drivers/video/geode/suspend_gx.c

   1 /*
   2  *   Copyright (C) 2007 Advanced Micro Devices, Inc.
   3  *   Copyright (C) 2008 Andres Salomon <dilinger@debian.org>
   4  *
   5  *   This program is free software; you can redistribute it and/or modify it
   6  *   under the terms of the GNU General Public License as published by the
   7  *   Free Software Foundation; either version 2 of the License, or (at your
   8  *   option) any later version.
   9  */
  10 #include <linux/fb.h>
  11 #include <asm/io.h>
  12 #include <asm/msr.h>
  13 #include <asm/geode.h>
  14 #include <asm/delay.h>
  15
  16 #include "gxfb.h"
  17
  18 #ifdef CONFIG_PM
  19
  20 static void gx_save_regs(struct gxfb_par *par)
  21 {
  22         int i;
  23
  24         /* wait for the BLT engine to stop being busy */
  25         do {
  26                 i = read_gp(par, GP_BLT_STATUS);
  27         } while (i & (GP_BLT_STATUS_BLT_PENDING | GP_BLT_STATUS_BLT_BUSY));
  28
  29         /* save MSRs */
  30         rdmsrl(MSR_GX_MSR_PADSEL, par->msr.padsel);
  31         rdmsrl(MSR_GLCP_DOTPLL, par->msr.dotpll);
  32
  33         write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
  34
  35         /* save registers */
  36         memcpy(par->gp, par->gp_regs, sizeof(par->gp));
  37         memcpy(par->dc, par->dc_regs, sizeof(par->dc));
  38         memcpy(par->vp, par->vid_regs, sizeof(par->vp));
  39         memcpy(par->fp, par->vid_regs + VP_FP_START, sizeof(par->fp));
  40
  41         /* save the palette */
  42         write_dc(par, DC_PAL_ADDRESS, 0);
  43         for (i = 0; i < ARRAY_SIZE(par->pal); i++)
  44                 par->pal[i] = read_dc(par, DC_PAL_DATA);
  45 }
  46
  47 static void gx_set_dotpll(uint32_t dotpll_hi)
  48 {
  49         uint32_t dotpll_lo;
  50         int i;
  51
  52         rdmsrl(MSR_GLCP_DOTPLL, dotpll_lo);
  53         dotpll_lo |= MSR_GLCP_DOTPLL_DOTRESET;
  54         dotpll_lo &= ~MSR_GLCP_DOTPLL_BYPASS;
  55         wrmsr(MSR_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
  56
  57         /* wait for the PLL to lock */
  58         for (i = 0; i < 200; i++) {
  59                 rdmsrl(MSR_GLCP_DOTPLL, dotpll_lo);
  60                 if (dotpll_lo & MSR_GLCP_DOTPLL_LOCK)
  61                         break;
  62                 udelay(1);
  63         }
  64
  65         /* PLL set, unlock */
  66         dotpll_lo &= ~MSR_GLCP_DOTPLL_DOTRESET;
  67         wrmsr(MSR_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
  68 }
  69
  70 static void gx_restore_gfx_proc(struct gxfb_par *par)
  71 {
  72         int i;
  73
  74         for (i = 0; i < ARRAY_SIZE(par->gp); i++) {
  75                 switch (i) {
  76                 case GP_VECTOR_MODE:
  77                 case GP_BLT_MODE:
  78                 case GP_BLT_STATUS:
  79                 case GP_HST_SRC:
  80                         /* don't restore these registers */
  81                         break;
  82                 default:
  83                         write_gp(par, i, par->gp[i]);
  84                 }
  85         }
  86 }
  87
  88 static void gx_restore_display_ctlr(struct gxfb_par *par)
  89 {
  90         int i;
  91
  92         for (i = 0; i < ARRAY_SIZE(par->dc); i++) {
  93                 switch (i) {
  94                 case DC_UNLOCK:
  95                         /* unlock the DC; runs first */
  96                         write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
  97                         break;
  98
  99                 case DC_GENERAL_CFG:
 100                         /* write without the enables */
 101                         write_dc(par, i, par->dc[i] & ~(DC_GENERAL_CFG_VIDE |
 102                                         DC_GENERAL_CFG_ICNE |
 103                                         DC_GENERAL_CFG_CURE |
 104                                         DC_GENERAL_CFG_DFLE));
 105                         break;
 106
 107                 case DC_DISPLAY_CFG:
 108                         /* write without the enables */
 109                         write_dc(par, i, par->dc[i] & ~(DC_DISPLAY_CFG_VDEN |
 110                                         DC_DISPLAY_CFG_GDEN |
 111                                         DC_DISPLAY_CFG_TGEN));
 112                         break;
 113
 114                 case DC_RSVD_0:
 115                 case DC_RSVD_1:
 116                 case DC_RSVD_2:
 117                 case DC_RSVD_3:
 118                 case DC_RSVD_4:
 119                 case DC_LINE_CNT:
 120                 case DC_PAL_ADDRESS:
 121                 case DC_PAL_DATA:
 122                 case DC_DFIFO_DIAG:
 123                 case DC_CFIFO_DIAG:
 124                 case DC_RSVD_5:
 125                         /* don't restore these registers */
 126                         break;
 127                 default:
 128                         write_dc(par, i, par->dc[i]);
 129                 }
 130         }
 131
