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/*
* newport.c: context switching the newport graphics card and
* newport graphics support.
*
* Author: Miguel de Icaza
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <asm/types.h>
#include <asm/gfx.h>
#include <asm/ng1.h>
#include <asm/uaccess.h>
#include <video/newport.h>
#include <linux/module.h>
struct newport_regs *npregs;
EXPORT_SYMBOL(npregs);
/* Kernel routines for supporting graphics context switching */
void newport_save (void *y)
{
newport_ctx *x = y;
newport_wait ();
#define LOAD(val) x->val = npregs->set.val;
#define LOADI(val) x->val = npregs->set.val.word;
#define LOADC(val) x->val = npregs->cset.val;
LOAD(drawmode1);
LOAD(drawmode0);
LOAD(lsmode);
LOAD(lspattern);
LOAD(lspatsave);
LOAD(zpattern);
LOAD(colorback);
LOAD(colorvram);
LOAD(alpharef);
LOAD(smask0x);
LOAD(smask0y);
LOADI(_xstart);
LOADI(_ystart);
LOADI(_xend);
LOADI(_yend);
LOAD(xsave);
LOAD(xymove);
LOADI(bresd);
LOADI(bress1);
LOAD(bresoctinc1);
LOAD(bresrndinc2);
LOAD(brese1);
LOAD(bress2);
LOAD(aweight0);
LOAD(aweight1);
LOADI(colorred);
LOADI(coloralpha);
LOADI(colorgrn);
LOADI(colorblue);
LOADI(slopered);
LOADI(slopealpha);
LOADI(slopegrn);
LOADI(slopeblue);
LOAD(wrmask);
LOAD(hostrw0);
LOAD(hostrw1);
/* configregs */
LOADC(smask1x);
LOADC(smask1y);
LOADC(smask2x);
LOADC(smask2y);
LOADC(smask3x);
LOADC(smask3y);
LOADC(smask4x);
LOADC(smask4y);
LOADC(topscan);
LOADC(xywin);
LOADC(clipmode);
LOADC(config);
/* Mhm, maybe I am missing something, but it seems that
* saving/restoring the DCB is only a matter of saving these
* registers
*/
newport_bfwait ();
LOAD (dcbmode);
newport_bfwait ();
x->dcbdata0 = npregs->set.dcbdata0.byword;
newport_bfwait ();
LOAD(dcbdata1);
}
/*
* Importat things to keep in mind when restoring the newport context:
*
* 1. slopered register is stored as a 2's complete (s12.11);
* needs to be converted to a signed magnitude (s(8)12.11).
*
* 2. xsave should be stored after xstart.
*
* 3. None of the registers should be written with the GO address.
* (read the docs for more details on this).
*/
void newport_restore (void *y)
{
newport_ctx *x = y;
#define STORE(val) npregs->set.val = x->val
#define STOREI(val) npregs->set.val.word = x->val
#define STOREC(val) npregs->cset.val = x->val
newport_wait ();
STORE(drawmode1);
STORE(drawmode0);
STORE(lsmode);
STORE(lspattern);
STORE(lspatsave);
STORE(zpattern);
STORE(colorback);
STORE(colorvram);
STORE(alpharef);
STORE(smask0x);
STORE(smask0y);
STOREI(_xstart);
STOREI(_ystart);
STOREI(_xend);
STOREI(_yend);
STORE(xsave);
STORE(xymove);
STOREI(bresd);
STOREI(bress1);
STORE(bresoctinc1);
STORE(bresrndinc2);
STORE(brese1);
STORE(bress2);
STORE(aweight0);
STORE(aweight1);
STOREI(colorred);
STOREI(coloralpha);
STOREI(colorgrn);
STOREI(colorblue);
STOREI(slopered);
STOREI(slopealpha);
STOREI(slopegrn);
STOREI(slopeblue);
STORE(wrmask);
STORE(hostrw0);
STORE(hostrw1);
/* configregs */
STOREC(smask1x);
STOREC(smask1y);
STOREC(smask2x);
STOREC(smask2y);
STOREC(smask3x);
STOREC(smask3y);
STOREC(smask4x);
STOREC(smask4y);
STOREC(topscan);
STOREC(xywin);
STOREC(clipmode);
STOREC(config);
/* FIXME: restore dcb thingies */
}
int
newport_ioctl (int card, int cmd, unsigned long arg)
{
switch (cmd){
case NG1_SETDISPLAYMODE: {
struct ng1_setdisplaymode_args request;
if (copy_from_user (&request, (void *) arg, sizeof (request)))
return -EFAULT;
newport_wait ();
newport_bfwait ();
npregs->set.dcbmode = DCB_XMAP0 | XM9_CRS_FIFO_AVAIL |
DCB_DATAWIDTH_1 | R_DCB_XMAP9_PROTOCOL;
xmap9FIFOWait (npregs);
/* FIXME: timing is wrong, just be extracted from
* the per-board timing table. I still have to figure
* out where this comes from
*
* This is used to select the protocol used to talk to
* the xmap9. For now I am using 60, selecting the
* WSLOW_DCB_XMAP9_PROTOCOL.
*
* Robert Tray comments on this issue:
*
* cfreq refers to the frequency of the monitor
* (ie. the refresh rate). Our monitors run typically
* between 60 Hz and 76 Hz. But it will be as low as
* 50 Hz if you're displaying NTSC/PAL and as high as
* 120 Hz if you are runining in stereo mode. You
* might want to try the WSLOW values.
*/
xmap9SetModeReg (npregs, request.wid, request.mode, 60);
return 0;
}
case NG1_SET_CURSOR_HOTSPOT: {
struct ng1_set_cursor_hotspot request;
if (copy_from_user (&request, (void *) arg, sizeof (request)))
return -EFAULT;
/* FIXME: make request.xhot, request.yhot the hot spot */
return 0;
}
case NG1_SETGAMMARAMP0:
/* FIXME: load the gamma ramps :-) */
return 0;
}
return -EINVAL;
}
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