| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * 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: |
| * https://www.gaisler.com/products/grlib/grip.pdf |
| * |
| * Contributors: |
| * - Andreas Larsson <andreas@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/list.h> |
| #include <linux/interrupt.h> |
| #include <linux/device.h> |
| #include <linux/usb.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 <linux/of_platform.h> |
| #include <linux/of_irq.h> |
| #include <linux/of_address.h> |
| |
| #include <asm/byteorder.h> |
| |
| #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; |
| |
| #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 |
| |
| static void gr_dbgprint_request(const char *str, struct gr_ep *ep, |
| struct gr_request *req) |
| { |
| int buflen = ep->is_in ? req->req.length : req->req.actual; |
| int rowlen = 32; |
| int plen = min(rowlen, buflen); |
| |
| dev_dbg(ep->dev->dev, "%s: 0x%p, %d bytes data%s:\n", str, req, buflen, |
| (buflen > plen ? " (truncated)" : "")); |
| print_hex_dump_debug(" ", DUMP_PREFIX_NONE, |
| rowlen, 4, req->req.buf, plen, false); |
| } |
| |
| static void gr_dbgprint_devreq(struct gr_udc *dev, u8 type, u8 request, |
| u16 value, u16 index, u16 length) |
| { |
| dev_vdbg(dev->dev, "REQ: %02x.%02x v%04x i%04x l%04x\n", |
| type, request, value, index, length); |
| } |
| #else /* !VERBOSE_DEBUG */ |
| |
| static void gr_dbgprint_request(const char *str, struct gr_ep *ep, |
| struct gr_request *req) {} |
| |
| static void gr_dbgprint_devreq(struct gr_udc *dev, u8 type, u8 request, |
| u16 value, u16 index, u16 length) {} |
| |
| #endif /* VERBOSE_DEBUG */ |
| |
| /* ---------------------------------------------------------------------- */ |
| /* Debugfs functionality */ |
| |
| #ifdef CONFIG_USB_GADGET_DEBUG_FS |
| |
| static void gr_seq_ep_show(struct seq_file *seq, struct gr_ep *ep) |
| { |
| u32 epctrl = gr_read32(&ep->regs->epctrl); |
| u32 epstat = gr_read32(&ep->regs->epstat); |
| int mode = (epctrl & GR_EPCTRL_TT_MASK) >> GR_EPCTRL_TT_POS; |
| struct gr_request *req; |
| |
| seq_printf(seq, "%s:\n", ep->ep.name); |
| seq_printf(seq, " mode = %s\n", gr_modestring[mode]); |
| seq_printf(seq, " halted: %d\n", !!(epctrl & GR_EPCTRL_EH)); |
| seq_printf(seq, " disabled: %d\n", !!(epctrl & GR_EPCTRL_ED)); |
| seq_printf(seq, " valid: %d\n", !!(epctrl & GR_EPCTRL_EV)); |
| seq_printf(seq, " dma_start = %d\n", ep->dma_start); |
| seq_printf(seq, " stopped = %d\n", ep->stopped); |
| seq_printf(seq, " wedged = %d\n", ep->wedged); |
| seq_printf(seq, " callback = %d\n", ep->callback); |
| seq_printf(seq, " maxpacket = %d\n", ep->ep.maxpacket); |
| seq_printf(seq, " maxpacket_limit = %d\n", ep->ep.maxpacket_limit); |
| seq_printf(seq, " bytes_per_buffer = %d\n", ep->bytes_per_buffer); |
| if (mode == 1 || mode == 3) |
| seq_printf(seq, " nt = %d\n", |
| (epctrl & GR_EPCTRL_NT_MASK) >> GR_EPCTRL_NT_POS); |
| |
| seq_printf(seq, " Buffer 0: %s %s%d\n", |
| epstat & GR_EPSTAT_B0 ? "valid" : "invalid", |
| epstat & GR_EPSTAT_BS ? " " : "selected ", |
| (epstat & GR_EPSTAT_B0CNT_MASK) >> GR_EPSTAT_B0CNT_POS); |
| seq_printf(seq, " Buffer 1: %s %s%d\n", |
| epstat & GR_EPSTAT_B1 ? "valid" : "invalid", |
| epstat & GR_EPSTAT_BS ? "selected " : " ", |
| (epstat & GR_EPSTAT_B1CNT_MASK) >> GR_EPSTAT_B1CNT_POS); |
| |
| if (list_empty(&ep->queue)) { |
| seq_puts(seq, " Queue: empty\n\n"); |
| return; |
| } |
| |
| seq_puts(seq, " Queue:\n"); |
| list_for_each_entry(req, &ep->queue, queue) { |
| struct gr_dma_desc *desc; |
| struct gr_dma_desc *next; |
| |
| seq_printf(seq, " 0x%p: 0x%p %d %d\n", req, |
| &req->req.buf, req->req.actual, req->req.length); |
| |
| next = req->first_desc; |
| do { |
| desc = next; |
| next = desc->next_desc; |
| seq_printf(seq, " %c 0x%p (0x%08x): 0x%05x 0x%08x\n", |
| desc == req->curr_desc ? 'c' : ' ', |
| desc, desc->paddr, desc->ctrl, desc->data); |
| } while (desc != req->last_desc); |
| } |
| seq_puts(seq, "\n"); |
| } |
| |
| static int gr_dfs_show(struct seq_file *seq, void *v) |
| { |
| struct gr_udc *dev = seq->private; |
| u32 control = gr_read32(&dev->regs->control); |
| u32 status = gr_read32(&dev->regs->status); |
| struct gr_ep *ep; |
| |
| seq_printf(seq, "usb state = %s\n", |
| usb_state_string(dev->gadget.state)); |
| seq_printf(seq, "address = %d\n", |
| (control & GR_CONTROL_UA_MASK) >> GR_CONTROL_UA_POS); |
