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2024-01-04 1543e317f1da31b75942316931e8f491a8920811 
 kernel/drivers/media/platform/marvell-ccic/mmp-driver.c
....@@ -1,18 +1,15 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Support for the camera device found on Marvell MMP processors; known
34  * to work with the Armada 610 as used in the OLPC 1.75 system.
45  *
56  * Copyright 2011 Jonathan Corbet <corbet@lwn.net>
6
- *
7
- * This file may be distributed under the terms of the GNU General
8
- * Public License, version 2.
7
+ * Copyright 2018 Lubomir Rintel <lkundrak@v3.sk>
98  */
109 
1110 #include <linux/init.h>
1211 #include <linux/kernel.h>
1312 #include <linux/module.h>
14
-#include <linux/i2c.h>
15
-#include <linux/platform_data/i2c-gpio.h>
1613 #include <linux/interrupt.h>
1714 #include <linux/spinlock.h>
1815 #include <linux/slab.h>
....@@ -20,10 +17,11 @@
2017 #include <media/v4l2-device.h>
2118 #include <linux/platform_data/media/mmp-camera.h>
2219 #include <linux/device.h>
20
+#include <linux/of.h>
21
+#include <linux/of_platform.h>
2322 #include <linux/platform_device.h>
24
-#include <linux/gpio.h>
23
+#include <linux/pm_runtime.h>
2524 #include <linux/io.h>
26
-#include <linux/delay.h>
2725 #include <linux/list.h>
2826 #include <linux/pm.h>
2927 #include <linux/clk.h>
....@@ -34,10 +32,9 @@
3432 MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
3533 MODULE_LICENSE("GPL");
3634 
37
-static char *mcam_clks[] = {"CCICAXICLK", "CCICFUNCLK", "CCICPHYCLK"};
35
+static char *mcam_clks[] = {"axi", "func", "phy"};
3836 
3937 struct mmp_camera {
40
-	void __iomem *power_regs;
4138 	struct platform_device *pdev;
4239 	struct mcam_camera mcam;
4340 	struct list_head devlist;
....@@ -48,161 +45,6 @@
4845 static inline struct mmp_camera *mcam_to_cam(struct mcam_camera *mcam)
4946 {
5047 	return container_of(mcam, struct mmp_camera, mcam);
51
-}
52
-
53
-/*
54
- * A silly little infrastructure so we can keep track of our devices.
55
- * Chances are that we will never have more than one of them, but
56
- * the Armada 610 *does* have two controllers...
57
- */
58
-
59
-static LIST_HEAD(mmpcam_devices);
60
-static struct mutex mmpcam_devices_lock;
61
-
62
-static void mmpcam_add_device(struct mmp_camera *cam)
63
-{
64
-	mutex_lock(&mmpcam_devices_lock);
65
-	list_add(&cam->devlist, &mmpcam_devices);
66
-	mutex_unlock(&mmpcam_devices_lock);
67
-}
68
-
69
-static void mmpcam_remove_device(struct mmp_camera *cam)
70
-{
71
-	mutex_lock(&mmpcam_devices_lock);
72
-	list_del(&cam->devlist);
73
-	mutex_unlock(&mmpcam_devices_lock);
74
-}
75
-
76
-/*
77
- * Platform dev remove passes us a platform_device, and there's
78
- * no handy unused drvdata to stash a backpointer in.  So just
79
- * dig it out of our list.
80
- */
81
-static struct mmp_camera *mmpcam_find_device(struct platform_device *pdev)
82
-{
83
-	struct mmp_camera *cam;
84
-
85
-	mutex_lock(&mmpcam_devices_lock);
86
-	list_for_each_entry(cam, &mmpcam_devices, devlist) {
87
-		if (cam->pdev == pdev) {
88
-			mutex_unlock(&mmpcam_devices_lock);
89
-			return cam;
90
-		}
91
-	}
92
-	mutex_unlock(&mmpcam_devices_lock);
93
-	return NULL;
94
-}
95
-
96
-
97
-
98
-
99
-/*
100
- * Power-related registers; this almost certainly belongs
101
- * somewhere else.
102
- *
103
- * ARMADA 610 register manual, sec 7.2.1, p1842.
