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- Major update of the dynamic device tree so it can handle

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* subtractive resources
  * merging with the static device tree
  * more device types than just pci
- The piece to watch out for is the new enable_resources method that was needed in all of the drivers


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1096 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Eric Biederman
2003-09-02 03:36:25 +00:00
parent d4c14524f5
commit e9a271e32c
25 changed files with 876 additions and 377 deletions
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246
src/devices/device.c
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@@ -1,6 +1,7 @@
/*
* (c) 1999--2000 Martin Mares <mj@suse.cz>
* (c) 2003 Eric Biederman <ebiederm@xmission.com>
* (c) 2003 Linux Networx
*/
/* lots of mods by ron minnich (rminnich@lanl.gov), with
* the final architecture guidance from Tom Merritt (tjm@codegen.com)
@@ -18,12 +19,9 @@
#include <arch/io.h>
#include <device/device.h>
#include <device/pci.h>
#include <stdlib.h>
#include <string.h>
/**
* This is the root of the device tree. A PCI tree always has
* one bus, bus 0. Bus 0 contains devices and bridges.
*/
struct device dev_root;
/* Linked list of ALL devices */
struct device *all_devices = 0;
/* pointer to the last device */
@@ -32,16 +30,46 @@ static struct device **last_dev_p = &all_devices;
#define DEVICE_MEM_HIGH 0xFEC00000UL /* Reserve 20M for the system */
#define DEVICE_IO_START 0x1000
/* Append a new device to the global device chain.
* The chain is used to find devices once everything is set up.
/** Allocate a new device structure
*/
void append_device(struct device *dev)
device_t alloc_dev(struct bus *parent, struct device_path *path)
{
device_t dev, child;
int link;
/* Find the last child of our parent */
for(child = parent->children; child && child->sibling; ) {
child = child->sibling;
}
dev = malloc(sizeof(*dev));
if (dev == 0) {
die("DEV: out of memory.\n");
}
memset(dev, 0, sizeof(*dev));
memcpy(&dev->path, path, sizeof(*path));
/* Append a new device to the global device chain.
* The chain is used to find devices once everything is set up.
*/
*last_dev_p = dev;
last_dev_p = &dev->next;
}
/* Initialize the back pointers in the link fields */
for(link = 0; link < MAX_LINKS; link++) {
dev->link[link].dev = dev;
dev->link[link].link = link;
}
/* Add the new device to the children of the bus. */
dev->bus = parent;
if (child) {
child->sibling = dev;
} else {
parent->children = dev;
}
/* If we don't have any other information about a device enable it */
dev->enable = 1;
return dev;
}
/** round a number to an alignment.
* @param val the starting value
@@ -71,28 +99,79 @@ static unsigned long round_down(unsigned long val, unsigned long round_down)
/** Read the resources on all devices of a given bus.
* @param bus bus to read the resources on.
*/
static void read_resources(struct device *bus)
static void read_resources(struct bus *bus)
{
struct device *curdev;
/* Walk through all of the devices and find which resources they need. */
for(curdev = bus->children; curdev; curdev = curdev->sibling) {
unsigned links;
int i;
if (curdev->resources > 0) {
continue;
}
if (!curdev->ops || !curdev->ops->read_resources) {
printk_err("%s missing read_resources\n",
dev_path(curdev));
continue;
}
curdev->ops->read_resources(curdev);
/* Read in subtractive resources behind the current device */
links = 0;
for(i = 0; i < curdev->resources; i++) {
struct resource *resource;
resource = &curdev->resource[i];
if ((resource->flags & IORESOURCE_SUBTRACTIVE) &&
(!(links & (1 << resource->index))))
{
links |= (1 << resource->index);
read_resources(&curdev->link[resource->index]);
}
}
}
}
static struct device *largest_resource(struct device *bus, struct resource **result_res,
unsigned long type_mask, unsigned long type)
struct pick_largest_state {
struct resource *last;
struct device *result_dev;
struct resource *result;
int seen_last;
};
static void pick_largest_resource(
struct pick_largest_state *state, struct device *dev, struct resource *resource)
{
struct resource *last;
last = state->last;
/* Be certain to pick the successor to last */
if (resource == last) {
state->seen_last = 1;
return;
}
if (last && (
