT " : "",
|
|
readl (&ep->regs->ep_irqenb));
|
|
size -= t;
|
|
next += t;
|
|
|
|
t = scnprintf (next, size,
|
|
"\tstat %08x avail %04x "
|
|
"(ep%d%s-%s)%s\n",
|
|
readl (&ep->regs->ep_stat),
|
|
readl (&ep->regs->ep_avail),
|
|
t1 & 0x0f, DIR_STRING (t1),
|
|
type_string (t1 >> 8),
|
|
ep->stopped ? "*" : "");
|
|
size -= t;
|
|
next += t;
|
|
|
|
if (!ep->dma)
|
|
continue;
|
|
|
|
t = scnprintf (next, size,
|
|
" dma\tctl %08x stat %08x count %08x\n"
|
|
"\taddr %08x desc %08x\n",
|
|
readl (&ep->dma->dmactl),
|
|
readl (&ep->dma->dmastat),
|
|
readl (&ep->dma->dmacount),
|
|
readl (&ep->dma->dmaaddr),
|
|
readl (&ep->dma->dmadesc));
|
|
size -= t;
|
|
next += t;
|
|
|
|
}
|
|
|
|
/* Indexed Registers */
|
|
// none yet
|
|
|
|
/* Statistics */
|
|
t = scnprintf (next, size, "\nirqs: ");
|
|
size -= t;
|
|
next += t;
|
|
for (i = 0; i < 7; i++) {
|
|
struct net2280_ep *ep;
|
|
|
|
ep = &dev->ep [i];
|
|
if (i && !ep->irqs)
|
|
continue;
|
|
t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs);
|
|
size -= t;
|
|
next += t;
|
|
|
|
}
|
|
t = scnprintf (next, size, "\n");
|
|
size -= t;
|
|
next += t;
|
|
|
|
spin_unlock_irqrestore (&dev->lock, flags);
|
|
|
|
return PAGE_SIZE - size;
|
|
}
|
|
static DEVICE_ATTR(registers, S_IRUGO, net2280_show_registers, NULL);
|
|
|
|
static ssize_t
|
|
show_queues (struct device *_dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct net2280 *dev;
|
|
char *next;
|
|
unsigned size;
|
|
unsigned long flags;
|
|
int i;
|
|
|
|
dev = dev_get_drvdata (_dev);
|
|
next = buf;
|
|
size = PAGE_SIZE;
|
|
spin_lock_irqsave (&dev->lock, flags);
|
|
|
|
for (i = 0; i < 7; i++) {
|
|
struct net2280_ep *ep = &dev->ep [i];
|
|
struct net2280_request *req;
|
|
int t;
|
|
|
|
if (i != 0) {
|
|
const struct usb_endpoint_descriptor *d;
|
|
|
|
d = ep->desc;
|
|
if (!d)
|
|
continue;
|
|
t = d->bEndpointAddress;
|
|
t = scnprintf (next, size,
|
|
"\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
|
|
ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
|
|
(t & USB_DIR_IN) ? "in" : "out",
|
|
({ char *val;
|
|
switch (d->bmAttributes & 0x03) {
|
|
case USB_ENDPOINT_XFER_BULK:
|
|
val = "bulk"; break;
|
|
case USB_ENDPOINT_XFER_INT:
|
|
val = "intr"; break;
|
|
default:
|
|
val = "iso"; break;
|
|
}; val; }),
|
|
usb_endpoint_maxp (d) & 0x1fff,
|
|
ep->dma ? "dma" : "pio", ep->fifo_size
|
|
);
|
|
} else /* ep0 should only have one transfer queued */
|
|
t = scnprintf (next, size, "ep0 max 64 pio %s\n",
|
|
ep->is_in ? "in" : "out");
|
|
if (t <= 0 || t > size)
|
|
goto done;
|
|
size -= t;
|
|
next += t;
|
|
|
|
if (list_empty (&ep->queue)) {
|
|
t = scnprintf (next, size, "\t(nothing queued)\n");
|
|
if (t <= 0 || t > size)
|
|
goto done;
|
|
size -= t;
|
|
next += t;
|
|
continue;
|
|
}
|
|
list_for_each_entry (req, &ep->queue, queue) {
|
|
if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc))
|
|
t = scnprintf (next, size,
|
|
"\treq %p len %d/%d "
|
|
"buf %p (dmacount %08x)\n",
|
|
&req->req, req->req.actual,
|
|
req->req.length, req->req.buf,
|
|
readl (&ep->dma->dmacount));
|
|
else
|
|
t = scnprintf (next, size,
|
|
"\treq %p len %d/%d buf %p\n",
|
|
&req->req, req->req.actual,
|
|
req->req.length, req->req.buf);
|
|
if (t <= 0 || t > size)
|
|
goto done;
|
|
size -= t;
|
|
next += t;
|
|
|
|
if (ep->dma) {
|
|
struct net2280_dma *td;
|
|
|
|
td = req->td;
|
|
t = scnprintf (next, size, "\t td %08x "
|
|
" count %08x buf %08x desc %08x\n",
|
|
(u32) req->td_dma,
|
|
le32_to_cpu (td->dmacount),
|
|
le32_to_cpu (td->dmaaddr),
|
|
le32_to_cpu (td->dmadesc));
|
|
if (t <= 0 || t > size)
|
|
goto done;
|
|
size -= t;
|
|
next += t;
|
|
}
|
|
}
|
|
}
|
|
|
|
done:
|
|
spin_unlock_irqrestore (&dev->lock, flags);
|
|
return PAGE_SIZE - size;
|
|
}
|
|
static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL);
|
|
|
|
|
|
#else
|
|
|
|
#define device_create_file(a,b) (0)
|
|
#define device_remove_file(a,b) do { } while (0)
|
|
|
|
#endif
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* another driver-specific mode might be a request type doing dma
|
|
* to/from another device fifo instead of to/from memory.
