/** * dwc2_enable_common_interrupts() - Initializes the commmon interrupts, * used in both device and host modes * * @hsotg: Programming view of the DWC_otg controller
*/ staticvoid dwc2_enable_common_interrupts(struct dwc2_hsotg *hsotg)
{
u32 intmsk;
/* Clear any pending OTG Interrupts */
dwc2_writel(hsotg, 0xffffffff, GOTGINT);
/* Clear any pending interrupts */
dwc2_writel(hsotg, 0xffffffff, GINTSTS);
/* Enable the interrupts in the GINTMSK */
intmsk = GINTSTS_MODEMIS | GINTSTS_OTGINT;
if (!hsotg->params.host_dma)
intmsk |= GINTSTS_RXFLVL; if (!hsotg->params.external_id_pin_ctl)
intmsk |= GINTSTS_CONIDSTSCHNG;
switch (hsotg->hw_params.op_mode) { case GHWCFG2_OP_MODE_HNP_SRP_CAPABLE: if (hsotg->params.otg_caps.hnp_support &&
hsotg->params.otg_caps.srp_support)
usbcfg |= GUSBCFG_HNPCAP;
fallthrough;
case GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE: case GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE: case GHWCFG2_OP_MODE_SRP_CAPABLE_HOST: if (hsotg->params.otg_caps.srp_support)
usbcfg |= GUSBCFG_SRPCAP; break;
case GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE: case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE: case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST: default: break;
}
dwc2_writel(hsotg, usbcfg, GUSBCFG);
}
staticint dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
{ if (hsotg->vbus_supply) return regulator_enable(hsotg->vbus_supply);
return 0;
}
staticint dwc2_vbus_supply_exit(struct dwc2_hsotg *hsotg)
{ if (hsotg->vbus_supply) return regulator_disable(hsotg->vbus_supply);
/* * dwc2_calculate_dynamic_fifo() - Calculates the default fifo size * For system that have a total fifo depth that is smaller than the default * RX + TX fifo size. * * @hsotg: Programming view of DWC_otg controller
*/ staticvoid dwc2_calculate_dynamic_fifo(struct dwc2_hsotg *hsotg)
{ struct dwc2_core_params *params = &hsotg->params; struct dwc2_hw_params *hw = &hsotg->hw_params;
u32 rxfsiz, nptxfsiz, ptxfsiz, total_fifo_size;
/* * Will use Method 2 defined in the DWC2 spec: minimum FIFO depth * allocation with support for high bandwidth endpoints. Synopsys * defines MPS(Max Packet size) for a periodic EP=1024, and for * non-periodic as 512.
*/ if (total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz)) { /* * For Buffer DMA mode/Scatter Gather DMA mode * 2 * ((Largest Packet size / 4) + 1 + 1) + n * with n = number of host channel. * 2 * ((1024/4) + 2) = 516
*/
rxfsiz = 516 + hw->host_channels;
/* * min non-periodic tx fifo depth * 2 * (largest non-periodic USB packet used / 4) * 2 * (512/4) = 256
*/
nptxfsiz = 256;
/* * If the summation of RX, NPTX and PTX fifo sizes is still * bigger than the total_fifo_size, then we have a problem. * * We won't be able to allocate as many endpoints. Right now, * we're just printing an error message, but ideally this FIFO * allocation algorithm would be improved in the future. * * FIXME improve this FIFO allocation algorithm.
*/ if (unlikely(total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz)))
dev_err(hsotg->dev, "invalid fifo sizes\n");
}
if (hsotg->params.en_multiple_tx_fifo &&
hsotg->hw_params.snpsid >= DWC2_CORE_REV_2_91a) { /* * This feature was implemented in 2.91a version * Global DFIFOCFG calculation for Host mode - * include RxFIFO, NPTXFIFO and HPTXFIFO
*/
dfifocfg = dwc2_readl(hsotg, GDFIFOCFG);
dfifocfg &= ~GDFIFOCFG_EPINFOBASE_MASK;
dfifocfg |= (params->host_rx_fifo_size +
params->host_nperio_tx_fifo_size +
params->host_perio_tx_fifo_size) <<
GDFIFOCFG_EPINFOBASE_SHIFT &
GDFIFOCFG_EPINFOBASE_MASK;
dwc2_writel(hsotg, dfifocfg, GDFIFOCFG);
}
}
/** * dwc2_calc_frame_interval() - Calculates the correct frame Interval value for * the HFIR register according to PHY type and speed * * @hsotg: Programming view of DWC_otg controller * * NOTE: The caller can modify the value of the HFIR register only after the * Port Enable bit of the Host Port Control and Status register (HPRT.EnaPort) * has been set
*/
u32 dwc2_calc_frame_interval(struct dwc2_hsotg *hsotg)
{
u32 usbcfg;
u32 hprt0; int clock = 60; /* default value */
if ((hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT == HPRT0_SPD_HIGH_SPEED) /* High speed case */ return 125 * clock - 1;
/* FS/LS case */ return 1000 * clock - 1;
}
/** * dwc2_read_packet() - Reads a packet from the Rx FIFO into the destination * buffer * * @hsotg: Programming view of DWC_otg controller * @dest: Destination buffer for the packet * @bytes: Number of bytes to copy to the destination
*/ void dwc2_read_packet(struct dwc2_hsotg *hsotg, u8 *dest, u16 bytes)
{
u32 *data_buf = (u32 *)dest; int word_count = (bytes + 3) / 4; int i;
/* * Todo: Account for the case where dest is not dword aligned. This * requires reading data from the FIFO into a u32 temp buffer, then * moving it into the data buffer.
*/
for (i = 0; i < word_count; i++, data_buf++)
*data_buf = dwc2_readl(hsotg, HCFIFO(0));
}
/** * dwc2_dump_channel_info() - Prints the state of a host channel * * @hsotg: Programming view of DWC_otg controller * @chan: Pointer to the channel to dump * * Must be called with interrupt disabled and spinlock held * * NOTE: This function will be removed once the peripheral controller code * is integrated and the driver is stable
*/ staticvoid dwc2_dump_channel_info(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{ #ifdef VERBOSE_DEBUG int num_channels = hsotg->params.host_channels; struct dwc2_qh *qh;
u32 hcchar;
u32 hcsplt;
u32 hctsiz;
u32 hc_dma; int i;
if (hsotg->params.host_dma) { if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "DMA enabled\n");
dwc2_hc_enable_dma_ints(hsotg, chan);
} else { if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "DMA disabled\n");
dwc2_hc_enable_slave_ints(hsotg, chan);
}
/* Enable the top level host channel interrupt */
intmsk = dwc2_readl(hsotg, HAINTMSK);
intmsk |= 1 << chan->hc_num;
dwc2_writel(hsotg, intmsk, HAINTMSK); if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "set HAINTMSK to %08x\n", intmsk);
/* Make sure host channel interrupts are enabled */
intmsk = dwc2_readl(hsotg, GINTMSK);
intmsk |= GINTSTS_HCHINT;
dwc2_writel(hsotg, intmsk, GINTMSK); if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "set GINTMSK to %08x\n", intmsk);
}
/** * dwc2_hc_init() - Prepares a host channel for transferring packets to/from * a specific endpoint * * @hsotg: Programming view of DWC_otg controller * @chan: Information needed to initialize the host channel * * The HCCHARn register is set up with the characteristics specified in chan. * Host channel interrupts that may need to be serviced while this transfer is * in progress are enabled.
*/ staticvoid dwc2_hc_init(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
u8 hc_num = chan->hc_num;
u32 hcintmsk;
u32 hcchar;
u32 hcsplt = 0;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s()\n", __func__);
/* Clear old interrupt conditions for this host channel */
hcintmsk = 0xffffffff;
hcintmsk &= ~HCINTMSK_RESERVED14_31;
dwc2_writel(hsotg, hcintmsk, HCINT(hc_num));
/* Enable channel interrupts required for this transfer */
dwc2_hc_enable_ints(hsotg, chan);
/* * Program the HCCHARn register with the endpoint characteristics for * the current transfer
*/
hcchar = chan->dev_addr << HCCHAR_DEVADDR_SHIFT & HCCHAR_DEVADDR_MASK;
hcchar |= chan->ep_num << HCCHAR_EPNUM_SHIFT & HCCHAR_EPNUM_MASK; if (chan->ep_is_in)
hcchar |= HCCHAR_EPDIR; if (chan->speed == USB_SPEED_LOW)
hcchar |= HCCHAR_LSPDDEV;
hcchar |= chan->ep_type << HCCHAR_EPTYPE_SHIFT & HCCHAR_EPTYPE_MASK;
hcchar |= chan->max_packet << HCCHAR_MPS_SHIFT & HCCHAR_MPS_MASK;
dwc2_writel(hsotg, hcchar, HCCHAR(hc_num)); if (dbg_hc(chan)) {
dev_vdbg(hsotg->dev, "set HCCHAR(%d) to %08x\n",
hc_num, hcchar);
dev_vdbg(hsotg->dev, "%s: Channel %d\n",
__func__, hc_num);
dev_vdbg(hsotg->dev, " Dev Addr: %d\n",
chan->dev_addr);
dev_vdbg(hsotg->dev, " Ep Num: %d\n",
chan->ep_num);
dev_vdbg(hsotg->dev, " Is In: %d\n",
chan->ep_is_in);
dev_vdbg(hsotg->dev, " Is Low Speed: %d\n",
chan->speed == USB_SPEED_LOW);
dev_vdbg(hsotg->dev, " Ep Type: %d\n",
chan->ep_type);
dev_vdbg(hsotg->dev, " Max Pkt: %d\n",
chan->max_packet);
}
/* Program the HCSPLT register for SPLITs */ if (chan->do_split) { if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Programming HC %d with split --> %s\n",
hc_num,
chan->complete_split ? "CSPLIT" : "SSPLIT"); if (chan->complete_split)
hcsplt |= HCSPLT_COMPSPLT;
hcsplt |= chan->xact_pos << HCSPLT_XACTPOS_SHIFT &
HCSPLT_XACTPOS_MASK;
hcsplt |= chan->hub_addr << HCSPLT_HUBADDR_SHIFT &
HCSPLT_HUBADDR_MASK;
hcsplt |= chan->hub_port << HCSPLT_PRTADDR_SHIFT &
HCSPLT_PRTADDR_MASK; if (dbg_hc(chan)) {
dev_vdbg(hsotg->dev, " comp split %d\n",
chan->complete_split);
dev_vdbg(hsotg->dev, " xact pos %d\n",
chan->xact_pos);
dev_vdbg(hsotg->dev, " hub addr %d\n",
chan->hub_addr);
dev_vdbg(hsotg->dev, " hub port %d\n",
chan->hub_port);
dev_vdbg(hsotg->dev, " is_in %d\n",
chan->ep_is_in);
dev_vdbg(hsotg->dev, " Max Pkt %d\n",
chan->max_packet);
dev_vdbg(hsotg->dev, " xferlen %d\n",
chan->xfer_len);
}
}
dwc2_writel(hsotg, hcsplt, HCSPLT(hc_num));
}
/** * dwc2_hc_halt() - Attempts to halt a host channel * * @hsotg: Controller register interface * @chan: Host channel to halt * @halt_status: Reason for halting the channel * * This function should only be called in Slave mode or to abort a transfer in * either Slave mode or DMA mode. Under normal circumstances in DMA mode, the * controller halts the channel when the transfer is complete or a condition * occurs that requires application intervention. * * In slave mode, checks for a free request queue entry, then sets the Channel * Enable and Channel Disable bits of the Host Channel Characteristics * register of the specified channel to intiate the halt. If there is no free * request queue entry, sets only the Channel Disable bit of the HCCHARn * register to flush requests for this channel. In the latter case, sets a * flag to indicate that the host channel needs to be halted when a request * queue slot is open. * * In DMA mode, always sets the Channel Enable and Channel Disable bits of the * HCCHARn register. The controller ensures there is space in the request * queue before submitting the halt request. * * Some time may elapse before the core flushes any posted requests for this * host channel and halts. The Channel Halted interrupt handler completes the * deactivation of the host channel.
*/ void dwc2_hc_halt(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, enum dwc2_halt_status halt_status)
{
u32 nptxsts, hptxsts, hcchar;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s()\n", __func__);
/* * In buffer DMA or external DMA mode channel can't be halted * for non-split periodic channels. At the end of the next * uframe/frame (in the worst case), the core generates a channel * halted and disables the channel automatically.
*/ if ((hsotg->params.g_dma && !hsotg->params.g_dma_desc) ||
hsotg->hw_params.arch == GHWCFG2_EXT_DMA_ARCH) { if (!chan->do_split &&
(chan->ep_type == USB_ENDPOINT_XFER_ISOC ||
chan->ep_type == USB_ENDPOINT_XFER_INT)) {
dev_err(hsotg->dev, "%s() Channel can't be halted\n",
__func__); return;
}
}
if (halt_status == DWC2_HC_XFER_URB_DEQUEUE ||
halt_status == DWC2_HC_XFER_AHB_ERR) { /* * Disable all channel interrupts except Ch Halted. The QTD * and QH state associated with this transfer has been cleared * (in the case of URB_DEQUEUE), so the channel needs to be * shut down carefully to prevent crashes.
*/
u32 hcintmsk = HCINTMSK_CHHLTD;
/* * Make sure no other interrupts besides halt are currently * pending. Handling another interrupt could cause a crash due * to the QTD and QH state.
