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1 | /* |
2 | * Timer/Counter Unit (TC) registers. | |
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 | #ifndef ATMEL_TC_H | |
11 | #define ATMEL_TC_H | |
12 | ||
13 | #include <linux/compiler.h> | |
14 | #include <linux/list.h> | |
15 | ||
16 | /* | |
17 | * Many 32-bit Atmel SOCs include one or more TC blocks, each of which holds | |
18 | * three general-purpose 16-bit timers. These timers share one register bank. | |
19 | * Depending on the SOC, each timer may have its own clock and IRQ, or those | |
20 | * may be shared by the whole TC block. | |
21 | * | |
22 | * These TC blocks may have up to nine external pins: TCLK0..2 signals for | |
23 | * clocks or clock gates, and per-timer TIOA and TIOB signals used for PWM | |
24 | * or triggering. Those pins need to be set up for use with the TC block, | |
25 | * else they will be used as GPIOs or for a different controller. | |
26 | * | |
27 | * Although we expect each TC block to have a platform_device node, those | |
28 | * nodes are not what drivers bind to. Instead, they ask for a specific | |
29 | * TC block, by number ... which is a common approach on systems with many | |
30 | * timers. Then they use clk_get() and platform_get_irq() to get clock and | |
31 | * IRQ resources. | |
32 | */ | |
33 | ||
34 | struct clk; | |
35 | ||
36 | /** | |
37 | * struct atmel_tc - information about a Timer/Counter Block | |
38 | * @pdev: physical device | |
39 | * @iomem: resource associated with the I/O register | |
40 | * @regs: mapping through which the I/O registers can be accessed | |
41 | * @irq: irq for each of the three channels | |
42 | * @clk: internal clock source for each of the three channels | |
43 | * @node: list node, for tclib internal use | |
44 | * | |
45 | * On some platforms, each TC channel has its own clocks and IRQs, | |
46 | * while on others, all TC channels share the same clock and IRQ. | |
47 | * Drivers should clk_enable() all the clocks they need even though | |
48 | * all the entries in @clk may point to the same physical clock. | |
49 | * Likewise, drivers should request irqs independently for each | |
50 | * channel, but they must use IRQF_SHARED in case some of the entries | |
51 | * in @irq are actually the same IRQ. | |
52 | */ | |
53 | struct atmel_tc { | |
54 | struct platform_device *pdev; | |
55 | struct resource *iomem; | |
56 | void __iomem *regs; | |
57 | int irq[3]; | |
58 | struct clk *clk[3]; | |
59 | struct list_head node; | |
60 | }; | |
61 | ||
62 | extern struct atmel_tc *atmel_tc_alloc(unsigned block, const char *name); | |
63 | extern void atmel_tc_free(struct atmel_tc *tc); | |
64 | ||
65 | /* platform-specific ATMEL_TC_TIMER_CLOCKx divisors (0 means 32KiHz) */ | |
66 | extern const u8 atmel_tc_divisors[5]; | |
67 | ||
68 | ||
69 | /* | |
70 | * Two registers have block-wide controls. These are: configuring the three | |
71 | * "external" clocks (or event sources) used by the timer channels; and | |
72 | * synchronizing the timers by resetting them all at once. | |
73 | * | |
