atmel-ssc.c (31974361761b18e07e821d3b262e34f1a2d105cb) atmel-ssc.c (2d6bed9ca93e98685bc5038d686984fd449cd978)
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.

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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
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.

--- 4 unchanged lines hidden (view full) ---

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) {
21/* Serialize access to ssc_list and user count */
22static DEFINE_SPINLOCK(user_lock);
23static LIST_HEAD(ssc_list);
24
25struct ssc_device *ssc_request(unsigned int ssc_num)
26{
27 int ssc_valid = 0;
28 struct ssc_device *ssc;
29
30 spin_lock(&user_lock);
31 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_valid = 1;
38 break;
39 }
40 } else if (ssc->pdev->id == ssc_num) {
32 if (ssc->pdev->id == ssc_num) {
41 ssc_valid = 1;
42 break;
43 }
44 }
45
46 if (!ssc_valid) {
47 spin_unlock(&user_lock);
48 pr_err("ssc: ssc%d platform device is missing\n", ssc_num);

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71 clk_disable(ssc->clk);
72 } else {
73 dev_dbg(&ssc->pdev->dev, "device already free\n");
74 }
75 spin_unlock(&user_lock);
76}
77EXPORT_SYMBOL(ssc_free);
78
33 ssc_valid = 1;
34 break;
35 }
36 }
37
38 if (!ssc_valid) {
39 spin_unlock(&user_lock);
40 pr_err("ssc: ssc%d platform device is missing\n", ssc_num);

--- 22 unchanged lines hidden (view full) ---

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