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/*
* This file is part of the LinuxBIOS project.
*
* Copyright (C) 2005 Linux Networx
* (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
* Copyright (C) 2005 Ronald G. Minnich <rminnich@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/cardbus.h>
/* I don't think this code is quite correct but it is close.
* Anyone with a cardbus bridge and a little time should be able
* to make it usable quickly. -- Eric Biederman 24 March 2005
*/
/*
* IO should be max 256 bytes. However, since we may
* have a P2P bridge below a cardbus bridge, we need 4K.
*/
#define CARDBUS_IO_SIZE (4096)
#define CARDBUS_MEM_SIZE (32*1024*1024)
static void cardbus_record_bridge_resource(
device_t dev, resource_t moving, resource_t min_size,
unsigned index, unsigned long type)
{
/* Initiliaze the constraints on the current bus */
struct resource *resource;
resource = 0;
if (moving) {
unsigned long gran;
resource_t step;
resource = new_resource(dev, index);
resource->size = 0;
gran = 0;
step = 1;
while((moving & step) == 0) {
gran += 1;
step <<= 1;
}
resource->gran = gran;
resource->align = gran;
resource->limit = moving | (step - 1);
resource->flags = type;
/* Don't let the minimum size exceed what we
* can put in the resource.
*/
if ((min_size - 1) > resource->limit) {
min_size = resource->limit + 1;
}
resource->size = min_size;
}
return;
}
static void cardbus_size_bridge_resource(device_t dev, unsigned index)
{
struct resource *resource;
resource_t min_size;
resource = find_resource(dev, index);
if (resource) {
min_size = resource->size;
compute_allocate_resource(&dev->link[0], resource,
resource->flags, resource->flags);
/* Allways allocate at least the miniumum size to a
* cardbus bridge in case a new card is plugged in.
*/
if (resource->size < min_size) {
resource->size = min_size;
}
}
}
void cardbus_read_resources(device_t dev)
{
resource_t moving_base, moving_limit, moving;
unsigned long type;
uint16_t ctl;
/* See if needs a card control registers base address */
pci_get_resource(dev, PCI_BASE_ADDRESS_0);
compact_resources(dev);
/* See which bridge I/O resources are implemented */
moving_base = pci_moving_config32(dev, PCI_CB_IO_BASE_0);
moving_limit = pci_moving_config32(dev, PCI_CB_IO_LIMIT_0);
moving = moving_base & moving_limit;
/* Initialize the io space constraints on the current bus */
cardbus_record_bridge_resource(dev, moving, CARDBUS_IO_SIZE,
PCI_CB_IO_BASE_0, IORESOURCE_IO);
cardbus_size_bridge_resource(dev, PCI_CB_IO_BASE_0);
/* See which bridge I/O resources are implemented */
moving_base = pci_moving_config32(dev, PCI_CB_IO_BASE_1);
moving_limit = pci_moving_config32(dev, PCI_CB_IO_LIMIT_1);
moving = moving_base & moving_limit;
/* Initialize the io space constraints on the current bus */
cardbus_record_bridge_resource(dev, moving, CARDBUS_IO_SIZE,
PCI_CB_IO_BASE_1, IORESOURCE_IO);
/* If I can enable prefetch for mem0 */
ctl = pci_read_config16(dev, PCI_CB_BRIDGE_CONTROL);
ctl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
ctl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
ctl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
pci_write_config16(dev, PCI_CB_BRIDGE_CONTROL, ctl);
ctl = pci_read_config16(dev, PCI_CB_BRIDGE_CONTROL);
/* See which bridge memory resources are implemented */
moving_base = pci_moving_config32(dev, PCI_CB_MEMORY_BASE_0);
moving_limit = pci_moving_config32(dev, PCI_CB_MEMORY_LIMIT_0);
moving = moving_base & moving_limit;
