2 * Copyright 2008 Intel Corporation <hong.liu@intel.com>
3 * Copyright 2008 Red Hat <mjg@redhat.com>
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sub license, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial
15 * portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NON-INFRINGEMENT. IN NO EVENT SHALL INTEL AND/OR ITS SUPPLIERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
22 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
28 #include <linux/acpi.h>
38 #define OPREGION_SZ (8*1024)
39 #define OPREGION_HEADER_OFFSET 0
40 #define OPREGION_ACPI_OFFSET 0x100
41 #define OPREGION_SWSCI_OFFSET 0x200
42 #define OPREGION_ASLE_OFFSET 0x300
43 #define OPREGION_VBT_OFFSET 0x1000
45 #define OPREGION_SIGNATURE "IntelGraphicsMem"
46 #define MBOX_ACPI (1<<0)
47 #define MBOX_SWSCI (1<<1)
48 #define MBOX_ASLE (1<<2)
50 struct opregion_header {
59 } __attribute__((packed));
61 /* OpRegion mailbox #1: public ACPI methods */
62 struct opregion_acpi {
63 u32 drdy; /* driver readiness */
64 u32 csts; /* notification status */
65 u32 cevt; /* current event */
67 u32 didl[8]; /* supported display devices ID list */
68 u32 cpdl[8]; /* currently presented display list */
69 u32 cadl[8]; /* currently active display list */
70 u32 nadl[8]; /* next active devices list */
71 u32 aslp; /* ASL sleep time-out */
72 u32 tidx; /* toggle table index */
73 u32 chpd; /* current hotplug enable indicator */
74 u32 clid; /* current lid state*/
75 u32 cdck; /* current docking state */
76 u32 sxsw; /* Sx state resume */
77 u32 evts; /* ASL supported events */
78 u32 cnot; /* current OS notification */
79 u32 nrdy; /* driver status */
81 } __attribute__((packed));
83 /* OpRegion mailbox #2: SWSCI */
84 struct opregion_swsci {
85 u32 scic; /* SWSCI command|status|data */
86 u32 parm; /* command parameters */
87 u32 dslp; /* driver sleep time-out */
89 } __attribute__((packed));
91 /* OpRegion mailbox #3: ASLE */
92 struct opregion_asle {
93 u32 ardy; /* driver readiness */
94 u32 aslc; /* ASLE interrupt command */
95 u32 tche; /* technology enabled indicator */
96 u32 alsi; /* current ALS illuminance reading */
97 u32 bclp; /* backlight brightness to set */
98 u32 pfit; /* panel fitting state */
99 u32 cblv; /* current brightness level */
100 u16 bclm[20]; /* backlight level duty cycle mapping table */
101 u32 cpfm; /* current panel fitting mode */
102 u32 epfm; /* enabled panel fitting modes */
103 u8 plut[74]; /* panel LUT and identifier */
104 u32 pfmb; /* PWM freq and min brightness */
106 } __attribute__((packed));
108 /* ASLE irq request bits */
109 #define ASLE_SET_ALS_ILLUM (1 << 0)
110 #define ASLE_SET_BACKLIGHT (1 << 1)
111 #define ASLE_SET_PFIT (1 << 2)
112 #define ASLE_SET_PWM_FREQ (1 << 3)
113 #define ASLE_REQ_MSK 0xf
115 /* response bits of ASLE irq request */
116 #define ASLE_ALS_ILLUM_FAIL (2<<10)
117 #define ASLE_BACKLIGHT_FAIL (2<<12)
118 #define ASLE_PFIT_FAIL (2<<14)
119 #define ASLE_PWM_FREQ_FAIL (2<<16)
121 /* ASLE backlight brightness to set */
122 #define ASLE_BCLP_VALID (1<<31)
123 #define ASLE_BCLP_MSK (~(1<<31))
