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1148 lines
29 KiB
1148 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* c67x00-sched.c: Cypress C67X00 USB Host Controller Driver - TD scheduling |
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* |
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* Copyright (C) 2006-2008 Barco N.V. |
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* Derived from the Cypress cy7c67200/300 ezusb linux driver and |
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* based on multiple host controller drivers inside the linux kernel. |
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*/ |
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|
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#include <linux/kthread.h> |
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#include <linux/slab.h> |
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|
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#include "c67x00.h" |
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#include "c67x00-hcd.h" |
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|
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/* |
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* These are the stages for a control urb, they are kept |
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* in both urb->interval and td->privdata. |
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*/ |
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#define SETUP_STAGE 0 |
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#define DATA_STAGE 1 |
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#define STATUS_STAGE 2 |
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|
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/* -------------------------------------------------------------------------- */ |
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|
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/* |
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* struct c67x00_ep_data: Host endpoint data structure |
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*/ |
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struct c67x00_ep_data { |
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struct list_head queue; |
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struct list_head node; |
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struct usb_host_endpoint *hep; |
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struct usb_device *dev; |
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u16 next_frame; /* For int/isoc transactions */ |
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}; |
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|
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/* |
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* struct c67x00_td |
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* |
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* Hardware parts are little endiannes, SW in CPU endianess. |
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*/ |
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struct c67x00_td { |
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/* HW specific part */ |
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__le16 ly_base_addr; /* Bytes 0-1 */ |
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__le16 port_length; /* Bytes 2-3 */ |
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u8 pid_ep; /* Byte 4 */ |
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u8 dev_addr; /* Byte 5 */ |
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u8 ctrl_reg; /* Byte 6 */ |
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u8 status; /* Byte 7 */ |
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u8 retry_cnt; /* Byte 8 */ |
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#define TT_OFFSET 2 |
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#define TT_CONTROL 0 |
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#define TT_ISOCHRONOUS 1 |
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#define TT_BULK 2 |
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#define TT_INTERRUPT 3 |
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u8 residue; /* Byte 9 */ |
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__le16 next_td_addr; /* Bytes 10-11 */ |
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/* SW part */ |
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struct list_head td_list; |
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u16 td_addr; |
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void *data; |
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struct urb *urb; |
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unsigned long privdata; |
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|
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/* These are needed for handling the toggle bits: |
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* an urb can be dequeued while a td is in progress |
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* after checking the td, the toggle bit might need to |
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* be fixed */ |
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struct c67x00_ep_data *ep_data; |
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unsigned int pipe; |
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}; |
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|
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struct c67x00_urb_priv { |
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struct list_head hep_node; |
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struct urb *urb; |
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int port; |
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int cnt; /* packet number for isoc */ |
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int status; |
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struct c67x00_ep_data *ep_data; |
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}; |
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|
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#define td_udev(td) ((td)->ep_data->dev) |
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|
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#define CY_TD_SIZE 12 |
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|
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#define TD_PIDEP_OFFSET 0x04 |
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#define TD_PIDEPMASK_PID 0xF0 |
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#define TD_PIDEPMASK_EP 0x0F |