|
|
*/
|
|
|
|
static void set_fifo_mode (struct net2280 *dev, int mode)
|
|
{
|
|
/* keeping high bits preserves BAR2 */
|
|
writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
|
|
|
|
/* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
|
|
INIT_LIST_HEAD (&dev->gadget.ep_list);
|
|
list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list);
|
|
list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list);
|
|
switch (mode) {
|
|
case 0:
|
|
list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
|
|
list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list);
|
|
dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024;
|
|
break;
|
|
case 1:
|
|
dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048;
|
|
break;
|
|
case 2:
|
|
list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
|
|
dev->ep [1].fifo_size = 2048;
|
|
dev->ep [2].fifo_size = 1024;
|
|
break;
|
|
}
|
|
/* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
|
|
list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list);
|
|
list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list);
|
|
}
|
|
|
|
/* keeping it simple:
|
|
* - one bus driver, initted first;
|
|
* - one function driver, initted second
|
|
*
|
|
* most of the work to support multiple net2280 controllers would
|
|
* be to associate this gadget driver (yes?) with all of them, or
|
|
* perhaps to bind specific drivers to specific devices.
|
|
*/
|
|
|
|
static void usb_reset (struct net2280 *dev)
|
|
{
|
|
u32 tmp;
|
|
|
|
dev->gadget.speed = USB_SPEED_UNKNOWN;
|
|
(void) readl (&dev->usb->usbctl);
|
|
|
|
net2280_led_init (dev);
|
|
|
|
/* disable automatic responses, and irqs */
|
|
writel (0, &dev->usb->stdrsp);
|
|
writel (0, &dev->regs->pciirqenb0);
|
|
writel (0, &dev->regs->pciirqenb1);
|
|
|
|
/* clear old dma and irq state */
|
|
for (tmp = 0; tmp < 4; tmp++) {
|
|
struct net2280_ep *ep = &dev->ep [tmp + 1];
|
|
|
|
if (ep->dma)
|
|
abort_dma (ep);
|
|
}
|
|
writel (~0, &dev->regs->irqstat0),
|
|
writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
|
|
|
|
/* reset, and enable pci */
|
|
tmp = readl (&dev->regs->devinit)
|
|
| (1 << PCI_ENABLE)
|
|
| (1 << FIFO_SOFT_RESET)
|
|
| (1 << USB_SOFT_RESET)
|
|
| (1 << M8051_RESET);
|
|
writel (tmp, &dev->regs->devinit);
|
|
|
|
/* standard fifo and endpoint allocations */
|
|
set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0);
|
|
}
|
|
|
|
static void usb_reinit (struct net2280 *dev)
|
|
{
|
|
u32 tmp;
|
|
int init_dma;
|
|
|
|
/* use_dma changes are ignored till next device re-init */
|
|
init_dma = use_dma;
|
|
|
|
/* basic endpoint init */
|
|
for (tmp = 0; tmp < 7; tmp++) {
|
|
struct net2280_ep *ep = &dev->ep [tmp];
|
|
|
|
ep->ep.name = ep_name [tmp];
|
|
ep->dev = dev;
|
|
ep->num = tmp;
|
|
|
|
if (tmp > 0 && tmp <= 4) {
|
|
ep->fifo_size = 1024;
|
|
if (init_dma)
|
|
ep->dma = &dev->dma [tmp - 1];
|
|
} else
|
|
ep->fifo_size = 64;
|
|
ep->regs = &dev->epregs [tmp];
|
|
ep_reset (dev->regs, ep);
|
|
}
|
|
dev->ep [0].ep.maxpacket = 64;
|
|
dev->ep [5].ep.maxpacket = 64;
|
|
dev->ep [6].ep.maxpacket = 64;
|
|
|
|
dev->gadget.ep0 = &dev->ep [0].ep;
|
|
dev->ep [0].stopped = 0;
|
|
INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
|
|
|
|
/* we want to prevent lowlevel/insecure access from the USB host,
|
|
* but erratum 0119 means this enable bit is ignored
|
|
*/
|
|
for (tmp = 0; tmp < 5; tmp++)
|
|
writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg);
|
|
}
|
|
|
|
static void ep0_start (struct net2280 *dev)
|
|
{
|
|
writel ( (1 << CLEAR_EP_HIDE_STATUS_PHASE)
|
|
| (1 << CLEAR_NAK_OUT_PACKETS)
|
|
| (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
|
|
, &dev->epregs [0].ep_rsp);
|
|
|
|
/*
|
|
* hardware optionally handles a bunch of standard requests
|
|
* that the API hides from drivers anyway. have it do so.
|
|
* endpoint status/features are handled in software, to
|
|
* help pass tests for some dubious behavior.
|
|
*/
|
|
writel ( (1 << SET_TEST_MODE)
|
|
| (1 << SET_ADDRESS)
|
|
| (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP)
|
|
| (1 << GET_DEVICE_STATUS)
|
|
| (1 << GET_INTERFACE_STATUS)
|
|
, &dev->usb->stdrsp);
|
|
writel ( (1 << USB_ROOT_PORT_WAKEUP_ENABLE)
|
|
| (1 << SELF_POWERED_USB_DEVICE)
|
|
| (1 << REMOTE_WAKEUP_SUPPORT)
|
|
| (dev->softconnect << USB_DETECT_ENABLE)
|
|
| (1 << SELF_POWERED_STATUS)
|
|
, &dev->usb->usbctl);
|
|
|
|
/* enable irqs so we can see ep0 and general operation */
|
|
writel ( (1 << SETUP_PACKET_INTERRUPT_ENABLE)
|
|
| (1 << ENDPOINT_0_INTERRUPT_ENABLE)
|
|
, &dev->regs->pciirqenb0);
|
|
writel ( (1 << PCI_INTERRUPT_ENABLE)
|
|
| (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE)
|
|
| (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE)
|
|
| (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE)
|
|
| (1 << VBUS_INTERRUPT_ENABLE)
|
|
| (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE)
|
|
| (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE)
|
|
, &dev->regs->pciirqenb1);
|
|
|
|
/* don't leave any writes posted */
|
|
(void) readl (&dev->usb->usbctl);
|
|
}
|
|
|
|
/* when a driver is successfully registered, it will receive
|
|
* control requests including set_configuration(), which enables
|
|
* non-control requests. then usb traffic follows until a
|
|
* disconnect is reported. then a host may connect again, or
|
|
* the driver might get unbound.
