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linux-zen-desktop/drivers/usb/gadget/udc/aspeed-vhub/epn.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget
*
* epn.c - Generic endpoints management
*
* Copyright 2017 IBM Corporation
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/prefetch.h>
#include <linux/clk.h>
#include <linux/usb/gadget.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/dma-mapping.h>
#include "vhub.h"
#define EXTRA_CHECKS
#ifdef EXTRA_CHECKS
#define CHECK(ep, expr, fmt...) \
do { \
if (!(expr)) EPDBG(ep, "CHECK:" fmt); \
} while(0)
#else
#define CHECK(ep, expr, fmt...) do { } while(0)
#endif
static void ast_vhub_epn_kick(struct ast_vhub_ep *ep, struct ast_vhub_req *req)
{
unsigned int act = req->req.actual;
unsigned int len = req->req.length;
unsigned int chunk;
/* There should be no DMA ongoing */
WARN_ON(req->active);
/* Calculate next chunk size */
chunk = len - act;
if (chunk > ep->ep.maxpacket)
chunk = ep->ep.maxpacket;
else if ((chunk < ep->ep.maxpacket) || !req->req.zero)
req->last_desc = 1;
EPVDBG(ep, "kick req %p act=%d/%d chunk=%d last=%d\n",
req, act, len, chunk, req->last_desc);
/* If DMA unavailable, using staging EP buffer */
if (!req->req.dma) {
/* For IN transfers, copy data over first */
if (ep->epn.is_in) {
memcpy(ep->buf, req->req.buf + act, chunk);
vhub_dma_workaround(ep->buf);
}
writel(ep->buf_dma, ep->epn.regs + AST_VHUB_EP_DESC_BASE);
} else {
if (ep->epn.is_in)
vhub_dma_workaround(req->req.buf);
writel(req->req.dma + act, ep->epn.regs + AST_VHUB_EP_DESC_BASE);
}
/* Start DMA */
req->active = true;
writel(VHUB_EP_DMA_SET_TX_SIZE(chunk),
ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
writel(VHUB_EP_DMA_SET_TX_SIZE(chunk) | VHUB_EP_DMA_SINGLE_KICK,
ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
}
static void ast_vhub_epn_handle_ack(struct ast_vhub_ep *ep)
{
struct ast_vhub_req *req;
unsigned int len;
int status = 0;
u32 stat;
/* Read EP status */
stat = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
/* Grab current request if any */
req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue);
EPVDBG(ep, "ACK status=%08x is_in=%d, req=%p (active=%d)\n",
stat, ep->epn.is_in, req, req ? req->active : 0);
/* In absence of a request, bail out, must have been dequeued */
if (!req)
return;
/*
* Request not active, move on to processing queue, active request
* was probably dequeued
*/
if (!req->active)
goto next_chunk;
/* Check if HW has moved on */
if (VHUB_EP_DMA_RPTR(stat) != 0) {
EPDBG(ep, "DMA read pointer not 0 !\n");
return;
}
/* No current DMA ongoing */
req->active = false;
/* Grab length out of HW */
len = VHUB_EP_DMA_TX_SIZE(stat);
/* If not using DMA, copy data out if needed */
if (!req->req.dma && !ep->epn.is_in && len) {
if (req->req.actual + len > req->req.length) {
req->last_desc = 1;
status = -EOVERFLOW;
goto done;
} else {
memcpy(req->req.buf + req->req.actual, ep->buf, len);
}
}
/* Adjust size */
req->req.actual += len;
/* Check for short packet */
if (len < ep->ep.maxpacket)
req->last_desc = 1;
done:
/* That's it ? complete the request and pick a new one */
if (req->last_desc >= 0) {
ast_vhub_done(ep, req, status);
req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req,
queue);
/*
* Due to lock dropping inside "done" the next request could
* already be active, so check for that and bail if needed.
