drivers/staging/msm/mdp_ppp_dq.c

   1 /* Copyright (c) 2009-2010, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  15  * 02110-1301, USA.
  16  */
  17
  18 #include "mdp.h"
  19
  20 static boolean mdp_ppp_intr_flag = FALSE;
  21 static boolean mdp_ppp_busy_flag = FALSE;
  22
  23 /* Queue to keep track of the completed jobs for cleaning */
  24 static LIST_HEAD(mdp_ppp_djob_clnrq);
  25 static DEFINE_SPINLOCK(mdp_ppp_djob_clnrq_lock);
  26
  27 /* Worker to cleanup Display Jobs */
  28 static struct workqueue_struct *mdp_ppp_djob_clnr;
  29
  30 /* Display Queue (DQ) for MDP PPP Block */
  31 static LIST_HEAD(mdp_ppp_dq);
  32 static DEFINE_SPINLOCK(mdp_ppp_dq_lock);
  33
  34 /* Current Display Job for MDP PPP */
  35 static struct mdp_ppp_djob *curr_djob;
  36
  37 /* Track ret code for the last opeartion */
  38 static int mdp_ppp_ret_code;
  39
  40 inline int mdp_ppp_get_ret_code(void)
  41 {
  42         return mdp_ppp_ret_code;
  43 }
  44
  45 /* Push <Reg, Val> pair into DQ (if available) to later
  46  * program the MDP PPP Block */
  47 inline void mdp_ppp_outdw(uint32_t addr, uint32_t data)
  48 {
  49         if (curr_djob) {
  50
  51                 /* get the last node of the list. */
  52                 struct mdp_ppp_roi_cmd_set *node =
  53                         list_entry(curr_djob->roi_cmd_list.prev,
  54                                 struct mdp_ppp_roi_cmd_set, node);
  55
  56                 /* If a node is already full, create a new one and add it to
  57                  * the list (roi_cmd_list).
  58                  */
  59                 if (node->ncmds == MDP_PPP_ROI_NODE_SIZE) {
  60                         node = kmalloc(sizeof(struct mdp_ppp_roi_cmd_set),
  61                                 GFP_KERNEL);
  62                         if (!node) {
  63                                 printk(KERN_ERR
  64                                         "MDP_PPP: not enough memory.\n");
  65                                 mdp_ppp_ret_code = -EINVAL;
  66                                 return;
  67                         }
  68
  69                         /* no ROI commands initially */
  70                         node->ncmds = 0;
  71
  72                         /* add one node to roi_cmd_list. */
  73                         list_add_tail(&node->node, &curr_djob->roi_cmd_list);
  74                 }
  75
  76                 /* register ROI commands */
  77                 node->cmd[node->ncmds].reg = addr;
  78                 node->cmd[node->ncmds].val = data;
  79                 node->ncmds++;
  80         } else
  81                 /* program MDP PPP block now */
  82                 outpdw((addr), (data));
  83 }
  84
  85 /* Initialize DQ */
  86 inline void mdp_ppp_dq_init(void)
  87 {
  88         mdp_ppp_djob_clnr = create_singlethread_workqueue("MDPDJobClnrThrd");
  89 }
  90
  91 /* Release resources of a job (DJob). */
  92 static void mdp_ppp_del_djob(struct mdp_ppp_djob *job)
  93 {
  94         struct mdp_ppp_roi_cmd_set *node, *tmp;
  95
  96         /* release mem */
  97         mdp_ppp_put_img(job->p_src_file, job->p_dst_file);
  98
  99         /* release roi_cmd_list */
 100         list_for_each_entry_safe(node, tmp, &job->roi_cmd_list, node) {
 101                 list_del(&node->node);
 102                 kfree(node);
 103         }
 104
 105         /* release job struct */
 106         kfree(job);
 107 }
 108
 109 /* Worker thread to reclaim resources once a display job is done */
 110 static void mdp_ppp_djob_cleaner(struct work_struct *work)
 111 {
 112         struct mdp_ppp_djob *job;
 113
 114         MDP_PPP_DEBUG_MSG("mdp ppp display job cleaner started \n");
 115
 116         /* cleanup display job */
 117         job = container_of(work, struct mdp_ppp_djob, cleaner.work);
 118         if (likely(work && job))
 119                 mdp_ppp_del_djob(job);
 120 }
 121
 122 /* Create a new Display Job (DJob) */
 123 inline struct mdp_ppp_djob *mdp_ppp_new_djob(void)
 124 {
 125         struct mdp_ppp_djob *job;
 126         struct mdp_ppp_roi_cmd_set *node;
 127
 128         /* create a new djob */
 129         job = kmalloc(sizeof(struct mdp_ppp_djob), GFP_KERNEL);
 130         if (!job)
 131                 return NULL;
 132
 133         /* add the first node to curr_djob->roi_cmd_list */
