// SPDX-License-Identifier: GPL-2.0-only
/*
 *  cobalt interrupt handling
 *
 *  Copyright 2012-2015 Cisco Systems, Inc. and/or its affiliates.
 *  All rights reserved.
 */

#include <media/i2c/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--;
        }
        cb->vb.vb2_buf.timestamp = ktime_get_ns();
        /* TODO: the sequence number should be read from the FPGA so we
           also know about dropped frames. */
        cb->vb.sequence = s->sequence++;
        vb2_buffer_done(&cb->vb.vb2_buf,
                        (skip || s->unstable_frame) ?
                        VB2_BUF_STATE_ERROR : 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);
}