|
|
*/
|
|
static int net2280_start(struct usb_gadget *_gadget,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
struct net2280 *dev;
|
|
int retval;
|
|
unsigned i;
|
|
|
|
/* insist on high speed support from the driver, since
|
|
* (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
|
|
* "must not be used in normal operation"
|
|
*/
|
|
if (!driver || driver->speed != USB_SPEED_HIGH
|
|
|| !driver->setup)
|
|
return -EINVAL;
|
|
|
|
dev = container_of (_gadget, struct net2280, gadget);
|
|
|
|
for (i = 0; i < 7; i++)
|
|
dev->ep [i].irqs = 0;
|
|
|
|
/* hook up the driver ... */
|
|
dev->softconnect = 1;
|
|
driver->driver.bus = NULL;
|
|
dev->driver = driver;
|
|
dev->gadget.dev.driver = &driver->driver;
|
|
|
|
retval = device_create_file (&dev->pdev->dev, &dev_attr_function);
|
|
if (retval) goto err_unbind;
|
|
retval = device_create_file (&dev->pdev->dev, &dev_attr_queues);
|
|
if (retval) goto err_func;
|
|
|
|
/* ... then enable host detection and ep0; and we're ready
|
|
* for set_configuration as well as eventual disconnect.
|
|
*/
|
|
net2280_led_active (dev, 1);
|
|
ep0_start (dev);
|
|
|
|
DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n",
|
|
driver->driver.name,
|
|
readl (&dev->usb->usbctl),
|
|
readl (&dev->usb->stdrsp));
|
|
|
|
/* pci writes may still be posted */
|
|
return 0;
|
|
|
|
err_func:
|
|
device_remove_file (&dev->pdev->dev, &dev_attr_function);
|
|
err_unbind:
|
|
driver->unbind (&dev->gadget);
|
|
dev->gadget.dev.driver = NULL;
|
|
dev->driver = NULL;
|
|
return retval;
|
|
}
|
|
|
|
static void
|
|
stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver)
|
|
{
|
|
int i;
|
|
|
|
/* don't disconnect if it's not connected */
|
|
if (dev->gadget.speed == USB_SPEED_UNKNOWN)
|
|
driver = NULL;
|
|
|
|
/* stop hardware; prevent new request submissions;
|
|
* and kill any outstanding requests.
|
|
*/
|
|
usb_reset (dev);
|
|
for (i = 0; i < 7; i++)
|
|
nuke (&dev->ep [i]);
|
|
|
|
usb_reinit (dev);
|
|
}
|
|
|
|
static int net2280_stop(struct usb_gadget *_gadget,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
struct net2280 *dev;
|
|
unsigned long flags;
|
|
|
|
dev = container_of (_gadget, struct net2280, gadget);
|
|
|
|
spin_lock_irqsave (&dev->lock, flags);
|
|
stop_activity (dev, driver);
|
|
spin_unlock_irqrestore (&dev->lock, flags);
|
|
|
|
dev->gadget.dev.driver = NULL;
|
|
dev->driver = NULL;
|
|
|
|
net2280_led_active (dev, 0);
|
|
device_remove_file (&dev->pdev->dev, &dev_attr_function);
|
|
device_remove_file (&dev->pdev->dev, &dev_attr_queues);
|
|
|
|
DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name);
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
|
|
* also works for dma-capable endpoints, in pio mode or just
|
|
* to manually advance the queue after short OUT transfers.
|
|
*/
|
|
static void handle_ep_small (struct net2280_ep *ep)
|
|
{
|
|
struct net2280_request *req;
|
|
u32 t;
|
|
/* 0 error, 1 mid-data, 2 done */
|
|
int mode = 1;
|
|
|
|
if (!list_empty (&ep->queue))
|
|
req = list_entry (ep->queue.next,
|
|
struct net2280_request, queue);
|
|
else
|
|
req = NULL;
|
|
|
|
/* ack all, and handle what we care about */
|
|
t = readl (&ep->regs->ep_stat);
|
|
ep->irqs++;
|
|
#if 0
|
|
VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n",
|
|
ep->ep.name, t, req ? &req->req : 0);
|
|
#endif
|
|
if (!ep->is_in || ep->dev->pdev->device == 0x2280)
|
|
writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat);
|
|
else
|
|
/* Added for 2282 */
|
|
writel (t, &ep->regs->ep_stat);
|
|
|
|
/* for ep0, monitor token irqs to catch data stage length errors
|
|
* and to synchronize on status.
|
|
*
|
|
* also, to defer reporting of protocol stalls ... here's where
|
|
* data or status first appears, handling stalls here should never
|
|
* cause trouble on the host side..
|
|
*
|
|
* control requests could be slightly faster without token synch for
|
|
* status, but status can jam up that way.
|
|
*/
|
|
if (unlikely (ep->num == 0)) {
|
|
if (ep->is_in) {
|
|
/* status; stop NAKing */
|
|
if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) {
|
|
if (ep->dev->protocol_stall) {
|
|
ep->stopped = 1;
|
|
set_halt (ep);
|
|
}
|
|
if (!req)
|
|
allow_status (ep);
|
|
mode = 2;
|
|
/* reply to extra IN data tokens with a zlp */
|
|
} else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
|
|
if (ep->dev->protocol_stall) {
|
|
ep->stopped = 1;
|
|
set_halt (ep);
|
|
mode = 2;
|
|
} else if (ep->responded &&
|
|
!req && !ep->stopped)
|
|
write_fifo (ep, NULL);
|
|
}
|
|
} else {
|
|
/* status; stop NAKing */
|
|
if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
|
|
if (ep->dev->protocol_stall) {
|
|
ep->stopped = 1;
|
|
set_halt (ep);
|
|
}
|
|
mode = 2;
|
|
/* an extra OUT token is an error */
|
|
} else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT))
|
|
&& req
|
|
&& req->req.actual == req->req.length)
|
|
|| (ep->responded && !req)) {
|
|
ep->dev->protocol_stall = 1;
|
|
set_halt (ep);
|
|
ep->stopped = 1;
|
|
if (req)
|
|
done (ep, req, -EOVERFLOW);
|
|
req = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (unlikely (!req))
|
|
return;
|
|
|
|
/* manual DMA queue advance after short OUT */
|
|
if (likely (ep->dma != 0)) {
|
|
if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
|
|
u32 count;
|
|
int stopped = ep->stopped;
|
|
|
|
/* TRANSFERRED works around OUT_DONE erratum 0112.