*/
if (!req || req->active)
return;
}
next_chunk:
ast_vhub_epn_kick(ep, req);
}
static inline unsigned int ast_vhub_count_free_descs(struct ast_vhub_ep *ep)
{
/*
* d_next == d_last means descriptor list empty to HW,
* thus we can only have AST_VHUB_DESCS_COUNT-1 descriptors
* in the list
*/
return (ep->epn.d_last + AST_VHUB_DESCS_COUNT - ep->epn.d_next - 1) &
(AST_VHUB_DESCS_COUNT - 1);
}
static void ast_vhub_epn_kick_desc(struct ast_vhub_ep *ep,
struct ast_vhub_req *req)
{
struct ast_vhub_desc *desc = NULL;
unsigned int act = req->act_count;
unsigned int len = req->req.length;
unsigned int chunk;
/* Mark request active if not already */
req->active = true;
/* If the request was already completely written, do nothing */
if (req->last_desc >= 0)
return;
EPVDBG(ep, "kick act=%d/%d chunk_max=%d free_descs=%d\n",
act, len, ep->epn.chunk_max, ast_vhub_count_free_descs(ep));
/* While we can create descriptors */
while (ast_vhub_count_free_descs(ep) && req->last_desc < 0) {
unsigned int d_num;
/* Grab next free descriptor */
d_num = ep->epn.d_next;
desc = &ep->epn.descs[d_num];
ep->epn.d_next = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1);
/* Calculate next chunk size */
chunk = len - act;
if (chunk <= ep->epn.chunk_max) {
/*
* Is this the last packet ? Because of having up to 8
* packets in a descriptor we can't just compare "chunk"
* with ep.maxpacket. We have to see if it's a multiple
* of it to know if we have to send a zero packet.
* Sadly that involves a modulo which is a bit expensive
* but probably still better than not doing it.
*/
if (!chunk || !req->req.zero || (chunk % ep->ep.maxpacket) != 0)
req->last_desc = d_num;
} else {
chunk = ep->epn.chunk_max;
}
EPVDBG(ep, " chunk: act=%d/%d chunk=%d last=%d desc=%d free=%d\n",
act, len, chunk, req->last_desc, d_num,
ast_vhub_count_free_descs(ep));
/* Populate descriptor */
desc->w0 = cpu_to_le32(req->req.dma + act);
/* Interrupt if end of request or no more descriptors */
/*
* TODO: Be smarter about it, if we don't have enough
* descriptors request an interrupt before queue empty
* or so in order to be able to populate more before
* the HW runs out. This isn't a problem at the moment
* as we use 256 descriptors and only put at most one
* request in the ring.
*/
desc->w1 = cpu_to_le32(VHUB_DSC1_IN_SET_LEN(chunk));
if (req->last_desc >= 0 || !ast_vhub_count_free_descs(ep))
desc->w1 |= cpu_to_le32(VHUB_DSC1_IN_INTERRUPT);
/* Account packet */
req->act_count = act = act + chunk;
}
if (likely(desc))
vhub_dma_workaround(desc);
/* Tell HW about new descriptors */
writel(VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next),
ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
EPVDBG(ep, "HW kicked, d_next=%d dstat=%08x\n",
ep->epn.d_next, readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS));
}
static void ast_vhub_epn_handle_ack_desc(struct ast_vhub_ep *ep)
{
struct ast_vhub_req *req;
unsigned int len, d_last;
u32 stat, stat1;
/* Read EP status, workaround HW race */
do {
stat = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
stat1 = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
} while(stat != stat1);
/* Extract RPTR */
d_last = VHUB_EP_DMA_RPTR(stat);
/* Grab current request if any */
req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue);
EPVDBG(ep, "ACK status=%08x is_in=%d ep->d_last=%d..%d\n",
stat, ep->epn.is_in, ep->epn.d_last, d_last);
/* Check all completed descriptors */
while (ep->epn.d_last != d_last) {
struct ast_vhub_desc *desc;
unsigned int d_num;
bool is_last_desc;
/* Grab next completed descriptor */
d_num = ep->epn.d_last;
desc = &ep->epn.descs[d_num];
ep->epn.d_last = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1);
/* Grab len out of descriptor */
len = VHUB_DSC1_IN_LEN(le32_to_cpu(desc->w1));
EPVDBG(ep, " desc %d len=%d req=%p (act=%d)\n",
d_num, len, req, req ? req->active : 0);
/* If no active request pending, move on */
if (!req || !req->active)
continue;
/* Adjust size */
req->req.actual += len;
/* Is that the last chunk ? */
is_last_desc = req->last_desc == d_num;
CHECK(ep, is_last_desc == (len < ep->ep.maxpacket ||
