--- /dev/null
+/*
+ * R-Car Gen3 Digital Radio Interface (DRIF) driver
+ *
+ * Copyright (C) 2017 Renesas Electronics Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * The R-Car DRIF is a receive only MSIOF like controller with an
+ * external master device driving the SCK. It receives data into a FIFO,
+ * then this driver uses the SYS-DMAC engine to move the data from
+ * the device to memory.
+ *
+ * Each DRIF channel DRIFx (as per datasheet) contains two internal
+ * channels DRIFx0 & DRIFx1 within itself with each having its own resources
+ * like module clk, register set, irq and dma. These internal channels share
+ * common CLK & SYNC from master. The two data pins D0 & D1 shall be
+ * considered to represent the two internal channels. This internal split
+ * is not visible to the master device.
+ *
+ * Depending on the master device, a DRIF channel can use
+ * (1) both internal channels (D0 & D1) to receive data in parallel (or)
+ * (2) one internal channel (D0 or D1) to receive data
+ *
+ * The primary design goal of this controller is to act as a Digital Radio
+ * Interface that receives digital samples from a tuner device. Hence the
+ * driver exposes the device as a V4L2 SDR device. In order to qualify as
+ * a V4L2 SDR device, it should possess a tuner interface as mandated by the
+ * framework. This driver expects a tuner driver (sub-device) to bind
+ * asynchronously with this device and the combined drivers shall expose
+ * a V4L2 compliant SDR device. The DRIF driver is independent of the
+ * tuner vendor.
+ *
+ * The DRIF h/w can support I2S mode and Frame start synchronization pulse mode.
+ * This driver is tested for I2S mode only because of the availability of
+ * suitable master devices. Hence, not all configurable options of DRIF h/w
+ * like lsb/msb first, syncdl, dtdl etc. are exposed via DT and I2S defaults
+ * are used. These can be exposed later if needed after testing.
+ */
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/ioctl.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-v4l2.h>
+#include <media/videobuf2-vmalloc.h>
+
+/* DRIF register offsets */
+#define RCAR_DRIF_SITMDR1 0x00
+#define RCAR_DRIF_SITMDR2 0x04
+#define RCAR_DRIF_SITMDR3 0x08
+#define RCAR_DRIF_SIRMDR1 0x10
+#define RCAR_DRIF_SIRMDR2 0x14
+#define RCAR_DRIF_SIRMDR3 0x18
+#define RCAR_DRIF_SICTR 0x28
+#define RCAR_DRIF_SIFCTR 0x30
+#define RCAR_DRIF_SISTR 0x40
+#define RCAR_DRIF_SIIER 0x44
+#define RCAR_DRIF_SIRFDR 0x60
+
+#define RCAR_DRIF_RFOVF BIT(3) /* Receive FIFO overflow */
+#define RCAR_DRIF_RFUDF BIT(4) /* Receive FIFO underflow */
+#define RCAR_DRIF_RFSERR BIT(5) /* Receive frame sync error */
+#define RCAR_DRIF_REOF BIT(7) /* Frame reception end */
+#define RCAR_DRIF_RDREQ BIT(12) /* Receive data xfer req */
+#define RCAR_DRIF_RFFUL BIT(13) /* Receive FIFO full */
+
+/* SIRMDR1 */
+#define RCAR_DRIF_SIRMDR1_SYNCMD_FRAME (0 << 28)
+#define RCAR_DRIF_SIRMDR1_SYNCMD_LR (3 << 28)
+
+#define RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH (0 << 25)
+#define RCAR_DRIF_SIRMDR1_SYNCAC_POL_LOW (1 << 25)
+
+#define RCAR_DRIF_SIRMDR1_MSB_FIRST (0 << 24)
+#define RCAR_DRIF_SIRMDR1_LSB_FIRST (1 << 24)
+
+#define RCAR_DRIF_SIRMDR1_DTDL_0 (0 << 20)
+#define RCAR_DRIF_SIRMDR1_DTDL_1 (1 << 20)
+#define RCAR_DRIF_SIRMDR1_DTDL_2 (2 << 20)
+#define RCAR_DRIF_SIRMDR1_DTDL_0PT5 (5 << 20)
+#define RCAR_DRIF_SIRMDR1_DTDL_1PT5 (6 << 20)
+
+#define RCAR_DRIF_SIRMDR1_SYNCDL_0 (0 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_1 (1 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_2 (2 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_3 (3 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_0PT5 (5 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_1PT5 (6 << 20)
+
+#define RCAR_DRIF_MDR_GRPCNT(n) (((n) - 1) << 30)
+#define RCAR_DRIF_MDR_BITLEN(n) (((n) - 1) << 24)
+#define RCAR_DRIF_MDR_WDCNT(n) (((n) - 1) << 16)
+
+/* Hidden Transmit register that controls CLK & SYNC */
+#define RCAR_DRIF_SITMDR1_PCON BIT(30)
+
+#define RCAR_DRIF_SICTR_RX_RISING_EDGE BIT(26)
+#define RCAR_DRIF_SICTR_RX_EN BIT(8)
+#define RCAR_DRIF_SICTR_RESET BIT(0)
+
+/* Constants */
+#define RCAR_DRIF_NUM_HWBUFS 32
+#define RCAR_DRIF_MAX_DEVS 4
+#define RCAR_DRIF_DEFAULT_NUM_HWBUFS 16
+#define RCAR_DRIF_DEFAULT_HWBUF_SIZE (4 * PAGE_SIZE)
+#define RCAR_DRIF_MAX_CHANNEL 2
+#define RCAR_SDR_BUFFER_SIZE SZ_64K
+
+/* Internal buffer status flags */
+#define RCAR_DRIF_BUF_DONE BIT(0) /* DMA completed */
+#define RCAR_DRIF_BUF_OVERFLOW BIT(1) /* Overflow detected */
+
+#define to_rcar_drif_buf_pair(sdr, ch_num, idx) \
+ (&((sdr)->ch[!(ch_num)]->buf[(idx)]))
+
+#define for_each_rcar_drif_channel(ch, ch_mask) \
+ for_each_set_bit(ch, ch_mask, RCAR_DRIF_MAX_CHANNEL)
+
+/* Debug */
+#define rdrif_dbg(sdr, fmt, arg...) \
+ dev_dbg(sdr->v4l2_dev.dev, fmt, ## arg)
+
+#define rdrif_err(sdr, fmt, arg...) \
+ dev_err(sdr->v4l2_dev.dev, fmt, ## arg)
+
+/* Stream formats */
+struct rcar_drif_format {
+ u32 pixelformat;
+ u32 buffersize;
+ u32 bitlen;
+ u32 wdcnt;
+ u32 num_ch;
+};
+
+/* Format descriptions for capture */
+static const struct rcar_drif_format formats[] = {
+ {
+ .pixelformat = V4L2_SDR_FMT_PCU16BE,
