/*
* V4L2 Driver for i.MX27 camera host
*
* Copyright (C) 2008, Sascha Hauer, Pengutronix
* Copyright (C) 2010, Baruch Siach, Orex Computed Radiography
* Copyright (C) 2012, Javier Martin, Vista Silicon S.L.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/gcd.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/time.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-contig.h>
#include <media/soc_camera.h>
#include <media/soc_mediabus.h>
#include <linux/videodev2.h>
#include <linux/platform_data/camera-mx2.h>
#include <asm/dma.h>
#define MX2_CAM_DRV_NAME "mx2-camera"
#define MX2_CAM_VERSION "0.0.6"
#define MX2_CAM_DRIVER_DESCRIPTION "i.MX2x_Camera"
/* reset values */
#define CSICR1_RESET_VAL 0x40000800
#define CSICR2_RESET_VAL 0x0
#define CSICR3_RESET_VAL 0x0
/* csi control reg 1 */
#define CSICR1_SWAP16_EN (1 << 31)
#define CSICR1_EXT_VSYNC (1 << 30)
#define CSICR1_EOF_INTEN (1 << 29)
#define CSICR1_PRP_IF_EN (1 << 28)
#define CSICR1_CCIR_MODE (1 << 27)
#define CSICR1_COF_INTEN (1 << 26)
#define CSICR1_SF_OR_INTEN (1 << 25)
#define CSICR1_RF_OR_INTEN (1 << 24)
#define CSICR1_STATFF_LEVEL (3 << 22)
#define CSICR1_STATFF_INTEN (1 << 21)
#define CSICR1_RXFF_LEVEL(l) (((l) & 3) << 19)
#define CSICR1_RXFF_INTEN (1 << 18)
#define CSICR1_SOF_POL (1 << 17)
#define CSICR1_SOF_INTEN (1 << 16)
#define CSICR1_MCLKDIV(d) (((d) & 0xF) << 12)
#define CSICR1_HSYNC_POL (1 << 11)
#define CSICR1_CCIR_EN (1 << 10)
#define CSICR1_MCLKEN (1 << 9)
#define CSICR1_FCC (1 << 8)
#define CSICR1_PACK_DIR (1 << 7)
#define CSICR1_CLR_STATFIFO (1 << 6)
#define CSICR1_CLR_RXFIFO (1 << 5)
#define CSICR1_GCLK_MODE (1 << 4)
#define CSICR1_INV_DATA (1 << 3)
#define CSICR1_INV_PCLK (1 << 2)
#define CSICR1_REDGE (1 << 1)
#define CSICR1_FMT_MASK (CSICR1_PACK_DIR | CSICR1_SWAP16_EN)
#define SHIFT_STATFF_LEVEL 22
#define SHIFT_RXFF_LEVEL 19
#define SHIFT_MCLKDIV 12
#define SHIFT_FRMCNT 16
#define CSICR1 0x00
#define CSICR2 0x04
#define CSISR 0x08
#define CSISTATFIFO 0x0c
#define CSIRFIFO 0x10
#define CSIRXCNT 0x14
#define CSICR3 0x1c
#define CSIDMASA_STATFIFO 0x20
#define CSIDMATA_STATFIFO 0x24
#define CSIDMASA_FB1 0x28
#define CSIDMASA_FB2 0x2c
#define CSIFBUF_PARA 0x30
#define CSIIMAG_PARA 0x34
/* EMMA PrP */
#define PRP_CNTL 0x00
#define PRP_INTR_CNTL 0x04
#define PRP_INTRSTATUS 0x08
#define PRP_SOURCE_Y_PTR 0x0c
#define PRP_SOURCE_CB_PTR 0x10
#define PRP_SOURCE_CR_PTR 0x14
#define PRP_DEST_RGB1_PTR 0x18
#define PRP_DEST_RGB2_PTR 0x1c
#define PRP_DEST_Y_PTR 0x20
#define PRP_DEST_CB_PTR 0x24
#define PRP_DEST_CR_PTR 0x28
#define PRP_SRC_FRAME_SIZE 0x2c
#define PRP_DEST_CH1_LINE_STRIDE 0x30
#define PRP_SRC_PIXEL_FORMAT_CNTL 0x34
#define PRP_CH1_PIXEL_FORMAT_CNTL 0x38
#define PRP_CH1_OUT_IMAGE_SIZE 0x3c
#define PRP_CH2_OUT_IMAGE_SIZE 0x40
#define PRP_SRC_LINE_STRIDE 0x44
#define PRP_CSC_COEF_012 0x48
#define PRP_CSC_COEF_345 0x4c
#define PRP_CSC_COEF_678 0x50
#define PRP_CH1_RZ_HORI_COEF1 0x54
#define PRP_CH1_RZ_HORI_COEF2 0x58
#define PRP_CH1_RZ_HORI_VALID 0x5c
#define PRP_CH1_RZ_VERT_COEF1 0x60
#define PRP_CH1_RZ_VERT_COEF2 0x64
#define PRP_CH1_RZ_VERT_VALID 0x68
#define PRP_CH2_RZ_HORI_COEF1 0x6c
#define PRP_CH2_RZ_HORI_COEF2 0x70
#define PRP_CH2_RZ_HORI_VALID 0x74
#define PRP_CH2_RZ_VERT_COEF1 0x78
#define PRP_CH2_RZ_VERT_COEF2 0x7c
#define PRP_CH2_RZ_VERT_VALID 0x80
#define PRP_CNTL_CH1EN (1 << 0)
#define PRP_CNTL_CH2EN (1 << 1)
#define PRP_CNTL_CSIEN (1 << 2)
#define PRP_CNTL_DATA_IN_YUV420 (0 << 3)
#define PRP_CNTL_DATA_IN_YUV422 (1 << 3)
#define PRP_CNTL_DATA_IN_RGB16 (2 << 3)
#define PRP_CNTL_DATA_IN_RGB32 (3 << 3)
#define PRP_CNTL_CH1_OUT_RGB8 (0 << 5)
#define PRP_CNTL_CH1_OUT_RGB16 (1 << 5)
#define PRP_CNTL_CH1_OUT_RGB32 (2 << 5)
#define PRP_CNTL_CH1_OUT_YUV422 (3 << 5)
#define PRP_CNTL_CH2_OUT_YUV420 (0 << 7)
#define PRP_CNTL_CH2_OUT_YUV422 (1 << 7)
#define PRP_CNTL_CH2_OUT_YUV444 (2 << 7)
#define PRP_CNTL_CH1_LEN (1 << 9)
#define PRP_CNTL_CH2_LEN (1 << 10)
#define PRP_CNTL_SKIP_FRAME (1 << 11)
#define PRP_CNTL_SWRST (1 << 12)
#define PRP_CNTL_CLKEN (1 << 13)
#define PRP_CNTL_WEN (1 << 14)
#define PRP_CNTL_CH1BYP (1 << 15)
#define PRP_CNTL_IN_TSKIP(x) ((x) << 16)
#define PRP_CNTL_CH1_TSKIP(x) ((x) << 19)
