// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C USB2.0 High-speed / OtG driver
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/phy.h>
#include <linux/usb/composite.h>
#include "core.h"
#include "hw.h"
/* conversion functions */
static inline struct dwc2_hsotg_req *our_req(
struct usb_request *req)
{
return container_of(req,
struct dwc2_hsotg_req, req);
}
static inline struct dwc2_hsotg_ep *our_ep(
struct usb_ep *ep)
{
return container_of(ep,
struct dwc2_hsotg_ep, ep);
}
static inline struct dwc2_hsotg *to_hsotg(
struct usb_gadget *gadget)
{
return container_of(gadget,
struct dwc2_hsotg, gadget);
}
static inline void dwc2_set_bit(
struct dwc2_hsotg *hsotg, u32 offset, u32 val)
{
dwc2_writel(hsotg, dwc2_readl(hsotg, offset) | val, offset);
}
static inline void dwc2_clear_bit(
struct dwc2_hsotg *hsotg, u32 offset, u32 val)
{
dwc2_writel(hsotg, dwc2_readl(hsotg, offset) & ~val, offset);
}
static inline struct dwc2_hsotg_ep *index_to_ep(
struct dwc2_hsotg *hsotg,
u32 ep_index, u32 dir_in)
{
if (dir_in)
return hsotg->eps_in[ep_index];
else
return hsotg->eps_out[ep_index];
}
/* forward declaration of functions */
static void dwc2_hsotg_dump(
struct dwc2_hsotg *hsotg);
/**
* using_dma - return the DMA status of the driver.
* @hsotg: The driver state.
*
* Return true if we're using DMA.
*
* Currently, we have the DMA support code worked into everywhere
* that needs it, but the AMBA DMA implementation in the hardware can
* only DMA from 32bit aligned addresses. This means that gadgets such
* as the CDC Ethernet cannot work as they often pass packets which are
* not 32bit aligned.
*
* Unfortunately the choice to use DMA or not is global to the controller
* and seems to be only settable when the controller is being put through
* a core reset. This means we either need to fix the gadgets to take
* account of DMA alignment, or add bounce buffers (yuerk).
*
* g_using_dma is set depending on dts flag.
*/
static inline bool using_dma(
struct dwc2_hsotg *hsotg)
{
return hsotg->params.g_dma;
}
/*
* using_desc_dma - return the descriptor DMA status of the driver.
* @hsotg: The driver state.
*
* Return true if we're using descriptor DMA.
*/
static inline bool using_desc_dma(
struct dwc2_hsotg *hsotg)
{
return hsotg->params.g_dma_desc;
}
/**
* dwc2_gadget_incr_frame_num - Increments the targeted frame number.
* @hs_ep: The endpoint
*
* This function will also check if the frame number overruns DSTS_SOFFN_LIMIT.
* If an overrun occurs it will wrap the value and set the frame_overrun flag.
*/
static inline void dwc2_gadget_incr_frame_num(
struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
u16 limit = DSTS_SOFFN_LIMIT;
if (hsotg->gadget.speed != USB_SPEED_HIGH)
limit >>= 3;
hs_ep->target_frame += hs_ep->interval;
if (hs_ep->target_frame > limit) {
hs_ep->frame_overrun =
true;
hs_ep->target_frame &= limit;
}
else {
hs_ep->frame_overrun =
false;
}
}
/**
* dwc2_gadget_dec_frame_num_by_one - Decrements the targeted frame number
* by one.
* @hs_ep: The endpoint.
*
* This function used in service interval based scheduling flow to calculate
* descriptor frame number filed value. For service interval mode frame
* number in descriptor should point to last (u)frame in the interval.
*
*/
static inline void dwc2_gadget_dec_frame_num_by_one(
struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
u16 limit = DSTS_SOFFN_LIMIT;
if (hsotg->gadget.speed != USB_SPEED_HIGH)
limit >>= 3;
if (hs_ep->target_frame)
hs_ep->target_frame -= 1;
else
hs_ep->target_frame = limit;
}
/**
* dwc2_hsotg_en_gsint - enable one or more of the general interrupt
* @hsotg: The device state
* @ints: A bitmask of the interrupts to enable
*/
static void dwc2_hsotg_en_gsint(
struct dwc2_hsotg *hsotg, u32 ints)
{
u32 gsintmsk = dwc2_readl(hsotg, GINTMSK);
u32 new_gsintmsk;
new_gsintmsk = gsintmsk | ints;
if (new_gsintmsk != gsintmsk) {
dev_dbg(hsotg->dev,
"gsintmsk now 0x%08x\n", new_gsintmsk);
dwc2_writel(hsotg, new_gsintmsk, GINTMSK);
}
}
/**
* dwc2_hsotg_disable_gsint - disable one or more of the general interrupt
* @hsotg: The device state
* @ints: A bitmask of the interrupts to enable
*/
static void dwc2_hsotg_disable_gsint(
struct dwc2_hsotg *hsotg, u32 ints)
{
u32 gsintmsk = dwc2_readl(hsotg, GINTMSK);
u32 new_gsintmsk;
new_gsintmsk = gsintmsk & ~ints;
if (new_gsintmsk != gsintmsk)
dwc2_writel(hsotg, new_gsintmsk, GINTMSK);
}
/**
* dwc2_hsotg_ctrl_epint - enable/disable an endpoint irq
* @hsotg: The device state
* @ep: The endpoint index
* @dir_in: True if direction is in.
* @en: The enable value, true to enable
*
* Set or clear the mask for an individual endpoint's interrupt
* request.
*/
static void dwc2_hsotg_ctrl_epint(
struct dwc2_hsotg *hsotg,
unsigned int ep,
unsigned int dir_in,
unsigned int en)
{
unsigned long flags;
u32 bit = 1 << ep;
u32 daint;
if (!dir_in)
bit <<= 16;
local_irq_save(flags);
daint = dwc2_readl(hsotg, DAINTMSK);
if (en)
daint |= bit;
else
daint &= ~bit;
dwc2_writel(hsotg, daint, DAINTMSK);
local_irq_restore(flags);
}
/**
* dwc2_hsotg_tx_fifo_count - return count of TX FIFOs in device mode
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_hsotg_tx_fifo_count(
struct dwc2_hsotg *hsotg)
{
if (hsotg->hw_params.en_multiple_tx_fifo)
/* In dedicated FIFO mode we need count of IN EPs */
return hsotg->hw_params.num_dev_in_eps;
else
/* In shared FIFO mode we need count of Periodic IN EPs */
return hsotg->hw_params.num_dev_perio_in_ep;
}
/**
* dwc2_hsotg_tx_fifo_total_depth - return total FIFO depth available for
* device mode TX FIFOs
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_hsotg_tx_fifo_total_depth(
struct dwc2_hsotg *hsotg)
{
int addr;
int tx_addr_max;
u32 np_tx_fifo_size;
np_tx_fifo_size = min_t(u32, hsotg->hw_params.dev_nperio_tx_fifo_size,
hsotg->params.g_np_tx_fifo_size);
/* Get Endpoint Info Control block size in DWORDs. */
tx_addr_max = hsotg->hw_params.total_fifo_size;
addr = hsotg->params.g_rx_fifo_size + np_tx_fifo_size;
if (tx_addr_max <= addr)
return 0;
return tx_addr_max - addr;
}
/**
* dwc2_gadget_wkup_alert_handler - Handler for WKUP_ALERT interrupt
*
* @hsotg: Programming view of the DWC_otg controller
*
*/
static void dwc2_gadget_wkup_alert_handler(
struct dwc2_hsotg *hsotg)
{
u32 gintsts2;
u32 gintmsk2;
gintsts2 = dwc2_readl(hsotg, GINTSTS2);
gintmsk2 = dwc2_readl(hsotg, GINTMSK2);
gintsts2 &= gintmsk2;
if (gintsts2 & GINTSTS2_WKUP_ALERT_INT) {
dev_dbg(hsotg->dev,
"%s: Wkup_Alert_Int\n", __func__);
dwc2_set_bit(hsotg, GINTSTS2, GINTSTS2_WKUP_ALERT_INT);
dwc2_set_bit(hsotg, DCTL, DCTL_RMTWKUPSIG);
}
}
/**
* dwc2_hsotg_tx_fifo_average_depth - returns average depth of device mode
* TX FIFOs
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_hsotg_tx_fifo_average_depth(
struct dwc2_hsotg *hsotg)
{
int tx_fifo_count;
int tx_fifo_depth;
tx_fifo_depth = dwc2_hsotg_tx_fifo_total_depth(hsotg);
tx_fifo_count = dwc2_hsotg_tx_fifo_count(hsotg);
if (!tx_fifo_count)
return tx_fifo_depth;
else
return tx_fifo_depth / tx_fifo_count;
}
/**
* dwc2_hsotg_init_fifo - initialise non-periodic FIFOs
* @hsotg: The device instance.
*/
static void dwc2_hsotg_init_fifo(
struct dwc2_hsotg *hsotg)
{
unsigned int ep;
unsigned int addr;
int timeout;
u32 val;
u32 *txfsz = hsotg->params.g_tx_fifo_size;
/* Reset fifo map if not correctly cleared during previous session */
WARN_ON(hsotg->fifo_map);
hsotg->fifo_map = 0;
/* set RX/NPTX FIFO sizes */
dwc2_writel(hsotg, hsotg->params.g_rx_fifo_size, GRXFSIZ);
dwc2_writel(hsotg, (hsotg->params.g_rx_fifo_size <<
FIFOSIZE_STARTADDR_SHIFT) |
(hsotg->params.g_np_tx_fifo_size << FIFOSIZE_DEPTH_SHIFT),
GNPTXFSIZ);
/*
* arange all the rest of the TX FIFOs, as some versions of this
* block have overlapping default addresses. This also ensures
* that if the settings have been changed, then they are set to
* known values.
