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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2a341f5c DB |
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> |
c2c9136b | 13 | #include <soc/at91/atmel_tcb.h> |
2a341f5c | 14 | |
2a341f5c DB |
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 | |
2a341f5c DB |
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 | */ | |
4930d247 | 44 | struct atmel_tc *atmel_tc_alloc(unsigned block) |
2a341f5c DB |
45 | { |
46 | struct atmel_tc *tc; | |
47 | struct platform_device *pdev = NULL; | |
2a341f5c DB |
48 | |
49 | spin_lock(&tc_list_lock); | |
50 | list_for_each_entry(tc, &tc_list, node) { | |
4930d247 GP |
51 | if (tc->allocated) |
52 | continue; | |
53 | ||
54 | if ((tc->pdev->dev.of_node && tc->id == block) || | |
55 | (tc->pdev->id == block)) { | |
2a341f5c | 56 | pdev = tc->pdev; |
4930d247 | 57 | tc->allocated = true; |
2a341f5c DB |
58 | break; |
59 | } | |
60 | } | |
2a341f5c | 61 | spin_unlock(&tc_list_lock); |
2a341f5c | 62 | |
4930d247 | 63 | return pdev ? tc : NULL; |
2a341f5c DB |
64 | } |
65 | EXPORT_SYMBOL_GPL(atmel_tc_alloc); | |
66 | ||
67 | /** | |
68 | * atmel_tc_free - release a specified TC block | |
69 | * @tc: Timer/counter block that was returned by atmel_tc_alloc() | |
70 | * | |
4930d247 GP |
71 | * This reverses the effect of atmel_tc_alloc(), invalidating the resource |
72 | * returned by that routine and making the TC available to other drivers. | |
2a341f5c DB |
73 | */ |
74 | void atmel_tc_free(struct atmel_tc *tc) | |
75 | { | |
76 | spin_lock(&tc_list_lock); | |
4930d247 GP |
77 | if (tc->allocated) |
78 | tc->allocated = false; | |
2a341f5c DB |
79 | spin_unlock(&tc_list_lock); |
80 | } | |
81 | EXPORT_SYMBOL_GPL(atmel_tc_free); | |
82 | ||
3a61a5da | 83 | #if defined(CONFIG_OF) |
8e315a7b NF |
84 | static struct atmel_tcb_config tcb_rm9200_config = { |
85 | .counter_width = 16, | |
86 | }; | |
87 | ||
88 | static struct atmel_tcb_config tcb_sam9x5_config = { | |
89 | .counter_width = 32, | |
90 | }; | |
91 | ||
3a61a5da NF |
92 | static const struct of_device_id atmel_tcb_dt_ids[] = { |
93 | { | |
94 | .compatible = "atmel,at91rm9200-tcb", | |
8e315a7b NF |
95 | .data = &tcb_rm9200_config, |
96 | }, { | |
97 | .compatible = "atmel,at91sam9x5-tcb", | |
98 | .data = &tcb_sam9x5_config, | |
3a61a5da NF |
99 | }, { |
100 | /* sentinel */ | |
101 | } | |
102 | }; | |
103 | ||
104 | MODULE_DEVICE_TABLE(of, atmel_tcb_dt_ids); | |
105 | #endif | |
106 | ||
2a341f5c DB |
107 | static int __init tc_probe(struct platform_device *pdev) |
108 | { | |
109 | struct atmel_tc *tc; | |
110 | struct clk *clk; | |
111 | int irq; | |
84f46237 | 112 | unsigned int i; |
2a341f5c | 113 | |
8c937406 AB |
114 | if (of_get_child_count(pdev->dev.of_node)) |
115 | return -EBUSY; | |
116 | ||
2a341f5c DB |
117 | irq = platform_get_irq(pdev, 0); |
