diff options
Diffstat (limited to 'drivers/usb/gadget/mv_u3d_core.c')
| -rw-r--r-- | drivers/usb/gadget/mv_u3d_core.c | 2098 |
1 files changed, 2098 insertions, 0 deletions
diff --git a/drivers/usb/gadget/mv_u3d_core.c b/drivers/usb/gadget/mv_u3d_core.c new file mode 100644 index 000000000000..8cfd5b028dbd --- /dev/null +++ b/drivers/usb/gadget/mv_u3d_core.c @@ -0,0 +1,2098 @@ +/* + * Copyright (C) 2011 Marvell International Ltd. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/timer.h> +#include <linux/list.h> +#include <linux/notifier.h> +#include <linux/interrupt.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> +#include <linux/pm.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/platform_device.h> +#include <linux/platform_data/mv_usb.h> +#include <linux/clk.h> +#include <asm/system.h> +#include <asm/unaligned.h> +#include <asm/byteorder.h> + +#include "mv_u3d.h" + +#define DRIVER_DESC "Marvell PXA USB3.0 Device Controller driver" + +static const char driver_name[] = "mv_u3d"; +static const char driver_desc[] = DRIVER_DESC; + +static void mv_u3d_nuke(struct mv_u3d_ep *ep, int status); +static void mv_u3d_stop_activity(struct mv_u3d *u3d, + struct usb_gadget_driver *driver); + +/* for endpoint 0 operations */ +static const struct usb_endpoint_descriptor mv_u3d_ep0_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = 0, + .bmAttributes = USB_ENDPOINT_XFER_CONTROL, + .wMaxPacketSize = MV_U3D_EP0_MAX_PKT_SIZE, +}; + +static void mv_u3d_ep0_reset(struct mv_u3d *u3d) +{ + struct mv_u3d_ep *ep; + u32 epxcr; + int i; + + for (i = 0; i < 2; i++) { + ep = &u3d->eps[i]; + ep->u3d = u3d; + + /* ep0 ep context, ep0 in and out share the same ep context */ + ep->ep_context = &u3d->ep_context[1]; + } + + /* reset ep state machine */ + /* reset ep0 out */ + epxcr = ioread32(&u3d->vuc_regs->epcr[0].epxoutcr0); + epxcr |= MV_U3D_EPXCR_EP_INIT; + iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxoutcr0); + udelay(5); + epxcr &= ~MV_U3D_EPXCR_EP_INIT; + iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxoutcr0); + + epxcr = ((MV_U3D_EP0_MAX_PKT_SIZE + << MV_U3D_EPXCR_MAX_PACKET_SIZE_SHIFT) + | (1 << MV_U3D_EPXCR_MAX_BURST_SIZE_SHIFT) + | (1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT) + | MV_U3D_EPXCR_EP_TYPE_CONTROL); + iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxoutcr1); + + /* reset ep0 in */ + epxcr = ioread32(&u3d->vuc_regs->epcr[0].epxincr0); + epxcr |= MV_U3D_EPXCR_EP_INIT; + iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxincr0); + udelay(5); + epxcr &= ~MV_U3D_EPXCR_EP_INIT; + iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxincr0); + + epxcr = ((MV_U3D_EP0_MAX_PKT_SIZE + << MV_U3D_EPXCR_MAX_PACKET_SIZE_SHIFT) + | (1 << MV_U3D_EPXCR_MAX_BURST_SIZE_SHIFT) + | (1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT) + | MV_U3D_EPXCR_EP_TYPE_CONTROL); + iowrite32(epxcr, &u3d->vuc_regs->epcr[0].epxincr1); +} + +static void mv_u3d_ep0_stall(struct mv_u3d *u3d) +{ + u32 tmp; + dev_dbg(u3d->dev, "%s\n", __func__); + + /* set TX and RX to stall */ + tmp = ioread32(&u3d->vuc_regs->epcr[0].epxoutcr0); + tmp |= MV_U3D_EPXCR_EP_HALT; + iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxoutcr0); + + tmp = ioread32(&u3d->vuc_regs->epcr[0].epxincr0); + tmp |= MV_U3D_EPXCR_EP_HALT; + iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxincr0); + + /* update ep0 state */ + u3d->ep0_state = MV_U3D_WAIT_FOR_SETUP; + u3d->ep0_dir = MV_U3D_EP_DIR_OUT; +} + +static int mv_u3d_process_ep_req(struct mv_u3d *u3d, int index, + struct mv_u3d_req *curr_req) +{ + struct mv_u3d_trb *curr_trb; + dma_addr_t cur_deq_lo; + struct mv_u3d_ep_context *curr_ep_context; + int trb_complete, actual, remaining_length; + int direction, ep_num; + int retval = 0; + u32 tmp, status, length; + + curr_ep_context = &u3d->ep_context[index]; + direction = index % 2; + ep_num = index / 2; + + trb_complete = 0; + actual = curr_req->req.length; + + while (!list_empty(&curr_req->trb_list)) { + curr_trb = list_entry(curr_req->trb_list.next, + struct mv_u3d_trb, trb_list); + if (!curr_trb->trb_hw->ctrl.own) { + dev_err(u3d->dev, "%s, TRB own error!\n", + u3d->eps[index].name); + return 1; + } + + curr_trb->trb_hw->ctrl.own = 0; + if (direction == MV_U3D_EP_DIR_OUT) { + tmp = ioread32(&u3d->vuc_regs->rxst[ep_num].statuslo); + cur_deq_lo = + ioread32(&u3d->vuc_regs->rxst[ep_num].curdeqlo); + } else { + tmp = ioread32(&u3d->vuc_regs->txst[ep_num].statuslo); + cur_deq_lo = + ioread32(&u3d->vuc_regs->txst[ep_num].curdeqlo); + } + + status = tmp >> MV_U3D_XFERSTATUS_COMPLETE_SHIFT; + length = tmp & MV_U3D_XFERSTATUS_TRB_LENGTH_MASK; + + if (status == MV_U3D_COMPLETE_SUCCESS || + (status == MV_U3D_COMPLETE_SHORT_PACKET && + direction == MV_U3D_EP_DIR_OUT)) { + remaining_length += length; + actual -= remaining_length; + } else { + dev_err(u3d->dev, + "complete_tr error: ep=%d %s: error = 0x%x\n", + index >> 1, direction ? "SEND" : "RECV", + status); + retval = -EPROTO; + } + + list_del_init(&curr_trb->trb_list); + } + if (retval) + return retval; + + curr_req->req.actual = actual; + return 0; +} + +/* + * mv_u3d_done() - retire a request; caller blocked irqs + * @status : request status to be set, only works when + * request is still in progress. + */ +static +void mv_u3d_done(struct mv_u3d_ep *ep, struct mv_u3d_req *req, int status) +{ + struct mv_u3d *u3d = (struct mv_u3d *)ep->u3d; + + dev_dbg(u3d->dev, "mv_u3d_done: remove req->queue\n"); + /* Removed the req from ep queue */ + list_del_init(&req->queue); + + /* req.status should be set as -EINPROGRESS in ep_queue() */ + if (req->req.status == -EINPROGRESS) + req->req.status = status; + else + status = req->req.status; + + /* Free trb for the request */ + if (!req->chain) + dma_pool_free(u3d->trb_pool, + req->trb_head->trb_hw, req->trb_head->trb_dma); + else { + dma_unmap_single(ep->u3d->gadget.dev.parent, + (dma_addr_t)req->trb_head->trb_dma, + req->trb_count * sizeof(struct mv_u3d_trb_hw), + DMA_BIDIRECTIONAL); + kfree(req->trb_head->trb_hw); + } + kfree(req->trb_head); + + usb_gadget_unmap_request(&u3d->gadget, &req->req, mv_u3d_ep_dir(ep)); + + if (status && (status != -ESHUTDOWN)) { + dev_dbg(u3d->dev, "complete %s req %p stat %d len %u/%u", + ep->ep.name, &req->req, status, + req->req.actual, req->req.length); + } + + spin_unlock(&ep->u3d->lock); + /* + * complete() is from gadget layer, + * eg fsg->bulk_in_complete() + */ + if (req->req.complete) + req->req.complete(&ep->ep, &req->req); + + spin_lock(&ep->u3d->lock); +} + +static int mv_u3d_queue_trb(struct mv_u3d_ep *ep, struct mv_u3d_req *req) +{ + u32 tmp, direction; + struct mv_u3d *u3d; + struct mv_u3d_ep_context *ep_context; + int retval = 0; + + u3d = ep->u3d; + direction = mv_u3d_ep_dir(ep); + + /* ep0 in and out share the same ep context slot 1*/ + if (ep->ep_num == 0) + ep_context = &(u3d->ep_context[1]); + else + ep_context = &(u3d->ep_context[ep->ep_num * 2 + direction]); + + /* check if the pipe is empty or not */ + if (!list_empty(&ep->queue)) { + dev_err(u3d->dev, "add trb to non-empty queue!