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#define TD_PORTLENMASK_DL 0x03FF |
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#define TD_PORTLENMASK_PN 0xC000 |
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|
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#define TD_STATUS_OFFSET 0x07 |
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#define TD_STATUSMASK_ACK 0x01 |
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#define TD_STATUSMASK_ERR 0x02 |
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#define TD_STATUSMASK_TMOUT 0x04 |
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#define TD_STATUSMASK_SEQ 0x08 |
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#define TD_STATUSMASK_SETUP 0x10 |
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#define TD_STATUSMASK_OVF 0x20 |
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#define TD_STATUSMASK_NAK 0x40 |
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#define TD_STATUSMASK_STALL 0x80 |
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#define TD_ERROR_MASK (TD_STATUSMASK_ERR | TD_STATUSMASK_TMOUT | \ |
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TD_STATUSMASK_STALL) |
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#define TD_RETRYCNT_OFFSET 0x08 |
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#define TD_RETRYCNTMASK_ACT_FLG 0x10 |
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#define TD_RETRYCNTMASK_TX_TYPE 0x0C |
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#define TD_RETRYCNTMASK_RTY_CNT 0x03 |
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#define TD_RESIDUE_OVERFLOW 0x80 |
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#define TD_PID_IN 0x90 |
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|
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/* Residue: signed 8bits, neg -> OVERFLOW, pos -> UNDERFLOW */ |
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#define td_residue(td) ((__s8)(td->residue)) |
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#define td_ly_base_addr(td) (__le16_to_cpu((td)->ly_base_addr)) |
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#define td_port_length(td) (__le16_to_cpu((td)->port_length)) |
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#define td_next_td_addr(td) (__le16_to_cpu((td)->next_td_addr)) |
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|
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#define td_active(td) ((td)->retry_cnt & TD_RETRYCNTMASK_ACT_FLG) |
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#define td_length(td) (td_port_length(td) & TD_PORTLENMASK_DL) |
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|
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#define td_sequence_ok(td) (!td->status || \ |
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(!(td->status & TD_STATUSMASK_SEQ) == \ |
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!(td->ctrl_reg & SEQ_SEL))) |
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|
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#define td_acked(td) (!td->status || \ |
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(td->status & TD_STATUSMASK_ACK)) |
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#define td_actual_bytes(td) (td_length(td) - td_residue(td)) |
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|
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/* -------------------------------------------------------------------------- */ |
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|
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/* |
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* dbg_td - Dump the contents of the TD |
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*/ |
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static void dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg) |
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{ |
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struct device *dev = c67x00_hcd_dev(c67x00); |
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|
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dev_dbg(dev, "### %s at 0x%04x\n", msg, td->td_addr); |
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dev_dbg(dev, "urb: 0x%p\n", td->urb); |
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dev_dbg(dev, "endpoint: %4d\n", usb_pipeendpoint(td->pipe)); |
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dev_dbg(dev, "pipeout: %4d\n", usb_pipeout(td->pipe)); |
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dev_dbg(dev, "ly_base_addr: 0x%04x\n", td_ly_base_addr(td)); |
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dev_dbg(dev, "port_length: 0x%04x\n", td_port_length(td)); |
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dev_dbg(dev, "pid_ep: 0x%02x\n", td->pid_ep); |
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dev_dbg(dev, "dev_addr: 0x%02x\n", td->dev_addr); |
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dev_dbg(dev, "ctrl_reg: 0x%02x\n", td->ctrl_reg); |
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dev_dbg(dev, "status: 0x%02x\n", td->status); |
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dev_dbg(dev, "retry_cnt: 0x%02x\n", td->retry_cnt); |
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dev_dbg(dev, "residue: 0x%02x\n", td->residue); |
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dev_dbg(dev, "next_td_addr: 0x%04x\n", td_next_td_addr(td)); |
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dev_dbg(dev, "data: %*ph\n", td_length(td), td->data); |
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} |
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|
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/* -------------------------------------------------------------------------- */ |
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/* Helper functions */ |
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|
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static inline u16 c67x00_get_current_frame_number(struct c67x00_hcd *c67x00) |
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{ |
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return c67x00_ll_husb_get_frame(c67x00->sie) & HOST_FRAME_MASK; |
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} |
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|
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/* |
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* frame_add |
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* Software wraparound for framenumbers. |
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*/ |
