diff options
Diffstat (limited to 'arch/sh/kernel/timers/timer-tmu.c')
-rw-r--r-- | arch/sh/kernel/timers/timer-tmu.c | 297 |
1 files changed, 0 insertions, 297 deletions
diff --git a/arch/sh/kernel/timers/timer-tmu.c b/arch/sh/kernel/timers/timer-tmu.c deleted file mode 100644 index fe8d8930ccb6..000000000000 --- a/arch/sh/kernel/timers/timer-tmu.c +++ /dev/null | |||
@@ -1,297 +0,0 @@ | |||
1 | /* | ||
2 | * arch/sh/kernel/timers/timer-tmu.c - TMU Timer Support | ||
3 | * | ||
4 | * Copyright (C) 2005 - 2007 Paul Mundt | ||
5 | * | ||
6 | * TMU handling code hacked out of arch/sh/kernel/time.c | ||
7 | * | ||
8 | * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka | ||
9 | * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> | ||
10 | * Copyright (C) 2002, 2003, 2004 Paul Mundt | ||
11 | * Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org> | ||
12 | * | ||
13 | * This file is subject to the terms and conditions of the GNU General Public | ||
14 | * License. See the file "COPYING" in the main directory of this archive | ||
15 | * for more details. | ||
16 | */ | ||
17 | #include <linux/init.h> | ||
18 | #include <linux/kernel.h> | ||
19 | #include <linux/interrupt.h> | ||
20 | #include <linux/seqlock.h> | ||
21 | #include <linux/clockchips.h> | ||
22 | #include <asm/timer.h> | ||
23 | #include <asm/rtc.h> | ||
24 | #include <asm/io.h> | ||
25 | #include <asm/irq.h> | ||
26 | #include <asm/clock.h> | ||
27 | |||
28 | #define TMU_TOCR_INIT 0x00 | ||
29 | #define TMU_TCR_INIT 0x0020 | ||
30 | |||
31 | #define TMU0 (0) | ||
32 | #define TMU1 (1) | ||
33 | |||
34 | static inline void _tmu_start(int tmu_num) | ||
35 | { | ||
36 | ctrl_outb(ctrl_inb(TMU_012_TSTR) | (0x1<<tmu_num), TMU_012_TSTR); | ||
37 | } | ||
38 | |||
39 | static inline void _tmu_set_irq(int tmu_num, int enabled) | ||
40 | { | ||
41 | register unsigned long tmu_tcr = TMU0_TCR + (0xc*tmu_num); | ||
42 | ctrl_outw( (enabled ? ctrl_inw(tmu_tcr) | (1<<5) : ctrl_inw(tmu_tcr) & ~(1<<5)), tmu_tcr); | ||
43 | } | ||
44 | |||
45 | static inline void _tmu_stop(int tmu_num) | ||
46 | { | ||
47 | ctrl_outb(ctrl_inb(TMU_012_TSTR) & ~(0x1<<tmu_num), TMU_012_TSTR); | ||
48 | } | ||
49 | |||
50 | static inline void _tmu_clear_status(int tmu_num) | ||
51 | { | ||
52 | register unsigned long tmu_tcr = TMU0_TCR + (0xc*tmu_num); | ||
53 | /* Clear UNF bit */ | ||
54 | ctrl_outw(ctrl_inw(tmu_tcr) & ~0x100, tmu_tcr); | ||
55 | } | ||
56 | |||
57 | static inline unsigned long _tmu_read(int tmu_num) | ||
58 | { | ||
59 | return ctrl_inl(TMU0_TCNT+0xC*tmu_num); | ||
60 | } | ||
61 | |||
62 | static int tmu_timer_start(void) | ||
63 | { | ||
64 | _tmu_start(TMU0); | ||
65 | _tmu_start(TMU1); | ||
66 | _tmu_set_irq(TMU0,1); | ||
67 | return 0; | ||
68 | } | ||
69 | |||
70 | static int tmu_timer_stop(void) | ||
71 | { | ||
72 | _tmu_stop(TMU0); | ||
73 | _tmu_stop(TMU1); | ||
74 | _tmu_clear_status(TMU0); | ||
75 | return 0; | ||
76 | } | ||
77 | |||
78 | /* | ||
79 | * also when the module_clk is scaled the TMU1 | ||
80 | * will show the same frequency | ||
81 | */ | ||
82 | static int tmus_are_scaled; | ||
83 | |||
84 | static cycle_t tmu_timer_read(struct clocksource *cs) | ||
85 | { | ||
86 | return ((cycle_t)(~_tmu_read(TMU1)))<<tmus_are_scaled; | ||
87 | } | ||
88 | |||
89 | |||
90 | static unsigned long tmu_latest_interval[3]; | ||
91 | static void tmu_timer_set_interval(int tmu_num, unsigned long interval, unsigned int reload) | ||
