diff options
Diffstat (limited to 'arch/blackfin/kernel/gptimers.c')
| -rw-r--r-- | arch/blackfin/kernel/gptimers.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/gptimers.c b/arch/blackfin/kernel/gptimers.c new file mode 100644 index 00000000000..cb7ba9bfc79 --- /dev/null +++ b/arch/blackfin/kernel/gptimers.c @@ -0,0 +1,250 @@ +/* + * bfin_gptimers.c - derived from bf53x_timers.c + * Driver for General Purpose Timer functions on the Blackfin processor + * + * 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 <asm/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, +#endif +#if (MAX_BLACKFIN_GPTIMERS > 8) + (GPTIMER_timer_regs *)TIMER8_CONFIG, + (GPTIMER_timer_regs *)TIMER9_CONFIG, + (GPTIMER_timer_regs *)TIMER10_CONFIG, + (GPTIMER_timer_regs *)TIMER11_CONFIG, +#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 dis_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, +#endif +#if (MAX_BLACKFIN_GPTIMERS > 8) + TIMER_STATUS_TRUN8, + TIMER_STATUS_TRUN9, + TIMER_STATUS_TRUN10, + TIMER_STATUS_TRUN11, +#endif +}; + +static uint32_t const irq_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, +#endif +#if (MAX_BLACKFIN_GPTIMERS > 8) + TIMER_STATUS_TIMIL8, + TIMER_STATUS_TIMIL9, + TIMER_STATUS_TIMIL10, + TIMER_STATUS_TIMIL11, +#endif +}; + +void set_gptimer_pwidth(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(int timer_id) +{ + tassert(timer_id < MAX_BLACKFIN_GPTIMERS); + return timer_regs[timer_id]->width; +} +EXPORT_SYMBOL(get_gptimer_pwidth); + +void set_gptimer_period(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(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(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(int group) +{ + tassert(group < BFIN_TIMER_NUM_GROUP); + return group_regs[group]->status; +} +EXPORT_SYMBOL(get_gptimer_status); + +void set_gptimer_status(int group, uint32_t value) +{ + tassert(group < BFIN_TIMER_NUM_GROUP); + group_regs[group]->status = value; + SSYNC(); +} +EXPORT_SYMBOL(set_gptimer_status); + +uint16_t get_gptimer_intr(int timer_id) +{ + tassert(timer_id < MAX_BLACKFIN_GPTIMERS); + return (group_regs[BFIN_TIMER_OCTET(timer_id)]->status & irq_mask[timer_id]) ? 1 : 0; +} +EXPORT_SYMBOL(get_gptimer_intr); + +void clear_gptimer_intr(int timer_id) +{ + tassert(timer_id < MAX_BLACKFIN_GPTIMERS); + group_regs[BFIN_TIMER_OCTET(timer_id)]->status = irq_mask[timer_id]; +} +EXPORT_SYMBOL(clear_gptimer_intr); + +void set_gptimer_config(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(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); + +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; + } + for (i = 0; i < MAX_BLACKFIN_GPTIMERS; ++i) + if (mask & (1 << i)) + group_regs[BFIN_TIMER_OCTET(i)]->status |= dis_mask[i]; + SSYNC(); +} +EXPORT_SYMBOL(disable_gptimers); + +void set_gptimer_pulse_hi(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(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"); |