\n"); + retval = -ENOMEM; + WARN_ON(1); + } else { + ep_context->rsvd0 = cpu_to_le32(1); + ep_context->rsvd1 = 0; + + /* Configure the trb address and set the DCS bit. + * Both DCS bit and own bit in trb should be set. + */ + ep_context->trb_addr_lo = + cpu_to_le32(req->trb_head->trb_dma | DCS_ENABLE); + ep_context->trb_addr_hi = 0; + + /* Ensure that updates to the EP Context will + * occure before Ring Bell. + */ + wmb(); + + /* ring bell the ep */ + if (ep->ep_num == 0) + tmp = 0x1; + else + tmp = ep->ep_num * 2 + + ((direction == MV_U3D_EP_DIR_OUT) ? 0 : 1); + + iowrite32(tmp, &u3d->op_regs->doorbell); + } + return retval; +} + +static struct mv_u3d_trb *mv_u3d_build_trb_one(struct mv_u3d_req *req, + unsigned *length, dma_addr_t *dma) +{ + u32 temp; + unsigned int direction; + struct mv_u3d_trb *trb; + struct mv_u3d_trb_hw *trb_hw; + struct mv_u3d *u3d; + + /* how big will this transfer be? */ + *length = req->req.length - req->req.actual; + BUG_ON(*length > (unsigned)MV_U3D_EP_MAX_LENGTH_TRANSFER); + + u3d = req->ep->u3d; + + trb = kzalloc(sizeof(*trb), GFP_ATOMIC); + if (!trb) { + dev_err(u3d->dev, "%s, trb alloc fail\n", __func__); + return NULL; + } + + /* + * Be careful that no _GFP_HIGHMEM is set, + * or we can not use dma_to_virt + * cannot use GFP_KERNEL in spin lock + */ + trb_hw = dma_pool_alloc(u3d->trb_pool, GFP_ATOMIC, dma); + if (!trb_hw) { + dev_err(u3d->dev, + "%s, dma_pool_alloc fail\n", __func__); + return NULL; + } + trb->trb_dma = *dma; + trb->trb_hw = trb_hw; + + /* initialize buffer page pointers */ + temp = (u32)(req->req.dma + req->req.actual); + + trb_hw->buf_addr_lo = cpu_to_le32(temp); + trb_hw->buf_addr_hi = 0; + trb_hw->trb_len = cpu_to_le32(*length); + trb_hw->ctrl.own = 1; + + if (req->ep->ep_num == 0) + trb_hw->ctrl.type = TYPE_DATA; + else + trb_hw->ctrl.type = TYPE_NORMAL; + + req->req.actual += *length; + + direction = mv_u3d_ep_dir(req->ep); + if (direction == MV_U3D_EP_DIR_IN) + trb_hw->ctrl.dir = 1; + else + trb_hw->ctrl.dir = 0; + + /* Enable interrupt for the last trb of a request */ + if (!req->req.no_interrupt) + trb_hw->ctrl.ioc = 1; + + trb_hw->ctrl.chain = 0; + + wmb(); + return trb; +} + +static int mv_u3d_build_trb_chain(struct mv_u3d_req *req, unsigned *length, + struct mv_u3d_trb *trb, int *is_last) +{ + u32 temp; + unsigned int direction; + struct mv_u3d *u3d; + + /* how big will this transfer be? */ + *length = min(req->req.length - req->req.actual, + (unsigned)MV_U3D_EP_MAX_LENGTH_TRANSFER); + + u3d = req->ep->u3d; + + trb->trb_dma = 0; + + /* initialize buffer page pointers */ + temp = (u32)(req->req.dma + req->req.actual); + + trb->trb_hw->buf_addr_lo = cpu_to_le32(temp); + trb->trb_hw->buf_addr_hi = 0; + trb->trb_hw->trb_len = cpu_to_le32(*length); + trb->trb_hw->ctrl.own = 1; + + if (req->ep->ep_num == 0) + trb->trb_hw->ctrl.type = TYPE_DATA; + else + trb->trb_hw->ctrl.type = TYPE_NORMAL; + + req->req.actual += *length; + + direction = mv_u3d_ep_dir(req->ep); + if (direction == MV_U3D_EP_DIR_IN) + trb->trb_hw->ctrl.dir = 1; + else + trb->trb_hw->ctrl.dir = 0; + + /* zlp is needed if req->req.zero is set */ + if (req->req.zero) { + if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0) + *is_last = 1; + else + *is_last = 0; + } else if (req->req.length == req->req.actual) + *is_last = 1; + else + *is_last = 0; + + /* Enable interrupt for the last trb of a request */ + if (*is_last && !req->req.no_interrupt) + trb->trb_hw->ctrl.ioc = 1; + + if (*is_last) + trb->trb_hw->ctrl.chain = 0; + else { + trb->trb_hw->ctrl.chain = 1; + dev_dbg(u3d->dev, "chain trb\n"); + } + + wmb(); + + return 0; +} + +/* generate TRB linked list for a request + * usb controller only supports continous trb chain, + * that trb structure physical address should be continous. + */ +static int mv_u3d_req_to_trb(struct mv_u3d_req *req) +{ + unsigned count; + int is_last; + struct mv_u3d_trb *trb; + struct mv_u3d_trb_hw *trb_hw; + struct mv_u3d *u3d; + dma_addr_t dma; + unsigned length; + unsigned trb_num; + + u3d = req->ep->u3d; + + INIT_LIST_HEAD(&req->trb_list); + + length = req->req.length - req->req.actual; + /* normally the request transfer length is less than 16KB. + * we use buil_trb_one() to optimize it. + */ + if (length <= (unsigned)MV_U3D_EP_MAX_LENGTH_TRANSFER) { + trb = mv_u3d_build_trb_one(req, &count, &dma); + list_add_tail(&trb->trb_list, &req->trb_list); + req->trb_head = trb; + req->trb_count = 1; + req->chain = 0; + } else { + trb_num = length / MV_U3D_EP_MAX_LENGTH_TRANSFER; + if (length % MV_U3D_EP_MAX_LENGTH_TRANSFER) + trb_num++; + + trb = kcalloc(trb_num, sizeof(*trb), GFP_ATOMIC); + if (!trb) { + dev_err(u3d->dev, + "%s, trb alloc fail\n", __func__); + return -ENOMEM; + } + + trb_hw = kcalloc(trb_num, sizeof(*trb_hw), GFP_ATOMIC); + if (!trb_hw) { + dev_err(u3d->dev, + "%s, trb_hw alloc fail\n", __func__); + return -ENOMEM; + } + + do { + trb->trb_hw = trb_hw; + if (mv_u3d_build_trb_chain(req, &count, + trb, &is_last)) { + dev_err(u3d->dev, + "%s, mv_u3d_build_trb_chain fail\n", + __func__); + return -EIO; + } + + list_add_tail(&trb->trb_list, &req->trb_list); + req->trb_count++; + trb++; + trb_hw++; + } while (!is_last); + + req->trb_head = list_entry(req->trb_list.next, + struct mv_u3d_trb, trb_list); + req->trb_head->trb_dma = dma_map_single(u3d->gadget.dev.parent, + req->trb_head->trb_hw, + trb_num * sizeof(*trb_hw), + DMA_BIDIRECTIONAL); + + req->chain = 1; + } + + return 0; +} + +static int +mv_u3d_start_queue(struct mv_u3d_ep *ep) +{ + struct mv_u3d *u3d = ep->u3d; + struct mv_u3d_req *req; + int ret; + + if (!list_empty(&ep->req_list) && !ep->processing) + req = list_entry(ep->req_list.next, struct mv_u3d_req, list); + else + return 0; + + ep->processing = 1; + + /* set up dma mapping */ + ret = usb_gadget_map_request(&u3d->gadget, &req->req, + mv_u3d_ep_dir(ep)); + if (ret) + return ret; + + req->req.status = -EINPROGRESS; + req->req.actual = 0; + req->trb_count = 0; + + /* build trbs and push them to device queue */ + if (!mv_u3d_req_to_trb(req)) { + ret = mv_u3d_queue_trb(ep, req); + if (ret) { + ep->processing = 0; + return ret; + } + } else { + ep->processing = 0; + dev_err(u3d->dev, "%s, mv_u3d_req_to_trb fail\n", __func__); + return -ENOMEM; + } + + /* irq handler advances the queue */ + if (req) + list_add_tail(&req->queue, &ep->queue); + + return 0; +} + +static int mv_u3d_ep_enable(struct usb_ep *_ep, + const struct usb_endpoint_descriptor *desc) +{ + struct mv_u3d *u3d; + struct mv_u3d_ep *ep; + struct mv_u3d_ep_context *ep_context; + u16 max = 0; + unsigned maxburst = 0; + u32 epxcr, direction; + + if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) + return -EINVAL; + + ep = container_of(_ep, struct mv_u3d_ep, ep); + u3d = ep->u3d; + + if (!u3d->driver || u3d->gadget.speed == USB_SPEED_UNKNOWN) + return -ESHUTDOWN; + + direction = mv_u3d_ep_dir(ep); + max = le16_to_cpu(desc->wMaxPacketSize); + + if (!