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linux/arch/ia64/sn/kernel/io_acpi_init.c

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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2006 Silicon Graphics, Inc. All rights reserved.
*/
#include <asm/sn/types.h>
#include <asm/sn/addrs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/sn_sal.h>
#include "xtalk/hubdev.h"
#include <linux/acpi.h>
#include <linux/slab.h>
#include <linux/export.h>
/*
* The code in this file will only be executed when running with
* a PROM that has ACPI IO support. (i.e., SN_ACPI_BASE_SUPPORT() == 1)
*/
/*
* This value must match the UUID the PROM uses
* (io/acpi/defblk.c) when building a vendor descriptor.
*/
struct acpi_vendor_uuid sn_uuid = {
.subtype = 0,
.data = { 0x2c, 0xc6, 0xa6, 0xfe, 0x9c, 0x44, 0xda, 0x11,
0xa2, 0x7c, 0x08, 0x00, 0x69, 0x13, 0xea, 0x51 },
};
struct sn_pcidev_match {
u8 bus;
unsigned int devfn;
acpi_handle handle;
};
/*
* Perform the early IO init in PROM.
*/
static long
sal_ioif_init(u64 *result)
{
struct ia64_sal_retval isrv = {0,0,0,0};
SAL_CALL_NOLOCK(isrv,
SN_SAL_IOIF_INIT, 0, 0, 0, 0, 0, 0, 0);
*result = isrv.v0;
return isrv.status;
}
/*
* sn_acpi_hubdev_init() - This function is called by acpi_ns_get_device_callback()
* for all SGIHUB and SGITIO acpi devices defined in the
* DSDT. It obtains the hubdev_info pointer from the
* ACPI vendor resource, which the PROM setup, and sets up the
* hubdev_info in the pda.
*/
static acpi_status __init
sn_acpi_hubdev_init(acpi_handle handle, u32 depth, void *context, void **ret)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
u64 addr;
struct hubdev_info *hubdev;
struct hubdev_info *hubdev_ptr;
int i;
u64 nasid;
struct acpi_resource *resource;
acpi_status status;
struct acpi_resource_vendor_typed *vendor;
extern void sn_common_hubdev_init(struct hubdev_info *);
status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
&sn_uuid, &buffer);
if (ACPI_FAILURE(status)) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
printk(KERN_ERR
"sn_acpi_hubdev_init: acpi_get_vendor_resource() "
"(0x%x) failed for: %s\n", status,
(char *)name_buffer.pointer);
kfree(name_buffer.pointer);
return AE_OK; /* Continue walking namespace */
}
resource = buffer.pointer;
vendor = &resource->data.vendor_typed;
if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
sizeof(struct hubdev_info *)) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
printk(KERN_ERR
"sn_acpi_hubdev_init: Invalid vendor data length: "
"%d for: %s\n",
vendor->byte_length, (char *)name_buffer.pointer);
kfree(name_buffer.pointer);
goto exit;
}
memcpy(&addr, vendor->byte_data, sizeof(struct hubdev_info *));
hubdev_ptr = __va((struct hubdev_info *) addr);
nasid = hubdev_ptr->hdi_nasid;
i = nasid_to_cnodeid(nasid);
hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
*hubdev = *hubdev_ptr;
sn_common_hubdev_init(hubdev);
exit:
kfree(buffer.pointer);
return AE_OK; /* Continue walking namespace */
}
/*
* sn_get_bussoft_ptr() - The pcibus_bussoft pointer is found in
* the ACPI Vendor resource for this bus.
