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9#include <linux/kernel.h>
10#include <linux/err.h>
11#include <linux/module.h>
12#include <linux/spinlock.h>
13#include <linux/interrupt.h>
14#include <linux/clk.h>
15#include <bcm63xx_cpu.h>
16#include <bcm63xx_io.h>
17#include <bcm63xx_timer.h>
18#include <bcm63xx_regs.h>
19
20static DEFINE_SPINLOCK(timer_reg_lock);
21static DEFINE_SPINLOCK(timer_data_lock);
22static struct clk *periph_clk;
23
24static struct timer_data {
25 void (*cb)(void *);
26 void *data;
27} timer_data[BCM63XX_TIMER_COUNT];
28
29static irqreturn_t timer_interrupt(int irq, void *dev_id)
30{
31 u32 stat;
32 int i;
33
34 spin_lock(&timer_reg_lock);
35 stat = bcm_timer_readl(TIMER_IRQSTAT_REG);
36 bcm_timer_writel(stat, TIMER_IRQSTAT_REG);
37 spin_unlock(&timer_reg_lock);
38
39 for (i = 0; i < BCM63XX_TIMER_COUNT; i++) {
40 if (!(stat & TIMER_IRQSTAT_TIMER_CAUSE(i)))
41 continue;
42
43 spin_lock(&timer_data_lock);
44 if (!timer_data[i].cb) {
45 spin_unlock(&timer_data_lock);
46 continue;
47 }
48
49 timer_data[i].cb(timer_data[i].data);
50 spin_unlock(&timer_data_lock);
51 }
52
53 return IRQ_HANDLED;
54}
55
56int bcm63xx_timer_enable(int id)
57{
58 u32 reg;
59 unsigned long flags;
60
61 if (id >= BCM63XX_TIMER_COUNT)
62 return -EINVAL;
63
64 spin_lock_irqsave(&timer_reg_lock, flags);
65
66 reg = bcm_timer_readl(TIMER_CTLx_REG(id));
67 reg |= TIMER_CTL_ENABLE_MASK;
68 bcm_timer_writel(reg, TIMER_CTLx_REG(id));
69
70 reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
71 reg |= TIMER_IRQSTAT_TIMER_IR_EN(id);
72 bcm_timer_writel(reg, TIMER_IRQSTAT_REG);
73
74 spin_unlock_irqrestore(&timer_reg_lock, flags);
75 return 0;
76}
77
78EXPORT_SYMBOL(bcm63xx_timer_enable);
79
80int bcm63xx_timer_disable(int id)
81{
82 u32 reg;
83 unsigned long flags;
84
85 if (id >= BCM63XX_TIMER_COUNT)
86 return -EINVAL;
87
88 spin_lock_irqsave(&timer_reg_lock, flags);
89
90 reg = bcm_timer_readl(TIMER_CTLx_REG(id));
91 reg &= ~TIMER_CTL_ENABLE_MASK;
92 bcm_timer_writel(reg, TIMER_CTLx_REG(id));
93
94 reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
95 reg &= ~TIMER_IRQSTAT_TIMER_IR_EN(id);
96 bcm_timer_writel(reg, TIMER_IRQSTAT_REG);
97
98 spin_unlock_irqrestore(&timer_reg_lock, flags);
99 return 0;
100}
101
102EXPORT_SYMBOL(bcm63xx_timer_disable);
103
104int bcm63xx_timer_register(int id, void (*callback)(void *data), void *data)
105{
106 unsigned long flags;
107 int ret;
108
109 if (id >= BCM63XX_TIMER_COUNT || !callback)
110 return -EINVAL;
111
112 ret = 0;
113 spin_lock_irqsave(&timer_data_lock, flags);
114 if (timer_data[id].cb) {
115 ret = -EBUSY;
116 goto out;
117 }
118
119 timer_data[id].cb = callback;
120 timer_data[id].data = data;
121
122out:
123 spin_unlock_irqrestore(&timer_data_lock, flags);
124 return ret;
125}
126
127EXPORT_SYMBOL(bcm63xx_timer_register);
128
129void bcm63xx_timer_unregister(int id)
130{
131 unsigned long flags;
132
133 if (id >= BCM63XX_TIMER_COUNT)
134 return;
135
136 spin_lock_irqsave(&timer_data_lock, flags);
137 timer_data[id].cb = NULL;
138 spin_unlock_irqrestore(&timer_data_lock, flags);
139}
140
141EXPORT_SYMBOL(bcm63xx_timer_unregister);
142
143unsigned int bcm63xx_timer_countdown(unsigned int countdown_us)
144{
145 return (clk_get_rate(periph_clk) / (1000 * 1000)) * countdown_us;
146}
147
148EXPORT_SYMBOL(bcm63xx_timer_countdown);
149
150int bcm63xx_timer_set(int id, int monotonic, unsigned int countdown_us)
151{
152 u32 reg, countdown;
153 unsigned long flags;
154
155 if (id >= BCM63XX_TIMER_COUNT)
156 return -EINVAL;
157
158 countdown = bcm63xx_timer_countdown(countdown_us);
159 if (countdown & ~TIMER_CTL_COUNTDOWN_MASK)
160 return -EINVAL;
161
162 spin_lock_irqsave(&timer_reg_lock, flags);
163 reg = bcm_timer_readl(TIMER_CTLx_REG(id));
164
165 if (monotonic)
166 reg &= ~TIMER_CTL_MONOTONIC_MASK;
167 else
168 reg |= TIMER_CTL_MONOTONIC_MASK;
169
170 reg &= ~TIMER_CTL_COUNTDOWN_MASK;
171 reg |= countdown;
172 bcm_timer_writel(reg, TIMER_CTLx_REG(id));
173
174 spin_unlock_irqrestore(&timer_reg_lock, flags);
175 return 0;
176}
177
178EXPORT_SYMBOL(bcm63xx_timer_set);
179
180int bcm63xx_timer_init(void)
181{
182 int ret, irq;
183 u32 reg;
184
185 reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
186 reg &= ~TIMER_IRQSTAT_TIMER0_IR_EN;
187 reg &= ~TIMER_IRQSTAT_TIMER1_IR_EN;
188 reg &= ~TIMER_IRQSTAT_TIMER2_IR_EN;
189 bcm_timer_writel(reg, TIMER_IRQSTAT_REG);
190
191 periph_clk = clk_get(NULL, "periph");
192 if (IS_ERR(periph_clk))
193 return -ENODEV;
194
195 irq = bcm63xx_get_irq_number(IRQ_TIMER);
196 ret = request_irq(irq, timer_interrupt, 0, "bcm63xx_timer", NULL);
197 if (ret) {
198 printk(KERN_ERR "bcm63xx_timer: failed to register irq\n");
199 return ret;
200 }
201
202 return 0;
203}
204
205arch_initcall(bcm63xx_timer_init);
206
