Rob Clark | f5f9454 | 2012-12-04 13:59:12 -0600 | [diff] [blame] | 1 | /* |
Rob Clark | 8bb0daf | 2013-02-11 12:43:09 -0500 | [diff] [blame] | 2 | * drivers/gpu/drm/omapdrm/omap_irq.c |
Rob Clark | f5f9454 | 2012-12-04 13:59:12 -0600 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2012 Texas Instruments |
| 5 | * Author: Rob Clark <rob.clark@linaro.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License version 2 as published by |
| 9 | * the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 14 | * more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along with |
| 17 | * this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include "omap_drv.h" |
| 21 | |
| 22 | static DEFINE_SPINLOCK(list_lock); |
| 23 | |
| 24 | static void omap_irq_error_handler(struct omap_drm_irq *irq, |
| 25 | uint32_t irqstatus) |
| 26 | { |
| 27 | DRM_ERROR("errors: %08x\n", irqstatus); |
| 28 | } |
| 29 | |
| 30 | /* call with list_lock and dispc runtime held */ |
| 31 | static void omap_irq_update(struct drm_device *dev) |
| 32 | { |
| 33 | struct omap_drm_private *priv = dev->dev_private; |
| 34 | struct omap_drm_irq *irq; |
| 35 | uint32_t irqmask = priv->vblank_mask; |
| 36 | |
| 37 | BUG_ON(!spin_is_locked(&list_lock)); |
| 38 | |
| 39 | list_for_each_entry(irq, &priv->irq_list, node) |
| 40 | irqmask |= irq->irqmask; |
| 41 | |
| 42 | DBG("irqmask=%08x", irqmask); |
| 43 | |
| 44 | dispc_write_irqenable(irqmask); |
| 45 | dispc_read_irqenable(); /* flush posted write */ |
| 46 | } |
| 47 | |
| 48 | void omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq) |
| 49 | { |
| 50 | struct omap_drm_private *priv = dev->dev_private; |
| 51 | unsigned long flags; |
| 52 | |
| 53 | dispc_runtime_get(); |
| 54 | spin_lock_irqsave(&list_lock, flags); |
| 55 | |
| 56 | if (!WARN_ON(irq->registered)) { |
| 57 | irq->registered = true; |
| 58 | list_add(&irq->node, &priv->irq_list); |
| 59 | omap_irq_update(dev); |
| 60 | } |
| 61 | |
| 62 | spin_unlock_irqrestore(&list_lock, flags); |
| 63 | dispc_runtime_put(); |
| 64 | } |
| 65 | |
| 66 | void omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq) |
| 67 | { |
| 68 | unsigned long flags; |
| 69 | |
| 70 | dispc_runtime_get(); |
| 71 | spin_lock_irqsave(&list_lock, flags); |
| 72 | |
| 73 | if (!WARN_ON(!irq->registered)) { |
| 74 | irq->registered = false; |
| 75 | list_del(&irq->node); |
| 76 | omap_irq_update(dev); |
| 77 | } |
| 78 | |
| 79 | spin_unlock_irqrestore(&list_lock, flags); |
| 80 | dispc_runtime_put(); |
| 81 | } |
| 82 | |
| 83 | struct omap_irq_wait { |
| 84 | struct omap_drm_irq irq; |
| 85 | int count; |
| 86 | }; |
| 87 | |
| 88 | static DECLARE_WAIT_QUEUE_HEAD(wait_event); |
| 89 | |
| 90 | static void wait_irq(struct omap_drm_irq *irq, uint32_t irqstatus) |
| 91 | { |
| 92 | struct omap_irq_wait *wait = |
| 93 | container_of(irq, struct omap_irq_wait, irq); |
| 94 | wait->count--; |
| 95 | wake_up_all(&wait_event); |
| 96 | } |
| 97 | |
| 98 | struct omap_irq_wait * omap_irq_wait_init(struct drm_device *dev, |
| 99 | uint32_t irqmask, int count) |
| 100 | { |
| 101 | struct omap_irq_wait *wait = kzalloc(sizeof(*wait), GFP_KERNEL); |
| 102 | wait->irq.irq = wait_irq; |
| 103 | wait->irq.irqmask = irqmask; |
| 104 | wait->count = count; |
| 105 | omap_irq_register(dev, &wait->irq); |
| 106 | return wait; |
| 107 | } |
| 108 | |
| 109 | int omap_irq_wait(struct drm_device *dev, struct omap_irq_wait *wait, |
| 110 | unsigned long timeout) |
| 111 | { |
