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 "psb_drv.h"
  26 #include "psb_intel_reg.h"
  27
  28 #define PCI_ASLE 0xe4
  29 #define PCI_ASLS 0xfc
  30
  31 #define OPREGION_HEADER_OFFSET 0
  32 #define OPREGION_ACPI_OFFSET   0x100
  33 #define   ACPI_CLID 0x01ac /* current lid state indicator */
  34 #define   ACPI_CDCK 0x01b0 /* current docking state indicator */
  35 #define OPREGION_SWSCI_OFFSET  0x200
  36 #define OPREGION_ASLE_OFFSET   0x300
  37 #define OPREGION_VBT_OFFSET    0x400
  38
  39 #define OPREGION_SIGNATURE "IntelGraphicsMem"
  40 #define MBOX_ACPI      (1<<0)
  41 #define MBOX_SWSCI     (1<<1)
  42 #define MBOX_ASLE      (1<<2)
  43
  44 struct opregion_header {
  45         u8 signature[16];
  46         u32 size;
  47         u32 opregion_ver;
  48         u8 bios_ver[32];
  49         u8 vbios_ver[16];
  50         u8 driver_ver[16];
  51         u32 mboxes;
  52         u8 reserved[164];
  53 } __packed;
  54
  55 /* OpRegion mailbox #1: public ACPI methods */
  56 struct opregion_acpi {
  57         u32 drdy;       /* driver readiness */
  58         u32 csts;       /* notification status */
  59         u32 cevt;       /* current event */
  60         u8 rsvd1[20];
  61         u32 didl[8];    /* supported display devices ID list */
  62         u32 cpdl[8];    /* currently presented display list */
  63         u32 cadl[8];    /* currently active display list */
  64         u32 nadl[8];    /* next active devices list */
  65         u32 aslp;       /* ASL sleep time-out */
  66         u32 tidx;       /* toggle table index */
  67         u32 chpd;       /* current hotplug enable indicator */
  68         u32 clid;       /* current lid state*/
  69         u32 cdck;       /* current docking state */
  70         u32 sxsw;       /* Sx state resume */
  71         u32 evts;       /* ASL supported events */
  72         u32 cnot;       /* current OS notification */
  73         u32 nrdy;       /* driver status */
  74         u8 rsvd2[60];
  75 } __packed;
  76
  77 /* OpRegion mailbox #2: SWSCI */
  78 struct opregion_swsci {
  79         /*FIXME: add it later*/
  80 } __packed;
  81
  82 /* OpRegion mailbox #3: ASLE */
  83 struct opregion_asle {
  84         u32 ardy;       /* driver readiness */
  85         u32 aslc;       /* ASLE interrupt command */
  86         u32 tche;       /* technology enabled indicator */
  87         u32 alsi;       /* current ALS illuminance reading */
  88         u32 bclp;       /* backlight brightness to set */
  89         u32 pfit;       /* panel fitting state */
  90         u32 cblv;       /* current brightness level */
  91         u16 bclm[20];   /* backlight level duty cycle mapping table */
  92         u32 cpfm;       /* current panel fitting mode */
  93         u32 epfm;       /* enabled panel fitting modes */
  94         u8 plut[74];    /* panel LUT and identifier */
  95         u32 pfmb;       /* PWM freq and min brightness */
  96         u8 rsvd[102];
  97 } __packed;
  98
  99 /* ASLE irq request bits */
 100 #define ASLE_SET_ALS_ILLUM     (1 << 0)
 101 #define ASLE_SET_BACKLIGHT     (1 << 1)
 102 #define ASLE_SET_PFIT          (1 << 2)
 103 #define ASLE_SET_PWM_FREQ      (1 << 3)
 104 #define ASLE_REQ_MSK           0xf
 105
 106 /* response bits of ASLE irq request */
 107 #define ASLE_ALS_ILLUM_FAILED   (1<<10)
 108 #define ASLE_BACKLIGHT_FAILED   (1<<12)
 109 #define ASLE_PFIT_FAILED        (1<<14)
 110 #define ASLE_PWM_FREQ_FAILED    (1<<16)
 111
 112 /* ASLE backlight brightness to set */
 113 #define ASLE_BCLP_VALID                (1<<31)
 114 #define ASLE_BCLP_MSK          (~(1<<31))
 115
 116 /* ASLE panel fitting request */
 117 #define ASLE_PFIT_VALID         (1<<31)
 118 #define ASLE_PFIT_CENTER (1<<0)
 119 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
 120 #define ASLE_PFIT_STRETCH_GFX (1<<2)
 121
 122 /* response bits of ASLE irq request */
 123 #define ASLE_ALS_ILLUM_FAILED   (1<<10)
 124 #define ASLE_BACKLIGHT_FAILED   (1<<12)
 125 #define ASLE_PFIT_FAILED        (1<<14)
 126 #define ASLE_PWM_FREQ_FAILED    (1<<16)
