xref: /openbmc/linux/drivers/gpu/drm/gma500/opregion.c (revision 1f90b123)
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_irq.h"
27 #include "psb_intel_reg.h"
28 
29 #define PCI_ASLE 0xe4
30 #define PCI_ASLS 0xfc
31 
32 #define OPREGION_HEADER_OFFSET 0
33 #define OPREGION_ACPI_OFFSET   0x100
34 #define   ACPI_CLID 0x01ac /* current lid state indicator */
35 #define   ACPI_CDCK 0x01b0 /* current docking state indicator */
36 #define OPREGION_SWSCI_OFFSET  0x200
37 #define OPREGION_ASLE_OFFSET   0x300
38 #define OPREGION_VBT_OFFSET    0x400
39 
40 #define OPREGION_SIGNATURE "IntelGraphicsMem"
41 #define MBOX_ACPI      (1<<0)
42 #define MBOX_SWSCI     (1<<1)
43 #define MBOX_ASLE      (1<<2)
44 
45 struct opregion_header {
46 	u8 signature[16];
47 	u32 size;
48 	u32 opregion_ver;
49 	u8 bios_ver[32];
50 	u8 vbios_ver[16];
51 	u8 driver_ver[16];
52 	u32 mboxes;
53 	u8 reserved[164];
54 } __packed;
55 
56 /* OpRegion mailbox #1: public ACPI methods */
57 struct opregion_acpi {
58 	u32 drdy;	/* driver readiness */
59 	u32 csts;	/* notification status */
60 	u32 cevt;	/* current event */
61 	u8 rsvd1[20];
62 	u32 didl[8];	/* supported display devices ID list */
63 	u32 cpdl[8];	/* currently presented display list */
64 	u32 cadl[8];	/* currently active display list */
65 	u32 nadl[8];	/* next active devices list */
66 	u32 aslp;	/* ASL sleep time-out */
67 	u32 tidx;	/* toggle table index */
68 	u32 chpd;	/* current hotplug enable indicator */
69 	u32 clid;	/* current lid state*/
70 	u32 cdck;	/* current docking state */
71 	u32 sxsw;	/* Sx state resume */
72 	u32 evts;	/* ASL supported events */
73 	u32 cnot;	/* current OS notification */
74 	u32 nrdy;	/* driver status */
75 	u8 rsvd2[60];
76 } __packed;
77 
78 /* OpRegion mailbox #2: SWSCI */
79 struct opregion_swsci {
80 	/*FIXME: add it later*/
81 } __packed;
82 
83 /* OpRegion mailbox #3: ASLE */
84 struct opregion_asle {
85 	u32 ardy;	/* driver readiness */
86 	u32 aslc;	/* ASLE interrupt command */
87 	u32 tche;	/* technology enabled indicator */
88 	u32 alsi;	/* current ALS illuminance reading */
89 	u32 bclp;	/* backlight brightness to set */
90 	u32 pfit;	/* panel fitting state */
91 	u32 cblv;	/* current brightness level */
92 	u16 bclm[20];	/* backlight level duty cycle mapping table */
93 	u32 cpfm;	/* current panel fitting mode */
94 	u32 epfm;	/* enabled panel fitting modes */
95 	u8 plut[74];	/* panel LUT and identifier */
96 	u32 pfmb;	/* PWM freq and min brightness */
97 	u8 rsvd[102];
98 } __packed;
99 
100 /* ASLE irq request bits */
101 #define ASLE_SET_ALS_ILLUM     (1 << 0)
102 #define ASLE_SET_BACKLIGHT     (1 << 1)
103 #define ASLE_SET_PFIT          (1 << 2)
104 #define ASLE_SET_PWM_FREQ      (1 << 3)
105 #define ASLE_REQ_MSK           0xf
106 
107 /* response bits of ASLE irq request */
108 #define ASLE_ALS_ILLUM_FAILED   (1<<10)
109 #define ASLE_BACKLIGHT_FAILED   (1<<12)
110 #define ASLE_PFIT_FAILED        (1<<14)
111 #define ASLE_PWM_FREQ_FAILED    (1<<16)
112 
113 /* ASLE backlight brightness to set */
114 #define ASLE_BCLP_VALID                (1<<31)
115 #define ASLE_BCLP_MSK          (~(1<<31))
116 
117 /* ASLE panel fitting request */
118 #define ASLE_PFIT_VALID         (1<<31)
119 #define ASLE_PFIT_CENTER (1<<0)
120 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
121 #define ASLE_PFIT_STRETCH_GFX (1<<2)
122 
123 /* response bits of ASLE irq request */
124 #define ASLE_ALS_ILLUM_FAILED	(1<<10)
125 #define ASLE_BACKLIGHT_FAILED	(1<<12)
126 #define ASLE_PFIT_FAILED	(1<<14)
