/*
* arch/arm/mach-orion/pci.c
*
* PCI and PCIE functions for Marvell Orion System On Chip
*
* Maintainer: Tzachi Perelstein <tzachi@marvell.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/mbus.h>
#include <asm/mach/pci.h>
#include "common.h"
/*****************************************************************************
* Orion has one PCIE controller and one PCI controller.
*
* Note1: The local PCIE bus number is '0'. The local PCI bus number
* follows the scanned PCIE bridged busses, if any.
*
* Note2: It is possible for PCI/PCIE agents to access many subsystem's
* space, by configuring BARs and Address Decode Windows, e.g. flashes on
* device bus, Orion registers, etc. However this code only enable the
* access to DDR banks.
****************************************************************************/
/*****************************************************************************
* PCIE controller
****************************************************************************/
#define PCIE_CTRL ORION_PCIE_REG(0x1a00)
#define PCIE_STAT ORION_PCIE_REG(0x1a04)
#define PCIE_DEV_ID ORION_PCIE_REG(0x0000)
#define PCIE_CMD_STAT ORION_PCIE_REG(0x0004)
#define PCIE_DEV_REV ORION_PCIE_REG(0x0008)
#define PCIE_MASK ORION_PCIE_REG(0x1910)
#define PCIE_CONF_ADDR ORION_PCIE_REG(0x18f8)
#define PCIE_CONF_DATA ORION_PCIE_REG(0x18fc)
/*
* PCIE_STAT bits
*/
#define PCIE_STAT_LINK_DOWN 1
#define PCIE_STAT_BUS_OFFS 8
#define PCIE_STAT_BUS_MASK (0xff << PCIE_STAT_BUS_OFFS)
#define PCIE_STAT_DEV_OFFS 20
#define PCIE_STAT_DEV_MASK (0x1f << PCIE_STAT_DEV_OFFS)
/*
* PCIE_CONF_ADDR bits
*/
#define PCIE_CONF_REG(r) ((((r) & 0xf00) << 24) | ((r) & 0xfc))
#define PCIE_CONF_FUNC(f) (((f) & 0x3) << 8)
#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
#define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
#define PCIE_CONF_ADDR_EN (1 << 31)
/*
* PCIE Address Decode Windows registers
*/
#define PCIE_BAR_CTRL(n) ORION_PCIE_REG(0x1804 + ((n - 1) * 4))
#define PCIE_BAR_LO(n) ORION_PCIE_REG(0x0010 + ((n) * 8))
#define PCIE_BAR_HI(n) ORION_PCIE_REG(0x0014 + ((n) * 8))
#define PCIE_WIN_CTRL(n) (((n) < 5) ? \
ORION_PCIE_REG(0x1820 + ((n) << 4)) : \
ORION_PCIE_REG(0x1880))
#define PCIE_WIN_BASE(n) (((n) < 5) ? \
ORION_PCIE_REG(0x1824 + ((n) << 4)) : \
ORION_PCIE_REG(0x1884))
#define PCIE_WIN_REMAP(n) (((n) < 5) ? \
ORION_PCIE_REG(0x182c + ((n) << 4)) : \
ORION_PCIE_REG(0x188c))
#define PCIE_MAX_BARS 3
#define PCIE_MAX_WINS 6
/*
* Use PCIE BAR '1' for all DDR banks
*/
#define PCIE_DRAM_BAR 1
/*
* PCIE config cycles are done by programming the PCIE_CONF_ADDR register
* and then reading the PCIE_CONF_DATA register. Need to make sure these
* transactions are atomic.
*/
static DEFINE_SPINLOCK(orion_pcie_lock);
void orion_pcie_id(u32 *dev, u32 *rev)
{
*dev = orion_read(PCIE_DEV_ID) >> 16;
*rev = orion_read(PCIE_DEV_REV) & 0xff;
}
u32 orion_pcie_local_bus_nr(void)
{
u32 stat = orion_read(PCIE_STAT);
return((stat & PCIE_STAT_BUS_MASK) >> PCIE_STAT_BUS_OFFS);
}
static u32 orion_pcie_local_dev_nr(void)
{
u32 stat = orion_read(PCIE_STAT);
return((stat & PCIE_STAT_DEV_MASK) >> PCIE_STAT_DEV_OFFS);
}
static u32 orion_pcie_no_link(void)
{
u32 stat = orion_read(PCIE_STAT);
return(stat & PCIE_STAT_LINK_DOWN);
}
static void orion_pcie_set_bus_nr(int nr)
{
orion_clrbits(PCIE_STAT, PCIE_STAT_BUS_MASK);
orion_setbits(PCIE_STAT, nr << PCIE_STAT_BUS_OFFS);
}
/*
* Setup PCIE BARs and Address Decode Wins:
* BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
* WIN[0-3] -> DRAM bank[0-3]
*/
static void orion_setup_pcie_wins(struct mbus_dram_target_info *dram)
{
u32 size;
int i;
/*
* First, disable and clear BARs and windows
*/
for (i = 1; i < PCIE_MAX_BARS; i++) {
writel(0, PCIE_BAR_CTRL(i));
writel(0, PCIE_BAR_LO(i));
writel(0, PCIE_BAR_HI(i));
}
for (i = 0; i < PCIE_MAX_WINS; i++) {
writel(0, PCIE_WIN_CTRL(i));
writel(0, PCIE_WIN_BASE(i));
writel(0, PCIE_WIN_REMAP(i));
}
/*
* Setup windows for DDR banks. Count total DDR size on the fly.
