3c2d636a1c
that has already being done by udc-core.c. It's unnecessary and might cause issues with some gadget drivers. Tested: Ajay Kumar Gupta <ajay.gupta@ti.com> Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2221 lines
58 KiB
C
2221 lines
58 KiB
C
/*
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* MUSB OTG driver peripheral support
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*
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* Copyright 2005 Mentor Graphics Corporation
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* Copyright (C) 2005-2006 by Texas Instruments
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* Copyright (C) 2006-2007 Nokia Corporation
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* Copyright (C) 2009 MontaVista Software, Inc. <source@mvista.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/timer.h>
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#include <linux/module.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/moduleparam.h>
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#include <linux/stat.h>
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#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include "musb_core.h"
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/* MUSB PERIPHERAL status 3-mar-2006:
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*
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* - EP0 seems solid. It passes both USBCV and usbtest control cases.
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* Minor glitches:
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*
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* + remote wakeup to Linux hosts work, but saw USBCV failures;
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* in one test run (operator error?)
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* + endpoint halt tests -- in both usbtest and usbcv -- seem
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* to break when dma is enabled ... is something wrongly
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* clearing SENDSTALL?
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*
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* - Mass storage behaved ok when last tested. Network traffic patterns
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* (with lots of short transfers etc) need retesting; they turn up the
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* worst cases of the DMA, since short packets are typical but are not
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* required.
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*
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* - TX/IN
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* + both pio and dma behave in with network and g_zero tests
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* + no cppi throughput issues other than no-hw-queueing
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* + failed with FLAT_REG (DaVinci)
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* + seems to behave with double buffering, PIO -and- CPPI
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* + with gadgetfs + AIO, requests got lost?
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*
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* - RX/OUT
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* + both pio and dma behave in with network and g_zero tests
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* + dma is slow in typical case (short_not_ok is clear)
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* + double buffering ok with PIO
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* + double buffering *FAILS* with CPPI, wrong data bytes sometimes
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* + request lossage observed with gadgetfs
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*
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* - ISO not tested ... might work, but only weakly isochronous
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*
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* - Gadget driver disabling of softconnect during bind() is ignored; so
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* drivers can't hold off host requests until userspace is ready.
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* (Workaround: they can turn it off later.)
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*
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* - PORTABILITY (assumes PIO works):
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* + DaVinci, basically works with cppi dma
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* + OMAP 2430, ditto with mentor dma
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* + TUSB 6010, platform-specific dma in the works
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*/
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/* ----------------------------------------------------------------------- */
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#define is_buffer_mapped(req) (is_dma_capable() && \
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(req->map_state != UN_MAPPED))
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/* Maps the buffer to dma */
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static inline void map_dma_buffer(struct musb_request *request,
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struct musb *musb, struct musb_ep *musb_ep)
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{
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int compatible = true;
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struct dma_controller *dma = musb->dma_controller;
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request->map_state = UN_MAPPED;
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if (!is_dma_capable() || !musb_ep->dma)
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return;
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/* Check if DMA engine can handle this request.
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* DMA code must reject the USB request explicitly.
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* Default behaviour is to map the request.
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*/
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if (dma->is_compatible)
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compatible = dma->is_compatible(musb_ep->dma,
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musb_ep->packet_sz, request->request.buf,
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request->request.length);
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if (!compatible)
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return;
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if (request->request.dma == DMA_ADDR_INVALID) {
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request->request.dma = dma_map_single(
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musb->controller,
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request->request.buf,
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request->request.length,
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request->tx
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? DMA_TO_DEVICE
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: DMA_FROM_DEVICE);
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request->map_state = MUSB_MAPPED;
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} else {
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dma_sync_single_for_device(musb->controller,
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request->request.dma,
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request->request.length,
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request->tx
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? DMA_TO_DEVICE
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: DMA_FROM_DEVICE);
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request->map_state = PRE_MAPPED;
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}
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}
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/* Unmap the buffer from dma and maps it back to cpu */
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static inline void unmap_dma_buffer(struct musb_request *request,
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struct musb *musb)
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{
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if (!is_buffer_mapped(request))
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return;
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if (request->request.dma == DMA_ADDR_INVALID) {
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dev_vdbg(musb->controller,
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"not unmapping a never mapped buffer\n");
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return;
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}
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if (request->map_state == MUSB_MAPPED) {
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dma_unmap_single(musb->controller,
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request->request.dma,
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request->request.length,
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request->tx
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? DMA_TO_DEVICE
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: DMA_FROM_DEVICE);
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request->request.dma = DMA_ADDR_INVALID;
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} else { /* PRE_MAPPED */
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dma_sync_single_for_cpu(musb->controller,
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request->request.dma,
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request->request.length,
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request->tx
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? DMA_TO_DEVICE
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: DMA_FROM_DEVICE);
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}
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request->map_state = UN_MAPPED;
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}
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/*
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* Immediately complete a request.
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*
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* @param request the request to complete
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* @param status the status to complete the request with
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* Context: controller locked, IRQs blocked.
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*/
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void musb_g_giveback(
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struct musb_ep *ep,
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struct usb_request *request,
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int status)
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__releases(ep->musb->lock)
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__acquires(ep->musb->lock)
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{
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struct musb_request *req;
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struct musb *musb;
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int busy = ep->busy;
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req = to_musb_request(request);
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list_del(&req->list);
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if (req->request.status == -EINPROGRESS)
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req->request.status = status;
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musb = req->musb;
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ep->busy = 1;
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spin_unlock(&musb->lock);
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unmap_dma_buffer(req, musb);
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if (request->status == 0)
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dev_dbg(musb->controller, "%s done request %p, %d/%d\n",
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ep->end_point.name, request,
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req->request.actual, req->request.length);
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else
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dev_dbg(musb->controller, "%s request %p, %d/%d fault %d\n",
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ep->end_point.name, request,
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req->request.actual, req->request.length,
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request->status);
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req->request.complete(&req->ep->end_point, &req->request);
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spin_lock(&musb->lock);
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ep->busy = busy;
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}
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/* ----------------------------------------------------------------------- */
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/*
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* Abort requests queued to an endpoint using the status. Synchronous.
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* caller locked controller and blocked irqs, and selected this ep.
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*/
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static void nuke(struct musb_ep *ep, const int status)
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{
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struct musb *musb = ep->musb;
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struct musb_request *req = NULL;
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void __iomem *epio = ep->musb->endpoints[ep->current_epnum].regs;
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ep->busy = 1;
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if (is_dma_capable() && ep->dma) {
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struct dma_controller *c = ep->musb->dma_controller;
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int value;
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if (ep->is_in) {
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/*
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* The programming guide says that we must not clear
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* the DMAMODE bit before DMAENAB, so we only
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* clear it in the second write...
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*/
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musb_writew(epio, MUSB_TXCSR,
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MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO);
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musb_writew(epio, MUSB_TXCSR,
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0 | MUSB_TXCSR_FLUSHFIFO);
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} else {
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musb_writew(epio, MUSB_RXCSR,
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0 | MUSB_RXCSR_FLUSHFIFO);
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musb_writew(epio, MUSB_RXCSR,
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0 | MUSB_RXCSR_FLUSHFIFO);
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}
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value = c->channel_abort(ep->dma);
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dev_dbg(musb->controller, "%s: abort DMA --> %d\n",
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ep->name, value);
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c->channel_release(ep->dma);
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ep->dma = NULL;
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}
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while (!list_empty(&ep->req_list)) {
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req = list_first_entry(&ep->req_list, struct musb_request, list);
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musb_g_giveback(ep, &req->request, status);
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}
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}
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/* ----------------------------------------------------------------------- */
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/* Data transfers - pure PIO, pure DMA, or mixed mode */
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/*
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* This assumes the separate CPPI engine is responding to DMA requests
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* from the usb core ... sequenced a bit differently from mentor dma.
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*/
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static inline int max_ep_writesize(struct musb *musb, struct musb_ep *ep)
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{
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if (can_bulk_split(musb, ep->type))
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return ep->hw_ep->max_packet_sz_tx;
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else
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return ep->packet_sz;
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}
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#ifdef CONFIG_USB_INVENTRA_DMA
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/* Peripheral tx (IN) using Mentor DMA works as follows:
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Only mode 0 is used for transfers <= wPktSize,
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mode 1 is used for larger transfers,
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One of the following happens:
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- Host sends IN token which causes an endpoint interrupt
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-> TxAvail
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-> if DMA is currently busy, exit.
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-> if queue is non-empty, txstate().
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- Request is queued by the gadget driver.
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-> if queue was previously empty, txstate()
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txstate()
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-> start
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/\ -> setup DMA
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| (data is transferred to the FIFO, then sent out when
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| IN token(s) are recd from Host.
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| -> DMA interrupt on completion
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| calls TxAvail.
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| -> stop DMA, ~DMAENAB,
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| -> set TxPktRdy for last short pkt or zlp
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| -> Complete Request
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| -> Continue next request (call txstate)
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|___________________________________|
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* Non-Mentor DMA engines can of course work differently, such as by
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* upleveling from irq-per-packet to irq-per-buffer.
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*/
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#endif
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/*
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* An endpoint is transmitting data. This can be called either from
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* the IRQ routine or from ep.queue() to kickstart a request on an
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* endpoint.
