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- /*
- * PicoDrive
- * (C) notaz, 2009,2010,2013
- *
- * This work is licensed under the terms of MAME license.
- * See COPYING file in the top-level directory.
- */
- #include "../pico_int.h"
- static int pwm_cycles;
- static int pwm_mult;
- static int pwm_ptr;
- static int pwm_irq_reload;
- static int pwm_doing_fifo;
- static int pwm_silent;
- void p32x_pwm_ctl_changed(void)
- {
- int control = Pico32x.regs[0x30 / 2];
- int cycles = Pico32x.regs[0x32 / 2];
- cycles = (cycles - 1) & 0x0fff;
- pwm_cycles = cycles;
- // supposedly we should stop FIFO when xMd is 0,
- // but mars test disagrees
- pwm_mult = 0;
- if ((control & 0x0f) != 0)
- pwm_mult = 0x10000 / cycles;
- pwm_irq_reload = (control & 0x0f00) >> 8;
- pwm_irq_reload = ((pwm_irq_reload - 1) & 0x0f) + 1;
- if (Pico32x.pwm_irq_cnt == 0)
- Pico32x.pwm_irq_cnt = pwm_irq_reload;
- }
- static void do_pwm_irq(SH2 *sh2, unsigned int m68k_cycles)
- {
- p32x_trigger_irq(sh2, m68k_cycles, P32XI_PWM);
- if (Pico32x.regs[0x30 / 2] & P32XP_RTP) {
- p32x_event_schedule(m68k_cycles, P32X_EVENT_PWM, pwm_cycles / 3 + 1);
- // note: might recurse
- p32x_dreq1_trigger();
- }
- }
- static int convert_sample(unsigned int v)
- {
- if (v == 0)
- return 0;
- if (v > pwm_cycles)
- v = pwm_cycles;
- return ((int)v - pwm_cycles / 2) * pwm_mult;
- }
- #define consume_fifo(sh2, m68k_cycles) { \
- int cycles_diff = ((m68k_cycles) * 3) - Pico32x.pwm_cycle_p; \
- if (cycles_diff >= pwm_cycles) \
- consume_fifo_do(sh2, m68k_cycles, cycles_diff); \
- }
- static void consume_fifo_do(SH2 *sh2, unsigned int m68k_cycles,
- int sh2_cycles_diff)
- {
- struct Pico32xMem *mem = Pico32xMem;
- unsigned short *fifo_l = mem->pwm_fifo[0];
- unsigned short *fifo_r = mem->pwm_fifo[1];
- int sum = 0;
- if (pwm_cycles == 0 || pwm_doing_fifo)
- return;
- elprintf(EL_PWM, "pwm: %u: consume %d/%d, %d,%d ptr %d",
- m68k_cycles, sh2_cycles_diff, sh2_cycles_diff / pwm_cycles,
- Pico32x.pwm_p[0], Pico32x.pwm_p[1], pwm_ptr);
- // this is for recursion from dreq1 writes
- pwm_doing_fifo = 1;
- for (; sh2_cycles_diff >= pwm_cycles; sh2_cycles_diff -= pwm_cycles)
- {
- if (Pico32x.pwm_p[0] > 0) {
- fifo_l[0] = fifo_l[1];
- fifo_l[1] = fifo_l[2];
- fifo_l[2] = fifo_l[3];
- Pico32x.pwm_p[0]--;
- mem->pwm_current[0] = convert_sample(fifo_l[0]);
- sum += mem->pwm_current[0];
- }
- if (Pico32x.pwm_p[1] > 0) {
- fifo_r[0] = fifo_r[1];
- fifo_r[1] = fifo_r[2];
- fifo_r[2] = fifo_r[3];
- Pico32x.pwm_p[1]--;
- mem->pwm_current[1] = convert_sample(fifo_r[0]);
- sum += mem->pwm_current[1];
- }
- mem->pwm[pwm_ptr * 2 ] = mem->pwm_current[0];
