Commit | Line | Data |
---|---|---|
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> | |
3a61a5da | 9 | #include <linux/module.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
7a32129a | 11 | #include <linux/export.h> |
3a61a5da | 12 | #include <linux/of.h> |
2a341f5c | 13 | |
2a341f5c DB |
14 | /* |
15 | * This is a thin library to solve the problem of how to portably allocate | |
16 | * one of the TC blocks. For simplicity, it doesn't currently expect to | |
17 | * share individual timers between different drivers. | |
18 | */ | |
19 | ||
20 | #if defined(CONFIG_AVR32) | |
21 | /* AVR32 has these divide PBB */ | |
22 | const u8 atmel_tc_divisors[5] = { 0, 4, 8, 16, 32, }; | |
23 | EXPORT_SYMBOL(atmel_tc_divisors); | |
24 | ||
25 | #elif defined(CONFIG_ARCH_AT91) | |
26 | /* AT91 has these divide MCK */ | |
27 | const u8 atmel_tc_divisors[5] = { 2, 8, 32, 128, 0, }; | |
28 | EXPORT_SYMBOL(atmel_tc_divisors); | |
29 | ||
30 | #endif | |
31 | ||
32 | static DEFINE_SPINLOCK(tc_list_lock); | |
33 | static LIST_HEAD(tc_list); | |
34 | ||
35 | /** | |
36 | * atmel_tc_alloc - allocate a specified TC block | |
37 | * @block: which block to allocate | |
38 | * @name: name to be associated with the iomem resource | |
39 | * | |
40 | * Caller allocates a block. If it is available, a pointer to a | |
41 | * pre-initialized struct atmel_tc is returned. The caller can access | |
42 | * the registers directly through the "regs" field. | |
43 | */ | |
44 | struct atmel_tc *atmel_tc_alloc(unsigned block, const char *name) | |
45 | { | |
46 | struct atmel_tc *tc; | |
47 | struct platform_device *pdev = NULL; | |
48 | struct resource *r; | |
29831297 | 49 | size_t size; |
2a341f5c DB |
50 | |
51 | spin_lock(&tc_list_lock); | |
52 | list_for_each_entry(tc, &tc_list, node) { | |
3a61a5da NF |
53 | if (tc->pdev->dev.of_node) { |
54 | if (of_alias_get_id(tc->pdev->dev.of_node, "tcb") | |
55 | == block) { | |
56 | pdev = tc->pdev; | |
57 | break; | |
58 | } | |
59 | } else if (tc->pdev->id == block) { | |
2a341f5c DB |
60 | pdev = tc->pdev; |
61 | break; | |
62 | } | |
63 | } | |
64 | ||
65 | if (!pdev || tc->iomem) | |
66 | goto fail; | |
67 | ||
68 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
2a341f5c DB |
69 | if (!r) |
70 | goto fail; | |
71 | ||
29831297 NF |
72 | size = resource_size(r); |
73 | r = request_mem_region(r->start, size, name); | |
74 | if (!r) | |
75 | goto fail; | |
76 | ||
77 | tc->regs = ioremap(r->start, size); | |
2a341f5c DB |
78 | if (!tc->regs) |
79 | goto fail_ioremap; | |
80 | ||
81 | tc->iomem = r; | |
82 | ||
83 | out: | |
84 | spin_unlock(&tc_list_lock); | |
85 | return tc; | |
86 | ||
87 | fail_ioremap: | |
29831297 | 88 | release_mem_region(r->start, size); |
2a341f5c DB |
89 | fail: |
90 | tc = NULL; | |
91 | goto out; | |
92 | } | |
93 | EXPORT_SYMBOL_GPL(atmel_tc_alloc); | |
94 | ||
95 | /** | |
96 | * atmel_tc_free - release a specified TC block | |
97 | * @tc: Timer/counter block that was returned by atmel_tc_alloc() | |
98 | * | |
99 | * This reverses the effect of atmel_tc_alloc(), unmapping the I/O | |
100 | * registers, invalidating the resource returned by that routine and | |
101 | * making the TC available to other drivers. | |