| seq_printf(seq, "speed = %s\n", GR_SPEED_STR(status)); |
| seq_printf(seq, "ep0state = %s\n", gr_ep0state_string(dev->ep0state)); |
| seq_printf(seq, "irq_enabled = %d\n", dev->irq_enabled); |
| seq_printf(seq, "remote_wakeup = %d\n", dev->remote_wakeup); |
| seq_printf(seq, "test_mode = %d\n", dev->test_mode); |
| seq_puts(seq, "\n"); |
| |
| list_for_each_entry(ep, &dev->ep_list, ep_list) |
| gr_seq_ep_show(seq, ep); |
| |
| return 0; |
| } |
| DEFINE_SHOW_ATTRIBUTE(gr_dfs); |
| |
| static void gr_dfs_create(struct gr_udc *dev) |
| { |
| const char *name = "gr_udc_state"; |
| struct dentry *root; |
| |
| root = debugfs_create_dir(dev_name(dev->dev), usb_debug_root); |
| debugfs_create_file(name, 0444, root, dev, &gr_dfs_fops); |
| } |
| |
| static void gr_dfs_delete(struct gr_udc *dev) |
| { |
| debugfs_remove(debugfs_lookup(dev_name(dev->dev), usb_debug_root)); |
| } |
| |
| #else /* !CONFIG_USB_GADGET_DEBUG_FS */ |
| |
| static void gr_dfs_create(struct gr_udc *dev) {} |
| static void gr_dfs_delete(struct gr_udc *dev) {} |
| |
| #endif /* CONFIG_USB_GADGET_DEBUG_FS */ |
| |
| /* ---------------------------------------------------------------------- */ |
| /* DMA and request handling */ |
| |
| /* Allocates a new struct gr_dma_desc, sets paddr and zeroes the rest */ |
| static struct gr_dma_desc *gr_alloc_dma_desc(struct gr_ep *ep, gfp_t gfp_flags) |
| { |
| dma_addr_t paddr; |
| struct gr_dma_desc *dma_desc; |
| |
| dma_desc = dma_pool_zalloc(ep->dev->desc_pool, gfp_flags, &paddr); |
| if (!dma_desc) { |
| dev_err(ep->dev->dev, "Could not allocate from DMA pool\n"); |
| return NULL; |
| } |
| |
| dma_desc->paddr = paddr; |
| |
| return dma_desc; |
| } |
| |
| static inline void gr_free_dma_desc(struct gr_udc *dev, |
| struct gr_dma_desc *desc) |
| { |
| dma_pool_free(dev->desc_pool, desc, (dma_addr_t)desc->paddr); |
| } |
| |
| /* Frees the chain of struct gr_dma_desc for the given request */ |
| static void gr_free_dma_desc_chain(struct gr_udc *dev, struct gr_request *req) |
| { |
| struct gr_dma_desc *desc; |
| struct gr_dma_desc *next; |
| |
| next = req->first_desc; |
| if (!next) |
| return; |
| |
| do { |
| desc = next; |
| next = desc->next_desc; |
| gr_free_dma_desc(dev, desc); |
| } while (desc != req->last_desc); |
| |
| req->first_desc = NULL; |
| req->curr_desc = NULL; |
| req->last_desc = NULL; |
| } |
| |
| static void gr_ep0_setup(struct gr_udc *dev, struct gr_request *req); |
| |
| /* |
| * Frees allocated resources and calls the appropriate completion function/setup |
| * package handler for a finished request. |
| * |
| * Must be called with dev->lock held and irqs disabled. |
| */ |
| static void gr_finish_request(struct gr_ep *ep, struct gr_request *req, |
| int status) |
| __releases(&dev->lock) |
| __acquires(&dev->lock) |
| { |
| 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, req->req.actual gets updated bit by bit */ |
| req->req.actual = req->req.length; |
| } else if (req->oddlen && req->req.actual > req->evenlen) { |
| /* |
| * Copy to user buffer in this case where length was not evenly |
| * divisible by ep->ep.maxpacket and the last descriptor was |
| * actually used. |
| */ |
| char *buftail = ((char *)req->req.buf + req->evenlen); |
| |
| memcpy(buftail, ep->tailbuf, req->oddlen); |
| |
| if (req->req.actual > req->req.length) { |
| /* We got more data than was requested */ |
| dev_dbg(ep->dev->dev, "Overflow for ep %s\n", |
| ep->ep.name); |
| gr_dbgprint_request("OVFL", ep, req); |
| req->req.status = -EOVERFLOW; |
| } |
| } |
| |
| 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) { |
| spin_unlock(&dev->lock); |
| |
| usb_gadget_giveback_request(&ep->ep, &req->req); |
| |
| spin_lock(&dev->lock); |
| } |
| ep->callback = 0; |
| } |
| |
| static struct usb_request *gr_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) |
| { |
| struct gr_request *req; |
| |
| req = kzalloc(sizeof(*req), gfp_flags); |
| if (!req) |
| return NULL; |
| |
| INIT_LIST_HEAD(&req->queue); |
| |
| return &req->req; |
| } |
| |
| /* |
| * 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); |
| |
| /* |
| * The DMA controller can not handle smaller OUT buffers than |
| * ep->ep.maxpacket. It could lead to buffer overruns if an unexpectedly |
| * long packet are received. Therefore an internal bounce buffer gets |
| * used when such a request gets enabled. |
| */ |