104
- */
105
-#define CPU_SUBSYS_PMU_BASE	0xd4282800
106
-#define REG_CCIC_DCGCR		0x28	/* CCIC dyn clock gate ctrl reg */
107
-#define REG_CCIC_CRCR		0x50	/* CCIC clk reset ctrl reg	*/
108
-#define REG_CCIC2_CRCR		0xf4	/* CCIC2 clk reset ctrl reg	*/
109
-
110
-static void mcam_clk_enable(struct mcam_camera *mcam)
111
-{
112
-	unsigned int i;
113
-
114
-	for (i = 0; i < NR_MCAM_CLK; i++) {
115
-		if (!IS_ERR(mcam->clk[i]))
116
-			clk_prepare_enable(mcam->clk[i]);
117
-	}
118
-}
119
-
120
-static void mcam_clk_disable(struct mcam_camera *mcam)
121
-{
122
-	int i;
123
-
124
-	for (i = NR_MCAM_CLK - 1; i >= 0; i--) {
125
-		if (!IS_ERR(mcam->clk[i]))
126
-			clk_disable_unprepare(mcam->clk[i]);
127
-	}
128
-}
129
-
130
-/*
131
- * Power control.
132
- */
133
-static void mmpcam_power_up_ctlr(struct mmp_camera *cam)
134
-{
135
-	iowrite32(0x3f, cam->power_regs + REG_CCIC_DCGCR);
136
-	iowrite32(0x3805b, cam->power_regs + REG_CCIC_CRCR);
137
-	mdelay(1);
138
-}
139
-
140
-static int mmpcam_power_up(struct mcam_camera *mcam)
141
-{
142
-	struct mmp_camera *cam = mcam_to_cam(mcam);
143
-	struct mmp_camera_platform_data *pdata;
144
-
145
-/*
146
- * Turn on power and clocks to the controller.
147
- */
148
-	mmpcam_power_up_ctlr(cam);
149
-/*
150
- * Provide power to the sensor.
151
- */
152
-	mcam_reg_write(mcam, REG_CLKCTRL, 0x60000002);
153
-	pdata = cam->pdev->dev.platform_data;
154
-	gpio_set_value(pdata->sensor_power_gpio, 1);
155
-	mdelay(5);
156
-	mcam_reg_clear_bit(mcam, REG_CTRL1, 0x10000000);
157
-	gpio_set_value(pdata->sensor_reset_gpio, 0); /* reset is active low */
158
-	mdelay(5);
159
-	gpio_set_value(pdata->sensor_reset_gpio, 1); /* reset is active low */
160
-	mdelay(5);
161
-
162
-	mcam_clk_enable(mcam);
163
-
164
-	return 0;
165
-}
166
-
167
-static void mmpcam_power_down(struct mcam_camera *mcam)
168
-{
169
-	struct mmp_camera *cam = mcam_to_cam(mcam);
170
-	struct mmp_camera_platform_data *pdata;
171
-/*
172
- * Turn off clocks and set reset lines
173
- */
174
-	iowrite32(0, cam->power_regs + REG_CCIC_DCGCR);
175
-	iowrite32(0, cam->power_regs + REG_CCIC_CRCR);
176
-/*
177
- * Shut down the sensor.
178
- */
179
-	pdata = cam->pdev->dev.platform_data;
180
-	gpio_set_value(pdata->sensor_power_gpio, 0);
181
-	gpio_set_value(pdata->sensor_reset_gpio, 0);
182
-
183
-	mcam_clk_disable(mcam);
184
-}
185
-
186
-static void mcam_ctlr_reset(struct mcam_camera *mcam)
187
-{
188
-	unsigned long val;
189
-	struct mmp_camera *cam = mcam_to_cam(mcam);
190
-
191
-	if (mcam->ccic_id) {
192
-		/*
193
-		 * Using CCIC2
194
-		 */
195
-		val = ioread32(cam->power_regs + REG_CCIC2_CRCR);
196
-		iowrite32(val & ~0x2, cam->power_regs + REG_CCIC2_CRCR);
197
-		iowrite32(val | 0x2, cam->power_regs + REG_CCIC2_CRCR);
198
-	} else {
199
-		/*
200
-		 * Using CCIC1
201
-		 */
202
-		val = ioread32(cam->power_regs + REG_CCIC_CRCR);
203
-		iowrite32(val & ~0x2, cam->power_regs + REG_CCIC_CRCR);
204
-		iowrite32(val | 0x2, cam->power_regs + REG_CCIC_CRCR);
205
-	}
20648 }
20749 
20850 /*
....@@ -240,8 +82,8 @@
24082 	 *  bit 8 ~ bit 15: HS_SETTLE
24183 	 *   Time interval during which the HS
24284 	 *   receiver shall ignore any Data Lane
243
-	 *   HS transistions.
