1 // SPDX-License-Identifier: GPL-2.0-only
2 /**************************************************************************
3 * Copyright (c) 2011, Intel Corporation.
4 * All Rights Reserved.
5 *
6 **************************************************************************/
7
8 #include <linux/backlight.h>
9
10 #include <drm/drm.h>
11
12 #include "gma_device.h"
13 #include "intel_bios.h"
14 #include "psb_device.h"
15 #include "psb_drv.h"
16 #include "psb_intel_reg.h"
17 #include "psb_reg.h"
18
psb_output_init(struct drm_device * dev)19 static int psb_output_init(struct drm_device *dev)
20 {
21 struct drm_psb_private *dev_priv = dev->dev_private;
22 psb_intel_lvds_init(dev, &dev_priv->mode_dev);
23 psb_intel_sdvo_init(dev, SDVOB);
24 return 0;
25 }
26
27 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
28
29 /*
30 * Poulsbo Backlight Interfaces
31 */
32
33 #define BLC_PWM_PRECISION_FACTOR 100 /* 10000000 */
34 #define BLC_PWM_FREQ_CALC_CONSTANT 32
35 #define MHz 1000000
36
37 #define PSB_BLC_PWM_PRECISION_FACTOR 10
38 #define PSB_BLC_MAX_PWM_REG_FREQ 0xFFFE
39 #define PSB_BLC_MIN_PWM_REG_FREQ 0x2
40
41 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
42 #define PSB_BACKLIGHT_PWM_CTL_SHIFT (16)
43
44 static int psb_brightness;
45 static struct backlight_device *psb_backlight_device;
46
psb_get_brightness(struct backlight_device * bd)47 static int psb_get_brightness(struct backlight_device *bd)
48 {
49 /* return locally cached var instead of HW read (due to DPST etc.) */
50 /* FIXME: ideally return actual value in case firmware fiddled with
51 it */
52 return psb_brightness;
53 }
54
55
psb_backlight_setup(struct drm_device * dev)56 static int psb_backlight_setup(struct drm_device *dev)
57 {
58 struct drm_psb_private *dev_priv = dev->dev_private;
59 unsigned long core_clock;
60 /* u32 bl_max_freq; */
61 /* unsigned long value; */
62 u16 bl_max_freq;
63 uint32_t value;
64 uint32_t blc_pwm_precision_factor;
65
66 /* get bl_max_freq and pol from dev_priv*/
67 if (!dev_priv->lvds_bl) {
68 dev_err(dev->dev, "Has no valid LVDS backlight info\n");
69 return -ENOENT;
70 }
71 bl_max_freq = dev_priv->lvds_bl->freq;
72 blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR;
73
74 core_clock = dev_priv->core_freq;
75
76 value = (core_clock * MHz) / BLC_PWM_FREQ_CALC_CONSTANT;
77 value *= blc_pwm_precision_factor;
78 value /= bl_max_freq;
79 value /= blc_pwm_precision_factor;
80
81 if (value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ ||
82 value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ)
83 return -ERANGE;
84 else {
85 value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
86 REG_WRITE(BLC_PWM_CTL,
87 (value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | (value));
88 }
89 return 0;
90 }
91
psb_set_brightness(struct backlight_device * bd)92 static int psb_set_brightness(struct backlight_device *bd)
93 {
94 struct drm_device *dev = bl_get_data(psb_backlight_device);
95 int level = bd->props.brightness;
96
97 /* Percentage 1-100% being valid */
98 if (level < 1)
99 level = 1;
100
101 psb_intel_lvds_set_brightness(dev, level);
102 psb_brightness = level;
103 return 0;
104 }
105
