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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
eb1f2930 HCE |
2 | /* |
3 | * Atmel SSC driver | |
4 | * | |
5 | * Copyright (C) 2007 Atmel Corporation | |
eb1f2930 HCE |
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> | |
b037d60a | 13 | #include <linux/mutex.h> |
eb1f2930 | 14 | #include <linux/atmel-ssc.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
eb12a679 | 16 | #include <linux/module.h> |
eb1f2930 | 17 | |
099343c6 BS |
18 | #include <linux/of.h> |
19 | ||
e8314d7d PR |
20 | #include "../../sound/soc/atmel/atmel_ssc_dai.h" |
21 | ||
eb1f2930 | 22 | /* Serialize access to ssc_list and user count */ |
b037d60a | 23 | static DEFINE_MUTEX(user_lock); |
eb1f2930 HCE |
24 | static LIST_HEAD(ssc_list); |
25 | ||
26 | struct ssc_device *ssc_request(unsigned int ssc_num) | |
27 | { | |
28 | int ssc_valid = 0; | |
29 | struct ssc_device *ssc; | |
30 | ||
b037d60a | 31 | mutex_lock(&user_lock); |
eb1f2930 | 32 | list_for_each_entry(ssc, &ssc_list, list) { |
099343c6 BS |
33 | if (ssc->pdev->dev.of_node) { |
34 | if (of_alias_get_id(ssc->pdev->dev.of_node, "ssc") | |
35 | == ssc_num) { | |
c706f2e5 | 36 | ssc->pdev->id = ssc_num; |
099343c6 BS |
37 | ssc_valid = 1; |
38 | break; | |
39 | } | |
40 | } else if (ssc->pdev->id == ssc_num) { | |
eb1f2930 HCE |
41 | ssc_valid = 1; |
42 | break; | |
43 | } | |
44 | } | |
45 | ||
46 | if (!ssc_valid) { | |
b037d60a | 47 | mutex_unlock(&user_lock); |
dfecb716 | 48 | pr_err("ssc: ssc%d platform device is missing\n", ssc_num); |
eb1f2930 HCE |
49 | return ERR_PTR(-ENODEV); |
50 | } | |
51 | ||
52 | if (ssc->user) { | |
b037d60a | 53 | mutex_unlock(&user_lock); |
eb1f2930 HCE |
54 | dev_dbg(&ssc->pdev->dev, "module busy\n"); |
55 | return ERR_PTR(-EBUSY); | |
56 | } | |
57 | ssc->user++; | |
b037d60a | 58 | mutex_unlock(&user_lock); |
eb1f2930 | 59 | |
49af54ff | 60 | clk_prepare(ssc->clk); |
eb1f2930 HCE |
61 | |
62 | return ssc; | |
63 | } | |
64 | EXPORT_SYMBOL(ssc_request); | |
65 | ||
66 | void ssc_free(struct ssc_device *ssc) | |
67 | { | |
9a9b1c61 BB |
68 | bool disable_clk = true; |
69 | ||
b037d60a | 70 | mutex_lock(&user_lock); |
9a9b1c61 | 71 | if (ssc->user) |
eb1f2930 | 72 | ssc->user--; |
9a9b1c61 BB |
73 | else { |
74 | disable_clk = false; | |
eb1f2930 HCE |
75 | dev_dbg(&ssc->pdev->dev, "device already free\n"); |
76 | } | |
b037d60a | 77 | mutex_unlock(&user_lock); |
9a9b1c61 BB |
78 | |
79 | if (disable_clk) | |
49af54ff | 80 | clk_unprepare(ssc->clk); |
eb1f2930 HCE |
81 | } |
82 | EXPORT_SYMBOL(ssc_free); | |
83 | ||
636036d2 BS |
84 | static struct atmel_ssc_platform_data at91rm9200_config = { |
85 | .use_dma = 0, | |
c4027faf BS |
86 | .has_fslen_ext = 0, |
87 | }; | |
88 | ||
89 | static struct atmel_ssc_platform_data at91sam9rl_config = { | |
90 | .use_dma = 0, | |
91 | .has_fslen_ext = 1, | |
636036d2 BS |
92 | }; |
93 | ||
94 | static struct atmel_ssc_platform_data at91sam9g45_config = { | |
95 | .use_dma = 1, | |
c4027faf | 96 | .has_fslen_ext = 1, |
636036d2 BS |
97 | }; |
98 | ||
99 | static const struct platform_device_id atmel_ssc_devtypes[] = { | |
100 | { | |
101 | .name = "at91rm9200_ssc", | |
102 | .driver_data = (unsigned long) &at91rm9200_config, | |
c4027faf BS |
103 | }, { |
104 | .name = "at91sam9rl_ssc", | |
105 | .driver_data = (unsigned long) &at91sam9rl_config, | |
636036d2 BS |
106 | }, { |
107 | .name = "at91sam9g45_ssc", | |
108 | .driver_data = (unsigned long) &at91sam9g45_config, | |
109 | }, { | |
110 | /* sentinel */ | |
111 | } | |
112 | }; | |
113 | ||
099343c6 BS |
114 | #ifdef CONFIG_OF |
115 | static const struct of_device_id atmel_ssc_dt_ids[] = { | |
116 | { | |
117 | .compatible = "atmel,at91rm9200-ssc", | |
118 | .data = &at91rm9200_config, | |
c4027faf BS |
119 | }, { |
120 | .compatible = "atmel,at91sam9rl-ssc", | |