(last->align < resource->align) ||
((last->align == resource->align) &&
(last->size < resource->size)) ||
((last->align == resource->align) &&
(last->size == resource->size) &&
(!state->seen_last)))) {
return;
}
if (!state->result ||
(state->result->align < resource->align) ||
((state->result->align == resource->align) &&
(state->result->size < resource->size))) {
state->result_dev = dev;
state->result = resource;
}
}
static void find_largest_resource(struct pick_largest_state *state,
struct bus *bus, unsigned long type_mask, unsigned long type)
{
struct device *curdev;
struct device *result_dev = 0;
struct resource *last = *result_res;
struct resource *result = 0;
int seen_last = 0;
for(curdev = bus->children; curdev; curdev = curdev->sibling) {
int i;
for(i = 0; i < curdev->resources; i++) {
@@ -101,31 +180,33 @@ static struct device *largest_resource(struct device *bus, struct resource **res
if ((resource->flags & type_mask) != type) {
continue;
}
/* Be certain to pick the successor to last */
if (resource == last) {
seen_last = 1;
/* If it is a subtractive resource recurse */
if (resource->flags & IORESOURCE_SUBTRACTIVE) {
struct bus *subbus;
subbus = &curdev->link[resource->index];
find_largest_resource(state, subbus, type_mask, type);
continue;
}
if (last && (
(last->align < resource->align) ||
((last->align == resource->align) &&
(last->size < resource->size)) ||
((last->align == resource->align) &&
(last->size == resource->size) &&
(!seen_last)))) {
continue;
}
if (!result ||
(result->align < resource->align) ||
((result->align == resource->align) &&
(result->size < resource->size))) {
result_dev = curdev;
result = resource;
}
/* See if this is the largest resource */
pick_largest_resource(state, curdev, resource);
}
}
*result_res = result;
return result_dev;
}
static struct device *largest_resource(struct bus *bus, struct resource **result_res,
unsigned long type_mask, unsigned long type)
{
struct pick_largest_state state;
state.last = *result_res;
state.result_dev = 0;
state.result = 0;
state.seen_last = 0;
find_largest_resource(&state, bus, type_mask, type);
*result_res = state.result;
return state.result_dev;
}
/* Compute allocate resources is the guts of the resource allocator.
@@ -158,7 +239,7 @@ static struct device *largest_resource(struct device *bus, struct resource **res
*/
void compute_allocate_resource(
struct device *bus,
struct bus *bus,
struct resource *bridge,
unsigned long type_mask,
unsigned long type)
@@ -181,9 +262,8 @@ void compute_allocate_resource(
min_align = log2(DEVICE_MEM_ALIGN);
}
printk_spew("DEV: %02x:%02x.%01x compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d\n",
bus->bus->secondary,
PCI_SLOT(bus->devfn), PCI_FUNC(bus->devfn),
printk_spew("%s compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d\n",
dev_path(dev),
(bridge->flags & IORESOURCE_IO)? "io":
(bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem",
base, bridge->size, bridge->align, bridge->gran);
@@ -214,6 +294,9 @@ void compute_allocate_resource(
if (align < min_align) {
align = min_align;
}
if (resource->flags & IORESOURCE_FIXED) {
continue;
}
if (resource->flags & IORESOURCE_IO) {
/* Don't allow potential aliases over the
* legacy pci expansion card addresses.
@@ -240,9 +323,8 @@ void compute_allocate_resource(
base += size;
printk_spew(
"DEV: %02x:%02x.%01x %02x * [0x%08lx - 0x%08lx] %s\n",
dev->bus->secondary,
PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn),
"%s %02x * [0x%08lx - 0x%08lx] %s\n",
dev_path(dev),
resource->index,
resource->base, resource->base + resource->size -1,
(resource->flags & IORESOURCE_IO)? "io":
@@ -258,9 +340,8 @@ void compute_allocate_resource(
*/
bridge->size = round(base, 1UL << bridge->gran) - bridge->base;
printk_spew("DEV: %02x:%02x.%01x compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d done\n",
bus->bus->secondary,
PCI_SLOT(bus->devfn), PCI_FUNC(bus->devfn),
printk_spew("%s compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d done\n",
dev_path(dev),
(bridge->flags & IORESOURCE_IO)? "io":
(bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem",
base, bridge->size, bridge->align, bridge->gran);
@@ -270,14 +351,15 @@ void compute_allocate_resource(
static void allocate_vga_resource(void)
{
#warning "FIXME modify allocate_vga_resource so it is less pci centric!"