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*
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* Context: controller locked, IRQs blocked, endpoint selected
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*/
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static void txstate(struct musb *musb, struct musb_request *req)
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{
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u8 epnum = req->epnum;
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struct musb_ep *musb_ep;
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void __iomem *epio = musb->endpoints[epnum].regs;
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struct usb_request *request;
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u16 fifo_count = 0, csr;
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int use_dma = 0;
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musb_ep = req->ep;
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/* we shouldn't get here while DMA is active ... but we do ... */
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if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
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dev_dbg(musb->controller, "dma pending...\n");
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return;
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}
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/* read TXCSR before */
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csr = musb_readw(epio, MUSB_TXCSR);
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request = &req->request;
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fifo_count = min(max_ep_writesize(musb, musb_ep),
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(int)(request->length - request->actual));
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if (csr & MUSB_TXCSR_TXPKTRDY) {
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dev_dbg(musb->controller, "%s old packet still ready , txcsr %03x\n",
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musb_ep->end_point.name, csr);
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return;
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}
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if (csr & MUSB_TXCSR_P_SENDSTALL) {
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dev_dbg(musb->controller, "%s stalling, txcsr %03x\n",
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musb_ep->end_point.name, csr);
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return;
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}
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dev_dbg(musb->controller, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x\n",
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epnum, musb_ep->packet_sz, fifo_count,
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csr);
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#ifndef CONFIG_MUSB_PIO_ONLY
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if (is_buffer_mapped(req)) {
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struct dma_controller *c = musb->dma_controller;
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size_t request_size;
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/* setup DMA, then program endpoint CSR */
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request_size = min_t(size_t, request->length - request->actual,
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musb_ep->dma->max_len);
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use_dma = (request->dma != DMA_ADDR_INVALID);
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/* MUSB_TXCSR_P_ISO is still set correctly */
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#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
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{
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if (request_size < musb_ep->packet_sz)
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musb_ep->dma->desired_mode = 0;
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else
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musb_ep->dma->desired_mode = 1;
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use_dma = use_dma && c->channel_program(
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musb_ep->dma, musb_ep->packet_sz,
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musb_ep->dma->desired_mode,
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request->dma + request->actual, request_size);
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if (use_dma) {
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if (musb_ep->dma->desired_mode == 0) {
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/*
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* We must not clear the DMAMODE bit
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* before the DMAENAB bit -- and the
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* latter doesn't always get cleared
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* before we get here...
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*/
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csr &= ~(MUSB_TXCSR_AUTOSET
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| MUSB_TXCSR_DMAENAB);
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musb_writew(epio, MUSB_TXCSR, csr
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| MUSB_TXCSR_P_WZC_BITS);
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csr &= ~MUSB_TXCSR_DMAMODE;
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csr |= (MUSB_TXCSR_DMAENAB |
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MUSB_TXCSR_MODE);
|
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/* against programming guide */
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} else {
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csr |= (MUSB_TXCSR_DMAENAB
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| MUSB_TXCSR_DMAMODE
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| MUSB_TXCSR_MODE);
|
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if (!musb_ep->hb_mult)
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csr |= MUSB_TXCSR_AUTOSET;
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}
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csr &= ~MUSB_TXCSR_P_UNDERRUN;
|
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|
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musb_writew(epio, MUSB_TXCSR, csr);
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}
|
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}
|
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|
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#elif defined(CONFIG_USB_TI_CPPI_DMA)
|
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/* program endpoint CSR first, then setup DMA */
|
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csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
|
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csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE |
|
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MUSB_TXCSR_MODE;
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musb_writew(epio, MUSB_TXCSR,
|
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(MUSB_TXCSR_P_WZC_BITS & ~MUSB_TXCSR_P_UNDERRUN)
|
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| csr);
|
|
|
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/* ensure writebuffer is empty */
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csr = musb_readw(epio, MUSB_TXCSR);
|
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|
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/* NOTE host side sets DMAENAB later than this; both are
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* OK since the transfer dma glue (between CPPI and Mentor
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* fifos) just tells CPPI it could start. Data only moves
|
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* to the USB TX fifo when both fifos are ready.
|
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*/
|
|
|
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/* "mode" is irrelevant here; handle terminating ZLPs like
|
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* PIO does, since the hardware RNDIS mode seems unreliable
|
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* except for the last-packet-is-already-short case.
|
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*/
|
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use_dma = use_dma && c->channel_program(
|
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musb_ep->dma, musb_ep->packet_sz,
|
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0,
|
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request->dma + request->actual,
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request_size);
|
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if (!use_dma) {
|
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c->channel_release(musb_ep->dma);
|
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musb_ep->dma = NULL;
|
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csr &= ~MUSB_TXCSR_DMAENAB;
|
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musb_writew(epio, MUSB_TXCSR, csr);
|
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/* invariant: prequest->buf is non-null */
|
|
}
|
|
#elif defined(CONFIG_USB_TUSB_OMAP_DMA)
|
|
use_dma = use_dma && c->channel_program(
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musb_ep->dma, musb_ep->packet_sz,
|
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request->zero,
|
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request->dma + request->actual,
|
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request_size);
|
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#endif
|
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}
|
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#endif
|
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|
|
if (!use_dma) {
|
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/*
|
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* Unmap the dma buffer back to cpu if dma channel
|
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* programming fails
|
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*/
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unmap_dma_buffer(req, musb);
|
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|
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musb_write_fifo(musb_ep->hw_ep, fifo_count,
|
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(u8 *) (request->buf + request->actual));
|
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request->actual += fifo_count;
|
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csr |= MUSB_TXCSR_TXPKTRDY;
|
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csr &= ~MUSB_TXCSR_P_UNDERRUN;
|
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musb_writew(epio, MUSB_TXCSR, csr);
|
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}
|
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|
|
/* host may already have the data when this message shows... */
|
|
dev_dbg(musb->controller, "%s TX/IN %s len %d/%d, txcsr %04x, fifo %d/%d\n",
|
|
musb_ep->end_point.name, use_dma ? "dma" : "pio",
|
|
request->actual, request->length,
|
|
musb_readw(epio, MUSB_TXCSR),
|
|
fifo_count,
|
|
musb_readw(epio, MUSB_TXMAXP));
|
|
}
|
|
|
|
/*
|
|
* FIFO state update (e.g. data ready).
|
|
* Called from IRQ, with controller locked.
|
|
*/
|
|
void musb_g_tx(struct musb *musb, u8 epnum)
|
|
{
|
|
u16 csr;
|
|
struct musb_request *req;
|
|
struct usb_request *request;
|
|
u8 __iomem *mbase = musb->mregs;
|
|
struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_in;
|
|
void __iomem *epio = musb->endpoints[epnum].regs;
|
|
struct dma_channel *dma;
|
|
|
|
musb_ep_select(mbase, epnum);
|
|
req = next_request(musb_ep);
|
|
request = &req->request;
|
|
|
|
csr = musb_readw(epio, MUSB_TXCSR);
|
|
dev_dbg(musb->controller, "<== %s, txcsr %04x\n", musb_ep->end_point.name, csr);
|
|
|
|
dma = is_dma_capable() ? musb_ep->dma : NULL;
|
|
|
|
/*
|
|
* REVISIT: for high bandwidth, MUSB_TXCSR_P_INCOMPTX
|
|
* probably rates reporting as a host error.
|
|
*/
|
|
if (csr & MUSB_TXCSR_P_SENTSTALL) {
|
|
csr |= MUSB_TXCSR_P_WZC_BITS;
|
|
csr &= ~MUSB_TXCSR_P_SENTSTALL;
|
|
musb_writew(epio, MUSB_TXCSR, csr);
|
|
return;
|
|
}
|
|
|
|
if (csr & MUSB_TXCSR_P_UNDERRUN) {
|
|
/* We NAKed, no big deal... little reason to care. */
|
|
csr |= MUSB_TXCSR_P_WZC_BITS;
|
|
csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
|
|
musb_writew(epio, MUSB_TXCSR, csr);
|
|
dev_vdbg(musb->controller, "underrun on ep%d, req %p\n",
|
|
epnum, request);
|
|
}
|
|
|
|
if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
|
|
/*
|
|
* SHOULD NOT HAPPEN... has with CPPI though, after
|
|
* changing SENDSTALL (and other cases); harmless?
|
|
*/
|
|
dev_dbg(musb->controller, "%s dma still busy?\n", musb_ep->end_point.name);
|
|
return;
|
|
}
|
|
|
|
if (request) {
|
|
u8 is_dma = 0;
|
|
|
|
if (dma && (csr & MUSB_TXCSR_DMAENAB)) {
|
|
is_dma = 1;
|
|
csr |= MUSB_TXCSR_P_WZC_BITS;
|
|
csr &= ~(MUSB_TXCSR_DMAENAB | MUSB_TXCSR_P_UNDERRUN |
|
|
MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_AUTOSET);
|
|
musb_writew(epio, MUSB_TXCSR, csr);
|
|
/* Ensure writebuffer is empty. */
|
|
csr = musb_readw(epio, MUSB_TXCSR);
|
|
request->actual += musb_ep->dma->actual_len;
|
|
dev_dbg(musb->controller, "TXCSR%d %04x, DMA off, len %zu, req %p\n",
|
|
epnum, csr, musb_ep->dma->actual_len, request);
|
|
}
|
|
|
|
/*
|
|
* First, maybe a terminating short packet. Some DMA
|
|
* engines might handle this by themselves.
|
|
*/
|
|
if ((request->zero && request->length
|
|
&& (request->length % musb_ep->packet_sz == 0)
|
|
&& (request->actual == request->length))
|
|
#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
|
|
|| (is_dma && (!dma->desired_mode ||
|
|
(request->actual &
|
|
(musb_ep->packet_sz - 1))))
|
|
#endif
|
|
) {
|
|
/*
|
|
* On DMA completion, FIFO may not be
|
|
* available yet...
|
|
*/
|
|
if (csr & MUSB_TXCSR_TXPKTRDY)
|
|
return;
|
|
|
|
dev_dbg(musb->controller, "sending zero pkt\n");
|
|
musb_writew(epio, MUSB_TXCSR, MUSB_TXCSR_MODE
|
|
| MUSB_TXCSR_TXPKTRDY);
|
|
request->zero = 0;
|
|
}
|
|
|
|
if (request->actual == request->length) {
|
|
musb_g_giveback(musb_ep, request, 0);
|
|
req = musb_ep->desc ? next_request(musb_ep) : NULL;
|
|
if (!req) {
|
|
dev_dbg(musb->controller, "%s idle now\n",
|
|
musb_ep->end_point.name);
|
|
return;
|
|
}
|
|
}
|
|
|
|
txstate(musb, req);
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------ */
|
|
|
|
#ifdef CONFIG_USB_INVENTRA_DMA
|
|
|
|
/* Peripheral rx (OUT) using Mentor DMA works as follows:
|
|
- Only mode 0 is used.