| if (!ep->is_in && req->oddlen) |
| req->last_desc->data = ep->tailbuf_paddr; |
| |
| 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, irqs disabled 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 |
| * interrupt 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); |
| |
| if (size < ep->bytes_per_buffer) { |
| /* Prepare using bounce buffer */ |
| req->evenlen = req->req.length - bytes_left; |
| req->oddlen = size; |
| } |
| |
| 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; |
| } |
| |
| 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 interrupt 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 and irqs disabled. |
| */ |
| static void gr_ep_nuke(struct gr_ep *ep) |
| { |
| struct gr_request *req; |
| |
| 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); |
| dev_dbg(ep->dev->dev, "EP: stall ep0\n"); |
| return 0; |
| } |
| return -EINVAL; |
| } |
| |
| dev_dbg(ep->dev->dev, "EP: %s halt %s\n", |
| (halt ? (wedge ? "wedge" : "set") : "clear"), ep->ep.name); |
| |
| 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); |
| } |
| |
| 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) |
| dev_vdbg(dev->dev, "STATE: ep0state=%s\n", |
| gr_ep0state_string(value)); |
| 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 and irqs disabled. |
| */ |
| 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_NOTATTACHED); |
| } |
| |
| /* ---------------------------------------------------------------------- */ |
| /* 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: |
| dev_dbg(dev->dev, "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 USB_TEST_FORCE_ENABLE */ |
| test = index >> 8; |
| if (test >= USB_TEST_J && test <= USB_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 and irqs disabled |
| */ |
| static void gr_ep0_setup(struct gr_udc *dev, struct gr_request *req) |
| __releases(&dev->lock) |
| __acquires(&dev->lock) |
| { |
| 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) |
| dev_dbg(dev->dev, |
| "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) { |
| dev_info(dev->dev, |
| "Unexpected ep0out request at state %s - stalling\n", |
| gr_ep0state_string(dev->ep0state)); |
| gr_control_stall(dev); |
| gr_set_ep0state(dev, GR_EP0_SETUP); |
| goto out; |
| } else if (!req->req.actual) { |
| dev_dbg(dev->dev, "Unexpected ZLP at state %s\n", |
| gr_ep0state_string(dev->ep0state)); |
| 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(dev, 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) { |
| spin_unlock(&dev->lock); |
| |
| dev_vdbg(dev->dev, "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)) { |
| dev_vdbg(dev->dev, "STALL\n"); |
| gr_control_stall(dev); |
| } |
| |
| if ((type & USB_TYPE_MASK) == USB_TYPE_STANDARD && |
| request == USB_REQ_SET_CONFIGURATION) { |
| if (!value) { |
| dev_dbg(dev->dev, "STATUS: deconfigured\n"); |
| usb_gadget_set_state(&dev->gadget, USB_STATE_ADDRESS); |
| } else if (status >= 0) { |
| /* Not configured unless gadget OK:s it */ |
| dev_dbg(dev->dev, "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 and irqs disabled */ |
| 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 and irqs disabled */ |
| 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 and irqs disabled */ |
| 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 handling */ |
| |
| /* |
| * Handles interrupts from in endpoints. Returns whether something was handled. |
| * |
| * Must be called with dev->lock held, irqs disabled and with !ep->stopped. |
| */ |
| static int gr_handle_in_ep(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 (READ_ONCE(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 interrupts from out endpoints. Returns whether something was handled. |
| * |
| * Must be called with dev->lock held, irqs disabled and with !ep->stopped. |
| */ |
| static int gr_handle_out_ep(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 = READ_ONCE(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 >= 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 something was handled. |
| * |
| * Must be called with dev->lock held and irqs disabled. |
| */ |
| static int gr_handle_state_changes(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)) { |
| dev_dbg(dev->dev, "STATUS: vbus valid detected\n"); |
| gr_vbus_connected(dev, status); |
| handled = 1; |
| } |
| |
| /* Disconnect */ |
| if (powstate && !(status & GR_STATUS_VB)) { |
