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clk: at91: add PMC main clock
[deliverable/linux.git] / drivers / clk / at91 / pmc.c
CommitLineData
0ad6125b
BB		 1/*
2 * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 */
10
11#include <linux/clk-provider.h>
12#include <linux/clkdev.h>
13#include <linux/clk/at91_pmc.h>
14#include <linux/of.h>
15#include <linux/of_address.h>
16#include <linux/io.h>
17#include <linux/interrupt.h>
18#include <linux/irq.h>
19#include <linux/irqchip/chained_irq.h>
20#include <linux/irqdomain.h>
21#include <linux/of_irq.h>
22
23#include <asm/proc-fns.h>
24
25#include "pmc.h"
26
27void __iomem *at91_pmc_base;
28EXPORT_SYMBOL_GPL(at91_pmc_base);
29
30void at91sam9_idle(void)
31{
32 at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
33 cpu_do_idle();
34}
35
36int of_at91_get_clk_range(struct device_node *np, const char *propname,
37 struct clk_range *range)
38{
39 u32 min, max;
40 int ret;
41
42 ret = of_property_read_u32_index(np, propname, 0, &min);
43 if (ret)
44 return ret;
45
46 ret = of_property_read_u32_index(np, propname, 1, &max);
47 if (ret)
48 return ret;
49
50 if (range) {
51 range->min = min;
52 range->max = max;
53 }
54
55 return 0;
56}
57EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
58
59static void pmc_irq_mask(struct irq_data *d)
60{
61 struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
62
63 pmc_write(pmc, AT91_PMC_IDR, 1 << d->hwirq);
64}
65
66static void pmc_irq_unmask(struct irq_data *d)
67{
68 struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
69
70 pmc_write(pmc, AT91_PMC_IER, 1 << d->hwirq);
71}
72
73static int pmc_irq_set_type(struct irq_data *d, unsigned type)
74{
75 if (type != IRQ_TYPE_LEVEL_HIGH) {
76 pr_warn("PMC: type not supported (support only IRQ_TYPE_LEVEL_HIGH type)\n");
77 return -EINVAL;
78 }
79
80 return 0;
81}
82
83static struct irq_chip pmc_irq = {
84 .name = "PMC",
85 .irq_disable = pmc_irq_mask,
86 .irq_mask = pmc_irq_mask,
87 .irq_unmask = pmc_irq_unmask,
88 .irq_set_type = pmc_irq_set_type,
89};
90
91static struct lock_class_key pmc_lock_class;
92
93static int pmc_irq_map(struct irq_domain *h, unsigned int virq,
94 irq_hw_number_t hw)
95{
96 struct at91_pmc *pmc = h->host_data;
97
98 irq_set_lockdep_class(virq, &pmc_lock_class);
99
100 irq_set_chip_and_handler(virq, &pmc_irq,
101 handle_level_irq);
102 set_irq_flags(virq, IRQF_VALID);
103 irq_set_chip_data(virq, pmc);
104
105 return 0;
106}
107
108static int pmc_irq_domain_xlate(struct irq_domain *d,
109 struct device_node *ctrlr,
110 const u32 *intspec, unsigned int intsize,
111 irq_hw_number_t *out_hwirq,
112 unsigned int *out_type)
113{
114 struct at91_pmc *pmc = d->host_data;
115 const struct at91_pmc_caps *caps = pmc->caps;
116
117 if (WARN_ON(intsize < 1))
118 return -EINVAL;
119
120 *out_hwirq = intspec[0];
121
122 if (!(caps->available_irqs & (1 << *out_hwirq)))
123 return -EINVAL;
124
125 *out_type = IRQ_TYPE_LEVEL_HIGH;
126
127 return 0;
128}
129
130static struct irq_domain_ops pmc_irq_ops = {
131 .map = pmc_irq_map,
132 .xlate = pmc_irq_domain_xlate,
133};
134
135static irqreturn_t pmc_irq_handler(int irq, void *data)
136{
137 struct at91_pmc *pmc = (struct at91_pmc *)data;
138 unsigned long sr;
139 int n;
140
141 sr = pmc_read(pmc, AT91_PMC_SR) & pmc_read(pmc, AT91_PMC_IMR);
142 if (!sr)
143 return IRQ_NONE;
144
145 for_each_set_bit(n, &sr, BITS_PER_LONG)
146 generic_handle_irq(irq_find_mapping(pmc->irqdomain, n));
147
148 return IRQ_HANDLED;
149}
150
151static const struct at91_pmc_caps at91rm9200_caps = {
152 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
153 AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
154 AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
155 AT91_PMC_PCK3RDY,
156};
157
158static const struct at91_pmc_caps at91sam9260_caps = {
159 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
160 AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
161 AT91_PMC_PCK1RDY,
162};
163
164static const struct at91_pmc_caps at91sam9g45_caps = {
165 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
166 AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
167 AT91_PMC_PCK1RDY,
168};
169
