[PATCH v7 7/7] media: nuvoton: Add driver for NPCM video capture and encode engine
Andrzej Pietrasiewicz
andrzej.p at collabora.com
Tue Nov 22 23:21:29 AEDT 2022
Hi Marvin,
Sorry about chiming in only at v7. Please see inline below.
W dniu 22.11.2022 o 09:57, Marvin Lin pisze:
> Add driver for Video Capture/Differentiation Engine (VCD) and Encoding
> Compression Engine (ECE) present on Nuvoton NPCM SoCs. The VCD can
> capture and differentiate video data from digital or analog sources,
> then the ECE will compress the data into HEXTILE format. This driver
> implements V4L2 interfaces and provides user controls to support KVM
> feature, also tested with VNC Viewer and openbmc/obmc-ikvm.
>
> Signed-off-by: Marvin Lin <milkfafa at gmail.com>
> ---
> MAINTAINERS | 11 +
> drivers/media/platform/Kconfig | 1 +
> drivers/media/platform/Makefile | 1 +
> drivers/media/platform/nuvoton/Kconfig | 15 +
> drivers/media/platform/nuvoton/Makefile | 2 +
> drivers/media/platform/nuvoton/npcm-video.c | 2068 +++++++++++++++++++
> 6 files changed, 2098 insertions(+)
> create mode 100644 drivers/media/platform/nuvoton/Kconfig
> create mode 100644 drivers/media/platform/nuvoton/Makefile
> create mode 100644 drivers/media/platform/nuvoton/npcm-video.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2585e7edc335..00c8f50942e6 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2536,6 +2536,17 @@ F: drivers/rtc/rtc-nct3018y.c
> F: include/dt-bindings/clock/nuvoton,npcm7xx-clock.h
> F: include/dt-bindings/clock/nuvoton,npcm845-clk.h
>
> +ARM/NUVOTON NPCM VIDEO ENGINE DRIVER
> +M: Joseph Liu <kwliu at nuvoton.com>
> +M: Marvin Lin <kflin at nuvoton.com>
> +L: linux-media at vger.kernel.org
> +L: openbmc at lists.ozlabs.org (moderated for non-subscribers)
> +S: Maintained
> +F: Documentation/devicetree/bindings/media/nuvoton,npcm-video.yaml
> +F: Documentation/userspace-api/media/drivers/npcm-video.rst
> +F: drivers/media/platform/nuvoton/
> +F: include/uapi/linux/npcm-video.h
> +
> ARM/NUVOTON WPCM450 ARCHITECTURE
> M: Jonathan Neuschäfer <j.neuschaefer at gmx.net>
> L: openbmc at lists.ozlabs.org (moderated for non-subscribers)
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index a9334263fa9b..ef5d9d0fad0f 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -72,6 +72,7 @@ source "drivers/media/platform/chips-media/Kconfig"
> source "drivers/media/platform/intel/Kconfig"
> source "drivers/media/platform/marvell/Kconfig"
> source "drivers/media/platform/mediatek/Kconfig"
> +source "drivers/media/platform/nuvoton/Kconfig"
> source "drivers/media/platform/nvidia/Kconfig"
> source "drivers/media/platform/nxp/Kconfig"
> source "drivers/media/platform/qcom/Kconfig"
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index a91f42024273..4f73b5f8b5b6 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -15,6 +15,7 @@ obj-y += chips-media/
> obj-y += intel/
> obj-y += marvell/
> obj-y += mediatek/
> +obj-y += nuvoton/
> obj-y += nvidia/
> obj-y += nxp/
> obj-y += qcom/
> diff --git a/drivers/media/platform/nuvoton/Kconfig b/drivers/media/platform/nuvoton/Kconfig
> new file mode 100644
> index 000000000000..5047d1ba3de5
> --- /dev/null
> +++ b/drivers/media/platform/nuvoton/Kconfig
> @@ -0,0 +1,15 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +comment "Nuvoton media platform drivers"
> +
> +config VIDEO_NPCM_VCD_ECE
> + tristate "Nuvoton NPCM Video Capture/Encode Engine driver"
> + depends on V4L_PLATFORM_DRIVERS
> + depends on VIDEO_DEV
> + select VIDEOBUF2_DMA_CONTIG
> + help
> + Support for the Video Capture/Differentiation Engine (VCD) and
> + Encoding Compression Engine (ECE) present on Nuvoton NPCM SoCs.
> + The VCD can capture and differentiate video data from digital or
> + analog sources, then the ECE will compress the data into HEXTILE
> + format.
> diff --git a/drivers/media/platform/nuvoton/Makefile b/drivers/media/platform/nuvoton/Makefile
> new file mode 100644
> index 000000000000..74a4e3fc8555
> --- /dev/null
> +++ b/drivers/media/platform/nuvoton/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +obj-$(CONFIG_VIDEO_NPCM_VCD_ECE) += npcm-video.o
> diff --git a/drivers/media/platform/nuvoton/npcm-video.c b/drivers/media/platform/nuvoton/npcm-video.c
> new file mode 100644
> index 000000000000..12a82a06b9eb
> --- /dev/null
> +++ b/drivers/media/platform/nuvoton/npcm-video.c
> @@ -0,0 +1,2068 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for Video Capture/Differentiation Engine (VCD) and Encoding
> + * Compression Engine (ECE) present on Nuvoton NPCM SoCs.
> + *
> + * Copyright (C) 2022 Nuvoton Technologies
> + */
> +
> +#include <linux/atomic.h>
> +#include <linux/bitfield.h>
> +#include <linux/bitmap.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/interrupt.h>
> +#include <linux/jiffies.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +#include <linux/sched.h>
> +#include <linux/spinlock.h>
> +#include <linux/string.h>
> +#include <linux/v4l2-controls.h>
> +#include <linux/videodev2.h>
> +#include <linux/wait.h>
> +#include <linux/workqueue.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-dev.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-dv-timings.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <uapi/linux/npcm-video.h>
> +
> +#define DEVICE_NAME "npcm-video"
> +
> +#define MAX_FRAME_RATE 60
> +#define MAX_WIDTH 1920
> +#define MAX_HEIGHT 1200
> +#define MIN_WIDTH 320
> +#define MIN_HEIGHT 240
> +#define MIN_LP 512
> +#define MAX_LP 4096
> +#define RECT_W 16
> +#define RECT_H 16
> +#define BITMAP_SIZE 32
> +
> +#define VCD_MODULE_NAME "vcd"
> +#define ECE_MODULE_NAME "ece"
> +
> +/* VCD Registers */
> +#define VCD_DIFF_TBL 0x0000
> +#define VCD_FBA_ADR 0x8000
> +#define VCD_FBB_ADR 0x8004
> +
> +#define VCD_FB_LP 0x8008
> +#define VCD_FBA_LP GENMASK(15, 0)
> +#define VCD_FBB_LP GENMASK(31, 16)
> +
> +#define VCD_CAP_RES 0x800c
> +#define VCD_CAP_RES_VERT_RES GENMASK(10, 0)
> +#define VCD_CAP_RES_HOR_RES GENMASK(26, 16)
> +
> +#define VCD_MODE 0x8014
> +#define VCD_MODE_VCDE BIT(0)
> +#define VCD_MODE_CM565 BIT(1)
> +#define VCD_MODE_IDBC BIT(3)
> +#define VCD_MODE_COLOR_CNVRT GENMASK(5, 4)
> +#define VCD_MODE_COLOR_CNVRT_NO_CNVRT 0
> +#define VCD_MODE_COLOR_CNVRT_RGB_222 1
> +#define VCD_MODE_COLOR_CNVRT_666_MODE 2
> +#define VCD_MODE_COLOR_CNVRT_RGB_888 3
> +#define VCD_MODE_KVM_BW_SET BIT(16)
> +
> +#define VCD_CMD 0x8018
> +#define VCD_CMD_GO BIT(0)
> +#define VCD_CMD_RST BIT(1)
> +#define VCD_CMD_OPERATION GENMASK(6, 4)
> +#define VCD_CMD_OPERATION_CAPTURE 0
> +#define VCD_CMD_OPERATION_COMPARE 2
> +
> +#define VCD_STAT 0x801c
> +#define VCD_STAT_DONE BIT(0)
> +#define VCD_STAT_IFOT BIT(2)
> +#define VCD_STAT_IFOR BIT(3)
> +#define VCD_STAT_BUSY BIT(30)
> +#define VCD_STAT_CLEAR 0x3fff
> +
> +#define VCD_INTE 0x8020
> +#define VCD_INTE_DONE_IE BIT(0)
> +#define VCD_INTE_IFOT_IE BIT(2)
> +#define VCD_INTE_IFOR_IE BIT(3)
> +
> +#define VCD_RCHG 0x8028
> +#define VCD_RCHG_TIM_PRSCL GENMASK(12, 9)
> +
> +#define VCD_FIFO 0x805c
> +#define VCD_FIFO_TH 0x100350ff
> +
> +#define VCD_MAX_SRC_BUFFER_SIZE 0x500000 /* 1920 x 1200 x 2 bpp */
> +#define VCD_KVM_BW_PCLK 120000000UL
> +#define VCD_BUSY_TIMEOUT_US 300000
> +
> +/* ECE Registers */
> +#define ECE_DDA_CTRL 0x0000
> +#define ECE_DDA_CTRL_ECEEN BIT(0)
> +#define ECE_DDA_CTRL_INTEN BIT(8)
> +
> +#define ECE_DDA_STS 0x0004
> +#define ECE_DDA_STS_CDREADY BIT(8)
> +#define ECE_DDA_STS_ACDRDY BIT(10)
> +
> +#define ECE_FBR_BA 0x0008
> +#define ECE_ED_BA 0x000c
> +#define ECE_RECT_XY 0x0010
> +
> +#define ECE_RECT_DIMEN 0x0014
> +#define ECE_RECT_DIMEN_WR GENMASK(10, 0)
> +#define ECE_RECT_DIMEN_WLTR GENMASK(14, 11)
> +#define ECE_RECT_DIMEN_HR GENMASK(26, 16)
> +#define ECE_RECT_DIMEN_HLTR GENMASK(30, 27)
> +