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static inline u16 frame_add(u16 a, u16 b) |
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{ |
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return (a + b) & HOST_FRAME_MASK; |
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} |
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|
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/* |
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* frame_after - is frame a after frame b |
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*/ |
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static inline int frame_after(u16 a, u16 b) |
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{ |
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return ((HOST_FRAME_MASK + a - b) & HOST_FRAME_MASK) < |
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(HOST_FRAME_MASK / 2); |
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} |
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|
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/* |
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* frame_after_eq - is frame a after or equal to frame b |
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*/ |
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static inline int frame_after_eq(u16 a, u16 b) |
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{ |
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return ((HOST_FRAME_MASK + 1 + a - b) & HOST_FRAME_MASK) < |
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(HOST_FRAME_MASK / 2); |
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} |
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|
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/* -------------------------------------------------------------------------- */ |
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|
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/* |
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* c67x00_release_urb - remove link from all tds to this urb |
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* Disconnects the urb from it's tds, so that it can be given back. |
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* pre: urb->hcpriv != NULL |
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*/ |
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static void c67x00_release_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
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{ |
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struct c67x00_td *td; |
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struct c67x00_urb_priv *urbp; |
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BUG_ON(!urb); |
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c67x00->urb_count--; |
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if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { |
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c67x00->urb_iso_count--; |
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if (c67x00->urb_iso_count == 0) |
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c67x00->max_frame_bw = MAX_FRAME_BW_STD; |
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} |
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|
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/* TODO this might be not so efficient when we've got many urbs! |
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* Alternatives: |
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* * only clear when needed |
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* * keep a list of tds with each urbp |
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*/ |
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list_for_each_entry(td, &c67x00->td_list, td_list) |
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if (urb == td->urb) |
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td->urb = NULL; |
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|
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urbp = urb->hcpriv; |
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urb->hcpriv = NULL; |
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list_del(&urbp->hep_node); |
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kfree(urbp); |
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} |
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|
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/* -------------------------------------------------------------------------- */ |
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|
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static struct c67x00_ep_data * |
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c67x00_ep_data_alloc(struct c67x00_hcd *c67x00, struct urb *urb) |
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{ |
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struct usb_host_endpoint *hep = urb->ep; |
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struct c67x00_ep_data *ep_data; |
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int type; |
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|
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c67x00->current_frame = c67x00_get_current_frame_number(c67x00); |
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|
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/* Check if endpoint already has a c67x00_ep_data struct allocated */ |
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if (hep->hcpriv) { |
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ep_data = hep->hcpriv; |
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if (frame_after(c67x00->current_frame, ep_data->next_frame)) |
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ep_data->next_frame = |
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frame_add(c67x00->current_frame, 1); |
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return hep->hcpriv; |
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} |
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|
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/* Allocate and initialize a new c67x00 endpoint data structure */ |
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ep_data = kzalloc(sizeof(*ep_data), GFP_ATOMIC); |
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if (!ep_data) |
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return NULL; |
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INIT_LIST_HEAD(&ep_data->queue); |
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INIT_LIST_HEAD(&ep_data->node); |
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ep_data->hep = hep; |
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|
