| /* |
| * Timer/Counter Unit (TC) registers. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| #ifndef ATMEL_TC_H |
| #define ATMEL_TC_H |
| |
| #include <linux/compiler.h> |
| #include <linux/list.h> |
| |
| /* |
| * Many 32-bit Atmel SOCs include one or more TC blocks, each of which holds |
| * three general-purpose 16-bit timers. These timers share one register bank. |
| * Depending on the SOC, each timer may have its own clock and IRQ, or those |
| * may be shared by the whole TC block. |
| * |
| * These TC blocks may have up to nine external pins: TCLK0..2 signals for |
| * clocks or clock gates, and per-timer TIOA and TIOB signals used for PWM |
| * or triggering. Those pins need to be set up for use with the TC block, |
| * else they will be used as GPIOs or for a different controller. |
| * |
| * Although we expect each TC block to have a platform_device node, those |
| * nodes are not what drivers bind to. Instead, they ask for a specific |
| * TC block, by number ... which is a common approach on systems with many |
| * timers. Then they use clk_get() and platform_get_irq() to get clock and |
| * IRQ resources. |
| */ |
| |
| struct clk; |
| |
| /** |
| * struct atmel_tcb_config - SoC data for a Timer/Counter Block |
| * @counter_width: size in bits of a timer counter register |
| */ |
| struct atmel_tcb_config { |
| size_t counter_width; |
| }; |
| |
| /** |
| * struct atmel_tc - information about a Timer/Counter Block |
| * @pdev: physical device |
| * @regs: mapping through which the I/O registers can be accessed |
| * @id: block id |
| * @tcb_config: configuration data from SoC |
| * @irq: irq for each of the three channels |
| * @clk: internal clock source for each of the three channels |
| * @node: list node, for tclib internal use |
| * @allocated: if already used, for tclib internal use |
| * |
| * On some platforms, each TC channel has its own clocks and IRQs, |
| * while on others, all TC channels share the same clock and IRQ. |
| * Drivers should clk_enable() all the clocks they need even though |
| * all the entries in @clk may point to the same physical clock. |
| * Likewise, drivers should request irqs independently for each |
| * channel, but they must use IRQF_SHARED in case some of the entries |
| * in @irq are actually the same IRQ. |
| */ |
| struct atmel_tc { |
| struct platform_device *pdev; |
| void __iomem *regs; |
| int id; |
| const struct atmel_tcb_config *tcb_config; |
| int irq[3]; |
| struct clk *clk[3]; |
| struct list_head node; |
| bool allocated; |
| }; |
| |
| extern struct atmel_tc *atmel_tc_alloc(unsigned block); |
| extern void atmel_tc_free(struct atmel_tc *tc); |
| |
| /* platform-specific ATMEL_TC_TIMER_CLOCKx divisors (0 means 32KiHz) */ |
| extern const u8 atmel_tc_divisors[5]; |
| |
| |
| /* |
| * Two registers have block-wide controls. These are: configuring the three |
