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![Eric Miao](/assets/img/avatar_default.png)
Reported-by: Christian Dietrich <qy03fugy@stud.informatik.uni-erlangen.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2678 lines
68 KiB
C
2678 lines
68 KiB
C
/*
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* Handles the Intel 27x USB Device Controller (UDC)
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*
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* Inspired by original driver by Frank Becker, David Brownell, and others.
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* Copyright (C) 2008 Robert Jarzmik
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/proc_fs.h>
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#include <linux/clk.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <asm/byteorder.h>
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#include <mach/hardware.h>
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#include <linux/usb.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <mach/udc.h>
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#include "pxa27x_udc.h"
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/*
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* This driver handles the USB Device Controller (UDC) in Intel's PXA 27x
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* series processors.
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*
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* Such controller drivers work with a gadget driver. The gadget driver
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* returns descriptors, implements configuration and data protocols used
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* by the host to interact with this device, and allocates endpoints to
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* the different protocol interfaces. The controller driver virtualizes
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* usb hardware so that the gadget drivers will be more portable.
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*
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* This UDC hardware wants to implement a bit too much USB protocol. The
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* biggest issues are: that the endpoints have to be set up before the
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* controller can be enabled (minor, and not uncommon); and each endpoint
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* can only have one configuration, interface and alternative interface
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* number (major, and very unusual). Once set up, these cannot be changed
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* without a controller reset.
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*
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* The workaround is to setup all combinations necessary for the gadgets which
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* will work with this driver. This is done in pxa_udc structure, statically.
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* See pxa_udc, udc_usb_ep versus pxa_ep, and matching function find_pxa_ep.
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* (You could modify this if needed. Some drivers have a "fifo_mode" module
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* parameter to facilitate such changes.)
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*
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* The combinations have been tested with these gadgets :
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* - zero gadget
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* - file storage gadget
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* - ether gadget
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*
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* The driver doesn't use DMA, only IO access and IRQ callbacks. No use is
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* made of UDC's double buffering either. USB "On-The-Go" is not implemented.
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*
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* All the requests are handled the same way :
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* - the drivers tries to handle the request directly to the IO
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* - if the IO fifo is not big enough, the remaining is send/received in
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* interrupt handling.
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*/
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#define DRIVER_VERSION "2008-04-18"
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#define DRIVER_DESC "PXA 27x USB Device Controller driver"
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static const char driver_name[] = "pxa27x_udc";
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static struct pxa_udc *the_controller;
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static void handle_ep(struct pxa_ep *ep);
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/*
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* Debug filesystem
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*/
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#ifdef CONFIG_USB_GADGET_DEBUG_FS
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/seq_file.h>
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static int state_dbg_show(struct seq_file *s, void *p)
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{
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struct pxa_udc *udc = s->private;
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int pos = 0, ret;
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u32 tmp;
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ret = -ENODEV;
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if (!udc->driver)
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goto out;
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/* basic device status */
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pos += seq_printf(s, DRIVER_DESC "\n"
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"%s version: %s\nGadget driver: %s\n",
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driver_name, DRIVER_VERSION,
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udc->driver ? udc->driver->driver.name : "(none)");
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tmp = udc_readl(udc, UDCCR);
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pos += seq_printf(s,
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"udccr=0x%0x(%s%s%s%s%s%s%s%s%s%s), "
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"con=%d,inter=%d,altinter=%d\n", tmp,
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(tmp & UDCCR_OEN) ? " oen":"",
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(tmp & UDCCR_AALTHNP) ? " aalthnp":"",
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(tmp & UDCCR_AHNP) ? " rem" : "",
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(tmp & UDCCR_BHNP) ? " rstir" : "",
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(tmp & UDCCR_DWRE) ? " dwre" : "",
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(tmp & UDCCR_SMAC) ? " smac" : "",
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(tmp & UDCCR_EMCE) ? " emce" : "",
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(tmp & UDCCR_UDR) ? " udr" : "",
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(tmp & UDCCR_UDA) ? " uda" : "",
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(tmp & UDCCR_UDE) ? " ude" : "",
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(tmp & UDCCR_ACN) >> UDCCR_ACN_S,
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(tmp & UDCCR_AIN) >> UDCCR_AIN_S,
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(tmp & UDCCR_AAISN) >> UDCCR_AAISN_S);
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/* registers for device and ep0 */
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pos += seq_printf(s, "udcicr0=0x%08x udcicr1=0x%08x\n",
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udc_readl(udc, UDCICR0), udc_readl(udc, UDCICR1));
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pos += seq_printf(s, "udcisr0=0x%08x udcisr1=0x%08x\n",
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udc_readl(udc, UDCISR0), udc_readl(udc, UDCISR1));
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pos += seq_printf(s, "udcfnr=%d\n", udc_readl(udc, UDCFNR));
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pos += seq_printf(s, "irqs: reset=%lu, suspend=%lu, resume=%lu, "
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"reconfig=%lu\n",
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udc->stats.irqs_reset, udc->stats.irqs_suspend,
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udc->stats.irqs_resume, udc->stats.irqs_reconfig);
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ret = 0;
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out:
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return ret;
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}
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static int queues_dbg_show(struct seq_file *s, void *p)
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{
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struct pxa_udc *udc = s->private;
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struct pxa_ep *ep;
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struct pxa27x_request *req;
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int pos = 0, i, maxpkt, ret;
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ret = -ENODEV;
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if (!udc->driver)
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goto out;
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/* dump endpoint queues */
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for (i = 0; i < NR_PXA_ENDPOINTS; i++) {
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ep = &udc->pxa_ep[i];
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maxpkt = ep->fifo_size;
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pos += seq_printf(s, "%-12s max_pkt=%d %s\n",
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EPNAME(ep), maxpkt, "pio");
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if (list_empty(&ep->queue)) {
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pos += seq_printf(s, "\t(nothing queued)\n");
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continue;
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}
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list_for_each_entry(req, &ep->queue, queue) {
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pos += seq_printf(s, "\treq %p len %d/%d buf %p\n",
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&req->req, req->req.actual,
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req->req.length, req->req.buf);
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}
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}
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ret = 0;
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out:
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return ret;
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}
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static int eps_dbg_show(struct seq_file *s, void *p)
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{
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struct pxa_udc *udc = s->private;
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struct pxa_ep *ep;
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int pos = 0, i, ret;
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u32 tmp;
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ret = -ENODEV;
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if (!udc->driver)
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goto out;
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ep = &udc->pxa_ep[0];
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tmp = udc_ep_readl(ep, UDCCSR);
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pos += seq_printf(s, "udccsr0=0x%03x(%s%s%s%s%s%s%s)\n", tmp,
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(tmp & UDCCSR0_SA) ? " sa" : "",
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(tmp & UDCCSR0_RNE) ? " rne" : "",
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(tmp & UDCCSR0_FST) ? " fst" : "",
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(tmp & UDCCSR0_SST) ? " sst" : "",
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(tmp & UDCCSR0_DME) ? " dme" : "",
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(tmp & UDCCSR0_IPR) ? " ipr" : "",
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(tmp & UDCCSR0_OPC) ? " opc" : "");
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for (i = 0; i < NR_PXA_ENDPOINTS; i++) {
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ep = &udc->pxa_ep[i];
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tmp = i? udc_ep_readl(ep, UDCCR) : udc_readl(udc, UDCCR);
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pos += seq_printf(s, "%-12s: "
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"IN %lu(%lu reqs), OUT %lu(%lu reqs), "
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"irqs=%lu, udccr=0x%08x, udccsr=0x%03x, "
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"udcbcr=%d\n",
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EPNAME(ep),
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ep->stats.in_bytes, ep->stats.in_ops,
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ep->stats.out_bytes, ep->stats.out_ops,
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ep->stats.irqs,
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tmp, udc_ep_readl(ep, UDCCSR),
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udc_ep_readl(ep, UDCBCR));
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}
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ret = 0;
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out:
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return ret;
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}
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static int eps_dbg_open(struct inode *inode, struct file *file)
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{
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return single_open(file, eps_dbg_show, inode->i_private);
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}
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static int queues_dbg_open(struct inode *inode, struct file *file)
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{
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return single_open(file, queues_dbg_show, inode->i_private);
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}
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static int state_dbg_open(struct inode *inode, struct file *file)
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{
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return single_open(file, state_dbg_show, inode->i_private);
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}
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static const struct file_operations state_dbg_fops = {
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.owner = THIS_MODULE,
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.open = state_dbg_open,
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.llseek = seq_lseek,
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.read = seq_read,
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.release = single_release,
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};
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static const struct file_operations queues_dbg_fops = {
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.owner = THIS_MODULE,
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.open = queues_dbg_open,
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.llseek = seq_lseek,
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.read = seq_read,
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.release = single_release,
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};
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static const struct file_operations eps_dbg_fops = {
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.owner = THIS_MODULE,
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.open = eps_dbg_open,
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.llseek = seq_lseek,
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.read = seq_read,
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.release = single_release,
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};
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static void pxa_init_debugfs(struct pxa_udc *udc)
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{
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struct dentry *root, *state, *queues, *eps;
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root = debugfs_create_dir(udc->gadget.name, NULL);
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if (IS_ERR(root) || !root)
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goto err_root;
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state = debugfs_create_file("udcstate", 0400, root, udc,
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&state_dbg_fops);
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if (!state)
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goto err_state;
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queues = debugfs_create_file("queues", 0400, root, udc,
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&queues_dbg_fops);
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if (!queues)
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goto err_queues;
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eps = debugfs_create_file("epstate", 0400, root, udc,
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&eps_dbg_fops);
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if (!eps)
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goto err_eps;
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udc->debugfs_root = root;
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udc->debugfs_state = state;
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udc->debugfs_queues = queues;
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udc->debugfs_eps = eps;
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return;
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err_eps:
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debugfs_remove(eps);
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err_queues:
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debugfs_remove(queues);
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err_state:
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debugfs_remove(root);
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err_root:
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dev_err(udc->dev, "debugfs is not available\n");
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}
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static void pxa_cleanup_debugfs(struct pxa_udc *udc)
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{
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debugfs_remove(udc->debugfs_eps);
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debugfs_remove(udc->debugfs_queues);
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debugfs_remove(udc->debugfs_state);
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debugfs_remove(udc->debugfs_root);
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udc->debugfs_eps = NULL;
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udc->debugfs_queues = NULL;
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udc->debugfs_state = NULL;
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udc->debugfs_root = NULL;
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}
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#else
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static inline void pxa_init_debugfs(struct pxa_udc *udc)
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{
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}
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static inline void pxa_cleanup_debugfs(struct pxa_udc *udc)
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{
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}
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#endif
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/**
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* is_match_usb_pxa - check if usb_ep and pxa_ep match
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* @udc_usb_ep: usb endpoint
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* @ep: pxa endpoint
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* @config: configuration required in pxa_ep
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* @interface: interface required in pxa_ep
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* @altsetting: altsetting required in pxa_ep
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*
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* Returns 1 if all criteria match between pxa and usb endpoint, 0 otherwise
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*/
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static int is_match_usb_pxa(struct udc_usb_ep *udc_usb_ep, struct pxa_ep *ep,
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int config, int interface, int altsetting)
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{
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if (usb_endpoint_num(&udc_usb_ep->desc) != ep->addr)
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return 0;
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if (usb_endpoint_dir_in(&udc_usb_ep->desc) != ep->dir_in)
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return 0;
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if (usb_endpoint_type(&udc_usb_ep->desc) != ep->type)
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return 0;
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if ((ep->config != config) || (ep->interface != interface)
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|| (ep->alternate != altsetting))
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return 0;
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return 1;
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}
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/**
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* find_pxa_ep - find pxa_ep structure matching udc_usb_ep
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* @udc: pxa udc
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* @udc_usb_ep: udc_usb_ep structure
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*
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* Match udc_usb_ep and all pxa_ep available, to see if one matches.
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* This is necessary because of the strong pxa hardware restriction requiring
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* that once pxa endpoints are initialized, their configuration is freezed, and
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* no change can be made to their address, direction, or in which configuration,
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* interface or altsetting they are active ... which differs from more usual
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* models which have endpoints be roughly just addressable fifos, and leave
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* configuration events up to gadget drivers (like all control messages).
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*
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* Note that there is still a blurred point here :
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* - we rely on UDCCR register "active interface" and "active altsetting".
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* This is a nonsense in regard of USB spec, where multiple interfaces are
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* active at the same time.
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* - if we knew for sure that the pxa can handle multiple interface at the
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* same time, assuming Intel's Developer Guide is wrong, this function
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* should be reviewed, and a cache of couples (iface, altsetting) should
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* be kept in the pxa_udc structure. In this case this function would match
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* against the cache of couples instead of the "last altsetting" set up.