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/* hold a reference to udev as long as this endpoint lives, |
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* this is needed to possibly fix the data toggle */ |
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ep_data->dev = usb_get_dev(urb->dev); |
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hep->hcpriv = ep_data; |
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|
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/* For ISOC and INT endpoints, start ASAP: */ |
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ep_data->next_frame = frame_add(c67x00->current_frame, 1); |
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|
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/* Add the endpoint data to one of the pipe lists; must be added |
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in order of endpoint address */ |
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type = usb_pipetype(urb->pipe); |
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if (list_empty(&ep_data->node)) { |
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list_add(&ep_data->node, &c67x00->list[type]); |
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} else { |
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struct c67x00_ep_data *prev; |
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|
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list_for_each_entry(prev, &c67x00->list[type], node) { |
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if (prev->hep->desc.bEndpointAddress > |
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hep->desc.bEndpointAddress) { |
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list_add(&ep_data->node, prev->node.prev); |
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break; |
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} |
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} |
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} |
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return ep_data; |
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} |
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static int c67x00_ep_data_free(struct usb_host_endpoint *hep) |
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{ |
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struct c67x00_ep_data *ep_data = hep->hcpriv; |
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if (!ep_data) |
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return 0; |
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if (!list_empty(&ep_data->queue)) |
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return -EBUSY; |
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usb_put_dev(ep_data->dev); |
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list_del(&ep_data->queue); |
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list_del(&ep_data->node); |
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kfree(ep_data); |
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hep->hcpriv = NULL; |
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return 0; |
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} |
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void c67x00_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep) |
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{ |
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struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd); |
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unsigned long flags; |
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if (!list_empty(&ep->urb_list)) |
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dev_warn(c67x00_hcd_dev(c67x00), "error: urb list not empty\n"); |
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spin_lock_irqsave(&c67x00->lock, flags); |
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|
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/* loop waiting for all transfers in the endpoint queue to complete */ |
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while (c67x00_ep_data_free(ep)) { |
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/* Drop the lock so we can sleep waiting for the hardware */ |
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spin_unlock_irqrestore(&c67x00->lock, flags); |
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|
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/* it could happen that we reinitialize this completion, while |
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* somebody was waiting for that completion. The timeout and |
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* while loop handle such cases, but this might be improved */ |
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reinit_completion(&c67x00->endpoint_disable); |
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c67x00_sched_kick(c67x00); |
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wait_for_completion_timeout(&c67x00->endpoint_disable, 1 * HZ); |
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|
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spin_lock_irqsave(&c67x00->lock, flags); |
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} |
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|
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spin_unlock_irqrestore(&c67x00->lock, flags); |
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} |
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|
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/* -------------------------------------------------------------------------- */ |
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|
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static inline int get_root_port(struct usb_device *dev) |
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{ |
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while (dev->parent->parent) |
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dev = dev->parent; |
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return dev->portnum; |
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} |
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|
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int c67x00_urb_enqueue(struct usb_hcd *hcd, |
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struct urb *urb, gfp_t mem_flags) |
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{ |
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int ret; |
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unsigned long flags; |
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struct c67x00_urb_priv *urbp; |
