Hi, On Mon, Aug 12, 2013 at 04:05:10PM +0200, Andreas Larsson wrote: > diff --git a/drivers/usb/gadget/gr_udc.c b/drivers/usb/gadget/gr_udc.c > new file mode 100644 > index 0000000..37a6c08 > --- /dev/null > +++ b/drivers/usb/gadget/gr_udc.c > @@ -0,0 +1,2268 @@ > +/* > + * USB Peripheral Controller driver for Aeroflex Gaisler GRUSBDC. > + * > + * 2013 (c) Aeroflex Gaisler AB > + * > + * This driver supports GRUSBDC USB Device Controller cores available in the > + * GRLIB VHDL IP core library. > + * > + * Full documentation of the GRUSBDC core can be found here: > + * http://www.gaisler.com/products/grlib/grip.pdf > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; either version 2 of the License, or (at your > + * option) any later version. > + * > + * Contributors: > + * - Andreas Larsson <andr...@gaisler.com> > + * - Marko Isomaki > + */ > + > +/* > + * A GRUSBDC core can have up to 16 IN endpoints and 16 OUT endpoints each > + * individually configurable to any of the four USB transfer types. This > driver > + * only supports cores in DMA mode. > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/slab.h> > +#include <linux/spinlock.h> > +#include <linux/errno.h> > +#include <linux/init.h> > +#include <linux/list.h> > +#include <linux/interrupt.h> > +#include <linux/device.h> > +#include <linux/usb/ch9.h> > +#include <linux/usb/gadget.h> > +#include <linux/dma-mapping.h> > +#include <linux/dmapool.h> > +#include <linux/debugfs.h> > +#include <linux/seq_file.h> > + > +#include <asm/byteorder.h> > +#include <asm/irq.h>
<linux/irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_address.h>
> +
> +/* #define VERBOSE_DEBUG */
we don't want this, we want verbose debug to be selectable on Kconfig,
which already is ;-)
> +#include "gr_udc.h"
> +
> +#define DRIVER_NAME "gr_udc"
> +#define DRIVER_DESC "Aeroflex Gaisler GRUSBDC USB Peripheral
> Controller"
> +
> +static const char driver_name[] = DRIVER_NAME;
> +static const char driver_desc[] = DRIVER_DESC;
> +
> +#define gr_read32(x) (ioread32be((x)))
> +#define gr_write32(x, v) (iowrite32be((v), (x)))
> +
> +/* USB speed and corresponding string calculated from status register value
> */
> +#define GR_SPEED(status) \
> + ((status & GR_STATUS_SP) ? USB_SPEED_FULL : USB_SPEED_HIGH)
> +#define GR_SPEED_STR(status) usb_speed_string(GR_SPEED(status))
> +
> +/* Size of hardware buffer calculated from epctrl register value */
> +#define GR_BUFFER_SIZE(epctrl) \
> + ((((epctrl) & GR_EPCTRL_BUFSZ_MASK) >> GR_EPCTRL_BUFSZ_POS) * \
> + GR_EPCTRL_BUFSZ_SCALER)
> +
> +/* ---------------------------------------------------------------------- */
> +/* Debug printout functionality */
> +
> +static const char * const gr_modestring[] = {"control", "iso", "bulk",
> "int"};
> +
> +static const char *gr_ep0state_string(enum gr_ep0state state)
> +{
> + static const char *const names[] = {
> + [GR_EP0_DISCONNECT] = "disconnect",
> + [GR_EP0_SETUP] = "setup",
> + [GR_EP0_IDATA] = "idata",
> + [GR_EP0_ODATA] = "odata",
> + [GR_EP0_ISTATUS] = "istatus",
> + [GR_EP0_OSTATUS] = "ostatus",
> + [GR_EP0_STALL] = "stall",
> + [GR_EP0_SUSPEND] = "suspend",
> + };
> +
> + if (state < 0 || state >= ARRAY_SIZE(names))
> + return "UNKNOWN";
> +
> + return names[state];
> +}
> +
> +#ifdef VERBOSE_DEBUG
> +
> +#define BPRINTF(buf, left, fmt, args...) \
> + do { \
> + int ret = snprintf(buf, left, fmt, ## args); \
> + buf += ret; \
> + left -= ret; \
> + } while (0)
nack, use dev_vdbg() instead.
> +static void gr_dbgprint_request(const char *str, struct gr_ep *ep,
> + struct gr_request *req)
> +{
> + char buffer[100];
NAK^10000000
use kernel facilities instead. printk() and all its friends already
print to a ring buffer.
> + u8 *data = (u8 *)req->req.buf;
you don't need to cast void pointers
> +static void gr_finish_request(struct gr_ep *ep, struct gr_request *req,
> + int status)
> +{
> + struct gr_udc *dev;
> +
> + list_del_init(&req->queue);
> +
> + if (likely(req->req.status == -EINPROGRESS))
> + req->req.status = status;
> + else
> + status = req->req.status;
> +
> + dev = ep->dev;
> + usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
> + gr_free_dma_desc_chain(dev, req);
> +
> + if (ep->is_in) /* For OUT, actual gets updated by the work handler */
> + req->req.actual = req->req.length;
> +
> + if (!status) {
> + if (ep->is_in)
> + gr_dbgprint_request("SENT", ep, req);
> + else
> + gr_dbgprint_request("RECV", ep, req);
> + }
> +
> + /* Prevent changes to ep->queue during callback */
> + ep->callback = 1;
> + if (req == dev->ep0reqo && !status) {
> + if (req->setup)
> + gr_ep0_setup(dev, req);
> + else
> + dev_err(dev->dev,
> + "Unexpected non setup packet on ep0in\n");
> + } else if (req->req.complete) {
> + unsigned long flags;
> +
> + /* Complete should be called with irqs disabled */
> + local_irq_save(flags);
I guess it'd be better if you called this with spin_lock_irqsave()
called before, then you can remove local_irq_save from here.
