312 lines
7.2 KiB
C
312 lines
7.2 KiB
C
/*
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* gptimers.c - Blackfin General Purpose Timer core API
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*
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* Copyright (c) 2005-2008 Analog Devices Inc.
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* Copyright (C) 2005 John DeHority
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* Copyright (C) 2006 Hella Aglaia GmbH (awe@aglaia-gmbh.de)
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*
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* Licensed under the GPLv2.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <asm/blackfin.h>
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#include <asm/gptimers.h>
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#ifdef DEBUG
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# define tassert(expr)
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#else
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# define tassert(expr) \
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if (!(expr)) \
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printk(KERN_DEBUG "%s:%s:%i: Assertion failed: " #expr "\n", __FILE__, __func__, __LINE__);
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#endif
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#define BFIN_TIMER_NUM_GROUP (BFIN_TIMER_OCTET(MAX_BLACKFIN_GPTIMERS - 1) + 1)
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typedef struct {
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uint16_t config;
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uint16_t __pad;
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uint32_t counter;
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uint32_t period;
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uint32_t width;
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} GPTIMER_timer_regs;
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typedef struct {
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uint16_t enable;
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uint16_t __pad0;
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uint16_t disable;
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uint16_t __pad1;
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uint32_t status;
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} GPTIMER_group_regs;
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static volatile GPTIMER_timer_regs *const timer_regs[MAX_BLACKFIN_GPTIMERS] =
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{
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(GPTIMER_timer_regs *)TIMER0_CONFIG,
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(GPTIMER_timer_regs *)TIMER1_CONFIG,
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(GPTIMER_timer_regs *)TIMER2_CONFIG,
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#if (MAX_BLACKFIN_GPTIMERS > 3)
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(GPTIMER_timer_regs *)TIMER3_CONFIG,
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(GPTIMER_timer_regs *)TIMER4_CONFIG,
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(GPTIMER_timer_regs *)TIMER5_CONFIG,
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(GPTIMER_timer_regs *)TIMER6_CONFIG,
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(GPTIMER_timer_regs *)TIMER7_CONFIG,
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# if (MAX_BLACKFIN_GPTIMERS > 8)
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(GPTIMER_timer_regs *)TIMER8_CONFIG,
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(GPTIMER_timer_regs *)TIMER9_CONFIG,
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(GPTIMER_timer_regs *)TIMER10_CONFIG,
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# if (MAX_BLACKFIN_GPTIMERS > 11)
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(GPTIMER_timer_regs *)TIMER11_CONFIG,
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# endif
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# endif
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#endif
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};
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static volatile GPTIMER_group_regs *const group_regs[BFIN_TIMER_NUM_GROUP] =
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{
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(GPTIMER_group_regs *)TIMER0_GROUP_REG,
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#if (MAX_BLACKFIN_GPTIMERS > 8)
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(GPTIMER_group_regs *)TIMER8_GROUP_REG,
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#endif
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};
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static uint32_t const trun_mask[MAX_BLACKFIN_GPTIMERS] =
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{
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TIMER_STATUS_TRUN0,
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TIMER_STATUS_TRUN1,
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TIMER_STATUS_TRUN2,
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#if (MAX_BLACKFIN_GPTIMERS > 3)
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TIMER_STATUS_TRUN3,
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TIMER_STATUS_TRUN4,
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TIMER_STATUS_TRUN5,
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TIMER_STATUS_TRUN6,
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TIMER_STATUS_TRUN7,
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# if (MAX_BLACKFIN_GPTIMERS > 8)
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TIMER_STATUS_TRUN8,
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TIMER_STATUS_TRUN9,
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TIMER_STATUS_TRUN10,
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# if (MAX_BLACKFIN_GPTIMERS > 11)
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TIMER_STATUS_TRUN11,
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# endif
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# endif
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#endif
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};
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static uint32_t const tovf_mask[MAX_BLACKFIN_GPTIMERS] =
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{
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TIMER_STATUS_TOVF0,
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TIMER_STATUS_TOVF1,
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TIMER_STATUS_TOVF2,
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#if (MAX_BLACKFIN_GPTIMERS > 3)
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TIMER_STATUS_TOVF3,
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TIMER_STATUS_TOVF4,
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TIMER_STATUS_TOVF5,
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TIMER_STATUS_TOVF6,
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TIMER_STATUS_TOVF7,
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# if (MAX_BLACKFIN_GPTIMERS > 8)
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TIMER_STATUS_TOVF8,
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TIMER_STATUS_TOVF9,
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TIMER_STATUS_TOVF10,
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# if (MAX_BLACKFIN_GPTIMERS > 11)
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TIMER_STATUS_TOVF11,
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# endif
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# endif
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#endif
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};
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static uint32_t const timil_mask[MAX_BLACKFIN_GPTIMERS] =
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{
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TIMER_STATUS_TIMIL0,
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TIMER_STATUS_TIMIL1,
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TIMER_STATUS_TIMIL2,
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#if (MAX_BLACKFIN_GPTIMERS > 3)
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TIMER_STATUS_TIMIL3,
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TIMER_STATUS_TIMIL4,
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TIMER_STATUS_TIMIL5,
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TIMER_STATUS_TIMIL6,
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TIMER_STATUS_TIMIL7,
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# if (MAX_BLACKFIN_GPTIMERS > 8)
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TIMER_STATUS_TIMIL8,
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TIMER_STATUS_TIMIL9,
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TIMER_STATUS_TIMIL10,
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# if (MAX_BLACKFIN_GPTIMERS > 11)
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TIMER_STATUS_TIMIL11,
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# endif
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# endif
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#endif
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};
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void set_gptimer_pwidth(unsigned int timer_id, uint32_t value)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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timer_regs[timer_id]->width = value;
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SSYNC();
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}
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EXPORT_SYMBOL(set_gptimer_pwidth);
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uint32_t get_gptimer_pwidth(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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return timer_regs[timer_id]->width;