|
|
|
|
- Request is queued by the gadget class driver.
|
|
-> if queue was previously empty, rxstate()
|
|
|
|
- Host sends OUT token which causes an endpoint interrupt
|
|
/\ -> RxReady
|
|
| -> if request queued, call rxstate
|
|
| /\ -> setup DMA
|
|
| | -> DMA interrupt on completion
|
|
| | -> RxReady
|
|
| | -> stop DMA
|
|
| | -> ack the read
|
|
| | -> if data recd = max expected
|
|
| | by the request, or host
|
|
| | sent a short packet,
|
|
| | complete the request,
|
|
| | and start the next one.
|
|
| |_____________________________________|
|
|
| else just wait for the host
|
|
| to send the next OUT token.
|
|
|__________________________________________________|
|
|
|
|
* Non-Mentor DMA engines can of course work differently.
|
|
*/
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Context: controller locked, IRQs blocked, endpoint selected
|
|
*/
|
|
static void rxstate(struct musb *musb, struct musb_request *req)
|
|
{
|
|
const u8 epnum = req->epnum;
|
|
struct usb_request *request = &req->request;
|
|
struct musb_ep *musb_ep;
|
|
void __iomem *epio = musb->endpoints[epnum].regs;
|
|
unsigned fifo_count = 0;
|
|
u16 len;
|
|
u16 csr = musb_readw(epio, MUSB_RXCSR);
|
|
struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
|
|
u8 use_mode_1;
|
|
|
|
if (hw_ep->is_shared_fifo)
|
|
musb_ep = &hw_ep->ep_in;
|
|
else
|
|
musb_ep = &hw_ep->ep_out;
|
|
|
|
len = musb_ep->packet_sz;
|
|
|
|
/* We shouldn't get here while DMA is active, but we do... */
|
|
if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
|
|
dev_dbg(musb->controller, "DMA pending...\n");
|
|
return;
|
|
}
|
|
|
|
if (csr & MUSB_RXCSR_P_SENDSTALL) {
|
|
dev_dbg(musb->controller, "%s stalling, RXCSR %04x\n",
|
|
musb_ep->end_point.name, csr);
|
|
return;
|
|
}
|
|
|
|
if (is_cppi_enabled() && is_buffer_mapped(req)) {
|
|
struct dma_controller *c = musb->dma_controller;
|
|
struct dma_channel *channel = musb_ep->dma;
|
|
|
|
/* NOTE: CPPI won't actually stop advancing the DMA
|
|
* queue after short packet transfers, so this is almost
|
|
* always going to run as IRQ-per-packet DMA so that
|
|
* faults will be handled correctly.
|
|
*/
|
|
if (c->channel_program(channel,
|
|
musb_ep->packet_sz,
|
|
!request->short_not_ok,
|
|
request->dma + request->actual,
|
|
request->length - request->actual)) {
|
|
|
|
/* make sure that if an rxpkt arrived after the irq,
|
|
* the cppi engine will be ready to take it as soon
|
|
* as DMA is enabled
|
|
*/
|
|
csr &= ~(MUSB_RXCSR_AUTOCLEAR
|
|
| MUSB_RXCSR_DMAMODE);
|
|
csr |= MUSB_RXCSR_DMAENAB | MUSB_RXCSR_P_WZC_BITS;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (csr & MUSB_RXCSR_RXPKTRDY) {
|
|
len = musb_readw(epio, MUSB_RXCOUNT);
|
|
|
|
/*
|
|
* Enable Mode 1 on RX transfers only when short_not_ok flag
|
|
* is set. Currently short_not_ok flag is set only from
|
|
* file_storage and f_mass_storage drivers
|
|
*/
|
|
|
|
if (request->short_not_ok && len == musb_ep->packet_sz)
|
|
use_mode_1 = 1;
|
|
else
|
|
use_mode_1 = 0;
|
|
|
|
if (request->actual < request->length) {
|
|
#ifdef CONFIG_USB_INVENTRA_DMA
|
|
if (is_buffer_mapped(req)) {
|
|
struct dma_controller *c;
|
|
struct dma_channel *channel;
|
|
int use_dma = 0;
|
|
|
|
c = musb->dma_controller;
|
|
channel = musb_ep->dma;
|
|
|
|
/* We use DMA Req mode 0 in rx_csr, and DMA controller operates in
|
|
* mode 0 only. So we do not get endpoint interrupts due to DMA
|
|
* completion. We only get interrupts from DMA controller.
|
|
*
|
|
* We could operate in DMA mode 1 if we knew the size of the tranfer
|
|
* in advance. For mass storage class, request->length = what the host
|
|
* sends, so that'd work. But for pretty much everything else,
|
|
* request->length is routinely more than what the host sends. For
|
|
* most these gadgets, end of is signified either by a short packet,
|
|
* or filling the last byte of the buffer. (Sending extra data in
|
|
* that last pckate should trigger an overflow fault.) But in mode 1,
|
|
* we don't get DMA completion interrupt for short packets.
|
|
*
|
|
* Theoretically, we could enable DMAReq irq (MUSB_RXCSR_DMAMODE = 1),
|
|
* to get endpoint interrupt on every DMA req, but that didn't seem
|
|
* to work reliably.
|
|
*
|
|
* REVISIT an updated g_file_storage can set req->short_not_ok, which
|
|
* then becomes usable as a runtime "use mode 1" hint...
|
|
*/
|
|
|
|
/* Experimental: Mode1 works with mass storage use cases */
|
|
if (use_mode_1) {
|
|
csr |= MUSB_RXCSR_AUTOCLEAR;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
csr |= MUSB_RXCSR_DMAENAB;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
|
|
/*
|
|
* this special sequence (enabling and then
|
|
* disabling MUSB_RXCSR_DMAMODE) is required
|
|
* to get DMAReq to activate
|
|
*/
|
|
musb_writew(epio, MUSB_RXCSR,
|
|
csr | MUSB_RXCSR_DMAMODE);
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
|
|
} else {
|
|
if (!musb_ep->hb_mult &&
|
|
musb_ep->hw_ep->rx_double_buffered)
|
|
csr |= MUSB_RXCSR_AUTOCLEAR;
|
|
csr |= MUSB_RXCSR_DMAENAB;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
}
|
|
|
|
if (request->actual < request->length) {
|
|
int transfer_size = 0;
|
|
if (use_mode_1) {
|
|
transfer_size = min(request->length - request->actual,
|
|
channel->max_len);
|
|
musb_ep->dma->desired_mode = 1;
|
|
} else {
|
|
transfer_size = min(request->length - request->actual,
|
|
(unsigned)len);
|
|
musb_ep->dma->desired_mode = 0;
|
|
}
|
|
|
|
use_dma = c->channel_program(
|
|
channel,
|
|
musb_ep->packet_sz,
|
|
channel->desired_mode,
|
|
request->dma
|
|
+ request->actual,
|
|
transfer_size);
|
|
}
|
|
|
|
if (use_dma)
|
|
return;
|
|
}
|
|
#elif defined(CONFIG_USB_UX500_DMA)
|
|
if ((is_buffer_mapped(req)) &&
|
|
(request->actual < request->length)) {
|
|
|
|
struct dma_controller *c;
|
|
struct dma_channel *channel;
|
|
int transfer_size = 0;
|
|
|
|
c = musb->dma_controller;
|
|
channel = musb_ep->dma;
|
|
|
|
/* In case first packet is short */
|
|
if (len < musb_ep->packet_sz)
|
|
transfer_size = len;
|
|
else if (request->short_not_ok)
|
|
transfer_size = min(request->length -
|
|
request->actual,
|
|
channel->max_len);
|
|
else
|
|
transfer_size = min(request->length -
|
|
request->actual,
|
|
(unsigned)len);
|
|
|
|
csr &= ~MUSB_RXCSR_DMAMODE;
|
|
csr |= (MUSB_RXCSR_DMAENAB |
|
|
MUSB_RXCSR_AUTOCLEAR);
|
|
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
|
|
if (transfer_size <= musb_ep->packet_sz) {
|
|
musb_ep->dma->desired_mode = 0;
|
|
} else {
|
|
musb_ep->dma->desired_mode = 1;
|
|
/* Mode must be set after DMAENAB */
|
|
csr |= MUSB_RXCSR_DMAMODE;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
}
|
|
|
|
if (c->channel_program(channel,
|
|
musb_ep->packet_sz,
|
|
channel->desired_mode,
|
|
request->dma
|
|
+ request->actual,
|
|
transfer_size))
|
|
|
|
return;
|
|
}
|
|
#endif /* Mentor's DMA */
|
|
|
|
fifo_count = request->length - request->actual;
|
|
dev_dbg(musb->controller, "%s OUT/RX pio fifo %d/%d, maxpacket %d\n",
|
|
musb_ep->end_point.name,
|
|
len, fifo_count,
|
|
musb_ep->packet_sz);
|
|
|
|
fifo_count = min_t(unsigned, len, fifo_count);
|
|
|
|
#ifdef CONFIG_USB_TUSB_OMAP_DMA
|
|
if (tusb_dma_omap() && is_buffer_mapped(req)) {
|
|
struct dma_controller *c = musb->dma_controller;
|
|
struct dma_channel *channel = musb_ep->dma;
|
|
u32 dma_addr = request->dma + request->actual;
|
|
int ret;
|
|
|
|
ret = c->channel_program(channel,
|
|
musb_ep->packet_sz,
|
|
channel->desired_mode,
|
|
dma_addr,
|
|
fifo_count);
|
|
if (ret)
|
|
return;
|
|
}
|
|
#endif
|
|
/*
|
|
* Unmap the dma buffer back to cpu if dma channel
|
|
* programming fails. This buffer is mapped if the
|
|
