c67x00-hcd.h
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/*
* c67x00-hcd.h: Cypress C67X00 USB HCD
*
* Copyright (C) 2006-2008 Barco N.V.
* Derived from the Cypress cy7c67200/300 ezusb linux driver and
* based on multiple host controller drivers inside the linux kernel.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA.
*/
#ifndef _USB_C67X00_HCD_H
#define _USB_C67X00_HCD_H
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "c67x00.h"
/*
* The following parameters depend on the CPU speed, bus speed, ...
* These can be tuned for specific use cases, e.g. if isochronous transfers
* are very important, bandwidth can be sacrificed to guarantee that the
* 1ms deadline will be met.
* If bulk transfers are important, the MAX_FRAME_BW can be increased,
* but some (or many) isochronous deadlines might not be met.
*
* The values are specified in bittime.
*/
/*
* The current implementation switches between _STD (default) and _ISO (when
* isochronous transfers are scheduled), in order to optimize the throughput
* in normal circumstances, but also provide good isochronous behaviour.
*
* Bandwidth is described in bit time so with a 12MHz USB clock and 1ms
* frames; there are 12000 bit times per frame.
*/
#define TOTAL_FRAME_BW 12000
#define DEFAULT_EOT 2250
#define MAX_FRAME_BW_STD (TOTAL_FRAME_BW - DEFAULT_EOT)
#define MAX_FRAME_BW_ISO 2400
/*
* Periodic transfers may only use 90% of the full frame, but as
* we currently don't even use 90% of the full frame, we may
* use the full usable time for periodic transfers.
*/
#define MAX_PERIODIC_BW(full_bw) full_bw
/* -------------------------------------------------------------------------- */
struct c67x00_hcd {
spinlock_t lock;
struct c67x00_sie *sie;
unsigned int low_speed_ports; /* bitmask of low speed ports */
unsigned int urb_count;
unsigned int urb_iso_count;
struct list_head list[4]; /* iso, int, ctrl, bulk */
#if PIPE_BULK != 3
#error "Sanity check failed, this code presumes PIPE_... to range from 0 to 3"
#endif
/* USB bandwidth allocated to td_list */
int bandwidth_allocated;
/* USB bandwidth allocated for isoc/int transfer */
int periodic_bw_allocated;
struct list_head td_list;
int max_frame_bw;
u16 td_base_addr;
u16 buf_base_addr;
u16 next_td_addr;
u16 next_buf_addr;
struct tasklet_struct tasklet;
struct completion endpoint_disable;
u16 current_frame;
u16 last_frame;
};
static inline struct c67x00_hcd *hcd_to_c67x00_hcd(struct usb_hcd *hcd)
{
return (struct c67x00_hcd *)(hcd->hcd_priv);
}
static inline struct usb_hcd *c67x00_hcd_to_hcd(struct c67x00_hcd *c67x00)
{
return container_of((void *)c67x00, struct usb_hcd, hcd_priv);
}
/* ---------------------------------------------------------------------
* Functions used by c67x00-drv
*/
int c67x00_hcd_probe(struct c67x00_sie *sie);
void c67x00_hcd_remove(struct c67x00_sie *sie);
/* ---------------------------------------------------------------------
* Transfer Descriptor scheduling functions
*/
int c67x00_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags);
int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
void c67x00_endpoint_disable(struct usb_hcd *hcd,
struct usb_host_endpoint *ep);
void c67x00_hcd_msg_received(struct c67x00_sie *sie, u16 msg);
void c67x00_sched_kick(struct c67x00_hcd *c67x00);
int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00);
void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00);
#define c67x00_hcd_dev(x) (c67x00_hcd_to_hcd(x)->self.controller)
#endif /* _USB_C67X00_HCD_H */