drm/nouveau/volt: add volt support for GM20B

The CVB calculation equation is the same as GK20A. Only the CVB constants
are newly added.

Signed-off-by: Vince Hsu <vinceh@nvidia.com>

4 files changed, 135 insertions, 0 deletions

diff --git a/drm/nouveau/include/nvkm/subdev/volt.h b/drm/nouveau/include/nvkm/subdev/volt.h
index ed9fb9704..9da8391e5 100644
--- a/drm/nouveau/include/nvkm/subdev/volt.h
+++ b/drm/nouveau/include/nvkm/subdev/volt.h
@@ -52,6 +52,7 @@ int  _nvkm_volt_init(struct nvkm_object *);
 
 extern struct nvkm_oclass nv40_volt_oclass;
 extern struct nvkm_oclass gk20a_volt_oclass;
+extern struct nvkm_oclass gm20b_volt_oclass;
 
 int nvkm_voltgpio_init(struct nvkm_volt *);
 int nvkm_voltgpio_get(struct nvkm_volt *);
diff --git a/drm/nouveau/nvkm/engine/device/gm100.c b/drm/nouveau/nvkm/engine/device/gm100.c
index a51b3ce50..9d6cff4e3 100644
--- a/drm/nouveau/nvkm/engine/device/gm100.c
+++ b/drm/nouveau/nvkm/engine/device/gm100.c
@@ -200,6 +200,7 @@ gm100_identify(struct nvkm_device *device)
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
 		device->oclass[NVDEV_ENGINE_GR     ] =  gm20b_gr_oclass;
 		device->oclass[NVDEV_ENGINE_CE2    ] = &gm204_ce2_oclass;
+		device->oclass[NVDEV_SUBDEV_VOLT   ] = &gm20b_volt_oclass;
 		break;
 	default:
 		nv_fatal(device, "unknown Maxwell chipset\n");
diff --git a/drm/nouveau/nvkm/subdev/volt/Kbuild b/drm/nouveau/nvkm/subdev/volt/Kbuild
index 6b46ff421..351babdc2 100644
--- a/drm/nouveau/nvkm/subdev/volt/Kbuild
+++ b/drm/nouveau/nvkm/subdev/volt/Kbuild
@@ -2,3 +2,4 @@ nvkm-y += nvkm/subdev/volt/base.o
 nvkm-y += nvkm/subdev/volt/gpio.o
 nvkm-y += nvkm/subdev/volt/nv40.o
 nvkm-y += nvkm/subdev/volt/gk20a.o
+nvkm-y += nvkm/subdev/volt/gm20b.o
diff --git a/drm/nouveau/nvkm/subdev/volt/gm20b.c b/drm/nouveau/nvkm/subdev/volt/gm20b.c
new file mode 100644
index 000000000..2a2d28f62
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/volt/gm20b.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
+ *
+ * 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+#include <subdev/volt.h>
+#ifdef __KERNEL__
+#include <nouveau_platform.h>
+#endif
+
+#include "gk20a.h"
+
+const struct cvb_coef gm20b_na_cvb_coef[] = {
+	/* KHz,         c0,     c1,   c2,    c3,     c4,   c5 */
+	/*  76800 */ {  814294, 8144, -940, 808, -21583, 226 },
+	/* 153600 */ {  856185, 8144, -940, 808, -21583, 226 },
+	/* 230400 */ {  898077, 8144, -940, 808, -21583, 226 },
+	/* 307200 */ {  939968, 8144, -940, 808, -21583, 226 },
+	/* 384000 */ {  981860, 8144, -940, 808, -21583, 226 },
+	/* 460800 */ { 1023751, 8144, -940, 808, -21583, 226 },
+	/* 537600 */ { 1065642, 8144, -940, 808, -21583, 226 },
+	/* 614400 */ { 1107534, 8144, -940, 808, -21583, 226 },
+	/* 691200 */ { 1149425, 8144, -940, 808, -21583, 226 },
