-/*
- * Misc. support for HP zx1 chipset support
- *
- * Copyright (C) 2002-2003 Hewlett-Packard Co
- * Alex Williamson <alex_williamson@hp.com>
- * Bjorn Helgaas <bjorn_helgaas@hp.com>
- */
-
-
-#include <linux/config.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/pci.h>
-#include <linux/acpi.h>
-#include <linux/efi.h>
-
-#include <asm/dma.h>
-#include <asm/iosapic.h>
-
-extern acpi_status acpi_evaluate_integer (acpi_handle, acpi_string, struct acpi_object_list *,
- unsigned long *);
-
-#define PFX "hpzx1: "
-
-static int hpzx1_devices;
-
-struct fake_pci_dev {
- struct fake_pci_dev *next;
- struct pci_dev *pci_dev;
- unsigned long csr_base;
- unsigned long csr_size;
- unsigned long mapped_csrs; // ioremapped
- int sizing; // in middle of BAR sizing operation?
-} *fake_pci_dev_list;
-
-static struct pci_ops *orig_pci_ops;
-
-struct fake_pci_dev *
-lookup_fake_dev (struct pci_bus *bus, unsigned int devfn)
-{
- struct fake_pci_dev *fake_dev;
-
- for (fake_dev = fake_pci_dev_list; fake_dev; fake_dev = fake_dev->next)
- if (fake_dev->pci_dev->bus == bus && fake_dev->pci_dev->devfn == devfn)
- return fake_dev;
- return NULL;
-}
-
-static int
-hp_cfg_read (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
-{
- struct fake_pci_dev *fake_dev = lookup_fake_dev(bus, devfn);
-
- if (!fake_dev)
- return (*orig_pci_ops->read)(bus, devfn, where, size, value);
-
- if (where == PCI_BASE_ADDRESS_0) {
- if (fake_dev->sizing)
- *value = ~(fake_dev->csr_size - 1);
- else
- *value = ((fake_dev->csr_base & PCI_BASE_ADDRESS_MEM_MASK)
- | PCI_BASE_ADDRESS_SPACE_MEMORY);
- fake_dev->sizing = 0;
- return PCIBIOS_SUCCESSFUL;
- }
- switch (size) {
- case 1: *value = readb(fake_dev->mapped_csrs + where); break;
- case 2: *value = readw(fake_dev->mapped_csrs + where); break;
- case 4: *value = readl(fake_dev->mapped_csrs + where); break;
- default:
- printk(KERN_WARNING"hp_cfg_read: bad size = %d bytes", size);
- break;
- }
- if (where == PCI_COMMAND)
- *value |= PCI_COMMAND_MEMORY; /* SBA omits this */
- return PCIBIOS_SUCCESSFUL;
-}
-
-static int
-hp_cfg_write (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
-{
- struct fake_pci_dev *fake_dev = lookup_fake_dev(bus, devfn);
-
- if (!fake_dev)
- return (*orig_pci_ops->write)(bus, devfn, where, size, value);
-
- if (where == PCI_BASE_ADDRESS_0) {
- if (value == ((1UL << 8*size) - 1))
- fake_dev->sizing = 1;
- return PCIBIOS_SUCCESSFUL;
- }
- switch (size) {
- case 1: writeb(value, fake_dev->mapped_csrs + where); break;
- case 2: writew(value, fake_dev->mapped_csrs + where); break;
- case 4: writel(value, fake_dev->mapped_csrs + where); break;
- default:
- printk(KERN_WARNING"hp_cfg_write: bad size = %d bytes", size);
- break;
- }
- return PCIBIOS_SUCCESSFUL;
-}
-
-static struct pci_ops hp_pci_conf = {
- .read = hp_cfg_read,
- .write = hp_cfg_write
-};
-
-static void
-hpzx1_fake_pci_dev(char *name, unsigned int busnum, unsigned long addr, unsigned int size)
-{
- struct fake_pci_dev *fake;
- int slot, ret;
- struct pci_dev *dev;
- struct pci_bus *b, *bus = NULL;
- u8 hdr;
-
- fake = kmalloc(sizeof(*fake), GFP_KERNEL);
- if (!fake) {
