static void imx_serial_write(void *opaque, target_phys_addr_t offset, uint64_t value, unsigned size) { IMXSerialState *s = (IMXSerialState *)opaque; unsigned char ch; DPRINTF("write(offset=%x, value = %x) to %s\n", offset >> 2, (unsigned int)value, s->chr ? s->chr->label : "NODEV"); switch (offset >> 2) { case 0x10: /* UTXD */ ch = value; if (s->ucr2 & UCR2_TXEN) { if (s->chr) { qemu_chr_fe_write(s->chr, &ch, 1); } s->usr1 &= ~USR1_TRDY; imx_update(s); s->usr1 |= USR1_TRDY; imx_update(s); } break; case 0x20: /* UCR1 */ s->ucr1 = value & 0xffff; DPRINTF("write(ucr1=%x)\n", (unsigned int)value); imx_update(s); break; case 0x21: /* UCR2 */ /* * Only a few bits in control register 2 are implemented as yet. * If it's intended to use a real serial device as a back-end, this * register will have to be implemented more fully. */ if (!(value & UCR2_SRST)) { imx_serial_reset(s); imx_update(s); value |= UCR2_SRST; } if (value & UCR2_RXEN) { if (!(s->ucr2 & UCR2_RXEN)) { qemu_chr_accept_input(s->chr); } } s->ucr2 = value & 0xffff; break; case 0x25: /* USR1 */ value &= USR1_AWAKE | USR1_AIRINT | USR1_DTRD | USR1_AGTIM | USR1_FRAMERR | USR1_ESCF | USR1_RTSD | USR1_PARTYER; s->usr1 &= ~value; break; case 0x26: /* USR2 */ /* * Writing 1 to some bits clears them; all other * values are ignored */ value &= USR2_ADET | USR2_DTRF | USR2_IDLE | USR2_ACST | USR2_RIDELT | USR2_IRINT | USR2_WAKE | USR2_DCDDELT | USR2_RTSF | USR2_BRCD | USR2_ORE; s->usr2 &= ~value; break; /* * Linux expects to see what it writes to these registers * We don't currently alter the baud rate */ case 0x29: /* UBIR */ s->ubrc = value & 0xffff; break; case 0x2a: /* UBMR */ s->ubmr = value & 0xffff; break; case 0x2c: /* One ms reg */ s->onems = value & 0xffff; break; case 0x24: /* FIFO control register */ s->ufcr = value & 0xffff; break; case 0x22: /* UCR3 */ s->ucr3 = value & 0xffff; break; case 0x2d: /* UTS1 */ case 0x23: /* UCR4 */ IPRINTF("Unimplemented Register %x written to\n", offset >> 2); /* TODO */ break; default: IPRINTF("imx_serial_write: Bad offset 0x%x\n", (int)offset); } }