1 /* 2 * Copyright © 2016 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 DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> 25 * Jerome Anand <jerome.anand@intel.com> 26 * based on VED patches 27 * 28 */ 29 30 /** 31 * DOC: LPE Audio integration for HDMI or DP playback 32 * 33 * Motivation: 34 * Atom platforms (e.g. valleyview and cherryTrail) integrates a DMA-based 35 * interface as an alternative to the traditional HDaudio path. While this 36 * mode is unrelated to the LPE aka SST audio engine, the documentation refers 37 * to this mode as LPE so we keep this notation for the sake of consistency. 38 * 39 * The interface is handled by a separate standalone driver maintained in the 40 * ALSA subsystem for simplicity. To minimize the interaction between the two 41 * subsystems, a bridge is setup between the hdmi-lpe-audio and i915: 42 * 1. Create a platform device to share MMIO/IRQ resources 43 * 2. Make the platform device child of i915 device for runtime PM. 44 * 3. Create IRQ chip to forward the LPE audio irqs. 45 * the hdmi-lpe-audio driver probes the lpe audio device and creates a new 46 * sound card 47 * 48 * Threats: 49 * Due to the restriction in Linux platform device model, user need manually 50 * uninstall the hdmi-lpe-audio driver before uninstalling i915 module, 51 * otherwise we might run into use-after-free issues after i915 removes the 52 * platform device: even though hdmi-lpe-audio driver is released, the modules 53 * is still in "installed" status. 54 * 55 * Implementation: 56 * The MMIO/REG platform resources are created according to the registers 57 * specification. 58 * When forwarding LPE audio irqs, the flow control handler selection depends 59 * on the platform, for example on valleyview handle_simple_irq is enough. 60 * 61 */ 62 63 #include <linux/acpi.h> 64 #include <linux/delay.h> 65 #include <linux/device.h> 66 #include <linux/irq.h> 67 #include <linux/pci.h> 68 #include <linux/platform_device.h> 69 #include <linux/pm_runtime.h> 70 71 #include <drm/intel_lpe_audio.h> 72 73 #include "i915_drv.h" 74 #include "i915_irq.h" 75 #include "i915_reg.h" 76 #include "intel_de.h" 77 #include "intel_lpe_audio.h" 78 #include "intel_pci_config.h" 79 80 #define HAS_LPE_AUDIO(dev_priv) ((dev_priv)->display.audio.lpe.platdev != NULL) 81 82 static struct platform_device * 83 lpe_audio_platdev_create(struct drm_i915_private *dev_priv) 84 { 85 struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev); 86 struct platform_device_info pinfo = {}; 87 struct resource *rsc; 88 struct platform_device *platdev; 89 struct intel_hdmi_lpe_audio_pdata *pdata; 90 91 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); 92 if (!pdata) 93 return ERR_PTR(-ENOMEM); 94 95 rsc = kcalloc(2, sizeof(*rsc), GFP_KERNEL); 96 if (!rsc) { 97 kfree(pdata); 98 return ERR_PTR(-ENOMEM); 99 } 100 101 rsc[0].start = rsc[0].end = dev_priv->display.audio.lpe.irq; 102 rsc[0].flags = IORESOURCE_IRQ; 103 rsc[0].name = "hdmi-lpe-audio-irq"; 104 105 rsc[1].start = pci_resource_start(pdev, GEN4_GTTMMADR_BAR) + 106 I915_HDMI_LPE_AUDIO_BASE; 107 rsc[1].end = pci_resource_start(pdev, GEN4_GTTMMADR_BAR) + 108 I915_HDMI_LPE_AUDIO_BASE + I915_HDMI_LPE_AUDIO_SIZE - 1; 109 rsc[1].flags = IORESOURCE_MEM; 110 rsc[1].name = "hdmi-lpe-audio-mmio"; 111 112 pinfo.parent = dev_priv->drm.dev; 113 pinfo.name = "hdmi-lpe-audio"; 114 pinfo.id = -1; 115 pinfo.res = rsc; 116 pinfo.num_res = 2; 117 pinfo.data = pdata; 118 pinfo.size_data = sizeof(*pdata); 119 pinfo.dma_mask = DMA_BIT_MASK(32); 120 121 pdata->num_pipes = INTEL_NUM_PIPES(dev_priv); 122 pdata->num_ports = IS_CHERRYVIEW(dev_priv) ? 