diff options
Diffstat (limited to 'drivers/media/platform/rcar_drif.c')
| -rw-r--r-- | drivers/media/platform/rcar_drif.c | 1499 |
1 files changed, 1499 insertions, 0 deletions
diff --git a/drivers/media/platform/rcar_drif.c b/drivers/media/platform/rcar_drif.c new file mode 100644 index 000000000..81413ab52 --- /dev/null +++ b/drivers/media/platform/rcar_drif.c @@ -0,0 +1,1499 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * R-Car Gen3 Digital Radio Interface (DRIF) driver + * + * Copyright (C) 2017 Renesas Electronics Corporation + * + * 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; + + 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); + ret = -ENODEV; + 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 = -EINVAL; + + /* + * 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 != + 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; +} + +static const struct v4l2_async_notifier_operations rcar_drif_notify_ops = { + .bound = rcar_drif_notify_bound, + .unbind = rcar_drif_notify_unbind, + .complete = rcar_drif_notify_complete, +}; + +/* 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; + 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.ops = &rcar_drif_notify_ops; + + /* 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"); +MODULE_AUTHOR("Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>"); |