/* $Id: pci.c,v 1.6 2000/01/29 00:12:05 grundler Exp $
*
* 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 Ralf Baechle
* Copyright (C) 1999 SuSE GmbH
* Copyright (C) 1999-2001 Hewlett-Packard Company
* Copyright (C) 1999-2001 Grant Grundler
*/
#include <linux/eisa.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/cache.h> /* for L1_CACHE_BYTES */
#include <asm/superio.h>
#define DEBUG_RESOURCES 0
#define DEBUG_CONFIG 0
#if DEBUG_CONFIG
# define DBGC(x...) printk(KERN_DEBUG x)
#else
# define DBGC(x...)
#endif
#if DEBUG_RESOURCES
#define DBG_RES(x...) printk(KERN_DEBUG x)
#else
#define DBG_RES(x...)
#endif
/* To be used as: mdelay(pci_post_reset_delay);
*
* post_reset is the time the kernel should stall to prevent anyone from
* accessing the PCI bus once #RESET is de-asserted.
* PCI spec somewhere says 1 second but with multi-PCI bus systems,
* this makes the boot time much longer than necessary.
* 20ms seems to work for all the HP PCI implementations to date.
*
* #define pci_post_reset_delay 50
*/
struct pci_port_ops *pci_port __read_mostly;
struct pci_bios_ops *pci_bios __read_mostly;
static int pci_hba_count __read_mostly;
/* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data. */
#define PCI_HBA_MAX 32
static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __read_mostly;
/********************************************************************
**
** I/O port space support
**
*********************************************************************/
/* EISA port numbers and PCI port numbers share the same interface. Some
* machines have both EISA and PCI adapters installed. Rather than turn
* pci_port into an array, we reserve bus 0 for EISA and call the EISA
* routines if the access is to a port on bus 0. We don't want to fix
* EISA and ISA drivers which assume port space is <= 0xffff.
*/
#ifdef CONFIG_EISA
#define EISA_IN(size) if (EISA_bus && (b == 0)) return eisa_in##size(addr)
#define EISA_OUT(size) if (EISA_bus && (b == 0)) return eisa_out##size(d, addr)
#else
#define EISA_IN(size)
#define EISA_OUT(size)
#endif
#define PCI_PORT_IN(type, size) \
u##size in##type (int addr) \
{ \
int b = PCI_PORT_HBA(addr); \
EISA_IN(size); \
if (!parisc_pci_hba[b]) return (u##size) -1; \
return pci_port->in##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr)); \
} \
EXPORT_SYMBOL(in##type);
PCI_PORT_IN(b, 8)
PCI_PORT_IN(w, 16)
PCI_PORT_IN(l, 32)
#define PCI_PORT_OUT(type, size) \
void out##type (u##size d, int addr) \
{ \
int b = PCI_PORT_HBA(addr); \
EISA_OUT(size); \
if (!parisc_pci_hba[b]) return; \
pci_port->out##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr), d); \
} \
EXPORT_SYMBOL(out##type);
PCI_PORT_OUT(b, 8)
PCI_PORT_OUT(w, 16)
PCI_PORT_OUT(l, 32)
/*
* BIOS32 replacement.
*/
static int __init pcibios_init(void)
{
if (!pci_bios)
return -1;
if (pci_bios->init) {
pci_bios->init();
} else {
printk(KERN_WARNING "pci_bios != NULL but init() is!\n");
}
return 0;
}
/* Called from pci_do_scan_bus() *after* walking a bus but before walking PPBs. */
void pcibios_fixup_bus(struct pci_bus *bus)
{
if (pci_bios->fixup_bus) {
pci_bios->fixup_bus(bus);
} else {
printk(KERN_WARNING "pci_bios != NULL but fixup_bus() is!\n");
}
}
char *pcibios_setup(char *str)
{
return str;
}
/*
* Called by pci_set_master() - a driver interface.
*
* Legacy PDC guarantees to set:
* Map Memory BAR's into PA IO space.
* Map Expansion ROM BAR into one common PA IO space per bus.
* Map IO BAR's into PCI IO space.
* Command (see below)
* Cache Line Size
* Latency Timer
* Interrupt Line
* PPB: secondary latency timer, io/mmio base/limit,
* bus numbers, bridge control
*
*/
void pcibios_set_master(struct pci_dev *dev)
{
u8 lat;
/* If someone already mucked with this, don't touch it. */
pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
if (lat >= 16) return;