* channel allocation is successful
|
|
*/
|
|
if (is_buffer_mapped(req)) {
|
|
unmap_dma_buffer(req, musb);
|
|
|
|
/*
|
|
* Clear DMAENAB and AUTOCLEAR for the
|
|
* PIO mode transfer
|
|
*/
|
|
csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR);
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
}
|
|
|
|
musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *)
|
|
(request->buf + request->actual));
|
|
request->actual += fifo_count;
|
|
|
|
/* REVISIT if we left anything in the fifo, flush
|
|
* it and report -EOVERFLOW
|
|
*/
|
|
|
|
/* ack the read! */
|
|
csr |= MUSB_RXCSR_P_WZC_BITS;
|
|
csr &= ~MUSB_RXCSR_RXPKTRDY;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
}
|
|
}
|
|
|
|
/* reach the end or short packet detected */
|
|
if (request->actual == request->length || len < musb_ep->packet_sz)
|
|
musb_g_giveback(musb_ep, request, 0);
|
|
}
|
|
|
|
/*
|
|
* Data ready for a request; called from IRQ
|
|
*/
|
|
void musb_g_rx(struct musb *musb, u8 epnum)
|
|
{
|
|
u16 csr;
|
|
struct musb_request *req;
|
|
struct usb_request *request;
|
|
void __iomem *mbase = musb->mregs;
|
|
struct musb_ep *musb_ep;
|
|
void __iomem *epio = musb->endpoints[epnum].regs;
|
|
struct dma_channel *dma;
|
|
struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
|
|
|
|
if (hw_ep->is_shared_fifo)
|
|
musb_ep = &hw_ep->ep_in;
|
|
else
|
|
musb_ep = &hw_ep->ep_out;
|
|
|
|
musb_ep_select(mbase, epnum);
|
|
|
|
req = next_request(musb_ep);
|
|
if (!req)
|
|
return;
|
|
|
|
request = &req->request;
|
|
|
|
csr = musb_readw(epio, MUSB_RXCSR);
|
|
dma = is_dma_capable() ? musb_ep->dma : NULL;
|
|
|
|
dev_dbg(musb->controller, "<== %s, rxcsr %04x%s %p\n", musb_ep->end_point.name,
|
|
csr, dma ? " (dma)" : "", request);
|
|
|
|
if (csr & MUSB_RXCSR_P_SENTSTALL) {
|
|
csr |= MUSB_RXCSR_P_WZC_BITS;
|
|
csr &= ~MUSB_RXCSR_P_SENTSTALL;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
return;
|
|
}
|
|
|
|
if (csr & MUSB_RXCSR_P_OVERRUN) {
|
|
/* csr |= MUSB_RXCSR_P_WZC_BITS; */
|
|
csr &= ~MUSB_RXCSR_P_OVERRUN;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
|
|
dev_dbg(musb->controller, "%s iso overrun on %p\n", musb_ep->name, request);
|
|
if (request->status == -EINPROGRESS)
|
|
request->status = -EOVERFLOW;
|
|
}
|
|
if (csr & MUSB_RXCSR_INCOMPRX) {
|
|
/* REVISIT not necessarily an error */
|
|
dev_dbg(musb->controller, "%s, incomprx\n", musb_ep->end_point.name);
|
|
}
|
|
|
|
if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
|
|
/* "should not happen"; likely RXPKTRDY pending for DMA */
|
|
dev_dbg(musb->controller, "%s busy, csr %04x\n",
|
|
musb_ep->end_point.name, csr);
|
|
return;
|
|
}
|
|
|
|
if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
|
|
csr &= ~(MUSB_RXCSR_AUTOCLEAR
|
|
| MUSB_RXCSR_DMAENAB
|
|
| MUSB_RXCSR_DMAMODE);
|
|
musb_writew(epio, MUSB_RXCSR,
|
|
MUSB_RXCSR_P_WZC_BITS | csr);
|
|
|
|
request->actual += musb_ep->dma->actual_len;
|
|
|
|
dev_dbg(musb->controller, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n",
|
|
epnum, csr,
|
|
musb_readw(epio, MUSB_RXCSR),
|
|
musb_ep->dma->actual_len, request);
|
|
|
|
#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
|
|
defined(CONFIG_USB_UX500_DMA)
|
|
/* Autoclear doesn't clear RxPktRdy for short packets */
|
|
if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered)
|
|
|| (dma->actual_len
|
|
& (musb_ep->packet_sz - 1))) {
|
|
/* ack the read! */
|
|
csr &= ~MUSB_RXCSR_RXPKTRDY;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
}
|
|
|
|
/* incomplete, and not short? wait for next IN packet */
|
|
if ((request->actual < request->length)
|
|
&& (musb_ep->dma->actual_len
|
|
== musb_ep->packet_sz)) {
|
|
/* In double buffer case, continue to unload fifo if
|
|
* there is Rx packet in FIFO.
|
|
**/
|
|
csr = musb_readw(epio, MUSB_RXCSR);
|
|
if ((csr & MUSB_RXCSR_RXPKTRDY) &&
|
|
hw_ep->rx_double_buffered)
|
|
goto exit;
|
|
return;
|
|
}
|
|
#endif
|
|
musb_g_giveback(musb_ep, request, 0);
|
|
|
|
req = next_request(musb_ep);
|
|
if (!req)
|
|
return;
|
|
}
|
|
#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
|
|
defined(CONFIG_USB_UX500_DMA)
|
|
exit:
|
|
#endif
|
|
/* Analyze request */
|
|
rxstate(musb, req);
|
|
}
|
|
|
|
/* ------------------------------------------------------------ */
|
|
|
|
static int musb_gadget_enable(struct usb_ep *ep,
|
|
const struct usb_endpoint_descriptor *desc)
|
|
{
|
|
unsigned long flags;
|
|
struct musb_ep *musb_ep;
|
|
struct musb_hw_ep *hw_ep;
|
|
void __iomem *regs;
|
|
struct musb *musb;
|
|
void __iomem *mbase;
|
|
u8 epnum;
|
|
u16 csr;
|
|
unsigned tmp;
|
|
int status = -EINVAL;
|
|
|
|
if (!ep || !desc)
|
|
return -EINVAL;
|
|
|
|
musb_ep = to_musb_ep(ep);
|
|
hw_ep = musb_ep->hw_ep;
|
|
regs = hw_ep->regs;
|
|
musb = musb_ep->musb;
|
|
mbase = musb->mregs;
|
|
epnum = musb_ep->current_epnum;
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
|
|
if (musb_ep->desc) {
|
|
status = -EBUSY;
|
|
goto fail;
|
|
}
|
|
musb_ep->type = usb_endpoint_type(desc);
|
|
|
|
/* check direction and (later) maxpacket size against endpoint */
|
|
if (usb_endpoint_num(desc) != epnum)
|
|
goto fail;
|
|
|
|
/* REVISIT this rules out high bandwidth periodic transfers */
|
|
tmp = usb_endpoint_maxp(desc);
|
|
if (tmp & ~0x07ff) {
|
|
int ok;
|
|
|
|
if (usb_endpoint_dir_in(desc))
|
|
ok = musb->hb_iso_tx;
|
|
else
|
|
ok = musb->hb_iso_rx;
|
|
|
|
if (!ok) {
|
|
dev_dbg(musb->controller, "no support for high bandwidth ISO\n");
|
|
goto fail;
|
|
}
|
|
musb_ep->hb_mult = (tmp >> 11) & 3;
|
|
} else {
|
|
musb_ep->hb_mult = 0;
|
|
}
|
|
|
|
musb_ep->packet_sz = tmp & 0x7ff;
|
|
tmp = musb_ep->packet_sz * (musb_ep->hb_mult + 1);
|
|
|
|
/* enable the interrupts for the endpoint, set the endpoint
|
|
* packet size (or fail), set the mode, clear the fifo
|
|
*/
|
|
musb_ep_select(mbase, epnum);
|
|
if (usb_endpoint_dir_in(desc)) {
|
|
u16 int_txe = musb_readw(mbase, MUSB_INTRTXE);
|
|
|
|
if (hw_ep->is_shared_fifo)
|
|
musb_ep->is_in = 1;
|
|
if (!musb_ep->is_in)
|
|
goto fail;
|
|
|
|
if (tmp > hw_ep->max_packet_sz_tx) {
|
|
dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
|
|
goto fail;
|
|
}
|
|
|
|
int_txe |= (1 << epnum);
|
|
musb_writew(mbase, MUSB_INTRTXE, int_txe);
|
|
|
|
/* REVISIT if can_bulk_split(), use by updating "tmp";
|
|
* likewise high bandwidth periodic tx
|
|
*/
|
|
/* Set TXMAXP with the FIFO size of the endpoint
|
|
* to disable double buffering mode.
|
|
*/
|
|
if (musb->double_buffer_not_ok)
|
|
musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx);
|
|
else
|
|
musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz
|
|
| (musb_ep->hb_mult << 11));
|
|
|
|
csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG;
|
|
if (musb_readw(regs, MUSB_TXCSR)
|
|
& MUSB_TXCSR_FIFONOTEMPTY)
|
|
csr |= MUSB_TXCSR_FLUSHFIFO;
|
|
if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
|
|
csr |= MUSB_TXCSR_P_ISO;
|
|
|
|
/* set twice in case of double buffering */
|
|
musb_writew(regs, MUSB_TXCSR, csr);
|
|
/* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
|
|
musb_writew(regs, MUSB_TXCSR, csr);
|
|
|
|
} else {
|
|
u16 int_rxe = musb_readw(mbase, MUSB_INTRRXE);
|
|
|
|
if (hw_ep->is_shared_fifo)
|
|
musb_ep->is_in = 0;
|
|
if (musb_ep->is_in)
|
|
goto fail;
|
|
|
|
if (tmp > hw_ep->max_packet_sz_rx) {
|
|
dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
|
|
goto fail;
|
|
}
|
|
|
|
int_rxe |= (1 << epnum);
|
|
musb_writew(mbase, MUSB_INTRRXE, int_rxe);
|
|
|
|
/* REVISIT if can_bulk_combine() use by updating "tmp"
|
|
* likewise high bandwidth periodic rx
|
|
*/
|
|
/* Set RXMAXP with the FIFO size of the endpoint
|
|
* to disable double buffering mode.
