patch-2.4.20 linux-2.4.20/arch/ppc/kernel/pmac_pci.c
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- Lines: 616
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
linux-2.4.19/arch/ppc/kernel/pmac_pci.c
- Orig date:
Fri Aug 2 17:39:43 2002
diff -urN linux-2.4.19/arch/ppc/kernel/pmac_pci.c linux-2.4.20/arch/ppc/kernel/pmac_pci.c
@@ -1,615 +0,0 @@
-/*
- * BK Id: SCCS/s.pmac_pci.c 1.35 05/06/02 01:37:30 benh
- */
-/*
- * Support for PCI bridges found on Power Macintoshes.
- * At present the "bandit" and "chaos" bridges are supported.
- * Fortunately you access configuration space in the same
- * way with either bridge.
- *
- * Copyright (C) 1997 Paul Mackerras (paulus@cs.anu.edu.au)
- *
- * 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.
- */
-
-#include <linux/kernel.h>
-#include <linux/pci.h>
-#include <linux/delay.h>
-#include <linux/string.h>
-#include <linux/init.h>
-#include <linux/bootmem.h>
-
-#include <asm/sections.h>
-#include <asm/io.h>
-#include <asm/prom.h>
-#include <asm/pci-bridge.h>
-#include <asm/machdep.h>
-#include <asm/pmac_feature.h>
-
-#include "pci.h"
-
-#undef DEBUG
-
-static void add_bridges(struct device_node *dev);
-
-/* XXX Could be per-controller, but I don't think we risk anything by
- * assuming we won't have both UniNorth and Bandit */
-static int has_uninorth;
-
-/*
- * Magic constants for enabling cache coherency in the bandit/PSX bridge.
- */
-#define BANDIT_DEVID_2 8
-#define BANDIT_REVID 3
-
-#define BANDIT_DEVNUM 11
-#define BANDIT_MAGIC 0x50
-#define BANDIT_COHERENT 0x40
-
-static int __init
-fixup_one_level_bus_range(struct device_node *node, int higher)
-{
- for (; node != 0;node = node->sibling) {
- int * bus_range;
- unsigned int *class_code;
- int len;
-
- /* For PCI<->PCI bridges or CardBus bridges, we go down */
- class_code = (unsigned int *) get_property(node, "class-code", 0);
- if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
- (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
- continue;
- bus_range = (int *) get_property(node, "bus-range", &len);
- if (bus_range != NULL && len > 2 * sizeof(int)) {
- if (bus_range[1] > higher)
- higher = bus_range[1];
- }
- higher = fixup_one_level_bus_range(node->child, higher);
- }
- return higher;
-}
-
-/* This routine fixes the "bus-range" property of all bridges in the
- * system since they tend to have their "last" member wrong on macs
- *
- * Note that the bus numbers manipulated here are OF bus numbers, they
- * are not Linux bus numbers.
- */
-static void __init
-fixup_bus_range(struct device_node *bridge)
-{
- int * bus_range;
- int len;
-
- /* Lookup the "bus-range" property for the hose */
- bus_range = (int *) get_property(bridge, "bus-range", &len);
- if (bus_range == NULL || len < 2 * sizeof(int)) {
- printk(KERN_WARNING "Can't get bus-range for %s\n",
- bridge->full_name);
- return;
- }
- bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
-}
-
-/*
- * Apple MacRISC (UniNorth, Bandit, Chaos) PCI controllers.
- *
- * The "Bandit" version is present in all early PCI PowerMacs,
- * and up to the first ones using Grackle. Some machines may
- * have 2 bandit controllers (2 PCI busses).
- *
- * "Chaos" is used in some "Bandit"-type machines as a bridge
- * for the separate display bus. It is accessed the same
- * way as bandit, but cannot be probed for devices. It therefore
- * has its own config access functions.
- *
- * The "UniNorth" version is present in all Core99 machines
- * (iBook, G4, new IMacs, and all the recent Apple machines).
- * It contains 3 controllers in one ASIC.
