1 /*
2 * gptimers.c - Blackfin General Purpose Timer core API
3 *
4 * Copyright (c) 2005-2008 Analog Devices Inc.
5 * Copyright (C) 2005 John DeHority
6 * Copyright (C) 2006 Hella Aglaia GmbH (awe@aglaia-gmbh.de)
7 *
8 * Licensed under the GPLv2.
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/io.h>
14
15 #include <asm/blackfin.h>
16 #include <asm/gptimers.h>
17
18 #ifdef DEBUG
19 # define tassert(expr)
20 #else
21 # define tassert(expr) \
22 if (!(expr)) \
23 printk(KERN_DEBUG "%s:%s:%i: Assertion failed: " #expr "\n", __FILE__, __func__, __LINE__);
24 #endif
25
26 #define BFIN_TIMER_NUM_GROUP (BFIN_TIMER_OCTET(MAX_BLACKFIN_GPTIMERS - 1) + 1)
27
28 typedef struct {
29 uint16_t config;
30 uint16_t __pad;
31 uint32_t counter;
32 uint32_t period;
33 uint32_t width;
34 } GPTIMER_timer_regs;
35
36 typedef struct {
37 uint16_t enable;
38 uint16_t __pad0;
39 uint16_t disable;
40 uint16_t __pad1;
41 uint32_t status;
42 } GPTIMER_group_regs;
43
44 static volatile GPTIMER_timer_regs *const timer_regs[MAX_BLACKFIN_GPTIMERS] =
45 {
46 (GPTIMER_timer_regs *)TIMER0_CONFIG,
47 (GPTIMER_timer_regs *)TIMER1_CONFIG,
48 (GPTIMER_timer_regs *)TIMER2_CONFIG,
49 #if (MAX_BLACKFIN_GPTIMERS > 3)
50 (GPTIMER_timer_regs *)TIMER3_CONFIG,
51 (GPTIMER_timer_regs *)TIMER4_CONFIG,
52 (GPTIMER_timer_regs *)TIMER5_CONFIG,
53 (GPTIMER_timer_regs *)TIMER6_CONFIG,
54 (GPTIMER_timer_regs *)TIMER7_CONFIG,
55 # if (MAX_BLACKFIN_GPTIMERS > 8)
56 (GPTIMER_timer_regs *)TIMER8_CONFIG,
57 (GPTIMER_timer_regs *)TIMER9_CONFIG,
58 (GPTIMER_timer_regs *)TIMER10_CONFIG,
59 # if (MAX_BLACKFIN_GPTIMERS > 11)
60 (GPTIMER_timer_regs *)TIMER11_CONFIG,
61 # endif
62 # endif
63 #endif
64 };
65
66 static volatile GPTIMER_group_regs *const group_regs[BFIN_TIMER_NUM_GROUP] =
67 {
68 (GPTIMER_group_regs *)TIMER0_GROUP_REG,
69 #if (MAX_BLACKFIN_GPTIMERS > 8)
70 (GPTIMER_group_regs *)TIMER8_GROUP_REG,
71 #endif
72 };
73
74 static uint32_t const trun_mask[MAX_BLACKFIN_GPTIMERS] =
75 {
76 TIMER_STATUS_TRUN0,
77 TIMER_STATUS_TRUN1,
78 TIMER_STATUS_TRUN2,
79 #if (MAX_BLACKFIN_GPTIMERS > 3)
80 TIMER_STATUS_TRUN3,
81 TIMER_STATUS_TRUN4,
82 TIMER_STATUS_TRUN5,
83 TIMER_STATUS_TRUN6,
84 TIMER_STATUS_TRUN7,
85 # if (MAX_BLACKFIN_GPTIMERS > 8)
86 TIMER_STATUS_TRUN8,
87 TIMER_STATUS_TRUN9,
88 TIMER_STATUS_TRUN10,
89 # if (MAX_BLACKFIN_GPTIMERS > 11)
90 TIMER_STATUS_TRUN11,
91 # endif
92 # endif
93 #endif
94 };
95
96 static uint32_t const tovf_mask[MAX_BLACKFIN_GPTIMERS] =
97 {
98 TIMER_STATUS_TOVF0,
99 TIMER_STATUS_TOVF1,
100 TIMER_STATUS_TOVF2,
101 #if (MAX_BLACKFIN_GPTIMERS > 3)
102 TIMER_STATUS_TOVF3,
103 TIMER_STATUS_TOVF4,
104 TIMER_STATUS_TOVF5,
105 TIMER_STATUS_TOVF6,
106 TIMER_STATUS_TOVF7,
107 # if (MAX_BLACKFIN_GPTIMERS > 8)
108 TIMER_STATUS_TOVF8,
109 TIMER_STATUS_TOVF9,
110 TIMER_STATUS_TOVF10,
111 # if (MAX_BLACKFIN_GPTIMERS > 11)
