summaryrefslogtreecommitdiff
path: root/drivers/misc/xilinx_sdfec.c
blob: f257d3812110f613d6b88824440813336bc23f97 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
// SPDX-License-Identifier: GPL-2.0
/*
 * Xilinx SDFEC
 *
 * Copyright (C) 2019 Xilinx, Inc.
 *
 * Description:
 * This driver is developed for SDFEC16 (Soft Decision FEC 16nm)
 * IP. It exposes a char device which supports file operations
 * like  open(), close() and ioctl().
 */

#include <linux/miscdevice.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/clk.h>

#define DEV_NAME_LEN 12

static struct idr dev_idr;
static struct mutex dev_idr_lock;

/**
 * struct xsdfec_clks - For managing SD-FEC clocks
 * @core_clk: Main processing clock for core
 * @axi_clk: AXI4-Lite memory-mapped clock
 * @din_words_clk: DIN Words AXI4-Stream Slave clock
 * @din_clk: DIN AXI4-Stream Slave clock
 * @dout_clk: DOUT Words AXI4-Stream Slave clock
 * @dout_words_clk: DOUT AXI4-Stream Slave clock
 * @ctrl_clk: Control AXI4-Stream Slave clock
 * @status_clk: Status AXI4-Stream Slave clock
 */
struct xsdfec_clks {
	struct clk *core_clk;
	struct clk *axi_clk;
	struct clk *din_words_clk;
	struct clk *din_clk;
	struct clk *dout_clk;
	struct clk *dout_words_clk;
	struct clk *ctrl_clk;
	struct clk *status_clk;
};

/**
 * struct xsdfec_dev - Driver data for SDFEC
 * @regs: device physical base address
 * @dev: pointer to device struct
 * @miscdev: Misc device handle
 * @error_data_lock: Error counter and states spinlock
 * @clks: Clocks managed by the SDFEC driver
 * @dev_name: Device name
 * @dev_id: Device ID
 *
 * This structure contains necessary state for SDFEC driver to operate
 */
struct xsdfec_dev {
	void __iomem *regs;
	struct device *dev;
	struct miscdevice miscdev;
	/* Spinlock to protect state_updated and stats_updated */
	spinlock_t error_data_lock;
	struct xsdfec_clks clks;
	char dev_name[DEV_NAME_LEN];
	int dev_id;
};

static const struct file_operations xsdfec_fops = {
	.owner = THIS_MODULE,
};

static int xsdfec_clk_init(struct platform_device *pdev,
			   struct xsdfec_clks *clks)
{
	int err;

	clks->core_clk = devm_clk_get(&pdev->dev, "core_clk");
	if (IS_ERR(clks->core_clk)) {
		dev_err(&pdev->dev, "failed to get core_clk");
		return PTR_ERR(clks->core_clk);
	}

	clks->axi_clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
	if (IS_ERR(clks->axi_clk)) {
		dev_err(&pdev->dev, "failed to get axi_clk");
		return PTR_ERR(clks->axi_clk);
	}

	clks->din_words_clk = devm_clk_get(&pdev->dev, "s_axis_din_words_aclk");
	if (IS_ERR(clks->din_words_clk)) {
		if (PTR_ERR(clks->din_words_clk) != -ENOENT) {
			err = PTR_ERR(clks->din_words_clk);
			return err;
		}
		clks->din_words_clk = NULL;
	}

	clks->din_clk = devm_clk_get(&pdev->dev, "s_axis_din_aclk");
	if (IS_ERR(clks->din_clk)) {
		if (PTR_ERR(clks->din_clk) != -ENOENT) {
			err = PTR_ERR(clks->din_clk);
			return err;
		}
		clks->din_clk = NULL;
	}

	clks->dout_clk = devm_clk_get(&pdev->dev, "m_axis_dout_aclk");
	if (IS_ERR(clks->dout_clk)) {
		if (PTR_ERR(clks->dout_clk) != -ENOENT) {
			err = PTR_ERR(clks->dout_clk);
			return err;
		}
		clks->dout_clk = NULL;
	}

	clks->dout_words_clk =
		devm_clk_get(&pdev->dev, "s_axis_dout_words_aclk");
	if (IS_ERR(clks->dout_words_clk)) {
		if (PTR_ERR(clks->dout_words_clk) != -ENOENT) {
			err = PTR_ERR(clks->dout_words_clk);
			return err;
		}
		clks->dout_words_clk = NULL;
	}

	clks->ctrl_clk = devm_clk_get(&pdev->dev, "s_axis_ctrl_aclk");
	if (IS_ERR(clks->ctrl_clk)) {
		if (PTR_ERR(clks->ctrl_clk) != -ENOENT) {
			err = PTR_ERR(clks->ctrl_clk);
			return err;
		}
		clks->ctrl_clk = NULL;
	}

	clks->status_clk = devm_clk_get(&pdev->dev, "m_axis_status_aclk");
	if (IS_ERR(clks->status_clk)) {
		if (PTR_ERR(clks->status_clk) != -ENOENT) {
			err = PTR_ERR(clks->status_clk);
			return err;
		}
		clks->status_clk = NULL;
	}

	err = clk_prepare_enable(clks->core_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable core_clk (%d)", err);
		return err;
	}

	err = clk_prepare_enable(clks->axi_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable axi_clk (%d)", err);
		goto err_disable_core_clk;
	}

	err = clk_prepare_enable(clks->din_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable din_clk (%d)", err);
		goto err_disable_axi_clk;
	}