+	/* 768000 */ { 1191317, 8144, -940, 808, -21583, 226 },
+	/* 844800 */ { 1233208, 8144, -940, 808, -21583, 226 },
+	/* 921600 */ { 1275100, 8144, -940, 808, -21583, 226 },
+	/* 998400 */ { 1316991, 8144, -940, 808, -21583, 226 },
+};
+
+const struct cvb_coef gm20b_cvb_coef[] = {
+	/* KHz,             c0,      c1,   c2 */
+	/*  76800 */ { 1786666,  -85625, 1632 },
+	/* 153600 */ { 1846729,  -87525, 1632 },
+	/* 230400 */ { 1910480,  -89425, 1632 },
+	/* 307200 */ { 1977920,  -91325, 1632 },
+	/* 384000 */ { 2049049,  -93215, 1632 },
+	/* 460800 */ { 2122872,  -95095, 1632 },
+	/* 537600 */ { 2201331,  -96985, 1632 },
+	/* 614400 */ { 2283479,  -98885, 1632 },
+	/* 691200 */ { 2369315, -100785, 1632 },
+	/* 768000 */ { 2458841, -102685, 1632 },
+	/* 844800 */ { 2550821, -104555, 1632 },
+	/* 921600 */ { 2647676, -106455, 1632 },
+};
+
+#define MAX_SPEEDO 4
+
+const int speedo_to_vmin[MAX_SPEEDO+1] = {
+	/*   0,      1,      2,      3,      4, */
+	950000, 840000, 800000, 840000, 800000,
+};
+
+static int
+gm20b_volt_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
+		struct nvkm_oclass *oclass, void *data, u32 size,
+		struct nvkm_object **pobject)
+{
+	struct gk20a_volt_priv *priv;
+	struct nvkm_volt *volt;
+	struct nouveau_platform_device *plat;
+	const struct cvb_coef *coef_table;
+	int i, ret, uv;
+
+	ret = nvkm_volt_create(parent, engine, oclass, &priv);
+	*pobject = nv_object(priv);
+	if (ret)
+		return ret;
+
+	volt = &priv->base;
+
+	plat = nv_device_to_platform(nv_device(parent));
+
+	if (plat->gpu_speedo_id > MAX_SPEEDO) {
+		nv_error(priv, "Unsupported Speedo = %d\n", plat->gpu_speedo_id);
+		return -EINVAL;
+	}
+
+	uv = regulator_get_voltage(plat->gpu->vdd);
+	nv_info(priv, "The default voltage is %duV\n", uv);
+
+	priv->vdd = plat->gpu->vdd;
+	priv->base.vid_get = gk20a_volt_vid_get;
+	priv->base.vid_set = gk20a_volt_vid_set;
+	priv->base.set_id = gk20a_volt_set_id;
+
+	if (plat->gpu_speedo_id >= 1) {
+		coef_table = gm20b_na_cvb_coef;
+		volt->vid_nr = ARRAY_SIZE(gm20b_na_cvb_coef);
+	} else {
+		coef_table = gm20b_cvb_coef;
+		volt->vid_nr = ARRAY_SIZE(gm20b_cvb_coef);
+	}
+	nv_debug(priv, "%s - vid_nr = %d\n", __func__, volt->vid_nr);
+	for (i = 0; i < volt->vid_nr; i++) {
+		volt->vid[i].vid = i;
+		volt->vid[i].uv = gk20a_volt_calc_voltage((coef_table + i),
+					plat->gpu_speedo_value);
+		if (volt->vid[i].uv < speedo_to_vmin[plat->gpu_speedo_id])
+			volt->vid[i].uv = speedo_to_vmin[plat->gpu_speedo_id];
+		nv_debug(priv, "%2d: vid=%d, uv=%d\n", i, volt->vid[i].vid,
+					volt->vid[i].uv);
+	}
+
+	return 0;
+}
+
+struct nvkm_oclass
+gm20b_volt_oclass = {
+	.handle = NV_SUBDEV(VOLT, 0x12b),
+	.ofuncs = &(struct nvkm_ofuncs) {
+		.ctor = gm20b_volt_ctor,
+		.dtor = _nvkm_volt_dtor,
+		.init = _nvkm_volt_init,
+		.fini = _nvkm_volt_fini,
+	},
+};