/*
* 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) 1999, 2000 Ralf Baechle (ralf@gnu.org)
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <asm/sn/arch.h>
#include <asm/pci/bridge.h>
#include <asm/paccess.h>
#include <asm/sn/sn0/ip27.h>
#include <asm/sn/sn0/hub.h>
/*
* Max #PCI busses we can handle; ie, max #PCI bridges.
*/
#define MAX_PCI_BUSSES 40
/*
* Max #PCI devices (like scsi controllers) we handle on a bus.
*/
#define MAX_DEVICES_PER_PCIBUS 8
/*
* No locking needed until PCI initialization is done parallely.
*/
int irqstore[MAX_PCI_BUSSES][MAX_DEVICES_PER_PCIBUS];
int lastirq = BASE_PCI_IRQ;
/*
* Translate from irq to software PCI bus number and PCI slot.
*/
int irq_to_bus[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
int irq_to_slot[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
/*
* The Bridge ASIC supports both type 0 and type 1 access. Type 1 is
* not really documented, so right now I can't write code which uses it.
* Therefore we use type 0 accesses for now even though they won't work
* correcly for PCI-to-PCI bridges.
*/
#define CF0_READ_PCI_CFG(bus,devfn,where,value,bm,mask) \
do { \
bridge_t *bridge; \
int slot = PCI_SLOT(devfn); \
int fn = PCI_FUNC(devfn); \
volatile u32 *addr; \
u32 cf, __bit; \
unsigned int bus_id = (unsigned) bus->number; \
\
bridge = (bridge_t *) NODE_SWIN_BASE(bus_to_nid[bus_id], \
bus_to_wid[bus_id]); \
\
__bit = (((where) & (bm)) << 3); \
addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2]; \
if (get_dbe(cf, addr)) \
return PCIBIOS_DEVICE_NOT_FOUND; \
*value = (cf >> __bit) & (mask); \
return PCIBIOS_SUCCESSFUL; \
} while (0)
static int pci_conf0_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 * value)
{
u32 vprod;
CF0_READ_PCI_CFG(bus, devfn, PCI_VENDOR_ID, &vprod, 0, 0xffffffff);
if (vprod == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))
&& ((where >= 0x14 && where < 0x40) || (where >= 0x48))) {
*value = 0;
return PCIBIOS_SUCCESSFUL;
}
if (size == 1)
CF0_READ_PCI_CFG(bus, devfn, where, (u8 *) value, 3, 0xff);
else if (size == 2)
CF0_READ_PCI_CFG(bus, devfn, where, (u16 *) value, 2,
0xffff);
else
CF0_READ_PCI_CFG(bus, devfn, where, (u32 *) value, 0,
0xffffffff);
}
#define CF0_WRITE_PCI_CFG(bus,devfn,where,value,bm,mask) \
do { \
bridge_t *bridge; \
int slot = PCI_SLOT(devfn); \
int fn = PCI_FUNC(devfn); \
volatile u32 *addr; \
u32 cf, __bit; \
unsigned int bus_id = (unsigned) bus->number; \
\
bridge = (bridge_t *) NODE_SWIN_BASE(bus_to_nid[bus_id], \
bus_to_wid[bus_id]); \
\
__bit = (((where) & (bm)) << 3); \
addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2]; \
if (get_dbe(cf, addr)) \
return PCIBIOS_DEVICE_NOT_FOUND; \
cf &= (~mask); \
cf |= (value); \
put_dbe(cf, addr); \
return PCIBIOS_SUCCESSFUL; \
} while (0)
static int pci_conf0_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 value)
{
u32 vprod;
CF0_READ_PCI_CFG(bus, devfn, PCI_VENDOR_ID, &vprod, 0, 0xffffffff);
if (vprod == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))
&& ((where >= 0x14 && where < 0x40) || (where >= 0x48))) {
return PCIBIOS_SUCCESSFUL;
}
if (size == 1)
CF0_WRITE_PCI_CFG(bus, devfn, where, (u8) value, 3, 0xff);
else if (size == 2)
CF0_WRITE_PCI_CFG(bus, devfn, where, (u16) value, 2,
0xffff);
else
CF0_WRITE_PCI_CFG(bus, devfn, where, (u32) value, 0,
0xffffffff);
}
static struct pci_ops bridge_pci_ops = {
.read = pci_conf0_read_config,
.write = pci_conf0_write_config,
};
static int __init pcibios_init(void)
{
struct pci_ops *ops = &bridge_pci_ops;
int i;
ioport_resource.end = ~0UL;
for (i = 0; i < num_bridges; i++) {
printk("PCI: Probing PCI hardware on host bus %2d.\n", i);
pci_scan_bus(i, ops, NULL);
}
return 0;
}
subsys_initcall(pcibios_init);
static inline u8 bridge_swizzle(u8 pin, u8 slot)
{
return (((pin - 1) + slot) % 4) + 1;
}
static u8 __devinit pci_swizzle(struct pci_dev *dev, u8 * pinp)
{
u8 pin = *pinp;
while (dev->bus->self) { /* Move up the chain of bridges. */
pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
dev = dev->bus->self;
}
*pinp = pin;
return PCI_SLOT(dev->devfn);
}
/*
* All observed requests have pin == 1. We could have a global here, that
* gets incremented and returned every time - unfortunately, pci_map_irq
* may be called on the same device over and over, and need to return the
* same value. On O2000, pin can be 0 or 1, and PCI slots can be [0..7].
