include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-2.6.git] / drivers / misc / atmel_tclib.c
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/slab.h>
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);