127 #define ASLE_PWM_FREQ_FAILED	(1<<16)
128 
129 /* ASLE backlight brightness to set */
130 #define ASLE_BCLP_VALID                (1<<31)
131 #define ASLE_BCLP_MSK          (~(1<<31))
132 
133 /* ASLE panel fitting request */
134 #define ASLE_PFIT_VALID         (1<<31)
135 #define ASLE_PFIT_CENTER (1<<0)
136 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
137 #define ASLE_PFIT_STRETCH_GFX (1<<2)
138 
139 /* PWM frequency and minimum brightness */
140 #define ASLE_PFMB_BRIGHTNESS_MASK (0xff)
141 #define ASLE_PFMB_BRIGHTNESS_VALID (1<<8)
142 #define ASLE_PFMB_PWM_MASK (0x7ffffe00)
143 #define ASLE_PFMB_PWM_VALID (1<<31)
144 
145 #define ASLE_CBLV_VALID         (1<<31)
146 
147 static struct psb_intel_opregion *system_opregion;
148 
asle_set_backlight(struct drm_device * dev,u32 bclp)149 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
150 {
151 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
152 	struct opregion_asle *asle = dev_priv->opregion.asle;
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 	bclp &= ASLE_BCLP_MSK;
160 	if (bclp > 255)
161 		return ASLE_BACKLIGHT_FAILED;
162 
163 	gma_backlight_set(dev, bclp * PSB_MAX_BRIGHTNESS / 255);
164 
165 	asle->cblv = (bclp * 0x64) / 0xff | ASLE_CBLV_VALID;
166 
167 	return 0;
168 }
169 
psb_intel_opregion_asle_work(struct work_struct * work)170 static void psb_intel_opregion_asle_work(struct work_struct *work)
171 {
172 	struct psb_intel_opregion *opregion =
173 		container_of(work, struct psb_intel_opregion, asle_work);
174 	struct drm_psb_private *dev_priv =
175 		container_of(opregion, struct drm_psb_private, opregion);
176 	struct opregion_asle *asle = opregion->asle;
177 	u32 asle_stat = 0;
178 	u32 asle_req;
179 
180 	if (!asle)
181 		return;
182 
183 	asle_req = asle->aslc & ASLE_REQ_MSK;
184 	if (!asle_req) {
185 		DRM_DEBUG_DRIVER("non asle set request??\n");
186 		return;
187 	}
188 
189 	if (asle_req & ASLE_SET_BACKLIGHT)
190 		asle_stat |= asle_set_backlight(&dev_priv->dev, asle->bclp);
191 
192 	asle->aslc = asle_stat;
193 
194 }
195 
psb_intel_opregion_asle_intr(struct drm_device * dev)196 void psb_intel_opregion_asle_intr(struct drm_device *dev)
197 {
198 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
199 
200 	if (dev_priv->opregion.asle)
201 		schedule_work(&dev_priv->opregion.asle_work);
202 }
203 
204 #define ASLE_ALS_EN    (1<<0)
205 #define ASLE_BLC_EN    (1<<1)
206 #define ASLE_PFIT_EN   (1<<2)
207 #define ASLE_PFMB_EN   (1<<3)
208 
psb_intel_opregion_enable_asle(struct drm_device * dev)209 void psb_intel_opregion_enable_asle(struct drm_device *dev)
210 {
211 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
212 	struct opregion_asle *asle = dev_priv->opregion.asle;
213 
214 	if (asle && system_opregion ) {
215 		/* Don't do this on Medfield or other non PC like devices, they
216 		   use the bit for something different altogether */
217 		gma_enable_pipestat(dev_priv, 0, PIPE_LEGACY_BLC_EVENT_ENABLE);
218 		gma_enable_pipestat(dev_priv, 1, PIPE_LEGACY_BLC_EVENT_ENABLE);
219 
220 		asle->tche = ASLE_ALS_EN | ASLE_BLC_EN | ASLE_PFIT_EN
221 								| ASLE_PFMB_EN;
222 		asle->ardy = 1;
223 	}
224 }
225 
226 #define ACPI_EV_DISPLAY_SWITCH (1<<0)
227 #define ACPI_EV_LID            (1<<1)
228 #define ACPI_EV_DOCK           (1<<2)
229 
230 
psb_intel_opregion_video_event(struct notifier_block * nb,unsigned long val,void * data)231 static int psb_intel_opregion_video_event(struct notifier_block *nb,
232 					  unsigned long val, void *data)