|
|
* we expect (N <= maxpacket) bytes; host wrote M.
|
|
* iff (M < N) we won't ever see a DMA interrupt.
|
|
*/
|
|
ep->stopped = 1;
|
|
for (count = 0; ; t = readl (&ep->regs->ep_stat)) {
|
|
|
|
/* any preceding dma transfers must finish.
|
|
* dma handles (M >= N), may empty the queue
|
|
*/
|
|
scan_dma_completions (ep);
|
|
if (unlikely (list_empty (&ep->queue)
|
|
|| ep->out_overflow)) {
|
|
req = NULL;
|
|
break;
|
|
}
|
|
req = list_entry (ep->queue.next,
|
|
struct net2280_request, queue);
|
|
|
|
/* here either (M < N), a "real" short rx;
|
|
* or (M == N) and the queue didn't empty
|
|
*/
|
|
if (likely (t & (1 << FIFO_EMPTY))) {
|
|
count = readl (&ep->dma->dmacount);
|
|
count &= DMA_BYTE_COUNT_MASK;
|
|
if (readl (&ep->dma->dmadesc)
|
|
!= req->td_dma)
|
|
req = NULL;
|
|
break;
|
|
}
|
|
udelay(1);
|
|
}
|
|
|
|
/* stop DMA, leave ep NAKing */
|
|
writel ((1 << DMA_ABORT), &ep->dma->dmastat);
|
|
spin_stop_dma (ep->dma);
|
|
|
|
if (likely (req)) {
|
|
req->td->dmacount = 0;
|
|
t = readl (&ep->regs->ep_avail);
|
|
dma_done (ep, req, count,
|
|
(ep->out_overflow || t)
|
|
? -EOVERFLOW : 0);
|
|
}
|
|
|
|
/* also flush to prevent erratum 0106 trouble */
|
|
if (unlikely (ep->out_overflow
|
|
|| (ep->dev->chiprev == 0x0100
|
|
&& ep->dev->gadget.speed
|
|
== USB_SPEED_FULL))) {
|
|
out_flush (ep);
|
|
ep->out_overflow = 0;
|
|
}
|
|
|
|
/* (re)start dma if needed, stop NAKing */
|
|
ep->stopped = stopped;
|
|
if (!list_empty (&ep->queue))
|
|
restart_dma (ep);
|
|
} else
|
|
DEBUG (ep->dev, "%s dma ep_stat %08x ??\n",
|
|
ep->ep.name, t);
|
|
return;
|
|
|
|
/* data packet(s) received (in the fifo, OUT) */
|
|
} else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) {
|
|
if (read_fifo (ep, req) && ep->num != 0)
|
|
mode = 2;
|
|
|
|
/* data packet(s) transmitted (IN) */
|
|
} else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) {
|
|
unsigned len;
|
|
|
|
len = req->req.length - req->req.actual;
|
|
if (len > ep->ep.maxpacket)
|
|
len = ep->ep.maxpacket;
|
|
req->req.actual += len;
|
|
|
|
/* if we wrote it all, we're usually done */
|
|
if (req->req.actual == req->req.length) {
|
|
if (ep->num == 0) {
|
|
/* send zlps until the status stage */
|
|
} else if (!req->req.zero || len != ep->ep.maxpacket)
|
|
mode = 2;
|
|
}
|
|
|
|
/* there was nothing to do ... */
|
|
} else if (mode == 1)
|
|
return;
|
|
|
|
/* done */
|
|
if (mode == 2) {
|
|
/* stream endpoints often resubmit/unlink in completion */
|
|
done (ep, req, 0);
|
|
|
|
/* maybe advance queue to next request */
|
|
if (ep->num == 0) {
|
|
/* NOTE: net2280 could let gadget driver start the
|
|
* status stage later. since not all controllers let
|
|
* them control that, the api doesn't (yet) allow it.
|
|
*/
|
|
if (!ep->stopped)
|
|
allow_status (ep);
|
|
req = NULL;
|
|
} else {
|
|
if (!list_empty (&ep->queue) && !ep->stopped)
|
|
req = list_entry (ep->queue.next,
|
|
struct net2280_request, queue);
|
|
else
|
|
req = NULL;
|
|
if (req && !ep->is_in)
|
|
stop_out_naking (ep);
|
|
}
|
|
}
|
|
|
|
/* is there a buffer for the next packet?
|
|
* for best streaming performance, make sure there is one.
