misc: fix ti-st build issues
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / misc / atmel_tclib.c
bloba844810b50f68a6a88e12ed7a427862a044efc48
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>
11 /* Number of bytes to reserve for the iomem resource */
12 #define ATMEL_TC_IOMEM_SIZE 256
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.
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);
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);
31 #endif
33 static DEFINE_SPINLOCK(tc_list_lock);
34 static LIST_HEAD(tc_list);
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
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.
45 struct atmel_tc *atmel_tc_alloc(unsigned block, const char *name)
47 struct atmel_tc *tc;
48 struct platform_device *pdev = NULL;
49 struct resource *r;
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;
59 if (!pdev || tc->iomem)
60 goto fail;
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;
67 tc->regs = ioremap(r->start, ATMEL_TC_IOMEM_SIZE);
68 if (!tc->regs)
69 goto fail_ioremap;
71 tc->iomem = r;
73 out:
74 spin_unlock(&tc_list_lock);
75 return tc;
77 fail_ioremap:
78 release_mem_region(r->start, ATMEL_TC_IOMEM_SIZE);
79 fail:
80 tc = NULL;
81 goto out;
83 EXPORT_SYMBOL_GPL(atmel_tc_alloc);
85 /**
86 * atmel_tc_free - release a specified TC block
87 * @tc: Timer/counter block that was returned by atmel_tc_alloc()
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.
93 void atmel_tc_free(struct atmel_tc *tc)
95 spin_lock(&tc_list_lock);
96 if (tc->regs) {
97 iounmap(tc->regs);
98 release_mem_region(tc->iomem->start, ATMEL_TC_IOMEM_SIZE);
99 tc->regs = NULL;
100 tc->iomem = NULL;
102 spin_unlock(&tc_list_lock);
104 EXPORT_SYMBOL_GPL(atmel_tc_free);
106 static int __init tc_probe(struct platform_device *pdev)
108 struct atmel_tc *tc;
109 struct clk *clk;
110 int irq;
112 if (!platform_get_resource(pdev, IORESOURCE_MEM, 0))
113 return -EINVAL;
115 irq = platform_get_irq(pdev, 0);
116 if (irq < 0)
117 return -EINVAL;
119 tc = kzalloc(sizeof(struct atmel_tc), GFP_KERNEL);
120 if (!tc)
121 return -ENOMEM;
123 tc->pdev = pdev;
125 clk = clk_get(&pdev->dev, "t0_clk");
126 if (IS_ERR(clk)) {
127 kfree(tc);
128 return -EINVAL;
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;
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;
147 spin_lock(&tc_list_lock);
148 list_add_tail(&tc->node, &tc_list);
149 spin_unlock(&tc_list_lock);
151 return 0;
154 static struct platform_driver tc_driver = {
155 .driver.name = "atmel_tcb",
158 static int __init tc_init(void)
160 return platform_driver_probe(&tc_driver, tc_probe);
162 arch_initcall(tc_init);