Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 281 insertions, 0 deletions

diff --git a/drivers/ide/ide-timing.h b/drivers/ide/ide-timing.h
new file mode 100644
index 000000000000..c1196ce15b4d
--- /dev/null
+++ b/drivers/ide/ide-timing.h
@@ -0,0 +1,281 @@
+#ifndef _IDE_TIMING_H
+#define _IDE_TIMING_H
+
+/*
+ * $Id: ide-timing.h,v 1.6 2001/12/23 22:47:56 vojtech Exp $
+ *
+ *  Copyright (c) 1999-2001 Vojtech Pavlik
+ */
+
+/*
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Should you need to contact me, the author, you can do so either by
+ * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
+ * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
+ */
+
+#include <linux/hdreg.h>
+
+#define XFER_PIO_5              0x0d
+#define XFER_UDMA_SLOW          0x4f
+
+struct ide_timing {
+        short mode;
+        short setup;    /* t1 */
+        short act8b;    /* t2 for 8-bit io */
+        short rec8b;    /* t2i for 8-bit io */
+        short cyc8b;    /* t0 for 8-bit io */
+        short active;   /* t2 or tD */
+        short recover;  /* t2i or tK */
+        short cycle;    /* t0 */
+        short udma;     /* t2CYCTYP/2 */
+};
+
+/*
+ * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
+ * These were taken from ATA/ATAPI-6 standard, rev 0a, except
+ * for PIO 5, which is a nonstandard extension and UDMA6, which
+ * is currently supported only by Maxtor drives. 
+ */
+
+static struct ide_timing ide_timing[] = {
+
+        { XFER_UDMA_6,     0,   0,   0,   0,   0,   0,   0,  15 },
+        { XFER_UDMA_5,     0,   0,   0,   0,   0,   0,   0,  20 },
+        { XFER_UDMA_4,     0,   0,   0,   0,   0,   0,   0,  30 },
+        { XFER_UDMA_3,     0,   0,   0,   0,   0,   0,   0,  45 },
+
+        { XFER_UDMA_2,     0,   0,   0,   0,   0,   0,   0,  60 },
+        { XFER_UDMA_1,     0,   0,   0,   0,   0,   0,   0,  80 },
+        { XFER_UDMA_0,     0,   0,   0,   0,   0,   0,   0, 120 },
+
+        { XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 },
+                                          
+        { XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 120,   0 },
+        { XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 150,   0 },
+        { XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 480,   0 },
+                                          
+        { XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 240,   0 },
+        { XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 480,   0 },
+        { XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 960,   0 },
+
+        { XFER_PIO_5,     20,  50,  30, 100,  50,  30, 100,   0 },
+        { XFER_PIO_4,     25,  70,  25, 120,  70,  25, 120,   0 },
+        { XFER_PIO_3,     30,  80,  70, 180,  80,  70, 180,   0 },
+
+        { XFER_PIO_2,     30, 290,  40, 330, 100,  90, 240,   0 },
+        { XFER_PIO_1,     50, 290,  93, 383, 125, 100, 383,   0 },
+        { XFER_PIO_0,     70, 290, 240, 600, 165, 150, 600,   0 },
+
+        { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960,   0 },
+
+        { -1 }
+};
+
+#define IDE_TIMING_SETUP        0x01
+#define IDE_TIMING_ACT8B        0x02
+#define IDE_TIMING_REC8B        0x04
+#define IDE_TIMING_CYC8B        0x08
+#define IDE_TIMING_8BIT         0x0e
+#define IDE_TIMING_ACTIVE       0x10
+#define IDE_TIMING_RECOVER      0x20
+#define IDE_TIMING_CYCLE        0x40
+#define IDE_TIMING_UDMA         0x80
+#define IDE_TIMING_ALL          0xff