*/
dwc2_writel(hsotg, ~hcintmsk, HCINT(chan->hc_num));
/* * Make sure the halt status is set to URB_DEQUEUE or AHB_ERR * even if the channel was already halted for some other * reason
*/
chan->halt_status = halt_status;
hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num)); if (!(hcchar & HCCHAR_CHENA)) { /* * The channel is either already halted or it hasn't * started yet. In DMA mode, the transfer may halt if * it finishes normally or a condition occurs that * requires driver intervention. Don't want to halt * the channel again. In either Slave or DMA mode, * it's possible that the transfer has been assigned * to a channel, but not started yet when an URB is * dequeued. Don't want to halt a channel that hasn't * started yet.
*/ return;
}
} if (chan->halt_pending) { /* * A halt has already been issued for this channel. This might * happen when a transfer is aborted by a higher level in * the stack.
*/
dev_vdbg(hsotg->dev, "*** %s: Channel %d, chan->halt_pending already set ***\n",
__func__, chan->hc_num); return;
}
hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num));
/* No need to set the bit in DDMA for disabling the channel */ /* TODO check it everywhere channel is disabled */ if (!hsotg->params.dma_desc_enable) { if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "desc DMA disabled\n");
hcchar |= HCCHAR_CHENA;
} else { if (dbg_hc(chan))
dev_dbg(hsotg->dev, "desc DMA enabled\n");
}
hcchar |= HCCHAR_CHDIS;
if (!hsotg->params.host_dma) { if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "DMA not enabled\n");
hcchar |= HCCHAR_CHENA;
/* Check for space in the request queue to issue the halt */ if (chan->ep_type == USB_ENDPOINT_XFER_CONTROL ||
chan->ep_type == USB_ENDPOINT_XFER_BULK) {
dev_vdbg(hsotg->dev, "control/bulk\n");
nptxsts = dwc2_readl(hsotg, GNPTXSTS); if ((nptxsts & TXSTS_QSPCAVAIL_MASK) == 0) {
dev_vdbg(hsotg->dev, "Disabling channel\n");
hcchar &= ~HCCHAR_CHENA;
}
} else { if (dbg_perio())
dev_vdbg(hsotg->dev, "isoc/intr\n");
hptxsts = dwc2_readl(hsotg, HPTXSTS); if ((hptxsts & TXSTS_QSPCAVAIL_MASK) == 0 ||
hsotg->queuing_high_bandwidth) { if (dbg_perio())
dev_vdbg(hsotg->dev, "Disabling channel\n");
hcchar &= ~HCCHAR_CHENA;
}
}
} else { if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "DMA enabled\n");
}
/** * dwc2_hc_cleanup() - Clears the transfer state for a host channel * * @hsotg: Programming view of DWC_otg controller * @chan: Identifies the host channel to clean up * * This function is normally called after a transfer is done and the host * channel is being released
*/ void dwc2_hc_cleanup(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
u32 hcintmsk;
/** * dwc2_hc_set_even_odd_frame() - Sets the channel property that indicates in * which frame a periodic transfer should occur * * @hsotg: Programming view of DWC_otg controller * @chan: Identifies the host channel to set up and its properties * @hcchar: Current value of the HCCHAR register for the specified host channel * * This function has no effect on non-periodic transfers
*/ staticvoid dwc2_hc_set_even_odd_frame(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, u32 *hcchar)
{ if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC) { int host_speed; int xfer_ns; int xfer_us; int bytes_in_fifo;
u16 fifo_space;
u16 frame_number;
u16 wire_frame;
/* * Try to figure out if we're an even or odd frame. If we set * even and the current frame number is even the transfer * will happen immediately. Similar if both are odd. If one is * even and the other is odd then the transfer will happen when * the frame number ticks. * * There's a bit of a balancing act to get this right. * Sometimes we may want to send data in the current frame (AK * right away). We might want to do this if the frame number * _just_ ticked, but we might also want to do this in order * to continue a split transaction that happened late in a * microframe (so we didn't know to queue the next transfer * until the frame number had ticked). The problem is that we * need a lot of knowledge to know if there's actually still * time to send things or if it would be better to wait until * the next frame. * * We can look at how much time is left in the current frame * and make a guess about whether we'll have time to transfer. * We'll do that.
*/
/* Get speed host is running at */
host_speed = (chan->speed != USB_SPEED_HIGH &&
!chan->do_split) ? chan->speed : USB_SPEED_HIGH;
/* See how many bytes are in the periodic FIFO right now */
fifo_space = (dwc2_readl(hsotg, HPTXSTS) &
TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT;
bytes_in_fifo = sizeof(u32) *
(hsotg->params.host_perio_tx_fifo_size -
fifo_space);
/* * Roughly estimate bus time for everything in the periodic * queue + our new transfer. This is "rough" because we're * using a function that makes takes into account IN/OUT * and INT/ISO and we're just slamming in one value for all * transfers. This should be an over-estimate and that should * be OK, but we can probably tighten it.
*/
xfer_ns = usb_calc_bus_time(host_speed, false, false,
chan->xfer_len + bytes_in_fifo);
xfer_us = NS_TO_US(xfer_ns);
/* See what frame number we'll be at by the time we finish */
frame_number = dwc2_hcd_get_future_frame_number(hsotg, xfer_us);
/* This is when we were scheduled to be on the wire */
wire_frame = dwc2_frame_num_inc(chan->qh->next_active_frame, 1);
/* * If we'd finish _after_ the frame we're scheduled in then * it's hopeless. Just schedule right away and hope for the * best. Note that it _might_ be wise to call back into the * scheduler to pick a better frame, but this is better than * nothing.
*/ if (dwc2_frame_num_gt(frame_number, wire_frame)) {
dwc2_sch_vdbg(hsotg, "QH=%p EO MISS fr=%04x=>%04x (%+d)\n",
chan->qh, wire_frame, frame_number,
dwc2_frame_num_dec(frame_number,
wire_frame));
wire_frame = frame_number;
/* * We picked a different frame number; communicate this * back to the scheduler so it doesn't try to schedule * another in the same frame. * * Remember that next_active_frame is 1 before the wire * frame.
*/
chan->qh->next_active_frame =
dwc2_frame_num_dec(frame_number, 1);
}
staticvoid dwc2_set_pid_isoc(struct dwc2_host_chan *chan)
{ /* Set up the initial PID for the transfer */ if (chan->speed == USB_SPEED_HIGH) { if (chan->ep_is_in) { if (chan->multi_count == 1)
chan->data_pid_start = DWC2_HC_PID_DATA0; elseif (chan->multi_count == 2)
chan->data_pid_start = DWC2_HC_PID_DATA1; else
chan->data_pid_start = DWC2_HC_PID_DATA2;
} else { if (chan->multi_count == 1)
chan->data_pid_start = DWC2_HC_PID_DATA0; else
chan->data_pid_start = DWC2_HC_PID_MDATA;
}
} else {
chan->data_pid_start = DWC2_HC_PID_DATA0;
}
}
/** * dwc2_hc_write_packet() - Writes a packet into the Tx FIFO associated with * the Host Channel * * @hsotg: Programming view of DWC_otg controller * @chan: Information needed to initialize the host channel * * This function should only be called in Slave mode. For a channel associated * with a non-periodic EP, the non-periodic Tx FIFO is written. For a channel * associated with a periodic EP, the periodic Tx FIFO is written. * * Upon return the xfer_buf and xfer_count fields in chan are incremented by * the number of bytes written to the Tx FIFO.
*/ staticvoid dwc2_hc_write_packet(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
u32 i;
u32 remaining_count;
u32 byte_count;
u32 dword_count;
u32 *data_buf = (u32 *)chan->xfer_buf;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s()\n", __func__);
/** * dwc2_hc_do_ping() - Starts a PING transfer * * @hsotg: Programming view of DWC_otg controller * @chan: Information needed to initialize the host channel * * This function should only be called in Slave mode. The Do Ping bit is set in * the HCTSIZ register, then the channel is enabled.
*/ staticvoid dwc2_hc_do_ping(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
u32 hcchar;
u32 hctsiz;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
chan->hc_num);
/** * dwc2_hc_start_transfer() - Does the setup for a data transfer for a host * channel and starts the transfer * * @hsotg: Programming view of DWC_otg controller * @chan: Information needed to initialize the host channel. The xfer_len value * may be reduced to accommodate the max widths of the XferSize and * PktCnt fields in the HCTSIZn register. The multi_count value may be * changed to reflect the final xfer_len value. * * This function may be called in either Slave mode or DMA mode. In Slave mode, * the caller must ensure that there is sufficient space in the request queue * and Tx Data FIFO. * * For an OUT transfer in Slave mode, it loads a data packet into the * appropriate FIFO. If necessary, additional data packets are loaded in the * Host ISR. * * For an IN transfer in Slave mode, a data packet is requested. The data * packets are unloaded from the Rx FIFO in the Host ISR. If necessary, * additional data packets are requested in the Host ISR. * * For a PING transfer in Slave mode, the Do Ping bit is set in the HCTSIZ * register along with a packet count of 1 and the channel is enabled. This * causes a single PING transaction to occur. Other fields in HCTSIZ are * simply set to 0 since no data transfer occurs in this case. * * For a PING transfer in DMA mode, the HCTSIZ register is initialized with * all the information required to perform the subsequent data transfer. In * addition, the Do Ping bit is set in the HCTSIZ register. In this case, the * controller performs the entire PING protocol, then starts the data * transfer.
*/ staticvoid dwc2_hc_start_transfer(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
u32 max_hc_xfer_size = hsotg->params.max_transfer_size;
u16 max_hc_pkt_count = hsotg->params.max_packet_count;
u32 hcchar;
u32 hctsiz = 0;
u16 num_packets;
u32 ec_mc;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s()\n", __func__);
if (chan->do_ping) { if (!hsotg->params.host_dma) { if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "ping, no DMA\n");
dwc2_hc_do_ping(hsotg, chan);
chan->xfer_started = 1; return;
}
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "ping, DMA\n");
hctsiz |= TSIZ_DOPNG;
}
if (chan->do_split) { if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "split\n");
num_packets = 1;
if (chan->complete_split && !chan->ep_is_in) /* * For CSPLIT OUT Transfer, set the size to 0 so the * core doesn't expect any data written to the FIFO
*/
chan->xfer_len = 0; elseif (chan->ep_is_in || chan->xfer_len > chan->max_packet)
chan->xfer_len = chan->max_packet; elseif (!chan->ep_is_in && chan->xfer_len > 188)
chan->xfer_len = 188;
/* For split set ec_mc for immediate retries */ if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC)
ec_mc = 3; else
ec_mc = 1;
} else { if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "no split\n"); /* * Ensure that the transfer length and packet count will fit * in the widths allocated for them in the HCTSIZn register
*/ if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC) { /* * Make sure the transfer size is no larger than one * (micro)frame's worth of data. (A check was done * when the periodic transfer was accepted to ensure * that a (micro)frame's worth of data can be * programmed into a channel.)
*/
u32 max_periodic_len =
chan->multi_count * chan->max_packet;
if (chan->xfer_len > max_periodic_len)
chan->xfer_len = max_periodic_len;
} elseif (chan->xfer_len > max_hc_xfer_size) { /* * Make sure that xfer_len is a multiple of max packet * size
*/
chan->xfer_len =
max_hc_xfer_size - chan->max_packet + 1;
}
if (chan->xfer_len > 0) {
num_packets = (chan->xfer_len + chan->max_packet - 1) /
chan->max_packet; if (num_packets > max_hc_pkt_count) {
num_packets = max_hc_pkt_count;
chan->xfer_len = num_packets * chan->max_packet;
} elseif (chan->ep_is_in) { /* * Always program an integral # of max packets * for IN transfers. * Note: This assumes that the input buffer is * aligned and sized accordingly.
*/
chan->xfer_len = num_packets * chan->max_packet;
}
} else { /* Need 1 packet for transfer length of 0 */
num_packets = 1;
}
if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC) /* * Make sure that the multi_count field matches the * actual transfer length
*/
chan->multi_count = num_packets;
if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
dwc2_set_pid_isoc(chan);
/* Set host channel enable after all other setup is complete */
hcchar |= HCCHAR_CHENA;
hcchar &= ~HCCHAR_CHDIS;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, " Multi Cnt: %d\n",
(hcchar & HCCHAR_MULTICNT_MASK) >>
HCCHAR_MULTICNT_SHIFT);
dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num)); if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar,
chan->hc_num);
chan->xfer_started = 1;
chan->requests++;
if (!hsotg->params.host_dma &&
!chan->ep_is_in && chan->xfer_len > 0) /* Load OUT packet into the appropriate Tx FIFO */
dwc2_hc_write_packet(hsotg, chan);
}
/** * dwc2_hc_start_transfer_ddma() - Does the setup for a data transfer for a * host channel and starts the transfer in Descriptor DMA mode * * @hsotg: Programming view of DWC_otg controller * @chan: Information needed to initialize the host channel * * Initializes HCTSIZ register. For a PING transfer the Do Ping bit is set. * Sets PID and NTD values. For periodic transfers initializes SCHED_INFO field * with micro-frame bitmap. * * Initializes HCDMA register with descriptor list address and CTD value then * starts the transfer via enabling the channel.
