drm/gma500: Add generic pipe/crtc functions

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>

2 files changed, 340 insertions, 0 deletions

diff --git a/drivers/gpu/drm/gma500/gma_display.c b/drivers/gpu/drm/gma500/gma_display.c
index 8f66d5c6505b..297937d12fb9 100644
--- a/drivers/gpu/drm/gma500/gma_display.c
+++ b/drivers/gpu/drm/gma500/gma_display.c
@@ -24,6 +24,7 @@
 #include "psb_intel_drv.h"
 #include "psb_intel_reg.h"
 #include "psb_drv.h"
+#include "framebuffer.h"
 
 /**
  * Returns whether any output on the specified pipe is of the specified type
@@ -46,6 +47,331 @@ bool gma_pipe_has_type(struct drm_crtc *crtc, int type)
 	return false;
 }
 
+void gma_wait_for_vblank(struct drm_device *dev)
+{
+	/* Wait for 20ms, i.e. one cycle at 50hz. */
+	mdelay(20);
+}
+
+int gma_pipe_set_base(struct drm_crtc *crtc, int x, int y,
+		      struct drm_framebuffer *old_fb)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
+	struct psb_framebuffer *psbfb = to_psb_fb(crtc->fb);
+	int pipe = psb_intel_crtc->pipe;
+	const struct psb_offset *map = &dev_priv->regmap[pipe];
+	unsigned long start, offset;
+	u32 dspcntr;
+	int ret = 0;
+
+	if (!gma_power_begin(dev, true))
+		return 0;
+
+	/* no fb bound */
+	if (!crtc->fb) {
+		dev_err(dev->dev, "No FB bound\n");
+		goto gma_pipe_cleaner;
+	}
+
+	/* We are displaying this buffer, make sure it is actually loaded
+	   into the GTT */
+	ret = psb_gtt_pin(psbfb->gtt);
+	if (ret < 0)
+		goto gma_pipe_set_base_exit;
+	start = psbfb->gtt->offset;
+	offset = y * crtc->fb->pitches[0] + x * (crtc->fb->bits_per_pixel / 8);
+
+	REG_WRITE(map->stride, crtc->fb->pitches[0]);
+
+	dspcntr = REG_READ(map->cntr);
+	dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
+
+	switch (crtc->fb->bits_per_pixel) {
+	case 8:
+		dspcntr |= DISPPLANE_8BPP;
+		break;
+	case 16:
+		if (crtc->fb->depth == 15)
+			dspcntr |= DISPPLANE_15_16BPP;
+		else
+			dspcntr |= DISPPLANE_16BPP;
+		break;
+	case 24:
+	case 32:
+		dspcntr |= DISPPLANE_32BPP_NO_ALPHA;
+		break;
+	default:
+		dev_err(dev->dev, "Unknown color depth\n");
+		ret = -EINVAL;
+		goto gma_pipe_set_base_exit;
+	}
+	REG_WRITE(map->cntr, dspcntr);
+
+	dev_dbg(dev->dev,
+		"Writing base %08lX %08lX %d %d\n", start, offset, x, y);
+
+	/* FIXME: Investigate whether this really is the base for psb and why
+		  the linear offset is named base for the other chips. map->surf
+		  should be the base and map->linoff the offset for all chips */
+	if (IS_PSB(dev)) {
+		REG_WRITE(map->base, offset + start);
+		REG_READ(map->base);
+	} else {
+		REG_WRITE(map->base, offset);
+		REG_READ(map->base);
+		REG_WRITE(map->surf, start);
+		REG_READ(map->surf);
+	}
+
+gma_pipe_cleaner:
+	/* If there was a previous display we can now unpin it */
+	if (old_fb)
+		psb_gtt_unpin(to_psb_fb(old_fb)->gtt);
+
+gma_pipe_set_base_exit:
+	gma_power_end(dev);
+	return ret;
+}
+
+/* Loads the palette/gamma unit for the CRTC with the prepared values */
+void gma_crtc_load_lut(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
+	const struct psb_offset *map = &dev_priv->regmap[psb_intel_crtc->pipe];
+	int palreg = map->palette;
+	int i;
+
+	/* The clocks have to be on to load the palette. */
+	if (!crtc->enabled)
+		return;
+
+	if (gma_power_begin(dev, false)) {
+		for (i = 0; i < 256; i++) {
+			REG_WRITE(palreg + 4 * i,
+				  ((psb_intel_crtc->lut_r[i] +
+				  psb_intel_crtc->lut_adj[i]) << 16) |
+				  ((psb_intel_crtc->lut_g[i] +
+				  psb_intel_crtc->lut_adj[i]) << 8) |
+				  (psb_intel_crtc->lut_b[i] +
+				  psb_intel_crtc->lut_adj[i]));
+		}
+		gma_power_end(dev);
+	} else {
+		for (i = 0; i < 256; i++) {
+			/* FIXME: Why pipe[0] and not pipe[..._crtc->pipe]? */
+			dev_priv->regs.pipe[0].palette[i] =
+				  ((psb_intel_crtc->lut_r[i] +
+				  psb_intel_crtc->lut_adj[i]) << 16) |
+				  ((psb_intel_crtc->lut_g[i] +
+				  psb_intel_crtc->lut_adj[i]) << 8) |
+				  (psb_intel_crtc->lut_b[i] +
+				  psb_intel_crtc->lut_adj[i]);
+		}
+
+	}
+}
+
+void gma_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green, u16 *blue,
+			u32 start, u32 size)
+{
+	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
+	int i;
+	int end = (start + size > 256) ? 256 : start + size;
+
+	for (i = start; i < end; i++) {
+		psb_intel_crtc->lut_r[i] = red[i] >> 8;
+		psb_intel_crtc->lut_g[i] = green[i] >> 8;
+		psb_intel_crtc->lut_b[i] = blue[i] >> 8;
+	}
+
+	gma_crtc_load_lut(crtc);
+}
+
+/**
+ * Sets the power management mode of the pipe and plane.
+ *
+ * This code should probably grow support for turning the cursor off and back