|
|
*/
|
|
if (musb->double_buffer_not_ok)
|
|
musb_writew(regs, MUSB_RXMAXP, hw_ep->max_packet_sz_tx);
|
|
else
|
|
musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz
|
|
| (musb_ep->hb_mult << 11));
|
|
|
|
/* force shared fifo to OUT-only mode */
|
|
if (hw_ep->is_shared_fifo) {
|
|
csr = musb_readw(regs, MUSB_TXCSR);
|
|
csr &= ~(MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY);
|
|
musb_writew(regs, MUSB_TXCSR, csr);
|
|
}
|
|
|
|
csr = MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_CLRDATATOG;
|
|
if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
|
|
csr |= MUSB_RXCSR_P_ISO;
|
|
else if (musb_ep->type == USB_ENDPOINT_XFER_INT)
|
|
csr |= MUSB_RXCSR_DISNYET;
|
|
|
|
/* set twice in case of double buffering */
|
|
musb_writew(regs, MUSB_RXCSR, csr);
|
|
musb_writew(regs, MUSB_RXCSR, csr);
|
|
}
|
|
|
|
/* NOTE: all the I/O code _should_ work fine without DMA, in case
|
|
* for some reason you run out of channels here.
|
|
*/
|
|
if (is_dma_capable() && musb->dma_controller) {
|
|
struct dma_controller *c = musb->dma_controller;
|
|
|
|
musb_ep->dma = c->channel_alloc(c, hw_ep,
|
|
(desc->bEndpointAddress & USB_DIR_IN));
|
|
} else
|
|
musb_ep->dma = NULL;
|
|
|
|
musb_ep->desc = desc;
|
|
musb_ep->busy = 0;
|
|
musb_ep->wedged = 0;
|
|
status = 0;
|
|
|
|
pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n",
|
|
musb_driver_name, musb_ep->end_point.name,
|
|
({ char *s; switch (musb_ep->type) {
|
|
case USB_ENDPOINT_XFER_BULK: s = "bulk"; break;
|
|
case USB_ENDPOINT_XFER_INT: s = "int"; break;
|
|
default: s = "iso"; break;
|
|
}; s; }),
|
|
musb_ep->is_in ? "IN" : "OUT",
|
|
musb_ep->dma ? "dma, " : "",
|
|
musb_ep->packet_sz);
|
|
|
|
schedule_work(&musb->irq_work);
|
|
|
|
fail:
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Disable an endpoint flushing all requests queued.
|
|
*/
|
|
static int musb_gadget_disable(struct usb_ep *ep)
|
|
{
|
|
unsigned long flags;
|
|
struct musb *musb;
|
|
u8 epnum;
|
|
struct musb_ep *musb_ep;
|
|
void __iomem *epio;
|
|
int status = 0;
|
|
|
|
musb_ep = to_musb_ep(ep);
|
|
musb = musb_ep->musb;
|
|
epnum = musb_ep->current_epnum;
|
|
epio = musb->endpoints[epnum].regs;
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
musb_ep_select(musb->mregs, epnum);
|
|
|
|
/* zero the endpoint sizes */
|
|
if (musb_ep->is_in) {
|
|
u16 int_txe = musb_readw(musb->mregs, MUSB_INTRTXE);
|
|
int_txe &= ~(1 << epnum);
|
|
musb_writew(musb->mregs, MUSB_INTRTXE, int_txe);
|
|
musb_writew(epio, MUSB_TXMAXP, 0);
|
|
} else {
|
|
u16 int_rxe = musb_readw(musb->mregs, MUSB_INTRRXE);
|
|
int_rxe &= ~(1 << epnum);
|
|
musb_writew(musb->mregs, MUSB_INTRRXE, int_rxe);
|
|
musb_writew(epio, MUSB_RXMAXP, 0);
|
|
}
|
|
|
|
musb_ep->desc = NULL;
|
|
|
|
/* abort all pending DMA and requests */
|
|
nuke(musb_ep, -ESHUTDOWN);
|
|
|
|
schedule_work(&musb->irq_work);
|
|
|
|
spin_unlock_irqrestore(&(musb->lock), flags);
|
|
|
|
dev_dbg(musb->controller, "%s\n", musb_ep->end_point.name);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Allocate a request for an endpoint.
|
|
* Reused by ep0 code.
|
|
*/
|
|
struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
|
|
{
|
|
struct musb_ep *musb_ep = to_musb_ep(ep);
|
|
struct musb *musb = musb_ep->musb;
|
|
struct musb_request *request = NULL;
|
|
|
|
request = kzalloc(sizeof *request, gfp_flags);
|
|
if (!request) {
|
|
dev_dbg(musb->controller, "not enough memory\n");
|
|
return NULL;
|
|
}
|
|
|
|
request->request.dma = DMA_ADDR_INVALID;
|
|
request->epnum = musb_ep->current_epnum;
|
|
request->ep = musb_ep;
|
|
|
|
return &request->request;
|
|
}
|
|
|
|
/*
|
|
* Free a request
|
|
* Reused by ep0 code.
|
|
*/
|
|
void musb_free_request(struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
kfree(to_musb_request(req));
|
|
}
|
|
|
|
static LIST_HEAD(buffers);
|
|
|
|
struct free_record {
|
|
struct list_head list;
|
|
struct device *dev;
|
|
unsigned bytes;
|
|
dma_addr_t dma;
|
|
};
|
|
|
|
/*
|
|
* Context: controller locked, IRQs blocked.
|
|
*/
|
|
void musb_ep_restart(struct musb *musb, struct musb_request *req)
|
|
{
|
|
dev_dbg(musb->controller, "<== %s request %p len %u on hw_ep%d\n",
|
|
req->tx ? "TX/IN" : "RX/OUT",
|
|
&req->request, req->request.length, req->epnum);
|
|
|
|
musb_ep_select(musb->mregs, req->epnum);
|
|
if (req->tx)
|
|
txstate(musb, req);
|
|
else
|
|
rxstate(musb, req);
|
|
}
|
|
|
|
static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct musb_ep *musb_ep;
|
|
struct musb_request *request;
|
|
struct musb *musb;
|
|
int status = 0;
|
|
unsigned long lockflags;
|
|
|
|
if (!ep || !req)
|
|
return -EINVAL;
|
|
if (!req->buf)
|
|
return -ENODATA;
|
|
|
|
musb_ep = to_musb_ep(ep);
|
|
musb = musb_ep->musb;
|
|
|
|
request = to_musb_request(req);
|
|
request->musb = musb;
|
|
|
|
if (request->ep != musb_ep)
|
|
return -EINVAL;
|
|
|
|
dev_dbg(musb->controller, "<== to %s request=%p\n", ep->name, req);
|
|
|
|
/* request is mine now... */
|
|
request->request.actual = 0;
|
|
request->request.status = -EINPROGRESS;
|
|
request->epnum = musb_ep->current_epnum;
|
|
request->tx = musb_ep->is_in;
|
|
|
|
map_dma_buffer(request, musb, musb_ep);
|
|
|
|
spin_lock_irqsave(&musb->lock, lockflags);
|
|
|
|
/* don't queue if the ep is down */
|
|
if (!musb_ep->desc) {
|
|
dev_dbg(musb->controller, "req %p queued to %s while ep %s\n",
|
|
req, ep->name, "disabled");
|
|
status = -ESHUTDOWN;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* add request to the list */
|
|
list_add_tail(&request->list, &musb_ep->req_list);
|
|
|
|
/* it this is the head of the queue, start i/o ... */
|
|
if (!musb_ep->busy && &request->list == musb_ep->req_list.next)
|
|
musb_ep_restart(musb, request);
|
|
|
|
cleanup:
|
|
spin_unlock_irqrestore(&musb->lock, lockflags);
|
|
return status;
|
|
}
|
|
|
|
static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request)
|
|
{
|
|
struct musb_ep *musb_ep = to_musb_ep(ep);
|
|
struct musb_request *req = to_musb_request(request);
|
|
struct musb_request *r;
|
|
unsigned long flags;
|
|
int status = 0;
|
|
struct musb *musb = musb_ep->musb;
|
|
|
|
if (!ep || !request || to_musb_request(request)->ep != musb_ep)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
|
|
list_for_each_entry(r, &musb_ep->req_list, list) {
|
|
if (r == req)
|
|
break;
|
|
}
|
|
if (r != req) {
|
|
dev_dbg(musb->controller, "request %p not queued to %s\n", request, ep->name);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
/* if the hardware doesn't have the request, easy ... */
|
|
if (musb_ep->req_list.next != &req->list || musb_ep->busy)
|
|
musb_g_giveback(musb_ep, request, -ECONNRESET);
|
|
|
|
/* ... else abort the dma transfer ... */
|
|
else if (is_dma_capable() && musb_ep->dma) {
|
|
struct dma_controller *c = musb->dma_controller;
|
|
|
|
musb_ep_select(musb->mregs, musb_ep->current_epnum);
|
|
if (c->channel_abort)
|
|
status = c->channel_abort(musb_ep->dma);
|
|
else
|
|
status = -EBUSY;
|
|
if (status == 0)
|
|
musb_g_giveback(musb_ep, request, -ECONNRESET);
|
|
} else {
|
|
/* NOTE: by sticking to easily tested hardware/driver states,
|
|
* we leave counting of in-flight packets imprecise.
|
|
*/
|
|
musb_g_giveback(musb_ep, request, -ECONNRESET);
|
|
}
|
|
|
|
done:
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Set or clear the halt bit of an endpoint. A halted enpoint won't tx/rx any
|
|
* data but will queue requests.
