/* * This file contains the structures, constants, and interfaces for the * Host Contoller Driver (HCD) * * The Host Controller Driver (HCD) is responsible for translating requests * from the USB Driver into the appropriate actions on the DWC_otg controller. * It isolates the USBD from the specifics of the controller by providing an * API to the USBD.
*/
struct dwc2_qh;
/** * struct dwc2_host_chan - Software host channel descriptor * * @hc_num: Host channel number, used for register address lookup * @dev_addr: Address of the device * @ep_num: Endpoint of the device * @ep_is_in: Endpoint direction * @speed: Device speed. One of the following values: * - USB_SPEED_LOW * - USB_SPEED_FULL * - USB_SPEED_HIGH * @ep_type: Endpoint type. One of the following values: * - USB_ENDPOINT_XFER_CONTROL: 0 * - USB_ENDPOINT_XFER_ISOC: 1 * - USB_ENDPOINT_XFER_BULK: 2 * - USB_ENDPOINT_XFER_INTR: 3 * @max_packet: Max packet size in bytes * @data_pid_start: PID for initial transaction. * 0: DATA0 * 1: DATA2 * 2: DATA1 * 3: MDATA (non-Control EP), * SETUP (Control EP) * @multi_count: Number of additional periodic transactions per * (micro)frame * @xfer_buf: Pointer to current transfer buffer position * @xfer_dma: DMA address of xfer_buf * @align_buf: In Buffer DMA mode this will be used if xfer_buf is not * DWORD aligned * @xfer_len: Total number of bytes to transfer * @xfer_count: Number of bytes transferred so far * @start_pkt_count: Packet count at start of transfer * @xfer_started: True if the transfer has been started * @do_ping: True if a PING request should be issued on this channel * @error_state: True if the error count for this transaction is non-zero * @halt_on_queue: True if this channel should be halted the next time a * request is queued for the channel. This is necessary in * slave mode if no request queue space is available when * an attempt is made to halt the channel. * @halt_pending: True if the host channel has been halted, but the core * is not finished flushing queued requests * @do_split: Enable split for the channel * @complete_split: Enable complete split * @hub_addr: Address of high speed hub for the split * @hub_port: Port of the low/full speed device for the split * @xact_pos: Split transaction position. One of the following values: * - DWC2_HCSPLT_XACTPOS_MID * - DWC2_HCSPLT_XACTPOS_BEGIN * - DWC2_HCSPLT_XACTPOS_END * - DWC2_HCSPLT_XACTPOS_ALL * @requests: Number of requests issued for this channel since it was * assigned to the current transfer (not counting PINGs) * @schinfo: Scheduling micro-frame bitmap * @ntd: Number of transfer descriptors for the transfer * @halt_status: Reason for halting the host channel * @hcint: Contents of the HCINT register when the interrupt came * @qh: QH for the transfer being processed by this channel * @hc_list_entry: For linking to list of host channels * @desc_list_addr: Current QH's descriptor list DMA address * @desc_list_sz: Current QH's descriptor list size * @split_order_list_entry: List entry for keeping track of the order of splits * * This structure represents the state of a single host channel when acting in * host mode. It contains the data items needed to transfer packets to an * endpoint via a host channel.
*/ struct dwc2_host_chan {
u8 hc_num;
/* The number of elements per LS bitmap (per port on multi_tt) */ #define DWC2_ELEMENTS_PER_LS_BITMAP DIV_ROUND_UP(DWC2_LS_SCHEDULE_SLICES, \
BITS_PER_LONG)
/** * struct dwc2_tt - dwc2 data associated with a usb_tt * * @refcount: Number of Queue Heads (QHs) holding a reference. * @usb_tt: Pointer back to the official usb_tt. * @periodic_bitmaps: Bitmap for which parts of the 1ms frame are accounted * for already. Each is DWC2_ELEMENTS_PER_LS_BITMAP * elements (so sizeof(long) times that in bytes). * * This structure is stored in the hcpriv of the official usb_tt.