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*
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* Returns the matched pxa_ep structure or NULL if none found
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*/
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static struct pxa_ep *find_pxa_ep(struct pxa_udc *udc,
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struct udc_usb_ep *udc_usb_ep)
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{
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int i;
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struct pxa_ep *ep;
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int cfg = udc->config;
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int iface = udc->last_interface;
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int alt = udc->last_alternate;
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|
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if (udc_usb_ep == &udc->udc_usb_ep[0])
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return &udc->pxa_ep[0];
|
|
|
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for (i = 1; i < NR_PXA_ENDPOINTS; i++) {
|
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ep = &udc->pxa_ep[i];
|
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if (is_match_usb_pxa(udc_usb_ep, ep, cfg, iface, alt))
|
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return ep;
|
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}
|
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return NULL;
|
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}
|
|
|
|
/**
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* update_pxa_ep_matches - update pxa_ep cached values in all udc_usb_ep
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* @udc: pxa udc
|
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*
|
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* Context: in_interrupt()
|
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*
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* Updates all pxa_ep fields in udc_usb_ep structures, if this field was
|
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* previously set up (and is not NULL). The update is necessary is a
|
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* configuration change or altsetting change was issued by the USB host.
|
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*/
|
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static void update_pxa_ep_matches(struct pxa_udc *udc)
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{
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int i;
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struct udc_usb_ep *udc_usb_ep;
|
|
|
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for (i = 1; i < NR_USB_ENDPOINTS; i++) {
|
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udc_usb_ep = &udc->udc_usb_ep[i];
|
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if (udc_usb_ep->pxa_ep)
|
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udc_usb_ep->pxa_ep = find_pxa_ep(udc, udc_usb_ep);
|
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}
|
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}
|
|
|
|
/**
|
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* pio_irq_enable - Enables irq generation for one endpoint
|
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* @ep: udc endpoint
|
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*/
|
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static void pio_irq_enable(struct pxa_ep *ep)
|
|
{
|
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struct pxa_udc *udc = ep->dev;
|
|
int index = EPIDX(ep);
|
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u32 udcicr0 = udc_readl(udc, UDCICR0);
|
|
u32 udcicr1 = udc_readl(udc, UDCICR1);
|
|
|
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if (index < 16)
|
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udc_writel(udc, UDCICR0, udcicr0 | (3 << (index * 2)));
|
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else
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udc_writel(udc, UDCICR1, udcicr1 | (3 << ((index - 16) * 2)));
|
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}
|
|
|
|
/**
|
|
* pio_irq_disable - Disables irq generation for one endpoint
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* @ep: udc endpoint
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*/
|
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static void pio_irq_disable(struct pxa_ep *ep)
|
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{
|
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struct pxa_udc *udc = ep->dev;
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int index = EPIDX(ep);
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u32 udcicr0 = udc_readl(udc, UDCICR0);
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u32 udcicr1 = udc_readl(udc, UDCICR1);
|
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|
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if (index < 16)
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udc_writel(udc, UDCICR0, udcicr0 & ~(3 << (index * 2)));
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else
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udc_writel(udc, UDCICR1, udcicr1 & ~(3 << ((index - 16) * 2)));
|
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}
|
|
|
|
/**
|
|
* udc_set_mask_UDCCR - set bits in UDCCR
|
|
* @udc: udc device
|
|
* @mask: bits to set in UDCCR
|
|
*
|
|
* Sets bits in UDCCR, leaving DME and FST bits as they were.
|
|
*/
|
|
static inline void udc_set_mask_UDCCR(struct pxa_udc *udc, int mask)
|
|
{
|
|
u32 udccr = udc_readl(udc, UDCCR);
|
|
udc_writel(udc, UDCCR,
|
|
(udccr & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS));
|
|
}
|
|
|
|
/**
|
|
* udc_clear_mask_UDCCR - clears bits in UDCCR
|
|
* @udc: udc device
|
|
* @mask: bit to clear in UDCCR
|
|
*
|
|
* Clears bits in UDCCR, leaving DME and FST bits as they were.
|
|
*/
|
|
static inline void udc_clear_mask_UDCCR(struct pxa_udc *udc, int mask)
|
|
{
|
|
u32 udccr = udc_readl(udc, UDCCR);
|
|
udc_writel(udc, UDCCR,
|
|
(udccr & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS));
|
|
}
|
|
|
|
/**
|
|
* ep_write_UDCCSR - set bits in UDCCSR
|
|
* @udc: udc device
|
|
* @mask: bits to set in UDCCR
|
|
*
|
|
* Sets bits in UDCCSR (UDCCSR0 and UDCCSR*).
|
|
*
|
|
* A specific case is applied to ep0 : the ACM bit is always set to 1, for
|
|
* SET_INTERFACE and SET_CONFIGURATION.
|
|
*/
|
|
static inline void ep_write_UDCCSR(struct pxa_ep *ep, int mask)
|
|
{
|
|
if (is_ep0(ep))
|
|
mask |= UDCCSR0_ACM;
|
|
udc_ep_writel(ep, UDCCSR, mask);
|
|
}
|
|
|
|
/**
|
|
* ep_count_bytes_remain - get how many bytes in udc endpoint
|
|
* @ep: udc endpoint
|
|
*
|
|
* Returns number of bytes in OUT fifos. Broken for IN fifos (-EOPNOTSUPP)
|
|
*/
|
|
static int ep_count_bytes_remain(struct pxa_ep *ep)
|
|
{
|
|
if (ep->dir_in)
|
|
return -EOPNOTSUPP;
|
|
return udc_ep_readl(ep, UDCBCR) & 0x3ff;
|
|
}
|
|
|
|
/**
|
|
* ep_is_empty - checks if ep has byte ready for reading
|
|
* @ep: udc endpoint
|
|
*
|
|
* If endpoint is the control endpoint, checks if there are bytes in the
|
|
* control endpoint fifo. If endpoint is a data endpoint, checks if bytes
|
|
* are ready for reading on OUT endpoint.
|
|
*
|
|
* Returns 0 if ep not empty, 1 if ep empty, -EOPNOTSUPP if IN endpoint
|
|
*/
|
|
static int ep_is_empty(struct pxa_ep *ep)
|
|
{
|
|
int ret;
|
|
|
|
if (!is_ep0(ep) && ep->dir_in)
|
|
return -EOPNOTSUPP;
|
|
if (is_ep0(ep))
|
|
ret = !(udc_ep_readl(ep, UDCCSR) & UDCCSR0_RNE);
|
|
else
|
|
ret = !(udc_ep_readl(ep, UDCCSR) & UDCCSR_BNE);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ep_is_full - checks if ep has place to write bytes
|
|
* @ep: udc endpoint
|
|
*
|
|
* If endpoint is not the control endpoint and is an IN endpoint, checks if
|
|
* there is place to write bytes into the endpoint.
|
|
*
|
|
* Returns 0 if ep not full, 1 if ep full, -EOPNOTSUPP if OUT endpoint
|
|
*/
|
|
static int ep_is_full(struct pxa_ep *ep)
|
|
{
|
|
if (is_ep0(ep))
|
|
return (udc_ep_readl(ep, UDCCSR) & UDCCSR0_IPR);
|
|
if (!ep->dir_in)
|
|
return -EOPNOTSUPP;
|
|
return (!(udc_ep_readl(ep, UDCCSR) & UDCCSR_BNF));
|
|
}
|
|
|
|
/**
|
|
* epout_has_pkt - checks if OUT endpoint fifo has a packet available
|
|
* @ep: pxa endpoint
|
|
*
|
|
* Returns 1 if a complete packet is available, 0 if not, -EOPNOTSUPP for IN ep.
|
|
*/
|
|
static int epout_has_pkt(struct pxa_ep *ep)
|
|
{
|
|
if (!is_ep0(ep) && ep->dir_in)
|
|
return -EOPNOTSUPP;
|
|
if (is_ep0(ep))
|
|
return (udc_ep_readl(ep, UDCCSR) & UDCCSR0_OPC);
|
|
return (udc_ep_readl(ep, UDCCSR) & UDCCSR_PC);
|
|
}
|
|
|
|
/**
|
|
* set_ep0state - Set ep0 automata state
|
|
* @dev: udc device
|
|
* @state: state
|
|
*/
|
|
static void set_ep0state(struct pxa_udc *udc, int state)
|
|
{
|
|
struct pxa_ep *ep = &udc->pxa_ep[0];
|
|
char *old_stname = EP0_STNAME(udc);
|
|
|
|
udc->ep0state = state;
|
|
ep_dbg(ep, "state=%s->%s, udccsr0=0x%03x, udcbcr=%d\n", old_stname,
|
|
EP0_STNAME(udc), udc_ep_readl(ep, UDCCSR),
|
|
udc_ep_readl(ep, UDCBCR));
|
|
}
|
|
|
|
/**
|
|
* ep0_idle - Put control endpoint into idle state
|
|
* @dev: udc device
|
|
*/
|
|
static void ep0_idle(struct pxa_udc *dev)
|
|
{
|
|
set_ep0state(dev, WAIT_FOR_SETUP);
|
|
}
|
|
|
|
/**
|
|
* inc_ep_stats_reqs - Update ep stats counts
|
|
* @ep: physical endpoint
|
|
* @req: usb request
|
|
* @is_in: ep direction (USB_DIR_IN or 0)
|
|
*
|
|
*/
|
|
static void inc_ep_stats_reqs(struct pxa_ep *ep, int is_in)
|
|
{
|
|
if (is_in)
|
|
ep->stats.in_ops++;
|
|
else
|
|
ep->stats.out_ops++;
|
|
}
|
|
|
|
/**
|
|
* inc_ep_stats_bytes - Update ep stats counts
|
|
* @ep: physical endpoint
|
|
* @count: bytes transfered on endpoint
|
|
* @is_in: ep direction (USB_DIR_IN or 0)
|
|
*/
|
|
static void inc_ep_stats_bytes(struct pxa_ep *ep, int count, int is_in)
|
|
{
|
|
if (is_in)
|
|
ep->stats.in_bytes += count;
|
|
else
|
|
ep->stats.out_bytes += count;
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_setup - Sets up an usb physical endpoint
|
|
* @ep: pxa27x physical endpoint
|
|
*
|
|
* Find the physical pxa27x ep, and setup its UDCCR
|
|
*/
|
|
static __init void pxa_ep_setup(struct pxa_ep *ep)
|
|
{
|
|
u32 new_udccr;
|
|
|
|
new_udccr = ((ep->config << UDCCONR_CN_S) & UDCCONR_CN)
|
|
| ((ep->interface << UDCCONR_IN_S) & UDCCONR_IN)
|
|
| ((ep->alternate << UDCCONR_AISN_S) & UDCCONR_AISN)
|
|
| ((EPADDR(ep) << UDCCONR_EN_S) & UDCCONR_EN)
|
|
| ((EPXFERTYPE(ep) << UDCCONR_ET_S) & UDCCONR_ET)
|
|
| ((ep->dir_in) ? UDCCONR_ED : 0)
|
|
| ((ep->fifo_size << UDCCONR_MPS_S) & UDCCONR_MPS)
|
|
| UDCCONR_EE;
|
|
|
|
udc_ep_writel(ep, UDCCR, new_udccr);
|
|
}
|
|
|
|
/**
|
|
* pxa_eps_setup - Sets up all usb physical endpoints
|
|
* @dev: udc device
|
|
*
|
|
* Setup all pxa physical endpoints, except ep0
|
|
*/
|
|
static __init void pxa_eps_setup(struct pxa_udc *dev)
|
|
{
|
|
unsigned int i;
|
|
|
|
dev_dbg(dev->dev, "%s: dev=%p\n", __func__, dev);
|
|
|
|
for (i = 1; i < NR_PXA_ENDPOINTS; i++)
|
|
pxa_ep_setup(&dev->pxa_ep[i]);
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_alloc_request - Allocate usb request
|
|
* @_ep: usb endpoint
|
|
* @gfp_flags:
|
|
*
|
|
* For the pxa27x, these can just wrap kmalloc/kfree. gadget drivers
|
|
* must still pass correctly initialized endpoints, since other controller
|
|
* drivers may care about how it's currently set up (dma issues etc).
|
|
*/
|
|
static struct usb_request *
|
|
pxa_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
|
|
{
|
|
struct pxa27x_request *req;
|
|
|
|
req = kzalloc(sizeof *req, gfp_flags);
|
|
if (!req)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&req->queue);
|
|
req->in_use = 0;
|
|
req->udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
|
|
|
|
return &req->req;
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_free_request - Free usb request
|
|
* @_ep: usb endpoint
|
|
* @_req: usb request
|
|
*
|
|
* Wrapper around kfree to free _req
|
|
*/
|
|
static void pxa_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
|
|
{
|
|
struct pxa27x_request *req;
|
|
|
|
req = container_of(_req, struct pxa27x_request, req);
|
|
WARN_ON(!list_empty(&req->queue));
|
|
kfree(req);
|
|
}
|
|
|
|
/**
|
|
* ep_add_request - add a request to the endpoint's queue
|
|
* @ep: usb endpoint
|
|
* @req: usb request
|
|
*
|
|
* Context: ep->lock held
|
|
*
|
|
* Queues the request in the endpoint's queue, and enables the interrupts
|
|
* on the endpoint.
