text: /*
   *  cobalt interrupt handling
   *
   *  Copyright 2012-2015 Cisco Systems, Inc. and/or its affiliates.
   *  All rights reserved.
   *
   *  This program is free software; you may redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; version 2 of the License.
   *
   *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   *  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   *  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   *  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   *  SOFTWARE.
   */
  
  #include <media/adv7604.h>
  
  #include "cobalt-driver.h"
  #include "cobalt-irq.h"
  #include "cobalt-omnitek.h"
  
  static void cobalt_dma_stream_queue_handler(struct cobalt_stream *s)
  {
  	struct cobalt *cobalt = s->cobalt;
  	int rx = s->video_channel;
  	struct m00473_freewheel_regmap __iomem *fw =
  		COBALT_CVI_FREEWHEEL(s->cobalt, rx);
  	struct m00233_video_measure_regmap __iomem *vmr =
  		COBALT_CVI_VMR(s->cobalt, rx);
  	struct m00389_cvi_regmap __iomem *cvi =
  		COBALT_CVI(s->cobalt, rx);
  	struct m00479_clk_loss_detector_regmap __iomem *clkloss =
  		COBALT_CVI_CLK_LOSS(s->cobalt, rx);
  	struct cobalt_buffer *cb;
  	bool skip = false;
  
  	spin_lock(&s->irqlock);
  
  	if (list_empty(&s->bufs)) {
  		pr_err("no buffers!\n");
  		spin_unlock(&s->irqlock);
  		return;
  	}
  
  	/* Give the fresh filled up buffer to the user.
  	 * Note that the interrupt is only sent if the DMA can continue
  	 * with a new buffer, so it is always safe to return this buffer
  	 * to userspace. */
  	cb = list_first_entry(&s->bufs, struct cobalt_buffer, list);
  	list_del(&cb->list);
  	spin_unlock(&s->irqlock);
  
  	if (s->is_audio || s->is_output)
  		goto done;
  
  	if (s->unstable_frame) {
  		uint32_t stat = ioread32(&vmr->irq_status);
  
  		iowrite32(stat, &vmr->irq_status);
  		if (!(ioread32(&vmr->status) &
  		      M00233_STATUS_BITMAP_INIT_DONE_MSK)) {
  			cobalt_dbg(1, "!init_done\n");
  			if (s->enable_freewheel)
  				goto restart_fw;
  			goto done;
  		}
  
