pci.c
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上传日期:2013-04-10
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文件大小:8k
- /*
- *
- * SNI64 specific PCI support for SNI IO.
- *
- * 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) 1997, 1998, 2000-2002 Silicon Graphics, Inc. All rights reserved.
- */
- #include <linux/init.h>
- #include <linux/types.h>
- #include <linux/config.h>
- #include <linux/pci.h>
- #include <asm/sn/types.h>
- #include <asm/sn/sgi.h>
- #include <asm/sn/io.h>
- #include <asm/sn/driver.h>
- #include <asm/sn/iograph.h>
- #include <asm/param.h>
- #include <asm/sn/pio.h>
- #include <asm/sn/xtalk/xwidget.h>
- #include <asm/sn/sn_private.h>
- #include <asm/sn/addrs.h>
- #include <asm/sn/invent.h>
- #include <asm/sn/hcl.h>
- #include <asm/sn/hcl_util.h>
- #include <asm/sn/pci/pciio.h>
- #include <asm/sn/pci/pcibr.h>
- #include <asm/sn/pci/pcibr_private.h>
- #include <asm/sn/pci/bridge.h>
- #ifdef DEBUG_CONFIG
- #define DBG(x...) printk(x)
- #else
- #define DBG(x...)
- #endif
- #ifdef CONFIG_PCI
- extern devfs_handle_t pci_bus_to_vertex(unsigned char);
- extern devfs_handle_t devfn_to_vertex(unsigned char bus, unsigned char devfn);
- /*
- * snia64_read_config_byte - Read a byte from the config area of the device.
- */
- static int snia64_read_config_byte (struct pci_dev *dev,
- int where, unsigned char *val)
- {
- unsigned long res = 0;
- unsigned size = 1;
- devfs_handle_t device_vertex;
- if ( (dev == (struct pci_dev *)0) || (val == (unsigned char *)0) ) {
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- device_vertex = devfn_to_vertex(dev->bus->number, dev->devfn);
- if (!device_vertex) {
- DBG("%s : nonexistent device: bus= 0x%x slot= 0x%x func= 0x%xn",
- __FUNCTION__, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
- return(-1);
- }
- res = pciio_config_get(device_vertex, (unsigned) where, size);
- *val = (unsigned char) res;
- return PCIBIOS_SUCCESSFUL;
- }
- /*
- * snia64_read_config_word - Read 2 bytes from the config area of the device.
- */
- static int snia64_read_config_word (struct pci_dev *dev,
- int where, unsigned short *val)
- {
- unsigned long res = 0;
- unsigned size = 2; /* 2 bytes */
- devfs_handle_t device_vertex;
- if ( (dev == (struct pci_dev *)0) || (val == (unsigned short *)0) ) {
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- device_vertex = devfn_to_vertex(dev->bus->number, dev->devfn);
- if (!device_vertex) {
- DBG("%s : nonexistent device: bus= 0x%x slot= 0x%x func= 0x%xn",
- __FUNCTION__, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
- return(-1);
- }
- res = pciio_config_get(device_vertex, (unsigned) where, size);
- *val = (unsigned short) res;
- return PCIBIOS_SUCCESSFUL;
- }
- /*
- * snia64_read_config_dword - Read 4 bytes from the config area of the device.
- */
- static int snia64_read_config_dword (struct pci_dev *dev,
- int where, unsigned int *val)
- {
- unsigned long res = 0;
- unsigned size = 4; /* 4 bytes */
- devfs_handle_t device_vertex;
- if (where & 3) {
- return PCIBIOS_BAD_REGISTER_NUMBER;
- }
- if ( (dev == (struct pci_dev *)0) || (val == (unsigned int *)0) ) {
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- device_vertex = devfn_to_vertex(dev->bus->number, dev->devfn);
- if (!device_vertex) {
- DBG("%s : nonexistent device: bus= 0x%x slot= 0x%x func= 0x%xn",
- __FUNCTION__, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
- return(-1);
- }
- res = pciio_config_get(device_vertex, (unsigned) where, size);
- *val = (unsigned int) res;
- return PCIBIOS_SUCCESSFUL;
- }
- /*
- * snia64_write_config_byte - Writes 1 byte to the config area of the device.
- */
- static int snia64_write_config_byte (struct pci_dev *dev,
- int where, unsigned char val)
- {
- devfs_handle_t device_vertex;
- if ( dev == (struct pci_dev *)0 ) {
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- /*
- * if it's an IOC3 then we bail out, we special
- * case them with pci_fixup_ioc3
- */
- if (dev->vendor == PCI_VENDOR_ID_SGI &&
- dev->device == PCI_DEVICE_ID_SGI_IOC3 )
- return PCIBIOS_SUCCESSFUL;
- device_vertex = devfn_to_vertex(dev->bus->number, dev->devfn);
- if (!device_vertex) {
- DBG("%s : nonexistent device: bus= 0x%x slot= 0x%x func= 0x%xn",
- __FUNCTION__, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
- return(-1);
- }
- pciio_config_set( device_vertex, (unsigned)where, 1, (uint64_t) val);
- return PCIBIOS_SUCCESSFUL;
- }
- /*
- * snia64_write_config_word - Writes 2 bytes to the config area of the device.