*/ void dwc2_hc_start_transfer_ddma(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
u32 hcchar;
u32 hctsiz = 0;
if (chan->do_ping)
hctsiz |= TSIZ_DOPNG;
if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
dwc2_set_pid_isoc(chan);
/* Packet Count and Xfer Size are not used in Descriptor DMA mode */
hctsiz |= chan->data_pid_start << TSIZ_SC_MC_PID_SHIFT &
TSIZ_SC_MC_PID_MASK;
/* Set host channel enable after all other setup is complete */
hcchar |= HCCHAR_CHENA;
hcchar &= ~HCCHAR_CHDIS;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, " Multi Cnt: %d\n",
(hcchar & HCCHAR_MULTICNT_MASK) >>
HCCHAR_MULTICNT_SHIFT);
dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num)); if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar,
chan->hc_num);
chan->xfer_started = 1;
chan->requests++;
}
/** * dwc2_hc_continue_transfer() - Continues a data transfer that was started by * a previous call to dwc2_hc_start_transfer() * * @hsotg: Programming view of DWC_otg controller * @chan: Information needed to initialize the host channel * * The caller must ensure there is sufficient space in the request queue and Tx * Data FIFO. This function should only be called in Slave mode. In DMA mode, * the controller acts autonomously to complete transfers programmed to a host * channel. * * For an OUT transfer, a new data packet is loaded into the appropriate FIFO * if there is any data remaining to be queued. For an IN transfer, another * data packet is always requested. For the SETUP phase of a control transfer, * this function does nothing. * * Return: 1 if a new request is queued, 0 if no more requests are required * for this transfer
*/ staticint dwc2_hc_continue_transfer(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{ if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
chan->hc_num);
if (chan->do_split) /* SPLITs always queue just once per channel */ return 0;
if (chan->data_pid_start == DWC2_HC_PID_SETUP) /* SETUPs are queued only once since they can't be NAK'd */ return 0;
if (chan->ep_is_in) { /* * Always queue another request for other IN transfers. If * back-to-back INs are issued and NAKs are received for both, * the driver may still be processing the first NAK when the * second NAK is received. When the interrupt handler clears * the NAK interrupt for the first NAK, the second NAK will * not be seen. So we can't depend on the NAK interrupt * handler to requeue a NAK'd request. Instead, IN requests * are issued each time this function is called. When the * transfer completes, the extra requests for the channel will * be flushed.
*/
u32 hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num));
/* * Processes all the URBs in a single list of QHs. Completes them with * -ETIMEDOUT and frees the QTD. * * Must be called with interrupt disabled and spinlock held
*/ staticvoid dwc2_kill_urbs_in_qh_list(struct dwc2_hsotg *hsotg, struct list_head *qh_list)
{ struct dwc2_qh *qh, *qh_tmp; struct dwc2_qtd *qtd, *qtd_tmp;
/* Free each QTD in the QH's QTD list */
list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
qtd_list_entry)
dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
if (qh->channel && qh->channel->qh == qh)
qh->channel->qh = NULL;
/* * Responds with an error status of -ETIMEDOUT to all URBs in the non-periodic * and periodic schedules. The QTD associated with each URB is removed from * the schedule and freed. This function may be called when a disconnect is * detected or when the HCD is being stopped. * * Must be called with interrupt disabled and spinlock held
*/ staticvoid dwc2_kill_all_urbs(struct dwc2_hsotg *hsotg)
{
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_inactive);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_waiting);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_active);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_inactive);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_ready);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_assigned);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_queued);
}
/** * dwc2_hcd_start() - Starts the HCD when switching to Host mode * * @hsotg: Pointer to struct dwc2_hsotg
*/ void dwc2_hcd_start(struct dwc2_hsotg *hsotg)
{
u32 hprt0;
if (hsotg->op_state == OTG_STATE_B_HOST) { /* * Reset the port. During a HNP mode switch the reset * needs to occur within 1ms and have a duration of at * least 50ms.
*/
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 |= HPRT0_RST;
dwc2_writel(hsotg, hprt0, HPRT0);
}
/* Must be called with interrupt disabled and spinlock held */ staticvoid dwc2_hcd_cleanup_channels(struct dwc2_hsotg *hsotg)
{ int num_channels = hsotg->params.host_channels; struct dwc2_host_chan *channel;
u32 hcchar; int i;
if (!hsotg->params.host_dma) { /* Flush out any channel requests in slave mode */ for (i = 0; i < num_channels; i++) {
channel = hsotg->hc_ptr_array[i]; if (!list_empty(&channel->hc_list_entry)) continue;
hcchar = dwc2_readl(hsotg, HCCHAR(i)); if (hcchar & HCCHAR_CHENA) {
hcchar &= ~(HCCHAR_CHENA | HCCHAR_EPDIR);
hcchar |= HCCHAR_CHDIS;
dwc2_writel(hsotg, hcchar, HCCHAR(i));
}
}
}
for (i = 0; i < num_channels; i++) {
channel = hsotg->hc_ptr_array[i]; if (!list_empty(&channel->hc_list_entry)) continue;
hcchar = dwc2_readl(hsotg, HCCHAR(i)); if (hcchar & HCCHAR_CHENA) { /* Halt the channel */
hcchar |= HCCHAR_CHDIS;
dwc2_writel(hsotg, hcchar, HCCHAR(i));
}
dwc2_hc_cleanup(hsotg, channel);
list_add_tail(&channel->hc_list_entry, &hsotg->free_hc_list); /* * Added for Descriptor DMA to prevent channel double cleanup in * release_channel_ddma(), which is called from ep_disable when * device disconnects
*/
channel->qh = NULL;
} /* All channels have been freed, mark them available */ if (hsotg->params.uframe_sched) {
hsotg->available_host_channels =
hsotg->params.host_channels;
} else {
hsotg->non_periodic_channels = 0;
hsotg->periodic_channels = 0;
}
}
/** * dwc2_hcd_connect() - Handles connect of the HCD * * @hsotg: Pointer to struct dwc2_hsotg * * Must be called with interrupt disabled and spinlock held
*/ void dwc2_hcd_connect(struct dwc2_hsotg *hsotg)
{ if (hsotg->lx_state != DWC2_L0)
usb_hcd_resume_root_hub(hsotg->priv);
/** * dwc2_hcd_disconnect() - Handles disconnect of the HCD * * @hsotg: Pointer to struct dwc2_hsotg * @force: If true, we won't try to reconnect even if we see device connected. * * Must be called with interrupt disabled and spinlock held
*/ void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg, bool force)
{
u32 intr;
u32 hprt0;
/* Set status flags for the hub driver */
hsotg->flags.b.port_connect_status_change = 1;
hsotg->flags.b.port_connect_status = 0;
/* * Shutdown any transfers in process by clearing the Tx FIFO Empty * interrupt mask and status bits and disabling subsequent host * channel interrupts.
*/
intr = dwc2_readl(hsotg, GINTMSK);
intr &= ~(GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT);
dwc2_writel(hsotg, intr, GINTMSK);
intr = GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT;
dwc2_writel(hsotg, intr, GINTSTS);
/* * Turn off the vbus power only if the core has transitioned to device * mode. If still in host mode, need to keep power on to detect a * reconnection.
*/ if (dwc2_is_device_mode(hsotg)) { if (hsotg->op_state != OTG_STATE_A_SUSPEND) {
dev_dbg(hsotg->dev, "Disconnect: PortPower off\n");
dwc2_writel(hsotg, 0, HPRT0);
}
dwc2_disable_host_interrupts(hsotg);
}
/* Respond with an error status to all URBs in the schedule */
dwc2_kill_all_urbs(hsotg);
if (dwc2_is_host_mode(hsotg)) /* Clean up any host channels that were in use */
dwc2_hcd_cleanup_channels(hsotg);
dwc2_host_disconnect(hsotg);
/* * Add an extra check here to see if we're actually connected but * we don't have a detection interrupt pending. This can happen if: * 1. hardware sees connect * 2. hardware sees disconnect * 3. hardware sees connect * 4. dwc2_port_intr() - clears connect interrupt * 5. dwc2_handle_common_intr() - calls here * * Without the extra check here we will end calling disconnect * and won't get any future interrupts to handle the connect.
*/ if (!force) {
hprt0 = dwc2_readl(hsotg, HPRT0); if (!(hprt0 & HPRT0_CONNDET) && (hprt0 & HPRT0_CONNSTS))
dwc2_hcd_connect(hsotg);
}
}
if (hsotg->lx_state == DWC2_L1)
hsotg->flags.b.port_l1_change = 1;
}
/** * dwc2_hcd_stop() - Halts the DWC_otg host mode operations in a clean manner * * @hsotg: Pointer to struct dwc2_hsotg * * Must be called with interrupt disabled and spinlock held
*/ void dwc2_hcd_stop(struct dwc2_hsotg *hsotg)
{
dev_dbg(hsotg->dev, "DWC OTG HCD STOP\n");
/* * The root hub should be disconnected before this function is called. * The disconnect will clear the QTD lists (via ..._hcd_urb_dequeue) * and the QH lists (via ..._hcd_endpoint_disable).
*/
/* Turn off all host-specific interrupts */
dwc2_disable_host_interrupts(hsotg);
/* Turn off the vbus power */
dev_dbg(hsotg->dev, "PortPower off\n");
dwc2_writel(hsotg, 0, HPRT0);
}
/* Caller must hold driver lock */ staticint dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg, struct dwc2_hcd_urb *urb, struct dwc2_qh *qh, struct dwc2_qtd *qtd)
{
u32 intr_mask; int retval; int dev_speed;
if (!hsotg->flags.b.port_connect_status) { /* No longer connected */
dev_err(hsotg->dev, "Not connected\n"); return -ENODEV;
}
if (qtd->qh->ep_type == USB_ENDPOINT_XFER_BULK &&
!(qtd->urb->flags & URB_GIVEBACK_ASAP)) /* * Do not schedule SG transactions until qtd has * URB_GIVEBACK_ASAP set
*/ return 0;
tr_type = dwc2_hcd_select_transactions(hsotg); if (tr_type != DWC2_TRANSACTION_NONE)
dwc2_hcd_queue_transactions(hsotg, tr_type);
}
return 0;
}
/* Must be called with interrupt disabled and spinlock held */ staticint dwc2_hcd_urb_dequeue(struct dwc2_hsotg *hsotg, struct dwc2_hcd_urb *urb)
{ struct dwc2_qh *qh; struct dwc2_qtd *urb_qtd;
urb_qtd = urb->qtd; if (!urb_qtd) {
dev_dbg(hsotg->dev, "## Urb QTD is NULL ##\n"); return -EINVAL;
}
qh = urb_qtd->qh; if (!qh) {
dev_dbg(hsotg->dev, "## Urb QTD QH is NULL ##\n"); return -EINVAL;
}
urb->priv = NULL;
if (urb_qtd->in_process && qh->channel) {
dwc2_dump_channel_info(hsotg, qh->channel);
/* The QTD is in process (it has been assigned to a channel) */ if (hsotg->flags.b.port_connect_status) /* * If still connected (i.e. in host mode), halt the * channel so it can be used for other transfers. If * no longer connected, the host registers can't be * written to halt the channel since the core is in * device mode.
*/
dwc2_hc_halt(hsotg, qh->channel,
DWC2_HC_XFER_URB_DEQUEUE);
}
/* * Free the QTD and clean up the associated QH. Leave the QH in the * schedule if it has any remaining QTDs.
*/ if (!hsotg->params.dma_desc_enable) {
u8 in_process = urb_qtd->in_process;
/* Must NOT be called with interrupt disabled or spinlock held */ staticint dwc2_hcd_endpoint_disable(struct dwc2_hsotg *hsotg, struct usb_host_endpoint *ep, int retry)
{ struct dwc2_qtd *qtd, *qtd_tmp; struct dwc2_qh *qh; unsignedlong flags; int rc;
/* Free each QTD in the QH's QTD list */
list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, qtd_list_entry)
dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
ep->hcpriv = NULL;
if (qh->channel && qh->channel->qh == qh)
qh->channel->qh = NULL;
/* Must be called with interrupt disabled and spinlock held */ staticint dwc2_hcd_endpoint_reset(struct dwc2_hsotg *hsotg, struct usb_host_endpoint *ep)
{ struct dwc2_qh *qh = ep->hcpriv;
if (!qh) return -EINVAL;
qh->data_toggle = DWC2_HC_PID_DATA0;
return 0;
}
/** * dwc2_core_init() - Initializes the DWC_otg controller registers and * prepares the core for device mode or host mode operation * * @hsotg: Programming view of the DWC_otg controller * @initial_setup: If true then this is the first init for this instance.
*/ int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup)
{
u32 usbcfg, otgctl; int retval;
dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);
usbcfg = dwc2_readl(hsotg, GUSBCFG);
/* Set ULPI External VBUS bit if needed */
usbcfg &= ~GUSBCFG_ULPI_EXT_VBUS_DRV; if (hsotg->params.phy_ulpi_ext_vbus)
usbcfg |= GUSBCFG_ULPI_EXT_VBUS_DRV;
/* Set external TS Dline pulsing bit if needed */
usbcfg &= ~GUSBCFG_TERMSELDLPULSE; if (hsotg->params.ts_dline)
usbcfg |= GUSBCFG_TERMSELDLPULSE;
dwc2_writel(hsotg, usbcfg, GUSBCFG);
/* * Reset the Controller * * We only need to reset the controller if this is a re-init. * For the first init we know for sure that earlier code reset us (it * needed to in order to properly detect various parameters).