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}
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EXPORT_SYMBOL(get_gptimer_pwidth);
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void set_gptimer_period(unsigned int timer_id, uint32_t period)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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timer_regs[timer_id]->period = period;
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SSYNC();
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}
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EXPORT_SYMBOL(set_gptimer_period);
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uint32_t get_gptimer_period(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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return timer_regs[timer_id]->period;
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}
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EXPORT_SYMBOL(get_gptimer_period);
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uint32_t get_gptimer_count(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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return timer_regs[timer_id]->counter;
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}
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EXPORT_SYMBOL(get_gptimer_count);
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uint32_t get_gptimer_status(unsigned int group)
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{
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tassert(group < BFIN_TIMER_NUM_GROUP);
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return group_regs[group]->status;
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}
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EXPORT_SYMBOL(get_gptimer_status);
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void set_gptimer_status(unsigned int group, uint32_t value)
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{
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tassert(group < BFIN_TIMER_NUM_GROUP);
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group_regs[group]->status = value;
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SSYNC();
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}
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EXPORT_SYMBOL(set_gptimer_status);
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int get_gptimer_intr(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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return !!(group_regs[BFIN_TIMER_OCTET(timer_id)]->status & timil_mask[timer_id]);
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}
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EXPORT_SYMBOL(get_gptimer_intr);
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void clear_gptimer_intr(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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group_regs[BFIN_TIMER_OCTET(timer_id)]->status = timil_mask[timer_id];
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}
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EXPORT_SYMBOL(clear_gptimer_intr);
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int get_gptimer_over(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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return !!(group_regs[BFIN_TIMER_OCTET(timer_id)]->status & tovf_mask[timer_id]);
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}
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EXPORT_SYMBOL(get_gptimer_over);
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void clear_gptimer_over(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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group_regs[BFIN_TIMER_OCTET(timer_id)]->status = tovf_mask[timer_id];
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}
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EXPORT_SYMBOL(clear_gptimer_over);
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int get_gptimer_run(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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return !!(group_regs[BFIN_TIMER_OCTET(timer_id)]->status & trun_mask[timer_id]);
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}
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EXPORT_SYMBOL(get_gptimer_run);
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void set_gptimer_config(unsigned int timer_id, uint16_t config)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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timer_regs[timer_id]->config = config;
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SSYNC();
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}
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EXPORT_SYMBOL(set_gptimer_config);
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uint16_t get_gptimer_config(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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return timer_regs[timer_id]->config;
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}
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EXPORT_SYMBOL(get_gptimer_config);
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void enable_gptimers(uint16_t mask)
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{
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int i;
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tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
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for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
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group_regs[i]->enable = mask & 0xFF;
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mask >>= 8;
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}
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SSYNC();
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}
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EXPORT_SYMBOL(enable_gptimers);
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static void _disable_gptimers(uint16_t mask)
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{
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int i;
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uint16_t m = mask;
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tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
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for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
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group_regs[i]->disable = m & 0xFF;
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m >>= 8;
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}
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}
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void disable_gptimers(uint16_t mask)
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{
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int i;
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_disable_gptimers(mask);
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for (i = 0; i < MAX_BLACKFIN_GPTIMERS; ++i)
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if (mask & (1 << i))
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group_regs[BFIN_TIMER_OCTET(i)]->status |= trun_mask[i];
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SSYNC();
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}
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EXPORT_SYMBOL(disable_gptimers);
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void disable_gptimers_sync(uint16_t mask)
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{
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_disable_gptimers(mask);
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SSYNC();
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}
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EXPORT_SYMBOL(disable_gptimers_sync);
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void set_gptimer_pulse_hi(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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timer_regs[timer_id]->config |= TIMER_PULSE_HI;
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SSYNC();
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}
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EXPORT_SYMBOL(set_gptimer_pulse_hi);
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void clear_gptimer_pulse_hi(unsigned int timer_id)
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{
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tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
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timer_regs[timer_id]->config &= ~TIMER_PULSE_HI;
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SSYNC();
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}
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EXPORT_SYMBOL(clear_gptimer_pulse_hi);
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uint16_t get_enabled_gptimers(void)
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{
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int i;
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uint16_t result = 0;
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for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i)
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result |= (group_regs[i]->enable << (i << 3));
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return result;
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}
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EXPORT_SYMBOL(get_enabled_gptimers);
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MODULE_AUTHOR("Axel Weiss (awe@aglaia-gmbh.de)");
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MODULE_DESCRIPTION("Blackfin General Purpose Timers API");
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MODULE_LICENSE("GPL");
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