> + spin_unlock(&dev->lock);
> +
> + req->req.complete(&ep->ep, &req->req);
> +
> + spin_lock(&dev->lock);
> + local_irq_restore(flags);
> + }
> + ep->callback = 0;
> +
> + /* Catch up possible prevented ep handling during completion callback */
> + if (!ep->stopped)
> + schedule_work(&dev->work);
this workqueue is awkward, what's up with that ?
> +/* Call with non-NULL dev to do a devm-allocation */
> +static struct usb_request *__gr_alloc_request(struct device *dev,
> + struct usb_ep *_ep,
> + gfp_t gfp_flags)
> +{
> + struct gr_request *req;
> +
> + if (dev)
> + req = devm_kzalloc(dev, sizeof(*req), gfp_flags);
> + else
> + req = kzalloc(sizeof(*req), gfp_flags);
why would "dev" ever be NULL ?
> + if (!req)
> + return NULL;
> +
> + INIT_LIST_HEAD(&req->queue);
> +
> + return &req->req;
> +}
> +
> +#define gr_devm_alloc_request __gr_alloc_request
> +
> +/*
> + * Starts DMA for endpoint ep if there are requests in the queue.
> + *
> + * Must be called with dev->lock held and with !ep->stopped.
> + */
> +static void gr_start_dma(struct gr_ep *ep)
> +{
> + struct gr_request *req;
> + u32 dmactrl;
> +
> + if (list_empty(&ep->queue)) {
> + ep->dma_start = 0;
> + return;
> + }
> +
> + req = list_first_entry(&ep->queue, struct gr_request, queue);
> +
> + /* A descriptor should already have been allocated */
> + BUG_ON(!req->curr_desc);
> +
> + wmb(); /* Make sure all is settled before handing it over to DMA */
> +
> + /* Set the descriptor pointer in the hardware */
> + gr_write32(&ep->regs->dmaaddr, req->curr_desc->paddr);
> +
> + /* Announce available descriptors */
> + dmactrl = gr_read32(&ep->regs->dmactrl);
> + gr_write32(&ep->regs->dmactrl, dmactrl | GR_DMACTRL_DA);
> +
> + ep->dma_start = 1;
> +}
> +
> +/*
> + * Finishes the first request in the ep's queue and, if available, starts the
> + * next request in queue.
> + *
> + * Must be called with dev->lock held and with !ep->stopped.
> + */
> +static void gr_dma_advance(struct gr_ep *ep, int status)
> +{
> + struct gr_request *req;
> +
> + req = list_first_entry(&ep->queue, struct gr_request, queue);
> + gr_finish_request(ep, req, status);
> + gr_start_dma(ep); /* Regardless of ep->dma_start */
> +}
> +
> +/*
> + * Abort DMA for an endpoint. Sets the abort DMA bit which causes an ongoing
> DMA
> + * transfer to be canceled and clears GR_DMACTRL_DA.
> + *
> + * Must be called with dev->lock held.
> + */
> +static void gr_abort_dma(struct gr_ep *ep)
> +{
> + u32 dmactrl;
> +
> + dmactrl = gr_read32(&ep->regs->dmactrl);
> + gr_write32(&ep->regs->dmactrl, dmactrl | GR_DMACTRL_AD);
> +}
> +
> +/*
> + * Allocates and sets up a struct gr_dma_desc and putting it on the
> descriptor
> + * chain.
> + *
> + * Size is not used for OUT endpoints. Hardware can not be instructed to
> handle
> + * smaller buffer than MAXPL in the OUT direction.
> + */
> +static int gr_add_dma_desc(struct gr_ep *ep, struct gr_request *req,
> + dma_addr_t data, unsigned size, gfp_t gfp_flags)
> +{
> + struct gr_dma_desc *desc;
> +
> + desc = gr_alloc_dma_desc(ep, gfp_flags);
> + if (!desc)
> + return -ENOMEM;
> +
> + desc->data = data;
> + if (ep->is_in)
> + desc->ctrl =
> + (GR_DESC_IN_CTRL_LEN_MASK & size) | GR_DESC_IN_CTRL_EN;
> + else
> + desc->ctrl = GR_DESC_OUT_CTRL_IE;
> +
> + if (!req->first_desc) {
> + req->first_desc = desc;
> + req->curr_desc = desc;
> + } else {
> + req->last_desc->next_desc = desc;
> + req->last_desc->next = desc->paddr;
> + req->last_desc->ctrl |= GR_DESC_OUT_CTRL_NX;
> + }
> + req->last_desc = desc;
> +
> + return 0;
> +}
> +
> +/*
> + * Sets up a chain of struct gr_dma_descriptors pointing to buffers that
> + * together covers req->req.length bytes of the buffer at DMA address
> + * req->req.dma for the OUT direction.
> + *
> + * The first descriptor in the chain is enabled, the rest disabled. The work
> + * handler will later enable them one by one when needed so we can find out
> when
> + * the transfer is finished. For OUT endpoints, all descriptors therefore
> + * generate interrutps.