112 TIMER_STATUS_TOVF11,
113 # endif
114 # endif
115 #endif
116 };
117
118 static uint32_t const timil_mask[MAX_BLACKFIN_GPTIMERS] =
119 {
120 TIMER_STATUS_TIMIL0,
121 TIMER_STATUS_TIMIL1,
122 TIMER_STATUS_TIMIL2,
123 #if (MAX_BLACKFIN_GPTIMERS > 3)
124 TIMER_STATUS_TIMIL3,
125 TIMER_STATUS_TIMIL4,
126 TIMER_STATUS_TIMIL5,
127 TIMER_STATUS_TIMIL6,
128 TIMER_STATUS_TIMIL7,
129 # if (MAX_BLACKFIN_GPTIMERS > 8)
130 TIMER_STATUS_TIMIL8,
131 TIMER_STATUS_TIMIL9,
132 TIMER_STATUS_TIMIL10,
133 # if (MAX_BLACKFIN_GPTIMERS > 11)
134 TIMER_STATUS_TIMIL11,
135 # endif
136 # endif
137 #endif
138 };
139
set_gptimer_pwidth(int timer_id,uint32_t value)140 void set_gptimer_pwidth(int timer_id, uint32_t value)
141 {
142 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
143 timer_regs[timer_id]->width = value;
144 SSYNC();
145 }
146 EXPORT_SYMBOL(set_gptimer_pwidth);
147
get_gptimer_pwidth(int timer_id)148 uint32_t get_gptimer_pwidth(int timer_id)
149 {
150 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
151 return timer_regs[timer_id]->width;
152 }
153 EXPORT_SYMBOL(get_gptimer_pwidth);
154
set_gptimer_period(int timer_id,uint32_t period)155 void set_gptimer_period(int timer_id, uint32_t period)
156 {
157 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
158 timer_regs[timer_id]->period = period;
159 SSYNC();
160 }
161 EXPORT_SYMBOL(set_gptimer_period);
162
get_gptimer_period(int timer_id)163 uint32_t get_gptimer_period(int timer_id)
164 {
165 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
166 return timer_regs[timer_id]->period;
167 }
168 EXPORT_SYMBOL(get_gptimer_period);
169
get_gptimer_count(int timer_id)170 uint32_t get_gptimer_count(int timer_id)
171 {
172 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
173 return timer_regs[timer_id]->counter;
174 }
175 EXPORT_SYMBOL(get_gptimer_count);
176
get_gptimer_status(int group)177 uint32_t get_gptimer_status(int group)
178 {
179 tassert(group < BFIN_TIMER_NUM_GROUP);
180 return group_regs[group]->status;
181 }
182 EXPORT_SYMBOL(get_gptimer_status);
183
set_gptimer_status(int group,uint32_t value)184 void set_gptimer_status(int group, uint32_t value)
185 {
186 tassert(group < BFIN_TIMER_NUM_GROUP);
187 group_regs[group]->status = value;
188 SSYNC();
189 }
190 EXPORT_SYMBOL(set_gptimer_status);
191
get_gptimer_intr(int timer_id)192 uint16_t get_gptimer_intr(int timer_id)
193 {
194 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
195 return (group_regs[BFIN_TIMER_OCTET(timer_id)]->status & timil_mask[timer_id]) ? 1 : 0;
196 }
197 EXPORT_SYMBOL(get_gptimer_intr);
198
clear_gptimer_intr(int timer_id)199 void clear_gptimer_intr(int timer_id)
200 {
201 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
202 group_regs[BFIN_TIMER_OCTET(timer_id)]->status = timil_mask[timer_id];
203 }
204 EXPORT_SYMBOL(clear_gptimer_intr);