- */
- static int snia64_write_config_word (struct pci_dev *dev,
- int where, unsigned short val)
- {
- devfs_handle_t device_vertex = NULL;
- if (where & 1) {
- return PCIBIOS_BAD_REGISTER_NUMBER;
- }
- if ( dev == (struct pci_dev *)0 ) {
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- /*
- * if it's an IOC3 then we bail out, we special
- * case them with pci_fixup_ioc3
- */
- if (dev->vendor == PCI_VENDOR_ID_SGI &&
- dev->device == PCI_DEVICE_ID_SGI_IOC3)
- return PCIBIOS_SUCCESSFUL;
- device_vertex = devfn_to_vertex(dev->bus->number, dev->devfn);
- if (!device_vertex) {
- DBG("%s : nonexistent device: bus= 0x%x slot= 0x%x func= 0x%xn",
- __FUNCTION__, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
- return(-1);
- }
- pciio_config_set( device_vertex, (unsigned)where, 2, (uint64_t) val);
- return PCIBIOS_SUCCESSFUL;
- }
- /*
- * snia64_write_config_dword - Writes 4 bytes to the config area of the device.
- */
- static int snia64_write_config_dword (struct pci_dev *dev,
- int where, unsigned int val)
- {
- devfs_handle_t device_vertex;
- if (where & 3) {
- return PCIBIOS_BAD_REGISTER_NUMBER;
- }
- if ( dev == (struct pci_dev *)0 ) {
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- /*
- * if it's an IOC3 then we bail out, we special
- * case them with pci_fixup_ioc3
- */
- if (dev->vendor == PCI_VENDOR_ID_SGI &&
- dev->device == PCI_DEVICE_ID_SGI_IOC3)
- return PCIBIOS_SUCCESSFUL;
- device_vertex = devfn_to_vertex(dev->bus->number, dev->devfn);
- if (!device_vertex) {
- DBG("%s : nonexistent device: bus= 0x%x slot= 0x%x func= 0x%xn",
- __FUNCTION__, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
- return(-1);
- }
- pciio_config_set( device_vertex, (unsigned)where, 4, (uint64_t) val);
- return PCIBIOS_SUCCESSFUL;
- }
- static struct pci_ops snia64_pci_ops = {
- snia64_read_config_byte,
- snia64_read_config_word,
- snia64_read_config_dword,
- snia64_write_config_byte,
- snia64_write_config_word,
- snia64_write_config_dword
- };
- /*
- * snia64_pci_find_bios - SNIA64 pci_find_bios() platform specific code.
- */
- void __init
- sn_pci_find_bios(void)
- {
- extern struct pci_ops pci_conf;
- /*
- * Go initialize our IO Infrastructure ..
- */
- extern void sgi_master_io_infr_init(void);
- sgi_master_io_infr_init();
- /* sn_io_infrastructure_init(); */
- pci_conf = snia64_pci_ops;
- }
- void
- pci_fixup_ioc3(struct pci_dev *d)
- {
- int i;
- unsigned int size;
- /* IOC3 only decodes 0x20 bytes of the config space, reading
- * beyond that is relatively benign but writing beyond that
- * (especially the base address registers) will shut down the
- * pci bus...so avoid doing so.
- * NOTE: this means we can't program the intr_pin into the device,
- * currently we hack this with special code in
- * sgi_pci_intr_support()
- */
- DBG("pci_fixup_ioc3: Fixing base addresses for ioc3 device %sn", d->slot_name);
- /* I happen to know from the spec that the ioc3 needs only 0xfffff
- * The standard pci trick of writing ~0 to the baddr and seeing
- * what comes back doesn't work with the ioc3
- */
- size = 0xfffff;
- d->resource[0].end = (unsigned long) d->resource[0].start + (unsigned long) size;
- /*
- * Zero out the resource structure .. because we did not go through
- * the normal PCI Infrastructure Init, garbbage are left in these
- * fileds.
- */
- for (i = 1; i <= PCI_ROM_RESOURCE; i++) {
- d->resource[i].start = 0UL;
- d->resource[i].end = 0UL;
- d->resource[i].flags = 0UL;
- }
- /*
- * Hardcode Device 4 register(IOC3 is in Slot 4) to set the
- * DEV_DIRECT bit. This will not work if IOC3 is not on Slot
- * 4.
- */
- DBG("pci_fixup_ioc3: FIXME .. need to take NASID into account when setting IOC3 devreg 0x%xn", *(volatile u32 *)0xc0000a000f000220);
- *(volatile u32 *)0xc0000a000f000220 |= 0x90000;
- d->subsystem_vendor = 0;
- d->subsystem_device = 0;
- }
- #else
- void sn_pci_find_bios(void) {}
- void pci_fixup_ioc3(struct pci_dev *d) {}
- struct list_head pci_root_buses;
- struct list_head pci_root_buses;
- struct list_head pci_devices;
- #endif /* CONFIG_PCI */