*/
/* start at the end of the GNPTXFSIZ, rounded up */
addr = hsotg->params.g_rx_fifo_size + hsotg->params.g_np_tx_fifo_size;
/*
* Configure fifos sizes from provided configuration and assign
* them to endpoints dynamically according to maxpacket size value of
* given endpoint.
*/
for (ep = 1; ep < MAX_EPS_CHANNELS; ep++) {
if (!txfsz[ep])
continue;
val = addr;
val |= txfsz[ep] << FIFOSIZE_DEPTH_SHIFT;
WARN_ONCE(addr + txfsz[ep] > hsotg->fifo_mem,
"insufficient fifo memory");
addr += txfsz[ep];
dwc2_writel(hsotg, val, DPTXFSIZN(ep));
val = dwc2_readl(hsotg, DPTXFSIZN(ep));
}
dwc2_writel(hsotg, hsotg->hw_params.total_fifo_size |
addr << GDFIFOCFG_EPINFOBASE_SHIFT,
GDFIFOCFG);
/*
* according to p428 of the design guide, we need to ensure that
* all fifos are flushed before continuing
*/
dwc2_writel(hsotg, GRSTCTL_TXFNUM(0x10) | GRSTCTL_TXFFLSH |
GRSTCTL_RXFFLSH, GRSTCTL);
/* wait until the fifos are both flushed */
timeout = 100;
while (1) {
val = dwc2_readl(hsotg, GRSTCTL);
if ((val & (GRSTCTL_TXFFLSH | GRSTCTL_RXFFLSH)) == 0)
break;
if (--timeout == 0) {
dev_err(hsotg->dev,
"%s: timeout flushing fifos (GRSTCTL=%08x)\n",
__func__, val);
break;
}
udelay(1);
}
dev_dbg(hsotg->dev,
"FIFOs reset, timeout at %d\n", timeout);
}
/**
* dwc2_hsotg_ep_alloc_request - allocate USB rerequest structure
* @ep: USB endpoint to allocate request for.
* @flags: Allocation flags
*
* Allocate a new USB request structure appropriate for the specified endpoint
*/
static struct usb_request *dwc2_hsotg_ep_alloc_request(
struct usb_ep *ep,
gfp_t flags)
{
struct dwc2_hsotg_req *req;
req = kzalloc(
sizeof(*req), flags);
if (!req)
return NULL;
INIT_LIST_HEAD(&req->queue);
return &req->req;
}
/**
* is_ep_periodic - return true if the endpoint is in periodic mode.
* @hs_ep: The endpoint to query.
*
* Returns true if the endpoint is in periodic mode, meaning it is being
* used for an Interrupt or ISO transfer.
*/
static inline int is_ep_periodic(
struct dwc2_hsotg_ep *hs_ep)
{
return hs_ep->periodic;
}
/**
* dwc2_hsotg_unmap_dma - unmap the DMA memory being used for the request
* @hsotg: The device state.
* @hs_ep: The endpoint for the request
* @hs_req: The request being processed.
*
* This is the reverse of dwc2_hsotg_map_dma(), called for the completion
* of a request to ensure the buffer is ready for access by the caller.
*/
static void dwc2_hsotg_unmap_dma(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req)
{
struct usb_request *req = &hs_req->req;
usb_gadget_unmap_request(&hsotg->gadget, req, hs_ep->map_dir);
}
/*
* dwc2_gadget_alloc_ctrl_desc_chains - allocate DMA descriptor chains
* for Control endpoint
* @hsotg: The device state.
*
* This function will allocate 4 descriptor chains for EP 0: 2 for
* Setup stage, per one for IN and OUT data/status transactions.
*/
static int dwc2_gadget_alloc_ctrl_desc_chains(
struct dwc2_hsotg *hsotg)
{
hsotg->setup_desc[0] =
dmam_alloc_coherent(hsotg->dev,
sizeof(
struct dwc2_dma_desc),
&hsotg->setup_desc_dma[0],
GFP_KERNEL);
if (!hsotg->setup_desc[0])
goto fail;
hsotg->setup_desc[1] =
dmam_alloc_coherent(hsotg->dev,
sizeof(
struct dwc2_dma_desc),
&hsotg->setup_desc_dma[1],
GFP_KERNEL);
if (!hsotg->setup_desc[1])
goto fail;
hsotg->ctrl_in_desc =
dmam_alloc_coherent(hsotg->dev,
sizeof(
struct dwc2_dma_desc),
&hsotg->ctrl_in_desc_dma,
GFP_KERNEL);
if (!hsotg->ctrl_in_desc)
goto fail;
hsotg->ctrl_out_desc =
dmam_alloc_coherent(hsotg->dev,
sizeof(
struct dwc2_dma_desc),
&hsotg->ctrl_out_desc_dma,
GFP_KERNEL);
if (!hsotg->ctrl_out_desc)
goto fail;
return 0;
fail:
return -ENOMEM;
}
/**
* dwc2_hsotg_write_fifo - write packet Data to the TxFIFO
* @hsotg: The controller state.
* @hs_ep: The endpoint we're going to write for.
* @hs_req: The request to write data for.
*
* This is called when the TxFIFO has some space in it to hold a new
* transmission and we have something to give it. The actual setup of
* the data size is done elsewhere, so all we have to do is to actually
* write the data.
*
* The return value is zero if there is more space (or nothing was done)
* otherwise -ENOSPC is returned if the FIFO space was used up.
*
* This routine is only needed for PIO
*/
static int dwc2_hsotg_write_fifo(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req)
{
bool periodic = is_ep_periodic(hs_ep);
u32 gnptxsts = dwc2_readl(hsotg, GNPTXSTS);
int buf_pos = hs_req->req.actual;
int to_write = hs_ep->size_loaded;
void *data;
int can_write;
int pkt_round;
int max_transfer;
to_write -= (buf_pos - hs_ep->last_load);
/* if there's nothing to write, get out early */
if (to_write == 0)
return 0;
if (periodic && !hsotg->dedicated_fifos) {
u32 epsize = dwc2_readl(hsotg, DIEPTSIZ(hs_ep->index));
int size_left;
int size_done;
/*
* work out how much data was loaded so we can calculate
* how much data is left in the fifo.
*/
size_left = DXEPTSIZ_XFERSIZE_GET(epsize);
/*
* if shared fifo, we cannot write anything until the
* previous data has been completely sent.
*/
if (hs_ep->fifo_load != 0) {
dwc2_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP);
return -ENOSPC;
}
dev_dbg(hsotg->dev,
"%s: left=%d, load=%d, fifo=%d, size %d\n",
__func__, size_left,
hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size);
/* how much of the data has moved */
size_done = hs_ep->size_loaded - size_left;
/* how much data is left in the fifo */
can_write = hs_ep->fifo_load - size_done;
dev_dbg(hsotg->dev,
"%s: => can_write1=%d\n",
__func__, can_write);
can_write = hs_ep->fifo_size - can_write;
dev_dbg(hsotg->dev,
"%s: => can_write2=%d\n",
__func__, can_write);
if (can_write <= 0) {
dwc2_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP);
return -ENOSPC;
}
}
else if (hsotg->dedicated_fifos && hs_ep->index != 0) {
can_write = dwc2_readl(hsotg,
DTXFSTS(hs_ep->fifo_index));
can_write &= 0xffff;
can_write *= 4;
}
else {
if (GNPTXSTS_NP_TXQ_SPC_AVAIL_GET(gnptxsts) == 0) {
dev_dbg(hsotg->dev,
"%s: no queue slots available (0x%08x)\n",
__func__, gnptxsts);
dwc2_hsotg_en_gsint(hsotg, GINTSTS_NPTXFEMP);
return -ENOSPC;
}
can_write = GNPTXSTS_NP_TXF_SPC_AVAIL_GET(gnptxsts);
can_write *= 4;
/* fifo size is in 32bit quantities. */
}
max_transfer = hs_ep->ep.maxpacket * hs_ep->mc;
dev_dbg(hsotg->dev,
"%s: GNPTXSTS=%08x, can=%d, to=%d, max_transfer %d\n",
__func__, gnptxsts, can_write, to_write, max_transfer);
/*
* limit to 512 bytes of data, it seems at least on the non-periodic
* FIFO, requests of >512 cause the endpoint to get stuck with a
* fragment of the end of the transfer in it.
*/
if (can_write > 512 && !periodic)
can_write = 512;
/*
* limit the write to one max-packet size worth of data, but allow
* the transfer to return that it did not run out of fifo space
* doing it.
*/
if (to_write > max_transfer) {
to_write = max_transfer;
/* it's needed only when we do not use dedicated fifos */
if (!hsotg->dedicated_fifos)
dwc2_hsotg_en_gsint(hsotg,
periodic ? GINTSTS_PTXFEMP :
GINTSTS_NPTXFEMP);
}
/* see if we can write data */
if (to_write > can_write) {
to_write = can_write;
pkt_round = to_write % max_transfer;
/*
* Round the write down to an
* exact number of packets.
*
* Note, we do not currently check to see if we can ever
* write a full packet or not to the FIFO.
*/
if (pkt_round)
to_write -= pkt_round;
/*
* enable correct FIFO interrupt to alert us when there
* is more room left.
*/
/* it's needed only when we do not use dedicated fifos */
if (!hsotg->dedicated_fifos)
dwc2_hsotg_en_gsint(hsotg,
periodic ? GINTSTS_PTXFEMP :
GINTSTS_NPTXFEMP);
}
dev_dbg(hsotg->dev,
"write %d/%d, can_write %d, done %d\n",
to_write, hs_req->req.length, can_write, buf_pos);
if (to_write <= 0)
return -ENOSPC;
hs_req->req.actual = buf_pos + to_write;
hs_ep->total_data += to_write;
if (periodic)
hs_ep->fifo_load += to_write;
to_write = DIV_ROUND_UP(to_write, 4);
data = hs_req->req.buf + buf_pos;
dwc2_writel_rep(hsotg, EPFIFO(hs_ep->index), data, to_write);
return (to_write >= can_write) ? -ENOSPC : 0;
}
/**
* get_ep_limit - get the maximum data legnth for this endpoint
* @hs_ep: The endpoint
*
* Return the maximum data that can be queued in one go on a given endpoint
* so that transfers that are too long can be split.