> +#define ECE_RESOL 0x001c
> +#define ECE_RESOL_FB_LP_512 0
> +#define ECE_RESOL_FB_LP_1024 1
> +#define ECE_RESOL_FB_LP_2048 2
> +#define ECE_RESOL_FB_LP_2560 3
> +#define ECE_RESOL_FB_LP_4096 4
> +
> +#define ECE_HEX_CTRL 0x0040
> +#define ECE_HEX_CTRL_ENCDIS BIT(0)
> +#define ECE_HEX_CTRL_ENC_GAP GENMASK(12, 8)
> +
> +#define ECE_HEX_RECT_OFFSET 0x0048
> +#define ECE_HEX_RECT_OFFSET_MASK GENMASK(22, 0)
> +
> +#define ECE_TILE_W 16
> +#define ECE_TILE_H 16
> +#define ECE_POLL_TIMEOUT_US 300000
> +
> +/* GCR Registers */
> +#define INTCR 0x3c
> +#define INTCR_GFXIFDIS GENMASK(9, 8)
> +#define INTCR_DEHS BIT(27)
> +
> +#define INTCR2 0x60
> +#define INTCR2_GIRST2 BIT(2)
> +#define INTCR2_GIHCRST BIT(5)
> +#define INTCR2_GIVCRST BIT(6)
> +
> +#define INTCR3 0x9c
> +#define INTCR3_GMMAP GENMASK(10, 8)
> +#define INTCR3_GMMAP_128MB 0
> +#define INTCR3_GMMAP_256MB 1
> +#define INTCR3_GMMAP_512MB 2
> +#define INTCR3_GMMAP_1GB 3
> +#define INTCR3_GMMAP_2GB 4
> +
> +#define INTCR4 0xc0
> +#define INTCR4_GMMAP GENMASK(22, 16)
> +#define INTCR4_GMMAP_512MB 0x1f
> +#define INTCR4_GMMAP_512MB_ECC 0x1b
> +#define INTCR4_GMMAP_1GB 0x3f
> +#define INTCR4_GMMAP_1GB_ECC 0x37
> +#define INTCR4_GMMAP_2GB 0x7f
> +#define INTCR4_GMMAP_2GB_ECC 0x6f
> +
> +#define ADDR_GMMAP_128MB 0x07000000
> +#define ADDR_GMMAP_256MB 0x0f000000
> +#define ADDR_GMMAP_512MB 0x1f000000
> +#define ADDR_GMMAP_512MB_ECC 0x1b000000
> +#define ADDR_GMMAP_1GB 0x3f000000
> +#define ADDR_GMMAP_1GB_ECC 0x37000000
> +#define ADDR_GMMAP_2GB 0x7f000000
> +#define ADDR_GMMAP_2GB_ECC 0x6f000000
> +
> +#define GMMAP_LENGTH 0xc00000 /* Total 16MB, but 4MB preserved*/
> +
> +#define MFSEL1 0x0c
> +#define MFSEL1_DVH1SEL BIT(27)
> +
> +/* GFXI Register */
> +#define DISPST 0x00
> +#define DISPST_HSCROFF BIT(1)
> +#define DISPST_MGAMODE BIT(7)
> +
> +#define HVCNTL 0x10
> +#define HVCNTL_MASK GENMASK(7, 0)
> +
> +#define HVCNTH 0x14
> +#define HVCNTH_MASK GENMASK(2, 0)
> +
> +#define VVCNTL 0x20
> +#define VVCNTL_MASK GENMASK(7, 0)
> +
> +#define VVCNTH 0x24
> +#define VVCNTH_MASK GENMASK(2, 0)
> +
> +#define GPLLINDIV 0x40
> +#define GPLLINDIV_MASK GENMASK(5, 0)
> +#define GPLLINDIV_GPLLFBDV8 BIT(7)
> +
> +#define GPLLFBDIV 0x44
> +#define GPLLFBDIV_MASK GENMASK(7, 0)
> +
> +#define GPLLST 0x48
> +#define GPLLST_PLLOTDIV1 GENMASK(2, 0)
> +#define GPLLST_PLLOTDIV2 GENMASK(5, 3)
> +#define GPLLST_GPLLFBDV109 GENMASK(7, 6)
> +
There's a bunch of register definitions. Given you're adding a dedicated
directory for nuvoton maybe it makes sense to factor these definitions
out to a local header file?
> +struct npcm_video_addr {
> + size_t size;
> + dma_addr_t dma;
> + void *virt;
> +};
> +
> +struct npcm_video_buffer {
> + struct vb2_v4l2_buffer vb;
> + struct list_head link;
> +};
> +
> +#define to_npcm_video_buffer(x) \
> + container_of((x), struct npcm_video_buffer, vb)
> +
> +enum {
> + VIDEO_STREAMING,
> + VIDEO_FRAME_INPRG,
> + VIDEO_STOPPED,
> +};
> +
> +struct rect_list {
> + struct v4l2_clip clip;
> + struct list_head list;
> +};
> +
> +struct rect_list_info {
> + struct rect_list *list;
> + struct rect_list *first;
> + struct list_head *head;
> + unsigned int index;
> + unsigned int tile_perline;
> + unsigned int tile_perrow;
> + unsigned int offset_perline;
> + unsigned int tile_size;
> + unsigned int tile_cnt;
> +};
> +
> +struct npcm_ece {
> + struct regmap *regmap;
> + atomic_t clients;
> + struct reset_control *reset;
> +};
> +
> +struct npcm_video {
> + struct regmap *gcr_regmap;
> + struct regmap *gfx_regmap;
> + struct regmap *vcd_regmap;
> +
> + struct device *dev;
> + struct v4l2_ctrl_handler ctrl_handler;
> + struct v4l2_device v4l2_dev;
> + struct v4l2_pix_format pix_fmt;
> + struct v4l2_bt_timings active_timings;
> + struct v4l2_bt_timings detected_timings;
> + u32 v4l2_input_status;
> + struct vb2_queue queue;
> + struct video_device vdev;
> + struct mutex video_lock; /* v4l2 and videobuf2 lock */
> +
> + struct list_head buffers;
> + spinlock_t lock; /* buffer list lock */
> + unsigned long flags;
> + unsigned int sequence;
> +
> + size_t max_buffer_size;
> + struct npcm_video_addr src;
> + struct reset_control *reset;
> + struct npcm_ece ece;
> +
> + unsigned int frame_rate;
> + unsigned int vb_index;
> + u32 bytesperline;
> + u8 bytesperpixel;
> + u32 rect_cnt;
> + u8 num_buffers;
> + struct list_head *list;
> + u32 *rect;
> + int ctrl_cmd;
> + int op_cmd;
> +};
> +
> +#define to_npcm_video(x) container_of((x), struct npcm_video, v4l2_dev)
> +
> +static const struct v4l2_dv_timings_cap npcm_video_timings_cap = {
> + .type = V4L2_DV_BT_656_1120,
> + .bt = {
> + .min_width = MIN_WIDTH,
> + .max_width = MAX_WIDTH,
> + .min_height = MIN_HEIGHT,
> + .max_height = MAX_HEIGHT,
> + .min_pixelclock = 6574080, /* 640 x 480 x 24Hz */
> + .max_pixelclock = 138240000, /* 1920 x 1200 x 60Hz */
> + .standards = V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_DMT |
> + V4L2_DV_BT_STD_CVT | V4L2_DV_BT_STD_GTF,
> + .capabilities = V4L2_DV_BT_CAP_PROGRESSIVE |
> + V4L2_DV_BT_CAP_REDUCED_BLANKING |
> + V4L2_DV_BT_CAP_CUSTOM,
> + },
> +};
> +
> +static DECLARE_BITMAP(bitmap, BITMAP_SIZE);
> +
> +static void npcm_video_ece_prepend_rect_header(u8 *addr, u16 x, u16 y, u16 w,
> + u16 h)
> +{
> + __be16 x_pos = cpu_to_be16(x);
> + __be16 y_pos = cpu_to_be16(y);
> + __be16 width = cpu_to_be16(w);
> + __be16 height = cpu_to_be16(h);
> + __be32 encoding = cpu_to_be32(5); /* Hextile encoding */
> +
> + memcpy(addr, &x_pos, 2);
> + memcpy(addr + 2, &y_pos, 2);
> + memcpy(addr + 4, &width, 2);
> + memcpy(addr + 6, &height, 2);
> + memcpy(addr + 8, &encoding, 4);
> +}
> +
> +static unsigned int npcm_video_ece_get_ed_size(struct npcm_video *video,
> + u32 offset, u8 *addr)
> +{
> + struct regmap *ece = video->ece.regmap;
> + u32 size, gap, val;
> + int ret;
> +
> + ret = regmap_read_poll_timeout(ece, ECE_DDA_STS, val,
> + (val & ECE_DDA_STS_CDREADY),
> + 0, ECE_POLL_TIMEOUT_US);
> +
> + if (ret) {
> + dev_warn(video->dev, "Wait for ECE_DDA_STS_CDREADY timeout\n");
> + return 0;
> + }
> +
> + size = readl(addr + offset);
> +
> + regmap_read(ece, ECE_HEX_CTRL, &val);
> + gap = FIELD_GET(ECE_HEX_CTRL_ENC_GAP, val);
> +
> + dev_dbg(video->dev, "offset = %u, ed_size = %u, gap = %u\n", offset,
> + size, gap);
> +
> + return size + gap;
> +}
> +
> +static void npcm_video_ece_enc_rect(struct npcm_video *video, u32 r_off_x,
> + u32 r_off_y, u32 r_w, u32 r_h)
> +{
> + struct regmap *ece = video->ece.regmap;
> + u32 rect_offset = (r_off_y * video->bytesperline) + (r_off_x * 2);
> + u32 temp;
> + u32 w_tile;
> + u32 h_tile;
> + u32 w_size = ECE_TILE_W;
> + u32 h_size = ECE_TILE_H;
> +
> + regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, 0);
> + regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN,
> + ECE_DDA_CTRL_ECEEN);
> + regmap_write(ece, ECE_DDA_STS, ECE_DDA_STS_CDREADY |
> + ECE_DDA_STS_ACDRDY);
> + regmap_write(ece, ECE_RECT_XY, rect_offset);
> +
> + w_tile = r_w / ECE_TILE_W;
> + h_tile = r_h / ECE_TILE_H;
> +
> + if (r_w % ECE_TILE_W) {
> + w_tile += 1;
> + w_size = r_w % ECE_TILE_W;
> + }
> +
> + if (r_h % ECE_TILE_H || !h_tile) {
> + h_tile += 1;
> + h_size = r_h % ECE_TILE_H;
> + }
> +
> + temp = FIELD_PREP(ECE_RECT_DIMEN_WLTR, w_size - 1) |
> + FIELD_PREP(ECE_RECT_DIMEN_HLTR, h_size - 1) |
> + FIELD_PREP(ECE_RECT_DIMEN_WR, w_tile - 1) |
> + FIELD_PREP(ECE_RECT_DIMEN_HR, h_tile - 1);
> +
> + regmap_write(ece, ECE_RECT_DIMEN, temp);
> +}
> +
> +static u32 npcm_video_ece_read_rect_offset(struct npcm_video *video)
> +{
> + struct regmap *ece = video->ece.regmap;
> + u32 offset;
> +
> + regmap_read(ece, ECE_HEX_RECT_OFFSET, &offset);
> + return FIELD_GET(ECE_HEX_RECT_OFFSET_MASK, offset);
> +}
> +
> +/*
> + * Set the line pitch (in bytes) for the frame buffers.