|
|
*/
|
|
static void ep_add_request(struct pxa_ep *ep, struct pxa27x_request *req)
|
|
{
|
|
if (unlikely(!req))
|
|
return;
|
|
ep_vdbg(ep, "req:%p, lg=%d, udccsr=0x%03x\n", req,
|
|
req->req.length, udc_ep_readl(ep, UDCCSR));
|
|
|
|
req->in_use = 1;
|
|
list_add_tail(&req->queue, &ep->queue);
|
|
pio_irq_enable(ep);
|
|
}
|
|
|
|
/**
|
|
* ep_del_request - removes a request from the endpoint's queue
|
|
* @ep: usb endpoint
|
|
* @req: usb request
|
|
*
|
|
* Context: ep->lock held
|
|
*
|
|
* Unqueue the request from the endpoint's queue. If there are no more requests
|
|
* on the endpoint, and if it's not the control endpoint, interrupts are
|
|
* disabled on the endpoint.
|
|
*/
|
|
static void ep_del_request(struct pxa_ep *ep, struct pxa27x_request *req)
|
|
{
|
|
if (unlikely(!req))
|
|
return;
|
|
ep_vdbg(ep, "req:%p, lg=%d, udccsr=0x%03x\n", req,
|
|
req->req.length, udc_ep_readl(ep, UDCCSR));
|
|
|
|
list_del_init(&req->queue);
|
|
req->in_use = 0;
|
|
if (!is_ep0(ep) && list_empty(&ep->queue))
|
|
pio_irq_disable(ep);
|
|
}
|
|
|
|
/**
|
|
* req_done - Complete an usb request
|
|
* @ep: pxa physical endpoint
|
|
* @req: pxa request
|
|
* @status: usb request status sent to gadget API
|
|
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
|
|
*
|
|
* Context: ep->lock held if flags not NULL, else ep->lock released
|
|
*
|
|
* Retire a pxa27x usb request. Endpoint must be locked.
|
|
*/
|
|
static void req_done(struct pxa_ep *ep, struct pxa27x_request *req, int status,
|
|
unsigned long *pflags)
|
|
{
|
|
unsigned long flags;
|
|
|
|
ep_del_request(ep, req);
|
|
if (likely(req->req.status == -EINPROGRESS))
|
|
req->req.status = status;
|
|
else
|
|
status = req->req.status;
|
|
|
|
if (status && status != -ESHUTDOWN)
|
|
ep_dbg(ep, "complete req %p stat %d len %u/%u\n",
|
|
&req->req, status,
|
|
req->req.actual, req->req.length);
|
|
|
|
if (pflags)
|
|
spin_unlock_irqrestore(&ep->lock, *pflags);
|
|
local_irq_save(flags);
|
|
req->req.complete(&req->udc_usb_ep->usb_ep, &req->req);
|
|
local_irq_restore(flags);
|
|
if (pflags)
|
|
spin_lock_irqsave(&ep->lock, *pflags);
|
|
}
|
|
|
|
/**
|
|
* ep_end_out_req - Ends endpoint OUT request
|
|
* @ep: physical endpoint
|
|
* @req: pxa request
|
|
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
|
|
*
|
|
* Context: ep->lock held or released (see req_done())
|
|
*
|
|
* Ends endpoint OUT request (completes usb request).
|
|
*/
|
|
static void ep_end_out_req(struct pxa_ep *ep, struct pxa27x_request *req,
|
|
unsigned long *pflags)
|
|
{
|
|
inc_ep_stats_reqs(ep, !USB_DIR_IN);
|
|
req_done(ep, req, 0, pflags);
|
|
}
|
|
|
|
/**
|
|
* ep0_end_out_req - Ends control endpoint OUT request (ends data stage)
|
|
* @ep: physical endpoint
|
|
* @req: pxa request
|
|
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
|
|
*
|
|
* Context: ep->lock held or released (see req_done())
|
|
*
|
|
* Ends control endpoint OUT request (completes usb request), and puts
|
|
* control endpoint into idle state
|
|
*/
|
|
static void ep0_end_out_req(struct pxa_ep *ep, struct pxa27x_request *req,
|
|
unsigned long *pflags)
|
|
{
|
|
set_ep0state(ep->dev, OUT_STATUS_STAGE);
|
|
ep_end_out_req(ep, req, pflags);
|
|
ep0_idle(ep->dev);
|
|
}
|
|
|
|
/**
|
|
* ep_end_in_req - Ends endpoint IN request
|
|
* @ep: physical endpoint
|
|
* @req: pxa request
|
|
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
|
|
*
|
|
* Context: ep->lock held or released (see req_done())
|
|
*
|
|
* Ends endpoint IN request (completes usb request).
|
|
*/
|
|
static void ep_end_in_req(struct pxa_ep *ep, struct pxa27x_request *req,
|
|
unsigned long *pflags)
|
|
{
|
|
inc_ep_stats_reqs(ep, USB_DIR_IN);
|
|
req_done(ep, req, 0, pflags);
|
|
}
|
|
|
|
/**
|
|
* ep0_end_in_req - Ends control endpoint IN request (ends data stage)
|
|
* @ep: physical endpoint
|
|
* @req: pxa request
|
|
* @pflags: flags of previous spinlock_irq_save() or NULL if no lock held
|
|
*
|
|
* Context: ep->lock held or released (see req_done())
|
|
*
|
|
* Ends control endpoint IN request (completes usb request), and puts
|
|
* control endpoint into status state
|
|
*/
|
|
static void ep0_end_in_req(struct pxa_ep *ep, struct pxa27x_request *req,
|
|
unsigned long *pflags)
|
|
{
|
|
set_ep0state(ep->dev, IN_STATUS_STAGE);
|
|
ep_end_in_req(ep, req, pflags);
|
|
}
|
|
|
|
/**
|
|
* nuke - Dequeue all requests
|
|
* @ep: pxa endpoint
|
|
* @status: usb request status
|
|
*
|
|
* Context: ep->lock released
|
|
*
|
|
* Dequeues all requests on an endpoint. As a side effect, interrupts will be
|
|
* disabled on that endpoint (because no more requests).
|
|
*/
|
|
static void nuke(struct pxa_ep *ep, int status)
|
|
{
|
|
struct pxa27x_request *req;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ep->lock, flags);
|
|
while (!list_empty(&ep->queue)) {
|
|
req = list_entry(ep->queue.next, struct pxa27x_request, queue);
|
|
req_done(ep, req, status, &flags);
|
|
}
|
|
spin_unlock_irqrestore(&ep->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* read_packet - transfer 1 packet from an OUT endpoint into request
|
|
* @ep: pxa physical endpoint
|
|
* @req: usb request
|
|
*
|
|
* Takes bytes from OUT endpoint and transfers them info the usb request.
|
|
* If there is less space in request than bytes received in OUT endpoint,
|
|
* bytes are left in the OUT endpoint.
|
|
*
|
|
* Returns how many bytes were actually transfered
|
|
*/
|
|
static int read_packet(struct pxa_ep *ep, struct pxa27x_request *req)
|
|
{
|
|
u32 *buf;
|
|
int bytes_ep, bufferspace, count, i;
|
|
|
|
bytes_ep = ep_count_bytes_remain(ep);
|
|
bufferspace = req->req.length - req->req.actual;
|
|
|
|
buf = (u32 *)(req->req.buf + req->req.actual);
|
|
prefetchw(buf);
|
|
|
|
if (likely(!ep_is_empty(ep)))
|
|
count = min(bytes_ep, bufferspace);
|
|
else /* zlp */
|
|
count = 0;
|
|
|
|
for (i = count; i > 0; i -= 4)
|
|
*buf++ = udc_ep_readl(ep, UDCDR);
|
|
req->req.actual += count;
|
|
|
|
ep_write_UDCCSR(ep, UDCCSR_PC);
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* write_packet - transfer 1 packet from request into an IN endpoint
|
|
* @ep: pxa physical endpoint
|
|
* @req: usb request
|
|
* @max: max bytes that fit into endpoint
|
|
*
|
|
* Takes bytes from usb request, and transfers them into the physical
|
|
* endpoint. If there are no bytes to transfer, doesn't write anything
|
|
* to physical endpoint.
|
|
*
|
|
* Returns how many bytes were actually transfered.
|
|
*/
|
|
static int write_packet(struct pxa_ep *ep, struct pxa27x_request *req,
|
|
unsigned int max)
|
|
{
|
|
int length, count, remain, i;
|
|
u32 *buf;
|
|
u8 *buf_8;
|
|
|
|
buf = (u32 *)(req->req.buf + req->req.actual);
|
|
prefetch(buf);
|
|
|
|
length = min(req->req.length - req->req.actual, max);
|
|
req->req.actual += length;
|
|
|
|
remain = length & 0x3;
|
|
count = length & ~(0x3);
|
|
for (i = count; i > 0 ; i -= 4)
|
|
udc_ep_writel(ep, UDCDR, *buf++);
|
|
|
|
buf_8 = (u8 *)buf;
|
|
for (i = remain; i > 0; i--)
|
|
udc_ep_writeb(ep, UDCDR, *buf_8++);
|
|
|
|
ep_vdbg(ep, "length=%d+%d, udccsr=0x%03x\n", count, remain,
|
|
udc_ep_readl(ep, UDCCSR));
|
|
|
|
return length;
|
|
}
|
|
|
|
/**
|
|
* read_fifo - Transfer packets from OUT endpoint into usb request
|
|
* @ep: pxa physical endpoint
|
|
* @req: usb request
|
|
*
|
|
* Context: callable when in_interrupt()
|
|
*
|
|
* Unload as many packets as possible from the fifo we use for usb OUT
|
|
* transfers and put them into the request. Caller should have made sure
|
|
* there's at least one packet ready.
|
|
* Doesn't complete the request, that's the caller's job
|
|
*
|
|
* Returns 1 if the request completed, 0 otherwise
|
|
*/
|
|
static int read_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
|
|
{
|
|
int count, is_short, completed = 0;
|
|
|
|
while (epout_has_pkt(ep)) {
|
|
count = read_packet(ep, req);
|
|
inc_ep_stats_bytes(ep, count, !USB_DIR_IN);
|
|
|
|
is_short = (count < ep->fifo_size);
|
|
ep_dbg(ep, "read udccsr:%03x, count:%d bytes%s req %p %d/%d\n",
|
|
udc_ep_readl(ep, UDCCSR), count, is_short ? "/S" : "",
|
|
&req->req, req->req.actual, req->req.length);
|
|
|
|
/* completion */
|
|
if (is_short || req->req.actual == req->req.length) {
|
|
completed = 1;
|
|
break;
|
|
}
|
|
/* finished that packet. the next one may be waiting... */
|
|
}
|
|
return completed;
|
|
}
|
|
|
|
/**
|
|
* write_fifo - transfer packets from usb request into an IN endpoint
|
|
* @ep: pxa physical endpoint
|
|
* @req: pxa usb request
|
|
*
|
|
* Write to an IN endpoint fifo, as many packets as possible.
|
|
* irqs will use this to write the rest later.
|
|
* caller guarantees at least one packet buffer is ready (or a zlp).
|
|
* Doesn't complete the request, that's the caller's job
|
|
*
|
|
* Returns 1 if request fully transfered, 0 if partial transfer
|
|
*/
|
|
static int write_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
|
|
{
|
|
unsigned max;
|
|
int count, is_short, is_last = 0, completed = 0, totcount = 0;
|
|
u32 udccsr;
|
|
|
|
max = ep->fifo_size;
|
|
do {
|
|
is_short = 0;
|
|
|
|
udccsr = udc_ep_readl(ep, UDCCSR);
|
|
if (udccsr & UDCCSR_PC) {
|
|
ep_vdbg(ep, "Clearing Transmit Complete, udccsr=%x\n",
|
|
udccsr);
|
|
ep_write_UDCCSR(ep, UDCCSR_PC);
|
|
}
|
|
if (udccsr & UDCCSR_TRN) {
|
|
ep_vdbg(ep, "Clearing Underrun on, udccsr=%x\n",
|
|
udccsr);
|
|
ep_write_UDCCSR(ep, UDCCSR_TRN);
|
|
}
|
|
|
|
count = write_packet(ep, req, max);
|
|
inc_ep_stats_bytes(ep, count, USB_DIR_IN);
|
|
totcount += count;
|
|
|
|
/* last packet is usually short (or a zlp) */
|
|
if (unlikely(count < max)) {
|
|
is_last = 1;
|
|
is_short = 1;
|
|
} else {
|
|
if (likely(req->req.length > req->req.actual)
|
|
|| req->req.zero)
|
|
is_last = 0;
|
|
else
|
|
is_last = 1;
|
|
/* interrupt/iso maxpacket may not fill the fifo */
|
|
is_short = unlikely(max < ep->fifo_size);
|
|
}
|
|
|
|
if (is_short)
|
|
ep_write_UDCCSR(ep, UDCCSR_SP);
|
|
|
|
/* requests complete when all IN data is in the FIFO */
|
|
if (is_last) {
|
|
completed = 1;
|
|
break;
|
|
}
|
|
} while (!ep_is_full(ep));
|
|
|
|
ep_dbg(ep, "wrote count:%d bytes%s%s, left:%d req=%p\n",
|
|
totcount, is_last ? "/L" : "", is_short ? "/S" : "",
|
|
req->req.length - req->req.actual, &req->req);
|
|
|
|
return completed;
|
|
}
|
|
|
|
/**
|
|
* read_ep0_fifo - Transfer packets from control endpoint into usb request
|
|
* @ep: control endpoint
|
|
* @req: pxa usb request
|
|
*
|
|
* Special ep0 version of the above read_fifo. Reads as many bytes from control
|
|
* endpoint as can be read, and stores them into usb request (limited by request
|
|
* maximum length).