+ .buffersize = RCAR_SDR_BUFFER_SIZE,
+ .bitlen = 16,
+ .wdcnt = 1,
+ .num_ch = 2,
+ },
+ {
+ .pixelformat = V4L2_SDR_FMT_PCU18BE,
+ .buffersize = RCAR_SDR_BUFFER_SIZE,
+ .bitlen = 18,
+ .wdcnt = 1,
+ .num_ch = 2,
+ },
+ {
+ .pixelformat = V4L2_SDR_FMT_PCU20BE,
+ .buffersize = RCAR_SDR_BUFFER_SIZE,
+ .bitlen = 20,
+ .wdcnt = 1,
+ .num_ch = 2,
+ },
+};
+
+/* Buffer for a received frame from one or both internal channels */
+struct rcar_drif_frame_buf {
+ /* Common v4l buffer stuff -- must be first */
+ struct vb2_v4l2_buffer vb;
+ struct list_head list;
+};
+
+/* OF graph endpoint's V4L2 async data */
+struct rcar_drif_graph_ep {
+ struct v4l2_subdev *subdev; /* Async matched subdev */
+ struct v4l2_async_subdev asd; /* Async sub-device descriptor */
+};
+
+/* DMA buffer */
+struct rcar_drif_hwbuf {
+ void *addr; /* CPU-side address */
+ unsigned int status; /* Buffer status flags */
+};
+
+/* Internal channel */
+struct rcar_drif {
+ struct rcar_drif_sdr *sdr; /* Group device */
+ struct platform_device *pdev; /* Channel's pdev */
+ void __iomem *base; /* Base register address */
+ resource_size_t start; /* I/O resource offset */
+ struct dma_chan *dmach; /* Reserved DMA channel */
+ struct clk *clk; /* Module clock */
+ struct rcar_drif_hwbuf buf[RCAR_DRIF_NUM_HWBUFS]; /* H/W bufs */
+ dma_addr_t dma_handle; /* Handle for all bufs */
+ unsigned int num; /* Channel number */
+ bool acting_sdr; /* Channel acting as SDR device */
+};
+
+/* DRIF V4L2 SDR */
+struct rcar_drif_sdr {
+ struct device *dev; /* Platform device */
+ struct video_device *vdev; /* V4L2 SDR device */
+ struct v4l2_device v4l2_dev; /* V4L2 device */
+
+ /* Videobuf2 queue and queued buffers list */
+ struct vb2_queue vb_queue;
+ struct list_head queued_bufs;
+ spinlock_t queued_bufs_lock; /* Protects queued_bufs */
+ spinlock_t dma_lock; /* To serialize DMA cb of channels */
+
+ struct mutex v4l2_mutex; /* To serialize ioctls */
+ struct mutex vb_queue_mutex; /* To serialize streaming ioctls */
+ struct v4l2_ctrl_handler ctrl_hdl; /* SDR control handler */
+ struct v4l2_async_notifier notifier; /* For subdev (tuner) */
+ struct rcar_drif_graph_ep ep; /* Endpoint V4L2 async data */
+
+ /* Current V4L2 SDR format ptr */
+ const struct rcar_drif_format *fmt;
+
+ /* Device tree SYNC properties */
+ u32 mdr1;
+
+ /* Internals */
+ struct rcar_drif *ch[RCAR_DRIF_MAX_CHANNEL]; /* DRIFx0,1 */
+ unsigned long hw_ch_mask; /* Enabled channels per DT */
+ unsigned long cur_ch_mask; /* Used channels for an SDR FMT */
+ u32 num_hw_ch; /* Num of DT enabled channels */
+ u32 num_cur_ch; /* Num of used channels */
+ u32 hwbuf_size; /* Each DMA buffer size */
+ u32 produced; /* Buffers produced by sdr dev */
+};
+
+/* Register access functions */
+static void rcar_drif_write(struct rcar_drif *ch, u32 offset, u32 data)
+{
+ writel(data, ch->base + offset);
+}
+
+static u32 rcar_drif_read(struct rcar_drif *ch, u32 offset)
+{
+ return readl(ch->base + offset);
+}
+
+/* Release DMA channels */
+static void rcar_drif_release_dmachannels(struct rcar_drif_sdr *sdr)
+{
+ unsigned int i;
+
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask)
+ if (sdr->ch[i]->dmach) {
+ dma_release_channel(sdr->ch[i]->dmach);
+ sdr->ch[i]->dmach = NULL;
+ }
+}
+
+/* Allocate DMA channels */
+static int rcar_drif_alloc_dmachannels(struct rcar_drif_sdr *sdr)
+{
+ struct dma_slave_config dma_cfg;
+ unsigned int i;
+ int ret = -ENODEV;
+
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ struct rcar_drif *ch = sdr->ch[i];
+
+ ch->dmach = dma_request_slave_channel(&ch->pdev->dev, "rx");
+ if (!ch->dmach) {
+ rdrif_err(sdr, "ch%u: dma channel req failed\n", i);
+ goto dmach_error;
+ }
+
+ /* Configure slave */
+ memset(&dma_cfg, 0, sizeof(dma_cfg));
+ dma_cfg.src_addr = (phys_addr_t)(ch->start + RCAR_DRIF_SIRFDR);
+ dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ ret = dmaengine_slave_config(ch->dmach, &dma_cfg);
+ if (ret) {
+ rdrif_err(sdr, "ch%u: dma slave config failed\n", i);
+ goto dmach_error;
+ }
+ }
+ return 0;
+
+dmach_error:
+ rcar_drif_release_dmachannels(sdr);
+ return ret;
+}
+
+/* Release queued vb2 buffers */
+static void rcar_drif_release_queued_bufs(struct rcar_drif_sdr *sdr,
+ enum vb2_buffer_state state)
+{
+ struct rcar_drif_frame_buf *fbuf, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sdr->queued_bufs_lock, flags);
+ list_for_each_entry_safe(fbuf, tmp, &sdr->queued_bufs, list) {
+ list_del(&fbuf->list);
+ vb2_buffer_done(&fbuf->vb.vb2_buf, state);
+ }
+ spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
+}
+
+/* Set MDR defaults */
+static inline void rcar_drif_set_mdr1(struct rcar_drif_sdr *sdr)
+{
+ unsigned int i;
+
+ /* Set defaults for enabled internal channels */
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ /* Refer MSIOF section in manual for this register setting */
+ rcar_drif_write(sdr->ch[i], RCAR_DRIF_SITMDR1,
+ RCAR_DRIF_SITMDR1_PCON);
+
+ /* Setup MDR1 value */
+ rcar_drif_write(sdr->ch[i], RCAR_DRIF_SIRMDR1, sdr->mdr1);
+
+ rdrif_dbg(sdr, "ch%u: mdr1 = 0x%08x",
+ i, rcar_drif_read(sdr->ch[i], RCAR_DRIF_SIRMDR1));
+ }
+}
+
+/* Set DRIF receive format */
+static int rcar_drif_set_format(struct rcar_drif_sdr *sdr)
