blob: 8a1432e8bb800114241492e6db5cfdcc841ae8bd [file] [log] [blame]
Michael Bueschebc915a2006-06-26 00:25:03 -07001/*
David Brownellc49a7f12008-04-16 19:24:42 +08002 * omap-rng.c - RNG driver for TI OMAP CPU family
Michael Bueschebc915a2006-06-26 00:25:03 -07003 *
4 * Author: Deepak Saxena <dsaxena@plexity.net>
5 *
6 * Copyright 2005 (c) MontaVista Software, Inc.
7 *
8 * Mostly based on original driver:
9 *
10 * Copyright (C) 2005 Nokia Corporation
Jan Engelhardt96de0e22007-10-19 23:21:04 +020011 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
Michael Bueschebc915a2006-06-26 00:25:03 -070012 *
13 * This file is licensed under the terms of the GNU General Public
14 * License version 2. This program is licensed "as is" without any
15 * warranty of any kind, whether express or implied.
Michael Bueschebc915a2006-06-26 00:25:03 -070016 */
17
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/random.h>
21#include <linux/err.h>
David Brownellaf2bc7d2006-08-05 12:14:04 -070022#include <linux/platform_device.h>
Michael Bueschebc915a2006-06-26 00:25:03 -070023#include <linux/hw_random.h>
Patrick McHardy984e9762007-11-21 12:24:45 +080024#include <linux/delay.h>
Paul Walmsley02666362012-09-23 17:28:26 -060025#include <linux/slab.h>
Paul Walmsley665d92f2012-09-23 17:28:26 -060026#include <linux/pm_runtime.h>
Lokesh Vutlac9039702013-08-05 20:17:21 +053027#include <linux/of.h>
28#include <linux/of_device.h>
29#include <linux/of_address.h>
Lokesh Vutlae83872c2013-08-05 20:17:23 +053030#include <linux/interrupt.h>
Michael Bueschebc915a2006-06-26 00:25:03 -070031
32#include <asm/io.h>
Michael Bueschebc915a2006-06-26 00:25:03 -070033
Lokesh Vutlae83872c2013-08-05 20:17:23 +053034#define RNG_REG_STATUS_RDY (1 << 0)
Michael Bueschebc915a2006-06-26 00:25:03 -070035
Lokesh Vutlae83872c2013-08-05 20:17:23 +053036#define RNG_REG_INTACK_RDY_MASK (1 << 0)
37#define RNG_REG_INTACK_SHUTDOWN_OFLO_MASK (1 << 1)
38#define RNG_SHUTDOWN_OFLO_MASK (1 << 1)
39
40#define RNG_CONTROL_STARTUP_CYCLES_SHIFT 16
41#define RNG_CONTROL_STARTUP_CYCLES_MASK (0xffff << 16)
42#define RNG_CONTROL_ENABLE_TRNG_SHIFT 10
43#define RNG_CONTROL_ENABLE_TRNG_MASK (1 << 10)
44
45#define RNG_CONFIG_MAX_REFIL_CYCLES_SHIFT 16
46#define RNG_CONFIG_MAX_REFIL_CYCLES_MASK (0xffff << 16)
47#define RNG_CONFIG_MIN_REFIL_CYCLES_SHIFT 0
48#define RNG_CONFIG_MIN_REFIL_CYCLES_MASK (0xff << 0)
49
50#define RNG_CONTROL_STARTUP_CYCLES 0xff
51#define RNG_CONFIG_MIN_REFIL_CYCLES 0x21
52#define RNG_CONFIG_MAX_REFIL_CYCLES 0x22
53
54#define RNG_ALARMCNT_ALARM_TH_SHIFT 0x0
55#define RNG_ALARMCNT_ALARM_TH_MASK (0xff << 0)
56#define RNG_ALARMCNT_SHUTDOWN_TH_SHIFT 16
57#define RNG_ALARMCNT_SHUTDOWN_TH_MASK (0x1f << 16)
58#define RNG_ALARM_THRESHOLD 0xff
59#define RNG_SHUTDOWN_THRESHOLD 0x4
60
61#define RNG_REG_FROENABLE_MASK 0xffffff
62#define RNG_REG_FRODETUNE_MASK 0xffffff
63
64#define OMAP2_RNG_OUTPUT_SIZE 0x4
65#define OMAP4_RNG_OUTPUT_SIZE 0x8
66
67enum {
68 RNG_OUTPUT_L_REG = 0,
69 RNG_OUTPUT_H_REG,
70 RNG_STATUS_REG,
71 RNG_INTMASK_REG,
72 RNG_INTACK_REG,
73 RNG_CONTROL_REG,
74 RNG_CONFIG_REG,
75 RNG_ALARMCNT_REG,
76 RNG_FROENABLE_REG,
77 RNG_FRODETUNE_REG,
78 RNG_ALARMMASK_REG,
