LXR linux/drivers/staging/media/atomisp/pci/atomisp

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Support for Medifield PNW Camera Imaging ISP subsystem.
   4 *
   5 * Copyright (c) 2010 Intel Corporation. All Rights Reserved.
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License version
   9 * 2 as published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 *
  17 */
  18
  19#include <media/v4l2-event.h>
  20#include <media/v4l2-mediabus.h>
  21#include "atomisp_cmd.h"
  22#include "atomisp_internal.h"
  23#include "atomisp-regs.h"
  24
  25static struct v4l2_mbus_framefmt *__csi2_get_format(struct
  26        atomisp_mipi_csi2_device
  27        * csi2,
  28        struct v4l2_subdev_state *sd_state,
  29        enum
  30        v4l2_subdev_format_whence
  31        which, unsigned int pad) {
  32        if (which == V4L2_SUBDEV_FORMAT_TRY)
  33                return v4l2_subdev_get_try_format(&csi2->subdev, sd_state,
  34                                                  pad);
  35        else
  36                return &csi2->formats[pad];
  37}
  38
  39/*
  40 * csi2_enum_mbus_code - Handle pixel format enumeration
  41 * @sd     : pointer to v4l2 subdev structure
  42 * @fh     : V4L2 subdev file handle
  43 * @code   : pointer to v4l2_subdev_pad_mbus_code_enum structure
  44 * return -EINVAL or zero on success
  45*/
  46static int csi2_enum_mbus_code(struct v4l2_subdev *sd,
  47                               struct v4l2_subdev_state *sd_state,
  48                               struct v4l2_subdev_mbus_code_enum *code)
  49{
  50        const struct atomisp_in_fmt_conv *ic = atomisp_in_fmt_conv;
  51        unsigned int i = 0;
  52
  53        while (ic->code) {
  54                if (i == code->index) {
  55                        code->code = ic->code;
  56                        return 0;
  57                }
  58                i++, ic++;
  59        }
  60
  61        return -EINVAL;
  62}
  63
  64/*
  65 * csi2_get_format - Handle get format by pads subdev method
  66 * @sd : pointer to v4l2 subdev structure
  67 * @fh : V4L2 subdev file handle
  68 * @pad: pad num
  69 * @fmt: pointer to v4l2 format structure
  70 * return -EINVAL or zero on success
  71*/
  72static int csi2_get_format(struct v4l2_subdev *sd,
  73                           struct v4l2_subdev_state *sd_state,
  74                           struct v4l2_subdev_format *fmt)
  75{
  76        struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
  77        struct v4l2_mbus_framefmt *format;
  78
  79        format = __csi2_get_format(csi2, sd_state, fmt->which, fmt->pad);
  80
  81        fmt->format = *format;
  82
  83        return 0;
  84}
  85
  86int atomisp_csi2_set_ffmt(struct v4l2_subdev *sd,
  87                          struct v4l2_subdev_state *sd_state,
  88                          unsigned int which, uint16_t pad,
  89                          struct v4l2_mbus_framefmt *ffmt)
  90{
  91        struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
  92        struct v4l2_mbus_framefmt *actual_ffmt = __csi2_get_format(csi2,
  93                                                                   sd_state,
  94                                                                   which, pad);
  95
  96        if (pad == CSI2_PAD_SINK) {
  97                const struct atomisp_in_fmt_conv *ic;
  98                struct v4l2_mbus_framefmt tmp_ffmt;
  99
 100                ic = atomisp_find_in_fmt_conv(ffmt->code);
 101                if (ic)
 102                        actual_ffmt->code = ic->code;
 103                else
 104                        actual_ffmt->code = atomisp_in_fmt_conv[0].code;
 105
 106                actual_ffmt->width = clamp_t(
 107                                         u32, ffmt->width, ATOM_ISP_MIN_WIDTH,
 108                                         ATOM_ISP_MAX_WIDTH);
 109                actual_ffmt->height = clamp_t(
 110                                          u32, ffmt->height, ATOM_ISP_MIN_HEIGHT,
 111                                          ATOM_ISP_MAX_HEIGHT);
 112
 113                tmp_ffmt = *ffmt = *actual_ffmt;
 114
 115                return atomisp_csi2_set_ffmt(sd, sd_state, which,
 116                                             CSI2_PAD_SOURCE,
 117                                             &tmp_ffmt);
 118        }
 119
 120        /* FIXME: DPCM decompression */
 121        *actual_ffmt = *ffmt = *__csi2_get_format(csi2, sd_state, which,
 122                                                  CSI2_PAD_SINK);
 123
 124        return 0;
 125}
 126
 127/*
 128 * csi2_set_format - Handle set format by pads subdev method
 129 * @sd : pointer to v4l2 subdev structure
 130 * @fh : V4L2 subdev file handle
 131 * @pad: pad num
 132 * @fmt: pointer to v4l2 format structure
 133 * return -EINVAL or zero on success
 134*/
 135static int csi2_set_format(struct v4l2_subdev *sd,
 136                           struct v4l2_subdev_state *sd_state,
 137                           struct v4l2_subdev_format *fmt)
 138{
 139        return atomisp_csi2_set_ffmt(sd, sd_state, fmt->which, fmt->pad,
 140                                     &fmt->format);
 141}
 142
 143/*
 144 * csi2_set_stream - Enable/Disable streaming on the CSI2 module
 145 * @sd: ISP CSI2 V4L2 subdevice
 146 * @enable: Enable/disable stream (1/0)
 147 *
 148 * Return 0 on success or a negative error code otherwise.