| * "external" clocks (or event sources) used by the timer channels; and |
| * synchronizing the timers by resetting them all at once. |
| * |
| * "External" can mean "external to chip" using the TCLK0, TCLK1, or TCLK2 |
| * signals. Or, it can mean "external to timer", using the TIOA output from |
| * one of the other two timers that's being run in waveform mode. |
| */ |
| |
| #define ATMEL_TC_BCR 0xc0 /* TC Block Control Register */ |
| #define ATMEL_TC_SYNC (1 << 0) /* synchronize timers */ |
| |
| #define ATMEL_TC_BMR 0xc4 /* TC Block Mode Register */ |
| #define ATMEL_TC_TC0XC0S (3 << 0) /* external clock 0 source */ |
| #define ATMEL_TC_TC0XC0S_TCLK0 (0 << 0) |
| #define ATMEL_TC_TC0XC0S_NONE (1 << 0) |
| #define ATMEL_TC_TC0XC0S_TIOA1 (2 << 0) |
| #define ATMEL_TC_TC0XC0S_TIOA2 (3 << 0) |
| #define ATMEL_TC_TC1XC1S (3 << 2) /* external clock 1 source */ |
| #define ATMEL_TC_TC1XC1S_TCLK1 (0 << 2) |
| #define ATMEL_TC_TC1XC1S_NONE (1 << 2) |
| #define ATMEL_TC_TC1XC1S_TIOA0 (2 << 2) |
| #define ATMEL_TC_TC1XC1S_TIOA2 (3 << 2) |
| #define ATMEL_TC_TC2XC2S (3 << 4) /* external clock 2 source */ |
| #define ATMEL_TC_TC2XC2S_TCLK2 (0 << 4) |
| #define ATMEL_TC_TC2XC2S_NONE (1 << 4) |
| #define ATMEL_TC_TC2XC2S_TIOA0 (2 << 4) |
| #define ATMEL_TC_TC2XC2S_TIOA1 (3 << 4) |
| |
| |
| /* |
| * Each TC block has three "channels", each with one counter and controls. |
| * |
| * Note that the semantics of ATMEL_TC_TIMER_CLOCKx (input clock selection |
| * when it's not "external") is silicon-specific. AT91 platforms use one |
| * set of definitions; AVR32 platforms use a different set. Don't hard-wire |
| * such knowledge into your code, use the global "atmel_tc_divisors" ... |
| * where index N is the divisor for clock N+1, else zero to indicate it uses |
| * the 32 KiHz clock. |
| * |
| * The timers can be chained in various ways, and operated in "waveform" |
| * generation mode (including PWM) or "capture" mode (to time events). In |
| * both modes, behavior can be configured in many ways. |
| * |
| * Each timer has two I/O pins, TIOA and TIOB. Waveform mode uses TIOA as a |
| * PWM output, and TIOB as either another PWM or as a trigger. Capture mode |
| * uses them only as inputs. |
| */ |
| #define ATMEL_TC_CHAN(idx) ((idx)*0x40) |
| #define ATMEL_TC_REG(idx, reg) (ATMEL_TC_CHAN(idx) + ATMEL_TC_ ## reg) |
| |
| #define ATMEL_TC_CCR 0x00 /* Channel Control Register */ |
| #define ATMEL_TC_CLKEN (1 << 0) /* clock enable */ |
| #define ATMEL_TC_CLKDIS (1 << 1) /* clock disable */ |
| #define ATMEL_TC_SWTRG (1 << 2) /* software trigger */ |
| |
| #define ATMEL_TC_CMR 0x04 /* Channel Mode Register */ |
| |
| /* Both modes share some CMR bits */ |
| #define ATMEL_TC_TCCLKS (7 << 0) /* clock source */ |
| #define ATMEL_TC_TIMER_CLOCK1 (0 << 0) |
| #define ATMEL_TC_TIMER_CLOCK2 (1 << 0) |
| #define ATMEL_TC_TIMER_CLOCK3 (2 << 0) |