 134         node = kmalloc(sizeof(struct mdp_ppp_roi_cmd_set), GFP_KERNEL);
 135         if (!node) {
 136                 kfree(job);
 137                 return NULL;
 138         }
 139
 140         /* make this current djob container to keep track of the curr djob not
 141          * used in the async path i.e. no sync needed
 142          *
 143          * Should not contain any references from the past djob
 144          */
 145         BUG_ON(curr_djob);
 146         curr_djob = job;
 147         INIT_LIST_HEAD(&curr_djob->roi_cmd_list);
 148
 149         /* no ROI commands initially */
 150         node->ncmds = 0;
 151         INIT_LIST_HEAD(&node->node);
 152         list_add_tail(&node->node, &curr_djob->roi_cmd_list);
 153
 154         /* register this djob with the djob cleaner
 155          * initializes 'work' data struct
 156          */
 157         INIT_DELAYED_WORK(&curr_djob->cleaner, mdp_ppp_djob_cleaner);
 158         INIT_LIST_HEAD(&curr_djob->entry);
 159
 160         curr_djob->p_src_file = 0;
 161         curr_djob->p_dst_file = 0;
 162
 163         return job;
 164 }
 165
 166 /* Undo the effect of mdp_ppp_new_djob() */
 167 inline void mdp_ppp_clear_curr_djob(void)
 168 {
 169         if (likely(curr_djob)) {
 170                 mdp_ppp_del_djob(curr_djob);
 171                 curr_djob = NULL;
 172         }
 173 }
 174
 175 /* Cleanup dirty djobs */
 176 static void mdp_ppp_flush_dirty_djobs(void *cond)
 177 {
 178         unsigned long flags;
 179         struct mdp_ppp_djob *job;
 180
 181         /* Flush the jobs from the djob clnr queue */
 182         while (cond && test_bit(0, (unsigned long *)cond)) {
 183
 184                 /* Until we are done with the cleanup queue */
 185                 spin_lock_irqsave(&mdp_ppp_djob_clnrq_lock, flags);
 186                 if (list_empty(&mdp_ppp_djob_clnrq)) {
 187                         spin_unlock_irqrestore(&mdp_ppp_djob_clnrq_lock, flags);
 188                         break;
 189                 }
 190
 191                 MDP_PPP_DEBUG_MSG("flushing djobs ... loop \n");
 192
 193                 /* Retrieve the job that needs to be cleaned */
 194                 job = list_entry(mdp_ppp_djob_clnrq.next,
 195                                 struct mdp_ppp_djob, entry);
 196                 list_del_init(&job->entry);
 197                 spin_unlock_irqrestore(&mdp_ppp_djob_clnrq_lock, flags);
 198
 199                 /* Keep mem state coherent */
 200                 msm_fb_ensure_mem_coherency_after_dma(job->info, &job->req, 1);
 201
 202                 /* Schedule jobs for cleanup
 203                  * A seperate worker thread does this */
 204                 queue_delayed_work(mdp_ppp_djob_clnr, &job->cleaner,
 205                         mdp_timer_duration);
 206         }
 207 }
 208
 209 /* If MDP PPP engine is busy, wait until it is available again */
 210 void mdp_ppp_wait(void)
 211 {
 212         unsigned long flags;
 213         int cond = 1;
 214
 215         /* keep flushing dirty djobs as long as MDP PPP engine is busy */
 216         mdp_ppp_flush_dirty_djobs(&mdp_ppp_busy_flag);
 217
 218         /* block if MDP PPP engine is still busy */
 219         spin_lock_irqsave(&mdp_ppp_dq_lock, flags);
 220         if (test_bit(0, (unsigned long *)&mdp_ppp_busy_flag)) {
 221
 222                 /* prepare for the wakeup event */
 223                 test_and_set_bit(0, (unsigned long *)&mdp_ppp_waiting);
 224                 INIT_COMPLETION(mdp_ppp_comp);
 225                 spin_unlock_irqrestore(&mdp_ppp_dq_lock, flags);
 226
 227                 /* block uninterruptibly until available */
 228                 MDP_PPP_DEBUG_MSG("waiting for mdp... \n");
 229                 wait_for_completion_killable(&mdp_ppp_comp);
 230
 231                 /* if MDP PPP engine is still free,
 232                  * disable INT_MDP if enabled
 233                  */
 234                 spin_lock_irqsave(&mdp_ppp_dq_lock, flags);
 235                 if (!test_bit(0, (unsigned long *)&mdp_ppp_busy_flag) &&
 236                 test_and_clear_bit(0, (unsigned long *)&mdp_ppp_intr_flag))
 237                         mdp_disable_irq(MDP_PPP_TERM);
 238         }
 239         spin_unlock_irqrestore(&mdp_ppp_dq_lock, flags);
 240
 241         /* flush remaining dirty djobs, if any */