*/
static unsigned int get_ep_limit(
struct dwc2_hsotg_ep *hs_ep)
{
int index = hs_ep->index;
unsigned int maxsize;
unsigned int maxpkt;
if (index != 0) {
maxsize = DXEPTSIZ_XFERSIZE_LIMIT + 1;
maxpkt = DXEPTSIZ_PKTCNT_LIMIT + 1;
}
else {
maxsize = 64 + 64;
if (hs_ep->dir_in)
maxpkt = DIEPTSIZ0_PKTCNT_LIMIT + 1;
else
maxpkt = 2;
}
/* we made the constant loading easier above by using +1 */
maxpkt--;
maxsize--;
/*
* constrain by packet count if maxpkts*pktsize is greater
* than the length register size.
*/
if ((maxpkt * hs_ep->ep.maxpacket) < maxsize)
maxsize = maxpkt * hs_ep->ep.maxpacket;
return maxsize;
}
/**
* dwc2_hsotg_read_frameno - read current frame number
* @hsotg: The device instance
*
* Return the current frame number
*/
static u32 dwc2_hsotg_read_frameno(
struct dwc2_hsotg *hsotg)
{
u32 dsts;
dsts = dwc2_readl(hsotg, DSTS);
dsts &= DSTS_SOFFN_MASK;
dsts >>= DSTS_SOFFN_SHIFT;
return dsts;
}
/**
* dwc2_gadget_get_chain_limit - get the maximum data payload value of the
* DMA descriptor chain prepared for specific endpoint
* @hs_ep: The endpoint
*
* Return the maximum data that can be queued in one go on a given endpoint
* depending on its descriptor chain capacity so that transfers that
* are too long can be split.
*/
static unsigned int dwc2_gadget_get_chain_limit(
struct dwc2_hsotg_ep *hs_ep)
{
const struct usb_endpoint_descriptor *ep_desc = hs_ep->ep.desc;
int is_isoc = hs_ep->isochronous;
unsigned int maxsize;
u32 mps = hs_ep->ep.maxpacket;
int dir_in = hs_ep->dir_in;
if (is_isoc)
maxsize = (hs_ep->dir_in ? DEV_DMA_ISOC_TX_NBYTES_LIMIT :
DEV_DMA_ISOC_RX_NBYTES_LIMIT) *
MAX_DMA_DESC_NUM_HS_ISOC;
else
maxsize = DEV_DMA_NBYTES_LIMIT * MAX_DMA_DESC_NUM_GENERIC;
/* Interrupt OUT EP with mps not multiple of 4 */
if (hs_ep->index)
if (usb_endpoint_xfer_int(ep_desc) && !dir_in && (mps % 4))
maxsize = mps * MAX_DMA_DESC_NUM_GENERIC;
return maxsize;
}
/*
* dwc2_gadget_get_desc_params - get DMA descriptor parameters.
* @hs_ep: The endpoint
* @mask: RX/TX bytes mask to be defined
*
* Returns maximum data payload for one descriptor after analyzing endpoint
* characteristics.
* DMA descriptor transfer bytes limit depends on EP type:
* Control out - MPS,
* Isochronous - descriptor rx/tx bytes bitfield limit,
* Control In/Bulk/Interrupt - multiple of mps. This will allow to not
* have concatenations from various descriptors within one packet.
* Interrupt OUT - if mps not multiple of 4 then a single packet corresponds
* to a single descriptor.
*
* Selects corresponding mask for RX/TX bytes as well.
*/
static u32 dwc2_gadget_get_desc_params(
struct dwc2_hsotg_ep *hs_ep, u32 *mask)
{
const struct usb_endpoint_descriptor *ep_desc = hs_ep->ep.desc;
u32 mps = hs_ep->ep.maxpacket;
int dir_in = hs_ep->dir_in;
u32 desc_size = 0;
if (!hs_ep->index && !dir_in) {
desc_size = mps;
*mask = DEV_DMA_NBYTES_MASK;
}
else if (hs_ep->isochronous) {
if (dir_in) {
desc_size = DEV_DMA_ISOC_TX_NBYTES_LIMIT;
*mask = DEV_DMA_ISOC_TX_NBYTES_MASK;
}
else {
desc_size = DEV_DMA_ISOC_RX_NBYTES_LIMIT;
*mask = DEV_DMA_ISOC_RX_NBYTES_MASK;
}
}
else {
desc_size = DEV_DMA_NBYTES_LIMIT;
*mask = DEV_DMA_NBYTES_MASK;
/* Round down desc_size to be mps multiple */
desc_size -= desc_size % mps;
}
/* Interrupt OUT EP with mps not multiple of 4 */
if (hs_ep->index)
if (usb_endpoint_xfer_int(ep_desc) && !dir_in && (mps % 4)) {
desc_size = mps;
*mask = DEV_DMA_NBYTES_MASK;
}
return desc_size;
}
static void dwc2_gadget_fill_nonisoc_xfer_ddma_one(
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_dma_desc **desc,
dma_addr_t dma_buff,
unsigned int len,
bool true_last)
{
int dir_in = hs_ep->dir_in;
u32 mps = hs_ep->ep.maxpacket;
u32 maxsize = 0;
u32 offset = 0;
u32 mask = 0;
int i;
maxsize = dwc2_gadget_get_desc_params(hs_ep, &mask);
hs_ep->desc_count = (len / maxsize) +
((len % maxsize) ? 1 : 0);
if (len == 0)
hs_ep->desc_count = 1;
for (i = 0; i < hs_ep->desc_count; ++i) {
(*desc)->status = 0;
(*desc)->status |= (DEV_DMA_BUFF_STS_HBUSY
<< DEV_DMA_BUFF_STS_SHIFT);
if (len > maxsize) {
if (!hs_ep->index && !dir_in)
(*desc)->status |= (DEV_DMA_L | DEV_DMA_IOC);
(*desc)->status |=
maxsize << DEV_DMA_NBYTES_SHIFT & mask;
(*desc)->buf = dma_buff + offset;
len -= maxsize;
offset += maxsize;
}
else {
if (true_last)
(*desc)->status |= (DEV_DMA_L | DEV_DMA_IOC);
if (dir_in)
(*desc)->status |= (len % mps) ? DEV_DMA_SHORT :
((hs_ep->send_zlp && true_last) ?
DEV_DMA_SHORT : 0);
(*desc)->status |=
len << DEV_DMA_NBYTES_SHIFT & mask;
(*desc)->buf = dma_buff + offset;
}
(*desc)->status &= ~DEV_DMA_BUFF_STS_MASK;
(*desc)->status |= (DEV_DMA_BUFF_STS_HREADY
<< DEV_DMA_BUFF_STS_SHIFT);
(*desc)++;
}
}
/*
* dwc2_gadget_config_nonisoc_xfer_ddma - prepare non ISOC DMA desc chain.
* @hs_ep: The endpoint
* @ureq: Request to transfer
* @offset: offset in bytes
* @len: Length of the transfer
*
* This function will iterate over descriptor chain and fill its entries
* with corresponding information based on transfer data.
*/
static void dwc2_gadget_config_nonisoc_xfer_ddma(
struct dwc2_hsotg_ep *hs_ep,
dma_addr_t dma_buff,
unsigned int len)
{
struct usb_request *ureq = NULL;
struct dwc2_dma_desc *desc = hs_ep->desc_list;
struct scatterlist *sg;
int i;
u8 desc_count = 0;
if (hs_ep->req)
ureq = &hs_ep->req->req;
/* non-DMA sg buffer */
if (!ureq || !ureq->num_sgs) {
dwc2_gadget_fill_nonisoc_xfer_ddma_one(hs_ep, &desc,
dma_buff, len,
true);
return;
}
/* DMA sg buffer */
for_each_sg(ureq->sg, sg, ureq->num_mapped_sgs, i) {
dwc2_gadget_fill_nonisoc_xfer_ddma_one(hs_ep, &desc,
sg_dma_address(sg) + sg->offset, sg_dma_len(sg),
(i == (ureq->num_mapped_sgs - 1)));
desc_count += hs_ep->desc_count;
}
hs_ep->desc_count = desc_count;
}
/*
* dwc2_gadget_fill_isoc_desc - fills next isochronous descriptor in chain.
* @hs_ep: The isochronous endpoint.
* @dma_buff: usb requests dma buffer.
* @len: usb request transfer length.
*
* Fills next free descriptor with the data of the arrived usb request,
* frame info, sets Last and IOC bits increments next_desc. If filled
* descriptor is not the first one, removes L bit from the previous descriptor
* status.
*/
static int dwc2_gadget_fill_isoc_desc(
struct dwc2_hsotg_ep *hs_ep,
dma_addr_t dma_buff,
unsigned int len)
{
struct dwc2_dma_desc *desc;
struct dwc2_hsotg *hsotg = hs_ep->parent;
u32 index;
u32 mask = 0;
u8 pid = 0;
dwc2_gadget_get_desc_params(hs_ep, &mask);
index = hs_ep->next_desc;
desc = &hs_ep->desc_list[index];
/* Check if descriptor chain full */
if ((desc->status >> DEV_DMA_BUFF_STS_SHIFT) ==
DEV_DMA_BUFF_STS_HREADY) {
dev_dbg(hsotg->dev,
"%s: desc chain full\n", __func__);
return 1;
}
/* Clear L bit of previous desc if more than one entries in the chain */
if (hs_ep->next_desc)
hs_ep->desc_list[index - 1].status &= ~DEV_DMA_L;
dev_dbg(hsotg->dev,
"%s: Filling ep %d, dir %s isoc desc # %d\n",
__func__, hs_ep->index, hs_ep->dir_in ?
"in" :
"out", index);
desc->status = 0;
desc->status |= (DEV_DMA_BUFF_STS_HBUSY << DEV_DMA_BUFF_STS_SHIFT);
desc->buf = dma_buff;
desc->status |= (DEV_DMA_L | DEV_DMA_IOC |
((len << DEV_DMA_NBYTES_SHIFT) & mask));
if (hs_ep->dir_in) {
if (len)
pid = DIV_ROUND_UP(len, hs_ep->ep.maxpacket);
else
pid = 1;
desc->status |= ((pid << DEV_DMA_ISOC_PID_SHIFT) &
DEV_DMA_ISOC_PID_MASK) |
((len % hs_ep->ep.maxpacket) ?