| dev_dbg(dev->dev, "STATUS: vbus invalid detected\n"); |
| gr_vbus_disconnected(dev); |
| handled = 1; |
| } |
| |
| /* USB reset detected */ |
| if (status & GR_STATUS_UR) { |
| dev_dbg(dev->dev, "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)) { |
| dev_dbg(dev->dev, "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)) { |
| dev_dbg(dev->dev, "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)) { |
| dev_dbg(dev->dev, "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; |
| } |
| |
| /* Non-interrupt context irq handler */ |
| static irqreturn_t gr_irq_handler(int irq, void *_dev) |
| { |
| struct gr_udc *dev = _dev; |
| struct gr_ep *ep; |
| int handled = 0; |
| int i; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev->lock, flags); |
| |
| 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(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(ep) || handled; |
| } |
| |
| /* Check status interrupts */ |
| handled = gr_handle_state_changes(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_irqrestore(&dev->lock, flags); |
| |
| return handled ? IRQ_HANDLED : IRQ_NONE; |
| } |
| |
| /* Interrupt context irq handler */ |
| static irqreturn_t gr_irq(int irq, void *_dev) |
| { |
| struct gr_udc *dev = _dev; |
| |
| if (!dev->irq_enabled) |
| return IRQ_NONE; |
| |
| return IRQ_WAKE_THREAD; |
| } |
| |
| /* ---------------------------------------------------------------------- */ |
| /* USB ep ops */ |
| |
| /* Enable endpoint. Not for ep0in and ep0out that are handled separately. */ |
| static int gr_ep_enable(struct usb_ep *_ep, |
| const struct usb_endpoint_descriptor *desc) |
| { |
| struct gr_udc *dev; |
| struct gr_ep *ep; |
| u8 mode; |
| u8 nt; |
| u16 max; |
| u16 buffer_size = 0; |
| u32 epctrl; |
| |
| ep = container_of(_ep, struct gr_ep, ep); |
| if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) |
| return -EINVAL; |
| |
| dev = ep->dev; |
| |
| /* 'ep0' IN and OUT are reserved */ |
| if (ep == &dev->epo[0] || ep == &dev->epi[0]) |
| return -EINVAL; |
| |
| if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) |
| return -ESHUTDOWN; |
| |
| /* Make sure we are clear for enabling */ |
| epctrl = gr_read32(&ep->regs->epctrl); |
| if (epctrl & GR_EPCTRL_EV) |
| return -EBUSY; |
| |
| /* Check that directions match */ |
| if (!ep->is_in != !usb_endpoint_dir_in(desc)) |
| return -EINVAL; |
| |
| /* Check ep num */ |
| if ((!ep->is_in && ep->num >= dev->nepo) || |
| (ep->is_in && ep->num >= dev->nepi)) |
| return -EINVAL; |
| |
| if (usb_endpoint_xfer_control(desc)) { |
| mode = 0; |
| } else if (usb_endpoint_xfer_isoc(desc)) { |
| mode = 1; |
| } else if (usb_endpoint_xfer_bulk(desc)) { |
| mode = 2; |
| } else if (usb_endpoint_xfer_int(desc)) { |
| mode = 3; |
| } else { |
| dev_err(dev->dev, "Unknown transfer type for %s\n", |
| ep->ep.name); |
| return -EINVAL; |
| } |
| |
| /* |
| * Bits 10-0 set the max payload. 12-11 set the number of |
| * additional transactions. |
| */ |
| max = usb_endpoint_maxp(desc); |
| nt = usb_endpoint_maxp_mult(desc) - 1; |
| buffer_size = GR_BUFFER_SIZE(epctrl); |
| if (nt && (mode == 0 || mode == 2)) { |
| dev_err(dev->dev, |
| "%s mode: multiple trans./microframe not valid\n", |
| (mode == 2 ? "Bulk" : "Control")); |
| return -EINVAL; |
| } else if (nt == 0x3) { |
| dev_err(dev->dev, |
| "Invalid value 0x3 for additional trans./microframe\n"); |
| return -EINVAL; |
| } else if ((nt + 1) * max > buffer_size) { |
| dev_err(dev->dev, "Hw buffer size %d < max payload %d * %d\n", |
| buffer_size, (nt + 1), max); |
| return -EINVAL; |
| } else if (max == 0) { |
| dev_err(dev->dev, "Max payload cannot be set to 0\n"); |
| return -EINVAL; |
| } else if (max > ep->ep.maxpacket_limit) { |
| dev_err(dev->dev, "Requested max payload %d > limit %d\n", |
| max, ep->ep.maxpacket_limit); |
| return -EINVAL; |
| } |
| |
| spin_lock(&ep->dev->lock); |
| |
| if (!ep->stopped) { |
| spin_unlock(&ep->dev->lock); |
| return -EBUSY; |
| } |
| |
| ep->stopped = 0; |
| ep->wedged = 0; |
| ep->ep.desc = desc; |
| ep->ep.maxpacket = max; |
| ep->dma_start = 0; |
| |
| |
| if (nt) { |
| /* |
| * Maximum possible size of all payloads in one microframe |
| * regardless of direction when using high-bandwidth mode. |
| */ |
| ep->bytes_per_buffer = (nt + 1) * max; |
| } else if (ep->is_in) { |
| /* |
| * The biggest multiple of maximum packet size that fits into |
