drivers/media/pci/cobalt/cobalt-irq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  cobalt interrupt handling
   4  *
   5  *  Copyright 2012-2015 Cisco Systems, Inc. and/or its affiliates.
   6  *  All rights reserved.
   7  */
   8
   9 #include <media/i2c/adv7604.h>
  10
  11 #include "cobalt-driver.h"
  12 #include "cobalt-irq.h"
  13 #include "cobalt-omnitek.h"
  14
  15 static void cobalt_dma_stream_queue_handler(struct cobalt_stream *s)
  16 {
  17         struct cobalt *cobalt = s->cobalt;
  18         int rx = s->video_channel;
  19         struct m00473_freewheel_regmap __iomem *fw =
  20                 COBALT_CVI_FREEWHEEL(s->cobalt, rx);
  21         struct m00233_video_measure_regmap __iomem *vmr =
  22                 COBALT_CVI_VMR(s->cobalt, rx);
  23         struct m00389_cvi_regmap __iomem *cvi =
  24                 COBALT_CVI(s->cobalt, rx);
  25         struct m00479_clk_loss_detector_regmap __iomem *clkloss =
  26                 COBALT_CVI_CLK_LOSS(s->cobalt, rx);
  27         struct cobalt_buffer *cb;
  28         bool skip = false;
  29
  30         spin_lock(&s->irqlock);
  31
  32         if (list_empty(&s->bufs)) {
  33                 pr_err("no buffers!\n");
  34                 spin_unlock(&s->irqlock);
  35                 return;
  36         }
  37
  38         /* Give the fresh filled up buffer to the user.
  39          * Note that the interrupt is only sent if the DMA can continue
  40          * with a new buffer, so it is always safe to return this buffer
  41          * to userspace. */
  42         cb = list_first_entry(&s->bufs, struct cobalt_buffer, list);
  43         list_del(&cb->list);
  44         spin_unlock(&s->irqlock);
  45
  46         if (s->is_audio || s->is_output)
  47                 goto done;
  48
  49         if (s->unstable_frame) {
  50                 uint32_t stat = ioread32(&vmr->irq_status);
  51
  52                 iowrite32(stat, &vmr->irq_status);
  53                 if (!(ioread32(&vmr->status) &
  54                       M00233_STATUS_BITMAP_INIT_DONE_MSK)) {
  55                         cobalt_dbg(1, "!init_done\n");
  56                         if (s->enable_freewheel)
  57                                 goto restart_fw;
  58                         goto done;
  59                 }
  60
  61                 if (ioread32(&clkloss->status) &
  62                     M00479_STATUS_BITMAP_CLOCK_MISSING_MSK) {
  63                         iowrite32(0, &clkloss->ctrl);
  64                         iowrite32(M00479_CTRL_BITMAP_ENABLE_MSK, &clkloss->ctrl);
  65                         cobalt_dbg(1, "no clock\n");
  66                         if (s->enable_freewheel)
  67                                 goto restart_fw;
  68                         goto done;
  69                 }
  70                 if ((stat & (M00233_IRQ_STATUS_BITMAP_VACTIVE_AREA_MSK |
  71                              M00233_IRQ_STATUS_BITMAP_HACTIVE_AREA_MSK)) ||
  72                                 ioread32(&vmr->vactive_area) != s->timings.bt.height ||
  73                                 ioread32(&vmr->hactive_area) != s->timings.bt.width) {
  74                         cobalt_dbg(1, "unstable\n");
  75                         if (s->enable_freewheel)
  76                                 goto restart_fw;
  77                         goto done;
  78                 }
  79                 if (!s->enable_cvi) {
  80                         s->enable_cvi = true;
  81                         iowrite32(M00389_CONTROL_BITMAP_ENABLE_MSK, &cvi->control);
  82                         goto done;
  83                 }
  84                 if (!(ioread32(&cvi->status) & M00389_STATUS_BITMAP_LOCK_MSK)) {
  85                         cobalt_dbg(1, "cvi no lock\n");
  86                         if (s->enable_freewheel)
  87                                 goto restart_fw;
