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 "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 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 struct psb_state *regs = &dev_priv->regs.psb; 181 182 /* Display arbitration control + watermarks */ 183 regs->saveDSPARB = PSB_RVDC32(DSPARB); 184 regs->saveDSPFW1 = PSB_RVDC32(DSPFW1); 185 regs->saveDSPFW2 = PSB_RVDC32(DSPFW2); 186 regs->saveDSPFW3 = PSB_RVDC32(DSPFW3); 187 regs->saveDSPFW4 = PSB_RVDC32(DSPFW4); 188 regs->saveDSPFW5 = PSB_RVDC32(DSPFW5); 189 regs->saveDSPFW6 = PSB_RVDC32(DSPFW6); 190 regs->saveCHICKENBIT = PSB_RVDC32(DSPCHICKENBIT); 191 192 /* Save crtc and output state */ 193 mutex_lock(&dev->mode_config.mutex); 194 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 195 if (drm_helper_crtc_in_use(crtc)) 196 crtc->funcs->save(crtc); 197 } 198 199 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 200 connector->funcs->save(connector); 201 202 mutex_unlock(&dev->mode_config.mutex); 203 return 0; 204 } 205 206 /** 207 * psb_restore_display_registers - restore lost register state 208 * @dev: our DRM device 209 * 210 * Restore register state that was lost during suspend and resume. 211 */ 212 static int psb_restore_display_registers(struct drm_device *dev) 213 { 214 struct drm_psb_private *dev_priv = dev->dev_private; 215 struct drm_crtc *crtc; 216 struct drm_connector *connector; 217 struct psb_state *regs = &dev_priv->regs.psb; 218 219 /* Display arbitration + watermarks */ 220 PSB_WVDC32(regs->saveDSPARB, DSPARB); 221 PSB_WVDC32(regs->saveDSPFW1, DSPFW1); 222 PSB_WVDC32(regs->saveDSPFW2, DSPFW2); 223 PSB_WVDC32(regs->saveDSPFW3, DSPFW3); 224 PSB_WVDC32(regs->saveDSPFW4, DSPFW4); 225 PSB_WVDC32(regs->saveDSPFW5, DSPFW5); 226 PSB_WVDC32(regs->saveDSPFW6, DSPFW6); 227 PSB_WVDC32(regs->saveCHICKENBIT, DSPCHICKENBIT); 228 229 /*make sure VGA plane is off. it initializes to on after reset!*/ 230 PSB_WVDC32(0x80000000, VGACNTRL); 231 232 mutex_lock(&dev->mode_config.mutex); 233 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) 234 if (drm_helper_crtc_in_use(crtc)) 235 crtc->funcs->restore(crtc); 236 237 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 238 connector->funcs->restore(connector); 239 240 mutex_unlock(&dev->mode_config.mutex); 241 return 0; 242 } 243 244 static int psb_power_down(struct drm_device *dev) 245 { 246 return 0; 247 } 248 249 static int psb_power_up(struct drm_device *dev) 250 { 251 return 0; 252 } 253 254 static void psb_get_core_freq(struct drm_device *dev) 255 { 256 uint32_t clock; 257 struct pci_dev *pci_root = pci_get_bus_and_slot(0, 0); 258 struct drm_psb_private *dev_priv = dev->dev_private; 259 260 /*pci_write_config_dword(pci_root, 0xD4, 0x00C32004);*/ 261 /*pci_write_config_dword(pci_root, 0xD0, 0xE0033000);*/ 262 263 pci_write_config_dword(pci_root, 0xD0, 0xD0050300); 264 pci_read_config_dword(pci_root, 0xD4, &clock); 265 pci_dev_put(pci_root); 266 267 switch (clock & 0x07) { 268 case 0: 269 dev_priv->core_freq = 100; 270 break; 271 case 1: 272 dev_priv->core_freq = 133; 273 break; 274 case 2: 275 dev_priv->core_freq = 150; 276 break; 277 case 3: 278 dev_priv->core_freq = 178; 279 break; 280 case 4: 281 dev_priv->core_freq = 200; 282 break; 283 case 5: 284 case 6: 285 case 7: 286 dev_priv->core_freq = 266; 287 default: 288 dev_priv->core_freq = 0; 289 } 290 } 291 292 static int psb_chip_setup(struct drm_device *dev) 293 { 294 psb_get_core_freq(dev); 295 gma_intel_setup_gmbus(dev); 296 gma_intel_opregion_init(dev); 297 psb_intel_init_bios(dev); 298 return 0; 299 } 300 301 static void psb_chip_teardown(struct drm_device *dev) 302 { 303 gma_intel_teardown_gmbus(dev); 304 } 305 306 const struct psb_ops psb_chip_ops = { 307 .name = "Poulsbo", 308 .accel_2d = 1, 309 .pipes = 2, 310 .crtcs = 2, 311 .sgx_offset = PSB_SGX_OFFSET, 312 .chip_setup = psb_chip_setup, 313 .chip_teardown = psb_chip_teardown, 314 315 .crtc_helper = &psb_intel_helper_funcs, 316 .crtc_funcs = &psb_intel_crtc_funcs, 317 318 .output_init = psb_output_init, 319 320 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 321 .backlight_init = psb_backlight_init, 322 #endif 323 324 .init_pm = psb_init_pm, 325 .save_regs = psb_save_display_registers, 326 .restore_regs = psb_restore_display_registers, 327 .power_down = psb_power_down, 328 .power_up = psb_power_up, 329 }; 330 331