#define PRP_CNTL_CH2_TSKIP(x) ((x) << 22)
#define PRP_CNTL_INPUT_FIFO_LEVEL(x) ((x) << 25)
#define PRP_CNTL_RZ_FIFO_LEVEL(x) ((x) << 27)
#define PRP_CNTL_CH2B1EN (1 << 29)
#define PRP_CNTL_CH2B2EN (1 << 30)
#define PRP_CNTL_CH2FEN (1 << 31)
/* IRQ Enable and status register */
#define PRP_INTR_RDERR (1 << 0)
#define PRP_INTR_CH1WERR (1 << 1)
#define PRP_INTR_CH2WERR (1 << 2)
#define PRP_INTR_CH1FC (1 << 3)
#define PRP_INTR_CH2FC (1 << 5)
#define PRP_INTR_LBOVF (1 << 7)
#define PRP_INTR_CH2OVF (1 << 8)
/* Resizing registers */
#define PRP_RZ_VALID_TBL_LEN(x) ((x) << 24)
#define PRP_RZ_VALID_BILINEAR (1 << 31)
#define MAX_VIDEO_MEM 16
#define RESIZE_NUM_MIN 1
#define RESIZE_NUM_MAX 20
#define BC_COEF 3
#define SZ_COEF (1 << BC_COEF)
#define RESIZE_DIR_H 0
#define RESIZE_DIR_V 1
#define RESIZE_ALGO_BILINEAR 0
#define RESIZE_ALGO_AVERAGING 1
struct mx2_prp_cfg {
int channel;
u32 in_fmt;
u32 out_fmt;
u32 src_pixel;
u32 ch1_pixel;
u32 irq_flags;
u32 csicr1;
};
/* prp resizing parameters */
struct emma_prp_resize {
int algo; /* type of algorithm used */
int len; /* number of coefficients */
unsigned char s[RESIZE_NUM_MAX]; /* table of coefficients */
};
/* prp configuration for a client-host fmt pair */
struct mx2_fmt_cfg {
enum v4l2_mbus_pixelcode in_fmt;
u32 out_fmt;
struct mx2_prp_cfg cfg;
};
struct mx2_buf_internal {
struct list_head queue;
int bufnum;
bool discard;
};
/* buffer for one video frame */
struct mx2_buffer {
/* common v4l buffer stuff -- must be first */
struct vb2_buffer vb;
struct mx2_buf_internal internal;
};
enum mx2_camera_type {
IMX27_CAMERA,
};
struct mx2_camera_dev {
struct device *dev;
struct soc_camera_host soc_host;
struct clk *clk_emma_ahb, *clk_emma_ipg;
struct clk *clk_csi_ahb, *clk_csi_per;
void __iomem *base_csi, *base_emma;
struct mx2_camera_platform_data *pdata;
unsigned long platform_flags;
struct list_head capture;
struct list_head active_bufs;
struct list_head discard;
spinlock_t lock;
int dma;
struct mx2_buffer *active;
struct mx2_buffer *fb1_active;
struct mx2_buffer *fb2_active;
u32 csicr1;
enum mx2_camera_type devtype;
struct mx2_buf_internal buf_discard[2];
void *discard_buffer;
dma_addr_t discard_buffer_dma;
size_t discard_size;
struct mx2_fmt_cfg *emma_prp;
struct emma_prp_resize resizing[2];
unsigned int s_width, s_height;
u32 frame_count;
struct vb2_alloc_ctx *alloc_ctx;
};
static struct platform_device_id mx2_camera_devtype[] = {
{
.name = "imx27-camera",
.driver_data = IMX27_CAMERA,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, mx2_camera_devtype);
static struct mx2_buffer *mx2_ibuf_to_buf(struct mx2_buf_internal *int_buf)
{
return container_of(int_buf, struct mx2_buffer, internal);
}
static struct mx2_fmt_cfg mx27_emma_prp_table[] = {
/*
* This is a generic configuration which is valid for most
* prp input-output format combinations.
* We set the incoming and outgoing pixelformat to a
* 16 Bit wide format and adjust the bytesperline
* accordingly. With this configuration the inputdata
* will not be changed by the emma and could be any type
* of 16 Bit Pixelformat.
*/
{
.in_fmt = 0,
.out_fmt = 0,
.cfg = {
.channel = 1,
.in_fmt = PRP_CNTL_DATA_IN_RGB16,
.out_fmt = PRP_CNTL_CH1_OUT_RGB16,
.src_pixel = 0x2ca00565, /* RGB565 */
.ch1_pixel = 0x2ca00565, /* RGB565 */
.irq_flags = PRP_INTR_RDERR | PRP_INTR_CH1WERR |
PRP_INTR_CH1FC | PRP_INTR_LBOVF,
.csicr1 = 0,
}
},
{
.in_fmt = V4L2_MBUS_FMT_UYVY8_2X8,
.out_fmt = V4L2_PIX_FMT_YUYV,
.cfg = {
.channel = 1,
.in_fmt = PRP_CNTL_DATA_IN_YUV422,
.out_fmt = PRP_CNTL_CH1_OUT_YUV422,
.src_pixel = 0x22000888, /* YUV422 (YUYV) */
.ch1_pixel = 0x62000888, /* YUV422 (YUYV) */
.irq_flags = PRP_INTR_RDERR | PRP_INTR_CH1WERR |
PRP_INTR_CH1FC | PRP_INTR_LBOVF,
.csicr1 = CSICR1_SWAP16_EN,
}
},
{
.in_fmt = V4L2_MBUS_FMT_YUYV8_2X8,
.out_fmt = V4L2_PIX_FMT_YUYV,
.cfg = {
.channel = 1,
.in_fmt = PRP_CNTL_DATA_IN_YUV422,
.out_fmt = PRP_CNTL_CH1_OUT_YUV422,
.src_pixel = 0x22000888, /* YUV422 (YUYV) */
.ch1_pixel = 0x62000888, /* YUV422 (YUYV) */
.irq_flags = PRP_INTR_RDERR | PRP_INTR_CH1WERR |
PRP_INTR_CH1FC | PRP_INTR_LBOVF,
.csicr1 = CSICR1_PACK_DIR,
}
},
{
.in_fmt = V4L2_MBUS_FMT_YUYV8_2X8,
.out_fmt = V4L2_PIX_FMT_YUV420,
.cfg = {
.channel = 2,
