drivers/gpu/drm/gma500/opregion.c

   1 /*
   2  * Copyright 2011 Intel Corporation
   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 (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  */
  24 #include <linux/acpi.h>
  25 #include <linux/acpi_io.h>
  26 #include "psb_drv.h"
  27 #include "psb_intel_reg.h"
  28
  29 #define PCI_ASLE 0xe4
  30 #define PCI_ASLS 0xfc
  31
  32 #define OPREGION_HEADER_OFFSET 0
  33 #define OPREGION_ACPI_OFFSET   0x100
  34 #define   ACPI_CLID 0x01ac /* current lid state indicator */
  35 #define   ACPI_CDCK 0x01b0 /* current docking state indicator */
  36 #define OPREGION_SWSCI_OFFSET  0x200
  37 #define OPREGION_ASLE_OFFSET   0x300
  38 #define OPREGION_VBT_OFFSET    0x400
  39
  40 #define OPREGION_SIGNATURE "IntelGraphicsMem"
  41 #define MBOX_ACPI      (1<<0)
  42 #define MBOX_SWSCI     (1<<1)
  43 #define MBOX_ASLE      (1<<2)
  44
  45 struct opregion_header {
  46         u8 signature[16];
  47         u32 size;
  48         u32 opregion_ver;
  49         u8 bios_ver[32];
  50         u8 vbios_ver[16];
  51         u8 driver_ver[16];
  52         u32 mboxes;
  53         u8 reserved[164];
  54 } __packed;
  55
  56 /* OpRegion mailbox #1: public ACPI methods */
  57 struct opregion_acpi {
  58         u32 drdy;       /* driver readiness */
  59         u32 csts;       /* notification status */
  60         u32 cevt;       /* current event */
  61         u8 rsvd1[20];
  62         u32 didl[8];    /* supported display devices ID list */
  63         u32 cpdl[8];    /* currently presented display list */
  64         u32 cadl[8];    /* currently active display list */
  65         u32 nadl[8];    /* next active devices list */
  66         u32 aslp;       /* ASL sleep time-out */
  67         u32 tidx;       /* toggle table index */
  68         u32 chpd;       /* current hotplug enable indicator */
  69         u32 clid;       /* current lid state*/
  70         u32 cdck;       /* current docking state */
  71         u32 sxsw;       /* Sx state resume */
  72         u32 evts;       /* ASL supported events */
  73         u32 cnot;       /* current OS notification */
  74         u32 nrdy;       /* driver status */
  75         u8 rsvd2[60];
  76 } __packed;
  77
  78 /* OpRegion mailbox #2: SWSCI */
  79 struct opregion_swsci {
  80         /*FIXME: add it later*/
  81 } __packed;
  82
  83 /* OpRegion mailbox #3: ASLE */
  84 struct opregion_asle {
  85         u32 ardy;       /* driver readiness */
  86         u32 aslc;       /* ASLE interrupt command */
  87         u32 tche;       /* technology enabled indicator */
  88         u32 alsi;       /* current ALS illuminance reading */
  89         u32 bclp;       /* backlight brightness to set */
  90         u32 pfit;       /* panel fitting state */
  91         u32 cblv;       /* current brightness level */
  92         u16 bclm[20];   /* backlight level duty cycle mapping table */
  93         u32 cpfm;       /* current panel fitting mode */
  94         u32 epfm;       /* enabled panel fitting modes */
  95         u8 plut[74];    /* panel LUT and identifier */
  96         u32 pfmb;       /* PWM freq and min brightness */
  97         u8 rsvd[102];
  98 } __packed;
  99
 100 /* ASLE irq request bits */
 101 #define ASLE_SET_ALS_ILLUM     (1 << 0)
 102 #define ASLE_SET_BACKLIGHT     (1 << 1)
 103 #define ASLE_SET_PFIT          (1 << 2)
 104 #define ASLE_SET_PWM_FREQ      (1 << 3)
 105 #define ASLE_REQ_MSK           0xf
 106
 107 /* response bits of ASLE irq request */
 108 #define ASLE_ALS_ILLUM_FAILED   (1<<10)
 109 #define ASLE_BACKLIGHT_FAILED   (1<<12)
 110 #define ASLE_PFIT_FAILED        (1<<14)
 111 #define ASLE_PWM_FREQ_FAILED    (1<<16)
 112
 113 /* ASLE backlight brightness to set */
 114 #define ASLE_BCLP_VALID                (1<<31)
 115 #define ASLE_BCLP_MSK          (~(1<<31))
 116
 117 /* ASLE panel fitting request */
 118 #define ASLE_PFIT_VALID         (1<<31)
 119 #define ASLE_PFIT_CENTER (1<<0)
 120 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