|
|
*
|
|
* exported to ep0 code
|
|
*/
|
|
static int musb_gadget_set_halt(struct usb_ep *ep, int value)
|
|
{
|
|
struct musb_ep *musb_ep = to_musb_ep(ep);
|
|
u8 epnum = musb_ep->current_epnum;
|
|
struct musb *musb = musb_ep->musb;
|
|
void __iomem *epio = musb->endpoints[epnum].regs;
|
|
void __iomem *mbase;
|
|
unsigned long flags;
|
|
u16 csr;
|
|
struct musb_request *request;
|
|
int status = 0;
|
|
|
|
if (!ep)
|
|
return -EINVAL;
|
|
mbase = musb->mregs;
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
|
|
if ((USB_ENDPOINT_XFER_ISOC == musb_ep->type)) {
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
musb_ep_select(mbase, epnum);
|
|
|
|
request = next_request(musb_ep);
|
|
if (value) {
|
|
if (request) {
|
|
dev_dbg(musb->controller, "request in progress, cannot halt %s\n",
|
|
ep->name);
|
|
status = -EAGAIN;
|
|
goto done;
|
|
}
|
|
/* Cannot portably stall with non-empty FIFO */
|
|
if (musb_ep->is_in) {
|
|
csr = musb_readw(epio, MUSB_TXCSR);
|
|
if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
|
|
dev_dbg(musb->controller, "FIFO busy, cannot halt %s\n", ep->name);
|
|
status = -EAGAIN;
|
|
goto done;
|
|
}
|
|
}
|
|
} else
|
|
musb_ep->wedged = 0;
|
|
|
|
/* set/clear the stall and toggle bits */
|
|
dev_dbg(musb->controller, "%s: %s stall\n", ep->name, value ? "set" : "clear");
|
|
if (musb_ep->is_in) {
|
|
csr = musb_readw(epio, MUSB_TXCSR);
|
|
csr |= MUSB_TXCSR_P_WZC_BITS
|
|
| MUSB_TXCSR_CLRDATATOG;
|
|
if (value)
|
|
csr |= MUSB_TXCSR_P_SENDSTALL;
|
|
else
|
|
csr &= ~(MUSB_TXCSR_P_SENDSTALL
|
|
| MUSB_TXCSR_P_SENTSTALL);
|
|
csr &= ~MUSB_TXCSR_TXPKTRDY;
|
|
musb_writew(epio, MUSB_TXCSR, csr);
|
|
} else {
|
|
csr = musb_readw(epio, MUSB_RXCSR);
|
|
csr |= MUSB_RXCSR_P_WZC_BITS
|
|
| MUSB_RXCSR_FLUSHFIFO
|
|
| MUSB_RXCSR_CLRDATATOG;
|
|
if (value)
|
|
csr |= MUSB_RXCSR_P_SENDSTALL;
|
|
else
|
|
csr &= ~(MUSB_RXCSR_P_SENDSTALL
|
|
| MUSB_RXCSR_P_SENTSTALL);
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
}
|
|
|
|
/* maybe start the first request in the queue */
|
|
if (!musb_ep->busy && !value && request) {
|
|
dev_dbg(musb->controller, "restarting the request\n");
|
|
musb_ep_restart(musb, request);
|
|
}
|
|
|
|
done:
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Sets the halt feature with the clear requests ignored
|
|
*/
|
|
static int musb_gadget_set_wedge(struct usb_ep *ep)
|
|
{
|
|
struct musb_ep *musb_ep = to_musb_ep(ep);
|
|
|
|
if (!ep)
|
|
return -EINVAL;
|
|
|
|
musb_ep->wedged = 1;
|
|
|
|
return usb_ep_set_halt(ep);
|
|
}
|
|
|
|
static int musb_gadget_fifo_status(struct usb_ep *ep)
|
|
{
|
|
struct musb_ep *musb_ep = to_musb_ep(ep);
|
|
void __iomem *epio = musb_ep->hw_ep->regs;
|
|
int retval = -EINVAL;
|
|
|
|
if (musb_ep->desc && !musb_ep->is_in) {
|
|
struct musb *musb = musb_ep->musb;
|
|
int epnum = musb_ep->current_epnum;
|
|
void __iomem *mbase = musb->mregs;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
|
|
musb_ep_select(mbase, epnum);
|
|
/* FIXME return zero unless RXPKTRDY is set */
|
|
retval = musb_readw(epio, MUSB_RXCOUNT);
|
|
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static void musb_gadget_fifo_flush(struct usb_ep *ep)
|
|
{
|
|
struct musb_ep *musb_ep = to_musb_ep(ep);
|
|
struct musb *musb = musb_ep->musb;
|
|
u8 epnum = musb_ep->current_epnum;
|
|
void __iomem *epio = musb->endpoints[epnum].regs;
|
|
void __iomem *mbase;
|
|
unsigned long flags;
|
|
u16 csr, int_txe;
|
|
|
|
mbase = musb->mregs;
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
musb_ep_select(mbase, (u8) epnum);
|
|
|
|
/* disable interrupts */
|
|
int_txe = musb_readw(mbase, MUSB_INTRTXE);
|
|
musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
|
|
|
|
if (musb_ep->is_in) {
|
|
csr = musb_readw(epio, MUSB_TXCSR);
|
|
if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
|
|
csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_P_WZC_BITS;
|
|
/*
|
|
* Setting both TXPKTRDY and FLUSHFIFO makes controller
|
|
* to interrupt current FIFO loading, but not flushing
|
|
* the already loaded ones.
|
|
*/
|
|
csr &= ~MUSB_TXCSR_TXPKTRDY;
|
|
musb_writew(epio, MUSB_TXCSR, csr);
|
|
/* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
|
|
musb_writew(epio, MUSB_TXCSR, csr);
|
|
}
|
|
} else {
|
|
csr = musb_readw(epio, MUSB_RXCSR);
|
|
csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_P_WZC_BITS;
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
musb_writew(epio, MUSB_RXCSR, csr);
|
|
}
|
|
|
|
/* re-enable interrupt */
|
|
musb_writew(mbase, MUSB_INTRTXE, int_txe);
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
}
|
|
|
|
static const struct usb_ep_ops musb_ep_ops = {
|
|
.enable = musb_gadget_enable,
|
|
.disable = musb_gadget_disable,
|
|
.alloc_request = musb_alloc_request,
|
|
.free_request = musb_free_request,
|
|
.queue = musb_gadget_queue,
|
|
.dequeue = musb_gadget_dequeue,
|
|
.set_halt = musb_gadget_set_halt,
|
|
.set_wedge = musb_gadget_set_wedge,
|
|
.fifo_status = musb_gadget_fifo_status,
|
|
.fifo_flush = musb_gadget_fifo_flush
|
|
};
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static int musb_gadget_get_frame(struct usb_gadget *gadget)
|
|
{
|
|
struct musb *musb = gadget_to_musb(gadget);
|
|
|
|
return (int)musb_readw(musb->mregs, MUSB_FRAME);
|
|
}
|
|
|
|
static int musb_gadget_wakeup(struct usb_gadget *gadget)
|
|
{
|
|
struct musb *musb = gadget_to_musb(gadget);
|
|
void __iomem *mregs = musb->mregs;
|
|
unsigned long flags;
|
|
int status = -EINVAL;
|
|
u8 power, devctl;
|
|
int retries;
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
|
|
switch (musb->xceiv->state) {
|
|
case OTG_STATE_B_PERIPHERAL:
|
|
/* NOTE: OTG state machine doesn't include B_SUSPENDED;
|
|
* that's part of the standard usb 1.1 state machine, and
|
|
* doesn't affect OTG transitions.
|
|
*/
|
|
if (musb->may_wakeup && musb->is_suspended)
|
|
break;
|
|
goto done;
|
|
case OTG_STATE_B_IDLE:
|
|
/* Start SRP ... OTG not required. */
|
|
devctl = musb_readb(mregs, MUSB_DEVCTL);
|
|
dev_dbg(musb->controller, "Sending SRP: devctl: %02x\n", devctl);
|
|
devctl |= MUSB_DEVCTL_SESSION;
|
|
musb_writeb(mregs, MUSB_DEVCTL, devctl);
|
|
devctl = musb_readb(mregs, MUSB_DEVCTL);
|
|
retries = 100;
|
|
while (!(devctl & MUSB_DEVCTL_SESSION)) {
|
|
devctl = musb_readb(mregs, MUSB_DEVCTL);
|
|
if (retries-- < 1)
|
|
break;
|
|
}
|
|
retries = 10000;
|
|
while (devctl & MUSB_DEVCTL_SESSION) {
|
|
devctl = musb_readb(mregs, MUSB_DEVCTL);
|
|
if (retries-- < 1)
|
|
break;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
otg_start_srp(musb->xceiv);
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
|
|
/* Block idling for at least 1s */
|
|
musb_platform_try_idle(musb,
|
|
jiffies + msecs_to_jiffies(1 * HZ));
|
|
|
|
status = 0;
|
|
goto done;
|
|
default:
|
|
dev_dbg(musb->controller, "Unhandled wake: %s\n",
|
|
otg_state_string(musb->xceiv->state));
|
|
goto done;
|
|
}
|
|
|
|
status = 0;
|
|
|
|
power = musb_readb(mregs, MUSB_POWER);
|
|
power |= MUSB_POWER_RESUME;
|
|
musb_writeb(mregs, MUSB_POWER, power);
|
|
dev_dbg(musb->controller, "issue wakeup\n");
|
|
|
|
/* FIXME do this next chunk in a timer callback, no udelay */
|
|
mdelay(2);
|
|
|
|
power = musb_readb(mregs, MUSB_POWER);
|
|
power &= ~MUSB_POWER_RESUME;
|
|
musb_writeb(mregs, MUSB_POWER, power);
|
|
done:
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
musb_gadget_set_self_powered(struct usb_gadget *gadget, int is_selfpowered)
|
|
{
|
|
struct musb *musb = gadget_to_musb(gadget);
|
|
|
|
musb->is_self_powered = !!is_selfpowered;
|
|
return 0;
|
|
}
|
|
|
|
static void musb_pullup(struct musb *musb, int is_on)
|
|
{
|
|
u8 power;
|
|
|
|
power = musb_readb(musb->mregs, MUSB_POWER);
|
|
if (is_on)
|
|
power |= MUSB_POWER_SOFTCONN;
|
|
else
|
|
power &= ~MUSB_POWER_SOFTCONN;
|
|
|
|
/* FIXME if on, HdrcStart; if off, HdrcStop */
|
|
|
|
dev_dbg(musb->controller, "gadget D+ pullup %s\n",
|
|
is_on ? "on" : "off");
|
|
musb_writeb(musb->mregs, MUSB_POWER, power);
|
|
}
|
|
|
|
#if 0
|
|
static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active)
|
|
{
|
|
dev_dbg(musb->controller, "<= %s =>\n", __func__);
|
|
|
|
/*
|
|
* FIXME iff driver's softconnect flag is set (as it is during probe,
|
|
* though that can clear it), just musb_pullup().