233 {
234 	/* The only video events relevant to opregion are 0x80. These indicate
235 	   either a docking event, lid switch or display switch request. In
236 	   Linux, these are handled by the dock, button and video drivers.
237 	   We might want to fix the video driver to be opregion-aware in
238 	   future, but right now we just indicate to the firmware that the
239 	   request has been handled */
240 
241 	struct opregion_acpi *acpi;
242 
243 	if (!system_opregion)
244 		return NOTIFY_DONE;
245 
246 	acpi = system_opregion->acpi;
247 	acpi->csts = 0;
248 
249 	return NOTIFY_OK;
250 }
251 
252 static struct notifier_block psb_intel_opregion_notifier = {
253 	.notifier_call = psb_intel_opregion_video_event,
254 };
255 
psb_intel_opregion_init(struct drm_device * dev)256 void psb_intel_opregion_init(struct drm_device *dev)
257 {
258 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
259 	struct psb_intel_opregion *opregion = &dev_priv->opregion;
260 
261 	if (!opregion->header)
262 		return;
263 
264 	if (opregion->acpi) {
265 		/* Notify BIOS we are ready to handle ACPI video ext notifs.
266 		 * Right now, all the events are handled by the ACPI video
267 		 * module. We don't actually need to do anything with them. */
268 		opregion->acpi->csts = 0;
269 		opregion->acpi->drdy = 1;
270 
271 		system_opregion = opregion;
272 		register_acpi_notifier(&psb_intel_opregion_notifier);
273 	}
274 }
275 
psb_intel_opregion_fini(struct drm_device * dev)276 void psb_intel_opregion_fini(struct drm_device *dev)
277 {
278 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
279 	struct psb_intel_opregion *opregion = &dev_priv->opregion;
280 
281 	if (!opregion->header)
282 		return;
283 
284 	if (opregion->acpi) {
285 		opregion->acpi->drdy = 0;
286 
287 		system_opregion = NULL;
288 		unregister_acpi_notifier(&psb_intel_opregion_notifier);
289 	}
290 
291 	cancel_work_sync(&opregion->asle_work);
292 
293 	/* just clear all opregion memory pointers now */
294 	iounmap(opregion->header);
295 	opregion->header = NULL;
296 	opregion->acpi = NULL;
297 	opregion->swsci = NULL;
298 	opregion->asle = NULL;
299 	opregion->vbt = NULL;
300 }
301 
psb_intel_opregion_setup(struct drm_device * dev)302 int psb_intel_opregion_setup(struct drm_device *dev)
303 {
304 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
305 	struct pci_dev *pdev = to_pci_dev(dev->dev);
306 	struct psb_intel_opregion *opregion = &dev_priv->opregion;
307 	u32 opregion_phy, mboxes;
308 	void __iomem *base;
309 	int err = 0;
310 
311 	pci_read_config_dword(pdev, PCI_ASLS, &opregion_phy);
312 	if (opregion_phy == 0) {
313 		DRM_DEBUG_DRIVER("ACPI Opregion not supported\n");
314 		return -ENOTSUPP;
315 	}
316 
317 	INIT_WORK(&opregion->asle_work, psb_intel_opregion_asle_work);
318 
319 	DRM_DEBUG("OpRegion detected at 0x%8x\n", opregion_phy);
320 	base = acpi_os_ioremap(opregion_phy, 8*1024);
321 	if (!base)
322 		return -ENOMEM;
323 
324 	if (memcmp(base, OPREGION_SIGNATURE, 16)) {
325 		DRM_DEBUG_DRIVER("opregion signature mismatch\n");
326 		err = -EINVAL;
327 		goto err_out;
328 	}
329 
330 	opregion->header = base;
331 	opregion->vbt = base + OPREGION_VBT_OFFSET;
332 
333 	opregion->lid_state = base + ACPI_CLID;
334 
335 	mboxes = opregion->header->mboxes;
336 	if (mboxes & MBOX_ACPI) {
337 		DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
338 		opregion->acpi = base + OPREGION_ACPI_OFFSET;
339 	}
340 
341 	if (mboxes & MBOX_ASLE) {
342 		DRM_DEBUG_DRIVER("ASLE supported\n");
343 		opregion->asle = base + OPREGION_ASLE_OFFSET;
344 	}
345 
346 	return 0;
347 
348 err_out:
349 	iounmap(base);
350 	return err;
351 }
352 
353