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