	err = clk_prepare_enable(clks->din_words_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable din_words_clk (%d)", err);
		goto err_disable_din_clk;
	}

	err = clk_prepare_enable(clks->dout_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable dout_clk (%d)", err);
		goto err_disable_din_words_clk;
	}

	err = clk_prepare_enable(clks->dout_words_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable dout_words_clk (%d)",
			err);
		goto err_disable_dout_clk;
	}

	err = clk_prepare_enable(clks->ctrl_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable ctrl_clk (%d)", err);
		goto err_disable_dout_words_clk;
	}

	err = clk_prepare_enable(clks->status_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable status_clk (%d)\n", err);
		goto err_disable_ctrl_clk;
	}

	return err;

err_disable_ctrl_clk:
	clk_disable_unprepare(clks->ctrl_clk);
err_disable_dout_words_clk:
	clk_disable_unprepare(clks->dout_words_clk);
err_disable_dout_clk:
	clk_disable_unprepare(clks->dout_clk);
err_disable_din_words_clk:
	clk_disable_unprepare(clks->din_words_clk);
err_disable_din_clk:
	clk_disable_unprepare(clks->din_clk);
err_disable_axi_clk:
	clk_disable_unprepare(clks->axi_clk);
err_disable_core_clk:
	clk_disable_unprepare(clks->core_clk);

	return err;
}

static void xsdfec_disable_all_clks(struct xsdfec_clks *clks)
{
	clk_disable_unprepare(clks->status_clk);
	clk_disable_unprepare(clks->ctrl_clk);
	clk_disable_unprepare(clks->dout_words_clk);
	clk_disable_unprepare(clks->dout_clk);
	clk_disable_unprepare(clks->din_words_clk);
	clk_disable_unprepare(clks->din_clk);
	clk_disable_unprepare(clks->core_clk);
	clk_disable_unprepare(clks->axi_clk);
}

static void xsdfec_idr_remove(struct xsdfec_dev *xsdfec)
{
	mutex_lock(&dev_idr_lock);
	idr_remove(&dev_idr, xsdfec->dev_id);
	mutex_unlock(&dev_idr_lock);
}

static int xsdfec_probe(struct platform_device *pdev)
{
	struct xsdfec_dev *xsdfec;
	struct device *dev;
	struct resource *res;
	int err;

	xsdfec = devm_kzalloc(&pdev->dev, sizeof(*xsdfec), GFP_KERNEL);
	if (!xsdfec)
		return -ENOMEM;

	xsdfec->dev = &pdev->dev;
	spin_lock_init(&xsdfec->error_data_lock);

	err = xsdfec_clk_init(pdev, &xsdfec->clks);
	if (err)
		return err;

	dev = xsdfec->dev;
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	xsdfec->regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(xsdfec->regs)) {
		err = PTR_ERR(xsdfec->regs);
		goto err_xsdfec_dev;
	}

	/* Save driver private data */
	platform_set_drvdata(pdev, xsdfec);

	mutex_lock(&dev_idr_lock);
	err = idr_alloc(&dev_idr, xsdfec->dev_name, 0, 0, GFP_KERNEL);
	mutex_unlock(&dev_idr_lock);
	if (err < 0)
		goto err_xsdfec_dev;
	xsdfec->dev_id = err;

	snprintf(xsdfec->dev_name, DEV_NAME_LEN, "xsdfec%d", xsdfec->dev_id);
	xsdfec->miscdev.minor = MISC_DYNAMIC_MINOR;
	xsdfec->miscdev.name = xsdfec->dev_name;
	xsdfec->miscdev.fops = &xsdfec_fops;
	xsdfec->miscdev.parent = dev;
	err = misc_register(&xsdfec->miscdev);
	if (err) {
		dev_err(dev, "error:%d. Unable to register device", err);
		goto err_xsdfec_idr;
	}
	return 0;

err_xsdfec_idr:
	xsdfec_idr_remove(xsdfec);
err_xsdfec_dev:
	xsdfec_disable_all_clks(&xsdfec->clks);
	return err;
}

static int xsdfec_remove(struct platform_device *pdev)
{
	struct xsdfec_dev *xsdfec;

	xsdfec = platform_get_drvdata(pdev);
	misc_deregister(&xsdfec->miscdev);
	xsdfec_idr_remove(xsdfec);
	xsdfec_disable_all_clks(&xsdfec->clks);
	return 0;
}

static const struct of_device_id xsdfec_of_match[] = {
	{
		.compatible = "xlnx,sd-fec-1.1",
	},
	{ /* end of table */ }
};
MODULE_DEVICE_TABLE(of, xsdfec_of_match);

static struct platform_driver xsdfec_driver = {
	.driver = {
		.name = "xilinx-sdfec",
		.of_match_table = xsdfec_of_match,
	},
	.probe = xsdfec_probe,
	.remove =  xsdfec_remove,
};

static int __init xsdfec_init(void)
{
	int err;

	mutex_init(&dev_idr_lock);
	idr_init(&dev_idr);
	err = platform_driver_register(&xsdfec_driver);
	if (err < 0) {
		pr_err("%s Unabled to register SDFEC driver", __func__);
		return err;
	}
	return 0;
}

static void __exit xsdfec_exit(void)
{
	platform_driver_unregister(&xsdfec_driver);
	idr_destroy(&dev_idr);
}

module_init(xsdfec_init);
module_exit(xsdfec_exit);

MODULE_AUTHOR("Xilinx, Inc");
MODULE_DESCRIPTION("Xilinx SD-FEC16 Driver");
MODULE_LICENSE("GPL");