 121 #define ASLE_PFIT_STRETCH_GFX (1<<2)
 122
 123 /* response bits of ASLE irq request */
 124 #define ASLE_ALS_ILLUM_FAILED   (1<<10)
 125 #define ASLE_BACKLIGHT_FAILED   (1<<12)
 126 #define ASLE_PFIT_FAILED        (1<<14)
 127 #define ASLE_PWM_FREQ_FAILED    (1<<16)
 128
 129 /* ASLE backlight brightness to set */
 130 #define ASLE_BCLP_VALID                (1<<31)
 131 #define ASLE_BCLP_MSK          (~(1<<31))
 132
 133 /* ASLE panel fitting request */
 134 #define ASLE_PFIT_VALID         (1<<31)
 135 #define ASLE_PFIT_CENTER (1<<0)
 136 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
 137 #define ASLE_PFIT_STRETCH_GFX (1<<2)
 138
 139 /* PWM frequency and minimum brightness */
 140 #define ASLE_PFMB_BRIGHTNESS_MASK (0xff)
 141 #define ASLE_PFMB_BRIGHTNESS_VALID (1<<8)
 142 #define ASLE_PFMB_PWM_MASK (0x7ffffe00)
 143 #define ASLE_PFMB_PWM_VALID (1<<31)
 144
 145 #define ASLE_CBLV_VALID         (1<<31)
 146
 147 static struct psb_intel_opregion *system_opregion;
 148
 149 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 150 {
 151         struct drm_psb_private *dev_priv = dev->dev_private;
 152         struct opregion_asle *asle = dev_priv->opregion.asle;
 153         struct backlight_device *bd = dev_priv->backlight_device;
 154
 155         DRM_DEBUG_DRIVER("asle set backlight %x\n", bclp);
 156
 157         if (!(bclp & ASLE_BCLP_VALID))
 158                 return ASLE_BACKLIGHT_FAILED;
 159
 160         if (bd == NULL)
 161                 return ASLE_BACKLIGHT_FAILED;
 162
 163         bclp &= ASLE_BCLP_MSK;
 164         if (bclp > 255)
 165                 return ASLE_BACKLIGHT_FAILED;
 166
 167         if (config_enabled(CONFIG_BACKLIGHT_CLASS_DEVICE)) {
 168                 int max = bd->props.max_brightness;
 169                 bd->props.brightness = bclp * max / 255;
 170                 backlight_update_status(bd);
 171         }
 172
 173         asle->cblv = (bclp * 0x64) / 0xff | ASLE_CBLV_VALID;
 174
 175         return 0;
 176 }
 177
 178 void psb_intel_opregion_asle_intr(struct drm_device *dev)
 179 {
 180         struct drm_psb_private *dev_priv = dev->dev_private;
 181         struct opregion_asle *asle = dev_priv->opregion.asle;
 182         u32 asle_stat = 0;
 183         u32 asle_req;
 184
 185         if (!asle)
 186                 return;
 187
 188         asle_req = asle->aslc & ASLE_REQ_MSK;
 189         if (!asle_req) {
 190                 DRM_DEBUG_DRIVER("non asle set request??\n");
 191                 return;
 192         }
 193
 194         if (asle_req & ASLE_SET_BACKLIGHT)
 195                 asle_stat |= asle_set_backlight(dev, asle->bclp);
 196
 197         asle->aslc = asle_stat;
 198 }
 199
 200 #define ASLE_ALS_EN    (1<<0)
 201 #define ASLE_BLC_EN    (1<<1)
 202 #define ASLE_PFIT_EN   (1<<2)
 203 #define ASLE_PFMB_EN   (1<<3)
 204
 205 void psb_intel_opregion_enable_asle(struct drm_device *dev)
 206 {
 207         struct drm_psb_private *dev_priv = dev->dev_private;
 208         struct opregion_asle *asle = dev_priv->opregion.asle;
 209
 210         if (asle && system_opregion ) {
 211                 /* Don't do this on Medfield or other non PC like devices, they
 212                    use the bit for something different altogether */
 213                 psb_enable_pipestat(dev_priv, 0, PIPE_LEGACY_BLC_EVENT_ENABLE);
 214                 psb_enable_pipestat(dev_priv, 1, PIPE_LEGACY_BLC_EVENT_ENABLE);
 215
 216                 asle->tche = ASLE_ALS_EN | ASLE_BLC_EN | ASLE_PFIT_EN
 217                                                                 | ASLE_PFMB_EN;
 218                 asle->ardy = 1;
 219         }
 220 }
 221
 222 #define ACPI_EV_DISPLAY_SWITCH (1<<0)
 223 #define ACPI_EV_LID            (1<<1)
 224 #define ACPI_EV_DOCK           (1<<2)
 225
 226
 227 static int psb_intel_opregion_video_event(struct notifier_block *nb,
 228                                           unsigned long val, void *data)
 229 {
 230         /* The only video events relevant to opregion are 0x80. These indicate
