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_tcb_config - SoC data for a Timer/Counter Block
38  * @counter_width: size in bits of a timer counter register
39  */
40 struct atmel_tcb_config {
41 	size_t	counter_width;
42 };
43 
44 /**
45  * struct atmel_tc - information about a Timer/Counter Block
46  * @pdev: physical device
47  * @regs: mapping through which the I/O registers can be accessed
48  * @id: block id
49  * @tcb_config: configuration data from SoC
50  * @irq: irq for each of the three channels
51  * @clk: internal clock source for each of the three channels
52  * @node: list node, for tclib internal use
53  * @allocated: if already used, for tclib internal use
54  *
55  * On some platforms, each TC channel has its own clocks and IRQs,
56  * while on others, all TC channels share the same clock and IRQ.
57  * Drivers should clk_enable() all the clocks they need even though
58  * all the entries in @clk may point to the same physical clock.
59  * Likewise, drivers should request irqs independently for each
60  * channel, but they must use IRQF_SHARED in case some of the entries
61  * in @irq are actually the same IRQ.
62  */
63 struct atmel_tc {
64 	struct platform_device	*pdev;
65 	void __iomem		*regs;
66 	int                     id;
67 	const struct atmel_tcb_config *tcb_config;
68 	int			irq[3];
69 	struct clk		*clk[3];
70 	struct clk		*slow_clk;
71 	struct list_head	node;
72 	bool			allocated;
73 };
74 
75 extern struct atmel_tc *atmel_tc_alloc(unsigned block);
76 extern void atmel_tc_free(struct atmel_tc *tc);
77 
78 /* platform-specific ATMEL_TC_TIMER_CLOCKx divisors (0 means 32KiHz) */
79 extern const u8 atmel_tc_divisors[5];
80 
81 
82 /*
83  * Two registers have block-wide controls.  These are: configuring the three
84  * "external" clocks (or event sources) used by the timer channels; and
85  * synchronizing the timers by resetting them all at once.
86  *
87  * "External" can mean "external to chip" using the TCLK0, TCLK1, or TCLK2
88  * signals.  Or, it can mean "external to timer", using the TIOA output from
89  * one of the other two timers that's being run in waveform mode.
90  */
91 
92 #define ATMEL_TC_BCR	0xc0		/* TC Block Control Register */
93 #define     ATMEL_TC_SYNC	(1 << 0)	/* synchronize timers */
94 
95 #define ATMEL_TC_BMR	0xc4		/* TC Block Mode Register */
96 #define     ATMEL_TC_TC0XC0S	(3 << 0)	/* external clock 0 source */
97 #define        ATMEL_TC_TC0XC0S_TCLK0	(0 << 0)
98 #define        ATMEL_TC_TC0XC0S_NONE	(1 << 0)
99 #define        ATMEL_TC_TC0XC0S_TIOA1	(2 << 0)
100 #define        ATMEL_TC_TC0XC0S_TIOA2	(3 << 0)
101 #define     ATMEL_TC_TC1XC1S	(3 << 2)	/* external clock 1 source */
102 #define        ATMEL_TC_TC1XC1S_TCLK1	(0 << 2)
103 #define        ATMEL_TC_TC1XC1S_NONE	(1 << 2)
104 #define        ATMEL_TC_TC1XC1S_TIOA0	(2 << 2)
105 #define        ATMEL_TC_TC1XC1S_TIOA2	(3 << 2)
106 #define     ATMEL_TC_TC2XC2S	(3 << 4)	/* external clock 2 source */
107 #define        ATMEL_TC_TC2XC2S_TCLK2	(0 << 4)
108 #define        ATMEL_TC_TC2XC2S_NONE	(1 << 4)
109 #define        ATMEL_TC_TC2XC2S_TIOA0	(2 << 4)
110 #define        ATMEL_TC_TC2XC2S_TIOA1	(3 << 4)
111 
112 
113 /*
114  * Each TC block has three "channels", each with one counter and controls.