| 112 | int ret = wait_event_timeout(wait_event, (wait->count <= 0), timeout); |
| 113 | omap_irq_unregister(dev, &wait->irq); |
| 114 | kfree(wait); |
| 115 | if (ret == 0) |
| 116 | return -1; |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * enable_vblank - enable vblank interrupt events |
| 122 | * @dev: DRM device |
| 123 | * @crtc: which irq to enable |
| 124 | * |
| 125 | * Enable vblank interrupts for @crtc. If the device doesn't have |
| 126 | * a hardware vblank counter, this routine should be a no-op, since |
| 127 | * interrupts will have to stay on to keep the count accurate. |
| 128 | * |
| 129 | * RETURNS |
| 130 | * Zero on success, appropriate errno if the given @crtc's vblank |
| 131 | * interrupt cannot be enabled. |
| 132 | */ |
| 133 | int omap_irq_enable_vblank(struct drm_device *dev, int crtc) |
| 134 | { |
| 135 | struct omap_drm_private *priv = dev->dev_private; |
| 136 | unsigned long flags; |
| 137 | |
| 138 | DBG("dev=%p, crtc=%d", dev, crtc); |
| 139 | |
| 140 | dispc_runtime_get(); |
| 141 | spin_lock_irqsave(&list_lock, flags); |
| 142 | priv->vblank_mask |= pipe2vbl(crtc); |
| 143 | omap_irq_update(dev); |
| 144 | spin_unlock_irqrestore(&list_lock, flags); |
| 145 | dispc_runtime_put(); |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * disable_vblank - disable vblank interrupt events |
| 152 | * @dev: DRM device |
| 153 | * @crtc: which irq to enable |
| 154 | * |
| 155 | * Disable vblank interrupts for @crtc. If the device doesn't have |
| 156 | * a hardware vblank counter, this routine should be a no-op, since |
| 157 | * interrupts will have to stay on to keep the count accurate. |
| 158 | */ |
| 159 | void omap_irq_disable_vblank(struct drm_device *dev, int crtc) |
| 160 | { |
| 161 | struct omap_drm_private *priv = dev->dev_private; |
| 162 | unsigned long flags; |
| 163 | |
| 164 | DBG("dev=%p, crtc=%d", dev, crtc); |
| 165 | |
| 166 | dispc_runtime_get(); |
| 167 | spin_lock_irqsave(&list_lock, flags); |
| 168 | priv->vblank_mask &= ~pipe2vbl(crtc); |
| 169 | omap_irq_update(dev); |
| 170 | spin_unlock_irqrestore(&list_lock, flags); |
| 171 | dispc_runtime_put(); |
| 172 | } |
| 173 | |
| 174 | irqreturn_t omap_irq_handler(DRM_IRQ_ARGS) |
| 175 | { |
| 176 | struct drm_device *dev = (struct drm_device *) arg; |
| 177 | struct omap_drm_private *priv = dev->dev_private; |
| 178 | struct omap_drm_irq *handler, *n; |
| 179 | unsigned long flags; |
| 180 | unsigned int id; |
| 181 | u32 irqstatus; |
| 182 | |
| 183 | irqstatus = dispc_read_irqstatus(); |
| 184 | dispc_clear_irqstatus(irqstatus); |
| 185 | dispc_read_irqstatus(); /* flush posted write */ |
| 186 | |
| 187 | VERB("irqs: %08x", irqstatus); |
| 188 | |
| 189 | for (id = 0; id < priv->num_crtcs; id++) |
| 190 | if (irqstatus & pipe2vbl(id)) |
| 191 | drm_handle_vblank(dev, id); |
| 192 | |
| 193 | spin_lock_irqsave(&list_lock, flags); |
| 194 | list_for_each_entry_safe(handler, n, &priv->irq_list, node) { |
| 195 | if (handler->irqmask & irqstatus) { |
| 196 | spin_unlock_irqrestore(&list_lock, flags); |
| 197 | handler->irq(handler, handler->irqmask & irqstatus); |
| 198 | spin_lock_irqsave(&list_lock, flags); |
| 199 | } |
| 200 | } |
| 201 | spin_unlock_irqrestore(&list_lock, flags); |
| 202 | |
| 203 | return IRQ_HANDLED; |
| 204 | } |
| 205 | |
| 206 | void omap_irq_preinstall(struct drm_device *dev) |
| 207 | { |
| 208 | DBG("dev=%p", dev); |
| 209 | dispc_runtime_get(); |
| 210 | dispc_clear_irqstatus(0xffffffff); |
