kernel/drivers/gpu/drm/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 <drm/gma_drm.h>
  24 #include "psb_drv.h"
  25 #include "psb_reg.h"
  26 #include "psb_intel_reg.h"
  27 #include "intel_bios.h"
  28 #include "psb_device.h"
  29 #include "gma_device.h"
  30
  31 static int psb_output_init(struct drm_device *dev)
  32 {
  33         struct drm_psb_private *dev_priv = dev->dev_private;
  34         psb_intel_lvds_init(dev, &dev_priv->mode_dev);
  35         psb_intel_sdvo_init(dev, SDVOB);
  36         return 0;
  37 }
  38
  39 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
  40
  41 /*
  42  *      Poulsbo Backlight Interfaces
  43  */
  44
  45 #define BLC_PWM_PRECISION_FACTOR 100    /* 10000000 */
  46 #define BLC_PWM_FREQ_CALC_CONSTANT 32
  47 #define MHz 1000000
  48
  49 #define PSB_BLC_PWM_PRECISION_FACTOR    10
  50 #define PSB_BLC_MAX_PWM_REG_FREQ        0xFFFE
  51 #define PSB_BLC_MIN_PWM_REG_FREQ        0x2
  52
  53 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
  54 #define PSB_BACKLIGHT_PWM_CTL_SHIFT     (16)
  55
  56 static int psb_brightness;
  57 static struct backlight_device *psb_backlight_device;
  58
  59 static int psb_get_brightness(struct backlight_device *bd)
  60 {
  61         /* return locally cached var instead of HW read (due to DPST etc.) */
  62         /* FIXME: ideally return actual value in case firmware fiddled with
  63            it */
  64         return psb_brightness;
  65 }
  66
  67
  68 static int psb_backlight_setup(struct drm_device *dev)
  69 {
  70         struct drm_psb_private *dev_priv = dev->dev_private;
  71         unsigned long core_clock;
  72         /* u32 bl_max_freq; */
  73         /* unsigned long value; */
  74         u16 bl_max_freq;
  75         uint32_t value;
  76         uint32_t blc_pwm_precision_factor;
  77
  78         /* get bl_max_freq and pol from dev_priv*/
  79         if (!dev_priv->lvds_bl) {
  80                 dev_err(dev->dev, "Has no valid LVDS backlight info\n");
  81                 return -ENOENT;
  82         }
  83         bl_max_freq = dev_priv->lvds_bl->freq;
  84         blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR;
  85
  86         core_clock = dev_priv->core_freq;
  87
  88         value = (core_clock * MHz) / BLC_PWM_FREQ_CALC_CONSTANT;
  89         value *= blc_pwm_precision_factor;
  90         value /= bl_max_freq;
  91         value /= blc_pwm_precision_factor;
  92
  93         if (value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ ||
  94                  value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ)
  95                                 return -ERANGE;
  96         else {
  97                 value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
  98                 REG_WRITE(BLC_PWM_CTL,
  99                         (value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | (value));
 100         }
 101         return 0;
 102 }
 103
 104 static int psb_set_brightness(struct backlight_device *bd)
 105 {
 106         struct drm_device *dev = bl_get_data(psb_backlight_device);
 107         int level = bd->props.brightness;
 108
 109         /* Percentage 1-100% being valid */
 110         if (level < 1)
 111                 level = 1;
 112
 113         psb_intel_lvds_set_brightness(dev, level);
 114         psb_brightness = level;
 115         return 0;
 116 }
 117
 118 static const struct backlight_ops psb_ops = {
 119         .get_brightness = psb_get_brightness,
 120         .update_status  = psb_set_brightness,
 121 };
 122
 123 static int psb_backlight_init(struct drm_device *dev)
 124 {
 125         struct drm_psb_private *dev_priv = dev->dev_private;
 126         int ret;
 127         struct backlight_properties props;
 128
 129         memset(&props, 0, sizeof(struct backlight_properties));
 130         props.max_brightness = 100;
 131         props.type = BACKLIGHT_PLATFORM;
 132
 133         psb_backlight_device = backlight_device_register("psb-bl",
 134                                         NULL, (void *)dev, &psb_ops, &props);