115  *
116  * Note that the semantics of ATMEL_TC_TIMER_CLOCKx (input clock selection
117  * when it's not "external") is silicon-specific.  AT91 platforms use one
118  * set of definitions; AVR32 platforms use a different set.  Don't hard-wire
119  * such knowledge into your code, use the global "atmel_tc_divisors" ...
120  * where index N is the divisor for clock N+1, else zero to indicate it uses
121  * the 32 KiHz clock.
122  *
123  * The timers can be chained in various ways, and operated in "waveform"
124  * generation mode (including PWM) or "capture" mode (to time events).  In
125  * both modes, behavior can be configured in many ways.
126  *
127  * Each timer has two I/O pins, TIOA and TIOB.  Waveform mode uses TIOA as a
128  * PWM output, and TIOB as either another PWM or as a trigger.  Capture mode
129  * uses them only as inputs.
130  */
131 #define ATMEL_TC_CHAN(idx)	((idx)*0x40)
132 #define ATMEL_TC_REG(idx, reg)	(ATMEL_TC_CHAN(idx) + ATMEL_TC_ ## reg)
133 
134 #define ATMEL_TC_CCR	0x00		/* Channel Control Register */
135 #define     ATMEL_TC_CLKEN	(1 << 0)	/* clock enable */
136 #define     ATMEL_TC_CLKDIS	(1 << 1)	/* clock disable */
137 #define     ATMEL_TC_SWTRG	(1 << 2)	/* software trigger */
138 
139 #define ATMEL_TC_CMR	0x04		/* Channel Mode Register */
140 
141 /* Both modes share some CMR bits */
142 #define     ATMEL_TC_TCCLKS	(7 << 0)	/* clock source */
143 #define        ATMEL_TC_TIMER_CLOCK1	(0 << 0)
144 #define        ATMEL_TC_TIMER_CLOCK2	(1 << 0)
145 #define        ATMEL_TC_TIMER_CLOCK3	(2 << 0)
146 #define        ATMEL_TC_TIMER_CLOCK4	(3 << 0)
147 #define        ATMEL_TC_TIMER_CLOCK5	(4 << 0)
148 #define        ATMEL_TC_XC0		(5 << 0)
149 #define        ATMEL_TC_XC1		(6 << 0)
150 #define        ATMEL_TC_XC2		(7 << 0)
151 #define     ATMEL_TC_CLKI	(1 << 3)	/* clock invert */
152 #define     ATMEL_TC_BURST	(3 << 4)	/* clock gating */
153 #define        ATMEL_TC_GATE_NONE	(0 << 4)
154 #define        ATMEL_TC_GATE_XC0	(1 << 4)
155 #define        ATMEL_TC_GATE_XC1	(2 << 4)
156 #define        ATMEL_TC_GATE_XC2	(3 << 4)
157 #define     ATMEL_TC_WAVE	(1 << 15)	/* true = Waveform mode */
158 
159 /* CAPTURE mode CMR bits */
160 #define     ATMEL_TC_LDBSTOP	(1 << 6)	/* counter stops on RB load */
161 #define     ATMEL_TC_LDBDIS	(1 << 7)	/* counter disable on RB load */
162 #define     ATMEL_TC_ETRGEDG	(3 << 8)	/* external trigger edge */
163 #define        ATMEL_TC_ETRGEDG_NONE	(0 << 8)
164 #define        ATMEL_TC_ETRGEDG_RISING	(1 << 8)
165 #define        ATMEL_TC_ETRGEDG_FALLING	(2 << 8)
166 #define        ATMEL_TC_ETRGEDG_BOTH	(3 << 8)
167 #define     ATMEL_TC_ABETRG	(1 << 10)	/* external trigger is TIOA? */