  		if (ioread32(&clkloss->status) &
  		    M00479_STATUS_BITMAP_CLOCK_MISSING_MSK) {
  			iowrite32(0, &clkloss->ctrl);
  			iowrite32(M00479_CTRL_BITMAP_ENABLE_MSK, &clkloss->ctrl);
  			cobalt_dbg(1, "no clock\n");
  			if (s->enable_freewheel)
  				goto restart_fw;
  			goto done;
  		}
  		if ((stat & (M00233_IRQ_STATUS_BITMAP_VACTIVE_AREA_MSK |
  			     M00233_IRQ_STATUS_BITMAP_HACTIVE_AREA_MSK)) ||
  				ioread32(&vmr->vactive_area) != s->timings.bt.height ||
  				ioread32(&vmr->hactive_area) != s->timings.bt.width) {
  			cobalt_dbg(1, "unstable\n");
  			if (s->enable_freewheel)
  				goto restart_fw;
  			goto done;
  		}
  		if (!s->enable_cvi) {
  			s->enable_cvi = true;
  			iowrite32(M00389_CONTROL_BITMAP_ENABLE_MSK, &cvi->control);
  			goto done;
  		}
  		if (!(ioread32(&cvi->status) & M00389_STATUS_BITMAP_LOCK_MSK)) {
  			cobalt_dbg(1, "cvi no lock\n");
  			if (s->enable_freewheel)
  				goto restart_fw;
  			goto done;
  		}
  		if (!s->enable_freewheel) {
  			cobalt_dbg(1, "stable\n");
  			s->enable_freewheel = true;
  			iowrite32(0, &fw->ctrl);
  			goto done;
  		}
  		cobalt_dbg(1, "enabled fw\n");
  		iowrite32(M00233_CONTROL_BITMAP_ENABLE_MEASURE_MSK |
  			  M00233_CONTROL_BITMAP_ENABLE_INTERRUPT_MSK,
  			  &vmr->control);
  		iowrite32(M00473_CTRL_BITMAP_ENABLE_MSK, &fw->ctrl);
  		s->enable_freewheel = false;
  		s->unstable_frame = false;
  		s->skip_first_frames = 2;
  		skip = true;
  		goto done;
  	}
  	if (ioread32(&fw->status) & M00473_STATUS_BITMAP_FREEWHEEL_MODE_MSK) {
  restart_fw:
  		cobalt_dbg(1, "lost lock\n");
  		iowrite32(M00233_CONTROL_BITMAP_ENABLE_MEASURE_MSK,
  			  &vmr->control);
  		iowrite32(M00473_CTRL_BITMAP_ENABLE_MSK |
  			  M00473_CTRL_BITMAP_FORCE_FREEWHEEL_MODE_MSK,
  			  &fw->ctrl);
  		iowrite32(0, &cvi->control);
  		s->unstable_frame = true;
  		s->enable_freewheel = false;
  		s->enable_cvi = false;
  	}
  done:
  	if (s->skip_first_frames) {
  		skip = true;
  		s->skip_first_frames--;
  	}
  	v4l2_get_timestamp(&cb->vb.v4l2_buf.timestamp);
  	/* TODO: the sequence number should be read from the FPGA so we
  	   also know about dropped frames. */
  	cb->vb.v4l2_buf.sequence = s->sequence++;
  	vb2_buffer_done(&cb->vb, (skip || s->unstable_frame) ?
  			VB2_BUF_STATE_REQUEUEING : VB2_BUF_STATE_DONE);
  }
  
  irqreturn_t cobalt_irq_handler(int irq, void *dev_id)
  {
  	struct cobalt *cobalt = (struct cobalt *)dev_id;
  	u32 dma_interrupt =
  		cobalt_read_bar0(cobalt, DMA_INTERRUPT_STATUS_REG) & 0xffff;
  	u32 mask = cobalt_read_bar1(cobalt, COBALT_SYS_STAT_MASK);
  	u32 edge = cobalt_read_bar1(cobalt, COBALT_SYS_STAT_EDGE);
  	int i;
  
  	/* Clear DMA interrupt */
  	cobalt_write_bar0(cobalt, DMA_INTERRUPT_STATUS_REG, dma_interrupt);
  	cobalt_write_bar1(cobalt, COBALT_SYS_STAT_MASK, mask & ~edge);
  	cobalt_write_bar1(cobalt, COBALT_SYS_STAT_EDGE, edge);
  
  	for (i = 0; i < COBALT_NUM_STREAMS; i++) {
  		struct cobalt_stream *s = &cobalt->streams[i];
  		unsigned dma_fifo_mask = s->dma_fifo_mask;
  
  		if (dma_interrupt & (1 << s->dma_channel)) {
  			cobalt->irq_dma[i]++;
  			/* Give fresh buffer to user and chain newly
  			 * queued buffers */
  			cobalt_dma_stream_queue_handler(s);
  			if (!s->is_audio) {
  				edge &= ~dma_fifo_mask;
  				cobalt_write_bar1(cobalt, COBALT_SYS_STAT_MASK,
  						  mask & ~edge);
  			}
  		}
  		if (s->is_audio)
  			continue;
  		if (edge & s->adv_irq_mask)
  			set_bit(COBALT_STREAM_FL_ADV_IRQ, &s->flags);
  		if ((edge & mask & dma_fifo_mask) && vb2_is_streaming(&s->q)) {
  			cobalt_info("full rx FIFO %d\n", i);
  			cobalt->irq_full_fifo++;
  		}
  	}
  
  	queue_work(cobalt->irq_work_queues, &cobalt->irq_work_queue);
  