 135         if (IS_ERR(psb_backlight_device))
 136                 return PTR_ERR(psb_backlight_device);
 137
 138         ret = psb_backlight_setup(dev);
 139         if (ret < 0) {
 140                 backlight_device_unregister(psb_backlight_device);
 141                 psb_backlight_device = NULL;
 142                 return ret;
 143         }
 144         psb_backlight_device->props.brightness = 100;
 145         psb_backlight_device->props.max_brightness = 100;
 146         backlight_update_status(psb_backlight_device);
 147         dev_priv->backlight_device = psb_backlight_device;
 148
 149         /* This must occur after the backlight is properly initialised */
 150         psb_lid_timer_init(dev_priv);
 151
 152         return 0;
 153 }
 154
 155 #endif
 156
 157 /*
 158  *      Provide the Poulsbo specific chip logic and low level methods
 159  *      for power management
 160  */
 161
 162 static void psb_init_pm(struct drm_device *dev)
 163 {
 164         struct drm_psb_private *dev_priv = dev->dev_private;
 165
 166         u32 gating = PSB_RSGX32(PSB_CR_CLKGATECTL);
 167         gating &= ~3;   /* Disable 2D clock gating */
 168         gating |= 1;
 169         PSB_WSGX32(gating, PSB_CR_CLKGATECTL);
 170         PSB_RSGX32(PSB_CR_CLKGATECTL);
 171 }
 172
 173 /**
 174  *      psb_save_display_registers      -       save registers lost on suspend
 175  *      @dev: our DRM device
 176  *
 177  *      Save the state we need in order to be able to restore the interface
 178  *      upon resume from suspend
 179  */
 180 static int psb_save_display_registers(struct drm_device *dev)
 181 {
 182         struct drm_psb_private *dev_priv = dev->dev_private;
 183         struct drm_crtc *crtc;
 184         struct drm_connector *connector;
 185         struct psb_state *regs = &dev_priv->regs.psb;
 186
 187         /* Display arbitration control + watermarks */
 188         regs->saveDSPARB = PSB_RVDC32(DSPARB);
 189         regs->saveDSPFW1 = PSB_RVDC32(DSPFW1);
 190         regs->saveDSPFW2 = PSB_RVDC32(DSPFW2);
 191         regs->saveDSPFW3 = PSB_RVDC32(DSPFW3);
 192         regs->saveDSPFW4 = PSB_RVDC32(DSPFW4);
 193         regs->saveDSPFW5 = PSB_RVDC32(DSPFW5);
 194         regs->saveDSPFW6 = PSB_RVDC32(DSPFW6);
 195         regs->saveCHICKENBIT = PSB_RVDC32(DSPCHICKENBIT);
 196
 197         /* Save crtc and output state */
 198         drm_modeset_lock_all(dev);
 199         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 200                 if (drm_helper_crtc_in_use(crtc))
 201                         crtc->funcs->save(crtc);
 202         }
 203
 204         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 205                 if (connector->funcs->save)
 206                         connector->funcs->save(connector);
 207
 208         drm_modeset_unlock_all(dev);
 209         return 0;
 210 }
 211
 212 /**
 213  *      psb_restore_display_registers   -       restore lost register state
 214  *      @dev: our DRM device
 215  *
 216  *      Restore register state that was lost during suspend and resume.
 217  */
 218 static int psb_restore_display_registers(struct drm_device *dev)
 219 {
 220         struct drm_psb_private *dev_priv = dev->dev_private;
 221         struct drm_crtc *crtc;
 222         struct drm_connector *connector;
 223         struct psb_state *regs = &dev_priv->regs.psb;
 224
 225         /* Display arbitration + watermarks */
 226         PSB_WVDC32(regs->saveDSPARB, DSPARB);
 227         PSB_WVDC32(regs->saveDSPFW1, DSPFW1);
 228         PSB_WVDC32(regs->saveDSPFW2, DSPFW2);
 229         PSB_WVDC32(regs->saveDSPFW3, DSPFW3);
 230         PSB_WVDC32(regs->saveDSPFW4, DSPFW4);
 231         PSB_WVDC32(regs->saveDSPFW5, DSPFW5);
 232         PSB_WVDC32(regs->saveDSPFW6, DSPFW6);
 233         PSB_WVDC32(regs->saveCHICKENBIT, DSPCHICKENBIT);
 234
 235         /*make sure VGA plane is off. it initializes to on after reset!*/
 236         PSB_WVDC32(0x80000000, VGACNTRL);
 237
 238         drm_modeset_lock_all(dev);
 239         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 240                 if (drm_helper_crtc_in_use(crtc))