 149*/
 150static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
 151{
 152        return 0;
 153}
 154
 155/* subdev core operations */
 156static const struct v4l2_subdev_core_ops csi2_core_ops = {
 157};
 158
 159/* subdev video operations */
 160static const struct v4l2_subdev_video_ops csi2_video_ops = {
 161        .s_stream = csi2_set_stream,
 162};
 163
 164/* subdev pad operations */
 165static const struct v4l2_subdev_pad_ops csi2_pad_ops = {
 166        .enum_mbus_code = csi2_enum_mbus_code,
 167        .get_fmt = csi2_get_format,
 168        .set_fmt = csi2_set_format,
 169        .link_validate = v4l2_subdev_link_validate_default,
 170};
 171
 172/* subdev operations */
 173static const struct v4l2_subdev_ops csi2_ops = {
 174        .core = &csi2_core_ops,
 175        .video = &csi2_video_ops,
 176        .pad = &csi2_pad_ops,
 177};
 178
 179/*
 180 * csi2_link_setup - Setup CSI2 connections.
 181 * @entity : Pointer to media entity structure
 182 * @local  : Pointer to local pad array
 183 * @remote : Pointer to remote pad array
 184 * @flags  : Link flags
 185 * return -EINVAL or zero on success
 186*/
 187static int csi2_link_setup(struct media_entity *entity,
 188                           const struct media_pad *local,
 189                           const struct media_pad *remote, u32 flags)
 190{
 191        struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
 192        struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
 193        u32 result = local->index | is_media_entity_v4l2_subdev(remote->entity);
 194
 195        switch (result) {
 196        case CSI2_PAD_SOURCE | MEDIA_ENT_F_OLD_BASE:
 197                /* not supported yet */
 198                return -EINVAL;
 199
 200        case CSI2_PAD_SOURCE | MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN:
 201                if (flags & MEDIA_LNK_FL_ENABLED) {
 202                        if (csi2->output & ~CSI2_OUTPUT_ISP_SUBDEV)
 203                                return -EBUSY;
 204                        csi2->output |= CSI2_OUTPUT_ISP_SUBDEV;
 205                } else {
 206                        csi2->output &= ~CSI2_OUTPUT_ISP_SUBDEV;
 207                }
 208                break;
 209
 210        default:
 211                /* Link from camera to CSI2 is fixed... */
 212                return -EINVAL;
 213        }
 214        return 0;
 215}
 216
 217/* media operations */
 218static const struct media_entity_operations csi2_media_ops = {
 219        .link_setup = csi2_link_setup,
 220        .link_validate = v4l2_subdev_link_validate,
 221};
 222
 223/*
 224* ispcsi2_init_entities - Initialize subdev and media entity.
 225* @csi2: Pointer to ispcsi2 structure.