74 | * "External" can mean "external to chip" using the TCLK0, TCLK1, or TCLK2 | |
75 | * signals. Or, it can mean "external to timer", using the TIOA output from | |
76 | * one of the other two timers that's being run in waveform mode. | |
77 | */ | |
78 | ||
79 | #define ATMEL_TC_BCR 0xc0 /* TC Block Control Register */ | |
80 | #define ATMEL_TC_SYNC (1 << 0) /* synchronize timers */ | |
81 | ||
82 | #define ATMEL_TC_BMR 0xc4 /* TC Block Mode Register */ | |
83 | #define ATMEL_TC_TC0XC0S (3 << 0) /* external clock 0 source */ | |
84 | #define ATMEL_TC_TC0XC0S_TCLK0 (0 << 0) | |
85 | #define ATMEL_TC_TC0XC0S_NONE (1 << 0) | |
86 | #define ATMEL_TC_TC0XC0S_TIOA1 (2 << 0) | |
87 | #define ATMEL_TC_TC0XC0S_TIOA2 (3 << 0) | |
88 | #define ATMEL_TC_TC1XC1S (3 << 2) /* external clock 1 source */ | |
89 | #define ATMEL_TC_TC1XC1S_TCLK1 (0 << 2) | |
90 | #define ATMEL_TC_TC1XC1S_NONE (1 << 2) | |
91 | #define ATMEL_TC_TC1XC1S_TIOA0 (2 << 2) | |
92 | #define ATMEL_TC_TC1XC1S_TIOA2 (3 << 2) | |
93 | #define ATMEL_TC_TC2XC2S (3 << 4) /* external clock 2 source */ | |
94 | #define ATMEL_TC_TC2XC2S_TCLK2 (0 << 4) | |
95 | #define ATMEL_TC_TC2XC2S_NONE (1 << 4) | |
96 | #define ATMEL_TC_TC2XC2S_TIOA0 (2 << 4) | |
97 | #define ATMEL_TC_TC2XC2S_TIOA1 (3 << 4) | |
98 | ||
99 | ||
100 | /* | |
101 | * Each TC block has three "channels", each with one counter and controls. | |
102 | * | |
103 | * Note that the semantics of ATMEL_TC_TIMER_CLOCKx (input clock selection | |
104 | * when it's not "external") is silicon-specific. AT91 platforms use one | |
105 | * set of definitions; AVR32 platforms use a different set. Don't hard-wire | |
106 | * such knowledge into your code, use the global "atmel_tc_divisors" ... | |
107 | * where index N is the divisor for clock N+1, else zero to indicate it uses | |
108 | * the 32 KiHz clock. | |
109 | * | |
110 | * The timers can be chained in various ways, and operated in "waveform" | |
111 | * generation mode (including PWM) or "capture" mode (to time events). In | |
112 | * both modes, behavior can be configured in many ways. | |
113 | * | |
114 | * Each timer has two I/O pins, TIOA and TIOB. Waveform mode uses TIOA as a | |
115 | * PWM output, and TIOB as either another PWM or as a trigger. Capture mode | |
116 | * uses them only as inputs. | |
117 | */ | |
118 | #define ATMEL_TC_CHAN(idx) ((idx)*0x40) | |
119 | #define ATMEL_TC_REG(idx, reg) (ATMEL_TC_CHAN(idx) + ATMEL_TC_ ## reg) | |
120 | ||
121 | #define ATMEL_TC_CCR 0x00 /* Channel Control Register */ | |
122 | #define ATMEL_TC_CLKEN (1 << 0) /* clock enable */ | |
123 | #define ATMEL_TC_CLKDIS (1 << 1) /* clock disable */ | |
124 | #define ATMEL_TC_SWTRG (1 << 2) /* software trigger */ | |
125 | ||
126 | #define ATMEL_TC_CMR 0x04 /* Channel Mode Register */ | |
127 | ||
128 | /* Both modes share some CMR bits */ | |
129 | #define ATMEL_TC_TCCLKS (7 << 0) /* clock source */ | |
130 | #define ATMEL_TC_TIMER_CLOCK1 (0 << 0) | |
131 | #define ATMEL_TC_TIMER_CLOCK2 (1 << 0) | |
132 | #define ATMEL_TC_TIMER_CLOCK3 (2 << 0) | |
133 | #define ATMEL_TC_TIMER_CLOCK4 (3 << 0) | |