> + * Can be on of those values: 512, 1024, 2048, 2560 or 4096 bytes.
> + */
> +static void npcm_video_ece_set_lp(struct npcm_video *video, u32 pitch)
> +{
> + u32 lp;
> + struct regmap *ece = video->ece.regmap;
> +
> + switch (pitch) {
> + case 512:
> + lp = ECE_RESOL_FB_LP_512;
> + break;
> + case 1024:
> + lp = ECE_RESOL_FB_LP_1024;
> + break;
> + case 2048:
> + lp = ECE_RESOL_FB_LP_2048;
> + break;
> + case 2560:
> + lp = ECE_RESOL_FB_LP_2560;
> + break;
> + case 4096:
> + lp = ECE_RESOL_FB_LP_4096;
> + break;
> + default:
> + return;
> + }
> +
> + regmap_write(ece, ECE_RESOL, lp);
> +}
> +
> +static void npcm_video_ece_set_fb_addr(struct npcm_video *video, u32 buffer)
> +{
> + struct regmap *ece = video->ece.regmap;
> +
> + regmap_write(ece, ECE_FBR_BA, buffer);
> +}
> +
> +static void npcm_video_ece_set_enc_dba(struct npcm_video *video, u32 addr)
> +{
> + struct regmap *ece = video->ece.regmap;
> +
> + regmap_write(ece, ECE_ED_BA, addr);
> +}
> +
> +static void npcm_video_ece_clear_rect_offset(struct npcm_video *video)
> +{
> + struct regmap *ece = video->ece.regmap;
> +
> + regmap_write(ece, ECE_HEX_RECT_OFFSET, 0);
> +}
> +
> +static void npcm_video_ece_ctrl_reset(struct npcm_video *video)
> +{
> + struct regmap *ece = video->ece.regmap;
> +
> + regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, 0);
> + regmap_update_bits(ece, ECE_HEX_CTRL, ECE_HEX_CTRL_ENCDIS,
> + ECE_HEX_CTRL_ENCDIS);
> + regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN,
> + ECE_DDA_CTRL_ECEEN);
> + regmap_update_bits(ece, ECE_HEX_CTRL, ECE_HEX_CTRL_ENCDIS, 0);
> +
> + npcm_video_ece_clear_rect_offset(video);
> +}
> +
> +static void npcm_video_ece_ip_reset(struct npcm_video *video)
> +{
> + /*
> + * After resetting a module and clearing the reset bit, it should wait
> + * at least 10 us before accessing the module.
> + */
> + reset_control_assert(video->ece.reset);
> + usleep_range(10, 20);
> + reset_control_deassert(video->ece.reset);
> + usleep_range(10, 20);
> +}
> +
> +static int npcm_video_ece_init(struct npcm_video *video)
> +{
> + npcm_video_ece_ip_reset(video);
> + npcm_video_ece_ctrl_reset(video);
> +
> + return 0;
> +}
> +
> +static int npcm_video_ece_stop(struct npcm_video *video)
> +{
> + struct regmap *ece = video->ece.regmap;
> +
> + regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, 0);
> + regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_INTEN, 0);
> + regmap_update_bits(ece, ECE_HEX_CTRL, ECE_HEX_CTRL_ENCDIS,
> + ECE_HEX_CTRL_ENCDIS);
> + npcm_video_ece_clear_rect_offset(video);
> +
> + return 0;
> +}
> +
> +static bool npcm_video_alloc_buf(struct npcm_video *video,
> + struct npcm_video_addr *addr, size_t size)
> +{
> + if (size > VCD_MAX_SRC_BUFFER_SIZE)
> + size = VCD_MAX_SRC_BUFFER_SIZE;
> +
> + addr->virt = dma_alloc_coherent(video->dev, size, &addr->dma,
> + GFP_KERNEL);
> +
> + if (!addr->virt)
> + return false;
> +
> + addr->size = size;
> + return true;
> +}
> +
> +static void npcm_video_free_buf(struct npcm_video *video,
> + struct npcm_video_addr *addr)
> +{
> + dma_free_coherent(video->dev, addr->size, addr->virt, addr->dma);
> + addr->size = 0;
> + addr->dma = 0ULL;
> + addr->virt = NULL;
> +}
> +
> +static void npcm_video_free_diff_table(struct npcm_video *video)
> +{
> + struct list_head *head, *pos, *nx;
> + struct rect_list *tmp;
> + unsigned int i;
> +
> + for (i = 0; i < video->num_buffers; i++) {
> + head = &video->list[i];
> + list_for_each_safe(pos, nx, head) {
> + tmp = list_entry(pos, struct rect_list, list);
If we ever get here isn't pos guaranteed to be non-NULL?
And so consequently is tmp.
> + if (tmp) {
Then this condition is always true?
> + list_del(&tmp->list);
> + kfree(tmp);
> + }
> + }
> + }
> +}
> +
> +static int npcm_video_add_rect(struct npcm_video *video, unsigned int index,
> + u32 x, u32 y, u32 w, u32 h)
> +{
> + struct list_head *head = &video->list[index];
> + struct rect_list *list = NULL;
> + struct v4l2_rect *r;
> +
> + list = kzalloc(sizeof(*list), GFP_KERNEL);
> + if (!list)
> + return 0;
> +
> + r = &list->clip.c;
> + r->left = x;
> + r->top = y;
> + r->width = w;
> + r->height = h;
> +
> + list_add_tail(&list->list, head);
> + return 1;
> +}
> +
> +static void npcm_video_merge_rect(struct npcm_video *video,
> + struct rect_list_info *info)
> +{
> + struct list_head *head = info->head;
> + struct rect_list *list = info->list;
> + struct rect_list *first = info->first;
> + struct v4l2_rect *r = &list->clip.c;
> + struct v4l2_rect *f = &first->clip.c;
> +
> + if (!first) {
> + first = list;
> + info->first = first;
> + list_add_tail(&list->list, head);
> + video->rect_cnt++;
> + } else {
> + if ((r->left == (f->left + f->width)) && r->top == f->top) {
> + f->width += r->width;
> + kfree(list);
> + } else if ((r->top == (f->top + f->height)) &&
> + (r->left == f->left)) {
> + f->height += r->height;
> + kfree(list);
> + } else if (((r->top > f->top) &&
> + (r->top < (f->top + f->height))) &&
> + ((r->left > f->left) &&
> + (r->left < (f->left + f->width)))) {
> + kfree(list);
> + } else {
> + list_add_tail(&list->list, head);
> + video->rect_cnt++;
> + info->first = list;
> + }
> + }
> +}
> +
> +static struct rect_list *npcm_video_new_rect(struct npcm_video *video,
> + unsigned int offset,
> + unsigned int index)
> +{
> + struct v4l2_bt_timings *act = &video->active_timings;
> + struct rect_list *list = NULL;
> + struct v4l2_rect *r;
> +
> + list = kzalloc(sizeof(*list), GFP_KERNEL);
> + if (!list)
> + return NULL;
> +
> + r = &list->clip.c;
> +
> + r->left = (offset << 4);
> + r->top = (index >> 2);
> + r->width = RECT_W;
> + r->height = RECT_H;
> + if ((r->left + RECT_W) > act->width)
> + r->width = act->width - r->left;
> + if ((r->top + RECT_H) > act->height)
> + r->height = act->height - r->top;
> +
> + return list;
> +}
> +
> +static int npcm_video_find_rect(struct npcm_video *video,
> + struct rect_list_info *info,
> + unsigned int offset)
> +{
> + if (offset < info->tile_perline) {
> + info->list = npcm_video_new_rect(video, offset, info->index);
> + if (!info->list)
> + return -ENOMEM;
> +
> + npcm_video_merge_rect(video, info);
> + }
> + return 0;
> +}
> +
> +static int npcm_video_build_table(struct npcm_video *video,
> + struct rect_list_info *info)
> +{
> + int ret;
> + unsigned int j, bit;
> + u32 value;
> + struct regmap *vcd = video->vcd_regmap;
> +
> + for (j = 0; j < info->offset_perline; j += 4) {
> + regmap_read(vcd, VCD_DIFF_TBL + (j + info->index), &value);
> +
> + bitmap_from_arr32(bitmap, &value, BITMAP_SIZE);