|
|
*
|
|
* Returns 0 if usb request only partially filled, 1 if fully filled
|
|
*/
|
|
static int read_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
|
|
{
|
|
int count, is_short, completed = 0;
|
|
|
|
while (epout_has_pkt(ep)) {
|
|
count = read_packet(ep, req);
|
|
ep_write_UDCCSR(ep, UDCCSR0_OPC);
|
|
inc_ep_stats_bytes(ep, count, !USB_DIR_IN);
|
|
|
|
is_short = (count < ep->fifo_size);
|
|
ep_dbg(ep, "read udccsr:%03x, count:%d bytes%s req %p %d/%d\n",
|
|
udc_ep_readl(ep, UDCCSR), count, is_short ? "/S" : "",
|
|
&req->req, req->req.actual, req->req.length);
|
|
|
|
if (is_short || req->req.actual >= req->req.length) {
|
|
completed = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return completed;
|
|
}
|
|
|
|
/**
|
|
* write_ep0_fifo - Send a request to control endpoint (ep0 in)
|
|
* @ep: control endpoint
|
|
* @req: request
|
|
*
|
|
* Context: callable when in_interrupt()
|
|
*
|
|
* Sends a request (or a part of the request) to the control endpoint (ep0 in).
|
|
* If the request doesn't fit, the remaining part will be sent from irq.
|
|
* The request is considered fully written only if either :
|
|
* - last write transfered all remaining bytes, but fifo was not fully filled
|
|
* - last write was a 0 length write
|
|
*
|
|
* Returns 1 if request fully written, 0 if request only partially sent
|
|
*/
|
|
static int write_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
|
|
{
|
|
unsigned count;
|
|
int is_last, is_short;
|
|
|
|
count = write_packet(ep, req, EP0_FIFO_SIZE);
|
|
inc_ep_stats_bytes(ep, count, USB_DIR_IN);
|
|
|
|
is_short = (count < EP0_FIFO_SIZE);
|
|
is_last = ((count == 0) || (count < EP0_FIFO_SIZE));
|
|
|
|
/* Sends either a short packet or a 0 length packet */
|
|
if (unlikely(is_short))
|
|
ep_write_UDCCSR(ep, UDCCSR0_IPR);
|
|
|
|
ep_dbg(ep, "in %d bytes%s%s, %d left, req=%p, udccsr0=0x%03x\n",
|
|
count, is_short ? "/S" : "", is_last ? "/L" : "",
|
|
req->req.length - req->req.actual,
|
|
&req->req, udc_ep_readl(ep, UDCCSR));
|
|
|
|
return is_last;
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_queue - Queue a request into an IN endpoint
|
|
* @_ep: usb endpoint
|
|
* @_req: usb request
|
|
* @gfp_flags: flags
|
|
*
|
|
* Context: normally called when !in_interrupt, but callable when in_interrupt()
|
|
* in the special case of ep0 setup :
|
|
* (irq->handle_ep0_ctrl_req->gadget_setup->pxa_ep_queue)
|
|
*
|
|
* Returns 0 if succedeed, error otherwise
|
|
*/
|
|
static int pxa_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct udc_usb_ep *udc_usb_ep;
|
|
struct pxa_ep *ep;
|
|
struct pxa27x_request *req;
|
|
struct pxa_udc *dev;
|
|
unsigned long flags;
|
|
int rc = 0;
|
|
int is_first_req;
|
|
unsigned length;
|
|
int recursion_detected;
|
|
|
|
req = container_of(_req, struct pxa27x_request, req);
|
|
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
|
|
|
|
if (unlikely(!_req || !_req->complete || !_req->buf))
|
|
return -EINVAL;
|
|
|
|
if (unlikely(!_ep))
|
|
return -EINVAL;
|
|
|
|
dev = udc_usb_ep->dev;
|
|
ep = udc_usb_ep->pxa_ep;
|
|
if (unlikely(!ep))
|
|
return -EINVAL;
|
|
|
|
dev = ep->dev;
|
|
if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
|
|
ep_dbg(ep, "bogus device state\n");
|
|
return -ESHUTDOWN;
|
|
}
|
|
|
|
/* iso is always one packet per request, that's the only way
|
|
* we can report per-packet status. that also helps with dma.
|
|
*/
|
|
if (unlikely(EPXFERTYPE_is_ISO(ep)
|
|
&& req->req.length > ep->fifo_size))
|
|
return -EMSGSIZE;
|
|
|
|
spin_lock_irqsave(&ep->lock, flags);
|
|
recursion_detected = ep->in_handle_ep;
|
|
|
|
is_first_req = list_empty(&ep->queue);
|
|
ep_dbg(ep, "queue req %p(first=%s), len %d buf %p\n",
|
|
_req, is_first_req ? "yes" : "no",
|
|
_req->length, _req->buf);
|
|
|
|
if (!ep->enabled) {
|
|
_req->status = -ESHUTDOWN;
|
|
rc = -ESHUTDOWN;
|
|
goto out_locked;
|
|
}
|
|
|
|
if (req->in_use) {
|
|
ep_err(ep, "refusing to queue req %p (already queued)\n", req);
|
|
goto out_locked;
|
|
}
|
|
|
|
length = _req->length;
|
|
_req->status = -EINPROGRESS;
|
|
_req->actual = 0;
|
|
|
|
ep_add_request(ep, req);
|
|
spin_unlock_irqrestore(&ep->lock, flags);
|
|
|
|
if (is_ep0(ep)) {
|
|
switch (dev->ep0state) {
|
|
case WAIT_ACK_SET_CONF_INTERF:
|
|
if (length == 0) {
|
|
ep_end_in_req(ep, req, NULL);
|
|
} else {
|
|
ep_err(ep, "got a request of %d bytes while"
|
|
"in state WAIT_ACK_SET_CONF_INTERF\n",
|
|
length);
|
|
ep_del_request(ep, req);
|
|
rc = -EL2HLT;
|
|
}
|
|
ep0_idle(ep->dev);
|
|
break;
|
|
case IN_DATA_STAGE:
|
|
if (!ep_is_full(ep))
|
|
if (write_ep0_fifo(ep, req))
|
|
ep0_end_in_req(ep, req, NULL);
|
|
break;
|
|
case OUT_DATA_STAGE:
|
|
if ((length == 0) || !epout_has_pkt(ep))
|
|
if (read_ep0_fifo(ep, req))
|
|
ep0_end_out_req(ep, req, NULL);
|
|
break;
|
|
default:
|
|
ep_err(ep, "odd state %s to send me a request\n",
|
|
EP0_STNAME(ep->dev));
|
|
ep_del_request(ep, req);
|
|
rc = -EL2HLT;
|
|
break;
|
|
}
|
|
} else {
|
|
if (!recursion_detected)
|
|
handle_ep(ep);
|
|
}
|
|
|
|
out:
|
|
return rc;
|
|
out_locked:
|
|
spin_unlock_irqrestore(&ep->lock, flags);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_dequeue - Dequeue one request
|
|
* @_ep: usb endpoint
|
|
* @_req: usb request
|
|
*
|
|
* Return 0 if no error, -EINVAL or -ECONNRESET otherwise
|
|
*/
|
|
static int pxa_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
|
|
{
|
|
struct pxa_ep *ep;
|
|
struct udc_usb_ep *udc_usb_ep;
|
|
struct pxa27x_request *req;
|
|
unsigned long flags;
|
|
int rc = -EINVAL;
|
|
|
|
if (!_ep)
|
|
return rc;
|
|
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
|
|
ep = udc_usb_ep->pxa_ep;
|
|
if (!ep || is_ep0(ep))
|
|
return rc;
|
|
|
|
spin_lock_irqsave(&ep->lock, flags);
|
|
|
|
/* make sure it's actually queued on this endpoint */
|
|
list_for_each_entry(req, &ep->queue, queue) {
|
|
if (&req->req == _req) {
|
|
rc = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&ep->lock, flags);
|
|
if (!rc)
|
|
req_done(ep, req, -ECONNRESET, NULL);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_set_halt - Halts operations on one endpoint
|
|
* @_ep: usb endpoint
|
|
* @value:
|
|
*
|
|
* Returns 0 if no error, -EINVAL, -EROFS, -EAGAIN otherwise
|
|
*/
|
|
static int pxa_ep_set_halt(struct usb_ep *_ep, int value)
|
|
{
|
|
struct pxa_ep *ep;
|
|
struct udc_usb_ep *udc_usb_ep;
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
|
|
if (!_ep)
|
|
return -EINVAL;
|
|
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
|
|
ep = udc_usb_ep->pxa_ep;
|
|
if (!ep || is_ep0(ep))
|
|
return -EINVAL;
|
|
|
|
if (value == 0) {
|
|
/*
|
|
* This path (reset toggle+halt) is needed to implement
|
|
* SET_INTERFACE on normal hardware. but it can't be
|
|
* done from software on the PXA UDC, and the hardware
|
|
* forgets to do it as part of SET_INTERFACE automagic.
|
|
*/
|
|
ep_dbg(ep, "only host can clear halt\n");
|
|
return -EROFS;
|
|
}
|
|
|
|
spin_lock_irqsave(&ep->lock, flags);
|
|
|
|
rc = -EAGAIN;
|
|
if (ep->dir_in && (ep_is_full(ep) || !list_empty(&ep->queue)))
|
|
goto out;
|
|
|
|
/* FST, FEF bits are the same for control and non control endpoints */
|
|
rc = 0;
|
|
ep_write_UDCCSR(ep, UDCCSR_FST | UDCCSR_FEF);
|
|
if (is_ep0(ep))
|
|
set_ep0state(ep->dev, STALL);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&ep->lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_fifo_status - Get how many bytes in physical endpoint
|
|
* @_ep: usb endpoint
|
|
*
|
|
* Returns number of bytes in OUT fifos. Broken for IN fifos.
|
|
*/
|
|
static int pxa_ep_fifo_status(struct usb_ep *_ep)
|
|
{
|
|
struct pxa_ep *ep;
|
|
struct udc_usb_ep *udc_usb_ep;
|
|
|
|
if (!_ep)
|
|
return -ENODEV;
|
|
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
|
|
ep = udc_usb_ep->pxa_ep;
|
|
if (!ep || is_ep0(ep))
|
|
return -ENODEV;
|
|
|
|
if (ep->dir_in)
|
|
return -EOPNOTSUPP;
|
|
if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN || ep_is_empty(ep))
|
|
return 0;
|
|
else
|
|
return ep_count_bytes_remain(ep) + 1;
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_fifo_flush - Flushes one endpoint
|
|
* @_ep: usb endpoint
|
|
*
|
|
* Discards all data in one endpoint(IN or OUT), except control endpoint.
|
|
*/
|
|
static void pxa_ep_fifo_flush(struct usb_ep *_ep)
|
|
{
|
|
struct pxa_ep *ep;
|
|
struct udc_usb_ep *udc_usb_ep;
|
|
unsigned long flags;
|
|
|
|
if (!_ep)
|
|
return;
|
|
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
|
|
ep = udc_usb_ep->pxa_ep;
|
|
if (!ep || is_ep0(ep))
|
|
return;
|
|
|
|
spin_lock_irqsave(&ep->lock, flags);
|
|
|
|
if (unlikely(!list_empty(&ep->queue)))
|
|
ep_dbg(ep, "called while queue list not empty\n");
|
|
ep_dbg(ep, "called\n");
|
|
|
|
/* for OUT, just read and discard the FIFO contents. */
|
|
if (!ep->dir_in) {
|
|
while (!ep_is_empty(ep))
|
|
udc_ep_readl(ep, UDCDR);
|
|
} else {
|
|
/* most IN status is the same, but ISO can't stall */
|
|
ep_write_UDCCSR(ep,
|
|
UDCCSR_PC | UDCCSR_FEF | UDCCSR_TRN
|
|
| (EPXFERTYPE_is_ISO(ep) ? 0 : UDCCSR_SST));
|
|
}
|
|
|
|
spin_unlock_irqrestore(&ep->lock, flags);
|
|
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_enable - Enables usb endpoint
|
|
* @_ep: usb endpoint
|
|
* @desc: usb endpoint descriptor
|
|
*
|
|
* Nothing much to do here, as ep configuration is done once and for all
|
|
* before udc is enabled. After udc enable, no physical endpoint configuration
|
|
* can be changed.