.in_fmt = PRP_CNTL_DATA_IN_YUV422,
.out_fmt = PRP_CNTL_CH2_OUT_YUV420,
.src_pixel = 0x22000888, /* YUV422 (YUYV) */
.irq_flags = PRP_INTR_RDERR | PRP_INTR_CH2WERR |
PRP_INTR_CH2FC | PRP_INTR_LBOVF |
PRP_INTR_CH2OVF,
.csicr1 = CSICR1_PACK_DIR,
}
},
{
.in_fmt = V4L2_MBUS_FMT_UYVY8_2X8,
.out_fmt = V4L2_PIX_FMT_YUV420,
.cfg = {
.channel = 2,
.in_fmt = PRP_CNTL_DATA_IN_YUV422,
.out_fmt = PRP_CNTL_CH2_OUT_YUV420,
.src_pixel = 0x22000888, /* YUV422 (YUYV) */
.irq_flags = PRP_INTR_RDERR | PRP_INTR_CH2WERR |
PRP_INTR_CH2FC | PRP_INTR_LBOVF |
PRP_INTR_CH2OVF,
.csicr1 = CSICR1_SWAP16_EN,
}
},
};
static struct mx2_fmt_cfg *mx27_emma_prp_get_format(
enum v4l2_mbus_pixelcode in_fmt,
u32 out_fmt)
{
int i;
for (i = 1; i < ARRAY_SIZE(mx27_emma_prp_table); i++)
if ((mx27_emma_prp_table[i].in_fmt == in_fmt) &&
(mx27_emma_prp_table[i].out_fmt == out_fmt)) {
return &mx27_emma_prp_table[i];
}
/* If no match return the most generic configuration */
return &mx27_emma_prp_table[0];
};
static void mx27_update_emma_buf(struct mx2_camera_dev *pcdev,
unsigned long phys, int bufnum)
{
struct mx2_fmt_cfg *prp = pcdev->emma_prp;
if (prp->cfg.channel == 1) {
writel(phys, pcdev->base_emma +
PRP_DEST_RGB1_PTR + 4 * bufnum);
} else {
writel(phys, pcdev->base_emma +
PRP_DEST_Y_PTR - 0x14 * bufnum);
if (prp->out_fmt == V4L2_PIX_FMT_YUV420) {
u32 imgsize = pcdev->soc_host.icd->user_height *
pcdev->soc_host.icd->user_width;
writel(phys + imgsize, pcdev->base_emma +
PRP_DEST_CB_PTR - 0x14 * bufnum);
writel(phys + ((5 * imgsize) / 4), pcdev->base_emma +
PRP_DEST_CR_PTR - 0x14 * bufnum);
}
}
}
static void mx2_camera_deactivate(struct mx2_camera_dev *pcdev)
{
clk_disable_unprepare(pcdev->clk_csi_ahb);
clk_disable_unprepare(pcdev->clk_csi_per);
writel(0, pcdev->base_csi + CSICR1);
writel(0, pcdev->base_emma + PRP_CNTL);
}
static int mx2_camera_add_device(struct soc_camera_device *icd)
{
dev_info(icd->parent, "Camera driver attached to camera %d\n",
icd->devnum);
return 0;
}
static void mx2_camera_remove_device(struct soc_camera_device *icd)
{
dev_info(icd->parent, "Camera driver detached from camera %d\n",
icd->devnum);
}
/*
* The following two functions absolutely depend on the fact, that
* there can be only one camera on mx2 camera sensor interface
*/
static int mx2_camera_clock_start(struct soc_camera_host *ici)
{
struct mx2_camera_dev *pcdev = ici->priv;
int ret;
u32 csicr1;
ret = clk_prepare_enable(pcdev->clk_csi_ahb);
if (ret < 0)
return ret;
ret = clk_prepare_enable(pcdev->clk_csi_per);
if (ret < 0)
goto exit_csi_ahb;
csicr1 = CSICR1_MCLKEN | CSICR1_PRP_IF_EN | CSICR1_FCC |
CSICR1_RXFF_LEVEL(0);
pcdev->csicr1 = csicr1;
writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
pcdev->frame_count = 0;
return 0;
exit_csi_ahb:
clk_disable_unprepare(pcdev->clk_csi_ahb);
return ret;
}
static void mx2_camera_clock_stop(struct soc_camera_host *ici)
{
struct mx2_camera_dev *pcdev = ici->priv;
mx2_camera_deactivate(pcdev);
}
/*
* Videobuf operations
*/
static int mx2_videobuf_setup(struct vb2_queue *vq,
const struct v4l2_format *fmt,
unsigned int *count, unsigned int *num_planes,
unsigned int sizes[], void *alloc_ctxs[])
{
struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct mx2_camera_dev *pcdev = ici->priv;
dev_dbg(icd->parent, "count=%d, size=%d\n", *count, sizes[0]);
/* TODO: support for VIDIOC_CREATE_BUFS not ready */
if (fmt != NULL)
return -ENOTTY;
alloc_ctxs[0] = pcdev->alloc_ctx;
sizes[0] = icd->sizeimage;
if (0 == *count)
*count = 32;
if (!*num_planes &&
sizes[0] * *count > MAX_VIDEO_MEM * 1024 * 1024)
*count = (MAX_VIDEO_MEM * 1024 * 1024) / sizes[0];
*num_planes = 1;
return 0;
}
static int mx2_videobuf_prepare(struct vb2_buffer *vb)
{
struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
int ret = 0;
dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
#ifdef DEBUG
/*
* This can be useful if you want to see if we actually fill
* the buffer with something
*/
memset((void *)vb2_plane_vaddr(vb, 0),
0xaa, vb2_get_plane_payload(vb, 0));
#endif
vb2_set_plane_payload(vb, 0, icd->sizeimage);
if (vb2_plane_vaddr(vb, 0) &&
vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) {
ret = -EINVAL;
goto out;
}
return 0;
out:
return ret;