/*
** HP generally has fewer devices on the bus than other architectures.
** upper byte is PCI_LATENCY_TIMER.
*/
pci_write_config_word(dev, PCI_CACHE_LINE_SIZE,
(0x80 << 8) | (L1_CACHE_BYTES / sizeof(u32)));
}
void __init pcibios_init_bus(struct pci_bus *bus)
{
struct pci_dev *dev = bus->self;
unsigned short bridge_ctl;
/* We deal only with pci controllers and pci-pci bridges. */
if (!dev || (dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
return;
/* PCI-PCI bridge - set the cache line and default latency
(32) for primary and secondary buses. */
pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 32);
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bridge_ctl);
bridge_ctl |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bridge_ctl);
}
/* KLUGE: Link the child and parent resources - generic PCI didn't */
static void
pcibios_link_hba_resources( struct resource *hba_res, struct resource *r)
{
if (!r->parent) {
printk(KERN_EMERG "PCI: resource not parented! [%lx-%lx]\n",
r->start, r->end);
r->parent = hba_res;
/* reverse link is harder *sigh* */
if (r->parent->child) {
if (r->parent->sibling) {
struct resource *next = r->parent->sibling;
while (next->sibling)
next = next->sibling;
next->sibling = r;
} else {
r->parent->sibling = r;
}
} else
r->parent->child = r;
}
}
/* called by drivers/pci/setup-bus.c:pci_setup_bridge(). */
void __devinit pcibios_resource_to_bus(struct pci_dev *dev,
struct pci_bus_region *region, struct resource *res)
{
struct pci_bus *bus = dev->bus;
struct pci_hba_data *hba = HBA_DATA(bus->bridge->platform_data);
if (res->flags & IORESOURCE_IO) {
/*
** I/O space may see busnumbers here. Something
** in the form of 0xbbxxxx where bb is the bus num
** and xxxx is the I/O port space address.
** Remaining address translation are done in the
** PCI Host adapter specific code - ie dino_out8.
*/
region->start = PCI_PORT_ADDR(res->start);
region->end = PCI_PORT_ADDR(res->end);
} else if (res->flags & IORESOURCE_MEM) {
/* Convert MMIO addr to PCI addr (undo global virtualization) */
region->start = PCI_BUS_ADDR(hba, res->start);
region->end = PCI_BUS_ADDR(hba, res->end);
}
DBG_RES("pcibios_resource_to_bus(%02x %s [%lx,%lx])\n",
bus->number, res->flags & IORESOURCE_IO ? "IO" : "MEM",
region->start, region->end);
/* KLUGE ALERT
** if this resource isn't linked to a "parent", then it seems
** to be a child of the HBA - lets link it in.
*/
pcibios_link_hba_resources(&hba->io_space, bus->resource[0]);
pcibios_link_hba_resources(&hba->lmmio_space, bus->resource[1]);
}
void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
struct pci_bus_region *region)
{
#ifdef CONFIG_64BIT
struct pci_bus *bus = dev->bus;
struct pci_hba_data *hba = HBA_DATA(bus->bridge->platform_data);
#endif
if (res->flags & IORESOURCE_MEM) {
res->start = PCI_HOST_ADDR(hba, region->start);
res->end = PCI_HOST_ADDR(hba, region->end);
}
if (res->flags & IORESOURCE_IO) {
res->start = region->start;
res->end = region->end;
}
}
#ifdef CONFIG_HOTPLUG
EXPORT_SYMBOL(pcibios_resource_to_bus);
EXPORT_SYMBOL(pcibios_bus_to_resource);
#endif
/*
* pcibios align resources() is called every time generic PCI code
* wants to generate a new address. The process of looking for
* an available address, each candidate is first "aligned" and
* then checked if the resource is available until a match is found.
*
* Since we are just checking candidates, don't use any fields other
* than res->start.
*/
void pcibios_align_resource(void *data, struct resource *res,
resource_size_t size, resource_size_t alignment)
{
resource_size_t mask, align;
DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
pci_name(((struct pci_dev *) data)),
res->parent, res->start, res->end,
(int) res->flags, size, alignment);
/* If it's not IO, then it's gotta be MEM */
align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
/* Align to largest of MIN or input size */
mask = max(alignment, align) - 1;
res->start += mask;
res->start &= ~mask;
/* The caller updates the end field, we don't. */
}
/*
* A driver is enabling the device. We make sure that all the appropriate
* bits are set to allow the device to operate as the driver is expecting.
* We enable the port IO and memory IO bits if the device has any BARs of
* that type, and we enable the PERR and SERR bits unconditionally.
* Drivers that do not need parity (eg graphics and possibly networking)
* can clear these bits if they want.
*/
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
u16 cmd;
int idx;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
for (idx = 0; idx < DEVICE_COUNT_RESOURCE; idx++) {
struct resource *r = &dev->resource[idx];
/* only setup requested resources */
if (!(mask & (1<<idx)))
continue;
if (r->flags & IORESOURCE_IO)
cmd |= PCI_COMMAND_IO;
if (r->flags & IORESOURCE_MEM)
cmd |= PCI_COMMAND_MEMORY;
}
cmd |= (PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
#if 0
/* If bridge/bus controller has FBB enabled, child must too. */
if (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_FAST_BACK)
cmd |= PCI_COMMAND_FAST_BACK;
#endif
DBGC("PCIBIOS: Enabling device %s cmd 0x%04x\n", pci_name(dev), cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
return 0;
}
/* PA-RISC specific */
void pcibios_register_hba(struct pci_hba_data *hba)
{
if (pci_hba_count >= PCI_HBA_MAX) {
printk(KERN_ERR "PCI: Too many Host Bus Adapters\n");
return;
}
parisc_pci_hba[pci_hba_count] = hba;
hba->hba_num = pci_hba_count++;
}
subsys_initcall(pcibios_init);