 231            either a docking event, lid switch or display switch request. In
 232            Linux, these are handled by the dock, button and video drivers.
 233            We might want to fix the video driver to be opregion-aware in
 234            future, but right now we just indicate to the firmware that the
 235            request has been handled */
 236
 237         struct opregion_acpi *acpi;
 238
 239         if (!system_opregion)
 240                 return NOTIFY_DONE;
 241
 242         acpi = system_opregion->acpi;
 243         acpi->csts = 0;
 244
 245         return NOTIFY_OK;
 246 }
 247
 248 static struct notifier_block psb_intel_opregion_notifier = {
 249         .notifier_call = psb_intel_opregion_video_event,
 250 };
 251
 252 void psb_intel_opregion_init(struct drm_device *dev)
 253 {
 254         struct drm_psb_private *dev_priv = dev->dev_private;
 255         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 256
 257         if (!opregion->header)
 258                 return;
 259
 260         if (opregion->acpi) {
 261                 /* Notify BIOS we are ready to handle ACPI video ext notifs.
 262                  * Right now, all the events are handled by the ACPI video
 263                  * module. We don't actually need to do anything with them. */
 264                 opregion->acpi->csts = 0;
 265                 opregion->acpi->drdy = 1;
 266
 267                 system_opregion = opregion;
 268                 register_acpi_notifier(&psb_intel_opregion_notifier);
 269         }
 270 }
 271
 272 void psb_intel_opregion_fini(struct drm_device *dev)
 273 {
 274         struct drm_psb_private *dev_priv = dev->dev_private;
 275         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 276
 277         if (!opregion->header)
 278                 return;
 279
 280         if (opregion->acpi) {
 281                 opregion->acpi->drdy = 0;
 282
 283                 system_opregion = NULL;
 284                 unregister_acpi_notifier(&psb_intel_opregion_notifier);
 285         }
 286
 287         /* just clear all opregion memory pointers now */
 288         iounmap(opregion->header);
 289         opregion->header = NULL;
 290         opregion->acpi = NULL;
 291         opregion->swsci = NULL;
 292         opregion->asle = NULL;
 293         opregion->vbt = NULL;
 294 }
 295
 296 int psb_intel_opregion_setup(struct drm_device *dev)
 297 {
 298         struct drm_psb_private *dev_priv = dev->dev_private;
 299         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 300         u32 opregion_phy, mboxes;
 301         void __iomem *base;
 302         int err = 0;
 303
 304         pci_read_config_dword(dev->pdev, PCI_ASLS, &opregion_phy);
 305         if (opregion_phy == 0) {
 306                 DRM_DEBUG_DRIVER("ACPI Opregion not supported\n");
 307                 return -ENOTSUPP;
 308         }
 309         DRM_DEBUG("OpRegion detected at 0x%8x\n", opregion_phy);
 310         base = acpi_os_ioremap(opregion_phy, 8*1024);
 311         if (!base)
 312                 return -ENOMEM;
 313
 314         if (memcmp(base, OPREGION_SIGNATURE, 16)) {
 315                 DRM_DEBUG_DRIVER("opregion signature mismatch\n");
 316                 err = -EINVAL;
 317                 goto err_out;
 318         }
 319
 320         opregion->header = base;
 321         opregion->vbt = base + OPREGION_VBT_OFFSET;
 322
 323         opregion->lid_state = base + ACPI_CLID;
 324
 325         mboxes = opregion->header->mboxes;
 326         if (mboxes & MBOX_ACPI) {
 327                 DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
 328                 opregion->acpi = base + OPREGION_ACPI_OFFSET;
 329         }
 330
 331         if (mboxes & MBOX_ASLE) {
 332                 DRM_DEBUG_DRIVER("ASLE supported\n");
 333                 opregion->asle = base + OPREGION_ASLE_OFFSET;
 334         }
 335
 336         return 0;
 337
 338 err_out:
 339         iounmap(base);
 340         return err;
 341 }
 342