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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: bus_pci.c,v 1.10 2005/03/18 23:20:52 debug Exp $ |
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* |
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* This is a generic PCI bus device, used by even lower level devices. |
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* For example, the "gt" device used in Cobalt machines contains a PCI |
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* device. |
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* |
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* TODO: This more or less just a dummy bus device, so far. |
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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 "memory.h" |
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#include "misc.h" |
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|
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#include "bus_pci.h" |
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|
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|
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/* |
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* bus_pci_access(): |
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* |
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* relative_addr should be either BUS_PCI_ADDR or BUS_PCI_DATA. The uint64_t |
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* pointed to by data should contain the word to be written to the pci bus, |
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* or a placeholder for information read from the bus. |
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* |
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* Returns 1 if ok, 0 on error. |
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*/ |
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int bus_pci_access(struct cpu *cpu, struct memory *mem, uint64_t relative_addr, |
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uint64_t *data, int writeflag, struct pci_data *pci_data) |
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{ |
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struct pci_device *dev, *found; |
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int bus, device, function, registernr; |
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|
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if (writeflag == MEM_READ) |
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*data = 0; |
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|
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switch (relative_addr) { |
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case BUS_PCI_ADDR: |
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if (writeflag == MEM_WRITE) { |
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debug("[ bus_pci: write to PCI ADDR: data = 0x%016llx" |
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" ]\n", (long long)*data); |
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pci_data->pci_addr = *data; |
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} else { |
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debug("[ bus_pci: read from PCI ADDR (data = " |
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"0x%016llx) ]\n", (long long)pci_data->pci_addr); |
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*data = pci_data->pci_addr; |
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} |
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break; |
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case BUS_PCI_DATA: |
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if (writeflag == MEM_WRITE) { |
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debug("[ bus_pci: write to PCI DATA: data = " |
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"0x%016llx ]\n", (long long)*data); |
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if (*data == 0xffffffffULL) |
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pci_data->last_was_write_ffffffff = 1; |
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} else { |
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/* Get the bus, device, and function numbers from |
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the address: */ |
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bus = (pci_data->pci_addr >> 16) & 0xff; |
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device = (pci_data->pci_addr >> 11) & 0x1f; |
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function = (pci_data->pci_addr >> 8) & 0x7; |
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registernr = (pci_data->pci_addr) & 0xff; |
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|
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/* Scan through the list of pci_device entries. */ |
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dev = pci_data->first_device; |
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found = NULL; |
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|
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while (dev != NULL && found == NULL) { |
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if (dev->bus == bus && |
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dev->function == function && |
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dev->device == device) |
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found = dev; |
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dev = dev->next; |
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} |
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|
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if (found == NULL) { |
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if ((pci_data->pci_addr & 0xff) == 0) |
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*data = 0xffffffff; |
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else |
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*data = 0; |
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return 1; |
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} |
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|
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*data = 0; |
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|
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if (pci_data->last_was_write_ffffffff && |
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registernr >= 0x10 && registernr <= 0x24) { |
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/* TODO: real length!!! */ |
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*data = 0x00400000 - 1; |
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} else if (found->read_register != NULL) |
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*data = found->read_register(registernr); |
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|
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pci_data->last_was_write_ffffffff = 0; |
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|
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debug("[ bus_pci: read from PCI DATA, addr = 0x%08lx " |
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"(bus %i, device %i, function %i, register " |
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"0x%02x): 0x%08lx ]\n", (long)pci_data->pci_addr, |
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bus, device, function, registernr, (long)*data); |
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} |
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|
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break; |
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default: |
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if (writeflag==MEM_READ) { |
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debug("[ bus_pci: read from unimplemented addr " |
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"0x%x ]\n", (int)relative_addr); |
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*data = 0; |
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} else { |
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debug("[ bus_pci: write to unimplemented addr " |
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"0x%x:", (int)relative_addr); |
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} |
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} |
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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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* bus_pci_add(): |
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* |
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* Add a PCI device to a bus_pci device. |
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*/ |
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void bus_pci_add(struct machine *machine, struct pci_data *pci_data, |
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struct memory *mem, int bus, int device, int function, |
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void (*init)(struct machine *, struct memory *), |
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uint32_t (*read_register)(int reg)) |
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{ |
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struct pci_device *new_device; |
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|
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/* Make sure this bus/device/function number isn't already in use: */ |
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new_device = pci_data->first_device; |
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while (new_device != NULL) { |
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if (new_device->bus == bus && |
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new_device->device == device && |
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new_device->function == function) { |
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fatal("bus_pci_add(): (bus %i, device %i, function" |
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" %i) already in use\n", bus, device, function); |
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return; |
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} |
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new_device = new_device->next; |
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} |
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|
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new_device = malloc(sizeof(struct pci_device)); |
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if (new_device == 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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|
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memset(new_device, 0, sizeof(struct pci_device)); |
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new_device->bus = bus; |
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new_device->device = device; |
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new_device->function = function; |
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new_device->init = init; |
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new_device->read_register = read_register; |
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|
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/* Add the new device first in the PCI bus' chain: */ |
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new_device->next = pci_data->first_device; |
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pci_data->first_device = new_device; |
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|
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/* Call the PCI device' init function: */ |
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if (init != NULL) |
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init(machine, mem); |
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} |
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|
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|
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/* |
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* bus_pci_init(): |
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* |
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* This doesn't register a device, but instead returns a pointer to a struct |
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* which should be passed to bus_pci_access() when accessing the PCI bus. |
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*/ |
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struct pci_data *bus_pci_init(int irq_nr) |
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{ |
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struct pci_data *d; |
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|
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d = malloc(sizeof(struct pci_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 pci_data)); |
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d->irq_nr = irq_nr; |
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|
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return d; |
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} |
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