*/ if (!initial_setup) {
retval = dwc2_core_reset(hsotg, false); if (retval) {
dev_err(hsotg->dev, "%s(): Reset failed, aborting\n",
__func__); return retval;
}
}
/* * This needs to happen in FS mode before any other programming occurs
*/
retval = dwc2_phy_init(hsotg, initial_setup); if (retval) return retval;
/* Program the GAHBCFG Register */
retval = dwc2_gahbcfg_init(hsotg); if (retval) return retval;
/* Program the GUSBCFG register */
dwc2_gusbcfg_init(hsotg);
/* Program the GOTGCTL register */
otgctl = dwc2_readl(hsotg, GOTGCTL);
otgctl &= ~GOTGCTL_OTGVER;
dwc2_writel(hsotg, otgctl, GOTGCTL);
/* Clear the SRP success bit for FS-I2c */
hsotg->srp_success = 0;
/* Enable common interrupts */
dwc2_enable_common_interrupts(hsotg);
/* * Do device or host initialization based on mode during PCD and * HCD initialization
*/ if (dwc2_is_host_mode(hsotg)) {
dev_dbg(hsotg->dev, "Host Mode\n");
hsotg->op_state = OTG_STATE_A_HOST;
} else {
dev_dbg(hsotg->dev, "Device Mode\n");
hsotg->op_state = OTG_STATE_B_PERIPHERAL;
}
return 0;
}
/** * dwc2_core_host_init() - Initializes the DWC_otg controller registers for * Host mode * * @hsotg: Programming view of DWC_otg controller * * This function flushes the Tx and Rx FIFOs and flushes any entries in the * request queues. Host channels are reset to ensure that they are ready for * performing transfers.
*/ staticvoid dwc2_core_host_init(struct dwc2_hsotg *hsotg)
{
u32 hcfg, hfir, otgctl, usbcfg;
dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);
/* Set HS/FS Timeout Calibration to 7 (max available value). * The number of PHY clocks that the application programs in * this field is added to the high/full speed interpacket timeout * duration in the core to account for any additional delays * introduced by the PHY. This can be required, because the delay * introduced by the PHY in generating the linestate condition * can vary from one PHY to another.
*/
usbcfg = dwc2_readl(hsotg, GUSBCFG);
usbcfg |= GUSBCFG_TOUTCAL(7);
dwc2_writel(hsotg, usbcfg, GUSBCFG);
/* Restart the Phy Clock */
dwc2_writel(hsotg, 0, PCGCTL);
/* * This bit allows dynamic reloading of the HFIR register during * runtime. This bit needs to be programmed during initial configuration * and its value must not be changed during runtime.
*/ if (hsotg->params.reload_ctl) {
hfir = dwc2_readl(hsotg, HFIR);
hfir |= HFIR_RLDCTRL;
dwc2_writel(hsotg, hfir, HFIR);
}
if (hsotg->params.dma_desc_enable) {
u32 op_mode = hsotg->hw_params.op_mode;
if (hsotg->hw_params.snpsid < DWC2_CORE_REV_2_90a ||
!hsotg->hw_params.dma_desc_enable ||
op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE ||
op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE ||
op_mode == GHWCFG2_OP_MODE_UNDEFINED) {
dev_err(hsotg->dev, "Hardware does not support descriptor DMA mode -\n");
dev_err(hsotg->dev, "falling back to buffer DMA mode.\n");
hsotg->params.dma_desc_enable = false;
} else {
hcfg = dwc2_readl(hsotg, HCFG);
hcfg |= HCFG_DESCDMA;
dwc2_writel(hsotg, hcfg, HCFG);
}
}
/* Configure data FIFO sizes */
dwc2_config_fifos(hsotg);
/* TODO - check this */ /* Clear Host Set HNP Enable in the OTG Control Register */
otgctl = dwc2_readl(hsotg, GOTGCTL);
otgctl &= ~GOTGCTL_HSTSETHNPEN;
dwc2_writel(hsotg, otgctl, GOTGCTL);
/* Make sure the FIFOs are flushed */
dwc2_flush_tx_fifo(hsotg, 0x10 /* all TX FIFOs */);
dwc2_flush_rx_fifo(hsotg);
/* Clear Host Set HNP Enable in the OTG Control Register */
otgctl = dwc2_readl(hsotg, GOTGCTL);
otgctl &= ~GOTGCTL_HSTSETHNPEN;
dwc2_writel(hsotg, otgctl, GOTGCTL);
if (!hsotg->params.dma_desc_enable) { int num_channels, i;
u32 hcchar;
/* Flush out any leftover queued requests */
num_channels = hsotg->params.host_channels; for (i = 0; i < num_channels; i++) {
hcchar = dwc2_readl(hsotg, HCCHAR(i)); if (hcchar & HCCHAR_CHENA) {
hcchar &= ~HCCHAR_CHENA;
hcchar |= HCCHAR_CHDIS;
hcchar &= ~HCCHAR_EPDIR;
dwc2_writel(hsotg, hcchar, HCCHAR(i));
}
}
/* Halt all channels to put them into a known state */ for (i = 0; i < num_channels; i++) {
hcchar = dwc2_readl(hsotg, HCCHAR(i)); if (hcchar & HCCHAR_CHENA) {
hcchar |= HCCHAR_CHENA | HCCHAR_CHDIS;
hcchar &= ~HCCHAR_EPDIR;
dwc2_writel(hsotg, hcchar, HCCHAR(i));
dev_dbg(hsotg->dev, "%s: Halt channel %d\n",
__func__, i);
if (dwc2_hsotg_wait_bit_clear(hsotg, HCCHAR(i),
HCCHAR_CHENA,
1000)) {
dev_warn(hsotg->dev, "Unable to clear enable on channel %d\n",
i);
}
}
}
}
/* Enable ACG feature in host mode, if supported */
dwc2_enable_acg(hsotg);
/* Turn on the vbus power */
dev_dbg(hsotg->dev, "Init: Port Power? op_state=%d\n", hsotg->op_state); if (hsotg->op_state == OTG_STATE_A_HOST) {
u32 hprt0 = dwc2_read_hprt0(hsotg);
dev_dbg(hsotg->dev, "Init: Power Port (%d)\n",
!!(hprt0 & HPRT0_PWR)); if (!(hprt0 & HPRT0_PWR)) {
hprt0 |= HPRT0_PWR;
dwc2_writel(hsotg, hprt0, HPRT0);
}
}
dwc2_enable_host_interrupts(hsotg);
}
/* * Initializes dynamic portions of the DWC_otg HCD state * * Must be called with interrupt disabled and spinlock held
*/ staticvoid dwc2_hcd_reinit(struct dwc2_hsotg *hsotg)
{ struct dwc2_host_chan *chan, *chan_tmp; int num_channels; int i;
/* * Put all channels in the free channel list and clean up channel * states
*/
list_for_each_entry_safe(chan, chan_tmp, &hsotg->free_hc_list,
hc_list_entry)
list_del_init(&chan->hc_list_entry);
num_channels = hsotg->params.host_channels; for (i = 0; i < num_channels; i++) {
chan = hsotg->hc_ptr_array[i];
list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list);
dwc2_hc_cleanup(hsotg, chan);
}
/* Initialize the DWC core for host mode operation */
dwc2_core_host_init(hsotg);
}
case DWC2_CONTROL_DATA:
dev_vdbg(hsotg->dev, " Control data transaction\n");
chan->data_pid_start = qtd->data_toggle; break;
case DWC2_CONTROL_STATUS: /* * Direction is opposite of data direction or IN if no * data
*/
dev_vdbg(hsotg->dev, " Control status transaction\n"); if (urb->length == 0)
chan->ep_is_in = 1; else
chan->ep_is_in =
dwc2_hcd_is_pipe_out(&urb->pipe_info); if (chan->ep_is_in)
chan->do_ping = 0;
chan->data_pid_start = DWC2_HC_PID_DATA1;
chan->xfer_len = 0; if (hsotg->params.host_dma)
chan->xfer_dma = hsotg->status_buf_dma; else
chan->xfer_buf = hsotg->status_buf; break;
} break;
case USB_ENDPOINT_XFER_BULK:
chan->ep_type = USB_ENDPOINT_XFER_BULK; break;
case USB_ENDPOINT_XFER_INT:
chan->ep_type = USB_ENDPOINT_XFER_INT; break;
case USB_ENDPOINT_XFER_ISOC:
chan->ep_type = USB_ENDPOINT_XFER_ISOC; if (hsotg->params.dma_desc_enable) break;
if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) return;
/* Restore urb->transfer_buffer from the end of the allocated area */
memcpy(&stored_xfer_buffer,
PTR_ALIGN(urb->transfer_buffer + urb->transfer_buffer_length,
dma_get_cache_alignment()), sizeof(urb->transfer_buffer));
if (usb_urb_dir_in(urb)) { if (usb_pipeisoc(urb->pipe))
length = urb->transfer_buffer_length; else
length = urb->actual_length;
/* * Allocate a buffer with enough padding for original transfer_buffer * pointer. This allocation is guaranteed to be aligned properly for * DMA
*/
kmalloc_size = urb->transfer_buffer_length +
(dma_get_cache_alignment() - 1) + sizeof(urb->transfer_buffer);
kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); if (!kmalloc_ptr) return -ENOMEM;
/* * Position value of original urb->transfer_buffer pointer to the end * of allocation for later referencing
*/
memcpy(PTR_ALIGN(kmalloc_ptr + urb->transfer_buffer_length,
dma_get_cache_alignment()),
&urb->transfer_buffer, sizeof(urb->transfer_buffer));
if (usb_urb_dir_out(urb))
memcpy(kmalloc_ptr, urb->transfer_buffer,
urb->transfer_buffer_length);
urb->transfer_buffer = kmalloc_ptr;
/** * dwc2_assign_and_init_hc() - Assigns transactions from a QTD to a free host * channel and initializes the host channel to perform the transactions. The * host channel is removed from the free list. * * @hsotg: The HCD state structure * @qh: Transactions from the first QTD for this QH are selected and assigned * to a free host channel
*/ staticint dwc2_assign_and_init_hc(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
{ struct dwc2_host_chan *chan; struct dwc2_hcd_urb *urb; struct dwc2_qtd *qtd;
if (dbg_qh(qh))
dev_vdbg(hsotg->dev, "%s(%p,%p)\n", __func__, hsotg, qh);
if (list_empty(&qh->qtd_list)) {
dev_dbg(hsotg->dev, "No QTDs in QH list\n"); return -ENOMEM;
}
if (list_empty(&hsotg->free_hc_list)) {
dev_dbg(hsotg->dev, "No free channel to assign\n"); return -ENOMEM;
}
/* * Use usb_pipedevice to determine device address. This address is * 0 before the SET_ADDRESS command and the correct address afterward.
*/
chan->dev_addr = dwc2_hcd_get_dev_addr(&urb->pipe_info);
chan->ep_num = dwc2_hcd_get_ep_num(&urb->pipe_info);
chan->speed = qh->dev_speed;
chan->max_packet = qh->maxp;
/* * The following values may be modified in the transfer type section * below. The xfer_len value may be reduced when the transfer is * started to accommodate the max widths of the XferSize and PktCnt * fields in the HCTSIZn register.
*/
/* Set the split attributes if required */ if (qh->do_split)
dwc2_hc_init_split(hsotg, chan, qtd, urb); else
chan->do_split = 0;
/* Set the transfer attributes */
dwc2_hc_init_xfer(hsotg, chan, qtd);
/* For non-dword aligned buffers */ if (hsotg->params.host_dma && qh->do_split &&
chan->ep_is_in && (chan->xfer_dma & 0x3)) {
dev_vdbg(hsotg->dev, "Non-aligned buffer\n"); if (dwc2_alloc_split_dma_aligned_buf(hsotg, qh, chan)) {
dev_err(hsotg->dev, "Failed to allocate memory to handle non-aligned buffer\n"); /* Add channel back to free list */
chan->align_buf = 0;
chan->multi_count = 0;
list_add_tail(&chan->hc_list_entry,
&hsotg->free_hc_list);
qtd->in_process = 0;
qh->channel = NULL; return -ENOMEM;
}
} else { /* * We assume that DMA is always aligned in non-split * case or split out case. Warn if not.
*/
WARN_ON_ONCE(hsotg->params.host_dma &&
(chan->xfer_dma & 0x3));
chan->align_buf = 0;
}
if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC) /* * This value may be modified when the transfer is started * to reflect the actual transfer length
*/
chan->multi_count = qh->maxp_mult;
if (hsotg->params.dma_desc_enable) {
chan->desc_list_addr = qh->desc_list_dma;
chan->desc_list_sz = qh->desc_list_sz;
}
dwc2_hc_init(hsotg, chan);
chan->qh = qh;
return 0;
}
/** * dwc2_hcd_select_transactions() - Selects transactions from the HCD transfer * schedule and assigns them to available host channels. Called from the HCD * interrupt handler functions. * * @hsotg: The HCD state structure * * Return: The types of new transactions that were assigned to host channels
*/ enum dwc2_transaction_type dwc2_hcd_select_transactions( struct dwc2_hsotg *hsotg)
{ enum dwc2_transaction_type ret_val = DWC2_TRANSACTION_NONE; struct list_head *qh_ptr; struct dwc2_qh *qh; int num_channels;
/* Process entries in the periodic ready list */
qh_ptr = hsotg->periodic_sched_ready.next; while (qh_ptr != &hsotg->periodic_sched_ready) { if (list_empty(&hsotg->free_hc_list)) break; if (hsotg->params.uframe_sched) { if (hsotg->available_host_channels <= 1) break;
hsotg->available_host_channels--;
}
qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry); if (dwc2_assign_and_init_hc(hsotg, qh)) { if (hsotg->params.uframe_sched)
hsotg->available_host_channels++; break;
}
/* * Move the QH from the periodic ready schedule to the * periodic assigned schedule
*/
qh_ptr = qh_ptr->next;
list_move_tail(&qh->qh_list_entry,
&hsotg->periodic_sched_assigned);
ret_val = DWC2_TRANSACTION_PERIODIC;
}
/* * Process entries in the inactive portion of the non-periodic * schedule. Some free host channels may not be used if they are * reserved for periodic transfers.