 226* return -ENOMEM or zero on success
 227*/
 228static int mipi_csi2_init_entities(struct atomisp_mipi_csi2_device *csi2,
 229                                   int port)
 230{
 231        struct v4l2_subdev *sd = &csi2->subdev;
 232        struct media_pad *pads = csi2->pads;
 233        struct media_entity *me = &sd->entity;
 234        int ret;
 235
 236        v4l2_subdev_init(sd, &csi2_ops);
 237        snprintf(sd->name, sizeof(sd->name), "ATOM ISP CSI2-port%d", port);
 238
 239        v4l2_set_subdevdata(sd, csi2);
 240        sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 241
 242        pads[CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
 243        pads[CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
 244
 245        me->ops = &csi2_media_ops;
 246        me->function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
 247        ret = media_entity_pads_init(me, CSI2_PADS_NUM, pads);
 248        if (ret < 0)
 249                return ret;
 250
 251        csi2->formats[CSI2_PAD_SINK].code =
 252            csi2->formats[CSI2_PAD_SOURCE].code =
 253                atomisp_in_fmt_conv[0].code;
 254
 255        return 0;
 256}
 257
 258void
 259atomisp_mipi_csi2_unregister_entities(struct atomisp_mipi_csi2_device *csi2)
 260{
 261        media_entity_cleanup(&csi2->subdev.entity);
 262        v4l2_device_unregister_subdev(&csi2->subdev);
 263}
 264
 265int atomisp_mipi_csi2_register_entities(struct atomisp_mipi_csi2_device *csi2,
 266                                        struct v4l2_device *vdev)
 267{
 268        int ret;
 269
 270        /* Register the subdev and video nodes. */
 271        ret = v4l2_device_register_subdev(vdev, &csi2->subdev);
 272        if (ret < 0)
 273                goto error;
 274
 275        return 0;
 276
 277error:
 278        atomisp_mipi_csi2_unregister_entities(csi2);
 279        return ret;
 280}
 281
 282static const int LIMIT_SHIFT = 6;       /* Limit numeric range into 31 bits */
 283
 284static int
 285atomisp_csi2_configure_calc(const short int coeffs[2], int mipi_freq, int def)
 286{
 287        /* Delay counter accuracy, 1/0.0625 for ANN/CHT, 1/0.125 for BXT */
 288        static const int accinv = 16;           /* 1 / COUNT_ACC */
 289        int r;
 290
 291        if (mipi_freq >> LIMIT_SHIFT <= 0)
 292                return def;
 293
 294        r = accinv * coeffs[1] * (500000000 >> LIMIT_SHIFT);
 295        r /= mipi_freq >> LIMIT_SHIFT;
 296        r += accinv * coeffs[0];
 297
 298        return r;
 299}
 300
 301static void atomisp_csi2_configure_isp2401(struct atomisp_sub_device *asd)
 302{
 303        /*
 304         * The ISP2401 new input system CSI2+ receiver has several
 305         * parameters affecting the receiver timings. These depend
 306         * on the MIPI bus frequency F in Hz (sensor transmitter rate)
 307         * as follows:
 308         *      register value = (A/1e9 + B * UI) / COUNT_ACC
 309         * where
 310         *      UI = 1 / (2 * F) in seconds
 311         *      COUNT_ACC = counter accuracy in seconds
 312         *      For ANN and CHV, COUNT_ACC = 0.0625 ns
 313         *      For BXT,  COUNT_ACC = 0.125 ns
 314         * A and B are coefficients from the table below,
 315         * depending whether the register minimum or maximum value is
 316         * calculated.
 317         *                                     Minimum     Maximum
 318         * Clock lane                          A     B     A     B
 319         * reg_rx_csi_dly_cnt_termen_clane     0     0    38     0
 320         * reg_rx_csi_dly_cnt_settle_clane    95    -8   300   -16
 321         * Data lanes
 322         * reg_rx_csi_dly_cnt_termen_dlane0    0     0    35     4
 323         * reg_rx_csi_dly_cnt_settle_dlane0   85    -2   145    -6
 324         * reg_rx_csi_dly_cnt_termen_dlane1    0     0    35     4
 325         * reg_rx_csi_dly_cnt_settle_dlane1   85    -2   145    -6
 326         * reg_rx_csi_dly_cnt_termen_dlane2    0     0    35     4
 327         * reg_rx_csi_dly_cnt_settle_dlane2   85    -2   145    -6
 328         * reg_rx_csi_dly_cnt_termen_dlane3    0     0    35     4
 329         * reg_rx_csi_dly_cnt_settle_dlane3   85    -2   145    -6
 330         *
 331         * We use the minimum values in the calculations below.