|
|
* Function makes sanity checks and flushes the endpoint.
|
|
*/
|
|
static int pxa_ep_enable(struct usb_ep *_ep,
|
|
const struct usb_endpoint_descriptor *desc)
|
|
{
|
|
struct pxa_ep *ep;
|
|
struct udc_usb_ep *udc_usb_ep;
|
|
struct pxa_udc *udc;
|
|
|
|
if (!_ep || !desc)
|
|
return -EINVAL;
|
|
|
|
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
|
|
if (udc_usb_ep->pxa_ep) {
|
|
ep = udc_usb_ep->pxa_ep;
|
|
ep_warn(ep, "usb_ep %s already enabled, doing nothing\n",
|
|
_ep->name);
|
|
} else {
|
|
ep = find_pxa_ep(udc_usb_ep->dev, udc_usb_ep);
|
|
}
|
|
|
|
if (!ep || is_ep0(ep)) {
|
|
dev_err(udc_usb_ep->dev->dev,
|
|
"unable to match pxa_ep for ep %s\n",
|
|
_ep->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((desc->bDescriptorType != USB_DT_ENDPOINT)
|
|
|| (ep->type != usb_endpoint_type(desc))) {
|
|
ep_err(ep, "type mismatch\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ep->fifo_size < le16_to_cpu(desc->wMaxPacketSize)) {
|
|
ep_err(ep, "bad maxpacket\n");
|
|
return -ERANGE;
|
|
}
|
|
|
|
udc_usb_ep->pxa_ep = ep;
|
|
udc = ep->dev;
|
|
|
|
if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
|
|
ep_err(ep, "bogus device state\n");
|
|
return -ESHUTDOWN;
|
|
}
|
|
|
|
ep->enabled = 1;
|
|
|
|
/* flush fifo (mostly for OUT buffers) */
|
|
pxa_ep_fifo_flush(_ep);
|
|
|
|
ep_dbg(ep, "enabled\n");
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pxa_ep_disable - Disable usb endpoint
|
|
* @_ep: usb endpoint
|
|
*
|
|
* Same as for pxa_ep_enable, no physical endpoint configuration can be
|
|
* changed.
|
|
* Function flushes the endpoint and related requests.
|
|
*/
|
|
static int pxa_ep_disable(struct usb_ep *_ep)
|
|
{
|
|
struct pxa_ep *ep;
|
|
struct udc_usb_ep *udc_usb_ep;
|
|
|
|
if (!_ep)
|
|
return -EINVAL;
|
|
|
|
udc_usb_ep = container_of(_ep, struct udc_usb_ep, usb_ep);
|
|
ep = udc_usb_ep->pxa_ep;
|
|
if (!ep || is_ep0(ep) || !list_empty(&ep->queue))
|
|
return -EINVAL;
|
|
|
|
ep->enabled = 0;
|
|
nuke(ep, -ESHUTDOWN);
|
|
|
|
pxa_ep_fifo_flush(_ep);
|
|
udc_usb_ep->pxa_ep = NULL;
|
|
|
|
ep_dbg(ep, "disabled\n");
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_ep_ops pxa_ep_ops = {
|
|
.enable = pxa_ep_enable,
|
|
.disable = pxa_ep_disable,
|
|
|
|
.alloc_request = pxa_ep_alloc_request,
|
|
.free_request = pxa_ep_free_request,
|
|
|
|
.queue = pxa_ep_queue,
|
|
.dequeue = pxa_ep_dequeue,
|
|
|
|
.set_halt = pxa_ep_set_halt,
|
|
.fifo_status = pxa_ep_fifo_status,
|
|
.fifo_flush = pxa_ep_fifo_flush,
|
|
};
|
|
|
|
/**
|
|
* dplus_pullup - Connect or disconnect pullup resistor to D+ pin
|
|
* @udc: udc device
|
|
* @on: 0 if disconnect pullup resistor, 1 otherwise
|
|
* Context: any
|
|
*
|
|
* Handle D+ pullup resistor, make the device visible to the usb bus, and
|
|
* declare it as a full speed usb device
|
|
*/
|
|
static void dplus_pullup(struct pxa_udc *udc, int on)
|
|
{
|
|
if (on) {
|
|
if (gpio_is_valid(udc->mach->gpio_pullup))
|
|
gpio_set_value(udc->mach->gpio_pullup,
|
|
!udc->mach->gpio_pullup_inverted);
|
|
if (udc->mach->udc_command)
|
|
udc->mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
|
|
} else {
|
|
if (gpio_is_valid(udc->mach->gpio_pullup))
|
|
gpio_set_value(udc->mach->gpio_pullup,
|
|
udc->mach->gpio_pullup_inverted);
|
|
if (udc->mach->udc_command)
|
|
udc->mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
|
|
}
|
|
udc->pullup_on = on;
|
|
}
|
|
|
|
/**
|
|
* pxa_udc_get_frame - Returns usb frame number
|
|
* @_gadget: usb gadget
|
|
*/
|
|
static int pxa_udc_get_frame(struct usb_gadget *_gadget)
|
|
{
|
|
struct pxa_udc *udc = to_gadget_udc(_gadget);
|
|
|
|
return (udc_readl(udc, UDCFNR) & 0x7ff);
|
|
}
|
|
|
|
/**
|
|
* pxa_udc_wakeup - Force udc device out of suspend
|
|
* @_gadget: usb gadget
|
|
*
|
|
* Returns 0 if successfull, error code otherwise
|
|
*/
|
|
static int pxa_udc_wakeup(struct usb_gadget *_gadget)
|
|
{
|
|
struct pxa_udc *udc = to_gadget_udc(_gadget);
|
|
|
|
/* host may not have enabled remote wakeup */
|
|
if ((udc_readl(udc, UDCCR) & UDCCR_DWRE) == 0)
|
|
return -EHOSTUNREACH;
|
|
udc_set_mask_UDCCR(udc, UDCCR_UDR);
|
|
return 0;
|
|
}
|
|
|
|
static void udc_enable(struct pxa_udc *udc);
|
|
static void udc_disable(struct pxa_udc *udc);
|
|
|
|
/**
|
|
* should_enable_udc - Tells if UDC should be enabled
|
|
* @udc: udc device
|
|
* Context: any
|
|
*
|
|
* The UDC should be enabled if :
|
|
|
|
* - the pullup resistor is connected
|
|
* - and a gadget driver is bound
|
|
* - and vbus is sensed (or no vbus sense is available)
|
|
*
|
|
* Returns 1 if UDC should be enabled, 0 otherwise
|
|
*/
|
|
static int should_enable_udc(struct pxa_udc *udc)
|
|
{
|
|
int put_on;
|
|
|
|
put_on = ((udc->pullup_on) && (udc->driver));
|
|
put_on &= ((udc->vbus_sensed) || (!udc->transceiver));
|
|
return put_on;
|
|
}
|
|
|
|
/**
|
|
* should_disable_udc - Tells if UDC should be disabled
|
|
* @udc: udc device
|
|
* Context: any
|
|
*
|
|
* The UDC should be disabled if :
|
|
* - the pullup resistor is not connected
|
|
* - or no gadget driver is bound
|
|
* - or no vbus is sensed (when vbus sesing is available)
|
|
*
|
|
* Returns 1 if UDC should be disabled
|
|
*/
|
|
static int should_disable_udc(struct pxa_udc *udc)
|
|
{
|
|
int put_off;
|
|
|
|
put_off = ((!udc->pullup_on) || (!udc->driver));
|
|
put_off |= ((!udc->vbus_sensed) && (udc->transceiver));
|
|
return put_off;
|
|
}
|
|
|
|
/**
|
|
* pxa_udc_pullup - Offer manual D+ pullup control
|
|
* @_gadget: usb gadget using the control
|
|
* @is_active: 0 if disconnect, else connect D+ pullup resistor
|
|
* Context: !in_interrupt()
|
|
*
|
|
* Returns 0 if OK, -EOPNOTSUPP if udc driver doesn't handle D+ pullup
|
|
*/
|
|
static int pxa_udc_pullup(struct usb_gadget *_gadget, int is_active)
|
|
{
|
|
struct pxa_udc *udc = to_gadget_udc(_gadget);
|
|
|
|
if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command)
|
|
return -EOPNOTSUPP;
|
|
|
|
dplus_pullup(udc, is_active);
|
|
|
|
if (should_enable_udc(udc))
|
|
udc_enable(udc);
|
|
if (should_disable_udc(udc))
|
|
udc_disable(udc);
|
|
return 0;
|
|
}
|
|
|
|
static void udc_enable(struct pxa_udc *udc);
|
|
static void udc_disable(struct pxa_udc *udc);
|
|
|
|
/**
|
|
* pxa_udc_vbus_session - Called by external transceiver to enable/disable udc
|
|
* @_gadget: usb gadget
|
|
* @is_active: 0 if should disable the udc, 1 if should enable
|
|
*
|
|
* Enables the udc, and optionnaly activates D+ pullup resistor. Or disables the
|
|
* udc, and deactivates D+ pullup resistor.
|
|
*
|
|
* Returns 0
|
|
*/
|
|
static int pxa_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
|
|
{
|
|
struct pxa_udc *udc = to_gadget_udc(_gadget);
|
|
|
|
udc->vbus_sensed = is_active;
|
|
if (should_enable_udc(udc))
|
|
udc_enable(udc);
|
|
if (should_disable_udc(udc))
|
|
udc_disable(udc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pxa_udc_vbus_draw - Called by gadget driver after SET_CONFIGURATION completed
|
|
* @_gadget: usb gadget
|
|
* @mA: current drawn
|
|
*
|
|
* Context: !in_interrupt()
|
|
*
|
|
* Called after a configuration was chosen by a USB host, to inform how much
|
|
* current can be drawn by the device from VBus line.
|
|
*
|
|
* Returns 0 or -EOPNOTSUPP if no transceiver is handling the udc
|
|
*/
|
|
static int pxa_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
|
|
{
|
|
struct pxa_udc *udc;
|
|
|
|
udc = to_gadget_udc(_gadget);
|
|
if (udc->transceiver)
|
|
return otg_set_power(udc->transceiver, mA);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static const struct usb_gadget_ops pxa_udc_ops = {
|
|
.get_frame = pxa_udc_get_frame,
|
|
.wakeup = pxa_udc_wakeup,
|
|
.pullup = pxa_udc_pullup,
|
|
.vbus_session = pxa_udc_vbus_session,
|
|
.vbus_draw = pxa_udc_vbus_draw,
|
|
};
|
|
|
|
/**
|
|
* udc_disable - disable udc device controller
|
|
* @udc: udc device
|
|
* Context: any
|
|
*
|
|
* Disables the udc device : disables clocks, udc interrupts, control endpoint
|
|
* interrupts.
|
|
*/
|
|
static void udc_disable(struct pxa_udc *udc)
|
|
{
|
|
if (!udc->enabled)
|
|
return;
|
|
|
|
udc_writel(udc, UDCICR0, 0);
|
|
udc_writel(udc, UDCICR1, 0);
|
|
|
|
udc_clear_mask_UDCCR(udc, UDCCR_UDE);
|
|
clk_disable(udc->clk);
|
|
|
|
ep0_idle(udc);
|
|
udc->gadget.speed = USB_SPEED_UNKNOWN;
|
|
|
|
udc->enabled = 0;
|
|
}
|
|
|
|
/**
|
|
* udc_init_data - Initialize udc device data structures
|
|
* @dev: udc device
|
|
*
|
|
* Initializes gadget endpoint list, endpoints locks. No action is taken
|
|
* on the hardware.