*/
num_channels = hsotg->params.host_channels;
qh_ptr = hsotg->non_periodic_sched_inactive.next; while (qh_ptr != &hsotg->non_periodic_sched_inactive) { if (!hsotg->params.uframe_sched &&
hsotg->non_periodic_channels >= num_channels -
hsotg->periodic_channels) break; if (list_empty(&hsotg->free_hc_list)) break;
qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry); if (hsotg->params.uframe_sched) { if (hsotg->available_host_channels < 1) break;
hsotg->available_host_channels--;
}
if (dwc2_assign_and_init_hc(hsotg, qh)) { if (hsotg->params.uframe_sched)
hsotg->available_host_channels++; break;
}
/* * Move the QH from the non-periodic inactive schedule to the * non-periodic active schedule
*/
qh_ptr = qh_ptr->next;
list_move_tail(&qh->qh_list_entry,
&hsotg->non_periodic_sched_active);
if (!hsotg->params.uframe_sched)
hsotg->non_periodic_channels++;
}
return ret_val;
}
/** * dwc2_queue_transaction() - Attempts to queue a single transaction request for * a host channel associated with either a periodic or non-periodic transfer * * @hsotg: The HCD state structure * @chan: Host channel descriptor associated with either a periodic or * non-periodic transfer * @fifo_dwords_avail: Number of DWORDs available in the periodic Tx FIFO * for periodic transfers or the non-periodic Tx FIFO * for non-periodic transfers * * Return: 1 if a request is queued and more requests may be needed to * complete the transfer, 0 if no more requests are required for this * transfer, -1 if there is insufficient space in the Tx FIFO * * This function assumes that there is space available in the appropriate * request queue. For an OUT transfer or SETUP transaction in Slave mode, * it checks whether space is available in the appropriate Tx FIFO. * * Must be called with interrupt disabled and spinlock held
*/ staticint dwc2_queue_transaction(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan,
u16 fifo_dwords_avail)
{ int retval = 0;
if (chan->do_split) /* Put ourselves on the list to keep order straight */
list_move_tail(&chan->split_order_list_entry,
&hsotg->split_order);
if (hsotg->params.host_dma && chan->qh) { if (hsotg->params.dma_desc_enable) { if (!chan->xfer_started ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
dwc2_hcd_start_xfer_ddma(hsotg, chan->qh);
chan->qh->ping_state = 0;
}
} elseif (!chan->xfer_started) {
dwc2_hc_start_transfer(hsotg, chan);
chan->qh->ping_state = 0;
}
} elseif (chan->halt_pending) { /* Don't queue a request if the channel has been halted */
} elseif (chan->halt_on_queue) {
dwc2_hc_halt(hsotg, chan, chan->halt_status);
} elseif (chan->do_ping) { if (!chan->xfer_started)
dwc2_hc_start_transfer(hsotg, chan);
} elseif (!chan->ep_is_in ||
chan->data_pid_start == DWC2_HC_PID_SETUP) { if ((fifo_dwords_avail * 4) >= chan->max_packet) { if (!chan->xfer_started) {
dwc2_hc_start_transfer(hsotg, chan);
retval = 1;
} else {
retval = dwc2_hc_continue_transfer(hsotg, chan);
}
} else {
retval = -1;
}
} else { if (!chan->xfer_started) {
dwc2_hc_start_transfer(hsotg, chan);
retval = 1;
} else {
retval = dwc2_hc_continue_transfer(hsotg, chan);
}
}
return retval;
}
/* * Processes periodic channels for the next frame and queues transactions for * these channels to the DWC_otg controller. After queueing transactions, the * Periodic Tx FIFO Empty interrupt is enabled if there are more transactions * to queue as Periodic Tx FIFO or request queue space becomes available. * Otherwise, the Periodic Tx FIFO Empty interrupt is disabled. * * Must be called with interrupt disabled and spinlock held
*/ staticvoid dwc2_process_periodic_channels(struct dwc2_hsotg *hsotg)
{ struct list_head *qh_ptr; struct dwc2_qh *qh;
u32 tx_status;
u32 fspcavail;
u32 gintmsk; int status; bool no_queue_space = false; bool no_fifo_space = false;
u32 qspcavail;
/* If empty list then just adjust interrupt enables */ if (list_empty(&hsotg->periodic_sched_assigned)) gotoexit;
if (dbg_perio())
dev_vdbg(hsotg->dev, "Queue periodic transactions\n");
/* Make sure EP's TT buffer is clean before queueing qtds */ if (qh->tt_buffer_dirty) {
qh_ptr = qh_ptr->next; continue;
}
/* * Set a flag if we're queuing high-bandwidth in slave mode. * The flag prevents any halts to get into the request queue in * the middle of multiple high-bandwidth packets getting queued.
*/ if (!hsotg->params.host_dma &&
qh->channel->multi_count > 1)
hsotg->queuing_high_bandwidth = 1;
/* * In Slave mode, stay on the current transfer until there is * nothing more to do or the high-bandwidth request count is * reached. In DMA mode, only need to queue one request. The * controller automatically handles multiple packets for * high-bandwidth transfers.
*/ if (hsotg->params.host_dma || status == 0 ||
qh->channel->requests == qh->channel->multi_count) {
qh_ptr = qh_ptr->next; /* * Move the QH from the periodic assigned schedule to * the periodic queued schedule
*/
list_move_tail(&qh->qh_list_entry,
&hsotg->periodic_sched_queued);
exit: if (no_queue_space || no_fifo_space ||
(!hsotg->params.host_dma &&
!list_empty(&hsotg->periodic_sched_assigned))) { /* * May need to queue more transactions as the request * queue or Tx FIFO empties. Enable the periodic Tx * FIFO empty interrupt. (Always use the half-empty * level to ensure that new requests are loaded as * soon as possible.)
*/
gintmsk = dwc2_readl(hsotg, GINTMSK); if (!(gintmsk & GINTSTS_PTXFEMP)) {
gintmsk |= GINTSTS_PTXFEMP;
dwc2_writel(hsotg, gintmsk, GINTMSK);
}
} else { /* * Disable the Tx FIFO empty interrupt since there are * no more transactions that need to be queued right * now. This function is called from interrupt * handlers to queue more transactions as transfer * states change.
*/
gintmsk = dwc2_readl(hsotg, GINTMSK); if (gintmsk & GINTSTS_PTXFEMP) {
gintmsk &= ~GINTSTS_PTXFEMP;
dwc2_writel(hsotg, gintmsk, GINTMSK);
}
}
}
/* * Processes active non-periodic channels and queues transactions for these * channels to the DWC_otg controller. After queueing transactions, the NP Tx * FIFO Empty interrupt is enabled if there are more transactions to queue as * NP Tx FIFO or request queue space becomes available. Otherwise, the NP Tx * FIFO Empty interrupt is disabled. * * Must be called with interrupt disabled and spinlock held
*/ staticvoid dwc2_process_non_periodic_channels(struct dwc2_hsotg *hsotg)
{ struct list_head *orig_qh_ptr; struct dwc2_qh *qh;
u32 tx_status;
u32 qspcavail;
u32 fspcavail;
u32 gintmsk; int status; int no_queue_space = 0; int no_fifo_space = 0; int more_to_do = 0;
/* * Keep track of the starting point. Skip over the start-of-list * entry.
*/ if (hsotg->non_periodic_qh_ptr == &hsotg->non_periodic_sched_active)
hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next;
orig_qh_ptr = hsotg->non_periodic_qh_ptr;
/* * Process once through the active list or until no more space is * available in the request queue or the Tx FIFO
*/ do {
tx_status = dwc2_readl(hsotg, GNPTXSTS);
qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
TXSTS_QSPCAVAIL_SHIFT; if (!hsotg->params.host_dma && qspcavail == 0) {
no_queue_space = 1; break;
}
qh = list_entry(hsotg->non_periodic_qh_ptr, struct dwc2_qh,
qh_list_entry); if (!qh->channel) goto next;
/* Make sure EP's TT buffer is clean before queueing qtds */ if (qh->tt_buffer_dirty) goto next;
if (more_to_do || no_queue_space || no_fifo_space) { /* * May need to queue more transactions as the request * queue or Tx FIFO empties. Enable the non-periodic * Tx FIFO empty interrupt. (Always use the half-empty * level to ensure that new requests are loaded as * soon as possible.)
*/
gintmsk = dwc2_readl(hsotg, GINTMSK);
gintmsk |= GINTSTS_NPTXFEMP;
dwc2_writel(hsotg, gintmsk, GINTMSK);
} else { /* * Disable the Tx FIFO empty interrupt since there are * no more transactions that need to be queued right * now. This function is called from interrupt * handlers to queue more transactions as transfer * states change.
*/
gintmsk = dwc2_readl(hsotg, GINTMSK);
gintmsk &= ~GINTSTS_NPTXFEMP;
dwc2_writel(hsotg, gintmsk, GINTMSK);
}
}
}
/** * dwc2_hcd_queue_transactions() - Processes the currently active host channels * and queues transactions for these channels to the DWC_otg controller. Called * from the HCD interrupt handler functions. * * @hsotg: The HCD state structure * @tr_type: The type(s) of transactions to queue (non-periodic, periodic, * or both) * * Must be called with interrupt disabled and spinlock held
*/ void dwc2_hcd_queue_transactions(struct dwc2_hsotg *hsotg, enum dwc2_transaction_type tr_type)
{ #ifdef DWC2_DEBUG_SOF
dev_vdbg(hsotg->dev, "Queue Transactions\n"); #endif /* Process host channels associated with periodic transfers */ if (tr_type == DWC2_TRANSACTION_PERIODIC ||
tr_type == DWC2_TRANSACTION_ALL)
dwc2_process_periodic_channels(hsotg);
/* Process host channels associated with non-periodic transfers */ if (tr_type == DWC2_TRANSACTION_NON_PERIODIC ||
tr_type == DWC2_TRANSACTION_ALL) { if (!list_empty(&hsotg->non_periodic_sched_active)) {
dwc2_process_non_periodic_channels(hsotg);
} else { /* * Ensure NP Tx FIFO empty interrupt is disabled when * there are no non-periodic transfers to process
*/
u32 gintmsk = dwc2_readl(hsotg, GINTMSK);
/* B-Device connector (Device Mode) */ if (gotgctl & GOTGCTL_CONID_B) {
dwc2_vbus_supply_exit(hsotg); /* Wait for switch to device mode */
dev_dbg(hsotg->dev, "connId B\n"); if (hsotg->bus_suspended) {
dev_info(hsotg->dev, "Do port resume before switching to device mode\n");
dwc2_port_resume(hsotg);
} while (!dwc2_is_device_mode(hsotg)) {
dev_info(hsotg->dev, "Waiting for Peripheral Mode, Mode=%s\n",
dwc2_is_host_mode(hsotg) ? "Host" : "Peripheral");
msleep(20); /* * Sometimes the initial GOTGCTRL read is wrong, so * check it again and jump to host mode if that was * the case.
*/
gotgctl = dwc2_readl(hsotg, GOTGCTL); if (!(gotgctl & GOTGCTL_CONID_B)) goto host; if (++count > 250) break;
} if (count > 250)
dev_err(hsotg->dev, "Connection id status change timed out\n");
/* * Exit Partial Power Down without restoring registers. * No need to check the return value as registers * are not being restored.
*/ if (hsotg->in_ppd && hsotg->lx_state == DWC2_L2)
dwc2_exit_partial_power_down(hsotg, 0, false);
hsotg->op_state = OTG_STATE_B_PERIPHERAL;
dwc2_core_init(hsotg, false);
dwc2_enable_global_interrupts(hsotg);
spin_lock_irqsave(&hsotg->lock, flags);
dwc2_hsotg_core_init_disconnected(hsotg, false);
spin_unlock_irqrestore(&hsotg->lock, flags); /* Enable ACG feature in device mode,if supported */
dwc2_enable_acg(hsotg);
dwc2_hsotg_core_connect(hsotg);
} else {
host: /* A-Device connector (Host Mode) */
dev_dbg(hsotg->dev, "connId A\n"); while (!dwc2_is_host_mode(hsotg)) {
dev_info(hsotg->dev, "Waiting for Host Mode, Mode=%s\n",
dwc2_is_host_mode(hsotg) ? "Host" : "Peripheral");
msleep(20); if (++count > 250) break;
} if (count > 250)
dev_err(hsotg->dev, "Connection id status change timed out\n");
/* * Clear the Resume after 70ms. (Need 20 ms minimum. Use 70 ms * so that OPT tests pass with all PHYs.)
*/
hprt0 = dwc2_read_hprt0(hsotg);
dev_dbg(hsotg->dev, "Resume: HPRT0=%0x\n", hprt0);
hprt0 &= ~HPRT0_RES;
dwc2_writel(hsotg, hprt0, HPRT0);
dev_dbg(hsotg->dev, "Clear Resume: HPRT0=%0x\n",
dwc2_readl(hsotg, HPRT0));
/** * dwc2_port_suspend() - Put controller in suspend mode for host. * * @hsotg: Programming view of the DWC_otg controller * @windex: The control request wIndex field * * Return: non-zero if failed to enter suspend mode for host. * * This function is for entering Host mode suspend. * Must NOT be called with interrupt disabled or spinlock held.
