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linux/arch/blackfin/kernel/gptimers.c
Mike Frysinger 8c0b4351cc Blackfin: gptimers: use unsigned timer/group ids 
Since we always use these ids as unsigned values, and we have some assert
code to make sure they don't exceed a limit, avoid signed issues.

Reported-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-12-15 00:15:30 -05:00

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