|
|
*/
|
|
if (req && !ep->stopped) {
|
|
|
|
/* load IN fifo with next packet (may be zlp) */
|
|
if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT))
|
|
write_fifo (ep, &req->req);
|
|
}
|
|
}
|
|
|
|
static struct net2280_ep *
|
|
get_ep_by_addr (struct net2280 *dev, u16 wIndex)
|
|
{
|
|
struct net2280_ep *ep;
|
|
|
|
if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
|
|
return &dev->ep [0];
|
|
list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) {
|
|
u8 bEndpointAddress;
|
|
|
|
if (!ep->desc)
|
|
continue;
|
|
bEndpointAddress = ep->desc->bEndpointAddress;
|
|
if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
|
|
continue;
|
|
if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
|
|
return ep;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void handle_stat0_irqs (struct net2280 *dev, u32 stat)
|
|
{
|
|
struct net2280_ep *ep;
|
|
u32 num, scratch;
|
|
|
|
/* most of these don't need individual acks */
|
|
stat &= ~(1 << INTA_ASSERTED);
|
|
if (!stat)
|
|
return;
|
|
// DEBUG (dev, "irqstat0 %04x\n", stat);
|
|
|
|
/* starting a control request? */
|
|
if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) {
|
|
union {
|
|
u32 raw [2];
|
|
struct usb_ctrlrequest r;
|
|
} u;
|
|
int tmp;
|
|
struct net2280_request *req;
|
|
|
|
if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
|
|
if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED))
|
|
dev->gadget.speed = USB_SPEED_HIGH;
|
|
else
|
|
dev->gadget.speed = USB_SPEED_FULL;
|
|
net2280_led_speed (dev, dev->gadget.speed);
|
|
DEBUG(dev, "%s\n", usb_speed_string(dev->gadget.speed));
|
|
}
|
|
|
|
ep = &dev->ep [0];
|
|
ep->irqs++;
|
|
|
|
/* make sure any leftover request state is cleared */
|
|
stat &= ~(1 << ENDPOINT_0_INTERRUPT);
|
|
while (!list_empty (&ep->queue)) {
|
|
req = list_entry (ep->queue.next,
|
|
struct net2280_request, queue);
|
|
done (ep, req, (req->req.actual == req->req.length)
|
|
? 0 : -EPROTO);
|
|
}
|
|
ep->stopped = 0;
|
|
dev->protocol_stall = 0;
|
|
|
|
if (ep->dev->pdev->device == 0x2280)
|
|
tmp = (1 << FIFO_OVERFLOW)
|
|
| (1 << FIFO_UNDERFLOW);
|
|
else
|
|
tmp = 0;
|
|
|
|
writel (tmp | (1 << TIMEOUT)
|
|
| (1 << USB_STALL_SENT)
|
|
| (1 << USB_IN_NAK_SENT)
|
|
| (1 << USB_IN_ACK_RCVD)
|
|
| (1 << USB_OUT_PING_NAK_SENT)
|
|
| (1 << USB_OUT_ACK_SENT)
|
|
| (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
|
|
| (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
|
|
| (1 << DATA_PACKET_RECEIVED_INTERRUPT)
|
|
| (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
|
|
| (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
|
|
| (1 << DATA_IN_TOKEN_INTERRUPT)
|
|
, &ep->regs->ep_stat);
|
|
u.raw [0] = readl (&dev->usb->setup0123);
|
|
u.raw [1] = readl (&dev->usb->setup4567);
|
|
|
|
cpu_to_le32s (&u.raw [0]);
|
|
cpu_to_le32s (&u.raw [1]);
|
|
|
|
tmp = 0;
|
|
|
|
#define w_value le16_to_cpu(u.r.wValue)
|
|
#define w_index le16_to_cpu(u.r.wIndex)
|
|
#define w_length le16_to_cpu(u.r.wLength)
|
|
|
|
/* ack the irq */
|
|
writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0);
|
|
stat ^= (1 << SETUP_PACKET_INTERRUPT);
|
|
|
|
/* watch control traffic at the token level, and force
|
|
* synchronization before letting the status stage happen.
|
|
* FIXME ignore tokens we'll NAK, until driver responds.
|
|
* that'll mean a lot less irqs for some drivers.
|
|
*/
|
|
ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
|
|
if (ep->is_in) {
|
|
scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
|
|
| (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
|
|
| (1 << DATA_IN_TOKEN_INTERRUPT);
|
|
stop_out_naking (ep);
|
|
} else
|
|
scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT)
|
|
| (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
|
|
| (1 << DATA_IN_TOKEN_INTERRUPT);
|
|
writel (scratch, &dev->epregs [0].ep_irqenb);
|
|
|
|
/* we made the hardware handle most lowlevel requests;
|
|
* everything else goes uplevel to the gadget code.
|
|
*/
|
|
ep->responded = 1;
|
|
switch (u.r.bRequest) {
|
|
case USB_REQ_GET_STATUS: {
|
|
struct net2280_ep *e;
|
|
__le32 status;
|
|
|
|
/* hw handles device and interface status */
|
|
if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
|
|
goto delegate;
|
|
if ((e = get_ep_by_addr (dev, w_index)) == 0
|
|
|| w_length > 2)
|
|
goto do_stall;
|
|
|
|
if (readl (&e->regs->ep_rsp)
|
|
& (1 << SET_ENDPOINT_HALT))
|
|
status = cpu_to_le32 (1);
|
|
else
|
|
status = cpu_to_le32 (0);
|
|
|
|
/* don't bother with a request object! */
|
|
writel (0, &dev->epregs [0].ep_irqenb);
|
|
set_fifo_bytecount (ep, w_length);
|
|
writel ((__force u32)status, &dev->epregs [0].ep_data);
|
|
allow_status (ep);
|
|
VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status);
|
|
goto next_endpoints;
|
|
}
|
|
break;
|
|
case USB_REQ_CLEAR_FEATURE: {
|
|
struct net2280_ep *e;
|
|
|
|
/* hw handles device features */
|
|
if (u.r.bRequestType != USB_RECIP_ENDPOINT)
|
|
goto delegate;
|
|
if (w_value != USB_ENDPOINT_HALT
|
|
|| w_length != 0)
|
|
goto do_stall;
|
|
if ((e = get_ep_by_addr (dev, w_index)) == 0)
|
|
goto do_stall;
|
|
if (e->wedged) {
|
|
VDEBUG(dev, "%s wedged, halt not cleared\n",
|
|
ep->ep.name);
|
|
} else {
|
|
VDEBUG(dev, "%s clear halt\n", ep->ep.name);
|
|
clear_halt(e);
|
|
}
|
|
allow_status (ep);
|
|
goto next_endpoints;
|
|
}
|
|
break;
|
|
case USB_REQ_SET_FEATURE: {
|
|
struct net2280_ep *e;
|
|
|
|
/* hw handles device features */
|
|
if (u.r.bRequestType != USB_RECIP_ENDPOINT)
|
|
goto delegate;
|
|
if (w_value != USB_ENDPOINT_HALT
|
|
|| w_length != 0)
|
|
goto do_stall;
|
|
if ((e = get_ep_by_addr (dev, w_index)) == 0)
|
|
goto do_stall;
|
|
if (e->ep.name == ep0name)
|
|
goto do_stall;
|
|
set_halt (e);
|
|
allow_status (ep);
|
|
VDEBUG (dev, "%s set halt\n", ep->ep.name);
|
|
goto next_endpoints;
|
|
}
|
|
break;
|
|
default:
|
|
delegate:
|
|
VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x "
|
|
"ep_cfg %08x\n",
|
|
u.r.bRequestType, u.r.bRequest,
|
|
w_value, w_index, w_length,
|
|
readl (&ep->regs->ep_cfg));
|
|
ep->responded = 0;
|
|
spin_unlock (&dev->lock);
|
|
tmp = dev->driver->setup (&dev->gadget, &u.r);
|
|
spin_lock (&dev->lock);
|
|
}
|
|
|
|
/* stall ep0 on error */
|
|
if (tmp < 0) {
|
|
do_stall:
|
|
VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n",
|
|
u.r.bRequestType, u.r.bRequest, tmp);
|
|
dev->protocol_stall = 1;
|
|
}
|
|
|
|
/* some in/out token irq should follow; maybe stall then.