(req->req.actual >= req->req.length &&
!req->req.zero)),
"Last packet discrepancy: last_desc=%d len=%d r.act=%d "
"r.len=%d r.zero=%d mp=%d\n",
is_last_desc, len, req->req.actual, req->req.length,
req->req.zero, ep->ep.maxpacket);
if (is_last_desc) {
/*
* Because we can only have one request at a time
* in our descriptor list in this implementation,
* d_last and ep->d_last should now be equal
*/
CHECK(ep, d_last == ep->epn.d_last,
"DMA read ptr mismatch %d vs %d\n",
d_last, ep->epn.d_last);
/* Note: done will drop and re-acquire the lock */
ast_vhub_done(ep, req, 0);
req = list_first_entry_or_null(&ep->queue,
struct ast_vhub_req,
queue);
break;
}
}
/* More work ? */
if (req)
ast_vhub_epn_kick_desc(ep, req);
}
void ast_vhub_epn_ack_irq(struct ast_vhub_ep *ep)
{
if (ep->epn.desc_mode)
ast_vhub_epn_handle_ack_desc(ep);
else
ast_vhub_epn_handle_ack(ep);
}
static int ast_vhub_epn_queue(struct usb_ep* u_ep, struct usb_request *u_req,
gfp_t gfp_flags)
{
struct ast_vhub_req *req = to_ast_req(u_req);
struct ast_vhub_ep *ep = to_ast_ep(u_ep);
struct ast_vhub *vhub = ep->vhub;
unsigned long flags;
bool empty;
int rc;
/* Paranoid checks */
if (!u_req || !u_req->complete || !u_req->buf) {
dev_warn(&vhub->pdev->dev, "Bogus EPn request ! u_req=%p\n", u_req);
if (u_req) {
dev_warn(&vhub->pdev->dev, "complete=%p internal=%d\n",
u_req->complete, req->internal);
}
return -EINVAL;
}
/* Endpoint enabled ? */
if (!ep->epn.enabled || !u_ep->desc || !ep->dev || !ep->d_idx ||
!ep->dev->enabled) {
EPDBG(ep, "Enqueuing request on wrong or disabled EP\n");
return -ESHUTDOWN;
}
/* Map request for DMA if possible. For now, the rule for DMA is
* that:
*
* * For single stage mode (no descriptors):
*
* - The buffer is aligned to a 8 bytes boundary (HW requirement)
* - For a OUT endpoint, the request size is a multiple of the EP
* packet size (otherwise the controller will DMA past the end
* of the buffer if the host is sending a too long packet).
*
* * For descriptor mode (tx only for now), always.
*
* We could relax the latter by making the decision to use the bounce
* buffer based on the size of a given *segment* of the request rather
* than the whole request.
*/
if (ep->epn.desc_mode ||
((((unsigned long)u_req->buf & 7) == 0) &&
(ep->epn.is_in || !(u_req->length & (u_ep->maxpacket - 1))))) {
rc = usb_gadget_map_request_by_dev(&vhub->pdev->dev, u_req,
ep->epn.is_in);
if (rc) {
dev_warn(&vhub->pdev->dev,
"Request mapping failure %d\n", rc);
return rc;
}
} else
u_req->dma = 0;
EPVDBG(ep, "enqueue req @%p\n", req);
EPVDBG(ep, " l=%d dma=0x%x zero=%d noshort=%d noirq=%d is_in=%d\n",
u_req->length, (u32)u_req->dma, u_req->zero,
u_req->short_not_ok, u_req->no_interrupt,
ep->epn.is_in);
/* Initialize request progress fields */
u_req->status = -EINPROGRESS;
u_req->actual = 0;
req->act_count = 0;
req->active = false;
req->last_desc = -1;
spin_lock_irqsave(&vhub->lock, flags);
empty = list_empty(&ep->queue);
/* Add request to list and kick processing if empty */
list_add_tail(&req->queue, &ep->queue);
if (empty) {
if (ep->epn.desc_mode)
ast_vhub_epn_kick_desc(ep, req);
else
ast_vhub_epn_kick(ep, req);
}
spin_unlock_irqrestore(&vhub->lock, flags);
return 0;
}
static void ast_vhub_stop_active_req(struct ast_vhub_ep *ep,
bool restart_ep)
{
u32 state, reg, loops;
/* Stop DMA activity */
if (ep->epn.desc_mode)
writel(VHUB_EP_DMA_CTRL_RESET, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
else
writel(0, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
/* Wait for it to complete */
for (loops = 0; loops < 1000; loops++) {
state = readl(ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
state = VHUB_EP_DMA_PROC_STATUS(state);
if (state == EP_DMA_PROC_RX_IDLE ||
state == EP_DMA_PROC_TX_IDLE)
break;
udelay(1);
}
if (loops >= 1000)
dev_warn(&ep->vhub->pdev->dev, "Timeout waiting for DMA\n");
/* If we don't have to restart the endpoint, that's it */
if (!restart_ep)
return;
/* Restart the endpoint */
if (ep->epn.desc_mode) {
/*
* Take out descriptors by resetting the DMA read
* pointer to be equal to the CPU write pointer.