79 RNG_ALARMSTOP_REG,
80 RNG_REV_REG,
81 RNG_SYSCONFIG_REG,
Paul Walmsley02666362012-09-23 17:28:26 -060082};
Michael Bueschebc915a2006-06-26 00:25:03 -070083
Lokesh Vutlae83872c2013-08-05 20:17:23 +053084static const u16 reg_map_omap2[] = {
85 [RNG_OUTPUT_L_REG] = 0x0,
86 [RNG_STATUS_REG] = 0x4,
87 [RNG_CONFIG_REG] = 0x28,
88 [RNG_REV_REG] = 0x3c,
89 [RNG_SYSCONFIG_REG] = 0x40,
90};
91
92static const u16 reg_map_omap4[] = {
93 [RNG_OUTPUT_L_REG] = 0x0,
94 [RNG_OUTPUT_H_REG] = 0x4,
95 [RNG_STATUS_REG] = 0x8,
96 [RNG_INTMASK_REG] = 0xc,
97 [RNG_INTACK_REG] = 0x10,
98 [RNG_CONTROL_REG] = 0x14,
99 [RNG_CONFIG_REG] = 0x18,
100 [RNG_ALARMCNT_REG] = 0x1c,
101 [RNG_FROENABLE_REG] = 0x20,
102 [RNG_FRODETUNE_REG] = 0x24,
103 [RNG_ALARMMASK_REG] = 0x28,
104 [RNG_ALARMSTOP_REG] = 0x2c,
105 [RNG_REV_REG] = 0x1FE0,
106 [RNG_SYSCONFIG_REG] = 0x1FE4,
107};
108
109struct omap_rng_dev;
110/**
111 * struct omap_rng_pdata - RNG IP block-specific data
112 * @regs: Pointer to the register offsets structure.
113 * @data_size: No. of bytes in RNG output.
114 * @data_present: Callback to determine if data is available.
115 * @init: Callback for IP specific initialization sequence.
116 * @cleanup: Callback for IP specific cleanup sequence.
117 */
118struct omap_rng_pdata {
119 u16 *regs;
120 u32 data_size;
121 u32 (*data_present)(struct omap_rng_dev *priv);
122 int (*init)(struct omap_rng_dev *priv);
123 void (*cleanup)(struct omap_rng_dev *priv);
124};
125
126struct omap_rng_dev {
127 void __iomem *base;
128 struct device *dev;
129 const struct omap_rng_pdata *pdata;
130};
131
132static inline u32 omap_rng_read(struct omap_rng_dev *priv, u16 reg)
Michael Bueschebc915a2006-06-26 00:25:03 -0700133{
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530134 return __raw_readl(priv->base + priv->pdata->regs[reg]);
Michael Bueschebc915a2006-06-26 00:25:03 -0700135}
136
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530137static inline void omap_rng_write(struct omap_rng_dev *priv, u16 reg,
138 u32 val)
Michael Bueschebc915a2006-06-26 00:25:03 -0700139{
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530140 __raw_writel(val, priv->base + priv->pdata->regs[reg]);
141}
142
Patrick McHardy984e9762007-11-21 12:24:45 +0800143static int omap_rng_data_present(struct hwrng *rng, int wait)
Michael Bueschebc915a2006-06-26 00:25:03 -0700144{
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530145 struct omap_rng_dev *priv;
Patrick McHardy984e9762007-11-21 12:24:45 +0800146 int data, i;
147
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530148 priv = (struct omap_rng_dev *)rng->priv;
Paul Walmsley02666362012-09-23 17:28:26 -0600149
Patrick McHardy984e9762007-11-21 12:24:45 +0800150 for (i = 0; i < 20; i++) {
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530151 data = priv->pdata->data_present(priv);
Patrick McHardy984e9762007-11-21 12:24:45 +0800152 if (data || !wait)
153 break;
David Brownellc49a7f12008-04-16 19:24:42 +0800154 /* RNG produces data fast enough (2+ MBit/sec, even
155 * during "rngtest" loads, that these delays don't
156 * seem to trigger. We *could* use the RNG IRQ, but
157 * that'd be higher overhead ... so why bother?