+
+#define MIN(a,b)        ((a)<(b)?(a):(b))
+#define MAX(a,b)        ((a)>(b)?(a):(b))
+#define FIT(v,min,max)  MAX(MIN(v,max),min)
+#define ENOUGH(v,unit)  (((v)-1)/(unit)+1)
+#define EZ(v,unit)      ((v)?ENOUGH(v,unit):0)
+
+#define XFER_MODE       0xf0
+#define XFER_UDMA_133   0x48
+#define XFER_UDMA_100   0x44
+#define XFER_UDMA_66    0x42
+#define XFER_UDMA       0x40
+#define XFER_MWDMA      0x20
+#define XFER_SWDMA      0x10
+#define XFER_EPIO       0x01
+#define XFER_PIO        0x00
+
+static short ide_find_best_mode(ide_drive_t *drive, int map)
+{
+        struct hd_driveid *id = drive->id;
+        short best = 0;
+
+        if (!id)
+                return XFER_PIO_SLOW;
+
+        if ((map & XFER_UDMA) && (id->field_valid & 4)) {       /* Want UDMA and UDMA bitmap valid */
+
+                if ((map & XFER_UDMA_133) == XFER_UDMA_133)
+                        if ((best = (id->dma_ultra & 0x0040) ? XFER_UDMA_6 : 0)) return best;
+
+                if ((map & XFER_UDMA_100) == XFER_UDMA_100)
+                        if ((best = (id->dma_ultra & 0x0020) ? XFER_UDMA_5 : 0)) return best;
+
+                if ((map & XFER_UDMA_66) == XFER_UDMA_66)
+                        if ((best = (id->dma_ultra & 0x0010) ? XFER_UDMA_4 :
+                                    (id->dma_ultra & 0x0008) ? XFER_UDMA_3 : 0)) return best;
+
+                if ((best = (id->dma_ultra & 0x0004) ? XFER_UDMA_2 :
+                            (id->dma_ultra & 0x0002) ? XFER_UDMA_1 :
+                            (id->dma_ultra & 0x0001) ? XFER_UDMA_0 : 0)) return best;
+        }
+
+        if ((map & XFER_MWDMA) && (id->field_valid & 2)) {      /* Want MWDMA and drive has EIDE fields */
+
+                if ((best = (id->dma_mword & 0x0004) ? XFER_MW_DMA_2 :
+                            (id->dma_mword & 0x0002) ? XFER_MW_DMA_1 :
+                            (id->dma_mword & 0x0001) ? XFER_MW_DMA_0 : 0)) return best;
+        }
+
+        if (map & XFER_SWDMA) {                                 /* Want SWDMA */
+
+                if (id->field_valid & 2) {                      /* EIDE SWDMA */
+
+                        if ((best = (id->dma_1word & 0x0004) ? XFER_SW_DMA_2 :
+                                    (id->dma_1word & 0x0002) ? XFER_SW_DMA_1 :
+                                    (id->dma_1word & 0x0001) ? XFER_SW_DMA_0 : 0)) return best;
+                }
+
+                if (id->capability & 1) {                       /* Pre-EIDE style SWDMA */
+
+                        if ((best = (id->tDMA == 2) ? XFER_SW_DMA_2 :
+                                    (id->tDMA == 1) ? XFER_SW_DMA_1 :
+                                    (id->tDMA == 0) ? XFER_SW_DMA_0 : 0)) return best;
+                }
+        }
+
+
+        if ((map & XFER_EPIO) && (id->field_valid & 2)) {       /* EIDE PIO modes */
+
+                if ((best = (drive->id->eide_pio_modes & 4) ? XFER_PIO_5 :
+                            (drive->id->eide_pio_modes & 2) ? XFER_PIO_4 :
+                            (drive->id->eide_pio_modes & 1) ? XFER_PIO_3 : 0)) return best;
+        }
+        
+        return  (drive->id->tPIO == 2) ? XFER_PIO_2 :
+                (drive->id->tPIO == 1) ? XFER_PIO_1 :
+                (drive->id->tPIO == 0) ? XFER_PIO_0 : XFER_PIO_SLOW;
+}
+
+static void ide_timing_quantize(struct ide_timing *t, struct ide_timing *q, int T, int UT)
+{
+        q->setup   = EZ(t->setup   * 1000,  T);
+        q->act8b   = EZ(t->act8b   * 1000,  T);
