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/* |
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* Copyright (C) 2005-2006 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_footbridge.c,v 1.42 2006/02/09 20:02:59 debug Exp $ |
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* |
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* Footbridge. Used in Netwinder and Cats. |
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* |
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* TODO: |
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* o) Add actual support for the fcom serial port. |
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* o) FIQs. |
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* o) Pretty much everything else as well :) (This entire thing |
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* is a quick hack to work primarily with NetBSD and OpenBSD |
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* as a guest OS.) |
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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 "bus_pci.h" |
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#include "console.h" |
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#include "cpu.h" |
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#include "device.h" |
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#include "devices.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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#include "dc21285reg.h" |
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|
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#define DEV_FOOTBRIDGE_TICK_SHIFT 14 |
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#define DEV_FOOTBRIDGE_LENGTH 0x400 |
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#define TIMER_POLL_THRESHOLD 15 |
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|
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|
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/* |
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* dev_footbridge_tick(): |
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* |
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* The 4 footbridge timers should decrease every now and then, and cause |
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* interrupts. Periodic interrupts restart as soon as they are acknowledged, |
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* non-periodic interrupts need to be "reloaded" to restart. |
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*/ |
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void dev_footbridge_tick(struct cpu *cpu, void *extra) |
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{ |
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int i; |
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struct footbridge_data *d = (struct footbridge_data *) extra; |
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|
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if (!d->timer_being_read) |
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d->timer_poll_mode = 0; |
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|
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for (i=0; i<N_FOOTBRIDGE_TIMERS; i++) { |
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unsigned int amount = 1 << DEV_FOOTBRIDGE_TICK_SHIFT; |
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if (d->timer_control[i] & TIMER_FCLK_16) |
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amount >>= 4; |
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else if (d->timer_control[i] & TIMER_FCLK_256) |
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amount >>= 8; |
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|
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if (d->timer_tick_countdown[i] == 0) |
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continue; |
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|
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if (d->timer_value[i] > amount) |
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d->timer_value[i] -= amount; |
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else |
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d->timer_value[i] = 0; |
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|
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if (d->timer_value[i] == 0) { |
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d->timer_tick_countdown[i] --; |
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if (d->timer_tick_countdown[i] > 0) |
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continue; |
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|
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if (d->timer_control[i] & TIMER_ENABLE) |
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cpu_interrupt(cpu, IRQ_TIMER_1 + i); |
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d->timer_tick_countdown[i] = 0; |
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} |
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} |
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} |
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|
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|
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/* |
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* dev_footbridge_isa_access(): |
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* |
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* Reading the byte at 0x79000000 is a quicker way to figure out which ISA |
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* interrupt has occurred (and acknowledging it at the same time), than |
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* dealing with the legacy 0x20/0xa0 ISA ports. |
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*/ |
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DEVICE_ACCESS(footbridge_isa) |
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{ |
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/* struct footbridge_data *d = extra; */ |
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uint64_t idata = 0, odata = 0; |
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int x; |
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|
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if (writeflag == MEM_WRITE) { |
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idata = memory_readmax64(cpu, data, len); |
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fatal("[ footbridge_isa: WARNING/TODO: write! ]\n"); |
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} |
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|
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x = cpu->machine->isa_pic_data.last_int; |
