1 // SPDX-License-Identifier: GPL-2.0
3 * Support for Medifield PNW Camera Imaging ISP subsystem.
5 * Copyright (c) 2010 Intel Corporation. All Rights Reserved.
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.
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.
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"
26 v4l2_mbus_framefmt *__csi2_get_format(struct atomisp_mipi_csi2_device *csi2,
27 struct v4l2_subdev_state *sd_state,
28 enum v4l2_subdev_format_whence which,
31 if (which == V4L2_SUBDEV_FORMAT_TRY)
32 return v4l2_subdev_get_try_format(&csi2->subdev, sd_state,
35 return &csi2->formats[pad];
39 * csi2_enum_mbus_code - Handle pixel format enumeration
40 * @sd : pointer to v4l2 subdev structure
41 * @fh : V4L2 subdev file handle
42 * @code : pointer to v4l2_subdev_pad_mbus_code_enum structure
43 * return -EINVAL or zero on success
45 static int csi2_enum_mbus_code(struct v4l2_subdev *sd,
46 struct v4l2_subdev_state *sd_state,
47 struct v4l2_subdev_mbus_code_enum *code)
49 const struct atomisp_in_fmt_conv *ic = atomisp_in_fmt_conv;
53 if (i == code->index) {
54 code->code = ic->code;
64 * csi2_get_format - Handle get format by pads subdev method
65 * @sd : pointer to v4l2 subdev structure
66 * @fh : V4L2 subdev file handle
68 * @fmt: pointer to v4l2 format structure
69 * return -EINVAL or zero on success
71 static int csi2_get_format(struct v4l2_subdev *sd,
72 struct v4l2_subdev_state *sd_state,
73 struct v4l2_subdev_format *fmt)
75 struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
76 struct v4l2_mbus_framefmt *format;
78 format = __csi2_get_format(csi2, sd_state, fmt->which, fmt->pad);
80 fmt->format = *format;
85 int atomisp_csi2_set_ffmt(struct v4l2_subdev *sd,
86 struct v4l2_subdev_state *sd_state,
87 unsigned int which, uint16_t pad,
88 struct v4l2_mbus_framefmt *ffmt)
90 struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
91 struct v4l2_mbus_framefmt *actual_ffmt = __csi2_get_format(csi2,
95 if (pad == CSI2_PAD_SINK) {
96 const struct atomisp_in_fmt_conv *ic;
97 struct v4l2_mbus_framefmt tmp_ffmt;
99 ic = atomisp_find_in_fmt_conv(ffmt->code);
101 actual_ffmt->code = ic->code;
103 actual_ffmt->code = atomisp_in_fmt_conv[0].code;
105 actual_ffmt->width = clamp_t(u32, ffmt->width,
108 actual_ffmt->height = clamp_t(u32, ffmt->height,
110 ATOM_ISP_MAX_HEIGHT);
112 tmp_ffmt = *ffmt = *actual_ffmt;
114 return atomisp_csi2_set_ffmt(sd, sd_state, which,
119 /* FIXME: DPCM decompression */
120 *actual_ffmt = *ffmt = *__csi2_get_format(csi2, sd_state, which,
127 * csi2_set_format - Handle set format by pads subdev method
128 * @sd : pointer to v4l2 subdev structure
129 * @fh : V4L2 subdev file handle
131 * @fmt: pointer to v4l2 format structure
132 * return -EINVAL or zero on success
134 static int csi2_set_format(struct v4l2_subdev *sd,
135 struct v4l2_subdev_state *sd_state,
136 struct v4l2_subdev_format *fmt)
138 return atomisp_csi2_set_ffmt(sd, sd_state, fmt->which, fmt->pad,
143 * csi2_set_stream - Enable/Disable streaming on the CSI2 module
144 * @sd: ISP CSI2 V4L2 subdevice
145 * @enable: Enable/disable stream (1/0)
147 * Return 0 on success or a negative error code otherwise.