+{
+ unsigned int i;
+
+ rdrif_dbg(sdr, "setfmt: bitlen %u wdcnt %u num_ch %u\n",
+ sdr->fmt->bitlen, sdr->fmt->wdcnt, sdr->fmt->num_ch);
+
+ /* Sanity check */
+ if (sdr->fmt->num_ch > sdr->num_cur_ch) {
+ rdrif_err(sdr, "fmt num_ch %u cur_ch %u mismatch\n",
+ sdr->fmt->num_ch, sdr->num_cur_ch);
+ return -EINVAL;
+ }
+
+ /* Setup group, bitlen & wdcnt */
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ u32 mdr;
+
+ /* Two groups */
+ mdr = RCAR_DRIF_MDR_GRPCNT(2) |
+ RCAR_DRIF_MDR_BITLEN(sdr->fmt->bitlen) |
+ RCAR_DRIF_MDR_WDCNT(sdr->fmt->wdcnt);
+ rcar_drif_write(sdr->ch[i], RCAR_DRIF_SIRMDR2, mdr);
+
+ mdr = RCAR_DRIF_MDR_BITLEN(sdr->fmt->bitlen) |
+ RCAR_DRIF_MDR_WDCNT(sdr->fmt->wdcnt);
+ rcar_drif_write(sdr->ch[i], RCAR_DRIF_SIRMDR3, mdr);
+
+ rdrif_dbg(sdr, "ch%u: new mdr[2,3] = 0x%08x, 0x%08x\n",
+ i, rcar_drif_read(sdr->ch[i], RCAR_DRIF_SIRMDR2),
+ rcar_drif_read(sdr->ch[i], RCAR_DRIF_SIRMDR3));
+ }
+ return 0;
+}
+
+/* Release DMA buffers */
+static void rcar_drif_release_buf(struct rcar_drif_sdr *sdr)
+{
+ unsigned int i;
+
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ struct rcar_drif *ch = sdr->ch[i];
+
+ /* First entry contains the dma buf ptr */
+ if (ch->buf[0].addr) {
+ dma_free_coherent(&ch->pdev->dev,
+ sdr->hwbuf_size * RCAR_DRIF_NUM_HWBUFS,
+ ch->buf[0].addr, ch->dma_handle);
+ ch->buf[0].addr = NULL;
+ }
+ }
+}
+
+/* Request DMA buffers */
+static int rcar_drif_request_buf(struct rcar_drif_sdr *sdr)
+{
+ int ret = -ENOMEM;
+ unsigned int i, j;
+ void *addr;
+
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ struct rcar_drif *ch = sdr->ch[i];
+
+ /* Allocate DMA buffers */
+ addr = dma_alloc_coherent(&ch->pdev->dev,
+ sdr->hwbuf_size * RCAR_DRIF_NUM_HWBUFS,
+ &ch->dma_handle, GFP_KERNEL);
+ if (!addr) {
+ rdrif_err(sdr,
+ "ch%u: dma alloc failed. num hwbufs %u size %u\n",
+ i, RCAR_DRIF_NUM_HWBUFS, sdr->hwbuf_size);
+ goto error;
+ }
+
+ /* Split the chunk and populate bufctxt */
+ for (j = 0; j < RCAR_DRIF_NUM_HWBUFS; j++) {
+ ch->buf[j].addr = addr + (j * sdr->hwbuf_size);
+ ch->buf[j].status = 0;
+ }
+ }
+ return 0;
+error:
+ return ret;
+}
+
+/* Setup vb_queue minimum buffer requirements */
+static int rcar_drif_queue_setup(struct vb2_queue *vq,
+ unsigned int *num_buffers, unsigned int *num_planes,
+ unsigned int sizes[], struct device *alloc_devs[])
+{
+ struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
+
+ /* Need at least 16 buffers */
+ if (vq->num_buffers + *num_buffers < 16)
+ *num_buffers = 16 - vq->num_buffers;
+
+ *num_planes = 1;
+ sizes[0] = PAGE_ALIGN(sdr->fmt->buffersize);
+ rdrif_dbg(sdr, "num_bufs %d sizes[0] %d\n", *num_buffers, sizes[0]);
+
+ return 0;
+}
+
+/* Enqueue buffer */
+static void rcar_drif_buf_queue(struct vb2_buffer *vb)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vb->vb2_queue);
+ struct rcar_drif_frame_buf *fbuf =
+ container_of(vbuf, struct rcar_drif_frame_buf, vb);
+ unsigned long flags;
+
+ rdrif_dbg(sdr, "buf_queue idx %u\n", vb->index);
+ spin_lock_irqsave(&sdr->queued_bufs_lock, flags);
+ list_add_tail(&fbuf->list, &sdr->queued_bufs);
+ spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
+}
+
+/* Get a frame buf from list */
+static struct rcar_drif_frame_buf *
+rcar_drif_get_fbuf(struct rcar_drif_sdr *sdr)
+{
+ struct rcar_drif_frame_buf *fbuf;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sdr->queued_bufs_lock, flags);
+ fbuf = list_first_entry_or_null(&sdr->queued_bufs, struct
+ rcar_drif_frame_buf, list);
+ if (!fbuf) {
+ /*
+ * App is late in enqueing buffers. Samples lost & there will
+ * be a gap in sequence number when app recovers
+ */
+ rdrif_dbg(sdr, "\napp late: prod %u\n", sdr->produced);
+ spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
+ return NULL;
+ }
+ list_del(&fbuf->list);
+ spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
+
+ return fbuf;
+}
+
+/* Helpers to set/clear buf pair status */
+static inline bool rcar_drif_bufs_done(struct rcar_drif_hwbuf **buf)
+{
+ return (buf[0]->status & buf[1]->status & RCAR_DRIF_BUF_DONE);
+}
+
+static inline bool rcar_drif_bufs_overflow(struct rcar_drif_hwbuf **buf)
+{
+ return ((buf[0]->status | buf[1]->status) & RCAR_DRIF_BUF_OVERFLOW);
+}
+
+static inline void rcar_drif_bufs_clear(struct rcar_drif_hwbuf **buf,
+ unsigned int bit)
+{
+ unsigned int i;
+
+ for (i = 0; i < RCAR_DRIF_MAX_CHANNEL; i++)
+ buf[i]->status &= ~bit;
+}
+
+/* Channel DMA complete */
+static void rcar_drif_channel_complete(struct rcar_drif *ch, u32 idx)
+{
+ u32 str;
+
+ ch->buf[idx].status |= RCAR_DRIF_BUF_DONE;
+
+ /* Check for DRIF errors */
+ str = rcar_drif_read(ch, RCAR_DRIF_SISTR);
+ if (unlikely(str & RCAR_DRIF_RFOVF)) {
+ /* Writing the same clears it */
+ rcar_drif_write(ch, RCAR_DRIF_SISTR, str);
+
+ /* Overflow: some samples are lost */
+ ch->buf[idx].status |= RCAR_DRIF_BUF_OVERFLOW;
+ }
+}
+
+/* DMA callback for each stage */
+static void rcar_drif_dma_complete(void *dma_async_param)
+{
+ struct rcar_drif *ch = dma_async_param;
+ struct rcar_drif_sdr *sdr = ch->sdr;
+ struct rcar_drif_hwbuf *buf[RCAR_DRIF_MAX_CHANNEL];
+ struct rcar_drif_frame_buf *fbuf;
+ bool overflow = false;
+ u32 idx, produced;