244
-	 *   The vaule has been calibrated on
85
+	 *   HS transitions.
86
+	 *   The value has been calibrated on
24587 	 *   different boards. It seems to work well.
24688 	 *
24789 	 *  More detail please refer
....@@ -336,42 +178,46 @@
336178 	struct mmp_camera *cam;
337179 	struct mcam_camera *mcam;
338180 	struct resource *res;
181
+	struct fwnode_handle *ep;
339182 	struct mmp_camera_platform_data *pdata;
340183 	int ret;
341
-
342
-	pdata = pdev->dev.platform_data;
343
-	if (!pdata)
344
-		return -ENODEV;
345184 
346185 	cam = devm_kzalloc(&pdev->dev, sizeof(*cam), GFP_KERNEL);
347186 	if (cam == NULL)
348187 		return -ENOMEM;
188
+	platform_set_drvdata(pdev, cam);
349189 	cam->pdev = pdev;
350190 	INIT_LIST_HEAD(&cam->devlist);
351191 
352192 	mcam = &cam->mcam;
353
-	mcam->plat_power_up = mmpcam_power_up;
354
-	mcam->plat_power_down = mmpcam_power_down;
355
-	mcam->ctlr_reset = mcam_ctlr_reset;
356193 	mcam->calc_dphy = mmpcam_calc_dphy;
357194 	mcam->dev = &pdev->dev;
358
-	mcam->use_smbus = 0;
359
-	mcam->ccic_id = pdev->id;
360
-	mcam->mclk_min = pdata->mclk_min;
361
-	mcam->mclk_src = pdata->mclk_src;
362
-	mcam->mclk_div = pdata->mclk_div;
363
-	mcam->bus_type = pdata->bus_type;
364
-	mcam->dphy = pdata->dphy;
365
-	if (mcam->bus_type == V4L2_MBUS_CSI2) {
195
+	pdata = pdev->dev.platform_data;
196
+	if (pdata) {
197
+		mcam->mclk_src = pdata->mclk_src;
198
+		mcam->mclk_div = pdata->mclk_div;
199
+		mcam->bus_type = pdata->bus_type;
200
+		mcam->dphy = pdata->dphy;
201
+		mcam->lane = pdata->lane;
202
+	} else {
203
+		/*
204
+		 * These are values that used to be hardcoded in mcam-core and
205
+		 * work well on a OLPC XO 1.75 with a parallel bus sensor.
206
+		 * If it turns out other setups make sense, the values should
207
+		 * be obtained from the device tree.
208
+		 */
209
+		mcam->mclk_src = 3;
210
+		mcam->mclk_div = 2;
211
+	}
212
+	if (mcam->bus_type == V4L2_MBUS_CSI2_DPHY) {
366213 		cam->mipi_clk = devm_clk_get(mcam->dev, "mipi");
367214 		if ((IS_ERR(cam->mipi_clk) && mcam->dphy[2] == 0))
368215 			return PTR_ERR(cam->mipi_clk);
369216 	}
370217 	mcam->mipi_enabled = false;
371
-	mcam->lane = pdata->lane;
372218 	mcam->chip_id = MCAM_ARMADA610;
373219 	mcam->buffer_mode = B_DMA_sg;
374
-	strlcpy(mcam->bus_info, "platform:mmp-camera", sizeof(mcam->bus_info));
220
+	strscpy(mcam->bus_info, "platform:mmp-camera", sizeof(mcam->bus_info));
375221 	spin_lock_init(&mcam->dev_lock);
376222 	/*
377223 	 * Get our I/O memory.
....@@ -381,54 +227,39 @@
381227 	if (IS_ERR(mcam->regs))
382228 		return PTR_ERR(mcam->regs);
383229 	mcam->regs_size = resource_size(res);
384
-	/*
385
-	 * Power/clock memory is elsewhere; get it too.  Perhaps this
386
-	 * should really be managed outside of this driver?
387
-	 */
388
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
389
-	cam->power_regs = devm_ioremap_resource(&pdev->dev, res);
390
-	if (IS_ERR(cam->power_regs))
391
-		return PTR_ERR(cam->power_regs);
392
-	/*
393
-	 * Find the i2c adapter.  This assumes, of course, that the
394
-	 * i2c bus is already up and functioning.