168 #define     ATMEL_TC_CPCTRG	(1 << 14)	/* RC compare trigger enable */
169 #define     ATMEL_TC_LDRA	(3 << 16)	/* RA loading edge (of TIOA) */
170 #define        ATMEL_TC_LDRA_NONE	(0 << 16)
171 #define        ATMEL_TC_LDRA_RISING	(1 << 16)
172 #define        ATMEL_TC_LDRA_FALLING	(2 << 16)
173 #define        ATMEL_TC_LDRA_BOTH	(3 << 16)
174 #define     ATMEL_TC_LDRB	(3 << 18)	/* RB loading edge (of TIOA) */
175 #define        ATMEL_TC_LDRB_NONE	(0 << 18)
176 #define        ATMEL_TC_LDRB_RISING	(1 << 18)
177 #define        ATMEL_TC_LDRB_FALLING	(2 << 18)
178 #define        ATMEL_TC_LDRB_BOTH	(3 << 18)
179 
180 /* WAVEFORM mode CMR bits */
181 #define     ATMEL_TC_CPCSTOP	(1 <<  6)	/* RC compare stops counter */
182 #define     ATMEL_TC_CPCDIS	(1 <<  7)	/* RC compare disables counter */
183 #define     ATMEL_TC_EEVTEDG	(3 <<  8)	/* external event edge */
184 #define        ATMEL_TC_EEVTEDG_NONE	(0 << 8)
185 #define        ATMEL_TC_EEVTEDG_RISING	(1 << 8)
186 #define        ATMEL_TC_EEVTEDG_FALLING	(2 << 8)
187 #define        ATMEL_TC_EEVTEDG_BOTH	(3 << 8)
188 #define     ATMEL_TC_EEVT	(3 << 10)	/* external event source */
189 #define        ATMEL_TC_EEVT_TIOB	(0 << 10)
190 #define        ATMEL_TC_EEVT_XC0	(1 << 10)
191 #define        ATMEL_TC_EEVT_XC1	(2 << 10)
192 #define        ATMEL_TC_EEVT_XC2	(3 << 10)
193 #define     ATMEL_TC_ENETRG	(1 << 12)	/* external event is trigger */
194 #define     ATMEL_TC_WAVESEL	(3 << 13)	/* waveform type */
195 #define        ATMEL_TC_WAVESEL_UP	(0 << 13)
196 #define        ATMEL_TC_WAVESEL_UPDOWN	(1 << 13)
197 #define        ATMEL_TC_WAVESEL_UP_AUTO	(2 << 13)
198 #define        ATMEL_TC_WAVESEL_UPDOWN_AUTO (3 << 13)
199 #define     ATMEL_TC_ACPA	(3 << 16)	/* RA compare changes TIOA */
200 #define        ATMEL_TC_ACPA_NONE	(0 << 16)
201 #define        ATMEL_TC_ACPA_SET	(1 << 16)
202 #define        ATMEL_TC_ACPA_CLEAR	(2 << 16)
203 #define        ATMEL_TC_ACPA_TOGGLE	(3 << 16)
204 #define     ATMEL_TC_ACPC	(3 << 18)	/* RC compare changes TIOA */
205 #define        ATMEL_TC_ACPC_NONE	(0 << 18)
206 #define        ATMEL_TC_ACPC_SET	(1 << 18)
207 #define        ATMEL_TC_ACPC_CLEAR	(2 << 18)
208 #define        ATMEL_TC_ACPC_TOGGLE	(3 << 18)
209 #define     ATMEL_TC_AEEVT	(3 << 20)	/* external event changes TIOA */
210 #define        ATMEL_TC_AEEVT_NONE	(0 << 20)
211 #define        ATMEL_TC_AEEVT_SET	(1 << 20)
212 #define        ATMEL_TC_AEEVT_CLEAR	(2 << 20)
213 #define        ATMEL_TC_AEEVT_TOGGLE	(3 << 20)
214 #define     ATMEL_TC_ASWTRG	(3 << 22)	/* software trigger changes TIOA */
215 #define        ATMEL_TC_ASWTRG_NONE	(0 << 22)