  88                         goto done;
  89                 }
  90                 if (!s->enable_freewheel) {
  91                         cobalt_dbg(1, "stable\n");
  92                         s->enable_freewheel = true;
  93                         iowrite32(0, &fw->ctrl);
  94                         goto done;
  95                 }
  96                 cobalt_dbg(1, "enabled fw\n");
  97                 iowrite32(M00233_CONTROL_BITMAP_ENABLE_MEASURE_MSK |
  98                           M00233_CONTROL_BITMAP_ENABLE_INTERRUPT_MSK,
  99                           &vmr->control);
 100                 iowrite32(M00473_CTRL_BITMAP_ENABLE_MSK, &fw->ctrl);
 101                 s->enable_freewheel = false;
 102                 s->unstable_frame = false;
 103                 s->skip_first_frames = 2;
 104                 skip = true;
 105                 goto done;
 106         }
 107         if (ioread32(&fw->status) & M00473_STATUS_BITMAP_FREEWHEEL_MODE_MSK) {
 108 restart_fw:
 109                 cobalt_dbg(1, "lost lock\n");
 110                 iowrite32(M00233_CONTROL_BITMAP_ENABLE_MEASURE_MSK,
 111                           &vmr->control);
 112                 iowrite32(M00473_CTRL_BITMAP_ENABLE_MSK |
 113                           M00473_CTRL_BITMAP_FORCE_FREEWHEEL_MODE_MSK,
 114                           &fw->ctrl);
 115                 iowrite32(0, &cvi->control);
 116                 s->unstable_frame = true;
 117                 s->enable_freewheel = false;
 118                 s->enable_cvi = false;
 119         }
 120 done:
 121         if (s->skip_first_frames) {
 122                 skip = true;
 123                 s->skip_first_frames--;
 124         }
 125         cb->vb.vb2_buf.timestamp = ktime_get_ns();
 126         /* TODO: the sequence number should be read from the FPGA so we
 127            also know about dropped frames. */
 128         cb->vb.sequence = s->sequence++;
 129         vb2_buffer_done(&cb->vb.vb2_buf,
 130                         (skip || s->unstable_frame) ?
 131                         VB2_BUF_STATE_REQUEUEING : VB2_BUF_STATE_DONE);
 132 }
 133
 134 irqreturn_t cobalt_irq_handler(int irq, void *dev_id)
 135 {
 136         struct cobalt *cobalt = (struct cobalt *)dev_id;
 137         u32 dma_interrupt =
 138                 cobalt_read_bar0(cobalt, DMA_INTERRUPT_STATUS_REG) & 0xffff;
 139         u32 mask = cobalt_read_bar1(cobalt, COBALT_SYS_STAT_MASK);
 140         u32 edge = cobalt_read_bar1(cobalt, COBALT_SYS_STAT_EDGE);
 141         int i;
 142
 143         /* Clear DMA interrupt */
 144         cobalt_write_bar0(cobalt, DMA_INTERRUPT_STATUS_REG, dma_interrupt);
 145         cobalt_write_bar1(cobalt, COBALT_SYS_STAT_MASK, mask & ~edge);
 146         cobalt_write_bar1(cobalt, COBALT_SYS_STAT_EDGE, edge);
 147
 148         for (i = 0; i < COBALT_NUM_STREAMS; i++) {
 149                 struct cobalt_stream *s = &cobalt->streams[i];
 150                 unsigned dma_fifo_mask = s->dma_fifo_mask;
 151
 152                 if (dma_interrupt & (1 << s->dma_channel)) {
 153                         cobalt->irq_dma[i]++;
 154                         /* Give fresh buffer to user and chain newly
 155                          * queued buffers */
 156                         cobalt_dma_stream_queue_handler(s);
 157                         if (!s->is_audio) {
 158                                 edge &= ~dma_fifo_mask;
 159                                 cobalt_write_bar1(cobalt, COBALT_SYS_STAT_MASK,
 160                                                   mask & ~edge);
 161                         }
 162                 }
 163                 if (s->is_audio)
 164                         continue;
 165                 if (edge & s->adv_irq_mask)
 166                         set_bit(COBALT_STREAM_FL_ADV_IRQ, &s->flags);