 242         mdp_ppp_flush_dirty_djobs(&cond);
 243 }
 244
 245 /* Program MDP PPP block to process this ROI */
 246 static void mdp_ppp_process_roi(struct list_head *roi_cmd_list)
 247 {
 248
 249         /* program PPP engine with registered ROI commands */
 250         struct mdp_ppp_roi_cmd_set *node;
 251         list_for_each_entry(node, roi_cmd_list, node) {
 252                 int i = 0;
 253                 for (; i < node->ncmds; i++) {
 254                         MDP_PPP_DEBUG_MSG("%d: reg: 0x%x val: 0x%x \n",
 255                                         i, node->cmd[i].reg, node->cmd[i].val);
 256                         outpdw(node->cmd[i].reg, node->cmd[i].val);
 257                 }
 258         }
 259
 260         /* kickoff MDP PPP engine */
 261         MDP_PPP_DEBUG_MSG("kicking off mdp \n");
 262         outpdw(MDP_BASE + 0x30, 0x1000);
 263 }
 264
 265 /* Submit this display job to MDP PPP engine */
 266 static void mdp_ppp_dispatch_djob(struct mdp_ppp_djob *job)
 267 {
 268         /* enable INT_MDP if disabled */
 269         if (!test_and_set_bit(0, (unsigned long *)&mdp_ppp_intr_flag))
 270                 mdp_enable_irq(MDP_PPP_TERM);
 271
 272         /* turn on PPP and CMD blocks */
 273         mdp_pipe_ctrl(MDP_CMD_BLOCK, MDP_BLOCK_POWER_ON, FALSE);
 274         mdp_pipe_ctrl(MDP_PPP_BLOCK, MDP_BLOCK_POWER_ON, FALSE);
 275
 276         /* process this ROI */
 277         mdp_ppp_process_roi(&job->roi_cmd_list);
 278 }
 279
 280 /* Enqueue this display job to be cleaned up later in "mdp_ppp_djob_done" */
 281 static inline void mdp_ppp_enqueue_djob(struct mdp_ppp_djob *job)
 282 {
 283         unsigned long flags;
 284
 285         spin_lock_irqsave(&mdp_ppp_dq_lock, flags);
 286         list_add_tail(&job->entry, &mdp_ppp_dq);
 287         spin_unlock_irqrestore(&mdp_ppp_dq_lock, flags);
 288 }
 289
 290 /* First enqueue display job for cleanup and dispatch immediately
 291  * if MDP PPP engine is free */
 292 void mdp_ppp_process_curr_djob(void)
 293 {
 294         /* enqueue djob */
 295         mdp_ppp_enqueue_djob(curr_djob);
 296
 297         /* dispatch now if MDP PPP engine is free */
 298         if (!test_and_set_bit(0, (unsigned long *)&mdp_ppp_busy_flag))
 299                 mdp_ppp_dispatch_djob(curr_djob);
 300
 301         /* done with the current djob */
 302         curr_djob = NULL;
 303 }
 304
 305 /* Called from mdp_isr - cleanup finished job and start with next
 306  * if available else set MDP PPP engine free */
 307 void mdp_ppp_djob_done(void)
 308 {
 309         struct mdp_ppp_djob *curr, *next;
 310         unsigned long flags;
 311
 312         /* dequeue current */
 313         spin_lock_irqsave(&mdp_ppp_dq_lock, flags);
 314         curr = list_entry(mdp_ppp_dq.next, struct mdp_ppp_djob, entry);
 315         list_del_init(&curr->entry);
 316         spin_unlock_irqrestore(&mdp_ppp_dq_lock, flags);
 317
 318         /* cleanup current - enqueue in the djob clnr queue */
 319         spin_lock_irqsave(&mdp_ppp_djob_clnrq_lock, flags);
 320         list_add_tail(&curr->entry, &mdp_ppp_djob_clnrq);
 321         spin_unlock_irqrestore(&mdp_ppp_djob_clnrq_lock, flags);
 322
 323         /* grab next pending */
 324         spin_lock_irqsave(&mdp_ppp_dq_lock, flags);
 325         if (!list_empty(&mdp_ppp_dq)) {
 326                 next = list_entry(mdp_ppp_dq.next, struct mdp_ppp_djob,
 327                         entry);
 328                 spin_unlock_irqrestore(&mdp_ppp_dq_lock, flags);
 329
 330                 /* process next in the queue */
 331                 mdp_ppp_process_roi(&next->roi_cmd_list);
 332         } else {
 333                 /* no pending display job */
 334                 spin_unlock_irqrestore(&mdp_ppp_dq_lock, flags);
 335
 336                 /* turn off PPP and CMD blocks - "in_isr" is TRUE */
 337                 mdp_pipe_ctrl(MDP_PPP_BLOCK, MDP_BLOCK_POWER_OFF, TRUE);
 338                 mdp_pipe_ctrl(MDP_CMD_BLOCK, MDP_BLOCK_POWER_OFF, TRUE);
 339
 340                 /* notify if waiting */
 341                 if (test_and_clear_bit(0, (unsigned long *)&mdp_ppp_waiting))
 342                         complete(&mdp_ppp_comp);
 343
 344                 /* set free */
 345                 test_and_clear_bit(0, (unsigned long *)&mdp_ppp_busy_flag);
 346         }
 347 }