[src/trunk]: src/sys/arch/atari/pci Add more fuzziness to the MDRAM initialis...

[leo <leo%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ca6f563236b6
branches:  trunk
changeset: 467597:ca6f563236b6
user:      leo <leo%NetBSD.org@localhost>
date:      Fri Mar 26 08:21:49 1999 +0000

description:
Add more fuzziness to the MDRAM initialisation. Seems to work on a broader
range of et6[01]00 cards now.

diffstat:

 sys/arch/atari/pci/pci_tseng.c |  37 +++++++++++++++++++++++++++++--------
 1 files changed, 29 insertions(+), 8 deletions(-)

diffs (94 lines):

diff -r 0df2c56fb0bf -r ca6f563236b6 sys/arch/atari/pci/pci_tseng.c
--- a/sys/arch/atari/pci/pci_tseng.c    Fri Mar 26 08:15:23 1999 +0000
+++ b/sys/arch/atari/pci/pci_tseng.c    Fri Mar 26 08:21:49 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pci_tseng.c,v 1.1 1999/03/15 15:47:22 leo Exp $        */
+/*     $NetBSD: pci_tseng.c,v 1.2 1999/03/26 08:21:49 leo Exp $        */
 
 /*
  * Copyright (c) 1999 Leo Weppelman.  All rights reserved.
@@ -40,7 +40,7 @@
 #define PCI_LINMEMBASE 0x0e000000
 #define PCI_IOBASE     0x800
 
-static void et6000_init(volatile u_char *, u_char *);
+static void et6000_init(volatile u_char *, u_char *, int);
 
 /*
  * Use tables for the card init...
@@ -64,6 +64,9 @@
        0x85, 0x01, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00,
        0x05, 0x01, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00 };
 
+static u_char ras_cas_tab[] = {
+       0x11, 0x14, 0x15 };
+
 void
 tseng_init(pc, tag, id, ba, fb)
        pci_chipset_tag_t       pc;
@@ -72,7 +75,7 @@
        volatile u_char         *ba;
        u_char                  *fb;
 {
-       int                     i, csr;
+       int                     i, j, csr;
        int                     is_et6000 = 0;
 
        is_et6000 = (id ==  PCI_PRODUCT_TSENG_ET6000) ? 1 : 0;
@@ -87,8 +90,26 @@
        csr |= PCI_COMMAND_MASTER_ENABLE;
        pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG, csr);
 
-       if (is_et6000)
-               et6000_init(ba, fb);
+       if (is_et6000) {
+               /*
+                * The et6[01]000 cards have MDRAM chips. The
+                * timeing to those chips is not properly initialized
+                * by the card on init. The way to determine the
+                * values is not documented either :-( So that's why
+                * all this mess below (and in et6000_init()....
+                */
+               for (i = 0; i < sizeof(ras_cas_tab); i++) {
+                       et6000_init(ba, fb, i);
+                       for (j = 0; j < 32; j++)
+                               fb[j] = j;
+                       for (j = 0; j < 32; j++)
+                               if (fb[j] != j)
+                                       break;
+                       if (j == 32)
+                               break;
+               }
+       }
+
 
        vgaw(ba, GREG_MISC_OUTPUT_W,      0x63);
        vgaw(ba, GREG_VIDEOSYSENABLE,     0x01);
@@ -140,9 +161,10 @@
  */
 
 static void
-et6000_init(ba, fb)
+et6000_init(ba, fb, iter)
 volatile u_char *ba;
 u_char         *fb;
+int            iter;
 {
 
        int             i;
@@ -158,7 +180,7 @@
        ba[0x40] = 0x06;        /* Use standard vga addressing          */
        ba[0x41] = 0x2a;        /* Performance control                  */
        ba[0x43] = 0x02;        /* XCLK/SCLK config                     */
-       ba[0x44] = 0x11;        /* RAS/CAS config                       */
+       ba[0x44] = ras_cas_tab[iter];   /* RAS/CAS config               */
        ba[0x46] = 0x00;        /* CRT display feature                  */
        ba[0x47] = 0x10;
        ba[0x58] = 0x00;        /* Video Control 1                      */
@@ -185,6 +207,5 @@
                ba[0x45] = bv | 0x70;   /* Program latency value        */
                ma[0x0] = 0;            /* Yeah, right :-(              */
                ba[0x45] = bv;          /* Back to normal               */
-               ba[0x44] = 0x14;        /* RAS/CAS config               */
        }
 }