drivers/ide/timing.h

   1 /*
   2  *  Copyright (C) 1996  Linus Torvalds, Igor Abramov, and Mark Lord
   3  *  Copyright (C) 1999-2001 Vojtech Pavlik
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #define XFER_PIO_5              0x0d
  21 #define XFER_UDMA_SLOW          0x4f
  22
  23 struct ata_timing {
  24         short mode;
  25         short setup;    /* t1 */
  26         short act8b;    /* t2 for 8-bit io */
  27         short rec8b;    /* t2i for 8-bit io */
  28         short cyc8b;    /* t0 for 8-bit io */
  29         short active;   /* t2 or tD */
  30         short recover;  /* t2i or tK */
  31         short cycle;    /* t0 */
  32         short udma;     /* t2CYCTYP/2 */
  33 };
  34
  35 extern struct ata_timing ata_timing[];
  36
  37 #define IDE_TIMING_SETUP        0x01
  38 #define IDE_TIMING_ACT8B        0x02
  39 #define IDE_TIMING_REC8B        0x04
  40 #define IDE_TIMING_CYC8B        0x08
  41 #define IDE_TIMING_8BIT         0x0e
  42 #define IDE_TIMING_ACTIVE       0x10
  43 #define IDE_TIMING_RECOVER      0x20
  44 #define IDE_TIMING_CYCLE        0x40
  45 #define IDE_TIMING_UDMA         0x80
  46 #define IDE_TIMING_ALL          0xff
  47
  48 #define FIT(v,x,y)      max_t(int,min_t(int,v,y),x)
  49 #define ENOUGH(v,unit)  (((v)-1)/(unit)+1)
  50 #define EZ(v,unit)      ((v)?ENOUGH(v,unit):0)
  51
  52 /* see hpt366.c for details */
  53 #define XFER_UDMA_66_3  0x100
  54 #define XFER_UDMA_66_4  0x200
  55
  56 #define XFER_MODE       0xff0
  57 #define XFER_UDMA_133   0x800
  58 #define XFER_UDMA_100   0x400
  59 #define XFER_UDMA_66    0x300
  60 #define XFER_UDMA       0x040
  61 #define XFER_MWDMA      0x020
  62 #define XFER_SWDMA      0x010
  63 #define XFER_EPIO       0x001
  64 #define XFER_PIO        0x000
  65
  66 #define XFER_UDMA_ALL   0xf40
  67 #define XFER_UDMA_80W   0xf00
  68
  69 /* External interface to host chips channel timing setup.
  70  *
  71  * It's a bit elaborate due to the legacy we have to bear.
  72  */
  73
  74 extern short ata_timing_mode(struct ata_device *drive, int map);
  75 extern void ata_timing_quantize(struct ata_timing *t, struct ata_timing *q,
  76                 int T, int UT);
  77 extern void ata_timing_merge(struct ata_timing *a, struct ata_timing *b,
  78                 struct ata_timing *m, unsigned int what);
  79 void ata_timing_merge_8bit(struct ata_timing *t);
  80 extern struct ata_timing* ata_timing_data(short speed);
  81 extern int ata_timing_compute(struct ata_device *drive,
  82                 short speed, struct ata_timing *t, int T, int UT);
  83 extern u8 ata_best_pio_mode(struct ata_device *drive);