149 static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
154 /* subdev core operations */
155 static const struct v4l2_subdev_core_ops csi2_core_ops = {
158 /* subdev video operations */
159 static const struct v4l2_subdev_video_ops csi2_video_ops = {
160 .s_stream = csi2_set_stream,
163 /* subdev pad operations */
164 static const struct v4l2_subdev_pad_ops csi2_pad_ops = {
165 .enum_mbus_code = csi2_enum_mbus_code,
166 .get_fmt = csi2_get_format,
167 .set_fmt = csi2_set_format,
168 .link_validate = v4l2_subdev_link_validate_default,
171 /* subdev operations */
172 static const struct v4l2_subdev_ops csi2_ops = {
173 .core = &csi2_core_ops,
174 .video = &csi2_video_ops,
175 .pad = &csi2_pad_ops,
178 /* media operations */
179 static const struct media_entity_operations csi2_media_ops = {
180 .link_validate = v4l2_subdev_link_validate,
184 * ispcsi2_init_entities - Initialize subdev and media entity.
185 * @csi2: Pointer to ispcsi2 structure.
186 * return -ENOMEM or zero on success
188 static int mipi_csi2_init_entities(struct atomisp_mipi_csi2_device *csi2,
191 struct v4l2_subdev *sd = &csi2->subdev;
192 struct media_pad *pads = csi2->pads;
193 struct media_entity *me = &sd->entity;
196 v4l2_subdev_init(sd, &csi2_ops);
197 snprintf(sd->name, sizeof(sd->name), "ATOM ISP CSI2-port%d", port);
199 v4l2_set_subdevdata(sd, csi2);
200 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
202 pads[CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
203 pads[CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
205 me->ops = &csi2_media_ops;
206 me->function = MEDIA_ENT_F_VID_IF_BRIDGE;
207 ret = media_entity_pads_init(me, CSI2_PADS_NUM, pads);
211 csi2->formats[CSI2_PAD_SINK].code = atomisp_in_fmt_conv[0].code;
212 csi2->formats[CSI2_PAD_SOURCE].code = atomisp_in_fmt_conv[0].code;
218 atomisp_mipi_csi2_unregister_entities(struct atomisp_mipi_csi2_device *csi2)
220 media_entity_cleanup(&csi2->subdev.entity);
221 v4l2_device_unregister_subdev(&csi2->subdev);
224 int atomisp_mipi_csi2_register_entities(struct atomisp_mipi_csi2_device *csi2,
225 struct v4l2_device *vdev)
229 /* Register the subdev and video nodes. */
230 ret = v4l2_device_register_subdev(vdev, &csi2->subdev);
237 atomisp_mipi_csi2_unregister_entities(csi2);
241 static const int LIMIT_SHIFT = 6; /* Limit numeric range into 31 bits */
244 atomisp_csi2_configure_calc(const short int coeffs[2], int mipi_freq, int def)
246 /* Delay counter accuracy, 1/0.0625 for ANN/CHT, 1/0.125 for BXT */
247 static const int accinv = 16; /* 1 / COUNT_ACC */
250 if (mipi_freq >> LIMIT_SHIFT <= 0)
253 r = accinv * coeffs[1] * (500000000 >> LIMIT_SHIFT);
254 r /= mipi_freq >> LIMIT_SHIFT;
255 r += accinv * coeffs[0];
260 static void atomisp_csi2_configure_isp2401(struct atomisp_sub_device *asd)
263 * The ISP2401 new input system CSI2+ receiver has several
264 * parameters affecting the receiver timings. These depend
265 * on the MIPI bus frequency F in Hz (sensor transmitter rate)
267 * register value = (A/1e9 + B * UI) / COUNT_ACC
269 * UI = 1 / (2 * F) in seconds
270 * COUNT_ACC = counter accuracy in seconds
271 * For ANN and CHV, COUNT_ACC = 0.0625 ns
272 * For BXT, COUNT_ACC = 0.125 ns
273 * A and B are coefficients from the table below,
274 * depending whether the register minimum or maximum value is
278 * reg_rx_csi_dly_cnt_termen_clane 0 0 38 0
279 * reg_rx_csi_dly_cnt_settle_clane 95 -8 300 -16
281 * reg_rx_csi_dly_cnt_termen_dlane0 0 0 35 4
282 * reg_rx_csi_dly_cnt_settle_dlane0 85 -2 145 -6
283 * reg_rx_csi_dly_cnt_termen_dlane1 0 0 35 4
284 * reg_rx_csi_dly_cnt_settle_dlane1 85 -2 145 -6
285 * reg_rx_csi_dly_cnt_termen_dlane2 0 0 35 4
286 * reg_rx_csi_dly_cnt_settle_dlane2 85 -2 145 -6
287 * reg_rx_csi_dly_cnt_termen_dlane3 0 0 35 4
288 * reg_rx_csi_dly_cnt_settle_dlane3 85 -2 145 -6
290 * We use the minimum values in the calculations below.
