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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
44struct 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 */
56struct 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 */
78struct opregion_swsci {
79 /*FIXME: add it later*/
80} __packed;
81
82/* OpRegion mailbox #3: ASLE */
83struct 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
146static struct psb_intel_opregion *system_opregion;
147
148static 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
173static 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
199void 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
212void 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
234static 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
255static struct notifier_block psb_intel_opregion_notifier = {
256 .notifier_call = psb_intel_opregion_video_event,
257};
258
259void 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
279void 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
305int 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
350err_out:
351 iounmap(base);
352 return err;
353}
354