*/ struct dwc2_tt { int refcount; struct usb_tt *usb_tt; unsignedlong periodic_bitmaps[];
};
/** * struct dwc2_hs_transfer_time - Info about a transfer on the high speed bus. * * @start_schedule_us: The start time on the main bus schedule. Note that * the main bus schedule is tightly packed and this * time should be interpreted as tightly packed (so * uFrame 0 starts at 0 us, uFrame 1 starts at 100 us * instead of 125 us). * @duration_us: How long this transfer goes.
*/
/** * struct dwc2_qh - Software queue head structure * * @hsotg: The HCD state structure for the DWC OTG controller * @ep_type: Endpoint type. One of the following values: * - USB_ENDPOINT_XFER_CONTROL * - USB_ENDPOINT_XFER_BULK * - USB_ENDPOINT_XFER_INT * - USB_ENDPOINT_XFER_ISOC * @ep_is_in: Endpoint direction * @maxp: Value from wMaxPacketSize field of Endpoint Descriptor * @maxp_mult: Multiplier for maxp * @dev_speed: Device speed. One of the following values: * - USB_SPEED_LOW * - USB_SPEED_FULL * - USB_SPEED_HIGH * @data_toggle: Determines the PID of the next data packet for * non-controltransfers. Ignored for control transfers. * One of the following values: * - DWC2_HC_PID_DATA0 * - DWC2_HC_PID_DATA1 * @ping_state: Ping state * @do_split: Full/low speed endpoint on high-speed hub requires split * @td_first: Index of first activated isochronous transfer descriptor * @td_last: Index of last activated isochronous transfer descriptor * @host_us: Bandwidth in microseconds per transfer as seen by host * @device_us: Bandwidth in microseconds per transfer as seen by device * @host_interval: Interval between transfers as seen by the host. If * the host is high speed and the device is low speed this * will be 8 times device interval. * @device_interval: Interval between transfers as seen by the device. * interval. * @next_active_frame: (Micro)frame _before_ we next need to put something on * the bus. We'll move the qh to active here. If the * host is in high speed mode this will be a uframe. If * the host is in low speed mode this will be a full frame. * @start_active_frame: If we are partway through a split transfer, this will be * what next_active_frame was when we started. Otherwise * it should always be the same as next_active_frame. * @num_hs_transfers: Number of transfers in hs_transfers. * Normally this is 1 but can be more than one for splits. * Always >= 1 unless the host is in low/full speed mode. * @hs_transfers: Transfers that are scheduled as seen by the high speed * bus. Not used if host is in low or full speed mode (but * note that it IS USED if the device is low or full speed * as long as the HOST is in high speed mode). * @ls_start_schedule_slice: Start time (in slices) on the low speed bus * schedule that's being used by this device. This * will be on the periodic_bitmap in a * "struct dwc2_tt". Not used if this device is high * speed. Note that this is in "schedule slice" which * is tightly packed. * @ntd: Actual number of transfer descriptors in a list * @dw_align_buf: Used instead of original buffer if its physical address * is not dword-aligned * @dw_align_buf_dma: DMA address for dw_align_buf * @qtd_list: List of QTDs for this QH * @channel: Host channel currently processing transfers for this QH * @qh_list_entry: Entry for QH in either the periodic or non-periodic * schedule * @desc_list: List of transfer descriptors * @desc_list_dma: Physical address of desc_list * @desc_list_sz: Size of descriptors list * @n_bytes: Xfer Bytes array. Each element corresponds to a transfer * descriptor and indicates original XferSize value for the * descriptor * @unreserve_timer: Timer for releasing periodic reservation. * @wait_timer: Timer used to wait before re-queuing. * @dwc_tt: Pointer to our tt info (or NULL if no tt). * @ttport: Port number within our tt. * @tt_buffer_dirty True if clear_tt_buffer_complete is pending * @unreserve_pending: True if we planned to unreserve but haven't yet. * @schedule_low_speed: True if we have a low/full speed component (either the * host is in low/full speed mode or do_split). * @want_wait: We should wait before re-queuing; only matters for non- * periodic transfers and is ignored for periodic ones. * @wait_timer_cancel: Set to true to cancel the wait_timer. * * @tt_buffer_dirty: True if EP's TT buffer is not clean. * A Queue Head (QH) holds the static characteristics of an endpoint and * maintains a list of transfers (QTDs) for that endpoint. A QH structure may * be entered in either the non-periodic or periodic schedule.