*/
static struct pcibus_bussoft *
sn_get_bussoft_ptr(struct pci_bus *bus)
{
u64 addr;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_handle handle;
struct pcibus_bussoft *prom_bussoft_ptr;
struct acpi_resource *resource;
acpi_status status;
struct acpi_resource_vendor_typed *vendor;
handle = acpi_device_handle(PCI_CONTROLLER(bus)->companion);
status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
&sn_uuid, &buffer);
if (ACPI_FAILURE(status)) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
printk(KERN_ERR "%s: "
"acpi_get_vendor_resource() failed (0x%x) for: %s\n",
__func__, status, (char *)name_buffer.pointer);
kfree(name_buffer.pointer);
return NULL;
}
resource = buffer.pointer;
vendor = &resource->data.vendor_typed;
if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
sizeof(struct pcibus_bussoft *)) {
printk(KERN_ERR
"%s: Invalid vendor data length %d\n",
__func__, vendor->byte_length);
kfree(buffer.pointer);
return NULL;
}
memcpy(&addr, vendor->byte_data, sizeof(struct pcibus_bussoft *));
prom_bussoft_ptr = __va((struct pcibus_bussoft *) addr);
kfree(buffer.pointer);
return prom_bussoft_ptr;
}
/*
* sn_extract_device_info - Extract the pcidev_info and the sn_irq_info
* pointers from the vendor resource using the
* provided acpi handle, and copy the structures
* into the argument buffers.
*/
static int
sn_extract_device_info(acpi_handle handle, struct pcidev_info **pcidev_info,
struct sn_irq_info **sn_irq_info)
{
u64 addr;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct sn_irq_info *irq_info, *irq_info_prom;
struct pcidev_info *pcidev_ptr, *pcidev_prom_ptr;
struct acpi_resource *resource;
int ret = 0;
acpi_status status;
struct acpi_resource_vendor_typed *vendor;
/*
* The pointer to this device's pcidev_info structure in
* the PROM, is in the vendor resource.
*/
status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
&sn_uuid, &buffer);
if (ACPI_FAILURE(status)) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
printk(KERN_ERR
"%s: acpi_get_vendor_resource() failed (0x%x) for: %s\n",
__func__, status, (char *)name_buffer.pointer);
kfree(name_buffer.pointer);
return 1;
}
resource = buffer.pointer;
vendor = &resource->data.vendor_typed;
if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
sizeof(struct pci_devdev_info *)) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
printk(KERN_ERR
"%s: Invalid vendor data length: %d for: %s\n",
__func__, vendor->byte_length,
(char *)name_buffer.pointer);
kfree(name_buffer.pointer);
ret = 1;
goto exit;
}
pcidev_ptr = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
if (!pcidev_ptr)
panic("%s: Unable to alloc memory for pcidev_info", __func__);
memcpy(&addr, vendor->byte_data, sizeof(struct pcidev_info *));
pcidev_prom_ptr = __va(addr);
memcpy(pcidev_ptr, pcidev_prom_ptr, sizeof(struct pcidev_info));
/* Get the IRQ info */
irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
if (!irq_info)
panic("%s: Unable to alloc memory for sn_irq_info", __func__);
if (pcidev_ptr->pdi_sn_irq_info) {
irq_info_prom = __va(pcidev_ptr->pdi_sn_irq_info);
memcpy(irq_info, irq_info_prom, sizeof(struct sn_irq_info));
}
*pcidev_info = pcidev_ptr;
*sn_irq_info = irq_info;
exit:
kfree(buffer.pointer);
return ret;
}
static unsigned int
get_host_devfn(acpi_handle device_handle, acpi_handle rootbus_handle)
{
unsigned long long adr;
acpi_handle child;
unsigned int devfn;
int function;
acpi_handle parent;
int slot;
acpi_status status;
struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_get_name(device_handle, ACPI_FULL_PATHNAME, &name_buffer);
/*
* Do an upward search to find the root bus device, and
* obtain the host devfn from the previous child device.