118 | if (irq < 0) | |
119 | return -EINVAL; | |
120 | ||
8495497f | 121 | tc = devm_kzalloc(&pdev->dev, sizeof(struct atmel_tc), GFP_KERNEL); |
2a341f5c DB |
122 | if (!tc) |
123 | return -ENOMEM; | |
124 | ||
125 | tc->pdev = pdev; | |
126 | ||
8495497f GP |
127 | clk = devm_clk_get(&pdev->dev, "t0_clk"); |
128 | if (IS_ERR(clk)) | |
129 | return PTR_ERR(clk); | |
2a341f5c | 130 | |
7d8d05d1 BB |
131 | tc->slow_clk = devm_clk_get(&pdev->dev, "slow_clk"); |
132 | if (IS_ERR(tc->slow_clk)) | |
133 | return PTR_ERR(tc->slow_clk); | |
134 | ||
ad90ff69 | 135 | tc->regs = devm_platform_ioremap_resource(pdev, 0); |
4930d247 GP |
136 | if (IS_ERR(tc->regs)) |
137 | return PTR_ERR(tc->regs); | |
138 | ||
8e315a7b NF |
139 | /* Now take SoC information if available */ |
140 | if (pdev->dev.of_node) { | |
141 | const struct of_device_id *match; | |
142 | match = of_match_node(atmel_tcb_dt_ids, pdev->dev.of_node); | |
143 | if (match) | |
144 | tc->tcb_config = match->data; | |
4930d247 GP |
145 | |
146 | tc->id = of_alias_get_id(tc->pdev->dev.of_node, "tcb"); | |
147 | } else { | |
148 | tc->id = pdev->id; | |
8e315a7b NF |
149 | } |
150 | ||
2a341f5c | 151 | tc->clk[0] = clk; |
8495497f | 152 | tc->clk[1] = devm_clk_get(&pdev->dev, "t1_clk"); |
2a341f5c DB |
153 | if (IS_ERR(tc->clk[1])) |
154 | tc->clk[1] = clk; | |
8495497f | 155 | tc->clk[2] = devm_clk_get(&pdev->dev, "t2_clk"); |
2a341f5c DB |
156 | if (IS_ERR(tc->clk[2])) |
157 | tc->clk[2] = clk; | |
158 | ||
159 | tc->irq[0] = irq; | |
160 | tc->irq[1] = platform_get_irq(pdev, 1); | |
161 | if (tc->irq[1] < 0) | |
162 | tc->irq[1] = irq; | |
163 | tc->irq[2] = platform_get_irq(pdev, 2); | |
164 | if (tc->irq[2] < 0) | |
165 | tc->irq[2] = irq; | |
166 | ||
84f46237 GP |
167 | for (i = 0; i < 3; i++) |
168 | writel(ATMEL_TC_ALL_IRQ, tc->regs + ATMEL_TC_REG(i, IDR)); | |
169 | ||
2a341f5c DB |
170 | spin_lock(&tc_list_lock); |
171 | list_add_tail(&tc->node, &tc_list); | |
172 | spin_unlock(&tc_list_lock); | |
173 | ||
84f46237 GP |
174 | platform_set_drvdata(pdev, tc); |
175 | ||
2a341f5c DB |
176 | return 0; |
177 | } | |
178 | ||
84f46237 GP |
179 | static void tc_shutdown(struct platform_device *pdev) |
180 | { | |
181 | int i; | |
182 | struct atmel_tc *tc = platform_get_drvdata(pdev); | |
183 | ||
184 | for (i = 0; i < 3; i++) | |
185 | writel(ATMEL_TC_ALL_IRQ, tc->regs + ATMEL_TC_REG(i, IDR)); | |
186 | } | |
187 | ||
2a341f5c | 188 | static struct platform_driver tc_driver = { |
3a61a5da NF |
189 | .driver = { |
190 | .name = "atmel_tcb", | |
191 | .of_match_table = of_match_ptr(atmel_tcb_dt_ids), | |
192 | }, | |
84f46237 | 193 | .shutdown = tc_shutdown, |
2a341f5c DB |
194 | }; |
195 | ||
196 | static int __init tc_init(void) | |
197 | { | |
198 | return platform_driver_probe(&tc_driver, tc_probe); | |
199 | } | |
200 | arch_initcall(tc_init); |