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linux/arch/sh/drivers/pci/pci-auto.c
Hideo Saito bb68660943 sh: Fix PCI BAR address-space wraparound. 
When a SH7751R system includes a card that has wide range space
like a graphics card, the pci-pci bridge controller can't set the
correct address range.

For example, when *lower_limit is 0xfd000000 and bar_size is
0x4000000, in the following code at arch/sh/drivers/pci/pci-auto.c,
0x0 is set in bar_value.

pciauto_setup_bars()
{
...
                bar_value = ((*lower_limit - 1) & ~(bar_size - 1)) + bar_size;
...
                *lower_limit = bar_value + bar_size;
}

As a result, 0x4000000 is set in *lower_limit, but this value is wrong.

The following patch avoids this problem by checking the range of the
value and refusing to update the BAR if the calculated value ends up
being bogus.

Signed-off-by: Hideo Saito <saito@densan.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-03-12 14:50:49 +09:00

548 lines
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/*
* PCI autoconfiguration library
*
* Author: Matt Porter <mporter@mvista.com>
*
* Copyright 2000, 2001 MontaVista Software Inc.
* Copyright 2001 Bradley D. LaRonde <brad@ltc.com>
* Copyright 2003 Paul Mundt <lethal@linux-sh.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
/*
* Modified for MIPS by Jun Sun, jsun@mvista.com
*
* . Simplify the interface between pci_auto and the rest: a single function.
* . Assign resources from low address to upper address.
* . change most int to u32.
*
* Further modified to include it as mips generic code, ppopov@mvista.com.
*
* 2001-10-26 Bradley D. LaRonde <brad@ltc.com>
* - Add a top_bus argument to the "early config" functions so that
* they can set a fake parent bus pointer to convince the underlying
* pci ops to use type 1 configuration for sub busses.
* - Set bridge base and limit registers correctly.
* - Align io and memory base properly before and after bridge setup.
* - Don't fall through to pci_setup_bars for bridge.
* - Reformat the debug output to look more like lspci's output.
*
* Cloned for SuperH by M. R. Brown, mrbrown@0xd6.org
*
* 2003-08-05 Paul Mundt <lethal@linux-sh.org>
* - Don't update the BAR values on systems that already have valid addresses
* and don't want these updated for whatever reason, by way of a new config
* option check. However, we still read in the old BAR values so that they
* can still be reported through the debug output.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#define DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif
/*
* These functions are used early on before PCI scanning is done
* and all of the pci_dev and pci_bus structures have been created.
*/
static struct pci_dev *fake_pci_dev(struct pci_channel *hose,
int top_bus, int busnr, int devfn)
{
static struct pci_dev dev;
static struct pci_bus bus;
dev.bus = &bus;
dev.sysdata = hose;
dev.devfn = devfn;
bus.number = busnr;
bus.ops = hose->pci_ops;
if(busnr != top_bus)
/* Fake a parent bus structure. */
bus.parent = &bus;
else
bus.parent = NULL;
return &dev;
}
#define EARLY_PCI_OP(rw, size, type) \
int early_##rw##_config_##size(struct pci_channel *hose, \
int top_bus, int bus, int devfn, int offset, type value) \
{ \
return pci_##rw##_config_##size( \
fake_pci_dev(hose, top_bus, bus, devfn), \
offset, value); \
}
EARLY_PCI_OP(read, byte, u8 *)
EARLY_PCI_OP(read, word, u16 *)
EARLY_PCI_OP(read, dword, u32 *)
EARLY_PCI_OP(write, byte, u8)
EARLY_PCI_OP(write, word, u16)
EARLY_PCI_OP(write, dword, u32)
static struct resource *io_resource_inuse;
static struct resource *mem_resource_inuse;
static u32 pciauto_lower_iospc;
static u32 pciauto_upper_iospc;
static u32 pciauto_lower_memspc;
static u32 pciauto_upper_memspc;
static void __init
pciauto_setup_bars(struct pci_channel *hose,
int top_bus,
int current_bus,
int pci_devfn,
int bar_limit)
{
u32 bar_response, bar_size, bar_value;
u32 bar, addr_mask, bar_nr = 0;
u32 * upper_limit;
u32 * lower_limit;
int found_mem64 = 0;
for (bar = PCI_BASE_ADDRESS_0; bar <= bar_limit; bar+=4) {
u32 bar_addr;
/* Read the old BAR value */
early_read_config_dword(hose, top_bus,
current_bus,
pci_devfn,
bar,
&bar_addr);
/* Tickle the BAR and get the response */
early_write_config_dword(hose, top_bus,
current_bus,
pci_devfn,
bar,
0xffffffff);
early_read_config_dword(hose, top_bus,
current_bus,
pci_devfn,
bar,
&bar_response);
/*
* Write the old BAR value back out, only update the BAR
* if we implicitly want resources to be updated, which
* is done by the generic code further down. -- PFM.