- mem->pwm[pwm_ptr * 2 + 1] = mem->pwm_current[1];
- pwm_ptr = (pwm_ptr + 1) & (PWM_BUFF_LEN - 1);
- if (--Pico32x.pwm_irq_cnt == 0) {
- Pico32x.pwm_irq_cnt = pwm_irq_reload;
- do_pwm_irq(sh2, m68k_cycles);
- }
- }
- Pico32x.pwm_cycle_p = m68k_cycles * 3 - sh2_cycles_diff;
- pwm_doing_fifo = 0;
- if (sum != 0)
- pwm_silent = 0;
- }
- static int p32x_pwm_schedule_(SH2 *sh2, unsigned int m68k_now)
- {
- unsigned int sh2_now = m68k_now * 3;
- int cycles_diff_sh2;
- if (pwm_cycles == 0)
- return 0;
- cycles_diff_sh2 = sh2_now - Pico32x.pwm_cycle_p;
- if (cycles_diff_sh2 >= pwm_cycles)
- consume_fifo_do(sh2, m68k_now, cycles_diff_sh2);
- if (!((Pico32x.sh2irq_mask[0] | Pico32x.sh2irq_mask[1]) & 1))
- return 0; // masked by everyone
- cycles_diff_sh2 = sh2_now - Pico32x.pwm_cycle_p;
- return (Pico32x.pwm_irq_cnt * pwm_cycles
- - cycles_diff_sh2) / 3 + 1;
- }
- void p32x_pwm_schedule(unsigned int m68k_now)
- {
- int after = p32x_pwm_schedule_(NULL, m68k_now);
- if (after != 0)
- p32x_event_schedule(m68k_now, P32X_EVENT_PWM, after);
- }
- void p32x_pwm_schedule_sh2(SH2 *sh2)
- {
- int after = p32x_pwm_schedule_(sh2, sh2_cycles_done_m68k(sh2));
- if (after != 0)
- p32x_event_schedule_sh2(sh2, P32X_EVENT_PWM, after);
- }
- void p32x_pwm_sync_to_sh2(SH2 *sh2)
- {
- int m68k_cycles = sh2_cycles_done_m68k(sh2);
- consume_fifo(sh2, m68k_cycles);
- }
- void p32x_pwm_irq_event(unsigned int m68k_now)
- {
- p32x_pwm_schedule(m68k_now);
- }
- unsigned int p32x_pwm_read16(unsigned int a, SH2 *sh2,
- unsigned int m68k_cycles)
- {
- unsigned int d = 0;
- consume_fifo(sh2, m68k_cycles);
- a &= 0x0e;
- switch (a) {
- case 0: // control
- case 2: // cycle
- d = Pico32x.regs[(0x30 + a) / 2];
- break;
- case 4: // L ch
- if (Pico32x.pwm_p[0] == 3)
- d |= P32XP_FULL;
- else if (Pico32x.pwm_p[0] == 0)
- d |= P32XP_EMPTY;
- break;
- case 6: // R ch
- case 8: // MONO
- if (Pico32x.pwm_p[1] == 3)
- d |= P32XP_FULL;
- else if (Pico32x.pwm_p[1] == 0)
- d |= P32XP_EMPTY;
- break;
- }
- elprintf(EL_PWM, "pwm: %u: r16 %02x %04x (p %d %d)",
- m68k_cycles, a, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1]);
- return d;
- }
- void p32x_pwm_write16(unsigned int a, unsigned int d,
- SH2 *sh2, unsigned int m68k_cycles)
- {
- elprintf(EL_PWM, "pwm: %u: w16 %02x %04x (p %d %d)",
- m68k_cycles, a & 0x0e, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1]);
- consume_fifo(sh2, m68k_cycles);
- a &= 0x0e;
- if (a == 0) { // control
- // avoiding pops..
- if ((Pico32x.regs[0x30 / 2] & 0x0f) == 0)
- Pico32xMem->pwm_fifo[0][0] = Pico32xMem->pwm_fifo[1][0] = 0;
- Pico32x.regs[0x30 / 2] = d;
- p32x_pwm_ctl_changed();
- Pico32x.pwm_irq_cnt = pwm_irq_reload; // ?