}
static void mx2_videobuf_queue(struct vb2_buffer *vb)
{
struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
struct soc_camera_host *ici =
to_soc_camera_host(icd->parent);
struct mx2_camera_dev *pcdev = ici->priv;
struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb);
unsigned long flags;
dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
spin_lock_irqsave(&pcdev->lock, flags);
list_add_tail(&buf->internal.queue, &pcdev->capture);
spin_unlock_irqrestore(&pcdev->lock, flags);
}
static void mx27_camera_emma_buf_init(struct soc_camera_device *icd,
int bytesperline)
{
struct soc_camera_host *ici =
to_soc_camera_host(icd->parent);
struct mx2_camera_dev *pcdev = ici->priv;
struct mx2_fmt_cfg *prp = pcdev->emma_prp;
writel((pcdev->s_width << 16) | pcdev->s_height,
pcdev->base_emma + PRP_SRC_FRAME_SIZE);
writel(prp->cfg.src_pixel,
pcdev->base_emma + PRP_SRC_PIXEL_FORMAT_CNTL);
if (prp->cfg.channel == 1) {
writel((icd->user_width << 16) | icd->user_height,
pcdev->base_emma + PRP_CH1_OUT_IMAGE_SIZE);
writel(bytesperline,
pcdev->base_emma + PRP_DEST_CH1_LINE_STRIDE);
writel(prp->cfg.ch1_pixel,
pcdev->base_emma + PRP_CH1_PIXEL_FORMAT_CNTL);
} else { /* channel 2 */
writel((icd->user_width << 16) | icd->user_height,
pcdev->base_emma + PRP_CH2_OUT_IMAGE_SIZE);
}
/* Enable interrupts */
writel(prp->cfg.irq_flags, pcdev->base_emma + PRP_INTR_CNTL);
}
static void mx2_prp_resize_commit(struct mx2_camera_dev *pcdev)
{
int dir;
for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
unsigned char *s = pcdev->resizing[dir].s;
int len = pcdev->resizing[dir].len;
unsigned int coeff[2] = {0, 0};
unsigned int valid = 0;
int i;
if (len == 0)
continue;
for (i = RESIZE_NUM_MAX - 1; i >= 0; i--) {
int j;
j = i > 9 ? 1 : 0;
coeff[j] = (coeff[j] << BC_COEF) |
(s[i] & (SZ_COEF - 1));
if (i == 5 || i == 15)
coeff[j] <<= 1;
valid = (valid << 1) | (s[i] >> BC_COEF);
}
valid |= PRP_RZ_VALID_TBL_LEN(len);
if (pcdev->resizing[dir].algo == RESIZE_ALGO_BILINEAR)
valid |= PRP_RZ_VALID_BILINEAR;
if (pcdev->emma_prp->cfg.channel == 1) {
if (dir == RESIZE_DIR_H) {
writel(coeff[0], pcdev->base_emma +
PRP_CH1_RZ_HORI_COEF1);
writel(coeff[1], pcdev->base_emma +
PRP_CH1_RZ_HORI_COEF2);
writel(valid, pcdev->base_emma +
PRP_CH1_RZ_HORI_VALID);
} else {
writel(coeff[0], pcdev->base_emma +
PRP_CH1_RZ_VERT_COEF1);
writel(coeff[1], pcdev->base_emma +
PRP_CH1_RZ_VERT_COEF2);
writel(valid, pcdev->base_emma +
PRP_CH1_RZ_VERT_VALID);
}
} else {
if (dir == RESIZE_DIR_H) {
writel(coeff[0], pcdev->base_emma +
PRP_CH2_RZ_HORI_COEF1);
writel(coeff[1], pcdev->base_emma +
PRP_CH2_RZ_HORI_COEF2);
writel(valid, pcdev->base_emma +
PRP_CH2_RZ_HORI_VALID);
} else {
writel(coeff[0], pcdev->base_emma +
PRP_CH2_RZ_VERT_COEF1);
writel(coeff[1], pcdev->base_emma +
PRP_CH2_RZ_VERT_COEF2);
writel(valid, pcdev->base_emma +
PRP_CH2_RZ_VERT_VALID);
}
}
}
}
static int mx2_start_streaming(struct vb2_queue *q, unsigned int count)
{
struct soc_camera_device *icd = soc_camera_from_vb2q(q);
struct soc_camera_host *ici =
to_soc_camera_host(icd->parent);
struct mx2_camera_dev *pcdev = ici->priv;
struct mx2_fmt_cfg *prp = pcdev->emma_prp;
struct vb2_buffer *vb;
struct mx2_buffer *buf;
unsigned long phys;
int bytesperline;
unsigned long flags;
if (count < 2)
return -ENOBUFS;
spin_lock_irqsave(&pcdev->lock, flags);
buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
internal.queue);
buf->internal.bufnum = 0;
vb = &buf->vb;
phys = vb2_dma_contig_plane_dma_addr(vb, 0);
mx27_update_emma_buf(pcdev, phys, buf->internal.bufnum);
list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
internal.queue);
buf->internal.bufnum = 1;
vb = &buf->vb;
phys = vb2_dma_contig_plane_dma_addr(vb, 0);
mx27_update_emma_buf(pcdev, phys, buf->internal.bufnum);
list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
bytesperline = soc_mbus_bytes_per_line(icd->user_width,
icd->current_fmt->host_fmt);
if (bytesperline < 0) {
spin_unlock_irqrestore(&pcdev->lock, flags);
return bytesperline;
}
/*
* I didn't manage to properly enable/disable the prp
* on a per frame basis during running transfers,
* thus we allocate a buffer here and use it to
* discard frames when no buffer is available.