*/
early_write_config_dword(hose, top_bus,
current_bus,
pci_devfn,
bar,
bar_addr);
/* If BAR is not implemented go to the next BAR */
if (!bar_response)
continue;
/*
* Workaround for a BAR that doesn't use its upper word,
* like the ALi 1535D+ PCI DC-97 Controller Modem (M5457).
* bdl <brad@ltc.com>
*/
if (!(bar_response & 0xffff0000))
bar_response |= 0xffff0000;
retry:
/* Check the BAR type and set our address mask */
if (bar_response & PCI_BASE_ADDRESS_SPACE) {
addr_mask = PCI_BASE_ADDRESS_IO_MASK;
upper_limit = &pciauto_upper_iospc;
lower_limit = &pciauto_lower_iospc;
DBG(" I/O");
} else {
if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
PCI_BASE_ADDRESS_MEM_TYPE_64)
found_mem64 = 1;
addr_mask = PCI_BASE_ADDRESS_MEM_MASK;
upper_limit = &pciauto_upper_memspc;
lower_limit = &pciauto_lower_memspc;
DBG(" Mem");
}
/* Calculate requested size */
bar_size = ~(bar_response & addr_mask) + 1;
/* Allocate a base address */
bar_value = ((*lower_limit - 1) & ~(bar_size - 1)) + bar_size;
if ((bar_value + bar_size) > *upper_limit) {
if (bar_response & PCI_BASE_ADDRESS_SPACE) {
if (io_resource_inuse->child) {
io_resource_inuse =
io_resource_inuse->child;
pciauto_lower_iospc =
io_resource_inuse->start;
pciauto_upper_iospc =
io_resource_inuse->end + 1;
goto retry;
}
} else {
if (mem_resource_inuse->child) {
mem_resource_inuse =
mem_resource_inuse->child;
pciauto_lower_memspc =
mem_resource_inuse->start;
pciauto_upper_memspc =
mem_resource_inuse->end + 1;
goto retry;
}
}
DBG(" unavailable -- skipping, value %x size %x\n",
bar_value, bar_size);
continue;
}
if (bar_value < *lower_limit || (bar_value + bar_size) >= *upper_limit) {
DBG(" unavailable -- skipping, value %x size %x\n",
bar_value, bar_size);
continue;
}
#ifdef CONFIG_PCI_AUTO_UPDATE_RESOURCES
/* Write it out and update our limit */
early_write_config_dword(hose, top_bus, current_bus, pci_devfn,
bar, bar_value);
#endif
*lower_limit = bar_value + bar_size;
/*
* If we are a 64-bit decoder then increment to the
* upper 32 bits of the bar and force it to locate
* in the lower 4GB of memory.
*/
if (found_mem64) {
bar += 4;
early_write_config_dword(hose, top_bus,
current_bus,
pci_devfn,
bar,
0x00000000);
}
DBG(" at 0x%.8x [size=0x%x]\n", bar_value, bar_size);
bar_nr++;
}
}
static void __init
pciauto_prescan_setup_bridge(struct pci_channel *hose,
int top_bus,
int current_bus,
int pci_devfn,
int sub_bus)
{
/* Configure bus number registers */
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_PRIMARY_BUS, current_bus);
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_SECONDARY_BUS, sub_bus + 1);
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_SUBORDINATE_BUS, 0xff);
/* Align memory and I/O to 1MB and 4KB boundaries. */
pciauto_lower_memspc = (pciauto_lower_memspc + (0x100000 - 1))
& ~(0x100000 - 1);
pciauto_lower_iospc = (pciauto_lower_iospc + (0x1000 - 1))
& ~(0x1000 - 1);
/* Set base (lower limit) of address range behind bridge. */
early_write_config_word(hose, top_bus, current_bus, pci_devfn,
PCI_MEMORY_BASE, pciauto_lower_memspc >> 16);
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_IO_BASE, (pciauto_lower_iospc & 0x0000f000) >> 8);
early_write_config_word(hose, top_bus, current_bus, pci_devfn,
PCI_IO_BASE_UPPER16, pciauto_lower_iospc >> 16);
/* We don't support prefetchable memory for now, so disable */
early_write_config_word(hose, top_bus, current_bus, pci_devfn,
PCI_PREF_MEMORY_BASE, 0);
early_write_config_word(hose, top_bus, current_bus, pci_devfn,
PCI_PREF_MEMORY_LIMIT, 0);
}
static void __init
pciauto_postscan_setup_bridge(struct pci_channel *hose,
int top_bus,
int current_bus,
int pci_devfn,
int sub_bus)
{
u32 temp;
/*
* [jsun] we always bump up baselines a little, so that if there
* nothing behind P2P bridge, we don't wind up overlapping IO/MEM
* spaces.
