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* Support for Medifield PNW Camera Imaging ISP subsystem.
*
* Copyright (c) 2010 Intel Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
#include <media/v4l2-event.h>
#include <media/v4l2-mediabus.h>
#include "atomisp_cmd.h"
#include "atomisp_internal.h"
#include "atomisp-regs.h"
static struct v4l2_mbus_framefmt *__csi2_get_format(struct
atomisp_mipi_csi2_device
*csi2,
struct
v4l2_subdev_pad_config *cfg,
enum
v4l2_subdev_format_whence
which, unsigned int pad)
{
if (which == V4L2_SUBDEV_FORMAT_TRY)
return v4l2_subdev_get_try_format(&csi2->subdev, cfg, pad);
else
return &csi2->formats[pad];
}
/*
* csi2_enum_mbus_code - Handle pixel format enumeration
* @sd : pointer to v4l2 subdev structure
* @fh : V4L2 subdev file handle
* @code : pointer to v4l2_subdev_pad_mbus_code_enum structure
* return -EINVAL or zero on success
*/
static int csi2_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code)
{
const struct atomisp_in_fmt_conv *ic = atomisp_in_fmt_conv;
unsigned int i = 0;
while (ic->code) {
if (i == code->index) {
code->code = ic->code;
return 0;
}
i++, ic++;
}
return -EINVAL;
}
/*
* csi2_get_format - Handle get format by pads subdev method
* @sd : pointer to v4l2 subdev structure
* @fh : V4L2 subdev file handle
* @pad: pad num
* @fmt: pointer to v4l2 format structure
* return -EINVAL or zero on sucess
*/
static int csi2_get_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *fmt)
{
struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
struct v4l2_mbus_framefmt *format;
format = __csi2_get_format(csi2, cfg, fmt->which, fmt->pad);
fmt->format = *format;
return 0;
}
int atomisp_csi2_set_ffmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
unsigned int which, uint16_t pad,
struct v4l2_mbus_framefmt *ffmt)
{
struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
struct v4l2_mbus_framefmt *actual_ffmt =
#ifndef ISP2401
__csi2_get_format(csi2, cfg, which, pad);
#else
__csi2_get_format(csi2, cfg, which, pad);
#endif
if (pad == CSI2_PAD_SINK) {
const struct atomisp_in_fmt_conv *ic;
struct v4l2_mbus_framefmt tmp_ffmt;
ic = atomisp_find_in_fmt_conv(ffmt->code);
if (ic)
actual_ffmt->code = ic->code;
else
actual_ffmt->code = atomisp_in_fmt_conv[0].code;
actual_ffmt->width = clamp_t(
u32, ffmt->width, ATOM_ISP_MIN_WIDTH,
ATOM_ISP_MAX_WIDTH);
actual_ffmt->height = clamp_t(
u32, ffmt->height, ATOM_ISP_MIN_HEIGHT,
ATOM_ISP_MAX_HEIGHT);
tmp_ffmt = *ffmt = *actual_ffmt;
return atomisp_csi2_set_ffmt(sd, cfg, which, CSI2_PAD_SOURCE,
&tmp_ffmt);
}
/* FIXME: DPCM decompression */
*actual_ffmt = *ffmt =
#ifndef ISP2401
*__csi2_get_format(csi2, cfg, which, CSI2_PAD_SINK);
#else
*__csi2_get_format(csi2, cfg, which, CSI2_PAD_SINK);
#endif
return 0;
}
/*
* csi2_set_format - Handle set format by pads subdev method
* @sd : pointer to v4l2 subdev structure
* @fh : V4L2 subdev file handle
* @pad: pad num
* @fmt: pointer to v4l2 format structure
* return -EINVAL or zero on success
*/
static int csi2_set_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *fmt)
{
return atomisp_csi2_set_ffmt(sd, cfg, fmt->which, fmt->pad,
&fmt->format);
}
/*
* csi2_set_stream - Enable/Disable streaming on the CSI2 module
* @sd: ISP CSI2 V4L2 subdevice
* @enable: Enable/disable stream (1/0)
*
* Return 0 on success or a negative error code otherwise.
*/
static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
{
return 0;
}
/* subdev core operations */
static const struct v4l2_subdev_core_ops csi2_core_ops = {
};
/* subdev video operations */
static const struct v4l2_subdev_video_ops csi2_video_ops = {
.s_stream = csi2_set_stream,
};
/* subdev pad operations */
static const struct v4l2_subdev_pad_ops csi2_pad_ops = {
.enum_mbus_code = csi2_enum_mbus_code,
.get_fmt = csi2_get_format,
.set_fmt = csi2_set_format,
.link_validate = v4l2_subdev_link_validate_default,
};
/* subdev operations */
static const struct v4l2_subdev_ops csi2_ops = {
.core = &csi2_core_ops,
.video = &csi2_video_ops,
.pad = &csi2_pad_ops,
};
#ifndef ISP2401
#endif
/*
* csi2_link_setup - Setup CSI2 connections.