125 /* ASLE panel fitting request */
126 #define ASLE_PFIT_VALID (1<<31)
127 #define ASLE_PFIT_CENTER (1<<0)
128 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
129 #define ASLE_PFIT_STRETCH_GFX (1<<2)
131 /* PWM frequency and minimum brightness */
132 #define ASLE_PFMB_BRIGHTNESS_MASK (0xff)
133 #define ASLE_PFMB_BRIGHTNESS_VALID (1<<8)
134 #define ASLE_PFMB_PWM_MASK (0x7ffffe00)
135 #define ASLE_PFMB_PWM_VALID (1<<31)
137 #define ASLE_CBLV_VALID (1<<31)
139 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
141 struct drm_i915_private *dev_priv = dev->dev_private;
142 struct opregion_asle *asle = dev_priv->opregion.asle;
143 u32 blc_pwm_ctl, blc_pwm_ctl2;
145 if (!(bclp & ASLE_BCLP_VALID))
146 return ASLE_BACKLIGHT_FAIL;
148 bclp &= ASLE_BCLP_MSK;
149 if (bclp < 0 || bclp > 255)
150 return ASLE_BACKLIGHT_FAIL;
152 blc_pwm_ctl = I915_READ(BLC_PWM_CTL);
153 blc_pwm_ctl &= ~BACKLIGHT_DUTY_CYCLE_MASK;
154 blc_pwm_ctl2 = I915_READ(BLC_PWM_CTL2);
156 if (blc_pwm_ctl2 & BLM_COMBINATION_MODE)
157 pci_write_config_dword(dev->pdev, PCI_LBPC, bclp);
159 I915_WRITE(BLC_PWM_CTL, blc_pwm_ctl | ((bclp * 0x101)-1));
161 asle->cblv = (bclp*0x64)/0xff | ASLE_CBLV_VALID;
166 static u32 asle_set_als_illum(struct drm_device *dev, u32 alsi)
168 /* alsi is the current ALS reading in lux. 0 indicates below sensor
169 range, 0xffff indicates above sensor range. 1-0xfffe are valid */
173 static u32 asle_set_pwm_freq(struct drm_device *dev, u32 pfmb)
175 struct drm_i915_private *dev_priv = dev->dev_private;
176 if (pfmb & ASLE_PFMB_PWM_VALID) {
177 u32 blc_pwm_ctl = I915_READ(BLC_PWM_CTL);
178 u32 pwm = pfmb & ASLE_PFMB_PWM_MASK;
179 blc_pwm_ctl &= BACKLIGHT_DUTY_CYCLE_MASK;
181 /* FIXME - what do we do with the PWM? */
186 static u32 asle_set_pfit(struct drm_device *dev, u32 pfit)
188 /* Panel fitting is currently controlled by the X code, so this is a
189 noop until modesetting support works fully */
190 if (!(pfit & ASLE_PFIT_VALID))
191 return ASLE_PFIT_FAIL;
195 void opregion_asle_intr(struct drm_device *dev)
197 struct drm_i915_private *dev_priv = dev->dev_private;
198 struct opregion_asle *asle = dev_priv->opregion.asle;
205 asle_req = asle->aslc & ASLE_REQ_MSK;
208 DRM_DEBUG("non asle set request??\n");
212 if (asle_req & ASLE_SET_ALS_ILLUM)
213 asle_stat |= asle_set_als_illum(dev, asle->alsi);
215 if (asle_req & ASLE_SET_BACKLIGHT)
216 asle_stat |= asle_set_backlight(dev, asle->bclp);
218 if (asle_req & ASLE_SET_PFIT)
219 asle_stat |= asle_set_pfit(dev, asle->pfit);
221 if (asle_req & ASLE_SET_PWM_FREQ)
222 asle_stat |= asle_set_pwm_freq(dev, asle->pfmb);
224 asle->aslc = asle_stat;
227 #define ASLE_ALS_EN (1<<0)
228 #define ASLE_BLC_EN (1<<1)
229 #define ASLE_PFIT_EN (1<<2)
230 #define ASLE_PFMB_EN (1<<3)
232 void opregion_enable_asle(struct drm_device *dev)
234 struct drm_i915_private *dev_priv = dev->dev_private;
235 struct opregion_asle *asle = dev_priv->opregion.asle;
238 u32 pipeb_stats = I915_READ(PIPEBSTAT);
239 if (IS_MOBILE(dev)) {
240 /* Many devices trigger events with a write to the
241 legacy backlight controller, so we need to ensure