DEV_DMA_SHORT : 0) |
((hs_ep->target_frame <<
DEV_DMA_ISOC_FRNUM_SHIFT) &
DEV_DMA_ISOC_FRNUM_MASK);
}
desc->status &= ~DEV_DMA_BUFF_STS_MASK;
desc->status |= (DEV_DMA_BUFF_STS_HREADY << DEV_DMA_BUFF_STS_SHIFT);
/* Increment frame number by interval for IN */
if (hs_ep->dir_in)
dwc2_gadget_incr_frame_num(hs_ep);
/* Update index of last configured entry in the chain */
hs_ep->next_desc++;
if (hs_ep->next_desc >= MAX_DMA_DESC_NUM_HS_ISOC)
hs_ep->next_desc = 0;
return 0;
}
/*
* dwc2_gadget_start_isoc_ddma - start isochronous transfer in DDMA
* @hs_ep: The isochronous endpoint.
*
* Prepare descriptor chain for isochronous endpoints. Afterwards
* write DMA address to HW and enable the endpoint.
*/
static void dwc2_gadget_start_isoc_ddma(
struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
struct dwc2_hsotg_req *hs_req, *treq;
int index = hs_ep->index;
int ret;
int i;
u32 dma_reg;
u32 depctl;
u32 ctrl;
struct dwc2_dma_desc *desc;
if (list_empty(&hs_ep->queue)) {
hs_ep->target_frame = TARGET_FRAME_INITIAL;
dev_dbg(hsotg->dev,
"%s: No requests in queue\n", __func__);
return;
}
/* Initialize descriptor chain by Host Busy status */
for (i = 0; i < MAX_DMA_DESC_NUM_HS_ISOC; i++) {
desc = &hs_ep->desc_list[i];
desc->status = 0;
desc->status |= (DEV_DMA_BUFF_STS_HBUSY
<< DEV_DMA_BUFF_STS_SHIFT);
}
hs_ep->next_desc = 0;
list_for_each_entry_safe(hs_req, treq, &hs_ep->queue, queue) {
dma_addr_t dma_addr = hs_req->req.dma;
if (hs_req->req.num_sgs) {
WARN_ON(hs_req->req.num_sgs > 1);
dma_addr = sg_dma_address(hs_req->req.sg);
}
ret = dwc2_gadget_fill_isoc_desc(hs_ep, dma_addr,
hs_req->req.length);
if (ret)
break;
}
hs_ep->compl_desc = 0;
depctl = hs_ep->dir_in ? DIEPCTL(index) : DOEPCTL(index);
dma_reg = hs_ep->dir_in ? DIEPDMA(index) : DOEPDMA(index);
/* write descriptor chain address to control register */
dwc2_writel(hsotg, hs_ep->desc_list_dma, dma_reg);
ctrl = dwc2_readl(hsotg, depctl);
ctrl |= DXEPCTL_EPENA | DXEPCTL_CNAK;
dwc2_writel(hsotg, ctrl, depctl);
}
static bool dwc2_gadget_target_frame_elapsed(
struct dwc2_hsotg_ep *hs_ep);
static void dwc2_hsotg_complete_request(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req,
int result);
/**
* dwc2_hsotg_start_req - start a USB request from an endpoint's queue
* @hsotg: The controller state.
* @hs_ep: The endpoint to process a request for
* @hs_req: The request to start.
* @continuing: True if we are doing more for the current request.
*
* Start the given request running by setting the endpoint registers
* appropriately, and writing any data to the FIFOs.
*/
static void dwc2_hsotg_start_req(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req,
bool continuing)
{
struct usb_request *ureq = &hs_req->req;
int index = hs_ep->index;
int dir_in = hs_ep->dir_in;
u32 epctrl_reg;
u32 epsize_reg;
u32 epsize;
u32 ctrl;
unsigned int length;
unsigned int packets;
unsigned int maxreq;
unsigned int dma_reg;
if (index != 0) {
if (hs_ep->req && !continuing) {
dev_err(hsotg->dev,
"%s: active request\n", __func__);
WARN_ON(1);
return;
}
else if (hs_ep->req != hs_req && continuing) {
dev_err(hsotg->dev,
"%s: continue different req\n", __func__);
WARN_ON(1);
return;
}
}
dma_reg = dir_in ? DIEPDMA(index) : DOEPDMA(index);
epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
epsize_reg = dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index);
dev_dbg(hsotg->dev,
"%s: DxEPCTL=0x%08x, ep %d, dir %s\n",
__func__, dwc2_readl(hsotg, epctrl_reg), index,
hs_ep->dir_in ?
"in" :
"out");
/* If endpoint is stalled, we will restart request later */
ctrl = dwc2_readl(hsotg, epctrl_reg);
if (index && ctrl & DXEPCTL_STALL) {
dev_warn(hsotg->dev,
"%s: ep%d is stalled\n", __func__, index);
return;
}
length = ureq->length - ureq->actual;
dev_dbg(hsotg->dev,
"ureq->length:%d ureq->actual:%d\n",
ureq->length, ureq->actual);
if (!using_desc_dma(hsotg))
maxreq = get_ep_limit(hs_ep);
else
maxreq = dwc2_gadget_get_chain_limit(hs_ep);
if (length > maxreq) {
int round = maxreq % hs_ep->ep.maxpacket;
dev_dbg(hsotg->dev,
"%s: length %d, max-req %d, r %d\n",
__func__, length, maxreq, round);
/* round down to multiple of packets */
if (round)
maxreq -= round;
length = maxreq;
}
if (length)
packets = DIV_ROUND_UP(length, hs_ep->ep.maxpacket);
else
packets = 1;
/* send one packet if length is zero. */
if (dir_in && index != 0)
if (hs_ep->isochronous)
epsize = DXEPTSIZ_MC(packets);
else
epsize = DXEPTSIZ_MC(1);
else
epsize = 0;
/*
* zero length packet should be programmed on its own and should not
* be counted in DIEPTSIZ.PktCnt with other packets.
*/
if (dir_in && ureq->zero && !continuing) {
/* Test if zlp is actually required. */
if ((ureq->length >= hs_ep->ep.maxpacket) &&
!(ureq->length % hs_ep->ep.maxpacket))
hs_ep->send_zlp = 1;
}
epsize |= DXEPTSIZ_PKTCNT(packets);
epsize |= DXEPTSIZ_XFERSIZE(length);
dev_dbg(hsotg->dev,
"%s: %d@%d/%d, 0x%08x => 0x%08x\n",
__func__, packets, length, ureq->length, epsize, epsize_reg);
/* store the request as the current one we're doing */
hs_ep->req = hs_req;
if (using_desc_dma(hsotg)) {
u32 offset = 0;
u32 mps = hs_ep->ep.maxpacket;
/* Adjust length: EP0 - MPS, other OUT EPs - multiple of MPS */
if (!dir_in) {
if (!index)
length = mps;
else if (length % mps)
length += (mps - (length % mps));
}
if (continuing)
offset = ureq->actual;
/* Fill DDMA chain entries */
dwc2_gadget_config_nonisoc_xfer_ddma(hs_ep, ureq->dma + offset,
length);
/* write descriptor chain address to control register */
dwc2_writel(hsotg, hs_ep->desc_list_dma, dma_reg);
dev_dbg(hsotg->dev,
"%s: %08x pad => 0x%08x\n",
__func__, (u32)hs_ep->desc_list_dma, dma_reg);
}
else {
/* write size / packets */
dwc2_writel(hsotg, epsize, epsize_reg);
if (using_dma(hsotg) && !continuing && (length != 0)) {
/*
* write DMA address to control register, buffer
* already synced by dwc2_hsotg_ep_queue().
*/
dwc2_writel(hsotg, ureq->dma, dma_reg);
dev_dbg(hsotg->dev,
"%s: %pad => 0x%08x\n",
__func__, &ureq->dma, dma_reg);
}
}
if (hs_ep->isochronous) {
if (!dwc2_gadget_target_frame_elapsed(hs_ep)) {
if (hs_ep->interval == 1) {
if (hs_ep->target_frame & 0x1)
ctrl |= DXEPCTL_SETODDFR;
else
ctrl |= DXEPCTL_SETEVENFR;
}
ctrl |= DXEPCTL_CNAK;
}
else {
hs_req->req.frame_number = hs_ep->target_frame;
hs_req->req.actual = 0;
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, -ENODATA);
return;
}
}
ctrl |= DXEPCTL_EPENA;
/* ensure ep enabled */
dev_dbg(hsotg->dev,
"ep0 state:%d\n", hsotg->ep0_state);
/* For Setup request do not clear NAK */
if (!(index == 0 && hsotg->ep0_state == DWC2_EP0_SETUP))
ctrl |= DXEPCTL_CNAK;
/* clear NAK set by core */
dev_dbg(hsotg->dev,
"%s: DxEPCTL=0x%08x\n", __func__, ctrl);
dwc2_writel(hsotg, ctrl, epctrl_reg);
/*
* set these, it seems that DMA support increments past the end
* of the packet buffer so we need to calculate the length from
* this information.
