From 4fb435550b3f51abbfc8bb9ff25e0c110c7d7fa2 Mon Sep 17 00:00:00 2001 From: notaz Date: Thu, 29 Aug 2013 03:43:56 +0300 Subject: [PATCH] cd: fix busreq and reset --- pico/cd/mcd.c | 23 ++++++++++++++--------- pico/cd/memory.c | 49 ++++++++++++++++++++++++++---------------------- pico/pico.c | 4 ---- pico/pico_int.h | 4 +++- 4 files changed, 44 insertions(+), 36 deletions(-) diff --git a/pico/cd/mcd.c b/pico/cd/mcd.c index 82ae1bc6..8b807d30 100644 --- a/pico/cd/mcd.c +++ b/pico/cd/mcd.c @@ -35,19 +35,24 @@ PICO_INTERNAL void PicoPowerMCD(void) memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M)); memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram)); memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram)); - memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size); -} - -PICO_INTERNAL int PicoResetMCD(void) -{ + memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, + formatted_bram, fmt_size); memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs)); memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm)); memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m)); - memset(Pico_mcd->bios + 0x70, 0xff, 4); // reset hint vector (simplest way to implement reg6) - Pico_mcd->m.state_flags = 0; - Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset + // cold reset state (tested) + Pico_mcd->m.state_flags = PCD_ST_S68K_RST; + Pico_mcd->m.busreq = 2; // busreq on, s68k in reset + Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode, m68k access + Pico_mcd->s68k_regs[6] = 0xff; + Pico_mcd->s68k_regs[7] = 0xff; + memset(Pico_mcd->bios + 0x70, 0xff, 4); +} +PICO_INTERNAL int PicoResetMCD(void) +{ + // ?? Reset_CD(); LC89510_Reset(); gfx_cd_reset(); @@ -229,7 +234,7 @@ int pcd_sync_s68k(unsigned int m68k_target, int m68k_poll_sync) elprintf(EL_CD, "s68k sync to %u, %u->%u", m68k_target, now, s68k_target); - if ((Pico_mcd->m.busreq & 3) != 1) { /* busreq/reset */ + if (Pico_mcd->m.busreq != 1) { /* busreq/reset */ SekCycleCntS68k = SekCycleAimS68k = s68k_target; pcd_run_events(m68k_target); return 0; diff --git a/pico/cd/memory.c b/pico/cd/memory.c index 1d669a29..1064b91c 100644 --- a/pico/cd/memory.c +++ b/pico/cd/memory.c @@ -65,8 +65,8 @@ void PicoWriteS68k16_dec_m1b1(u32 a, u32 d); void PicoWriteS68k16_dec_m2b1(u32 a, u32 d); #endif -static void remap_prg_window(int r3); -static void remap_word_ram(int r3); +static void remap_prg_window(u32 r1, u32 r3); +static void remap_word_ram(u32 r3); // poller detection #define POLL_LIMIT 16 @@ -87,12 +87,14 @@ u32 m68k_comm_check(u32 a, u32 d) #ifndef _ASM_CD_MEMORY_C static u32 m68k_reg_read16(u32 a) { - u32 d=0; + u32 d = 0; a &= 0x3e; switch (a) { case 0: - d = ((Pico_mcd->s68k_regs[0x33]<<13)&0x8000) | Pico_mcd->m.busreq; // here IFL2 is always 0, just like in Gens + // here IFL2 is always 0, just like in Gens + d = ((Pico_mcd->s68k_regs[0x33] << 13) & 0x8000) + | Pico_mcd->m.busreq; goto end; case 2: d = (Pico_mcd->s68k_regs[a]<<8) | (Pico_mcd->s68k_regs[a+1]&0xc7); @@ -157,23 +159,26 @@ void m68k_reg_write8(u32 a, u32 d) return; case 1: d &= 3; - elprintf(EL_CDREGS, "d m.busreq %u %u", d, Pico_mcd->m.busreq); - if (d == Pico_mcd->m.busreq) + dold = Pico_mcd->m.busreq; + if (!