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/* |
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* Copyright (C) 2004-2005 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: dev_8250.c,v 1.16 2005/02/26 11:56:42 debug Exp $ |
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* |
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* 8250 serial controller. |
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* |
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* TODO: Actually implement this device. So far it's just a fake device |
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* to allow Linux to print stuff to the console. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include "console.h" |
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#include "device.h" |
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#include "machine.h" |
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#include "memory.h" |
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#include "misc.h" |
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|
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|
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struct dev_8250_data { |
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int reg[8]; |
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|
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int console_handle; |
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int irq_enable; |
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int irqnr; |
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|
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int addrmult; |
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|
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int dlab; /* Divisor Latch Access bit */ |
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int divisor; |
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int databits; |
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char parity; |
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const char *stopbits; |
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}; |
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|
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#define DEV_8250_LENGTH 8 |
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|
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|
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/* |
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* dev_8250_tick(): |
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* |
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*/ |
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void dev_8250_tick(struct cpu *cpu, void *extra) |
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{ |
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#if 0 |
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/* This stuff works for 16550. TODO for 8250 */ |
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|
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struct dev_8250_data *d = extra; |
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|
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d->reg[REG_IID] |= IIR_NOPEND; |
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cpu_interrupt_ack(cpu, d->irqnr); |
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|
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if (console_charavail(d->console_handle)) |
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d->reg[REG_IID] |= IIR_RXRDY; |
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else |
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d->reg[REG_IID] &= ~IIR_RXRDY; |
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|
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if (d->reg[REG_MCR] & MCR_IENABLE) { |
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if (d->irq_enable & IER_ETXRDY && d->reg[REG_IID] & IIR_TXRDY) { |
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cpu_interrupt(cpu, d->irqnr); |
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d->reg[REG_IID] &= ~IIR_NOPEND; |
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} |
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|
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if (d->irq_enable & IER_ERXRDY && d->reg[REG_IID] & IIR_RXRDY) { |
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cpu_interrupt(cpu, d->irqnr); |
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d->reg[REG_IID] &= ~IIR_NOPEND; |
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} |
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} |
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#endif |
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} |
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|
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|
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/* |
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* dev_8250_access(): |
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*/ |
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int dev_8250_access(struct cpu *cpu, struct memory *mem, uint64_t relative_addr, |
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unsigned char *data, size_t len, int writeflag, void *extra) |
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{ |
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uint64_t idata = 0, odata = 0; |
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struct dev_8250_data *d = extra; |
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|
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idata = memory_readmax64(cpu, data, len); |
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relative_addr /= d->addrmult; |
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|
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if (writeflag == MEM_WRITE && relative_addr == 0) |
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console_putchar(d->console_handle, idata); |
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else |
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if (writeflag == MEM_READ && relative_addr == 5) |
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odata = 64 + 32; |
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else { |
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#if 0 |
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if (writeflag == MEM_WRITE) |
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fatal("[ 8250: write addr=0x%02x idata = 0x%02x ]\n", |
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(int)relative_addr, (int)idata); |
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else |
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fatal("[ 8250: read addr=0x%02x ]\n", relative_addr); |
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#endif |
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} |
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|
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if (writeflag == MEM_READ) |
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memory_writemax64(cpu, data, len, odata); |
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|
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return 1; |
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} |
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|
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|
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/* |
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* devinit_8250(): |
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*/ |
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int devinit_8250(struct devinit *devinit) |
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{ |
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struct dev_8250_data *d; |
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|
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d = malloc(sizeof(struct dev_8250_data)); |
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if (d == NULL) { |
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fprintf(stderr, "out of memory\n"); |
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exit(1); |
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} |
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memset(d, 0, sizeof(struct dev_8250_data)); |
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d->irqnr = devinit->irq_nr; |
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d->addrmult = devinit->addr_mult; |
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d->console_handle = console_start_slave(devinit->machine, "console"); |
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d->dlab = 0; |
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d->divisor = 115200 / 9600; |
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d->databits = 8; |
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d->parity = 'N'; |
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d->stopbits = "1"; |
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|
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memory_device_register(devinit->machine->memory, devinit->name, |
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devinit->addr, DEV_8250_LENGTH * devinit->addr_mult, |
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dev_8250_access, d, MEM_DEFAULT, NULL); |
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machine_add_tickfunction(devinit->machine, dev_8250_tick, d, 14); |
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|
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return 1; |
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} |
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