*/
size = 0;
for (i = 0; i < dram->num_cs; i++) {
struct mbus_dram_window *cs = dram->cs + i;
writel(cs->base & 0xffff0000, PCIE_WIN_BASE(i));
writel(0, PCIE_WIN_REMAP(i));
writel(((cs->size - 1) & 0xffff0000) |
(cs->mbus_attr << 8) |
(dram->mbus_dram_target_id << 4) |
(PCIE_DRAM_BAR << 1) | 1, PCIE_WIN_CTRL(i));
size += cs->size;
}
/*
* Setup BAR[1] to all DRAM banks
*/
writel(dram->cs[0].base, PCIE_BAR_LO(PCIE_DRAM_BAR));
writel(0, PCIE_BAR_HI(PCIE_DRAM_BAR));
writel(((size - 1) & 0xffff0000) | 1, PCIE_BAR_CTRL(PCIE_DRAM_BAR));
}
static void orion_pcie_master_slave_enable(void)
{
orion_setbits(PCIE_CMD_STAT, PCI_COMMAND_MASTER |
PCI_COMMAND_IO |
PCI_COMMAND_MEMORY);
}
static void orion_pcie_enable_interrupts(void)
{
/*
* Enable interrupts lines
* INTA[24] INTB[25] INTC[26] INTD[27]
*/
orion_setbits(PCIE_MASK, 0xf<<24);
}
static int orion_pcie_valid_config(u32 bus, u32 dev)
{
/*
* Don't go out when trying to access --
* 1. our own device
* 2. where there's no device connected (no link)
* 3. nonexisting devices on local bus
*/
if ((orion_pcie_local_bus_nr() == bus) &&
(orion_pcie_local_dev_nr() == dev))
return 0;
if (orion_pcie_no_link())
return 0;
if (bus == orion_pcie_local_bus_nr())
if (((orion_pcie_local_dev_nr() == 0) && (dev != 1)) ||
((orion_pcie_local_dev_nr() != 0) && (dev != 0)))
return 0;
return 1;
}
static int orion_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
int size, u32 *val)
{
unsigned long flags;
unsigned int dev, rev, pcie_addr;
if (orion_pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
spin_lock_irqsave(&orion_pcie_lock, flags);
orion_write(PCIE_CONF_ADDR, PCIE_CONF_BUS(bus->number) |
PCIE_CONF_DEV(PCI_SLOT(devfn)) |
PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN);
orion_pcie_id(&dev, &rev);
if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) {
/* extended register space */
pcie_addr = ORION_PCIE_WA_VIRT_BASE;
pcie_addr |= PCIE_CONF_BUS(bus->number) |
PCIE_CONF_DEV(PCI_SLOT(devfn)) |
PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
PCIE_CONF_REG(where);
*val = orion_read(pcie_addr);
} else
*val = orion_read(PCIE_CONF_DATA);
if (size == 1)
*val = (*val >> (8*(where & 0x3))) & 0xff;
else if (size == 2)
*val = (*val >> (8*(where & 0x3))) & 0xffff;
spin_unlock_irqrestore(&orion_pcie_lock, flags);
return PCIBIOS_SUCCESSFUL;
}
static int orion_pcie_wr_conf(struct pci_bus *bus, u32 devfn, int where,
int size, u32 val)
{
unsigned long flags;
int ret;
if (orion_pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
return PCIBIOS_DEVICE_NOT_FOUND;
spin_lock_irqsave(&orion_pcie_lock, flags);
ret = PCIBIOS_SUCCESSFUL;
orion_write(PCIE_CONF_ADDR, PCIE_CONF_BUS(bus->number) |
PCIE_CONF_DEV(PCI_SLOT(devfn)) |
PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN);
if (size == 4) {
__raw_writel(val, PCIE_CONF_DATA);
} else if (size == 2) {
__raw_writew(val, PCIE_CONF_DATA + (where & 0x3));
} else if (size == 1) {
__raw_writeb(val, PCIE_CONF_DATA + (where & 0x3));
} else {
ret = PCIBIOS_BAD_REGISTER_NUMBER;
}
spin_unlock_irqrestore(&orion_pcie_lock, flags);
return ret;
}
struct pci_ops orion_pcie_ops = {
.read = orion_pcie_rd_conf,
.write = orion_pcie_wr_conf,
};
static int orion_pcie_setup(struct pci_sys_data *sys)
{
struct resource *res;
/*
* Point PCIe unit MBUS decode windows to DRAM space.
