drm/nvd0/disp: whip up some basic dma handling for the evo channels

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nvd0_display.c b/drivers/gpu/drm/nouveau/nvd0_display.c
index 6ce1529..cd827cd 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvd0_display.c
+++ b/drivers/gpu/drm/nouveau/nvd0_display.c
@@ -22,6 +22,7 @@
  * Authors: Ben Skeggs
  */
 
+#include <linux/dma-mapping.h>
 #include "drmP.h"
 
 #include "nouveau_drv.h"
@@ -31,6 +32,10 @@
 
 struct nvd0_display {
        struct nouveau_gpuobj *mem;
+       struct {
+               dma_addr_t handle;
+               u32 *ptr;
+       } evo[1];
 };
 
 static struct nvd0_display *
@@ -40,6 +45,50 @@ nvd0_display(struct drm_device *dev)
        return dev_priv->engine.display.priv;
 }
 
+static int
+evo_icmd(struct drm_device *dev, int id, u32 mthd, u32 data)
+{
+       int ret = 0;
+       nv_mask(dev, 0x610700 + (id * 0x10), 0x00000001, 0x00000001);
+       nv_wr32(dev, 0x610704 + (id * 0x10), data);
+       nv_mask(dev, 0x610704 + (id * 0x10), 0x80000ffc, 0x80000000 | mthd);
+       if (!nv_wait(dev, 0x610704 + (id * 0x10), 0x80000000, 0x00000000))
+               ret = -EBUSY;
+       nv_mask(dev, 0x610700 + (id * 0x10), 0x00000001, 0x00000000);
+       return ret;
+}
+
+static u32 *
+evo_wait(struct drm_device *dev, int id, int nr)
+{
+       struct nvd0_display *disp = nvd0_display(dev);
+       u32 put = nv_rd32(dev, 0x640000 + (id * 0x1000)) / 4;
+
+       if (put + nr >= (PAGE_SIZE / 4)) {
+               disp->evo[id].ptr[put] = 0x20000000;
+
+               nv_wr32(dev, 0x640000 + (id * 0x1000), 0x00000000);
+               if (!nv_wait(dev, 0x640004 + (id * 0x1000), ~0, 0x00000000)) {
+                       NV_ERROR(dev, "evo %d dma stalled\n", id);
+                       return NULL;
+               }
+
+               put = 0;
+       }
+
+       return disp->evo[id].ptr + put;
+}
+
+static void
+evo_kick(u32 *push, struct drm_device *dev, int id)
+{
+       struct nvd0_display *disp = nvd0_display(dev);
+       nv_wr32(dev, 0x640000 + (id * 0x1000), (push - disp->evo[id].ptr) << 2);
+}
+
+#define evo_mthd(p,m,s) *((p)++) = (((s) << 18) | (m))
+#define evo_data(p,d)   *((p)++) = (d)
+
 /******************************************************************************
  * DAC
  *****************************************************************************/
@@ -100,7 +149,7 @@ nvd0_display_init(struct drm_device *dev)
        nv_wr32(dev, 0x610010, (disp->mem->vinst >> 8) | 9);
 
        /* init master */
-       nv_wr32(dev, 0x610494, ((disp->mem->vinst + 0x1000) >> 8) | 1);
+       nv_wr32(dev, 0x610494, (disp->evo[0].handle >> 8) | 3);
        nv_wr32(dev, 0x610498, 0x00010000);
        nv_wr32(dev, 0x61049c, 0x00000000);
        nv_mask(dev, 0x610490, 0x00000010, 0x00000010);
@@ -135,11 +184,14 @@ nvd0_display_destroy(struct drm_device *dev)
 {
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvd0_display *disp = nvd0_display(dev);
+       struct pci_dev *pdev = dev->pdev;
 
        nvd0_display_fini(dev);
 
-       dev_priv->engine.display.priv = NULL;
+       pci_free_consistent(pdev, PAGE_SIZE, disp->evo[0].ptr, disp->evo[0].handle);
        nouveau_gpuobj_ref(NULL, &disp->mem);
+
+       dev_priv->engine.display.priv = NULL;
        kfree(disp);
 }
 
@@ -147,6 +199,7 @@ int
 nvd0_display_create(struct drm_device *dev)
 {
        struct drm_nouveau_private *dev_priv = dev->dev_private;
+       struct pci_dev *pdev = dev->pdev;
        struct nvd0_display *disp;
        int ret;
 
@@ -155,10 +208,19 @@ nvd0_display_create(struct drm_device *dev)
                return -ENOMEM;
        dev_priv->engine.display.priv = disp;
 
-       ret = nouveau_gpuobj_new(dev, NULL, 8 * 1024, 0x1000, 0, &disp->mem);
+       /* hash table and dma objects for the memory areas we care about */
+       ret = nouveau_gpuobj_new(dev, NULL, 4 * 1024, 0x1000, 0, &disp->mem);
        if (ret)
                goto out;
 
+       /* push buffers for evo channels */
+       disp->evo[0].ptr =
+               pci_alloc_consistent(pdev, PAGE_SIZE, &disp->evo[0].handle);
+       if (!disp->evo[0].ptr) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
        ret = nvd0_display_init(dev);
        if (ret)
                goto out;