|
|
* driver must queue a request (even zlp) or halt ep0
|
|
* before the host times out.
|
|
*/
|
|
}
|
|
|
|
#undef w_value
|
|
#undef w_index
|
|
#undef w_length
|
|
|
|
next_endpoints:
|
|
/* endpoint data irq ? */
|
|
scratch = stat & 0x7f;
|
|
stat &= ~0x7f;
|
|
for (num = 0; scratch; num++) {
|
|
u32 t;
|
|
|
|
/* do this endpoint's FIFO and queue need tending? */
|
|
t = 1 << num;
|
|
if ((scratch & t) == 0)
|
|
continue;
|
|
scratch ^= t;
|
|
|
|
ep = &dev->ep [num];
|
|
handle_ep_small (ep);
|
|
}
|
|
|
|
if (stat)
|
|
DEBUG (dev, "unhandled irqstat0 %08x\n", stat);
|
|
}
|
|
|
|
#define DMA_INTERRUPTS ( \
|
|
(1 << DMA_D_INTERRUPT) \
|
|
| (1 << DMA_C_INTERRUPT) \
|
|
| (1 << DMA_B_INTERRUPT) \
|
|
| (1 << DMA_A_INTERRUPT))
|
|
#define PCI_ERROR_INTERRUPTS ( \
|
|
(1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \
|
|
| (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \
|
|
| (1 << PCI_RETRY_ABORT_INTERRUPT))
|
|
|
|
static void handle_stat1_irqs (struct net2280 *dev, u32 stat)
|
|
{
|
|
struct net2280_ep *ep;
|
|
u32 tmp, num, mask, scratch;
|
|
|
|
/* after disconnect there's nothing else to do! */
|
|
tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
|
|
mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED);
|
|
|
|
/* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
|
|
* Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
|
|
* both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
|
|
* only indicates a change in the reset state).
|
|
*/
|
|
if (stat & tmp) {
|
|
writel (tmp, &dev->regs->irqstat1);
|
|
if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT))
|
|
&& ((readl (&dev->usb->usbstat) & mask)
|
|
== 0))
|
|
|| ((readl (&dev->usb->usbctl)
|
|
& (1 << VBUS_PIN)) == 0)
|
|
) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) {
|
|
DEBUG (dev, "disconnect %s\n",
|
|
dev->driver->driver.name);
|
|
stop_activity (dev, dev->driver);
|
|
ep0_start (dev);
|
|
return;
|
|
}
|
|
stat &= ~tmp;
|
|
|
|
/* vBUS can bounce ... one of many reasons to ignore the
|
|
* notion of hotplug events on bus connect/disconnect!
|
|
*/
|
|
if (!stat)
|
|
return;
|
|
}
|
|
|
|
/* NOTE: chip stays in PCI D0 state for now, but it could
|
|
* enter D1 to save more power
|
|
*/
|
|
tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
|
|
if (stat & tmp) {
|
|
writel (tmp, &dev->regs->irqstat1);
|
|
if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) {
|
|
if (dev->driver->suspend)
|
|
dev->driver->suspend (&dev->gadget);
|
|
if (!enable_suspend)
|
|
stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
|
|
} else {
|
|
if (dev->driver->resume)
|
|
dev->driver->resume (&dev->gadget);
|
|
/* at high speed, note erratum 0133 */
|
|
}
|
|
stat &= ~tmp;
|
|
}
|
|
|
|
/* clear any other status/irqs */
|
|
if (stat)
|
|
writel (stat, &dev->regs->irqstat1);
|
|
|
|
/* some status we can just ignore */
|
|
if (dev->pdev->device == 0x2280)
|
|
stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
|
|
| (1 << SUSPEND_REQUEST_INTERRUPT)
|
|
| (1 << RESUME_INTERRUPT)
|
|
| (1 << SOF_INTERRUPT));
|
|
else
|
|
stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
|
|
| (1 << RESUME_INTERRUPT)
|
|
| (1 << SOF_DOWN_INTERRUPT)
|
|
| (1 << SOF_INTERRUPT));
|
|
|
|
if (!stat)
|
|
return;
|
|
// DEBUG (dev, "irqstat1 %08x\n", stat);
|
|
|
|
/* DMA status, for ep-{a,b,c,d} */
|
|
scratch = stat & DMA_INTERRUPTS;
|
|
stat &= ~DMA_INTERRUPTS;
|
|
scratch >>= 9;
|
|
for (num = 0; scratch; num++) {
|
|
struct net2280_dma_regs __iomem *dma;
|
|
|
|
tmp = 1 << num;
|
|
if ((tmp & scratch) == 0)
|
|
continue;
|
|
scratch ^= tmp;
|
|
|
|
ep = &dev->ep [num + 1];
|
|
dma = ep->dma;
|
|
|
|
if (!dma)
|
|
continue;
|
|
|
|
/* clear ep's dma status */
|
|
tmp = readl (&dma->dmastat);
|
|
writel (tmp, &dma->dmastat);
|
|
|
|
/* chaining should stop on abort, short OUT from fifo,
|
|
* or (stat0 codepath) short OUT transfer.
|
|
*/
|
|
if (!use_dma_chaining) {
|
|
if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT))
|
|
== 0) {
|
|
DEBUG (ep->dev, "%s no xact done? %08x\n",
|
|
ep->ep.name, tmp);
|
|
continue;
|
|
}
|
|
stop_dma (ep->dma);
|
|
}
|
|
|
|
/* OUT transfers terminate when the data from the
|
|
* host is in our memory. Process whatever's done.
|
|
* On this path, we know transfer's last packet wasn't
|
|
* less than req->length. NAK_OUT_PACKETS may be set,
|
|
* or the FIFO may already be holding new packets.
