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1 /*
2  * Copyright 2011 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  *
23  */
24 #include <linux/acpi.h>
25 #include "psb_drv.h"
26 #include "psb_intel_reg.h"
27 
28 #define PCI_ASLE 0xe4
29 #define PCI_ASLS 0xfc
30 
31 #define OPREGION_HEADER_OFFSET 0
32 #define OPREGION_ACPI_OFFSET   0x100
33 #define   ACPI_CLID 0x01ac /* current lid state indicator */
34 #define   ACPI_CDCK 0x01b0 /* current docking state indicator */
35 #define OPREGION_SWSCI_OFFSET  0x200
36 #define OPREGION_ASLE_OFFSET   0x300
37 #define OPREGION_VBT_OFFSET    0x400
38 
39 #define OPREGION_SIGNATURE "IntelGraphicsMem"
40 #define MBOX_ACPI      (1<<0)
41 #define MBOX_SWSCI     (1<<1)
42 #define MBOX_ASLE      (1<<2)
43 
44 struct opregion_header {
45 	u8 signature[16];
46 	u32 size;
47 	u32 opregion_ver;
48 	u8 bios_ver[32];
49 	u8 vbios_ver[16];
50 	u8 driver_ver[16];
51 	u32 mboxes;
52 	u8 reserved[164];
53 } __packed;
54 
55 /* OpRegion mailbox #1: public ACPI methods */
56 struct opregion_acpi {
57 	u32 drdy;	/* driver readiness */
58 	u32 csts;	/* notification status */
59 	u32 cevt;	/* current event */
60 	u8 rsvd1[20];
61 	u32 didl[8];	/* supported display devices ID list */
62 	u32 cpdl[8];	/* currently presented display list */
63 	u32 cadl[8];	/* currently active display list */
64 	u32 nadl[8];	/* next active devices list */
65 	u32 aslp;	/* ASL sleep time-out */
66 	u32 tidx;	/* toggle table index */
67 	u32 chpd;	/* current hotplug enable indicator */
68 	u32 clid;	/* current lid state*/
69 	u32 cdck;	/* current docking state */
70 	u32 sxsw;	/* Sx state resume */
71 	u32 evts;	/* ASL supported events */
72 	u32 cnot;	/* current OS notification */
73 	u32 nrdy;	/* driver status */
74 	u8 rsvd2[60];
75 } __packed;
76 
77 /* OpRegion mailbox #2: SWSCI */
78 struct opregion_swsci {
79 	/*FIXME: add it later*/
80 } __packed;
81 
82 /* OpRegion mailbox #3: ASLE */
83 struct opregion_asle {
84 	u32 ardy;	/* driver readiness */
85 	u32 aslc;	/* ASLE interrupt command */
86 	u32 tche;	/* technology enabled indicator */
87 	u32 alsi;	/* current ALS illuminance reading */
88 	u32 bclp;	/* backlight brightness to set */
89 	u32 pfit;	/* panel fitting state */
90 	u32 cblv;	/* current brightness level */
91 	u16 bclm[20];	/* backlight level duty cycle mapping table */
92 	u32 cpfm;	/* current panel fitting mode */
93 	u32 epfm;	/* enabled panel fitting modes */
94 	u8 plut[74];	/* panel LUT and identifier */
95 	u32 pfmb;	/* PWM freq and min brightness */
96 	u8 rsvd[102];
97 } __packed;
98 
99 /* ASLE irq request bits */
100 #define ASLE_SET_ALS_ILLUM     (1 << 0)
101 #define ASLE_SET_BACKLIGHT     (1 << 1)
102 #define ASLE_SET_PFIT          (1 << 2)
103 #define ASLE_SET_PWM_FREQ      (1 << 3)
104 #define ASLE_REQ_MSK           0xf
105 
106 /* response bits of ASLE irq request */
107 #define ASLE_ALS_ILLUM_FAILED   (1<<10)
108 #define ASLE_BACKLIGHT_FAILED   (1<<12)
109 #define ASLE_PFIT_FAILED        (1<<14)
110 #define ASLE_PWM_FREQ_FAILED    (1<<16)
111 
112 /* ASLE backlight brightness to set */
113 #define ASLE_BCLP_VALID                (1<<31)
114 #define ASLE_BCLP_MSK          (~(1<<31))
115 
116 /* ASLE panel fitting request */
117 #define ASLE_PFIT_VALID         (1<<31)
118 #define ASLE_PFIT_CENTER (1<<0)
119 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
120 #define ASLE_PFIT_STRETCH_GFX (1<<2)
121 
122 /* response bits of ASLE irq request */
123 #define ASLE_ALS_ILLUM_FAILED	(1<<10)
124 #define ASLE_BACKLIGHT_FAILED	(1<<12)
125 #define ASLE_PFIT_FAILED	(1<<14)
126 #define ASLE_PWM_FREQ_FAILED	(1<<16)
127 
128 /* ASLE backlight brightness to set */
