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/* Serialize access to ssc_list and user count */
 24static DEFINE_SPINLOCK(user_lock);
 25static LIST_HEAD(ssc_list);
 26
 27struct ssc_device *ssc_request(unsigned int ssc_num)
 28{
 29	int ssc_valid = 0;
 30	struct ssc_device *ssc;
 31
 32	spin_lock(&user_lock);
 33	list_for_each_entry(ssc, &ssc_list, list) {
 34		if (ssc->pdev->dev.of_node) {
 35			if (of_alias_get_id(ssc->pdev->dev.of_node, "ssc")
 36				== ssc_num) {
 37				ssc->pdev->id = ssc_num;
 38				ssc_valid = 1;
 39				break;
 40			}
 41		} else if (ssc->pdev->id == ssc_num) {
 42			ssc_valid = 1;
 43			break;
 44		}
 45	}
 46
 47	if (!ssc_valid) {
 48		spin_unlock(&user_lock);
 49		pr_err("ssc: ssc%d platform device is missing\n", ssc_num);
 50		return ERR_PTR(-ENODEV);
 51	}
 52
 53	if (ssc->user) {
 54		spin_unlock(&user_lock);
 55		dev_dbg(&ssc->pdev->dev, "module busy\n");
 56		return ERR_PTR(-EBUSY);
 57	}
 58	ssc->user++;
 59	spin_unlock(&user_lock);
 60
 61	clk_prepare(ssc->clk);
 62
 63	return ssc;
 64}
 65EXPORT_SYMBOL(ssc_request);
 66
 67void ssc_free(struct ssc_device *ssc)
 68{
 69	bool disable_clk = true;
 70
 71	spin_lock(&user_lock);
 72	if (ssc->user)
 73		ssc->user--;
 74	else {
 75		disable_clk = false;
 76		dev_dbg(&ssc->pdev->dev, "device already free\n");
 77	}
 78	spin_unlock(&user_lock);
 79
 80	if (disable_clk)
 81		clk_unprepare(ssc->clk);
 82}
 83EXPORT_SYMBOL(ssc_free);
 84
 85static struct atmel_ssc_platform_data at91rm9200_config = {
 86	.use_dma = 0,
 87	.has_fslen_ext = 0,
 88};
 89
 90static struct atmel_ssc_platform_data at91sam9rl_config = {
 91	.use_dma = 0,
 92	.has_fslen_ext = 1,
 93};
 94
 95static struct atmel_ssc_platform_data at91sam9g45_config = {
 96	.use_dma = 1,
 97	.has_fslen_ext = 1,
 98};
 99
100static const struct platform_device_id atmel_ssc_devtypes[] = {
101	{
102		.name = "at91rm9200_ssc",
103		.driver_data = (unsigned long) &at91rm9200_config,
104	}, {
105		.name = "at91sam9rl_ssc",
106		.driver_data = (unsigned long) &at91sam9rl_config,
107	}, {
108		.name = "at91sam9g45_ssc",
109		.driver_data = (unsigned long) &at91sam9g45_config,
110	}, {
111		/* sentinel */
112	}
113};
114
115#ifdef CONFIG_OF
116static const struct of_device_id atmel_ssc_dt_ids[] = {
117	{
118		.compatible = "atmel,at91rm9200-ssc",
119		.data = &at91rm9200_config,
120	}, {
121		.compatible = "atmel,at91sam9rl-ssc",
122		.data = &at91sam9rl_config,
123	}, {
124		.compatible = "atmel,at91sam9g45-ssc",
125		.data = &at91sam9g45_config,
126	}, {
127		/* sentinel */
128	}
129};
130MODULE_DEVICE_TABLE(of, atmel_ssc_dt_ids);
131#endif
132
133static inline const struct atmel_ssc_platform_data * __init
134	atmel_ssc_get_driver_data(struct platform_device *pdev)
135{
136	if (pdev->dev.of_node) {
137		const struct of_device_id *match;
138		match = of_match_node(atmel_ssc_dt_ids, pdev->dev.of_node);
139		if (match == NULL)
140			return NULL;
141		return match->data;
142	}
143
144	return (struct atmel_ssc_platform_data *)
145		platform_get_device_id(pdev)->driver_data;
146}
147
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
148static int ssc_probe(struct platform_device *pdev)
149{
150	struct resource *regs;
151	struct ssc_device *ssc;
152	const struct atmel_ssc_platform_data *plat_dat;
153
154	ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL);
155	if (!ssc) {
156		dev_dbg(&pdev->dev, "out of memory\n");
157		return -ENOMEM;
158	}
159
160	ssc->pdev = pdev;
161
162	plat_dat = atmel_ssc_get_driver_data(pdev);
163	if (!plat_dat)
164		return -ENODEV;
165	ssc->pdata = (struct atmel_ssc_platform_data *)plat_dat;
166
167	if (pdev->dev.of_node) {
168		struct device_node *np = pdev->dev.of_node;
169		ssc->clk_from_rk_pin =
170			of_property_read_bool(np, "atmel,clk-from-rk-pin");
171	}
172
173	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
174	ssc->regs = devm_ioremap_resource(&pdev->dev, regs);
175	if (IS_ERR(ssc->regs))
176		return PTR_ERR(ssc->regs);
177
178	ssc->phybase = regs->start;
179
180	ssc->clk = devm_clk_get(&pdev->dev, "pclk");
181	if (IS_ERR(ssc->clk)) {
182		dev_dbg(&pdev->dev, "no pclk clock defined\n");
183		return -ENXIO;
184	}
185
186	/* disable all interrupts */
187	clk_prepare_enable(ssc->clk);
188	ssc_writel(ssc->regs, IDR, -1);
189	ssc_readl(ssc->regs, SR);
190	clk_disable_unprepare(ssc->clk);
191
192	ssc->irq = platform_get_irq(pdev, 0);
193	if (!ssc->irq) {
194		dev_dbg(&pdev->dev, "could not get irq\n");
195		return -ENXIO;
196	}
197
198	spin_lock(&user_lock);
199	list_add_tail(&ssc->list, &ssc_list);
200	spin_unlock(&user_lock);
201
202	platform_set_drvdata(pdev, ssc);
203
204	dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n",
205			ssc->regs, ssc->irq);
206
 