> + */
> +static int gr_setup_out_desc_list(struct gr_ep *ep, struct gr_request *req,
> + gfp_t gfp_flags)
> +{
> + u16 bytes_left; /* Bytes left to provide descriptors for */
> + u16 bytes_used; /* Bytes accommodated for */
> + int ret = 0;
> +
> + req->first_desc = NULL; /* Signals that no allocation is done yet */
> + bytes_left = req->req.length;
> + bytes_used = 0;
> + while (bytes_left > 0) {
> + dma_addr_t start = req->req.dma + bytes_used;
> + u16 size = min(bytes_left, ep->bytes_per_buffer);
> +
> + /* Should not happen however - gr_queue stops such lengths */
> + if (size < ep->bytes_per_buffer)
> + dev_warn(ep->dev->dev,
> + "Buffer overrun risk: %u < %u bytes/buffer\n",
> + size, ep->bytes_per_buffer);
> +
> + ret = gr_add_dma_desc(ep, req, start, size, gfp_flags);
> + if (ret)
> + goto alloc_err;
> +
> + bytes_left -= size;
> + bytes_used += size;
> + }
> +
> + req->first_desc->ctrl |= GR_DESC_OUT_CTRL_EN;
> +
> + return 0;
> +
> +alloc_err:
> + gr_free_dma_desc_chain(ep->dev, req);
> +
> + return ret;
> +}
> +
> +/*
> + * Sets up a chain of struct gr_dma_descriptors pointing to buffers that
> + * together covers req->req.length bytes of the buffer at DMA address
> + * req->req.dma for the IN direction.
> + *
> + * When more data is provided than the maximum payload size, the hardware
> splits
> + * this up into several payloads automatically. Moreover,
> ep->bytes_per_buffer
> + * is always set to a multiple of the maximum payload (restricted to the
> valid
> + * number of maximum payloads during high bandwidth isochronous or interrupt
> + * transfers)
> + *
> + * All descriptors are enabled from the beginning and we only generate an
> + * interrupt for the last one indicating that the entire request has been
> pushed
> + * to hardware.
> + */
> +static int gr_setup_in_desc_list(struct gr_ep *ep, struct gr_request *req,
> + gfp_t gfp_flags)
> +{
> + u16 bytes_left; /* Bytes left in req to provide descriptors for */
> + u16 bytes_used; /* Bytes in req accommodated for */
> + int ret = 0;
> +
> + req->first_desc = NULL; /* Signals that no allocation is done yet */
> + bytes_left = req->req.length;
> + bytes_used = 0;
> + do { /* Allow for zero length packets */
> + dma_addr_t start = req->req.dma + bytes_used;
> + u16 size = min(bytes_left, ep->bytes_per_buffer);
> +
> + ret = gr_add_dma_desc(ep, req, start, size, gfp_flags);
> + if (ret)
> + goto alloc_err;
> +
> + bytes_left -= size;
> + bytes_used += size;
> + } while (bytes_left > 0);
> +
> + /*
> + * Send an extra zero length packet to indicate that no more data is
> + * available when req->req.zero is set and the data length is even
> + * multiples of ep->ep.maxpacket.
> + */
> + if (req->req.zero && (req->req.length % ep->ep.maxpacket == 0)) {
> + ret = gr_add_dma_desc(ep, req, 0, 0, gfp_flags);
> + if (ret)
> + goto alloc_err;
> + }
> +
> + /*
> + * For IN packets we only want to know when the last packet has been
> + * transmitted (not just put into internal buffers).
> + */
> + req->last_desc->ctrl |= GR_DESC_IN_CTRL_PI;
> +
> + return 0;
> +
> +alloc_err:
> + gr_free_dma_desc_chain(ep->dev, req);
> +
> + return ret;
> +}
> +
> +/* Must be called with dev->lock held */
> +static int gr_queue(struct gr_ep *ep, struct gr_request *req, gfp_t
> gfp_flags)
> +{
> + struct gr_udc *dev = ep->dev;
> + int ret;
> +
> + if (unlikely(!ep->ep.desc && ep->num != 0)) {
> + dev_err(dev->dev, "No ep descriptor for %s\n", ep->ep.name);
> + return -EINVAL;
> + }
> +
> + if (unlikely(!req->req.buf || !list_empty(&req->queue))) {
> + dev_err(dev->dev,
> + "Invalid request for %s: buf=%p list_empty=%d\n",
> + ep->ep.name, req->req.buf, list_empty(&req->queue));
> + return -EINVAL;
> + }
> +
> + /*
> + * The DMA controller can not handle smaller OUT buffers than
> + * maxpacket. It could lead to buffer overruns if unexpectedly long
> + * packet are received.
> + */
> + if (!ep->is_in && (req->req.length % ep->ep.maxpacket) != 0) {
> + dev_err(dev->dev,
> + "OUT request length %d is not multiple of maxpacket\n",
> + req->req.length);
> + return -EMSGSIZE;
> + }
> +
> + if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
> + dev_err(dev->dev, "-ESHUTDOWN");
> + return -ESHUTDOWN;
> + }
> +
> + /* Can't touch registers when suspended */
> + if (dev->ep0state == GR_EP0_SUSPEND) {
> + dev_err(dev->dev, "-EBUSY");
> + return -EBUSY;
> + }
> +
> + /* Set up DMA mapping in case the caller didn't */
> + ret = usb_gadget_map_request(&dev->gadget, &req->req, ep->is_in);
> + if (ret) {
> + dev_err(dev->dev, "usb_gadget_map_request");
> + return ret;
> + }
> +
> + if (ep->is_in)
> + ret = gr_setup_in_desc_list(ep, req, gfp_flags);
> + else
> + ret = gr_setup_out_desc_list(ep, req, gfp_flags);
> + if (ret)
> + return ret;
> +
> + req->req.status = -EINPROGRESS;
> + req->req.actual = 0;
> + list_add_tail(&req->queue, &ep->queue);
> +
> + /* Start DMA if not started, otherwise work handler handles it */
> + if (!ep->dma_start && likely(!ep->stopped))
> + gr_start_dma(ep);
> +
> + return 0;
> +}
> +
> +/*
> + * Queue a request from within the driver.
> + *
> + * Must be called with dev->lock held.
> + */
> +static inline int gr_queue_int(struct gr_ep *ep, struct gr_request *req,
> + gfp_t gfp_flags)
> +{
> + if (ep->is_in)
> + gr_dbgprint_request("RESP", ep, req);
> +
> + return gr_queue(ep, req, gfp_flags);
> +}
> +
> +/* ---------------------------------------------------------------------- */
> +/* General helper functions */
> +
> +/*
> + * Dequeue ALL requests.