121 | .data = &at91sam9rl_config, | |
099343c6 BS |
122 | }, { |
123 | .compatible = "atmel,at91sam9g45-ssc", | |
124 | .data = &at91sam9g45_config, | |
125 | }, { | |
126 | /* sentinel */ | |
127 | } | |
128 | }; | |
129 | MODULE_DEVICE_TABLE(of, atmel_ssc_dt_ids); | |
130 | #endif | |
131 | ||
7c973012 | 132 | static inline const struct atmel_ssc_platform_data * |
099343c6 BS |
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 | ||
e8314d7d PR |
147 | #ifdef CONFIG_SND_ATMEL_SOC_SSC |
148 | static 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 | ||
169 | static 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 | |
177 | static 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 | ||
185 | static inline void ssc_sound_dai_remove(struct ssc_device *ssc) | |
186 | { | |
187 | } | |
188 | #endif | |
189 | ||
5c86ac69 | 190 | static int ssc_probe(struct platform_device *pdev) |
eb1f2930 | 191 | { |
eb1f2930 HCE |
192 | struct resource *regs; |
193 | struct ssc_device *ssc; | |
099343c6 | 194 | const struct atmel_ssc_platform_data *plat_dat; |
eb1f2930 | 195 | |
2e4de7b3 | 196 | ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL); |
eb1f2930 HCE |
197 | if (!ssc) { |
198 | dev_dbg(&pdev->dev, "out of memory\n"); | |
2e4de7b3 | 199 | return -ENOMEM; |
eb1f2930 HCE |
200 | } |
201 | ||
2e4de7b3 | 202 | ssc->pdev = pdev; |
099343c6 BS |
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; | |
2e4de7b3 | 208 | |
048d4ff8 BS |
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 | ||
c6695aad | 215 | ssc->regs = devm_platform_get_and_ioremap_resource(pdev, 0, ®s); |
1684789f TR |
216 | if (IS_ERR(ssc->regs)) |
217 | return PTR_ERR(ssc->regs); | |
2e4de7b3 | 218 | |
31974361 NF |
219 | ssc->phybase = regs->start; |
220 | ||
2e4de7b3 BS |
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; | |
eb1f2930 HCE |
225 | } |
226 | ||
227 | /* disable all interrupts */ | |
6f0d9479 | 228 | clk_prepare_enable(ssc->clk); |
f4319ff2 | 229 | ssc_writel(ssc->regs, IDR, -1); |
eb1f2930 | 230 | ssc_readl(ssc->regs, SR); |
6f0d9479 | 231 | clk_disable_unprepare(ssc->clk); |
eb1f2930 HCE |
232 | |
233 | ssc->irq = platform_get_irq(pdev, 0); | |
1c245358 | 234 | if (ssc->irq < 0) { |
eb1f2930 | 235 | dev_dbg(&pdev->dev, "could not get irq\n"); |
1c245358 | 236 | return ssc->irq; |
eb1f2930 HCE |
237 | } |
238 | ||
b037d60a | 239 | mutex_lock(&user_lock); |
eb1f2930 | 240 | list_add_tail(&ssc->list, &ssc_list); |
b037d60a | 241 | mutex_unlock(&user_lock); |
eb1f2930 HCE |
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 | ||
e8314d7d PR |
248 | if (ssc_sound_dai_probe(ssc)) |
249 | dev_err(&pdev->dev, "failed to auto-setup ssc for audio\n"); | |
250 | ||
2e4de7b3 | 251 | return 0; |
eb1f2930 HCE |
252 | } |
253 | ||
486a5c28 | 254 | static int ssc_remove(struct platform_device *pdev) |
eb1f2930 HCE |
255 | { |
256 | struct ssc_device *ssc = platform_get_drvdata(pdev); | |
257 | ||
e8314d7d PR |
258 | ssc_sound_dai_remove(ssc); |
259 | ||
b037d60a | 260 | mutex_lock(&user_lock); |
eb1f2930 | 261 | list_del(&ssc->list); |
b037d60a | 262 | mutex_unlock(&user_lock); |
eb1f2930 HCE |
263 | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static struct platform_driver ssc_driver = { | |
eb1f2930 HCE |
268 | .driver = { |
269 | .name = "ssc", | |
099343c6 | 270 | .of_match_table = of_match_ptr(atmel_ssc_dt_ids), |
eb1f2930 | 271 | }, |
636036d2 | 272 | .id_table = atmel_ssc_devtypes, |
5c86ac69 | 273 | .probe = ssc_probe, |
046e7d68 | 274 | .remove = ssc_remove, |
eb1f2930 | 275 | }; |
5c86ac69 | 276 | module_platform_driver(ssc_driver); |
eb1f2930 | 277 | |
62bf2fa7 HCNE |
278 | MODULE_AUTHOR("Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>"); |
279 | MODULE_DESCRIPTION("SSC driver for Atmel AT91"); | |
eb1f2930 | 280 | MODULE_LICENSE("GPL"); |
d6c23850 | 281 | MODULE_ALIAS("platform:ssc"); |