*/
orion_setup_pcie_wins(&orion_mbus_dram_info);
/*
* Master + Slave enable
*/
orion_pcie_master_slave_enable();
/*
* Enable interrupts lines A-D
*/
orion_pcie_enable_interrupts();
/*
* Request resource
*/
res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
if (!res)
panic("orion_pci_setup unable to alloc resources");
/*
* IORESOURCE_IO
*/
res[0].name = "PCI-EX I/O Space";
res[0].flags = IORESOURCE_IO;
res[0].start = ORION_PCIE_IO_BUS_BASE;
res[0].end = res[0].start + ORION_PCIE_IO_SIZE - 1;
if (request_resource(&ioport_resource, &res[0]))
panic("Request PCIE IO resource failed\n");
sys->resource[0] = &res[0];
/*
* IORESOURCE_MEM
*/
res[1].name = "PCI-EX Memory Space";
res[1].flags = IORESOURCE_MEM;
res[1].start = ORION_PCIE_MEM_PHYS_BASE;
res[1].end = res[1].start + ORION_PCIE_MEM_SIZE - 1;
if (request_resource(&iomem_resource, &res[1]))
panic("Request PCIE Memory resource failed\n");
sys->resource[1] = &res[1];
sys->resource[2] = NULL;
sys->io_offset = 0;
return 1;
}
/*****************************************************************************
* PCI controller
****************************************************************************/
#define PCI_MODE ORION_PCI_REG(0xd00)
#define PCI_CMD ORION_PCI_REG(0xc00)
#define PCI_P2P_CONF ORION_PCI_REG(0x1d14)
#define PCI_CONF_ADDR ORION_PCI_REG(0xc78)
#define PCI_CONF_DATA ORION_PCI_REG(0xc7c)
/*
* PCI_MODE bits
*/
#define PCI_MODE_64BIT (1 << 2)
#define PCI_MODE_PCIX ((1 << 4) | (1 << 5))
/*
* PCI_CMD bits
*/
#define PCI_CMD_HOST_REORDER (1 << 29)
/*
* PCI_P2P_CONF bits
*/
#define PCI_P2P_BUS_OFFS 16
#define PCI_P2P_BUS_MASK (0xff << PCI_P2P_BUS_OFFS)
#define PCI_P2P_DEV_OFFS 24
#define PCI_P2P_DEV_MASK (0x1f << PCI_P2P_DEV_OFFS)
/*
* PCI_CONF_ADDR bits
*/
#define PCI_CONF_REG(reg) ((reg) & 0xfc)
#define PCI_CONF_FUNC(func) (((func) & 0x3) << 8)
#define PCI_CONF_DEV(dev) (((dev) & 0x1f) << 11)
#define PCI_CONF_BUS(bus) (((bus) & 0xff) << 16)
#define PCI_CONF_ADDR_EN (1 << 31)
/*
* Internal configuration space
*/
#define PCI_CONF_FUNC_STAT_CMD 0
#define PCI_CONF_REG_STAT_CMD 4
#define PCIX_STAT 0x64
#define PCIX_STAT_BUS_OFFS 8
#define PCIX_STAT_BUS_MASK (0xff << PCIX_STAT_BUS_OFFS)
/*
* PCI Address Decode Windows registers
*/
#define PCI_BAR_SIZE_DDR_CS(n) (((n) == 0) ? ORION_PCI_REG(0xc08) : \
((n) == 1) ? ORION_PCI_REG(0xd08) : \
((n) == 2) ? ORION_PCI_REG(0xc0c) : \
((n) == 3) ? ORION_PCI_REG(0xd0c) : 0)
#define PCI_BAR_REMAP_DDR_CS(n) (((n) ==0) ? ORION_PCI_REG(0xc48) : \
((n) == 1) ? ORION_PCI_REG(0xd48) : \
((n) == 2) ? ORION_PCI_REG(0xc4c) : \
((n) == 3) ? ORION_PCI_REG(0xd4c) : 0)
#define PCI_BAR_ENABLE ORION_PCI_REG(0xc3c)
#define PCI_ADDR_DECODE_CTRL ORION_PCI_REG(0xd3c)
/*
* PCI configuration helpers for BAR settings
*/
#define PCI_CONF_FUNC_BAR_CS(n) ((n) >> 1)
#define PCI_CONF_REG_BAR_LO_CS(n) (((n) & 1) ? 0x18 : 0x10)
#define PCI_CONF_REG_BAR_HI_CS(n) (((n) & 1) ? 0x1c : 0x14)
/*
* PCI config cycles are done by programming the PCI_CONF_ADDR register
* and then reading the PCI_CONF_DATA register. Need to make sure these
* transactions are atomic.