> + *
> + * Must be called with dev->lock held.
> + */
> +static void gr_ep_nuke(struct gr_ep *ep)
> +{
> + struct gr_request *req;
> + struct gr_udc *dev;
> +
> + dev = ep->dev;
> +
> + ep->stopped = 1;
> + ep->dma_start = 0;
> + gr_abort_dma(ep);
> +
> + while (!list_empty(&ep->queue)) {
> + req = list_first_entry(&ep->queue, struct gr_request, queue);
> + gr_finish_request(ep, req, -ESHUTDOWN);
> + }
> +}
> +
> +/*
> + * Reset the hardware state of this endpoint.
> + *
> + * Must be called with dev->lock held.
> + */
> +static void gr_ep_reset(struct gr_ep *ep)
> +{
> + gr_write32(&ep->regs->epctrl, 0);
> + gr_write32(&ep->regs->dmactrl, 0);
> +
> + ep->ep.maxpacket = MAX_CTRL_PL_SIZE;
> + ep->ep.desc = NULL;
> + ep->stopped = 1;
> + ep->dma_start = 0;
> +}
> +
> +/*
> + * Generate STALL on ep0in/out.
> + *
> + * Must be called with dev->lock held.
> + */
> +static void gr_control_stall(struct gr_udc *dev)
> +{
> + u32 epctrl;
> +
> + epctrl = gr_read32(&dev->epo[0].regs->epctrl);
> + gr_write32(&dev->epo[0].regs->epctrl, epctrl | GR_EPCTRL_CS);
> + epctrl = gr_read32(&dev->epi[0].regs->epctrl);
> + gr_write32(&dev->epi[0].regs->epctrl, epctrl | GR_EPCTRL_CS);
> +
> + dev->ep0state = GR_EP0_STALL;
> +}
> +
> +/*
> + * Halts, halts and wedges, or clears halt for an endpoint.
> + *
> + * Must be called with dev->lock held.
> + */
> +static int gr_ep_halt_wedge(struct gr_ep *ep, int halt, int wedge, int
> fromhost)
> +{
> + u32 epctrl;
> + int retval = 0;
> +
> + if (ep->num && !ep->ep.desc)
> + return -EINVAL;
> +
> + if (ep->num && ep->ep.desc->bmAttributes == USB_ENDPOINT_XFER_ISOC)
> + return -EOPNOTSUPP;
> +
> + /* Never actually halt ep0, and therefore never clear halt for ep0 */
> + if (!ep->num) {
> + if (halt && !fromhost) {
> + /* ep0 halt from gadget - generate protocol stall */
> + gr_control_stall(ep->dev);
> + DBG("EP: stall ep0\n");
> + return 0;
> + }
> + return -EINVAL;
> + }
> +
> + DBG("EP: %s halt %s\n", (halt ? (wedge ? "wedge" : "set") : "clear"),
> + ep->ep.name);
dev_dbg()
> + epctrl = gr_read32(&ep->regs->epctrl);
> + if (halt) {
> + /* Set HALT */
> + gr_write32(&ep->regs->epctrl, epctrl | GR_EPCTRL_EH);
> + ep->stopped = 1;
> + if (wedge)
> + ep->wedged = 1;
> + } else {
> + gr_write32(&ep->regs->epctrl, epctrl & ~GR_EPCTRL_EH);
> + ep->stopped = 0;
> + ep->wedged = 0;
> +
> + /* Things might have been queued up in the meantime */
> + if (!ep->dma_start)
> + gr_start_dma(ep);
> +
> + /* Ep handling might have been hindered during halt */
> + schedule_work(&ep->dev->work);
> + }
> +
> + return retval;
> +}
> +
> +/* Must be called with dev->lock held */
> +static inline void gr_set_ep0state(struct gr_udc *dev, enum gr_ep0state
> value)
> +{
> + if (dev->ep0state != value)
> + VDBG("STATE: ep0state=%s\n",
> + gr_ep0state_string(value));
dev_vdbg()
> + dev->ep0state = value;
> +}
> +
> +/*
> + * Should only be called when endpoints can not generate interrupts.
> + *
> + * Must be called with dev->lock held.
> + */
> +static void gr_disable_interrupts_and_pullup(struct gr_udc *dev)
> +{
> + gr_write32(&dev->regs->control, 0);
> + wmb(); /* Make sure that we do not deny one of our interrupts */
> + dev->irq_enabled = 0;
> +}
> +
> +/*
> + * Stop all device activity and disable data line pullup.
> + *
> + * Must be called with dev->lock held.
> + */
> +static void gr_stop_activity(struct gr_udc *dev)
> +{
> + struct gr_ep *ep;
> +
> + list_for_each_entry(ep, &dev->ep_list, ep_list)
> + gr_ep_nuke(ep);
> +
> + gr_disable_interrupts_and_pullup(dev);
> +
> + gr_set_ep0state(dev, GR_EP0_DISCONNECT);
> + usb_gadget_set_state(&dev->gadget, USB_STATE_ATTACHED);
ATTACHED ??
> +}
> +
> +/* ---------------------------------------------------------------------- */
> +/* ep0 setup packet handling */
> +
> +static void gr_ep0_testmode_complete(struct usb_ep *_ep,
> + struct usb_request *_req)
> +{
> + struct gr_ep *ep;
> + struct gr_udc *dev;
> + u32 control;
> +
> + ep = container_of(_ep, struct gr_ep, ep);
> + dev = ep->dev;
> +
> + spin_lock(&dev->lock);
> +
> + control = gr_read32(&dev->regs->control);
> + control |= GR_CONTROL_TM | (dev->test_mode << GR_CONTROL_TS_POS);
> + gr_write32(&dev->regs->control, control);
> +
> + spin_unlock(&dev->lock);
> +}
> +
> +static void gr_ep0_dummy_complete(struct usb_ep *_ep, struct usb_request
> *_req)
> +{
> + /* Nothing needs to be done here */
> +}
> +
> +/*
> + * Queue a response on ep0in.