3 : 2; /* B,C,D or B,C */ 123 pdata->port[0].pipe = -1; 124 pdata->port[1].pipe = -1; 125 pdata->port[2].pipe = -1; 126 spin_lock_init(&pdata->lpe_audio_slock); 127 128 platdev = platform_device_register_full(&pinfo); 129 kfree(rsc); 130 kfree(pdata); 131 132 if (IS_ERR(platdev)) { 133 drm_err(&dev_priv->drm, 134 "Failed to allocate LPE audio platform device\n"); 135 return platdev; 136 } 137 138 pm_runtime_no_callbacks(&platdev->dev); 139 140 return platdev; 141 } 142 143 static void lpe_audio_platdev_destroy(struct drm_i915_private *dev_priv) 144 { 145 /* XXX Note that platform_device_register_full() allocates a dma_mask 146 * and never frees it. We can't free it here as we cannot guarantee 147 * this is the last reference (i.e. that the dma_mask will not be 148 * used after our unregister). So ee choose to leak the sizeof(u64) 149 * allocation here - it should be fixed in the platform_device rather 150 * than us fiddle with its internals. 151 */ 152 153 platform_device_unregister(dev_priv->display.audio.lpe.platdev); 154 } 155 156 static void lpe_audio_irq_unmask(struct irq_data *d) 157 { 158 } 159 160 static void lpe_audio_irq_mask(struct irq_data *d) 161 { 162 } 163 164 static struct irq_chip lpe_audio_irqchip = { 165 .name = "hdmi_lpe_audio_irqchip", 166 .irq_mask = lpe_audio_irq_mask, 167 .irq_unmask = lpe_audio_irq_unmask, 168 }; 169 170 static int lpe_audio_irq_init(struct drm_i915_private *dev_priv) 171 { 172 int irq = dev_priv->display.audio.lpe.irq; 173 174 drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)); 175 irq_set_chip_and_handler_name(irq, 176 &lpe_audio_irqchip, 177 handle_simple_irq, 178 "hdmi_lpe_audio_irq_handler"); 179 180 return irq_set_chip_data(irq, dev_priv); 181 } 182 183 static bool lpe_audio_detect(struct drm_i915_private *dev_priv) 184 { 185 int lpe_present = false; 186 187 if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) { 188 static const struct pci_device_id atom_hdaudio_ids[] = { 189 /* Baytrail */ 190 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0f04)}, 191 /* Braswell */ 192 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2284)}, 193 {} 194 }; 195 196 if (!pci_dev_present(atom_hdaudio_ids)) { 197 drm_info(&dev_priv->drm, 198 "HDaudio controller not detected, using LPE audio instead\n"); 199 lpe_present = true; 200 } 201 } 202 return lpe_present; 203 } 204 205 static int lpe_audio_setup(struct drm_i915_private *dev_priv) 206 { 207 int ret; 208 209 dev_priv->display.audio.lpe.irq = irq_alloc_desc(0); 210 if (dev_priv->display.audio.lpe.irq < 0) { 211 drm_err(&dev_priv->drm, "Failed to allocate IRQ desc: %d\n", 212 dev_priv->display.audio.lpe.irq); 213 ret = dev_priv->display.audio.lpe.irq; 214 goto err; 215 } 216 217 drm_dbg(&dev_priv->drm, "irq = %d\n", dev_priv->display.audio.lpe.irq); 218 219 ret = lpe_audio_irq_init(dev_priv); 220 221 if (ret) { 222 drm_err(&dev_priv->drm, 223 "Failed to initialize irqchip for lpe audio: %d\n", 224 ret); 225 goto err_free_irq; 226 } 227 228 dev_priv->display.audio.lpe.platdev = lpe_audio_platdev_create(dev_priv); 229 230 if (IS_ERR(dev_priv->display.audio.lpe.platdev)) { 231 ret = PTR_ERR(dev_priv->display.audio.lpe.platdev); 232 drm_err(&dev_priv->drm, 233 "Failed to create lpe audio platform device: %d\n", 234 ret); 235 goto err_free_irq; 236 } 237 238 /* enable chicken bit; at least this is required for Dell Wyse 3040 239 * with DP outputs (but only sometimes by some reason!) 