+ unsigned int i;
+
+ spin_lock(&sdr->dma_lock);
+
+ /* DMA can be terminated while the callback was waiting on lock */
+ if (!vb2_is_streaming(&sdr->vb_queue)) {
+ spin_unlock(&sdr->dma_lock);
+ return;
+ }
+
+ idx = sdr->produced % RCAR_DRIF_NUM_HWBUFS;
+ rcar_drif_channel_complete(ch, idx);
+
+ if (sdr->num_cur_ch == RCAR_DRIF_MAX_CHANNEL) {
+ buf[0] = ch->num ? to_rcar_drif_buf_pair(sdr, ch->num, idx) :
+ &ch->buf[idx];
+ buf[1] = ch->num ? &ch->buf[idx] :
+ to_rcar_drif_buf_pair(sdr, ch->num, idx);
+
+ /* Check if both DMA buffers are done */
+ if (!rcar_drif_bufs_done(buf)) {
+ spin_unlock(&sdr->dma_lock);
+ return;
+ }
+
+ /* Clear buf done status */
+ rcar_drif_bufs_clear(buf, RCAR_DRIF_BUF_DONE);
+
+ if (rcar_drif_bufs_overflow(buf)) {
+ overflow = true;
+ /* Clear the flag in status */
+ rcar_drif_bufs_clear(buf, RCAR_DRIF_BUF_OVERFLOW);
+ }
+ } else {
+ buf[0] = &ch->buf[idx];
+ if (buf[0]->status & RCAR_DRIF_BUF_OVERFLOW) {
+ overflow = true;
+ /* Clear the flag in status */
+ buf[0]->status &= ~RCAR_DRIF_BUF_OVERFLOW;
+ }
+ }
+
+ /* Buffer produced for consumption */
+ produced = sdr->produced++;
+ spin_unlock(&sdr->dma_lock);
+
+ rdrif_dbg(sdr, "ch%u: prod %u\n", ch->num, produced);
+
+ /* Get fbuf */
+ fbuf = rcar_drif_get_fbuf(sdr);
+ if (!fbuf)
+ return;
+
+ for (i = 0; i < RCAR_DRIF_MAX_CHANNEL; i++)
+ memcpy(vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0) +
+ i * sdr->hwbuf_size, buf[i]->addr, sdr->hwbuf_size);
+
+ fbuf->vb.field = V4L2_FIELD_NONE;
+ fbuf->vb.sequence = produced;
+ fbuf->vb.vb2_buf.timestamp = ktime_get_ns();
+ vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0, sdr->fmt->buffersize);
+
+ /* Set error state on overflow */
+ vb2_buffer_done(&fbuf->vb.vb2_buf,
+ overflow ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
+}
+
+static int rcar_drif_qbuf(struct rcar_drif *ch)
+{
+ struct rcar_drif_sdr *sdr = ch->sdr;
+ dma_addr_t addr = ch->dma_handle;
+ struct dma_async_tx_descriptor *rxd;
+ dma_cookie_t cookie;
+ int ret = -EIO;
+
+ /* Setup cyclic DMA with given buffers */
+ rxd = dmaengine_prep_dma_cyclic(ch->dmach, addr,
+ sdr->hwbuf_size * RCAR_DRIF_NUM_HWBUFS,
+ sdr->hwbuf_size, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!rxd) {
+ rdrif_err(sdr, "ch%u: prep dma cyclic failed\n", ch->num);
+ return ret;
+ }
+
+ /* Submit descriptor */
+ rxd->callback = rcar_drif_dma_complete;
+ rxd->callback_param = ch;
+ cookie = dmaengine_submit(rxd);
+ if (dma_submit_error(cookie)) {
+ rdrif_err(sdr, "ch%u: dma submit failed\n", ch->num);
+ return ret;
+ }
+
+ dma_async_issue_pending(ch->dmach);
+ return 0;
+}
+
+/* Enable reception */
+static int rcar_drif_enable_rx(struct rcar_drif_sdr *sdr)
+{
+ unsigned int i;
+ u32 ctr;
+ int ret;
+
+ /*
+ * When both internal channels are enabled, they can be synchronized
+ * only by the master
+ */
+
+ /* Enable receive */
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ ctr = rcar_drif_read(sdr->ch[i], RCAR_DRIF_SICTR);
+ ctr |= (RCAR_DRIF_SICTR_RX_RISING_EDGE |
+ RCAR_DRIF_SICTR_RX_EN);
+ rcar_drif_write(sdr->ch[i], RCAR_DRIF_SICTR, ctr);
+ }
+
+ /* Check receive enabled */
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ ret = readl_poll_timeout(sdr->ch[i]->base + RCAR_DRIF_SICTR,
+ ctr, ctr & RCAR_DRIF_SICTR_RX_EN, 7, 100000);
+ if (ret) {
+ rdrif_err(sdr, "ch%u: rx en failed. ctr 0x%08x\n", i,
+ rcar_drif_read(sdr->ch[i], RCAR_DRIF_SICTR));
+ break;
+ }
+ }
+ return ret;
+}
+
+/* Disable reception */
+static void rcar_drif_disable_rx(struct rcar_drif_sdr *sdr)
+{
+ unsigned int i;
+ u32 ctr;
+ int ret;
+
+ /* Disable receive */
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ ctr = rcar_drif_read(sdr->ch[i], RCAR_DRIF_SICTR);
+ ctr &= ~RCAR_DRIF_SICTR_RX_EN;
+ rcar_drif_write(sdr->ch[i], RCAR_DRIF_SICTR, ctr);
+ }
+
+ /* Check receive disabled */
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ ret = readl_poll_timeout(sdr->ch[i]->base + RCAR_DRIF_SICTR,
+ ctr, !(ctr & RCAR_DRIF_SICTR_RX_EN), 7, 100000);
+ if (ret)
+ dev_warn(&sdr->vdev->dev,
+ "ch%u: failed to disable rx. ctr 0x%08x\n",
+ i, rcar_drif_read(sdr->ch[i], RCAR_DRIF_SICTR));
+ }
+}
+
+/* Stop channel */
+static void rcar_drif_stop_channel(struct rcar_drif *ch)
+{
+ /* Disable DMA receive interrupt */
+ rcar_drif_write(ch, RCAR_DRIF_SIIER, 0x00000000);
+
+ /* Terminate all DMA transfers */
+ dmaengine_terminate_sync(ch->dmach);
+}
+
+/* Stop receive operation */
+static void rcar_drif_stop(struct rcar_drif_sdr *sdr)
+{
+ unsigned int i;
+
+ /* Disable Rx */
+ rcar_drif_disable_rx(sdr);
+
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask)
+ rcar_drif_stop_channel(sdr->ch[i]);
+}
+
+/* Start channel */
+static int rcar_drif_start_channel(struct rcar_drif *ch)
+{
+ struct rcar_drif_sdr *sdr = ch->sdr;
+ u32 ctr, str;
+ int ret;
+
+ /* Reset receive */
+ rcar_drif_write(ch, RCAR_DRIF_SICTR, RCAR_DRIF_SICTR_RESET);
+ ret = readl_poll_timeout(ch->base + RCAR_DRIF_SICTR, ctr,
+ !(ctr & RCAR_DRIF_SICTR_RESET), 7, 100000);
+ if (ret) {
+ rdrif_err(sdr, "ch%u: failed to reset rx. ctr 0x%08x\n",
+ ch->num, rcar_drif_read(ch, RCAR_DRIF_SICTR));
+ return ret;
+ }
+
+ /* Queue buffers for DMA */
+ ret = rcar_drif_qbuf(ch);