 127
 128 /* ASLE backlight brightness to set */
 129 #define ASLE_BCLP_VALID                (1<<31)
 130 #define ASLE_BCLP_MSK          (~(1<<31))
 131
 132 /* ASLE panel fitting request */
 133 #define ASLE_PFIT_VALID         (1<<31)
 134 #define ASLE_PFIT_CENTER (1<<0)
 135 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
 136 #define ASLE_PFIT_STRETCH_GFX (1<<2)
 137
 138 /* PWM frequency and minimum brightness */
 139 #define ASLE_PFMB_BRIGHTNESS_MASK (0xff)
 140 #define ASLE_PFMB_BRIGHTNESS_VALID (1<<8)
 141 #define ASLE_PFMB_PWM_MASK (0x7ffffe00)
 142 #define ASLE_PFMB_PWM_VALID (1<<31)
 143
 144 #define ASLE_CBLV_VALID         (1<<31)
 145
 146 static struct psb_intel_opregion *system_opregion;
 147
 148 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 149 {
 150         struct drm_psb_private *dev_priv = dev->dev_private;
 151         struct opregion_asle *asle = dev_priv->opregion.asle;
 152         struct backlight_device *bd = dev_priv->backlight_device;
 153
 154         DRM_DEBUG_DRIVER("asle set backlight %x\n", bclp);
 155
 156         if (!(bclp & ASLE_BCLP_VALID))
 157                 return ASLE_BACKLIGHT_FAILED;
 158
 159         if (bd == NULL)
 160                 return ASLE_BACKLIGHT_FAILED;
 161
 162         bclp &= ASLE_BCLP_MSK;
 163         if (bclp > 255)
 164                 return ASLE_BACKLIGHT_FAILED;
 165
 166         gma_backlight_set(dev, bclp * bd->props.max_brightness / 255);
 167
 168         asle->cblv = (bclp * 0x64) / 0xff | ASLE_CBLV_VALID;
 169
 170         return 0;
 171 }
 172
 173 static void psb_intel_opregion_asle_work(struct work_struct *work)
 174 {
 175         struct psb_intel_opregion *opregion =
 176                 container_of(work, struct psb_intel_opregion, asle_work);
 177         struct drm_psb_private *dev_priv =
 178                 container_of(opregion, struct drm_psb_private, opregion);
 179         struct opregion_asle *asle = opregion->asle;
 180         u32 asle_stat = 0;
 181         u32 asle_req;
 182
 183         if (!asle)
 184                 return;
 185
 186         asle_req = asle->aslc & ASLE_REQ_MSK;
 187         if (!asle_req) {
 188                 DRM_DEBUG_DRIVER("non asle set request??\n");
 189                 return;
 190         }
 191
 192         if (asle_req & ASLE_SET_BACKLIGHT)
 193                 asle_stat |= asle_set_backlight(dev_priv->dev, asle->bclp);
 194
 195         asle->aslc = asle_stat;
 196
 197 }
 198
 199 void psb_intel_opregion_asle_intr(struct drm_device *dev)
 200 {
 201         struct drm_psb_private *dev_priv = dev->dev_private;
 202
 203         if (dev_priv->opregion.asle)
 204                 schedule_work(&dev_priv->opregion.asle_work);
 205 }
 206
 207 #define ASLE_ALS_EN    (1<<0)
 208 #define ASLE_BLC_EN    (1<<1)
 209 #define ASLE_PFIT_EN   (1<<2)
 210 #define ASLE_PFMB_EN   (1<<3)
 211
 212 void psb_intel_opregion_enable_asle(struct drm_device *dev)
 213 {
 214         struct drm_psb_private *dev_priv = dev->dev_private;
 215         struct opregion_asle *asle = dev_priv->opregion.asle;
 216
 217         if (asle && system_opregion ) {
 218                 /* Don't do this on Medfield or other non PC like devices, they
 219                    use the bit for something different altogether */
 220                 psb_enable_pipestat(dev_priv, 0, PIPE_LEGACY_BLC_EVENT_ENABLE);
 221                 psb_enable_pipestat(dev_priv, 1, PIPE_LEGACY_BLC_EVENT_ENABLE);
 222
 223                 asle->tche = ASLE_ALS_EN | ASLE_BLC_EN | ASLE_PFIT_EN
 224                                                                 | ASLE_PFMB_EN;
 225                 asle->ardy = 1;
 226         }
 227 }
 228
 229 #define ACPI_EV_DISPLAY_SWITCH (1<<0)
 230 #define ACPI_EV_LID            (1<<1)
 231 #define ACPI_EV_DOCK           (1<<2)
 232
 233
 234 static int psb_intel_opregion_video_event(struct notifier_block *nb,
 235                                           unsigned long val, void *data)
 236 {
 237         /* The only video events relevant to opregion are 0x80. These indicate