> +
> + for_each_set_bit(bit, bitmap, BITMAP_SIZE) {
> + ret = npcm_video_find_rect(video, info, bit + (j << 3));
> + if (ret < 0)
> + return ret;
> + }
> + }
> + info->index += 64;
> + return info->tile_perline;
> +}
> +
> +static int npcm_video_get_rect_list(struct npcm_video *video,
> + unsigned int index)
> +{
> + struct v4l2_bt_timings *act = &video->active_timings;
> + struct rect_list_info info;
> + int ret = 0;
> + unsigned int mod, tile_cnt = 0;
> +
> + memset(&info, 0, sizeof(struct rect_list_info));
> + info.head = &video->list[index];
> +
> + info.tile_perline = act->width >> 4;
> + mod = act->width % RECT_W;
> + if (mod != 0)
> + info.tile_perline += 1;
> +
> + info.tile_perrow = act->height >> 4;
> + mod = act->height % RECT_H;
> + if (mod != 0)
> + info.tile_perrow += 1;
> +
> + info.tile_size = info.tile_perrow * info.tile_perline;
> +
> + info.offset_perline = info.tile_perline >> 5;
> + mod = info.tile_perline % 32;
> + if (mod != 0)
> + info.offset_perline += 1;
> +
> + info.offset_perline *= 4;
> +
> + do {
> + ret = npcm_video_build_table(video, &info);
> + if (ret < 0)
> + return ret;
> + tile_cnt += ret;
> + } while (tile_cnt < info.tile_size);
> +
> + return ret;
> +}
> +
> +static unsigned int npcm_video_get_rect_count(struct npcm_video *video)
> +{
> + struct list_head *head, *pos, *nx;
> + struct rect_list *tmp;
> + unsigned int count;
> +
> + if (video->list && video->rect) {
> + count = video->rect[video->vb_index];
> +
> + head = &video->list[video->vb_index];
> + list_for_each_safe(pos, nx, head) {
> + tmp = list_entry(pos, struct rect_list, list);
ditto
> + if (tmp) {
> + list_del(&tmp->list);
> + kfree(tmp);
> + }
> + }
> + }
> +
> + return count;
> +}
> +
> +static u8 npcm_video_is_mga(struct npcm_video *video)
> +{
> + struct regmap *gfxi = video->gfx_regmap;
> + u32 dispst;
> +
> + regmap_read(gfxi, DISPST, &dispst);
> + return ((dispst & DISPST_MGAMODE) == DISPST_MGAMODE);
> +}
> +
> +static u32 npcm_video_hres(struct npcm_video *video)
> +{
> + struct regmap *gfxi = video->gfx_regmap;
> + u32 hvcnth, hvcntl, apb_hor_res;
> +
> + regmap_read(gfxi, HVCNTH, &hvcnth);
> + regmap_read(gfxi, HVCNTL, &hvcntl);
> + apb_hor_res = (((hvcnth & HVCNTH_MASK) << 8) +
> + (hvcntl & HVCNTL_MASK) + 1);
> +
> + return apb_hor_res;
> +}
> +
> +static u32 npcm_video_vres(struct npcm_video *video)
> +{
> + struct regmap *gfxi = video->gfx_regmap;
> + u32 vvcnth, vvcntl, apb_ver_res;
> +
> + regmap_read(gfxi, VVCNTH, &vvcnth);
> + regmap_read(gfxi, VVCNTL, &vvcntl);
> +
> + apb_ver_res = (((vvcnth & VVCNTH_MASK) << 8) + (vvcntl & VVCNTL_MASK));
> +
> + return apb_ver_res;
> +}
> +
> +static int npcm_video_capres(struct npcm_video *video, u32 hor_res,
> + u32 vert_res)
> +{
> + struct regmap *vcd = video->vcd_regmap;
> + u32 res, cap_res;
> +
> + if (hor_res > MAX_WIDTH || vert_res > MAX_HEIGHT)
> + return -EINVAL;
> +
> + res = FIELD_PREP(VCD_CAP_RES_VERT_RES, vert_res) |
> + FIELD_PREP(VCD_CAP_RES_HOR_RES, hor_res);
> +
> + regmap_write(vcd, VCD_CAP_RES, res);
> + regmap_read(vcd, VCD_CAP_RES, &cap_res);
> +
> + if (cap_res != res)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static void npcm_video_vcd_ip_reset(struct npcm_video *video)
> +{
> + /*
> + * After resetting a module and clearing the reset bit, it should wait
> + * at least 10 us before accessing the module.
> + */
> + reset_control_assert(video->reset);
> + usleep_range(10, 20);
> + reset_control_deassert(video->reset);
> + usleep_range(10, 20);
> +}
> +
> +static void npcm_video_vcd_state_machine_reset(struct npcm_video *video)
> +{
> + struct regmap *vcd = video->vcd_regmap;
> + u32 stat;
> + int ret;
> +
> + regmap_update_bits(vcd, VCD_MODE, VCD_MODE_VCDE, 0);
> +
> + regmap_update_bits(vcd, VCD_MODE, VCD_MODE_IDBC, 0);
> +
> + regmap_update_bits(vcd, VCD_CMD, VCD_CMD_RST, VCD_CMD_RST);
> +
> + ret = regmap_read_poll_timeout(vcd, VCD_STAT, stat,
> + (stat & VCD_STAT_DONE), 0,
> + ECE_POLL_TIMEOUT_US);
> +
> + if (ret) {
> + dev_warn(video->dev, "Wait for VCD_STAT_DONE timeout\n");
> + return;
> + }
> +
> + regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
> +
> + regmap_update_bits(vcd, VCD_MODE, VCD_MODE_VCDE, VCD_MODE_VCDE);
> +
> + regmap_update_bits(vcd, VCD_MODE, VCD_MODE_IDBC, VCD_MODE_IDBC);
> +}
> +
> +static int npcm_video_gfx_reset(struct npcm_video *video)
> +{
> + struct regmap *gcr = video->gcr_regmap;
> +
> + regmap_update_bits(gcr, INTCR2, INTCR2_GIRST2, INTCR2_GIRST2);
> +
> + npcm_video_vcd_state_machine_reset(video);
> +
> + regmap_update_bits(gcr, INTCR2, INTCR2_GIRST2, 0);
> +
> + return 0;
> +}
> +
> +static void npcm_video_kvm_bw(struct npcm_video *video, u8 bandwidth)
> +{
> + struct regmap *vcd = video->vcd_regmap;
> +
> + if (!npcm_video_is_mga(video))
> + bandwidth = 1;
> +
> + if (bandwidth)
> + regmap_update_bits(vcd, VCD_MODE, VCD_MODE_KVM_BW_SET,
> + VCD_MODE_KVM_BW_SET);
> + else
> + regmap_update_bits(vcd, VCD_MODE, VCD_MODE_KVM_BW_SET, 0);
> +}
> +
> +static u32 npcm_video_pclk(struct npcm_video *video)
> +{
> + struct regmap *gfxi = video->gfx_regmap;
> + u32 tmp, pllfbdiv, pllinotdiv, gpllfbdiv;
> + u8 gpllfbdv109, gpllfbdv8, gpllindiv;
> + u8 gpllst_pllotdiv1, gpllst_pllotdiv2;
> +
> + regmap_read(gfxi, GPLLST, &tmp);
> + gpllfbdv109 = FIELD_GET(GPLLST_GPLLFBDV109, tmp);
> + gpllst_pllotdiv1 = FIELD_GET(GPLLST_PLLOTDIV1, tmp);
> + gpllst_pllotdiv2 = FIELD_GET(GPLLST_PLLOTDIV2, tmp);
> +
> + regmap_read(gfxi, GPLLINDIV, &tmp);
> + gpllfbdv8 = FIELD_GET(GPLLINDIV_GPLLFBDV8, tmp);
> + gpllindiv = FIELD_GET(GPLLINDIV_MASK, tmp);
> +
> + regmap_read(gfxi, GPLLFBDIV, &tmp);
> + gpllfbdiv = FIELD_GET(GPLLFBDIV_MASK, tmp);
> +
> + pllfbdiv = (512 * gpllfbdv109 + 256 * gpllfbdv8 + gpllfbdiv);
> + pllinotdiv = (gpllindiv * gpllst_pllotdiv1 * gpllst_pllotdiv2);
> + if (pllfbdiv == 0 || pllinotdiv == 0)
> + return 0;
> +
> + return ((pllfbdiv * 25000) / pllinotdiv) * 1000;
> +}
> +
> +static int npcm_video_get_bpp(struct npcm_video *video)
> +{
> + struct regmap *vcd = video->vcd_regmap;
> + u32 mode, color_cnvr;
> +
> + regmap_read(vcd, VCD_MODE, &mode);
> +
> + color_cnvr = FIELD_GET(VCD_MODE_COLOR_CNVRT, mode);
> +
> + switch (color_cnvr) {
> + case VCD_MODE_COLOR_CNVRT_NO_CNVRT:
> + return 2;
> + case VCD_MODE_COLOR_CNVRT_RGB_222:
> + case VCD_MODE_COLOR_CNVRT_666_MODE:
> + return 1;
> + case VCD_MODE_COLOR_CNVRT_RGB_888:
> + return 4;
> + }
> + return 0;
> +}
> +
> +/*
> + * Pitch must be a power of 2, >= linebytes,
> + * at least 512, and no more than 4096.