102 | */ | |
103 | void atmel_tc_free(struct atmel_tc *tc) | |
104 | { | |
105 | spin_lock(&tc_list_lock); | |
106 | if (tc->regs) { | |
107 | iounmap(tc->regs); | |
29831297 | 108 | release_mem_region(tc->iomem->start, resource_size(tc->iomem)); |
2a341f5c DB |
109 | tc->regs = NULL; |
110 | tc->iomem = NULL; | |
111 | } | |
112 | spin_unlock(&tc_list_lock); | |
113 | } | |
114 | EXPORT_SYMBOL_GPL(atmel_tc_free); | |
115 | ||
3a61a5da | 116 | #if defined(CONFIG_OF) |
8e315a7b NF |
117 | static struct atmel_tcb_config tcb_rm9200_config = { |
118 | .counter_width = 16, | |
119 | }; | |
120 | ||
121 | static struct atmel_tcb_config tcb_sam9x5_config = { | |
122 | .counter_width = 32, | |
123 | }; | |
124 | ||
3a61a5da NF |
125 | static const struct of_device_id atmel_tcb_dt_ids[] = { |
126 | { | |
127 | .compatible = "atmel,at91rm9200-tcb", | |
8e315a7b NF |
128 | .data = &tcb_rm9200_config, |
129 | }, { | |
130 | .compatible = "atmel,at91sam9x5-tcb", | |
131 | .data = &tcb_sam9x5_config, | |
3a61a5da NF |
132 | }, { |
133 | /* sentinel */ | |
134 | } | |
135 | }; | |
136 | ||
137 | MODULE_DEVICE_TABLE(of, atmel_tcb_dt_ids); | |
138 | #endif | |
139 | ||
2a341f5c DB |
140 | static int __init tc_probe(struct platform_device *pdev) |
141 | { | |
142 | struct atmel_tc *tc; | |
143 | struct clk *clk; | |
144 | int irq; | |
145 | ||
146 | if (!platform_get_resource(pdev, IORESOURCE_MEM, 0)) | |
147 | return -EINVAL; | |
148 | ||
149 | irq = platform_get_irq(pdev, 0); | |
150 | if (irq < 0) | |
151 | return -EINVAL; | |
152 | ||
153 | tc = kzalloc(sizeof(struct atmel_tc), GFP_KERNEL); | |
154 | if (!tc) | |
155 | return -ENOMEM; | |
156 | ||
157 | tc->pdev = pdev; | |
158 | ||
159 | clk = clk_get(&pdev->dev, "t0_clk"); | |
160 | if (IS_ERR(clk)) { | |
161 | kfree(tc); | |
162 | return -EINVAL; | |
163 | } | |
164 | ||
8e315a7b NF |
165 | /* Now take SoC information if available */ |
166 | if (pdev->dev.of_node) { | |
167 | const struct of_device_id *match; | |
168 | match = of_match_node(atmel_tcb_dt_ids, pdev->dev.of_node); | |
169 | if (match) | |
170 | tc->tcb_config = match->data; | |
171 | } | |
172 | ||
2a341f5c DB |
173 | tc->clk[0] = clk; |
174 | tc->clk[1] = clk_get(&pdev->dev, "t1_clk"); | |
175 | if (IS_ERR(tc->clk[1])) | |
176 | tc->clk[1] = clk; | |
177 | tc->clk[2] = clk_get(&pdev->dev, "t2_clk"); | |
178 | if (IS_ERR(tc->clk[2])) | |
179 | tc->clk[2] = clk; | |
180 | ||
181 | tc->irq[0] = irq; | |
182 | tc->irq[1] = platform_get_irq(pdev, 1); | |
183 | if (tc->irq[1] < 0) | |
184 | tc->irq[1] = irq; | |
185 | tc->irq[2] = platform_get_irq(pdev, 2); | |
186 | if (tc->irq[2] < 0) | |
187 | tc->irq[2] = irq; | |
188 | ||
189 | spin_lock(&tc_list_lock); | |
190 | list_add_tail(&tc->node, &tc_list); | |
191 | spin_unlock(&tc_list_lock); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static struct platform_driver tc_driver = { | |
3a61a5da NF |
197 | .driver = { |
198 | .name = "atmel_tcb", | |
199 | .of_match_table = of_match_ptr(atmel_tcb_dt_ids), | |
200 | }, | |
2a341f5c DB |
201 | }; |
202 | ||
203 | static int __init tc_init(void) | |
204 | { | |
205 | return platform_driver_probe(&tc_driver, tc_probe); | |
206 | } | |
207 | arch_initcall(tc_init); |