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