> + */
> +static void npcm_video_set_linepitch(struct npcm_video *video, u32 linebytes)
> +{
> + struct regmap *vcd = video->vcd_regmap;
> + u32 pitch = MIN_LP;
> +
> + while ((pitch < linebytes) && (pitch < MAX_LP))
> + pitch *= 2;
> +
> + regmap_write(vcd, VCD_FB_LP, FIELD_PREP(VCD_FBA_LP, pitch) |
> + FIELD_PREP(VCD_FBB_LP, pitch));
> +}
> +
> +static u32 npcm_video_get_linepitch(struct npcm_video *video)
> +{
> + struct regmap *vcd = video->vcd_regmap;
> + u32 linepitch;
> +
> + regmap_read(vcd, VCD_FB_LP, &linepitch);
> +
> + return FIELD_GET(VCD_FBA_LP, linepitch);
> +}
> +
> +static int npcm_video_command(struct npcm_video *video, u32 value)
> +{
> + struct regmap *vcd = video->vcd_regmap;
> + u32 cmd;
> +
> + regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
> +
> + regmap_read(vcd, VCD_CMD, &cmd);
> + cmd |= FIELD_PREP(VCD_CMD_OPERATION, value);
> +
> + regmap_write(vcd, VCD_CMD, cmd);
> + regmap_update_bits(vcd, VCD_CMD, VCD_CMD_GO, VCD_CMD_GO);
> + video->op_cmd = value;
> +
> + return 0;
> +}
> +
> +static int npcm_video_init_reg(struct npcm_video *video)
> +{
> + struct regmap *gcr = video->gcr_regmap;
> + struct regmap *vcd = video->vcd_regmap;
> +
> + /* Selects Data Enable */
> + regmap_update_bits(gcr, INTCR, INTCR_DEHS, 0);
> +
> + /* Enable display of KVM GFX and access to memory */
> + regmap_update_bits(gcr, INTCR, INTCR_GFXIFDIS, 0);
> +
> + /* Active Vertical/Horizontal Counters Reset */
> + regmap_update_bits(gcr, INTCR2, INTCR2_GIHCRST | INTCR2_GIVCRST,
> + INTCR2_GIHCRST | INTCR2_GIVCRST);
> +
> + /* Select KVM GFX input */
> + regmap_update_bits(gcr, MFSEL1, MFSEL1_DVH1SEL, 0);
> +
> + /* Reset video modules */
> + npcm_video_vcd_ip_reset(video);
> + npcm_video_gfx_reset(video);
> +
> + /* Set the FIFO thresholds */
> + regmap_write(vcd, VCD_FIFO, VCD_FIFO_TH);
> +
> + /* Set video mode */
> + regmap_update_bits(vcd, VCD_MODE, 0xffffffff,
> + VCD_MODE_VCDE | VCD_MODE_CM565 |
> + VCD_MODE_IDBC | VCD_MODE_KVM_BW_SET);
> +
> + regmap_write(vcd, VCD_RCHG, FIELD_PREP(VCD_RCHG_TIM_PRSCL, 0xf));
> +
> + return 0;
> +}
> +
> +static int npcm_video_start_frame(struct npcm_video *video)
> +{
> + unsigned long flags;
> + struct npcm_video_buffer *buf;
> + struct regmap *vcd = video->vcd_regmap;
> + u32 val;
> + int ret;
> +
> + if (video->v4l2_input_status) {
> + dev_dbg(video->dev, "No video signal; skip capture frame\n");
> + return 0;
> + }
> +
> + ret = regmap_read_poll_timeout(vcd, VCD_STAT, val,
> + !(val & VCD_STAT_BUSY), 1000,
> + VCD_BUSY_TIMEOUT_US);
> +
> + if (ret) {
> + dev_err(video->dev, "Wait for VCD_STAT_BUSY timeout\n");
> + return -EBUSY;
> + }
> +
> + spin_lock_irqsave(&video->lock, flags);
> + buf = list_first_entry_or_null(&video->buffers,
> + struct npcm_video_buffer, link);
> + if (!buf) {
> + spin_unlock_irqrestore(&video->lock, flags);
> + dev_dbg(video->dev, "No empty buffers; skip capture frame\n");
> + return 0;
> + }
> +
> + set_bit(VIDEO_FRAME_INPRG, &video->flags);
> + spin_unlock_irqrestore(&video->lock, flags);
> +
> + npcm_video_vcd_state_machine_reset(video);
> +
> + regmap_update_bits(vcd, VCD_INTE, VCD_INTE_DONE_IE | VCD_INTE_IFOT_IE |
> + VCD_INTE_IFOR_IE, VCD_INTE_DONE_IE |
> + VCD_INTE_IFOT_IE | VCD_INTE_IFOR_IE);
> +
> + npcm_video_command(video, video->ctrl_cmd);
> +
> + return 0;
> +}
> +
> +static void npcm_video_bufs_done(struct npcm_video *video,
> + enum vb2_buffer_state state)
> +{
> + unsigned long flags;
> + struct npcm_video_buffer *buf;
> +
> + spin_lock_irqsave(&video->lock, flags);
> + list_for_each_entry(buf, &video->buffers, link)
> + vb2_buffer_done(&buf->vb.vb2_buf, state);
> + INIT_LIST_HEAD(&video->buffers);
> + spin_unlock_irqrestore(&video->lock, flags);
> +}
> +
> +static void npcm_video_get_diff_rect(struct npcm_video *video,
> + unsigned int index)
> +{
> + u32 width = video->active_timings.width;
> + u32 height = video->active_timings.height;
> +
> + if (video->op_cmd != VCD_CMD_OPERATION_CAPTURE) {
> + video->rect_cnt = 0;
> + npcm_video_get_rect_list(video, index);
> + video->rect[index] = video->rect_cnt;
> + } else {
> + video->rect[index] = npcm_video_add_rect(video, index, 0, 0,
> + width, height);
> + }
> +}
> +
> +static irqreturn_t npcm_video_irq(int irq, void *arg)
> +{
> + struct npcm_video *video = arg;
> + struct regmap *vcd = video->vcd_regmap;
> + struct npcm_video_buffer *buf;
> + struct rect_list *rect_list;
> + struct v4l2_rect *rect;
> + u32 status, ed_offset;
> + void *addr;
> + dma_addr_t vb_dma_addr;
> + unsigned int index, ed_size, total_size;
> +
> + regmap_read(vcd, VCD_STAT, &status);
> + dev_dbg(video->dev, "VCD irq status 0x%x\n", status);
> +
> + regmap_write(vcd, VCD_INTE, 0);
> + regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
> +
> + if (test_bit(VIDEO_STOPPED, &video->flags) ||
> + !test_bit(VIDEO_STREAMING, &video->flags)) {
> + clear_bit(VIDEO_FRAME_INPRG, &video->flags);
> + return IRQ_NONE;
> + }
> +
> + if (status & VCD_STAT_DONE) {
> + spin_lock(&video->lock);
> + buf = list_first_entry_or_null(&video->buffers,
> + struct npcm_video_buffer,
> + link);
> +
> + if (!buf) {
> + spin_unlock(&video->lock);
> + clear_bit(VIDEO_FRAME_INPRG, &video->flags);
> + return IRQ_NONE;
> + }
> +
> + addr = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
> + vb_dma_addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
> + index = buf->vb.vb2_buf.index;
> +
> + npcm_video_ece_ctrl_reset(video);
> + npcm_video_ece_clear_rect_offset(video);
> +
> + npcm_video_ece_set_fb_addr(video, video->src.dma);
> +
> + /* Set base address of encoded data to video buffer */
> + npcm_video_ece_set_enc_dba(video, vb_dma_addr);
> +
> + npcm_video_ece_set_lp(video, video->bytesperline);
> + npcm_video_get_diff_rect(video, index);
> +
> + total_size = 0;
> +
> + list_for_each_entry(rect_list, &video->list[index], list) {
> + rect = &rect_list->clip.c;
> + ed_offset = npcm_video_ece_read_rect_offset(video);
> +
> + npcm_video_ece_enc_rect(video, rect->left,
> + rect->top, rect->width,
> + rect->height);
> + ed_size = npcm_video_ece_get_ed_size(video,
> + ed_offset,
> + addr);
> +
> + npcm_video_ece_prepend_rect_header(addr + ed_offset,
> + rect->left,
> + rect->top,
> + rect->width,
> + rect->height);
> +
> + total_size += ed_size;
> + }
> +
> + vb2_set_plane_payload(&buf->vb.vb2_buf, 0, total_size);
> + buf->vb.vb2_buf.timestamp = ktime_get_ns();
> + buf->vb.sequence = video->sequence++;
> + buf->vb.field = V4L2_FIELD_NONE;
> + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
> + list_del(&buf->link);
> +
> + spin_unlock(&video->lock);
> +
> + clear_bit(VIDEO_FRAME_INPRG, &video->flags);
> + }
> +
> + if (status & VCD_STAT_IFOR || status & VCD_STAT_IFOT) {
> + dev_warn(video->dev, "VCD FIFO overrun or over thresholds\n");
> + npcm_video_vcd_ip_reset(video);
> + npcm_video_gfx_reset(video);
> + npcm_video_start_frame(video);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void npcm_video_clear_gmmap(struct npcm_video *video)
> +{
> + struct regmap *gcr = video->gcr_regmap;
> + u32 intcr, gmmap;
> + void __iomem *baseptr;
> +
> + if (of_device_is_compatible(video->dev->of_node, "nuvoton,npcm750-video")) {
> + regmap_read(gcr, INTCR3, &intcr);
> + gmmap = FIELD_GET(INTCR3_GMMAP, intcr);
> +
> + switch (gmmap) {
> + case INTCR3_GMMAP_128MB:
> + baseptr = ioremap_wc(ADDR_GMMAP_128MB, GMMAP_LENGTH);
> + break;
> + case INTCR3_GMMAP_256MB:
> + baseptr = ioremap_wc(ADDR_GMMAP_256MB, GMMAP_LENGTH);
> + break;
> + case INTCR3_GMMAP_512MB:
> + baseptr = ioremap_wc(ADDR_GMMAP_512MB, GMMAP_LENGTH);
> + break;
> + case INTCR3_GMMAP_1GB:
> + baseptr = ioremap_wc(ADDR_GMMAP_1GB, GMMAP_LENGTH);
> + break;
> + case INTCR3_GMMAP_2GB:
> + baseptr = ioremap_wc(ADDR_GMMAP_2GB, GMMAP_LENGTH);
> + break;
> + }
> + } else if (of_device_is_compatible(video->dev->of_node, "nuvoton,npcm845-video")) {
> + regmap_read(gcr, INTCR4, &intcr);
> + gmmap = FIELD_GET(INTCR4_GMMAP, intcr);
> +
> + switch (gmmap) {
> + case INTCR4_GMMAP_512MB:
> + baseptr = ioremap_wc(ADDR_GMMAP_512MB, GMMAP_LENGTH);
> + break;
> + case INTCR4_GMMAP_512MB_ECC:
> + baseptr = ioremap_wc(ADDR_GMMAP_512MB_ECC, GMMAP_LENGTH);
> + break;
> + case INTCR4_GMMAP_1GB:
> + baseptr = ioremap_wc(ADDR_GMMAP_1GB, GMMAP_LENGTH);
> + break;
> + case INTCR4_GMMAP_1GB_ECC:
> + baseptr = ioremap_wc(ADDR_GMMAP_1GB_ECC, GMMAP_LENGTH);
> + break;
> + case INTCR4_GMMAP_2GB:
> + baseptr = ioremap_wc(ADDR_GMMAP_2GB, GMMAP_LENGTH);
> + break;
> + case INTCR4_GMMAP_2GB_ECC:
> + baseptr = ioremap_wc(ADDR_GMMAP_2GB_ECC, GMMAP_LENGTH);
> + break;
> + }
> + }
> +
> + memset(baseptr, 0, GMMAP_LENGTH);
> + iounmap(baseptr);
> +}
> +
> +static void npcm_video_get_resolution(struct npcm_video *video)
> +{
> + struct v4l2_bt_timings *act = &video->active_timings;
> + struct v4l2_bt_timings *det = &video->detected_timings;
> + struct regmap *gfxi;
> + u32 dispst;
> +
> + video->v4l2_input_status = 0;
> +
> + det->width = npcm_video_hres(video);
> + det->height = npcm_video_vres(video);
> +
> + if (act->width != det->width || act->height != det->height) {
> + dev_dbg(video->dev, "Resolution changed\n");
> +
> + npcm_video_bufs_done(video, VB2_BUF_STATE_ERROR);
> +
> + if (npcm_video_hres(video) > 0 && npcm_video_vres(video) > 0) {
> + gfxi = video->gfx_regmap;
> +
> + if (test_bit(VIDEO_STREAMING, &video->flags)) {
> + /*
> + * Wait for resolution is available,
> + * and it is also captured by host.