106 static const struct backlight_ops psb_ops = {
107 .get_brightness = psb_get_brightness,
108 .update_status = psb_set_brightness,
109 };
110
psb_backlight_init(struct drm_device * dev)111 static int psb_backlight_init(struct drm_device *dev)
112 {
113 struct drm_psb_private *dev_priv = dev->dev_private;
114 int ret;
115 struct backlight_properties props;
116
117 memset(&props, 0, sizeof(struct backlight_properties));
118 props.max_brightness = 100;
119 props.type = BACKLIGHT_PLATFORM;
120
121 psb_backlight_device = backlight_device_register("psb-bl",
122 NULL, (void *)dev, &psb_ops, &props);
123 if (IS_ERR(psb_backlight_device))
124 return PTR_ERR(psb_backlight_device);
125
126 ret = psb_backlight_setup(dev);
127 if (ret < 0) {
128 backlight_device_unregister(psb_backlight_device);
129 psb_backlight_device = NULL;
130 return ret;
131 }
132 psb_backlight_device->props.brightness = 100;
133 psb_backlight_device->props.max_brightness = 100;
134 backlight_update_status(psb_backlight_device);
135 dev_priv->backlight_device = psb_backlight_device;
136
137 /* This must occur after the backlight is properly initialised */
138 psb_lid_timer_init(dev_priv);
139
140 return 0;
141 }
142
143 #endif
144
145 /*
146 * Provide the Poulsbo specific chip logic and low level methods
147 * for power management
148 */
149
psb_init_pm(struct drm_device * dev)150 static void psb_init_pm(struct drm_device *dev)
151 {
152 struct drm_psb_private *dev_priv = dev->dev_private;
153
154 u32 gating = PSB_RSGX32(PSB_CR_CLKGATECTL);
155 gating &= ~3; /* Disable 2D clock gating */
156 gating |= 1;
157 PSB_WSGX32(gating, PSB_CR_CLKGATECTL);
158 PSB_RSGX32(PSB_CR_CLKGATECTL);
159 }
160
161 /**
162 * psb_save_display_registers - save registers lost on suspend
163 * @dev: our DRM device
164 *
165 * Save the state we need in order to be able to restore the interface
166 * upon resume from suspend
167 */
psb_save_display_registers(struct drm_device * dev)168 static int psb_save_display_registers(struct drm_device *dev)
169 {
170 struct drm_psb_private *dev_priv = dev->dev_private;
171 struct drm_crtc *crtc;
172 struct gma_connector *connector;
173 struct psb_state *regs = &dev_priv->regs.psb;
174
175 /* Display arbitration control + watermarks */
176 regs->saveDSPARB = PSB_RVDC32(DSPARB);
177 regs->saveDSPFW1 = PSB_RVDC32(DSPFW1);
178 regs->saveDSPFW2 = PSB_RVDC32(DSPFW2);
179 regs->saveDSPFW3 = PSB_RVDC32(DSPFW3);
180 regs->saveDSPFW4 = PSB_RVDC32(DSPFW4);
181 regs->saveDSPFW5 = PSB_RVDC32(DSPFW5);
182 regs->saveDSPFW6 = PSB_RVDC32(DSPFW6);
183 regs->saveCHICKENBIT = PSB_RVDC32(DSPCHICKENBIT);
184
185 /* Save crtc and output state */
186 drm_modeset_lock_all(dev);
187 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
188 if (drm_helper_crtc_in_use(crtc))
189 dev_priv->ops->save_crtc(crtc);
190 }
191
192 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
193 if (connector->save)
194 connector->save(&connector->base);
195
196 drm_modeset_unlock_all(dev);
197 return 0;
198 }
199
200 /**
201 * psb_restore_display_registers - restore lost register state
202 * @dev: our DRM device
203 *
204 * Restore register state that was lost during suspend and resume.