129 #define ASLE_BCLP_VALID                (1<<31)
130 #define ASLE_BCLP_MSK          (~(1<<31))
131 
132 /* ASLE panel fitting request */
133 #define ASLE_PFIT_VALID         (1<<31)
134 #define ASLE_PFIT_CENTER (1<<0)
135 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
136 #define ASLE_PFIT_STRETCH_GFX (1<<2)
137 
138 /* PWM frequency and minimum brightness */
139 #define ASLE_PFMB_BRIGHTNESS_MASK (0xff)
140 #define ASLE_PFMB_BRIGHTNESS_VALID (1<<8)
141 #define ASLE_PFMB_PWM_MASK (0x7ffffe00)
142 #define ASLE_PFMB_PWM_VALID (1<<31)
143 
144 #define ASLE_CBLV_VALID         (1<<31)
145 
146 static struct psb_intel_opregion *system_opregion;
147 
asle_set_backlight(struct drm_device * dev,u32 bclp)148 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
149 {
150 	struct drm_psb_private *dev_priv = dev->dev_private;
151 	struct opregion_asle *asle = dev_priv->opregion.asle;
152 	struct backlight_device *bd = dev_priv->backlight_device;
153 
154 	DRM_DEBUG_DRIVER("asle set backlight %x\n", bclp);
155 
156 	if (!(bclp & ASLE_BCLP_VALID))
157 		return ASLE_BACKLIGHT_FAILED;
158 
159 	if (bd == NULL)
160 		return ASLE_BACKLIGHT_FAILED;
161 
162 	bclp &= ASLE_BCLP_MSK;
163 	if (bclp > 255)
164 		return ASLE_BACKLIGHT_FAILED;
165 
166 	gma_backlight_set(dev, bclp * bd->props.max_brightness / 255);
167 
168 	asle->cblv = (bclp * 0x64) / 0xff | ASLE_CBLV_VALID;
169 
170 	return 0;
171 }
172 
psb_intel_opregion_asle_work(struct work_struct * work)173 static void psb_intel_opregion_asle_work(struct work_struct *work)
174 {
175 	struct psb_intel_opregion *opregion =
176 		container_of(work, struct psb_intel_opregion, asle_work);
177 	struct drm_psb_private *dev_priv =
178 		container_of(opregion, struct drm_psb_private, opregion);
179 	struct opregion_asle *asle = opregion->asle;
180 	u32 asle_stat = 0;
181 	u32 asle_req;
182 
183 	if (!asle)
184 		return;
185 
186 	asle_req = asle->aslc & ASLE_REQ_MSK;
187 	if (!asle_req) {
188 		DRM_DEBUG_DRIVER("non asle set request??\n");
189 		return;
190 	}
191 
192 	if (asle_req & ASLE_SET_BACKLIGHT)
193 		asle_stat |= asle_set_backlight(dev_priv->dev, asle->bclp);
194 
195 	asle->aslc = asle_stat;
196 
197 }
198 
psb_intel_opregion_asle_intr(struct drm_device * dev)199 void psb_intel_opregion_asle_intr(struct drm_device *dev)
200 {
201 	struct drm_psb_private *dev_priv = dev->dev_private;
202 
203 	if (dev_priv->opregion.asle)
204 		schedule_work(&dev_priv->opregion.asle_work);
205 }
206 
207 #define ASLE_ALS_EN    (1<<0)
208 #define ASLE_BLC_EN    (1<<1)
209 #define ASLE_PFIT_EN   (1<<2)
210 #define ASLE_PFMB_EN   (1<<3)
211 
psb_intel_opregion_enable_asle(struct drm_device * dev)212 void psb_intel_opregion_enable_asle(struct drm_device *dev)
213 {
214 	struct drm_psb_private *dev_priv = dev->dev_private;
215 	struct opregion_asle *asle = dev_priv->opregion.asle;
216 
217 	if (asle && system_opregion ) {
218 		/* Don't do this on Medfield or other non PC like devices, they
219 		   use the bit for something different altogether */
220 		psb_enable_pipestat(dev_priv, 0, PIPE_LEGACY_BLC_EVENT_ENABLE);
221 		psb_enable_pipestat(dev_priv, 1, PIPE_LEGACY_BLC_EVENT_ENABLE);
222 
223 		asle->tche = ASLE_ALS_EN | ASLE_BLC_EN | ASLE_PFIT_EN
224 								| ASLE_PFMB_EN;
225 		asle->ardy = 1;
226 	}
227 }
228 
229 #define ACPI_EV_DISPLAY_SWITCH (1<<0)
230 #define ACPI_EV_LID            (1<<1)
231 #define ACPI_EV_DOCK           (1<<2)
232 
233 
psb_intel_opregion_video_event(struct notifier_block * nb,unsigned long val,void * data)234 static int psb_intel_opregion_video_event(struct notifier_block *nb,
235 					  unsigned long val, void *data)
