drm/nvc0/pm: initial implementation of clocks_get()

Not too certain on memory clock yet, but it gets the right numbers for
each perflvl on my NVC0.

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

1 files changed, 145 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvc0_pm.c b/drivers/gpu/drm/nouveau/nvc0_pm.c
new file mode 100644
index 000000000000..aff4426b2408
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvc0_pm.c
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2011 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+
+#include "drmP.h"
+#include "nouveau_drv.h"
+#include "nouveau_bios.h"
+#include "nouveau_pm.h"
+
+static u32 read_div(struct drm_device *, int, u32, u32);
+static u32 read_pll(struct drm_device *, u32);
+
+static u32
+read_vco(struct drm_device *dev, u32 dsrc)
+{
+        u32 ssrc = nv_rd32(dev, dsrc);
+        if (!(ssrc & 0x00000100))
+                return read_pll(dev, 0x00e800);
+        return read_pll(dev, 0x00e820);
+}
+
+static u32
+read_pll(struct drm_device *dev, u32 pll)
+{
+        u32 coef = nv_rd32(dev, pll + 4);
+        u32 P = (coef & 0x003f0000) >> 16;
+        u32 N = (coef & 0x0000ff00) >> 8;
+        u32 M = (coef & 0x000000ff) >> 0;
+        u32 sclk, doff;
+
+        switch (pll & 0xfff000) {
+        case 0x00e000:
+                sclk = 27000;
+                P = 1;
+                break;
+        case 0x137000:
+                doff = (pll - 0x137000) / 0x20;
+                sclk = read_div(dev, doff, 0x137120, 0x137140);
+                break;
+        case 0x132000:
+                switch (pll) {
+                case 0x132000:
+                        sclk = read_pll(dev, 0x132020);
+                        break;
+                case 0x132020:
+                        sclk = read_div(dev, 0, 0x137320, 0x137330);
+                        break;
+                default:
+                        return 0;
+                }
+                break;
+        default:
+                return 0;
+        }
+
+        return sclk * N / M / P;
+}
+
+static u32
+read_div(struct drm_device *dev, int doff, u32 dsrc, u32 dctl)
+{
+        u32 ssrc = nv_rd32(dev, dsrc + (doff * 4));
+        u32 sctl = nv_rd32(dev, dctl + (doff * 4));
+
+        switch (ssrc & 0x00000003) {
+        case 0:
+                if ((ssrc & 0x00030000) != 0x00030000)
+                        return 27000;
+                return 108000;
+        case 2:
+                return 100000;
+        case 3:
+                if (sctl & 0x80000000) {
+                        u32 sclk = read_vco(dev, dsrc);
+                        u32 sdiv = (sctl & 0x0000003f) + 2;
+                        return (sclk * 2) / sdiv;
+                }
+
+                return read_vco(dev, dsrc);
+        default:
+                return 0;
+        }
+}
+
+static u32
+read_mem(struct drm_device *dev)
+{
+        u32 ssel = nv_rd32(dev, 0x1373f0);
+        if (ssel & 0x00000001)
+                return read_div(dev, 0, 0x137300, 0x137310);
+        return read_pll(dev, 0x132000);
+}
+
+static u32
+read_clk(struct drm_device *dev, int clk)
+{
+        u32 sctl = nv_rd32(dev, 0x137250 + (clk * 4));
+        u32 ssel = nv_rd32(dev, 0x137100);
+        u32 sclk, sdiv;
+
+        if (ssel & (1 << clk)) {
+                if (clk < 7)
+                        sclk = read_pll(dev, 0x137000 + (clk * 0x20));
+                else
+                        sclk = read_pll(dev, 0x1370e0);
+                sdiv = ((sctl & 0x00003f00) >> 8) + 2;
+        } else {
+                sclk = read_div(dev, clk, 0x137160, 0x1371d0);
+                sdiv = ((sctl & 0x0000003f) >> 0) + 2;
+        }
+
+        if (sctl & 0x80000000)
+                return (sclk * 2) / sdiv;
+        return sclk;
+}
+
+int
+nvc0_pm_clocks_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
+{
+        perflvl->shader = read_clk(dev, 0x00);
+        perflvl->core   = perflvl->shader / 2;
+        perflvl->memory = read_mem(dev);
+        perflvl->vdec   = read_clk(dev, 0x0e);
+        return 0;
+}