1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Atmel SSC driver
  4 *
  5 * Copyright (C) 2007 Atmel Corporation
 
 
 
 
  6 */
  7
  8#include <linux/platform_device.h>
  9#include <linux/list.h>
 10#include <linux/clk.h>
 11#include <linux/err.h>
 12#include <linux/io.h>
 13#include <linux/mutex.h>
 14#include <linux/atmel-ssc.h>
 15#include <linux/slab.h>
 16#include <linux/module.h>
 17
 18#include <linux/of.h>
 19
 20#include "../../sound/soc/atmel/atmel_ssc_dai.h"
 21
 22/* Serialize access to ssc_list and user count */
 23static DEFINE_MUTEX(user_lock);
 24static LIST_HEAD(ssc_list);
 25
 26struct ssc_device *ssc_request(unsigned int ssc_num)
 27{
 28	int ssc_valid = 0;
 29	struct ssc_device *ssc;
 30
 31	mutex_lock(&user_lock);
 32	list_for_each_entry(ssc, &ssc_list, list) {
 33		if (ssc->pdev->dev.of_node) {
 34			if (of_alias_get_id(ssc->pdev->dev.of_node, "ssc")
 35				== ssc_num) {
 36				ssc->pdev->id = ssc_num;
 37				ssc_valid = 1;
 38				break;
 39			}
 40		} else if (ssc->pdev->id == ssc_num) {
 41			ssc_valid = 1;
 42			break;
 43		}
 44	}
 45
 46	if (!ssc_valid) {
 47		mutex_unlock(&user_lock);
 48		pr_err("ssc: ssc%d platform device is missing\n", ssc_num);
 49		return ERR_PTR(-ENODEV);
 50	}
 51
 52	if (ssc->user) {
 53		mutex_unlock(&user_lock);
 54		dev_dbg(&ssc->pdev->dev, "module busy\n");
 55		return ERR_PTR(-EBUSY);
 56	}
 57	ssc->user++;
 58	mutex_unlock(&user_lock);
 59
 60	clk_prepare(ssc->clk);
 61
 62	return ssc;
 63}
 64EXPORT_SYMBOL(ssc_request);
 65
 66void ssc_free(struct ssc_device *ssc)
 67{
 68	bool disable_clk = true;
 69
 70	mutex_lock(&user_lock);
 71	if (ssc->user)
 72		ssc->user--;
 73	else {
 74		disable_clk = false;
 75		dev_dbg(&ssc->pdev->dev, "device already free\n");
 76	}
 77	mutex_unlock(&user_lock);
 78
 79	if (disable_clk)
 80		clk_unprepare(ssc->clk);
 81}
 82EXPORT_SYMBOL(ssc_free);
 83
 84static struct atmel_ssc_platform_data at91rm9200_config = {
 85	.use_dma = 0,
 86	.has_fslen_ext = 0,
 87};
 88
 89static struct atmel_ssc_platform_data at91sam9rl_config = {
 90	.use_dma = 0,
 91	.has_fslen_ext = 1,
 92};
 93
 94static struct atmel_ssc_platform_data at91sam9g45_config = {
 95	.use_dma = 1,
 96	.has_fslen_ext = 1,
 97};
 98
 99static const struct platform_device_id atmel_ssc_devtypes[] = {
100	{
101		.name = "at91rm9200_ssc",
102		.driver_data = (unsigned long) &at91rm9200_config,
103	}, {
104		.name = "at91sam9rl_ssc",
105		.driver_data = (unsigned long) &at91sam9rl_config,
106	}, {
107		.name = "at91sam9g45_ssc",
108		.driver_data = (unsigned long) &at91sam9g45_config,
109	}, {
110		/* sentinel */
111	}
112};
113
114#ifdef CONFIG_OF
115static const struct of_device_id atmel_ssc_dt_ids[] = {
116	{
117		.compatible = "atmel,at91rm9200-ssc",
118		.data = &at91rm9200_config,
119	}, {
120		.compatible = "atmel,at91sam9rl-ssc",
121		.data = &at91sam9rl_config,
122	}, {
123		.compatible = "atmel,at91sam9g45-ssc",
124		.data = &at91sam9g45_config,
125	}, {
126		/* sentinel */
127	}
128};
129MODULE_DEVICE_TABLE(of, atmel_ssc_dt_ids);
130#endif
131
132static inline const struct atmel_ssc_platform_data *
133	atmel_ssc_get_driver_data(struct platform_device *pdev)
134{
135	if (pdev->dev.of_node) {
136		const struct of_device_id *match;
137		match = of_match_node(atmel_ssc_dt_ids, pdev->dev.of_node);
138		if (match == NULL)
139			return NULL;
140		return match->data;
141	}
142
143	return (struct atmel_ssc_platform_data *)
144		platform_get_device_id(pdev)->driver_data;
145}
146
147#ifdef CONFIG_SND_ATMEL_SOC_SSC
