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 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; 147 148 /* This must occur after the backlight is properly initialised */ 149 psb_lid_timer_init(dev_priv); 150 151 return 0; 152 } 153 154 #endif 155 156 /* 157 * Provide the Poulsbo specific chip logic and low level methods 158 * for power management 159 */ 160 161 static void psb_init_pm(struct drm_device *dev) 162 { 163 struct drm_psb_private *dev_priv = dev->dev_private; 164 165 u32 gating = PSB_RSGX32(PSB_CR_CLKGATECTL); 166 gating &= ~3; /* Disable 2D clock gating */ 167 gating |= 1; 168 PSB_WSGX32(gating, PSB_CR_CLKGATECTL); 169 PSB_RSGX32(PSB_CR_CLKGATECTL); 170 } 171 172 /** 173 * psb_save_display_registers - save registers lost on suspend 174 * @dev: our DRM device 175 * 176 * Save the state we need in order to be able to restore the interface 177 * upon resume from suspend 178 */ 179 static int psb_save_display_registers(struct drm_device *dev) 180 { 181 struct drm_psb_private *dev_priv = dev->dev_private; 182 struct drm_crtc *crtc; 183 struct drm_connector *connector; 184 struct psb_state *regs = &dev_priv->regs.psb; 185 186 /* Display arbitration control + watermarks */ 187 regs->saveDSPARB = PSB_RVDC32(DSPARB); 188 regs->saveDSPFW1 = PSB_RVDC32(DSPFW1); 189 regs->saveDSPFW2 = PSB_RVDC32(DSPFW2); 190 regs->saveDSPFW3 = PSB_RVDC32(DSPFW3); 191 regs->saveDSPFW4 = PSB_RVDC32(DSPFW4); 192 regs->saveDSPFW5 = PSB_RVDC32(DSPFW5); 193 regs->saveDSPFW6 = PSB_RVDC32(DSPFW6); 194 regs->saveCHICKENBIT = PSB_RVDC32(DSPCHICKENBIT); 195 196 /* Save crtc and output state */ 197 drm_modeset_lock_all(dev); 198 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 199 if (drm_helper_crtc_in_use(crtc)) 200 crtc->funcs->save(crtc); 201 } 202 203 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 204 if (connector->funcs->save) 205 connector->funcs->save(connector); 206 207 drm_modeset_unlock_all(dev); 208 return 0; 209 } 210 211 /** 212 * psb_restore_display_registers - restore lost register state 213 * @dev: our DRM device 214 * 215 * Restore register state that was lost during suspend and resume. 216 */ 217 static int psb_restore_display_registers(struct drm_device *dev) 218 { 219 struct drm_psb_private *dev_priv = dev->dev_private; 220 struct drm_crtc *crtc; 221 struct drm_connector *connector; 222 struct psb_state *regs = &dev_priv->regs.psb; 223 224 /* Display arbitration + watermarks */ 225 PSB_WVDC32(regs->saveDSPARB, DSPARB); 226 PSB_WVDC32(regs->saveDSPFW1, DSPFW1); 227 PSB_WVDC32(regs->saveDSPFW2, DSPFW2); 228 PSB_WVDC32(regs->saveDSPFW3, DSPFW3); 229 PSB_WVDC32(regs->saveDSPFW4, DSPFW4); 230 PSB_WVDC32(regs->saveDSPFW5, DSPFW5); 231 PSB_WVDC32(regs->saveDSPFW6, DSPFW6); 232 PSB_WVDC32(regs->saveCHICKENBIT, DSPCHICKENBIT); 233 234 /*make sure VGA plane is off. it initializes to on after reset!*/ 235 PSB_WVDC32(0x80000000, VGACNTRL); 236 237 drm_modeset_lock_all(dev); 238 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) 239 if (drm_helper_crtc_in_use(crtc)) 240 crtc->funcs->restore(crtc); 241 242 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 243 if (connector->funcs->restore) 244 connector->funcs->restore(connector); 245 246 drm_modeset_unlock_all(dev); 247 return 0; 248 } 249 250 static int psb_power_down(struct drm_device *dev) 251 { 252 return 0; 253 } 254 255 static int psb_power_up(struct