395
-	 */
396
-	mcam->i2c_adapter = platform_get_drvdata(pdata->i2c_device);
397
-	if (mcam->i2c_adapter == NULL) {
398
-		dev_err(&pdev->dev, "No i2c adapter\n");
399
-		return -ENODEV;
400
-	}
401
-	/*
402
-	 * Sensor GPIO pins.
403
-	 */
404
-	ret = devm_gpio_request(&pdev->dev, pdata->sensor_power_gpio,
405
-							"cam-power");
406
-	if (ret) {
407
-		dev_err(&pdev->dev, "Can't get sensor power gpio %d",
408
-				pdata->sensor_power_gpio);
409
-		return ret;
410
-	}
411
-	gpio_direction_output(pdata->sensor_power_gpio, 0);
412
-	ret = devm_gpio_request(&pdev->dev, pdata->sensor_reset_gpio,
413
-							"cam-reset");
414
-	if (ret) {
415
-		dev_err(&pdev->dev, "Can't get sensor reset gpio %d",
416
-				pdata->sensor_reset_gpio);
417
-		return ret;
418
-	}
419
-	gpio_direction_output(pdata->sensor_reset_gpio, 0);
420230 
421231 	mcam_init_clk(mcam);
422232 
423233 	/*
424
-	 * Power the device up and hand it off to the core.
234
+	 * Create a match of the sensor against its OF node.
425235 	 */
426
-	ret = mmpcam_power_up(mcam);
427
-	if (ret)
428
-		return ret;
236
+	ep = fwnode_graph_get_next_endpoint(of_fwnode_handle(pdev->dev.of_node),
237
+					    NULL);
238
+	if (!ep)
239
+		return -ENODEV;
240
+
241
+	mcam->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
242
+	mcam->asd.match.fwnode = fwnode_graph_get_remote_port_parent(ep);
243
+
244
+	fwnode_handle_put(ep);
245
+
246
+	/*
247
+	 * Register the device with the core.
248
+	 */
429249 	ret = mccic_register(mcam);
430250 	if (ret)
431
-		goto out_power_down;
251
+		return ret;
252
+
253
+	/*
254
+	 * Add OF clock provider.
255
+	 */
256
+	ret = of_clk_add_provider(pdev->dev.of_node, of_clk_src_simple_get,
257
+								mcam->mclk);
258
+	if (ret) {
259
+		dev_err(&pdev->dev, "can't add DT clock provider\n");
260
+		goto out;
261
+	}
262
+
432263 	/*
433264 	 * Finally, set up our IRQ now that the core is ready to
434265 	 * deal with it.
....@@ -436,20 +267,20 @@
436267 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
437268 	if (res == NULL) {
438269 		ret = -ENODEV;
439
-		goto out_unregister;
270
+		goto out;
440271 	}
441272 	cam->irq = res->start;
442273 	ret = devm_request_irq(&pdev->dev, cam->irq, mmpcam_irq, IRQF_SHARED,
443274 					"mmp-camera", mcam);
444
-	if (ret == 0) {
445
-		mmpcam_add_device(cam);
446
-		return 0;
447
-	}
275
+	if (ret)
276
+		goto out;
448277 
449
-out_unregister:
278
+	pm_runtime_enable(&pdev->dev);
279
+	return 0;
280
+out:
281
+	fwnode_handle_put(mcam->asd.match.fwnode);
450282 	mccic_shutdown(mcam);
451
-out_power_down:
452
-	mmpcam_power_down(mcam);
283
+
453284 	return ret;
454285 }
455286 
....@@ -458,15 +289,14 @@
458289 {
459290 	struct mcam_camera *mcam = &cam->mcam;
460291 
461
-	mmpcam_remove_device(cam);
462292 	mccic_shutdown(mcam);
463
-	mmpcam_power_down(mcam);
293
+	pm_runtime_force_suspend(mcam->dev);
464294 	return 0;
465295 }
466296 
467297 static int mmpcam_platform_remove(struct platform_device *pdev)
468298 {
469
-	struct mmp_camera *cam = mmpcam_find_device(pdev);
299
+	struct mmp_camera *cam = platform_get_drvdata(pdev);
470300 
471301 	if (cam == NULL)
472302 		return -ENODEV;
....@@ -476,62 +306,74 @@
476306 /*
477307  * Suspend/resume support.