| * the buffer. The hardware will split up into many packets in |
| * the IN direction. |
| */ |
| ep->bytes_per_buffer = (buffer_size / max) * max; |
| } else { |
| /* |
| * Only single packets will be placed the buffers in the OUT |
| * direction. |
| */ |
| ep->bytes_per_buffer = max; |
| } |
| |
| epctrl = (max << GR_EPCTRL_MAXPL_POS) |
| | (nt << GR_EPCTRL_NT_POS) |
| | (mode << GR_EPCTRL_TT_POS) |
| | GR_EPCTRL_EV; |
| if (ep->is_in) |
| epctrl |= GR_EPCTRL_PI; |
| gr_write32(&ep->regs->epctrl, epctrl); |
| |
| gr_write32(&ep->regs->dmactrl, GR_DMACTRL_IE | GR_DMACTRL_AI); |
| |
| spin_unlock(&ep->dev->lock); |
| |
| dev_dbg(ep->dev->dev, "EP: %s enabled - %s with %d bytes/buffer\n", |
| ep->ep.name, gr_modestring[mode], ep->bytes_per_buffer); |
| return 0; |
| } |
| |
| /* Disable endpoint. Not for ep0in and ep0out that are handled separately. */ |
| static int gr_ep_disable(struct usb_ep *_ep) |
| { |
| struct gr_ep *ep; |
| struct gr_udc *dev; |
| unsigned long flags; |
| |
| ep = container_of(_ep, struct gr_ep, ep); |
| if (!_ep || !ep->ep.desc) |
| return -ENODEV; |
| |
| dev = ep->dev; |
| |
| /* 'ep0' IN and OUT are reserved */ |
| if (ep == &dev->epo[0] || ep == &dev->epi[0]) |
| return -EINVAL; |
| |
| if (dev->ep0state == GR_EP0_SUSPEND) |
| return -EBUSY; |
| |
| dev_dbg(ep->dev->dev, "EP: disable %s\n", ep->ep.name); |
| |
| spin_lock_irqsave(&dev->lock, flags); |
| |
| gr_ep_nuke(ep); |
| gr_ep_reset(ep); |
| ep->ep.desc = NULL; |
| |
| spin_unlock_irqrestore(&dev->lock, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * Frees a request, but not any DMA buffers associated with it |
| * (gr_finish_request should already have taken care of that). |
| */ |
| static void gr_free_request(struct usb_ep *_ep, struct usb_request *_req) |
| { |
| struct gr_request *req; |
| |
| if (!_ep || !_req) |
| return; |
| req = container_of(_req, struct gr_request, req); |
| |
| /* Leads to memory leak */ |
| WARN(!list_empty(&req->queue), |
| "request not dequeued properly before freeing\n"); |
| |
| kfree(req); |
| } |
| |
| /* Queue a request from the gadget */ |
| static int gr_queue_ext(struct usb_ep *_ep, struct usb_request *_req, |
| gfp_t gfp_flags) |
| { |
| struct gr_ep *ep; |
| struct gr_request *req; |
| struct gr_udc *dev; |
| int ret; |
| |
| if (unlikely(!_ep || !_req)) |
| return -EINVAL; |
| |
| ep = container_of(_ep, struct gr_ep, ep); |
| req = container_of(_req, struct gr_request, req); |
| dev = ep->dev; |
| |
| spin_lock(&ep->dev->lock); |
| |
| /* |
| * The ep0 pointer in the gadget struct is used both for ep0in and |
| * ep0out. In a data stage in the out direction ep0out needs to be used |
| * instead of the default ep0in. Completion functions might use |
| * driver_data, so that needs to be copied as well. |
| */ |
| if ((ep == &dev->epi[0]) && (dev->ep0state == GR_EP0_ODATA)) { |
| ep = &dev->epo[0]; |
| ep->ep.driver_data = dev->epi[0].ep.driver_data; |
| } |
| |
| if (ep->is_in) |
| gr_dbgprint_request("EXTERN", ep, req); |
| |
| ret = gr_queue(ep, req, GFP_ATOMIC); |
| |
| spin_unlock(&ep->dev->lock); |
| |
| return ret; |
| } |
| |
| /* Dequeue JUST ONE request */ |
| static int gr_dequeue(struct usb_ep *_ep, struct usb_request *_req) |
| { |
| struct gr_request *req = NULL, *iter; |
| struct gr_ep *ep; |
| struct gr_udc *dev; |
| int ret = 0; |
| unsigned long flags; |
| |
| ep = container_of(_ep, struct gr_ep, ep); |
| if (!_ep || !_req || (!ep->ep.desc && ep->num != 0)) |
| return -EINVAL; |
| dev = ep->dev; |
| if (!dev->driver) |
| return -ESHUTDOWN; |
| |
| /* We can't touch (DMA) registers when suspended */ |
| if (dev->ep0state == GR_EP0_SUSPEND) |
| return -EBUSY; |
| |
| spin_lock_irqsave(&dev->lock, flags); |
| |
| /* Make sure it's actually queued on this endpoint */ |
| list_for_each_entry(iter, &ep->queue, queue) { |
| if (&iter->req != _req) |
| continue; |
| req = iter; |
| break; |
| } |
| if (!req) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (list_first_entry(&ep->queue, struct gr_request, queue) == req) { |
| /* This request is currently being processed */ |
| gr_abort_dma(ep); |
| if (ep->stopped) |
| gr_finish_request(ep, req, -ECONNRESET); |
| else |
| gr_dma_advance(ep, -ECONNRESET); |
| } else if (!list_empty(&req->queue)) { |
| /* Not being processed - gr_finish_request dequeues it */ |
| gr_finish_request(ep, req, -ECONNRESET); |