_ep->maxburst) + _ep->maxburst = 1; + maxburst = _ep->maxburst; + + /* Get the endpoint context address */ + ep_context = (struct mv_u3d_ep_context *)ep->ep_context; + + /* Set the max burst size */ + switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { + case USB_ENDPOINT_XFER_BULK: + if (maxburst > 16) { + dev_dbg(u3d->dev, + "max burst should not be greater " + "than 16 on bulk ep\n"); + maxburst = 1; + _ep->maxburst = maxburst; + } + dev_dbg(u3d->dev, + "maxburst: %d on bulk %s\n", maxburst, ep->name); + break; + case USB_ENDPOINT_XFER_CONTROL: + /* control transfer only supports maxburst as one */ + maxburst = 1; + _ep->maxburst = maxburst; + break; + case USB_ENDPOINT_XFER_INT: + if (maxburst != 1) { + dev_dbg(u3d->dev, + "max burst should be 1 on int ep " + "if transfer size is not 1024\n"); + maxburst = 1; + _ep->maxburst = maxburst; + } + break; + case USB_ENDPOINT_XFER_ISOC: + if (maxburst != 1) { + dev_dbg(u3d->dev, + "max burst should be 1 on isoc ep " + "if transfer size is not 1024\n"); + maxburst = 1; + _ep->maxburst = maxburst; + } + break; + default: + goto en_done; + } + + ep->ep.maxpacket = max; + ep->ep.desc = desc; + ep->enabled = 1; + + /* Enable the endpoint for Rx or Tx and set the endpoint type */ + if (direction == MV_U3D_EP_DIR_OUT) { + epxcr = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0); + epxcr |= MV_U3D_EPXCR_EP_INIT; + iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0); + udelay(5); + epxcr &= ~MV_U3D_EPXCR_EP_INIT; + iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0); + + epxcr = ((max << MV_U3D_EPXCR_MAX_PACKET_SIZE_SHIFT) + | ((maxburst - 1) << MV_U3D_EPXCR_MAX_BURST_SIZE_SHIFT) + | (1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT) + | (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)); + iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr1); + } else { + epxcr = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr0); + epxcr |= MV_U3D_EPXCR_EP_INIT; + iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxincr0); + udelay(5); + epxcr &= ~MV_U3D_EPXCR_EP_INIT; + iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxincr0); + + epxcr = ((max << MV_U3D_EPXCR_MAX_PACKET_SIZE_SHIFT) + | ((maxburst - 1) << MV_U3D_EPXCR_MAX_BURST_SIZE_SHIFT) + | (1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT) + | (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)); + iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxincr1); + } + + return 0; +en_done: + return -EINVAL; +} + +static int mv_u3d_ep_disable(struct usb_ep *_ep) +{ + struct mv_u3d *u3d; + struct mv_u3d_ep *ep; + struct mv_u3d_ep_context *ep_context; + u32 epxcr, direction; + + if (!_ep) + return -EINVAL; + + ep = container_of(_ep, struct mv_u3d_ep, ep); + if (!ep->ep.desc) + return -EINVAL; + + u3d = ep->u3d; + + /* Get the endpoint context address */ + ep_context = ep->ep_context; + + direction = mv_u3d_ep_dir(ep); + + /* nuke all pending requests (does flush) */ + mv_u3d_nuke(ep, -ESHUTDOWN); + + /* Disable the endpoint for Rx or Tx and reset the endpoint type */ + if (direction == MV_U3D_EP_DIR_OUT) { + epxcr = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr1); + epxcr &= ~((1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT) + | USB_ENDPOINT_XFERTYPE_MASK); + iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr1); + } else { + epxcr = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr1); + epxcr &= ~((1 << MV_U3D_EPXCR_EP_ENABLE_SHIFT) + | USB_ENDPOINT_XFERTYPE_MASK); + iowrite32(epxcr, &u3d->vuc_regs->epcr[ep->ep_num].epxincr1); + } + + ep->enabled = 0; + + ep->ep.desc = NULL; + return 0; +} + +static struct usb_request * +mv_u3d_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) +{ + struct mv_u3d_req *req = NULL; + + req = kzalloc(sizeof *req, gfp_flags); + if (!req) + return NULL; + + INIT_LIST_HEAD(&req->queue); + + return &req->req; +} + +static void mv_u3d_free_request(struct usb_ep *_ep, struct usb_request *_req) +{ + struct mv_u3d_req *req = container_of(_req, struct mv_u3d_req, req); + + kfree(req); +} + +static void mv_u3d_ep_fifo_flush(struct usb_ep *_ep) +{ + struct mv_u3d *u3d; + u32 direction; + struct mv_u3d_ep *ep = container_of(_ep, struct mv_u3d_ep, ep); + unsigned int loops; + u32 tmp; + + /* if endpoint is not enabled, cannot flush endpoint */ + if (!ep->enabled) + return; + + u3d = ep->u3d; + direction = mv_u3d_ep_dir(ep); + + /* ep0 need clear bit after flushing fifo. */ + if (!ep->ep_num) { + if (direction == MV_U3D_EP_DIR_OUT) { + tmp = ioread32(&u3d->vuc_regs->epcr[0].epxoutcr0); + tmp |= MV_U3D_EPXCR_EP_FLUSH; + iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxoutcr0); + udelay(10); + tmp &= ~MV_U3D_EPXCR_EP_FLUSH; + iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxoutcr0); + } else { + tmp = ioread32(&u3d->vuc_regs->epcr[0].epxincr0); + tmp |= MV_U3D_EPXCR_EP_FLUSH; + iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxincr0); + udelay(10); + tmp &= ~MV_U3D_EPXCR_EP_FLUSH; + iowrite32(tmp, &u3d->vuc_regs->epcr[0].epxincr0); + } + return; + } + + if (direction == MV_U3D_EP_DIR_OUT) { + tmp = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0); + tmp |= MV_U3D_EPXCR_EP_FLUSH; + iowrite32(tmp, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0); + + /* Wait until flushing completed */ + loops = LOOPS(MV_U3D_FLUSH_TIMEOUT); + while (ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0) & + MV_U3D_EPXCR_EP_FLUSH) { + /* + * EP_FLUSH bit should be cleared to indicate this + * operation is complete + */ + if (loops == 0) { + dev_dbg(u3d->dev, + "EP FLUSH TIMEOUT for ep%d%s\n", ep->ep_num, + direction ? "in" : "out"); + return; + } + loops--; + udelay(LOOPS_USEC); + } + } else { /* EP_DIR_IN */ + tmp = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr0); + tmp |= MV_U3D_EPXCR_EP_FLUSH; + iowrite32(tmp, &u3d->vuc_regs->epcr[ep->ep_num].epxincr0); + + /* Wait until flushing completed */ + loops = LOOPS(MV_U3D_FLUSH_TIMEOUT); + while (ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr0) & + MV_U3D_EPXCR_EP_FLUSH) { + /* + * EP_FLUSH bit should be cleared to indicate this + * operation is complete + */ + if (loops == 0) { + dev_dbg(u3d->dev, + "EP FLUSH TIMEOUT for ep%d%s\n", ep->ep_num, + direction ? "in" : "out"); + return; + } + loops--; + udelay(LOOPS_USEC); + } + } +} + +/* queues (submits) an I/O request to an endpoint */ +static int +mv_u3d_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) +{ + struct mv_u3d_ep *ep; + struct mv_u3d_req *req; + struct mv_u3d *u3d; + unsigned long flags; + int is_first_req = 0; + + if (unlikely(!