242 that it's able to generate interrupts */
243 I915_WRITE(PIPEBSTAT, pipeb_stats |=
244 I915_LEGACY_BLC_EVENT_ENABLE);
245 i915_enable_irq(dev_priv, I915_ASLE_INTERRUPT |
246 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT);
248 i915_enable_irq(dev_priv, I915_ASLE_INTERRUPT);
250 asle->tche = ASLE_ALS_EN | ASLE_BLC_EN | ASLE_PFIT_EN |
256 #define ACPI_EV_DISPLAY_SWITCH (1<<0)
257 #define ACPI_EV_LID (1<<1)
258 #define ACPI_EV_DOCK (1<<2)
260 static struct intel_opregion *system_opregion;
262 int intel_opregion_video_event(struct notifier_block *nb, unsigned long val,
265 /* The only video events relevant to opregion are 0x80. These indicate
266 either a docking event, lid switch or display switch request. In
267 Linux, these are handled by the dock, button and video drivers.
268 We might want to fix the video driver to be opregion-aware in
269 future, but right now we just indicate to the firmware that the
270 request has been handled */
272 struct opregion_acpi *acpi;
274 if (!system_opregion)
277 acpi = system_opregion->acpi;
283 static struct notifier_block intel_opregion_notifier = {
284 .notifier_call = intel_opregion_video_event,
287 int intel_opregion_init(struct drm_device *dev)
289 struct drm_i915_private *dev_priv = dev->dev_private;
290 struct intel_opregion *opregion = &dev_priv->opregion;
295 pci_read_config_dword(dev->pdev, PCI_ASLS, &asls);
296 DRM_DEBUG("graphic opregion physical addr: 0x%x\n", asls);
298 DRM_DEBUG("ACPI OpRegion not supported!\n");
302 base = ioremap(asls, OPREGION_SZ);
306 opregion->header = base;
307 if (memcmp(opregion->header->signature, OPREGION_SIGNATURE, 16)) {
308 DRM_DEBUG("opregion signature mismatch\n");
313 mboxes = opregion->header->mboxes;
314 if (mboxes & MBOX_ACPI) {
315 DRM_DEBUG("Public ACPI methods supported\n");
316 opregion->acpi = base + OPREGION_ACPI_OFFSET;
318 DRM_DEBUG("Public ACPI methods not supported\n");
322 opregion->enabled = 1;
324 if (mboxes & MBOX_SWSCI) {
325 DRM_DEBUG("SWSCI supported\n");
326 opregion->swsci = base + OPREGION_SWSCI_OFFSET;
328 if (mboxes & MBOX_ASLE) {
329 DRM_DEBUG("ASLE supported\n");
330 opregion->asle = base + OPREGION_ASLE_OFFSET;
333 /* Notify BIOS we are ready to handle ACPI video ext notifs.
334 * Right now, all the events are handled by the ACPI video module.
335 * We don't actually need to do anything with them. */
336 opregion->acpi->csts = 0;
337 opregion->acpi->drdy = 1;
339 system_opregion = opregion;
340 register_acpi_notifier(&intel_opregion_notifier);
345 iounmap(opregion->header);
346 opregion->header = NULL;
350 void intel_opregion_free(struct drm_device *dev)
352 struct drm_i915_private *dev_priv = dev->dev_private;
353 struct intel_opregion *opregion = &dev_priv->opregion;
355 if (!opregion->enabled)
358 opregion->acpi->drdy = 0;
360 system_opregion = NULL;
361 unregister_acpi_notifier(&intel_opregion_notifier);
363 /* just clear all opregion memory pointers now */
364 iounmap(opregion->header);
365 opregion->header = NULL;
366 opregion->acpi = NULL;
367 opregion->swsci = NULL;
368 opregion->asle = NULL;
370 opregion->enabled = 0;