+ if (ret)
+ return ret;
+
+ /* Clear status register flags */
+ str = RCAR_DRIF_RFFUL | RCAR_DRIF_REOF | RCAR_DRIF_RFSERR |
+ RCAR_DRIF_RFUDF | RCAR_DRIF_RFOVF;
+ rcar_drif_write(ch, RCAR_DRIF_SISTR, str);
+
+ /* Enable DMA receive interrupt */
+ rcar_drif_write(ch, RCAR_DRIF_SIIER, 0x00009000);
+
+ return ret;
+}
+
+/* Start receive operation */
+static int rcar_drif_start(struct rcar_drif_sdr *sdr)
+{
+ unsigned long enabled = 0;
+ unsigned int i;
+ int ret;
+
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ ret = rcar_drif_start_channel(sdr->ch[i]);
+ if (ret)
+ goto start_error;
+ enabled |= BIT(i);
+ }
+
+ ret = rcar_drif_enable_rx(sdr);
+ if (ret)
+ goto enable_error;
+
+ sdr->produced = 0;
+ return ret;
+
+enable_error:
+ rcar_drif_disable_rx(sdr);
+start_error:
+ for_each_rcar_drif_channel(i, &enabled)
+ rcar_drif_stop_channel(sdr->ch[i]);
+
+ return ret;
+}
+
+/* Start streaming */
+static int rcar_drif_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
+ unsigned long enabled = 0;
+ unsigned int i;
+ int ret;
+
+ mutex_lock(&sdr->v4l2_mutex);
+
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+ ret = clk_prepare_enable(sdr->ch[i]->clk);
+ if (ret)
+ goto error;
+ enabled |= BIT(i);
+ }
+
+ /* Set default MDRx settings */
+ rcar_drif_set_mdr1(sdr);
+
+ /* Set new format */
+ ret = rcar_drif_set_format(sdr);
+ if (ret)
+ goto error;
+
+ if (sdr->num_cur_ch == RCAR_DRIF_MAX_CHANNEL)
+ sdr->hwbuf_size = sdr->fmt->buffersize / RCAR_DRIF_MAX_CHANNEL;
+ else
+ sdr->hwbuf_size = sdr->fmt->buffersize;
+
+ rdrif_dbg(sdr, "num hwbufs %u, hwbuf_size %u\n",
+ RCAR_DRIF_NUM_HWBUFS, sdr->hwbuf_size);
+
+ /* Alloc DMA channel */
+ ret = rcar_drif_alloc_dmachannels(sdr);
+ if (ret)
+ goto error;
+
+ /* Request buffers */
+ ret = rcar_drif_request_buf(sdr);
+ if (ret)
+ goto error;
+
+ /* Start Rx */
+ ret = rcar_drif_start(sdr);
+ if (ret)
+ goto error;
+
+ mutex_unlock(&sdr->v4l2_mutex);
+
+ return ret;
+
+error:
+ rcar_drif_release_queued_bufs(sdr, VB2_BUF_STATE_QUEUED);
+ rcar_drif_release_buf(sdr);
+ rcar_drif_release_dmachannels(sdr);
+ for_each_rcar_drif_channel(i, &enabled)
+ clk_disable_unprepare(sdr->ch[i]->clk);
+
+ mutex_unlock(&sdr->v4l2_mutex);
+
+ return ret;
+}
+
+/* Stop streaming */
+static void rcar_drif_stop_streaming(struct vb2_queue *vq)
+{
+ struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
+ unsigned int i;
+
+ mutex_lock(&sdr->v4l2_mutex);
+
+ /* Stop hardware streaming */
+ rcar_drif_stop(sdr);
+
+ /* Return all queued buffers to vb2 */
+ rcar_drif_release_queued_bufs(sdr, VB2_BUF_STATE_ERROR);
+
+ /* Release buf */
+ rcar_drif_release_buf(sdr);
+
+ /* Release DMA channel resources */
+ rcar_drif_release_dmachannels(sdr);
+
+ for_each_rcar_drif_channel(i, &sdr->cur_ch_mask)
+ clk_disable_unprepare(sdr->ch[i]->clk);
+
+ mutex_unlock(&sdr->v4l2_mutex);
+}
+
+/* Vb2 ops */
+static const struct vb2_ops rcar_drif_vb2_ops = {
+ .queue_setup = rcar_drif_queue_setup,
+ .buf_queue = rcar_drif_buf_queue,
+ .start_streaming = rcar_drif_start_streaming,
+ .stop_streaming = rcar_drif_stop_streaming,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};
+
+static int rcar_drif_querycap(struct file *file, void *fh,
+ struct v4l2_capability *cap)
+{
+ struct rcar_drif_sdr *sdr = video_drvdata(file);
+
+ strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
+ strlcpy(cap->card, sdr->vdev->name, sizeof(cap->card));
+ snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
+ sdr->vdev->name);
+
+ return 0;
+}
+
+static int rcar_drif_set_default_format(struct rcar_drif_sdr *sdr)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(formats); i++) {
+ /* Matching fmt based on required channels is set as default */
+ if (sdr->num_hw_ch == formats[i].num_ch) {
+ sdr->fmt = &formats[i];
+ sdr->cur_ch_mask = sdr->hw_ch_mask;
+ sdr->num_cur_ch = sdr->num_hw_ch;
+ dev_dbg(sdr->dev, "default fmt[%u]: mask %lu num %u\n",
+ i, sdr->cur_ch_mask, sdr->num_cur_ch);
+ return 0;
+ }
+ }
+ return -EINVAL;
+}
+
+static int rcar_drif_enum_fmt_sdr_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ if (f->index >= ARRAY_SIZE(formats))
+ return -EINVAL;
+
+ f->pixelformat = formats[f->index].pixelformat;
+
+ return 0;
+}
+
+static int rcar_drif_g_fmt_sdr_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct rcar_drif_sdr *sdr = video_drvdata(file);
+
+ f->fmt.sdr.pixelformat = sdr->fmt->pixelformat;
+ f->fmt.sdr.buffersize = sdr->fmt->buffersize;
+
+ return 0;
+}
+
+static int rcar_drif_s_fmt_sdr_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct rcar_drif_sdr *sdr = video_drvdata(file);
+ struct vb2_queue *q = &sdr->vb_queue;
+ unsigned int i;
+
+ if (vb2_is_busy(q))
+ return -EBUSY;
+
+ for (i = 0; i < ARRAY_SIZE(formats); i++) {
+ if (formats[i].pixelformat == f->fmt.sdr.pixelformat)
+ break;
+ }
+
+ if (i == ARRAY_SIZE(formats))
+ i = 0; /* Set the 1st format as default on no match */
+
+ sdr->fmt = &formats[i];
+ f->fmt.sdr.pixelformat = sdr->fmt->pixelformat;
+ f->fmt.sdr.buffersize = formats[i].buffersize;
+ memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
+
+ /*
+ * If a format demands one channel only out of two
+ * enabled channels, pick the 0th channel.