148static int ssc_sound_dai_probe(struct ssc_device *ssc)
149{
150	struct device_node *np = ssc->pdev->dev.of_node;
151	int ret;
152	int id;
153
154	ssc->sound_dai = false;
155
156	if (!of_property_present(np, "#sound-dai-cells"))
157		return 0;
158
159	id = of_alias_get_id(np, "ssc");
160	if (id < 0)
161		return id;
162
163	ret = atmel_ssc_set_audio(id);
164	ssc->sound_dai = !ret;
165
166	return ret;
167}
168
169static void ssc_sound_dai_remove(struct ssc_device *ssc)
170{
171	if (!ssc->sound_dai)
172		return;
173
174	atmel_ssc_put_audio(of_alias_get_id(ssc->pdev->dev.of_node, "ssc"));
175}
176#else
177static inline int ssc_sound_dai_probe(struct ssc_device *ssc)
178{
179	if (of_property_present(ssc->pdev->dev.of_node, "#sound-dai-cells"))
180		return -ENOTSUPP;
181
182	return 0;
183}
184
185static inline void ssc_sound_dai_remove(struct ssc_device *ssc)
186{
187}
188#endif
189
190static int ssc_probe(struct platform_device *pdev)
191{
192	struct resource *regs;
193	struct ssc_device *ssc;
194	const struct atmel_ssc_platform_data *plat_dat;
195
196	ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL);
197	if (!ssc) {
198		dev_dbg(&pdev->dev, "out of memory\n");
199		return -ENOMEM;
200	}
201
202	ssc->pdev = pdev;
203
204	plat_dat = atmel_ssc_get_driver_data(pdev);
205	if (!plat_dat)
206		return -ENODEV;
207	ssc->pdata = (struct atmel_ssc_platform_data *)plat_dat;
208
209	if (pdev->dev.of_node) {
210		struct device_node *np = pdev->dev.of_node;
211		ssc->clk_from_rk_pin =
212			of_property_read_bool(np, "atmel,clk-from-rk-pin");
213	}
214
215	ssc->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &regs);
 
216	if (IS_ERR(ssc->regs))
217		return PTR_ERR(ssc->regs);
218
219	ssc->phybase = regs->start;
220
221	ssc->clk = devm_clk_get(&pdev->dev, "pclk");
222	if (IS_ERR(ssc->clk)) {
223		dev_dbg(&pdev->dev, "no pclk clock defined\n");
224		return -ENXIO;
225	}
226
227	/* disable all interrupts */
228	clk_prepare_enable(ssc->clk);
229	ssc_writel(ssc->regs, IDR, -1);
230	ssc_readl(ssc->regs, SR);
231	clk_disable_unprepare(ssc->clk);
232
233	ssc->irq = platform_get_irq(pdev, 0);
234	if (ssc->irq < 0) {
235		dev_dbg(&pdev->dev, "could not get irq\n");
236		return ssc->irq;
237	}
238
239	mutex_lock(&user_lock);
240	list_add_tail(&ssc->list, &ssc_list);
241	mutex_unlock(&user_lock);
242
243	platform_set_drvdata(pdev, ssc);
244
245	dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n",
246			ssc->regs, ssc->irq);
247
248	if (ssc_sound_dai_probe(ssc))
249		dev_err(&pdev->dev, "failed to auto-setup ssc for audio\n");
250
251	return 0;
252}
253
254static void ssc_remove(struct platform_device *pdev)
255{
256	struct ssc_device *ssc = platform_get_drvdata(pdev);
257
258	ssc_sound_dai_remove(ssc);
259
260	mutex_lock(&user_lock);
261	list_del(&ssc->list);
262	mutex_unlock(&user_lock);
 
 
263}
264
265static struct platform_driver ssc_driver = {
266	.driver		= {
267		.name		= "ssc",
268		.of_match_table	= of_match_ptr(atmel_ssc_dt_ids),
269	},
270	.id_table	= atmel_ssc_devtypes,
271	.probe		= ssc_probe,
272	.remove		= ssc_remove,
273};
274module_platform_driver(ssc_driver);
275
276MODULE_AUTHOR("Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>");
277MODULE_DESCRIPTION("SSC driver for Atmel AT91");
278MODULE_LICENSE("GPL");
279MODULE_ALIAS("platform:ssc");

 
  1/*
  2 * Atmel SSC driver
  3 *
  4 * Copyright (C) 2007 Atmel Corporation
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License version 2 as
  8 * published by the Free Software Foundation.