|
|
*/
|
|
static __init void udc_init_data(struct pxa_udc *dev)
|
|
{
|
|
int i;
|
|
struct pxa_ep *ep;
|
|
|
|
/* device/ep0 records init */
|
|
INIT_LIST_HEAD(&dev->gadget.ep_list);
|
|
INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
|
|
dev->udc_usb_ep[0].pxa_ep = &dev->pxa_ep[0];
|
|
ep0_idle(dev);
|
|
|
|
/* PXA endpoints init */
|
|
for (i = 0; i < NR_PXA_ENDPOINTS; i++) {
|
|
ep = &dev->pxa_ep[i];
|
|
|
|
ep->enabled = is_ep0(ep);
|
|
INIT_LIST_HEAD(&ep->queue);
|
|
spin_lock_init(&ep->lock);
|
|
}
|
|
|
|
/* USB endpoints init */
|
|
for (i = 1; i < NR_USB_ENDPOINTS; i++)
|
|
list_add_tail(&dev->udc_usb_ep[i].usb_ep.ep_list,
|
|
&dev->gadget.ep_list);
|
|
}
|
|
|
|
/**
|
|
* udc_enable - Enables the udc device
|
|
* @dev: udc device
|
|
*
|
|
* Enables the udc device : enables clocks, udc interrupts, control endpoint
|
|
* interrupts, sets usb as UDC client and setups endpoints.
|
|
*/
|
|
static void udc_enable(struct pxa_udc *udc)
|
|
{
|
|
if (udc->enabled)
|
|
return;
|
|
|
|
udc_writel(udc, UDCICR0, 0);
|
|
udc_writel(udc, UDCICR1, 0);
|
|
udc_clear_mask_UDCCR(udc, UDCCR_UDE);
|
|
|
|
clk_enable(udc->clk);
|
|
|
|
ep0_idle(udc);
|
|
udc->gadget.speed = USB_SPEED_FULL;
|
|
memset(&udc->stats, 0, sizeof(udc->stats));
|
|
|
|
udc_set_mask_UDCCR(udc, UDCCR_UDE);
|
|
ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_ACM);
|
|
udelay(2);
|
|
if (udc_readl(udc, UDCCR) & UDCCR_EMCE)
|
|
dev_err(udc->dev, "Configuration errors, udc disabled\n");
|
|
|
|
/*
|
|
* Caller must be able to sleep in order to cope with startup transients
|
|
*/
|
|
msleep(100);
|
|
|
|
/* enable suspend/resume and reset irqs */
|
|
udc_writel(udc, UDCICR1,
|
|
UDCICR1_IECC | UDCICR1_IERU
|
|
| UDCICR1_IESU | UDCICR1_IERS);
|
|
|
|
/* enable ep0 irqs */
|
|
pio_irq_enable(&udc->pxa_ep[0]);
|
|
|
|
udc->enabled = 1;
|
|
}
|
|
|
|
/**
|
|
* usb_gadget_register_driver - Register gadget driver
|
|
* @driver: gadget driver
|
|
*
|
|
* 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.
|
|
*
|
|
* Note that the udc is not automatically enabled. Check function
|
|
* should_enable_udc().
|
|
*
|
|
* Returns 0 if no error, -EINVAL, -ENODEV, -EBUSY otherwise
|
|
*/
|
|
int usb_gadget_register_driver(struct usb_gadget_driver *driver)
|
|
{
|
|
struct pxa_udc *udc = the_controller;
|
|
int retval;
|
|
|
|
if (!driver || driver->speed < USB_SPEED_FULL || !driver->bind
|
|
|| !driver->disconnect || !driver->setup)
|
|
return -EINVAL;
|
|
if (!udc)
|
|
return -ENODEV;
|
|
if (udc->driver)
|
|
return -EBUSY;
|
|
|
|
/* first hook up the driver ... */
|
|
udc->driver = driver;
|
|
udc->gadget.dev.driver = &driver->driver;
|
|
dplus_pullup(udc, 1);
|
|
|
|
retval = device_add(&udc->gadget.dev);
|
|
if (retval) {
|
|
dev_err(udc->dev, "device_add error %d\n", retval);
|
|
goto add_fail;
|
|
}
|
|
retval = driver->bind(&udc->gadget);
|
|
if (retval) {
|
|
dev_err(udc->dev, "bind to driver %s --> error %d\n",
|
|
driver->driver.name, retval);
|
|
goto bind_fail;
|
|
}
|
|
dev_dbg(udc->dev, "registered gadget driver '%s'\n",
|
|
driver->driver.name);
|
|
|
|
if (udc->transceiver) {
|
|
retval = otg_set_peripheral(udc->transceiver, &udc->gadget);
|
|
if (retval) {
|
|
dev_err(udc->dev, "can't bind to transceiver\n");
|
|
goto transceiver_fail;
|
|
}
|
|
}
|
|
|
|
if (should_enable_udc(udc))
|
|
udc_enable(udc);
|
|
return 0;
|
|
|
|
transceiver_fail:
|
|
if (driver->unbind)
|
|
driver->unbind(&udc->gadget);
|
|
bind_fail:
|
|
device_del(&udc->gadget.dev);
|
|
add_fail:
|
|
udc->driver = NULL;
|
|
udc->gadget.dev.driver = NULL;
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL(usb_gadget_register_driver);
|
|
|
|
|
|
/**
|
|
* stop_activity - Stops udc endpoints
|
|
* @udc: udc device
|
|
* @driver: gadget driver
|
|
*
|
|
* Disables all udc endpoints (even control endpoint), report disconnect to
|
|
* the gadget user.
|
|
*/
|
|
static void stop_activity(struct pxa_udc *udc, struct usb_gadget_driver *driver)
|
|
{
|
|
int i;
|
|
|
|
/* don't disconnect drivers more than once */
|
|
if (udc->gadget.speed == USB_SPEED_UNKNOWN)
|
|
driver = NULL;
|
|
udc->gadget.speed = USB_SPEED_UNKNOWN;
|
|
|
|
for (i = 0; i < NR_USB_ENDPOINTS; i++)
|
|
pxa_ep_disable(&udc->udc_usb_ep[i].usb_ep);
|
|
|
|
if (driver)
|
|
driver->disconnect(&udc->gadget);
|
|
}
|
|
|
|
/**
|
|
* usb_gadget_unregister_driver - Unregister the gadget driver
|
|
* @driver: gadget driver
|
|
*
|
|
* Returns 0 if no error, -ENODEV, -EINVAL otherwise
|
|
*/
|
|
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
|
|
{
|
|
struct pxa_udc *udc = the_controller;
|
|
|
|
if (!udc)
|
|
return -ENODEV;
|
|
if (!driver || driver != udc->driver || !driver->unbind)
|
|
return -EINVAL;
|
|
|
|
stop_activity(udc, driver);
|
|
udc_disable(udc);
|
|
dplus_pullup(udc, 0);
|
|
|
|
driver->unbind(&udc->gadget);
|
|
udc->driver = NULL;
|
|
|
|
device_del(&udc->gadget.dev);
|
|
dev_info(udc->dev, "unregistered gadget driver '%s'\n",
|
|
driver->driver.name);
|
|
|
|
if (udc->transceiver)
|
|
return otg_set_peripheral(udc->transceiver, NULL);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(usb_gadget_unregister_driver);
|
|
|
|
/**
|
|
* handle_ep0_ctrl_req - handle control endpoint control request
|
|
* @udc: udc device
|
|
* @req: control request
|
|
*/
|
|
static void handle_ep0_ctrl_req(struct pxa_udc *udc,
|
|
struct pxa27x_request *req)
|
|
{
|
|
struct pxa_ep *ep = &udc->pxa_ep[0];
|
|
union {
|
|
struct usb_ctrlrequest r;
|
|
u32 word[2];
|
|
} u;
|
|
int i;
|
|
int have_extrabytes = 0;
|
|
unsigned long flags;
|
|
|
|
nuke(ep, -EPROTO);
|
|
spin_lock_irqsave(&ep->lock, flags);
|
|
|
|
/*
|
|
* In the PXA320 manual, in the section about Back-to-Back setup
|
|
* packets, it describes this situation. The solution is to set OPC to
|
|
* get rid of the status packet, and then continue with the setup
|
|
* packet. Generalize to pxa27x CPUs.
|
|
*/
|
|
if (epout_has_pkt(ep) && (ep_count_bytes_remain(ep) == 0))
|
|
ep_write_UDCCSR(ep, UDCCSR0_OPC);
|
|
|
|
/* read SETUP packet */
|
|
for (i = 0; i < 2; i++) {
|
|
if (unlikely(ep_is_empty(ep)))
|
|
goto stall;
|
|
u.word[i] = udc_ep_readl(ep, UDCDR);
|
|
}
|
|
|
|
have_extrabytes = !ep_is_empty(ep);
|
|
while (!ep_is_empty(ep)) {
|
|
i = udc_ep_readl(ep, UDCDR);
|
|
ep_err(ep, "wrong to have extra bytes for setup : 0x%08x\n", i);
|
|
}
|
|
|
|
ep_dbg(ep, "SETUP %02x.%02x v%04x i%04x l%04x\n",
|
|
u.r.bRequestType, u.r.bRequest,
|
|
le16_to_cpu(u.r.wValue), le16_to_cpu(u.r.wIndex),
|
|
le16_to_cpu(u.r.wLength));
|
|
if (unlikely(have_extrabytes))
|
|
goto stall;
|
|
|
|
if (u.r.bRequestType & USB_DIR_IN)
|
|
set_ep0state(udc, IN_DATA_STAGE);
|
|
else
|
|
set_ep0state(udc, OUT_DATA_STAGE);
|
|
|
|
/* Tell UDC to enter Data Stage */
|
|
ep_write_UDCCSR(ep, UDCCSR0_SA | UDCCSR0_OPC);
|
|
|
|
spin_unlock_irqrestore(&ep->lock, flags);
|
|
i = udc->driver->setup(&udc->gadget, &u.r);
|
|
spin_lock_irqsave(&ep->lock, flags);
|
|
if (i < 0)
|
|
goto stall;
|
|
out:
|
|
spin_unlock_irqrestore(&ep->lock, flags);
|
|
return;
|
|
stall:
|
|
ep_dbg(ep, "protocol STALL, udccsr0=%03x err %d\n",
|
|
udc_ep_readl(ep, UDCCSR), i);
|
|
ep_write_UDCCSR(ep, UDCCSR0_FST | UDCCSR0_FTF);
|
|
set_ep0state(udc, STALL);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* handle_ep0 - Handle control endpoint data transfers
|
|
* @udc: udc device
|
|
* @fifo_irq: 1 if triggered by fifo service type irq
|
|
* @opc_irq: 1 if triggered by output packet complete type irq
|
|
*
|
|
* Context : when in_interrupt() or with ep->lock held
|
|
*
|
|
* Tries to transfer all pending request data into the endpoint and/or
|
|
* transfer all pending data in the endpoint into usb requests.
|
|
* Handles states of ep0 automata.
|
|
*
|
|
* PXA27x hardware handles several standard usb control requests without
|
|
* driver notification. The requests fully handled by hardware are :
|
|
* SET_ADDRESS, SET_FEATURE, CLEAR_FEATURE, GET_CONFIGURATION, GET_INTERFACE,
|
|
* GET_STATUS
|
|
* The requests handled by hardware, but with irq notification are :
|
|
* SYNCH_FRAME, SET_CONFIGURATION, SET_INTERFACE
|
|
* The remaining standard requests really handled by handle_ep0 are :
|
|
* GET_DESCRIPTOR, SET_DESCRIPTOR, specific requests.
|
|
* Requests standardized outside of USB 2.0 chapter 9 are handled more
|
|
* uniformly, by gadget drivers.
|
|
*
|
|
* The control endpoint state machine is _not_ USB spec compliant, it's even
|
|
* hardly compliant with Intel PXA270 developers guide.
|
|
* The key points which inferred this state machine are :
|
|
* - on every setup token, bit UDCCSR0_SA is raised and held until cleared by
|
|
* software.
|
|
* - on every OUT packet received, UDCCSR0_OPC is raised and held until
|
|
* cleared by software.
|
|
* - clearing UDCCSR0_OPC always flushes ep0. If in setup stage, never do it
|
|
* before reading ep0.
|
|
* This is true only for PXA27x. This is not true anymore for PXA3xx family
|
|
* (check Back-to-Back setup packet in developers guide).
|
|
* - irq can be called on a "packet complete" event (opc_irq=1), while
|
|
* UDCCSR0_OPC is not yet raised (delta can be as big as 100ms
|
|
* from experimentation).
|
|
* - as UDCCSR0_SA can be activated while in irq handling, and clearing
|
|
* UDCCSR0_OPC would flush the setup data, we almost never clear UDCCSR0_OPC
|
|
* => we never actually read the "status stage" packet of an IN data stage
|
|
* => this is not documented in Intel documentation
|
|
* - hardware as no idea of STATUS STAGE, it only handle SETUP STAGE and DATA
|
|
* STAGE. The driver add STATUS STAGE to send last zero length packet in
|
|
* OUT_STATUS_STAGE.
