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         if (config_enabled(CONFIG_BACKLIGHT_CLASS_DEVICE)) {
 167                 int max = bd->props.max_brightness;
 168                 gma_backlight_set(dev, bclp * max / 255);
 169         }
 170
 171         asle->cblv = (bclp * 0x64) / 0xff | ASLE_CBLV_VALID;
 172
 173         return 0;
 174 }
 175
 176 static void psb_intel_opregion_asle_work(struct work_struct *work)
 177 {
 178         struct psb_intel_opregion *opregion =
 179                 container_of(work, struct psb_intel_opregion, asle_work);
 180         struct drm_psb_private *dev_priv =
 181                 container_of(opregion, struct drm_psb_private, opregion);
 182         struct opregion_asle *asle = opregion->asle;
 183         u32 asle_stat = 0;
 184         u32 asle_req;
 185
 186         if (!asle)
 187                 return;
 188
 189         asle_req = asle->aslc & ASLE_REQ_MSK;
 190         if (!asle_req) {
 191                 DRM_DEBUG_DRIVER("non asle set request??\n");
 192                 return;
 193         }
 194
 195         if (asle_req & ASLE_SET_BACKLIGHT)
 196                 asle_stat |= asle_set_backlight(dev_priv->dev, asle->bclp);
 197
 198         asle->aslc = asle_stat;
 199
 200 }
 201
 202 void psb_intel_opregion_asle_intr(struct drm_device *dev)
 203 {
 204         struct drm_psb_private *dev_priv = dev->dev_private;
 205
 206         if (dev_priv->opregion.asle)
 207                 schedule_work(&dev_priv->opregion.asle_work);
 208 }
 209
 210 #define ASLE_ALS_EN    (1<<0)
 211 #define ASLE_BLC_EN    (1<<1)
 212 #define ASLE_PFIT_EN   (1<<2)
 213 #define ASLE_PFMB_EN   (1<<3)
 214
 215 void psb_intel_opregion_enable_asle(struct drm_device *dev)
 216 {
 217         struct drm_psb_private *dev_priv = dev->dev_private;
 218         struct opregion_asle *asle = dev_priv->opregion.asle;
 219
 220         if (asle && system_opregion ) {
 221                 /* Don't do this on Medfield or other non PC like devices, they
 222                    use the bit for something different altogether */
 223                 psb_enable_pipestat(dev_priv, 0, PIPE_LEGACY_BLC_EVENT_ENABLE);
 224                 psb_enable_pipestat(dev_priv, 1, PIPE_LEGACY_BLC_EVENT_ENABLE);
 225
 226                 asle->tche = ASLE_ALS_EN | ASLE_BLC_EN | ASLE_PFIT_EN
 227                                                                 | ASLE_PFMB_EN;
 228                 asle->ardy = 1;
 229         }
 230 }
 231
 232 #define ACPI_EV_DISPLAY_SWITCH (1<<0)
 233 #define ACPI_EV_LID            (1<<1)
 234 #define ACPI_EV_DOCK           (1<<2)
 235
 236
 237 static int psb_intel_opregion_video_event(struct notifier_block *nb,
 238                                           unsigned long val, void *data)
 239 {
 240         /* The only video events relevant to opregion are 0x80. These indicate
 241            either a docking event, lid switch or display switch request. In
 242            Linux, these are handled by the dock, button and video drivers.
 243            We might want to fix the video driver to be opregion-aware in
 244            future, but right now we just indicate to the firmware that the
 245            request has been handled */
 246
 247         struct opregion_acpi *acpi;
 248
 249         if (!system_opregion)
 250                 return NOTIFY_DONE;
 251
 252         acpi = system_opregion->acpi;
 253         acpi->csts = 0;
 254
 255         return NOTIFY_OK;
 256 }
 257
 258 static struct notifier_block psb_intel_opregion_notifier = {
 259         .notifier_call = psb_intel_opregion_video_event,
 260 };
 261
 262 void psb_intel_opregion_init(struct drm_device *dev)
 263 {
 264         struct drm_psb_private *dev_priv = dev->dev_private;
 265         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 266
 267         if (!opregion->header)
 268                 return;
 269
 270         if (opregion->acpi) {
 271                 /* Notify BIOS we are ready to handle ACPI video ext notifs.
 272                  * Right now, all the events are handled by the ACPI video
 273                  * module. We don't actually need to do anything with them. */
 274                 opregion->acpi->csts = 0;
 275                 opregion->acpi->drdy = 1;
 276
 277                 system_opregion = opregion;
 278                 register_acpi_notifier(&psb_intel_opregion_notifier);
 279         }
 280 }
 281
 282 void psb_intel_opregion_fini(struct drm_device *dev)
 283 {
 284         struct drm_psb_private *dev_priv = dev->dev_private;
 285         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 286
 287         if (!opregion->header)
 288                 return;
 289
 290         if (opregion->acpi) {
 291                 opregion->acpi->drdy = 0;
 292
 293                 system_opregion = NULL;
 294                 unregister_acpi_notifier(&psb_intel_opregion_notifier);
 295         }
 296
 297         cancel_work_sync(&opregion->asle_work);
 298
 299         /* just clear all opregion memory pointers now */
 300         iounmap(opregion->header);
 301         opregion->header = NULL;
 302         opregion->acpi = NULL;
 303         opregion->swsci = NULL;
 304         opregion->asle = NULL;
 305         opregion->vbt = NULL;
 306 }
 307
 308 int psb_intel_opregion_setup(struct drm_device *dev)
 309 {
 310         struct drm_psb_private *dev_priv = dev->dev_private;
 311         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 312         u32 opregion_phy, mboxes;
 313         void __iomem *base;
 314         int err = 0;
 315
 316         pci_read_config_dword(dev->pdev, PCI_ASLS, &opregion_phy);
 317         if (opregion_phy == 0) {
 318                 DRM_DEBUG_DRIVER("ACPI Opregion not supported\n");
 319                 return -ENOTSUPP;
 320         }
 321
 322         INIT_WORK(&opregion->asle_work, psb_intel_opregion_asle_work);
 323
 324         DRM_DEBUG("OpRegion detected at 0x%8x\n", opregion_phy);
 325         base = acpi_os_ioremap(opregion_phy, 8*1024);
 326         if (!base)
 327                 return -ENOMEM;
 328
 329         if (memcmp(base, OPREGION_SIGNATURE, 16)) {
 330                 DRM_DEBUG_DRIVER("opregion signature mismatch\n");
 331                 err = -EINVAL;
 332                 goto err_out;
 333         }
 334
 335         opregion->header = base;
 336         opregion->vbt = base + OPREGION_VBT_OFFSET;
 337
 338         opregion->lid_state = base + ACPI_CLID;
 339
 340         mboxes = opregion->header->mboxes;
 341         if (mboxes & MBOX_ACPI) {
 342                 DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
 343                 opregion->acpi = base + OPREGION_ACPI_OFFSET;
 344         }
 345
 346         if (mboxes & MBOX_ASLE) {
 347                 DRM_DEBUG_DRIVER("ASLE supported\n");
 348                 opregion->asle = base + OPREGION_ASLE_OFFSET;
 349         }
 350
 351         return 0;
 352
 353 err_out:
 354         iounmap(base);
 355         return err;
 356 }
 357