+ */
+ if (formats[i].num_ch < sdr->num_hw_ch) {
+ sdr->cur_ch_mask = BIT(0);
+ sdr->num_cur_ch = formats[i].num_ch;
+ } else {
+ sdr->cur_ch_mask = sdr->hw_ch_mask;
+ sdr->num_cur_ch = sdr->num_hw_ch;
+ }
+
+ rdrif_dbg(sdr, "cur: idx %u mask %lu num %u\n",
+ i, sdr->cur_ch_mask, sdr->num_cur_ch);
+
+ return 0;
+}
+
+static int rcar_drif_try_fmt_sdr_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(formats); i++) {
+ if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
+ f->fmt.sdr.buffersize = formats[i].buffersize;
+ return 0;
+ }
+ }
+
+ f->fmt.sdr.pixelformat = formats[0].pixelformat;
+ f->fmt.sdr.buffersize = formats[0].buffersize;
+ memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
+
+ return 0;
+}
+
+/* Tuner subdev ioctls */
+static int rcar_drif_enum_freq_bands(struct file *file, void *priv,
+ struct v4l2_frequency_band *band)
+{
+ struct rcar_drif_sdr *sdr = video_drvdata(file);
+
+ return v4l2_subdev_call(sdr->ep.subdev, tuner, enum_freq_bands, band);
+}
+
+static int rcar_drif_g_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ struct rcar_drif_sdr *sdr = video_drvdata(file);
+
+ return v4l2_subdev_call(sdr->ep.subdev, tuner, g_frequency, f);
+}
+
+static int rcar_drif_s_frequency(struct file *file, void *priv,
+ const struct v4l2_frequency *f)
+{
+ struct rcar_drif_sdr *sdr = video_drvdata(file);
+
+ return v4l2_subdev_call(sdr->ep.subdev, tuner, s_frequency, f);
+}
+
+static int rcar_drif_g_tuner(struct file *file, void *priv,
+ struct v4l2_tuner *vt)
+{
+ struct rcar_drif_sdr *sdr = video_drvdata(file);
+
+ return v4l2_subdev_call(sdr->ep.subdev, tuner, g_tuner, vt);
+}
+
+static int rcar_drif_s_tuner(struct file *file, void *priv,
+ const struct v4l2_tuner *vt)
+{
+ struct rcar_drif_sdr *sdr = video_drvdata(file);
+
+ return v4l2_subdev_call(sdr->ep.subdev, tuner, s_tuner, vt);
+}
+
+static const struct v4l2_ioctl_ops rcar_drif_ioctl_ops = {
+ .vidioc_querycap = rcar_drif_querycap,
+
+ .vidioc_enum_fmt_sdr_cap = rcar_drif_enum_fmt_sdr_cap,
+ .vidioc_g_fmt_sdr_cap = rcar_drif_g_fmt_sdr_cap,
+ .vidioc_s_fmt_sdr_cap = rcar_drif_s_fmt_sdr_cap,
+ .vidioc_try_fmt_sdr_cap = rcar_drif_try_fmt_sdr_cap,
+
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+
+ .vidioc_s_frequency = rcar_drif_s_frequency,
+ .vidioc_g_frequency = rcar_drif_g_frequency,
+ .vidioc_s_tuner = rcar_drif_s_tuner,
+ .vidioc_g_tuner = rcar_drif_g_tuner,
+ .vidioc_enum_freq_bands = rcar_drif_enum_freq_bands,
+ .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+ .vidioc_log_status = v4l2_ctrl_log_status,
+};
+
+static const struct v4l2_file_operations rcar_drif_fops = {
+ .owner = THIS_MODULE,
+ .open = v4l2_fh_open,
+ .release = vb2_fop_release,
+ .read = vb2_fop_read,
+ .poll = vb2_fop_poll,
+ .mmap = vb2_fop_mmap,
+ .unlocked_ioctl = video_ioctl2,
+};
+
+static int rcar_drif_sdr_register(struct rcar_drif_sdr *sdr)
+{
+ int ret;
+
+ /* Init video_device structure */
+ sdr->vdev = video_device_alloc();
+ if (!sdr->vdev)
+ return -ENOMEM;
+
+ snprintf(sdr->vdev->name, sizeof(sdr->vdev->name), "R-Car DRIF");
+ sdr->vdev->fops = &rcar_drif_fops;
+ sdr->vdev->ioctl_ops = &rcar_drif_ioctl_ops;
+ sdr->vdev->release = video_device_release;
+ sdr->vdev->lock = &sdr->v4l2_mutex;
+ sdr->vdev->queue = &sdr->vb_queue;
+ sdr->vdev->queue->lock = &sdr->vb_queue_mutex;
+ sdr->vdev->ctrl_handler = &sdr->ctrl_hdl;
+ sdr->vdev->v4l2_dev = &sdr->v4l2_dev;
+ sdr->vdev->device_caps = V4L2_CAP_SDR_CAPTURE | V4L2_CAP_TUNER |
+ V4L2_CAP_STREAMING | V4L2_CAP_READWRITE;
+ video_set_drvdata(sdr->vdev, sdr);
+
+ /* Register V4L2 SDR device */
+ ret = video_register_device(sdr->vdev, VFL_TYPE_SDR, -1);
+ if (ret) {
+ video_device_release(sdr->vdev);
+ sdr->vdev = NULL;
+ dev_err(sdr->dev, "failed video_register_device (%d)\n", ret);
+ }
+
+ return ret;
+}
+
+static void rcar_drif_sdr_unregister(struct rcar_drif_sdr *sdr)
+{
+ video_unregister_device(sdr->vdev);
+ sdr->vdev = NULL;
+}
+
+/* Sub-device bound callback */
+static int rcar_drif_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct rcar_drif_sdr *sdr =
+ container_of(notifier, struct rcar_drif_sdr, notifier);
+
+ if (sdr->ep.asd.match.fwnode.fwnode !=
+ of_fwnode_handle(subdev->dev->of_node)) {
+ rdrif_err(sdr, "subdev %s cannot bind\n", subdev->name);
+ return -EINVAL;
+ }
+
+ v4l2_set_subdev_hostdata(subdev, sdr);
+ sdr->ep.subdev = subdev;
+ rdrif_dbg(sdr, "bound asd %s\n", subdev->name);
+
+ return 0;
+}
+
+/* Sub-device unbind callback */
+static void rcar_drif_notify_unbind(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct rcar_drif_sdr *sdr =
+ container_of(notifier, struct rcar_drif_sdr, notifier);
+
+ if (sdr->ep.subdev != subdev) {
+ rdrif_err(sdr, "subdev %s is not bound\n", subdev->name);
+ return;
+ }
+
+ /* Free ctrl handler if initialized */
+ v4l2_ctrl_handler_free(&sdr->ctrl_hdl);
+ sdr->v4l2_dev.ctrl_handler = NULL;
+ sdr->ep.subdev = NULL;
+
+ rcar_drif_sdr_unregister(sdr);
+ rdrif_dbg(sdr, "unbind asd %s\n", subdev->name);
+}
+
+/* Sub-device registered notification callback */
+static int rcar_drif_notify_complete(struct v4l2_async_notifier *notifier)
+{
+ struct rcar_drif_sdr *sdr =
+ container_of(notifier, struct rcar_drif_sdr, notifier);
+ int ret;
+
+ /*
+ * The subdev tested at this point uses 4 controls. Using 10 as a worst
+ * case scenario hint. When less controls are needed there will be some
+ * unused memory and when more controls are needed the framework uses
+ * hash to manage controls within this number.