*/
hs_ep->size_loaded = length;
hs_ep->last_load = ureq->actual;
if (dir_in && !using_dma(hsotg)) {
/* set these anyway, we may need them for non-periodic in */
hs_ep->fifo_load = 0;
dwc2_hsotg_write_fifo(hsotg, hs_ep, hs_req);
}
/*
* Note, trying to clear the NAK here causes problems with transmit
* on the S3C6400 ending up with the TXFIFO becoming full.
*/
/* check ep is enabled */
if (!(dwc2_readl(hsotg, epctrl_reg) & DXEPCTL_EPENA))
dev_dbg(hsotg->dev,
"ep%d: failed to become enabled (DXEPCTL=0x%08x)?\n",
index, dwc2_readl(hsotg, epctrl_reg));
dev_dbg(hsotg->dev,
"%s: DXEPCTL=0x%08x\n",
__func__, dwc2_readl(hsotg, epctrl_reg));
/* enable ep interrupts */
dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 1);
}
/**
* dwc2_hsotg_map_dma - map the DMA memory being used for the request
* @hsotg: The device state.
* @hs_ep: The endpoint the request is on.
* @req: The request being processed.
*
* We've been asked to queue a request, so ensure that the memory buffer
* is correctly setup for DMA. If we've been passed an extant DMA address
* then ensure the buffer has been synced to memory. If our buffer has no
* DMA memory, then we map the memory and mark our request to allow us to
* cleanup on completion.
*/
static int dwc2_hsotg_map_dma(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct usb_request *req)
{
int ret;
hs_ep->map_dir = hs_ep->dir_in;
ret = usb_gadget_map_request(&hsotg->gadget, req, hs_ep->dir_in);
if (ret)
goto dma_error;
return 0;
dma_error:
dev_err(hsotg->dev,
"%s: failed to map buffer %p, %d bytes\n",
__func__, req->buf, req->length);
return -EIO;
}
static int dwc2_hsotg_handle_unaligned_buf_start(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req)
{
void *req_buf = hs_req->req.buf;
/* If dma is not being used or buffer is aligned */
if (!using_dma(hsotg) || !((
long)req_buf & 3))
return 0;
WARN_ON(hs_req->saved_req_buf);
dev_dbg(hsotg->dev,
"%s: %s: buf=%p length=%d\n", __func__,
hs_ep->ep.name, req_buf, hs_req->req.length);
hs_req->req.buf = kmalloc(hs_req->req.length, GFP_ATOMIC);
if (!hs_req->req.buf) {
hs_req->req.buf = req_buf;
dev_err(hsotg->dev,
"%s: unable to allocate memory for bounce buffer\n",
__func__);
return -ENOMEM;
}
/* Save actual buffer */
hs_req->saved_req_buf = req_buf;
if (hs_ep->dir_in)
memcpy(hs_req->req.buf, req_buf, hs_req->req.length);
return 0;
}
static void
dwc2_hsotg_handle_unaligned_buf_complete(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req)
{
/* If dma is not being used or buffer was aligned */
if (!using_dma(hsotg) || !hs_req->saved_req_buf)
return;
dev_dbg(hsotg->dev,
"%s: %s: status=%d actual-length=%d\n", __func__,
hs_ep->ep.name, hs_req->req.status, hs_req->req.actual);
/* Copy data from bounce buffer on successful out transfer */
if (!hs_ep->dir_in && !hs_req->req.status)
memcpy(hs_req->saved_req_buf, hs_req->req.buf,
hs_req->req.actual);
/* Free bounce buffer */
kfree(hs_req->req.buf);
hs_req->req.buf = hs_req->saved_req_buf;
hs_req->saved_req_buf = NULL;
}
/**
* dwc2_gadget_target_frame_elapsed - Checks target frame
* @hs_ep: The driver endpoint to check
*
* Returns 1 if targeted frame elapsed. If returned 1 then we need to drop
* corresponding transfer.
*/
static bool dwc2_gadget_target_frame_elapsed(
struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
u32 target_frame = hs_ep->target_frame;
u32 current_frame = hsotg->frame_number;
bool frame_overrun = hs_ep->frame_overrun;
u16 limit = DSTS_SOFFN_LIMIT;
if (hsotg->gadget.speed != USB_SPEED_HIGH)
limit >>= 3;
if (!frame_overrun && current_frame >= target_frame)
return true;
if (frame_overrun && current_frame >= target_frame &&
((current_frame - target_frame) < limit / 2))
return true;
return false;
}
/*
* dwc2_gadget_set_ep0_desc_chain - Set EP's desc chain pointers
* @hsotg: The driver state
* @hs_ep: the ep descriptor chain is for
*
* Called to update EP0 structure's pointers depend on stage of
* control transfer.
*/
static int dwc2_gadget_set_ep0_desc_chain(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep)
{
switch (hsotg->ep0_state) {
case DWC2_EP0_SETUP:
case DWC2_EP0_STATUS_OUT:
hs_ep->desc_list = hsotg->setup_desc[0];
hs_ep->desc_list_dma = hsotg->setup_desc_dma[0];
break;
case DWC2_EP0_DATA_IN:
case DWC2_EP0_STATUS_IN:
hs_ep->desc_list = hsotg->ctrl_in_desc;
hs_ep->desc_list_dma = hsotg->ctrl_in_desc_dma;
break;
case DWC2_EP0_DATA_OUT:
hs_ep->desc_list = hsotg->ctrl_out_desc;
hs_ep->desc_list_dma = hsotg->ctrl_out_desc_dma;
break;
default:
dev_err(hsotg->dev,
"invalid EP 0 state in queue %d\n",
hsotg->ep0_state);
return -EINVAL;
}
return 0;
}
static int dwc2_hsotg_ep_queue(
struct usb_ep *ep,
struct usb_request *req,
gfp_t gfp_flags)
{
struct dwc2_hsotg_req *hs_req = our_req(req);
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hs = hs_ep->parent;
bool first;
int ret;
u32 maxsize = 0;
u32 mask = 0;
dev_dbg(hs->dev,
"%s: req %p: %d@%p, noi=%d, zero=%d, snok=%d\n",
ep->name, req, req->length, req->buf, req->no_interrupt,
req->zero, req->short_not_ok);
if (hs->lx_state == DWC2_L1) {
dwc2_wakeup_from_lpm_l1(hs,
true);
}
/* Prevent new request submission when controller is suspended */
if (hs->lx_state != DWC2_L0) {
dev_dbg(hs->dev,
"%s: submit request only in active state\n",
__func__);
return -EAGAIN;
}
/* initialise status of the request */
INIT_LIST_HEAD(&hs_req->queue);
req->actual = 0;
req->status = -EINPROGRESS;
/* Don't queue ISOC request if length greater than mps*mc */
if (hs_ep->isochronous &&
req->length > (hs_ep->mc * hs_ep->ep.maxpacket)) {
dev_err(hs->dev,
"req length > maxpacket*mc\n");
return -EINVAL;
}
/* In DDMA mode for ISOC's don't queue request if length greater
* than descriptor limits.
*/
if (using_desc_dma(hs) && hs_ep->isochronous) {
maxsize = dwc2_gadget_get_desc_params(hs_ep, &mask);
if (hs_ep->dir_in && req->length > maxsize) {
dev_err(hs->dev,
"wrong length %d (maxsize=%d)\n",
req->length, maxsize);
return -EINVAL;
}
if (!hs_ep->dir_in && req->length > hs_ep->ep.maxpacket) {
dev_err(hs->dev,
"ISOC OUT: wrong length %d (mps=%d)\n",
req->length, hs_ep->ep.maxpacket);
return -EINVAL;
}
}
ret = dwc2_hsotg_handle_unaligned_buf_start(hs, hs_ep, hs_req);
if (ret)
return ret;
/* if we're using DMA, sync the buffers as necessary */
if (using_dma(hs)) {
ret = dwc2_hsotg_map_dma(hs, hs_ep, req);
if (ret)
return ret;
}
/* If using descriptor DMA configure EP0 descriptor chain pointers */
if (using_desc_dma(hs) && !hs_ep->index) {
ret = dwc2_gadget_set_ep0_desc_chain(hs, hs_ep);
if (ret)
return ret;
}
first = list_empty(&hs_ep->queue);
list_add_tail(&hs_req->queue, &hs_ep->queue);
/*
* Handle DDMA isochronous transfers separately - just add new entry
* to the descriptor chain.
* Transfer will be started once SW gets either one of NAK or
* OutTknEpDis interrupts.
*/
if (using_desc_dma(hs) && hs_ep->isochronous) {
if (hs_ep->target_frame != TARGET_FRAME_INITIAL) {
dma_addr_t dma_addr = hs_req->req.dma;
if (hs_req->req.num_sgs) {
WARN_ON(hs_req->req.num_sgs > 1);
dma_addr = sg_dma_address(hs_req->req.sg);
}
dwc2_gadget_fill_isoc_desc(hs_ep, dma_addr,
hs_req->req.length);
}
return 0;
}
/* Change EP direction if status phase request is after data out */
if (!hs_ep->index && !req->length && !hs_ep->dir_in &&
hs->ep0_state == DWC2_EP0_DATA_OUT)
hs_ep->dir_in = 1;
if (first) {
if (!hs_ep->isochronous) {
dwc2_hsotg_start_req(hs, hs_ep, hs_req,
false);
return 0;
}
/* Update current frame number value. */
hs->frame_number = dwc2_hsotg_read_frameno(hs);
while (dwc2_gadget_target_frame_elapsed(hs_ep)) {
dwc2_gadget_incr_frame_num(hs_ep);
/* Update current frame number value once more as it
* changes here.