 238            either a docking event, lid switch or display switch request. In
 239            Linux, these are handled by the dock, button and video drivers.
 240            We might want to fix the video driver to be opregion-aware in
 241            future, but right now we just indicate to the firmware that the
 242            request has been handled */
 243
 244         struct opregion_acpi *acpi;
 245
 246         if (!system_opregion)
 247                 return NOTIFY_DONE;
 248
 249         acpi = system_opregion->acpi;
 250         acpi->csts = 0;
 251
 252         return NOTIFY_OK;
 253 }
 254
 255 static struct notifier_block psb_intel_opregion_notifier = {
 256         .notifier_call = psb_intel_opregion_video_event,
 257 };
 258
 259 void psb_intel_opregion_init(struct drm_device *dev)
 260 {
 261         struct drm_psb_private *dev_priv = dev->dev_private;
 262         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 263
 264         if (!opregion->header)
 265                 return;
 266
 267         if (opregion->acpi) {
 268                 /* Notify BIOS we are ready to handle ACPI video ext notifs.
 269                  * Right now, all the events are handled by the ACPI video
 270                  * module. We don't actually need to do anything with them. */
 271                 opregion->acpi->csts = 0;
 272                 opregion->acpi->drdy = 1;
 273
 274                 system_opregion = opregion;
 275                 register_acpi_notifier(&psb_intel_opregion_notifier);
 276         }
 277 }
 278
 279 void psb_intel_opregion_fini(struct drm_device *dev)
 280 {
 281         struct drm_psb_private *dev_priv = dev->dev_private;
 282         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 283
 284         if (!opregion->header)
 285                 return;
 286
 287         if (opregion->acpi) {
 288                 opregion->acpi->drdy = 0;
 289
 290                 system_opregion = NULL;
 291                 unregister_acpi_notifier(&psb_intel_opregion_notifier);
 292         }
 293
 294         cancel_work_sync(&opregion->asle_work);
 295
 296         /* just clear all opregion memory pointers now */
 297         iounmap(opregion->header);
 298         opregion->header = NULL;
 299         opregion->acpi = NULL;
 300         opregion->swsci = NULL;
 301         opregion->asle = NULL;
 302         opregion->vbt = NULL;
 303 }
 304
 305 int psb_intel_opregion_setup(struct drm_device *dev)
 306 {
 307         struct drm_psb_private *dev_priv = dev->dev_private;
 308         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 309         u32 opregion_phy, mboxes;
 310         void __iomem *base;
 311         int err = 0;
 312
 313         pci_read_config_dword(dev->pdev, PCI_ASLS, &opregion_phy);
 314         if (opregion_phy == 0) {
 315                 DRM_DEBUG_DRIVER("ACPI Opregion not supported\n");
 316                 return -ENOTSUPP;
 317         }
 318
 319         INIT_WORK(&opregion->asle_work, psb_intel_opregion_asle_work);
 320
 321         DRM_DEBUG("OpRegion detected at 0x%8x\n", opregion_phy);
 322         base = acpi_os_ioremap(opregion_phy, 8*1024);
 323         if (!base)
 324                 return -ENOMEM;
 325
 326         if (memcmp(base, OPREGION_SIGNATURE, 16)) {
 327                 DRM_DEBUG_DRIVER("opregion signature mismatch\n");
 328                 err = -EINVAL;
 329                 goto err_out;
 330         }
 331
 332         opregion->header = base;
 333         opregion->vbt = base + OPREGION_VBT_OFFSET;
 334
 335         opregion->lid_state = base + ACPI_CLID;
 336
 337         mboxes = opregion->header->mboxes;
 338         if (mboxes & MBOX_ACPI) {
 339                 DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
 340                 opregion->acpi = base + OPREGION_ACPI_OFFSET;
 341         }
 342
 343         if (mboxes & MBOX_ASLE) {
 344                 DRM_DEBUG_DRIVER("ASLE supported\n");
 345                 opregion->asle = base + OPREGION_ASLE_OFFSET;
 346         }
 347
 348         return 0;
 349
 350 err_out:
 351         iounmap(base);
 352         return err;
 353 }
 354