+ */
+ ret = v4l2_ctrl_handler_init(&sdr->ctrl_hdl, 10);
+ if (ret)
+ return -ENOMEM;
+
+ sdr->v4l2_dev.ctrl_handler = &sdr->ctrl_hdl;
+ ret = v4l2_device_register_subdev_nodes(&sdr->v4l2_dev);
+ if (ret) {
+ rdrif_err(sdr, "failed: register subdev nodes ret %d\n", ret);
+ goto error;
+ }
+
+ ret = v4l2_ctrl_add_handler(&sdr->ctrl_hdl,
+ sdr->ep.subdev->ctrl_handler, NULL);
+ if (ret) {
+ rdrif_err(sdr, "failed: ctrl add hdlr ret %d\n", ret);
+ goto error;
+ }
+
+ ret = rcar_drif_sdr_register(sdr);
+ if (ret)
+ goto error;
+
+ return ret;
+
+error:
+ v4l2_ctrl_handler_free(&sdr->ctrl_hdl);
+
+ return ret;
+}
+
+/* Read endpoint properties */
+static void rcar_drif_get_ep_properties(struct rcar_drif_sdr *sdr,
+ struct fwnode_handle *fwnode)
+{
+ u32 val;
+
+ /* Set the I2S defaults for SIRMDR1*/
+ sdr->mdr1 = RCAR_DRIF_SIRMDR1_SYNCMD_LR | RCAR_DRIF_SIRMDR1_MSB_FIRST |
+ RCAR_DRIF_SIRMDR1_DTDL_1 | RCAR_DRIF_SIRMDR1_SYNCDL_0;
+
+ /* Parse sync polarity from endpoint */
+ if (!fwnode_property_read_u32(fwnode, "sync-active", &val))
+ sdr->mdr1 |= val ? RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH :
+ RCAR_DRIF_SIRMDR1_SYNCAC_POL_LOW;
+ else
+ sdr->mdr1 |= RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH; /* default */
+
+ dev_dbg(sdr->dev, "mdr1 0x%08x\n", sdr->mdr1);
+}
+
+/* Parse sub-devs (tuner) to find a matching device */
+static int rcar_drif_parse_subdevs(struct rcar_drif_sdr *sdr)
+{
+ struct v4l2_async_notifier *notifier = &sdr->notifier;
+ struct fwnode_handle *fwnode, *ep;
+
+ notifier->subdevs = devm_kzalloc(sdr->dev, sizeof(*notifier->subdevs),
+ GFP_KERNEL);
+ if (!notifier->subdevs)
+ return -ENOMEM;
+
+ ep = fwnode_graph_get_next_endpoint(of_fwnode_handle(sdr->dev->of_node),
+ NULL);
+ if (!ep)
+ return 0;
+
+ notifier->subdevs[notifier->num_subdevs] = &sdr->ep.asd;
+ fwnode = fwnode_graph_get_remote_port_parent(ep);
+ if (!fwnode) {
+ dev_warn(sdr->dev, "bad remote port parent\n");
+ fwnode_handle_put(ep);
+ return -EINVAL;
+ }
+
+ sdr->ep.asd.match.fwnode.fwnode = fwnode;
+ sdr->ep.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
+ notifier->num_subdevs++;
+
+ /* Get the endpoint properties */
+ rcar_drif_get_ep_properties(sdr, ep);
+
+ fwnode_handle_put(fwnode);
+ fwnode_handle_put(ep);
+
+ return 0;
+}
+
+/* Check if the given device is the primary bond */
+static bool rcar_drif_primary_bond(struct platform_device *pdev)
+{
+ return of_property_read_bool(pdev->dev.of_node, "renesas,primary-bond");
+}
+
+/* Check if both devices of the bond are enabled */
+static struct device_node *rcar_drif_bond_enabled(struct platform_device *p)
+{
+ struct device_node *np;
+
+ np = of_parse_phandle(p->dev.of_node, "renesas,bonding", 0);
+ if (np && of_device_is_available(np))
+ return np;
+
+ return NULL;
+}
+
+/* Check if the bonded device is probed */
+static int rcar_drif_bond_available(struct rcar_drif_sdr *sdr,
+ struct device_node *np)
+{
+ struct platform_device *pdev;
+ struct rcar_drif *ch;
+ int ret = 0;
+
+ pdev = of_find_device_by_node(np);
+ if (!pdev) {
+ dev_err(sdr->dev, "failed to get bonded device from node\n");
+ return -ENODEV;
+ }
+
+ device_lock(&pdev->dev);
+ ch = platform_get_drvdata(pdev);
+ if (ch) {
+ /* Update sdr data in the bonded device */
+ ch->sdr = sdr;
+
+ /* Update sdr with bonded device data */
+ sdr->ch[ch->num] = ch;
+ sdr->hw_ch_mask |= BIT(ch->num);
+ } else {
+ /* Defer */
+ dev_info(sdr->dev, "defer probe\n");
+ ret = -EPROBE_DEFER;
+ }
+ device_unlock(&pdev->dev);
+
+ put_device(&pdev->dev);
+
+ return ret;
+}
+
+/* V4L2 SDR device probe */
+static int rcar_drif_sdr_probe(struct rcar_drif_sdr *sdr)
+{
+ int ret;
+
+ /* Validate any supported format for enabled channels */
+ ret = rcar_drif_set_default_format(sdr);
+ if (ret) {
+ dev_err(sdr->dev, "failed to set default format\n");
+ return ret;
+ }
+
+ /* Set defaults */
+ sdr->hwbuf_size = RCAR_DRIF_DEFAULT_HWBUF_SIZE;
+
+ mutex_init(&sdr->v4l2_mutex);
+ mutex_init(&sdr->vb_queue_mutex);
+ spin_lock_init(&sdr->queued_bufs_lock);
+ spin_lock_init(&sdr->dma_lock);
+ INIT_LIST_HEAD(&sdr->queued_bufs);
+
+ /* Init videobuf2 queue structure */
+ sdr->vb_queue.type = V4L2_BUF_TYPE_SDR_CAPTURE;
+ sdr->vb_queue.io_modes = VB2_READ | VB2_MMAP | VB2_DMABUF;
+ sdr->vb_queue.drv_priv = sdr;
+ sdr->vb_queue.buf_struct_size = sizeof(struct rcar_drif_frame_buf);