drm_device *dev) 256 { 257 return 0; 258 } 259 260 static void psb_get_core_freq(struct drm_device *dev) 261 { 262 uint32_t clock; 263 struct pci_dev *pci_root = pci_get_bus_and_slot(0, 0); 264 struct drm_psb_private *dev_priv = dev->dev_private; 265 266 /*pci_write_config_dword(pci_root, 0xD4, 0x00C32004);*/ 267 /*pci_write_config_dword(pci_root, 0xD0, 0xE0033000);*/ 268 269 pci_write_config_dword(pci_root, 0xD0, 0xD0050300); 270 pci_read_config_dword(pci_root, 0xD4, &clock); 271 pci_dev_put(pci_root); 272 273 switch (clock & 0x07) { 274 case 0: 275 dev_priv->core_freq = 100; 276 break; 277 case 1: 278 dev_priv->core_freq = 133; 279 break; 280 case 2: 281 dev_priv->core_freq = 150; 282 break; 283 case 3: 284 dev_priv->core_freq = 178; 285 break; 286 case 4: 287 dev_priv->core_freq = 200; 288 break; 289 case 5: 290 case 6: 291 case 7: 292 dev_priv->core_freq = 266; 293 break; 294 default: 295 dev_priv->core_freq = 0; 296 } 297 } 298 299 /* Poulsbo */ 300 static const struct psb_offset psb_regmap[2] = { 301 { 302 .fp0 = FPA0, 303 .fp1 = FPA1, 304 .cntr = DSPACNTR, 305 .conf = PIPEACONF, 306 .src = PIPEASRC, 307 .dpll = DPLL_A, 308 .htotal = HTOTAL_A, 309 .hblank = HBLANK_A, 310 .hsync = HSYNC_A, 311 .vtotal = VTOTAL_A, 312 .vblank = VBLANK_A, 313 .vsync = VSYNC_A, 314 .stride = DSPASTRIDE, 315 .size = DSPASIZE, 316 .pos = DSPAPOS, 317 .base = DSPABASE, 318 .surf = DSPASURF, 319 .addr = DSPABASE, 320 .status = PIPEASTAT, 321 .linoff = DSPALINOFF, 322 .tileoff = DSPATILEOFF, 323 .palette = PALETTE_A, 324 }, 325 { 326 .fp0 = FPB0, 327 .fp1 = FPB1, 328 .cntr = DSPBCNTR, 329 .conf = PIPEBCONF, 330 .src = PIPEBSRC, 331 .dpll = DPLL_B, 332 .htotal = HTOTAL_B, 333 .hblank = HBLANK_B, 334 .hsync = HSYNC_B, 335 .vtotal = VTOTAL_B, 336 .vblank = VBLANK_B, 337 .vsync = VSYNC_B, 338 .stride = DSPBSTRIDE, 339 .size = DSPBSIZE, 340 .pos = DSPBPOS, 341 .base = DSPBBASE, 342 .surf = DSPBSURF, 343 .addr = DSPBBASE, 344 .status = PIPEBSTAT, 345 .linoff = DSPBLINOFF, 346 .tileoff = DSPBTILEOFF, 347 .palette = PALETTE_B, 348 } 349 }; 350 351 static int psb_chip_setup(struct drm_device *dev) 352 { 353 struct drm_psb_private *dev_priv = dev->dev_private; 354 dev_priv->regmap = psb_regmap; 355 psb_get_core_freq(dev); 356 gma_intel_setup_gmbus(dev); 357 psb_intel_opregion_init(dev); 358 psb_intel_init_bios(dev); 359 return 0; 360 } 361 362 static void psb_chip_teardown(struct drm_device *dev) 363 { 364 struct drm_psb_private *dev_priv = dev->dev_private; 365 psb_lid_timer_takedown(dev_priv); 366 gma_intel_teardown_gmbus(dev); 367 } 368 369 const struct psb_ops psb_chip_ops = { 370 .name = "Poulsbo", 371 .accel_2d = 1, 372 .pipes = 2, 373 .crtcs = 2, 374 .hdmi_mask = (1 << 0), 375 .lvds_mask = (1 << 1), 376 .sdvo_mask = (1 << 0), 377 .cursor_needs_phys = 1, 378 .sgx_offset = PSB_SGX_OFFSET, 379 .chip_setup = psb_chip_setup, 380 .chip_teardown = psb_chip_teardown, 381 382 .crtc_helper = &psb_intel_helper_funcs, 383 .crtc_funcs = &psb_intel_crtc_funcs, 384 .clock_funcs = &psb_clock_funcs, 385 386 .output_init = psb_output_init, 387 388 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 389 .backlight_init = psb_backlight_init, 390 #endif 391 392 .init_pm = psb_init_pm, 393 .save_regs = psb_save_display_registers, 394 .restore_regs = psb_restore_display_registers, 395 .power_down = psb_power_down, 396 .power_up = psb_power_up, 397 }; 398 399