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linux/drivers/usb/gadget/mv_u3d_core.c

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/*
* 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 "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 = 0;
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)
__releases(&ep->udc->lock)
__acquires(&ep->udc->lock)
{
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;
unsigned long flags;
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) */
spin_lock_irqsave(&u3d->lock, flags);
mv_u3d_nuke(ep, -ESHUTDOWN);
spin_unlock_irqrestore(&u3d->lock, flags);
/* 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%p\n",
__func__, _ep->name, 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%p,"
"req->req.complete: 0x%p, req->req.buf: 0x%p,"
"list_empty: 0x%x\n",
__func__, _req,
req->req.complete, req->req.buf,
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((unsigned long) 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 = dev_get_platdata(u3d->dev);
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 = dev_get_platdata(u3d->dev);
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 = dev_get_platdata(u3d->dev);
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->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 = dev_get_platdata(u3d->dev);
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->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)
__releases(&u3c->lock)
__acquires(&u3c->lock)
{
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 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, u3d);
if (u3d->cap_regs)
iounmap(u3d->cap_regs);
u3d->cap_regs = NULL;
kfree(u3d->status_req);
clk_put(u3d->clk);
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_get_platdata(&dev->dev);
int retval = 0;
struct resource *r;
size_t size;
if (!dev_get_platdata(&dev->dev)) {
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, NULL);
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%lx/0x%lx\n",
(unsigned long) r->start,
(unsigned long) 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 *)(u3d->cap_regs
+ MV_U3D_USB3_OP_REGS_OFFSET);
u3d->vuc_regs = (struct mv_u3d_vuc_regs __iomem *)(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 */
u3d->gadget.name = driver_name; /* gadget name */
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:
free_irq(u3d->irq, u3d);
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);
kfree(u3d);
err_alloc_private:
err_pdata:
return retval;
}
#ifdef CONFIG_PM_SLEEP
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;
}
#endif
static SIMPLE_DEV_PM_OPS(mv_u3d_pm_ops, mv_u3d_suspend, mv_u3d_resume);
static void mv_u3d_shutdown(struct platform_device *dev)
{
struct mv_u3d *u3d = platform_get_drvdata(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 = mv_u3d_remove,
.shutdown = mv_u3d_shutdown,
.driver = {
.owner = THIS_MODULE,
.name = "mv-u3d",
.pm = &mv_u3d_pm_ops,
},
};
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");
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