478308  */
309
+
479310 #ifdef CONFIG_PM
480
-
481
-static int mmpcam_suspend(struct platform_device *pdev, pm_message_t state)
311
+static int mmpcam_runtime_resume(struct device *dev)
482312 {
483
-	struct mmp_camera *cam = mmpcam_find_device(pdev);
313
+	struct mmp_camera *cam = dev_get_drvdata(dev);
314
+	struct mcam_camera *mcam = &cam->mcam;
315
+	unsigned int i;
484316 
485
-	if (state.event != PM_EVENT_SUSPEND)
486
-		return 0;
487
-	mccic_suspend(&cam->mcam);
317
+	for (i = 0; i < NR_MCAM_CLK; i++) {
318
+		if (!IS_ERR(mcam->clk[i]))
319
+			clk_prepare_enable(mcam->clk[i]);
320
+	}
321
+
488322 	return 0;
489323 }
490324 
491
-static int mmpcam_resume(struct platform_device *pdev)
325
+static int mmpcam_runtime_suspend(struct device *dev)
492326 {
493
-	struct mmp_camera *cam = mmpcam_find_device(pdev);
327
+	struct mmp_camera *cam = dev_get_drvdata(dev);
328
+	struct mcam_camera *mcam = &cam->mcam;
329
+	int i;
494330 
495
-	/*
496
-	 * Power up unconditionally just in case the core tries to
497
-	 * touch a register even if nothing was active before; trust
498
-	 * me, it's better this way.
499
-	 */
500
-	mmpcam_power_up_ctlr(cam);
501
-	return mccic_resume(&cam->mcam);
331
+	for (i = NR_MCAM_CLK - 1; i >= 0; i--) {
332
+		if (!IS_ERR(mcam->clk[i]))
333
+			clk_disable_unprepare(mcam->clk[i]);
334
+	}
335
+
336
+	return 0;
502337 }
503338 
339
+static int __maybe_unused mmpcam_suspend(struct device *dev)
340
+{
341
+	struct mmp_camera *cam = dev_get_drvdata(dev);
342
+
343
+	if (!pm_runtime_suspended(dev))
344
+		mccic_suspend(&cam->mcam);
345
+	return 0;
346
+}
347
+
348
+static int __maybe_unused mmpcam_resume(struct device *dev)
349
+{
350
+	struct mmp_camera *cam = dev_get_drvdata(dev);
351
+
352
+	if (!pm_runtime_suspended(dev))
353
+		return mccic_resume(&cam->mcam);
354
+	return 0;
355
+}
504356 #endif
505357 
358
+static const struct dev_pm_ops mmpcam_pm_ops = {
359
+	SET_RUNTIME_PM_OPS(mmpcam_runtime_suspend, mmpcam_runtime_resume, NULL)
360
+	SET_SYSTEM_SLEEP_PM_OPS(mmpcam_suspend, mmpcam_resume)
361
+};
362
+
363
+static const struct of_device_id mmpcam_of_match[] = {
364
+	{ .compatible = "marvell,mmp2-ccic", },
365
+	{},
366
+};
367
+MODULE_DEVICE_TABLE(of, mmpcam_of_match);
506368 
507369 static struct platform_driver mmpcam_driver = {
508370 	.probe		= mmpcam_probe,
509371 	.remove		= mmpcam_platform_remove,
510
-#ifdef CONFIG_PM
511
-	.suspend	= mmpcam_suspend,
512
-	.resume		= mmpcam_resume,
513
-#endif
514372 	.driver = {
515373 		.name	= "mmp-camera",
374
+		.of_match_table = of_match_ptr(mmpcam_of_match),
375
+		.pm = &mmpcam_pm_ops,
516376 	}
517377 };
518378 
519
-
520
-static int __init mmpcam_init_module(void)
521
-{
522
-	mutex_init(&mmpcam_devices_lock);
523
-	return platform_driver_register(&mmpcam_driver);
524
-}
525
-
526
-static void __exit mmpcam_exit_module(void)
527
-{
528
-	platform_driver_unregister(&mmpcam_driver);
529
-	/*
530
-	 * platform_driver_unregister() should have emptied the list
531
-	 */
532
-	if (!list_empty(&mmpcam_devices))
533
-		printk(KERN_ERR "mmp_camera leaving devices behind\n");
534
-}
535
-
536
-module_init(mmpcam_init_module);
537
-module_exit(mmpcam_exit_module);
379
+module_platform_driver(mmpcam_driver);