158 */
Patrick McHardy984e9762007-11-21 12:24:45 +0800159 udelay(10);
160 }
161 return data;
Michael Bueschebc915a2006-06-26 00:25:03 -0700162}
163
164static int omap_rng_data_read(struct hwrng *rng, u32 *data)
165{
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530166 struct omap_rng_dev *priv;
167 u32 data_size, i;
Michael Bueschebc915a2006-06-26 00:25:03 -0700168
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530169 priv = (struct omap_rng_dev *)rng->priv;
170 data_size = priv->pdata->data_size;
Paul Walmsley02666362012-09-23 17:28:26 -0600171
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530172 for (i = 0; i < data_size / sizeof(u32); i++)
173 data[i] = omap_rng_read(priv, RNG_OUTPUT_L_REG + i);
Paul Walmsley02666362012-09-23 17:28:26 -0600174
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530175 if (priv->pdata->regs[RNG_INTACK_REG])
176 omap_rng_write(priv, RNG_INTACK_REG, RNG_REG_INTACK_RDY_MASK);
177 return data_size;
178}
179
Olof Johanssona2469682013-08-20 11:07:53 -0700180static int omap_rng_init(struct hwrng *rng)
181{
182 struct omap_rng_dev *priv;
183
184 priv = (struct omap_rng_dev *)rng->priv;
185 return priv->pdata->init(priv);
186}
187
188static void omap_rng_cleanup(struct hwrng *rng)
189{
190 struct omap_rng_dev *priv;
191
192 priv = (struct omap_rng_dev *)rng->priv;
193 priv->pdata->cleanup(priv);
194}
195
196static struct hwrng omap_rng_ops = {
197 .name = "omap",
198 .data_present = omap_rng_data_present,
199 .data_read = omap_rng_data_read,
200 .init = omap_rng_init,
201 .cleanup = omap_rng_cleanup,
202};
203
204static inline u32 omap2_rng_data_present(struct omap_rng_dev *priv)
205{
206 return omap_rng_read(priv, RNG_STATUS_REG) ? 0 : 1;
207}
208
209static int omap2_rng_init(struct omap_rng_dev *priv)
210{
211 omap_rng_write(priv, RNG_SYSCONFIG_REG, 0x1);
212 return 0;
213}
214
215static void omap2_rng_cleanup(struct omap_rng_dev *priv)
216{
217 omap_rng_write(priv, RNG_SYSCONFIG_REG, 0x0);
218}
219
220static struct omap_rng_pdata omap2_rng_pdata = {
221 .regs = (u16 *)reg_map_omap2,
222 .data_size = OMAP2_RNG_OUTPUT_SIZE,
223 .data_present = omap2_rng_data_present,
224 .init = omap2_rng_init,
225 .cleanup = omap2_rng_cleanup,
226};
227
228#if defined(CONFIG_OF)
229static inline u32 omap4_rng_data_present(struct omap_rng_dev *priv)
230{
231 return omap_rng_read(priv, RNG_STATUS_REG) & RNG_REG_STATUS_RDY;
232}
233
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530234static int omap4_rng_init(struct omap_rng_dev *priv)
235{
236 u32 val;
237
238 /* Return if RNG is already running. */
Andre Wolokita656d7e72015-03-16 12:54:50 +1100239 if (omap_rng_read(priv, RNG_CONTROL_REG) & RNG_CONTROL_ENABLE_TRNG_MASK)
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530240 return 0;
241
242 val = RNG_CONFIG_MIN_REFIL_CYCLES << RNG_CONFIG_MIN_REFIL_CYCLES_SHIFT;
243 val |= RNG_CONFIG_MAX_REFIL_CYCLES << RNG_CONFIG_MAX_REFIL_CYCLES_SHIFT;
244 omap_rng_write(priv, RNG_CONFIG_REG, val);
245
246 omap_rng_write(priv, RNG_FRODETUNE_REG, 0x0);
247 omap_rng_write(priv, RNG_FROENABLE_REG, RNG_REG_FROENABLE_MASK);
248 val = RNG_ALARM_THRESHOLD << RNG_ALARMCNT_ALARM_TH_SHIFT;