* Feel free to work on this ;)
*/
pcdev->discard_size = icd->user_height * bytesperline;
pcdev->discard_buffer = dma_alloc_coherent(ici->v4l2_dev.dev,
pcdev->discard_size,
&pcdev->discard_buffer_dma, GFP_ATOMIC);
if (!pcdev->discard_buffer) {
spin_unlock_irqrestore(&pcdev->lock, flags);
return -ENOMEM;
}
pcdev->buf_discard[0].discard = true;
list_add_tail(&pcdev->buf_discard[0].queue,
&pcdev->discard);
pcdev->buf_discard[1].discard = true;
list_add_tail(&pcdev->buf_discard[1].queue,
&pcdev->discard);
mx2_prp_resize_commit(pcdev);
mx27_camera_emma_buf_init(icd, bytesperline);
if (prp->cfg.channel == 1) {
writel(PRP_CNTL_CH1EN |
PRP_CNTL_CSIEN |
prp->cfg.in_fmt |
prp->cfg.out_fmt |
PRP_CNTL_CH1_LEN |
PRP_CNTL_CH1BYP |
PRP_CNTL_CH1_TSKIP(0) |
PRP_CNTL_IN_TSKIP(0),
pcdev->base_emma + PRP_CNTL);
} else {
writel(PRP_CNTL_CH2EN |
PRP_CNTL_CSIEN |
prp->cfg.in_fmt |
prp->cfg.out_fmt |
PRP_CNTL_CH2_LEN |
PRP_CNTL_CH2_TSKIP(0) |
PRP_CNTL_IN_TSKIP(0),
pcdev->base_emma + PRP_CNTL);
}
spin_unlock_irqrestore(&pcdev->lock, flags);
return 0;
}
static void mx2_stop_streaming(struct vb2_queue *q)
{
struct soc_camera_device *icd = soc_camera_from_vb2q(q);
struct soc_camera_host *ici =
to_soc_camera_host(icd->parent);
struct mx2_camera_dev *pcdev = ici->priv;
struct mx2_fmt_cfg *prp = pcdev->emma_prp;
unsigned long flags;
void *b;
u32 cntl;
spin_lock_irqsave(&pcdev->lock, flags);
cntl = readl(pcdev->base_emma + PRP_CNTL);
if (prp->cfg.channel == 1) {
writel(cntl & ~PRP_CNTL_CH1EN,
pcdev->base_emma + PRP_CNTL);
} else {
writel(cntl & ~PRP_CNTL_CH2EN,
pcdev->base_emma + PRP_CNTL);
}
INIT_LIST_HEAD(&pcdev->capture);
INIT_LIST_HEAD(&pcdev->active_bufs);
INIT_LIST_HEAD(&pcdev->discard);
b = pcdev->discard_buffer;
pcdev->discard_buffer = NULL;
spin_unlock_irqrestore(&pcdev->lock, flags);
dma_free_coherent(ici->v4l2_dev.dev,
pcdev->discard_size, b, pcdev->discard_buffer_dma);
}
static struct vb2_ops mx2_videobuf_ops = {
.queue_setup = mx2_videobuf_setup,
.buf_prepare = mx2_videobuf_prepare,
.buf_queue = mx2_videobuf_queue,
.start_streaming = mx2_start_streaming,
.stop_streaming = mx2_stop_streaming,
};
static int mx2_camera_init_videobuf(struct vb2_queue *q,
struct soc_camera_device *icd)
{
q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
q->io_modes = VB2_MMAP | VB2_USERPTR;
q->drv_priv = icd;
q->ops = &mx2_videobuf_ops;
q->mem_ops = &vb2_dma_contig_memops;
q->buf_struct_size = sizeof(struct mx2_buffer);
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
return vb2_queue_init(q);
}
#define MX2_BUS_FLAGS (V4L2_MBUS_MASTER | \
V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
V4L2_MBUS_VSYNC_ACTIVE_LOW | \
V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
V4L2_MBUS_HSYNC_ACTIVE_LOW | \
V4L2_MBUS_PCLK_SAMPLE_RISING | \
V4L2_MBUS_PCLK_SAMPLE_FALLING | \
V4L2_MBUS_DATA_ACTIVE_HIGH | \
V4L2_MBUS_DATA_ACTIVE_LOW)
static int mx27_camera_emma_prp_reset(struct mx2_camera_dev *pcdev)
{
int count = 0;
readl(pcdev->base_emma + PRP_CNTL);
writel(PRP_CNTL_SWRST, pcdev->base_emma + PRP_CNTL);
while (count++ < 100) {
if (!(readl(pcdev->base_emma + PRP_CNTL) & PRP_CNTL_SWRST))
return 0;
barrier();
udelay(1);
}
return -ETIMEDOUT;
}
static int mx2_camera_set_bus_param(struct soc_camera_device *icd)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct mx2_camera_dev *pcdev = ici->priv;
struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
unsigned long common_flags;
int ret;
int bytesperline;
u32 csicr1 = pcdev->csicr1;
ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
if (!ret) {
common_flags = soc_mbus_config_compatible(&cfg, MX2_BUS_FLAGS);
if (!common_flags) {
dev_warn(icd->parent,
"Flags incompatible: camera 0x%x, host 0x%x\n",
cfg.flags, MX2_BUS_FLAGS);
return -EINVAL;
}
} else if (ret != -ENOIOCTLCMD) {
return ret;
} else {
common_flags = MX2_BUS_FLAGS;
}
if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
(common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
if (pcdev->platform_flags & MX2_CAMERA_HSYNC_HIGH)
common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
else
common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
}
if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
(common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
if (pcdev->platform_flags & MX2_CAMERA_PCLK_SAMPLE_RISING)
common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
else
common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
}
cfg.flags = common_flags;
ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
if (ret < 0 && ret != -ENOIOCTLCMD) {
dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
common_flags, ret);
return ret;
}
csicr1 = (csicr1 & ~CSICR1_FMT_MASK) | pcdev->emma_prp->cfg.csicr1;
if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
csicr1 |= CSICR1_REDGE;
if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
csicr1 |= CSICR1_SOF_POL;
if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
csicr1 |= CSICR1_HSYNC_POL;
if (pcdev->platform_flags & MX2_CAMERA_EXT_VSYNC)
csicr1 |= CSICR1_EXT_VSYNC;
if (pcdev->platform_flags & MX2_CAMERA_CCIR)
csicr1 |= CSICR1_CCIR_EN;
if (pcdev->platform_flags & MX2_CAMERA_CCIR_INTERLACE)
csicr1 |= CSICR1_CCIR_MODE;
if (pcdev->platform_flags & MX2_CAMERA_GATED_CLOCK)
csicr1 |= CSICR1_GCLK_MODE;
if (pcdev->platform_flags & MX2_CAMERA_INV_DATA)
csicr1 |= CSICR1_INV_DATA;
pcdev->csicr1 = csicr1;
bytesperline = soc_mbus_bytes_per_line(icd->user_width,
icd->current_fmt->host_fmt);
if (bytesperline < 0)
return bytesperline;
ret = mx27_camera_emma_prp_reset(pcdev);
if (ret)
return ret;
writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
return 0;
}
static int mx2_camera_set_crop(struct soc_camera_device *icd,
const struct v4l2_crop *a)
{
struct v4l2_crop a_writable = *a;
struct v4l2_rect *rect = &a_writable.c;
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct v4l2_mbus_framefmt mf;
int ret;
soc_camera_limit_side(&rect->left, &rect->width, 0, 2, 4096);
soc_camera_limit_side(&rect->top, &rect->height, 0, 2, 4096);
ret = v4l2_subdev_call(sd, video, s_crop, a);
if (ret < 0)
return ret;
/* The capture device might have changed its output */
ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
if (ret < 0)
return ret;
dev_dbg(icd->parent, "Sensor cropped %dx%d\n",
mf.width, mf.height);
icd->user_width = mf.width;
icd->user_height = mf.height;
return ret;
}
static int mx2_camera_get_formats(struct soc_camera_device *icd,
unsigned int idx,
struct soc_camera_format_xlate *xlate)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
const struct soc_mbus_pixelfmt *fmt;
struct device *dev = icd->parent;
enum v4l2_mbus_pixelcode code;
int ret, formats = 0;
ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
if (ret < 0)
/* no more formats */
return 0;
fmt = soc_mbus_get_fmtdesc(code);
if (!fmt) {
dev_err(dev, "Invalid format code #%u: %d\n", idx, code);
return 0;
}
if (code == V4L2_MBUS_FMT_YUYV8_2X8 ||
code == V4L2_MBUS_FMT_UYVY8_2X8) {
formats++;
if (xlate) {
/*
* CH2 can output YUV420 which is a standard format in
* soc_mediabus.c
*/
xlate->host_fmt =
soc_mbus_get_fmtdesc(V4L2_MBUS_FMT_YUYV8_1_5X8);
xlate->code = code;
dev_dbg(dev, "Providing host format %s for sensor code %d\n",
xlate->host_fmt->name, code);
xlate++;
}
}
if (code == V4L2_MBUS_FMT_UYVY8_2X8) {
formats++;
if (xlate) {
xlate->host_fmt =
soc_mbus_get_fmtdesc(V4L2_MBUS_FMT_YUYV8_2X8);
xlate->code = code;
dev_dbg(dev, "Providing host format %s for sensor code %d\n",
xlate->host_fmt->name, code);
xlate++;
}
}
/* Generic pass-trough */
formats++;
if (xlate) {
xlate->host_fmt = fmt;
xlate->code = code;
xlate++;
}
return formats;
}
static int mx2_emmaprp_resize(struct mx2_camera_dev *pcdev,
struct v4l2_mbus_framefmt *mf_in,
struct v4l2_pix_format *pix_out, bool apply)
{
unsigned int num, den;
unsigned long m;
int i, dir;
for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
struct emma_prp_resize tmprsz;
unsigned char *s = tmprsz.s;
int len = 0;
int in, out;
if (dir == RESIZE_DIR_H) {
in = mf_in->width;
out = pix_out->width;
} else {
in = mf_in->height;
out = pix_out->height;
}
if (in < out)
return -EINVAL;
else if (in == out)
continue;
/* Calculate ratio */
m = gcd(in, out);
num = in / m;
den = out / m;
if (num > RESIZE_NUM_MAX)
return -EINVAL;
if ((num >= 2 * den) && (den == 1) &&
(num < 9) && (!(num & 0x01))) {
int sum = 0;
int j;
/* Average scaling for >= 2:1 ratios */
/* Support can be added for num >=9 and odd values */
tmprsz.algo = RESIZE_ALGO_AVERAGING;
len = num;
for (i = 0; i < (len / 2); i++)
s[i] = 8;
do {
for (i = 0; i < (len / 2); i++) {
s[i] = s[i] >> 1;
sum = 0;
for (j = 0; j < (len / 2); j++)
sum += s[j];
if (sum == 4)
break;
}
} while (sum != 4);
for (i = (len / 2); i < len; i++)
s[i] = s[len - i - 1];
s[len - 1] |= SZ_COEF;
} else {
/* bilinear scaling for < 2:1 ratios */
int v; /* overflow counter */
int coeff, nxt; /* table output */
int in_pos_inc = 2 * den;
int out_pos = num;
int out_pos_inc = 2 * num;
int init_carry = num - den;
int carry = init_carry;
tmprsz.algo = RESIZE_ALGO_BILINEAR;
v = den + in_pos_inc;
do {
coeff = v - out_pos;
out_pos += out_pos_inc;
carry += out_pos_inc;
for (nxt = 0; v < out_pos; nxt++) {
v += in_pos_inc;
carry -= in_pos_inc;
}
if (len > RESIZE_NUM_MAX)
return -EINVAL;
coeff = ((coeff << BC_COEF) +
(in_pos_inc >> 1)) / in_pos_inc;
if (coeff >= (SZ_COEF - 1))
coeff--;
coeff |= SZ_COEF;
s[len] = (unsigned char)coeff;
len++;
for (i = 1; i < nxt; i++) {
if (len >= RESIZE_NUM_MAX)
return -EINVAL;
s[len] = 0;
len++;
}
} while (carry != init_carry);
}
tmprsz.len = len;
if (dir == RESIZE_DIR_H)
mf_in->width = pix_out->width;
else
mf_in->height = pix_out->height;
if (apply)
memcpy(&pcdev->resizing[dir], &tmprsz, sizeof(tmprsz));
}
return 0;
}
static int mx2_camera_set_fmt(struct soc_camera_device *icd,
struct v4l2_format *f)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct mx2_camera_dev *pcdev = ici->priv;
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
const struct soc_camera_format_xlate *xlate;
struct v4l2_pix_format *pix = &f->fmt.pix;
struct v4l2_mbus_framefmt mf;
int ret;
dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
__func__, pix->width, pix->height);
xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
if (!xlate) {
dev_warn(icd->parent, "Format %x not found\n",
pix->pixelformat);
return -EINVAL;
}
mf.width = pix->width;
mf.height = pix->height;
mf.field = pix->field;
mf.colorspace = pix->colorspace;
mf.code = xlate->code;
ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
if (ret < 0 && ret != -ENOIOCTLCMD)
return ret;
/* Store width and height returned by the sensor for resizing */
pcdev->s_width = mf.width;
pcdev->s_height = mf.height;
dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
__func__, pcdev->s_width, pcdev->s_height);
pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
xlate->host_fmt->fourcc);
memset(pcdev->resizing, 0, sizeof(pcdev->resizing));
if ((mf.width != pix->width || mf.height != pix->height) &&
pcdev->emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
if (mx2_emmaprp_resize(pcdev, &mf, pix, true) < 0)
dev_dbg(icd->parent, "%s: can't resize\n", __func__);
}
if (mf.code != xlate->code)
return -EINVAL;
pix->width = mf.width;
pix->height = mf.height;
pix->field = mf.field;
pix->colorspace = mf.colorspace;
icd->current_fmt = xlate;
dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
__func__, pix->width, pix->height);
return 0;
}
static int mx2_camera_try_fmt(struct soc_camera_device *icd,
struct v4l2_format *f)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
const struct soc_camera_format_xlate *xlate;
struct v4l2_pix_format *pix = &f->fmt.pix;
struct v4l2_mbus_framefmt mf;
__u32 pixfmt = pix->pixelformat;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct mx2_camera_dev *pcdev = ici->priv;
struct mx2_fmt_cfg *emma_prp;
int ret;
dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
__func__, pix->width, pix->height);
xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
if (pixfmt && !xlate) {
dev_warn(icd->parent, "Format %x not found\n", pixfmt);
return -EINVAL;
}
/*
* limit to MX27 hardware capabilities: width must be a multiple of 8 as
* requested by the CSI. (Table 39-2 in the i.MX27 Reference Manual).