| } else { |
| ret = -EOPNOTSUPP; |
| } |
| |
| out: |
| spin_unlock_irqrestore(&dev->lock, flags); |
| |
| return ret; |
| } |
| |
| /* Helper for gr_set_halt and gr_set_wedge */ |
| static int gr_set_halt_wedge(struct usb_ep *_ep, int halt, int wedge) |
| { |
| int ret; |
| struct gr_ep *ep; |
| |
| if (!_ep) |
| return -ENODEV; |
| ep = container_of(_ep, struct gr_ep, ep); |
| |
| spin_lock(&ep->dev->lock); |
| |
| /* Halting an IN endpoint should fail if queue is not empty */ |
| if (halt && ep->is_in && !list_empty(&ep->queue)) { |
| ret = -EAGAIN; |
| goto out; |
| } |
| |
| ret = gr_ep_halt_wedge(ep, halt, wedge, 0); |
| |
| out: |
| spin_unlock(&ep->dev->lock); |
| |
| return ret; |
| } |
| |
| /* Halt endpoint */ |
| static int gr_set_halt(struct usb_ep *_ep, int halt) |
| { |
| return gr_set_halt_wedge(_ep, halt, 0); |
| } |
| |
| /* Halt and wedge endpoint */ |
| static int gr_set_wedge(struct usb_ep *_ep) |
| { |
| return gr_set_halt_wedge(_ep, 1, 1); |
| } |
| |
| /* |
| * Return the total number of bytes currently stored in the internal buffers of |
| * the endpoint. |
| */ |
| static int gr_fifo_status(struct usb_ep *_ep) |
| { |
| struct gr_ep *ep; |
| u32 epstat; |
| u32 bytes = 0; |
| |
| if (!_ep) |
| return -ENODEV; |
| ep = container_of(_ep, struct gr_ep, ep); |
| |
| epstat = gr_read32(&ep->regs->epstat); |
| |
| if (epstat & GR_EPSTAT_B0) |
| bytes += (epstat & GR_EPSTAT_B0CNT_MASK) >> GR_EPSTAT_B0CNT_POS; |
| if (epstat & GR_EPSTAT_B1) |
| bytes += (epstat & GR_EPSTAT_B1CNT_MASK) >> GR_EPSTAT_B1CNT_POS; |
| |
| return bytes; |
| } |
| |
| |
| /* Empty data from internal buffers of an endpoint. */ |
| static void gr_fifo_flush(struct usb_ep *_ep) |
| { |
| struct gr_ep *ep; |
| u32 epctrl; |
| |
| if (!_ep) |
| return; |
| ep = container_of(_ep, struct gr_ep, ep); |
| dev_vdbg(ep->dev->dev, "EP: flush fifo %s\n", ep->ep.name); |
| |
| spin_lock(&ep->dev->lock); |
| |
| epctrl = gr_read32(&ep->regs->epctrl); |
| epctrl |= GR_EPCTRL_CB; |
| gr_write32(&ep->regs->epctrl, epctrl); |
| |
| spin_unlock(&ep->dev->lock); |
| } |
| |
| static const struct usb_ep_ops gr_ep_ops = { |
| .enable = gr_ep_enable, |
| .disable = gr_ep_disable, |
| |
| .alloc_request = gr_alloc_request, |
| .free_request = gr_free_request, |
| |
| .queue = gr_queue_ext, |
| .dequeue = gr_dequeue, |
| |
| .set_halt = gr_set_halt, |
| .set_wedge = gr_set_wedge, |
| .fifo_status = gr_fifo_status, |
| .fifo_flush = gr_fifo_flush, |
| }; |
| |
| /* ---------------------------------------------------------------------- */ |
| /* USB Gadget ops */ |
| |
| static int gr_get_frame(struct usb_gadget *_gadget) |
| { |
| struct gr_udc *dev; |
| |
| if (!_gadget) |
| return -ENODEV; |
| dev = container_of(_gadget, struct gr_udc, gadget); |
| return gr_read32(&dev->regs->status) & GR_STATUS_FN_MASK; |
| } |
| |
| static int gr_wakeup(struct usb_gadget *_gadget) |
| { |
| struct gr_udc *dev; |
| |
| if (!_gadget) |
| return -ENODEV; |
| dev = container_of(_gadget, struct gr_udc, gadget); |
| |
| /* Remote wakeup feature not enabled by host*/ |
| if (!dev->remote_wakeup) |
| return -EINVAL; |
| |
| spin_lock(&dev->lock); |
| |
| gr_write32(&dev->regs->control, |
| gr_read32(&dev->regs->control) | GR_CONTROL_RW); |
| |
| spin_unlock(&dev->lock); |
| |
| return 0; |
| } |
| |
| static int gr_pullup(struct usb_gadget *_gadget, int is_on) |
| { |
| struct gr_udc *dev; |
| u32 control; |
| |
| if (!_gadget) |
| return -ENODEV; |
| dev = container_of(_gadget, struct gr_udc, gadget); |
| |
| spin_lock(&dev->lock); |
| |
| control = gr_read32(&dev->regs->control); |
| if (is_on) |
| control |= GR_CONTROL_EP; |
| else |
| control &= ~GR_CONTROL_EP; |
| gr_write32(&dev->regs->control, control); |
| |
| spin_unlock(&dev->lock); |
| |
| return 0; |
| } |
| |
| static int gr_udc_start(struct usb_gadget *gadget, |
| struct usb_gadget_driver *driver) |
| { |
| struct gr_udc *dev = to_gr_udc(gadget); |
| |
| spin_lock(&dev->lock); |
| |
| /* Hook up the driver */ |
| driver->driver.bus = NULL; |
| dev->driver = driver; |
| |
| /* Get ready for host detection */ |
| gr_enable_vbus_detect(dev); |
| |
| spin_unlock(&dev->lock); |
| |
| return 0; |
| } |
| |
| static int gr_udc_stop(struct usb_gadget *gadget) |
| { |
| struct gr_udc *dev = to_gr_udc(gadget); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev->lock, flags); |
| |
| dev->driver = NULL; |
