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-rw-r--r--xorg-server/hw/xfree86/ramdac/BT.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/xorg-server/hw/xfree86/ramdac/BT.c b/xorg-server/hw/xfree86/ramdac/BT.c
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--- /dev/null
+++ b/xorg-server/hw/xfree86/ramdac/BT.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright 1998 by Alan Hourihane, Wigan, England.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of Alan Hourihane not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission. Alan Hourihane makes no representations
+ * about the suitability of this software for any purpose. It is provided
+ * "as is" without express or implied warranty.
+ *
+ * ALAN HOURIHANE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL ALAN HOURIHANE BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Authors: Alan Hourihane, <alanh@fairlite.demon.co.uk>
+ *
+ * BT RAMDAC routines.
+ */
+
+#ifdef HAVE_XORG_CONFIG_H
+#include <xorg-config.h>
+#endif
+
+#include "xf86.h"
+#include "xf86_OSproc.h"
+
+#define INIT_BT_RAMDAC_INFO
+#include "BTPriv.h"
+#include "xf86RamDacPriv.h"
+
+void
+BTramdacRestore(ScrnInfoPtr pScrn, RamDacRecPtr ramdacPtr,
+ RamDacRegRecPtr ramdacReg)
+{
+ int i;
+
+ /* Here we pass a short, so that we can evaluate a mask too */
+ /* So that the mask is the high byte and the data the low byte */
+ /* Just the command/status registers */
+ for (i=0x06;i<0x0A;i++)
+ (*ramdacPtr->WriteDAC)
+ (pScrn, i, (ramdacReg->DacRegs[i] & 0xFF00) >> 8,
+ ramdacReg->DacRegs[i]);
+}
+
+void
+BTramdacSave(ScrnInfoPtr pScrn, RamDacRecPtr ramdacPtr,
+ RamDacRegRecPtr ramdacReg)
+{
+ int i;
+
+ (*ramdacPtr->ReadAddress)(pScrn, 0); /* Start at index 0 */
+ for (i=0;i<768;i++)
+ ramdacReg->DAC[i] = (*ramdacPtr->ReadData)(pScrn);
+
+ /* Just the command/status registers */
+ for (i=0x06;i<0x0A;i++)
+ ramdacReg->DacRegs[i] = (*ramdacPtr->ReadDAC)(pScrn, i);
+}
+
+RamDacHelperRecPtr
+BTramdacProbe(ScrnInfoPtr pScrn, RamDacSupportedInfoRecPtr ramdacs/*, RamDacRecPtr ramdacPtr*/)
+{
+ RamDacRecPtr ramdacPtr = RAMDACSCRPTR(pScrn);
+ Bool RamDacIsSupported = FALSE;
+ RamDacHelperRecPtr ramdacHelperPtr = NULL;
+ int BTramdac_ID = -1;
+ int i, status, cmd0;
+
+ /* Save COMMAND Register 0 */
+ cmd0 = (*ramdacPtr->ReadDAC)(pScrn, BT_COMMAND_REG_0);
+ /* Ensure were going to access the STATUS Register on next read */
+ (*ramdacPtr->WriteDAC)(pScrn, BT_COMMAND_REG_0, 0x7F, 0x00);
+
+ status = (*ramdacPtr->ReadDAC)(pScrn, BT_STATUS_REG);
+ switch (status) {
+ case 0x40:
+ BTramdac_ID = ATT20C504_RAMDAC;
+ break;
+ case 0xD0:
+ BTramdac_ID = ATT20C505_RAMDAC;
+ break;
+ default:
+ xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
+ "Unknown BT RAMDAC type (0x%x), assuming BT485\n",
+ status);
+ case 0x80:
+ case 0x90:
+ case 0xA0:
+ case 0xB0:
+ case 0x28: /* This is for the DEC TGA - Questionable ? */
+ BTramdac_ID = BT485_RAMDAC;
+ break;
+ }
+
+ /* Restore COMMAND Register 0 */
+ (*ramdacPtr->WriteDAC)(pScrn, BT_COMMAND_REG_0, 0x00, cmd0);
+
+ if (BTramdac_ID == -1) {
+ xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
+ "Cannot determine BT RAMDAC type, aborting\n");
+ return NULL;
+ } else {
+ xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
+ "Attached RAMDAC is %s\n", BTramdacDeviceInfo[BTramdac_ID&0xFFFF].DeviceName);
+ }
+
+ for (i=0;ramdacs[i].token != -1;i++) {
+ if (ramdacs[i].token == BTramdac_ID)
+ RamDacIsSupported = TRUE;
+ }
+
+ if (!RamDacIsSupported) {
+ xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
+ "This BT RAMDAC is NOT supported by this driver, aborting\n");
+ return NULL;
+ }
+
+ ramdacHelperPtr = RamDacHelperCreateInfoRec();
+ switch(BTramdac_ID) {
+ case BT485_RAMDAC:
+ ramdacHelperPtr->SetBpp = BTramdacSetBpp;
+ break;
+ }
+ ramdacPtr->RamDacType = BTramdac_ID;
+ ramdacHelperPtr->RamDacType = BTramdac_ID;
+ ramdacHelperPtr->Save = BTramdacSave;
+ ramdacHelperPtr->Restore = BTramdacRestore;
+
+ return ramdacHelperPtr;
+}
+
+void
+BTramdacSetBpp(ScrnInfoPtr pScrn, RamDacRegRecPtr ramdacReg)
+{
+ /* We need to deal with Direct Colour visuals for 8bpp and other
+ * good stuff for colours */
+ switch (pScrn->bitsPerPixel) {
+ case 32:
+ ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x10;
+ break;
+ case 24:
+ ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x10;
+ break;
+ case 16:
+ ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x38;
+ break;
+ case 15:
+ ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x30;
+ break;
+ case 8:
+ ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x40;
+ break;
+ case 4:
+ ramdacReg->DacRegs[BT_COMMAND_REG_1] = 0x60;
+ break;
+ }
+}