 167                 if ((edge & mask & dma_fifo_mask) && vb2_is_streaming(&s->q)) {
 168                         cobalt_info("full rx FIFO %d\n", i);
 169                         cobalt->irq_full_fifo++;
 170                 }
 171         }
 172
 173         queue_work(cobalt->irq_work_queues, &cobalt->irq_work_queue);
 174
 175         if (edge & mask & (COBALT_SYSSTAT_VI0_INT1_MSK |
 176                            COBALT_SYSSTAT_VI1_INT1_MSK |
 177                            COBALT_SYSSTAT_VI2_INT1_MSK |
 178                            COBALT_SYSSTAT_VI3_INT1_MSK |
 179                            COBALT_SYSSTAT_VIHSMA_INT1_MSK |
 180                            COBALT_SYSSTAT_VOHSMA_INT1_MSK))
 181                 cobalt->irq_adv1++;
 182         if (edge & mask & (COBALT_SYSSTAT_VI0_INT2_MSK |
 183                            COBALT_SYSSTAT_VI1_INT2_MSK |
 184                            COBALT_SYSSTAT_VI2_INT2_MSK |
 185                            COBALT_SYSSTAT_VI3_INT2_MSK |
 186                            COBALT_SYSSTAT_VIHSMA_INT2_MSK))
 187                 cobalt->irq_adv2++;
 188         if (edge & mask & COBALT_SYSSTAT_VOHSMA_INT1_MSK)
 189                 cobalt->irq_advout++;
 190         if (dma_interrupt)
 191                 cobalt->irq_dma_tot++;
 192         if (!(edge & mask) && !dma_interrupt)
 193                 cobalt->irq_none++;
 194         dma_interrupt = cobalt_read_bar0(cobalt, DMA_INTERRUPT_STATUS_REG);
 195
 196         return IRQ_HANDLED;
 197 }
 198
 199 void cobalt_irq_work_handler(struct work_struct *work)
 200 {
 201         struct cobalt *cobalt =
 202                 container_of(work, struct cobalt, irq_work_queue);
 203         int i;
 204
 205         for (i = 0; i < COBALT_NUM_NODES; i++) {
 206                 struct cobalt_stream *s = &cobalt->streams[i];
 207
 208                 if (test_and_clear_bit(COBALT_STREAM_FL_ADV_IRQ, &s->flags)) {
 209                         u32 mask;
 210
 211                         v4l2_subdev_call(cobalt->streams[i].sd, core,
 212                                         interrupt_service_routine, 0, NULL);
 213                         mask = cobalt_read_bar1(cobalt, COBALT_SYS_STAT_MASK);
 214                         cobalt_write_bar1(cobalt, COBALT_SYS_STAT_MASK,
 215                                 mask | s->adv_irq_mask);
 216                 }
 217         }
 218 }
 219
 220 void cobalt_irq_log_status(struct cobalt *cobalt)
 221 {
 222         u32 mask;
 223         int i;
 224
 225         cobalt_info("irq: adv1=%u adv2=%u advout=%u none=%u full=%u\n",
 226                     cobalt->irq_adv1, cobalt->irq_adv2, cobalt->irq_advout,
 227                     cobalt->irq_none, cobalt->irq_full_fifo);
 228         cobalt_info("irq: dma_tot=%u (", cobalt->irq_dma_tot);
 229         for (i = 0; i < COBALT_NUM_STREAMS; i++)
 230                 pr_cont("%s%u", i ? "/" : "", cobalt->irq_dma[i]);
 231         pr_cont(")\n");
 232         cobalt->irq_dma_tot = cobalt->irq_adv1 = cobalt->irq_adv2 = 0;
 233         cobalt->irq_advout = cobalt->irq_none = cobalt->irq_full_fifo = 0;
 234         memset(cobalt->irq_dma, 0, sizeof(cobalt->irq_dma));
 235
 236         mask = cobalt_read_bar1(cobalt, COBALT_SYS_STAT_MASK);
 237         cobalt_write_bar1(cobalt, COBALT_SYS_STAT_MASK,
 238                         mask |
 239                         COBALT_SYSSTAT_VI0_LOST_DATA_MSK |
 240                         COBALT_SYSSTAT_VI1_LOST_DATA_MSK |
 241                         COBALT_SYSSTAT_VI2_LOST_DATA_MSK |
 242                         COBALT_SYSSTAT_VI3_LOST_DATA_MSK |
 243                         COBALT_SYSSTAT_VIHSMA_LOST_DATA_MSK |
 244                         COBALT_SYSSTAT_VOHSMA_LOST_DATA_MSK |
 245                         COBALT_SYSSTAT_AUD_IN_LOST_DATA_MSK |
 246                         COBALT_SYSSTAT_AUD_OUT_LOST_DATA_MSK);
 247 }