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struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd); |
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int port = get_root_port(urb->dev)-1; |
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|
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/* Allocate and initialize urb private data */ |
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urbp = kzalloc(sizeof(*urbp), mem_flags); |
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if (!urbp) { |
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ret = -ENOMEM; |
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goto err_urbp; |
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} |
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|
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spin_lock_irqsave(&c67x00->lock, flags); |
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|
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/* Make sure host controller is running */ |
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if (!HC_IS_RUNNING(hcd->state)) { |
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ret = -ENODEV; |
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goto err_not_linked; |
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} |
|
|
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ret = usb_hcd_link_urb_to_ep(hcd, urb); |
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if (ret) |
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goto err_not_linked; |
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INIT_LIST_HEAD(&urbp->hep_node); |
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urbp->urb = urb; |
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urbp->port = port; |
|
|
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urbp->ep_data = c67x00_ep_data_alloc(c67x00, urb); |
|
|
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if (!urbp->ep_data) { |
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ret = -ENOMEM; |
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goto err_epdata; |
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} |
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|
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/* TODO claim bandwidth with usb_claim_bandwidth? |
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* also release it somewhere! */ |
|
|
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urb->hcpriv = urbp; |
|
|
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urb->actual_length = 0; /* Nothing received/transmitted yet */ |
|
|
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switch (usb_pipetype(urb->pipe)) { |
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case PIPE_CONTROL: |
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urb->interval = SETUP_STAGE; |
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break; |
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case PIPE_INTERRUPT: |
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break; |
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case PIPE_BULK: |
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break; |
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case PIPE_ISOCHRONOUS: |
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if (c67x00->urb_iso_count == 0) |
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c67x00->max_frame_bw = MAX_FRAME_BW_ISO; |
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c67x00->urb_iso_count++; |
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/* Assume always URB_ISO_ASAP, FIXME */ |
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if (list_empty(&urbp->ep_data->queue)) |
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urb->start_frame = urbp->ep_data->next_frame; |
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else { |
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/* Go right after the last one */ |
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struct urb *last_urb; |
|
|
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last_urb = list_entry(urbp->ep_data->queue.prev, |
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struct c67x00_urb_priv, |
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hep_node)->urb; |
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urb->start_frame = |
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frame_add(last_urb->start_frame, |
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last_urb->number_of_packets * |
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last_urb->interval); |
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} |
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urbp->cnt = 0; |
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break; |
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} |
|
|
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/* Add the URB to the endpoint queue */ |
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list_add_tail(&urbp->hep_node, &urbp->ep_data->queue); |
|
|
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/* If this is the only URB, kick start the controller */ |
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if (!c67x00->urb_count++) |
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c67x00_ll_hpi_enable_sofeop(c67x00->sie); |
|
|
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c67x00_sched_kick(c67x00); |
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spin_unlock_irqrestore(&c67x00->lock, flags); |
|
|
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return 0; |
|
|
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err_epdata: |
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usb_hcd_unlink_urb_from_ep(hcd, urb); |
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err_not_linked: |
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spin_unlock_irqrestore(&c67x00->lock, flags); |
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kfree(urbp); |
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err_urbp: |
|
|
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return ret; |
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} |
|
|
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int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) |
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{ |
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struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd); |
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unsigned long flags; |
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int rc; |
|
|
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spin_lock_irqsave(&c67x00->lock, flags); |