*/
static DEFINE_SPINLOCK(orion_pci_lock);
u32 orion_pci_local_bus_nr(void)
{
u32 conf = orion_read(PCI_P2P_CONF);
return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
}
static u32 orion_pci_local_dev_nr(void)
{
u32 conf = orion_read(PCI_P2P_CONF);
return((conf & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS);
}
static int orion_pci_hw_rd_conf(u32 bus, u32 dev, u32 func,
u32 where, u32 size, u32 *val)
{
unsigned long flags;
spin_lock_irqsave(&orion_pci_lock, flags);
orion_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) |
PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN);
*val = orion_read(PCI_CONF_DATA);
if (size == 1)
*val = (*val >> (8*(where & 0x3))) & 0xff;
else if (size == 2)
*val = (*val >> (8*(where & 0x3))) & 0xffff;
spin_unlock_irqrestore(&orion_pci_lock, flags);
return PCIBIOS_SUCCESSFUL;
}
static int orion_pci_hw_wr_conf(u32 bus, u32 dev, u32 func,
u32 where, u32 size, u32 val)
{
unsigned long flags;
int ret = PCIBIOS_SUCCESSFUL;
spin_lock_irqsave(&orion_pci_lock, flags);
orion_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) |
PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN);
if (size == 4) {
__raw_writel(val, PCI_CONF_DATA);
} else if (size == 2) {
__raw_writew(val, PCI_CONF_DATA + (where & 0x3));
} else if (size == 1) {
__raw_writeb(val, PCI_CONF_DATA + (where & 0x3));
} else {
ret = PCIBIOS_BAD_REGISTER_NUMBER;
}
spin_unlock_irqrestore(&orion_pci_lock, flags);
return ret;
}
static int orion_pci_rd_conf(struct pci_bus *bus, u32 devfn,
int where, int size, u32 *val)
{
/*
* Don't go out for local device
*/
if ((orion_pci_local_bus_nr() == bus->number) &&
(orion_pci_local_dev_nr() == PCI_SLOT(devfn))) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
return orion_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
PCI_FUNC(devfn), where, size, val);
}
static int orion_pci_wr_conf(struct pci_bus *bus, u32 devfn,
int where, int size, u32 val)
{
/*
* Don't go out for local device
*/
if ((orion_pci_local_bus_nr() == bus->number) &&
(orion_pci_local_dev_nr() == PCI_SLOT(devfn)))
return PCIBIOS_DEVICE_NOT_FOUND;
return orion_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
PCI_FUNC(devfn), where, size, val);
}
struct pci_ops orion_pci_ops = {
.read = orion_pci_rd_conf,
.write = orion_pci_wr_conf,
};
static void orion_pci_set_bus_nr(int nr)
{
u32 p2p = orion_read(PCI_P2P_CONF);
if (orion_read(PCI_MODE) & PCI_MODE_PCIX) {
/*
* PCI-X mode
*/
u32 pcix_status, bus, dev;
bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS;
dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS;
orion_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status);
pcix_status &= ~PCIX_STAT_BUS_MASK;
pcix_status |= (nr << PCIX_STAT_BUS_OFFS);
orion_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status);
} else {
/*
* PCI Conventional mode
*/
p2p &= ~PCI_P2P_BUS_MASK;
p2p |= (nr << PCI_P2P_BUS_OFFS);
orion_write(PCI_P2P_CONF, p2p);
}
}
static void orion_pci_master_slave_enable(void)
{
u32 bus_nr, dev_nr, func, reg, val;
bus_nr = orion_pci_local_bus_nr();
dev_nr = orion_pci_local_dev_nr();
func = PCI_CONF_FUNC_STAT_CMD;
reg = PCI_CONF_REG_STAT_CMD;
orion_pci_hw_rd_conf(bus_nr, dev_nr, func, reg, 4, &val);
val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
orion_pci_hw_wr_conf(bus_nr, dev_nr, func, reg, 4, val | 0x7);
}
static void orion_setup_pci_wins(struct mbus_dram_target_info *dram)
{
u32 win_enable;
u32 bus;
u32 dev;
int i;
/*
* First, disable windows.
