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#include "gma_device.h"
30
31static int psb_output_init(struct drm_device *dev)
32{
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);
36	return 0;
37}
38
39#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
40
41/*
42 *	Poulsbo Backlight Interfaces
43 */
44
45#define BLC_PWM_PRECISION_FACTOR 100	/* 10000000 */
46#define BLC_PWM_FREQ_CALC_CONSTANT 32
47#define MHz 1000000
48
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
52
53#define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
54#define PSB_BACKLIGHT_PWM_CTL_SHIFT	(16)
55
56static int psb_brightness;
57static struct backlight_device *psb_backlight_device;
58
59static int psb_get_brightness(struct backlight_device *bd)
60{
61	/* return locally cached var instead of HW read (due to DPST etc.) */
62	/* FIXME: ideally return actual value in case firmware fiddled with
63	   it */
64	return psb_brightness;
65}
66
67
68static int psb_backlight_setup(struct drm_device *dev)
69{
70	struct drm_psb_private *dev_priv = dev->dev_private;
71	unsigned long core_clock;
72	/* u32 bl_max_freq; */
73	/* unsigned long value; */
74	u16 bl_max_freq;
75	uint32_t value;
76	uint32_t blc_pwm_precision_factor;
77
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");
81		return -ENOENT;
82	}
83	bl_max_freq = dev_priv->lvds_bl->freq;
84	blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR;
85
86	core_clock = dev_priv->core_freq;
87
88	value = (core_clock * MHz) / BLC_PWM_FREQ_CALC_CONSTANT;
89	value *= blc_pwm_precision_factor;
90	value /= bl_max_freq;
91	value /= blc_pwm_precision_factor;
92
93	if (value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ ||
94		 value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ)
95				return -ERANGE;
96	else {
97		value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
98		REG_WRITE(BLC_PWM_CTL,
99			(value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | (value));
100	}
101	return 0;
102}
103
104static int psb_set_brightness(struct backlight_device *bd)
105{
106	struct drm_device *dev = bl_get_data(psb_backlight_device);
107	int level = bd->props.brightness;
108
109	/* Percentage 1-100% being valid */
110	if (level < 1)
111		level = 1;
112
113	psb_intel_lvds_set_brightness(dev, level);
114	psb_brightness = level;
115	return 0;
116}
117
118static const struct backlight_ops psb_ops = {
119	.get_brightness = psb_get_brightness,
120	.update_status  = psb_set_brightness,
121};
122
123static int psb_backlight_init(struct drm_device *dev)
124{
125	struct drm_psb_private *dev_priv = dev->dev_private;
126	int ret;
127	struct backlight_properties props;
128
129	memset(&props, 0, sizeof(struct backlight_properties));
130	props.max_brightness = 100;
131	props.type = BACKLIGHT_PLATFORM;
132
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);
137
138	ret = psb_backlight_setup(dev);
139	if (ret < 0) {
140		backlight_device_unregister(psb_backlight_device);
141		psb_backlight_device = NULL;
142		return ret;
143	}
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;
148
149	/* This must occur after the backlight is properly initialised */
150	psb_lid_timer_init(dev_priv);
151
152	return 0;
153}
154
155#endif
156
157/*
158 *	Provide the Poulsbo specific chip logic and low level methods
159 *	for power management
160 */
161
162static void psb_init_pm(struct drm_device *dev)
163{
164	struct drm_psb_private *dev_priv = dev->dev_private;
165
166	u32 gating = PSB_RSGX32(PSB_CR_CLKGATECTL);
167	gating &= ~3;	/* Disable 2D clock gating */
168	gating |= 1;
169	PSB_WSGX32(gating, PSB_CR_CLKGATECTL);
170	PSB_RSGX32(PSB_CR_CLKGATECTL);
171}
172
173/**
174 *	psb_save_display_registers	-	save registers lost on suspend
175 *	@dev: our DRM device
176 *
177 *	Save the state we need in order to be able to restore the interface
178 *	upon resume from suspend
179 */
180static int psb_save_display_registers(struct drm_device *dev)
181{
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;
186
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);
196
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);
202	}
203
204	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
205		if (connector->funcs->save)
206			connector->funcs->save(connector);
207
208	drm_modeset_unlock_all(dev);
209	return 0;
210}
211
212/**
213 *	psb_restore_display_registers	-	restore lost register state
214 *	@dev: our DRM device
215 *
216 *	Restore register state that was lost during suspend and resume.