 
 
207	return 0;
208}
209
210static int ssc_remove(struct platform_device *pdev)
211{
212	struct ssc_device *ssc = platform_get_drvdata(pdev);
213
214	spin_lock(&user_lock);
 
 
215	list_del(&ssc->list);
216	spin_unlock(&user_lock);
217
218	return 0;
219}
220
221static struct platform_driver ssc_driver = {
222	.driver		= {
223		.name		= "ssc",
224		.of_match_table	= of_match_ptr(atmel_ssc_dt_ids),
225	},
226	.id_table	= atmel_ssc_devtypes,
227	.probe		= ssc_probe,
228	.remove		= ssc_remove,
229};
230module_platform_driver(ssc_driver);
231
232MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
233MODULE_DESCRIPTION("SSC driver for Atmel AVR32 and AT91");
234MODULE_LICENSE("GPL");
235MODULE_ALIAS("platform:ssc");

  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_read_bool(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_read_bool(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	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
216	ssc->regs = devm_ioremap_resource(&pdev->dev, regs);
217	if (IS_ERR(ssc->regs))
218		return PTR_ERR(ssc->regs);
219
220	ssc->phybase = regs->start;
221
222	ssc->clk = devm_clk_get(&pdev->dev, "pclk");
223	if (IS_ERR(ssc->clk)) {
224		dev_dbg(&pdev->dev, "no pclk clock defined\n");
225		return -ENXIO;
226	}
227
228	/* disable all interrupts */
229	clk_prepare_enable(ssc->clk);
230	ssc_writel(ssc->regs, IDR, -1);
231	ssc_readl(ssc->regs, SR);
232	clk_disable_unprepare(ssc->clk);
233
234	ssc->irq = platform_get_irq(pdev, 0);
235	if (!ssc->irq) {
236		dev_dbg(&pdev->dev, "could not get irq\n");
237		return -ENXIO;
238	}
239
240	mutex_lock(&user_lock);
241	list_add_tail(&ssc->list, &ssc_list);
242	mutex_unlock(&user_lock);
243
244	platform_set_drvdata(pdev, ssc);
245
246	dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n",
247			ssc->regs, ssc->irq);
248
249	if (ssc_sound_dai_probe(ssc))
250		dev_err(&pdev->dev, "failed to auto-setup ssc for audio\n");
251
252	return 0;
253}
254
255static int ssc_remove(struct platform_device *pdev)
256{
257	struct ssc_device *ssc = platform_get_drvdata(pdev);
258
259	ssc_sound_dai_remove(ssc);
260
261	mutex_lock(&user_lock);
262	list_del(&ssc->list);
263	mutex_unlock(&user_lock);
264
265	return 0;
266}
267
268static struct platform_driver ssc_driver = {
269	.driver		= {
270		.name		= "ssc",
271		.of_match_table	= of_match_ptr(atmel_ssc_dt_ids),
272	},
273	.id_table	= atmel_ssc_devtypes,
274	.probe		= ssc_probe,
275	.remove		= ssc_remove,
276};
277module_platform_driver(ssc_driver);
278
279MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
280MODULE_DESCRIPTION("SSC driver for Atmel AVR32 and AT91");
281MODULE_LICENSE("GPL");
282MODULE_ALIAS("platform:ssc");