drivers/staging/gma500/psb_device.c

   1 /**************************************************************************
   2  * Copyright (c) 2011, Intel Corporation.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  **************************************************************************/
  19
  20 #include <linux/backlight.h>
  21 #include <drm/drmP.h>
  22 #include <drm/drm.h>
  23 #include "psb_drm.h"
  24 #include "psb_drv.h"
  25 #include "psb_reg.h"
  26 #include "psb_intel_reg.h"
  27 #include "intel_bios.h"
  28
  29
  30 static int psb_output_init(struct drm_device *dev)
  31 {
  32         struct drm_psb_private *dev_priv = dev->dev_private;
  33         psb_intel_lvds_init(dev, &dev_priv->mode_dev);
  34         psb_intel_sdvo_init(dev, SDVOB);
  35         return 0;
  36 }
  37
  38 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
  39
  40 /*
  41  *      Poulsbo Backlight Interfaces
  42  */
  43
  44 #define BLC_PWM_PRECISION_FACTOR 100    /* 10000000 */
  45 #define BLC_PWM_FREQ_CALC_CONSTANT 32
  46 #define MHz 1000000
  47
  48 #define PSB_BLC_PWM_PRECISION_FACTOR    10
  49 #define PSB_BLC_MAX_PWM_REG_FREQ        0xFFFE
  50 #define PSB_BLC_MIN_PWM_REG_FREQ        0x2
  51
  52 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
  53 #define PSB_BACKLIGHT_PWM_CTL_SHIFT     (16)
  54
  55 static int psb_brightness;
  56 static struct backlight_device *psb_backlight_device;
  57
  58 static int psb_get_brightness(struct backlight_device *bd)
  59 {
  60         /* return locally cached var instead of HW read (due to DPST etc.) */
  61         /* FIXME: ideally return actual value in case firmware fiddled with
  62            it */
  63         return psb_brightness;
  64 }
  65
  66
  67 static int psb_backlight_setup(struct drm_device *dev)
  68 {
  69         struct drm_psb_private *dev_priv = dev->dev_private;
  70         unsigned long core_clock;
  71         /* u32 bl_max_freq; */
  72         /* unsigned long value; */
  73         u16 bl_max_freq;
  74         uint32_t value;
  75         uint32_t blc_pwm_precision_factor;
  76
  77         /* get bl_max_freq and pol from dev_priv*/
  78         if (!dev_priv->lvds_bl) {
  79                 dev_err(dev->dev, "Has no valid LVDS backlight info\n");
  80                 return -ENOENT;
  81         }
  82         bl_max_freq = dev_priv->lvds_bl->freq;
  83         blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR;
  84
  85         core_clock = dev_priv->core_freq;
  86
  87         value = (core_clock * MHz) / BLC_PWM_FREQ_CALC_CONSTANT;
  88         value *= blc_pwm_precision_factor;
  89         value /= bl_max_freq;
  90         value /= blc_pwm_precision_factor;
  91
  92         if (value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ ||
  93                  value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ)
  94                                 return -ERANGE;
  95         else {
  96                 value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
  97                 REG_WRITE(BLC_PWM_CTL,
  98                         (value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | (value));
  99         }
 100         return 0;
 101 }
 102
 103 static int psb_set_brightness(struct backlight_device *bd)
 104 {
 105         struct drm_device *dev = bl_get_data(psb_backlight_device);
 106         int level = bd->props.brightness;
 107
 108         /* Percentage 1-100% being valid */
 109         if (level < 1)
 110                 level = 1;
 111
 112         psb_intel_lvds_set_brightness(dev, level);
 113         psb_brightness = level;