* @entity : Pointer to media entity structure
* @local : Pointer to local pad array
* @remote : Pointer to remote pad array
* @flags : Link flags
* return -EINVAL or zero on success
*/
static int csi2_link_setup(struct media_entity *entity,
const struct media_pad *local,
const struct media_pad *remote, u32 flags)
{
struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
u32 result = local->index | is_media_entity_v4l2_subdev(remote->entity);
switch (result) {
case CSI2_PAD_SOURCE | MEDIA_ENT_F_OLD_BASE:
/* not supported yet */
return -EINVAL;
case CSI2_PAD_SOURCE | MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN:
if (flags & MEDIA_LNK_FL_ENABLED) {
if (csi2->output & ~CSI2_OUTPUT_ISP_SUBDEV)
return -EBUSY;
csi2->output |= CSI2_OUTPUT_ISP_SUBDEV;
} else {
csi2->output &= ~CSI2_OUTPUT_ISP_SUBDEV;
}
break;
default:
/* Link from camera to CSI2 is fixed... */
return -EINVAL;
}
return 0;
}
/* media operations */
static const struct media_entity_operations csi2_media_ops = {
.link_setup = csi2_link_setup,
.link_validate = v4l2_subdev_link_validate,
};
/*
* ispcsi2_init_entities - Initialize subdev and media entity.
* @csi2: Pointer to ispcsi2 structure.
* return -ENOMEM or zero on success
*/
static int mipi_csi2_init_entities(struct atomisp_mipi_csi2_device *csi2,
int port)
{
struct v4l2_subdev *sd = &csi2->subdev;
struct media_pad *pads = csi2->pads;
struct media_entity *me = &sd->entity;
int ret;
v4l2_subdev_init(sd, &csi2_ops);
snprintf(sd->name, sizeof(sd->name), "ATOM ISP CSI2-port%d", port);
v4l2_set_subdevdata(sd, csi2);
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
pads[CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
pads[CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
me->ops = &csi2_media_ops;
me->function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
ret = media_entity_pads_init(me, CSI2_PADS_NUM, pads);
if (ret < 0)
return ret;
csi2->formats[CSI2_PAD_SINK].code =
csi2->formats[CSI2_PAD_SOURCE].code =
atomisp_in_fmt_conv[0].code;
return 0;
}
void
atomisp_mipi_csi2_unregister_entities(struct atomisp_mipi_csi2_device *csi2)
{
media_entity_cleanup(&csi2->subdev.entity);
v4l2_device_unregister_subdev(&csi2->subdev);
}
int atomisp_mipi_csi2_register_entities(struct atomisp_mipi_csi2_device *csi2,
struct v4l2_device *vdev)
{
int ret;
/* Register the subdev and video nodes. */
ret = v4l2_device_register_subdev(vdev, &csi2->subdev);
if (ret < 0)
goto error;
return 0;
error:
atomisp_mipi_csi2_unregister_entities(csi2);
return ret;
}
static const int LIMIT_SHIFT = 6; /* Limit numeric range into 31 bits */
static int
atomisp_csi2_configure_calc(const short int coeffs[2], int mipi_freq, int def)
{
/* Delay counter accuracy, 1/0.0625 for ANN/CHT, 1/0.125 for BXT */
static const int accinv = 16; /* 1 / COUNT_ACC */
int r;
if (mipi_freq >> LIMIT_SHIFT <= 0)
return def;
r = accinv * coeffs[1] * (500000000 >> LIMIT_SHIFT);
r /= mipi_freq >> LIMIT_SHIFT;
r += accinv * coeffs[0];
return r;
}
static void atomisp_csi2_configure_isp2401(struct atomisp_sub_device *asd)
{
/*
* The ISP2401 new input system CSI2+ receiver has several
* parameters affecting the receiver timings. These depend
* on the MIPI bus frequency F in Hz (sensor transmitter rate)
* as follows:
* register value = (A/1e9 + B * UI) / COUNT_ACC
* where
* UI = 1 / (2 * F) in seconds
* COUNT_ACC = counter accuracy in seconds
* For ANN and CHV, COUNT_ACC = 0.0625 ns
* For BXT, COUNT_ACC = 0.125 ns
* A and B are coefficients from the table below,
* depending whether the register minimum or maximum value is
* calculated.
