From ff155a45cea56ad7a90c3f5192db59a4c7812fde Mon Sep 17 00:00:00 2001 From: Vasanthakumar Thiagarajan Date: Wed, 26 Aug 2009 21:08:49 +0530 Subject: [PATCH] ath9k: Add infrastructure for generic hw timers Signed-off-by: Vasanthakumar Thiagarajan Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/debug.h | 1 + drivers/net/wireless/ath/ath9k/hw.c | 212 +++++++++++++++++++++++++ drivers/net/wireless/ath/ath9k/hw.h | 52 ++++++ drivers/net/wireless/ath/ath9k/reg.h | 15 +- 4 files changed, 278 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h index 5e56b79d0cb0..ea0dd1ec15c3 100644 --- a/drivers/net/wireless/ath/ath9k/debug.h +++ b/drivers/net/wireless/ath/ath9k/debug.h @@ -30,6 +30,7 @@ enum ATH_DEBUG { ATH_DBG_CONFIG = 0x00000200, ATH_DBG_FATAL = 0x00000400, ATH_DBG_PS = 0x00000800, + ATH_DBG_HWTIMER = 0x00001000, ATH_DBG_ANY = 0xffffffff }; diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index c80be8c78e8b..3afd7a9fc8a3 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -3215,6 +3215,23 @@ bool ath9k_hw_getisr(struct ath_hw *ah, enum ath9k_int *masked) if (AR_SREV_9100(ah)) return true; + if (isr & AR_ISR_GENTMR) { + u32 s5_s; + + s5_s = REG_READ(ah, AR_ISR_S5_S); + if (isr & AR_ISR_GENTMR) { + ah->intr_gen_timer_trigger = + MS(s5_s, AR_ISR_S5_GENTIMER_TRIG); + + ah->intr_gen_timer_thresh = + MS(s5_s, AR_ISR_S5_GENTIMER_THRESH); + + if (ah->intr_gen_timer_trigger) + *masked |= ATH9K_INT_GENTIMER; + + } + } + if (sync_cause) { fatal_int = (sync_cause & @@ -4078,3 +4095,198 @@ void ath9k_hw_set11nmac2040(struct ath_hw *ah, enum ath9k_ht_macmode mode) REG_WRITE(ah, AR_2040_MODE, macmode); } + +/* HW Generic timers configuration */ + +static const struct ath_gen_timer_configuration gen_tmr_configuration[] = +{ + {AR_NEXT_NDP_TIMER, AR_NDP_PERIOD, AR_TIMER_MODE, 0x0080}, + {AR_NEXT_NDP_TIMER, AR_NDP_PERIOD, AR_TIMER_MODE, 0x0080}, + {AR_NEXT_NDP_TIMER, AR_NDP_PERIOD, AR_TIMER_MODE, 0x0080}, + {AR_NEXT_NDP_TIMER, AR_NDP_PERIOD, AR_TIMER_MODE, 0x0080}, + {AR_NEXT_NDP_TIMER, AR_NDP_PERIOD, AR_TIMER_MODE, 0x0080}, + {AR_NEXT_NDP_TIMER, AR_NDP_PERIOD, AR_TIMER_MODE, 0x0080}, + {AR_NEXT_NDP_TIMER, AR_NDP_PERIOD, AR_TIMER_MODE, 0x0080}, + {AR_NEXT_NDP_TIMER, AR_NDP_PERIOD, AR_TIMER_MODE, 0x0080}, + {AR_NEXT_NDP2_TIMER, AR_NDP2_PERIOD, AR_NDP2_TIMER_MODE, 0x0001}, + {AR_NEXT_NDP2_TIMER + 1*4, AR_NDP2_PERIOD + 1*4, + AR_NDP2_TIMER_MODE, 0x0002}, + {AR_NEXT_NDP2_TIMER + 2*4, AR_NDP2_PERIOD + 2*4, + AR_NDP2_TIMER_MODE, 0x0004}, + {AR_NEXT_NDP2_TIMER + 3*4, AR_NDP2_PERIOD + 3*4, + AR_NDP2_TIMER_MODE, 0x0008}, + {AR_NEXT_NDP2_TIMER + 4*4, AR_NDP2_PERIOD + 4*4, + AR_NDP2_TIMER_MODE, 0x0010}, + {AR_NEXT_NDP2_TIMER + 5*4, AR_NDP2_PERIOD + 5*4, + AR_NDP2_TIMER_MODE, 0x0020}, + {AR_NEXT_NDP2_TIMER + 6*4, AR_NDP2_PERIOD + 6*4, + AR_NDP2_TIMER_MODE, 0x0040}, + {AR_NEXT_NDP2_TIMER + 7*4, AR_NDP2_PERIOD + 7*4, + AR_NDP2_TIMER_MODE, 0x0080} +}; + +/* HW generic timer primitives */ + +/* compute and clear index of rightmost 1 */ +static u32 rightmost_index(struct ath_gen_timer_table *timer_table, u32 *mask) +{ + u32 b; + + b = *mask; + b &= (0-b); + *mask &= ~b; + b *= debruijn32; + b >>= 27; + + return timer_table->gen_timer_index[b]; +} + +static u32 ath9k_hw_gettsf32(struct ath_hw *ah) +{ + return REG_READ(ah, AR_TSF_L32); +} + +struct ath_gen_timer *ath_gen_timer_alloc(struct ath_hw *ah, + void (*trigger)(void *), + void (*overflow)(void *), + void *arg, + u8 timer_index) +{ + struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers; + struct ath_gen_timer *timer; + + timer = kzalloc(sizeof(struct ath_gen_timer), GFP_KERNEL); + + if (timer == NULL) { + printk(KERN_DEBUG "Failed to allocate memory" + "for hw timer[%d]\n", timer_index); + return NULL; + } + + /* allocate a hardware generic timer slot */ + timer_table->timers[timer_index] = timer; + timer->index = timer_index; + timer->trigger = trigger; + timer->overflow = overflow; + timer->arg = arg; + + return timer; +} + +void ath_gen_timer_start(struct ath_hw *ah, + struct ath_gen_timer *timer, + u32 timer_next, u32 timer_period) +{ + struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers; + u32 tsf; + + BUG_ON(!timer_period); + + set_bit(timer->index, &timer_table->timer_mask.timer_bits); + + tsf = ath9k_hw_gettsf32(ah); + + DPRINTF(ah->ah_sc, ATH_DBG_HWTIMER, "curent tsf %x period %x" + "timer_next %x\n", tsf, timer_period, timer_next); + + /* + * Pull timer_next forward if the current TSF already passed it + * because of software latency + */ + if (timer_next < tsf) + timer_next = tsf + timer_period; + + /* + * Program generic timer registers + */ + REG_WRITE(ah, gen_tmr_configuration[timer->index].next_addr, + timer_next); + REG_WRITE(ah, gen_tmr_configuration[timer->index].period_addr, + timer_period); + REG_SET_BIT(ah, gen_tmr_configuration[timer->index].mode_addr, + gen_tmr_configuration[timer->index].mode_mask); + + /* Enable both trigger and thresh interrupt masks */ + REG_SET_BIT(ah, AR_IMR_S5, + (SM(AR_GENTMR_BIT(timer->index), AR_IMR_S5_GENTIMER_THRESH) | + SM(AR_GENTMR_BIT(timer->index), AR_IMR_S5_GENTIMER_TRIG))); + + if ((ah->ah_sc->imask & ATH9K_INT_GENTIMER) == 0) { + ath9k_hw_set_interrupts(ah, 0); + ah->ah_sc->imask |= ATH9K_INT_GENTIMER; + ath9k_hw_set_interrupts(ah, ah->ah_sc->imask); + } +} + +void ath_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer) +{ + struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers; + + if ((timer->index < AR_FIRST_NDP_TIMER) || + (timer->index >= ATH_MAX_GEN_TIMER)) { + return; + } + + /* Clear generic timer enable bits. */ + REG_CLR_BIT(ah, gen_tmr_configuration[timer->index].mode_addr, + gen_tmr_configuration[timer->index].mode_mask); + + /* Disable both trigger and thresh interrupt masks */ + REG_CLR_BIT(ah, AR_IMR_S5, + (SM(AR_GENTMR_BIT(timer->index), AR_IMR_S5_GENTIMER_THRESH) | + SM(AR_GENTMR_BIT(timer->index), AR_IMR_S5_GENTIMER_TRIG))); + + clear_bit(timer->index, &timer_table->timer_mask.timer_bits); + + /* if no timer is enabled, turn off interrupt mask */ + if (timer_table->timer_mask.val == 0) { + ath9k_hw_set_interrupts(ah, 0); + ah->ah_sc->imask &= ~ATH9K_INT_GENTIMER; + ath9k_hw_set_interrupts(ah, ah->ah_sc->imask); + } +} + +void ath_gen_timer_free(struct ath_hw *ah, struct ath_gen_timer *timer) +{ + struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers; + + /* free the hardware generic timer slot */ + timer_table->timers[timer->index] = NULL; + kfree(timer); +} + +/* + * Generic Timer Interrupts handling + */ +void ath_gen_timer_isr(struct ath_hw *ah) +{ + struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers; + struct ath_gen_timer *timer; + u32 trigger_mask, thresh_mask, index; + + /* get hardware generic timer interrupt status */ + trigger_mask = ah->intr_gen_timer_trigger; + thresh_mask = ah->intr_gen_timer_thresh; + trigger_mask &= timer_table->timer_mask.val; + thresh_mask &= timer_table->timer_mask.val; + + trigger_mask &= ~thresh_mask; + + while (thresh_mask) { + index = rightmost_index(timer_table, &thresh_mask); + timer = timer_table->timers[index]; + BUG_ON(!timer); + DPRINTF(ah->ah_sc, ATH_DBG_HWTIMER, + "TSF overflow for Gen timer %d\n", index); + timer->overflow(timer->arg); + } + + while (trigger_mask) { + index = rightmost_index(timer_table, &trigger_mask); + timer = timer_table->timers[index]; + BUG_ON(!timer); + DPRINTF(ah->ah_sc, ATH_DBG_HWTIMER, + "Gen timer[%d] trigger\n", index); + timer->trigger(timer->arg); + } +} diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h index de10de8370d2..052a9c4ebb92 100644 --- a/drivers/net/wireless/ath/ath9k/hw.h +++ b/drivers/net/wireless/ath/ath9k/hw.h @@ -237,6 +237,7 @@ enum ath9k_int { ATH9K_INT_GPIO = 0x01000000, ATH9K_INT_CABEND = 0x02000000, ATH9K_INT_TSFOOR = 0x04000000, + ATH9K_INT_GENTIMER = 0x08000000, ATH9K_INT_CST = 0x10000000, ATH9K_INT_GTT = 0x20000000, ATH9K_INT_FATAL = 0x40000000, @@ -390,6 +391,41 @@ struct ath9k_hw_version { u16 analog2GhzRev; }; +/* Generic TSF timer definitions */ + +#define ATH_MAX_GEN_TIMER 16 + +#define AR_GENTMR_BIT(_index) (1 << (_index)) + +/* + * Using de Bruijin sequence to to look up 1's index in a 32 bit number + * debruijn32 = 0000 0111 0111 1100 1011 0101 0011 0001 + */ +#define debruijn32 0x077CB531UL + +struct ath_gen_timer_configuration { + u32 next_addr; + u32 period_addr; + u32 mode_addr; + u32 mode_mask; +}; + +struct ath_gen_timer { + void (*trigger)(void *arg); + void (*overflow)(void *arg); + void *arg; + u8 index; +}; + +struct ath_gen_timer_table { + u32 gen_timer_index[32]; + struct ath_gen_timer *timers[ATH_MAX_GEN_TIMER]; + union { + unsigned long timer_bits; + u16 val; + } timer_mask; +}; + struct ath_hw { struct ath_softc *ah_sc; struct ath9k_hw_version hw_version; @@ -536,6 +572,10 @@ struct ath_hw { struct ar5416IniArray iniModesAdditional; struct ar5416IniArray iniModesRxGain; struct ar5416IniArray iniModesTxGain; + + u32 intr_gen_timer_trigger; + u32 intr_gen_timer_thresh; + struct ath_gen_timer_table hw_gen_timers; }; /* Initialization, Detach, Reset */ @@ -611,4 +651,16 @@ bool ath9k_hw_intrpend(struct ath_hw *ah); bool ath9k_hw_getisr(struct ath_hw *ah, enum ath9k_int *masked); enum ath9k_int ath9k_hw_set_interrupts(struct ath_hw *ah, enum ath9k_int ints); +/* Generic hw timer primitives */ +struct ath_gen_timer *ath_gen_timer_alloc(struct ath_hw *ah, + void (*trigger)(void *), + void (*overflow)(void *), + void *arg, + u8 timer_index); +void ath_gen_timer_start(struct ath_hw *ah, struct ath_gen_timer *timer, + u32 timer_next, u32 timer_period); +void ath_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer); +void ath_gen_timer_free(struct ath_hw *ah, struct ath_gen_timer *timer); +void ath_gen_timer_isr(struct ath_hw *hw); + #endif diff --git a/drivers/net/wireless/ath/ath9k/reg.h b/drivers/net/wireless/ath/ath9k/reg.h index c9e1ac92d0e9..1d8e0a8b587c 100644 --- a/drivers/net/wireless/ath/ath9k/reg.h +++ b/drivers/net/wireless/ath/ath9k/reg.h @@ -234,7 +234,15 @@ #define AR_IMR_S5 0x00b8 #define AR_IMR_S5_TIM_TIMER 0x00000010 #define AR_IMR_S5_DTIM_TIMER 0x00000020 - +#define AR_ISR_S5_GENTIMER_TRIG 0x0000FF80 +#define AR_ISR_S5_GENTIMER_TRIG_S 0 +#define AR_ISR_S5_GENTIMER_THRESH 0xFF800000 +#define AR_ISR_S5_GENTIMER_THRESH_S 16 +#define AR_ISR_S5_S 0x00d8 +#define AR_IMR_S5_GENTIMER_TRIG 0x0000FF80 +#define AR_IMR_S5_GENTIMER_TRIG_S 0 +#define AR_IMR_S5_GENTIMER_THRESH 0xFF800000 +#define AR_IMR_S5_GENTIMER_THRESH_S 16 #define AR_IMR 0x00a0 #define AR_IMR_RXOK 0x00000001 @@ -1516,7 +1524,10 @@ enum { #define AR_TXOP_8_11 0x81f8 #define AR_TXOP_12_15 0x81fc - +#define AR_NEXT_NDP2_TIMER 0x8180 +#define AR_FIRST_NDP_TIMER 7 +#define AR_NDP2_PERIOD 0x81a0 +#define AR_NDP2_TIMER_MODE 0x81c0 #define AR_NEXT_TBTT_TIMER 0x8200 #define AR_NEXT_DMA_BEACON_ALERT 0x8204 #define AR_NEXT_SWBA 0x8208 -- 2.30.2