170static const struct at91_pmc_caps at91sam9n12_caps = {
171 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
172 AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
173 AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
174 AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
175};
176
177static const struct at91_pmc_caps at91sam9x5_caps = {
178 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
179 AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
180 AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
181 AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
182};
183
184static const struct at91_pmc_caps sama5d3_caps = {
185 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
186 AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
187 AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
188 AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS |
189 AT91_PMC_CFDEV,
190};
191
192static struct at91_pmc *__init at91_pmc_init(struct device_node *np,
193 void __iomem *regbase, int virq,
194 const struct at91_pmc_caps *caps)
195{
196 struct at91_pmc *pmc;
197
198 if (!regbase || !virq || !caps)
199 return NULL;
200
201 at91_pmc_base = regbase;
202
203 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
204 if (!pmc)
205 return NULL;
206
207 spin_lock_init(&pmc->lock);
208 pmc->regbase = regbase;
209 pmc->virq = virq;
210 pmc->caps = caps;
211
212 pmc->irqdomain = irq_domain_add_linear(np, 32, &pmc_irq_ops, pmc);
213
214 if (!pmc->irqdomain)
215 goto out_free_pmc;
216
217 pmc_write(pmc, AT91_PMC_IDR, 0xffffffff);
218 if (request_irq(pmc->virq, pmc_irq_handler, IRQF_SHARED, "pmc", pmc))
219 goto out_remove_irqdomain;
220
221 return pmc;
222
223out_remove_irqdomain:
224 irq_domain_remove(pmc->irqdomain);
225out_free_pmc:
226 kfree(pmc);
227
228 return NULL;
229}
230
231static const struct of_device_id pmc_clk_ids[] __initdata = {
38d34c31
BB		 232 /* Main clock */
233 {
234 .compatible = "atmel,at91rm9200-clk-main",
235 .data = of_at91rm9200_clk_main_setup,
236 },
0ad6125b
BB		 237 { /*sentinel*/ }
238};
239
240static void __init of_at91_pmc_setup(struct device_node *np,
241 const struct at91_pmc_caps *caps)
242{
243 struct at91_pmc *pmc;
244 struct device_node *childnp;
245 void (*clk_setup)(struct device_node *, struct at91_pmc *);
246 const struct of_device_id *clk_id;
247 void __iomem *regbase = of_iomap(np, 0);
248 int virq;
249
250 if (!regbase)
251 return;
252
253 virq = irq_of_parse_and_map(np, 0);
254 if (!virq)
255 return;
256
257 pmc = at91_pmc_init(np, regbase, virq, caps);
258 if (!pmc)
259 return;
260 for_each_child_of_node(np, childnp) {
261 clk_id = of_match_node(pmc_clk_ids, childnp);
262 if (!clk_id)
263 continue;
264 clk_setup = clk_id->data;
265 clk_setup(childnp, pmc);
266 }
267}
268
269static void __init of_at91rm9200_pmc_setup(struct device_node *np)
270{
271 of_at91_pmc_setup(np, &at91rm9200_caps);
272}
273CLK_OF_DECLARE(at91rm9200_clk_pmc, "atmel,at91rm9200-pmc",
274 of_at91rm9200_pmc_setup);
275
276static void __init of_at91sam9260_pmc_setup(struct device_node *np)
277{
278 of_at91_pmc_setup(np, &at91sam9260_caps);
279}
280CLK_OF_DECLARE(at91sam9260_clk_pmc, "atmel,at91sam9260-pmc",
281 of_at91sam9260_pmc_setup);
282
283static void __init of_at91sam9g45_pmc_setup(struct device_node *np)
284{
285 of_at91_pmc_setup(np, &at91sam9g45_caps);
286}
287CLK_OF_DECLARE(at91sam9g45_clk_pmc, "atmel,at91sam9g45-pmc",
288 of_at91sam9g45_pmc_setup);
289
290static void __init of_at91sam9n12_pmc_setup(struct device_node *np)
291{
292 of_at91_pmc_setup(np, &at91sam9n12_caps);
293}
294CLK_OF_DECLARE(at91sam9n12_clk_pmc, "atmel,at91sam9n12-pmc",
295 of_at91sam9n12_pmc_setup);
296
297static void __init of_at91sam9x5_pmc_setup(struct device_node *np)
298{
299 of_at91_pmc_setup(np, &at91sam9x5_caps);
300}
301CLK_OF_DECLARE(at91sam9x5_clk_pmc, "atmel,at91sam9x5-pmc",
302 of_at91sam9x5_pmc_setup);
303
304static void __init of_sama5d3_pmc_setup(struct device_node *np)
305{
306 of_at91_pmc_setup(np, &sama5d3_caps);
307}
308CLK_OF_DECLARE(sama5d3_clk_pmc, "atmel,sama5d3-pmc",
309 of_sama5d3_pmc_setup);
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