1 files changed, 233 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/nv40.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/nv40.c
new file mode 100644
index 000000000..7ddd8cecb
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/nv40.c
@@ -0,0 +1,233 @@
+/*
+ * Copyright 2012 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
+ */
+#define nv40_clk(p) container_of((p), struct nv40_clk, base)
+#include "priv.h"
+#include "pll.h"
+
+#include <subdev/bios.h>
+#include <subdev/bios/pll.h>
+
+struct nv40_clk {
+	struct nvkm_clk base;
+	u32 ctrl;
+	u32 npll_ctrl;
+	u32 npll_coef;
+	u32 spll;
+};
+
+static u32
+read_pll_1(struct nv40_clk *clk, u32 reg)
+{
+	struct nvkm_device *device = clk->base.subdev.device;
+	u32 ctrl = nvkm_rd32(device, reg + 0x00);
+	int P = (ctrl & 0x00070000) >> 16;
+	int N = (ctrl & 0x0000ff00) >> 8;
+	int M = (ctrl & 0x000000ff) >> 0;
+	u32 ref = 27000, khz = 0;
+
+	if (ctrl & 0x80000000)
+		khz = ref * N / M;
+
+	return khz >> P;
+}
+
+static u32
+read_pll_2(struct nv40_clk *clk, u32 reg)
+{
+	struct nvkm_device *device = clk->base.subdev.device;
+	u32 ctrl = nvkm_rd32(device, reg + 0x00);
+	u32 coef = nvkm_rd32(device, reg + 0x04);
+	int N2 = (coef & 0xff000000) >> 24;
+	int M2 = (coef & 0x00ff0000) >> 16;
+	int N1 = (coef & 0x0000ff00) >> 8;
+	int M1 = (coef & 0x000000ff) >> 0;
+	int P = (ctrl & 0x00070000) >> 16;
+	u32 ref = 27000, khz = 0;
+
+	if ((ctrl & 0x80000000) && M1) {
+		khz = ref * N1 / M1;
+		if ((ctrl & 0x40000100) == 0x40000000) {
+			if (M2)
+				khz = khz * N2 / M2;
+			else
+				khz = 0;
+		}
+	}
+
+	return khz >> P;
+}
+
+static u32
+read_clk(struct nv40_clk *clk, u32 src)
+{
+	switch (src) {
+	case 3:
+		return read_pll_2(clk, 0x004000);
+	case 2:
+		return read_pll_1(clk, 0x004008);
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int
+nv40_clk_read(struct nvkm_clk *base, enum nv_clk_src src)
+{
+	struct nv40_clk *clk = nv40_clk(base);
+	struct nvkm_subdev *subdev = &clk->base.subdev;
+	struct nvkm_device *device = subdev->device;
+	u32 mast = nvkm_rd32(device, 0x00c040);
+
+	switch (src) {
+	case nv_clk_src_crystal:
+		return device->crystal;
+	case nv_clk_src_href:
+		return 100000; /*XXX: PCIE/AGP differ*/
+	case nv_clk_src_core:
+		return read_clk(clk, (mast & 0x00000003) >> 0);
+	case nv_clk_src_shader:
+		return read_clk(clk, (mast & 0x00000030) >> 4);
+	case nv_clk_src_mem:
+		return read_pll_2(clk, 0x4020);
+	default:
+		break;
+	}
+
+	nvkm_debug(subdev, "unknown clock source %d %08x\n", src, mast);
+	return -EINVAL;
+}
+
+static int
+nv40_clk_calc_pll(struct nv40_clk *clk, u32 reg, u32 khz,
+		  int *N1, int *M1, int *N2, int *M2, int *log2P)
+{