_ep || !_req)) + return -EINVAL; + + ep = container_of(_ep, struct mv_u3d_ep, ep); + u3d = ep->u3d; + + req = container_of(_req, struct mv_u3d_req, req); + + if (!ep->ep_num + && u3d->ep0_state == MV_U3D_STATUS_STAGE + && !_req->length) { + dev_dbg(u3d->dev, "ep0 status stage\n"); + u3d->ep0_state = MV_U3D_WAIT_FOR_SETUP; + return 0; + } + + dev_dbg(u3d->dev, "%s: %s, req: 0x%x\n", + __func__, _ep->name, (u32)req); + + /* catch various bogus parameters */ + if (!req->req.complete || !req->req.buf + || !list_empty(&req->queue)) { + dev_err(u3d->dev, + "%s, bad params, _req: 0x%x," + "req->req.complete: 0x%x, req->req.buf: 0x%x," + "list_empty: 0x%x\n", + __func__, (u32)_req, + (u32)req->req.complete, (u32)req->req.buf, + (u32)list_empty(&req->queue)); + return -EINVAL; + } + if (unlikely(!ep->ep.desc)) { + dev_err(u3d->dev, "%s, bad ep\n", __func__); + return -EINVAL; + } + if (ep->ep.desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) { + if (req->req.length > ep->ep.maxpacket) + return -EMSGSIZE; + } + + if (!u3d->driver || u3d->gadget.speed == USB_SPEED_UNKNOWN) { + dev_err(u3d->dev, + "bad params of driver/speed\n"); + return -ESHUTDOWN; + } + + req->ep = ep; + + /* Software list handles usb request. */ + spin_lock_irqsave(&ep->req_lock, flags); + is_first_req = list_empty(&ep->req_list); + list_add_tail(&req->list, &ep->req_list); + spin_unlock_irqrestore(&ep->req_lock, flags); + if (!is_first_req) { + dev_dbg(u3d->dev, "list is not empty\n"); + return 0; + } + + dev_dbg(u3d->dev, "call mv_u3d_start_queue from usb_ep_queue\n"); + spin_lock_irqsave(&u3d->lock, flags); + mv_u3d_start_queue(ep); + spin_unlock_irqrestore(&u3d->lock, flags); + return 0; +} + +/* dequeues (cancels, unlinks) an I/O request from an endpoint */ +static int mv_u3d_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) +{ + struct mv_u3d_ep *ep; + struct mv_u3d_req *req; + struct mv_u3d *u3d; + struct mv_u3d_ep_context *ep_context; + struct mv_u3d_req *next_req; + + unsigned long flags; + int ret = 0; + + if (!_ep || !_req) + return -EINVAL; + + ep = container_of(_ep, struct mv_u3d_ep, ep); + u3d = ep->u3d; + + spin_lock_irqsave(&ep->u3d->lock, flags); + + /* make sure it's actually queued on this endpoint */ + list_for_each_entry(req, &ep->queue, queue) { + if (&req->req == _req) + break; + } + if (&req->req != _req) { + ret = -EINVAL; + goto out; + } + + /* The request is in progress, or completed but not dequeued */ + if (ep->queue.next == &req->queue) { + _req->status = -ECONNRESET; + mv_u3d_ep_fifo_flush(_ep); + + /* The request isn't the last request in this ep queue */ + if (req->queue.next != &ep->queue) { + dev_dbg(u3d->dev, + "it is the last request in this ep queue\n"); + ep_context = ep->ep_context; + next_req = list_entry(req->queue.next, + struct mv_u3d_req, queue); + + /* Point first TRB of next request to the EP context. */ + iowrite32((u32) next_req->trb_head, + &ep_context->trb_addr_lo); + } else { + struct mv_u3d_ep_context *ep_context; + ep_context = ep->ep_context; + ep_context->trb_addr_lo = 0; + ep_context->trb_addr_hi = 0; + } + + } else + WARN_ON(1); + + mv_u3d_done(ep, req, -ECONNRESET); + + /* remove the req from the ep req list */ + if (!list_empty(&ep->req_list)) { + struct mv_u3d_req *curr_req; + curr_req = list_entry(ep->req_list.next, + struct mv_u3d_req, list); + if (curr_req == req) { + list_del_init(&req->list); + ep->processing = 0; + } + } + +out: + spin_unlock_irqrestore(&ep->u3d->lock, flags); + return ret; +} + +static void +mv_u3d_ep_set_stall(struct mv_u3d *u3d, u8 ep_num, u8 direction, int stall) +{ + u32 tmp; + struct mv_u3d_ep *ep = u3d->eps; + + dev_dbg(u3d->dev, "%s\n", __func__); + if (direction == MV_U3D_EP_DIR_OUT) { + tmp = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0); + if (stall) + tmp |= MV_U3D_EPXCR_EP_HALT; + else + tmp &= ~MV_U3D_EPXCR_EP_HALT; + iowrite32(tmp, &u3d->vuc_regs->epcr[ep->ep_num].epxoutcr0); + } else { + tmp = ioread32(&u3d->vuc_regs->epcr[ep->ep_num].epxincr0); + if (stall) + tmp |= MV_U3D_EPXCR_EP_HALT; + else + tmp &= ~MV_U3D_EPXCR_EP_HALT; + iowrite32(tmp, &u3d->vuc_regs->epcr[ep->ep_num].epxincr0); + } +} + +static int mv_u3d_ep_set_halt_wedge(struct usb_ep *_ep, int halt, int wedge) +{ + struct mv_u3d_ep *ep; + unsigned long flags = 0; + int status = 0; + struct mv_u3d *u3d; + + ep = container_of(_ep, struct mv_u3d_ep, ep); + u3d = ep->u3d; + if (!ep->ep.desc) { + status = -EINVAL; + goto out; + } + + if (ep->ep.desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) { + status = -EOPNOTSUPP; + goto out; + } + + /* + * Attempt to halt IN ep will fail if any transfer requests + * are still queue + */ + if (halt && (mv_u3d_ep_dir(ep) == MV_U3D_EP_DIR_IN) + && !list_empty(&ep->queue)) { + status = -EAGAIN; + goto out; + } + + spin_lock_irqsave(&ep->u3d->lock, flags); + mv_u3d_ep_set_stall(u3d, ep->ep_num, mv_u3d_ep_dir(ep), halt); + if (halt && wedge) + ep->wedge = 1; + else if (!halt) + ep->wedge = 0; + spin_unlock_irqrestore(&ep->u3d->lock, flags); + + if (ep->ep_num == 0) + u3d->ep0_dir = MV_U3D_EP_DIR_OUT; +out: + return status; +} + +static int mv_u3d_ep_set_halt(struct usb_ep *_ep, int halt) +{ + return mv_u3d_ep_set_halt_wedge(_ep, halt, 0); +} + +static int mv_u3d_ep_set_wedge(struct usb_ep *_ep) +{ + return mv_u3d_ep_set_halt_wedge(_ep, 1, 1); +} + +static struct usb_ep_ops mv_u3d_ep_ops = { + .enable = mv_u3d_ep_enable, + .disable = mv_u3d_ep_disable, + + .alloc_request = mv_u3d_alloc_request, + .free_request = mv_u3d_free_request, + + .queue = mv_u3d_ep_queue, + .dequeue = mv_u3d_ep_dequeue, + + .set_wedge = mv_u3d_ep_set_wedge, + .set_halt = mv_u3d_ep_set_halt, + .fifo_flush = mv_u3d_ep_fifo_flush, +}; + +static void mv_u3d_controller_stop(struct mv_u3d *u3d) +{ + u32 tmp; + + if (!u3d->clock_gating && u3d->vbus_valid_detect) + iowrite32(MV_U3D_INTR_ENABLE_VBUS_VALID, + &u3d->vuc_regs->intrenable); + else + iowrite32(0, &u3d->vuc_regs->intrenable); + iowrite32(~0x0, &u3d->vuc_regs->endcomplete); + iowrite32(~0x0, &u3d->vuc_regs->trbunderrun); + iowrite32(~0x0, &u3d->vuc_regs->trbcomplete); + iowrite32(~0x0, &u3d->vuc_regs->linkchange); + iowrite32(0x1, &u3d->vuc_regs->setuplock); + + /* Reset