*/ struct dwc2_qh { struct dwc2_hsotg *hsotg;
u8 ep_type;
u8 ep_is_in;
u16 maxp;
u16 maxp_mult;
u8 dev_speed;
u8 data_toggle;
u8 ping_state;
u8 do_split;
u8 td_first;
u8 td_last;
u16 host_us;
u16 device_us;
u16 host_interval;
u16 device_interval;
u16 next_active_frame;
u16 start_active_frame;
s16 num_hs_transfers; struct dwc2_hs_transfer_time hs_transfers[DWC2_HS_SCHEDULE_UFRAMES];
u32 ls_start_schedule_slice;
u16 ntd;
u8 *dw_align_buf;
dma_addr_t dw_align_buf_dma; struct list_head qtd_list; struct dwc2_host_chan *channel; struct list_head qh_list_entry; struct dwc2_dma_desc *desc_list;
dma_addr_t desc_list_dma;
u32 desc_list_sz;
u32 *n_bytes; struct timer_list unreserve_timer; struct hrtimer wait_timer; struct dwc2_tt *dwc_tt; int ttport; unsigned tt_buffer_dirty:1; unsigned unreserve_pending:1; unsigned schedule_low_speed:1; unsigned want_wait:1; unsigned wait_timer_cancel:1;
};
/** * struct dwc2_qtd - Software queue transfer descriptor (QTD) * * @control_phase: Current phase for control transfers (Setup, Data, or * Status) * @in_process: Indicates if this QTD is currently processed by HW * @data_toggle: Determines the PID of the next data packet for the * data phase of control transfers. Ignored for other * transfer types. One of the following values: * - DWC2_HC_PID_DATA0 * - DWC2_HC_PID_DATA1 * @complete_split: Keeps track of the current split type for FS/LS * endpoints on a HS Hub * @isoc_split_pos: Position of the ISOC split in full/low speed * @isoc_frame_index: Index of the next frame descriptor for an isochronous * transfer. A frame descriptor describes the buffer * position and length of the data to be transferred in the * next scheduled (micro)frame of an isochronous transfer. * It also holds status for that transaction. The frame * index starts at 0. * @isoc_split_offset: Position of the ISOC split in the buffer for the * current frame * @ssplit_out_xfer_count: How many bytes transferred during SSPLIT OUT * @error_count: Holds the number of bus errors that have occurred for * a transaction within this transfer * @n_desc: Number of DMA descriptors for this QTD * @isoc_frame_index_last: Last activated frame (packet) index, used in * descriptor DMA mode only * @num_naks: Number of NAKs received on this QTD. * @urb: URB for this transfer * @qh: Queue head for this QTD * @qtd_list_entry: For linking to the QH's list of QTDs * @isoc_td_first: Index of first activated isochronous transfer * descriptor in Descriptor DMA mode * @isoc_td_last: Index of last activated isochronous transfer * descriptor in Descriptor DMA mode * * A Queue Transfer Descriptor (QTD) holds the state of a bulk, control, * interrupt, or isochronous transfer. A single QTD is created for each URB * (of one of these types) submitted to the HCD. The transfer associated with * a QTD may require one or multiple transactions. * * A QTD is linked to a Queue Head, which is entered in either the * non-periodic or periodic schedule for execution. When a QTD is chosen for * execution, some or all of its transactions may be executed. After * execution, the state of the QTD is updated. The QTD may be retired if all * its transactions are complete or if an error occurred. Otherwise, it * remains in the schedule so more transactions can be executed later.