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if (x == 0) |
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cpu_interrupt_ack(cpu, 32 + x); |
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|
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if (x < 8) |
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odata = cpu->machine->isa_pic_data.pic1->irq_base + x; |
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else |
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odata = cpu->machine->isa_pic_data.pic2->irq_base + x - 8; |
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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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* dev_footbridge_pci_access(): |
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* |
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* The Footbridge PCI configuration space is implemented as a direct memory |
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* space (i.e. not one port for addr and one port for data). This function |
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* translates that into bus_pci calls. |
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*/ |
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DEVICE_ACCESS(footbridge_pci) |
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{ |
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struct footbridge_data *d = extra; |
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uint64_t idata = 0, odata = 0; |
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int bus, dev, func, reg; |
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|
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if (writeflag == MEM_WRITE) |
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idata = memory_readmax64(cpu, data, len|MEM_PCI_LITTLE_ENDIAN); |
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|
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/* Decompose the (direct) address into its components: */ |
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bus_pci_decompose_1(relative_addr, &bus, &dev, &func, ®); |
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bus_pci_setaddr(cpu, d->pcibus, bus, dev, func, reg); |
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|
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if (bus == 255) { |
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fatal("[ footbridge DEBUG ERROR: bus 255 unlikely," |
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" pc (might not be updated) = 0x%08x ]\n", (int)cpu->pc); |
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exit(1); |
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} |
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|
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debug("[ footbridge pci: %s bus %i, device %i, function %i, register " |
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"%i ]\n", writeflag == MEM_READ? "read from" : "write to", bus, |
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dev, func, reg); |
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|
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bus_pci_data_access(cpu, d->pcibus, writeflag == MEM_READ? |
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&odata : &idata, len, writeflag); |
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|
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if (writeflag == MEM_READ) |
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memory_writemax64(cpu, data, len|MEM_PCI_LITTLE_ENDIAN, 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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* dev_footbridge_access(): |
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* |
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* The DC21285 registers. |
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*/ |
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DEVICE_ACCESS(footbridge) |
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{ |
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struct footbridge_data *d = extra; |
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uint64_t idata = 0, odata = 0; |
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int timer_nr = 0; |
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|
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if (writeflag == MEM_WRITE) |
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idata = memory_readmax64(cpu, data, len); |
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|
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if (relative_addr >= TIMER_1_LOAD && relative_addr <= TIMER_4_CLEAR) { |
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timer_nr = (relative_addr >> 5) & (N_FOOTBRIDGE_TIMERS - 1); |
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relative_addr &= ~0x060; |
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} |
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|
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switch (relative_addr) { |
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|
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case VENDOR_ID: |
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odata = 0x1011; /* DC21285_VENDOR_ID */ |
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break; |
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|
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case DEVICE_ID: |
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odata = 0x1065; /* DC21285_DEVICE_ID */ |
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break; |
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|
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case 0x04: |
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case 0x0c: |
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case 0x10: |
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case 0x14: |
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case 0x18: |
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/* TODO. Written to by Linux. */ |
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break; |
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|
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case REVISION: |
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odata = 3; /* footbridge revision number */ |
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break; |
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|
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case PCI_ADDRESS_EXTENSION: |
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/* TODO: Written to by Linux. */ |
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if (writeflag == MEM_WRITE && idata != 0) |
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fatal("[ footbridge: TODO: write to PCI_ADDRESS_" |