  9 */
 10
 11#include <linux/platform_device.h>
 12#include <linux/list.h>
 13#include <linux/clk.h>
 14#include <linux/err.h>
 15#include <linux/io.h>
 16#include <linux/spinlock.h>
 17#include <linux/atmel-ssc.h>
 18#include <linux/slab.h>
 19#include <linux/module.h>
 20
 21#include <linux/of.h>
 22
 23#include "../../sound/soc/atmel/atmel_ssc_dai.h"
 24
 25/* Serialize access to ssc_list and user count */
 26static DEFINE_SPINLOCK(user_lock);
 27static LIST_HEAD(ssc_list);
 28
 29struct ssc_device *ssc_request(unsigned int ssc_num)
 30{
 31	int ssc_valid = 0;
 32	struct ssc_device *ssc;
 33
 34	spin_lock(&user_lock);
 35	list_for_each_entry(ssc, &ssc_list, list) {
 36		if (ssc->pdev->dev.of_node) {
 37			if (of_alias_get_id(ssc->pdev->dev.of_node, "ssc")
 38				== ssc_num) {
 39				ssc->pdev->id = ssc_num;
 40				ssc_valid = 1;
 41				break;
 42			}
 43		} else if (ssc->pdev->id == ssc_num) {
 44			ssc_valid = 1;
 45			break;
 46		}
 47	}
 48
 49	if (!ssc_valid) {
 50		spin_unlock(&user_lock);
 51		pr_err("ssc: ssc%d platform device is missing\n", ssc_num);
 52		return ERR_PTR(-ENODEV);
 53	}
 54
 55	if (ssc->user) {
 56		spin_unlock(&user_lock);
 57		dev_dbg(&ssc->pdev->dev, "module busy\n");
 58		return ERR_PTR(-EBUSY);
 59	}
 60	ssc->user++;
 61	spin_unlock(&user_lock);
 62
 63	clk_prepare(ssc->clk);
 64
 65	return ssc;
 66}
 67EXPORT_SYMBOL(ssc_request);
 68
 69void ssc_free(struct ssc_device *ssc)
 70{
 71	bool disable_clk = true;
 72
 73	spin_lock(&user_lock);
 74	if (ssc->user)
 75		ssc->user--;
 76	else {
 77		disable_clk = false;
 78		dev_dbg(&ssc->pdev->dev, "device already free\n");
 79	}
 80	spin_unlock(&user_lock);
 81
 82	if (disable_clk)
 83		clk_unprepare(ssc->clk);
 84}
 85EXPORT_SYMBOL(ssc_free);
 86
 87static struct atmel_ssc_platform_data at91rm9200_config = {
 88	.use_dma = 0,
 89	.has_fslen_ext = 0,
 90};
 91
 92static struct atmel_ssc_platform_data at91sam9rl_config = {
 93	.use_dma = 0,
 94	.has_fslen_ext = 1,
 95};
 96
 97static struct atmel_ssc_platform_data at91sam9g45_config = {
 98	.use_dma = 1,
 99	.has_fslen_ext = 1,
100};
101
102static const struct platform_device_id atmel_ssc_devtypes[] = {
103	{
104		.name = "at91rm9200_ssc",
105		.driver_data = (unsigned long) &at91rm9200_config,
106	}, {
107		.name = "at91sam9rl_ssc",
108		.driver_data = (unsigned long) &at91sam9rl_config,
109	}, {
110		.name = "at91sam9g45_ssc",
111		.driver_data = (unsigned long) &at91sam9g45_config,
112	}, {
113		/* sentinel */
114	}
115};
116
117#ifdef CONFIG_OF
118static const struct of_device_id atmel_ssc_dt_ids[] = {
119	{
120		.compatible = "atmel,at91rm9200-ssc",
121		.data = &at91rm9200_config,
122	}, {
123		.compatible = "atmel,at91sam9rl-ssc",
124		.data = &at91sam9rl_config,
125	}, {
126		.compatible = "atmel,at91sam9g45-ssc",
127		.data = &at91sam9g45_config,
128	}, {
129		/* sentinel */
130	}
131};
132MODULE_DEVICE_TABLE(of, atmel_ssc_dt_ids);
133#endif
134
135static inline const struct atmel_ssc_platform_data * __init
136	atmel_ssc_get_driver_data(struct platform_device *pdev)
137{
138	if (pdev->dev.of_node) {
139		const struct of_device_id *match;
140		match = of_match_node(atmel_ssc_dt_ids, pdev->dev.of_node);
141		if (match == NULL)
142			return NULL;
143		return match->data;
144	}
145
146	return (struct atmel_ssc_platform_data *)
147		platform_get_device_id(pdev)->driver_data;
148}
149
