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
25 static struct
__csi2_get_format(struct atomisp_mipi_csi2_device * csi2,struct v4l2_subdev_state * sd_state,enum v4l2_subdev_format_whence which,unsigned int pad)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,
29 unsigned int pad)
30 {
31 if (which == V4L2_SUBDEV_FORMAT_TRY)
32 return v4l2_subdev_state_get_format(sd_state, pad);
33 else
34 return &csi2->formats[pad];
35 }
36
37 /*
38 * csi2_enum_mbus_code - Handle pixel format enumeration
39 * @sd : pointer to v4l2 subdev structure
40 * @fh : V4L2 subdev file handle
41 * @code : pointer to v4l2_subdev_pad_mbus_code_enum structure
42 * return -EINVAL or zero on success
43 */
csi2_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)44 static int csi2_enum_mbus_code(struct v4l2_subdev *sd,
45 struct v4l2_subdev_state *sd_state,
46 struct v4l2_subdev_mbus_code_enum *code)
47 {
48 const struct atomisp_in_fmt_conv *ic = atomisp_in_fmt_conv;
49 unsigned int i = 0;
50
51 while (ic->code) {
52 if (i == code->index) {
53 code->code = ic->code;
54 return 0;
55 }
56 i++, ic++;
57 }
58
59 return -EINVAL;
60 }
61
62 /*
63 * csi2_get_format - Handle get format by pads subdev method
64 * @sd : pointer to v4l2 subdev structure
65 * @fh : V4L2 subdev file handle
66 * @pad: pad num
67 * @fmt: pointer to v4l2 format structure
68 * return -EINVAL or zero on success
69 */
csi2_get_format(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * fmt)70 static int csi2_get_format(struct v4l2_subdev *sd,
71 struct v4l2_subdev_state *sd_state,
72 struct v4l2_subdev_format *fmt)
73 {
74 struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
75 struct v4l2_mbus_framefmt *format;
76
77 format = __csi2_get_format(csi2, sd_state, fmt->which, fmt->pad);
78
79 fmt->format = *format;
80
81 return 0;
82 }
83
atomisp_csi2_set_ffmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,unsigned int which,uint16_t pad,struct v4l2_mbus_framefmt * ffmt)84 int atomisp_csi2_set_ffmt(struct v4l2_subdev *sd,
85 struct v4l2_subdev_state *sd_state,
86 unsigned int which, uint16_t pad,
87 struct v4l2_mbus_framefmt *ffmt)
88 {
89 struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
90 struct v4l2_mbus_framefmt *actual_ffmt = __csi2_get_format(csi2,
91 sd_state,
92 which, pad);
93
94 if (pad == CSI2_PAD_SINK) {
95 const struct atomisp_in_fmt_conv *ic;
96 struct v4l2_mbus_framefmt tmp_ffmt;
97
98 ic = atomisp_find_in_fmt_conv(ffmt->code);
99 if (ic)
100 actual_ffmt->code = ic->code;
101 else
102 actual_ffmt->code = atomisp_in_fmt_conv[0].code;
103
104 actual_ffmt->width = clamp_t(u32, ffmt->width,
105 ATOM_ISP_MIN_WIDTH,
106 ATOM_ISP_MAX_WIDTH);
107 actual_ffmt->height = clamp_t(u32, ffmt->height,
108 ATOM_ISP_MIN_HEIGHT,
109 ATOM_ISP_MAX_HEIGHT);
110
111 tmp_ffmt = *ffmt = *actual_ffmt;
112
113 return atomisp_csi2_set_ffmt(sd, sd_state, which,
114 CSI2_PAD_SOURCE,
115 &tmp_ffmt);
116 }
117
118 /* FIXME: DPCM decompression */
119 *actual_ffmt = *ffmt = *__csi2_get_format(csi2, sd_state, which,
120 CSI2_PAD_SINK);
121
122 return 0;
123 }
124
125 /*
126 * csi2_set_format - Handle set format by pads subdev method
127 * @sd : pointer to v4l2 subdev structure
128 * @fh : V4L2 subdev file handle
129 * @pad: pad num
130 * @fmt: pointer to v4l2 format structure
131 * return -EINVAL or zero on success
132 */
csi2_set_format(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * fmt)133 static int csi2_set_format(struct v4l2_subdev *sd,
134 struct v4l2_subdev_state *sd_state,
135 struct v4l2_subdev_format *fmt)
136 {
137 return atomisp_csi2_set_ffmt(sd, sd_state, fmt->which, fmt->pad,
138 &fmt->format);
139 }
140
141 /*
142 * csi2_set_stream - Enable/Disable streaming on the CSI2 module
143 * @sd: ISP CSI2 V4L2 subdevice
144 * @enable: Enable/disable stream (1/0)
145 *
146 * Return 0 on success or a negative error code otherwise.