134 | #define ATMEL_TC_TIMER_CLOCK5 (4 << 0) | |
135 | #define ATMEL_TC_XC0 (5 << 0) | |
136 | #define ATMEL_TC_XC1 (6 << 0) | |
137 | #define ATMEL_TC_XC2 (7 << 0) | |
138 | #define ATMEL_TC_CLKI (1 << 3) /* clock invert */ | |
139 | #define ATMEL_TC_BURST (3 << 4) /* clock gating */ | |
140 | #define ATMEL_TC_GATE_NONE (0 << 4) | |
141 | #define ATMEL_TC_GATE_XC0 (1 << 4) | |
142 | #define ATMEL_TC_GATE_XC1 (2 << 4) | |
143 | #define ATMEL_TC_GATE_XC2 (3 << 4) | |
144 | #define ATMEL_TC_WAVE (1 << 15) /* true = Waveform mode */ | |
145 | ||
146 | /* CAPTURE mode CMR bits */ | |
147 | #define ATMEL_TC_LDBSTOP (1 << 6) /* counter stops on RB load */ | |
148 | #define ATMEL_TC_LDBDIS (1 << 7) /* counter disable on RB load */ | |
149 | #define ATMEL_TC_ETRGEDG (3 << 8) /* external trigger edge */ | |
150 | #define ATMEL_TC_ETRGEDG_NONE (0 << 8) | |
151 | #define ATMEL_TC_ETRGEDG_RISING (1 << 8) | |
152 | #define ATMEL_TC_ETRGEDG_FALLING (2 << 8) | |
153 | #define ATMEL_TC_ETRGEDG_BOTH (3 << 8) | |
154 | #define ATMEL_TC_ABETRG (1 << 10) /* external trigger is TIOA? */ | |
155 | #define ATMEL_TC_CPCTRG (1 << 14) /* RC compare trigger enable */ | |
156 | #define ATMEL_TC_LDRA (3 << 16) /* RA loading edge (of TIOA) */ | |
157 | #define ATMEL_TC_LDRA_NONE (0 << 16) | |
158 | #define ATMEL_TC_LDRA_RISING (1 << 16) | |
159 | #define ATMEL_TC_LDRA_FALLING (2 << 16) | |
160 | #define ATMEL_TC_LDRA_BOTH (3 << 16) | |
161 | #define ATMEL_TC_LDRB (3 << 18) /* RB loading edge (of TIOA) */ | |
162 | #define ATMEL_TC_LDRB_NONE (0 << 18) | |
163 | #define ATMEL_TC_LDRB_RISING (1 << 18) | |
164 | #define ATMEL_TC_LDRB_FALLING (2 << 18) | |
165 | #define ATMEL_TC_LDRB_BOTH (3 << 18) | |
166 | ||
167 | /* WAVEFORM mode CMR bits */ | |
168 | #define ATMEL_TC_CPCSTOP (1 << 6) /* RC compare stops counter */ | |
169 | #define ATMEL_TC_CPCDIS (1 << 7) /* RC compare disables counter */ | |
170 | #define ATMEL_TC_EEVTEDG (3 << 8) /* external event edge */ | |
171 | #define ATMEL_TC_EEVTEDG_NONE (0 << 8) | |
172 | #define ATMEL_TC_EEVTEDG_RISING (1 << 8) | |
173 | #define ATMEL_TC_EEVTEDG_FALLING (2 << 8) | |
174 | #define ATMEL_TC_EEVTEDG_BOTH (3 << 8) | |
175 | #define ATMEL_TC_EEVT (3 << 10) /* external event source */ | |
176 | #define ATMEL_TC_EEVT_TIOB (0 << 10) | |
177 | #define ATMEL_TC_EEVT_XC0 (1 << 10) | |
178 | #define ATMEL_TC_EEVT_XC1 (2 << 10) | |
179 | #define ATMEL_TC_EEVT_XC2 (3 << 10) | |
180 | #define ATMEL_TC_ENETRG (1 << 12) /* external event is trigger */ | |
181 | #define ATMEL_TC_WAVESEL (3 << 13) /* waveform type */ | |
182 | #define ATMEL_TC_WAVESEL_UP (0 << 13) | |
183 | #define ATMEL_TC_WAVESEL_UPDOWN (1 << 13) | |
184 | #define ATMEL_TC_WAVESEL_UP_AUTO (2 << 13) | |
185 | #define ATMEL_TC_WAVESEL_UPDOWN_AUTO (3 << 13) | |
186 | #define ATMEL_TC_ACPA (3 << 16) /* RA compare changes TIOA */ | |
187 | #define ATMEL_TC_ACPA_NONE (0 << 16) | |
188 | #define ATMEL_TC_ACPA_SET (1 << 16) | |
189 | #define ATMEL_TC_ACPA_CLEAR (2 << 16) | |
190 | #define ATMEL_TC_ACPA_TOGGLE (3 << 16) | |
191 | #define ATMEL_TC_ACPC (3 << 18) /* RC compare changes TIOA */ | |