* Minimum Maximum
* Clock lane A B A B
* reg_rx_csi_dly_cnt_termen_clane 0 0 38 0
* reg_rx_csi_dly_cnt_settle_clane 95 -8 300 -16
* Data lanes
* reg_rx_csi_dly_cnt_termen_dlane0 0 0 35 4
* reg_rx_csi_dly_cnt_settle_dlane0 85 -2 145 -6
* reg_rx_csi_dly_cnt_termen_dlane1 0 0 35 4
* reg_rx_csi_dly_cnt_settle_dlane1 85 -2 145 -6
* reg_rx_csi_dly_cnt_termen_dlane2 0 0 35 4
* reg_rx_csi_dly_cnt_settle_dlane2 85 -2 145 -6
* reg_rx_csi_dly_cnt_termen_dlane3 0 0 35 4
* reg_rx_csi_dly_cnt_settle_dlane3 85 -2 145 -6
*
* We use the minimum values in the calculations below.
*/
static const short int coeff_clk_termen[] = { 0, 0 };
static const short int coeff_clk_settle[] = { 95, -8 };
static const short int coeff_dat_termen[] = { 0, 0 };
static const short int coeff_dat_settle[] = { 85, -2 };
static const int TERMEN_DEFAULT = 0 * 0;
static const int SETTLE_DEFAULT = 0x480;
static const hrt_address csi2_port_base[] = {
[ATOMISP_CAMERA_PORT_PRIMARY] = CSI2_PORT_A_BASE,
[ATOMISP_CAMERA_PORT_SECONDARY] = CSI2_PORT_B_BASE,
[ATOMISP_CAMERA_PORT_TERTIARY] = CSI2_PORT_C_BASE,
};
/* Number of lanes on each port, excluding clock lane */
static const unsigned char csi2_port_lanes[] = {
[ATOMISP_CAMERA_PORT_PRIMARY] = 4,
[ATOMISP_CAMERA_PORT_SECONDARY] = 2,
[ATOMISP_CAMERA_PORT_TERTIARY] = 2,
};
static const hrt_address csi2_lane_base[] = {
CSI2_LANE_CL_BASE,
CSI2_LANE_D0_BASE,
CSI2_LANE_D1_BASE,
CSI2_LANE_D2_BASE,
CSI2_LANE_D3_BASE,
};
int clk_termen;
int clk_settle;
int dat_termen;
int dat_settle;
struct v4l2_control ctrl;
struct atomisp_device *isp = asd->isp;
struct camera_mipi_info *mipi_info;
int mipi_freq = 0;
enum atomisp_camera_port port;
int n;
mipi_info = atomisp_to_sensor_mipi_info(
isp->inputs[asd->input_curr].camera);
port = mipi_info->port;
ctrl.id = V4L2_CID_LINK_FREQ;
if (v4l2_g_ctrl
(isp->inputs[asd->input_curr].camera->ctrl_handler, &ctrl) == 0)
mipi_freq = ctrl.value;
clk_termen = atomisp_csi2_configure_calc(coeff_clk_termen,
mipi_freq, TERMEN_DEFAULT);
clk_settle = atomisp_csi2_configure_calc(coeff_clk_settle,
mipi_freq, SETTLE_DEFAULT);
dat_termen = atomisp_csi2_configure_calc(coeff_dat_termen,
mipi_freq, TERMEN_DEFAULT);
dat_settle = atomisp_csi2_configure_calc(coeff_dat_settle,
mipi_freq, SETTLE_DEFAULT);
for (n = 0; n < csi2_port_lanes[port] + 1; n++) {
hrt_address base = csi2_port_base[port] + csi2_lane_base[n];
atomisp_store_uint32(base + CSI2_REG_RX_CSI_DLY_CNT_TERMEN,
n == 0 ? clk_termen : dat_termen);
atomisp_store_uint32(base + CSI2_REG_RX_CSI_DLY_CNT_SETTLE,
n == 0 ? clk_settle : dat_settle);
}
}
void atomisp_csi2_configure(struct atomisp_sub_device *asd)
{
if (IS_HWREVISION(asd->isp, ATOMISP_HW_REVISION_ISP2401))
atomisp_csi2_configure_isp2401(asd);
}
/*
* atomisp_mipi_csi2_cleanup - Routine for module driver cleanup
*/
void atomisp_mipi_csi2_cleanup(struct atomisp_device *isp)
{
}
#ifndef ISP2401
#endif
int atomisp_mipi_csi2_init(struct atomisp_device *isp)
{
struct atomisp_mipi_csi2_device *csi2_port;
unsigned int i;
int ret;
for (i = 0; i < ATOMISP_CAMERA_NR_PORTS; i++) {
csi2_port = &isp->csi2_port[i];
csi2_port->isp = isp;
ret = mipi_csi2_init_entities(csi2_port, i);
if (ret < 0)
goto fail;
}
return 0;
fail:
atomisp_mipi_csi2_cleanup(isp);
return ret;
}
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