(d & 1)) + d |= 2; // verified: can't release bus on reset + if (dold == d) return; + pcd_sync_s68k(SekCyclesDone(), 0); - if ((Pico_mcd->m.busreq ^ d) & 1) { + if ((dold ^ d) & 1) elprintf(EL_INTSW, "m68k: s68k reset %i", !(d&1)); - if (!(d & 1)) - d |= 2; // verified: reset also gives bus - else { - elprintf(EL_CDREGS, "m68k: resetting s68k"); - SekResetS68k(); - } + if (!(d & 1)) + Pico_mcd->m.state_flags |= PCD_ST_S68K_RST; + else if (d == 1 && (Pico_mcd->m.state_flags & PCD_ST_S68K_RST)) { + Pico_mcd->m.state_flags &= ~PCD_ST_S68K_RST; + elprintf(EL_CDREGS, "m68k: resetting s68k"); + SekResetS68k(); } - if ((Pico_mcd->m.busreq ^ d) & 2) { + if ((dold ^ d) & 2) { elprintf(EL_INTSW, "m68k: s68k brq %i", d >> 1); - remap_prg_window(Pico_mcd->s68k_regs[3]); + remap_prg_window(d, Pico_mcd->s68k_regs[3]); } Pico_mcd->m.busreq = d; return; @@ -187,7 +192,7 @@ void m68k_reg_write8(u32 a, u32 d) if ((d ^ dold) & 0xc0) { elprintf(EL_CDREGS, "m68k: prg bank: %i -> %i", (Pico_mcd->s68k_regs[a]>>6), ((d>>6)&3)); - remap_prg_window(d); + remap_prg_window(Pico_mcd->m.busreq, d); } // 2M mode state is tracked regardless of current mode @@ -953,11 +958,11 @@ static const void *s68k_dec_write16[2][4] = { // ----------------------------------------------------------------- -static void remap_prg_window(int r3) +static void remap_prg_window(u32 r1, u32 r3) { // PRG RAM - if (Pico_mcd->m.busreq & 2) { - void *bank = Pico_mcd->prg_ram_b[r3 >> 6]; + if (r1 & 2) { + void *bank = Pico_mcd->prg_ram_b[(r3 >> 6) & 3]; cpu68k_map_all_ram(0x020000, 0x03ffff, bank, 0); } else { @@ -965,7 +970,7 @@ static void remap_prg_window(int r3) } } -static void remap_word_ram(int r3) +static void remap_word_ram(u32 r3) { void *bank; @@ -1016,13 +1021,13 @@ static void remap_word_ram(int r3) void pcd_state_loaded_mem(void) { - int r3 = Pico_mcd->s68k_regs[3]; + u32 r3 = Pico_mcd->s68k_regs[3]; /* after load events */ if (r3 & 4) // 1M mode? wram_2M_to_1M(Pico_mcd->word_ram2M); remap_word_ram(r3); - remap_prg_window(r3); + remap_prg_window(Pico_mcd->m.busreq, r3); Pico_mcd->m.dmna_ret_2m &= 3; // restore hint vector diff --git a/pico/pico.c b/pico/pico.c index bd4621b3..696743f6 100644 --- a/pico/pico.c +++ b/pico/pico.c @@ -171,10 +171,6 @@ int PicoReset(void) SekSetRealTAS(PicoAHW & PAHW_MCD); SekCycleCnt = SekCycleAim = 0; - if (PicoAHW & PAHW_MCD) - // needed for MCD to reset properly, probably some bug hides behind this.. - memset(Pico.ioports,0,sizeof(Pico.ioports)); - Pico.m.dirtyPal = 1; Pico.m.z80_bank68k = 0; diff --git a/pico/pico_int.h b/pico/pico_int.h index 2053ac60..690c233c 100644 --- a/pico/pico_int.h +++ b/pico/pico_int.h @@ -382,10 +382,12 @@ struct mcd_pcm } ch[8]; }; +#define PCD_ST_S68K_RST 1 + struct mcd_misc { unsigned short hint_vector; - unsigned char busreq; + unsigned char busreq; // not s68k_regs[1] unsigned char s68k_pend_ints; unsigned int state_flags; // 04 unsigned int stopwatch_base_c; -- 2.39.5