|
|
* - special attention was needed for IN_STATUS_STAGE. If a packet complete
|
|
* event is detected, we terminate the status stage without ackowledging the
|
|
* packet (not to risk to loose a potential SETUP packet)
|
|
*/
|
|
static void handle_ep0(struct pxa_udc *udc, int fifo_irq, int opc_irq)
|
|
{
|
|
u32 udccsr0;
|
|
struct pxa_ep *ep = &udc->pxa_ep[0];
|
|
struct pxa27x_request *req = NULL;
|
|
int completed = 0;
|
|
|
|
if (!list_empty(&ep->queue))
|
|
req = list_entry(ep->queue.next, struct pxa27x_request, queue);
|
|
|
|
udccsr0 = udc_ep_readl(ep, UDCCSR);
|
|
ep_dbg(ep, "state=%s, req=%p, udccsr0=0x%03x, udcbcr=%d, irq_msk=%x\n",
|
|
EP0_STNAME(udc), req, udccsr0, udc_ep_readl(ep, UDCBCR),
|
|
(fifo_irq << 1 | opc_irq));
|
|
|
|
if (udccsr0 & UDCCSR0_SST) {
|
|
ep_dbg(ep, "clearing stall status\n");
|
|
nuke(ep, -EPIPE);
|
|
ep_write_UDCCSR(ep, UDCCSR0_SST);
|
|
ep0_idle(udc);
|
|
}
|
|
|
|
if (udccsr0 & UDCCSR0_SA) {
|
|
nuke(ep, 0);
|
|
set_ep0state(udc, SETUP_STAGE);
|
|
}
|
|
|
|
switch (udc->ep0state) {
|
|
case WAIT_FOR_SETUP:
|
|
/*
|
|
* Hardware bug : beware, we cannot clear OPC, since we would
|
|
* miss a potential OPC irq for a setup packet.
|
|
* So, we only do ... nothing, and hope for a next irq with
|
|
* UDCCSR0_SA set.
|
|
*/
|
|
break;
|
|
case SETUP_STAGE:
|
|
udccsr0 &= UDCCSR0_CTRL_REQ_MASK;
|
|
if (likely(udccsr0 == UDCCSR0_CTRL_REQ_MASK))
|
|
handle_ep0_ctrl_req(udc, req);
|
|
break;
|
|
case IN_DATA_STAGE: /* GET_DESCRIPTOR */
|
|
if (epout_has_pkt(ep))
|
|
ep_write_UDCCSR(ep, UDCCSR0_OPC);
|
|
if (req && !ep_is_full(ep))
|
|
completed = write_ep0_fifo(ep, req);
|
|
if (completed)
|
|
ep0_end_in_req(ep, req, NULL);
|
|
break;
|
|
case OUT_DATA_STAGE: /* SET_DESCRIPTOR */
|
|
if (epout_has_pkt(ep) && req)
|
|
completed = read_ep0_fifo(ep, req);
|
|
if (completed)
|
|
ep0_end_out_req(ep, req, NULL);
|
|
break;
|
|
case STALL:
|
|
ep_write_UDCCSR(ep, UDCCSR0_FST);
|
|
break;
|
|
case IN_STATUS_STAGE:
|
|
/*
|
|
* Hardware bug : beware, we cannot clear OPC, since we would
|
|
* miss a potential PC irq for a setup packet.
|
|
* So, we only put the ep0 into WAIT_FOR_SETUP state.
|
|
*/
|
|
if (opc_irq)
|
|
ep0_idle(udc);
|
|
break;
|
|
case OUT_STATUS_STAGE:
|
|
case WAIT_ACK_SET_CONF_INTERF:
|
|
ep_warn(ep, "should never get in %s state here!!!\n",
|
|
EP0_STNAME(ep->dev));
|
|
ep0_idle(udc);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* handle_ep - Handle endpoint data tranfers
|
|
* @ep: pxa physical endpoint
|
|
*
|
|
* Tries to transfer all pending request data into the endpoint and/or
|
|
* transfer all pending data in the endpoint into usb requests.
|
|
*
|
|
* Is always called when in_interrupt() and with ep->lock released.
|
|
*/
|
|
static void handle_ep(struct pxa_ep *ep)
|
|
{
|
|
struct pxa27x_request *req;
|
|
int completed;
|
|
u32 udccsr;
|
|
int is_in = ep->dir_in;
|
|
int loop = 0;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ep->lock, flags);
|
|
if (ep->in_handle_ep)
|
|
goto recursion_detected;
|
|
ep->in_handle_ep = 1;
|
|
|
|
do {
|
|
completed = 0;
|
|
udccsr = udc_ep_readl(ep, UDCCSR);
|
|
|
|
if (likely(!list_empty(&ep->queue)))
|
|
req = list_entry(ep->queue.next,
|
|
struct pxa27x_request, queue);
|
|
else
|
|
req = NULL;
|
|
|
|
ep_dbg(ep, "req:%p, udccsr 0x%03x loop=%d\n",
|
|
req, udccsr, loop++);
|
|
|
|
if (unlikely(udccsr & (UDCCSR_SST | UDCCSR_TRN)))
|
|
udc_ep_writel(ep, UDCCSR,
|
|
udccsr & (UDCCSR_SST | UDCCSR_TRN));
|
|
if (!req)
|
|
break;
|
|
|
|
if (unlikely(is_in)) {
|
|
if (likely(!ep_is_full(ep)))
|
|
completed = write_fifo(ep, req);
|
|
} else {
|
|
if (likely(epout_has_pkt(ep)))
|
|
completed = read_fifo(ep, req);
|
|
}
|
|
|
|
if (completed) {
|
|
if (is_in)
|
|
ep_end_in_req(ep, req, &flags);
|
|
else
|
|
ep_end_out_req(ep, req, &flags);
|
|
}
|
|
} while (completed);
|
|
|
|
ep->in_handle_ep = 0;
|
|
recursion_detected:
|
|
spin_unlock_irqrestore(&ep->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* pxa27x_change_configuration - Handle SET_CONF usb request notification
|
|
* @udc: udc device
|
|
* @config: usb configuration
|
|
*
|
|
* Post the request to upper level.
|
|
* Don't use any pxa specific harware configuration capabilities
|
|
*/
|
|
static void pxa27x_change_configuration(struct pxa_udc *udc, int config)
|
|
{
|
|
struct usb_ctrlrequest req ;
|
|
|
|
dev_dbg(udc->dev, "config=%d\n", config);
|
|
|
|
udc->config = config;
|
|
udc->last_interface = 0;
|
|
udc->last_alternate = 0;
|
|
|
|
req.bRequestType = 0;
|
|
req.bRequest = USB_REQ_SET_CONFIGURATION;
|
|
req.wValue = config;
|
|
req.wIndex = 0;
|
|
req.wLength = 0;
|
|
|
|
set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
|
|
udc->driver->setup(&udc->gadget, &req);
|
|
ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
|
|
}
|
|
|
|
/**
|
|
* pxa27x_change_interface - Handle SET_INTERF usb request notification
|
|
* @udc: udc device
|
|
* @iface: interface number
|
|
* @alt: alternate setting number
|
|
*
|
|
* Post the request to upper level.
|
|
* Don't use any pxa specific harware configuration capabilities
|
|
*/
|
|
static void pxa27x_change_interface(struct pxa_udc *udc, int iface, int alt)
|
|
{
|
|
struct usb_ctrlrequest req;
|
|
|
|
dev_dbg(udc->dev, "interface=%d, alternate setting=%d\n", iface, alt);
|
|
|
|
udc->last_interface = iface;
|
|
udc->last_alternate = alt;
|
|
|
|
req.bRequestType = USB_RECIP_INTERFACE;
|
|
req.bRequest = USB_REQ_SET_INTERFACE;
|
|
req.wValue = alt;
|
|
req.wIndex = iface;
|
|
req.wLength = 0;
|
|
|
|
set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
|
|
udc->driver->setup(&udc->gadget, &req);
|
|
ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
|
|
}
|
|
|
|
/*
|
|
* irq_handle_data - Handle data transfer
|
|
* @irq: irq IRQ number
|
|
* @udc: dev pxa_udc device structure
|
|
*
|
|
* Called from irq handler, transferts data to or from endpoint to queue
|
|
*/
|
|
static void irq_handle_data(int irq, struct pxa_udc *udc)
|
|
{
|
|
int i;
|
|
struct pxa_ep *ep;
|
|
u32 udcisr0 = udc_readl(udc, UDCISR0) & UDCCISR0_EP_MASK;
|
|
u32 udcisr1 = udc_readl(udc, UDCISR1) & UDCCISR1_EP_MASK;
|
|
|
|
if (udcisr0 & UDCISR_INT_MASK) {
|
|
udc->pxa_ep[0].stats.irqs++;
|
|
udc_writel(udc, UDCISR0, UDCISR_INT(0, UDCISR_INT_MASK));
|
|
handle_ep0(udc, !!(udcisr0 & UDCICR_FIFOERR),
|
|
!!(udcisr0 & UDCICR_PKTCOMPL));
|
|
}
|
|
|
|
udcisr0 >>= 2;
|
|
for (i = 1; udcisr0 != 0 && i < 16; udcisr0 >>= 2, i++) {
|
|
if (!(udcisr0 & UDCISR_INT_MASK))
|
|
continue;
|
|
|
|
udc_writel(udc, UDCISR0, UDCISR_INT(i, UDCISR_INT_MASK));
|
|
|
|
WARN_ON(i >= ARRAY_SIZE(udc->pxa_ep));
|
|
if (i < ARRAY_SIZE(udc->pxa_ep)) {
|
|
ep = &udc->pxa_ep[i];
|
|
ep->stats.irqs++;
|
|
handle_ep(ep);
|
|
}
|
|
}
|
|
|
|
for (i = 16; udcisr1 != 0 && i < 24; udcisr1 >>= 2, i++) {
|
|
udc_writel(udc, UDCISR1, UDCISR_INT(i - 16, UDCISR_INT_MASK));
|
|
if (!(udcisr1 & UDCISR_INT_MASK))
|
|
continue;
|
|
|
|
WARN_ON(i >= ARRAY_SIZE(udc->pxa_ep));
|
|
if (i < ARRAY_SIZE(udc->pxa_ep)) {
|
|
ep = &udc->pxa_ep[i];
|
|
ep->stats.irqs++;
|
|
handle_ep(ep);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* irq_udc_suspend - Handle IRQ "UDC Suspend"
|
|
* @udc: udc device
|
|
*/
|
|
static void irq_udc_suspend(struct pxa_udc *udc)
|
|
{
|
|
udc_writel(udc, UDCISR1, UDCISR1_IRSU);
|
|
udc->stats.irqs_suspend++;
|
|
|
|
if (udc->gadget.speed != USB_SPEED_UNKNOWN
|
|
&& udc->driver && udc->driver->suspend)
|
|
udc->driver->suspend(&udc->gadget);
|
|
ep0_idle(udc);
|
|
}
|
|
|
|
/**
|
|
* irq_udc_resume - Handle IRQ "UDC Resume"
|
|
* @udc: udc device
|
|
*/
|
|
static void irq_udc_resume(struct pxa_udc *udc)
|
|
{
|
|
udc_writel(udc, UDCISR1, UDCISR1_IRRU);
|
|
udc->stats.irqs_resume++;
|
|
|
|
if (udc->gadget.speed != USB_SPEED_UNKNOWN
|
|
&& udc->driver && udc->driver->resume)
|
|
udc->driver->resume(&udc->gadget);
|
|
}
|
|
|
|
/**
|
|
* irq_udc_reconfig - Handle IRQ "UDC Change Configuration"
|
|
* @udc: udc device
|
|
*/
|
|
static void irq_udc_reconfig(struct pxa_udc *udc)
|
|
{
|
|
unsigned config, interface, alternate, config_change;
|
|
u32 udccr = udc_readl(udc, UDCCR);
|
|
|
|
udc_writel(udc, UDCISR1, UDCISR1_IRCC);
|
|
udc->stats.irqs_reconfig++;
|
|
|
|
config = (udccr & UDCCR_ACN) >> UDCCR_ACN_S;
|
|
config_change = (config != udc->config);
|
|
pxa27x_change_configuration(udc, config);
|
|
|
|
interface = (udccr & UDCCR_AIN) >> UDCCR_AIN_S;
|
|
alternate = (udccr & UDCCR_AAISN) >> UDCCR_AAISN_S;
|
|
pxa27x_change_interface(udc, interface, alternate);
|
|
|
|
if (config_change)
|
|
update_pxa_ep_matches(udc);
|
|
udc_set_mask_UDCCR(udc, UDCCR_SMAC);
|
|
}
|
|
|
|
/**
|
|
* irq_udc_reset - Handle IRQ "UDC Reset"
|
|
* @udc: udc device
|
|
*/
|
|
static void irq_udc_reset(struct pxa_udc *udc)
|
|
{
|
|
u32 udccr = udc_readl(udc, UDCCR);