249 val |= RNG_SHUTDOWN_THRESHOLD << RNG_ALARMCNT_SHUTDOWN_TH_SHIFT;
250 omap_rng_write(priv, RNG_ALARMCNT_REG, val);
251
252 val = RNG_CONTROL_STARTUP_CYCLES << RNG_CONTROL_STARTUP_CYCLES_SHIFT;
253 val |= RNG_CONTROL_ENABLE_TRNG_MASK;
254 omap_rng_write(priv, RNG_CONTROL_REG, val);
255
256 return 0;
257}
258
259static void omap4_rng_cleanup(struct omap_rng_dev *priv)
260{
261 int val;
262
263 val = omap_rng_read(priv, RNG_CONTROL_REG);
264 val &= ~RNG_CONTROL_ENABLE_TRNG_MASK;
Andre Wolokita1a5addf2015-03-16 10:19:11 +1100265 omap_rng_write(priv, RNG_CONTROL_REG, val);
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530266}
267
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530268static irqreturn_t omap4_rng_irq(int irq, void *dev_id)
269{
270 struct omap_rng_dev *priv = dev_id;
271 u32 fro_detune, fro_enable;
272
273 /*
274 * Interrupt raised by a fro shutdown threshold, do the following:
275 * 1. Clear the alarm events.
276 * 2. De tune the FROs which are shutdown.
277 * 3. Re enable the shutdown FROs.
278 */
279 omap_rng_write(priv, RNG_ALARMMASK_REG, 0x0);
280 omap_rng_write(priv, RNG_ALARMSTOP_REG, 0x0);
281
282 fro_enable = omap_rng_read(priv, RNG_FROENABLE_REG);
283 fro_detune = ~fro_enable & RNG_REG_FRODETUNE_MASK;
284 fro_detune = fro_detune | omap_rng_read(priv, RNG_FRODETUNE_REG);
285 fro_enable = RNG_REG_FROENABLE_MASK;
286
287 omap_rng_write(priv, RNG_FRODETUNE_REG, fro_detune);
288 omap_rng_write(priv, RNG_FROENABLE_REG, fro_enable);
289
290 omap_rng_write(priv, RNG_INTACK_REG, RNG_REG_INTACK_SHUTDOWN_OFLO_MASK);
291
292 return IRQ_HANDLED;
Michael Bueschebc915a2006-06-26 00:25:03 -0700293}
294
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530295static struct omap_rng_pdata omap4_rng_pdata = {
296 .regs = (u16 *)reg_map_omap4,
297 .data_size = OMAP4_RNG_OUTPUT_SIZE,
298 .data_present = omap4_rng_data_present,
299 .init = omap4_rng_init,
300 .cleanup = omap4_rng_cleanup,
301};
302
Lokesh Vutlac9039702013-08-05 20:17:21 +0530303static const struct of_device_id omap_rng_of_match[] = {
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530304 {
305 .compatible = "ti,omap2-rng",
306 .data = &omap2_rng_pdata,
307 },
308 {
309 .compatible = "ti,omap4-rng",
310 .data = &omap4_rng_pdata,
311 },
Lokesh Vutlac9039702013-08-05 20:17:21 +0530312 {},
313};
314MODULE_DEVICE_TABLE(of, omap_rng_of_match);
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530315
316static int of_get_omap_rng_device_details(struct omap_rng_dev *priv,
317 struct platform_device *pdev)
318{
319 const struct of_device_id *match;
320 struct device *dev = &pdev->dev;
321 int irq, err;
322
323 match = of_match_device(of_match_ptr(omap_rng_of_match), dev);
324 if (!match) {
325 dev_err(dev, "no compatible OF match\n");
326 return -EINVAL;
327 }
328 priv->pdata = match->data;
329
330 if (of_device_is_compatible(dev->of_node, "ti,omap4-rng")) {
331 irq = platform_get_irq(pdev, 0);
332 if (irq < 0) {
333 dev_err(dev, "%s: error getting IRQ resource - %d\n",
334 __func__, irq);
335 return irq;
336 }
337
338 err = devm_request_irq(dev, irq, omap4_rng_irq,
339 IRQF_TRIGGER_NONE, dev_name(dev), priv);