205 */
psb_restore_display_registers(struct drm_device * dev)206 static int psb_restore_display_registers(struct drm_device *dev)
207 {
208 struct drm_psb_private *dev_priv = dev->dev_private;
209 struct drm_crtc *crtc;
210 struct gma_connector *connector;
211 struct psb_state *regs = &dev_priv->regs.psb;
212
213 /* Display arbitration + watermarks */
214 PSB_WVDC32(regs->saveDSPARB, DSPARB);
215 PSB_WVDC32(regs->saveDSPFW1, DSPFW1);
216 PSB_WVDC32(regs->saveDSPFW2, DSPFW2);
217 PSB_WVDC32(regs->saveDSPFW3, DSPFW3);
218 PSB_WVDC32(regs->saveDSPFW4, DSPFW4);
219 PSB_WVDC32(regs->saveDSPFW5, DSPFW5);
220 PSB_WVDC32(regs->saveDSPFW6, DSPFW6);
221 PSB_WVDC32(regs->saveCHICKENBIT, DSPCHICKENBIT);
222
223 /*make sure VGA plane is off. it initializes to on after reset!*/
224 PSB_WVDC32(0x80000000, VGACNTRL);
225
226 drm_modeset_lock_all(dev);
227 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
228 if (drm_helper_crtc_in_use(crtc))
229 dev_priv->ops->restore_crtc(crtc);
230
231 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
232 if (connector->restore)
233 connector->restore(&connector->base);
234
235 drm_modeset_unlock_all(dev);
236 return 0;
237 }
238
psb_power_down(struct drm_device * dev)239 static int psb_power_down(struct drm_device *dev)
240 {
241 return 0;
242 }
243
psb_power_up(struct drm_device * dev)244 static int psb_power_up(struct drm_device *dev)
245 {
246 return 0;
247 }
248
249 /* Poulsbo */
250 static const struct psb_offset psb_regmap[2] = {
251 {
252 .fp0 = FPA0,
253 .fp1 = FPA1,
254 .cntr = DSPACNTR,
255 .conf = PIPEACONF,
256 .src = PIPEASRC,
257 .dpll = DPLL_A,
258 .htotal = HTOTAL_A,
259 .hblank = HBLANK_A,
260 .hsync = HSYNC_A,
261 .vtotal = VTOTAL_A,
262 .vblank = VBLANK_A,
263 .vsync = VSYNC_A,
264 .stride = DSPASTRIDE,
265 .size = DSPASIZE,
266 .pos = DSPAPOS,
267 .base = DSPABASE,
268 .surf = DSPASURF,
269 .addr = DSPABASE,
270 .status = PIPEASTAT,
271 .linoff = DSPALINOFF,
272 .tileoff = DSPATILEOFF,
273 .palette = PALETTE_A,
274 },
275 {
276 .fp0 = FPB0,
277 .fp1 = FPB1,
278 .cntr = DSPBCNTR,
279 .conf = PIPEBCONF,
280 .src = PIPEBSRC,
281 .dpll = DPLL_B,
282 .htotal = HTOTAL_B,
283 .hblank = HBLANK_B,
284 .hsync = HSYNC_B,
285 .vtotal = VTOTAL_B,
286 .vblank = VBLANK_B,
287 .vsync = VSYNC_B,
288 .stride = DSPBSTRIDE,
289 .size = DSPBSIZE,
290 .pos = DSPBPOS,
291 .base = DSPBBASE,
292 .surf = DSPBSURF,
293 .addr = DSPBBASE,
294 .status = PIPEBSTAT,
295 .linoff = DSPBLINOFF,
296 .tileoff = DSPBTILEOFF,
297 .palette = PALETTE_B,
298 }
299 };
300
psb_chip_setup(struct drm_device * dev)301 static int psb_chip_setup(struct drm_device *dev)
302 {
303 struct drm_psb_private *dev_priv = dev->dev_private;
304 dev_priv->regmap = psb_regmap;
305 gma_get_core_freq(dev);
306 gma_intel_setup_gmbus(dev);
307 psb_intel_opregion_init(dev);
308 psb_intel_init_bios(dev);
309 return 0;
310 }
311
psb_chip_teardown(struct drm_device * dev)312 static void psb_chip_teardown(struct drm_device *dev)
313 {
314 struct drm_psb_private *dev_priv = dev->dev_private;
315 psb_lid_timer_takedown(dev_priv);
316 gma_intel_teardown_gmbus(dev);
317 }
318
319 const struct psb_ops psb_chip_ops = {
320 .name = "Poulsbo",
321 .accel_2d = 1,
322 .pipes = 2,
323 .crtcs = 2,
324 .hdmi_mask = (1 << 0),
325 .lvds_mask = (1 << 1),
326 .sdvo_mask = (1 << 0),
327 .cursor_needs_phys = 1,
328 .sgx_offset = PSB_SGX_OFFSET,
329 .chip_setup = psb_chip_setup,
330 .chip_teardown = psb_chip_teardown,
331
332 .crtc_helper = &psb_intel_helper_funcs,
333 .crtc_funcs = &psb_intel_crtc_funcs,
334 .clock_funcs = &psb_clock_funcs,
335
336 .output_init = psb_output_init,
337
338 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
339 .backlight_init = psb_backlight_init,
340 #endif
341
342 .init_pm = psb_init_pm,
343 .save_regs = psb_save_display_registers,
344 .restore_regs = psb_restore_display_registers,
345 .save_crtc = gma_crtc_save,
346 .restore_crtc = gma_crtc_restore,
347 .power_down = psb_power_down,
348 .power_up = psb_power_up,
349 };
350
351