 114         return 0;
 115 }
 116
 117 static const struct backlight_ops psb_ops = {
 118         .get_brightness = psb_get_brightness,
 119         .update_status  = psb_set_brightness,
 120 };
 121
 122 static int psb_backlight_init(struct drm_device *dev)
 123 {
 124         struct drm_psb_private *dev_priv = dev->dev_private;
 125         int ret;
 126         struct backlight_properties props;
 127
 128         memset(&props, 0, sizeof(struct backlight_properties));
 129         props.max_brightness = 100;
 130         props.type = BACKLIGHT_PLATFORM;
 131
 132         psb_backlight_device = backlight_device_register("psb-bl",
 133                                         NULL, (void *)dev, &psb_ops, &props);
 134         if (IS_ERR(psb_backlight_device))
 135                 return PTR_ERR(psb_backlight_device);
 136
 137         ret = psb_backlight_setup(dev);
 138         if (ret < 0) {
 139                 backlight_device_unregister(psb_backlight_device);
 140                 psb_backlight_device = NULL;
 141                 return ret;
 142         }
 143         psb_backlight_device->props.brightness = 100;
 144         psb_backlight_device->props.max_brightness = 100;
 145         backlight_update_status(psb_backlight_device);
 146         dev_priv->backlight_device = psb_backlight_device;
 147         return 0;
 148 }
 149
 150 #endif
 151
 152 /*
 153  *      Provide the Poulsbo specific chip logic and low level methods
 154  *      for power management
 155  */
 156
 157 static void psb_init_pm(struct drm_device *dev)
 158 {
 159         struct drm_psb_private *dev_priv = dev->dev_private;
 160
 161         u32 gating = PSB_RSGX32(PSB_CR_CLKGATECTL);
 162         gating &= ~3;   /* Disable 2D clock gating */
 163         gating |= 1;
 164         PSB_WSGX32(gating, PSB_CR_CLKGATECTL);
 165         PSB_RSGX32(PSB_CR_CLKGATECTL);
 166 }
 167
 168 /**
 169  *      psb_save_display_registers      -       save registers lost on suspend
 170  *      @dev: our DRM device
 171  *
 172  *      Save the state we need in order to be able to restore the interface
 173  *      upon resume from suspend
 174  */
 175 static int psb_save_display_registers(struct drm_device *dev)
 176 {
 177         struct drm_psb_private *dev_priv = dev->dev_private;
 178         struct drm_crtc *crtc;
 179         struct drm_connector *connector;
 180
 181         /* Display arbitration control + watermarks */
 182         dev_priv->saveDSPARB = PSB_RVDC32(DSPARB);
 183         dev_priv->saveDSPFW1 = PSB_RVDC32(DSPFW1);
 184         dev_priv->saveDSPFW2 = PSB_RVDC32(DSPFW2);
 185         dev_priv->saveDSPFW3 = PSB_RVDC32(DSPFW3);
 186         dev_priv->saveDSPFW4 = PSB_RVDC32(DSPFW4);
 187         dev_priv->saveDSPFW5 = PSB_RVDC32(DSPFW5);
 188         dev_priv->saveDSPFW6 = PSB_RVDC32(DSPFW6);
 189         dev_priv->saveCHICKENBIT = PSB_RVDC32(DSPCHICKENBIT);
 190
 191         /* Save crtc and output state */
 192         mutex_lock(&dev->mode_config.mutex);
 193         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 194                 if (drm_helper_crtc_in_use(crtc))
 195                         crtc->funcs->save(crtc);
 196         }
 197
 198         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 199                 connector->funcs->save(connector);
 200
 201         mutex_unlock(&dev->mode_config.mutex);
 202         return 0;
 203 }
 204
 205 /**
 206  *      psb_restore_display_registers   -       restore lost register state
 207  *      @dev: our DRM device
 208  *
 209  *      Restore register state that was lost during suspend and resume.