*
* A given PCI device, in general, should be able to intr any of the cpus
* on any one of the hubs connected to its xbow.
*/
static int __devinit pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
if ((dev->bus->number >= MAX_PCI_BUSSES)
|| (pin != 1)
|| (slot >= MAX_DEVICES_PER_PCIBUS))
panic("Increase supported PCI busses %d,%d,%d",
dev->bus->number, slot, pin);
/*
* Already assigned? Then return previously assigned value ...
*/
if (irqstore[dev->bus->number][slot])
return irqstore[dev->bus->number][slot];
irq_to_bus[lastirq] = dev->bus->number;
irq_to_slot[lastirq] = slot;
irqstore[dev->bus->number][slot] = lastirq;
lastirq++;
return lastirq - 1;
}
void __init pcibios_update_irq(struct pci_dev *dev, int irq)
{
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
}
void __devinit pcibios_fixup_bus(struct pci_bus *b)
{
pci_fixup_irqs(pci_swizzle, pci_map_irq);
}
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
/* Not needed, since we enable all devices at startup. */
return 0;
}
void pcibios_align_resource(void *data, struct resource *res,
unsigned long size, unsigned long align)
{
}
unsigned int pcibios_assign_all_busses(void)
{
return 0;
}
char *__devinit pcibios_setup(char *str)
{
/* Nothing to do for now. */
return str;
}
/*
* Device might live on a subordinate PCI bus. XXX Walk up the chain of buses
* to find the slot number in sense of the bridge device register.
* XXX This also means multiple devices might rely on conflicting bridge
* settings.
*/
static void __init pci_disable_swapping(struct pci_dev *dev)
{
unsigned int bus_id = (unsigned) dev->bus->number;
bridge_t *bridge = (bridge_t *) NODE_SWIN_BASE(bus_to_nid[bus_id],
bus_to_wid[bus_id]);
int slot = PCI_SLOT(dev->devfn);
/* Turn off byte swapping */
bridge->b_device[slot].reg &= ~BRIDGE_DEV_SWAP_DIR;
bridge->b_widget.w_tflush; /* Flush */
}
static void __init pci_enable_swapping(struct pci_dev *dev)
{
unsigned int bus_id = (unsigned) dev->bus->number;
bridge_t *bridge = (bridge_t *) NODE_SWIN_BASE(bus_to_nid[bus_id],
bus_to_wid[bus_id]);
int slot = PCI_SLOT(dev->devfn);
/* Turn on byte swapping */
bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR;
bridge->b_widget.w_tflush; /* Flush */
}
static void __init pci_fixup_ioc3(struct pci_dev *d)
{
unsigned long bus_id = (unsigned) d->bus->number;
printk("PCI: Fixing base addresses for IOC3 device %s\n",
pci_name(d));
d->resource[0].start |= NODE_OFFSET(bus_to_nid[bus_id]);
d->resource[0].end |= NODE_OFFSET(bus_to_nid[bus_id]);
pci_disable_swapping(d);
}
static void __init pci_fixup_isp1020(struct pci_dev *d)
{
unsigned short command;
d->resource[0].start |=
((unsigned long) (bus_to_nid[d->bus->number]) << 32);
printk("PCI: Fixing isp1020 in [bus:slot.fn] %s\n", pci_name(d));
/*
* Configure device to allow bus mastering, i/o and memory mapping.
