/* * QEMU model of the Milkymist System Controller. * * Copyright (c) 2010 Michael Walle <michael@walle.cc> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. * * * Specification available at: * http://www.milkymist.org/socdoc/ac97.pdf */ #include "hw.h" #include "sysbus.h" #include "trace.h" #include "audio/audio.h" #include "qemu-error.h" enum { R_AC97_CTRL = 0, R_AC97_ADDR, R_AC97_DATAOUT, R_AC97_DATAIN, R_D_CTRL, R_D_ADDR, R_D_REMAINING, R_RESERVED, R_U_CTRL, R_U_ADDR, R_U_REMAINING, R_MAX }; enum { AC97_CTRL_RQEN = (1<<0), AC97_CTRL_WRITE = (1<<1), }; enum { CTRL_EN = (1<<0), }; struct MilkymistAC97State { SysBusDevice busdev; MemoryRegion regs_region; QEMUSoundCard card; SWVoiceIn *voice_in; SWVoiceOut *voice_out; uint32_t regs[R_MAX]; qemu_irq crrequest_irq; qemu_irq crreply_irq; qemu_irq dmar_irq; qemu_irq dmaw_irq; }; typedef struct MilkymistAC97State MilkymistAC97State; static void update_voices(MilkymistAC97State *s) { if (s->regs[R_D_CTRL] & CTRL_EN) { AUD_set_active_out(s->voice_out, 1); } else { AUD_set_active_out(s->voice_out, 0); } if (s->regs[R_U_CTRL] & CTRL_EN) { AUD_set_active_in(s->voice_in, 1); } else { AUD_set_active_in(s->voice_in, 0); } } static uint64_t ac97_read(void *opaque, target_phys_addr_t addr, unsigned size) { MilkymistAC97State *s = opaque; uint32_t r = 0; addr >>= 2; switch (addr) { case R_AC97_CTRL: case R_AC97_ADDR: case R_AC97_DATAOUT: case R_AC97_DATAIN: case R_D_CTRL: case R_D_ADDR: case R_D_REMAINING: case R_U_CTRL: case R_U_ADDR: case R_U_REMAINING: r = s->regs[addr]; break; default: error_report("milkymist_ac97: read access to unknown register 0x" TARGET_FMT_plx, addr << 2); break; } trace_milkymist_ac97_memory_read(addr << 2, r); return r; } static void ac97_write(void *opaque, target_phys_addr_t addr, uint64_t value, unsigned size) { MilkymistAC97State *s = opaque; trace_milkymist_ac97_memory_write(addr, value); addr >>= 2; switch (addr) { case R_AC97_CTRL: /* always raise an IRQ according to the direction */ if (value & AC97_CTRL_RQEN) { if (value & AC97_CTRL_WRITE) { trace_milkymist_ac97_pulse_irq_crrequest(); qemu_irq_pulse(s->crrequest_irq); } else { trace_milkymist_ac97_pulse_irq_crreply(); qemu_irq_pulse(s->crreply_irq); } } /* RQEN is self clearing */ s->regs[addr] = value & ~AC97_CTRL_RQEN; break; case R_D_CTRL: case R_U_CTRL: s->regs[addr] = value; update_voices(s); break; case R_AC97_ADDR: case R_AC97_DATAOUT: case R_AC97_DATAIN: case R_D_ADDR: case R_D_REMAINING: case R_U_ADDR: case R_U_REMAINING: s->regs[addr] = value; break; default: error_report("milkymist_ac97: write access to unknown register 0x" TARGET_FMT_plx, addr); break; } } static const MemoryRegionOps ac97_mmio_ops = { .read = ac97_read, .write = ac97_write, .valid = { .min_access_size = 4, .max_access_size = 4, }, .endianness = DEVICE_NATIVE_ENDIAN, }; static void ac97_in_cb(void *opaque, int avail_b) { MilkymistAC97State *s = opaque; uint8_t buf[4096]; uint32_t remaining = s->regs[R_U_REMAINING]; int temp = audio_MIN(remaining, avail_b); uint32_t addr = s->regs[R_U_ADDR]; int transferred = 0; trace_milkymist_ac97_in_cb(avail_b, remaining); /* prevent from raising an IRQ */ if (temp == 0) { return; } while (temp) { int acquired, to_copy; to_copy = audio_MIN(temp, sizeof(buf)); acquired = AUD_read(s->voice_in, buf, to_copy); if (!acquired) { break; } cpu_physical_memory_write(addr, buf, acquired); temp -= acquired; addr += acquired; transferred += acquired; } trace_milkymist_ac97_in_cb_transferred(transferred); s->regs[R_U_ADDR] = addr; s->regs[R_U_REMAINING] -= transferred; if ((s->regs[R_U_CTRL] & CTRL_EN) && (s->regs[R_U_REMAINING] == 0)) { trace_milkymist_ac97_pulse_irq_dmaw(); qemu_irq_pulse(s->dmaw_irq); } } static void ac97_out_cb(void *opaque, int free_b) { MilkymistAC97State *s = opaque; uint8_t buf[4096]; uint32_t remaining = s->regs[R_D_REMAINING]; int temp = audio_MIN(remaining, free_b); uint32_t addr = s->regs[R_D_ADDR]; int transferred = 0; trace_milkymist_ac97_out_cb(free_b, remaining); /* prevent from raising an IRQ */ if (temp == 0) { return; } while (temp) { int copied, to_copy; to_copy = audio_MIN(temp, sizeof(buf)); cpu_physical_memory_read(addr, buf, to_copy); copied = AUD_write(s->voice_out, buf, to_copy); if (!copied) { break; } temp -= copied; addr += copied; transferred += copied; } trace_milkymist_ac97_out_cb_transferred(transferred); s->regs[R_D_ADDR] = addr; s->regs[R_D_REMAINING] -= transferred; if ((s->regs[R_D_CTRL] & CTRL_EN) && (s->regs[R_D_REMAINING] == 0)) { trace_milkymist_ac97_pulse_irq_dmar(); qemu_irq_pulse(s->dmar_irq); } } static void milkymist_ac97_reset(DeviceState *d) { MilkymistAC97State *s = container_of(d, MilkymistAC97State, busdev.qdev); int i; for (i = 0; i < R_MAX; i++) { s->regs[i] = 0; } AUD_set_active_in(s->voice_in, 0); AUD_set_active_out(s->voice_out, 0); } static int ac97_post_load(void *opaque, int version_id) { MilkymistAC97State *s = opaque; update_voices(s); return 0; } static int milkymist_ac97_init(SysBusDevice *dev) { MilkymistAC97State *s = FROM_SYSBUS(typeof(*s), dev); struct audsettings as; sysbus_init_irq(dev, &s->crrequest_irq); sysbus_init_irq(dev, &s->crreply_irq); sysbus_init_irq(dev, &s->dmar_irq); sysbus_init_irq(dev, &s->dmaw_irq); AUD_register_card("Milkymist AC'97", &s->card); as.freq = 48000; as.nchannels = 2; as.fmt = AUD_FMT_S16; as.endianness = 1; s->voice_in = AUD_open_in(&s->card, s->voice_in, "mm_ac97.in", s, ac97_in_cb, &as); s->voice_out = AUD_open_out(&s->card, s->voice_out, "mm_ac97.out", s, ac97_out_cb, &as); memory_region_init_io(&s->regs_region, &ac97_mmio_ops, s, "milkymist-ac97", R_MAX * 4); sysbus_init_mmio(dev, &s->regs_region); return 0; } static const VMStateDescription vmstate_milkymist_ac97 = { .name = "milkymist-ac97", .version_id = 1, .minimum_version_id = 1, .minimum_version_id_old = 1, .post_load = ac97_post_load, .fields = (VMStateField[]) { VMSTATE_UINT32_ARRAY(regs, MilkymistAC97State, R_MAX), VMSTATE_END_OF_LIST() } }; static SysBusDeviceInfo milkymist_ac97_info = { .init = milkymist_ac97_init, .qdev.name = "milkymist-ac97", .qdev.size = sizeof(MilkymistAC97State), .qdev.vmsd = &vmstate_milkymist_ac97, .qdev.reset = milkymist_ac97_reset, }; static void milkymist_ac97_register(void) { sysbus_register_withprop(&milkymist_ac97_info); } device_init(milkymist_ac97_register)