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 u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 148 {
 149         struct drm_psb_private *dev_priv = dev->dev_private;
 150         struct opregion_asle *asle = dev_priv->opregion.asle;
 151         struct backlight_device *bd = dev_priv->backlight_device;
 152
 153         DRM_DEBUG_DRIVER("asle set backlight %x\n", bclp);
 154
 155         if (!(bclp & ASLE_BCLP_VALID))
 156                 return ASLE_BACKLIGHT_FAILED;
 157
 158         if (bd == NULL)
 159                 return ASLE_BACKLIGHT_FAILED;
 160
 161         bclp &= ASLE_BCLP_MSK;
 162         if (bclp > 255)
 163                 return ASLE_BACKLIGHT_FAILED;
 164
 165         if (config_enabled(CONFIG_BACKLIGHT_CLASS_DEVICE)) {
 166                 int max = bd->props.max_brightness;
 167                 bd->props.brightness = bclp * max / 255;
 168                 backlight_update_status(bd);
 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) {
 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 static struct psb_intel_opregion *system_opregion;
 225
 226 static int psb_intel_opregion_video_event(struct notifier_block *nb,
 227                                           unsigned long val, void *data)
 228 {
 229         /* The only video events relevant to opregion are 0x80. These indicate
 230            either a docking event, lid switch or display switch request. In
 231            Linux, these are handled by the dock, button and video drivers.
 232            We might want to fix the video driver to be opregion-aware in
 233            future, but right now we just indicate to the firmware that the
 234            request has been handled */
 235
 236         struct opregion_acpi *acpi;
 237
 238         if (!system_opregion)
 239                 return NOTIFY_DONE;
 240
 241         acpi = system_opregion->acpi;
 242         acpi->csts = 0;
 243
 244         return NOTIFY_OK;
 245 }
 246
 247 static struct notifier_block psb_intel_opregion_notifier = {
 248         .notifier_call = psb_intel_opregion_video_event,
 249 };
 250
 251 void psb_intel_opregion_init(struct drm_device *dev)
 252 {
 253         struct drm_psb_private *dev_priv = dev->dev_private;
 254         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 255
 256         if (!opregion->header)
 257                 return;
 258
 259         if (opregion->acpi) {
 260                 /* Notify BIOS we are ready to handle ACPI video ext notifs.
 261                  * Right now, all the events are handled by the ACPI video
 262                  * module. We don't actually need to do anything with them. */
 263                 opregion->acpi->csts = 0;
 264                 opregion->acpi->drdy = 1;
 265
 266                 system_opregion = opregion;
 267                 register_acpi_notifier(&psb_intel_opregion_notifier);
 268         }
 269
 270         if (opregion->asle)
 271                 psb_intel_opregion_enable_asle(dev);
 272 }
 273
 274 void psb_intel_opregion_fini(struct drm_device *dev)
 275 {
 276         struct drm_psb_private *dev_priv = dev->dev_private;
 277         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 278
 279         if (!opregion->header)
 280                 return;
 281
 282         if (opregion->acpi) {
 283                 opregion->acpi->drdy = 0;
 284
 285                 system_opregion = NULL;
 286                 unregister_acpi_notifier(&psb_intel_opregion_notifier);
 287         }
 288
 289         /* just clear all opregion memory pointers now */
 290         iounmap(opregion->header);
 291         opregion->header = NULL;
 292         opregion->acpi = NULL;
 293         opregion->swsci = NULL;
 294         opregion->asle = NULL;
 295         opregion->vbt = NULL;
 296 }
 297
 298 int psb_intel_opregion_setup(struct drm_device *dev)
 299 {
 300         struct drm_psb_private *dev_priv = dev->dev_private;
 301         struct psb_intel_opregion *opregion = &dev_priv->opregion;
 302         u32 opregion_phy, mboxes;
 303         void __iomem *base;
 304         int err = 0;
 305
 306         pci_read_config_dword(dev->pdev, PCI_ASLS, &opregion_phy);
 307         if (opregion_phy == 0) {
 308                 DRM_DEBUG_DRIVER("ACPI Opregion not supported\n");
 309                 return -ENOTSUPP;
 310         }
 311         DRM_DEBUG("OpRegion detected at 0x%8x\n", opregion_phy);
 312         base = acpi_os_ioremap(opregion_phy, 8*1024);
 313         if (!base)
 314                 return -ENOMEM;
 315
 316         if (memcmp(base, OPREGION_SIGNATURE, 16)) {
 317                 DRM_DEBUG_DRIVER("opregion signature mismatch\n");
 318                 err = -EINVAL;
 319                 goto err_out;
 320         }
 321
 322         opregion->header = base;
 323         opregion->vbt = base + OPREGION_VBT_OFFSET;
 324
 325         opregion->lid_state = base + ACPI_CLID;
 326
 327         mboxes = opregion->header->mboxes;
 328         if (mboxes & MBOX_ACPI) {
 329                 DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
 330                 opregion->acpi = base + OPREGION_ACPI_OFFSET;
 331         }
 332
 333         if (mboxes & MBOX_ASLE) {
 334                 DRM_DEBUG_DRIVER("ASLE supported\n");
 335                 opregion->asle = base + OPREGION_ASLE_OFFSET;
 336         }
 337
 338         return 0;
 339
 340 err_out:
 341         iounmap(base);
 342         return err;
 343 }
 344