|
|
struct pxa_ep *ep = &udc->pxa_ep[0];
|
|
|
|
dev_info(udc->dev, "USB reset\n");
|
|
udc_writel(udc, UDCISR1, UDCISR1_IRRS);
|
|
udc->stats.irqs_reset++;
|
|
|
|
if ((udccr & UDCCR_UDA) == 0) {
|
|
dev_dbg(udc->dev, "USB reset start\n");
|
|
stop_activity(udc, udc->driver);
|
|
}
|
|
udc->gadget.speed = USB_SPEED_FULL;
|
|
memset(&udc->stats, 0, sizeof udc->stats);
|
|
|
|
nuke(ep, -EPROTO);
|
|
ep_write_UDCCSR(ep, UDCCSR0_FTF | UDCCSR0_OPC);
|
|
ep0_idle(udc);
|
|
}
|
|
|
|
/**
|
|
* pxa_udc_irq - Main irq handler
|
|
* @irq: irq number
|
|
* @_dev: udc device
|
|
*
|
|
* Handles all udc interrupts
|
|
*/
|
|
static irqreturn_t pxa_udc_irq(int irq, void *_dev)
|
|
{
|
|
struct pxa_udc *udc = _dev;
|
|
u32 udcisr0 = udc_readl(udc, UDCISR0);
|
|
u32 udcisr1 = udc_readl(udc, UDCISR1);
|
|
u32 udccr = udc_readl(udc, UDCCR);
|
|
u32 udcisr1_spec;
|
|
|
|
dev_vdbg(udc->dev, "Interrupt, UDCISR0:0x%08x, UDCISR1:0x%08x, "
|
|
"UDCCR:0x%08x\n", udcisr0, udcisr1, udccr);
|
|
|
|
udcisr1_spec = udcisr1 & 0xf8000000;
|
|
if (unlikely(udcisr1_spec & UDCISR1_IRSU))
|
|
irq_udc_suspend(udc);
|
|
if (unlikely(udcisr1_spec & UDCISR1_IRRU))
|
|
irq_udc_resume(udc);
|
|
if (unlikely(udcisr1_spec & UDCISR1_IRCC))
|
|
irq_udc_reconfig(udc);
|
|
if (unlikely(udcisr1_spec & UDCISR1_IRRS))
|
|
irq_udc_reset(udc);
|
|
|
|
if ((udcisr0 & UDCCISR0_EP_MASK) | (udcisr1 & UDCCISR1_EP_MASK))
|
|
irq_handle_data(irq, udc);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct pxa_udc memory = {
|
|
.gadget = {
|
|
.ops = &pxa_udc_ops,
|
|
.ep0 = &memory.udc_usb_ep[0].usb_ep,
|
|
.name = driver_name,
|
|
.dev = {
|
|
.init_name = "gadget",
|
|
},
|
|
},
|
|
|
|
.udc_usb_ep = {
|
|
USB_EP_CTRL,
|
|
USB_EP_OUT_BULK(1),
|
|
USB_EP_IN_BULK(2),
|
|
USB_EP_IN_ISO(3),
|
|
USB_EP_OUT_ISO(4),
|
|
USB_EP_IN_INT(5),
|
|
},
|
|
|
|
.pxa_ep = {
|
|
PXA_EP_CTRL,
|
|
/* Endpoints for gadget zero */
|
|
PXA_EP_OUT_BULK(1, 1, 3, 0, 0),
|
|
PXA_EP_IN_BULK(2, 2, 3, 0, 0),
|
|
/* Endpoints for ether gadget, file storage gadget */
|
|
PXA_EP_OUT_BULK(3, 1, 1, 0, 0),
|
|
PXA_EP_IN_BULK(4, 2, 1, 0, 0),
|
|
PXA_EP_IN_ISO(5, 3, 1, 0, 0),
|
|
PXA_EP_OUT_ISO(6, 4, 1, 0, 0),
|
|
PXA_EP_IN_INT(7, 5, 1, 0, 0),
|
|
/* Endpoints for RNDIS, serial */
|
|
PXA_EP_OUT_BULK(8, 1, 2, 0, 0),
|
|
PXA_EP_IN_BULK(9, 2, 2, 0, 0),
|
|
PXA_EP_IN_INT(10, 5, 2, 0, 0),
|
|
/*
|
|
* All the following endpoints are only for completion. They
|
|
* won't never work, as multiple interfaces are really broken on
|
|
* the pxa.
|
|
*/
|
|
PXA_EP_OUT_BULK(11, 1, 2, 1, 0),
|
|
PXA_EP_IN_BULK(12, 2, 2, 1, 0),
|
|
/* Endpoint for CDC Ether */
|
|
PXA_EP_OUT_BULK(13, 1, 1, 1, 1),
|
|
PXA_EP_IN_BULK(14, 2, 1, 1, 1),
|
|
}
|
|
};
|
|
|
|
/**
|
|
* pxa_udc_probe - probes the udc device
|
|
* @_dev: platform device
|
|
*
|
|
* Perform basic init : allocates udc clock, creates sysfs files, requests
|
|
* irq.
|
|
*/
|
|
static int __init pxa_udc_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *regs;
|
|
struct pxa_udc *udc = &memory;
|
|
int retval = 0, gpio;
|
|
|
|
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!regs)
|
|
return -ENXIO;
|
|
udc->irq = platform_get_irq(pdev, 0);
|
|
if (udc->irq < 0)
|
|
return udc->irq;
|
|
|
|
udc->dev = &pdev->dev;
|
|
udc->mach = pdev->dev.platform_data;
|
|
udc->transceiver = otg_get_transceiver();
|
|
|
|
gpio = udc->mach->gpio_pullup;
|
|
if (gpio_is_valid(gpio)) {
|
|
retval = gpio_request(gpio, "USB D+ pullup");
|
|
if (retval == 0)
|
|
gpio_direction_output(gpio,
|
|
udc->mach->gpio_pullup_inverted);
|
|
}
|
|
if (retval) {
|
|
dev_err(&pdev->dev, "Couldn't request gpio %d : %d\n",
|
|
gpio, retval);
|
|
return retval;
|
|
}
|
|
|
|
udc->clk = clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(udc->clk)) {
|
|
retval = PTR_ERR(udc->clk);
|
|
goto err_clk;
|
|
}
|
|
|
|
retval = -ENOMEM;
|
|
udc->regs = ioremap(regs->start, resource_size(regs));
|
|
if (!udc->regs) {
|
|
dev_err(&pdev->dev, "Unable to map UDC I/O memory\n");
|
|
goto err_map;
|
|
}
|
|
|
|
device_initialize(&udc->gadget.dev);
|
|
udc->gadget.dev.parent = &pdev->dev;
|
|
udc->gadget.dev.dma_mask = NULL;
|
|
udc->vbus_sensed = 0;
|
|
|
|
the_controller = udc;
|
|
platform_set_drvdata(pdev, udc);
|
|
udc_init_data(udc);
|
|
pxa_eps_setup(udc);
|
|
|
|
/* irq setup after old hardware state is cleaned up */
|
|
retval = request_irq(udc->irq, pxa_udc_irq,
|
|
IRQF_SHARED, driver_name, udc);
|
|
if (retval != 0) {
|
|
dev_err(udc->dev, "%s: can't get irq %i, err %d\n",
|
|
driver_name, IRQ_USB, retval);
|
|
goto err_irq;
|
|
}
|
|
|
|
pxa_init_debugfs(udc);
|
|
return 0;
|
|
err_irq:
|
|
iounmap(udc->regs);
|
|
err_map:
|
|
clk_put(udc->clk);
|
|
udc->clk = NULL;
|
|
err_clk:
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* pxa_udc_remove - removes the udc device driver
|
|
* @_dev: platform device
|
|
*/
|
|
static int __exit pxa_udc_remove(struct platform_device *_dev)
|
|
{
|
|
struct pxa_udc *udc = platform_get_drvdata(_dev);
|
|
int gpio = udc->mach->gpio_pullup;
|
|
|
|
usb_gadget_unregister_driver(udc->driver);
|
|
free_irq(udc->irq, udc);
|
|
pxa_cleanup_debugfs(udc);
|
|
if (gpio_is_valid(gpio))
|
|
gpio_free(gpio);
|
|
|
|
otg_put_transceiver(udc->transceiver);
|
|
|
|
udc->transceiver = NULL;
|
|
platform_set_drvdata(_dev, NULL);
|
|
the_controller = NULL;
|
|
clk_put(udc->clk);
|
|
iounmap(udc->regs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pxa_udc_shutdown(struct platform_device *_dev)
|
|
{
|
|
struct pxa_udc *udc = platform_get_drvdata(_dev);
|
|
|
|
if (udc_readl(udc, UDCCR) & UDCCR_UDE)
|
|
udc_disable(udc);
|
|
}
|
|
|
|
#ifdef CONFIG_PXA27x
|
|
extern void pxa27x_clear_otgph(void);
|
|
#else
|
|
#define pxa27x_clear_otgph() do {} while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM
|
|
/**
|
|
* pxa_udc_suspend - Suspend udc device
|
|
* @_dev: platform device
|
|
* @state: suspend state
|
|
*
|
|
* Suspends udc : saves configuration registers (UDCCR*), then disables the udc
|
|
* device.
|
|
*/
|
|
static int pxa_udc_suspend(struct platform_device *_dev, pm_message_t state)
|
|
{
|
|
int i;
|
|
struct pxa_udc *udc = platform_get_drvdata(_dev);
|
|
struct pxa_ep *ep;
|
|
|
|
ep = &udc->pxa_ep[0];
|
|
udc->udccsr0 = udc_ep_readl(ep, UDCCSR);
|
|
for (i = 1; i < NR_PXA_ENDPOINTS; i++) {
|
|
ep = &udc->pxa_ep[i];
|
|
ep->udccsr_value = udc_ep_readl(ep, UDCCSR);
|
|
ep->udccr_value = udc_ep_readl(ep, UDCCR);
|
|
ep_dbg(ep, "udccsr:0x%03x, udccr:0x%x\n",
|
|
ep->udccsr_value, ep->udccr_value);
|
|
}
|
|
|
|
udc_disable(udc);
|
|
udc->pullup_resume = udc->pullup_on;
|
|
dplus_pullup(udc, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pxa_udc_resume - Resume udc device
|
|
* @_dev: platform device
|
|
*
|
|
* Resumes udc : restores configuration registers (UDCCR*), then enables the udc
|
|
* device.
|
|
*/
|
|
static int pxa_udc_resume(struct platform_device *_dev)
|
|
{
|
|
int i;
|
|
struct pxa_udc *udc = platform_get_drvdata(_dev);
|
|
struct pxa_ep *ep;
|
|
|
|
ep = &udc->pxa_ep[0];
|
|
udc_ep_writel(ep, UDCCSR, udc->udccsr0 & (UDCCSR0_FST | UDCCSR0_DME));
|
|
for (i = 1; i < NR_PXA_ENDPOINTS; i++) {
|
|
ep = &udc->pxa_ep[i];
|
|
udc_ep_writel(ep, UDCCSR, ep->udccsr_value);
|
|
udc_ep_writel(ep, UDCCR, ep->udccr_value);
|
|
ep_dbg(ep, "udccsr:0x%03x, udccr:0x%x\n",
|
|
ep->udccsr_value, ep->udccr_value);
|
|
}
|
|
|
|
dplus_pullup(udc, udc->pullup_resume);
|
|
if (should_enable_udc(udc))
|
|
udc_enable(udc);
|
|
/*
|
|
* We do not handle OTG yet.
|
|
*
|
|
* OTGPH bit is set when sleep mode is entered.
|
|
* it indicates that OTG pad is retaining its state.
|
|
* Upon exit from sleep mode and before clearing OTGPH,
|
|
* Software must configure the USB OTG pad, UDC, and UHC
|
|
* to the state they were in before entering sleep mode.
|
|
*/
|
|
pxa27x_clear_otgph();
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* work with hotplug and coldplug */
|
|
MODULE_ALIAS("platform:pxa27x-udc");
|
|
|
|
static struct platform_driver udc_driver = {
|
|
.driver = {
|
|
.name = "pxa27x-udc",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.remove = __exit_p(pxa_udc_remove),
|
|
.shutdown = pxa_udc_shutdown,
|
|
#ifdef CONFIG_PM
|
|
.suspend = pxa_udc_suspend,
|
|
.resume = pxa_udc_resume
|
|
#endif
|
|
};
|
|
|
|
static int __init udc_init(void)
|
|
{
|
|
if (!cpu_is_pxa27x() && !cpu_is_pxa3xx())
|
|
return -ENODEV;
|
|
|
|
printk(KERN_INFO "%s: version %s\n", driver_name, DRIVER_VERSION);
|
|
return platform_driver_probe(&udc_driver, pxa_udc_probe);
|
|
}
|
|
module_init(udc_init);
|
|
|
|
|
|
static void __exit udc_exit(void)
|
|
{
|
|
platform_driver_unregister(&udc_driver);
|
|
}
|
|
module_exit(udc_exit);
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_AUTHOR("Robert Jarzmik");
|
|
MODULE_LICENSE("GPL");
|