> + */
> + do {
> + mdelay(100);
> + regmap_read(gfxi, DISPST, &dispst);
> + } while (npcm_video_vres(video) < 100 ||
> + npcm_video_pclk(video) == 0 ||
> + (dispst & DISPST_HSCROFF));
> + }
> +
> + det->width = npcm_video_hres(video);
> + det->height = npcm_video_vres(video);
> + det->pixelclock = npcm_video_pclk(video);
> + }
> + }
> +
> + if (det->width == 0 || det->height == 0) {
> + det->width = MIN_WIDTH;
> + det->height = MIN_HEIGHT;
> + npcm_video_clear_gmmap(video);
> + video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
> + }
> +
> + dev_dbg(video->dev, "Got resolution[%dx%d] -> [%dx%d], status %d\n",
> + act->width, act->height, det->width, det->height,
> + video->v4l2_input_status);
> +}
> +
> +static void npcm_video_set_resolution(struct npcm_video *video)
> +{
> + struct v4l2_bt_timings *act = &video->active_timings;
> + struct regmap *vcd = video->vcd_regmap;
> + u32 mode;
> +
> + /* Set video frame physical address */
> + regmap_write(vcd, VCD_FBA_ADR, video->src.dma);
> + regmap_write(vcd, VCD_FBB_ADR, video->src.dma);
> +
> + npcm_video_capres(video, act->width, act->height);
> +
> + video->bytesperpixel = npcm_video_get_bpp(video);
> + npcm_video_set_linepitch(video, act->width * video->bytesperpixel);
> +
> + video->bytesperline = npcm_video_get_linepitch(video);
> +
> + npcm_video_kvm_bw(video, act->pixelclock > VCD_KVM_BW_PCLK);
> +
> + npcm_video_gfx_reset(video);
> +
> + regmap_read(vcd, VCD_MODE, &mode);
> +
> + clear_bit(VIDEO_FRAME_INPRG, &video->flags);
> +
> + dev_dbg(video->dev, "VCD mode = 0x%x, %s mode\n", mode,
> + npcm_video_is_mga(video) ? "Hi Res" : "VGA");
> +
> + dev_dbg(video->dev,
> + "Digital mode: %d x %d x %d, pixelclock %lld, bytesperline %d\n",
> + act->width, act->height, video->bytesperpixel, act->pixelclock,
> + video->bytesperline);
> +}
> +
> +static int npcm_video_start(struct npcm_video *video)
> +{
> + int rc;
> +
> + rc = npcm_video_init_reg(video);
> + if (rc)
> + return rc;
> +
> + npcm_video_get_resolution(video);
> +
> + video->active_timings = video->detected_timings;
> +
> + video->max_buffer_size = VCD_MAX_SRC_BUFFER_SIZE;
> + if (!npcm_video_alloc_buf(video, &video->src, video->max_buffer_size))
> + return -ENOMEM;
> +
> + npcm_video_set_resolution(video);
> +
> + video->pix_fmt.width = video->active_timings.width;
> + video->pix_fmt.height = video->active_timings.height;
> + video->pix_fmt.sizeimage = video->max_buffer_size;
> + video->pix_fmt.bytesperline = video->bytesperline;
> +
> + if (atomic_inc_return(&video->ece.clients) == 1) {
> + npcm_video_ece_init(video);
> + npcm_video_ece_set_fb_addr(video, video->src.dma);
> + npcm_video_ece_set_lp(video, video->bytesperline);
> +
> + dev_dbg(video->dev, "ECE open: client %d\n",
> + atomic_read(&video->ece.clients));
> + }
> +
> + return 0;
> +}
> +
> +static void npcm_video_stop(struct npcm_video *video)
> +{
> + unsigned long flags;
> + struct regmap *vcd = video->vcd_regmap;
> +
> + spin_lock_irqsave(&video->lock, flags);
> + set_bit(VIDEO_STOPPED, &video->flags);
> + spin_unlock_irqrestore(&video->lock, flags);
> +
> + regmap_write(vcd, VCD_INTE, 0);
> + regmap_write(vcd, VCD_MODE, 0);
> + regmap_write(vcd, VCD_RCHG, 0);
> + regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
> +
> + if (video->src.size)
> + npcm_video_free_buf(video, &video->src);
> +
> + if (video->list)
> + npcm_video_free_diff_table(video);
> +
> + kfree(video->list);
> + video->list = NULL;
> +
> + kfree(video->rect);
> + video->rect = NULL;
> +
> + video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
> + video->flags = 0;
> + video->ctrl_cmd = VCD_CMD_OPERATION_CAPTURE;
> +
> + if (atomic_dec_return(&video->ece.clients) == 0) {
> + npcm_video_ece_stop(video);
> + dev_dbg(video->dev, "ECE close: client %d\n",
> + atomic_read(&video->ece.clients));
> + }
> +}
> +
> +static int npcm_video_querycap(struct file *file, void *fh,
> + struct v4l2_capability *cap)
> +{
> + strscpy(cap->driver, DEVICE_NAME, sizeof(cap->driver));
> + strscpy(cap->card, "NPCM Video Engine", sizeof(cap->card));
> + snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> + DEVICE_NAME);
> +
> + return 0;
> +}
> +
> +static int npcm_video_enum_format(struct file *file, void *fh,
> + struct v4l2_fmtdesc *f)
> +{
> + if (f->index)
> + return -EINVAL;
> +
> + f->pixelformat = V4L2_PIX_FMT_HEXTILE;
> +
> + return 0;
> +}
> +
> +static int npcm_video_get_format(struct file *file, void *fh,
> + struct v4l2_format *f)
> +{
> + struct npcm_video *video = video_drvdata(file);
> +
> + f->fmt.pix = video->pix_fmt;
> +
> + return 0;
> +}
> +
> +static int npcm_video_enum_input(struct file *file, void *fh,
> + struct v4l2_input *inp)
> +{
> + struct npcm_video *video = video_drvdata(file);
> +
> + if (inp->index)
> + return -EINVAL;
> +
> + strscpy(inp->name, "Host VGA capture", sizeof(inp->name));
> + inp->type = V4L2_INPUT_TYPE_CAMERA;
> + inp->capabilities = V4L2_IN_CAP_DV_TIMINGS;
> + inp->status = video->v4l2_input_status;
> +
> + return 0;
> +}
> +
> +static int npcm_video_get_input(struct file *file, void *fh, unsigned int *i)
> +{
> + *i = 0;
> +
> + return 0;
> +}
> +
> +static int npcm_video_set_input(struct file *file, void *fh, unsigned int i)
> +{
> + if (i)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int npcm_video_get_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *a)
> +{
> + struct npcm_video *video = video_drvdata(file);
> +
> + a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
> + a->parm.capture.readbuffers = 3;
> + a->parm.capture.timeperframe.numerator = 1;
> + if (!video->frame_rate)
> + a->parm.capture.timeperframe.denominator = MAX_FRAME_RATE;
> + else
> + a->parm.capture.timeperframe.denominator = video->frame_rate;
> +
> + return 0;
> +}
> +
> +static int npcm_video_set_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *a)
> +{
> + unsigned int frame_rate = 0;
> +
> + a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
> + a->parm.capture.readbuffers = 3;
> +
> + if (a->parm.capture.timeperframe.numerator)
> + frame_rate = a->parm.capture.timeperframe.denominator /
> + a->parm.capture.timeperframe.numerator;
> +
> + if (!frame_rate || frame_rate > MAX_FRAME_RATE) {
> + frame_rate = 0;
> + a->parm.capture.timeperframe.denominator = MAX_FRAME_RATE;
> + a->parm.capture.timeperframe.numerator = 1;
> + }
> +
> + return 0;
> +}
> +
> +static int npcm_video_set_dv_timings(struct file *file, void *fh,
> + struct v4l2_dv_timings *timings)
> +{
> + struct npcm_video *video = video_drvdata(file);
> +
> + if (timings->bt.width == video->active_timings.width &&
> + timings->bt.height == video->active_timings.height)
> + return 0;
> +