205
get_gptimer_over(int timer_id)206 uint16_t get_gptimer_over(int timer_id)
207 {
208 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
209 return (group_regs[BFIN_TIMER_OCTET(timer_id)]->status & tovf_mask[timer_id]) ? 1 : 0;
210 }
211 EXPORT_SYMBOL(get_gptimer_over);
212
clear_gptimer_over(int timer_id)213 void clear_gptimer_over(int timer_id)
214 {
215 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
216 group_regs[BFIN_TIMER_OCTET(timer_id)]->status = tovf_mask[timer_id];
217 }
218 EXPORT_SYMBOL(clear_gptimer_over);
219
set_gptimer_config(int timer_id,uint16_t config)220 void set_gptimer_config(int timer_id, uint16_t config)
221 {
222 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
223 timer_regs[timer_id]->config = config;
224 SSYNC();
225 }
226 EXPORT_SYMBOL(set_gptimer_config);
227
get_gptimer_config(int timer_id)228 uint16_t get_gptimer_config(int timer_id)
229 {
230 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
231 return timer_regs[timer_id]->config;
232 }
233 EXPORT_SYMBOL(get_gptimer_config);
234
enable_gptimers(uint16_t mask)235 void enable_gptimers(uint16_t mask)
236 {
237 int i;
238 tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
239 for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
240 group_regs[i]->enable = mask & 0xFF;
241 mask >>= 8;
242 }
243 SSYNC();
244 }
245 EXPORT_SYMBOL(enable_gptimers);
246
disable_gptimers(uint16_t mask)247 void disable_gptimers(uint16_t mask)
248 {
249 int i;
250 uint16_t m = mask;
251 tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
252 for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
253 group_regs[i]->disable = m & 0xFF;
254 m >>= 8;
255 }
256 for (i = 0; i < MAX_BLACKFIN_GPTIMERS; ++i)
257 if (mask & (1 << i))
258 group_regs[BFIN_TIMER_OCTET(i)]->status |= trun_mask[i];
259 SSYNC();
260 }
261 EXPORT_SYMBOL(disable_gptimers);
262
set_gptimer_pulse_hi(int timer_id)263 void set_gptimer_pulse_hi(int timer_id)
264 {
265 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
266 timer_regs[timer_id]->config |= TIMER_PULSE_HI;
267 SSYNC();
268 }
269 EXPORT_SYMBOL(set_gptimer_pulse_hi);
270
clear_gptimer_pulse_hi(int timer_id)271 void clear_gptimer_pulse_hi(int timer_id)
272 {
273 tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
274 timer_regs[timer_id]->config &= ~TIMER_PULSE_HI;
275 SSYNC();
276 }
277 EXPORT_SYMBOL(clear_gptimer_pulse_hi);
278
get_enabled_gptimers(void)279 uint16_t get_enabled_gptimers(void)
280 {
281 int i;
282 uint16_t result = 0;
283 for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i)
284 result |= (group_regs[i]->enable << (i << 3));
285 return result;
286 }
287 EXPORT_SYMBOL(get_enabled_gptimers);
288
289 MODULE_AUTHOR("Axel Weiss (awe@aglaia-gmbh.de)");
290 MODULE_DESCRIPTION("Blackfin General Purpose Timers API");
291 MODULE_LICENSE("GPL");
292