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Tue, 24 Aug 2021 06:14:50 -0400 (EDT) To: Mark Cave-Ayland , David Gibson , Greg Kurz Message-Id: <45c9d15c51076bba431e5593dbfcbcca2e1dc09a.1629799776.git.fthain@linux-m68k.org> In-Reply-To: References: From: Finn Thain Subject: [RFC 06/10] hw/mos6522: Implement oneshot mode Date: Tue, 24 Aug 2021 20:09:36 +1000 Received-SPF: none client-ip=64.147.123.25; envelope-from=fthain@linux-m68k.org; helo=wout2-smtp.messagingengine.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-ppc@nongnu.org, Laurent Vivier , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Finn Thain --- hw/misc/mos6522.c | 19 ++++++++++++------- include/hw/misc/mos6522.h | 3 +++ 2 files changed, 15 insertions(+), 7 deletions(-) diff --git a/hw/misc/mos6522.c b/hw/misc/mos6522.c index ffff8991f4..5b1657ac0d 100644 --- a/hw/misc/mos6522.c +++ b/hw/misc/mos6522.c @@ -79,6 +79,7 @@ static void set_counter(MOS6522State *s, MOS6522Timer *ti, unsigned int val) trace_mos6522_set_counter(1 + ti->index, val); ti->load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); ti->counter_value = val; + ti->oneshot_fired = false; if (ti->index == 0) { mos6522_timer1_update(s, ti, ti->load_time); } else { @@ -133,7 +134,8 @@ static void mos6522_timer1_update(MOS6522State *s, MOS6522Timer *ti, return; } ti->next_irq_time = get_next_irq_time(s, ti, current_time); - if ((s->ier & T1_INT) == 0 || (s->acr & T1MODE) != T1MODE_CONT) { + if ((s->ier & T1_INT) == 0 || + ((s->acr & T1MODE) == T1MODE_ONESHOT && ti->oneshot_fired)) { timer_del(ti->timer); } else { timer_mod(ti->timer, ti->next_irq_time); @@ -147,7 +149,7 @@ static void mos6522_timer2_update(MOS6522State *s, MOS6522Timer *ti, return; } ti->next_irq_time = get_next_irq_time(s, ti, current_time); - if ((s->ier & T2_INT) == 0) { + if ((s->ier & T2_INT) == 0 || (s->acr & T2MODE) || ti->oneshot_fired) { timer_del(ti->timer); } else { timer_mod(ti->timer, ti->next_irq_time); @@ -159,6 +161,7 @@ static void mos6522_timer1_expired(void *opaque) MOS6522State *s = opaque; MOS6522Timer *ti = &s->timers[0]; + ti->oneshot_fired = true; mos6522_timer1_update(s, ti, ti->next_irq_time); s->ifr |= T1_INT; mos6522_update_irq(s); @@ -169,6 +172,7 @@ static void mos6522_timer2_expired(void *opaque) MOS6522State *s = opaque; MOS6522Timer *ti = &s->timers[1]; + ti->oneshot_fired = true; mos6522_timer2_update(s, ti, ti->next_irq_time); s->ifr |= T2_INT; mos6522_update_irq(s); @@ -198,10 +202,12 @@ uint64_t mos6522_read(void *opaque, hwaddr addr, unsigned size) int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); if (now >= s->timers[0].next_irq_time) { + s->timers[0].oneshot_fired = true; mos6522_timer1_update(s, &s->timers[0], now); s->ifr |= T1_INT; } if (now >= s->timers[1].next_irq_time) { + s->timers[1].oneshot_fired = true; mos6522_timer2_update(s, &s->timers[1], now); s->ifr |= T2_INT; } @@ -279,6 +285,7 @@ void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) { MOS6522State *s = opaque; MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s); + int64_t now; trace_mos6522_write(addr, val); @@ -318,9 +325,6 @@ void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) s->timers[1].latch = (s->timers[1].latch & 0xff00) | val; break; case VIA_REG_T2CH: - /* To ensure T2 generates an interrupt on zero crossing with the - common timer code, write the value directly from the latch to - the counter */ s->timers[1].latch = (s->timers[1].latch & 0xff) | (val << 8); s->ifr &= ~T2_INT; set_counter(s, &s->timers[1], s->timers[1].latch); @@ -330,8 +334,9 @@ void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) break; case VIA_REG_ACR: s->acr = val; - mos6522_timer1_update(s, &s->timers[0], - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); + now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + mos6522_timer1_update(s, &s->timers[0], now); + mos6522_timer2_update(s, &s->timers[1], now); break; case VIA_REG_PCR: s->pcr = val; diff --git a/include/hw/misc/mos6522.h b/include/hw/misc/mos6522.h index fc95d22b0f..94b1dc324c 100644 --- a/include/hw/misc/mos6522.h +++ b/include/hw/misc/mos6522.h @@ -50,8 +50,10 @@ #define T1_INT 0x40 /* Timer 1 interrupt */ /* Bits in ACR */ +#define T2MODE 0x20 /* Timer 2 mode */ #define T1MODE 0xc0 /* Timer 1 mode */ #define T1MODE_CONT 0x40 /* continuous interrupts */ +#define T1MODE_ONESHOT 0x00 /* timed interrupt */ /* VIA registers */ #define VIA_REG_B 0x00 @@ -83,6 +85,7 @@ typedef struct MOS6522Timer { int64_t next_irq_time; uint64_t frequency; QEMUTimer *timer; + bool oneshot_fired; } MOS6522Timer; /** -- 2.26.3