1 files changed, 97 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nv50_calc.c b/drivers/gpu/drm/nouveau/nv50_calc.c
new file mode 100644
index 00000000000..8cf63a8b30c
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nv50_calc.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2010 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_hw.h"
+
+int
+nv50_calc_pll(struct drm_device *dev, struct pll_lims *pll, int clk,
+              int *N1, int *M1, int *N2, int *M2, int *P)
+{
+        struct nouveau_pll_vals pll_vals;
+        int ret;
+
+        ret = nouveau_calc_pll_mnp(dev, pll, clk, &pll_vals);
+        if (ret <= 0)
+                return ret;
+
+        *N1 = pll_vals.N1;
+        *M1 = pll_vals.M1;
+        *N2 = pll_vals.N2;
+        *M2 = pll_vals.M2;
+        *P = pll_vals.log2P;
+        return ret;
+}
+
+int
+nva3_calc_pll(struct drm_device *dev, struct pll_lims *pll, int clk,
+              int *pN, int *pfN, int *pM, int *P)
+{
+        u32 best_err = ~0, err;
+        int M, lM, hM, N, fN;
+
+        *P = pll->vco1.maxfreq / clk;
+        if (*P > pll->max_p)
+                *P = pll->max_p;
+        if (*P < pll->min_p)
+                *P = pll->min_p;
+
+        lM = (pll->refclk + pll->vco1.max_inputfreq) / pll->vco1.max_inputfreq;
+        lM = max(lM, (int)pll->vco1.min_m);
+        hM = (pll->refclk + pll->vco1.min_inputfreq) / pll->vco1.min_inputfreq;
+        hM = min(hM, (int)pll->vco1.max_m);
+
+        for (M = lM; M <= hM; M++) {
+                u32 tmp = clk * *P * M;
+                N  = tmp / pll->refclk;
+                fN = tmp % pll->refclk;
+                if (!pfN && fN >= pll->refclk / 2)
+                        N++;
+
+                if (N < pll->vco1.min_n)
+                        continue;
+                if (N > pll->vco1.max_n)
+                        break;
+
+                err = abs(clk - (pll->refclk * N / M / *P));
+                if (err < best_err) {
+                        best_err = err;
+                        *pN = N;
+                        *pM = M;
+                }
+
+                if (pfN) {
+                        *pfN = (((fN << 13) / pll->refclk) - 4096) & 0xffff;
+                        return clk;
+                }
+        }
+
+        if (unlikely(best_err == ~0)) {
+                NV_ERROR(dev, "unable to find matching pll values\n");
+                return -EINVAL;
+        }
+
+        return pll->refclk * *pN / *pM / *P;
+}