/* FIXME handle the VGA pallette snooping */
struct device *dev, *vga, *bus;
bus = vga = 0;
struct device *dev, *vga;
struct bus *bus;
bus = 0;
vga = 0;
for(dev = all_devices; dev; dev = dev->next) {
uint32_t class_revision;
class_revision = pci_read_config32(dev, PCI_CLASS_REVISION);
if (((class_revision >> 24) == 0x03) &&
((class_revision >> 16) != 0x380)) {
if (((dev->class >> 16) == 0x03) &&
((dev->class >> 8) != 0x380)) {
if (!vga) {
printk_debug("Allocating VGA resource\n");
vga = dev;
@@ -296,11 +378,8 @@ static void allocate_vga_resource(void)
}
/* Now walk up the bridges setting the VGA enable */
while(bus) {
uint16_t ctrl;
ctrl = pci_read_config16(bus, PCI_BRIDGE_CONTROL);
ctrl |= PCI_BRIDGE_CTL_VGA;
pci_write_config16(bus, PCI_BRIDGE_CONTROL, ctrl);
bus = (bus == bus->bus)? 0 : bus->bus;
bus->bridge_ctrl |= PCI_BRIDGE_CONTROL;
bus = (bus == bus->dev->bus)? 0 : bus->dev->bus;
}
}
@@ -310,36 +389,35 @@ static void allocate_vga_resource(void)
* on this bus.
* @param bus Pointer to the structure for this bus
*/
void assign_resources(struct device *bus)
void assign_resources(struct bus *bus)
{
struct device *curdev;
printk_debug("ASSIGN RESOURCES, bus %d\n", bus->secondary);
for (curdev = bus->children; curdev; curdev = curdev->sibling) {
if (!curdev->ops || !curdev->ops->set_resources) {
printk_err("%s missing set_resources\n",
dev_path(curdev));
continue;
}
curdev->ops->set_resources(curdev);
}
printk_debug("ASSIGNED RESOURCES, bus %d\n", bus->secondary);
}
static void enable_resources(struct device *bus)
void enable_resources(struct device *dev)
{
struct device *curdev;
/* Walk through the chain of all pci devices and enable them.
* This is effectively a breadth first traversal so we should
* not have enalbing ordering problems.
/* Enable the resources for a specific device.
* The parents resources should be enabled first to avoid
* having enabling ordering problems.
*/
for (curdev = all_devices; curdev; curdev = curdev->next) {
uint16_t command;
command = pci_read_config16(curdev, PCI_COMMAND);
command |= curdev->command;
printk_debug("DEV: %02x:%02x.%01x cmd <- %02x\n",
curdev->bus->secondary,
PCI_SLOT(curdev->devfn), PCI_FUNC(curdev->devfn),
command);
pci_write_config16(curdev, PCI_COMMAND, command);
if (!dev->ops || !dev->ops->enable_resources) {
printk_err("%s missing enable_resources\n",
dev_path(dev));
return;
}
dev->ops->enable_resources(dev);
}
/** Enumerate the resources on the PCI by calling pci_init
@@ -347,12 +425,10 @@ static void enable_resources(struct device *bus)
void dev_enumerate(void)
{
struct device *root;
unsigned subordinate;
printk_info("Enumerating buses...");
root = &dev_root;
if (!root->ops) {
root->ops = &default_pci_ops_root;
}
root->subordinate = root->ops->scan_bus(root, 0);
subordinate = root->ops->scan_bus(root, 0);
printk_info("done\n");
}
@@ -394,7 +470,7 @@ void dev_configure(void)
*/
void dev_enable(void)
{
printk_info("Enabling resourcess...");
printk_info("Enabling resourcess...\n");
/* now enable everything. */
enable_resources(&dev_root);
@@ -410,14 +486,10 @@ void dev_initialize(void)
printk_info("Initializing devices...\n");
for (dev = all_devices; dev; dev = dev->next) {
if (dev->ops->init) {
printk_debug("PCI: %02x:%02x.%01x init\n",
dev->bus->secondary,
PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
if (dev->ops && dev->ops->init) {
printk_debug("%s init\n", dev_path(dev));
dev->ops->init(dev);
}
}
printk_info("Devices initialized\n");
}