*/
hs->frame_number = dwc2_hsotg_read_frameno(hs);
}
if (hs_ep->target_frame != TARGET_FRAME_INITIAL)
dwc2_hsotg_start_req(hs, hs_ep, hs_req,
false);
}
return 0;
}
static int dwc2_hsotg_ep_queue_lock(
struct usb_ep *ep,
struct usb_request *req,
gfp_t gfp_flags)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hs = hs_ep->parent;
unsigned long flags;
int ret;
spin_lock_irqsave(&hs->lock, flags);
ret = dwc2_hsotg_ep_queue(ep, req, gfp_flags);
spin_unlock_irqrestore(&hs->lock, flags);
return ret;
}
static void dwc2_hsotg_ep_free_request(
struct usb_ep *ep,
struct usb_request *req)
{
struct dwc2_hsotg_req *hs_req = our_req(req);
kfree(hs_req);
}
/**
* dwc2_hsotg_complete_oursetup - setup completion callback
* @ep: The endpoint the request was on.
* @req: The request completed.
*
* Called on completion of any requests the driver itself
* submitted that need cleaning up.
*/
static void dwc2_hsotg_complete_oursetup(
struct usb_ep *ep,
struct usb_request *req)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hsotg = hs_ep->parent;
dev_dbg(hsotg->dev,
"%s: ep %p, req %p\n", __func__, ep, req);
dwc2_hsotg_ep_free_request(ep, req);
}
/**
* ep_from_windex - convert control wIndex value to endpoint
* @hsotg: The driver state.
* @windex: The control request wIndex field (in host order).
*
* Convert the given wIndex into a pointer to an driver endpoint
* structure, or return NULL if it is not a valid endpoint.
*/
static struct dwc2_hsotg_ep *ep_from_windex(
struct dwc2_hsotg *hsotg,
u32 windex)
{
int dir = (windex & USB_DIR_IN) ? 1 : 0;
int idx = windex & 0x7F;
if (windex >= 0x100)
return NULL;
if (idx > hsotg->num_of_eps)
return NULL;
return index_to_ep(hsotg, idx, dir);
}
/**
* dwc2_hsotg_set_test_mode - Enable usb Test Modes
* @hsotg: The driver state.
* @testmode: requested usb test mode
* Enable usb Test Mode requested by the Host.
*/
int dwc2_hsotg_set_test_mode(
struct dwc2_hsotg *hsotg,
int testmode)
{
int dctl = dwc2_readl(hsotg, DCTL);
dctl &= ~DCTL_TSTCTL_MASK;
switch (testmode) {
case USB_TEST_J:
case USB_TEST_K:
case USB_TEST_SE0_NAK:
case USB_TEST_PACKET:
case USB_TEST_FORCE_ENABLE:
dctl |= testmode << DCTL_TSTCTL_SHIFT;
break;
default:
return -EINVAL;
}
dwc2_writel(hsotg, dctl, DCTL);
return 0;
}
/**
* dwc2_hsotg_send_reply - send reply to control request
* @hsotg: The device state
* @ep: Endpoint 0
* @buff: Buffer for request
* @length: Length of reply.
*
* Create a request and queue it on the given endpoint. This is useful as
* an internal method of sending replies to certain control requests, etc.
*/
static int dwc2_hsotg_send_reply(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *ep,
void *buff,
int length)
{
struct usb_request *req;
int ret;
dev_dbg(hsotg->dev,
"%s: buff %p, len %d\n", __func__, buff, length);
req = dwc2_hsotg_ep_alloc_request(&ep->ep, GFP_ATOMIC);
hsotg->ep0_reply = req;
if (!req) {
dev_warn(hsotg->dev,
"%s: cannot alloc req\n", __func__);
return -ENOMEM;
}
req->buf = hsotg->ep0_buff;
req->length = length;
/*
* zero flag is for sending zlp in DATA IN stage. It has no impact on
* STATUS stage.
*/
req->zero = 0;
req->complete = dwc2_hsotg_complete_oursetup;
if (length)
memcpy(req->buf, buff, length);
ret = dwc2_hsotg_ep_queue(&ep->ep, req, GFP_ATOMIC);
if (ret) {
dev_warn(hsotg->dev,
"%s: cannot queue req\n", __func__);
return ret;
}
return 0;
}
/**
* dwc2_hsotg_process_req_status - process request GET_STATUS
* @hsotg: The device state
* @ctrl: USB control request
*/
static int dwc2_hsotg_process_req_status(
struct dwc2_hsotg *hsotg,
struct usb_ctrlrequest *ctrl)
{
struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
struct dwc2_hsotg_ep *ep;
__le16 reply;
u16 status;
int ret;
dev_dbg(hsotg->dev,
"%s: USB_REQ_GET_STATUS\n", __func__);
if (!ep0->dir_in) {
dev_warn(hsotg->dev,
"%s: direction out?\n", __func__);
return -EINVAL;
}
switch (ctrl->bRequestType & USB_RECIP_MASK) {
case USB_RECIP_DEVICE:
status = hsotg->gadget.is_selfpowered <<
USB_DEVICE_SELF_POWERED;
status |= hsotg->remote_wakeup_allowed <<
USB_DEVICE_REMOTE_WAKEUP;
reply = cpu_to_le16(status);
break;
case USB_RECIP_INTERFACE:
/* currently, the data result should be zero */
reply = cpu_to_le16(0);
break;
case USB_RECIP_ENDPOINT:
ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex));
if (!ep)
return -ENOENT;
reply = cpu_to_le16(ep->halted ? 1 : 0);
break;
default:
return 0;
}
if (le16_to_cpu(ctrl->wLength) != 2)
return -EINVAL;
ret = dwc2_hsotg_send_reply(hsotg, ep0, &reply, 2);
if (ret) {
dev_err(hsotg->dev,
"%s: failed to send reply\n", __func__);
return ret;
}
return 1;
}
static int dwc2_hsotg_ep_sethalt(
struct usb_ep *ep,
int value,
bool now);
/**
* get_ep_head - return the first request on the endpoint
* @hs_ep: The controller endpoint to get
*
* Get the first request on the endpoint.
*/
static struct dwc2_hsotg_req *get_ep_head(
struct dwc2_hsotg_ep *hs_ep)
{
return list_first_entry_or_null(&hs_ep->queue,
struct dwc2_hsotg_req,
queue);
}
/**
* dwc2_gadget_start_next_request - Starts next request from ep queue
* @hs_ep: Endpoint structure
*
* If queue is empty and EP is ISOC-OUT - unmasks OUTTKNEPDIS which is masked
* in its handler. Hence we need to unmask it here to be able to do
* resynchronization.
*/
static void dwc2_gadget_start_next_request(
struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
int dir_in = hs_ep->dir_in;
struct dwc2_hsotg_req *hs_req;
if (!list_empty(&hs_ep->queue)) {
hs_req = get_ep_head(hs_ep);
dwc2_hsotg_start_req(hsotg, hs_ep, hs_req,
false);
return;
}
if (!hs_ep->isochronous)
return;
if (dir_in) {
dev_dbg(hsotg->dev,
"%s: No more ISOC-IN requests\n",
__func__);
}
else {
dev_dbg(hsotg->dev,
"%s: No more ISOC-OUT requests\n",
__func__);
}
}
/**
* dwc2_hsotg_process_req_feature - process request {SET,CLEAR}_FEATURE
* @hsotg: The device state
* @ctrl: USB control request
*/
static int dwc2_hsotg_process_req_feature(
struct dwc2_hsotg *hsotg,
struct usb_ctrlrequest *ctrl)
{
struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
struct dwc2_hsotg_req *hs_req;
bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
struct dwc2_hsotg_ep *ep;
int ret;
bool halted;
u32 recip;
u32 wValue;
u32 wIndex;
dev_dbg(hsotg->dev,
"%s: %s_FEATURE\n",
__func__, set ?
"SET" :
"CLEAR");
wValue = le16_to_cpu(ctrl->wValue);
wIndex = le16_to_cpu(ctrl->wIndex);
recip = ctrl->bRequestType & USB_RECIP_MASK;
switch (recip) {
case USB_RECIP_DEVICE:
switch (wValue) {
case USB_DEVICE_REMOTE_WAKEUP:
if (set)
hsotg->remote_wakeup_allowed = 1;
else
hsotg->remote_wakeup_allowed = 0;
break;
case USB_DEVICE_TEST_MODE:
if ((wIndex & 0xff) != 0)
return -EINVAL;
if (!set)
return -EINVAL;
hsotg->test_mode = wIndex >> 8;
break;
default:
return -ENOENT;
}
ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
if (ret) {
dev_err(hsotg->dev,
"%s: failed to send reply\n", __func__);
return ret;
}
break;
case USB_RECIP_ENDPOINT:
ep = ep_from_windex(hsotg, wIndex);
if (!ep) {
dev_dbg(hsotg->dev,
"%s: no endpoint for 0x%04x\n",
__func__, wIndex);
return -ENOENT;
}
switch (wValue) {
case USB_ENDPOINT_HALT:
halted = ep->halted;
if (!ep->wedged)
dwc2_hsotg_ep_sethalt(&ep->ep, set,
true);
ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
if (ret) {
dev_err(hsotg->dev,
"%s: failed to send reply\n", __func__);
return ret;
}
/*
* we have to complete all requests for ep if it was
* halted, and the halt was cleared by CLEAR_FEATURE
*/
if (!set && halted) {
/*
* If we have request in progress,
* then complete it
*/
if (ep->req) {
hs_req = ep->req;
ep->req = NULL;
list_del_init(&hs_req->queue);
if (hs_req->req.complete) {
spin_unlock(&hsotg->lock);
usb_gadget_giveback_request(
&ep->ep, &hs_req->req);
spin_lock(&hsotg->lock);
}
}
/* If we have pending request, then start it */
if (!ep->req)
dwc2_gadget_start_next_request(ep);
}
break;
default:
return -ENOENT;
}
break;
default:
return -ENOENT;
}
return 1;
}
static void dwc2_hsotg_enqueue_setup(
struct dwc2_hsotg *hsotg);
/**
* dwc2_hsotg_stall_ep0 - stall ep0
* @hsotg: The device state
*
* Set stall for ep0 as response for setup request.
