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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 | #include <linux/pinctrl/consumer.h> |
23 | |
24 | /* Serialize access to ssc_list and user count */ |
25 | static DEFINE_SPINLOCK(user_lock); |
26 | static LIST_HEAD(ssc_list); |
27 | |
28 | struct ssc_device *ssc_request(unsigned int ssc_num) |
29 | { |
30 | int ssc_valid = 0; |
31 | struct ssc_device *ssc; |
32 | |
33 | spin_lock(&user_lock); |
34 | list_for_each_entry(ssc, &ssc_list, list) { |
35 | if (ssc->pdev->dev.of_node) { |
36 | if (of_alias_get_id(ssc->pdev->dev.of_node, "ssc") |
37 | == 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_enable(ssc->clk); |
62 | |
63 | return ssc; |
64 | } |
65 | EXPORT_SYMBOL(ssc_request); |
66 | |
67 | void ssc_free(struct ssc_device *ssc) |
68 | { |
69 | spin_lock(&user_lock); |
70 | if (ssc->user) { |
71 | ssc->user--; |
72 | clk_disable(ssc->clk); |
73 | } else { |
74 | dev_dbg(&ssc->pdev->dev, "device already free\n"); |
75 | } |
76 | spin_unlock(&user_lock); |
77 | } |
78 | EXPORT_SYMBOL(ssc_free); |
79 | |
80 | static struct atmel_ssc_platform_data at91rm9200_config = { |
81 | .use_dma = 0, |
82 | }; |
83 | |
84 | static struct atmel_ssc_platform_data at91sam9g45_config = { |
85 | .use_dma = 1, |
86 | }; |
87 | |
88 | static const struct platform_device_id atmel_ssc_devtypes[] = { |
89 | { |
90 | .name = "at91rm9200_ssc", |
91 | .driver_data = (unsigned long) &at91rm9200_config, |
92 | }, { |
93 | .name = "at91sam9g45_ssc", |
94 | .driver_data = (unsigned long) &at91sam9g45_config, |
95 | }, { |
96 | /* sentinel */ |
97 | } |
98 | }; |
99 | |
100 | #ifdef CONFIG_OF |
101 | static const struct of_device_id atmel_ssc_dt_ids[] = { |
102 | { |
103 | .compatible = "atmel,at91rm9200-ssc", |
104 | .data = &at91rm9200_config, |
105 | }, { |
106 | .compatible = "atmel,at91sam9g45-ssc", |
107 | .data = &at91sam9g45_config, |
108 | }, { |
109 | /* sentinel */ |
110 | } |
111 | }; |
112 | MODULE_DEVICE_TABLE(of, atmel_ssc_dt_ids); |
113 | #endif |
114 | |
115 | static inline const struct atmel_ssc_platform_data * __init |
116 | atmel_ssc_get_driver_data(struct platform_device *pdev) |
117 | { |
118 | if (pdev->dev.of_node) { |
119 | const struct of_device_id *match; |
120 | match = of_match_node(atmel_ssc_dt_ids, pdev->dev.of_node); |
121 | if (match == NULL) |
122 | return NULL; |
123 | return match->data; |
124 | } |
125 | |
126 | return (struct atmel_ssc_platform_data *) |
127 | platform_get_device_id(pdev)->driver_data; |
128 | } |
129 | |
130 | static int ssc_probe(struct platform_device *pdev) |
131 | { |
132 | struct resource *regs; |
133 | struct ssc_device *ssc; |
134 | const struct atmel_ssc_platform_data *plat_dat; |
135 | struct pinctrl *pinctrl; |
136 | |
137 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
138 | if (IS_ERR(pinctrl)) { |
139 | dev_err(&pdev->dev, "Failed to request pinctrl\n"); |
140 | return PTR_ERR(pinctrl); |
141 | } |
142 | |
143 | ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL); |
144 | if (!ssc) { |
145 | dev_dbg(&pdev->dev, "out of memory\n"); |
146 | return -ENOMEM; |
147 | } |
148 | |
149 | ssc->pdev = pdev; |
150 | |
151 | plat_dat = atmel_ssc_get_driver_data(pdev); |
152 | if (!plat_dat) |
153 | return -ENODEV; |
154 | ssc->pdata = (struct atmel_ssc_platform_data *)plat_dat; |
155 | |
156 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
157 | if (!regs) { |
158 | dev_dbg(&pdev->dev, "no mmio resource defined\n"); |
159 | return -ENXIO; |
160 | } |
161 | |
162 | ssc->regs = devm_ioremap_resource(&pdev->dev, regs); |
163 | if (IS_ERR(ssc->regs)) |
164 | return PTR_ERR(ssc->regs); |
165 | |
166 | ssc->phybase = regs->start; |
167 | |
168 | ssc->clk = devm_clk_get(&pdev->dev, "pclk"); |
169 | if (IS_ERR(ssc->clk)) { |
170 | dev_dbg(&pdev->dev, "no pclk clock defined\n"); |
171 | return -ENXIO; |
172 | } |
173 | |
174 | /* disable all interrupts */ |
175 | clk_enable(ssc->clk); |
176 | ssc_writel(ssc->regs, IDR, -1); |
177 | ssc_readl(ssc->regs, SR); |
178 | clk_disable(ssc->clk); |
179 | |
180 | ssc->irq = platform_get_irq(pdev, 0); |
181 | if (!ssc->irq) { |
182 | dev_dbg(&pdev->dev, "could not get irq\n"); |
183 | return -ENXIO; |
184 | } |
185 | |
186 | spin_lock(&user_lock); |
187 | list_add_tail(&ssc->list, &ssc_list); |
188 | spin_unlock(&user_lock); |
189 | |
190 | platform_set_drvdata(pdev, ssc); |
191 | |
192 | dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n", |
193 | ssc->regs, ssc->irq); |
194 | |
195 | return 0; |
196 | } |
197 | |
198 | static int ssc_remove(struct platform_device *pdev) |
199 | { |
200 | struct ssc_device *ssc = platform_get_drvdata(pdev); |
201 | |
202 | spin_lock(&user_lock); |
203 | list_del(&ssc->list); |
204 | spin_unlock(&user_lock); |
205 | |
206 | return 0; |
207 | } |
208 | |
209 | static struct platform_driver ssc_driver = { |
210 | .driver = { |
211 | .name = "ssc", |
212 | .owner = THIS_MODULE, |
213 | .of_match_table = of_match_ptr(atmel_ssc_dt_ids), |
214 | }, |
215 | .id_table = atmel_ssc_devtypes, |
216 | .probe = ssc_probe, |
217 | .remove = ssc_remove, |
218 | }; |
219 | module_platform_driver(ssc_driver); |
220 | |
221 | MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>"); |
222 | MODULE_DESCRIPTION("SSC driver for Atmel AVR32 and AT91"); |
223 | MODULE_LICENSE("GPL"); |
224 | MODULE_ALIAS("platform:ssc"); |
225 |
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