134 lines
4.2 KiB
C
134 lines
4.2 KiB
C
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/*
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* c67x00-hcd.h: Cypress C67X00 USB HCD
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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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#ifndef _USB_C67X00_HCD_H
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#define _USB_C67X00_HCD_H
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "c67x00.h"
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/*
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* The following parameters depend on the CPU speed, bus speed, ...
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* These can be tuned for specific use cases, e.g. if isochronous transfers
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* are very important, bandwidth can be sacrificed to guarantee that the
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* 1ms deadline will be met.
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* If bulk transfers are important, the MAX_FRAME_BW can be increased,
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* but some (or many) isochronous deadlines might not be met.
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*
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* The values are specified in bittime.
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*/
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/*
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* The current implementation switches between _STD (default) and _ISO (when
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* isochronous transfers are scheduled), in order to optimize the throughput
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* in normal circumstances, but also provide good isochronous behaviour.
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*
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* Bandwidth is described in bit time so with a 12MHz USB clock and 1ms
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* frames; there are 12000 bit times per frame.
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*/
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#define TOTAL_FRAME_BW 12000
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#define DEFAULT_EOT 2250
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#define MAX_FRAME_BW_STD (TOTAL_FRAME_BW - DEFAULT_EOT)
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#define MAX_FRAME_BW_ISO 2400
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/*
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* Periodic transfers may only use 90% of the full frame, but as
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* we currently don't even use 90% of the full frame, we may
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* use the full usable time for periodic transfers.
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*/
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#define MAX_PERIODIC_BW(full_bw) full_bw
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/* -------------------------------------------------------------------------- */
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struct c67x00_hcd {
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spinlock_t lock;
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struct c67x00_sie *sie;
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unsigned int low_speed_ports; /* bitmask of low speed ports */
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unsigned int urb_count;
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unsigned int urb_iso_count;
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struct list_head list[4]; /* iso, int, ctrl, bulk */
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#if PIPE_BULK != 3
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#error "Sanity check failed, this code presumes PIPE_... to range from 0 to 3"
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#endif
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/* USB bandwidth allocated to td_list */
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int bandwidth_allocated;
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/* USB bandwidth allocated for isoc/int transfer */
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int periodic_bw_allocated;
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struct list_head td_list;
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int max_frame_bw;
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u16 td_base_addr;
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u16 buf_base_addr;
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u16 next_td_addr;
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u16 next_buf_addr;
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struct tasklet_struct tasklet;
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struct completion endpoint_disable;
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u16 current_frame;
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u16 last_frame;
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};
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static inline struct c67x00_hcd *hcd_to_c67x00_hcd(struct usb_hcd *hcd)
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{
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return (struct c67x00_hcd *)(hcd->hcd_priv);
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}
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static inline struct usb_hcd *c67x00_hcd_to_hcd(struct c67x00_hcd *c67x00)
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{
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return container_of((void *)c67x00, struct usb_hcd, hcd_priv);
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}
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/* ---------------------------------------------------------------------
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* Functions used by c67x00-drv
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*/
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int c67x00_hcd_probe(struct c67x00_sie *sie);
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void c67x00_hcd_remove(struct c67x00_sie *sie);
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/* ---------------------------------------------------------------------
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* Transfer Descriptor scheduling functions
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*/
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int c67x00_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags);
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int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
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void c67x00_endpoint_disable(struct usb_hcd *hcd,
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struct usb_host_endpoint *ep);
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void c67x00_hcd_msg_received(struct c67x00_sie *sie, u16 msg);
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void c67x00_sched_kick(struct c67x00_hcd *c67x00);
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int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00);
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void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00);
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#define c67x00_hcd_dev(x) (c67x00_hcd_to_hcd(x)->self.controller)
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#endif /* _USB_C67X00_HCD_H */
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