the RUN bit in the command register to stop USB */ + tmp = ioread32(&u3d->op_regs->usbcmd); + tmp &= ~MV_U3D_CMD_RUN_STOP; + iowrite32(tmp, &u3d->op_regs->usbcmd); + dev_dbg(u3d->dev, "after u3d_stop, USBCMD 0x%x\n", + ioread32(&u3d->op_regs->usbcmd)); +} + +static void mv_u3d_controller_start(struct mv_u3d *u3d) +{ + u32 usbintr; + u32 temp; + + /* enable link LTSSM state machine */ + temp = ioread32(&u3d->vuc_regs->ltssm); + temp |= MV_U3D_LTSSM_PHY_INIT_DONE; + iowrite32(temp, &u3d->vuc_regs->ltssm); + + /* Enable interrupts */ + usbintr = MV_U3D_INTR_ENABLE_LINK_CHG | MV_U3D_INTR_ENABLE_TXDESC_ERR | + MV_U3D_INTR_ENABLE_RXDESC_ERR | MV_U3D_INTR_ENABLE_TX_COMPLETE | + MV_U3D_INTR_ENABLE_RX_COMPLETE | MV_U3D_INTR_ENABLE_SETUP | + (u3d->vbus_valid_detect ? MV_U3D_INTR_ENABLE_VBUS_VALID : 0); + iowrite32(usbintr, &u3d->vuc_regs->intrenable); + + /* Enable ctrl ep */ + iowrite32(0x1, &u3d->vuc_regs->ctrlepenable); + + /* Set the Run bit in the command register */ + iowrite32(MV_U3D_CMD_RUN_STOP, &u3d->op_regs->usbcmd); + dev_dbg(u3d->dev, "after u3d_start, USBCMD 0x%x\n", + ioread32(&u3d->op_regs->usbcmd)); +} + +static int mv_u3d_controller_reset(struct mv_u3d *u3d) +{ + unsigned int loops; + u32 tmp; + + /* Stop the controller */ + tmp = ioread32(&u3d->op_regs->usbcmd); + tmp &= ~MV_U3D_CMD_RUN_STOP; + iowrite32(tmp, &u3d->op_regs->usbcmd); + + /* Reset the controller to get default values */ + iowrite32(MV_U3D_CMD_CTRL_RESET, &u3d->op_regs->usbcmd); + + /* wait for reset to complete */ + loops = LOOPS(MV_U3D_RESET_TIMEOUT); + while (ioread32(&u3d->op_regs->usbcmd) & MV_U3D_CMD_CTRL_RESET) { + if (loops == 0) { + dev_err(u3d->dev, + "Wait for RESET completed TIMEOUT\n"); + return -ETIMEDOUT; + } + loops--; + udelay(LOOPS_USEC); + } + + /* Configure the Endpoint Context Address */ + iowrite32(u3d->ep_context_dma, &u3d->op_regs->dcbaapl); + iowrite32(0, &u3d->op_regs->dcbaaph); + + return 0; +} + +static int mv_u3d_enable(struct mv_u3d *u3d) +{ + struct mv_usb_platform_data *pdata = u3d->dev->platform_data; + int retval; + + if (u3d->active) + return 0; + + if (!u3d->clock_gating) { + u3d->active = 1; + return 0; + } + + dev_dbg(u3d->dev, "enable u3d\n"); + clk_enable(u3d->clk); + if (pdata->phy_init) { + retval = pdata->phy_init(u3d->phy_regs); + if (retval) { + dev_err(u3d->dev, + "init phy error %d\n", retval); + clk_disable(u3d->clk); + return retval; + } + } + u3d->active = 1; + + return 0; +} + +static void mv_u3d_disable(struct mv_u3d *u3d) +{ + struct mv_usb_platform_data *pdata = u3d->dev->platform_data; + if (u3d->clock_gating && u3d->active) { + dev_dbg(u3d->dev, "disable u3d\n"); + if (pdata->phy_deinit) + pdata->phy_deinit(u3d->phy_regs); + clk_disable(u3d->clk); + u3d->active = 0; + } +} + +static int mv_u3d_vbus_session(struct usb_gadget *gadget, int is_active) +{ + struct mv_u3d *u3d; + unsigned long flags; + int retval = 0; + + u3d = container_of(gadget, struct mv_u3d, gadget); + + spin_lock_irqsave(&u3d->lock, flags); + + u3d->vbus_active = (is_active != 0); + dev_dbg(u3d->dev, "%s: softconnect %d, vbus_active %d\n", + __func__, u3d->softconnect, u3d->vbus_active); + /* + * 1. external VBUS detect: we can disable/enable clock on demand. + * 2. UDC VBUS detect: we have to enable clock all the time. + * 3. No VBUS detect: we have to enable clock all the time. + */ + if (u3d->driver && u3d->softconnect && u3d->vbus_active) { + retval = mv_u3d_enable(u3d); + if (retval == 0) { + /* + * after clock is disabled, we lost all the register + * context. We have to re-init registers + */ + mv_u3d_controller_reset(u3d); + mv_u3d_ep0_reset(u3d); + mv_u3d_controller_start(u3d); + } + } else if (u3d->driver && u3d->softconnect) { + if (!u3d->active) + goto out; + + /* stop all the transfer in queue*/ + mv_u3d_stop_activity(u3d, u3d->driver); + mv_u3d_controller_stop(u3d); + mv_u3d_disable(u3d); + } + +out: + spin_unlock_irqrestore(&u3d->lock, flags); + return retval; +} + +/* constrain controller's VBUS power usage + * This call is used by gadget drivers during SET_CONFIGURATION calls, + * reporting how much power the device may consume. For example, this + * could affect how quickly batteries are recharged. + * + * Returns zero on success, else negative errno. + */ +static int mv_u3d_vbus_draw(struct usb_gadget *gadget, unsigned mA) +{ + struct mv_u3d *u3d = container_of(gadget, struct mv_u3d, gadget); + + u3d->power = mA; + + return 0; +} + +static int mv_u3d_pullup(struct usb_gadget *gadget, int is_on) +{ + struct mv_u3d *u3d = container_of(gadget, struct mv_u3d, gadget); + unsigned long flags; + int retval = 0; + + spin_lock_irqsave(&u3d->lock, flags); + + dev_dbg(u3d->dev, "%s: softconnect %d, vbus_active %d\n", + __func__, u3d->softconnect, u3d->vbus_active); + u3d->softconnect = (is_on != 0); + if (u3d->driver && u3d->softconnect && u3d->vbus_active) { + retval = mv_u3d_enable(u3d); + if (retval == 0) { + /* + * after clock is disabled, we lost all the register + * context. We have to re-init registers + */ + mv_u3d_controller_reset(u3d); + mv_u3d_ep0_reset(u3d); + mv_u3d_controller_start(u3d); + } + } else if (u3d->driver && u3d->vbus_active) { + /* stop all the transfer in queue*/ + mv_u3d_stop_activity(u3d, u3d->driver); + mv_u3d_controller_stop(u3d); + mv_u3d_disable(u3d); + } + + spin_unlock_irqrestore(&u3d->lock, flags); + + return retval; +} + +static int mv_u3d_start(struct usb_gadget *g, + struct usb_gadget_driver *driver) +{ + struct mv_u3d *u3d = container_of(g, struct mv_u3d, gadget); + struct mv_usb_platform_data *pdata = u3d->dev->platform_data; + unsigned long flags; + + if (u3d->driver) + return -EBUSY; + + spin_lock_irqsave(&u3d->lock, flags); + + if (!u3d->clock_gating) { + clk_enable(u3d->clk); + if (pdata->phy_init) + pdata->phy_init(u3d->phy_regs); + } + + /* hook up the driver ... */ + driver->driver.bus = NULL; + u3d->driver = driver; + u3d->gadget.dev.driver = &driver->driver; + + u3d->ep0_dir = USB_DIR_OUT; + + spin_unlock_irqrestore(&u3d->lock, flags); + + u3d->vbus_valid_detect = 1; + + return 0; +} + +static int mv_u3d_stop(struct usb_gadget *g, + struct usb_gadget_driver *driver) +{ + struct mv_u3d *u3d = container_of(g, struct mv_u3d, gadget); + struct mv_usb_platform_data *pdata = u3d->dev->platform_data; + unsigned long flags; + + u3d->vbus_valid_detect = 0; + spin_lock_irqsave(&u3d->lock, flags); + + /* enable clock to access controller register */ + clk_enable(u3d->clk); + if (pdata->phy_init) + pdata->phy_init(u3d->phy_regs); + + mv_u3d_controller_stop(u3d); + /* stop all usb activities */ + u3d->gadget.speed = USB_SPEED_UNKNOWN; + mv_u3d_stop_activity(u3d, driver); + mv_u3d_disable(u3d); + + if (pdata->phy_deinit) + pdata->phy_deinit(u3d->phy_regs); + clk_disable(u3d->clk); + + spin_unlock_irqrestore(&u3d->lock, flags); + + u3d->gadget.dev.driver = NULL; + u3d->driver = NULL; + + return 0; +} + +/* device controller usb_gadget_ops structure */ +static const struct usb_gadget_ops mv_u3d_ops = { + /* notify controller that VBUS is powered or not */ + .vbus_session = mv_u3d_vbus_session, + + /* constrain controller's VBUS power usage */ + .vbus_draw = mv_u3d_vbus_draw, + + .pullup = mv_u3d_pullup, + .udc_start = mv_u3d_start, + .udc_stop = mv_u3d_stop, +}; + +static int mv_u3d_eps_init(struct mv_u3d *u3d) +{ + struct mv_u3d_ep *ep; + char name[14]; + int i; + + /* initialize ep0, ep0 in/out use eps[1] */ + ep = &u3d->eps[1]; + ep->u3d = u3d; + strncpy(ep->name, "ep0", sizeof(ep->name)); + ep->ep.name = ep->name; + ep->ep.ops = &mv_u3d_ep_ops; + ep->wedge = 0; + ep->ep.maxpacket = MV_U3D_EP0_MAX_PKT_SIZE; + ep->ep_num = 0; + ep->ep.desc = &mv_u3d_ep0_desc; + INIT_LIST_HEAD(&ep->queue); + INIT_LIST_HEAD(&ep->req_list); + ep->ep_type = USB_ENDPOINT_XFER_CONTROL; + + /* add ep0 ep_context */ + ep->ep_context = &u3d->ep_context[1]; + + /* initialize other endpoints */ + for (i = 2; i < u3d->max_eps * 2; i++) { + ep = &u3d->eps[i]; + if (i & 1) { + snprintf(name, sizeof(name), "ep%din", i >> 1); + ep->direction = MV_U3D_EP_DIR_IN; + } else { + snprintf(name, sizeof(name), "ep%dout", i >> 1); + ep->direction = MV_U3D_EP_DIR_OUT; + } + ep->u3d = u3d; + strncpy(ep->name, name, sizeof(ep->name)); + ep->ep.name = ep->name; + + ep->ep.ops = &mv_u3d_ep_ops; + ep->ep.maxpacket = (unsigned short) ~0; + ep->ep_num = i / 2; + + INIT_LIST_HEAD(&ep->queue); + list_add_tail(&ep->ep.ep_list, &u3d->gadget.ep_list); + + INIT_LIST_HEAD(&ep->req_list); + spin_lock_init(&ep->req_lock); + ep->ep_context = &u3d->ep_context[i]; + } + + return 0; +} + +/* delete all endpoint requests, called with spinlock held */ +static void mv_u3d_nuke(struct mv_u3d_ep *ep, int status) +{ + /* endpoint fifo flush */ + mv_u3d_ep_fifo_flush(&ep->ep); + + while (!list_empty(&ep->queue)) { + struct mv_u3d_req *req = NULL; + req = list_entry(ep->queue.next, struct mv_u3d_req, queue); + mv_u3d_done(ep, req, status); + } +} + +/* stop all USB activities */ +static +void mv_u3d_stop_activity(struct mv_u3d *u3d, struct usb_gadget_driver *driver) +{ + struct mv_u3d_ep *ep; + + mv_u3d_nuke(&u3d->eps[1], -ESHUTDOWN); + + list_for_each_entry(ep, &u3d->gadget.ep_list, ep.ep_list) { + mv_u3d_nuke(ep, -ESHUTDOWN); + } + + /* report disconnect; the driver is already quiesced */ + if (driver) { + spin_unlock(&u3d->lock); + driver->disconnect(&u3d->gadget); + spin_lock(&u3d->lock); + } +} + +static void mv_u3d_irq_process_error(struct mv_u3d *u3d) +{ + /* Increment the error count */ + u3d->errors++; + dev_err(u3d->dev, "%s\n", __func__); +} + +static void mv_u3d_irq_process_link_change(struct mv_u3d *u3d) +{ + u32 linkchange; + + linkchange = ioread32(&u3d->vuc_regs->linkchange); + iowrite32(linkchange, &u3d->vuc_regs->linkchange); + + dev_dbg(u3d->dev, "linkchange: 0x%x\n", linkchange); + + if (linkchange & MV_U3D_LINK_CHANGE_LINK_UP) { + dev_dbg(u3d->dev, "link up: ltssm state: 0x%x\n", + ioread32(&u3d->vuc_regs->ltssmstate)); + + u3d->usb_state = USB_STATE_DEFAULT; + u3d->ep0_dir = MV_U3D_EP_DIR_OUT; + u3d->ep0_state = MV_U3D_WAIT_FOR_SETUP; + + /* set speed */ + u3d->gadget.speed = USB_SPEED_SUPER; + } + + if (linkchange & MV_U3D_LINK_CHANGE_SUSPEND) { + dev_dbg(u3d->dev, "link suspend\n"); + u3d->resume_state = u3d->usb_state; + u3d->usb_state = USB_STATE_SUSPENDED; + } + + if (linkchange & MV_U3D_LINK_CHANGE_RESUME) { + dev_dbg(u3d->dev, "link resume\n"); + u3d->usb_state = u3d->resume_state; + u3d->resume_state = 0; + } + + if (linkchange & MV_U3D_LINK_CHANGE_WRESET) { + dev_dbg(u3d->dev, "warm reset\n"); + u3d->usb_state = USB_STATE_POWERED; + } + + if (linkchange & MV_U3D_LINK_CHANGE_HRESET) { + dev_dbg(u3d->dev, "hot reset\n"); + u3d->usb_state = USB_STATE_DEFAULT; + } + + if (linkchange & MV_U3D_LINK_CHANGE_INACT) + dev_dbg(u3d->dev, "inactive\n"); + + if (linkchange & MV_U3D_LINK_CHANGE_DISABLE_AFTER_U0) + dev_dbg(u3d->dev, "ss.disabled\n"); + + if (linkchange & MV_U3D_LINK_CHANGE_VBUS_INVALID) { + dev_dbg(u3d->dev, "vbus invalid\n"); + u3d->usb_state = USB_STATE_ATTACHED; + u3d->vbus_valid_detect = 1; + /* if external vbus detect is not supported, + * we handle it here. + */ + if (!u3d->vbus) { + spin_unlock(&u3d->lock); + mv_u3d_vbus_session(&u3d->gadget, 0); + spin_lock(&u3d->lock); + } + } +} + +static void mv_u3d_ch9setaddress(struct mv_u3d *u3d, + struct usb_ctrlrequest *setup) +{ + u32 tmp; + + if (u3d->usb_state != USB_STATE_DEFAULT) { + dev_err(u3d->dev, + "%s, cannot setaddr in this state (%d)\n", + __func__, u3d->usb_state); + goto err; + } + + u3d->dev_addr = (u8)setup->wValue; + + dev_dbg(u3d->dev, "%s: 0x%x\n", __func__, u3d->dev_addr); + + if (u3d->dev_addr > 127) { + dev_err(u3d->dev, + "%s, u3d address is wrong (out of range)\n", __func__); + u3d->dev_addr = 0; + goto err; + } + + /* update usb state */ + u3d->usb_state = USB_STATE_ADDRESS; + + /* set the new address */ + tmp = ioread32(&u3d->vuc_regs->devaddrtiebrkr); + tmp &= ~0x7F; + tmp |= (u32)u3d->dev_addr; + iowrite32(tmp, &u3d->vuc_regs->devaddrtiebrkr); + + return; +err: + mv_u3d_ep0_stall(u3d); +} + +static int mv_u3d_is_set_configuration(struct usb_ctrlrequest *setup) +{ + if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) + if (setup->bRequest == USB_REQ_SET_CONFIGURATION) + return 1; + + return 0; +} + +static void mv_u3d_handle_setup_packet(struct mv_u3d *u3d, u8 ep_num, + struct usb_ctrlrequest *setup) +{ + bool delegate = false; + + mv_u3d_nuke(&u3d->eps[ep_num * 2 + MV_U3D_EP_DIR_IN], -ESHUTDOWN); + + dev_dbg(u3d->dev, "SETUP %02x.%02x v%04x i%04x l%04x\n", + setup->bRequestType, setup->bRequest, + setup->wValue, setup->wIndex, setup->wLength); + + /* We process some stardard setup requests here */ + if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) { + switch (setup->bRequest) { + case USB_REQ_GET_STATUS: + delegate = true; + break; + + case USB_REQ_SET_ADDRESS: + mv_u3d_ch9setaddress(u3d, setup); + break; + + case USB_REQ_CLEAR_FEATURE: + delegate = true; + break; + + case USB_REQ_SET_FEATURE: + delegate = true; + break; + + default: + delegate = true; + } + } else + delegate = true; + + /* delegate USB standard requests to the gadget driver */ + if (delegate == true) { + /* USB requests handled by gadget */ + if (setup->wLength) { + /* DATA phase from gadget, STATUS phase from u3d */ + u3d->ep0_dir = (setup->bRequestType & USB_DIR_IN) + ? MV_U3D_EP_DIR_IN : MV_U3D_EP_DIR_OUT; + spin_unlock(&u3d->lock); + if (u3d->driver->setup(&u3d->gadget, + &u3d->local_setup_buff) < 0) { + dev_err(u3d->dev, "setup error!