> + *
> + * Must be called with dev->lock held.
> + */
> +static int gr_ep0_respond(struct gr_udc *dev, u8 *buf, int length,
> + void (*complete)(struct usb_ep *ep,
> + struct usb_request *req))
> +{
> + u8 *reqbuf = dev->ep0reqi->req.buf;
> + int status;
> + int i;
> +
> + for (i = 0; i < length; i++)
> + reqbuf[i] = buf[i];
> + dev->ep0reqi->req.length = length;
> + dev->ep0reqi->req.complete = complete;
> +
> + status = gr_queue_int(&dev->epi[0], dev->ep0reqi, GFP_ATOMIC);
> + if (status < 0)
> + dev_err(dev->dev,
> + "Could not queue ep0in setup response: %d\n", status);
> +
> + return status;
> +}
> +
> +/*
> + * Queue a 2 byte response on ep0in.
> + *
> + * Must be called with dev->lock held.
> + */
> +static inline int gr_ep0_respond_u16(struct gr_udc *dev, u16 response)
> +{
> + __le16 le_response = cpu_to_le16(response);
> +
> + return gr_ep0_respond(dev, (u8 *)&le_response, 2,
> + gr_ep0_dummy_complete);
> +}
> +
> +/*
> + * Queue a ZLP response on ep0in.
> + *
> + * Must be called with dev->lock held.
> + */
> +static inline int gr_ep0_respond_empty(struct gr_udc *dev)
> +{
> + return gr_ep0_respond(dev, NULL, 0, gr_ep0_dummy_complete);
> +}
> +
> +/*
> + * This is run when a SET_ADDRESS request is received. First writes
> + * the new address to the control register which is updated internally
> + * when the next IN packet is ACKED.
> + *
> + * Must be called with dev->lock held.
> + */
> +static void gr_set_address(struct gr_udc *dev, u8 address)
> +{
> + u32 control;
> +
> + control = gr_read32(&dev->regs->control) & ~GR_CONTROL_UA_MASK;
> + control |= (address << GR_CONTROL_UA_POS) & GR_CONTROL_UA_MASK;
> + control |= GR_CONTROL_SU;
> + gr_write32(&dev->regs->control, control);
> +}
> +
> +/*
> + * Returns negative for STALL, 0 for successful handling and positive for
> + * delegation.
> + *
> + * Must be called with dev->lock held.
> + */
> +static int gr_device_request(struct gr_udc *dev, u8 type, u8 request,
> + u16 value, u16 index)
> +{
> + u16 response;
> + u8 test;
> +
> + switch (request) {
> + case USB_REQ_SET_ADDRESS:
> + DBG("STATUS: address %d\n", value & 0xff);
> + gr_set_address(dev, value & 0xff);
> + if (value)
> + usb_gadget_set_state(&dev->gadget, USB_STATE_ADDRESS);
> + else
> + usb_gadget_set_state(&dev->gadget, USB_STATE_DEFAULT);
> + return gr_ep0_respond_empty(dev);
> +
> + case USB_REQ_GET_STATUS:
> + /* Self powered | remote wakeup */
> + response = 0x0001 | (dev->remote_wakeup ? 0x0002 : 0);
> + return gr_ep0_respond_u16(dev, response);
> +
> + case USB_REQ_SET_FEATURE:
> + switch (value) {
> + case USB_DEVICE_REMOTE_WAKEUP:
> + /* Allow remote wakeup */
> + dev->remote_wakeup = 1;
> + return gr_ep0_respond_empty(dev);
> +
> + case USB_DEVICE_TEST_MODE:
> + /* The hardware does not support TEST_FORCE_EN */
> + test = index >> 8;
> + if (test >= TEST_J && test <= TEST_PACKET) {
> + dev->test_mode = test;
> + return gr_ep0_respond(dev, NULL, 0,
> + gr_ep0_testmode_complete);
> + }
> + }
> + break;
> +
> + case USB_REQ_CLEAR_FEATURE:
> + switch (value) {
> + case USB_DEVICE_REMOTE_WAKEUP:
> + /* Disallow remote wakeup */
> + dev->remote_wakeup = 0;
> + return gr_ep0_respond_empty(dev);
> + }
> + break;
> + }
> +
> + return 1; /* Delegate the rest */
> +}
> +
> +/*
> + * Returns negative for STALL, 0 for successful handling and positive for
> + * delegation.
> + *
> + * Must be called with dev->lock held.
> + */
> +static int gr_interface_request(struct gr_udc *dev, u8 type, u8 request,
> + u16 value, u16 index)
> +{
> + if (dev->gadget.state != USB_STATE_CONFIGURED)
> + return -1;
> +
> + /*
> + * Should return STALL for invalid interfaces, but udc driver does not
> + * know anything about that. However, many gadget drivers do not handle
> + * GET_STATUS so we need to take care of that.
> + */
> +
> + switch (request) {
> + case USB_REQ_GET_STATUS:
> + return gr_ep0_respond_u16(dev, 0x0000);
> +
> + case USB_REQ_SET_FEATURE:
> + case USB_REQ_CLEAR_FEATURE:
> + /*
> + * No possible valid standard requests. Still let gadget drivers
> + * have a go at it.
> + */
> + break;
> + }
> +
> + return 1; /* Delegate the rest */
> +}
> +
> +/*
> + * Returns negative for STALL, 0 for successful handling and positive for
> + * delegation.
> + *
> + * Must be called with dev->lock held.