> + if (vb2_is_busy(&video->queue)) {
> + dev_err(video->dev, "%s device busy\n", __func__);
> + return -EBUSY;
> + }
> +
> + video->active_timings = timings->bt;
> +
> + npcm_video_set_resolution(video);
> +
> + video->pix_fmt.width = timings->bt.width;
> + video->pix_fmt.height = timings->bt.height;
> + video->pix_fmt.sizeimage = video->max_buffer_size;
> + video->pix_fmt.bytesperline = video->bytesperline;
> +
> + timings->type = V4L2_DV_BT_656_1120;
> +
> + return 0;
> +}
> +
> +static int npcm_video_get_dv_timings(struct file *file, void *fh,
> + struct v4l2_dv_timings *timings)
> +{
> + struct npcm_video *video = video_drvdata(file);
> +
> + timings->type = V4L2_DV_BT_656_1120;
> + timings->bt = video->active_timings;
> +
> + return 0;
> +}
> +
> +static int npcm_video_query_dv_timings(struct file *file, void *fh,
> + struct v4l2_dv_timings *timings)
> +{
> + struct npcm_video *video = video_drvdata(file);
> +
> + npcm_video_get_resolution(video);
> +
> + timings->type = V4L2_DV_BT_656_1120;
> + timings->bt = video->detected_timings;
> +
> + return video->v4l2_input_status ? -ENOLINK : 0;
> +}
> +
> +static int npcm_video_enum_dv_timings(struct file *file, void *fh,
> + struct v4l2_enum_dv_timings *timings)
> +{
> + return v4l2_enum_dv_timings_cap(timings, &npcm_video_timings_cap,
> + NULL, NULL);
> +}
> +
> +static int npcm_video_dv_timings_cap(struct file *file, void *fh,
> + struct v4l2_dv_timings_cap *cap)
> +{
> + *cap = npcm_video_timings_cap;
> +
> + return 0;
> +}
> +
> +static int npcm_video_sub_event(struct v4l2_fh *fh,
> + const struct v4l2_event_subscription *sub)
> +{
> + switch (sub->type) {
> + case V4L2_EVENT_SOURCE_CHANGE:
> + return v4l2_src_change_event_subscribe(fh, sub);
> + }
> +
> + return v4l2_ctrl_subscribe_event(fh, sub);
> +}
> +
> +static const struct v4l2_ioctl_ops npcm_video_ioctls = {
> + .vidioc_querycap = npcm_video_querycap,
> +
> + .vidioc_enum_fmt_vid_cap = npcm_video_enum_format,
> + .vidioc_g_fmt_vid_cap = npcm_video_get_format,
> + .vidioc_s_fmt_vid_cap = npcm_video_get_format,
> + .vidioc_try_fmt_vid_cap = npcm_video_get_format,
> +
> + .vidioc_reqbufs = vb2_ioctl_reqbufs,
> + .vidioc_querybuf = vb2_ioctl_querybuf,
> + .vidioc_qbuf = vb2_ioctl_qbuf,
> + .vidioc_expbuf = vb2_ioctl_expbuf,
> + .vidioc_dqbuf = vb2_ioctl_dqbuf,
> + .vidioc_create_bufs = vb2_ioctl_create_bufs,
> + .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> + .vidioc_streamon = vb2_ioctl_streamon,
> + .vidioc_streamoff = vb2_ioctl_streamoff,
> +
> + .vidioc_enum_input = npcm_video_enum_input,
> + .vidioc_g_input = npcm_video_get_input,
> + .vidioc_s_input = npcm_video_set_input,
> +
> + .vidioc_g_parm = npcm_video_get_parm,
> + .vidioc_s_parm = npcm_video_set_parm,
> +
> + .vidioc_s_dv_timings = npcm_video_set_dv_timings,
> + .vidioc_g_dv_timings = npcm_video_get_dv_timings,
> + .vidioc_query_dv_timings = npcm_video_query_dv_timings,
> + .vidioc_enum_dv_timings = npcm_video_enum_dv_timings,
> + .vidioc_dv_timings_cap = npcm_video_dv_timings_cap,
> +
> + .vidioc_subscribe_event = npcm_video_sub_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +};
> +
> +static int npcm_video_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct npcm_video *video = container_of(ctrl->handler,
> + struct npcm_video,
> + ctrl_handler);
> +
> + switch (ctrl->id) {
> + case V4L2_CID_NPCM_CAPTURE_MODE:
> + if (ctrl->val == V4L2_NPCM_CAPTURE_MODE_COMPLETE)
> + video->ctrl_cmd = VCD_CMD_OPERATION_CAPTURE;
> + else if (ctrl->val == V4L2_NPCM_CAPTURE_MODE_DIFF)
> + video->ctrl_cmd = VCD_CMD_OPERATION_COMPARE;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int npcm_video_get_volatile_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct npcm_video *video = container_of(ctrl->handler,
> + struct npcm_video,
> + ctrl_handler);
> +
> + switch (ctrl->id) {
> + case V4L2_CID_NPCM_RECT_COUNT:
> + ctrl->val = npcm_video_get_rect_count(video);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ctrl_ops npcm_video_ctrl_ops = {
> + .s_ctrl = npcm_video_set_ctrl,
> + .g_volatile_ctrl = npcm_video_get_volatile_ctrl,
> +};
> +
> +static const struct v4l2_ctrl_config npcm_ctrl_capture_mode = {
> + .ops = &npcm_video_ctrl_ops,
> + .id = V4L2_CID_NPCM_CAPTURE_MODE,
> + .name = "NPCM Video Capture Mode",
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .min = 0,
> + .max = V4L2_NPCM_CAPTURE_MODE_DIFF,
> + .step = 1,
> + .def = 0,
> +};
> +
> +static const struct v4l2_ctrl_config npcm_ctrl_rect_count = {
> + .ops = &npcm_video_ctrl_ops,
> + .id = V4L2_CID_NPCM_RECT_COUNT,
> + .name = "NPCM Compressed Hextile Rectangle Count",
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .flags = V4L2_CTRL_FLAG_VOLATILE,
> + .min = 0,
> + .max = (MAX_WIDTH / RECT_W) * (MAX_HEIGHT / RECT_H),
> + .step = 1,
> + .def = 0,
> +};
> +
> +static int npcm_video_open(struct file *file)
> +{
> + int rc;
> + struct npcm_video *video = video_drvdata(file);
> +
> + mutex_lock(&video->video_lock);
> +
> + rc = v4l2_fh_open(file);
> + if (rc) {
> + mutex_unlock(&video->video_lock);
> + return rc;
> + }
> +
> + if (v4l2_fh_is_singular_file(file))
> + npcm_video_start(video);
> +
> + mutex_unlock(&video->video_lock);
> +
> + return 0;
> +}
> +
> +static int npcm_video_release(struct file *file)
> +{
> + int rc;
> + struct npcm_video *video = video_drvdata(file);
> +
> + mutex_lock(&video->video_lock);
> +
> + if (v4l2_fh_is_singular_file(file))
> + npcm_video_stop(video);
> +
> + rc = _vb2_fop_release(file, NULL);
> +
> + mutex_unlock(&video->video_lock);
> +
> + return rc;
> +}
> +
> +static const struct v4l2_file_operations npcm_video_v4l2_fops = {
> + .owner = THIS_MODULE,
> + .read = vb2_fop_read,
> + .poll = vb2_fop_poll,
> + .unlocked_ioctl = video_ioctl2,
> + .mmap = vb2_fop_mmap,
> + .open = npcm_video_open,
> + .release = npcm_video_release,
> +};
> +
> +static int npcm_video_queue_setup(struct vb2_queue *q,
> + unsigned int *num_buffers,
> + unsigned int *num_planes,
> + unsigned int sizes[],
> + struct device *alloc_devs[])
> +{
> + struct npcm_video *video = vb2_get_drv_priv(q);
> + unsigned int i;
> +
> + if (*num_planes) {
> + if (sizes[0] < video->max_buffer_size)
> + return -EINVAL;
> +
> + return 0;
> + }
> +
> + *num_planes = 1;
> + sizes[0] = video->max_buffer_size;
> +
> + kfree(video->rect);
> + video->rect = NULL;
> +
> + video->rect = kcalloc(*num_buffers, sizeof(*video->rect), GFP_KERNEL);
In practice "small allocations never fail", but what if kcalloc fails some day?
> +
> + if (video->list) {
> + npcm_video_free_diff_table(video);
> + kfree(video->list);
> + video->list = NULL;
> + }
> +
> + video->list = kzalloc(sizeof(*video->list) * *num_buffers, GFP_KERNEL);
Or kzalloc?