+        q->rec8b   = EZ(t->rec8b   * 1000,  T);
+        q->cyc8b   = EZ(t->cyc8b   * 1000,  T);
+        q->active  = EZ(t->active  * 1000,  T);
+        q->recover = EZ(t->recover * 1000,  T);
+        q->cycle   = EZ(t->cycle   * 1000,  T);
+        q->udma    = EZ(t->udma    * 1000, UT);
+}
+
+static void ide_timing_merge(struct ide_timing *a, struct ide_timing *b, struct ide_timing *m, unsigned int what)
+{
+        if (what & IDE_TIMING_SETUP  ) m->setup   = MAX(a->setup,   b->setup);
+        if (what & IDE_TIMING_ACT8B  ) m->act8b   = MAX(a->act8b,   b->act8b);
+        if (what & IDE_TIMING_REC8B  ) m->rec8b   = MAX(a->rec8b,   b->rec8b);
+        if (what & IDE_TIMING_CYC8B  ) m->cyc8b   = MAX(a->cyc8b,   b->cyc8b);
+        if (what & IDE_TIMING_ACTIVE ) m->active  = MAX(a->active,  b->active);
+        if (what & IDE_TIMING_RECOVER) m->recover = MAX(a->recover, b->recover);
+        if (what & IDE_TIMING_CYCLE  ) m->cycle   = MAX(a->cycle,   b->cycle);
+        if (what & IDE_TIMING_UDMA   ) m->udma    = MAX(a->udma,    b->udma);
+}
+
+static struct ide_timing* ide_timing_find_mode(short speed)
+{
+        struct ide_timing *t;
+
+        for (t = ide_timing; t->mode != speed; t++)
+                if (t->mode < 0)
+                        return NULL;
+        return t; 
+}
+
+static int ide_timing_compute(ide_drive_t *drive, short speed, struct ide_timing *t, int T, int UT)
+{
+        struct hd_driveid *id = drive->id;
+        struct ide_timing *s, p;
+
+/*
+ * Find the mode.
+ */
+
+        if (!(s = ide_timing_find_mode(speed)))
+                return -EINVAL;
+
+/*
+ * If the drive is an EIDE drive, it can tell us it needs extended
+ * PIO/MWDMA cycle timing.
+ */
+
+        if (id && id->field_valid & 2) {        /* EIDE drive */
+
+                memset(&p, 0, sizeof(p));
+
+                switch (speed & XFER_MODE) {
+
+                        case XFER_PIO:
+                                if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = id->eide_pio;
+                                                    else p.cycle = p.cyc8b = id->eide_pio_iordy;
+                                break;
+
+                        case XFER_MWDMA:
+                                p.cycle = id->eide_dma_min;
+                                break;
+                }
+
+                ide_timing_merge(&p, t, t, IDE_TIMING_CYCLE | IDE_TIMING_CYC8B);
+        }
+
+/*
+ * Convert the timing to bus clock counts.
+ */
+
+        ide_timing_quantize(s, t, T, UT);
+
+/*
+ * Even in DMA/UDMA modes we still use PIO access for IDENTIFY, S.M.A.R.T
+ * and some other commands. We have to ensure that the DMA cycle timing is
+ * slower/equal than the fastest PIO timing.
+ */
+
+        if ((speed & XFER_MODE) != XFER_PIO) {
+                ide_timing_compute(drive, ide_find_best_mode(drive, XFER_PIO | XFER_EPIO), &p, T, UT);
+                ide_timing_merge(&p, t, t, IDE_TIMING_ALL);
+        }
+
+/*
+ * Lenghten active & recovery time so that cycle time is correct.
+ */
+
+        if (t->act8b + t->rec8b < t->cyc8b) {
+                t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
+                t->rec8b = t->cyc8b - t->act8b;
+        }
+
+        if (t->active + t->recover < t->cycle) {
+                t->active += (t->cycle - (t->active + t->recover)) / 2;
+                t->recover = t->cycle - t->active;
+        }
+
+        return 0;
+}
+
+#endif