> + */
> +static int gr_endpoint_request(struct gr_udc *dev, u8 type, u8 request,
> + u16 value, u16 index)
> +{
> + struct gr_ep *ep;
> + int status;
> + int halted;
> + u8 epnum = index & USB_ENDPOINT_NUMBER_MASK;
> + u8 is_in = index & USB_ENDPOINT_DIR_MASK;
> +
> + if ((is_in && epnum >= dev->nepi) || (!is_in && epnum >= dev->nepo))
> + return -1;
> +
> + if (dev->gadget.state != USB_STATE_CONFIGURED && epnum != 0)
> + return -1;
> +
> + ep = (is_in ? &dev->epi[epnum] : &dev->epo[epnum]);
> +
> + switch (request) {
> + case USB_REQ_GET_STATUS:
> + halted = gr_read32(&ep->regs->epctrl) & GR_EPCTRL_EH;
> + return gr_ep0_respond_u16(dev, halted ? 0x0001 : 0);
> +
> + case USB_REQ_SET_FEATURE:
> + switch (value) {
> + case USB_ENDPOINT_HALT:
> + status = gr_ep_halt_wedge(ep, 1, 0, 1);
> + if (status >= 0)
> + status = gr_ep0_respond_empty(dev);
> + return status;
> + }
> + break;
> +
> + case USB_REQ_CLEAR_FEATURE:
> + switch (value) {
> + case USB_ENDPOINT_HALT:
> + if (ep->wedged)
> + return -1;
> + status = gr_ep_halt_wedge(ep, 0, 0, 1);
> + if (status >= 0)
> + status = gr_ep0_respond_empty(dev);
> + return status;
> + }
> + break;
> + }
> +
> + return 1; /* Delegate the rest */
> +}
> +
> +/* Must be called with dev->lock held */
> +static void gr_ep0out_requeue(struct gr_udc *dev)
> +{
> + int ret = gr_queue_int(&dev->epo[0], dev->ep0reqo, GFP_ATOMIC);
> +
> + if (ret)
> + dev_err(dev->dev, "Could not queue ep0out setup request: %d\n",
> + ret);
> +}
> +
> +/*
> + * The main function dealing with setup requests on ep0.
> + *
> + * Must be called with dev->lock held.
> + */
> +static void gr_ep0_setup(struct gr_udc *dev, struct gr_request *req)
> +{
> + union {
> + struct usb_ctrlrequest ctrl;
> + u8 raw[8];
> + u32 word[2];
> + } u;
> + u8 type;
> + u8 request;
> + u16 value;
> + u16 index;
> + u16 length;
> + int i;
> + int status;
> +
> + /* Restore from ep0 halt */
> + if (dev->ep0state == GR_EP0_STALL) {
> + gr_set_ep0state(dev, GR_EP0_SETUP);
> + if (!req->req.actual)
> + goto out;
> + }
> +
> + if (dev->ep0state == GR_EP0_ISTATUS) {
> + gr_set_ep0state(dev, GR_EP0_SETUP);
> + if (req->req.actual > 0)
> + DBG("Unexpected setup packet at state %s\n",
> + gr_ep0state_string(GR_EP0_ISTATUS));
> + else
> + goto out; /* Got expected ZLP */
> + } else if (dev->ep0state != GR_EP0_SETUP) {
> + INFO("Unexpected ep0out request at state %s - stalling\n",
> + gr_ep0state_string(dev->ep0state));
dev_info
> + gr_control_stall(dev);
> + gr_set_ep0state(dev, GR_EP0_SETUP);
> + goto out;
> + } else if (!req->req.actual) {
> + DBG("Unexpected ZLP at state %s\n",
> + gr_ep0state_string(dev->ep0state));
dev_dbg()
> + goto out;
> + }
> +
> + /* Handle SETUP packet */
> + for (i = 0; i < req->req.actual; i++)
> + u.raw[i] = ((u8 *)req->req.buf)[i];
> +
> + type = u.ctrl.bRequestType;
> + request = u.ctrl.bRequest;
> + value = le16_to_cpu(u.ctrl.wValue);
> + index = le16_to_cpu(u.ctrl.wIndex);
> + length = le16_to_cpu(u.ctrl.wLength);
> +
> + gr_dbgprint_devreq(type, request, value, index, length);
> +
> + /* Check for data stage */
> + if (length) {
> + if (type & USB_DIR_IN)
> + gr_set_ep0state(dev, GR_EP0_IDATA);
> + else
> + gr_set_ep0state(dev, GR_EP0_ODATA);
> + }
> +
> + status = 1; /* Positive status flags delegation */
> + if ((type & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
> + switch (type & USB_RECIP_MASK) {
> + case USB_RECIP_DEVICE:
> + status = gr_device_request(dev, type, request,
> + value, index);
> + break;
> + case USB_RECIP_ENDPOINT:
> + status = gr_endpoint_request(dev, type, request,
> + value, index);
> + break;
> + case USB_RECIP_INTERFACE:
> + status = gr_interface_request(dev, type, request,
> + value, index);
> + break;
> + }
> + }
> +
> + if (status > 0) {
> + /* Delegate the rest to the gadget driver */
> + spin_unlock(&dev->lock);
> +
> + VDBG("DELEGATE\n");
> + status = dev->driver->setup(&dev->gadget, &u.ctrl);
> +
> + spin_lock(&dev->lock);
> + }
> +
> + /* Generate STALL on both ep0out and ep0in if requested */
> + if (unlikely(status < 0)) {
> + VDBG("STALL\n");
> + gr_control_stall(dev);
> + }
> +
> + if ((type & USB_TYPE_MASK) == USB_TYPE_STANDARD &&
> + request == USB_REQ_SET_CONFIGURATION) {
> + if (!value) {
> + DBG("STATUS: deconfigured\n");
> + usb_gadget_set_state(&dev->gadget, USB_STATE_ADDRESS);