*/ int dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
{ unsignedlong flags;
u32 pcgctl;
u32 gotgctl; int ret = 0;
switch (hsotg->params.power_down) { case DWC2_POWER_DOWN_PARAM_PARTIAL:
ret = dwc2_enter_partial_power_down(hsotg); if (ret)
dev_err(hsotg->dev, "enter partial_power_down failed.\n"); break; case DWC2_POWER_DOWN_PARAM_HIBERNATION: /* * Perform spin unlock and lock because in * "dwc2_host_enter_hibernation()" function there is a spinlock * logic which prevents servicing of any IRQ during entering * hibernation.
*/
spin_unlock_irqrestore(&hsotg->lock, flags);
ret = dwc2_enter_hibernation(hsotg, 1); if (ret)
dev_err(hsotg->dev, "enter hibernation failed.\n");
spin_lock_irqsave(&hsotg->lock, flags); break; case DWC2_POWER_DOWN_PARAM_NONE: /* * If not hibernation nor partial power down are supported, * clock gating is used to save power.
*/ if (!hsotg->params.no_clock_gating)
dwc2_host_enter_clock_gating(hsotg); break;
}
/* For HNP the bus must be suspended for at least 200ms */ if (dwc2_host_is_b_hnp_enabled(hsotg)) {
pcgctl = dwc2_readl(hsotg, PCGCTL);
pcgctl &= ~PCGCTL_STOPPCLK;
dwc2_writel(hsotg, pcgctl, PCGCTL);
/** * dwc2_port_resume() - Exit controller from suspend mode for host. * * @hsotg: Programming view of the DWC_otg controller * * Return: non-zero if failed to exit suspend mode for host. * * This function is for exiting Host mode suspend. * Must NOT be called with interrupt disabled or spinlock held.
*/ int dwc2_port_resume(struct dwc2_hsotg *hsotg)
{ unsignedlong flags; int ret = 0;
spin_lock_irqsave(&hsotg->lock, flags);
switch (hsotg->params.power_down) { case DWC2_POWER_DOWN_PARAM_PARTIAL:
ret = dwc2_exit_partial_power_down(hsotg, 0, true); if (ret)
dev_err(hsotg->dev, "exit partial_power_down failed.\n"); break; case DWC2_POWER_DOWN_PARAM_HIBERNATION: /* Exit host hibernation. */
ret = dwc2_exit_hibernation(hsotg, 0, 0, 1); if (ret)
dev_err(hsotg->dev, "exit hibernation failed.\n"); break; case DWC2_POWER_DOWN_PARAM_NONE: /* * If not hibernation nor partial power down are supported, * port resume is done using the clock gating programming flow.
*/
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_host_exit_clock_gating(hsotg, 0);
spin_lock_irqsave(&hsotg->lock, flags); break;
}
case USB_PORT_FEAT_INDICATOR:
dev_dbg(hsotg->dev, "ClearPortFeature USB_PORT_FEAT_INDICATOR\n"); /* Port indicator not supported */ break;
case USB_PORT_FEAT_C_CONNECTION: /* * Clears driver's internal Connect Status Change flag
*/
dev_dbg(hsotg->dev, "ClearPortFeature USB_PORT_FEAT_C_CONNECTION\n");
hsotg->flags.b.port_connect_status_change = 0; break;
case USB_PORT_FEAT_C_RESET: /* Clears driver's internal Port Reset Change flag */
dev_dbg(hsotg->dev, "ClearPortFeature USB_PORT_FEAT_C_RESET\n");
hsotg->flags.b.port_reset_change = 0; break;
case USB_PORT_FEAT_C_ENABLE: /* * Clears the driver's internal Port Enable/Disable * Change flag
*/
dev_dbg(hsotg->dev, "ClearPortFeature USB_PORT_FEAT_C_ENABLE\n");
hsotg->flags.b.port_enable_change = 0; break;
case USB_PORT_FEAT_C_SUSPEND: /* * Clears the driver's internal Port Suspend Change * flag, which is set when resume signaling on the host * port is complete
*/
dev_dbg(hsotg->dev, "ClearPortFeature USB_PORT_FEAT_C_SUSPEND\n");
hsotg->flags.b.port_suspend_change = 0; break;
case USB_PORT_FEAT_C_PORT_L1:
dev_dbg(hsotg->dev, "ClearPortFeature USB_PORT_FEAT_C_PORT_L1\n");
hsotg->flags.b.port_l1_change = 0; break;
case USB_PORT_FEAT_C_OVER_CURRENT:
dev_dbg(hsotg->dev, "ClearPortFeature USB_PORT_FEAT_C_OVER_CURRENT\n");
hsotg->flags.b.port_over_current_change = 0; break;
case GetHubStatus:
dev_dbg(hsotg->dev, "GetHubStatus\n");
memset(buf, 0, 4); break;
case GetPortStatus:
dev_vdbg(hsotg->dev, "GetPortStatus wIndex=0x%04x flags=0x%08x\n", windex,
hsotg->flags.d32); if (!windex || windex > 1) goto error;
port_status = 0; if (hsotg->flags.b.port_connect_status_change)
port_status |= USB_PORT_STAT_C_CONNECTION << 16; if (hsotg->flags.b.port_enable_change)
port_status |= USB_PORT_STAT_C_ENABLE << 16; if (hsotg->flags.b.port_suspend_change)
port_status |= USB_PORT_STAT_C_SUSPEND << 16; if (hsotg->flags.b.port_l1_change)
port_status |= USB_PORT_STAT_C_L1 << 16; if (hsotg->flags.b.port_reset_change)
port_status |= USB_PORT_STAT_C_RESET << 16; if (hsotg->flags.b.port_over_current_change) {
dev_warn(hsotg->dev, "Overcurrent change detected\n");
port_status |= USB_PORT_STAT_C_OVERCURRENT << 16;
}
if (dwc2_is_device_mode(hsotg)) { /* * Just return 0's for the remainder of the port status * since the port register can't be read if the core * is in device mode.
*/
*(__le32 *)buf = cpu_to_le32(port_status); break;
}
if (hsotg->params.dma_desc_fs_enable) { /* * Enable descriptor DMA only if a full speed * device is connected.
*/ if (hsotg->new_connection &&
((port_status &
(USB_PORT_STAT_CONNECTION |
USB_PORT_STAT_HIGH_SPEED |
USB_PORT_STAT_LOW_SPEED)) ==
USB_PORT_STAT_CONNECTION)) {
u32 hcfg;
case SetHubFeature:
dev_dbg(hsotg->dev, "SetHubFeature\n"); /* No HUB features supported */ break;
case SetPortFeature:
dev_dbg(hsotg->dev, "SetPortFeature\n"); if (wvalue != USB_PORT_FEAT_TEST && (!windex || windex > 1)) goto error;
if (dwc2_is_device_mode(hsotg)) { /* * Just return 0's for the remainder of the port status * since the port register can't be read if the core * is in device mode.
*/ break;
}
switch (wvalue) { case USB_PORT_FEAT_SUSPEND:
dev_dbg(hsotg->dev, "SetPortFeature - USB_PORT_FEAT_SUSPEND\n"); if (windex != hsotg->otg_port) goto error; if (!hsotg->bus_suspended)
retval = dwc2_port_suspend(hsotg, windex); break;
case USB_PORT_FEAT_RESET:
dev_dbg(hsotg->dev, "SetPortFeature - USB_PORT_FEAT_RESET\n");
hprt0 = dwc2_read_hprt0(hsotg);
if (hsotg->hibernated) {
retval = dwc2_exit_hibernation(hsotg, 0, 1, 1); if (retval)
dev_err(hsotg->dev, "exit hibernation failed\n");
}
if (hsotg->in_ppd) {
retval = dwc2_exit_partial_power_down(hsotg, 1, true); if (retval)
dev_err(hsotg->dev, "exit partial_power_down failed\n");
}
if (hsotg->params.power_down ==
DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
dwc2_host_exit_clock_gating(hsotg, 0);
pcgctl = dwc2_readl(hsotg, PCGCTL);
pcgctl &= ~(PCGCTL_ENBL_SLEEP_GATING | PCGCTL_STOPPCLK);
dwc2_writel(hsotg, pcgctl, PCGCTL); /* ??? Original driver does this */
dwc2_writel(hsotg, 0, PCGCTL);
hprt0 = dwc2_read_hprt0(hsotg);
pwr = hprt0 & HPRT0_PWR; /* Clear suspend bit if resetting from suspend state */
hprt0 &= ~HPRT0_SUSP;
/* * When B-Host the Port reset bit is set in the Start * HCD Callback function, so that the reset is started * within 1ms of the HNP success interrupt
*/ if (!dwc2_hcd_is_b_host(hsotg)) {
hprt0 |= HPRT0_PWR | HPRT0_RST;
dev_dbg(hsotg->dev, "In host mode, hprt0=%08x\n", hprt0);
dwc2_writel(hsotg, hprt0, HPRT0); if (!pwr)
dwc2_vbus_supply_init(hsotg);
}
/* Clear reset bit in 10ms (FS/LS) or 50ms (HS) */
msleep(50);
hprt0 &= ~HPRT0_RST;
dwc2_writel(hsotg, hprt0, HPRT0);
hsotg->lx_state = DWC2_L0; /* Now back to On state */ break;
case USB_PORT_FEAT_INDICATOR:
dev_dbg(hsotg->dev, "SetPortFeature - USB_PORT_FEAT_INDICATOR\n"); /* Not supported */ break;
/* * Number of phy clocks since the last tick of the frame number after * "us" has passed.
*/
phy_clks = (interval - remaining) +
DIV_ROUND_UP(interval * us, us_per_frame);
/* * NOTE: This function will be removed once the peripheral controller code * is integrated and the driver is stable
*/ void dwc2_hcd_dump_state(struct dwc2_hsotg *hsotg)
{ #ifdef DEBUG struct dwc2_host_chan *chan; struct dwc2_hcd_urb *urb; struct dwc2_qtd *qtd; int num_channels;
u32 np_tx_status;
u32 p_tx_status; int i;
/* Gets the dwc2_hsotg from a usb_hcd */ staticstruct dwc2_hsotg *dwc2_hcd_to_hsotg(struct usb_hcd *hcd)
{ struct wrapper_priv_data *p;
p = (struct wrapper_priv_data *)&hcd->hcd_priv; return p->hsotg;
}
/** * dwc2_host_get_tt_info() - Get the dwc2_tt associated with context * * This will get the dwc2_tt structure (and ttport) associated with the given * context (which is really just a struct urb pointer). * * The first time this is called for a given TT we allocate memory for our * structure. When everyone is done and has called dwc2_host_put_tt_info() * then the refcount for the structure will go to 0 and we'll free it. * * @hsotg: The HCD state structure for the DWC OTG controller. * @context: The priv pointer from a struct dwc2_hcd_urb. * @mem_flags: Flags for allocating memory. * @ttport: We'll return this device's port number here. That's used to * reference into the bitmap if we're on a multi_tt hub. * * Return: a pointer to a struct dwc2_tt. Don't forget to call * dwc2_host_put_tt_info()! Returns NULL upon memory alloc failure.
*/
dwc_tt = urb->dev->tt->hcpriv; if (!dwc_tt) {
size_t bitmap_size;
/* * For single_tt we need one schedule. For multi_tt * we need one per port.
*/
bitmap_size = DWC2_ELEMENTS_PER_LS_BITMAP * sizeof(dwc_tt->periodic_bitmaps[0]); if (urb->dev->tt->multi)
bitmap_size *= urb->dev->tt->hub->maxchild;
dwc_tt = kzalloc(sizeof(*dwc_tt) + bitmap_size,
mem_flags); if (!dwc_tt) return NULL;
/** * dwc2_host_put_tt_info() - Put the dwc2_tt from dwc2_host_get_tt_info() * * Frees resources allocated by dwc2_host_get_tt_info() if all current holders * of the structure are done. * * It's OK to call this with NULL. * * @hsotg: The HCD state structure for the DWC OTG controller. * @dwc_tt: The pointer returned by dwc2_host_get_tt_info.