* Older qlogicisp driver expects to have the IO space enable
* bit set. Things stop working if we program the controllers as not
* having PCI_COMMAND_MEMORY, so we have to fudge the mem_flags.
*/
pci_set_master(d);
pci_read_config_word(d, PCI_COMMAND, &command);
command |= PCI_COMMAND_MEMORY;
command |= PCI_COMMAND_IO;
pci_write_config_word(d, PCI_COMMAND, command);
d->resource[1].flags |= 1;
pci_enable_swapping(d);
}
static void __init pci_fixup_isp2x00(struct pci_dev *d)
{
unsigned int bus_id = (unsigned) d->bus->number;
bridge_t *bridge = (bridge_t *) NODE_SWIN_BASE(bus_to_nid[bus_id],
bus_to_wid[bus_id]);
bridgereg_t devreg;
int i;
int slot = PCI_SLOT(d->devfn);
unsigned int start;
unsigned short command;
printk("PCI: Fixing isp2x00 in [bus:slot.fn] %s\n", pci_name(d));
/* set the resource struct for this device */
start = (u32) (u64) bridge; /* yes, we want to lose the upper 32 bits here */
start |= BRIDGE_DEVIO(slot);
d->resource[0].start = start;
d->resource[0].end = d->resource[0].start + 0xff;
d->resource[0].flags = IORESOURCE_IO;
d->resource[1].start = start;
d->resource[1].end = d->resource[0].start + 0xfff;
d->resource[1].flags = IORESOURCE_MEM;
/*
* set the bridge device(x) reg for this device
*/
devreg = bridge->b_device[slot].reg;
/* point device(x) to it appropriate small window */
devreg &= ~BRIDGE_DEV_OFF_MASK;
devreg |= (start >> 20) & BRIDGE_DEV_OFF_MASK;
bridge->b_device[slot].reg = devreg;
pci_enable_swapping(d);
/* set card's base addr reg */
//pci_write_config_dword(d, PCI_BASE_ADDRESS_0, 0x500001);
//pci_write_config_dword(d, PCI_BASE_ADDRESS_1, 0x8b00000);
//pci_write_config_dword(d, PCI_ROM_ADDRESS, 0x8b20000);
/* I got these from booting irix on system... */
pci_write_config_dword(d, PCI_BASE_ADDRESS_0, 0x200001);
//pci_write_config_dword(d, PCI_BASE_ADDRESS_1, 0xf800000);
pci_write_config_dword(d, PCI_ROM_ADDRESS, 0x10200000);
pci_write_config_dword(d, PCI_BASE_ADDRESS_1, start);
//pci_write_config_dword(d, PCI_ROM_ADDRESS, (start | 0x20000));
/* set cache line size */
pci_write_config_dword(d, PCI_CACHE_LINE_SIZE, 0xf080);
/* set pci bus timeout */
bridge->b_bus_timeout |= BRIDGE_BUS_PCI_RETRY_HLD(0x3);
bridge->b_wid_tflush;
printk("PCI: bridge bus timeout= 0x%x \n", bridge->b_bus_timeout);
/* set host error field */
bridge->b_int_host_err = 0x44;
bridge->b_wid_tflush;
bridge->b_wid_tflush; /* wait until Bridge PIO complete */
for (i = 0; i < 8; i++)
printk("PCI: device(%d)= 0x%x\n", i,
bridge->b_device[i].reg);
/* configure device to allow bus mastering, i/o and memory mapping */
pci_set_master(d);
pci_read_config_word(d, PCI_COMMAND, &command);
command |= PCI_COMMAND_MEMORY;
command |= PCI_COMMAND_IO;
pci_write_config_word(d, PCI_COMMAND, command);
/*d->resource[1].flags |= 1; */
}
struct pci_fixup pcibios_fixups[] = {
{PCI_FIXUP_HEADER, PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,
pci_fixup_ioc3},
{PCI_FIXUP_HEADER, PCI_VENDOR_ID_QLOGIC,
PCI_DEVICE_ID_QLOGIC_ISP1020,
pci_fixup_isp1020},
{PCI_FIXUP_HEADER, PCI_VENDOR_ID_QLOGIC,
PCI_DEVICE_ID_QLOGIC_ISP2100,
pci_fixup_isp2x00},
{PCI_FIXUP_HEADER, PCI_VENDOR_ID_QLOGIC,
PCI_DEVICE_ID_QLOGIC_ISP2200,
pci_fixup_isp2x00},
{0}
};
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