|
|
*
|
|
* IN transfers can linger in the FIFO for a very
|
|
* long time ... we ignore that for now, accounting
|
|
* precisely (like PIO does) needs per-packet irqs
|
|
*/
|
|
scan_dma_completions (ep);
|
|
|
|
/* disable dma on inactive queues; else maybe restart */
|
|
if (list_empty (&ep->queue)) {
|
|
if (use_dma_chaining)
|
|
stop_dma (ep->dma);
|
|
} else {
|
|
tmp = readl (&dma->dmactl);
|
|
if (!use_dma_chaining
|
|
|| (tmp & (1 << DMA_ENABLE)) == 0)
|
|
restart_dma (ep);
|
|
else if (ep->is_in && use_dma_chaining) {
|
|
struct net2280_request *req;
|
|
__le32 dmacount;
|
|
|
|
/* the descriptor at the head of the chain
|
|
* may still have VALID_BIT clear; that's
|
|
* used to trigger changing DMA_FIFO_VALIDATE
|
|
* (affects automagic zlp writes).
|
|
*/
|
|
req = list_entry (ep->queue.next,
|
|
struct net2280_request, queue);
|
|
dmacount = req->td->dmacount;
|
|
dmacount &= cpu_to_le32 (
|
|
(1 << VALID_BIT)
|
|
| DMA_BYTE_COUNT_MASK);
|
|
if (dmacount && (dmacount & valid_bit) == 0)
|
|
restart_dma (ep);
|
|
}
|
|
}
|
|
ep->irqs++;
|
|
}
|
|
|
|
/* NOTE: there are other PCI errors we might usefully notice.
|
|
* if they appear very often, here's where to try recovering.
|
|
*/
|
|
if (stat & PCI_ERROR_INTERRUPTS) {
|
|
ERROR (dev, "pci dma error; stat %08x\n", stat);
|
|
stat &= ~PCI_ERROR_INTERRUPTS;
|
|
/* these are fatal errors, but "maybe" they won't
|
|
* happen again ...
|
|
*/
|
|
stop_activity (dev, dev->driver);
|
|
ep0_start (dev);
|
|
stat = 0;
|
|
}
|
|
|
|
if (stat)
|
|
DEBUG (dev, "unhandled irqstat1 %08x\n", stat);
|
|
}
|
|
|
|
static irqreturn_t net2280_irq (int irq, void *_dev)
|
|
{
|
|
struct net2280 *dev = _dev;
|
|
|
|
/* shared interrupt, not ours */
|
|
if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED)))
|
|
return IRQ_NONE;
|
|
|
|
spin_lock (&dev->lock);
|
|
|
|
/* handle disconnect, dma, and more */
|
|
handle_stat1_irqs (dev, readl (&dev->regs->irqstat1));
|
|
|
|
/* control requests and PIO */
|
|
handle_stat0_irqs (dev, readl (&dev->regs->irqstat0));
|
|
|
|
spin_unlock (&dev->lock);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void gadget_release (struct device *_dev)
|
|
{
|
|
struct net2280 *dev = dev_get_drvdata (_dev);
|
|
|
|
kfree (dev);
|
|
}
|
|
|
|
/* tear down the binding between this driver and the pci device */
|
|
|
|
static void net2280_remove (struct pci_dev *pdev)
|
|
{
|
|
struct net2280 *dev = pci_get_drvdata (pdev);
|
|
|
|
usb_del_gadget_udc(&dev->gadget);
|
|
|
|
BUG_ON(dev->driver);
|
|
|
|
/* then clean up the resources we allocated during probe() */
|
|
net2280_led_shutdown (dev);
|
|
if (dev->requests) {
|
|
int i;
|
|
for (i = 1; i < 5; i++) {
|
|
if (!dev->ep [i].dummy)
|
|
continue;
|
|
pci_pool_free (dev->requests, dev->ep [i].dummy,
|
|
dev->ep [i].td_dma);
|
|
}
|
|
pci_pool_destroy (dev->requests);
|
|
}
|
|
if (dev->got_irq)
|
|
free_irq (pdev->irq, dev);
|
|
if (dev->regs)
|
|
iounmap (dev->regs);
|
|
if (dev->region)
|
|
release_mem_region (pci_resource_start (pdev, 0),
|
|
pci_resource_len (pdev, 0));
|
|
if (dev->enabled)
|
|
pci_disable_device (pdev);
|
|
device_unregister (&dev->gadget.dev);
|
|
device_remove_file (&pdev->dev, &dev_attr_registers);
|
|
pci_set_drvdata (pdev, NULL);
|
|
|
|
INFO (dev, "unbind\n");
|
|
}
|
|
|
|
/* wrap this driver around the specified device, but
|
|
* don't respond over USB until a gadget driver binds to us.
|
|
*/
|
|
|
|
static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id)
|
|
{
|
|
struct net2280 *dev;
|
|
unsigned long resource, len;
|
|
void __iomem *base = NULL;
|
|
int retval, i;
|
|
|
|
/* alloc, and start init */
|
|
dev = kzalloc (sizeof *dev, GFP_KERNEL);
|
|
if (dev == NULL){
|
|
retval = -ENOMEM;
|
|
goto done;
|
|
}
|
|
|
|
pci_set_drvdata (pdev, dev);
|
|
spin_lock_init (&dev->lock);
|
|
dev->pdev = pdev;
|
|
dev->gadget.ops = &net2280_ops;
|
|
dev->gadget.is_dualspeed = 1;
|
|
|
|
/* the "gadget" abstracts/virtualizes the controller */
|
|
dev_set_name(&dev->gadget.dev, "gadget");
|
|
dev->gadget.dev.parent = &pdev->dev;
|
|
dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
|
|
dev->gadget.dev.release = gadget_release;
|
|
dev->gadget.name = driver_name;
|
|
|
|
/* now all the pci goodies ... */
|
|
if (pci_enable_device (pdev) < 0) {
|
|
retval = -ENODEV;
|
|
goto done;
|
|
}
|
|
dev->enabled = 1;
|
|
|
|
/* BAR 0 holds all the registers
|
|
* BAR 1 is 8051 memory; unused here (note erratum 0103)
|
|
* BAR 2 is fifo memory; unused here
|
|
*/
|
|
resource = pci_resource_start (pdev, 0);
|
|
len = pci_resource_len (pdev, 0);
|
|
if (!request_mem_region (resource, len, driver_name)) {
|
|
DEBUG (dev, "controller already in use\n");
|
|
retval = -EBUSY;
|
|
goto done;
|
|
}
|
|
dev->region = 1;
|
|
|
|
/* FIXME provide firmware download interface to put
|
|
* 8051 code into the chip, e.g. to turn on PCI PM.