| 211 | dispc_runtime_put(); |
| 212 | } |
| 213 | |
| 214 | int omap_irq_postinstall(struct drm_device *dev) |
| 215 | { |
| 216 | struct omap_drm_private *priv = dev->dev_private; |
| 217 | struct omap_drm_irq *error_handler = &priv->error_handler; |
| 218 | |
| 219 | DBG("dev=%p", dev); |
| 220 | |
| 221 | INIT_LIST_HEAD(&priv->irq_list); |
| 222 | |
| 223 | error_handler->irq = omap_irq_error_handler; |
| 224 | error_handler->irqmask = DISPC_IRQ_OCP_ERR; |
| 225 | |
| 226 | /* for now ignore DISPC_IRQ_SYNC_LOST_DIGIT.. really I think |
| 227 | * we just need to ignore it while enabling tv-out |
| 228 | */ |
| 229 | error_handler->irqmask &= ~DISPC_IRQ_SYNC_LOST_DIGIT; |
| 230 | |
| 231 | omap_irq_register(dev, error_handler); |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | void omap_irq_uninstall(struct drm_device *dev) |
| 237 | { |
| 238 | DBG("dev=%p", dev); |
| 239 | // TODO prolly need to call drm_irq_uninstall() somewhere too |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * We need a special version, instead of just using drm_irq_install(), |
| 244 | * because we need to register the irq via omapdss. Once omapdss and |
| 245 | * omapdrm are merged together we can assign the dispc hwmod data to |
| 246 | * ourselves and drop these and just use drm_irq_{install,uninstall}() |
| 247 | */ |
| 248 | |
| 249 | int omap_drm_irq_install(struct drm_device *dev) |
| 250 | { |
| 251 | int ret; |
| 252 | |
| 253 | mutex_lock(&dev->struct_mutex); |
| 254 | |
| 255 | if (dev->irq_enabled) { |
| 256 | mutex_unlock(&dev->struct_mutex); |
| 257 | return -EBUSY; |
| 258 | } |
| 259 | dev->irq_enabled = 1; |
| 260 | mutex_unlock(&dev->struct_mutex); |
| 261 | |
| 262 | /* Before installing handler */ |
| 263 | if (dev->driver->irq_preinstall) |
| 264 | dev->driver->irq_preinstall(dev); |
| 265 | |
| 266 | ret = dispc_request_irq(dev->driver->irq_handler, dev); |
| 267 | |
| 268 | if (ret < 0) { |
| 269 | mutex_lock(&dev->struct_mutex); |
| 270 | dev->irq_enabled = 0; |
| 271 | mutex_unlock(&dev->struct_mutex); |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | /* After installing handler */ |
| 276 | if (dev->driver->irq_postinstall) |
| 277 | ret = dev->driver->irq_postinstall(dev); |
| 278 | |
| 279 | if (ret < 0) { |
| 280 | mutex_lock(&dev->struct_mutex); |
| 281 | dev->irq_enabled = 0; |
| 282 | mutex_unlock(&dev->struct_mutex); |
| 283 | dispc_free_irq(dev); |
| 284 | } |
| 285 | |
| 286 | return ret; |
| 287 | } |
| 288 | |
| 289 | int omap_drm_irq_uninstall(struct drm_device *dev) |
| 290 | { |
| 291 | unsigned long irqflags; |
| 292 | int irq_enabled, i; |
| 293 | |
| 294 | mutex_lock(&dev->struct_mutex); |
| 295 | irq_enabled = dev->irq_enabled; |
| 296 | dev->irq_enabled = 0; |
| 297 | mutex_unlock(&dev->struct_mutex); |
| 298 | |
| 299 | /* |
| 300 | * Wake up any waiters so they don't hang. |
| 301 | */ |
| 302 | if (dev->num_crtcs) { |
| 303 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| 304 | for (i = 0; i < dev->num_crtcs; i++) { |
| 305 | DRM_WAKEUP(&dev->vbl_queue[i]); |
| 306 | dev->vblank_enabled[i] = 0; |
| 307 | dev->last_vblank[i] = |
| 308 | dev->driver->get_vblank_counter(dev, i); |
| 309 | } |
| 310 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| 311 | } |
| 312 | |
| 313 | if (!irq_enabled) |
| 314 | return -EINVAL; |
| 315 | |
| 316 | if (dev->driver->irq_uninstall) |
| 317 | dev->driver->irq_uninstall(dev); |
| 318 | |
| 319 | dispc_free_irq(dev); |
| 320 | |
| 321 | return 0; |
| 322 | } |