+ * on appropriately at the same time as we're turning the pipe off/on.
+ */
+void gma_crtc_dpms(struct drm_crtc *crtc, int mode)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
+	int pipe = psb_intel_crtc->pipe;
+	const struct psb_offset *map = &dev_priv->regmap[pipe];
+	u32 temp;
+
+	/* XXX: When our outputs are all unaware of DPMS modes other than off
+	 * and on, we should map those modes to DRM_MODE_DPMS_OFF in the CRTC.
+	 */
+
+	/* FIXME: Uncomment this when we move cdv to generic dpms
+	if (IS_CDV(dev))
+		cdv_intel_disable_self_refresh(dev);
+	*/
+
+	switch (mode) {
+	case DRM_MODE_DPMS_ON:
+	case DRM_MODE_DPMS_STANDBY:
+	case DRM_MODE_DPMS_SUSPEND:
+		if (psb_intel_crtc->active)
+			break;
+
+		psb_intel_crtc->active = true;
+
+		/* Enable the DPLL */
+		temp = REG_READ(map->dpll);
+		if ((temp & DPLL_VCO_ENABLE) == 0) {
+			REG_WRITE(map->dpll, temp);
+			REG_READ(map->dpll);
+			/* Wait for the clocks to stabilize. */
+			udelay(150);
+			REG_WRITE(map->dpll, temp | DPLL_VCO_ENABLE);
+			REG_READ(map->dpll);
+			/* Wait for the clocks to stabilize. */
+			udelay(150);
+			REG_WRITE(map->dpll, temp | DPLL_VCO_ENABLE);
+			REG_READ(map->dpll);
+			/* Wait for the clocks to stabilize. */
+			udelay(150);
+		}
+
+		/* Enable the plane */
+		temp = REG_READ(map->cntr);
+		if ((temp & DISPLAY_PLANE_ENABLE) == 0) {
+			REG_WRITE(map->cntr,
+				  temp | DISPLAY_PLANE_ENABLE);
+			/* Flush the plane changes */
+			REG_WRITE(map->base, REG_READ(map->base));
+		}
+
+		udelay(150);
+
+		/* Enable the pipe */
+		temp = REG_READ(map->conf);
+		if ((temp & PIPEACONF_ENABLE) == 0)
+			REG_WRITE(map->conf, temp | PIPEACONF_ENABLE);
+
+		temp = REG_READ(map->status);
+		temp &= ~(0xFFFF);
+		temp |= PIPE_FIFO_UNDERRUN;
+		REG_WRITE(map->status, temp);
+		REG_READ(map->status);
+
+		gma_crtc_load_lut(crtc);
+
+		/* Give the overlay scaler a chance to enable
+		 * if it's on this pipe */
+		/* psb_intel_crtc_dpms_video(crtc, true); TODO */
+		break;
+	case DRM_MODE_DPMS_OFF:
+		if (!psb_intel_crtc->active)
+			break;
+
+		psb_intel_crtc->active = false;
+
+		/* Give the overlay scaler a chance to disable
+		 * if it's on this pipe */
+		/* psb_intel_crtc_dpms_video(crtc, FALSE); TODO */
+
+		/* Disable the VGA plane that we never use */
+		REG_WRITE(VGACNTRL, VGA_DISP_DISABLE);
+
+		/* Turn off vblank interrupts */
+		drm_vblank_off(dev, pipe);
+
+		/* Wait for vblank for the disable to take effect */
+		gma_wait_for_vblank(dev);
+
+		/* Disable plane */
+		temp = REG_READ(map->cntr);
+		if ((temp & DISPLAY_PLANE_ENABLE) != 0) {
+			REG_WRITE(map->cntr,
+				  temp & ~DISPLAY_PLANE_ENABLE);
+			/* Flush the plane changes */
+			REG_WRITE(map->base, REG_READ(map->base));
+			REG_READ(map->base);
+		}
+
+		/* Disable pipe */
+		temp = REG_READ(map->conf);
+		if ((temp & PIPEACONF_ENABLE) != 0) {
+			REG_WRITE(map->conf, temp & ~PIPEACONF_ENABLE);
+			REG_READ(map->conf);
+		}
+
+		/* Wait for vblank for the disable to take effect. */
+		gma_wait_for_vblank(dev);
+
+		udelay(150);
+
+		/* Disable DPLL */
+		temp = REG_READ(map->dpll);
+		if ((temp & DPLL_VCO_ENABLE) != 0) {
+			REG_WRITE(map->dpll, temp & ~DPLL_VCO_ENABLE);
+			REG_READ(map->dpll);
+		}
+
+		/* Wait for the clocks to turn off. */
+		udelay(150);
+		break;
+	}
+
+	/* FIXME: Uncomment this when we move cdv to generic dpms
+	if (IS_CDV(dev))
+		cdv_intel_update_watermark(dev, crtc);
+	*/
+
+	/* Set FIFO watermarks */
+	REG_WRITE(DSPARB, 0x3F3E);
+}
+
+bool gma_crtc_mode_fixup(struct drm_crtc *crtc,
+			 const struct drm_display_mode *mode,
+			 struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+void gma_crtc_prepare(struct drm_crtc *crtc)
+{
+	struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+	crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
+}
+
+void gma_crtc_commit(struct drm_crtc *crtc)
+{
+	struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+	crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
+}
+
+void gma_crtc_disable(struct drm_crtc *crtc)
+{
+	struct gtt_range *gt;
+	struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+
+	crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
+
+	if (crtc->fb) {
+		gt = to_psb_fb(crtc->fb)->gtt;
+		psb_gtt_unpin(gt);
+	}
+}
+
+void gma_crtc_destroy(struct drm_crtc *crtc)
+{
+	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
+
+	kfree(psb_intel_crtc->crtc_state);
+	drm_crtc_cleanup(crtc);
+	kfree(psb_intel_crtc);
+}
+
 #define GMA_PLL_INVALID(s) { /* DRM_ERROR(s); */ return false; }
 