192 | #define ATMEL_TC_ACPC_NONE (0 << 18) | |
193 | #define ATMEL_TC_ACPC_SET (1 << 18) | |
194 | #define ATMEL_TC_ACPC_CLEAR (2 << 18) | |
195 | #define ATMEL_TC_ACPC_TOGGLE (3 << 18) | |
196 | #define ATMEL_TC_AEEVT (3 << 20) /* external event changes TIOA */ | |
197 | #define ATMEL_TC_AEEVT_NONE (0 << 20) | |
198 | #define ATMEL_TC_AEEVT_SET (1 << 20) | |
199 | #define ATMEL_TC_AEEVT_CLEAR (2 << 20) | |
200 | #define ATMEL_TC_AEEVT_TOGGLE (3 << 20) | |
201 | #define ATMEL_TC_ASWTRG (3 << 22) /* software trigger changes TIOA */ | |
202 | #define ATMEL_TC_ASWTRG_NONE (0 << 22) | |
203 | #define ATMEL_TC_ASWTRG_SET (1 << 22) | |
204 | #define ATMEL_TC_ASWTRG_CLEAR (2 << 22) | |
205 | #define ATMEL_TC_ASWTRG_TOGGLE (3 << 22) | |
206 | #define ATMEL_TC_BCPB (3 << 24) /* RB compare changes TIOB */ | |
207 | #define ATMEL_TC_BCPB_NONE (0 << 24) | |
208 | #define ATMEL_TC_BCPB_SET (1 << 24) | |
209 | #define ATMEL_TC_BCPB_CLEAR (2 << 24) | |
210 | #define ATMEL_TC_BCPB_TOGGLE (3 << 24) | |
211 | #define ATMEL_TC_BCPC (3 << 26) /* RC compare changes TIOB */ | |
212 | #define ATMEL_TC_BCPC_NONE (0 << 26) | |
213 | #define ATMEL_TC_BCPC_SET (1 << 26) | |
214 | #define ATMEL_TC_BCPC_CLEAR (2 << 26) | |
215 | #define ATMEL_TC_BCPC_TOGGLE (3 << 26) | |
216 | #define ATMEL_TC_BEEVT (3 << 28) /* external event changes TIOB */ | |
217 | #define ATMEL_TC_BEEVT_NONE (0 << 28) | |
218 | #define ATMEL_TC_BEEVT_SET (1 << 28) | |
219 | #define ATMEL_TC_BEEVT_CLEAR (2 << 28) | |
220 | #define ATMEL_TC_BEEVT_TOGGLE (3 << 28) | |
221 | #define ATMEL_TC_BSWTRG (3 << 30) /* software trigger changes TIOB */ | |
222 | #define ATMEL_TC_BSWTRG_NONE (0 << 30) | |
223 | #define ATMEL_TC_BSWTRG_SET (1 << 30) | |
224 | #define ATMEL_TC_BSWTRG_CLEAR (2 << 30) | |
225 | #define ATMEL_TC_BSWTRG_TOGGLE (3 << 30) | |
226 | ||
227 | #define ATMEL_TC_CV 0x10 /* counter Value */ | |
228 | #define ATMEL_TC_RA 0x14 /* register A */ | |
229 | #define ATMEL_TC_RB 0x18 /* register B */ | |
230 | #define ATMEL_TC_RC 0x1c /* register C */ | |
231 | ||
232 | #define ATMEL_TC_SR 0x20 /* status (read-only) */ | |
233 | /* Status-only flags */ | |
234 | #define ATMEL_TC_CLKSTA (1 << 16) /* clock enabled */ | |
235 | #define ATMEL_TC_MTIOA (1 << 17) /* TIOA mirror */ | |
236 | #define ATMEL_TC_MTIOB (1 << 18) /* TIOB mirror */ | |
237 | ||
238 | #define ATMEL_TC_IER 0x24 /* interrupt enable (write-only) */ | |
239 | #define ATMEL_TC_IDR 0x28 /* interrupt disable (write-only) */ | |
240 | #define ATMEL_TC_IMR 0x2c /* interrupt mask (read-only) */ | |
241 | ||
242 | /* Status and IRQ flags */ | |
243 | #define ATMEL_TC_COVFS (1 << 0) /* counter overflow */ | |
244 | #define ATMEL_TC_LOVRS (1 << 1) /* load overrun */ | |
245 | #define ATMEL_TC_CPAS (1 << 2) /* RA compare */ | |
246 | #define ATMEL_TC_CPBS (1 << 3) /* RB compare */ | |
247 | #define ATMEL_TC_CPCS (1 << 4) /* RC compare */ | |
248 | #define ATMEL_TC_LDRAS (1 << 5) /* RA loading */ | |
249 | #define ATMEL_TC_LDRBS (1 << 6) /* RB loading */ | |
250 | #define ATMEL_TC_ETRGS (1 << 7) /* external trigger */ | |
251 | ||
252 | #endif |