216 #define        ATMEL_TC_ASWTRG_SET	(1 << 22)
217 #define        ATMEL_TC_ASWTRG_CLEAR	(2 << 22)
218 #define        ATMEL_TC_ASWTRG_TOGGLE	(3 << 22)
219 #define     ATMEL_TC_BCPB	(3 << 24)	/* RB compare changes TIOB */
220 #define        ATMEL_TC_BCPB_NONE	(0 << 24)
221 #define        ATMEL_TC_BCPB_SET	(1 << 24)
222 #define        ATMEL_TC_BCPB_CLEAR	(2 << 24)
223 #define        ATMEL_TC_BCPB_TOGGLE	(3 << 24)
224 #define     ATMEL_TC_BCPC	(3 << 26)	/* RC compare changes TIOB */
225 #define        ATMEL_TC_BCPC_NONE	(0 << 26)
226 #define        ATMEL_TC_BCPC_SET	(1 << 26)
227 #define        ATMEL_TC_BCPC_CLEAR	(2 << 26)
228 #define        ATMEL_TC_BCPC_TOGGLE	(3 << 26)
229 #define     ATMEL_TC_BEEVT	(3 << 28)	/* external event changes TIOB */
230 #define        ATMEL_TC_BEEVT_NONE	(0 << 28)
231 #define        ATMEL_TC_BEEVT_SET	(1 << 28)
232 #define        ATMEL_TC_BEEVT_CLEAR	(2 << 28)
233 #define        ATMEL_TC_BEEVT_TOGGLE	(3 << 28)
234 #define     ATMEL_TC_BSWTRG	(3 << 30)	/* software trigger changes TIOB */
235 #define        ATMEL_TC_BSWTRG_NONE	(0 << 30)
236 #define        ATMEL_TC_BSWTRG_SET	(1 << 30)
237 #define        ATMEL_TC_BSWTRG_CLEAR	(2 << 30)
238 #define        ATMEL_TC_BSWTRG_TOGGLE	(3 << 30)
239 
240 #define ATMEL_TC_CV	0x10		/* counter Value */
241 #define ATMEL_TC_RA	0x14		/* register A */
242 #define ATMEL_TC_RB	0x18		/* register B */
243 #define ATMEL_TC_RC	0x1c		/* register C */
244 
245 #define ATMEL_TC_SR	0x20		/* status (read-only) */
246 /* Status-only flags */
247 #define     ATMEL_TC_CLKSTA	(1 << 16)	/* clock enabled */
248 #define     ATMEL_TC_MTIOA	(1 << 17)	/* TIOA mirror */
249 #define     ATMEL_TC_MTIOB	(1 << 18)	/* TIOB mirror */
250 
251 #define ATMEL_TC_IER	0x24		/* interrupt enable (write-only) */
252 #define ATMEL_TC_IDR	0x28		/* interrupt disable (write-only) */
253 #define ATMEL_TC_IMR	0x2c		/* interrupt mask (read-only) */
254 
255 /* Status and IRQ flags */
256 #define     ATMEL_TC_COVFS	(1 <<  0)	/* counter overflow */
257 #define     ATMEL_TC_LOVRS	(1 <<  1)	/* load overrun */
258 #define     ATMEL_TC_CPAS	(1 <<  2)	/* RA compare */
259 #define     ATMEL_TC_CPBS	(1 <<  3)	/* RB compare */
260 #define     ATMEL_TC_CPCS	(1 <<  4)	/* RC compare */
261 #define     ATMEL_TC_LDRAS	(1 <<  5)	/* RA loading */
262 #define     ATMEL_TC_LDRBS	(1 <<  6)	/* RB loading */
263 #define     ATMEL_TC_ETRGS	(1 <<  7)	/* external trigger */
264 #define     ATMEL_TC_ALL_IRQ	(ATMEL_TC_COVFS	| ATMEL_TC_LOVRS | \
265 				 ATMEL_TC_CPAS | ATMEL_TC_CPBS | \
266 				 ATMEL_TC_CPCS | ATMEL_TC_LDRAS | \
267 				 ATMEL_TC_LDRBS | ATMEL_TC_ETRGS) \
268 				 /* all IRQs */
269 
270 #endif
271