drivers/gpu/drm/nouveau/nv04_pm.c

   1 /*
   2  * Copyright 2010 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24
  25 #include "drmP.h"
  26 #include "nouveau_drm.h"
  27 #include "nouveau_reg.h"
  28 #include "nouveau_hw.h"
  29 #include "nouveau_pm.h"
  30
  31 #include <subdev/bios/pll.h>
  32 #include <subdev/clock.h>
  33 #include <subdev/timer.h>
  34
  35 int
  36 nv04_pm_clocks_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
  37 {
  38         int ret;
  39
  40         ret = nouveau_hw_get_clock(dev, PLL_CORE);
  41         if (ret < 0)
  42                 return ret;
  43         perflvl->core = ret;
  44
  45         ret = nouveau_hw_get_clock(dev, PLL_MEMORY);
  46         if (ret < 0)
  47                 return ret;
  48         perflvl->memory = ret;
  49
  50         return 0;
  51 }
  52
  53 struct nv04_pm_clock {
  54         struct nvbios_pll pll;
  55         struct nouveau_pll_vals calc;
  56 };
  57
  58 struct nv04_pm_state {
  59         struct nv04_pm_clock core;
  60         struct nv04_pm_clock memory;
  61 };
  62
  63 static int
  64 calc_pll(struct drm_device *dev, u32 id, int khz, struct nv04_pm_clock *clk)
  65 {
  66         struct nouveau_device *device = nouveau_dev(dev);
  67         struct nouveau_bios *bios = nouveau_bios(device);
  68         struct nouveau_clock *pclk = nouveau_clock(device);
  69         int ret;
  70
  71         ret = nvbios_pll_parse(bios, id, &clk->pll);
  72         if (ret)
  73                 return ret;
  74
  75         ret = pclk->pll_calc(pclk, &clk->pll, khz, &clk->calc);
  76         if (!ret)
  77                 return -EINVAL;
  78
  79         return 0;
  80 }
  81
  82 void *
  83 nv04_pm_clocks_pre(struct drm_device *dev, struct nouveau_pm_level *perflvl)
  84 {
  85         struct nv04_pm_state *info;
  86         int ret;
  87
  88         info = kzalloc(sizeof(*info), GFP_KERNEL);
  89         if (!info)
  90                 return ERR_PTR(-ENOMEM);
  91
  92         ret = calc_pll(dev, PLL_CORE, perflvl->core, &info->core);
  93         if (ret)
  94                 goto error;
  95
  96         if (perflvl->memory) {
  97                 ret = calc_pll(dev, PLL_MEMORY, perflvl->memory, &info->memory);
  98                 if (ret)
  99                         goto error;
 100         }
 101
 102         return info;
 103 error:
 104         kfree(info);
 105         return ERR_PTR(ret);
 106 }
 107
 108 static void
 109 prog_pll(struct drm_device *dev, struct nv04_pm_clock *clk)
 110 {
 111         struct nouveau_device *device = nouveau_dev(dev);
 112         struct nouveau_clock *pclk = nouveau_clock(device);
 113         u32 reg = clk->pll.reg;
 114
 115         /* thank the insane nouveau_hw_setpll() interface for this */
 116         if (device->card_type >= NV_40)
 117                 reg += 4;
 118
 119         pclk->pll_prog(pclk, reg, &clk->calc);
 120 }
 121
 122 int
 123 nv04_pm_clocks_set(struct drm_device *dev, void *pre_state)
 124 {
 125         struct nouveau_device *device = nouveau_dev(dev);
 126         struct nouveau_timer *ptimer = nouveau_timer(device);
 127         struct nv04_pm_state *state = pre_state;
 128
 129         prog_pll(dev, &state->core);
 130
 131         if (state->memory.pll.reg) {
 132                 prog_pll(dev, &state->memory);
 133                 if (device->card_type < NV_30) {
 134                         if (device->card_type == NV_20)
 135                                 nv_mask(device, 0x1002c4, 0, 1 << 20);
 136
 137                         /* Reset the DLLs */
 138                         nv_mask(device, 0x1002c0, 0, 1 << 8);
 139                 }
 140         }
 141
 142         nv_ofuncs(ptimer)->init(nv_object(ptimer));
 143
 144         kfree(state);
 145         return 0;
 146 }