92 | { | ||
93 | unsigned long tmu_tcnt = TMU0_TCNT + tmu_num*0xC; | ||
94 | unsigned long tmu_tcor = TMU0_TCOR + tmu_num*0xC; | ||
95 | |||
96 | _tmu_stop(tmu_num); | ||
97 | |||
98 | ctrl_outl(interval, tmu_tcnt); | ||
99 | tmu_latest_interval[tmu_num] = interval; | ||
100 | |||
101 | /* | ||
102 | * TCNT reloads from TCOR on underflow, clear it if we don't | ||
103 | * intend to auto-reload | ||
104 | */ | ||
105 | ctrl_outl( reload ? interval : 0 , tmu_tcor); | ||
106 | |||
107 | _tmu_start(tmu_num); | ||
108 | } | ||
109 | |||
110 | static int tmu_set_next_event(unsigned long cycles, | ||
111 | struct clock_event_device *evt) | ||
112 | { | ||
113 | tmu_timer_set_interval(TMU0,cycles, evt->mode == CLOCK_EVT_MODE_PERIODIC); | ||
114 | _tmu_set_irq(TMU0,1); | ||
115 | return 0; | ||
116 | } | ||
117 | |||
118 | static void tmu_set_mode(enum clock_event_mode mode, | ||
119 | struct clock_event_device *evt) | ||
120 | { | ||
121 | switch (mode) { | ||
122 | case CLOCK_EVT_MODE_PERIODIC: | ||
123 | ctrl_outl(tmu_latest_interval[TMU0], TMU0_TCOR); | ||
124 | break; | ||
125 | case CLOCK_EVT_MODE_ONESHOT: | ||
126 | ctrl_outl(0, TMU0_TCOR); | ||
127 | break; | ||
128 | case CLOCK_EVT_MODE_UNUSED: | ||
129 | case CLOCK_EVT_MODE_SHUTDOWN: | ||
130 | case CLOCK_EVT_MODE_RESUME: | ||
131 | break; | ||
132 | } | ||
133 | } | ||
134 | |||
135 | static struct clock_event_device tmu0_clockevent = { | ||
136 | .name = "tmu0", | ||
137 | .shift = 32, | ||
138 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, | ||
139 | .set_mode = tmu_set_mode, | ||
140 | .set_next_event = tmu_set_next_event, | ||
141 | }; | ||
142 | |||
143 | static irqreturn_t tmu_timer_interrupt(int irq, void *dummy) | ||
144 | { | ||
145 | struct clock_event_device *evt = &tmu0_clockevent; | ||
146 | _tmu_clear_status(TMU0); | ||
147 | _tmu_set_irq(TMU0,tmu0_clockevent.mode != CLOCK_EVT_MODE_ONESHOT); | ||
148 | |||
149 | switch (tmu0_clockevent.mode) { | ||
150 | case CLOCK_EVT_MODE_ONESHOT: | ||
151 | case CLOCK_EVT_MODE_PERIODIC: | ||
152 | evt->event_handler(evt); | ||
153 | break; | ||
154 | default: | ||
155 | break; | ||
156 | } | ||
157 | |||
158 | return IRQ_HANDLED; | ||
159 | } | ||
160 | |||
161 | static struct irqaction tmu0_irq = { | ||
162 | .name = "periodic/oneshot timer", | ||
163 | .handler = tmu_timer_interrupt, | ||
164 | .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, | ||
165 | }; | ||
166 | |||
167 | static void __init tmu_clk_init(struct clk *clk) | ||
168 | { | ||
169 | u8 divisor = TMU_TCR_INIT & 0x7; | ||
170 | int tmu_num = clk->name[3]-'0'; | ||
171 | ctrl_outw(TMU_TCR_INIT, TMU0_TCR+(tmu_num*0xC)); | ||
172 | clk->rate = clk_get_rate(clk->parent) / (4 << (divisor << 1)); | ||
173 | } | ||
174 | |||
175 | static void tmu_clk_recalc(struct clk *clk) | ||
176 | { | ||
177 | int tmu_num = clk->name[3]-'0'; | ||
178 | unsigned long prev_rate = clk_get_rate(clk); | ||
179 | unsigned long flags; | ||
180 | u8 divisor = ctrl_inw(TMU0_TCR+tmu_num*0xC) & 0x7; | ||
181 | clk->rate = clk_get_rate(clk->parent) / (4 << (divisor << 1)); | ||
182 | |||
183 | if(prev_rate==clk_get_rate(clk)) | ||
184 | return; | ||
185 | |||
186 | if(tmu_num) | ||
187 | return; /* No more work on TMU1 */ | ||
188 | |||
189 | local_irq_save(flags); | ||
190 | tmus_are_scaled = (prev_rate > clk->rate); | ||
191 | |||
192 | _tmu_stop(TMU0); | ||
193 | |||
194 | tmu0_clockevent.mult = div_sc(clk->rate, NSEC_PER_SEC, | ||