147 */
csi2_set_stream(struct v4l2_subdev * sd,int enable)148 static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
149 {
150 return 0;
151 }
152
153 /* subdev core operations */
154 static const struct v4l2_subdev_core_ops csi2_core_ops = {
155 };
156
157 /* subdev video operations */
158 static const struct v4l2_subdev_video_ops csi2_video_ops = {
159 .s_stream = csi2_set_stream,
160 };
161
162 /* subdev pad operations */
163 static const struct v4l2_subdev_pad_ops csi2_pad_ops = {
164 .enum_mbus_code = csi2_enum_mbus_code,
165 .get_fmt = csi2_get_format,
166 .set_fmt = csi2_set_format,
167 .link_validate = v4l2_subdev_link_validate_default,
168 };
169
170 /* subdev operations */
171 static const struct v4l2_subdev_ops csi2_ops = {
172 .core = &csi2_core_ops,
173 .video = &csi2_video_ops,
174 .pad = &csi2_pad_ops,
175 };
176
177 /* media operations */
178 static const struct media_entity_operations csi2_media_ops = {
179 .link_validate = v4l2_subdev_link_validate,
180 };
181
182 /*
183 * ispcsi2_init_entities - Initialize subdev and media entity.
184 * @csi2: Pointer to ispcsi2 structure.
185 * return -ENOMEM or zero on success
186 */
mipi_csi2_init_entities(struct atomisp_mipi_csi2_device * csi2,int port)187 static int mipi_csi2_init_entities(struct atomisp_mipi_csi2_device *csi2,
188 int port)
189 {
190 struct v4l2_subdev *sd = &csi2->subdev;
191 struct media_pad *pads = csi2->pads;
192 struct media_entity *me = &sd->entity;
193 int ret;
194
195 v4l2_subdev_init(sd, &csi2_ops);
196 snprintf(sd->name, sizeof(sd->name), "ATOM ISP CSI2-port%d", port);
197
198 v4l2_set_subdevdata(sd, csi2);
199 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
200
201 pads[CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
202 pads[CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
203
204 me->ops = &csi2_media_ops;
205 me->function = MEDIA_ENT_F_VID_IF_BRIDGE;
206 ret = media_entity_pads_init(me, CSI2_PADS_NUM, pads);
207 if (ret < 0)
208 return ret;
209
210 csi2->formats[CSI2_PAD_SINK].code = atomisp_in_fmt_conv[0].code;
211 csi2->formats[CSI2_PAD_SOURCE].code = atomisp_in_fmt_conv[0].code;
212
213 return 0;
214 }
215
216 void
atomisp_mipi_csi2_unregister_entities(struct atomisp_mipi_csi2_device * csi2)217 atomisp_mipi_csi2_unregister_entities(struct atomisp_mipi_csi2_device *csi2)
218 {
219 media_entity_cleanup(&csi2->subdev.entity);
220 v4l2_device_unregister_subdev(&csi2->subdev);
221 }
222