> +
> + for (i = 0; i < *num_buffers; i++)
> + INIT_LIST_HEAD(&video->list[i]);
> +
> + video->num_buffers = *num_buffers;
> +
> + return 0;
> +}
> +
> +static int npcm_video_buf_prepare(struct vb2_buffer *vb)
> +{
> + struct npcm_video *video = vb2_get_drv_priv(vb->vb2_queue);
> +
> + if (vb2_plane_size(vb, 0) < video->max_buffer_size)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int npcm_video_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> + int rc;
> + struct npcm_video *video = vb2_get_drv_priv(q);
> +
> + video->sequence = 0;
> +
> + rc = npcm_video_start_frame(video);
> + if (rc) {
> + npcm_video_bufs_done(video, VB2_BUF_STATE_QUEUED);
> + return rc;
> + }
> +
> + set_bit(VIDEO_STREAMING, &video->flags);
> + return 0;
> +}
> +
> +static void npcm_video_stop_streaming(struct vb2_queue *q)
> +{
> + struct npcm_video *video = vb2_get_drv_priv(q);
> + struct regmap *vcd = video->vcd_regmap;
> +
> + clear_bit(VIDEO_STREAMING, &video->flags);
> +
> + regmap_write(vcd, VCD_INTE, 0);
> + regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
> + npcm_video_gfx_reset(video);
> +
> + npcm_video_bufs_done(video, VB2_BUF_STATE_ERROR);
> +
> + video->ctrl_cmd = VCD_CMD_OPERATION_CAPTURE;
> +}
> +
> +static void npcm_video_buf_queue(struct vb2_buffer *vb)
> +{
> + struct npcm_video *video = vb2_get_drv_priv(vb->vb2_queue);
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct npcm_video_buffer *nvb = to_npcm_video_buffer(vbuf);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&video->lock, flags);
> + list_add_tail(&nvb->link, &video->buffers);
> + spin_unlock_irqrestore(&video->lock, flags);
> +}
> +
> +static void npcm_video_buf_finish(struct vb2_buffer *vb)
> +{
> + struct npcm_video *video = vb2_get_drv_priv(vb->vb2_queue);
> + struct regmap *vcd = video->vcd_regmap;
> + u32 val;
> + int ret;
> +
> + ret = regmap_read_poll_timeout(vcd, VCD_STAT, val,
> + !(val & VCD_STAT_BUSY), 1000,
> + VCD_BUSY_TIMEOUT_US);
> +
> + if (ret) {
> + dev_warn(video->dev, "Wait for VCD_STAT_BUSY timeout\n");
> + return;
> + }
> +
> + /* Capture next frame when a video buffer is dequeued */
> + npcm_video_start_frame(video);
> +
> + video->vb_index = vb->index;
> +}
> +
> +static const struct vb2_ops npcm_video_vb2_ops = {
> + .queue_setup = npcm_video_queue_setup,
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> + .buf_prepare = npcm_video_buf_prepare,
> + .buf_finish = npcm_video_buf_finish,
> + .start_streaming = npcm_video_start_streaming,
> + .stop_streaming = npcm_video_stop_streaming,
> + .buf_queue = npcm_video_buf_queue,
> +};
> +
> +static int npcm_video_setup_video(struct npcm_video *video)
> +{
> + struct v4l2_device *v4l2_dev = &video->v4l2_dev;
> + struct video_device *vdev = &video->vdev;
> + struct vb2_queue *vbq = &video->queue;
> + int rc;
> +
> + video->pix_fmt.pixelformat = V4L2_PIX_FMT_HEXTILE;
> + video->pix_fmt.field = V4L2_FIELD_NONE;
> + video->pix_fmt.colorspace = V4L2_COLORSPACE_SRGB;
> + video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
> +
> + rc = v4l2_device_register(video->dev, v4l2_dev);
> + if (rc) {
> + dev_err(video->dev, "Failed to register v4l2 device\n");
> + return rc;
> + }
> +
> + v4l2_ctrl_handler_init(&video->ctrl_handler, 2);
> + v4l2_ctrl_new_custom(&video->ctrl_handler, &npcm_ctrl_capture_mode,
> + NULL);
> + v4l2_ctrl_new_custom(&video->ctrl_handler, &npcm_ctrl_rect_count, NULL);
> +
> + if (video->ctrl_handler.error) {
> + dev_err(video->dev, "Failed to init controls: %d\n",
> + video->ctrl_handler.error);
> +
> + rc = video->ctrl_handler.error;
> +
> + v4l2_ctrl_handler_free(&video->ctrl_handler);
> + v4l2_device_unregister(v4l2_dev);
> +
> + return rc;
> + }
> +
> + v4l2_dev->ctrl_handler = &video->ctrl_handler;
> +
> + vbq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + vbq->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
> + vbq->dev = v4l2_dev->dev;
> + vbq->lock = &video->video_lock;
> + vbq->ops = &npcm_video_vb2_ops;
> + vbq->mem_ops = &vb2_dma_contig_memops;
> + vbq->drv_priv = video;
> + vbq->buf_struct_size = sizeof(struct npcm_video_buffer);
> + vbq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> + vbq->min_buffers_needed = 3;
> +
> + rc = vb2_queue_init(vbq);
> + if (rc) {
> + v4l2_ctrl_handler_free(&video->ctrl_handler);
> + v4l2_device_unregister(v4l2_dev);
> +
> + dev_err(video->dev, "Failed to init vb2 queue\n");
> + return rc;
> + }
> +
> + vdev->queue = vbq;
> + vdev->fops = &npcm_video_v4l2_fops;
> + vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
> + V4L2_CAP_STREAMING;
> + vdev->v4l2_dev = v4l2_dev;
> + strscpy(vdev->name, DEVICE_NAME, sizeof(vdev->name));
> + vdev->vfl_type = VFL_TYPE_VIDEO;
> + vdev->vfl_dir = VFL_DIR_RX;
> + vdev->release = video_device_release_empty;
> + vdev->ioctl_ops = &npcm_video_ioctls;
> + vdev->lock = &video->video_lock;
> +
> + video_set_drvdata(vdev, video);
> + rc = video_register_device(vdev, VFL_TYPE_VIDEO, 0);
> + if (rc) {
> + vb2_queue_release(vbq);
> + v4l2_ctrl_handler_free(&video->ctrl_handler);
> + v4l2_device_unregister(v4l2_dev);
> +
> + dev_err(video->dev, "Failed to register video device\n");
> + return rc;
> + }
In this function there are 3 similar error recovery paths. Can nice "goto"s
be introduced to handle them?
> +
> + return 0;
> +}
> +
> +static int npcm_video_init(struct npcm_video *video)
> +{
> + int irq;
> + int rc;
> + struct device *dev = video->dev;
> +
> + irq = irq_of_parse_and_map(dev->of_node, 0);
> + if (!irq) {
> + dev_err(dev, "Unable to find VCD IRQ\n");
> + return -ENODEV;
> + }
> +
> + rc = devm_request_threaded_irq(dev, irq, NULL, npcm_video_irq,
> + IRQF_ONESHOT, DEVICE_NAME, video);
> + if (rc < 0) {
> + dev_err(dev, "Unable to request IRQ %d\n", irq);
> + return rc;
> + }
> +
> + of_reserved_mem_device_init(dev);
> +
> + rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
> + if (rc) {
> + dev_err(dev, "Failed to set DMA mask\n");
> + of_reserved_mem_device_release(dev);
> + }
> +
> + return rc;
> +}
> +
> +static const struct regmap_config npcm_video_regmap_cfg = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> + .max_register = VCD_FIFO,
> +};
> +
> +static const struct regmap_config npcm_video_ece_regmap_cfg = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> + .max_register = ECE_HEX_RECT_OFFSET,
> +};
> +
> +static int npcm_video_probe(struct platform_device *pdev)
> +{
> + int rc;
> + void __iomem *regs;
> + struct npcm_video *video = kzalloc(sizeof(*video), GFP_KERNEL);
> +
> + if (!video)
> + return -ENOMEM;
> +
> + video->frame_rate = MAX_FRAME_RATE;
> + video->dev = &pdev->dev;
> + spin_lock_init(&video->lock);
> + mutex_init(&video->video_lock);
> + INIT_LIST_HEAD(&video->buffers);
> +
> + regs = devm_platform_ioremap_resource_byname(pdev, VCD_MODULE_NAME);
> + if (IS_ERR(regs)) {
> + dev_err(&pdev->dev, "Failed to find VCD reg-names in DTS!\n");
> + return PTR_ERR(regs);
> + }
> +
> + video->vcd_regmap = devm_regmap_init_mmio(&pdev->dev, regs,
> + &npcm_video_regmap_cfg);
> + if (IS_ERR(video->vcd_regmap)) {
> + dev_err(&pdev->dev, "Failed to initialize VCD regmap!\n");
> + return PTR_ERR(video->vcd_regmap);
> + }
> +
> + regs = devm_platform_ioremap_resource_byname(pdev, ECE_MODULE_NAME);
> + if (IS_ERR(regs)) {
> + dev_err(&pdev->dev, "Failed to find ECE reg-names in DTS!\n");
> + return PTR_ERR(regs);
> + }
> +
> + video->ece.regmap = devm_regmap_init_mmio(&pdev->dev, regs,
> + &npcm_video_ece_regmap_cfg);
> + if (IS_ERR(video->ece.regmap)) {
> + dev_err(&pdev->dev, "Failed to initialize ECE regmap!\n");
> + return PTR_ERR(video->ece.regmap);
> + }
> +
> + video->reset = devm_reset_control_get(&pdev->dev, VCD_MODULE_NAME);
> + if (IS_ERR(video->reset)) {
> + dev_err(&pdev->dev, "Failed to find VCD reset-names in DTS!\n");
> + return PTR_ERR(video->reset);
> + }
> +
> + video->ece.reset = devm_reset_control_get(&pdev->dev, ECE_MODULE_NAME);
> + if (IS_ERR(video->ece.reset)) {
> + dev_err(&pdev->dev, "Failed to find ECE reset-names in DTS!\n");
> + return PTR_ERR(video->ece.reset);
> + }
> +
> + video->gcr_regmap =
> + syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "gcr-syscon");
> + if (IS_ERR(video->gcr_regmap))
> + return PTR_ERR(video->gcr_regmap);
> +
> + video->gfx_regmap =
> + syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "gfxi-syscon");
> + if (IS_ERR(video->gfx_regmap))
> + return PTR_ERR(video->gfx_regmap);
> +
> + rc = npcm_video_init(video);
> + if (rc)
> + return rc;
> +
> + rc = npcm_video_setup_video(video);
> + if (rc)
> + return rc;
> +
> + dev_info(video->dev, "NPCM video driver probed\n");
> +
> + return 0;
> +}
> +
> +static int npcm_video_remove(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
> + struct npcm_video *video = to_npcm_video(v4l2_dev);
> +
> + video_unregister_device(&video->vdev);
> +
> + vb2_queue_release(&video->queue);
> +
> + v4l2_ctrl_handler_free(&video->ctrl_handler);
> +
> + v4l2_device_unregister(v4l2_dev);
> +
> + npcm_video_ece_stop(video);
> +
> + of_reserved_mem_device_release(dev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id npcm_video_match[] = {
> + { .compatible = "nuvoton,npcm750-video" },
> + { .compatible = "nuvoton,npcm845-video" },
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, npcm_video_match);
> +
> +static struct platform_driver npcm_video_driver = {
> + .driver = {
> + .name = DEVICE_NAME,
> + .of_match_table = npcm_video_match,
> + },
> + .probe = npcm_video_probe,
> + .remove = npcm_video_remove,
> +};
> +
> +module_platform_driver(npcm_video_driver);
> +
> +MODULE_AUTHOR("Joseph Liu<kwliu at nuvoton.com>");
> +MODULE_AUTHOR("Marvin Lin<kflin at nuvoton.com>");
> +MODULE_DESCRIPTION("Driver for Nuvoton NPCM Video Capture/Encode Engine");
> +MODULE_LICENSE("GPL");
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