 210  */
 211 static int psb_restore_display_registers(struct drm_device *dev)
 212 {
 213         struct drm_psb_private *dev_priv = dev->dev_private;
 214         struct drm_crtc *crtc;
 215         struct drm_connector *connector;
 216
 217         /* Display arbitration + watermarks */
 218         PSB_WVDC32(dev_priv->saveDSPARB, DSPARB);
 219         PSB_WVDC32(dev_priv->saveDSPFW1, DSPFW1);
 220         PSB_WVDC32(dev_priv->saveDSPFW2, DSPFW2);
 221         PSB_WVDC32(dev_priv->saveDSPFW3, DSPFW3);
 222         PSB_WVDC32(dev_priv->saveDSPFW4, DSPFW4);
 223         PSB_WVDC32(dev_priv->saveDSPFW5, DSPFW5);
 224         PSB_WVDC32(dev_priv->saveDSPFW6, DSPFW6);
 225         PSB_WVDC32(dev_priv->saveCHICKENBIT, DSPCHICKENBIT);
 226
 227         /*make sure VGA plane is off. it initializes to on after reset!*/
 228         PSB_WVDC32(0x80000000, VGACNTRL);
 229
 230         mutex_lock(&dev->mode_config.mutex);
 231         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 232                 if (drm_helper_crtc_in_use(crtc))
 233                         crtc->funcs->restore(crtc);
 234
 235         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 236                 connector->funcs->restore(connector);
 237
 238         mutex_unlock(&dev->mode_config.mutex);
 239         return 0;
 240 }
 241
 242 static int psb_power_down(struct drm_device *dev)
 243 {
 244         return 0;
 245 }
 246
 247 static int psb_power_up(struct drm_device *dev)
 248 {
 249         return 0;
 250 }
 251
 252 static void psb_get_core_freq(struct drm_device *dev)
 253 {
 254         uint32_t clock;
 255         struct pci_dev *pci_root = pci_get_bus_and_slot(0, 0);
 256         struct drm_psb_private *dev_priv = dev->dev_private;
 257
 258         /*pci_write_config_dword(pci_root, 0xD4, 0x00C32004);*/
 259         /*pci_write_config_dword(pci_root, 0xD0, 0xE0033000);*/
 260
 261         pci_write_config_dword(pci_root, 0xD0, 0xD0050300);
 262         pci_read_config_dword(pci_root, 0xD4, &clock);
 263         pci_dev_put(pci_root);
 264
 265         switch (clock & 0x07) {
 266         case 0:
 267                 dev_priv->core_freq = 100;
 268                 break;
 269         case 1:
 270                 dev_priv->core_freq = 133;
 271                 break;
 272         case 2:
 273                 dev_priv->core_freq = 150;
 274                 break;
 275         case 3:
 276                 dev_priv->core_freq = 178;
 277                 break;
 278         case 4:
 279                 dev_priv->core_freq = 200;
 280                 break;
 281         case 5:
 282         case 6:
 283         case 7:
 284                 dev_priv->core_freq = 266;
 285         default:
 286                 dev_priv->core_freq = 0;
 287         }
 288 }
 289
 290 static int psb_chip_setup(struct drm_device *dev)
 291 {
 292         psb_get_core_freq(dev);
 293         gma_intel_opregion_init(dev);
 294         psb_intel_init_bios(dev);
 295         return 0;
 296 }
 297
 298 const struct psb_ops psb_chip_ops = {
 299         .name = "Poulsbo",
 300         .accel_2d = 1,
 301         .pipes = 2,
 302         .crtcs = 2,
 303         .sgx_offset = PSB_SGX_OFFSET,
 304         .chip_setup = psb_chip_setup,
 305
 306         .crtc_helper = &psb_intel_helper_funcs,
 307         .crtc_funcs = &psb_intel_crtc_funcs,
 308
 309         .output_init = psb_output_init,
 310
 311 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 312         .backlight_init = psb_backlight_init,
 313 #endif
 314
 315         .init_pm = psb_init_pm,
 316         .save_regs = psb_save_display_registers,
 317         .restore_regs = psb_restore_display_registers,
 318         .power_down = psb_power_down,
 319         .power_up = psb_power_up,
 320 };
 321