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rc = usb_hcd_check_unlink_urb(hcd, urb, status); |
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if (rc) |
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goto done; |
|
|
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c67x00_release_urb(c67x00, urb); |
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usb_hcd_unlink_urb_from_ep(hcd, urb); |
|
|
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spin_unlock(&c67x00->lock); |
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usb_hcd_giveback_urb(hcd, urb, status); |
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spin_lock(&c67x00->lock); |
|
|
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spin_unlock_irqrestore(&c67x00->lock, flags); |
|
|
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return 0; |
|
|
|
done: |
|
spin_unlock_irqrestore(&c67x00->lock, flags); |
|
return rc; |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
/* |
|
* pre: c67x00 locked, urb unlocked |
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*/ |
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static void |
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c67x00_giveback_urb(struct c67x00_hcd *c67x00, struct urb *urb, int status) |
|
{ |
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struct c67x00_urb_priv *urbp; |
|
|
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if (!urb) |
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return; |
|
|
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urbp = urb->hcpriv; |
|
urbp->status = status; |
|
|
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list_del_init(&urbp->hep_node); |
|
|
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c67x00_release_urb(c67x00, urb); |
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usb_hcd_unlink_urb_from_ep(c67x00_hcd_to_hcd(c67x00), urb); |
|
spin_unlock(&c67x00->lock); |
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usb_hcd_giveback_urb(c67x00_hcd_to_hcd(c67x00), urb, status); |
|
spin_lock(&c67x00->lock); |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
static int c67x00_claim_frame_bw(struct c67x00_hcd *c67x00, struct urb *urb, |
|
int len, int periodic) |
|
{ |
|
struct c67x00_urb_priv *urbp = urb->hcpriv; |
|
int bit_time; |
|
|
|
/* According to the C67x00 BIOS user manual, page 3-18,19, the |
|
* following calculations provide the full speed bit times for |
|
* a transaction. |
|
* |
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* FS(in) = 112.5 + 9.36*BC + HOST_DELAY |
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* FS(in,iso) = 90.5 + 9.36*BC + HOST_DELAY |
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* FS(out) = 112.5 + 9.36*BC + HOST_DELAY |
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* FS(out,iso) = 78.4 + 9.36*BC + HOST_DELAY |
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* LS(in) = 802.4 + 75.78*BC + HOST_DELAY |
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* LS(out) = 802.6 + 74.67*BC + HOST_DELAY |
|
* |
|
* HOST_DELAY == 106 for the c67200 and c67300. |
|
*/ |
|
|
|
/* make calculations in 1/100 bit times to maintain resolution */ |
|
if (urbp->ep_data->dev->speed == USB_SPEED_LOW) { |
|
/* Low speed pipe */ |
|
if (usb_pipein(urb->pipe)) |
|
bit_time = 80240 + 7578*len; |
|
else |
|
bit_time = 80260 + 7467*len; |
|
} else { |
|
/* FS pipes */ |
|
if (usb_pipeisoc(urb->pipe)) |
|
bit_time = usb_pipein(urb->pipe) ? 9050 : 7840; |
|
else |
|
bit_time = 11250; |
|
bit_time += 936*len; |
|
} |
|
|
|
/* Scale back down to integer bit times. Use a host delay of 106. |
|
* (this is the only place it is used) */ |
|
bit_time = ((bit_time+50) / 100) + 106; |
|
|
|
if (unlikely(bit_time + c67x00->bandwidth_allocated >= |
|
c67x00->max_frame_bw)) |
|
return -EMSGSIZE; |
|
|
|
if (unlikely(c67x00->next_td_addr + CY_TD_SIZE >= |
|
c67x00->td_base_addr + SIE_TD_SIZE)) |
|
return -EMSGSIZE; |
|
|
|
if (unlikely(c67x00->next_buf_addr + len >= |
|
c67x00->buf_base_addr + SIE_TD_BUF_SIZE)) |
|
return -EMSGSIZE; |
|
|
|
if (periodic) { |
|
if (unlikely(bit_time + c67x00->periodic_bw_allocated >= |
|
MAX_PERIODIC_BW(c67x00->max_frame_bw))) |
|
return -EMSGSIZE; |
|
c67x00->periodic_bw_allocated += bit_time; |
|
} |
|
|
|
c67x00->bandwidth_allocated += bit_time; |
|
return 0; |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
/* |
|
* td_addr and buf_addr must be word aligned |
|
*/ |
|
static int c67x00_create_td(struct c67x00_hcd *c67x00, struct urb *urb, |
|
void *data, int len, int pid, int toggle, |
|
unsigned long privdata) |
|
{ |
|
struct c67x00_td *td; |
|
struct c67x00_urb_priv *urbp = urb->hcpriv; |
|
const __u8 active_flag = 1, retry_cnt = 3; |
|
__u8 cmd = 0; |
|
int tt = 0; |
|
|
|
if (c67x00_claim_frame_bw(c67x00, urb, len, usb_pipeisoc(urb->pipe) |
|
|| usb_pipeint(urb->pipe))) |
|
return -EMSGSIZE; /* Not really an error, but expected */ |
|
|
|
td = kzalloc(sizeof(*td), GFP_ATOMIC); |
|
if (!td) |
|
return -ENOMEM; |
|
|
|
td->pipe = urb->pipe; |
|
td->ep_data = urbp->ep_data; |
|
|
|
if ((td_udev(td)->speed == USB_SPEED_LOW) && |
|
!(c67x00->low_speed_ports & (1 << urbp->port))) |
|
cmd |= PREAMBLE_EN; |
|
|
|
switch (usb_pipetype(td->pipe)) { |
|
case PIPE_ISOCHRONOUS: |
|
tt = TT_ISOCHRONOUS; |
|
cmd |= ISO_EN; |
|
break; |
|
case PIPE_CONTROL: |
|
tt = TT_CONTROL; |
|
break; |
|
case PIPE_BULK: |
|
tt = TT_BULK; |
|
break; |
|
case PIPE_INTERRUPT: |
|
tt = TT_INTERRUPT; |
|
break; |
|
} |
|
|
|
if (toggle) |
|
cmd |= SEQ_SEL; |
|
|
|
cmd |= ARM_EN; |
|
|
|
/* SW part */ |
|
td->td_addr = c67x00->next_td_addr; |
|
c67x00->next_td_addr = c67x00->next_td_addr + CY_TD_SIZE; |
|
|
|
/* HW part */ |
|
td->ly_base_addr = __cpu_to_le16(c67x00->next_buf_addr); |
|
td->port_length = __cpu_to_le16((c67x00->sie->sie_num << 15) | |
|
(urbp->port << 14) | (len & 0x3FF)); |
|
td->pid_ep = ((pid & 0xF) << TD_PIDEP_OFFSET) | |
|
(usb_pipeendpoint(td->pipe) & 0xF); |
|
td->dev_addr = usb_pipedevice(td->pipe) & 0x7F; |
|
td->ctrl_reg = cmd; |
|
td->status = 0; |
|
td->retry_cnt = (tt << TT_OFFSET) | (active_flag << 4) | retry_cnt; |
|
td->residue = 0; |
|
td->next_td_addr = __cpu_to_le16(c67x00->next_td_addr); |
|
|
|
/* SW part */ |
|
td->data = data; |
|
td->urb = urb; |
|
td->privdata = privdata; |
|
|
|
c67x00->next_buf_addr += (len + 1) & ~0x01; /* properly align */ |
|
|
|
list_add_tail(&td->td_list, &c67x00->td_list); |
|
return 0; |
|
} |
|
|
|
static inline void c67x00_release_td(struct c67x00_td *td) |
|
{ |
|
list_del_init(&td->td_list); |
|
kfree(td); |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
static int c67x00_add_data_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
|
{ |
|
int remaining; |