 bool gma_pll_is_valid(struct drm_crtc *crtc,
diff --git a/drivers/gpu/drm/gma500/gma_display.h b/drivers/gpu/drm/gma500/gma_display.h
index a5d8aa31b5b7..24a582e009e6 100644
--- a/drivers/gpu/drm/gma500/gma_display.h
+++ b/drivers/gpu/drm/gma500/gma_display.h
@@ -61,6 +61,20 @@ struct gma_clock_funcs {
 
 /* Common pipe related functions */
 extern bool gma_pipe_has_type(struct drm_crtc *crtc, int type);
+extern void gma_wait_for_vblank(struct drm_device *dev);
+extern int gma_pipe_set_base(struct drm_crtc *crtc, int x, int y,
+			     struct drm_framebuffer *old_fb);
+extern void gma_crtc_load_lut(struct drm_crtc *crtc);
+extern void gma_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
+			       u16 *blue, u32 start, u32 size);
+extern void gma_crtc_dpms(struct drm_crtc *crtc, int mode);
+extern bool gma_crtc_mode_fixup(struct drm_crtc *crtc,
+				const struct drm_display_mode *mode,
+				struct drm_display_mode *adjusted_mode);
+extern void gma_crtc_prepare(struct drm_crtc *crtc);
+extern void gma_crtc_commit(struct drm_crtc *crtc);
+extern void gma_crtc_disable(struct drm_crtc *crtc);
+extern void gma_crtc_destroy(struct drm_crtc *crtc);
 
 /* Common clock related functions */
 extern const struct gma_limit_t *gma_limit(struct drm_crtc *crtc, int refclk);