*
* Note: If we ever support creating descriptors for
* requests that aren't the head of the queue, we
* may have to do something more complex here,
* especially if the request being taken out is
* not the current head descriptors.
*/
reg = VHUB_EP_DMA_SET_RPTR(ep->epn.d_next) |
VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next);
writel(reg, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
/* Then turn it back on */
writel(ep->epn.dma_conf,
ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
} else {
/* Single mode: just turn it back on */
writel(ep->epn.dma_conf,
ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
}
}
static int ast_vhub_epn_dequeue(struct usb_ep* u_ep, struct usb_request *u_req)
{
struct ast_vhub_ep *ep = to_ast_ep(u_ep);
struct ast_vhub *vhub = ep->vhub;
struct ast_vhub_req *req = NULL, *iter;
unsigned long flags;
int rc = -EINVAL;
spin_lock_irqsave(&vhub->lock, flags);
/* Make sure it's actually queued on this endpoint */
list_for_each_entry(iter, &ep->queue, queue) {
if (&iter->req != u_req)
continue;
req = iter;
break;
}
if (req) {
EPVDBG(ep, "dequeue req @%p active=%d\n",
req, req->active);
if (req->active)
ast_vhub_stop_active_req(ep, true);
ast_vhub_done(ep, req, -ECONNRESET);
rc = 0;
}
spin_unlock_irqrestore(&vhub->lock, flags);
return rc;
}
void ast_vhub_update_epn_stall(struct ast_vhub_ep *ep)
{
u32 reg;
if (WARN_ON(ep->d_idx == 0))
return;
reg = readl(ep->epn.regs + AST_VHUB_EP_CONFIG);
if (ep->epn.stalled || ep->epn.wedged)
reg |= VHUB_EP_CFG_STALL_CTRL;
else
reg &= ~VHUB_EP_CFG_STALL_CTRL;
writel(reg, ep->epn.regs + AST_VHUB_EP_CONFIG);
if (!ep->epn.stalled && !ep->epn.wedged)
writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx),
ep->vhub->regs + AST_VHUB_EP_TOGGLE);
}
static int ast_vhub_set_halt_and_wedge(struct usb_ep* u_ep, bool halt,
bool wedge)
{
struct ast_vhub_ep *ep = to_ast_ep(u_ep);
struct ast_vhub *vhub = ep->vhub;
unsigned long flags;
EPDBG(ep, "Set halt (%d) & wedge (%d)\n", halt, wedge);
if (!u_ep || !u_ep->desc)
return -EINVAL;
if (ep->d_idx == 0)
return 0;
if (ep->epn.is_iso)
return -EOPNOTSUPP;
spin_lock_irqsave(&vhub->lock, flags);
/* Fail with still-busy IN endpoints */
if (halt && ep->epn.is_in && !list_empty(&ep->queue)) {
spin_unlock_irqrestore(&vhub->lock, flags);
return -EAGAIN;
}
ep->epn.stalled = halt;
ep->epn.wedged = wedge;
ast_vhub_update_epn_stall(ep);
spin_unlock_irqrestore(&vhub->lock, flags);
return 0;
}
static int ast_vhub_epn_set_halt(struct usb_ep *u_ep, int value)
{
return ast_vhub_set_halt_and_wedge(u_ep, value != 0, false);
}
static int ast_vhub_epn_set_wedge(struct usb_ep *u_ep)
{
return ast_vhub_set_halt_and_wedge(u_ep, true, true);
}
static int ast_vhub_epn_disable(struct usb_ep* u_ep)
{
struct ast_vhub_ep *ep = to_ast_ep(u_ep);
struct ast_vhub *vhub = ep->vhub;
unsigned long flags;
u32 imask, ep_ier;
EPDBG(ep, "Disabling !\n");
spin_lock_irqsave(&vhub->lock, flags);
ep->epn.enabled = false;
/* Stop active DMA if any */
ast_vhub_stop_active_req(ep, false);
/* Disable endpoint */
writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG);
/* Disable ACK interrupt */
imask = VHUB_EP_IRQ(ep->epn.g_idx);
ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER);
ep_ier &= ~imask;
writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER);
writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR);
/* Nuke all pending requests */
ast_vhub_nuke(ep, -ESHUTDOWN);