240 */ 241 intel_de_write(dev_priv, VLV_AUD_CHICKEN_BIT_REG, 242 VLV_CHICKEN_BIT_DBG_ENABLE); 243 244 return 0; 245 err_free_irq: 246 irq_free_desc(dev_priv->display.audio.lpe.irq); 247 err: 248 dev_priv->display.audio.lpe.irq = -1; 249 dev_priv->display.audio.lpe.platdev = NULL; 250 return ret; 251 } 252 253 /** 254 * intel_lpe_audio_irq_handler() - forwards the LPE audio irq 255 * @dev_priv: the i915 drm device private data 256 * 257 * the LPE Audio irq is forwarded to the irq handler registered by LPE audio 258 * driver. 259 */ 260 void intel_lpe_audio_irq_handler(struct drm_i915_private *dev_priv) 261 { 262 int ret; 263 264 if (!HAS_LPE_AUDIO(dev_priv)) 265 return; 266 267 ret = generic_handle_irq(dev_priv->display.audio.lpe.irq); 268 if (ret) 269 drm_err_ratelimited(&dev_priv->drm, 270 "error handling LPE audio irq: %d\n", ret); 271 } 272 273 /** 274 * intel_lpe_audio_init() - detect and setup the bridge between HDMI LPE Audio 275 * driver and i915 276 * @dev_priv: the i915 drm device private data 277 * 278 * Return: 0 if successful. non-zero if detection or 279 * llocation/initialization fails 280 */ 281 int intel_lpe_audio_init(struct drm_i915_private *dev_priv) 282 { 283 int ret = -ENODEV; 284 285 if (lpe_audio_detect(dev_priv)) { 286 ret = lpe_audio_setup(dev_priv); 287 if (ret < 0) 288 drm_err(&dev_priv->drm, 289 "failed to setup LPE Audio bridge\n"); 290 } 291 return ret; 292 } 293 294 /** 295 * intel_lpe_audio_teardown() - destroy the bridge between HDMI LPE 296 * audio driver and i915 297 * @dev_priv: the i915 drm device private data 298 * 299 * release all the resources for LPE audio <-> i915 bridge. 300 */ 301 void intel_lpe_audio_teardown(struct drm_i915_private *dev_priv) 302 { 303 if (!HAS_LPE_AUDIO(dev_priv)) 304 return; 305 306 lpe_audio_platdev_destroy(dev_priv); 307 308 irq_free_desc(dev_priv->display.audio.lpe.irq); 309 310 dev_priv->display.audio.lpe.irq = -1; 311 dev_priv->display.audio.lpe.platdev = NULL; 312 } 313 314 /** 315 * intel_lpe_audio_notify() - notify lpe audio event 316 * audio driver and i915 317 * @dev_priv: the i915 drm device private data 318 * @cpu_transcoder: CPU transcoder 319 * @port: port 320 * @eld : ELD data 321 * @ls_clock: Link symbol clock in kHz 322 * @dp_output: Driving a DP output? 323 * 324 * Notify lpe audio driver of eld change. 325 */ 326 void intel_lpe_audio_notify(struct drm_i915_private *dev_priv, 327 enum transcoder cpu_transcoder, enum port port, 328 const void *eld, int ls_clock, bool dp_output) 329 { 330 unsigned long irqflags; 331 struct intel_hdmi_lpe_audio_pdata *pdata; 332 struct intel_hdmi_lpe_audio_port_pdata *ppdata; 333 u32 audio_enable; 334 335 if (!HAS_LPE_AUDIO(dev_priv)) 336 return; 337 338 pdata = dev_get_platdata(&dev_priv->display.audio.lpe.platdev->dev); 339 ppdata = &pdata->port[port - PORT_B]; 340 341 spin_lock_irqsave(&pdata->lpe_audio_slock, irqflags); 342 343 audio_enable = intel_de_read(dev_priv, VLV_AUD_PORT_EN_DBG(port)); 344 345 if (eld != NULL) { 346 memcpy(ppdata->eld, eld, HDMI_MAX_ELD_BYTES); 347 ppdata->pipe = cpu_transcoder; 348 ppdata->ls_clock = ls_clock; 349 ppdata->dp_output = dp_output; 350 351 /* Unmute the amp for both DP and HDMI */ 352 intel_de_write(dev_priv, VLV_AUD_PORT_EN_DBG(port), 353 audio_enable & ~VLV_AMP_MUTE); 354 } else { 355 memset(ppdata->eld, 0, HDMI_MAX_ELD_BYTES); 356 ppdata->pipe = -1; 357 ppdata->ls_clock = 0; 358 ppdata->dp_output = false; 359 360 /* Mute the amp for both DP and HDMI */ 361 intel_de_write(dev_priv, VLV_AUD_PORT_EN_DBG(port), 362 audio_enable | VLV_AMP_MUTE); 363 } 364 365 if (pdata->notify_audio_lpe) 366 pdata->notify_audio_lpe(dev_priv->display.audio.lpe.platdev, port - PORT_B); 367 368 spin_unlock_irqrestore(&pdata->lpe_audio_slock, irqflags); 369 } 370