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);