|
|
*/
|
|
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
|
|
{
|
|
struct musb *musb = gadget_to_musb(gadget);
|
|
|
|
if (!musb->xceiv->set_power)
|
|
return -EOPNOTSUPP;
|
|
return otg_set_power(musb->xceiv, mA);
|
|
}
|
|
|
|
static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on)
|
|
{
|
|
struct musb *musb = gadget_to_musb(gadget);
|
|
unsigned long flags;
|
|
|
|
is_on = !!is_on;
|
|
|
|
pm_runtime_get_sync(musb->controller);
|
|
|
|
/* NOTE: this assumes we are sensing vbus; we'd rather
|
|
* not pullup unless the B-session is active.
|
|
*/
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
if (is_on != musb->softconnect) {
|
|
musb->softconnect = is_on;
|
|
musb_pullup(musb, is_on);
|
|
}
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
|
|
pm_runtime_put(musb->controller);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int musb_gadget_start(struct usb_gadget *g,
|
|
struct usb_gadget_driver *driver);
|
|
static int musb_gadget_stop(struct usb_gadget *g,
|
|
struct usb_gadget_driver *driver);
|
|
|
|
static const struct usb_gadget_ops musb_gadget_operations = {
|
|
.get_frame = musb_gadget_get_frame,
|
|
.wakeup = musb_gadget_wakeup,
|
|
.set_selfpowered = musb_gadget_set_self_powered,
|
|
/* .vbus_session = musb_gadget_vbus_session, */
|
|
.vbus_draw = musb_gadget_vbus_draw,
|
|
.pullup = musb_gadget_pullup,
|
|
.udc_start = musb_gadget_start,
|
|
.udc_stop = musb_gadget_stop,
|
|
};
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/* Registration */
|
|
|
|
/* Only this registration code "knows" the rule (from USB standards)
|
|
* about there being only one external upstream port. It assumes
|
|
* all peripheral ports are external...
|
|
*/
|
|
|
|
static void musb_gadget_release(struct device *dev)
|
|
{
|
|
/* kref_put(WHAT) */
|
|
dev_dbg(dev, "%s\n", __func__);
|
|
}
|
|
|
|
|
|
static void __init
|
|
init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in)
|
|
{
|
|
struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
|
|
|
|
memset(ep, 0, sizeof *ep);
|
|
|
|
ep->current_epnum = epnum;
|
|
ep->musb = musb;
|
|
ep->hw_ep = hw_ep;
|
|
ep->is_in = is_in;
|
|
|
|
INIT_LIST_HEAD(&ep->req_list);
|
|
|
|
sprintf(ep->name, "ep%d%s", epnum,
|
|
(!epnum || hw_ep->is_shared_fifo) ? "" : (
|
|
is_in ? "in" : "out"));
|
|
ep->end_point.name = ep->name;
|
|
INIT_LIST_HEAD(&ep->end_point.ep_list);
|
|
if (!epnum) {
|
|
ep->end_point.maxpacket = 64;
|
|
ep->end_point.ops = &musb_g_ep0_ops;
|
|
musb->g.ep0 = &ep->end_point;
|
|
} else {
|
|
if (is_in)
|
|
ep->end_point.maxpacket = hw_ep->max_packet_sz_tx;
|
|
else
|
|
ep->end_point.maxpacket = hw_ep->max_packet_sz_rx;
|
|
ep->end_point.ops = &musb_ep_ops;
|
|
list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize the endpoints exposed to peripheral drivers, with backlinks
|
|
* to the rest of the driver state.
|
|
*/
|
|
static inline void __init musb_g_init_endpoints(struct musb *musb)
|
|
{
|
|
u8 epnum;
|
|
struct musb_hw_ep *hw_ep;
|
|
unsigned count = 0;
|
|
|
|
/* initialize endpoint list just once */
|
|
INIT_LIST_HEAD(&(musb->g.ep_list));
|
|
|
|
for (epnum = 0, hw_ep = musb->endpoints;
|
|
epnum < musb->nr_endpoints;
|
|
epnum++, hw_ep++) {
|
|
if (hw_ep->is_shared_fifo /* || !epnum */) {
|
|
init_peripheral_ep(musb, &hw_ep->ep_in, epnum, 0);
|
|
count++;
|
|
} else {
|
|
if (hw_ep->max_packet_sz_tx) {
|
|
init_peripheral_ep(musb, &hw_ep->ep_in,
|
|
epnum, 1);
|
|
count++;
|
|
}
|
|
if (hw_ep->max_packet_sz_rx) {
|
|
init_peripheral_ep(musb, &hw_ep->ep_out,
|
|
epnum, 0);
|
|
count++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* called once during driver setup to initialize and link into
|
|
* the driver model; memory is zeroed.
|
|
*/
|
|
int __init musb_gadget_setup(struct musb *musb)
|
|
{
|
|
int status;
|
|
|
|
/* REVISIT minor race: if (erroneously) setting up two
|
|
* musb peripherals at the same time, only the bus lock
|
|
* is probably held.
|
|
*/
|
|
|
|
musb->g.ops = &musb_gadget_operations;
|
|
musb->g.is_dualspeed = 1;
|
|
musb->g.speed = USB_SPEED_UNKNOWN;
|
|
|
|
/* this "gadget" abstracts/virtualizes the controller */
|
|
dev_set_name(&musb->g.dev, "gadget");
|
|
musb->g.dev.parent = musb->controller;
|
|
musb->g.dev.dma_mask = musb->controller->dma_mask;
|
|
musb->g.dev.release = musb_gadget_release;
|
|
musb->g.name = musb_driver_name;
|
|
|
|
if (is_otg_enabled(musb))
|
|
musb->g.is_otg = 1;
|
|
|
|
musb_g_init_endpoints(musb);
|
|
|
|
musb->is_active = 0;
|
|
musb_platform_try_idle(musb, 0);
|
|
|
|
status = device_register(&musb->g.dev);
|
|
if (status != 0) {
|
|
put_device(&musb->g.dev);
|
|
return status;
|
|
}
|
|
status = usb_add_gadget_udc(musb->controller, &musb->g);
|
|
if (status)
|
|
goto err;
|
|
|
|
return 0;
|
|
err:
|
|
musb->g.dev.parent = NULL;
|
|
device_unregister(&musb->g.dev);
|
|
return status;
|
|
}
|
|
|
|
void musb_gadget_cleanup(struct musb *musb)
|
|
{
|
|
usb_del_gadget_udc(&musb->g);
|
|
if (musb->g.dev.parent)
|
|
device_unregister(&musb->g.dev);
|
|
}
|
|
|
|
/*
|
|
* Register the gadget driver. Used by gadget drivers when
|
|
* registering themselves with the controller.
|
|
*
|
|
* -EINVAL something went wrong (not driver)
|
|
* -EBUSY another gadget is already using the controller
|
|
* -ENOMEM no memory to perform the operation
|
|
*
|
|
* @param driver the gadget driver
|
|
* @return <0 if error, 0 if everything is fine
|
|
*/
|
|
static int musb_gadget_start(struct usb_gadget *g,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
struct musb *musb = gadget_to_musb(g);
|
|
unsigned long flags;
|
|
int retval = -EINVAL;
|
|
|
|
if (driver->speed != USB_SPEED_HIGH)
|
|
goto err0;
|
|
|
|
pm_runtime_get_sync(musb->controller);
|
|
|
|
dev_dbg(musb->controller, "registering driver %s\n", driver->function);
|
|
|
|
musb->softconnect = 0;
|
|
musb->gadget_driver = driver;
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
musb->is_active = 1;
|
|
|
|
otg_set_peripheral(musb->xceiv, &musb->g);
|
|
musb->xceiv->state = OTG_STATE_B_IDLE;
|
|
|
|
/*
|
|
* FIXME this ignores the softconnect flag. Drivers are
|
|
* allowed hold the peripheral inactive until for example
|
|
* userspace hooks up printer hardware or DSP codecs, so
|
|
* hosts only see fully functional devices.
|
|
*/
|
|
|
|
if (!is_otg_enabled(musb))
|
|
musb_start(musb);
|
|
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
|
|
if (is_otg_enabled(musb)) {
|
|
struct usb_hcd *hcd = musb_to_hcd(musb);
|
|
|
|
dev_dbg(musb->controller, "OTG startup...\n");
|
|
|
|
/* REVISIT: funcall to other code, which also
|
|
* handles power budgeting ... this way also
|
|
* ensures HdrcStart is indirectly called.
