![Wolfram Sang](/assets/img/avatar_default.png)
Use this new function to make code more comprehensible, since we are reinitialzing the completion, not initializing. [akpm@linux-foundation.org: linux-next resyncs] Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> (personally at LCE13) Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1172 lines
30 KiB
C
1172 lines
30 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA.
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*/
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#include <linux/kthread.h>
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#include <linux/slab.h>
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#include "c67x00.h"
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#include "c67x00-hcd.h"
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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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* 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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* 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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/* 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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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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#define td_udev(td) ((td)->ep_data->dev)
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#define CY_TD_SIZE 12
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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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#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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/* 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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#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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#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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#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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#ifdef DEBUG
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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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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:");
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print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 1,
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td->data, td_length(td), 1);
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}
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#else /* DEBUG */
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static inline void
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dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg) { }
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#endif /* DEBUG */
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/* -------------------------------------------------------------------------- */
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/* Helper functions */
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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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* 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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* 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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* 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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* 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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/* 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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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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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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c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
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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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/* 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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/* 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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/* 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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/* 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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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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/* 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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/* 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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spin_lock_irqsave(&c67x00->lock, flags);
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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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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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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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spin_lock_irqsave(&c67x00->lock, flags);
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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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/* 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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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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/* 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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|
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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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|
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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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|
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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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|
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c67x00_sched_kick(c67x00);
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spin_unlock_irqrestore(&c67x00->lock, flags);
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|
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return 0;
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err_epdata:
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kfree(urbp);
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err_urbp:
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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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return ret;
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}
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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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|
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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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|
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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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|
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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);
|
|
|
|
return 0;
|
|
|
|
done:
|
|
spin_unlock_irqrestore(&c67x00->lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* pre: c67x00 locked, urb unlocked
|
|
*/
|
|
static void
|
|
c67x00_giveback_urb(struct c67x00_hcd *c67x00, struct urb *urb, int status)
|
|
{
|
|
struct c67x00_urb_priv *urbp;
|
|
|
|
if (!urb)
|
|
return;
|
|
|
|
urbp = urb->hcpriv;
|
|
urbp->status = status;
|
|
|
|
list_del_init(&urbp->hep_node);
|
|
|
|
c67x00_release_urb(c67x00, urb);
|
|
usb_hcd_unlink_urb_from_ep(c67x00_hcd_to_hcd(c67x00), urb);
|
|
spin_unlock(&c67x00->lock);
|
|
usb_hcd_giveback_urb(c67x00_hcd_to_hcd(c67x00), urb, urbp->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.
|
|
*
|
|
* FS(in) = 112.5 + 9.36*BC + HOST_DELAY
|
|
* FS(in,iso) = 90.5 + 9.36*BC + HOST_DELAY
|
|
* FS(out) = 112.5 + 9.36*BC + HOST_DELAY
|
|
* FS(out,iso) = 78.4 + 9.36*BC + HOST_DELAY
|
|
* LS(in) = 802.4 + 75.78*BC + HOST_DELAY
|
|
* 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;
|
|
} /* else 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) {
|
|
printk(KERN_DEBUG "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;
|
|
struct c67x00_urb_priv *urbp;
|
|
int cnt;
|
|
|
|
if (!urb)
|
|
return;
|
|
|
|
urbp = urb->hcpriv;
|
|
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_tasklet(unsigned long __c67x00)
|
|
{
|
|
struct c67x00_hcd *c67x00 = (struct c67x00_hcd *)__c67x00;
|
|
c67x00_do_work(c67x00);
|
|
}
|
|
|
|
void c67x00_sched_kick(struct c67x00_hcd *c67x00)
|
|
{
|
|
tasklet_hi_schedule(&c67x00->tasklet);
|
|
}
|
|
|
|
int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00)
|
|
{
|
|
tasklet_init(&c67x00->tasklet, c67x00_sched_tasklet,
|
|
(unsigned long)c67x00);
|
|
return 0;
|
|
}
|
|
|
|
void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00)
|
|
{
|
|
tasklet_kill(&c67x00->tasklet);
|
|
}
|