atomisp_mipi_csi2_register_entities(struct atomisp_mipi_csi2_device * csi2,struct v4l2_device * vdev)223 int atomisp_mipi_csi2_register_entities(struct atomisp_mipi_csi2_device *csi2,
224 struct v4l2_device *vdev)
225 {
226 int ret;
227
228 /* Register the subdev and video nodes. */
229 ret = v4l2_device_register_subdev(vdev, &csi2->subdev);
230 if (ret < 0)
231 goto error;
232
233 return 0;
234
235 error:
236 atomisp_mipi_csi2_unregister_entities(csi2);
237 return ret;
238 }
239
240 static const int LIMIT_SHIFT = 6; /* Limit numeric range into 31 bits */
241
242 static int
atomisp_csi2_configure_calc(const short int coeffs[2],int mipi_freq,int def)243 atomisp_csi2_configure_calc(const short int coeffs[2], int mipi_freq, int def)
244 {
245 /* Delay counter accuracy, 1/0.0625 for ANN/CHT, 1/0.125 for BXT */
246 static const int accinv = 16; /* 1 / COUNT_ACC */
247 int r;
248
249 if (mipi_freq >> LIMIT_SHIFT <= 0)
250 return def;
251
252 r = accinv * coeffs[1] * (500000000 >> LIMIT_SHIFT);
253 r /= mipi_freq >> LIMIT_SHIFT;
254 r += accinv * coeffs[0];
255
256 return r;
257 }
258
atomisp_csi2_configure_isp2401(struct atomisp_sub_device * asd)259 static void atomisp_csi2_configure_isp2401(struct atomisp_sub_device *asd)
260 {
261 /*
262 * The ISP2401 new input system CSI2+ receiver has several
263 * parameters affecting the receiver timings. These depend
264 * on the MIPI bus frequency F in Hz (sensor transmitter rate)
265 * as follows:
266 * register value = (A/1e9 + B * UI) / COUNT_ACC
267 * where
268 * UI = 1 / (2 * F) in seconds
269 * COUNT_ACC = counter accuracy in seconds
270 * For ANN and CHV, COUNT_ACC = 0.0625 ns
271 * For BXT, COUNT_ACC = 0.125 ns
272 * A and B are coefficients from the table below,
273 * depending whether the register minimum or maximum value is
274 * calculated.
275 * Minimum Maximum
276 * Clock lane A B A B
277 * reg_rx_csi_dly_cnt_termen_clane 0 0 38 0
278 * reg_rx_csi_dly_cnt_settle_clane 95 -8 300 -16
279 * Data lanes
280 * reg_rx_csi_dly_cnt_termen_dlane0 0 0 35 4
281 * reg_rx_csi_dly_cnt_settle_dlane0 85 -2 145 -6
282 * reg_rx_csi_dly_cnt_termen_dlane1 0 0 35 4
283 * reg_rx_csi_dly_cnt_settle_dlane1 85 -2 145 -6
284 * reg_rx_csi_dly_cnt_termen_dlane2 0 0 35 4
285 * reg_rx_csi_dly_cnt_settle_dlane2 85 -2 145 -6
286 * reg_rx_csi_dly_cnt_termen_dlane3 0 0 35 4
287 * reg_rx_csi_dly_cnt_settle_dlane3 85 -2 145 -6
288 *
289 * We use the minimum values in the calculations below.