| gr_stop_activity(dev); |
| |
| spin_unlock_irqrestore(&dev->lock, flags); |
| |
| return 0; |
| } |
| |
| static const struct usb_gadget_ops gr_ops = { |
| .get_frame = gr_get_frame, |
| .wakeup = gr_wakeup, |
| .pullup = gr_pullup, |
| .udc_start = gr_udc_start, |
| .udc_stop = gr_udc_stop, |
| /* Other operations not supported */ |
| }; |
| |
| /* ---------------------------------------------------------------------- */ |
| /* Module probe, removal and of-matching */ |
| |
| static const char * const onames[] = { |
| "ep0out", "ep1out", "ep2out", "ep3out", "ep4out", "ep5out", |
| "ep6out", "ep7out", "ep8out", "ep9out", "ep10out", "ep11out", |
| "ep12out", "ep13out", "ep14out", "ep15out" |
| }; |
| |
| static const char * const inames[] = { |
| "ep0in", "ep1in", "ep2in", "ep3in", "ep4in", "ep5in", |
| "ep6in", "ep7in", "ep8in", "ep9in", "ep10in", "ep11in", |
| "ep12in", "ep13in", "ep14in", "ep15in" |
| }; |
| |
| /* Must be called with dev->lock held */ |
| static int gr_ep_init(struct gr_udc *dev, int num, int is_in, u32 maxplimit) |
| { |
| struct gr_ep *ep; |
| struct gr_request *req; |
| struct usb_request *_req; |
| void *buf; |
| |
| if (is_in) { |
| ep = &dev->epi[num]; |
| ep->ep.name = inames[num]; |
| ep->regs = &dev->regs->epi[num]; |
| } else { |
| ep = &dev->epo[num]; |
| ep->ep.name = onames[num]; |
| ep->regs = &dev->regs->epo[num]; |
| } |
| |
| gr_ep_reset(ep); |
| ep->num = num; |
| ep->is_in = is_in; |
| ep->dev = dev; |
| ep->ep.ops = &gr_ep_ops; |
| INIT_LIST_HEAD(&ep->queue); |
| |
| if (num == 0) { |
| _req = gr_alloc_request(&ep->ep, GFP_ATOMIC); |
| if (!_req) |
| return -ENOMEM; |
| |
| buf = devm_kzalloc(dev->dev, PAGE_SIZE, GFP_DMA | GFP_ATOMIC); |
| if (!buf) { |
| gr_free_request(&ep->ep, _req); |
| return -ENOMEM; |
| } |
| |
| req = container_of(_req, struct gr_request, req); |
| req->req.buf = buf; |
| req->req.length = MAX_CTRL_PL_SIZE; |
| |
| if (is_in) |
| dev->ep0reqi = req; /* Complete gets set as used */ |
| else |
| dev->ep0reqo = req; /* Completion treated separately */ |
| |
| usb_ep_set_maxpacket_limit(&ep->ep, MAX_CTRL_PL_SIZE); |
| ep->bytes_per_buffer = MAX_CTRL_PL_SIZE; |
| |
| ep->ep.caps.type_control = true; |
| } else { |
| usb_ep_set_maxpacket_limit(&ep->ep, (u16)maxplimit); |
| list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list); |
| |
| ep->ep.caps.type_iso = true; |
| ep->ep.caps.type_bulk = true; |
| ep->ep.caps.type_int = true; |
| } |
| list_add_tail(&ep->ep_list, &dev->ep_list); |
| |
| if (is_in) |
| ep->ep.caps.dir_in = true; |
| else |
| ep->ep.caps.dir_out = true; |
| |
| ep->tailbuf = dma_alloc_coherent(dev->dev, ep->ep.maxpacket_limit, |
| &ep->tailbuf_paddr, GFP_ATOMIC); |
| if (!ep->tailbuf) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| /* Must be called with dev->lock held */ |
| static int gr_udc_init(struct gr_udc *dev) |
| { |
| struct device_node *np = dev->dev->of_node; |
| u32 epctrl_val; |
| u32 dmactrl_val; |
| int i; |
| int ret = 0; |
| u32 bufsize; |
| |
| gr_set_address(dev, 0); |
| |
| INIT_LIST_HEAD(&dev->gadget.ep_list); |
| dev->gadget.speed = USB_SPEED_UNKNOWN; |
| dev->gadget.ep0 = &dev->epi[0].ep; |
| |
| INIT_LIST_HEAD(&dev->ep_list); |
| gr_set_ep0state(dev, GR_EP0_DISCONNECT); |
| |
| for (i = 0; i < dev->nepo; i++) { |
| if (of_property_read_u32_index(np, "epobufsizes", i, &bufsize)) |
| bufsize = 1024; |
| ret = gr_ep_init(dev, i, 0, bufsize); |
| if (ret) |
| return ret; |
| } |
| |
| for (i = 0; i < dev->nepi; i++) { |
| if (of_property_read_u32_index(np, "epibufsizes", i, &bufsize)) |
| bufsize = 1024; |
| ret = gr_ep_init(dev, i, 1, bufsize); |
| if (ret) |
| return ret; |
| } |
| |
| /* Must be disabled by default */ |
| dev->remote_wakeup = 0; |
| |
| /* Enable ep0out and ep0in */ |
| epctrl_val = (MAX_CTRL_PL_SIZE << GR_EPCTRL_MAXPL_POS) | GR_EPCTRL_EV; |
| dmactrl_val = GR_DMACTRL_IE | GR_DMACTRL_AI; |
| gr_write32(&dev->epo[0].regs->epctrl, epctrl_val); |
| gr_write32(&dev->epi[0].regs->epctrl, epctrl_val | GR_EPCTRL_PI); |
| gr_write32(&dev->epo[0].regs->dmactrl, dmactrl_val); |
| gr_write32(&dev->epi[0].regs->dmactrl, dmactrl_val); |
| |
| return 0; |
| } |
| |
| static void gr_ep_remove(struct gr_udc *dev, int num, int is_in) |
| { |
| struct gr_ep *ep; |
| |
| if (is_in) |
| ep = &dev->epi[num]; |
| else |
| ep = &dev->epo[num]; |
| |
| if (ep->tailbuf) |
| dma_free_coherent(dev->dev, ep->ep.maxpacket_limit, |