*/
child = device_handle;
while (child) {
status = acpi_get_parent(child, &parent);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR "%s: acpi_get_parent() failed "
"(0x%x) for: %s\n", __func__, status,
(char *)name_buffer.pointer);
panic("%s: Unable to find host devfn\n", __func__);
}
if (parent == rootbus_handle)
break;
child = parent;
}
if (!child) {
printk(KERN_ERR "%s: Unable to find root bus for: %s\n",
__func__, (char *)name_buffer.pointer);
BUG();
}
status = acpi_evaluate_integer(child, METHOD_NAME__ADR, NULL, &adr);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR "%s: Unable to get _ADR (0x%x) for: %s\n",
__func__, status, (char *)name_buffer.pointer);
panic("%s: Unable to find host devfn\n", __func__);
}
kfree(name_buffer.pointer);
slot = (adr >> 16) & 0xffff;
function = adr & 0xffff;
devfn = PCI_DEVFN(slot, function);
return devfn;
}
/*
* find_matching_device - Callback routine to find the ACPI device
* that matches up with our pci_dev device.
* Matching is done on bus number and devfn.
* To find the bus number for a particular
* ACPI device, we must look at the _BBN method
* of its parent.
*/
static acpi_status
find_matching_device(acpi_handle handle, u32 lvl, void *context, void **rv)
{
unsigned long long bbn = -1;
unsigned long long adr;
acpi_handle parent = NULL;
acpi_status status;
unsigned int devfn;
int function;
int slot;
struct sn_pcidev_match *info = context;
struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
&adr);
if (ACPI_SUCCESS(status)) {
status = acpi_get_parent(handle, &parent);
if (ACPI_FAILURE(status)) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
printk(KERN_ERR
"%s: acpi_get_parent() failed (0x%x) for: %s\n",
__func__, status, (char *)name_buffer.pointer);
kfree(name_buffer.pointer);
return AE_OK;
}
status = acpi_evaluate_integer(parent, METHOD_NAME__BBN,
NULL, &bbn);
if (ACPI_FAILURE(status)) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
printk(KERN_ERR
"%s: Failed to find _BBN in parent of: %s\n",
__func__, (char *)name_buffer.pointer);
kfree(name_buffer.pointer);
return AE_OK;
}
slot = (adr >> 16) & 0xffff;
function = adr & 0xffff;
devfn = PCI_DEVFN(slot, function);
if ((info->devfn == devfn) && (info->bus == bbn)) {
/* We have a match! */
info->handle = handle;
return 1;
}
}
return AE_OK;
}
/*
* sn_acpi_get_pcidev_info - Search ACPI namespace for the acpi
* device matching the specified pci_dev,
* and return the pcidev info and irq info.
*/
int
sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info,
struct sn_irq_info **sn_irq_info)
{
unsigned int host_devfn;
struct sn_pcidev_match pcidev_match;
acpi_handle rootbus_handle;
unsigned long long segment;
acpi_status status;
struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
rootbus_handle = acpi_device_handle(PCI_CONTROLLER(dev)->companion);
status = acpi_evaluate_integer(rootbus_handle, METHOD_NAME__SEG, NULL,
&segment);
if (ACPI_SUCCESS(status)) {
if (segment != pci_domain_nr(dev)) {
acpi_get_name(rootbus_handle, ACPI_FULL_PATHNAME,
&name_buffer);
printk(KERN_ERR
"%s: Segment number mismatch, 0x%llx vs 0x%x for: %s\n",
__func__, segment, pci_domain_nr(dev),
(char *)name_buffer.pointer);
kfree(name_buffer.pointer);
return 1;
}
} else {
acpi_get_name(rootbus_handle, ACPI_FULL_PATHNAME, &name_buffer);
printk(KERN_ERR "%s: Unable to get __SEG from: %s\n",
__func__, (char *)name_buffer.pointer);
kfree(name_buffer.pointer);
return 1;
}
/*
* We want to search all devices in this segment/domain
* of the ACPI namespace for the matching ACPI device,
* which holds the pcidev_info pointer in its vendor resource.