292 static const short int coeff_clk_termen[] = { 0, 0 };
293 static const short int coeff_clk_settle[] = { 95, -8 };
294 static const short int coeff_dat_termen[] = { 0, 0 };
295 static const short int coeff_dat_settle[] = { 85, -2 };
296 static const int TERMEN_DEFAULT = 0 * 0;
297 static const int SETTLE_DEFAULT = 0x480;
299 static const hrt_address csi2_port_base[] = {
300 [ATOMISP_CAMERA_PORT_PRIMARY] = CSI2_PORT_A_BASE,
301 [ATOMISP_CAMERA_PORT_SECONDARY] = CSI2_PORT_B_BASE,
302 [ATOMISP_CAMERA_PORT_TERTIARY] = CSI2_PORT_C_BASE,
304 /* Number of lanes on each port, excluding clock lane */
305 static const unsigned char csi2_port_lanes[] = {
306 [ATOMISP_CAMERA_PORT_PRIMARY] = 4,
307 [ATOMISP_CAMERA_PORT_SECONDARY] = 2,
308 [ATOMISP_CAMERA_PORT_TERTIARY] = 2,
310 static const hrt_address csi2_lane_base[] = {
323 struct v4l2_control ctrl;
324 struct atomisp_device *isp = asd->isp;
326 enum atomisp_camera_port port;
329 port = isp->inputs[asd->input_curr].port;
331 ctrl.id = V4L2_CID_LINK_FREQ;
333 (isp->inputs[asd->input_curr].camera->ctrl_handler, &ctrl) == 0)
334 mipi_freq = ctrl.value;
336 clk_termen = atomisp_csi2_configure_calc(coeff_clk_termen, mipi_freq,
338 clk_settle = atomisp_csi2_configure_calc(coeff_clk_settle, mipi_freq,
340 dat_termen = atomisp_csi2_configure_calc(coeff_dat_termen, mipi_freq,
342 dat_settle = atomisp_csi2_configure_calc(coeff_dat_settle, mipi_freq,
345 for (n = 0; n < csi2_port_lanes[port] + 1; n++) {
346 hrt_address base = csi2_port_base[port] + csi2_lane_base[n];
348 atomisp_css2_hw_store_32(base + CSI2_REG_RX_CSI_DLY_CNT_TERMEN,
349 n == 0 ? clk_termen : dat_termen);
350 atomisp_css2_hw_store_32(base + CSI2_REG_RX_CSI_DLY_CNT_SETTLE,
351 n == 0 ? clk_settle : dat_settle);
355 void atomisp_csi2_configure(struct atomisp_sub_device *asd)
357 if (IS_HWREVISION(asd->isp, ATOMISP_HW_REVISION_ISP2401))
358 atomisp_csi2_configure_isp2401(asd);
362 * atomisp_mipi_csi2_cleanup - Routine for module driver cleanup
364 void atomisp_mipi_csi2_cleanup(struct atomisp_device *isp)
368 int atomisp_mipi_csi2_init(struct atomisp_device *isp)
370 struct atomisp_mipi_csi2_device *csi2_port;
374 for (i = 0; i < ATOMISP_CAMERA_NR_PORTS; i++) {
375 csi2_port = &isp->csi2_port[i];
376 csi2_port->isp = isp;
377 ret = mipi_csi2_init_entities(csi2_port, i);
385 atomisp_mipi_csi2_cleanup(isp);