ffb_context.c

linux-2.6.15.6

	upa_writel(ctx->auxclip1max, &ffb->auxclip[1].max);
	upa_writel(ctx->auxclip2min, &ffb->auxclip[2].min);
	upa_writel(ctx->auxclip2max, &ffb->auxclip[2].max);
	upa_writel(ctx->auxclip3min, &ffb->auxclip[3].min);
	upa_writel(ctx->auxclip3max, &ffb->auxclip[3].max);

	upa_writel(ctx->lpat, &ffb->lpat);	/* Line Pattern */
	upa_writel(ctx->fontxy, &ffb->fontxy);	/* XY Font Coordinate */
	upa_writel(ctx->fontw, &ffb->fontw);	/* Font Width */
	upa_writel(ctx->fontinc, &ffb->fontinc);	/* Font X/Y Increment */

	/* These registers/features only exist on FFB2 and later chips. */
	if (fpriv->ffb_type >= ffb2_prototype) {
		upa_writel(ctx->dcss1, &ffb->dcss1);	/* Depth Cue Scale Slope 1 */
		upa_writel(ctx->dcss2, &ffb->dcss2);	/* Depth Cue Scale Slope 2 */
		upa_writel(ctx->dcss3, &ffb->dcss2);	/* Depth Cue Scale Slope 3 */
		upa_writel(ctx->dcs2, &ffb->dcs2);	/* Depth Cue Scale 2 */
		upa_writel(ctx->dcs3, &ffb->dcs3);	/* Depth Cue Scale 3 */
		upa_writel(ctx->dcs4, &ffb->dcs4);	/* Depth Cue Scale 4 */
		upa_writel(ctx->dcd2, &ffb->dcd2);	/* Depth Cue Depth 2 */
		upa_writel(ctx->dcd3, &ffb->dcd3);	/* Depth Cue Depth 3 */
		upa_writel(ctx->dcd4, &ffb->dcd4);	/* Depth Cue Depth 4 */

		/* And stencil/stencilctl only exists on FFB2+ and later
		 * due to the introduction of 3DRAM-III.
		 */
		if (fpriv->ffb_type == ffb2_vertical_plus ||
		    fpriv->ffb_type == ffb2_horizontal_plus) {
			/* Unfortunately, there is a hardware bug on
			 * the FFB2+ chips which prevents a normal write
			 * to the stencil control register from working
			 * as it should.
			 *
			 * The state controlled by the FFB stencilctl register
			 * really gets transferred to the per-buffer instances
			 * of the stencilctl register in the 3DRAM chips.
			 *
			 * The bug is that FFB does not update buffer C correctly,
			 * so we have to do it by hand for them.
			 */

			/* This will update buffers A and B. */
			upa_writel(ctx->stencil, &ffb->stencil);
			upa_writel(ctx->stencilctl, &ffb->stencilctl);

			/* Force FFB to use buffer C 3dram regs. */
			upa_writel(0x80000000, &ffb->fbc);
			upa_writel((ctx->stencilctl | 0x80000),
				   &ffb->rawstencilctl);

			/* Now restore the correct FBC controls. */
			upa_writel(ctx->fbc, &ffb->fbc);
		}
	}

	/* Restore the 32x32 area pattern. */
	for (i = 0; i < 32; i++)
		upa_writel(ctx->area_pattern[i], &ffb->pattern[i]);

	/* Finally, stash away the User Constol/Status Register.
	 * The only state we really preserve here is the picking
	 * control.
	 */
	upa_writel((ctx->ucsr & 0xf0000), &ffb->ucsr);
}

#define FFB_UCSR_FB_BUSY       0x01000000
#define FFB_UCSR_RP_BUSY       0x02000000
#define FFB_UCSR_ALL_BUSY      (FFB_UCSR_RP_BUSY|FFB_UCSR_FB_BUSY)

static void FFBWait(ffb_fbcPtr ffb)
{
	int limit = 100000;

	do {
		u32 regval = upa_readl(&ffb->ucsr);

		if ((regval & FFB_UCSR_ALL_BUSY) == 0)
			break;
	} while (--limit);
}

int ffb_driver_context_switch(drm_device_t * dev, int old, int new)
{
	ffb_dev_priv_t *fpriv = (ffb_dev_priv_t *) dev->dev_private;

#ifdef DRM_DMA_HISTOGRAM
	dev->ctx_start = get_cycles();
#endif

	DRM_DEBUG("Context switch from %d to %d\n", old, new);

	if (new == dev->last_context || dev->last_context == 0) {
		dev->last_context = new;
		return 0;
	}

	FFBWait(fpriv->regs);
	ffb_save_context(fpriv, old);
	ffb_restore_context(fpriv, old, new);
	FFBWait(fpriv->regs);

	dev->last_context = new;

	return 0;
}

int ffb_driver_resctx(struct inode *inode, struct file *filp, unsigned int cmd,
		      unsigned long arg)
{
	drm_ctx_res_t res;
	drm_ctx_t ctx;
	int i;

	DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
	if (copy_from_user(&res, (drm_ctx_res_t __user *) arg, sizeof(res)))
		return -EFAULT;
	if (res.count >= DRM_RESERVED_CONTEXTS) {
		memset(&ctx, 0, sizeof(ctx));
		for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
			ctx.handle = i;
			if (copy_to_user(&res.contexts[i], &i, sizeof(i)))
				return -EFAULT;
		}
	}
	res.count = DRM_RESERVED_CONTEXTS;
	if (copy_to_user((drm_ctx_res_t __user *) arg, &res, sizeof(res)))
		return -EFAULT;
	return 0;
}

int ffb_driver_addctx(struct inode *inode, struct file *filp, unsigned int cmd,
		      unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->dev;
	drm_ctx_t ctx;
	int idx;

	if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
		return -EFAULT;
	idx = DRM(alloc_queue) (dev, (ctx.flags & _DRM_CONTEXT_2DONLY));
	if (idx < 0)
		return -ENFILE;

	DRM_DEBUG("%d\n", ctx.handle);
	ctx.handle = idx;
	if (copy_to_user((drm_ctx_t __user *) arg, &ctx, sizeof(ctx)))
		return -EFAULT;
	return 0;
}

int ffb_driver_modctx(struct inode *inode, struct file *filp, unsigned int cmd,
		      unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->dev;
	ffb_dev_priv_t *fpriv = (ffb_dev_priv_t *) dev->dev_private;
	struct ffb_hw_context *hwctx;
	drm_ctx_t ctx;
	int idx;

	if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
		return -EFAULT;

	idx = ctx.handle;
	if (idx <= 0 || idx >= FFB_MAX_CTXS)
		return -EINVAL;

	hwctx = fpriv->hw_state[idx - 1];
	if (hwctx == NULL)
		return -EINVAL;

	if ((ctx.flags & _DRM_CONTEXT_2DONLY) == 0)
		hwctx->is_2d_only = 0;
	else
		hwctx->is_2d_only = 1;

	return 0;
}

int ffb_driver_getctx(struct inode *inode, struct file *filp, unsigned int cmd,
		      unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->dev;
	ffb_dev_priv_t *fpriv = (ffb_dev_priv_t *) dev->dev_private;
	struct ffb_hw_context *hwctx;
	drm_ctx_t ctx;
	int idx;

	if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
		return -EFAULT;

	idx = ctx.handle;
	if (idx <= 0 || idx >= FFB_MAX_CTXS)
		return -EINVAL;

	hwctx = fpriv->hw_state[idx - 1];
	if (hwctx == NULL)
		return -EINVAL;

	if (hwctx->is_2d_only != 0)
		ctx.flags = _DRM_CONTEXT_2DONLY;
	else
		ctx.flags = 0;

	if (copy_to_user((drm_ctx_t __user *) arg, &ctx, sizeof(ctx)))
		return -EFAULT;

	return 0;
}

int ffb_driver_switchctx(struct inode *inode, struct file *filp,
			 unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->dev;
	drm_ctx_t ctx;

	if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
		return -EFAULT;
	DRM_DEBUG("%d\n", ctx.handle);
	return ffb_driver_context_switch(dev, dev->last_context, ctx.handle);
}

int ffb_driver_newctx(struct inode *inode, struct file *filp, unsigned int cmd,
		      unsigned long arg)
{
	drm_ctx_t ctx;

	if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
		return -EFAULT;
	DRM_DEBUG("%d\n", ctx.handle);

	return 0;
}

int ffb_driver_rmctx(struct inode *inode, struct file *filp, unsigned int cmd,
		     unsigned long arg)
{
	drm_ctx_t ctx;
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->dev;
	ffb_dev_priv_t *fpriv = (ffb_dev_priv_t *) dev->dev_private;
	int idx;

	if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
		return -EFAULT;
	DRM_DEBUG("%d\n", ctx.handle);

	idx = ctx.handle - 1;
	if (idx < 0 || idx >= FFB_MAX_CTXS)
		return -EINVAL;

	kfree(fpriv->hw_state[idx]);
	fpriv->hw_state[idx] = NULL;
	return 0;
}

void ffb_set_context_ioctls(void)
{
	DRM(ioctls)[DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)].func = ffb_driver_addctx;
	DRM(ioctls)[DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)].func = ffb_driver_rmctx;
	DRM(ioctls)[DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)].func = ffb_driver_modctx;
	DRM(ioctls)[DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)].func = ffb_driver_getctx;
	DRM(ioctls)[DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)].func =
	    ffb_driver_switchctx;
	DRM(ioctls)[DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)].func = ffb_driver_newctx;
	DRM(ioctls)[DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)].func = ffb_driver_resctx;

}