|
|
*/
|
|
|
|
base = ioremap_nocache (resource, len);
|
|
if (base == NULL) {
|
|
DEBUG (dev, "can't map memory\n");
|
|
retval = -EFAULT;
|
|
goto done;
|
|
}
|
|
dev->regs = (struct net2280_regs __iomem *) base;
|
|
dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
|
|
dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
|
|
dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
|
|
dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
|
|
dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
|
|
|
|
/* put into initial config, link up all endpoints */
|
|
writel (0, &dev->usb->usbctl);
|
|
usb_reset (dev);
|
|
usb_reinit (dev);
|
|
|
|
/* irq setup after old hardware is cleaned up */
|
|
if (!pdev->irq) {
|
|
ERROR (dev, "No IRQ. Check PCI setup!\n");
|
|
retval = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev)
|
|
!= 0) {
|
|
ERROR (dev, "request interrupt %d failed\n", pdev->irq);
|
|
retval = -EBUSY;
|
|
goto done;
|
|
}
|
|
dev->got_irq = 1;
|
|
|
|
/* DMA setup */
|
|
/* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
|
|
dev->requests = pci_pool_create ("requests", pdev,
|
|
sizeof (struct net2280_dma),
|
|
0 /* no alignment requirements */,
|
|
0 /* or page-crossing issues */);
|
|
if (!dev->requests) {
|
|
DEBUG (dev, "can't get request pool\n");
|
|
retval = -ENOMEM;
|
|
goto done;
|
|
}
|
|
for (i = 1; i < 5; i++) {
|
|
struct net2280_dma *td;
|
|
|
|
td = pci_pool_alloc (dev->requests, GFP_KERNEL,
|
|
&dev->ep [i].td_dma);
|
|
if (!td) {
|
|
DEBUG (dev, "can't get dummy %d\n", i);
|
|
retval = -ENOMEM;
|
|
goto done;
|
|
}
|
|
td->dmacount = 0; /* not VALID */
|
|
td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
|
|
td->dmadesc = td->dmaaddr;
|
|
dev->ep [i].dummy = td;
|
|
}
|
|
|
|
/* enable lower-overhead pci memory bursts during DMA */
|
|
writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE)
|
|
// 256 write retries may not be enough...
|
|
// | (1 << PCI_RETRY_ABORT_ENABLE)
|
|
| (1 << DMA_READ_MULTIPLE_ENABLE)
|
|
| (1 << DMA_READ_LINE_ENABLE)
|
|
, &dev->pci->pcimstctl);
|
|
/* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
|
|
pci_set_master (pdev);
|
|
pci_try_set_mwi (pdev);
|
|
|
|
/* ... also flushes any posted pci writes */
|
|
dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff;
|
|
|
|
/* done */
|
|
INFO (dev, "%s\n", driver_desc);
|
|
INFO (dev, "irq %d, pci mem %p, chip rev %04x\n",
|
|
pdev->irq, base, dev->chiprev);
|
|
INFO (dev, "version: " DRIVER_VERSION "; dma %s\n",
|
|
use_dma
|
|
? (use_dma_chaining ? "chaining" : "enabled")
|
|
: "disabled");
|
|
retval = device_register (&dev->gadget.dev);
|
|
if (retval) goto done;
|
|
retval = device_create_file (&pdev->dev, &dev_attr_registers);
|
|
if (retval) goto done;
|
|
|
|
retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
|
|
if (retval)
|
|
goto done;
|
|
return 0;
|
|
|
|
done:
|
|
if (dev)
|
|
net2280_remove (pdev);
|
|
return retval;
|
|
}
|
|
|
|
/* make sure the board is quiescent; otherwise it will continue
|
|
* generating IRQs across the upcoming reboot.
|
|
*/
|
|
|
|
static void net2280_shutdown (struct pci_dev *pdev)
|
|
{
|
|
struct net2280 *dev = pci_get_drvdata (pdev);
|
|
|
|
/* disable IRQs */
|
|
writel (0, &dev->regs->pciirqenb0);
|
|
writel (0, &dev->regs->pciirqenb1);
|
|
|
|
/* disable the pullup so the host will think we're gone */
|
|
writel (0, &dev->usb->usbctl);
|
|
}
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static const struct pci_device_id pci_ids [] = { {
|
|
.class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
|
|
.class_mask = ~0,
|
|
.vendor = 0x17cc,
|
|
.device = 0x2280,
|
|
.subvendor = PCI_ANY_ID,
|
|
.subdevice = PCI_ANY_ID,
|
|
}, {
|
|
.class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
|
|
.class_mask = ~0,
|
|
.vendor = 0x17cc,
|
|
.device = 0x2282,
|
|
.subvendor = PCI_ANY_ID,
|
|
.subdevice = PCI_ANY_ID,
|
|
|
|
}, { /* end: all zeroes */ }
|
|
};
|
|
MODULE_DEVICE_TABLE (pci, pci_ids);
|
|
|
|
/* pci driver glue; this is a "new style" PCI driver module */
|
|
static struct pci_driver net2280_pci_driver = {
|
|
.name = (char *) driver_name,
|
|
.id_table = pci_ids,
|
|
|
|
.probe = net2280_probe,
|
|
.remove = net2280_remove,
|
|
.shutdown = net2280_shutdown,
|
|
|
|
/* FIXME add power management support */
|
|
};
|
|
|
|
MODULE_DESCRIPTION (DRIVER_DESC);
|
|
MODULE_AUTHOR ("David Brownell");
|
|
MODULE_LICENSE ("GPL");
|
|
|
|
static int __init init (void)
|
|
{
|
|
if (!use_dma)
|
|
use_dma_chaining = 0;
|
|
return pci_register_driver (&net2280_pci_driver);
|
|
}
|
|
module_init (init);
|
|
|
|
static void __exit cleanup (void)
|
|
{
|
|
pci_unregister_driver (&net2280_pci_driver);
|
|
}
|
|
module_exit (cleanup);
|