- }
- else if (a == 2) { // cycle
- Pico32x.regs[0x32 / 2] = d & 0x0fff;
- p32x_pwm_ctl_changed();
- }
- else if (a <= 8) {
- d = (d - 1) & 0x0fff;
- if (a == 4 || a == 8) { // L ch or MONO
- unsigned short *fifo = Pico32xMem->pwm_fifo[0];
- if (Pico32x.pwm_p[0] < 3)
- Pico32x.pwm_p[0]++;
- else {
- fifo[1] = fifo[2];
- fifo[2] = fifo[3];
- }
- fifo[Pico32x.pwm_p[0]] = d;
- }
- if (a == 6 || a == 8) { // R ch or MONO
- unsigned short *fifo = Pico32xMem->pwm_fifo[1];
- if (Pico32x.pwm_p[1] < 3)
- Pico32x.pwm_p[1]++;
- else {
- fifo[1] = fifo[2];
- fifo[2] = fifo[3];
- }
- fifo[Pico32x.pwm_p[1]] = d;
- }
- }
- }
- void p32x_pwm_update(int *buf32, int length, int stereo)
- {
- short *pwmb;
- int step;
- int p = 0;
- int xmd;
- consume_fifo(NULL, SekCyclesDone());
- xmd = Pico32x.regs[0x30 / 2] & 0x0f;
- if (xmd == 0 || xmd == 0x06 || xmd == 0x09 || xmd == 0x0f)
- goto out; // invalid?
- if (pwm_silent)
- return;
- step = (pwm_ptr << 16) / length;
- pwmb = Pico32xMem->pwm;
- if (stereo)
- {
- if (xmd == 0x05) {
- // normal
- while (length-- > 0) {
- *buf32++ += pwmb[0];
- *buf32++ += pwmb[1];
- p += step;
- pwmb += (p >> 16) * 2;
- p &= 0xffff;
- }
- }
- else if (xmd == 0x0a) {
- // channel swap
- while (length-- > 0) {
- *buf32++ += pwmb[1];
- *buf32++ += pwmb[0];
- p += step;
- pwmb += (p >> 16) * 2;
- p &= 0xffff;
- }
- }
- else {
- // mono - LMD, RMD specify dst
- if (xmd & 0x06) // src is R
- pwmb++;
- if (xmd & 0x0c) // dst is R
- buf32++;
- while (length-- > 0) {
- *buf32 += *pwmb;
- p += step;
- pwmb += (p >> 16) * 2;
- p &= 0xffff;
- buf32 += 2;
- }
- }
- }
- else
- {
- // mostly unused
- while (length-- > 0) {
- *buf32++ += pwmb[0];
- p += step;
- pwmb += (p >> 16) * 2;
- p &= 0xffff;
- }
- }
- elprintf(EL_PWM, "pwm_update: pwm_ptr %d, len %d, step %04x, done %d",
- pwm_ptr, length, step, (pwmb - Pico32xMem->pwm) / 2);
- out:
- pwm_ptr = 0;
- pwm_silent = Pico32xMem->pwm_current[0] == 0
- && Pico32xMem->pwm_current[1] == 0;
- }
- void p32x_pwm_state_loaded(void)
- {
- int cycles_diff_sh2;
- p32x_pwm_ctl_changed();
- // for old savestates
- cycles_diff_sh2 = Pico.t.m68c_cnt * 3 - Pico32x.pwm_cycle_p;
- if (cycles_diff_sh2 >= pwm_cycles || cycles_diff_sh2 < 0) {
- Pico32x.pwm_irq_cnt = pwm_irq_reload;
- Pico32x.pwm_cycle_p = Pico.t.m68c_cnt * 3;
- p32x_pwm_schedule(Pico.t.m68c_cnt);
- }
- }
- // vim:shiftwidth=2:ts=2:expandtab
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