*/
pciauto_lower_memspc += 1;
pciauto_lower_iospc += 1;
/* Configure bus number registers */
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_SUBORDINATE_BUS, sub_bus);
/* Set upper limit of address range behind bridge. */
early_write_config_word(hose, top_bus, current_bus, pci_devfn,
PCI_MEMORY_LIMIT, pciauto_lower_memspc >> 16);
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_IO_LIMIT, (pciauto_lower_iospc & 0x0000f000) >> 8);
early_write_config_word(hose, top_bus, current_bus, pci_devfn,
PCI_IO_LIMIT_UPPER16, pciauto_lower_iospc >> 16);
/* Align memory and I/O to 1MB and 4KB boundaries. */
pciauto_lower_memspc = (pciauto_lower_memspc + (0x100000 - 1))
& ~(0x100000 - 1);
pciauto_lower_iospc = (pciauto_lower_iospc + (0x1000 - 1))
& ~(0x1000 - 1);
/* Enable memory and I/O accesses, enable bus master */
early_read_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_COMMAND, &temp);
early_write_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_COMMAND, temp | PCI_COMMAND_IO | PCI_COMMAND_MEMORY
| PCI_COMMAND_MASTER);
}
static void __init
pciauto_prescan_setup_cardbus_bridge(struct pci_channel *hose,
int top_bus,
int current_bus,
int pci_devfn,
int sub_bus)
{
/* Configure bus number registers */
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_PRIMARY_BUS, current_bus);
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_SECONDARY_BUS, sub_bus + 1);
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_SUBORDINATE_BUS, 0xff);
/* Align memory and I/O to 4KB and 4 byte boundaries. */
pciauto_lower_memspc = (pciauto_lower_memspc + (0x1000 - 1))
& ~(0x1000 - 1);
pciauto_lower_iospc = (pciauto_lower_iospc + (0x4 - 1))
& ~(0x4 - 1);
early_write_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_CB_MEMORY_BASE_0, pciauto_lower_memspc);
early_write_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_CB_IO_BASE_0, pciauto_lower_iospc);
}
static void __init
pciauto_postscan_setup_cardbus_bridge(struct pci_channel *hose,
int top_bus,
int current_bus,
int pci_devfn,
int sub_bus)
{
u32 temp;
/*
* [jsun] we always bump up baselines a little, so that if there
* nothing behind P2P bridge, we don't wind up overlapping IO/MEM
* spaces.
*/
pciauto_lower_memspc += 1;
pciauto_lower_iospc += 1;
/*
* Configure subordinate bus number. The PCI subsystem
* bus scan will renumber buses (reserving three additional
* for this PCI<->CardBus bridge for the case where a CardBus
* adapter contains a P2P or CB2CB bridge.
*/
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_SUBORDINATE_BUS, sub_bus);
/*
* Reserve an additional 4MB for mem space and 16KB for
* I/O space. This should cover any additional space
* requirement of unusual CardBus devices with
* additional bridges that can consume more address space.
*
* Although pcmcia-cs currently will reprogram bridge
* windows, the goal is to add an option to leave them
* alone and use the bridge window ranges as the regions
* that are searched for free resources upon hot-insertion
* of a device. This will allow a PCI<->CardBus bridge
* configured by this routine to happily live behind a
* P2P bridge in a system.