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"EXTENSION: 0x%llx ]\n", (long long)idata); |
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break; |
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|
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case SA_CONTROL: |
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/* Read by Linux: */ |
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odata = PCI_CENTRAL_FUNCTION; |
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break; |
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|
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case UART_DATA: |
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if (writeflag == MEM_WRITE) |
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console_putchar(d->console_handle, idata); |
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break; |
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|
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case UART_RX_STAT: |
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/* TODO */ |
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odata = 0; |
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break; |
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|
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case UART_FLAGS: |
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odata = UART_TX_EMPTY; |
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break; |
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|
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case IRQ_STATUS: |
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if (writeflag == MEM_READ) |
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odata = d->irq_status & d->irq_enable; |
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else { |
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fatal("[ WARNING: footbridge write to irq status? ]\n"); |
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exit(1); |
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} |
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break; |
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|
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case IRQ_RAW_STATUS: |
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if (writeflag == MEM_READ) |
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odata = d->irq_status; |
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else { |
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fatal("[ footbridge write to irq_raw_status ]\n"); |
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exit(1); |
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} |
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break; |
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|
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case IRQ_ENABLE_SET: |
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if (writeflag == MEM_WRITE) { |
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d->irq_enable |= idata; |
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cpu_interrupt(cpu, 64); |
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} else { |
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odata = d->irq_enable; |
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fatal("[ WARNING: footbridge read from " |
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"ENABLE SET? ]\n"); |
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exit(1); |
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} |
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break; |
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|
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case IRQ_ENABLE_CLEAR: |
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if (writeflag == MEM_WRITE) { |
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d->irq_enable &= ~idata; |
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cpu_interrupt(cpu, 64); |
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} else { |
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odata = d->irq_enable; |
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fatal("[ WARNING: footbridge read from " |
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"ENABLE CLEAR? ]\n"); |
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exit(1); |
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} |
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break; |
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|
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case FIQ_STATUS: |
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if (writeflag == MEM_READ) |
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odata = d->fiq_status & d->fiq_enable; |
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else { |
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fatal("[ WARNING: footbridge write to fiq status? ]\n"); |
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exit(1); |
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} |
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break; |
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|
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case FIQ_RAW_STATUS: |
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if (writeflag == MEM_READ) |
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odata = d->fiq_status; |
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else { |
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fatal("[ footbridge write to fiq_raw_status ]\n"); |
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exit(1); |
| 302 |
} |
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break; |
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|
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case FIQ_ENABLE_SET: |
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if (writeflag == MEM_WRITE) |
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d->fiq_enable |= idata; |
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break; |
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|
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case FIQ_ENABLE_CLEAR: |
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if (writeflag == MEM_WRITE) |
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d->fiq_enable &= ~idata; |
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break; |
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|
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case TIMER_1_LOAD: |
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if (writeflag == MEM_READ) |
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odata = d->timer_load[timer_nr]; |
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else { |
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d->timer_value[timer_nr] = |