  	if (edge & mask & (COBALT_SYSSTAT_VI0_INT1_MSK |
  			   COBALT_SYSSTAT_VI1_INT1_MSK |
  			   COBALT_SYSSTAT_VI2_INT1_MSK |
  			   COBALT_SYSSTAT_VI3_INT1_MSK |
  			   COBALT_SYSSTAT_VIHSMA_INT1_MSK |
  			   COBALT_SYSSTAT_VOHSMA_INT1_MSK))
  		cobalt->irq_adv1++;
  	if (edge & mask & (COBALT_SYSSTAT_VI0_INT2_MSK |
  			   COBALT_SYSSTAT_VI1_INT2_MSK |
  			   COBALT_SYSSTAT_VI2_INT2_MSK |
  			   COBALT_SYSSTAT_VI3_INT2_MSK |
  			   COBALT_SYSSTAT_VIHSMA_INT2_MSK))
  		cobalt->irq_adv2++;
  	if (edge & mask & COBALT_SYSSTAT_VOHSMA_INT1_MSK)
  		cobalt->irq_advout++;
  	if (dma_interrupt)
  		cobalt->irq_dma_tot++;
  	if (!(edge & mask) && !dma_interrupt)
  		cobalt->irq_none++;
  	dma_interrupt = cobalt_read_bar0(cobalt, DMA_INTERRUPT_STATUS_REG);
  
  	return IRQ_HANDLED;
  }
  
  void cobalt_irq_work_handler(struct work_struct *work)
  {
  	struct cobalt *cobalt =
  		container_of(work, struct cobalt, irq_work_queue);
  	int i;
  
  	for (i = 0; i < COBALT_NUM_NODES; i++) {
  		struct cobalt_stream *s = &cobalt->streams[i];
  
  		if (test_and_clear_bit(COBALT_STREAM_FL_ADV_IRQ, &s->flags)) {
  			u32 mask;
  
  			v4l2_subdev_call(cobalt->streams[i].sd, core,
  					interrupt_service_routine, 0, NULL);
  			mask = cobalt_read_bar1(cobalt, COBALT_SYS_STAT_MASK);
  			cobalt_write_bar1(cobalt, COBALT_SYS_STAT_MASK,
  				mask | s->adv_irq_mask);
  		}
  	}
  }
  
  void cobalt_irq_log_status(struct cobalt *cobalt)
  {
  	u32 mask;
  	int i;
  
  	cobalt_info("irq: adv1=%u adv2=%u advout=%u none=%u full=%u\n",
  		    cobalt->irq_adv1, cobalt->irq_adv2, cobalt->irq_advout,
  		    cobalt->irq_none, cobalt->irq_full_fifo);
  	cobalt_info("irq: dma_tot=%u (", cobalt->irq_dma_tot);
  	for (i = 0; i < COBALT_NUM_STREAMS; i++)
  		pr_cont("%s%u", i ? "/" : "", cobalt->irq_dma[i]);
  	pr_cont(")\n");
  	cobalt->irq_dma_tot = cobalt->irq_adv1 = cobalt->irq_adv2 = 0;
  	cobalt->irq_advout = cobalt->irq_none = cobalt->irq_full_fifo = 0;
  	memset(cobalt->irq_dma, 0, sizeof(cobalt->irq_dma));
  
  	mask = cobalt_read_bar1(cobalt, COBALT_SYS_STAT_MASK);
  	cobalt_write_bar1(cobalt, COBALT_SYS_STAT_MASK,
  			mask |
  			COBALT_SYSSTAT_VI0_LOST_DATA_MSK |
  			COBALT_SYSSTAT_VI1_LOST_DATA_MSK |
  			COBALT_SYSSTAT_VI2_LOST_DATA_MSK |
  			COBALT_SYSSTAT_VI3_LOST_DATA_MSK |
  			COBALT_SYSSTAT_VIHSMA_LOST_DATA_MSK |
  			COBALT_SYSSTAT_VOHSMA_LOST_DATA_MSK |
  			COBALT_SYSSTAT_AUD_IN_LOST_DATA_MSK |
  			COBALT_SYSSTAT_AUD_OUT_LOST_DATA_MSK);
  }
  