LXR linux/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
  44struct 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 */
  56struct 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 */
  78struct opregion_swsci {
  79        /*FIXME: add it later*/
  80} __packed;
  81
  82/* OpRegion mailbox #3: ASLE */
  83struct 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
 146static struct psb_intel_opregion *system_opregion;
 147
 148static 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
 173static 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
 199void 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
 212void 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
 234static 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
 255static struct notifier_block psb_intel_opregion_notifier = {
 256        .notifier_call = psb_intel_opregion_video_event,
 257};
 258
 259void 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
 279void 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
 305int 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
 350err_out:
 351        iounmap(base);
 352        return err;
 353}
 354
 355