217 */
218static int psb_restore_display_registers(struct drm_device *dev)
219{
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;
224
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);
234
235	/*make sure VGA plane is off. it initializes to on after reset!*/
236	PSB_WVDC32(0x80000000, VGACNTRL);
237
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);
242
243	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
244		if (connector->funcs->restore)
245			connector->funcs->restore(connector);
246
247	drm_modeset_unlock_all(dev);
248	return 0;
249}
250
251static int psb_power_down(struct drm_device *dev)
252{
253	return 0;
254}
255
256static int psb_power_up(struct drm_device *dev)
257{
258	return 0;
259}
260
261/* Poulsbo */
262static const struct psb_offset psb_regmap[2] = {
263	{
264		.fp0 = FPA0,
265		.fp1 = FPA1,
266		.cntr = DSPACNTR,
267		.conf = PIPEACONF,
268		.src = PIPEASRC,
269		.dpll = DPLL_A,
270		.htotal = HTOTAL_A,
271		.hblank = HBLANK_A,
272		.hsync = HSYNC_A,
273		.vtotal = VTOTAL_A,
274		.vblank = VBLANK_A,
275		.vsync = VSYNC_A,
276		.stride = DSPASTRIDE,
277		.size = DSPASIZE,
278		.pos = DSPAPOS,
279		.base = DSPABASE,
280		.surf = DSPASURF,
281		.addr = DSPABASE,
282		.status = PIPEASTAT,
283		.linoff = DSPALINOFF,
284		.tileoff = DSPATILEOFF,
285		.palette = PALETTE_A,
286	},
287	{
288		.fp0 = FPB0,
289		.fp1 = FPB1,
290		.cntr = DSPBCNTR,
291		.conf = PIPEBCONF,
292		.src = PIPEBSRC,
293		.dpll = DPLL_B,
294		.htotal = HTOTAL_B,
295		.hblank = HBLANK_B,
296		.hsync = HSYNC_B,
297		.vtotal = VTOTAL_B,
298		.vblank = VBLANK_B,
299		.vsync = VSYNC_B,
300		.stride = DSPBSTRIDE,
301		.size = DSPBSIZE,
302		.pos = DSPBPOS,
303		.base = DSPBBASE,
304		.surf = DSPBSURF,
305		.addr = DSPBBASE,
306		.status = PIPEBSTAT,
307		.linoff = DSPBLINOFF,
308		.tileoff = DSPBTILEOFF,
309		.palette = PALETTE_B,
310	}
311};
312
313static int psb_chip_setup(struct drm_device *dev)
314{
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);
321	return 0;
322}
323
324static void psb_chip_teardown(struct drm_device *dev)
325{
326	struct drm_psb_private *dev_priv = dev->dev_private;
327	psb_lid_timer_takedown(dev_priv);
328	gma_intel_teardown_gmbus(dev);
329}
330
331const struct psb_ops psb_chip_ops = {
332	.name = "Poulsbo",
333	.accel_2d = 1,
334	.pipes = 2,
335	.crtcs = 2,
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,
343
344	.crtc_helper = &psb_intel_helper_funcs,
345	.crtc_funcs = &psb_intel_crtc_funcs,
346	.clock_funcs = &psb_clock_funcs,
347
348	.output_init = psb_output_init,
349
350#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
351	.backlight_init = psb_backlight_init,
352#endif
353
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,
359};
360
361