*/
static void dwc2_hsotg_stall_ep0(
struct dwc2_hsotg *hsotg)
{
struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
u32 reg;
u32 ctrl;
dev_dbg(hsotg->dev,
"ep0 stall (dir=%d)\n", ep0->dir_in);
reg = (ep0->dir_in) ? DIEPCTL0 : DOEPCTL0;
/*
* DxEPCTL_Stall will be cleared by EP once it has
* taken effect, so no need to clear later.
*/
ctrl = dwc2_readl(hsotg, reg);
ctrl |= DXEPCTL_STALL;
ctrl |= DXEPCTL_CNAK;
dwc2_writel(hsotg, ctrl, reg);
dev_dbg(hsotg->dev,
"written DXEPCTL=0x%08x to %08x (DXEPCTL=0x%08x)\n",
ctrl, reg, dwc2_readl(hsotg, reg));
/*
* complete won't be called, so we enqueue
* setup request here
*/
dwc2_hsotg_enqueue_setup(hsotg);
}
/**
* dwc2_hsotg_process_control - process a control request
* @hsotg: The device state
* @ctrl: The control request received
*
* The controller has received the SETUP phase of a control request, and
* needs to work out what to do next (and whether to pass it on to the
* gadget driver).
*/
static void dwc2_hsotg_process_control(
struct dwc2_hsotg *hsotg,
struct usb_ctrlrequest *ctrl)
{
struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
int ret = 0;
u32 dcfg;
dev_dbg(hsotg->dev,
"ctrl Type=%02x, Req=%02x, V=%04x, I=%04x, L=%04x\n",
ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
ctrl->wIndex, ctrl->wLength);
if (ctrl->wLength == 0) {
ep0->dir_in = 1;
hsotg->ep0_state = DWC2_EP0_STATUS_IN;
}
else if (ctrl->bRequestType & USB_DIR_IN) {
ep0->dir_in = 1;
hsotg->ep0_state = DWC2_EP0_DATA_IN;
}
else {
ep0->dir_in = 0;
hsotg->ep0_state = DWC2_EP0_DATA_OUT;
}
if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
switch (ctrl->bRequest) {
case USB_REQ_SET_ADDRESS:
hsotg->connected = 1;
dcfg = dwc2_readl(hsotg, DCFG);
dcfg &= ~DCFG_DEVADDR_MASK;
dcfg |= (le16_to_cpu(ctrl->wValue) <<
DCFG_DEVADDR_SHIFT) & DCFG_DEVADDR_MASK;
dwc2_writel(hsotg, dcfg, DCFG);
dev_info(hsotg->dev,
"new address %d\n", ctrl->wValue);
ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
return;
case USB_REQ_GET_STATUS:
ret = dwc2_hsotg_process_req_status(hsotg, ctrl);
break;
case USB_REQ_CLEAR_FEATURE:
case USB_REQ_SET_FEATURE:
ret = dwc2_hsotg_process_req_feature(hsotg, ctrl);
break;
}
}
/* as a fallback, try delivering it to the driver to deal with */
if (ret == 0 && hsotg->driver) {
spin_unlock(&hsotg->lock);
ret = hsotg->driver->setup(&hsotg->gadget, ctrl);
spin_lock(&hsotg->lock);
if (ret < 0)
dev_dbg(hsotg->dev,
"driver->setup() ret %d\n", ret);
}
hsotg->delayed_status =
false;
if (ret == USB_GADGET_DELAYED_STATUS)
hsotg->delayed_status =
true;
/*
* the request is either unhandlable, or is not formatted correctly
* so respond with a STALL for the status stage to indicate failure.
*/
if (ret < 0)
dwc2_hsotg_stall_ep0(hsotg);
}
/**
* dwc2_hsotg_complete_setup - completion of a setup transfer
* @ep: The endpoint the request was on.
* @req: The request completed.
*
* Called on completion of any requests the driver itself submitted for
* EP0 setup packets
*/
static void dwc2_hsotg_complete_setup(
struct usb_ep *ep,
struct usb_request *req)
{
struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
struct dwc2_hsotg *hsotg = hs_ep->parent;
if (req->status < 0) {
dev_dbg(hsotg->dev,
"%s: failed %d\n", __func__, req->status);
return;
}
spin_lock(&hsotg->lock);
if (req->actual == 0)
dwc2_hsotg_enqueue_setup(hsotg);
else
dwc2_hsotg_process_control(hsotg, req->buf);
spin_unlock(&hsotg->lock);
}
/**
* dwc2_hsotg_enqueue_setup - start a request for EP0 packets
* @hsotg: The device state.
*
* Enqueue a request on EP0 if necessary to received any SETUP packets
* received from the host.
*/
static void dwc2_hsotg_enqueue_setup(
struct dwc2_hsotg *hsotg)
{
struct usb_request *req = hsotg->ctrl_req;
struct dwc2_hsotg_req *hs_req = our_req(req);
int ret;
dev_dbg(hsotg->dev,
"%s: queueing setup request\n", __func__);
req->zero = 0;
req->length = 8;
req->buf = hsotg->ctrl_buff;
req->complete = dwc2_hsotg_complete_setup;
if (!list_empty(&hs_req->queue)) {
dev_dbg(hsotg->dev,
"%s already queued???\n", __func__);
return;
}
hsotg->eps_out[0]->dir_in = 0;
hsotg->eps_out[0]->send_zlp = 0;
hsotg->ep0_state = DWC2_EP0_SETUP;
ret = dwc2_hsotg_ep_queue(&hsotg->eps_out[0]->ep, req, GFP_ATOMIC);
if (ret < 0) {
dev_err(hsotg->dev,
"%s: failed queue (%d)\n", __func__, ret);
/*
* Don't think there's much we can do other than watch the
* driver fail.
*/
}
}
static void dwc2_hsotg_program_zlp(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep)
{
u32 ctrl;
u8 index = hs_ep->index;
u32 epctl_reg = hs_ep->dir_in ? DIEPCTL(index) : DOEPCTL(index);
u32 epsiz_reg = hs_ep->dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index);
if (hs_ep->dir_in)
dev_dbg(hsotg->dev,
"Sending zero-length packet on ep%d\n",
index);
else
dev_dbg(hsotg->dev,
"Receiving zero-length packet on ep%d\n",
index);
if (using_desc_dma(hsotg)) {
/* Not specific buffer needed for ep0 ZLP */
dma_addr_t dma = hs_ep->desc_list_dma;
if (!index)
dwc2_gadget_set_ep0_desc_chain(hsotg, hs_ep);
dwc2_gadget_config_nonisoc_xfer_ddma(hs_ep, dma, 0);
}
else {
dwc2_writel(hsotg, DXEPTSIZ_MC(1) | DXEPTSIZ_PKTCNT(1) |
DXEPTSIZ_XFERSIZE(0),
epsiz_reg);
}
ctrl = dwc2_readl(hsotg, epctl_reg);
ctrl |= DXEPCTL_CNAK;
/* clear NAK set by core */
ctrl |= DXEPCTL_EPENA;
/* ensure ep enabled */
ctrl |= DXEPCTL_USBACTEP;
dwc2_writel(hsotg, ctrl, epctl_reg);
}
/**
* dwc2_hsotg_complete_request - complete a request given to us
* @hsotg: The device state.
* @hs_ep: The endpoint the request was on.
* @hs_req: The request to complete.
* @result: The result code (0 => Ok, otherwise errno)
*
* The given request has finished, so call the necessary completion
* if it has one and then look to see if we can start a new request
* on the endpoint.
*
* Note, expects the ep to already be locked as appropriate.
*/
static void dwc2_hsotg_complete_request(
struct dwc2_hsotg *hsotg,
struct dwc2_hsotg_ep *hs_ep,
struct dwc2_hsotg_req *hs_req,
int result)
{
if (!hs_req) {
dev_dbg(hsotg->dev,
"%s: nothing to complete?\n", __func__);
return;
}
dev_dbg(hsotg->dev,
"complete: ep %p %s, req %p, %d => %p\n",
hs_ep, hs_ep->ep.name, hs_req, result, hs_req->req.complete);
/*
* only replace the status if we've not already set an error
* from a previous transaction
*/
if (hs_req->req.status == -EINPROGRESS)
hs_req->req.status = result;
if (using_dma(hsotg))
dwc2_hsotg_unmap_dma(hsotg, hs_ep, hs_req);
dwc2_hsotg_handle_unaligned_buf_complete(hsotg, hs_ep, hs_req);
hs_ep->req = NULL;
list_del_init(&hs_req->queue);
/*
* call the complete request with the locks off, just in case the
* request tries to queue more work for this endpoint.
*/
if (hs_req->req.complete) {
spin_unlock(&hsotg->lock);
usb_gadget_giveback_request(&hs_ep->ep, &hs_req->req);
spin_lock(&hsotg->lock);
}
/* In DDMA don't need to proceed to starting of next ISOC request */
if (using_desc_dma(hsotg) && hs_ep->isochronous)
return;
/*
* Look to see if there is anything else to do. Note, the completion
* of the previous request may have caused a new request to be started
* so be careful when doing this.
*/
if (!hs_ep->req && result >= 0)
dwc2_gadget_start_next_request(hs_ep);
}
/*
* dwc2_gadget_complete_isoc_request_ddma - complete an isoc request in DDMA
* @hs_ep: The endpoint the request was on.
*
* Get first request from the ep queue, determine descriptor on which complete
* happened. SW discovers which descriptor currently in use by HW, adjusts
* dma_address and calculates index of completed descriptor based on the value
* of DEPDMA register. Update actual length of request, giveback to gadget.
