include/linux/atmel_tc.h

   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