> + } else if (status >= 0) {
> + /* Not configured unless gadget OK:s it */
> + DBG("STATUS: configured: %d\n", value);
> + usb_gadget_set_state(&dev->gadget,
> + USB_STATE_CONFIGURED);
> + }
> + }
> +
> + /* Get ready for next stage */
> + if (dev->ep0state == GR_EP0_ODATA)
> + gr_set_ep0state(dev, GR_EP0_OSTATUS);
> + else if (dev->ep0state == GR_EP0_IDATA)
> + gr_set_ep0state(dev, GR_EP0_ISTATUS);
> + else
> + gr_set_ep0state(dev, GR_EP0_SETUP);
> +
> +out:
> + gr_ep0out_requeue(dev);
> +}
> +
> +/* ---------------------------------------------------------------------- */
> +/* VBUS and USB reset handling */
> +
> +/* Must be called with dev->lock held */
> +static void gr_vbus_connected(struct gr_udc *dev, u32 status)
> +{
> + u32 control;
> +
> + dev->gadget.speed = GR_SPEED(status);
> + usb_gadget_set_state(&dev->gadget, USB_STATE_POWERED);
> +
> + /* Turn on full interrupts and pullup */
> + control = (GR_CONTROL_SI | GR_CONTROL_UI | GR_CONTROL_VI |
> + GR_CONTROL_SP | GR_CONTROL_EP);
> + gr_write32(&dev->regs->control, control);
> +}
> +
> +/* Must be called with dev->lock held */
> +static void gr_enable_vbus_detect(struct gr_udc *dev)
> +{
> + u32 status;
> +
> + dev->irq_enabled = 1;
> + wmb(); /* Make sure we do not ignore an interrupt */
> + gr_write32(&dev->regs->control, GR_CONTROL_VI);
> +
> + /* Take care of the case we are already plugged in at this point */
> + status = gr_read32(&dev->regs->status);
> + if (status & GR_STATUS_VB)
> + gr_vbus_connected(dev, status);
> +}
> +
> +/* Must be called with dev->lock held */
> +static void gr_vbus_disconnected(struct gr_udc *dev)
> +{
> + gr_stop_activity(dev);
> +
> + /* Report disconnect */
> + if (dev->driver && dev->driver->disconnect) {
> + spin_unlock(&dev->lock);
> +
> + dev->driver->disconnect(&dev->gadget);
> +
> + spin_lock(&dev->lock);
> + }
> +
> + gr_enable_vbus_detect(dev);
> +}
> +
> +/* Must be called with dev->lock held */
> +static void gr_udc_usbreset(struct gr_udc *dev, u32 status)
> +{
> + gr_set_address(dev, 0);
> + gr_set_ep0state(dev, GR_EP0_SETUP);
> + usb_gadget_set_state(&dev->gadget, USB_STATE_DEFAULT);
> + dev->gadget.speed = GR_SPEED(status);
> +
> + gr_ep_nuke(&dev->epo[0]);
> + gr_ep_nuke(&dev->epi[0]);
> + dev->epo[0].stopped = 0;
> + dev->epi[0].stopped = 0;
> + gr_ep0out_requeue(dev);
> +}
> +
> +/* ---------------------------------------------------------------------- */
> +/* Irq and work handling */
> +
> +/*
> + * Handles wq work for in endpoints. Returns whether work was handled.
> + *
> + * Must be called with dev->lock held and with !ep->stopped.
> + */
> +static int gr_handle_in_ep_work(struct gr_ep *ep)
> +{
> + struct gr_request *req;
> +
> + req = list_first_entry(&ep->queue, struct gr_request, queue);
> + if (!req->last_desc)
> + return 0;
> +
> + if (gr_read32(&req->last_desc->ctrl) & GR_DESC_IN_CTRL_EN)
> + return 0; /* Not put in hardware buffers yet */
> +
> + if (gr_read32(&ep->regs->epstat) & (GR_EPSTAT_B1 | GR_EPSTAT_B0))
> + return 0; /* Not transmitted yet, still in hardware buffers */
> +
> + /* Write complete */
> + gr_dma_advance(ep, 0);
> +
> + return 1;
> +}
> +
> +/*
> + * Handles wq work for out endpoints. Returns whether work was handled.
> + *
> + * Must be called with dev->lock held and with !ep->stopped.
> + */
> +static int gr_handle_out_ep_work(struct gr_ep *ep)
> +{
> + u32 ep_dmactrl;
> + u32 ctrl;
> + u16 len;
> + struct gr_request *req;
> + struct gr_udc *dev = ep->dev;
> +
> + req = list_first_entry(&ep->queue, struct gr_request, queue);
> + if (!req->curr_desc)
> + return 0;
> +
> + ctrl = gr_read32(&req->curr_desc->ctrl);
> + if (ctrl & GR_DESC_OUT_CTRL_EN)
> + return 0; /* Not received yet */
> +
> + /* Read complete */
> + len = ctrl & GR_DESC_OUT_CTRL_LEN_MASK;
> + req->req.actual += len;
> + if (ctrl & GR_DESC_OUT_CTRL_SE)
> + req->setup = 1;
> +
> + if (len < ep->ep.maxpacket || req->req.actual == req->req.length) {
> + /* Short packet or the expected size - we are done */
> +
> + if ((ep == &dev->epo[0]) && (dev->ep0state == GR_EP0_OSTATUS)) {
> + /*
> + * Send a status stage ZLP to ack the DATA stage in the
> + * OUT direction. This needs to be done before
> + * gr_dma_advance as that can lead to a call to
> + * ep0_setup that can change dev->ep0state.