+	struct nvkm_subdev *subdev = &clk->base.subdev;
+	struct nvbios_pll pll;
+	int ret;
+
+	ret = nvbios_pll_parse(subdev->device->bios, reg, &pll);
+	if (ret)
+		return ret;
+
+	if (khz < pll.vco1.max_freq)
+		pll.vco2.max_freq = 0;
+
+	ret = nv04_pll_calc(subdev, &pll, khz, N1, M1, N2, M2, log2P);
+	if (ret == 0)
+		return -ERANGE;
+
+	return ret;
+}
+
+static int
+nv40_clk_calc(struct nvkm_clk *base, struct nvkm_cstate *cstate)
+{
+	struct nv40_clk *clk = nv40_clk(base);
+	int gclk = cstate->domain[nv_clk_src_core];
+	int sclk = cstate->domain[nv_clk_src_shader];
+	int N1, M1, N2, M2, log2P;
+	int ret;
+
+	/* core/geometric clock */
+	ret = nv40_clk_calc_pll(clk, 0x004000, gclk,
+				&N1, &M1, &N2, &M2, &log2P);
+	if (ret < 0)
+		return ret;
+
+	if (N2 == M2) {
+		clk->npll_ctrl = 0x80000100 | (log2P << 16);
+		clk->npll_coef = (N1 << 8) | M1;
+	} else {
+		clk->npll_ctrl = 0xc0000000 | (log2P << 16);
+		clk->npll_coef = (N2 << 24) | (M2 << 16) | (N1 << 8) | M1;
+	}
+
+	/* use the second pll for shader/rop clock, if it differs from core */
+	if (sclk && sclk != gclk) {
+		ret = nv40_clk_calc_pll(clk, 0x004008, sclk,
+					&N1, &M1, NULL, NULL, &log2P);
+		if (ret < 0)
+			return ret;
+
+		clk->spll = 0xc0000000 | (log2P << 16) | (N1 << 8) | M1;
+		clk->ctrl = 0x00000223;
+	} else {
+		clk->spll = 0x00000000;
+		clk->ctrl = 0x00000333;
+	}
+
+	return 0;
+}
+
+static int
+nv40_clk_prog(struct nvkm_clk *base)
+{
+	struct nv40_clk *clk = nv40_clk(base);
+	struct nvkm_device *device = clk->base.subdev.device;
+	nvkm_mask(device, 0x00c040, 0x00000333, 0x00000000);
+	nvkm_wr32(device, 0x004004, clk->npll_coef);
+	nvkm_mask(device, 0x004000, 0xc0070100, clk->npll_ctrl);
+	nvkm_mask(device, 0x004008, 0xc007ffff, clk->spll);
+	mdelay(5);
+	nvkm_mask(device, 0x00c040, 0x00000333, clk->ctrl);
+	return 0;
+}
+
+static void
+nv40_clk_tidy(struct nvkm_clk *obj)
+{
+}
+
+static const struct nvkm_clk_func
+nv40_clk = {
+	.read = nv40_clk_read,
+	.calc = nv40_clk_calc,
+	.prog = nv40_clk_prog,
+	.tidy = nv40_clk_tidy,
+	.domains = {
+		{ nv_clk_src_crystal, 0xff },
+		{ nv_clk_src_href   , 0xff },
+		{ nv_clk_src_core   , 0xff, 0, "core", 1000 },
+		{ nv_clk_src_shader , 0xff, 0, "shader", 1000 },
+		{ nv_clk_src_mem    , 0xff, 0, "memory", 1000 },
+		{ nv_clk_src_max }
+	}
+};
+
+int
+nv40_clk_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
+	     struct nvkm_clk **pclk)
+{
+	struct nv40_clk *clk;
+
+	if (!(clk = kzalloc(sizeof(*clk), GFP_KERNEL)))
+		return -ENOMEM;
+	clk->base.pll_calc = nv04_clk_pll_calc;
+	clk->base.pll_prog = nv04_clk_pll_prog;
+	*pclk = &clk->base;
+
+	return nvkm_clk_ctor(&nv40_clk, device, type, inst, true, &clk->base);
+}