236 {
237 	/* The only video events relevant to opregion are 0x80. These indicate
238 	   either a docking event, lid switch or display switch request. In
239 	   Linux, these are handled by the dock, button and video drivers.
240 	   We might want to fix the video driver to be opregion-aware in
241 	   future, but right now we just indicate to the firmware that the
242 	   request has been handled */
243 
244 	struct opregion_acpi *acpi;
245 
246 	if (!system_opregion)
247 		return NOTIFY_DONE;
248 
249 	acpi = system_opregion->acpi;
250 	acpi->csts = 0;
251 
252 	return NOTIFY_OK;
253 }
254 
255 static struct notifier_block psb_intel_opregion_notifier = {
256 	.notifier_call = psb_intel_opregion_video_event,
257 };
258 
psb_intel_opregion_init(struct drm_device * dev)259 void psb_intel_opregion_init(struct drm_device *dev)
260 {
261 	struct drm_psb_private *dev_priv = dev->dev_private;
262 	struct psb_intel_opregion *opregion = &dev_priv->opregion;
263 
264 	if (!opregion->header)
265 		return;
266 
267 	if (opregion->acpi) {
268 		/* Notify BIOS we are ready to handle ACPI video ext notifs.
269 		 * Right now, all the events are handled by the ACPI video
270 		 * module. We don't actually need to do anything with them. */
271 		opregion->acpi->csts = 0;
272 		opregion->acpi->drdy = 1;
273 
274 		system_opregion = opregion;
275 		register_acpi_notifier(&psb_intel_opregion_notifier);
276 	}
277 }
278 
psb_intel_opregion_fini(struct drm_device * dev)279 void psb_intel_opregion_fini(struct drm_device *dev)
280 {
281 	struct drm_psb_private *dev_priv = dev->dev_private;
282 	struct psb_intel_opregion *opregion = &dev_priv->opregion;
283 
284 	if (!opregion->header)
285 		return;
286 
287 	if (opregion->acpi) {
288 		opregion->acpi->drdy = 0;
289 
290 		system_opregion = NULL;
291 		unregister_acpi_notifier(&psb_intel_opregion_notifier);
292 	}
293 
294 	cancel_work_sync(&opregion->asle_work);
295 
296 	/* just clear all opregion memory pointers now */
297 	iounmap(opregion->header);
298 	opregion->header = NULL;
299 	opregion->acpi = NULL;
300 	opregion->swsci = NULL;
301 	opregion->asle = NULL;
302 	opregion->vbt = NULL;
303 }
304 
psb_intel_opregion_setup(struct drm_device * dev)305 int psb_intel_opregion_setup(struct drm_device *dev)
306 {
307 	struct drm_psb_private *dev_priv = dev->dev_private;
308 	struct psb_intel_opregion *opregion = &dev_priv->opregion;
309 	u32 opregion_phy, mboxes;
310 	void __iomem *base;
311 	int err = 0;
312 
313 	pci_read_config_dword(dev->pdev, PCI_ASLS, &opregion_phy);
314 	if (opregion_phy == 0) {
315 		DRM_DEBUG_DRIVER("ACPI Opregion not supported\n");
316 		return -ENOTSUPP;
317 	}
318 
319 	INIT_WORK(&opregion->asle_work, psb_intel_opregion_asle_work);
320 
321 	DRM_DEBUG("OpRegion detected at 0x%8x\n", opregion_phy);
322 	base = acpi_os_ioremap(opregion_phy, 8*1024);
323 	if (!base)
324 		return -ENOMEM;
325 
326 	if (memcmp(base, OPREGION_SIGNATURE, 16)) {
327 		DRM_DEBUG_DRIVER("opregion signature mismatch\n");
328 		err = -EINVAL;
329 		goto err_out;
330 	}
331 
332 	opregion->header = base;
333 	opregion->vbt = base + OPREGION_VBT_OFFSET;
334 
335 	opregion->lid_state = base + ACPI_CLID;
336 
337 	mboxes = opregion->header->mboxes;
338 	if (mboxes & MBOX_ACPI) {
339 		DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
340 		opregion->acpi = base + OPREGION_ACPI_OFFSET;
341 	}
342 
343 	if (mboxes & MBOX_ASLE) {
344 		DRM_DEBUG_DRIVER("ASLE supported\n");
345 		opregion->asle = base + OPREGION_ASLE_OFFSET;
346 	}
347 
348 	return 0;
349 
350 err_out:
351 	iounmap(base);
352 	return err;
353 }
354 
355