1#include <linux/atmel_tc.h>
2#include <linux/clk.h>
3#include <linux/err.h>
4#include <linux/init.h>
5#include <linux/io.h>
6#include <linux/ioport.h>
7#include <linux/kernel.h>
8#include <linux/platform_device.h>
9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/export.h>
12#include <linux/of.h>
13
14
15
16
17
18
19
20#if defined(CONFIG_AVR32)
21
22const u8 atmel_tc_divisors[5] = { 0, 4, 8, 16, 32, };
23EXPORT_SYMBOL(atmel_tc_divisors);
24
25#elif defined(CONFIG_ARCH_AT91)
26
27const u8 atmel_tc_divisors[5] = { 2, 8, 32, 128, 0, };
28EXPORT_SYMBOL(atmel_tc_divisors);
29
30#endif
31
32static DEFINE_SPINLOCK(tc_list_lock);
33static LIST_HEAD(tc_list);
34
35
36
37
38
39
40
41
42
43struct atmel_tc *atmel_tc_alloc(unsigned block)
44{
45 struct atmel_tc *tc;
46 struct platform_device *pdev = NULL;
47
48 spin_lock(&tc_list_lock);
49 list_for_each_entry(tc, &tc_list, node) {
50 if (tc->allocated)
51 continue;
52
53 if ((tc->pdev->dev.of_node && tc->id == block) ||
54 (tc->pdev->id == block)) {
55 pdev = tc->pdev;
56 tc->allocated = true;
57 break;
58 }
59 }
60 spin_unlock(&tc_list_lock);
61
62 return pdev ? tc : NULL;
63}
64EXPORT_SYMBOL_GPL(atmel_tc_alloc);
65
66
67
68
69
70
71
72
73void atmel_tc_free(struct atmel_tc *tc)
74{
75 spin_lock(&tc_list_lock);
76 if (tc->allocated)
77 tc->allocated = false;
78 spin_unlock(&tc_list_lock);
79}
80EXPORT_SYMBOL_GPL(atmel_tc_free);
81
82#if defined(CONFIG_OF)
83static struct atmel_tcb_config tcb_rm9200_config = {
84 .counter_width = 16,
85};
86
87static struct atmel_tcb_config tcb_sam9x5_config = {
88 .counter_width = 32,
89};
90
91static const struct of_device_id atmel_tcb_dt_ids[] = {
92 {
93 .compatible = "atmel,at91rm9200-tcb",
94 .data = &tcb_rm9200_config,
95 }, {
96 .compatible = "atmel,at91sam9x5-tcb",
97 .data = &tcb_sam9x5_config,
98 }, {
99
100 }
101};
102
103MODULE_DEVICE_TABLE(of, atmel_tcb_dt_ids);
104#endif
105
106static int __init tc_probe(struct platform_device *pdev)
107{
108 struct atmel_tc *tc;
109 struct clk *clk;
110 int irq;
111 struct resource *r;
112 unsigned int i;
113
114 irq = platform_get_irq(pdev, 0);
115 if (irq < 0)
116 return -EINVAL;
117
118 tc = devm_kzalloc(&pdev->dev, sizeof(struct atmel_tc), GFP_KERNEL);
119 if (!tc)
120 return -ENOMEM;
121
122 tc->pdev = pdev;
123
124 clk = devm_clk_get(&pdev->dev, "t0_clk");
125 if (IS_ERR(clk))
126 return PTR_ERR(clk);
127
128 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
129 tc->regs = devm_ioremap_resource(&pdev->dev, r);
130 if (IS_ERR(tc->regs))
131 return PTR_ERR(tc->regs);
132
133
134 if (pdev->dev.of_node) {
135 const struct of_device_id *match;
136 match = of_match_node(atmel_tcb_dt_ids, pdev->dev.of_node);
137 if (match)
138 tc->tcb_config = match->data;
139
140 tc->id = of_alias_get_id(tc->pdev->dev.of_node, "tcb");
141 } else {
142 tc->id = pdev->id;
143 }
144
145 tc->clk[0] = clk;
146 tc->clk[1] = devm_clk_get(&pdev->dev, "t1_clk");
147 if (IS_ERR(tc->clk[1]))
148 tc->clk[1] = clk;
149 tc->clk[2] = devm_clk_get(&pdev->dev, "t2_clk");
150 if (IS_ERR(tc->clk[2]))
151 tc->clk[2] = clk;
152
153 tc->irq[0] = irq;
154 tc->irq[1] = platform_get_irq(pdev, 1);
155 if (tc->irq[1] < 0)
156 tc->irq[1] = irq;
157 tc->irq[2] = platform_get_irq(pdev, 2);
158 if (tc->irq[2] < 0)
159 tc->irq[2] = irq;
160
161 for (i = 0; i < 3; i++)
162 writel(ATMEL_TC_ALL_IRQ, tc->regs + ATMEL_TC_REG(i, IDR));
163
164 spin_lock(&tc_list_lock);
165 list_add_tail(&tc->node, &tc_list);
166 spin_unlock(&tc_list_lock);
167
168 platform_set_drvdata(pdev, tc);
169
170 return 0;
171}
172
173static void tc_shutdown(struct platform_device *pdev)
174{
175 int i;
176 struct atmel_tc *tc = platform_get_drvdata(pdev);
177
178 for (i = 0; i < 3; i++)
179 writel(ATMEL_TC_ALL_IRQ, tc->regs + ATMEL_TC_REG(i, IDR));
180}
181
182static struct platform_driver tc_driver = {
183 .driver = {
184 .name = "atmel_tcb",
185 .of_match_table = of_match_ptr(atmel_tcb_dt_ids),
186 },
187 .shutdown = tc_shutdown,
188};
189
190static int __init tc_init(void)
191{
192 return platform_driver_probe(&tc_driver, tc_probe);
193}
194arch_initcall(tc_init);
195