150#ifdef CONFIG_SND_ATMEL_SOC_SSC
151static int ssc_sound_dai_probe(struct ssc_device *ssc)
152{
153	struct device_node *np = ssc->pdev->dev.of_node;
154	int ret;
155	int id;
156
157	ssc->sound_dai = false;
158
159	if (!of_property_read_bool(np, "#sound-dai-cells"))
160		return 0;
161
162	id = of_alias_get_id(np, "ssc");
163	if (id < 0)
164		return id;
165
166	ret = atmel_ssc_set_audio(id);
167	ssc->sound_dai = !ret;
168
169	return ret;
170}
171
172static void ssc_sound_dai_remove(struct ssc_device *ssc)
173{
174	if (!ssc->sound_dai)
175		return;
176
177	atmel_ssc_put_audio(of_alias_get_id(ssc->pdev->dev.of_node, "ssc"));
178}
179#else
180static inline int ssc_sound_dai_probe(struct ssc_device *ssc)
181{
182	if (of_property_read_bool(ssc->pdev->dev.of_node, "#sound-dai-cells"))
183		return -ENOTSUPP;
184
185	return 0;
186}
187
188static inline void ssc_sound_dai_remove(struct ssc_device *ssc)
189{
190}
191#endif
192
193static int ssc_probe(struct platform_device *pdev)
194{
195	struct resource *regs;
196	struct ssc_device *ssc;
197	const struct atmel_ssc_platform_data *plat_dat;
198
199	ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL);
200	if (!ssc) {
201		dev_dbg(&pdev->dev, "out of memory\n");
202		return -ENOMEM;
203	}
204
205	ssc->pdev = pdev;
206
207	plat_dat = atmel_ssc_get_driver_data(pdev);
208	if (!plat_dat)
209		return -ENODEV;
210	ssc->pdata = (struct atmel_ssc_platform_data *)plat_dat;
211
212	if (pdev->dev.of_node) {
213		struct device_node *np = pdev->dev.of_node;
214		ssc->clk_from_rk_pin =
215			of_property_read_bool(np, "atmel,clk-from-rk-pin");
216	}
217
218	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
219	ssc->regs = devm_ioremap_resource(&pdev->dev, regs);
220	if (IS_ERR(ssc->regs))
221		return PTR_ERR(ssc->regs);
222
223	ssc->phybase = regs->start;
224
225	ssc->clk = devm_clk_get(&pdev->dev, "pclk");
226	if (IS_ERR(ssc->clk)) {
227		dev_dbg(&pdev->dev, "no pclk clock defined\n");
228		return -ENXIO;
229	}
230
231	/* disable all interrupts */
232	clk_prepare_enable(ssc->clk);
233	ssc_writel(ssc->regs, IDR, -1);
234	ssc_readl(ssc->regs, SR);
235	clk_disable_unprepare(ssc->clk);
236
237	ssc->irq = platform_get_irq(pdev, 0);
238	if (!ssc->irq) {
239		dev_dbg(&pdev->dev, "could not get irq\n");
240		return -ENXIO;
241	}
242
243	spin_lock(&user_lock);
244	list_add_tail(&ssc->list, &ssc_list);
245	spin_unlock(&user_lock);
246
247	platform_set_drvdata(pdev, ssc);
248
249	dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n",
250			ssc->regs, ssc->irq);
251
252	if (ssc_sound_dai_probe(ssc))
253		dev_err(&pdev->dev, "failed to auto-setup ssc for audio\n");
254
255	return 0;
256}
257
258static int ssc_remove(struct platform_device *pdev)
259{
260	struct ssc_device *ssc = platform_get_drvdata(pdev);
261
262	ssc_sound_dai_remove(ssc);
263
264	spin_lock(&user_lock);
265	list_del(&ssc->list);
266	spin_unlock(&user_lock);
267
268	return 0;
269}
270
271static struct platform_driver ssc_driver = {
272	.driver		= {
273		.name		= "ssc",
274		.of_match_table	= of_match_ptr(atmel_ssc_dt_ids),
275	},
276	.id_table	= atmel_ssc_devtypes,
277	.probe		= ssc_probe,
278	.remove		= ssc_remove,
279};
280module_platform_driver(ssc_driver);
281
282MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
283MODULE_DESCRIPTION("SSC driver for Atmel AVR32 and AT91");
284MODULE_LICENSE("GPL");
285MODULE_ALIAS("platform:ssc");