| ep->tailbuf, ep->tailbuf_paddr); |
| } |
| |
| static int gr_remove(struct platform_device *pdev) |
| { |
| struct gr_udc *dev = platform_get_drvdata(pdev); |
| int i; |
| |
| if (dev->added) |
| usb_del_gadget_udc(&dev->gadget); /* Shuts everything down */ |
| if (dev->driver) |
| return -EBUSY; |
| |
| gr_dfs_delete(dev); |
| dma_pool_destroy(dev->desc_pool); |
| platform_set_drvdata(pdev, NULL); |
| |
| gr_free_request(&dev->epi[0].ep, &dev->ep0reqi->req); |
| gr_free_request(&dev->epo[0].ep, &dev->ep0reqo->req); |
| |
| for (i = 0; i < dev->nepo; i++) |
| gr_ep_remove(dev, i, 0); |
| for (i = 0; i < dev->nepi; i++) |
| gr_ep_remove(dev, i, 1); |
| |
| return 0; |
| } |
| static int gr_request_irq(struct gr_udc *dev, int irq) |
| { |
| return devm_request_threaded_irq(dev->dev, irq, gr_irq, gr_irq_handler, |
| IRQF_SHARED, driver_name, dev); |
| } |
| |
| static int gr_probe(struct platform_device *pdev) |
| { |
| struct gr_udc *dev; |
| struct gr_regs __iomem *regs; |
| int retval; |
| u32 status; |
| |
| dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return -ENOMEM; |
| dev->dev = &pdev->dev; |
| |
| regs = devm_platform_ioremap_resource(pdev, 0); |
| if (IS_ERR(regs)) |
| return PTR_ERR(regs); |
| |
| dev->irq = platform_get_irq(pdev, 0); |
| if (dev->irq <= 0) |
| return -ENODEV; |
| |
| /* Some core configurations has separate irqs for IN and OUT events */ |
| dev->irqi = platform_get_irq(pdev, 1); |
| if (dev->irqi > 0) { |
| dev->irqo = platform_get_irq(pdev, 2); |
| if (dev->irqo <= 0) |
| return -ENODEV; |
| } else { |
| dev->irqi = 0; |
| } |
| |
| dev->gadget.name = driver_name; |
| dev->gadget.max_speed = USB_SPEED_HIGH; |
| dev->gadget.ops = &gr_ops; |
| |
| spin_lock_init(&dev->lock); |
| dev->regs = regs; |
| |
| platform_set_drvdata(pdev, dev); |
| |
| /* Determine number of endpoints and data interface mode */ |
| status = gr_read32(&dev->regs->status); |
| dev->nepi = ((status & GR_STATUS_NEPI_MASK) >> GR_STATUS_NEPI_POS) + 1; |
| dev->nepo = ((status & GR_STATUS_NEPO_MASK) >> GR_STATUS_NEPO_POS) + 1; |
| |
| if (!(status & GR_STATUS_DM)) { |
| dev_err(dev->dev, "Slave mode cores are not supported\n"); |
| return -ENODEV; |
| } |
| |
| /* --- Effects of the following calls might need explicit cleanup --- */ |
| |
| /* Create DMA pool for descriptors */ |
| dev->desc_pool = dma_pool_create("desc_pool", dev->dev, |
| sizeof(struct gr_dma_desc), 4, 0); |
| if (!dev->desc_pool) { |
| dev_err(dev->dev, "Could not allocate DMA pool"); |
| return -ENOMEM; |
| } |
| |
| /* Inside lock so that no gadget can use this udc until probe is done */ |
| retval = usb_add_gadget_udc(dev->dev, &dev->gadget); |
| if (retval) { |
| dev_err(dev->dev, "Could not add gadget udc"); |
| goto out; |
| } |
| dev->added = 1; |
| |
| spin_lock(&dev->lock); |
| |
| retval = gr_udc_init(dev); |
| if (retval) { |
| spin_unlock(&dev->lock); |
| goto out; |
| } |
| |
| /* Clear all interrupt enables that might be left on since last boot */ |
| gr_disable_interrupts_and_pullup(dev); |
| |
| spin_unlock(&dev->lock); |
| |
| gr_dfs_create(dev); |
| |
| retval = gr_request_irq(dev, dev->irq); |
| if (retval) { |
| dev_err(dev->dev, "Failed to request irq %d\n", dev->irq); |
| goto out; |
| } |
| |
| if (dev->irqi) { |
| retval = gr_request_irq(dev, dev->irqi); |
| if (retval) { |
| dev_err(dev->dev, "Failed to request irqi %d\n", |
| dev->irqi); |
| goto out; |
| } |
| retval = gr_request_irq(dev, dev->irqo); |
| if (retval) { |
| dev_err(dev->dev, "Failed to request irqo %d\n", |
| dev->irqo); |
| goto out; |
| } |
| } |
| |
| if (dev->irqi) |
| dev_info(dev->dev, "regs: %p, irqs %d, %d, %d\n", dev->regs, |
| dev->irq, dev->irqi, dev->irqo); |
| else |
| dev_info(dev->dev, "regs: %p, irq %d\n", dev->regs, dev->irq); |
| |
| out: |
| if (retval) |
| gr_remove(pdev); |
| |
| return retval; |
| } |
| |
| static const struct of_device_id gr_match[] = { |
| {.name = "GAISLER_USBDC"}, |
| {.name = "01_021"}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, gr_match); |
| |
| static struct platform_driver gr_driver = { |
| .driver = { |
| .name = DRIVER_NAME, |
| .of_match_table = gr_match, |
| }, |
| .probe = gr_probe, |
| .remove = gr_remove, |
| }; |
| module_platform_driver(gr_driver); |
| |
| MODULE_AUTHOR("Aeroflex Gaisler AB."); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE("GPL"); |