- printk(KERN_ERR PFX "No memory for %s (0x%p) sysdata\n", name, (void *) addr);
- return;
- }
-
- memset(fake, 0, sizeof(*fake));
- fake->csr_base = addr;
- fake->csr_size = size;
- fake->mapped_csrs = (unsigned long) ioremap(addr, size);
- fake->sizing = 0;
-
- pci_for_each_bus(b)
- if (busnum == b->number) {
- bus = b;
- break;
- }
-
- if (!bus) {
- printk(KERN_ERR PFX "No host bus 0x%02x for %s (0x%p)\n",
- busnum, name, (void *) addr);
- kfree(fake);
- return;
- }
-
- for (slot = 0x1e; slot; slot--)
- if (!pci_find_slot(busnum, PCI_DEVFN(slot, 0)))
- break;
-
- if (slot < 0) {
- printk(KERN_ERR PFX "No space for %s (0x%p) on bus 0x%02x\n",
- name, (void *) addr, busnum);
- kfree(fake);
- return;
- }
-
- dev = kmalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev) {
- printk(KERN_ERR PFX "No memory for %s (0x%p)\n", name, (void *) addr);
- kfree(fake);
- return;
- }
-
- bus->ops = &hp_pci_conf; // replace pci ops for this bus
-
- fake->pci_dev = dev;
- fake->next = fake_pci_dev_list;
- fake_pci_dev_list = fake;
-
- memset(dev, 0, sizeof(*dev));
- dev->bus = bus;
- dev->sysdata = fake;
- dev->dev.parent = bus->dev;
- dev->dev.bus = &pci_bus_type;
- dev->devfn = PCI_DEVFN(slot, 0);
- pci_read_config_word(dev, PCI_VENDOR_ID, &dev->vendor);
- pci_read_config_word(dev, PCI_DEVICE_ID, &dev->device);
- pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr);
- dev->hdr_type = hdr & 0x7f;
-
- pci_setup_device(dev);
-
- // pci_insert_device() without running /sbin/hotplug
- list_add_tail(&dev->bus_list, &bus->devices);
- list_add_tail(&dev->global_list, &pci_devices);
-
- strcpy(dev->dev.bus_id, dev->slot_name);
- ret = device_register(&dev->dev);
- if (ret < 0)
- printk(KERN_INFO PFX "fake device registration failed (%d)\n", ret);
-
- printk(KERN_INFO PFX "%s at 0x%lx; pci dev %s\n", name, addr, dev->slot_name);
-
- hpzx1_devices++;
-}
-
-struct acpi_hp_vendor_long {
- u8 guid_id;
- u8 guid[16];
- u8 csr_base[8];
- u8 csr_length[8];
-};
-
-#define HP_CCSR_LENGTH 0x21
-#define HP_CCSR_TYPE 0x2
-#define HP_CCSR_GUID EFI_GUID(0x69e9adf9, 0x924f, 0xab5f, \
- 0xf6, 0x4a, 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad)
-
-extern acpi_status acpi_get_crs(acpi_handle, struct acpi_buffer *);
-extern struct acpi_resource *acpi_get_crs_next(struct acpi_buffer *, int *);
-extern union acpi_resource_data *acpi_get_crs_type(struct acpi_buffer *, int *, int);
-extern void acpi_dispose_crs(struct acpi_buffer *);
-
-static acpi_status
-hp_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length)
-{
- int i, offset = 0;
- acpi_status status;
- struct acpi_buffer buf;
- struct acpi_resource_vendor *res;
- struct acpi_hp_vendor_long *hp_res;
- efi_guid_t vendor_guid;
-
- *csr_base = 0;
- *csr_length = 0;
-
- status = acpi_get_crs(obj, &buf);
- if (ACPI_FAILURE(status)) {
- printk(KERN_ERR PFX "Unable to get _CRS data on object\n");
- return status;
- }
-
- res = (struct acpi_resource_vendor *)acpi_get_crs_type(&buf, &offset, ACPI_RSTYPE_VENDOR);
- if (!res) {
- printk(KERN_ERR PFX "Failed to find config space for device\n");
- acpi_dispose_crs(&buf);
- return AE_NOT_FOUND;
- }
-