*/
pix->width &= ~0x7;
/* limit to sensor capabilities */
mf.width = pix->width;
mf.height = pix->height;
mf.field = pix->field;
mf.colorspace = pix->colorspace;
mf.code = xlate->code;
ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
if (ret < 0)
return ret;
dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
__func__, pcdev->s_width, pcdev->s_height);
/* If the sensor does not support image size try PrP resizing */
emma_prp = mx27_emma_prp_get_format(xlate->code,
xlate->host_fmt->fourcc);
if ((mf.width != pix->width || mf.height != pix->height) &&
emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
if (mx2_emmaprp_resize(pcdev, &mf, pix, false) < 0)
dev_dbg(icd->parent, "%s: can't resize\n", __func__);
}
if (mf.field == V4L2_FIELD_ANY)
mf.field = V4L2_FIELD_NONE;
/*
* Driver supports interlaced images provided they have
* both fields so that they can be processed as if they
* were progressive.
*/
if (mf.field != V4L2_FIELD_NONE && !V4L2_FIELD_HAS_BOTH(mf.field)) {
dev_err(icd->parent, "Field type %d unsupported.\n",
mf.field);
return -EINVAL;
}
pix->width = mf.width;
pix->height = mf.height;
pix->field = mf.field;
pix->colorspace = mf.colorspace;
dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
__func__, pix->width, pix->height);
return 0;
}
static int mx2_camera_querycap(struct soc_camera_host *ici,
struct v4l2_capability *cap)
{
/* cap->name is set by the friendly caller:-> */
strlcpy(cap->card, MX2_CAM_DRIVER_DESCRIPTION, sizeof(cap->card));
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
return 0;
}
static unsigned int mx2_camera_poll(struct file *file, poll_table *pt)
{
struct soc_camera_device *icd = file->private_data;
return vb2_poll(&icd->vb2_vidq, file, pt);
}
static struct soc_camera_host_ops mx2_soc_camera_host_ops = {
.owner = THIS_MODULE,
.add = mx2_camera_add_device,
.remove = mx2_camera_remove_device,
.clock_start = mx2_camera_clock_start,
.clock_stop = mx2_camera_clock_stop,
.set_fmt = mx2_camera_set_fmt,
.set_crop = mx2_camera_set_crop,
.get_formats = mx2_camera_get_formats,
.try_fmt = mx2_camera_try_fmt,
.init_videobuf2 = mx2_camera_init_videobuf,
.poll = mx2_camera_poll,
.querycap = mx2_camera_querycap,
.set_bus_param = mx2_camera_set_bus_param,
};
static void mx27_camera_frame_done_emma(struct mx2_camera_dev *pcdev,
int bufnum, bool err)
{
#ifdef DEBUG
struct mx2_fmt_cfg *prp = pcdev->emma_prp;
#endif
struct mx2_buf_internal *ibuf;
struct mx2_buffer *buf;
struct vb2_buffer *vb;
unsigned long phys;
ibuf = list_first_entry(&pcdev->active_bufs, struct mx2_buf_internal,
queue);
BUG_ON(ibuf->bufnum != bufnum);
if (ibuf->discard) {
/*
* Discard buffer must not be returned to user space.
* Just return it to the discard queue.
*/
list_move_tail(pcdev->active_bufs.next, &pcdev->discard);
} else {
buf = mx2_ibuf_to_buf(ibuf);
vb = &buf->vb;
#ifdef DEBUG
phys = vb2_dma_contig_plane_dma_addr(vb, 0);
if (prp->cfg.channel == 1) {
if (readl(pcdev->base_emma + PRP_DEST_RGB1_PTR +
4 * bufnum) != phys) {
dev_err(pcdev->dev, "%lx != %x\n", phys,
readl(pcdev->base_emma +
PRP_DEST_RGB1_PTR + 4 * bufnum));
}
} else {
if (readl(pcdev->base_emma + PRP_DEST_Y_PTR -
0x14 * bufnum) != phys) {
dev_err(pcdev->dev, "%lx != %x\n", phys,
readl(pcdev->base_emma +
PRP_DEST_Y_PTR - 0x14 * bufnum));
}
}
#endif
dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%p %lu\n", __func__, vb,
vb2_plane_vaddr(vb, 0),
vb2_get_plane_payload(vb, 0));
list_del_init(&buf->internal.queue);
v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
vb->v4l2_buf.sequence = pcdev->frame_count;
if (err)
vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
else
vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
}
pcdev->frame_count++;
if (list_empty(&pcdev->capture)) {
if (list_empty(&pcdev->discard)) {
dev_warn(pcdev->dev, "%s: trying to access empty discard list\n",
__func__);
return;
}
ibuf = list_first_entry(&pcdev->discard,
struct mx2_buf_internal, queue);
ibuf->bufnum = bufnum;
list_move_tail(pcdev->discard.next, &pcdev->active_bufs);
mx27_update_emma_buf(pcdev, pcdev->discard_buffer_dma, bufnum);
return;
}
buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
internal.queue);
buf->internal.bufnum = bufnum;
list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
vb = &buf->vb;
phys = vb2_dma_contig_plane_dma_addr(vb, 0);
mx27_update_emma_buf(pcdev, phys, bufnum);
}
static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
{
struct mx2_camera_dev *pcdev = data;
unsigned int status = readl(pcdev->base_emma + PRP_INTRSTATUS);
struct mx2_buf_internal *ibuf;
spin_lock(&pcdev->lock);
if (list_empty(&pcdev->active_bufs)) {
dev_warn(pcdev->dev, "%s: called while active list is empty\n",
__func__);
if (!status) {
spin_unlock(&pcdev->lock);
return IRQ_NONE;
}
}
if (status & (1 << 7)) { /* overflow */
u32 cntl = readl(pcdev->base_emma + PRP_CNTL);
writel(cntl & ~(PRP_CNTL_CH1EN | PRP_CNTL_CH2EN),
pcdev->base_emma + PRP_CNTL);
writel(cntl, pcdev->base_emma + PRP_CNTL);
ibuf = list_first_entry(&pcdev->active_bufs,
struct mx2_buf_internal, queue);
mx27_camera_frame_done_emma(pcdev,
ibuf->bufnum, true);
status &= ~(1 << 7);
} else if (((status & (3 << 5)) == (3 << 5)) ||
((status & (3 << 3)) == (3 << 3))) {
/*