|
|
*/
|
|
retval = usb_add_hcd(musb_to_hcd(musb), -1, 0);
|
|
if (retval < 0) {
|
|
dev_dbg(musb->controller, "add_hcd failed, %d\n", retval);
|
|
goto err2;
|
|
}
|
|
|
|
if ((musb->xceiv->last_event == USB_EVENT_ID)
|
|
&& musb->xceiv->set_vbus)
|
|
otg_set_vbus(musb->xceiv, 1);
|
|
|
|
hcd->self.uses_pio_for_control = 1;
|
|
}
|
|
if (musb->xceiv->last_event == USB_EVENT_NONE)
|
|
pm_runtime_put(musb->controller);
|
|
|
|
return 0;
|
|
|
|
err2:
|
|
if (!is_otg_enabled(musb))
|
|
musb_stop(musb);
|
|
err0:
|
|
return retval;
|
|
}
|
|
|
|
static void stop_activity(struct musb *musb, struct usb_gadget_driver *driver)
|
|
{
|
|
int i;
|
|
struct musb_hw_ep *hw_ep;
|
|
|
|
/* don't disconnect if it's not connected */
|
|
if (musb->g.speed == USB_SPEED_UNKNOWN)
|
|
driver = NULL;
|
|
else
|
|
musb->g.speed = USB_SPEED_UNKNOWN;
|
|
|
|
/* deactivate the hardware */
|
|
if (musb->softconnect) {
|
|
musb->softconnect = 0;
|
|
musb_pullup(musb, 0);
|
|
}
|
|
musb_stop(musb);
|
|
|
|
/* killing any outstanding requests will quiesce the driver;
|
|
* then report disconnect
|
|
*/
|
|
if (driver) {
|
|
for (i = 0, hw_ep = musb->endpoints;
|
|
i < musb->nr_endpoints;
|
|
i++, hw_ep++) {
|
|
musb_ep_select(musb->mregs, i);
|
|
if (hw_ep->is_shared_fifo /* || !epnum */) {
|
|
nuke(&hw_ep->ep_in, -ESHUTDOWN);
|
|
} else {
|
|
if (hw_ep->max_packet_sz_tx)
|
|
nuke(&hw_ep->ep_in, -ESHUTDOWN);
|
|
if (hw_ep->max_packet_sz_rx)
|
|
nuke(&hw_ep->ep_out, -ESHUTDOWN);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unregister the gadget driver. Used by gadget drivers when
|
|
* unregistering themselves from the controller.
|
|
*
|
|
* @param driver the gadget driver to unregister
|
|
*/
|
|
static int musb_gadget_stop(struct usb_gadget *g,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
struct musb *musb = gadget_to_musb(g);
|
|
unsigned long flags;
|
|
|
|
if (musb->xceiv->last_event == USB_EVENT_NONE)
|
|
pm_runtime_get_sync(musb->controller);
|
|
|
|
/*
|
|
* REVISIT always use otg_set_peripheral() here too;
|
|
* this needs to shut down the OTG engine.
|
|
*/
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
|
|
musb_hnp_stop(musb);
|
|
|
|
(void) musb_gadget_vbus_draw(&musb->g, 0);
|
|
|
|
musb->xceiv->state = OTG_STATE_UNDEFINED;
|
|
stop_activity(musb, driver);
|
|
otg_set_peripheral(musb->xceiv, NULL);
|
|
|
|
dev_dbg(musb->controller, "unregistering driver %s\n", driver->function);
|
|
|
|
musb->is_active = 0;
|
|
musb_platform_try_idle(musb, 0);
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
|
|
if (is_otg_enabled(musb)) {
|
|
usb_remove_hcd(musb_to_hcd(musb));
|
|
/* FIXME we need to be able to register another
|
|
* gadget driver here and have everything work;
|
|
* that currently misbehaves.
|
|
*/
|
|
}
|
|
|
|
if (!is_otg_enabled(musb))
|
|
musb_stop(musb);
|
|
|
|
pm_runtime_put(musb->controller);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/* lifecycle operations called through plat_uds.c */
|
|
|
|
void musb_g_resume(struct musb *musb)
|
|
{
|
|
musb->is_suspended = 0;
|
|
switch (musb->xceiv->state) {
|
|
case OTG_STATE_B_IDLE:
|
|
break;
|
|
case OTG_STATE_B_WAIT_ACON:
|
|
case OTG_STATE_B_PERIPHERAL:
|
|
musb->is_active = 1;
|
|
if (musb->gadget_driver && musb->gadget_driver->resume) {
|
|
spin_unlock(&musb->lock);
|
|
musb->gadget_driver->resume(&musb->g);
|
|
spin_lock(&musb->lock);
|
|
}
|
|
break;
|
|
default:
|
|
WARNING("unhandled RESUME transition (%s)\n",
|
|
otg_state_string(musb->xceiv->state));
|
|
}
|
|
}
|
|
|
|
/* called when SOF packets stop for 3+ msec */
|
|
void musb_g_suspend(struct musb *musb)
|
|
{
|
|
u8 devctl;
|
|
|
|
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
|
|
dev_dbg(musb->controller, "devctl %02x\n", devctl);
|
|
|
|
switch (musb->xceiv->state) {
|
|
case OTG_STATE_B_IDLE:
|
|
if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
|
|
musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
|
|
break;
|
|
case OTG_STATE_B_PERIPHERAL:
|
|
musb->is_suspended = 1;
|
|
if (musb->gadget_driver && musb->gadget_driver->suspend) {
|
|
spin_unlock(&musb->lock);
|
|
musb->gadget_driver->suspend(&musb->g);
|
|
spin_lock(&musb->lock);
|
|
}
|
|
break;
|
|
default:
|
|
/* REVISIT if B_HOST, clear DEVCTL.HOSTREQ;
|
|
* A_PERIPHERAL may need care too
|
|
*/
|
|
WARNING("unhandled SUSPEND transition (%s)\n",
|
|
otg_state_string(musb->xceiv->state));
|
|
}
|
|
}
|
|
|
|
/* Called during SRP */
|
|
void musb_g_wakeup(struct musb *musb)
|
|
{
|
|
musb_gadget_wakeup(&musb->g);
|
|
}
|
|
|
|
/* called when VBUS drops below session threshold, and in other cases */
|
|
void musb_g_disconnect(struct musb *musb)
|
|
{
|
|
void __iomem *mregs = musb->mregs;
|
|
u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
|
|
|
|
dev_dbg(musb->controller, "devctl %02x\n", devctl);
|
|
|
|
/* clear HR */
|
|
musb_writeb(mregs, MUSB_DEVCTL, devctl & MUSB_DEVCTL_SESSION);
|
|
|
|
/* don't draw vbus until new b-default session */
|
|
(void) musb_gadget_vbus_draw(&musb->g, 0);
|
|
|
|
musb->g.speed = USB_SPEED_UNKNOWN;
|
|
if (musb->gadget_driver && musb->gadget_driver->disconnect) {
|
|
spin_unlock(&musb->lock);
|
|
musb->gadget_driver->disconnect(&musb->g);
|
|
spin_lock(&musb->lock);
|
|
}
|
|
|
|
switch (musb->xceiv->state) {
|
|
default:
|
|
dev_dbg(musb->controller, "Unhandled disconnect %s, setting a_idle\n",
|
|
otg_state_string(musb->xceiv->state));
|
|
musb->xceiv->state = OTG_STATE_A_IDLE;
|
|
MUSB_HST_MODE(musb);
|
|
break;
|
|
case OTG_STATE_A_PERIPHERAL:
|
|
musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
|
|
MUSB_HST_MODE(musb);
|
|
break;
|
|
case OTG_STATE_B_WAIT_ACON:
|
|
case OTG_STATE_B_HOST:
|
|
case OTG_STATE_B_PERIPHERAL:
|
|
case OTG_STATE_B_IDLE:
|
|
musb->xceiv->state = OTG_STATE_B_IDLE;
|
|
break;
|
|
case OTG_STATE_B_SRP_INIT:
|
|
break;
|
|
}
|
|
|
|
musb->is_active = 0;
|
|
}
|
|
|
|
void musb_g_reset(struct musb *musb)
|
|
__releases(musb->lock)
|
|
__acquires(musb->lock)
|
|
{
|
|
void __iomem *mbase = musb->mregs;
|
|
u8 devctl = musb_readb(mbase, MUSB_DEVCTL);
|
|
u8 power;
|
|
|
|
dev_dbg(musb->controller, "<== %s addr=%x driver '%s'\n",
|
|
(devctl & MUSB_DEVCTL_BDEVICE)
|
|
? "B-Device" : "A-Device",
|
|
musb_readb(mbase, MUSB_FADDR),
|
|
musb->gadget_driver
|
|
? musb->gadget_driver->driver.name
|
|
: NULL
|
|
);
|
|
|
|
/* report disconnect, if we didn't already (flushing EP state) */
|
|
if (musb->g.speed != USB_SPEED_UNKNOWN)
|
|
musb_g_disconnect(musb);
|
|
|
|
/* clear HR */
|
|
else if (devctl & MUSB_DEVCTL_HR)
|
|
musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
|
|
|
|
|
|
/* what speed did we negotiate? */
|
|
power = musb_readb(mbase, MUSB_POWER);
|
|
musb->g.speed = (power & MUSB_POWER_HSMODE)
|
|
? USB_SPEED_HIGH : USB_SPEED_FULL;
|
|
|
|
/* start in USB_STATE_DEFAULT */
|
|
musb->is_active = 1;
|
|
musb->is_suspended = 0;
|
|
MUSB_DEV_MODE(musb);
|
|
musb->address = 0;
|
|
musb->ep0_state = MUSB_EP0_STAGE_SETUP;
|
|
|
|
musb->may_wakeup = 0;
|
|
musb->g.b_hnp_enable = 0;
|
|
musb->g.a_alt_hnp_support = 0;
|
|
musb->g.a_hnp_support = 0;
|
|
|
|
/* Normal reset, as B-Device;
|
|
* or else after HNP, as A-Device
|
|
*/
|
|
if (devctl & MUSB_DEVCTL_BDEVICE) {
|
|
musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
|
|
musb->g.is_a_peripheral = 0;
|
|
} else if (is_otg_enabled(musb)) {
|
|
musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
|
|
musb->g.is_a_peripheral = 1;
|
|
} else
|
|
WARN_ON(1);
|
|
|
|
/* start with default limits on VBUS power draw */
|
|
(void) musb_gadget_vbus_draw(&musb->g,
|
|
is_otg_enabled(musb) ? 8 : 100);
|
|
}
|