340 if (err) {
341 dev_err(dev, "unable to request irq %d, err = %d\n",
342 irq, err);
343 return err;
344 }
345 omap_rng_write(priv, RNG_INTMASK_REG, RNG_SHUTDOWN_OFLO_MASK);
346 }
347 return 0;
348}
349#else
350static int of_get_omap_rng_device_details(struct omap_rng_dev *omap_rng,
351 struct platform_device *pdev)
352{
353 return -EINVAL;
354}
Lokesh Vutlac9039702013-08-05 20:17:21 +0530355#endif
356
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530357static int get_omap_rng_device_details(struct omap_rng_dev *omap_rng)
358{
359 /* Only OMAP2/3 can be non-DT */
360 omap_rng->pdata = &omap2_rng_pdata;
361 return 0;
362}
363
Greg Kroah-Hartmanbcd29822012-12-21 15:12:08 -0800364static int omap_rng_probe(struct platform_device *pdev)
Michael Bueschebc915a2006-06-26 00:25:03 -0700365{
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530366 struct omap_rng_dev *priv;
367 struct resource *res;
368 struct device *dev = &pdev->dev;
Michael Bueschebc915a2006-06-26 00:25:03 -0700369 int ret;
370
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530371 priv = devm_kzalloc(dev, sizeof(struct omap_rng_dev), GFP_KERNEL);
Jingoo Han9e9026a2014-04-29 17:15:36 +0900372 if (!priv)
Paul Walmsley02666362012-09-23 17:28:26 -0600373 return -ENOMEM;
Paul Walmsley02666362012-09-23 17:28:26 -0600374
375 omap_rng_ops.priv = (unsigned long)priv;
Jingoo Han1f539bc2013-05-29 09:47:29 +0900376 platform_set_drvdata(pdev, priv);
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530377 priv->dev = dev;
Michael Bueschebc915a2006-06-26 00:25:03 -0700378
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530379 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
380 priv->base = devm_ioremap_resource(dev, res);
Thierry Redingc7c9e1c2013-01-21 11:08:59 +0100381 if (IS_ERR(priv->base)) {
382 ret = PTR_ERR(priv->base);
Russell King55c381e2008-09-04 14:07:22 +0100383 goto err_ioremap;
384 }
Michael Bueschebc915a2006-06-26 00:25:03 -0700385
Paul Walmsley665d92f2012-09-23 17:28:26 -0600386 pm_runtime_enable(&pdev->dev);
387 pm_runtime_get_sync(&pdev->dev);
388
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530389 ret = (dev->of_node) ? of_get_omap_rng_device_details(priv, pdev) :
390 get_omap_rng_device_details(priv);
391 if (ret)
392 goto err_ioremap;
393
Michael Bueschebc915a2006-06-26 00:25:03 -0700394 ret = hwrng_register(&omap_rng_ops);
Russell King55c381e2008-09-04 14:07:22 +0100395 if (ret)
396 goto err_register;
Michael Bueschebc915a2006-06-26 00:25:03 -0700397
David Brownellaf2bc7d2006-08-05 12:14:04 -0700398 dev_info(&pdev->dev, "OMAP Random Number Generator ver. %02x\n",
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530399 omap_rng_read(priv, RNG_REV_REG));
Michael Bueschebc915a2006-06-26 00:25:03 -0700400
401 return 0;
Russell King55c381e2008-09-04 14:07:22 +0100402
403err_register:
Paul Walmsley02666362012-09-23 17:28:26 -0600404 priv->base = NULL;
Paul Walmsley665d92f2012-09-23 17:28:26 -0600405 pm_runtime_disable(&pdev->dev);
Russell King55c381e2008-09-04 14:07:22 +0100406err_ioremap:
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530407 dev_err(dev, "initialization failed.\n");