/* No more descriptor associated with request */
ep->ep.desc = NULL;
spin_unlock_irqrestore(&vhub->lock, flags);
return 0;
}
static int ast_vhub_epn_enable(struct usb_ep* u_ep,
const struct usb_endpoint_descriptor *desc)
{
struct ast_vhub_ep *ep = to_ast_ep(u_ep);
struct ast_vhub_dev *dev;
struct ast_vhub *vhub;
u16 maxpacket, type;
unsigned long flags;
u32 ep_conf, ep_ier, imask;
/* Check arguments */
if (!u_ep || !desc)
return -EINVAL;
maxpacket = usb_endpoint_maxp(desc);
if (!ep->d_idx || !ep->dev ||
desc->bDescriptorType != USB_DT_ENDPOINT ||
maxpacket == 0 || maxpacket > ep->ep.maxpacket) {
EPDBG(ep, "Invalid EP enable,d_idx=%d,dev=%p,type=%d,mp=%d/%d\n",
ep->d_idx, ep->dev, desc->bDescriptorType,
maxpacket, ep->ep.maxpacket);
return -EINVAL;
}
if (ep->d_idx != usb_endpoint_num(desc)) {
EPDBG(ep, "EP number mismatch !\n");
return -EINVAL;
}
if (ep->epn.enabled) {
EPDBG(ep, "Already enabled\n");
return -EBUSY;
}
dev = ep->dev;
vhub = ep->vhub;
/* Check device state */
if (!dev->driver) {
EPDBG(ep, "Bogus device state: driver=%p speed=%d\n",
dev->driver, dev->gadget.speed);
return -ESHUTDOWN;
}
/* Grab some info from the descriptor */
ep->epn.is_in = usb_endpoint_dir_in(desc);
ep->ep.maxpacket = maxpacket;
type = usb_endpoint_type(desc);
ep->epn.d_next = ep->epn.d_last = 0;
ep->epn.is_iso = false;
ep->epn.stalled = false;
ep->epn.wedged = false;
EPDBG(ep, "Enabling [%s] %s num %d maxpacket=%d\n",
ep->epn.is_in ? "in" : "out", usb_ep_type_string(type),
usb_endpoint_num(desc), maxpacket);
/* Can we use DMA descriptor mode ? */
ep->epn.desc_mode = ep->epn.descs && ep->epn.is_in;
if (ep->epn.desc_mode)
memset(ep->epn.descs, 0, 8 * AST_VHUB_DESCS_COUNT);
/*
* Large send function can send up to 8 packets from
* one descriptor with a limit of 4095 bytes.
*/
ep->epn.chunk_max = ep->ep.maxpacket;
if (ep->epn.is_in) {
ep->epn.chunk_max <<= 3;
while (ep->epn.chunk_max > 4095)
ep->epn.chunk_max -= ep->ep.maxpacket;
}
switch(type) {
case USB_ENDPOINT_XFER_CONTROL:
EPDBG(ep, "Only one control endpoint\n");
return -EINVAL;
case USB_ENDPOINT_XFER_INT:
ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_INT);
break;
case USB_ENDPOINT_XFER_BULK:
ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_BULK);
break;
case USB_ENDPOINT_XFER_ISOC:
ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_ISO);
ep->epn.is_iso = true;
break;
default:
return -EINVAL;
}
/* Encode the rest of the EP config register */
if (maxpacket < 1024)
ep_conf |= VHUB_EP_CFG_SET_MAX_PKT(maxpacket);
if (!ep->epn.is_in)
ep_conf |= VHUB_EP_CFG_DIR_OUT;
ep_conf |= VHUB_EP_CFG_SET_EP_NUM(usb_endpoint_num(desc));
ep_conf |= VHUB_EP_CFG_ENABLE;
ep_conf |= VHUB_EP_CFG_SET_DEV(dev->index + 1);
EPVDBG(ep, "config=%08x\n", ep_conf);
spin_lock_irqsave(&vhub->lock, flags);
/* Disable HW and reset DMA */
writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG);
writel(VHUB_EP_DMA_CTRL_RESET,
ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
/* Configure and enable */
writel(ep_conf, ep->epn.regs + AST_VHUB_EP_CONFIG);
if (ep->epn.desc_mode) {
/* Clear DMA status, including the DMA read ptr */
writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
/* Set descriptor base */
writel(ep->epn.descs_dma,
ep->epn.regs + AST_VHUB_EP_DESC_BASE);
/* Set base DMA config value */
ep->epn.dma_conf = VHUB_EP_DMA_DESC_MODE;
if (ep->epn.is_in)
ep->epn.dma_conf |= VHUB_EP_DMA_IN_LONG_MODE;
/* First reset and disable all operations */
writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET,
ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
/* Enable descriptor mode */
writel(ep->epn.dma_conf,
ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
} else {
/* Set base DMA config value */
ep->epn.dma_conf = VHUB_EP_DMA_SINGLE_STAGE;
/* Reset and switch to single stage mode */
writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET,
ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
writel(ep->epn.dma_conf,
ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT);
writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS);
}
/* Cleanup data toggle just in case */
writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx),
vhub->regs + AST_VHUB_EP_TOGGLE);
/* Cleanup and enable ACK interrupt */
imask = VHUB_EP_IRQ(ep->epn.g_idx);
writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR);
ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER);
ep_ier |= imask;
writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER);
/* Woot, we are online ! */
ep->epn.enabled = true;
spin_unlock_irqrestore(&vhub->lock, flags);
return 0;
}
static void ast_vhub_epn_dispose(struct usb_ep *u_ep)
{
struct ast_vhub_ep *ep = to_ast_ep(u_ep);
if (WARN_ON(!ep->dev || !ep->d_idx))
return;
EPDBG(ep, "Releasing endpoint\n");
/* Take it out of the EP list */
list_del_init(&ep->ep.ep_list);
/* Mark the address free in the device */
ep->dev->epns[ep->d_idx - 1] = NULL;
/* Free name & DMA buffers */
kfree(ep->ep.name);
ep->ep.name = NULL;
dma_free_coherent(&ep->vhub->pdev->dev,
AST_VHUB_EPn_MAX_PACKET +
8 * AST_VHUB_DESCS_COUNT,
ep->buf, ep->buf_dma);
ep->buf = NULL;
ep->epn.descs = NULL;
/* Mark free */
ep->dev = NULL;
}
static const struct usb_ep_ops ast_vhub_epn_ops = {
.enable = ast_vhub_epn_enable,
.disable = ast_vhub_epn_disable,
.dispose = ast_vhub_epn_dispose,
.queue = ast_vhub_epn_queue,
.dequeue = ast_vhub_epn_dequeue,
.set_halt = ast_vhub_epn_set_halt,
.set_wedge = ast_vhub_epn_set_wedge,
.alloc_request = ast_vhub_alloc_request,
.free_request = ast_vhub_free_request,
};
struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8 addr)
{
struct ast_vhub *vhub = d->vhub;
struct ast_vhub_ep *ep;
unsigned long flags;
int i;
/* Find a free one (no device) */
spin_lock_irqsave(&vhub->lock, flags);
for (i = 0; i < vhub->max_epns; i++)
if (vhub->epns[i].dev == NULL)
break;
if (i >= vhub->max_epns) {
spin_unlock_irqrestore(&vhub->lock, flags);
return NULL;
}
/* Set it up */
ep = &vhub->epns[i];
ep->dev = d;
spin_unlock_irqrestore(&vhub->lock, flags);
DDBG(d, "Allocating gen EP %d for addr %d\n", i, addr);
INIT_LIST_HEAD(&ep->queue);
ep->d_idx = addr;
ep->vhub = vhub;
ep->ep.ops = &ast_vhub_epn_ops;
ep->ep.name = kasprintf(GFP_KERNEL, "ep%d", addr);
d->epns[addr-1] = ep;
ep->epn.g_idx = i;
ep->epn.regs = vhub->regs + 0x200 + (i * 0x10);
ep->buf = dma_alloc_coherent(&vhub->pdev->dev,
AST_VHUB_EPn_MAX_PACKET +
8 * AST_VHUB_DESCS_COUNT,
&ep->buf_dma, GFP_KERNEL);
if (!ep->buf) {
kfree(ep->ep.name);
ep->ep.name = NULL;
return NULL;
}
ep->epn.descs = ep->buf + AST_VHUB_EPn_MAX_PACKET;
ep->epn.descs_dma = ep->buf_dma + AST_VHUB_EPn_MAX_PACKET;
usb_ep_set_maxpacket_limit(&ep->ep, AST_VHUB_EPn_MAX_PACKET);
list_add_tail(&ep->ep.ep_list, &d->gadget.ep_list);
ep->ep.caps.type_iso = true;
ep->ep.caps.type_bulk = true;
ep->ep.caps.type_int = true;
ep->ep.caps.dir_in = true;
ep->ep.caps.dir_out = true;
return ep;
}
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