* Both buffers have triggered, process the one we're expecting
* to first
*/
ibuf = list_first_entry(&pcdev->active_bufs,
struct mx2_buf_internal, queue);
mx27_camera_frame_done_emma(pcdev, ibuf->bufnum, false);
status &= ~(1 << (6 - ibuf->bufnum)); /* mark processed */
} else if ((status & (1 << 6)) || (status & (1 << 4))) {
mx27_camera_frame_done_emma(pcdev, 0, false);
} else if ((status & (1 << 5)) || (status & (1 << 3))) {
mx27_camera_frame_done_emma(pcdev, 1, false);
}
spin_unlock(&pcdev->lock);
writel(status, pcdev->base_emma + PRP_INTRSTATUS);
return IRQ_HANDLED;
}
static int mx27_camera_emma_init(struct platform_device *pdev)
{
struct mx2_camera_dev *pcdev = platform_get_drvdata(pdev);
struct resource *res_emma;
int irq_emma;
int err = 0;
res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
irq_emma = platform_get_irq(pdev, 1);
if (!res_emma || !irq_emma) {
dev_err(pcdev->dev, "no EMMA resources\n");
err = -ENODEV;
goto out;
}
pcdev->base_emma = devm_ioremap_resource(pcdev->dev, res_emma);
if (IS_ERR(pcdev->base_emma)) {
err = PTR_ERR(pcdev->base_emma);
goto out;
}
err = devm_request_irq(pcdev->dev, irq_emma, mx27_camera_emma_irq, 0,
MX2_CAM_DRV_NAME, pcdev);
if (err) {
dev_err(pcdev->dev, "Camera EMMA interrupt register failed\n");
goto out;
}
pcdev->clk_emma_ipg = devm_clk_get(pcdev->dev, "emma-ipg");
if (IS_ERR(pcdev->clk_emma_ipg)) {
err = PTR_ERR(pcdev->clk_emma_ipg);
goto out;
}
clk_prepare_enable(pcdev->clk_emma_ipg);
pcdev->clk_emma_ahb = devm_clk_get(pcdev->dev, "emma-ahb");
if (IS_ERR(pcdev->clk_emma_ahb)) {
err = PTR_ERR(pcdev->clk_emma_ahb);
goto exit_clk_emma_ipg;
}
clk_prepare_enable(pcdev->clk_emma_ahb);
err = mx27_camera_emma_prp_reset(pcdev);
if (err)
goto exit_clk_emma_ahb;
return err;
exit_clk_emma_ahb:
clk_disable_unprepare(pcdev->clk_emma_ahb);
exit_clk_emma_ipg:
clk_disable_unprepare(pcdev->clk_emma_ipg);
out:
return err;
}
static int mx2_camera_probe(struct platform_device *pdev)
{
struct mx2_camera_dev *pcdev;
struct resource *res_csi;
int irq_csi;
int err = 0;
dev_dbg(&pdev->dev, "initialising\n");
res_csi = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq_csi = platform_get_irq(pdev, 0);
if (res_csi == NULL || irq_csi < 0) {
dev_err(&pdev->dev, "Missing platform resources data\n");
err = -ENODEV;
goto exit;
}
pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
if (!pcdev) {
dev_err(&pdev->dev, "Could not allocate pcdev\n");
err = -ENOMEM;
goto exit;
}
pcdev->clk_csi_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(pcdev->clk_csi_ahb)) {
dev_err(&pdev->dev, "Could not get csi ahb clock\n");
err = PTR_ERR(pcdev->clk_csi_ahb);
goto exit;
}
pcdev->clk_csi_per = devm_clk_get(&pdev->dev, "per");
if (IS_ERR(pcdev->clk_csi_per)) {
dev_err(&pdev->dev, "Could not get csi per clock\n");
err = PTR_ERR(pcdev->clk_csi_per);
goto exit;
}
pcdev->pdata = pdev->dev.platform_data;
if (pcdev->pdata) {
long rate;
pcdev->platform_flags = pcdev->pdata->flags;
rate = clk_round_rate(pcdev->clk_csi_per,
pcdev->pdata->clk * 2);
if (rate <= 0) {
err = -ENODEV;
goto exit;
}
err = clk_set_rate(pcdev->clk_csi_per, rate);
if (err < 0)
goto exit;
}
INIT_LIST_HEAD(&pcdev->capture);
INIT_LIST_HEAD(&pcdev->active_bufs);
INIT_LIST_HEAD(&pcdev->discard);
spin_lock_init(&pcdev->lock);
pcdev->base_csi = devm_ioremap_resource(&pdev->dev, res_csi);
if (IS_ERR(pcdev->base_csi)) {
err = PTR_ERR(pcdev->base_csi);
goto exit;
}
pcdev->dev = &pdev->dev;
platform_set_drvdata(pdev, pcdev);
err = mx27_camera_emma_init(pdev);
if (err)
goto exit;
/*
* We're done with drvdata here. Clear the pointer so that
* v4l2 core can start using drvdata on its purpose.
*/
platform_set_drvdata(pdev, NULL);
pcdev->soc_host.drv_name = MX2_CAM_DRV_NAME,
pcdev->soc_host.ops = &mx2_soc_camera_host_ops,
pcdev->soc_host.priv = pcdev;
pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
pcdev->soc_host.nr = pdev->id;
pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
if (IS_ERR(pcdev->alloc_ctx)) {
err = PTR_ERR(pcdev->alloc_ctx);
goto eallocctx;
}
err = soc_camera_host_register(&pcdev->soc_host);
if (err)
goto exit_free_emma;
dev_info(&pdev->dev, "MX2 Camera (CSI) driver probed, clock frequency: %ld\n",
clk_get_rate(pcdev->clk_csi_per));
return 0;
exit_free_emma:
vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
eallocctx:
clk_disable_unprepare(pcdev->clk_emma_ipg);
clk_disable_unprepare(pcdev->clk_emma_ahb);
exit:
return err;
}
static int mx2_camera_remove(struct platform_device *pdev)
{
struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
struct mx2_camera_dev *pcdev = container_of(soc_host,
struct mx2_camera_dev, soc_host);
soc_camera_host_unregister(&pcdev->soc_host);
vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
clk_disable_unprepare(pcdev->clk_emma_ipg);
clk_disable_unprepare(pcdev->clk_emma_ahb);
dev_info(&pdev->dev, "MX2 Camera driver unloaded\n");
return 0;
}
static struct platform_driver mx2_camera_driver = {
.driver = {
.name = MX2_CAM_DRV_NAME,
},
.id_table = mx2_camera_devtype,
.remove = mx2_camera_remove,
};
module_platform_driver_probe(mx2_camera_driver, mx2_camera_probe);
MODULE_DESCRIPTION("i.MX27 SoC Camera Host driver");
MODULE_AUTHOR("Sascha Hauer <sha@pengutronix.de>");
MODULE_LICENSE("GPL");
MODULE_VERSION(MX2_CAM_VERSION);