+ sdr->vb_queue.ops = &rcar_drif_vb2_ops;
+ sdr->vb_queue.mem_ops = &vb2_vmalloc_memops;
+ sdr->vb_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+
+ /* Init videobuf2 queue */
+ ret = vb2_queue_init(&sdr->vb_queue);
+ if (ret) {
+ dev_err(sdr->dev, "failed: vb2_queue_init ret %d\n", ret);
+ return ret;
+ }
+
+ /* Register the v4l2_device */
+ ret = v4l2_device_register(sdr->dev, &sdr->v4l2_dev);
+ if (ret) {
+ dev_err(sdr->dev, "failed: v4l2_device_register ret %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Parse subdevs after v4l2_device_register because if the subdev
+ * is already probed, bound and complete will be called immediately
+ */
+ ret = rcar_drif_parse_subdevs(sdr);
+ if (ret)
+ goto error;
+
+ sdr->notifier.bound = rcar_drif_notify_bound;
+ sdr->notifier.unbind = rcar_drif_notify_unbind;
+ sdr->notifier.complete = rcar_drif_notify_complete;
+
+ /* Register notifier */
+ ret = v4l2_async_notifier_register(&sdr->v4l2_dev, &sdr->notifier);
+ if (ret < 0) {
+ dev_err(sdr->dev, "failed: notifier register ret %d\n", ret);
+ goto error;
+ }
+
+ return ret;
+
+error:
+ v4l2_device_unregister(&sdr->v4l2_dev);
+
+ return ret;
+}
+
+/* V4L2 SDR device remove */
+static void rcar_drif_sdr_remove(struct rcar_drif_sdr *sdr)
+{
+ v4l2_async_notifier_unregister(&sdr->notifier);
+ v4l2_device_unregister(&sdr->v4l2_dev);
+}
+
+/* DRIF channel probe */
+static int rcar_drif_probe(struct platform_device *pdev)
+{
+ struct rcar_drif_sdr *sdr;
+ struct device_node *np;
+ struct rcar_drif *ch;
+ struct resource *res;
+ int ret;
+
+ /* Reserve memory for enabled channel */
+ ch = devm_kzalloc(&pdev->dev, sizeof(*ch), GFP_KERNEL);
+ if (!ch)
+ return -ENOMEM;
+
+ ch->pdev = pdev;
+
+ /* Module clock */
+ ch->clk = devm_clk_get(&pdev->dev, "fck");
+ if (IS_ERR(ch->clk)) {
+ ret = PTR_ERR(ch->clk);
+ dev_err(&pdev->dev, "clk get failed (%d)\n", ret);
+ return ret;
+ }
+
+ /* Register map */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ch->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(ch->base)) {
+ ret = PTR_ERR(ch->base);
+ dev_err(&pdev->dev, "ioremap failed (%d)\n", ret);
+ return ret;
+ }
+ ch->start = res->start;
+ platform_set_drvdata(pdev, ch);
+
+ /* Check if both channels of the bond are enabled */
+ np = rcar_drif_bond_enabled(pdev);
+ if (np) {
+ /* Check if current channel acting as primary-bond */
+ if (!rcar_drif_primary_bond(pdev)) {
+ ch->num = 1; /* Primary bond is channel 0 always */
+ of_node_put(np);
+ return 0;
+ }
+ }
+
+ /* Reserve memory for SDR structure */
+ sdr = devm_kzalloc(&pdev->dev, sizeof(*sdr), GFP_KERNEL);
+ if (!sdr) {
+ of_node_put(np);
+ return -ENOMEM;
+ }
+ ch->sdr = sdr;
+ sdr->dev = &pdev->dev;
+
+ /* Establish links between SDR and channel(s) */
+ sdr->ch[ch->num] = ch;
+ sdr->hw_ch_mask = BIT(ch->num);
+ if (np) {
+ /* Check if bonded device is ready */
+ ret = rcar_drif_bond_available(sdr, np);
+ of_node_put(np);
+ if (ret)
+ return ret;
+ }
+ sdr->num_hw_ch = hweight_long(sdr->hw_ch_mask);
+
+ return rcar_drif_sdr_probe(sdr);
+}
+
+/* DRIF channel remove */
+static int rcar_drif_remove(struct platform_device *pdev)
+{
+ struct rcar_drif *ch = platform_get_drvdata(pdev);
+ struct rcar_drif_sdr *sdr = ch->sdr;
+
+ /* Channel 0 will be the SDR instance */
+ if (ch->num)
+ return 0;
+
+ /* SDR instance */
+ rcar_drif_sdr_remove(sdr);
+
+ return 0;
+}
+
+/* FIXME: Implement suspend/resume support */
+static int __maybe_unused rcar_drif_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int __maybe_unused rcar_drif_resume(struct device *dev)
+{
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rcar_drif_pm_ops, rcar_drif_suspend,
+ rcar_drif_resume);
+
+static const struct of_device_id rcar_drif_of_table[] = {
+ { .compatible = "renesas,rcar-gen3-drif" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, rcar_drif_of_table);
+
+#define RCAR_DRIF_DRV_NAME "rcar_drif"
+static struct platform_driver rcar_drif_driver = {
+ .driver = {
+ .name = RCAR_DRIF_DRV_NAME,
+ .of_match_table = of_match_ptr(rcar_drif_of_table),
+ .pm = &rcar_drif_pm_ops,
+ },
+ .probe = rcar_drif_probe,
+ .remove = rcar_drif_remove,
+};
+
+module_platform_driver(rcar_drif_driver);
+
+MODULE_DESCRIPTION("Renesas R-Car Gen3 DRIF driver");
+MODULE_ALIAS("platform:" RCAR_DRIF_DRV_NAME);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>");
projects / linux.git / commitdiff