|
int toggle; |
|
int pid; |
|
int ret = 0; |
|
int maxps; |
|
int need_empty; |
|
|
|
toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
|
usb_pipeout(urb->pipe)); |
|
remaining = urb->transfer_buffer_length - urb->actual_length; |
|
|
|
maxps = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)); |
|
|
|
need_empty = (urb->transfer_flags & URB_ZERO_PACKET) && |
|
usb_pipeout(urb->pipe) && !(remaining % maxps); |
|
|
|
while (remaining || need_empty) { |
|
int len; |
|
char *td_buf; |
|
|
|
len = (remaining > maxps) ? maxps : remaining; |
|
if (!len) |
|
need_empty = 0; |
|
|
|
pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN; |
|
td_buf = urb->transfer_buffer + urb->transfer_buffer_length - |
|
remaining; |
|
ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, toggle, |
|
DATA_STAGE); |
|
if (ret) |
|
return ret; /* td wasn't created */ |
|
|
|
toggle ^= 1; |
|
remaining -= len; |
|
if (usb_pipecontrol(urb->pipe)) |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* return 0 in case more bandwidth is available, else errorcode |
|
*/ |
|
static int c67x00_add_ctrl_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
|
{ |
|
int ret; |
|
int pid; |
|
|
|
switch (urb->interval) { |
|
default: |
|
case SETUP_STAGE: |
|
ret = c67x00_create_td(c67x00, urb, urb->setup_packet, |
|
8, USB_PID_SETUP, 0, SETUP_STAGE); |
|
if (ret) |
|
return ret; |
|
urb->interval = SETUP_STAGE; |
|
usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
|
usb_pipeout(urb->pipe), 1); |
|
break; |
|
case DATA_STAGE: |
|
if (urb->transfer_buffer_length) { |
|
ret = c67x00_add_data_urb(c67x00, urb); |
|
if (ret) |
|
return ret; |
|
break; |
|
} |
|
fallthrough; |
|
case STATUS_STAGE: |
|
pid = !usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN; |
|
ret = c67x00_create_td(c67x00, urb, NULL, 0, pid, 1, |
|
STATUS_STAGE); |
|
if (ret) |
|
return ret; |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* return 0 in case more bandwidth is available, else errorcode |
|
*/ |
|
static int c67x00_add_int_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
|
{ |
|
struct c67x00_urb_priv *urbp = urb->hcpriv; |
|
|
|
if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) { |
|
urbp->ep_data->next_frame = |
|
frame_add(urbp->ep_data->next_frame, urb->interval); |
|
return c67x00_add_data_urb(c67x00, urb); |
|
} |
|
return 0; |
|
} |
|
|
|
static int c67x00_add_iso_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
|
{ |
|
struct c67x00_urb_priv *urbp = urb->hcpriv; |
|
|
|
if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) { |
|
char *td_buf; |
|
int len, pid, ret; |
|
|
|
BUG_ON(urbp->cnt >= urb->number_of_packets); |
|
|
|
td_buf = urb->transfer_buffer + |
|
urb->iso_frame_desc[urbp->cnt].offset; |
|
len = urb->iso_frame_desc[urbp->cnt].length; |
|
pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN; |
|
|
|
ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, 0, |
|
urbp->cnt); |
|
if (ret) { |
|
dev_dbg(c67x00_hcd_dev(c67x00), "create failed: %d\n", |
|
ret); |
|
urb->iso_frame_desc[urbp->cnt].actual_length = 0; |
|
urb->iso_frame_desc[urbp->cnt].status = ret; |
|
if (urbp->cnt + 1 == urb->number_of_packets) |
|
c67x00_giveback_urb(c67x00, urb, 0); |
|
} |
|
|
|
urbp->ep_data->next_frame = |
|
frame_add(urbp->ep_data->next_frame, urb->interval); |
|
urbp->cnt++; |
|
} |
|
return 0; |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
static void c67x00_fill_from_list(struct c67x00_hcd *c67x00, int type, |
|
int (*add)(struct c67x00_hcd *, struct urb *)) |
|
{ |
|
struct c67x00_ep_data *ep_data; |
|
struct urb *urb; |
|
|
|
/* traverse every endpoint on the list */ |
|
list_for_each_entry(ep_data, &c67x00->list[type], node) { |
|
if (!list_empty(&ep_data->queue)) { |
|
/* and add the first urb */ |
|
/* isochronous transfer rely on this */ |
|
urb = list_entry(ep_data->queue.next, |
|
struct c67x00_urb_priv, |
|
hep_node)->urb; |
|
add(c67x00, urb); |
|
} |
|
} |
|
} |
|
|
|
static void c67x00_fill_frame(struct c67x00_hcd *c67x00) |
|
{ |
|
struct c67x00_td *td, *ttd; |
|
|
|
/* Check if we can proceed */ |
|
if (!list_empty(&c67x00->td_list)) { |
|
dev_warn(c67x00_hcd_dev(c67x00), |
|
"TD list not empty! This should not happen!\n"); |
|
list_for_each_entry_safe(td, ttd, &c67x00->td_list, td_list) { |
|
dbg_td(c67x00, td, "Unprocessed td"); |
|
c67x00_release_td(td); |
|
} |
|
} |
|
|
|
/* Reinitialize variables */ |
|
c67x00->bandwidth_allocated = 0; |
|
c67x00->periodic_bw_allocated = 0; |
|
|
|
c67x00->next_td_addr = c67x00->td_base_addr; |
|
c67x00->next_buf_addr = c67x00->buf_base_addr; |
|
|
|
/* Fill the list */ |
|
c67x00_fill_from_list(c67x00, PIPE_ISOCHRONOUS, c67x00_add_iso_urb); |
|
c67x00_fill_from_list(c67x00, PIPE_INTERRUPT, c67x00_add_int_urb); |
|
c67x00_fill_from_list(c67x00, PIPE_CONTROL, c67x00_add_ctrl_urb); |
|
c67x00_fill_from_list(c67x00, PIPE_BULK, c67x00_add_data_urb); |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
/* |
|
* Get TD from C67X00 |
|
*/ |
|
static inline void |
|
c67x00_parse_td(struct c67x00_hcd *c67x00, struct c67x00_td *td) |
|
{ |
|
c67x00_ll_read_mem_le16(c67x00->sie->dev, |
|
td->td_addr, td, CY_TD_SIZE); |
|
|
|
if (usb_pipein(td->pipe) && td_actual_bytes(td)) |
|
c67x00_ll_read_mem_le16(c67x00->sie->dev, td_ly_base_addr(td), |
|
td->data, td_actual_bytes(td)); |
|
} |
|
|
|
static int c67x00_td_to_error(struct c67x00_hcd *c67x00, struct c67x00_td *td) |
|
{ |
|
if (td->status & TD_STATUSMASK_ERR) { |
|
dbg_td(c67x00, td, "ERROR_FLAG"); |
|
return -EILSEQ; |
|
} |
|
if (td->status & TD_STATUSMASK_STALL) { |
|
/* dbg_td(c67x00, td, "STALL"); */ |
|
return -EPIPE; |
|
} |
|
if (td->status & TD_STATUSMASK_TMOUT) { |
|
dbg_td(c67x00, td, "TIMEOUT"); |
|
return -ETIMEDOUT; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static inline int c67x00_end_of_data(struct c67x00_td *td) |
|
{ |
|
int maxps, need_empty, remaining; |
|
struct urb *urb = td->urb; |
|
int act_bytes; |
|
|
|
act_bytes = td_actual_bytes(td); |
|
|
|
if (unlikely(!act_bytes)) |
|
return 1; /* This was an empty packet */ |
|
|
|
maxps = usb_maxpacket(td_udev(td), td->pipe, usb_pipeout(td->pipe)); |
|
|
|
if (unlikely(act_bytes < maxps)) |
|
return 1; /* Smaller then full packet */ |
|
|
|
remaining = urb->transfer_buffer_length - urb->actual_length; |
|
need_empty = (urb->transfer_flags & URB_ZERO_PACKET) && |
|
usb_pipeout(urb->pipe) && !(remaining % maxps); |
|
|
|
if (unlikely(!remaining && !need_empty)) |
|
return 1; |
|
|
|
return 0; |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
/* Remove all td's from the list which come |
|
* after last_td and are meant for the same pipe. |
|
* This is used when a short packet has occurred */ |
|
static inline void c67x00_clear_pipe(struct c67x00_hcd *c67x00, |
