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2a341f5c DB |
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> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
2a341f5c DB |
10 | |
11 | /* Number of bytes to reserve for the iomem resource */ | |
12 | #define ATMEL_TC_IOMEM_SIZE 256 | |
13 | ||
14 | ||
15 | /* | |
16 | * This is a thin library to solve the problem of how to portably allocate | |
17 | * one of the TC blocks. For simplicity, it doesn't currently expect to | |
18 | * share individual timers between different drivers. | |
19 | */ | |
20 | ||
21 | #if defined(CONFIG_AVR32) | |
22 | /* AVR32 has these divide PBB */ | |
23 | const u8 atmel_tc_divisors[5] = { 0, 4, 8, 16, 32, }; | |
24 | EXPORT_SYMBOL(atmel_tc_divisors); | |
25 | ||
26 | #elif defined(CONFIG_ARCH_AT91) | |
27 | /* AT91 has these divide MCK */ | |
28 | const u8 atmel_tc_divisors[5] = { 2, 8, 32, 128, 0, }; | |
29 | EXPORT_SYMBOL(atmel_tc_divisors); | |
30 | ||
31 | #endif | |
32 | ||
33 | static DEFINE_SPINLOCK(tc_list_lock); | |
34 | static LIST_HEAD(tc_list); | |
35 | ||
36 | /** | |
37 | * atmel_tc_alloc - allocate a specified TC block | |
38 | * @block: which block to allocate | |
39 | * @name: name to be associated with the iomem resource | |
40 | * | |
41 | * Caller allocates a block. If it is available, a pointer to a | |
42 | * pre-initialized struct atmel_tc is returned. The caller can access | |
43 | * the registers directly through the "regs" field. | |
44 | */ | |
45 | struct atmel_tc *atmel_tc_alloc(unsigned block, const char *name) | |
46 | { | |
47 | struct atmel_tc *tc; | |
48 | struct platform_device *pdev = NULL; | |
49 | struct resource *r; | |
50 | ||
51 | spin_lock(&tc_list_lock); | |
52 | list_for_each_entry(tc, &tc_list, node) { | |
53 | if (tc->pdev->id == block) { | |
54 | pdev = tc->pdev; | |
55 | break; | |
56 | } | |
57 | } | |
58 | ||
59 | if (!pdev || tc->iomem) | |
60 | goto fail; | |
61 | ||
62 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
63 | r = request_mem_region(r->start, ATMEL_TC_IOMEM_SIZE, name); | |
64 | if (!r) | |
65 | goto fail; | |
66 | ||
67 | tc->regs = ioremap(r->start, ATMEL_TC_IOMEM_SIZE); | |
68 | if (!tc->regs) | |
69 | goto fail_ioremap; | |
70 | ||
71 | tc->iomem = r; | |
72 | ||
73 | out: | |
74 | spin_unlock(&tc_list_lock); | |
75 | return tc; | |
76 | ||
77 | fail_ioremap: | |
78 | release_resource(r); | |
79 | fail: | |
80 | tc = NULL; | |
81 | goto out; | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(atmel_tc_alloc); | |
84 | ||
85 | /** | |
86 | * atmel_tc_free - release a specified TC block | |
87 | * @tc: Timer/counter block that was returned by atmel_tc_alloc() | |
88 | * | |
89 | * This reverses the effect of atmel_tc_alloc(), unmapping the I/O | |
90 | * registers, invalidating the resource returned by that routine and | |
91 | * making the TC available to other drivers. | |
92 | */ | |
93 | void atmel_tc_free(struct atmel_tc *tc) | |
94 | { | |
95 | spin_lock(&tc_list_lock); | |
96 | if (tc->regs) { | |
97 | iounmap(tc->regs); | |
98 | release_resource(tc->iomem); | |
99 | tc->regs = NULL; | |
100 | tc->iomem = NULL; | |
101 | } | |
102 | spin_unlock(&tc_list_lock); | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(atmel_tc_free); | |
105 | ||
106 | static int __init tc_probe(struct platform_device *pdev) | |
107 | { | |
108 | struct atmel_tc *tc; | |
109 | struct clk *clk; | |
110 | int irq; | |
111 | ||
112 | if (!platform_get_resource(pdev, IORESOURCE_MEM, 0)) | |
113 | return -EINVAL; | |
114 | ||
115 | irq = platform_get_irq(pdev, 0); | |
116 | if (irq < 0) | |
117 | return -EINVAL; | |
118 | ||
119 | tc = kzalloc(sizeof(struct atmel_tc), GFP_KERNEL); | |
120 | if (!tc) | |
121 | return -ENOMEM; | |
122 | ||
123 | tc->pdev = pdev; | |
124 | ||
125 | clk = clk_get(&pdev->dev, "t0_clk"); | |
126 | if (IS_ERR(clk)) { | |
127 | kfree(tc); | |
128 | return -EINVAL; | |
129 | } | |
130 | ||
131 | tc->clk[0] = clk; | |
132 | tc->clk[1] = clk_get(&pdev->dev, "t1_clk"); | |
133 | if (IS_ERR(tc->clk[1])) | |
134 | tc->clk[1] = clk; | |
135 | tc->clk[2] = clk_get(&pdev->dev, "t2_clk"); | |
136 | if (IS_ERR(tc->clk[2])) | |
137 | tc->clk[2] = clk; | |
138 | ||
139 | tc->irq[0] = irq; | |
140 | tc->irq[1] = platform_get_irq(pdev, 1); | |
141 | if (tc->irq[1] < 0) | |
142 | tc->irq[1] = irq; | |
143 | tc->irq[2] = platform_get_irq(pdev, 2); | |
144 | if (tc->irq[2] < 0) | |
145 | tc->irq[2] = irq; | |
146 | ||
147 | spin_lock(&tc_list_lock); | |
148 | list_add_tail(&tc->node, &tc_list); | |
149 | spin_unlock(&tc_list_lock); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static struct platform_driver tc_driver = { | |
155 | .driver.name = "atmel_tcb", | |
156 | }; | |
157 | ||
158 | static int __init tc_init(void) | |
159 | { | |
160 | return platform_driver_probe(&tc_driver, tc_probe); | |
161 | } | |
162 | arch_initcall(tc_init); |