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d->timer_load[timer_nr] = idata & TIMER_MAX_VAL; |
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debug("[ footbridge: timer %i (1-based), value %i ]\n", |
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timer_nr + 1, (int)d->timer_value[timer_nr]); |
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d->timer_tick_countdown[timer_nr] = 1; |
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cpu_interrupt_ack(cpu, IRQ_TIMER_1 + timer_nr); |
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} |
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break; |
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|
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case TIMER_1_VALUE: |
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if (writeflag == MEM_READ) { |
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/* |
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* NOTE/TODO: This is INCORRECT but speeds up NetBSD |
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* and OpenBSD boot sequences: if the timer is polled |
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* "very often" (such as during bootup), then this |
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* causes the timers to expire quickly. |
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*/ |
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d->timer_being_read = 1; |
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d->timer_poll_mode ++; |
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if (d->timer_poll_mode >= TIMER_POLL_THRESHOLD) { |
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d->timer_poll_mode = TIMER_POLL_THRESHOLD; |
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dev_footbridge_tick(cpu, d); |
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dev_footbridge_tick(cpu, d); |
| 342 |
dev_footbridge_tick(cpu, d); |
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} |
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odata = d->timer_value[timer_nr]; |
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d->timer_being_read = 0; |
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} else |
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d->timer_value[timer_nr] = idata & TIMER_MAX_VAL; |
| 348 |
break; |
| 349 |
|
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case TIMER_1_CONTROL: |
| 351 |
if (writeflag == MEM_READ) |
| 352 |
odata = d->timer_control[timer_nr]; |
| 353 |
else { |
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d->timer_control[timer_nr] = idata; |
| 355 |
if (idata & TIMER_FCLK_16 && |
| 356 |
idata & TIMER_FCLK_256) { |
| 357 |
fatal("TODO: footbridge timer: " |
| 358 |
"both 16 and 256?\n"); |
| 359 |
exit(1); |
| 360 |
} |
| 361 |
if (idata & TIMER_ENABLE) { |
| 362 |
d->timer_value[timer_nr] = |
| 363 |
d->timer_load[timer_nr]; |
| 364 |
d->timer_tick_countdown[timer_nr] = 1; |
| 365 |
} |
| 366 |
cpu_interrupt_ack(cpu, IRQ_TIMER_1 + timer_nr); |
| 367 |
} |
| 368 |
break; |
| 369 |
|
| 370 |
case TIMER_1_CLEAR: |
| 371 |
if (d->timer_control[timer_nr] & TIMER_MODE_PERIODIC) { |
| 372 |
d->timer_value[timer_nr] = d->timer_load[timer_nr]; |
| 373 |
d->timer_tick_countdown[timer_nr] = 1; |
| 374 |
} |
| 375 |
cpu_interrupt_ack(cpu, IRQ_TIMER_1 + timer_nr); |
| 376 |
break; |
| 377 |
|
| 378 |
default:if (writeflag == MEM_READ) { |
| 379 |
fatal("[ footbridge: read from 0x%x ]\n", |
| 380 |
(int)relative_addr); |
| 381 |
} else { |
| 382 |
fatal("[ footbridge: write to 0x%x: 0x%llx ]\n", |
| 383 |
(int)relative_addr, (long long)idata); |
| 384 |
} |
| 385 |
} |
| 386 |
|
| 387 |
if (writeflag == MEM_READ) |
| 388 |
memory_writemax64(cpu, data, len, odata); |
| 389 |
|
| 390 |
return 1; |
| 391 |
} |
| 392 |
|
| 393 |
|
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DEVINIT(footbridge) |
| 395 |
{ |
| 396 |
struct footbridge_data *d; |
| 397 |
uint64_t pci_addr = 0x7b000000; |
| 398 |
int i; |
| 399 |
|
| 400 |
d = malloc(sizeof(struct footbridge_data)); |
| 401 |
if (d == NULL) { |
| 402 |
fprintf(stderr, "out of memory\n"); |
| 403 |
exit(1); |
| 404 |
} |
| 405 |
memset(d, 0, sizeof(struct footbridge_data)); |
| 406 |
|
| 407 |
/* DC21285 register access: */ |
| 408 |
memory_device_register(devinit->machine->memory, devinit->name, |
| 409 |
devinit->addr, DEV_FOOTBRIDGE_LENGTH, |
| 410 |
dev_footbridge_access, d, DM_DEFAULT, NULL); |
| 411 |
|
| 412 |
/* ISA interrupt status/acknowledgement: */ |
| 413 |
memory_device_register(devinit->machine->memory, "footbridge_isa", |
| 414 |
0x79000000, 8, dev_footbridge_isa_access, d, DM_DEFAULT, NULL); |
| 415 |
|
| 416 |
/* The "fcom" console: */ |
| 417 |
d->console_handle = console_start_slave(devinit->machine, "fcom", 0); |
| 418 |
|
| 419 |
/* A PCI bus: */ |
| 420 |
d->pcibus = bus_pci_init( |
| 421 |
devinit->machine, |
| 422 |
devinit->irq_nr, /* PCI controller irq */ |
| 423 |
0x7c000000, /* PCI device io offset */ |
| 424 |
0x80000000, /* PCI device mem offset */ |
| 425 |
0x00000000, /* PCI port base */ |
| 426 |
0x00000000, /* PCI mem base */ |
| 427 |
0, /* PCI irq base: TODO */ |
| 428 |
0x7c000000, /* ISA port base */ |
| 429 |
0x80000000, /* ISA mem base */ |
| 430 |
32); /* ISA port base */ |
| 431 |
|
| 432 |
/* ... with some default devices for known machine types: */ |
| 433 |
switch (devinit->machine->machine_type) { |
| 434 |
case MACHINE_CATS: |
| 435 |
bus_pci_add(devinit->machine, d->pcibus, |
| 436 |
devinit->machine->memory, 0xc0, 7, 0, "ali_m1543"); |
| 437 |
bus_pci_add(devinit->machine, d->pcibus, |
| 438 |
devinit->machine->memory, 0xc0, 10, 0, "dec21143"); |
| 439 |
bus_pci_add(devinit->machine, d->pcibus, |
| 440 |
devinit->machine->memory, 0xc0, 16, 0, "ali_m5229"); |
| 441 |
break; |
| 442 |
case MACHINE_NETWINDER: |
| 443 |
bus_pci_add(devinit->machine, d->pcibus, |
| 444 |
devinit->machine->memory, 0xc0, 11, 0, "symphony_83c553"); |
| 445 |
bus_pci_add(devinit->machine, d->pcibus, |
| 446 |
devinit->machine->memory, 0xc0, 11, 1, "symphony_82c105"); |
| 447 |
break; |
| 448 |
default:fatal("footbridge: unimplemented machine type.\n"); |
| 449 |
exit(1); |
| 450 |
} |
| 451 |
|
| 452 |
/* PCI configuration space: */ |
| 453 |
memory_device_register(devinit->machine->memory, |
| 454 |
"footbridge_pci", pci_addr, 0x1000000, |
| 455 |
dev_footbridge_pci_access, d, DM_DEFAULT, NULL); |
| 456 |
|
| 457 |
/* Timer ticks: */ |
| 458 |
for (i=0; i<N_FOOTBRIDGE_TIMERS; i++) { |
| 459 |
d->timer_control[i] = TIMER_MODE_PERIODIC; |
| 460 |
d->timer_load[i] = TIMER_MAX_VAL; |
| 461 |
} |
| 462 |
machine_add_tickfunction(devinit->machine, |
| 463 |
dev_footbridge_tick, d, DEV_FOOTBRIDGE_TICK_SHIFT); |
| 464 |
|
| 465 |
devinit->return_ptr = d; |
| 466 |
return 1; |
| 467 |
} |
| 468 |
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