- hp_res = (struct acpi_hp_vendor_long *)(res->reserved);
-
- if (res->length != HP_CCSR_LENGTH || hp_res->guid_id != HP_CCSR_TYPE) {
- printk(KERN_ERR PFX "Unknown Vendor data\n");
- acpi_dispose_crs(&buf);
- return AE_TYPE; /* Revisit error? */
- }
-
- memcpy(&vendor_guid, hp_res->guid, sizeof(efi_guid_t));
- if (efi_guidcmp(vendor_guid, HP_CCSR_GUID) != 0) {
- printk(KERN_ERR PFX "Vendor GUID does not match\n");
- acpi_dispose_crs(&buf);
- return AE_TYPE; /* Revisit error? */
- }
-
- for (i = 0 ; i < 8 ; i++) {
- *csr_base |= ((u64)(hp_res->csr_base[i]) << (i * 8));
- *csr_length |= ((u64)(hp_res->csr_length[i]) << (i * 8));
- }
-
- acpi_dispose_crs(&buf);
-
- return AE_OK;
-}
-
-static acpi_status
-hpzx1_sba_probe(acpi_handle obj, u32 depth, void *context, void **ret)
-{
- u64 csr_base = 0, csr_length = 0;
- acpi_status status;
- char *name = context;
- char fullname[16];
-
- status = hp_csr_space(obj, &csr_base, &csr_length);
- if (ACPI_FAILURE(status))
- return status;
-
- /*
- * Only SBA shows up in ACPI namespace, so its CSR space
- * includes both SBA and IOC. Make SBA and IOC show up
- * separately in PCI space.
- */
- sprintf(fullname, "%s SBA", name);
- hpzx1_fake_pci_dev(fullname, 0, csr_base, 0x1000);
- sprintf(fullname, "%s IOC", name);
- hpzx1_fake_pci_dev(fullname, 0, csr_base + 0x1000, 0x1000);
-
- return AE_OK;
-}
-
-static acpi_status
-hpzx1_lba_probe(acpi_handle obj, u32 depth, void *context, void **ret)
-{
- u64 csr_base = 0, csr_length = 0;
- acpi_status status;
- acpi_native_uint busnum;
- char *name = context;
- char fullname[32];
-
- status = hp_csr_space(obj, &csr_base, &csr_length);
- if (ACPI_FAILURE(status))
- return status;
-
- status = acpi_evaluate_integer(obj, METHOD_NAME__BBN, NULL, &busnum);
- if (ACPI_FAILURE(status)) {
- printk(KERN_WARNING PFX "evaluate _BBN fail=0x%x\n", status);
- busnum = 0; // no _BBN; stick it on bus 0
- }
-
- sprintf(fullname, "%s _BBN 0x%02x", name, (unsigned int) busnum);
- hpzx1_fake_pci_dev(fullname, busnum, csr_base, csr_length);
-
- return AE_OK;
-}
-
-static void
-hpzx1_acpi_dev_init(void)
-{
- extern struct pci_ops *pci_root_ops;
-
- orig_pci_ops = pci_root_ops;
-
- /*
- * Make fake PCI devices for the following hardware in the
- * ACPI namespace. This makes it more convenient for drivers
- * because they can claim these devices based on PCI
- * information, rather than needing to know about ACPI. The
- * 64-bit "HPA" space for this hardware is available as BAR
- * 0/1.
- *
- * HWP0001: Single IOC SBA w/o IOC in namespace
- * HWP0002: LBA device
- * HWP0003: AGP LBA device
- */
- acpi_get_devices("HWP0001", hpzx1_sba_probe, "HWP0001", NULL);
- acpi_get_devices("HWP0002", hpzx1_lba_probe, "HWP0002 PCI LBA", NULL);
- acpi_get_devices("HWP0003", hpzx1_lba_probe, "HWP0003 AGP LBA", NULL);
-}
-
-extern void sba_init(void);
-
-static int
-hpzx1_init (void)
-{
- /* zx1 has a hardware I/O TLB which lets us DMA from any device to any address */
- MAX_DMA_ADDRESS = ~0UL;
-
- hpzx1_acpi_dev_init();
- sba_init();
- return 0;
-}
-
-subsys_initcall(hpzx1_init);
projects / linux-flexiantxendom0-3.2.10.git / commitdiff