 332         */
 333        static const short int coeff_clk_termen[] = { 0, 0 };
 334        static const short int coeff_clk_settle[] = { 95, -8 };
 335        static const short int coeff_dat_termen[] = { 0, 0 };
 336        static const short int coeff_dat_settle[] = { 85, -2 };
 337        static const int TERMEN_DEFAULT           = 0 * 0;
 338        static const int SETTLE_DEFAULT           = 0x480;
 339
 340        static const hrt_address csi2_port_base[] = {
 341                [ATOMISP_CAMERA_PORT_PRIMARY]     = CSI2_PORT_A_BASE,
 342                [ATOMISP_CAMERA_PORT_SECONDARY]   = CSI2_PORT_B_BASE,
 343                [ATOMISP_CAMERA_PORT_TERTIARY]    = CSI2_PORT_C_BASE,
 344        };
 345        /* Number of lanes on each port, excluding clock lane */
 346        static const unsigned char csi2_port_lanes[] = {
 347                [ATOMISP_CAMERA_PORT_PRIMARY]     = 4,
 348                [ATOMISP_CAMERA_PORT_SECONDARY]   = 2,
 349                [ATOMISP_CAMERA_PORT_TERTIARY]    = 2,
 350        };
 351        static const hrt_address csi2_lane_base[] = {
 352                CSI2_LANE_CL_BASE,
 353                CSI2_LANE_D0_BASE,
 354                CSI2_LANE_D1_BASE,
 355                CSI2_LANE_D2_BASE,
 356                CSI2_LANE_D3_BASE,
 357        };
 358
 359        int clk_termen;
 360        int clk_settle;
 361        int dat_termen;
 362        int dat_settle;
 363
 364        struct v4l2_control ctrl;
 365        struct atomisp_device *isp = asd->isp;
 366        struct camera_mipi_info *mipi_info;
 367        int mipi_freq = 0;
 368        enum atomisp_camera_port port;
 369
 370        int n;
 371
 372        mipi_info = atomisp_to_sensor_mipi_info(
 373                        isp->inputs[asd->input_curr].camera);
 374        port = mipi_info->port;
 375
 376        ctrl.id = V4L2_CID_LINK_FREQ;
 377        if (v4l2_g_ctrl
 378            (isp->inputs[asd->input_curr].camera->ctrl_handler, &ctrl) == 0)
 379                mipi_freq = ctrl.value;
 380
 381        clk_termen = atomisp_csi2_configure_calc(coeff_clk_termen,
 382                     mipi_freq, TERMEN_DEFAULT);
 383        clk_settle = atomisp_csi2_configure_calc(coeff_clk_settle,
 384                     mipi_freq, SETTLE_DEFAULT);
 385        dat_termen = atomisp_csi2_configure_calc(coeff_dat_termen,
 386                     mipi_freq, TERMEN_DEFAULT);
 387        dat_settle = atomisp_csi2_configure_calc(coeff_dat_settle,
 388                     mipi_freq, SETTLE_DEFAULT);
 389        for (n = 0; n < csi2_port_lanes[port] + 1; n++) {
 390                hrt_address base = csi2_port_base[port] + csi2_lane_base[n];
 391
 392                atomisp_css2_hw_store_32(base + CSI2_REG_RX_CSI_DLY_CNT_TERMEN,
 393                                     n == 0 ? clk_termen : dat_termen);
 394                atomisp_css2_hw_store_32(base + CSI2_REG_RX_CSI_DLY_CNT_SETTLE,
 395                                     n == 0 ? clk_settle : dat_settle);
 396        }
 397}
 398
 399void atomisp_csi2_configure(struct atomisp_sub_device *asd)
 400{
 401        if (IS_HWREVISION(asd->isp, ATOMISP_HW_REVISION_ISP2401))
 402                atomisp_csi2_configure_isp2401(asd);
 403}
 404
 405/*
 406 * atomisp_mipi_csi2_cleanup - Routine for module driver cleanup
 407*/
 408void atomisp_mipi_csi2_cleanup(struct atomisp_device *isp)
 409{
 410}
 411
 412int atomisp_mipi_csi2_init(struct atomisp_device *isp)
 413{
 414        struct atomisp_mipi_csi2_device *csi2_port;
 415        unsigned int i;
 416        int ret;
 417
 418        for (i = 0; i < ATOMISP_CAMERA_NR_PORTS; i++) {
 419                csi2_port = &isp->csi2_port[i];
 420                csi2_port->isp = isp;
 421                ret = mipi_csi2_init_entities(csi2_port, i);
 422                if (ret < 0)
 423                        goto fail;
 424        }
 425
 426        return 0;
 427
 428fail:
 429        atomisp_mipi_csi2_cleanup(isp);
 430        return ret;
 431}
 432