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 
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 
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 
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 
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 
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 
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  */
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  */
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 
239 static int psb_power_down(struct drm_device *dev)
240 {
241 	return 0;
242 }
243 
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 
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 
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