*/
pcidev_match.bus = dev->bus->number;
pcidev_match.devfn = dev->devfn;
pcidev_match.handle = NULL;
acpi_walk_namespace(ACPI_TYPE_DEVICE, rootbus_handle, ACPI_UINT32_MAX,
find_matching_device, NULL, &pcidev_match, NULL);
if (!pcidev_match.handle) {
printk(KERN_ERR
"%s: Could not find matching ACPI device for %s.\n",
__func__, pci_name(dev));
return 1;
}
if (sn_extract_device_info(pcidev_match.handle, pcidev_info, sn_irq_info))
return 1;
/* Build up the pcidev_info.pdi_slot_host_handle */
host_devfn = get_host_devfn(pcidev_match.handle, rootbus_handle);
(*pcidev_info)->pdi_slot_host_handle =
((unsigned long) pci_domain_nr(dev) << 40) |
/* bus == 0 */
host_devfn;
return 0;
}
/*
* sn_acpi_slot_fixup - Obtain the pcidev_info and sn_irq_info.
* Perform any SN specific slot fixup.
* At present there does not appear to be
* any generic way to handle a ROM image
* that has been shadowed by the PROM, so
* we pass a pointer to it within the
* pcidev_info structure.
*/
void
sn_acpi_slot_fixup(struct pci_dev *dev)
{
struct pcidev_info *pcidev_info = NULL;
struct sn_irq_info *sn_irq_info = NULL;
struct resource *res;
size_t size;
if (sn_acpi_get_pcidev_info(dev, &pcidev_info, &sn_irq_info)) {
panic("%s: Failure obtaining pcidev_info for %s\n",
__func__, pci_name(dev));
}
if (pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE]) {
/*
* A valid ROM image exists and has been shadowed by the
* PROM. Setup the pci_dev ROM resource with the address
* of the shadowed copy, and the actual length of the ROM image.
*/
size = pci_resource_len(dev, PCI_ROM_RESOURCE);
res = &dev->resource[PCI_ROM_RESOURCE];
pci_disable_rom(dev);
if (res->parent)
release_resource(res);
res->start = pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE];
res->end = res->start + size - 1;
res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
IORESOURCE_PCI_FIXED;
}
sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
}
EXPORT_SYMBOL(sn_acpi_slot_fixup);
/*
* sn_acpi_bus_fixup - Perform SN specific setup of software structs
* (pcibus_bussoft, pcidev_info) and hardware
* registers, for the specified bus and devices under it.
*/
void
sn_acpi_bus_fixup(struct pci_bus *bus)
{
struct pci_dev *pci_dev = NULL;
struct pcibus_bussoft *prom_bussoft_ptr;
if (!bus->parent) { /* If root bus */
prom_bussoft_ptr = sn_get_bussoft_ptr(bus);
if (prom_bussoft_ptr == NULL) {
printk(KERN_ERR
"%s: 0x%04x:0x%02x Unable to "
"obtain prom_bussoft_ptr\n",
__func__, pci_domain_nr(bus), bus->number);
return;
}
sn_common_bus_fixup(bus, prom_bussoft_ptr);
}
list_for_each_entry(pci_dev, &bus->devices, bus_list) {
sn_acpi_slot_fixup(pci_dev);
}
}
/*
* sn_io_acpi_init - PROM has ACPI support for IO, defining at a minimum the
* nodes and root buses in the DSDT. As a result, bus scanning
* will be initiated by the Linux ACPI code.
*/
void __init
sn_io_acpi_init(void)
{
u64 result;
long status;
/* SN Altix does not follow the IOSAPIC IRQ routing model */
acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
/* Setup hubdev_info for all SGIHUB/SGITIO devices */
acpi_get_devices("SGIHUB", sn_acpi_hubdev_init, NULL, NULL);
acpi_get_devices("SGITIO", sn_acpi_hubdev_init, NULL, NULL);
status = sal_ioif_init(&result);
if (status || result)
panic("sal_ioif_init failed: [%lx] %s\n",
status, ia64_sal_strerror(status));
}
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