195 | tmu0_clockevent.shift); | ||
196 | tmu0_clockevent.max_delta_ns = | ||
197 | clockevent_delta2ns(-1, &tmu0_clockevent); | ||
198 | tmu0_clockevent.min_delta_ns = | ||
199 | clockevent_delta2ns(1, &tmu0_clockevent); | ||
200 | |||
201 | if (tmus_are_scaled) | ||
202 | tmu_latest_interval[TMU0] >>= 1; | ||
203 | else | ||
204 | tmu_latest_interval[TMU0] <<= 1; | ||
205 | |||
206 | tmu_timer_set_interval(TMU0, | ||
207 | tmu_latest_interval[TMU0], | ||
208 | tmu0_clockevent.mode == CLOCK_EVT_MODE_PERIODIC); | ||
209 | |||
210 | _tmu_start(TMU0); | ||
211 | |||
212 | local_irq_restore(flags); | ||
213 | } | ||
214 | |||
215 | static struct clk_ops tmu_clk_ops = { | ||
216 | .init = tmu_clk_init, | ||
217 | .recalc = tmu_clk_recalc, | ||
218 | }; | ||
219 | |||
220 | static struct clk tmu0_clk = { | ||
221 | .name = "tmu0_clk", | ||
222 | .ops = &tmu_clk_ops, | ||
223 | }; | ||
224 | |||
225 | static struct clk tmu1_clk = { | ||
226 | .name = "tmu1_clk", | ||
227 | .ops = &tmu_clk_ops, | ||
228 | }; | ||
229 | |||
230 | static int tmu_timer_init(void) | ||
231 | { | ||
232 | unsigned long interval; | ||
233 | unsigned long frequency; | ||
234 | |||
235 | setup_irq(CONFIG_SH_TIMER_IRQ, &tmu0_irq); | ||
236 | |||
237 | tmu0_clk.parent = clk_get(NULL, "module_clk"); | ||
238 | tmu1_clk.parent = clk_get(NULL, "module_clk"); | ||
239 | |||
240 | tmu_timer_stop(); | ||
241 | |||
242 | #if !defined(CONFIG_CPU_SUBTYPE_SH7720) && \ | ||
243 | !defined(CONFIG_CPU_SUBTYPE_SH7721) && \ | ||
244 | !defined(CONFIG_CPU_SUBTYPE_SH7760) && \ | ||
245 | !defined(CONFIG_CPU_SUBTYPE_SH7785) && \ | ||
246 | !defined(CONFIG_CPU_SUBTYPE_SH7786) && \ | ||
247 | !defined(CONFIG_CPU_SUBTYPE_SHX3) | ||
248 | ctrl_outb(TMU_TOCR_INIT, TMU_TOCR); | ||
249 | #endif | ||
250 | |||
251 | clk_register(&tmu0_clk); | ||
252 | clk_register(&tmu1_clk); | ||
253 | clk_enable(&tmu0_clk); | ||
254 | clk_enable(&tmu1_clk); | ||
255 | |||
256 | frequency = clk_get_rate(&tmu0_clk); | ||
257 | interval = (frequency + HZ / 2) / HZ; | ||
258 | |||
259 | tmu_timer_set_interval(TMU0,interval, 1); | ||
260 | tmu_timer_set_interval(TMU1,~0,1); | ||
261 | |||
262 | _tmu_start(TMU1); | ||
263 | |||
264 | clocksource_sh.rating = 200; | ||
265 | clocksource_sh.mask = CLOCKSOURCE_MASK(32); | ||
266 | clocksource_sh.read = tmu_timer_read; | ||
267 | clocksource_sh.shift = 10; | ||
268 | clocksource_sh.mult = clocksource_hz2mult(clk_get_rate(&tmu1_clk), | ||
269 | clocksource_sh.shift); | ||
270 | clocksource_sh.flags = CLOCK_SOURCE_IS_CONTINUOUS; | ||
271 | clocksource_register(&clocksource_sh); | ||
272 | |||
273 | tmu0_clockevent.mult = div_sc(frequency, NSEC_PER_SEC, | ||
274 | tmu0_clockevent.shift); | ||
275 | tmu0_clockevent.max_delta_ns = | ||
276 | clockevent_delta2ns(-1, &tmu0_clockevent); | ||
277 | tmu0_clockevent.min_delta_ns = | ||
278 | clockevent_delta2ns(1, &tmu0_clockevent); | ||
279 | |||
280 | tmu0_clockevent.cpumask = cpumask_of(0); | ||
281 | tmu0_clockevent.rating = 100; | ||
282 | |||
283 | clockevents_register_device(&tmu0_clockevent); | ||
284 | |||
285 | return 0; | ||
286 | } | ||
287 | |||
288 | static struct sys_timer_ops tmu_timer_ops = { | ||
289 | .init = tmu_timer_init, | ||
290 | .start = tmu_timer_start, | ||
291 | .stop = tmu_timer_stop, | ||
292 | }; | ||
293 | |||
294 | struct sys_timer tmu_timer = { | ||
295 | .name = "tmu", | ||
296 | .ops = &tmu_timer_ops, | ||
297 | }; | ||