|
struct c67x00_td *last_td) |
|
{ |
|
struct c67x00_td *td, *tmp; |
|
td = last_td; |
|
tmp = last_td; |
|
while (td->td_list.next != &c67x00->td_list) { |
|
td = list_entry(td->td_list.next, struct c67x00_td, td_list); |
|
if (td->pipe == last_td->pipe) { |
|
c67x00_release_td(td); |
|
td = tmp; |
|
} |
|
tmp = td; |
|
} |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
static void c67x00_handle_successful_td(struct c67x00_hcd *c67x00, |
|
struct c67x00_td *td) |
|
{ |
|
struct urb *urb = td->urb; |
|
|
|
if (!urb) |
|
return; |
|
|
|
urb->actual_length += td_actual_bytes(td); |
|
|
|
switch (usb_pipetype(td->pipe)) { |
|
/* isochronous tds are handled separately */ |
|
case PIPE_CONTROL: |
|
switch (td->privdata) { |
|
case SETUP_STAGE: |
|
urb->interval = |
|
urb->transfer_buffer_length ? |
|
DATA_STAGE : STATUS_STAGE; |
|
/* Don't count setup_packet with normal data: */ |
|
urb->actual_length = 0; |
|
break; |
|
|
|
case DATA_STAGE: |
|
if (c67x00_end_of_data(td)) { |
|
urb->interval = STATUS_STAGE; |
|
c67x00_clear_pipe(c67x00, td); |
|
} |
|
break; |
|
|
|
case STATUS_STAGE: |
|
urb->interval = 0; |
|
c67x00_giveback_urb(c67x00, urb, 0); |
|
break; |
|
} |
|
break; |
|
|
|
case PIPE_INTERRUPT: |
|
case PIPE_BULK: |
|
if (unlikely(c67x00_end_of_data(td))) { |
|
c67x00_clear_pipe(c67x00, td); |
|
c67x00_giveback_urb(c67x00, urb, 0); |
|
} |
|
break; |
|
} |
|
} |
|
|
|
static void c67x00_handle_isoc(struct c67x00_hcd *c67x00, struct c67x00_td *td) |
|
{ |
|
struct urb *urb = td->urb; |
|
int cnt; |
|
|
|
if (!urb) |
|
return; |
|
|
|
cnt = td->privdata; |
|
|
|
if (td->status & TD_ERROR_MASK) |
|
urb->error_count++; |
|
|
|
urb->iso_frame_desc[cnt].actual_length = td_actual_bytes(td); |
|
urb->iso_frame_desc[cnt].status = c67x00_td_to_error(c67x00, td); |
|
if (cnt + 1 == urb->number_of_packets) /* Last packet */ |
|
c67x00_giveback_urb(c67x00, urb, 0); |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
/* |
|
* c67x00_check_td_list - handle tds which have been processed by the c67x00 |
|
* pre: current_td == 0 |
|
*/ |
|
static inline void c67x00_check_td_list(struct c67x00_hcd *c67x00) |
|
{ |
|
struct c67x00_td *td, *tmp; |
|
struct urb *urb; |
|
int ack_ok; |
|
int clear_endpoint; |
|
|
|
list_for_each_entry_safe(td, tmp, &c67x00->td_list, td_list) { |
|
/* get the TD */ |
|
c67x00_parse_td(c67x00, td); |
|
urb = td->urb; /* urb can be NULL! */ |
|
ack_ok = 0; |
|
clear_endpoint = 1; |
|
|
|
/* Handle isochronous transfers separately */ |
|
if (usb_pipeisoc(td->pipe)) { |
|
clear_endpoint = 0; |
|
c67x00_handle_isoc(c67x00, td); |
|
goto cont; |
|
} |
|
|
|
/* When an error occurs, all td's for that pipe go into an |
|
* inactive state. This state matches successful transfers so |
|
* we must make sure not to service them. */ |
|
if (td->status & TD_ERROR_MASK) { |
|
c67x00_giveback_urb(c67x00, urb, |
|
c67x00_td_to_error(c67x00, td)); |
|
goto cont; |
|
} |
|
|
|
if ((td->status & TD_STATUSMASK_NAK) || !td_sequence_ok(td) || |
|
!td_acked(td)) |
|
goto cont; |
|
|
|
/* Sequence ok and acked, don't need to fix toggle */ |
|
ack_ok = 1; |
|
|
|
if (unlikely(td->status & TD_STATUSMASK_OVF)) { |
|
if (td_residue(td) & TD_RESIDUE_OVERFLOW) { |
|
/* Overflow */ |
|
c67x00_giveback_urb(c67x00, urb, -EOVERFLOW); |
|
goto cont; |
|
} |
|
} |
|
|
|
clear_endpoint = 0; |
|
c67x00_handle_successful_td(c67x00, td); |
|
|
|
cont: |
|
if (clear_endpoint) |
|
c67x00_clear_pipe(c67x00, td); |
|
if (ack_ok) |
|
usb_settoggle(td_udev(td), usb_pipeendpoint(td->pipe), |
|
usb_pipeout(td->pipe), |
|
!(td->ctrl_reg & SEQ_SEL)); |
|
/* next in list could have been removed, due to clear_pipe! */ |
|
tmp = list_entry(td->td_list.next, typeof(*td), td_list); |
|
c67x00_release_td(td); |
|
} |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
static inline int c67x00_all_tds_processed(struct c67x00_hcd *c67x00) |
|
{ |
|
/* If all tds are processed, we can check the previous frame (if |
|
* there was any) and start our next frame. |
|
*/ |
|
return !c67x00_ll_husb_get_current_td(c67x00->sie); |
|
} |
|
|
|
/* |
|
* Send td to C67X00 |
|
*/ |
|
static void c67x00_send_td(struct c67x00_hcd *c67x00, struct c67x00_td *td) |
|
{ |
|
int len = td_length(td); |
|
|
|
if (len && ((td->pid_ep & TD_PIDEPMASK_PID) != TD_PID_IN)) |
|
c67x00_ll_write_mem_le16(c67x00->sie->dev, td_ly_base_addr(td), |
|
td->data, len); |
|
|
|
c67x00_ll_write_mem_le16(c67x00->sie->dev, |
|
td->td_addr, td, CY_TD_SIZE); |
|
} |
|
|
|
static void c67x00_send_frame(struct c67x00_hcd *c67x00) |
|
{ |
|
struct c67x00_td *td; |
|
|
|
if (list_empty(&c67x00->td_list)) |
|
dev_warn(c67x00_hcd_dev(c67x00), |
|
"%s: td list should not be empty here!\n", |
|
__func__); |
|
|
|
list_for_each_entry(td, &c67x00->td_list, td_list) { |
|
if (td->td_list.next == &c67x00->td_list) |
|
td->next_td_addr = 0; /* Last td in list */ |
|
|
|
c67x00_send_td(c67x00, td); |
|
} |
|
|
|
c67x00_ll_husb_set_current_td(c67x00->sie, c67x00->td_base_addr); |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
/* |
|
* c67x00_do_work - Schedulers state machine |
|
*/ |
|
static void c67x00_do_work(struct c67x00_hcd *c67x00) |
|
{ |
|
spin_lock(&c67x00->lock); |
|
/* Make sure all tds are processed */ |
|
if (!c67x00_all_tds_processed(c67x00)) |
|
goto out; |
|
|
|
c67x00_check_td_list(c67x00); |
|
|
|
/* no td's are being processed (current == 0) |
|
* and all have been "checked" */ |
|
complete(&c67x00->endpoint_disable); |
|
|
|
if (!list_empty(&c67x00->td_list)) |
|
goto out; |
|
|
|
c67x00->current_frame = c67x00_get_current_frame_number(c67x00); |
|
if (c67x00->current_frame == c67x00->last_frame) |
|
goto out; /* Don't send tds in same frame */ |
|
c67x00->last_frame = c67x00->current_frame; |
|
|
|
/* If no urbs are scheduled, our work is done */ |
|
if (!c67x00->urb_count) { |
|
c67x00_ll_hpi_disable_sofeop(c67x00->sie); |
|
goto out; |
|
} |
|
|
|
c67x00_fill_frame(c67x00); |
|
if (!list_empty(&c67x00->td_list)) |
|
/* TD's have been added to the frame */ |
|
c67x00_send_frame(c67x00); |
|
|
|
out: |
|
spin_unlock(&c67x00->lock); |
|
} |
|
|
|
/* -------------------------------------------------------------------------- */ |
|
|
|
static void c67x00_sched_work(struct work_struct *work) |
|
{ |
|
struct c67x00_hcd *c67x00; |
|
|
|
c67x00 = container_of(work, struct c67x00_hcd, work); |
|
c67x00_do_work(c67x00); |
|
} |
|
|
|
void c67x00_sched_kick(struct c67x00_hcd *c67x00) |
|
{ |
|
queue_work(system_highpri_wq, &c67x00->work); |
|
} |
|
|
|
int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00) |
|
{ |
|
INIT_WORK(&c67x00->work, c67x00_sched_work); |
|
return 0; |
|
} |
|
|
|
void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00) |
|
{ |
|
cancel_work_sync(&c67x00->work); |
|
}
|
|
|