 132         /* restore the palette */
 133         write_dc(par, DC_PAL_ADDRESS, 0);
 134         for (i = 0; i < ARRAY_SIZE(par->pal); i++)
 135                 write_dc(par, DC_PAL_DATA, par->pal[i]);
 136 }
 137
 138 static void gx_restore_video_proc(struct gxfb_par *par)
 139 {
 140         int i;
 141
 142         wrmsrl(MSR_GX_MSR_PADSEL, par->msr.padsel);
 143
 144         for (i = 0; i < ARRAY_SIZE(par->vp); i++) {
 145                 switch (i) {
 146                 case VP_VCFG:
 147                         /* don't enable video yet */
 148                         write_vp(par, i, par->vp[i] & ~VP_VCFG_VID_EN);
 149                         break;
 150
 151                 case VP_DCFG:
 152                         /* don't enable CRT yet */
 153                         write_vp(par, i, par->vp[i] &
 154                                         ~(VP_DCFG_DAC_BL_EN | VP_DCFG_VSYNC_EN |
 155                                         VP_DCFG_HSYNC_EN | VP_DCFG_CRT_EN));
 156                         break;
 157
 158                 case VP_GAR:
 159                 case VP_GDR:
 160                 case VP_RSVD_0:
 161                 case VP_RSVD_1:
 162                 case VP_RSVD_2:
 163                 case VP_RSVD_3:
 164                 case VP_CRC32:
 165                 case VP_AWT:
 166                 case VP_VTM:
 167                         /* don't restore these registers */
 168                         break;
 169                 default:
 170                         write_vp(par, i, par->vp[i]);
 171                 }
 172         }
 173 }
 174
 175 static void gx_restore_regs(struct gxfb_par *par)
 176 {
 177         int i;
 178
 179         gx_set_dotpll((uint32_t) (par->msr.dotpll >> 32));
 180         gx_restore_gfx_proc(par);
 181         gx_restore_display_ctlr(par);
 182         gx_restore_video_proc(par);
 183
 184         /* Flat Panel */
 185         for (i = 0; i < ARRAY_SIZE(par->fp); i++) {
 186                 if (i != FP_PM && i != FP_RSVD_0)
 187                         write_fp(par, i, par->fp[i]);
 188         }
 189 }
 190
 191 static void gx_disable_graphics(struct gxfb_par *par)
 192 {
 193         /* shut down the engine */
 194         write_vp(par, VP_VCFG, par->vp[VP_VCFG] & ~VP_VCFG_VID_EN);
 195         write_vp(par, VP_DCFG, par->vp[VP_DCFG] & ~(VP_DCFG_DAC_BL_EN |
 196                         VP_DCFG_VSYNC_EN | VP_DCFG_HSYNC_EN | VP_DCFG_CRT_EN));
 197
 198         /* turn off the flat panel */
 199         write_fp(par, FP_PM, par->fp[FP_PM] & ~FP_PM_P);
 200
 201
 202         /* turn off display */
 203         write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
 204         write_dc(par, DC_GENERAL_CFG, par->dc[DC_GENERAL_CFG] &
 205                         ~(DC_GENERAL_CFG_VIDE | DC_GENERAL_CFG_ICNE |
 206                         DC_GENERAL_CFG_CURE | DC_GENERAL_CFG_DFLE));
 207         write_dc(par, DC_DISPLAY_CFG, par->dc[DC_DISPLAY_CFG] &
 208                         ~(DC_DISPLAY_CFG_VDEN | DC_DISPLAY_CFG_GDEN |
 209                         DC_DISPLAY_CFG_TGEN));
 210         write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
 211 }
 212
 213 static void gx_enable_graphics(struct gxfb_par *par)
 214 {
 215         uint32_t fp;
 216
 217         fp = read_fp(par, FP_PM);
 218         if (par->fp[FP_PM] & FP_PM_P) {
 219                 /* power on the panel if not already power{ed,ing} on */
 220                 if (!(fp & (FP_PM_PANEL_ON|FP_PM_PANEL_PWR_UP)))
 221                         write_fp(par, FP_PM, par->fp[FP_PM]);
 222         } else {
 223                 /* power down the panel if not already power{ed,ing} down */
 224                 if (!(fp & (FP_PM_PANEL_OFF|FP_PM_PANEL_PWR_DOWN)))
 225                         write_fp(par, FP_PM, par->fp[FP_PM]);
 226         }
 227
 228         /* turn everything on */
 229         write_vp(par, VP_VCFG, par->vp[VP_VCFG]);
 230         write_vp(par, VP_DCFG, par->vp[VP_DCFG]);
 231         write_dc(par, DC_DISPLAY_CFG, par->dc[DC_DISPLAY_CFG]);
 232         /* do this last; it will enable the FIFO load */
 233         write_dc(par, DC_GENERAL_CFG, par->dc[DC_GENERAL_CFG]);
 234
 235         /* lock the door behind us */
 236         write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
 237 }
 238
 239 int gx_powerdown(struct fb_info *info)
 240 {
 241         struct gxfb_par *par = info->par;
 242
 243         if (par->powered_down)
 244                 return 0;
 245
 246         gx_save_regs(par);
 247         gx_disable_graphics(par);
 248
 249         par->powered_down = 1;
 250         return 0;
 251 }
 252
 253 int gx_powerup(struct fb_info *info)
 254 {
 255         struct gxfb_par *par = info->par;
 256
 257         if (!par->powered_down)
 258                 return 0;
 259
 260         gx_restore_regs(par);
 261         gx_enable_graphics(par);
 262
 263         par->powered_down  = 0;
 264         return 0;
 265 }
 266
 267 #endif