/* Initialize the memory space constraints on the current bus */
type = IORESOURCE_MEM;
if (ctl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
type |= IORESOURCE_PREFETCH;
}
cardbus_record_bridge_resource(dev, moving, CARDBUS_MEM_SIZE,
PCI_CB_MEMORY_BASE_0, type);
if (type & IORESOURCE_PREFETCH) {
cardbus_size_bridge_resource(dev, PCI_CB_MEMORY_BASE_0);
}
/* See which bridge memory resources are implemented */
moving_base = pci_moving_config32(dev, PCI_CB_MEMORY_BASE_1);
moving_limit = pci_moving_config32(dev, PCI_CB_MEMORY_LIMIT_1);
moving = moving_base & moving_limit;
/* Initialize the memory space constraints on the current bus */
cardbus_record_bridge_resource(dev, moving, CARDBUS_MEM_SIZE,
PCI_CB_MEMORY_BASE_1, IORESOURCE_MEM);
cardbus_size_bridge_resource(dev, PCI_CB_MEMORY_BASE_1);
compact_resources(dev);
}
void cardbus_enable_resources(device_t dev)
{
uint16_t ctrl;
ctrl = pci_read_config16(dev, PCI_CB_BRIDGE_CONTROL);
ctrl |= (dev->link[0].bridge_ctrl & (
PCI_BRIDGE_CTL_PARITY |
PCI_BRIDGE_CTL_SERR |
PCI_BRIDGE_CTL_NO_ISA |
PCI_BRIDGE_CTL_VGA |
PCI_BRIDGE_CTL_MASTER_ABORT |
PCI_BRIDGE_CTL_BUS_RESET));
ctrl |= (PCI_CB_BRIDGE_CTL_PARITY + PCI_CB_BRIDGE_CTL_SERR); /* error check */
printk_debug("%s bridge ctrl <- %04x\n", dev_path(dev), ctrl);
pci_write_config16(dev, PCI_BRIDGE_CONTROL, ctrl);
pci_dev_enable_resources(dev);
enable_childrens_resources(dev);
}
unsigned int cardbus_scan_bus(struct bus *bus,
unsigned min_devfn, unsigned max_devfn,
unsigned int max)
{
return pci_scan_bus(bus, min_devfn, max_devfn, max);
}
unsigned int cardbus_scan_bridge(device_t dev, unsigned int max)
{
struct bus *bus;
uint32_t buses;
uint16_t cr;
printk_spew("%s for %s\n", __func__, dev_path(dev));
bus = &dev->link[0];
bus->dev = dev;
dev->links = 1;
/* Set up the primary, secondary and subordinate bus numbers. We have
* no idea how many buses are behind this bridge yet, so we set the
* subordinate bus number to 0xff for the moment.
*/
bus->secondary = ++max;
bus->subordinate = 0xff;
/* Clear all status bits and turn off memory, I/O and master enables. */
cr = pci_read_config16(dev, PCI_COMMAND);
pci_write_config16(dev, PCI_COMMAND, 0x0000);
pci_write_config16(dev, PCI_STATUS, 0xffff);
/*
* Read the existing primary/secondary/subordinate bus
* number configuration.
*/
buses = pci_read_config32(dev, PCI_CB_PRIMARY_BUS);
/* Configure the bus numbers for this bridge: the configuration
* transactions will not be propagated by the bridge if it is not
* correctly configured.
*/
buses &= 0xff000000;
buses |= (((unsigned int) (dev->bus->secondary) << 0) |
((unsigned int) (bus->secondary) << 8) |
((unsigned int) (bus->subordinate) << 16));
pci_write_config32(dev, PCI_CB_PRIMARY_BUS, buses);
/* Now we can scan all subordinate buses
* i.e. the bus behind the bridge.
*/
max = cardbus_scan_bus(bus, 0x00, 0xff, max);
/* We know the number of buses behind this bridge. Set the subordinate
* bus number to its real value.
*/
bus->subordinate = max;
buses = (buses & 0xff00ffff) |
((unsigned int) (bus->subordinate) << 16);
pci_write_config32(dev, PCI_CB_PRIMARY_BUS, buses);
pci_write_config16(dev, PCI_COMMAND, cr);
printk_spew("%s returns max %d\n", __func__, max);
return max;
}
struct device_operations default_cardbus_ops_bus = {
.read_resources = cardbus_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = cardbus_enable_resources,
.init = 0,
.scan_bus = cardbus_scan_bridge,
.enable = 0,
.reset_bus = pci_bus_reset,
};
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