Russell King55c381e2008-09-04 14:07:22 +0100408 return ret;
Michael Bueschebc915a2006-06-26 00:25:03 -0700409}
410
Dmitry Torokhov1ee9b5e2015-03-09 10:36:35 -0700411static int omap_rng_remove(struct platform_device *pdev)
Michael Bueschebc915a2006-06-26 00:25:03 -0700412{
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530413 struct omap_rng_dev *priv = platform_get_drvdata(pdev);
Paul Walmsley02666362012-09-23 17:28:26 -0600414
Michael Bueschebc915a2006-06-26 00:25:03 -0700415 hwrng_unregister(&omap_rng_ops);
416
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530417 priv->pdata->cleanup(priv);
Paul Walmsley02666362012-09-23 17:28:26 -0600418
Paul Walmsley665d92f2012-09-23 17:28:26 -0600419 pm_runtime_put_sync(&pdev->dev);
420 pm_runtime_disable(&pdev->dev);
Michael Bueschebc915a2006-06-26 00:25:03 -0700421
Michael Bueschebc915a2006-06-26 00:25:03 -0700422 return 0;
423}
424
Dmitry Torokhova308d662015-03-11 14:08:36 -0700425static int __maybe_unused omap_rng_suspend(struct device *dev)
Michael Bueschebc915a2006-06-26 00:25:03 -0700426{
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530427 struct omap_rng_dev *priv = dev_get_drvdata(dev);
Paul Walmsley02666362012-09-23 17:28:26 -0600428
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530429 priv->pdata->cleanup(priv);
Paul Walmsley665d92f2012-09-23 17:28:26 -0600430 pm_runtime_put_sync(dev);
Paul Walmsley02666362012-09-23 17:28:26 -0600431
Michael Bueschebc915a2006-06-26 00:25:03 -0700432 return 0;
433}
434
Dmitry Torokhova308d662015-03-11 14:08:36 -0700435static int __maybe_unused omap_rng_resume(struct device *dev)
Michael Bueschebc915a2006-06-26 00:25:03 -0700436{
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530437 struct omap_rng_dev *priv = dev_get_drvdata(dev);
Paul Walmsley02666362012-09-23 17:28:26 -0600438
Paul Walmsley665d92f2012-09-23 17:28:26 -0600439 pm_runtime_get_sync(dev);
Lokesh Vutlae83872c2013-08-05 20:17:23 +0530440 priv->pdata->init(priv);
Paul Walmsley02666362012-09-23 17:28:26 -0600441
David Brownellaf2bc7d2006-08-05 12:14:04 -0700442 return 0;
Michael Bueschebc915a2006-06-26 00:25:03 -0700443}
444
Rafael J. Wysocki76505722012-07-06 19:08:53 +0200445static SIMPLE_DEV_PM_OPS(omap_rng_pm, omap_rng_suspend, omap_rng_resume);
Michael Bueschebc915a2006-06-26 00:25:03 -0700446
David Brownellaf2bc7d2006-08-05 12:14:04 -0700447static struct platform_driver omap_rng_driver = {
448 .driver = {
449 .name = "omap_rng",
Dmitry Torokhova308d662015-03-11 14:08:36 -0700450 .pm = &omap_rng_pm,
Lokesh Vutlac9039702013-08-05 20:17:21 +0530451 .of_match_table = of_match_ptr(omap_rng_of_match),
David Brownellaf2bc7d2006-08-05 12:14:04 -0700452 },
Michael Bueschebc915a2006-06-26 00:25:03 -0700453 .probe = omap_rng_probe,
Dmitry Torokhov1ee9b5e2015-03-09 10:36:35 -0700454 .remove = omap_rng_remove,
Michael Bueschebc915a2006-06-26 00:25:03 -0700455};
456
Lokesh Vutla4390f772013-08-05 20:17:18 +0530457module_platform_driver(omap_rng_driver);
458MODULE_ALIAS("platform:omap_rng");
Michael Bueschebc915a2006-06-26 00:25:03 -0700459MODULE_AUTHOR("Deepak Saxena (and others)");
460MODULE_LICENSE("GPL");