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