*/
/* Align memory and I/O to 4KB and 4 byte boundaries. */
pciauto_lower_memspc = (pciauto_lower_memspc + (0x1000 - 1))
& ~(0x1000 - 1);
pciauto_lower_iospc = (pciauto_lower_iospc + (0x4 - 1))
& ~(0x4 - 1);
/* Set up memory and I/O filter limits, assume 32-bit I/O space */
early_write_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_CB_MEMORY_LIMIT_0, pciauto_lower_memspc - 1);
early_write_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_CB_IO_LIMIT_0, pciauto_lower_iospc - 1);
/* Enable memory and I/O accesses, enable bus master */
early_read_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_COMMAND, &temp);
early_write_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_COMMAND, temp | PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER);
}
#define PCIAUTO_IDE_MODE_MASK 0x05
static int __init
pciauto_bus_scan(struct pci_channel *hose, int top_bus, int current_bus)
{
int sub_bus;
u32 pci_devfn, pci_class, cmdstat, found_multi=0;
unsigned short vid, did;
unsigned char header_type;
int devfn_start = 0;
int devfn_stop = 0xff;
sub_bus = current_bus;
if (hose->first_devfn)
devfn_start = hose->first_devfn;
if (hose->last_devfn)
devfn_stop = hose->last_devfn;
for (pci_devfn=devfn_start; pci_devfn<devfn_stop; pci_devfn++) {
if (PCI_FUNC(pci_devfn) && !found_multi)
continue;
early_read_config_word(hose, top_bus, current_bus, pci_devfn,
PCI_VENDOR_ID, &vid);
if (vid == 0xffff) continue;
early_read_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_HEADER_TYPE, &header_type);
if (!PCI_FUNC(pci_devfn))
found_multi = header_type & 0x80;
early_read_config_word(hose, top_bus, current_bus, pci_devfn,
PCI_DEVICE_ID, &did);
early_read_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_CLASS_REVISION, &pci_class);
DBG("%.2x:%.2x.%x Class %.4x: %.4x:%.4x",
current_bus, PCI_SLOT(pci_devfn), PCI_FUNC(pci_devfn),
pci_class >> 16, vid, did);
if (pci_class & 0xff)
DBG(" (rev %.2x)", pci_class & 0xff);
DBG("\n");
if ((pci_class >> 16) == PCI_CLASS_BRIDGE_PCI) {
DBG(" Bridge: primary=%.2x, secondary=%.2x\n",
current_bus, sub_bus + 1);
pciauto_prescan_setup_bridge(hose, top_bus, current_bus,
pci_devfn, sub_bus);
DBG("Scanning sub bus %.2x, I/O 0x%.8x, Mem 0x%.8x\n",
sub_bus + 1,
pciauto_lower_iospc, pciauto_lower_memspc);
sub_bus = pciauto_bus_scan(hose, top_bus, sub_bus+1);
DBG("Back to bus %.2x\n", current_bus);
pciauto_postscan_setup_bridge(hose, top_bus, current_bus,
pci_devfn, sub_bus);
continue;
} else if ((pci_class >> 16) == PCI_CLASS_BRIDGE_CARDBUS) {
DBG(" CARDBUS Bridge: primary=%.2x, secondary=%.2x\n",
current_bus, sub_bus + 1);
DBG("PCI Autoconfig: Found CardBus bridge, device %d function %d\n", PCI_SLOT(pci_devfn), PCI_FUNC(pci_devfn));
/* Place CardBus Socket/ExCA registers */
pciauto_setup_bars(hose, top_bus, current_bus, pci_devfn, PCI_BASE_ADDRESS_0);
pciauto_prescan_setup_cardbus_bridge(hose, top_bus,
current_bus, pci_devfn, sub_bus);
DBG("Scanning sub bus %.2x, I/O 0x%.8x, Mem 0x%.8x\n",
sub_bus + 1,
pciauto_lower_iospc, pciauto_lower_memspc);
sub_bus = pciauto_bus_scan(hose, top_bus, sub_bus+1);
DBG("Back to bus %.2x, sub_bus is %x\n", current_bus, sub_bus);
pciauto_postscan_setup_cardbus_bridge(hose, top_bus,
current_bus, pci_devfn, sub_bus);
continue;
} else if ((pci_class >> 16) == PCI_CLASS_STORAGE_IDE) {
unsigned char prg_iface;
early_read_config_byte(hose, top_bus, current_bus,
pci_devfn, PCI_CLASS_PROG, &prg_iface);
if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) {
DBG("Skipping legacy mode IDE controller\n");
continue;
}
}
/*
* Found a peripheral, enable some standard
* settings
*/
early_read_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_COMMAND, &cmdstat);
early_write_config_dword(hose, top_bus, current_bus, pci_devfn,
PCI_COMMAND, cmdstat | PCI_COMMAND_IO |
PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER);
#if !defined(CONFIG_SH_HS7751RVOIP) && !defined(CONFIG_SH_RTS7751R2D)
early_write_config_byte(hose, top_bus, current_bus, pci_devfn,
PCI_LATENCY_TIMER, 0x80);
#endif
/* Allocate PCI I/O and/or memory space */
pciauto_setup_bars(hose, top_bus, current_bus, pci_devfn, PCI_BASE_ADDRESS_5);
}
return sub_bus;
}
int __init
pciauto_assign_resources(int busno, struct pci_channel *hose)
{
/* setup resource limits */
io_resource_inuse = hose->io_resource;
mem_resource_inuse = hose->mem_resource;
pciauto_lower_iospc = io_resource_inuse->start;
pciauto_upper_iospc = io_resource_inuse->end + 1;
pciauto_lower_memspc = mem_resource_inuse->start;
pciauto_upper_memspc = mem_resource_inuse->end + 1;
DBG("Autoconfig PCI channel 0x%p\n", hose);
DBG("Scanning bus %.2x, I/O 0x%.8x:0x%.8x, Mem 0x%.8x:0x%.8x\n",
busno, pciauto_lower_iospc, pciauto_upper_iospc,
pciauto_lower_memspc, pciauto_upper_memspc);
return pciauto_bus_scan(hose, busno, busno);
}
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