1 /**************************************************************************
2 * Copyright (c) 2011, Intel Corporation.
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.
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
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.
18 **************************************************************************/
20 #include <linux/backlight.h>
23 #include <drm/gma_drm.h>
26 #include "psb_intel_reg.h"
27 #include "intel_bios.h"
28 #include "psb_device.h"
29 #include "gma_device.h"
31 static int psb_output_init(struct drm_device *dev)
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);
39 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
42 * Poulsbo Backlight Interfaces
45 #define BLC_PWM_PRECISION_FACTOR 100 /* 10000000 */
46 #define BLC_PWM_FREQ_CALC_CONSTANT 32
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
53 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
54 #define PSB_BACKLIGHT_PWM_CTL_SHIFT (16)
56 static int psb_brightness;
57 static struct backlight_device *psb_backlight_device;
59 static int psb_get_brightness(struct backlight_device *bd)
61 /* return locally cached var instead of HW read (due to DPST etc.) */
62 /* FIXME: ideally return actual value in case firmware fiddled with
64 return psb_brightness;
68 static int psb_backlight_setup(struct drm_device *dev)
70 struct drm_psb_private *dev_priv = dev->dev_private;
71 unsigned long core_clock;
72 /* u32 bl_max_freq; */
73 /* unsigned long value; */
76 uint32_t blc_pwm_precision_factor;
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");
83 bl_max_freq = dev_priv->lvds_bl->freq;
84 blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR;
86 core_clock = dev_priv->core_freq;
88 value = (core_clock * MHz) / BLC_PWM_FREQ_CALC_CONSTANT;
89 value *= blc_pwm_precision_factor;
91 value /= blc_pwm_precision_factor;
93 if (value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ ||
94 value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ)
97 value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
98 REG_WRITE(BLC_PWM_CTL,
99 (value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | (value));
104 static int psb_set_brightness(struct backlight_device *bd)
106 struct drm_device *dev = bl_get_data(psb_backlight_device);
107 int level = bd->props.brightness;
109 /* Percentage 1-100% being valid */
113 psb_intel_lvds_set_brightness(dev, level);
114 psb_brightness = level;
118 static const struct backlight_ops psb_ops = {
119 .get_brightness = psb_get_brightness,
120 .update_status = psb_set_brightness,
123 static int psb_backlight_init(struct drm_device *dev)
125 struct drm_psb_private *dev_priv = dev->dev_private;
127 struct backlight_properties props;
129 memset(&props, 0, sizeof(struct backlight_properties));
130 props.max_brightness = 100;
131 props.type = BACKLIGHT_PLATFORM;
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);
138 ret = psb_backlight_setup(dev);
140 backlight_device_unregister(psb_backlight_device);
141 psb_backlight_device = NULL;
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;
149 /* This must occur after the backlight is properly initialised */
150 psb_lid_timer_init(dev_priv);
158 * Provide the Poulsbo specific chip logic and low level methods
159 * for power management
162 static void psb_init_pm(struct drm_device *dev)
164 struct drm_psb_private *dev_priv = dev->dev_private;
166 u32 gating = PSB_RSGX32(PSB_CR_CLKGATECTL);
167 gating &= ~3; /* Disable 2D clock gating */
169 PSB_WSGX32(gating, PSB_CR_CLKGATECTL);
170 PSB_RSGX32(PSB_CR_CLKGATECTL);
174 * psb_save_display_registers - save registers lost on suspend
175 * @dev: our DRM device
177 * Save the state we need in order to be able to restore the interface
178 * upon resume from suspend
180 static int psb_save_display_registers(struct drm_device *dev)
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;
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);
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);
204 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
205 if (connector->funcs->save)
206 connector->funcs->save(connector);
208 drm_modeset_unlock_all(dev);
213 * psb_restore_display_registers - restore lost register state
214 * @dev: our DRM device
216 * Restore register state that was lost during suspend and resume.
218 static int psb_restore_display_registers(struct drm_device *dev)
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;
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);
235 /*make sure VGA plane is off. it initializes to on after reset!*/
236 PSB_WVDC32(0x80000000, VGACNTRL);
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);
243 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
244 if (connector->funcs->restore)
245 connector->funcs->restore(connector);
247 drm_modeset_unlock_all(dev);
251 static int psb_power_down(struct drm_device *dev)
256 static int psb_power_up(struct drm_device *dev)
262 static const struct psb_offset psb_regmap[2] = {
276 .stride = DSPASTRIDE,
283 .linoff = DSPALINOFF,
284 .tileoff = DSPATILEOFF,
285 .palette = PALETTE_A,
300 .stride = DSPBSTRIDE,
307 .linoff = DSPBLINOFF,
308 .tileoff = DSPBTILEOFF,
309 .palette = PALETTE_B,
313 static int psb_chip_setup(struct drm_device *dev)
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);
324 static void psb_chip_teardown(struct drm_device *dev)
326 struct drm_psb_private *dev_priv = dev->dev_private;
327 psb_lid_timer_takedown(dev_priv);
328 gma_intel_teardown_gmbus(dev);
331 const struct psb_ops psb_chip_ops = {
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,
344 .crtc_helper = &psb_intel_helper_funcs,
345 .crtc_funcs = &psb_intel_crtc_funcs,
346 .clock_funcs = &psb_clock_funcs,
348 .output_init = psb_output_init,
350 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
351 .backlight_init = psb_backlight_init,
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,