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 <andreas@xxxxxxxxxxx> > + * - 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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