*/
static void dwc2_gadget_complete_isoc_request_ddma(
struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
struct dwc2_hsotg_req *hs_req;
struct usb_request *ureq;
u32 desc_sts;
u32 mask;
desc_sts = hs_ep->desc_list[hs_ep->compl_desc].status;
/* Process only descriptors with buffer status set to DMA done */
while ((desc_sts & DEV_DMA_BUFF_STS_MASK) >>
DEV_DMA_BUFF_STS_SHIFT == DEV_DMA_BUFF_STS_DMADONE) {
hs_req = get_ep_head(hs_ep);
if (!hs_req) {
dev_warn(hsotg->dev,
"%s: ISOC EP queue empty\n", __func__);
return;
}
ureq = &hs_req->req;
/* Check completion status */
if ((desc_sts & DEV_DMA_STS_MASK) >> DEV_DMA_STS_SHIFT ==
DEV_DMA_STS_SUCC) {
mask = hs_ep->dir_in ? DEV_DMA_ISOC_TX_NBYTES_MASK :
DEV_DMA_ISOC_RX_NBYTES_MASK;
ureq->actual = ureq->length - ((desc_sts & mask) >>
DEV_DMA_ISOC_NBYTES_SHIFT);
/* Adjust actual len for ISOC Out if len is
* not align of 4
*/
if (!hs_ep->dir_in && ureq->length & 0x3)
ureq->actual += 4 - (ureq->length & 0x3);
/* Set actual frame number for completed transfers */
ureq->frame_number =
(desc_sts & DEV_DMA_ISOC_FRNUM_MASK) >>
DEV_DMA_ISOC_FRNUM_SHIFT;
}
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
hs_ep->compl_desc++;
if (hs_ep->compl_desc > (MAX_DMA_DESC_NUM_HS_ISOC - 1))
hs_ep->compl_desc = 0;
desc_sts = hs_ep->desc_list[hs_ep->compl_desc].status;
}
}
/*
* dwc2_gadget_handle_isoc_bna - handle BNA interrupt for ISOC.
* @hs_ep: The isochronous endpoint.
*
* If EP ISOC OUT then need to flush RX FIFO to remove source of BNA
* interrupt. Reset target frame and next_desc to allow to start
* ISOC's on NAK interrupt for IN direction or on OUTTKNEPDIS
* interrupt for OUT direction.
*/
static void dwc2_gadget_handle_isoc_bna(
struct dwc2_hsotg_ep *hs_ep)
{
struct dwc2_hsotg *hsotg = hs_ep->parent;
if (!hs_ep->dir_in)
dwc2_flush_rx_fifo(hsotg);
dwc2_hsotg_complete_request(hsotg, hs_ep, get_ep_head(hs_ep), 0);
hs_ep->target_frame = TARGET_FRAME_INITIAL;
hs_ep->next_desc = 0;
hs_ep->compl_desc = 0;
}
/**
* dwc2_hsotg_rx_data - receive data from the FIFO for an endpoint
* @hsotg: The device state.
* @ep_idx: The endpoint index for the data
* @size: The size of data in the fifo, in bytes
*
* The FIFO status shows there is data to read from the FIFO for a given
* endpoint, so sort out whether we need to read the data into a request
* that has been made for that endpoint.
*/
static void dwc2_hsotg_rx_data(
struct dwc2_hsotg *hsotg,
int ep_idx,
int size)
{
struct dwc2_hsotg_ep *hs_ep = hsotg->eps_out[ep_idx];
struct dwc2_hsotg_req *hs_req = hs_ep->req;
int to_read;
int max_req;
int read_ptr;
if (!hs_req) {
u32 epctl = dwc2_readl(hsotg, DOEPCTL(ep_idx));
int ptr;
dev_dbg(hsotg->dev,
"%s: FIFO %d bytes on ep%d but no req (DXEPCTl=0x%08x)\n",
__func__, size, ep_idx, epctl);
/* dump the data from the FIFO, we've nothing we can do */
for (ptr = 0; ptr < size; ptr += 4)
(
void)dwc2_readl(hsotg, EPFIFO(ep_idx));
return;
}
to_read = size;
read_ptr = hs_req->req.actual;
max_req = hs_req->req.length - read_ptr;
dev_dbg(hsotg->dev,
"%s: read %d/%d, done %d/%d\n",
__func__, to_read, max_req, read_ptr, hs_req->req.length);
if (to_read > max_req) {
/*
* more data appeared than we where willing
* to deal with in this request.
*/
/* currently we don't deal this */
WARN_ON_ONCE(1);
}
hs_ep->total_data += to_read;
hs_req->req.actual += to_read;
to_read = DIV_ROUND_UP(to_read, 4);
/*
* note, we might over-write the buffer end by 3 bytes depending on
* alignment of the data.
*/
dwc2_readl_rep(hsotg, EPFIFO(ep_idx),
hs_req->req.buf + read_ptr, to_read);
}
/**
* dwc2_hsotg_ep0_zlp - send/receive zero-length packet on control endpoint
* @hsotg: The device instance
* @dir_in: If IN zlp
*
* Generate a zero-length IN packet request for terminating a SETUP
* transaction.
*
* Note, since we don't write any data to the TxFIFO, then it is
* currently believed that we do not need to wait for any space in
* the TxFIFO.
*/
static void dwc2_hsotg_ep0_zlp(
struct dwc2_hsotg *hsotg,
bool dir_in)
{
/* eps_out[0] is used in both directions */
hsotg->eps_out[0]->dir_in = dir_in;
hsotg->ep0_state = dir_in ? DWC2_EP0_STATUS_IN : DWC2_EP0_STATUS_OUT;
dwc2_hsotg_program_zlp(hsotg, hsotg->eps_out[0]);
}
/*
* dwc2_gadget_get_xfersize_ddma - get transferred bytes amount from desc
* @hs_ep - The endpoint on which transfer went
*
* Iterate over endpoints descriptor chain and get info on bytes remained
* in DMA descriptors after transfer has completed. Used for non isoc EPs.
*/
static unsigned int dwc2_gadget_get_xfersize_ddma(
struct dwc2_hsotg_ep *hs_ep)
{
const struct usb_endpoint_descriptor *ep_desc = hs_ep->ep.desc;
struct dwc2_hsotg *hsotg = hs_ep->parent;
unsigned int bytes_rem = 0;
unsigned int bytes_rem_correction = 0;
struct dwc2_dma_desc *desc = hs_ep->desc_list;
int i;
u32 status;
u32 mps = hs_ep->ep.maxpacket;
int dir_in = hs_ep->dir_in;
if (!desc)
return -EINVAL;
/* Interrupt OUT EP with mps not multiple of 4 */
if (hs_ep->index)
if (usb_endpoint_xfer_int(ep_desc) && !dir_in && (mps % 4))
bytes_rem_correction = 4 - (mps % 4);
for (i = 0; i < hs_ep->desc_count; ++i) {
status = desc->status;
bytes_rem += status & DEV_DMA_NBYTES_MASK;
bytes_rem -= bytes_rem_correction;
if (status & DEV_DMA_STS_MASK)
dev_err(hsotg->dev,
"descriptor %d closed with %x\n",
i, status & DEV_DMA_STS_MASK);
if (status & DEV_DMA_L)
break;
desc++;
}
return bytes_rem;
}
/**
* dwc2_hsotg_handle_outdone - handle receiving OutDone/SetupDone from RXFIFO
* @hsotg: The device instance
* @epnum: The endpoint received from
*
* The RXFIFO has delivered an OutDone event, which means that the data
* transfer for an OUT endpoint has been completed, either by a short
* packet or by the finish of a transfer.
*/
static void dwc2_hsotg_handle_outdone(
struct dwc2_hsotg *hsotg,
int epnum)
{
u32 epsize = dwc2_readl(hsotg, DOEPTSIZ(epnum));
struct dwc2_hsotg_ep *hs_ep = hsotg->eps_out[epnum];
struct dwc2_hsotg_req *hs_req = hs_ep->req;
struct usb_request *req = &hs_req->req;
unsigned int size_left = DXEPTSIZ_XFERSIZE_GET(epsize);
int result = 0;
if (!hs_req) {
dev_dbg(hsotg->dev,
"%s: no request active\n", __func__);
return;
}
if (epnum == 0 && hsotg->ep0_state == DWC2_EP0_STATUS_OUT) {
dev_dbg(hsotg->dev,
"zlp packet received\n");
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
dwc2_hsotg_enqueue_setup(hsotg);
return;
}
if (using_desc_dma(hsotg))
size_left = dwc2_gadget_get_xfersize_ddma(hs_ep);
if (using_dma(hsotg)) {
unsigned int size_done;
/*
* Calculate the size of the transfer by checking how much
* is left in the endpoint size register and then working it
* out from the amount we loaded for the transfer.
*
* We need to do this as DMA pointers are always 32bit aligned
* so may overshoot/undershoot the transfer.
*/
size_done = hs_ep->size_loaded - size_left;
size_done += hs_ep->last_load;
req->actual = size_done;
}
/* if there is more request to do, schedule new transfer */
if (req->actual < req->length && size_left == 0) {
dwc2_hsotg_start_req(hsotg, hs_ep, hs_req,
true);
return;
}
if (req->actual < req->length && req->short_not_ok) {
dev_dbg(hsotg->dev,
"%s: got %d/%d (short not ok) => error\n",
__func__, req->actual, req->length);
/*
* todo - what should we return here? there's no one else
* even bothering to check the status.
*/
}
/* DDMA IN status phase will start from StsPhseRcvd interrupt */
if (!using_desc_dma(hsotg) && epnum == 0 &&
hsotg->ep0_state == DWC2_EP0_DATA_OUT) {
/* Move to STATUS IN */
if (!hsotg->delayed_status)
dwc2_hsotg_ep0_zlp(hsotg,
true);
}
/* Set actual frame number for completed transfers */
if (!using_desc_dma(hsotg) && hs_ep->isochronous) {
req->frame_number = hs_ep->target_frame;
dwc2_gadget_incr_frame_num(hs_ep);
}
dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, result);
}
/**
* dwc2_hsotg_handle_rx - RX FIFO has data
* @hsotg: The device instance
*
* The IRQ handler has detected that the RX FIFO has some data in it
--> --------------------
--> maximum size reached
--> --------------------