290 */
291 static const short int coeff_clk_termen[] = { 0, 0 };
292 static const short int coeff_clk_settle[] = { 95, -8 };
293 static const short int coeff_dat_termen[] = { 0, 0 };
294 static const short int coeff_dat_settle[] = { 85, -2 };
295 static const int TERMEN_DEFAULT = 0 * 0;
296 static const int SETTLE_DEFAULT = 0x480;
297
298 static const hrt_address csi2_port_base[] = {
299 [ATOMISP_CAMERA_PORT_PRIMARY] = CSI2_PORT_A_BASE,
300 [ATOMISP_CAMERA_PORT_SECONDARY] = CSI2_PORT_B_BASE,
301 [ATOMISP_CAMERA_PORT_TERTIARY] = CSI2_PORT_C_BASE,
302 };
303 /* Number of lanes on each port, excluding clock lane */
304 static const unsigned char csi2_port_lanes[] = {
305 [ATOMISP_CAMERA_PORT_PRIMARY] = 4,
306 [ATOMISP_CAMERA_PORT_SECONDARY] = 2,
307 [ATOMISP_CAMERA_PORT_TERTIARY] = 2,
308 };
309 static const hrt_address csi2_lane_base[] = {
310 CSI2_LANE_CL_BASE,
311 CSI2_LANE_D0_BASE,
312 CSI2_LANE_D1_BASE,
313 CSI2_LANE_D2_BASE,
314 CSI2_LANE_D3_BASE,
315 };
316
317 int clk_termen;
318 int clk_settle;
319 int dat_termen;
320 int dat_settle;
321
322 struct v4l2_control ctrl;
323 struct atomisp_device *isp = asd->isp;
324 int mipi_freq = 0;
325 enum atomisp_camera_port port;
326 int n;
327
328 port = isp->inputs[asd->input_curr].port;
329
330 ctrl.id = V4L2_CID_LINK_FREQ;
331 if (v4l2_g_ctrl
332 (isp->inputs[asd->input_curr].camera->ctrl_handler, &ctrl) == 0)
333 mipi_freq = ctrl.value;
334
335 clk_termen = atomisp_csi2_configure_calc(coeff_clk_termen, mipi_freq,
336 TERMEN_DEFAULT);
337 clk_settle = atomisp_csi2_configure_calc(coeff_clk_settle, mipi_freq,
338 SETTLE_DEFAULT);
339 dat_termen = atomisp_csi2_configure_calc(coeff_dat_termen, mipi_freq,
340 TERMEN_DEFAULT);
341 dat_settle = atomisp_csi2_configure_calc(coeff_dat_settle, mipi_freq,
342 SETTLE_DEFAULT);
343
344 for (n = 0; n < csi2_port_lanes[port] + 1; n++) {
345 hrt_address base = csi2_port_base[port] + csi2_lane_base[n];
346
347 atomisp_css2_hw_store_32(base + CSI2_REG_RX_CSI_DLY_CNT_TERMEN,
348 n == 0 ? clk_termen : dat_termen);
349 atomisp_css2_hw_store_32(base + CSI2_REG_RX_CSI_DLY_CNT_SETTLE,
350 n == 0 ? clk_settle : dat_settle);
351 }
352 }
353
atomisp_csi2_configure(struct atomisp_sub_device * asd)354 void atomisp_csi2_configure(struct atomisp_sub_device *asd)
355 {
356 if (IS_HWREVISION(asd->isp, ATOMISP_HW_REVISION_ISP2401))
357 atomisp_csi2_configure_isp2401(asd);
358 }
359
360 /*
361 * atomisp_mipi_csi2_cleanup - Routine for module driver cleanup
362 */
atomisp_mipi_csi2_cleanup(struct atomisp_device * isp)363 void atomisp_mipi_csi2_cleanup(struct atomisp_device *isp)
364 {
365 }
366
atomisp_mipi_csi2_init(struct atomisp_device * isp)367 int atomisp_mipi_csi2_init(struct atomisp_device *isp)
368 {
369 struct atomisp_mipi_csi2_device *csi2_port;
370 unsigned int i;
371 int ret;
372
373 ret = atomisp_csi2_bridge_init(isp);
374 if (ret < 0)
375 return ret;
376
377 for (i = 0; i < ATOMISP_CAMERA_NR_PORTS; i++) {
378 csi2_port = &isp->csi2_port[i];
379 csi2_port->isp = isp;
380 ret = mipi_csi2_init_entities(csi2_port, i);
381 if (ret < 0)
382 goto fail;
383 }
384
385 return 0;
386
387 fail:
388 atomisp_mipi_csi2_cleanup(isp);
389 return ret;
390 }
391