| #define ATMEL_TC_TIMER_CLOCK4 (3 << 0) |
| #define ATMEL_TC_TIMER_CLOCK5 (4 << 0) |
| #define ATMEL_TC_XC0 (5 << 0) |
| #define ATMEL_TC_XC1 (6 << 0) |
| #define ATMEL_TC_XC2 (7 << 0) |
| #define ATMEL_TC_CLKI (1 << 3) /* clock invert */ |
| #define ATMEL_TC_BURST (3 << 4) /* clock gating */ |
| #define ATMEL_TC_GATE_NONE (0 << 4) |
| #define ATMEL_TC_GATE_XC0 (1 << 4) |
| #define ATMEL_TC_GATE_XC1 (2 << 4) |
| #define ATMEL_TC_GATE_XC2 (3 << 4) |
| #define ATMEL_TC_WAVE (1 << 15) /* true = Waveform mode */ |
| |
| /* CAPTURE mode CMR bits */ |
| #define ATMEL_TC_LDBSTOP (1 << 6) /* counter stops on RB load */ |
| #define ATMEL_TC_LDBDIS (1 << 7) /* counter disable on RB load */ |
| #define ATMEL_TC_ETRGEDG (3 << 8) /* external trigger edge */ |
| #define ATMEL_TC_ETRGEDG_NONE (0 << 8) |
| #define ATMEL_TC_ETRGEDG_RISING (1 << 8) |
| #define ATMEL_TC_ETRGEDG_FALLING (2 << 8) |
| #define ATMEL_TC_ETRGEDG_BOTH (3 << 8) |
| #define ATMEL_TC_ABETRG (1 << 10) /* external trigger is TIOA? */ |
| #define ATMEL_TC_CPCTRG (1 << 14) /* RC compare trigger enable */ |
| #define ATMEL_TC_LDRA (3 << 16) /* RA loading edge (of TIOA) */ |
| #define ATMEL_TC_LDRA_NONE (0 << 16) |
| #define ATMEL_TC_LDRA_RISING (1 << 16) |
| #define ATMEL_TC_LDRA_FALLING (2 << 16) |
| #define ATMEL_TC_LDRA_BOTH (3 << 16) |
| #define ATMEL_TC_LDRB (3 << 18) /* RB loading edge (of TIOA) */ |
| #define ATMEL_TC_LDRB_NONE (0 << 18) |
| #define ATMEL_TC_LDRB_RISING (1 << 18) |
| #define ATMEL_TC_LDRB_FALLING (2 << 18) |
| #define ATMEL_TC_LDRB_BOTH (3 << 18) |
| |
| /* WAVEFORM mode CMR bits */ |
| #define ATMEL_TC_CPCSTOP (1 << 6) /* RC compare stops counter */ |
| #define ATMEL_TC_CPCDIS (1 << 7) /* RC compare disables counter */ |
| #define ATMEL_TC_EEVTEDG (3 << 8) /* external event edge */ |
| #define ATMEL_TC_EEVTEDG_NONE (0 << 8) |
| #define ATMEL_TC_EEVTEDG_RISING (1 << 8) |
| #define ATMEL_TC_EEVTEDG_FALLING (2 << 8) |
| #define ATMEL_TC_EEVTEDG_BOTH (3 << 8) |
| #define ATMEL_TC_EEVT (3 << 10) /* external event source */ |
| #define ATMEL_TC_EEVT_TIOB (0 << 10) |
| #define ATMEL_TC_EEVT_XC0 (1 << 10) |
| #define ATMEL_TC_EEVT_XC1 (2 << 10) |
| #define ATMEL_TC_EEVT_XC2 (3 << 10) |
| #define ATMEL_TC_ENETRG (1 << 12) /* external event is trigger */ |
| #define ATMEL_TC_WAVESEL (3 << 13) /* waveform type */ |
| #define ATMEL_TC_WAVESEL_UP (0 << 13) |
| #define ATMEL_TC_WAVESEL_UPDOWN (1 << 13) |
| #define ATMEL_TC_WAVESEL_UP_AUTO (2 << 13) |
| #define ATMEL_TC_WAVESEL_UPDOWN_AUTO (3 << 13) |
| #define ATMEL_TC_ACPA (3 << 16) /* RA compare changes TIOA */ |
| #define ATMEL_TC_ACPA_NONE (0 << 16) |
| #define ATMEL_TC_ACPA_SET (1 << 16) |
| #define ATMEL_TC_ACPA_CLEAR (2 << 16) |
| #define ATMEL_TC_ACPA_TOGGLE (3 << 16) |
| #define ATMEL_TC_ACPC (3 << 18) /* RC compare changes TIOA */ |
| #define ATMEL_TC_ACPC_NONE (0 << 18) |
| #define ATMEL_TC_ACPC_SET (1 << 18) |