*/ void dwc2_host_put_tt_info(struct dwc2_hsotg *hsotg, struct dwc2_tt *dwc_tt)
{ /* Model kfree and make put of NULL a no-op */ if (!dwc_tt) return;
WARN_ON(dwc_tt->refcount < 1);
dwc_tt->refcount--; if (!dwc_tt->refcount) {
dwc_tt->usb_tt->hcpriv = NULL;
kfree(dwc_tt);
}
}
if (urb->interval)
bus->bandwidth_allocated -= bw / urb->interval; if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
bus->bandwidth_isoc_reqs--; else
bus->bandwidth_int_reqs--;
}
/* * Sets the final status of an URB and returns it to the upper layer. Any * required cleanup of the URB is performed. * * Must be called with interrupt disabled and spinlock held
*/ void dwc2_host_complete(struct dwc2_hsotg *hsotg, struct dwc2_qtd *qtd, int status)
{ struct urb *urb; int i;
if (!qtd) {
dev_dbg(hsotg->dev, "## %s: qtd is NULL ##\n", __func__); return;
}
if (!qtd->urb) {
dev_dbg(hsotg->dev, "## %s: qtd->urb is NULL ##\n", __func__); return;
}
urb = qtd->urb->priv; if (!urb) {
dev_dbg(hsotg->dev, "## %s: urb->priv is NULL ##\n", __func__); return;
}
if (dbg_urb(urb))
dev_vdbg(hsotg->dev, "%s: urb %p device %d ep %d-%s status %d actual %d\n",
__func__, urb, usb_pipedevice(urb->pipe),
usb_pipeendpoint(urb->pipe),
usb_pipein(urb->pipe) ? "IN" : "OUT", status,
urb->actual_length);
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { if (!hsotg->params.dma_desc_enable)
urb->start_frame = qtd->qh->start_active_frame;
urb->error_count = dwc2_hcd_urb_get_error_count(qtd->urb); for (i = 0; i < urb->number_of_packets; ++i) {
urb->iso_frame_desc[i].actual_length =
dwc2_hcd_urb_get_iso_desc_actual_length(
qtd->urb, i);
urb->iso_frame_desc[i].status =
dwc2_hcd_urb_get_iso_desc_status(qtd->urb, i);
}
}
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS && dbg_perio()) { for (i = 0; i < urb->number_of_packets; i++)
dev_vdbg(hsotg->dev, " ISO Desc %d status %d\n",
i, urb->iso_frame_desc[i].status);
}
urb->status = status; if (!status) { if ((urb->transfer_flags & URB_SHORT_NOT_OK) &&
urb->actual_length < urb->transfer_buffer_length)
urb->status = -EREMOTEIO;
}
/* * Work queue function for starting the HCD when A-Cable is connected
*/ staticvoid dwc2_hcd_start_func(struct work_struct *work)
{ struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
start_work.work);
ret = phy_reset(hsotg->phy); if (ret)
dev_warn(hsotg->dev, "PHY reset failed\n");
}
/* * ========================================================================= * Linux HC Driver Functions * =========================================================================
*/
/* * Initializes the DWC_otg controller and its root hub and prepares it for host * mode operation. Activates the root port. Returns 0 on success and a negative * error code on failure.
*/ staticint _dwc2_hcd_start(struct usb_hcd *hcd)
{ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); struct usb_bus *bus = hcd_to_bus(hcd); unsignedlong flags;
u32 hprt0; int ret;
hprt0 = dwc2_read_hprt0(hsotg); /* Has vbus power been turned on in dwc2_core_host_init ? */ if (hprt0 & HPRT0_PWR) { /* Enable external vbus supply before resuming root hub */
spin_unlock_irqrestore(&hsotg->lock, flags);
ret = dwc2_vbus_supply_init(hsotg); if (ret) return ret;
spin_lock_irqsave(&hsotg->lock, flags);
}
/* Initialize and connect root hub if one is not already attached */ if (bus->root_hub) {
dev_dbg(hsotg->dev, "DWC OTG HCD Has Root Hub\n"); /* Inform the HUB driver to resume */
usb_hcd_resume_root_hub(hcd);
}
spin_unlock_irqrestore(&hsotg->lock, flags);
return 0;
}
/* * Halts the DWC_otg host mode operations in a clean manner. USB transfers are * stopped.
*/ staticvoid _dwc2_hcd_stop(struct usb_hcd *hcd)
{ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); unsignedlong flags;
u32 hprt0;
/* Turn off all host-specific interrupts */
dwc2_disable_host_interrupts(hsotg);
/* Wait for interrupt processing to finish */
synchronize_irq(hcd->irq);
/* keep balanced supply init/exit by checking HPRT0_PWR */ if (hprt0 & HPRT0_PWR)
dwc2_vbus_supply_exit(hsotg);
usleep_range(1000, 3000);
}
staticint _dwc2_hcd_suspend(struct usb_hcd *hcd)
{ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); unsignedlong flags; int ret = 0;
spin_lock_irqsave(&hsotg->lock, flags);
if (dwc2_is_device_mode(hsotg)) goto unlock;
if (hsotg->lx_state != DWC2_L0) goto unlock;
if (!HCD_HW_ACCESSIBLE(hcd)) goto unlock;
if (hsotg->op_state == OTG_STATE_B_PERIPHERAL) goto unlock;
if (hsotg->bus_suspended) goto skip_power_saving;
if (!(dwc2_read_hprt0(hsotg) & HPRT0_CONNSTS)) goto skip_power_saving;
switch (hsotg->params.power_down) { case DWC2_POWER_DOWN_PARAM_PARTIAL: /* Enter partial_power_down */
ret = dwc2_enter_partial_power_down(hsotg); if (ret)
dev_err(hsotg->dev, "enter partial_power_down failed\n"); /* After entering suspend, hardware is not accessible */
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); break; case DWC2_POWER_DOWN_PARAM_HIBERNATION: /* Enter hibernation */
spin_unlock_irqrestore(&hsotg->lock, flags);
ret = dwc2_enter_hibernation(hsotg, 1); if (ret)
dev_err(hsotg->dev, "enter hibernation failed\n");
spin_lock_irqsave(&hsotg->lock, flags);
/* After entering suspend, hardware is not accessible */
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); break; case DWC2_POWER_DOWN_PARAM_NONE: /* * If not hibernation nor partial power down are supported, * clock gating is used to save power.
*/ if (!hsotg->params.no_clock_gating) {
dwc2_host_enter_clock_gating(hsotg);
/* After entering suspend, hardware is not accessible */
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
} break; default: goto skip_power_saving;
}
staticint _dwc2_hcd_resume(struct usb_hcd *hcd)
{ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); unsignedlong flags;
u32 hprt0; int ret = 0;
spin_lock_irqsave(&hsotg->lock, flags);
if (dwc2_is_device_mode(hsotg)) goto unlock;
if (hsotg->lx_state != DWC2_L2) goto unlock;
hprt0 = dwc2_read_hprt0(hsotg);
/* * Added port connection status checking which prevents exiting from * Partial Power Down mode from _dwc2_hcd_resume() if not in Partial * Power Down mode.
*/ if (hprt0 & HPRT0_CONNSTS) {
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
hsotg->lx_state = DWC2_L0; goto unlock;
}
switch (hsotg->params.power_down) { case DWC2_POWER_DOWN_PARAM_PARTIAL:
ret = dwc2_exit_partial_power_down(hsotg, 0, true); if (ret)
dev_err(hsotg->dev, "exit partial_power_down failed\n"); /* * Set HW accessible bit before powering on the controller * since an interrupt may rise.
*/
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); break; case DWC2_POWER_DOWN_PARAM_HIBERNATION:
ret = dwc2_exit_hibernation(hsotg, 0, 0, 1); if (ret)
dev_err(hsotg->dev, "exit hibernation failed.\n");
/* * Set HW accessible bit before powering on the controller * since an interrupt may rise.
*/
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); break; case DWC2_POWER_DOWN_PARAM_NONE: /* * If not hibernation nor partial power down are supported, * port resume is done using the clock gating programming flow.
*/
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_host_exit_clock_gating(hsotg, 0);
/* * Initialize the Core for Host mode, as after system resume * the global interrupts are disabled.
*/
dwc2_core_init(hsotg, false);
dwc2_enable_global_interrupts(hsotg);
dwc2_hcd_reinit(hsotg);
spin_lock_irqsave(&hsotg->lock, flags);
/* * Set HW accessible bit before powering on the controller * since an interrupt may rise.
*/
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); break; default:
hsotg->lx_state = DWC2_L0; goto unlock;
}
/* Change Root port status, as port status change occurred after resume.*/
hsotg->flags.b.port_suspend_change = 1;
/* * Enable power if not already done. * This must not be spinlocked since duration * of this call is unknown.
*/ if (!IS_ERR_OR_NULL(hsotg->uphy)) {
spin_unlock_irqrestore(&hsotg->lock, flags);
usb_phy_set_suspend(hsotg->uphy, false);
spin_lock_irqsave(&hsotg->lock, flags);
}
/* Enable external vbus supply after resuming the port. */
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_vbus_supply_init(hsotg);
/* Wait for controller to correctly update D+/D- level */
usleep_range(3000, 5000);
spin_lock_irqsave(&hsotg->lock, flags);
/* * Clear Port Enable and Port Status changes. * Enable Port Power.
*/
dwc2_writel(hsotg, HPRT0_PWR | HPRT0_CONNDET |
HPRT0_ENACHG, HPRT0);
/* Wait for controller to detect Port Connect */
spin_unlock_irqrestore(&hsotg->lock, flags);
usleep_range(5000, 7000);
spin_lock_irqsave(&hsotg->lock, flags);
unlock:
spin_unlock_irqrestore(&hsotg->lock, flags);
return ret;
}
/* Returns the current frame number */ staticint _dwc2_hcd_get_frame_number(struct usb_hcd *hcd)
{ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
if (hcd_uses_dma(hcd)) { if (!buf && (urb->transfer_dma & 3)) {
dev_err(hsotg->dev, "%s: unaligned transfer with no transfer_buffer",
__func__);
retval = -EINVAL; goto fail0;
}
}
if (!(urb->transfer_flags & URB_NO_INTERRUPT))
tflags |= URB_GIVEBACK_ASAP; if (urb->transfer_flags & URB_ZERO_PACKET)
tflags |= URB_SEND_ZERO_PACKET;
for (i = 0; i < urb->number_of_packets; ++i)
dwc2_hcd_urb_set_iso_desc_params(dwc2_urb, i,
urb->iso_frame_desc[i].offset,
urb->iso_frame_desc[i].length);
urb->hcpriv = dwc2_urb;
qh = (struct dwc2_qh *)ep->hcpriv; /* Create QH for the endpoint if it doesn't exist */ if (!qh) {
qh = dwc2_hcd_qh_create(hsotg, dwc2_urb, mem_flags); if (!qh) {
retval = -ENOMEM; goto fail0;
}
ep->hcpriv = qh;
qh_allocated = true;
}
/* * Frees resources in the DWC_otg controller related to a given endpoint. Also * clears state in the HCD related to the endpoint. Any URBs for the endpoint * must already be dequeued.
*/ staticvoid _dwc2_hcd_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
{ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
/* * Resets endpoint specific parameter values, in current version used to reset * the data toggle (as a WA). This function can be called from usb_clear_halt * routine.
*/ staticvoid _dwc2_hcd_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
{ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); unsignedlong flags;
dev_dbg(hsotg->dev, "DWC OTG HCD EP RESET: bEndpointAddress=0x%02x\n",
ep->desc.bEndpointAddress);
/* * Handles host mode interrupts for the DWC_otg controller. Returns IRQ_NONE if * there was no interrupt to handle. Returns IRQ_HANDLED if there was a valid * interrupt. * * This function is called by the USB core when an interrupt occurs
*/ static irqreturn_t _dwc2_hcd_irq(struct usb_hcd *hcd)
{ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
return dwc2_handle_hcd_intr(hsotg);
}
/* * Creates Status Change bitmap for the root hub and root port. The bitmap is * returned in buf. Bit 0 is the status change indicator for the root hub. Bit 1 * is the status change indicator for the single root port. Returns 1 if either * change indicator is 1, otherwise returns 0.
*/ staticint _dwc2_hcd_hub_status_data(struct usb_hcd *hcd, char *buf)
{ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
/* * Frees secondary storage associated with the dwc2_hsotg structure contained * in the struct usb_hcd field
*/ staticvoid dwc2_hcd_free(struct dwc2_hsotg *hsotg)
{
u32 ahbcfg;
u32 dctl; int i;
if (hsotg->wq_otg) { if (!cancel_work_sync(&hsotg->wf_otg))
flush_workqueue(hsotg->wq_otg);
destroy_workqueue(hsotg->wq_otg);
}
cancel_work_sync(&hsotg->phy_reset_work);
timer_delete(&hsotg->wkp_timer);
}
staticvoid dwc2_hcd_release(struct dwc2_hsotg *hsotg)
{ /* Turn off all host-specific interrupts */
dwc2_disable_host_interrupts(hsotg);
dwc2_hcd_free(hsotg);
}
/* * Initializes the HCD. This function allocates memory for and initializes the * static parts of the usb_hcd and dwc2_hsotg structures. It also registers the * USB bus with the core and calls the hc_driver->start() function. It returns * a negative error on failure.
*/ int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
{ struct platform_device *pdev = to_platform_device(hsotg->dev); struct resource *res; struct usb_hcd *hcd; struct dwc2_host_chan *channel;
u32 hcfg; int i, num_channels; int retval;
/* Check if the bus driver or platform code has setup a dma_mask */ if (hsotg->params.host_dma &&
!hsotg->dev->dma_mask) {
dev_warn(hsotg->dev, "dma_mask not set, disabling DMA\n");
hsotg->params.host_dma = false;
hsotg->params.dma_desc_enable = false;
}
/* Set device flags indicating whether the HCD supports DMA */ if (hsotg->params.host_dma) { if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
dev_warn(hsotg->dev, "can't set DMA mask\n"); if (dma_set_coherent_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
dev_warn(hsotg->dev, "can't set coherent DMA mask\n");
}
if (hsotg->params.change_speed_quirk) {
dwc2_hc_driver.free_dev = dwc2_free_dev;
dwc2_hc_driver.reset_device = dwc2_reset_device;
}
if (hsotg->params.host_dma)
dwc2_hc_driver.flags |= HCD_DMA;
hcd = usb_create_hcd(&dwc2_hc_driver, hsotg->dev, dev_name(hsotg->dev)); if (!hcd) goto error1;
hcd->has_tt = 1;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) {
retval = -EINVAL; goto error2;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
/* Initialize the non-periodic schedule */
INIT_LIST_HEAD(&hsotg->non_periodic_sched_inactive);
INIT_LIST_HEAD(&hsotg->non_periodic_sched_waiting);
INIT_LIST_HEAD(&hsotg->non_periodic_sched_active);
/* Initialize the periodic schedule */
INIT_LIST_HEAD(&hsotg->periodic_sched_inactive);
INIT_LIST_HEAD(&hsotg->periodic_sched_ready);
INIT_LIST_HEAD(&hsotg->periodic_sched_assigned);
INIT_LIST_HEAD(&hsotg->periodic_sched_queued);
INIT_LIST_HEAD(&hsotg->split_order);
/* * Create a host channel descriptor for each host channel implemented * in the controller. Initialize the channel descriptor array.