> + */
> + gr_ep0_respond_empty(dev);
> + gr_set_ep0state(dev, GR_EP0_SETUP);
> + }
> +
> + gr_dma_advance(ep, 0);
> + } else {
> + /* Not done yet. Enable the next descriptor to receive more. */
> + req->curr_desc = req->curr_desc->next_desc;
> + req->curr_desc->ctrl |= GR_DESC_OUT_CTRL_EN;
> +
> + ep_dmactrl = gr_read32(&ep->regs->dmactrl);
> + gr_write32(&ep->regs->dmactrl, ep_dmactrl | GR_DMACTRL_DA);
> + }
> +
> + return 1;
> +}
> +
> +/*
> + * Handle state changes. Returns whether work was handled.
> + *
> + * Must be called with dev->lock held.
> + */
> +static int gr_handle_state_work(struct gr_udc *dev)
> +{
> + u32 status = gr_read32(&dev->regs->status);
> + int handled = 0;
> + int powstate = !(dev->gadget.state == USB_STATE_NOTATTACHED ||
> + dev->gadget.state == USB_STATE_ATTACHED);
> +
> + /* VBUS valid detected */
> + if (!powstate && (status & GR_STATUS_VB)) {
> + DBG("STATUS: vbus valid detected\n");
> + gr_vbus_connected(dev, status);
> + handled = 1;
> + }
> +
> + /* Disconnect */
> + if (powstate && !(status & GR_STATUS_VB)) {
> + DBG("STATUS: vbus invalid detected\n");
> + gr_vbus_disconnected(dev);
> + handled = 1;
> + }
> +
> + /* USB reset detected */
> + if (status & GR_STATUS_UR) {
> + DBG("STATUS: USB reset - speed is %s\n", GR_SPEED_STR(status));
> + gr_write32(&dev->regs->status, GR_STATUS_UR);
> + gr_udc_usbreset(dev, status);
> + handled = 1;
> + }
> +
> + /* Speed change */
> + if (dev->gadget.speed != GR_SPEED(status)) {
> + DBG("STATUS: USB Speed change to %s\n", GR_SPEED_STR(status));
> + dev->gadget.speed = GR_SPEED(status);
> + handled = 1;
> + }
> +
> + /* Going into suspend */
> + if ((dev->ep0state != GR_EP0_SUSPEND) && !(status & GR_STATUS_SU)) {
> + DBG("STATUS: USB suspend\n");
> + gr_set_ep0state(dev, GR_EP0_SUSPEND);
> + dev->suspended_from = dev->gadget.state;
> + usb_gadget_set_state(&dev->gadget, USB_STATE_SUSPENDED);
> +
> + if ((dev->gadget.speed != USB_SPEED_UNKNOWN) &&
> + dev->driver && dev->driver->suspend) {
> + spin_unlock(&dev->lock);
> +
> + dev->driver->suspend(&dev->gadget);
> +
> + spin_lock(&dev->lock);
> + }
> + handled = 1;
> + }
> +
> + /* Coming out of suspend */
> + if ((dev->ep0state == GR_EP0_SUSPEND) && (status & GR_STATUS_SU)) {
> + DBG("STATUS: USB resume\n");
> + if (dev->suspended_from == USB_STATE_POWERED)
> + gr_set_ep0state(dev, GR_EP0_DISCONNECT);
> + else
> + gr_set_ep0state(dev, GR_EP0_SETUP);
> + usb_gadget_set_state(&dev->gadget, dev->suspended_from);
> +
> + if ((dev->gadget.speed != USB_SPEED_UNKNOWN) &&
> + dev->driver && dev->driver->resume) {
> + spin_unlock(&dev->lock);
> +
> + dev->driver->resume(&dev->gadget);
> +
> + spin_lock(&dev->lock);
> + }
> + handled = 1;
> + }
> +
> + return handled;
> +}
> +
> +static void gr_work(struct work_struct *work)
> +{
> + struct gr_udc *dev = container_of(work, struct gr_udc, work);
> + struct gr_ep *ep;
> + int handled = 0;
> + int i;
> +
> + spin_lock(&dev->lock);
> +
> + if (!dev->irq_enabled)
> + goto out;
> +
> + /*
> + * Check IN ep interrupts. We check these before the OUT eps because
> + * some gadgets reuse the request that might already be currently
> + * outstanding and needs to be completed (mainly setup requests).
> + */
> + for (i = 0; i < dev->nepi; i++) {
> + ep = &dev->epi[i];
> + if (!ep->stopped && !ep->callback && !list_empty(&ep->queue))
> + handled = gr_handle_in_ep_work(ep) || handled;
> + }
> +
> + /* Check OUT ep interrupts */
> + for (i = 0; i < dev->nepo; i++) {
> + ep = &dev->epo[i];
> + if (!ep->stopped && !ep->callback && !list_empty(&ep->queue))
> + handled = gr_handle_out_ep_work(ep) || handled;
> + }
> +
> + /* Check status interrupts */
> + handled = gr_handle_state_work(dev) || handled;
> +
> +
> + /*
> + * Check AMBA DMA errors. Only check if we didn't find anything else to
> + * handle because this shouldn't happen if we did everything right.
> + */
> + if (!handled) {
> + list_for_each_entry(ep, &dev->ep_list, ep_list) {
> + if (gr_read32(&ep->regs->dmactrl) & GR_DMACTRL_AE) {
> + dev_err(dev->dev, "AMBA Error occurred for
> %s\n",
> + ep->ep.name);
> + handled = 1;
> + }
> + }
> + }
> +
> +out:
> + spin_unlock(&dev->lock);
> +}
> +
> +/* The interrupt handler just triggers the work handler */
> +static irqreturn_t gr_irq(int irq, void *_dev)
> +{
> + struct gr_udc *dev = _dev;
> +
> + if (!dev->irq_enabled)
> + return IRQ_NONE;
> +
> + schedule_work(&dev->work);
why do you need this ? We have threaded IRQ handlers. Why a workqueue ?
--
balbi
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