| #define ATMEL_TC_ACPC_CLEAR (2 << 18) |
| #define ATMEL_TC_ACPC_TOGGLE (3 << 18) |
| #define ATMEL_TC_AEEVT (3 << 20) /* external event changes TIOA */ |
| #define ATMEL_TC_AEEVT_NONE (0 << 20) |
| #define ATMEL_TC_AEEVT_SET (1 << 20) |
| #define ATMEL_TC_AEEVT_CLEAR (2 << 20) |
| #define ATMEL_TC_AEEVT_TOGGLE (3 << 20) |
| #define ATMEL_TC_ASWTRG (3 << 22) /* software trigger changes TIOA */ |
| #define ATMEL_TC_ASWTRG_NONE (0 << 22) |
| #define ATMEL_TC_ASWTRG_SET (1 << 22) |
| #define ATMEL_TC_ASWTRG_CLEAR (2 << 22) |
| #define ATMEL_TC_ASWTRG_TOGGLE (3 << 22) |
| #define ATMEL_TC_BCPB (3 << 24) /* RB compare changes TIOB */ |
| #define ATMEL_TC_BCPB_NONE (0 << 24) |
| #define ATMEL_TC_BCPB_SET (1 << 24) |
| #define ATMEL_TC_BCPB_CLEAR (2 << 24) |
| #define ATMEL_TC_BCPB_TOGGLE (3 << 24) |
| #define ATMEL_TC_BCPC (3 << 26) /* RC compare changes TIOB */ |
| #define ATMEL_TC_BCPC_NONE (0 << 26) |
| #define ATMEL_TC_BCPC_SET (1 << 26) |
| #define ATMEL_TC_BCPC_CLEAR (2 << 26) |
| #define ATMEL_TC_BCPC_TOGGLE (3 << 26) |
| #define ATMEL_TC_BEEVT (3 << 28) /* external event changes TIOB */ |
| #define ATMEL_TC_BEEVT_NONE (0 << 28) |
| #define ATMEL_TC_BEEVT_SET (1 << 28) |
| #define ATMEL_TC_BEEVT_CLEAR (2 << 28) |
| #define ATMEL_TC_BEEVT_TOGGLE (3 << 28) |
| #define ATMEL_TC_BSWTRG (3 << 30) /* software trigger changes TIOB */ |
| #define ATMEL_TC_BSWTRG_NONE (0 << 30) |
| #define ATMEL_TC_BSWTRG_SET (1 << 30) |
| #define ATMEL_TC_BSWTRG_CLEAR (2 << 30) |
| #define ATMEL_TC_BSWTRG_TOGGLE (3 << 30) |
| |
| #define ATMEL_TC_CV 0x10 /* counter Value */ |
| #define ATMEL_TC_RA 0x14 /* register A */ |
| #define ATMEL_TC_RB 0x18 /* register B */ |
| #define ATMEL_TC_RC 0x1c /* register C */ |
| |
| #define ATMEL_TC_SR 0x20 /* status (read-only) */ |
| /* Status-only flags */ |
| #define ATMEL_TC_CLKSTA (1 << 16) /* clock enabled */ |
| #define ATMEL_TC_MTIOA (1 << 17) /* TIOA mirror */ |
| #define ATMEL_TC_MTIOB (1 << 18) /* TIOB mirror */ |
| |
| #define ATMEL_TC_IER 0x24 /* interrupt enable (write-only) */ |
| #define ATMEL_TC_IDR 0x28 /* interrupt disable (write-only) */ |
| #define ATMEL_TC_IMR 0x2c /* interrupt mask (read-only) */ |
| |
| /* Status and IRQ flags */ |
| #define ATMEL_TC_COVFS (1 << 0) /* counter overflow */ |
| #define ATMEL_TC_LOVRS (1 << 1) /* load overrun */ |
| #define ATMEL_TC_CPAS (1 << 2) /* RA compare */ |
| #define ATMEL_TC_CPBS (1 << 3) /* RB compare */ |
| #define ATMEL_TC_CPCS (1 << 4) /* RC compare */ |
| #define ATMEL_TC_LDRAS (1 << 5) /* RA loading */ |
| #define ATMEL_TC_LDRBS (1 << 6) /* RB loading */ |
| #define ATMEL_TC_ETRGS (1 << 7) /* external trigger */ |
| #define ATMEL_TC_ALL_IRQ (ATMEL_TC_COVFS | ATMEL_TC_LOVRS | \ |
| ATMEL_TC_CPAS | ATMEL_TC_CPBS | \ |
| ATMEL_TC_CPCS | ATMEL_TC_LDRAS | \ |
| ATMEL_TC_LDRBS | ATMEL_TC_ETRGS) \ |
| /* all IRQs */ |
| |
| #endif |