 241                         crtc->funcs->restore(crtc);
 242
 243         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
 244                 if (connector->funcs->restore)
 245                         connector->funcs->restore(connector);
 246
 247         drm_modeset_unlock_all(dev);
 248         return 0;
 249 }
 250
 251 static int psb_power_down(struct drm_device *dev)
 252 {
 253         return 0;
 254 }
 255
 256 static int psb_power_up(struct drm_device *dev)
 257 {
 258         return 0;
 259 }
 260
 261 /* Poulsbo */
 262 static const struct psb_offset psb_regmap[2] = {
 263         {
 264                 .fp0 = FPA0,
 265                 .fp1 = FPA1,
 266                 .cntr = DSPACNTR,
 267                 .conf = PIPEACONF,
 268                 .src = PIPEASRC,
 269                 .dpll = DPLL_A,
 270                 .htotal = HTOTAL_A,
 271                 .hblank = HBLANK_A,
 272                 .hsync = HSYNC_A,
 273                 .vtotal = VTOTAL_A,
 274                 .vblank = VBLANK_A,
 275                 .vsync = VSYNC_A,
 276                 .stride = DSPASTRIDE,
 277                 .size = DSPASIZE,
 278                 .pos = DSPAPOS,
 279                 .base = DSPABASE,
 280                 .surf = DSPASURF,
 281                 .addr = DSPABASE,
 282                 .status = PIPEASTAT,
 283                 .linoff = DSPALINOFF,
 284                 .tileoff = DSPATILEOFF,
 285                 .palette = PALETTE_A,
 286         },
 287         {
 288                 .fp0 = FPB0,
 289                 .fp1 = FPB1,
 290                 .cntr = DSPBCNTR,
 291                 .conf = PIPEBCONF,
 292                 .src = PIPEBSRC,
 293                 .dpll = DPLL_B,
 294                 .htotal = HTOTAL_B,
 295                 .hblank = HBLANK_B,
 296                 .hsync = HSYNC_B,
 297                 .vtotal = VTOTAL_B,
 298                 .vblank = VBLANK_B,
 299                 .vsync = VSYNC_B,
 300                 .stride = DSPBSTRIDE,
 301                 .size = DSPBSIZE,
 302                 .pos = DSPBPOS,
 303                 .base = DSPBBASE,
 304                 .surf = DSPBSURF,
 305                 .addr = DSPBBASE,
 306                 .status = PIPEBSTAT,
 307                 .linoff = DSPBLINOFF,
 308                 .tileoff = DSPBTILEOFF,
 309                 .palette = PALETTE_B,
 310         }
 311 };
 312
 313 static int psb_chip_setup(struct drm_device *dev)
 314 {
 315         struct drm_psb_private *dev_priv = dev->dev_private;
 316         dev_priv->regmap = psb_regmap;
 317         gma_get_core_freq(dev);
 318         gma_intel_setup_gmbus(dev);
 319         psb_intel_opregion_init(dev);
 320         psb_intel_init_bios(dev);
 321         return 0;
 322 }
 323
 324 static void psb_chip_teardown(struct drm_device *dev)
 325 {
 326         struct drm_psb_private *dev_priv = dev->dev_private;
 327         psb_lid_timer_takedown(dev_priv);
 328         gma_intel_teardown_gmbus(dev);
 329 }
 330
 331 const struct psb_ops psb_chip_ops = {
 332         .name = "Poulsbo",
 333         .accel_2d = 1,
 334         .pipes = 2,
 335         .crtcs = 2,
 336         .hdmi_mask = (1 << 0),
 337         .lvds_mask = (1 << 1),
 338         .sdvo_mask = (1 << 0),
 339         .cursor_needs_phys = 1,
 340         .sgx_offset = PSB_SGX_OFFSET,
 341         .chip_setup = psb_chip_setup,
 342         .chip_teardown = psb_chip_teardown,
 343
 344         .crtc_helper = &psb_intel_helper_funcs,
 345         .crtc_funcs = &psb_intel_crtc_funcs,
 346         .clock_funcs = &psb_clock_funcs,
 347
 348         .output_init = psb_output_init,
 349
 350 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 351         .backlight_init = psb_backlight_init,
 352 #endif
 353
 354         .init_pm = psb_init_pm,
 355         .save_regs = psb_save_display_registers,
 356         .restore_regs = psb_restore_display_registers,
 357         .power_down = psb_power_down,
 358         .power_up = psb_power_up,
 359 };
 360