drm/nv04-nv40: import initial pm backend

Currently just hooked up to the already-existing nouveau_hw, which should
handle all relevant chipsets as well as we currently can.

This will likely be eventually split out and improved into chipset specific
code at a later point.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/Makefile

@@ -25,7 +25,7 @@ nouveau-y := nouveau_drv.o nouveau_state.o nouveau_channel.o nouveau_mem.o \
              nv04_crtc.o nv04_display.o nv04_cursor.o nv04_fbcon.o \
              nv10_gpio.o nv50_gpio.o \
 	     nv50_calc.o \
-	     nv50_pm.o
+	     nv04_pm.o nv50_pm.o
 
 nouveau-$(CONFIG_DRM_NOUVEAU_DEBUG) += nouveau_debugfs.o
 nouveau-$(CONFIG_COMPAT) += nouveau_ioc32.o

drivers/gpu/drm/nouveau/nouveau_hw.c

@@ -431,7 +431,8 @@ nouveau_hw_get_pllvals(struct drm_device *dev, enum pll_types plltype,
 	struct pll_lims pll_lim;
 	int ret;
 
-	BUG_ON(reg1 == 0);
+	if (reg1 == 0)
+		return -ENOENT;
 
 	pll1 = nvReadMC(dev, reg1);
 
@@ -480,6 +481,7 @@ int
 nouveau_hw_get_clock(struct drm_device *dev, enum pll_types plltype)
 {
 	struct nouveau_pll_vals pllvals;
+	int ret;
 
 	if (plltype == PLL_MEMORY &&
 	    (dev->pci_device & 0x0ff0) == CHIPSET_NFORCE) {
@@ -499,7 +501,9 @@ nouveau_hw_get_clock(struct drm_device *dev, enum pll_types plltype)
 		return clock;
 	}
 
-	nouveau_hw_get_pllvals(dev, plltype, &pllvals);
+	ret = nouveau_hw_get_pllvals(dev, plltype, &pllvals);
+	if (ret)
+		return ret;
 
 	return nouveau_hw_pllvals_to_clk(&pllvals);
 }

drivers/gpu/drm/nouveau/nouveau_pm.h

@@ -41,6 +41,11 @@ int  nouveau_voltage_gpio_set(struct drm_device *, int voltage);
 void nouveau_perf_init(struct drm_device *);
 void nouveau_perf_fini(struct drm_device *);
 
+/* nv04_pm.c */
+int nv04_pm_clock_get(struct drm_device *, u32 id);
+void *nv04_pm_clock_pre(struct drm_device *, u32 id, int khz);
+void nv04_pm_clock_set(struct drm_device *, void *);
+
 /* nv50_pm.c */
 int nv50_pm_clock_get(struct drm_device *, u32 id);
 void *nv50_pm_clock_pre(struct drm_device *, u32 id, int khz);

drivers/gpu/drm/nouveau/nouveau_state.c

@@ -96,6 +96,9 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
 		engine->gpio.get		= NULL;
 		engine->gpio.set		= NULL;
 		engine->gpio.irq_enable		= NULL;
+		engine->pm.clock_get		= nv04_pm_clock_get;
+		engine->pm.clock_pre		= nv04_pm_clock_pre;
+		engine->pm.clock_set		= nv04_pm_clock_set;
 		break;
 	case 0x10:
 		engine->instmem.init		= nv04_instmem_init;
@@ -147,6 +150,9 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
 		engine->gpio.get		= nv10_gpio_get;
 		engine->gpio.set		= nv10_gpio_set;
 		engine->gpio.irq_enable		= NULL;
+		engine->pm.clock_get		= nv04_pm_clock_get;
+		engine->pm.clock_pre		= nv04_pm_clock_pre;
+		engine->pm.clock_set		= nv04_pm_clock_set;
 		break;
 	case 0x20:
 		engine->instmem.init		= nv04_instmem_init;
@@ -198,6 +204,9 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
 		engine->gpio.get		= nv10_gpio_get;
 		engine->gpio.set		= nv10_gpio_set;
 		engine->gpio.irq_enable		= NULL;
+		engine->pm.clock_get		= nv04_pm_clock_get;
+		engine->pm.clock_pre		= nv04_pm_clock_pre;
+		engine->pm.clock_set		= nv04_pm_clock_set;
 		break;
 	case 0x30:
 		engine->instmem.init		= nv04_instmem_init;
@@ -249,6 +258,11 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
 		engine->gpio.get		= nv10_gpio_get;
 		engine->gpio.set		= nv10_gpio_set;
 		engine->gpio.irq_enable		= NULL;
+		engine->pm.clock_get		= nv04_pm_clock_get;
+		engine->pm.clock_pre		= nv04_pm_clock_pre;
+		engine->pm.clock_set		= nv04_pm_clock_set;
+		engine->pm.voltage_get		= nouveau_voltage_gpio_get;
+		engine->pm.voltage_set		= nouveau_voltage_gpio_set;
 		break;
 	case 0x40:
 	case 0x60:
@@ -301,6 +315,11 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
 		engine->gpio.get		= nv10_gpio_get;
 		engine->gpio.set		= nv10_gpio_set;
 		engine->gpio.irq_enable		= NULL;
+		engine->pm.clock_get		= nv04_pm_clock_get;
+		engine->pm.clock_pre		= nv04_pm_clock_pre;
+		engine->pm.clock_set		= nv04_pm_clock_set;
+		engine->pm.voltage_get		= nouveau_voltage_gpio_get;
+		engine->pm.voltage_set		= nouveau_voltage_gpio_set;
 		break;
 	case 0x50:
 	case 0x80: /* gotta love NVIDIA's consistency.. */

drivers/gpu/drm/nouveau/nv04_pm.c

+/*
+ * 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"
+
+struct nv04_pm_state {
+	struct pll_lims pll;
+	struct nouveau_pll_vals calc;
+};
+
+int
+nv04_pm_clock_get(struct drm_device *dev, u32 id)
+{
+	return nouveau_hw_get_clock(dev, id);
+}
+
+void *
+nv04_pm_clock_pre(struct drm_device *dev, u32 id, int khz)
+{
+	struct nv04_pm_state *state;
+	int ret;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return ERR_PTR(-ENOMEM);
+
+	ret = get_pll_limits(dev, id, &state->pll);
+	if (ret) {
+		kfree(state);
+		return ERR_PTR(ret);
+	}
+
+	ret = nouveau_calc_pll_mnp(dev, &state->pll, khz, &state->calc);
+	if (!ret) {
+		kfree(state);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return state;
+}
+
+void
+nv04_pm_clock_set(struct drm_device *dev, void *pre_state)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct nv04_pm_state *state = pre_state;
+	u32 reg = state->pll.reg;
+
+	/* thank the insane nouveau_hw_setpll() interface for this */
+	if (dev_priv->card_type >= NV_40)
+		reg += 4;
+
+	nouveau_hw_setpll(dev, reg, &state->calc);
+	kfree(state);
+}
+