*/
INIT_LIST_HEAD(&hsotg->free_hc_list);
num_channels = hsotg->params.host_channels;
memset(&hsotg->hc_ptr_array[0], 0, sizeof(hsotg->hc_ptr_array));
for (i = 0; i < num_channels; i++) {
channel = kzalloc(sizeof(*channel), GFP_KERNEL); if (!channel) goto error3;
channel->hc_num = i;
INIT_LIST_HEAD(&channel->split_order_list_entry);
hsotg->hc_ptr_array[i] = channel;
}
/* Initialize work */
INIT_DELAYED_WORK(&hsotg->start_work, dwc2_hcd_start_func);
INIT_DELAYED_WORK(&hsotg->reset_work, dwc2_hcd_reset_func);
INIT_WORK(&hsotg->phy_reset_work, dwc2_hcd_phy_reset_func);
/* * Allocate space for storing data on status transactions. Normally no * data is sent, but this space acts as a bit bucket. This must be * done after usb_add_hcd since that function allocates the DMA buffer * pool.
*/ if (hsotg->params.host_dma)
hsotg->status_buf = dma_alloc_coherent(hsotg->dev,
DWC2_HCD_STATUS_BUF_SIZE,
&hsotg->status_buf_dma, GFP_KERNEL); else
hsotg->status_buf = kzalloc(DWC2_HCD_STATUS_BUF_SIZE,
GFP_KERNEL);
if (!hsotg->status_buf) goto error3;
/* * Create kmem caches to handle descriptor buffers in descriptor * DMA mode. * Alignment must be set to 512 bytes.
*/ if (hsotg->params.dma_desc_enable ||
hsotg->params.dma_desc_fs_enable) {
hsotg->desc_gen_cache = kmem_cache_create("dwc2-gen-desc", sizeof(struct dwc2_dma_desc) *
MAX_DMA_DESC_NUM_GENERIC, 512, SLAB_CACHE_DMA,
NULL); if (!hsotg->desc_gen_cache) {
dev_err(hsotg->dev, "unable to create dwc2 generic desc cache\n");
/* * Disable descriptor dma mode since it will not be * usable.
*/
hsotg->params.dma_desc_enable = false;
hsotg->params.dma_desc_fs_enable = false;
}
/* * Disable descriptor dma mode since it will not be * usable.
*/
hsotg->params.dma_desc_enable = false;
hsotg->params.dma_desc_fs_enable = false;
}
}
if (hsotg->params.host_dma) { /* * Create kmem caches to handle non-aligned buffer * in Buffer DMA mode.
*/
hsotg->unaligned_cache = kmem_cache_create("dwc2-unaligned-dma",
DWC2_KMEM_UNALIGNED_BUF_SIZE, 4,
SLAB_CACHE_DMA, NULL); if (!hsotg->unaligned_cache)
dev_err(hsotg->dev, "unable to create dwc2 unaligned cache\n");
}
if (!IS_ERR_OR_NULL(hsotg->uphy))
otg_set_host(hsotg->uphy->otg, &hcd->self);
/* * Finish generic HCD initialization and start the HCD. This function * allocates the DMA buffer pool, registers the USB bus, requests the * IRQ line, and calls hcd_start method.
*/
retval = usb_add_hcd(hcd, hsotg->irq, IRQF_SHARED); if (retval < 0) goto error4;
/* * Removes the HCD. * Frees memory and resources associated with the HCD and deregisters the bus.
*/ void dwc2_hcd_remove(struct dwc2_hsotg *hsotg)
{ struct usb_hcd *hcd;
/** * dwc2_backup_host_registers() - Backup controller host registers. * When suspending usb bus, registers needs to be backuped * if controller power is disabled once suspended. * * @hsotg: Programming view of the DWC_otg controller
*/ int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg)
{ struct dwc2_hregs_backup *hr; int i;
/** * dwc2_restore_host_registers() - Restore controller host registers. * When resuming usb bus, device registers needs to be restored * if controller power were disabled. * * @hsotg: Programming view of the DWC_otg controller
*/ int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg)
{ struct dwc2_hregs_backup *hr; int i;
dev_dbg(hsotg->dev, "%s\n", __func__);
/* Restore host regs */
hr = &hsotg->hr_backup; if (!hr->valid) {
dev_err(hsotg->dev, "%s: no host registers to restore\n",
__func__); return -EINVAL;
}
hr->valid = false;
int dwc2_host_backup_critical_registers(struct dwc2_hsotg *hsotg)
{ int ret;
/* Backup all registers */
ret = dwc2_backup_global_registers(hsotg); if (ret) {
dev_err(hsotg->dev, "%s: failed to backup global registers\n",
__func__); return ret;
}
ret = dwc2_backup_host_registers(hsotg); if (ret) {
dev_err(hsotg->dev, "%s: failed to backup host registers\n",
__func__); return ret;
}
return 0;
}
int dwc2_host_restore_critical_registers(struct dwc2_hsotg *hsotg)
{ int ret;
ret = dwc2_restore_global_registers(hsotg); if (ret) {
dev_err(hsotg->dev, "%s: failed to restore registers\n",
__func__); return ret;
}
ret = dwc2_restore_host_registers(hsotg); if (ret) {
dev_err(hsotg->dev, "%s: failed to restore host registers\n",
__func__); return ret;
}
return 0;
}
/** * dwc2_host_enter_hibernation() - Put controller in Hibernation. * * @hsotg: Programming view of the DWC_otg controller
*/ int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg)
{ unsignedlong flags; int ret = 0;
u32 hprt0;
u32 pcgcctl;
u32 gusbcfg;
u32 gpwrdn;
dev_dbg(hsotg->dev, "Preparing host for hibernation\n");
ret = dwc2_host_backup_critical_registers(hsotg); if (ret) return ret;
/* Enter USB Suspend Mode */
hprt0 = dwc2_readl(hsotg, HPRT0);
hprt0 |= HPRT0_SUSP;
hprt0 &= ~HPRT0_ENA;
dwc2_writel(hsotg, hprt0, HPRT0);
/* Wait for the HPRT0.PrtSusp register field to be set */ if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 5000))
dev_warn(hsotg->dev, "Suspend wasn't generated\n");
/* * We need to disable interrupts to prevent servicing of any IRQ * during going to hibernation
*/
spin_lock_irqsave(&hsotg->lock, flags);
hsotg->lx_state = DWC2_L2;
/* * dwc2_host_exit_hibernation() * * @hsotg: Programming view of the DWC_otg controller * @rem_wakeup: indicates whether resume is initiated by Device or Host. * @param reset: indicates whether resume is initiated by Reset. * * Return: non-zero if failed to enter to hibernation. * * This function is for exiting from Host mode hibernation by * Host Initiated Resume/Reset and Device Initiated Remote-Wakeup.
*/ int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup, int reset)
{
u32 gpwrdn;
u32 hprt0; int ret = 0; struct dwc2_gregs_backup *gr; struct dwc2_hregs_backup *hr;
gr = &hsotg->gr_backup;
hr = &hsotg->hr_backup;
dev_dbg(hsotg->dev, "%s: called with rem_wakeup = %d reset = %d\n",
__func__, rem_wakeup, reset);
/* * This step is not described in functional spec but if not wait for * this delay, mismatch interrupts occurred because just after restore * core is in Device mode(gintsts.curmode == 0)
*/
mdelay(100);
/* Clear all pending interupts */
dwc2_writel(hsotg, 0xffffffff, GINTSTS);
if (reset) {
hprt0 |= HPRT0_RST;
dwc2_writel(hsotg, hprt0, HPRT0);
/* Wait for Resume time and then program HPRT again */
mdelay(60);
hprt0 &= ~HPRT0_RST;
dwc2_writel(hsotg, hprt0, HPRT0);
} else {
hprt0 |= HPRT0_RES;
dwc2_writel(hsotg, hprt0, HPRT0);
/* De-assert Wakeup Logic */ if ((rem_wakeup && hsotg->hw_params.snpsid >= DWC2_CORE_REV_4_30a)) {
gpwrdn = dwc2_readl(hsotg, GPWRDN);
gpwrdn &= ~GPWRDN_PMUACTV;
dwc2_writel(hsotg, gpwrdn, GPWRDN);
udelay(10);
} /* Wait for Resume time and then program HPRT again */
mdelay(100);
hprt0 &= ~HPRT0_RES;
dwc2_writel(hsotg, hprt0, HPRT0);
} /* Clear all interrupt status */
hprt0 = dwc2_readl(hsotg, HPRT0);
hprt0 |= HPRT0_CONNDET;
hprt0 |= HPRT0_ENACHG;
hprt0 &= ~HPRT0_ENA;
dwc2_writel(hsotg, hprt0, HPRT0);
hprt0 = dwc2_readl(hsotg, HPRT0);
/* Clear all pending interupts */
dwc2_writel(hsotg, 0xffffffff, GINTSTS);
/* Restore global registers */
ret = dwc2_host_restore_critical_registers(hsotg); if (ret) return ret;
if (rem_wakeup) {
dwc2_hcd_rem_wakeup(hsotg); /* * Change "port_connect_status_change" flag to re-enumerate, * because after exit from hibernation port connection status * is not detected.
*/
hsotg->flags.b.port_connect_status_change = 1;
}
/* If the controller isn't allowed to wakeup then we can power off. */ if (!device_may_wakeup(dwc2->dev)) returntrue;
/* * We don't want to power off the PHY if something under the * root hub has wakeup enabled.
*/ if (usb_wakeup_enabled_descendants(root_hub)) returnfalse;
/* No reason to keep the PHY powered, so allow poweroff */ returntrue;
}
/** * dwc2_host_enter_partial_power_down() - Put controller in partial * power down. * * @hsotg: Programming view of the DWC_otg controller * * Return: non-zero if failed to enter host partial power down. * * This function is for entering Host mode partial power down.
*/ int dwc2_host_enter_partial_power_down(struct dwc2_hsotg *hsotg)
{
u32 pcgcctl;
u32 hprt0; int ret = 0;
dev_dbg(hsotg->dev, "Entering host partial power down started.\n");
/* Put this port in suspend mode. */
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 |= HPRT0_SUSP;
dwc2_writel(hsotg, hprt0, HPRT0);
udelay(5);
/* Wait for the HPRT0.PrtSusp register field to be set */ if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000))
dev_warn(hsotg->dev, "Suspend wasn't generated\n");
/* Backup all registers */
ret = dwc2_host_backup_critical_registers(hsotg); if (ret) return ret;
/* * Clear any pending interrupts since dwc2 will not be able to * clear them after entering partial_power_down.
*/
dwc2_writel(hsotg, 0xffffffff, GINTSTS);
/* Put the controller in low power state */
pcgcctl = dwc2_readl(hsotg, PCGCTL);
/* Set in_ppd flag to 1 as here core enters suspend. */
hsotg->in_ppd = 1;
hsotg->lx_state = DWC2_L2;
hsotg->bus_suspended = true;
dev_dbg(hsotg->dev, "Entering host partial power down completed.\n");
return ret;
}
/* * dwc2_host_exit_partial_power_down() - Exit controller from host partial * power down. * * @hsotg: Programming view of the DWC_otg controller * @rem_wakeup: indicates whether resume is initiated by Reset. * @restore: indicates whether need to restore the registers or not. * * Return: non-zero if failed to exit host partial power down. * * This function is for exiting from Host mode partial power down.
*/ int dwc2_host_exit_partial_power_down(struct dwc2_hsotg *hsotg, int rem_wakeup, bool restore)
{
u32 pcgcctl; int ret = 0;
u32 hprt0;
dev_dbg(hsotg->dev, "Exiting host partial power down started.\n");
/* Set lx_state to and in_ppd to 0 as here core exits from suspend. */
hsotg->in_ppd = 0;
hsotg->lx_state = DWC2_L0;
dev_dbg(hsotg->dev, "Exiting host partial power down completed.\n"); return ret;
}
/** * dwc2_host_enter_clock_gating() - Put controller in clock gating. * * @hsotg: Programming view of the DWC_otg controller * * This function is for entering Host mode clock gating.
*/ void dwc2_host_enter_clock_gating(struct dwc2_hsotg *hsotg)
{
u32 hprt0;
u32 pcgctl;
/* Put this port in suspend mode. */
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 |= HPRT0_SUSP;
dwc2_writel(hsotg, hprt0, HPRT0);
/* Set the Phy Clock bit as suspend is received. */
pcgctl = dwc2_readl(hsotg, PCGCTL);
pcgctl |= PCGCTL_STOPPCLK;
dwc2_writel(hsotg, pcgctl, PCGCTL);
udelay(5);
/* Set the Gate hclk as suspend is received. */
pcgctl = dwc2_readl(hsotg, PCGCTL);
pcgctl |= PCGCTL_GATEHCLK;
dwc2_writel(hsotg, pcgctl, PCGCTL);
udelay(5);
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