\n"); + mv_u3d_ep0_stall(u3d); + } + spin_lock(&u3d->lock); + } else { + /* no DATA phase, STATUS phase from gadget */ + u3d->ep0_dir = MV_U3D_EP_DIR_IN; + u3d->ep0_state = MV_U3D_STATUS_STAGE; + spin_unlock(&u3d->lock); + if (u3d->driver->setup(&u3d->gadget, + &u3d->local_setup_buff) < 0) + mv_u3d_ep0_stall(u3d); + spin_lock(&u3d->lock); + } + + if (mv_u3d_is_set_configuration(setup)) { + dev_dbg(u3d->dev, "u3d configured\n"); + u3d->usb_state = USB_STATE_CONFIGURED; + } + } +} + +static void mv_u3d_get_setup_data(struct mv_u3d *u3d, u8 ep_num, u8 *buffer_ptr) +{ + struct mv_u3d_ep_context *epcontext; + + epcontext = &u3d->ep_context[ep_num * 2 + MV_U3D_EP_DIR_IN]; + + /* Copy the setup packet to local buffer */ + memcpy(buffer_ptr, (u8 *) &epcontext->setup_buffer, 8); +} + +static void mv_u3d_irq_process_setup(struct mv_u3d *u3d) +{ + u32 tmp, i; + /* Process all Setup packet received interrupts */ + tmp = ioread32(&u3d->vuc_regs->setuplock); + if (tmp) { + for (i = 0; i < u3d->max_eps; i++) { + if (tmp & (1 << i)) { + mv_u3d_get_setup_data(u3d, i, + (u8 *)(&u3d->local_setup_buff)); + mv_u3d_handle_setup_packet(u3d, i, + &u3d->local_setup_buff); + } + } + } + + iowrite32(tmp, &u3d->vuc_regs->setuplock); +} + +static void mv_u3d_irq_process_tr_complete(struct mv_u3d *u3d) +{ + u32 tmp, bit_pos; + int i, ep_num = 0, direction = 0; + struct mv_u3d_ep *curr_ep; + struct mv_u3d_req *curr_req, *temp_req; + int status; + + tmp = ioread32(&u3d->vuc_regs->endcomplete); + + dev_dbg(u3d->dev, "tr_complete: ep: 0x%x\n", tmp); + if (!tmp) + return; + iowrite32(tmp, &u3d->vuc_regs->endcomplete); + + for (i = 0; i < u3d->max_eps * 2; i++) { + ep_num = i >> 1; + direction = i % 2; + + bit_pos = 1 << (ep_num + 16 * direction); + + if (!(bit_pos & tmp)) + continue; + + if (i == 0) + curr_ep = &u3d->eps[1]; + else + curr_ep = &u3d->eps[i]; + + /* remove req out of ep request list after completion */ + dev_dbg(u3d->dev, "tr comp: check req_list\n"); + spin_lock(&curr_ep->req_lock); + if (!list_empty(&curr_ep->req_list)) { + struct mv_u3d_req *req; + req = list_entry(curr_ep->req_list.next, + struct mv_u3d_req, list); + list_del_init(&req->list); + curr_ep->processing = 0; + } + spin_unlock(&curr_ep->req_lock); + + /* process the req queue until an uncomplete request */ + list_for_each_entry_safe(curr_req, temp_req, + &curr_ep->queue, queue) { + status = mv_u3d_process_ep_req(u3d, i, curr_req); + if (status) + break; + /* write back status to req */ + curr_req->req.status = status; + + /* ep0 request completion */ + if (ep_num == 0) { + mv_u3d_done(curr_ep, curr_req, 0); + break; + } else { + mv_u3d_done(curr_ep, curr_req, status); + } + } + + dev_dbg(u3d->dev, "call mv_u3d_start_queue from ep complete\n"); + mv_u3d_start_queue(curr_ep); + } +} + +static irqreturn_t mv_u3d_irq(int irq, void *dev) +{ + struct mv_u3d *u3d = (struct mv_u3d *)dev; + u32 status, intr; + u32 bridgesetting; + u32 trbunderrun; + + spin_lock(&u3d->lock); + + status = ioread32(&u3d->vuc_regs->intrcause); + intr = ioread32(&u3d->vuc_regs->intrenable); + status &= intr; + + if (status == 0) { + spin_unlock(&u3d->lock); + dev_err(u3d->dev, "irq error!\n"); + return IRQ_NONE; + } + + if (status & MV_U3D_USBINT_VBUS_VALID) { + bridgesetting = ioread32(&u3d->vuc_regs->bridgesetting); + if (bridgesetting & MV_U3D_BRIDGE_SETTING_VBUS_VALID) { + /* write vbus valid bit of bridge setting to clear */ + bridgesetting = MV_U3D_BRIDGE_SETTING_VBUS_VALID; + iowrite32(bridgesetting, &u3d->vuc_regs->bridgesetting); + dev_dbg(u3d->dev, "vbus valid\n"); + + u3d->usb_state = USB_STATE_POWERED; + u3d->vbus_valid_detect = 0; + /* if external vbus detect is not supported, + * we handle it here. + */ + if (!u3d->vbus) { + spin_unlock(&u3d->lock); + mv_u3d_vbus_session(&u3d->gadget, 1); + spin_lock(&u3d->lock); + } + } else + dev_err(u3d->dev, "vbus bit is not set\n"); + } + + /* RX data is already in the 16KB FIFO.*/ + if (status & MV_U3D_USBINT_UNDER_RUN) { + trbunderrun = ioread32(&u3d->vuc_regs->trbunderrun); + dev_err(u3d->dev, "under run, ep%d\n", trbunderrun); + iowrite32(trbunderrun, &u3d->vuc_regs->trbunderrun); + mv_u3d_irq_process_error(u3d); + } + + if (status & (MV_U3D_USBINT_RXDESC_ERR | MV_U3D_USBINT_TXDESC_ERR)) { + /* write one to clear */ + iowrite32(status & (MV_U3D_USBINT_RXDESC_ERR + | MV_U3D_USBINT_TXDESC_ERR), + &u3d->vuc_regs->intrcause); + dev_err(u3d->dev, "desc err 0x%x\n", status); + mv_u3d_irq_process_error(u3d); + } + + if (status & MV_U3D_USBINT_LINK_CHG) + mv_u3d_irq_process_link_change(u3d); + + if (status & MV_U3D_USBINT_TX_COMPLETE) + mv_u3d_irq_process_tr_complete(u3d); + + if (status & MV_U3D_USBINT_RX_COMPLETE) + mv_u3d_irq_process_tr_complete(u3d); + + if (status & MV_U3D_USBINT_SETUP) + mv_u3d_irq_process_setup(u3d); + + spin_unlock(&u3d->lock); + return IRQ_HANDLED; +} + +static void mv_u3d_gadget_release(struct device *dev) +{ + dev_dbg(dev, "%s\n", __func__); +} + +static __devexit int mv_u3d_remove(struct platform_device *dev) +{ + struct mv_u3d *u3d = platform_get_drvdata(dev); + + BUG_ON(u3d == NULL); + + usb_del_gadget_udc(&u3d->gadget); + + /* free memory allocated in probe */ + if (u3d->trb_pool) + dma_pool_destroy(u3d->trb_pool); + + if (u3d->ep_context) + dma_free_coherent(&dev->dev, u3d->ep_context_size, + u3d->ep_context, u3d->ep_context_dma); + + kfree(u3d->eps); + + if (u3d->irq) + free_irq(u3d->irq, &dev->dev); + + if (u3d->cap_regs) + iounmap(u3d->cap_regs); + u3d->cap_regs = NULL; + + kfree(u3d->status_req); + + clk_put(u3d->clk); + + device_unregister(&u3d->gadget.dev); + + platform_set_drvdata(dev, NULL); + + kfree(u3d); + + return 0; +} + +static int mv_u3d_probe(struct platform_device *dev) +{ + struct mv_u3d *u3d = NULL; + struct mv_usb_platform_data *pdata = dev->dev.platform_data; + int retval = 0; + struct resource *r; + size_t size; + + if (!dev->dev.platform_data) { + dev_err(&dev->dev, "missing platform_data\n"); + retval = -ENODEV; + goto err_pdata; + } + + u3d = kzalloc(sizeof(*u3d), GFP_KERNEL); + if (!u3d) { + dev_err(&dev->dev, "failed to allocate memory for u3d\n"); + retval = -ENOMEM; + goto err_alloc_private; + } + + spin_lock_init(&u3d->lock); + + platform_set_drvdata(dev, u3d); + + u3d->dev = &dev->dev; + u3d->vbus = pdata->vbus; + + u3d->clk = clk_get(&dev->dev, pdata->clkname[0]); + if (IS_ERR(u3d->clk)) { + retval = PTR_ERR(u3d->clk); + goto err_get_clk; + } + + r = platform_get_resource_byname(dev, IORESOURCE_MEM, "capregs"); + if (!r) { + dev_err(&dev->dev, "no I/O memory resource