*/ struct dwc2_qtd { enum dwc2_control_phase control_phase;
u8 in_process;
u8 data_toggle;
u8 complete_split;
u8 isoc_split_pos;
u16 isoc_frame_index;
u16 isoc_split_offset;
u16 isoc_td_last;
u16 isoc_td_first;
u32 ssplit_out_xfer_count;
u8 error_count;
u8 n_desc;
u16 isoc_frame_index_last;
u16 num_naks; struct dwc2_hcd_urb *urb; struct dwc2_qh *qh; struct list_head qtd_list_entry;
};
/* Gets the struct usb_hcd that contains a struct dwc2_hsotg */ staticinlinestruct usb_hcd *dwc2_hsotg_to_hcd(struct dwc2_hsotg *hsotg)
{ return (struct usb_hcd *)hsotg->priv;
}
/* * Inline used to disable one channel interrupt. Channel interrupts are * disabled when the channel is halted or released by the interrupt handler. * There is no need to handle further interrupts of that type until the * channel is re-assigned. In fact, subsequent handling may cause crashes * because the channel structures are cleaned up when the channel is released.
*/ staticinlinevoid disable_hc_int(struct dwc2_hsotg *hsotg, int chnum, u32 intr)
{
u32 mask = dwc2_readl(hsotg, HCINTMSK(chnum));
/* * Reads HPRT0 in preparation to modify. It keeps the WC bits 0 so that if they * are read as 1, they won't clear when written back.
*/ staticinline u32 dwc2_read_hprt0(struct dwc2_hsotg *hsotg)
{
u32 hprt0 = dwc2_readl(hsotg, HPRT0);
/* * Returns true if frame1 index is greater than frame2 index. The comparison * is done modulo FRLISTEN_64_SIZE. This accounts for the rollover of the * frame number when the max index frame number is reached.
*/ staticinlinebool dwc2_frame_idx_num_gt(u16 fr_idx1, u16 fr_idx2)
{
u16 diff = fr_idx1 - fr_idx2;
u16 sign = diff & (FRLISTEN_64_SIZE >> 1);
return diff && !sign;
}
/* * Returns true if frame1 is less than or equal to frame2. The comparison is * done modulo HFNUM_MAX_FRNUM. This accounts for the rollover of the * frame number when the max frame number is reached.
*/ staticinlineint dwc2_frame_num_le(u16 frame1, u16 frame2)
{ return ((frame2 - frame1) & HFNUM_MAX_FRNUM) <= (HFNUM_MAX_FRNUM >> 1);
}
/* * Returns true if frame1 is greater than frame2. The comparison is done * modulo HFNUM_MAX_FRNUM. This accounts for the rollover of the frame * number when the max frame number is reached.
*/ staticinlineint dwc2_frame_num_gt(u16 frame1, u16 frame2)
{ return (frame1 != frame2) &&
((frame1 - frame2) & HFNUM_MAX_FRNUM) < (HFNUM_MAX_FRNUM >> 1);
}
/* * Increments frame by the amount specified by inc. The addition is done * modulo HFNUM_MAX_FRNUM. Returns the incremented value.
*/ staticinline u16 dwc2_frame_num_inc(u16 frame, u16 inc)
{ return (frame + inc) & HFNUM_MAX_FRNUM;
}
/** * dwc2_handle_hcd_intr() - Called on every hardware interrupt * * @hsotg: The DWC2 HCD * * Returns IRQ_HANDLED if interrupt is handled * Return IRQ_NONE if interrupt is not handled
*/
irqreturn_t dwc2_handle_hcd_intr(struct dwc2_hsotg *hsotg);
/** * dwc2_hcd_is_b_host() - Returns 1 if core currently is acting as B host, * and 0 otherwise * * @hsotg: The DWC2 HCD
*/ int dwc2_hcd_is_b_host(struct dwc2_hsotg *hsotg);
/** * dwc2_hcd_dump_state() - Dumps hsotg state * * @hsotg: The DWC2 HCD * * 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);
/* URB interface */
/* Transfer flags */ #define URB_GIVEBACK_ASAP 0x1 #define URB_SEND_ZERO_PACKET 0x2
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