drivers/usb/c67x00/c67x00-hcd.h

   1 /*
   2  * c67x00-hcd.h: Cypress C67X00 USB HCD
   3  *
   4  * Copyright (C) 2006-2008 Barco N.V.
   5  *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
   6  *    based on multiple host controller drivers inside the linux kernel.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  21  * MA  02110-1301  USA.
  22  */
  23
  24 #ifndef _USB_C67X00_HCD_H
  25 #define _USB_C67X00_HCD_H
  26
  27 #include <linux/kernel.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/list.h>
  30 #include <linux/usb.h>
  31 #include "../core/hcd.h"
  32 #include "c67x00.h"
  33
  34 /*
  35  * The following parameters depend on the CPU speed, bus speed, ...
  36  * These can be tuned for specific use cases, e.g. if isochronous transfers
  37  * are very important, bandwith can be sacrificed to guarantee that the
  38  * 1ms deadline will be met.
  39  * If bulk transfers are important, the MAX_FRAME_BW can be increased,
  40  * but some (or many) isochronous deadlines might not be met.
  41  *
  42  * The values are specified in bittime.
  43  */
  44
  45 /*
  46  * The current implementation switches between _STD (default) and _ISO (when
  47  * isochronous transfers are scheduled), in order to optimize the throughput
  48  * in normal cicrumstances, but also provide good isochronous behaviour.
  49  *
  50  * Bandwidth is described in bit time so with a 12MHz USB clock and 1ms
  51  * frames; there are 12000 bit times per frame.
  52  */
  53
  54 #define TOTAL_FRAME_BW          12000
  55 #define DEFAULT_EOT             2250
  56
  57 #define MAX_FRAME_BW_STD        (TOTAL_FRAME_BW - DEFAULT_EOT)
  58 #define MAX_FRAME_BW_ISO        2400
  59
  60 /*
  61  * Periodic transfers may only use 90% of the full frame, but as
  62  * we currently don't even use 90% of the full frame, we may
  63  * use the full usable time for periodic transfers.
  64  */
  65 #define MAX_PERIODIC_BW(full_bw)        full_bw
  66
  67 /* -------------------------------------------------------------------------- */
  68
  69 struct c67x00_hcd {
  70         spinlock_t lock;
  71         struct c67x00_sie *sie;
  72         unsigned int low_speed_ports;   /* bitmask of low speed ports */
  73         unsigned int urb_count;
  74         unsigned int urb_iso_count;
  75
  76         struct list_head list[4];       /* iso, int, ctrl, bulk */
  77 #if PIPE_BULK != 3
  78 #error "Sanity check failed, this code presumes PIPE_... to range from 0 to 3"
  79 #endif
  80
  81         /* USB bandwidth allocated to td_list */
  82         int bandwidth_allocated;
  83         /* USB bandwidth allocated for isoc/int transfer */
  84         int periodic_bw_allocated;
  85         struct list_head td_list;
  86         int max_frame_bw;
  87
  88         u16 td_base_addr;
  89         u16 buf_base_addr;
  90         u16 next_td_addr;
  91         u16 next_buf_addr;
  92
  93         struct tasklet_struct tasklet;
  94
  95         struct completion endpoint_disable;
  96
  97         u16 current_frame;
  98         u16 last_frame;
  99 };
 100
 101 static inline struct c67x00_hcd *hcd_to_c67x00_hcd(struct usb_hcd *hcd)
 102 {
 103         return (struct c67x00_hcd *)(hcd->hcd_priv);
 104 }
 105
 106 static inline struct usb_hcd *c67x00_hcd_to_hcd(struct c67x00_hcd *c67x00)
 107 {
 108         return container_of((void *)c67x00, struct usb_hcd, hcd_priv);
 109 }
 110
 111 /* ---------------------------------------------------------------------
 112  * Functions used by c67x00-drv
 113  */
 114
 115 int c67x00_hcd_probe(struct c67x00_sie *sie);
 116 void c67x00_hcd_remove(struct c67x00_sie *sie);
 117
 118 /* ---------------------------------------------------------------------
 119  * Transfer Descriptor scheduling functions
 120  */
 121 int c67x00_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags);
 122 int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
 123 void c67x00_endpoint_disable(struct usb_hcd *hcd,
 124                              struct usb_host_endpoint *ep);
 125
 126 void c67x00_hcd_msg_received(struct c67x00_sie *sie, u16 msg);
 127 void c67x00_sched_kick(struct c67x00_hcd *c67x00);
 128 int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00);
 129 void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00);
 130
 131 #define c67x00_hcd_dev(x)       (c67x00_hcd_to_hcd(x)->self.controller)
 132
 133 #endif                          /* _USB_C67X00_HCD_H */