defined\n"); + retval = -ENODEV; + goto err_get_cap_regs; + } + + u3d->cap_regs = (struct mv_u3d_cap_regs __iomem *) + ioremap(r->start, resource_size(r)); + if (!u3d->cap_regs) { + dev_err(&dev->dev, "failed to map I/O memory\n"); + retval = -EBUSY; + goto err_map_cap_regs; + } else { + dev_dbg(&dev->dev, "cap_regs address: 0x%x/0x%x\n", + (unsigned int)r->start, (unsigned int)u3d->cap_regs); + } + + /* we will access controller register, so enable the u3d controller */ + clk_enable(u3d->clk); + + if (pdata->phy_init) { + retval = pdata->phy_init(u3d->phy_regs); + if (retval) { + dev_err(&dev->dev, "init phy error %d\n", retval); + goto err_u3d_enable; + } + } + + u3d->op_regs = (struct mv_u3d_op_regs __iomem *)((u32)u3d->cap_regs + + MV_U3D_USB3_OP_REGS_OFFSET); + + u3d->vuc_regs = (struct mv_u3d_vuc_regs __iomem *)((u32)u3d->cap_regs + + ioread32(&u3d->cap_regs->vuoff)); + + u3d->max_eps = 16; + + /* + * some platform will use usb to download image, it may not disconnect + * usb gadget before loading kernel. So first stop u3d here. + */ + mv_u3d_controller_stop(u3d); + iowrite32(0xFFFFFFFF, &u3d->vuc_regs->intrcause); + + if (pdata->phy_deinit) + pdata->phy_deinit(u3d->phy_regs); + clk_disable(u3d->clk); + + size = u3d->max_eps * sizeof(struct mv_u3d_ep_context) * 2; + size = (size + MV_U3D_EP_CONTEXT_ALIGNMENT - 1) + & ~(MV_U3D_EP_CONTEXT_ALIGNMENT - 1); + u3d->ep_context = dma_alloc_coherent(&dev->dev, size, + &u3d->ep_context_dma, GFP_KERNEL); + if (!u3d->ep_context) { + dev_err(&dev->dev, "allocate ep context memory failed\n"); + retval = -ENOMEM; + goto err_alloc_ep_context; + } + u3d->ep_context_size = size; + + /* create TRB dma_pool resource */ + u3d->trb_pool = dma_pool_create("u3d_trb", + &dev->dev, + sizeof(struct mv_u3d_trb_hw), + MV_U3D_TRB_ALIGNMENT, + MV_U3D_DMA_BOUNDARY); + + if (!u3d->trb_pool) { + retval = -ENOMEM; + goto err_alloc_trb_pool; + } + + size = u3d->max_eps * sizeof(struct mv_u3d_ep) * 2; + u3d->eps = kzalloc(size, GFP_KERNEL); + if (!u3d->eps) { + dev_err(&dev->dev, "allocate ep memory failed\n"); + retval = -ENOMEM; + goto err_alloc_eps; + } + + /* initialize ep0 status request structure */ + u3d->status_req = kzalloc(sizeof(struct mv_u3d_req) + 8, GFP_KERNEL); + if (!u3d->status_req) { + dev_err(&dev->dev, "allocate status_req memory failed\n"); + retval = -ENOMEM; + goto err_alloc_status_req; + } + INIT_LIST_HEAD(&u3d->status_req->queue); + + /* allocate a small amount of memory to get valid address */ + u3d->status_req->req.buf = (char *)u3d->status_req + + sizeof(struct mv_u3d_req); + u3d->status_req->req.dma = virt_to_phys(u3d->status_req->req.buf); + + u3d->resume_state = USB_STATE_NOTATTACHED; + u3d->usb_state = USB_STATE_ATTACHED; + u3d->ep0_dir = MV_U3D_EP_DIR_OUT; + u3d->remote_wakeup = 0; + + r = platform_get_resource(dev, IORESOURCE_IRQ, 0); + if (!r) { + dev_err(&dev->dev, "no IRQ resource defined\n"); + retval = -ENODEV; + goto err_get_irq; + } + u3d->irq = r->start; + if (request_irq(u3d->irq, mv_u3d_irq, + IRQF_DISABLED | IRQF_SHARED, driver_name, u3d)) { + u3d->irq = 0; + dev_err(&dev->dev, "Request irq %d for u3d failed\n", + u3d->irq); + retval = -ENODEV; + goto err_request_irq; + } + + /* initialize gadget structure */ + u3d->gadget.ops = &mv_u3d_ops; /* usb_gadget_ops */ + u3d->gadget.ep0 = &u3d->eps[1].ep; /* gadget ep0 */ + INIT_LIST_HEAD(&u3d->gadget.ep_list); /* ep_list */ + u3d->gadget.speed = USB_SPEED_UNKNOWN; /* speed */ + + /* the "gadget" abstracts/virtualizes the controller */ + dev_set_name(&u3d->gadget.dev, "gadget"); + u3d->gadget.dev.parent = &dev->dev; + u3d->gadget.dev.dma_mask = dev->dev.dma_mask; + u3d->gadget.dev.release = mv_u3d_gadget_release; + u3d->gadget.name = driver_name; /* gadget name */ + + retval = device_register(&u3d->gadget.dev); + if (retval) + goto err_register_gadget_device; + + mv_u3d_eps_init(u3d); + + /* external vbus detection */ + if (u3d->vbus) { + u3d->clock_gating = 1; + dev_err(&dev->dev, "external vbus detection\n"); + } + + if (!u3d->clock_gating) + u3d->vbus_active = 1; + + /* enable usb3 controller vbus detection */ + u3d->vbus_valid_detect = 1; + + retval = usb_add_gadget_udc(&dev->dev, &u3d->gadget); + if (retval) + goto err_unregister; + + dev_dbg(&dev->dev, "successful probe usb3 device %s clock gating.\n", + u3d->clock_gating ? "with" : "without"); + + return 0; + +err_unregister: + device_unregister(&u3d->gadget.dev); +err_register_gadget_device: + free_irq(u3d->irq, &dev->dev); +err_request_irq: +err_get_irq: + kfree(u3d->status_req); +err_alloc_status_req: + kfree(u3d->eps); +err_alloc_eps: + dma_pool_destroy(u3d->trb_pool); +err_alloc_trb_pool: + dma_free_coherent(&dev->dev, u3d->ep_context_size, + u3d->ep_context, u3d->ep_context_dma); +err_alloc_ep_context: + if (pdata->phy_deinit) + pdata->phy_deinit(u3d->phy_regs); + clk_disable(u3d->clk); +err_u3d_enable: + iounmap(u3d->cap_regs); +err_map_cap_regs: +err_get_cap_regs: +err_get_clk: + clk_put(u3d->clk); + platform_set_drvdata(dev, NULL); + kfree(u3d); +err_alloc_private: +err_pdata: + return retval; +} + +#ifdef CONFIG_PM +static int mv_u3d_suspend(struct device *dev) +{ + struct mv_u3d *u3d = dev_get_drvdata(dev); + + /* + * only cable is unplugged, usb can suspend. + * So do not care about clock_gating == 1, it is handled by + * vbus session. + */ + if (!u3d->clock_gating) { + mv_u3d_controller_stop(u3d); + + spin_lock_irq(&u3d->lock); + /* stop all usb activities */ + mv_u3d_stop_activity(u3d, u3d->driver); + spin_unlock_irq(&u3d->lock); + + mv_u3d_disable(u3d); + } + + return 0; +} + +static int mv_u3d_resume(struct device *dev) +{ + struct mv_u3d *u3d = dev_get_drvdata(dev); + int retval; + + if (!u3d->clock_gating) { + retval = mv_u3d_enable(u3d); + if (retval) + return retval; + + if (u3d->driver && u3d->softconnect) { + mv_u3d_controller_reset(u3d); + mv_u3d_ep0_reset(u3d); + mv_u3d_controller_start(u3d); + } + } + + return 0; +} + +SIMPLE_DEV_PM_OPS(mv_u3d_pm_ops, mv_u3d_suspend, mv_u3d_resume); +#endif + +static void mv_u3d_shutdown(struct platform_device *dev) +{ + struct mv_u3d *u3d = dev_get_drvdata(&dev->dev); + u32 tmp; + + tmp = ioread32(&u3d->op_regs->usbcmd); + tmp &= ~MV_U3D_CMD_RUN_STOP; + iowrite32(tmp, &u3d->op_regs->usbcmd); +} + +static struct platform_driver mv_u3d_driver = { + .probe = mv_u3d_probe, + .remove = __exit_p(mv_u3d_remove), + .shutdown = mv_u3d_shutdown, + .driver = { + .owner = THIS_MODULE, + .name = "mv-u3d", +#ifdef CONFIG_PM + .pm = &mv_u3d_pm_ops, +#endif + }, +}; + +module_platform_driver(mv_u3d_driver); +MODULE_ALIAS("platform:mv-u3d"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR("Yu Xu <yuxu@marvell.com>"); +MODULE_LICENSE("GPL"); |