*/
win_enable = 0xffffffff;
orion_write(PCI_BAR_ENABLE, win_enable);
/*
* Setup windows for DDR banks.
*/
bus = orion_pci_local_bus_nr();
dev = orion_pci_local_dev_nr();
for (i = 0; i < dram->num_cs; i++) {
struct mbus_dram_window *cs = dram->cs + i;
u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index);
u32 reg;
u32 val;
/*
* Write DRAM bank base address register.
*/
reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index);
orion_pci_hw_rd_conf(bus, dev, func, reg, 4, &val);
val = (cs->base & 0xfffff000) | (val & 0xfff);
orion_pci_hw_wr_conf(bus, dev, func, reg, 4, val);
/*
* Write DRAM bank size register.
*/
reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index);
orion_pci_hw_wr_conf(bus, dev, func, reg, 4, 0);
orion_write(PCI_BAR_SIZE_DDR_CS(cs->cs_index),
(cs->size - 1) & 0xfffff000);
orion_write(PCI_BAR_REMAP_DDR_CS(cs->cs_index),
cs->base & 0xfffff000);
/*
* Enable decode window for this chip select.
*/
win_enable &= ~(1 << cs->cs_index);
}
/*
* Re-enable decode windows.
*/
orion_write(PCI_BAR_ENABLE, win_enable);
/*
* Disable automatic update of address remaping when writing to BARs.
*/
orion_setbits(PCI_ADDR_DECODE_CTRL, 1);
}
static int orion_pci_setup(struct pci_sys_data *sys)
{
struct resource *res;
/*
* Point PCI unit MBUS decode windows to DRAM space.
*/
orion_setup_pci_wins(&orion_mbus_dram_info);
/*
* Master + Slave enable
*/
orion_pci_master_slave_enable();
/*
* Force ordering
*/
orion_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
/*
* Request resources
*/
res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
if (!res)
panic("orion_pci_setup unable to alloc resources");
/*
* IORESOURCE_IO
*/
res[0].name = "PCI I/O Space";
res[0].flags = IORESOURCE_IO;
res[0].start = ORION_PCI_IO_BUS_BASE;
res[0].end = res[0].start + ORION_PCI_IO_SIZE - 1;
if (request_resource(&ioport_resource, &res[0]))
panic("Request PCI IO resource failed\n");
sys->resource[0] = &res[0];
/*
* IORESOURCE_MEM
*/
res[1].name = "PCI Memory Space";
res[1].flags = IORESOURCE_MEM;
res[1].start = ORION_PCI_MEM_PHYS_BASE;
res[1].end = res[1].start + ORION_PCI_MEM_SIZE - 1;
if (request_resource(&iomem_resource, &res[1]))
panic("Request PCI Memory resource failed\n");
sys->resource[1] = &res[1];
sys->resource[2] = NULL;
sys->io_offset = 0;
return 1;
}
/*****************************************************************************
* General PCIE + PCI
****************************************************************************/
int orion_pci_sys_setup(int nr, struct pci_sys_data *sys)
{
int ret = 0;
if (nr == 0) {
/*
* PCIE setup
*/
orion_pcie_set_bus_nr(0);
ret = orion_pcie_setup(sys);
} else if (nr == 1) {
/*
* PCI setup
*/
ret = orion_pci_setup(sys);
}
return ret;
}
struct pci_bus *orion_pci_sys_scan_bus(int nr, struct pci_sys_data *sys)
{
struct pci_ops *ops;
struct pci_bus *bus;
if (nr == 0) {
u32 pci_bus;
/*
* PCIE scan
*/
ops = &orion_pcie_ops;
bus = pci_scan_bus(sys->busnr, ops, sys);
/*
* Set local PCI bus number to follow PCIE bridges (if any)
*/
pci_bus = bus->number + bus->subordinate - bus->secondary + 1;
orion_pci_set_bus_nr(pci_bus);
} else if (nr == 1) {
/*
* PCI scan
*/
ops = &orion_pci_ops;
bus = pci_scan_bus(sys->busnr, ops, sys);
} else {
BUG();
bus = NULL;
}
return bus;
}