- */
-
-#define MACRISC_CFA0(devfn, off) \
- ((1 << (unsigned long)PCI_SLOT(dev_fn)) \
- | (((unsigned long)PCI_FUNC(dev_fn)) << 8) \
- | (((unsigned long)(off)) & 0xFCUL))
-
-#define MACRISC_CFA1(bus, devfn, off) \
- ((((unsigned long)(bus)) << 16) \
- |(((unsigned long)(devfn)) << 8) \
- |(((unsigned long)(off)) & 0xFCUL) \
- |1UL)
-
-static unsigned int __pmac
-macrisc_cfg_access(struct pci_controller* hose, u8 bus, u8 dev_fn, u8 offset)
-{
- unsigned int caddr;
-
- if (bus == hose->first_busno) {
- if (dev_fn < (11 << 3))
- return 0;
- caddr = MACRISC_CFA0(dev_fn, offset);
- } else
- caddr = MACRISC_CFA1(bus, dev_fn, offset);
-
- /* Uninorth will return garbage if we don't read back the value ! */
- do {
- out_le32(hose->cfg_addr, caddr);
- } while(in_le32(hose->cfg_addr) != caddr);
-
- offset &= has_uninorth ? 0x07 : 0x03;
- return (unsigned int)(hose->cfg_data) + (unsigned int)offset;
-}
-
-#define cfg_read(val, addr, type, op, op2) \
- *val = op((type)(addr))
-#define cfg_write(val, addr, type, op, op2) \
- op((type *)(addr), (val)); (void) op2((type *)(addr))
-
-#define cfg_read_bad(val, size) *val = bad_##size;
-#define cfg_write_bad(val, size)
-
-#define bad_byte 0xff
-#define bad_word 0xffff
-#define bad_dword 0xffffffffU
-
-#define MACRISC_PCI_OP(rw, size, type, op, op2) \
-static int __pmac \
-macrisc_##rw##_config_##size(struct pci_dev *dev, int off, type val) \
-{ \
- struct pci_controller *hose = dev->sysdata; \
- unsigned int addr; \
- \
- addr = macrisc_cfg_access(hose, dev->bus->number, dev->devfn, off); \
- if (!addr) { \
- cfg_##rw##_bad(val, size) \
- return PCIBIOS_DEVICE_NOT_FOUND; \
- } \
- cfg_##rw(val, addr, type, op, op2); \
- return PCIBIOS_SUCCESSFUL; \
-}
-
-MACRISC_PCI_OP(read, byte, u8 *, in_8, x)
-MACRISC_PCI_OP(read, word, u16 *, in_le16, x)
-MACRISC_PCI_OP(read, dword, u32 *, in_le32, x)
-MACRISC_PCI_OP(write, byte, u8, out_8, in_8)
-MACRISC_PCI_OP(write, word, u16, out_le16, in_le16)
-MACRISC_PCI_OP(write, dword, u32, out_le32, in_le32)
-
-static struct pci_ops macrisc_pci_ops =
-{
- macrisc_read_config_byte,
- macrisc_read_config_word,
- macrisc_read_config_dword,
- macrisc_write_config_byte,
- macrisc_write_config_word,
- macrisc_write_config_dword
-};
-
-/*
- * Verifiy that a specific (bus, dev_fn) exists on chaos
- */
-static int __pmac
-chaos_validate_dev(struct pci_dev *dev, int offset)
-{
- if(pci_device_to_OF_node(dev) == 0)
- return PCIBIOS_DEVICE_NOT_FOUND;
- if((dev->vendor == 0x106b) && (dev->device == 3) && (offset >= 0x10) &&
- (offset != 0x14) && (offset != 0x18) && (offset <= 0x24)) {
- return PCIBIOS_BAD_REGISTER_NUMBER;
- }
- return PCIBIOS_SUCCESSFUL;
-}
-
-#define CHAOS_PCI_OP(rw, size, type) \
-static int __pmac \
-chaos_##rw##_config_##size(struct pci_dev *dev, int off, type val) \
-{ \
- int result = chaos_validate_dev(dev, off); \
- if(result == PCIBIOS_BAD_REGISTER_NUMBER) { \
- cfg_##rw##_bad(val, size) \
- return PCIBIOS_BAD_REGISTER_NUMBER; \
- } \
- if(result == PCIBIOS_SUCCESSFUL) \
- return macrisc_##rw##_config_##size(dev, off, val); \
- return result; \
-}
-
-CHAOS_PCI_OP(read, byte, u8 *)
-CHAOS_PCI_OP(read, word, u16 *)
-CHAOS_PCI_OP(read, dword, u32 *)
-CHAOS_PCI_OP(write, byte, u8)
-CHAOS_PCI_OP(write, word, u16)
-CHAOS_PCI_OP(write, dword, u32)
-
-static struct pci_ops chaos_pci_ops =
-{
- chaos_read_config_byte,
- chaos_read_config_word,
- chaos_read_config_dword,
- chaos_write_config_byte,
- chaos_write_config_word,
- chaos_write_config_dword
-};
-
-
-/*
- * For a bandit bridge, turn on cache coherency if necessary.
- * N.B. we could clean this up using the hose ops directly.
- */
-static void __init
-init_bandit(struct pci_controller *bp)
-{
- unsigned int vendev, magic;
- int rev;
-
- /* read the word at offset 0 in config space for device 11 */
- out_le32(bp->cfg_addr, (1UL << BANDIT_DEVNUM) + PCI_VENDOR_ID);
- udelay(2);
- vendev = in_le32((volatile unsigned int *)bp->cfg_data);
- if (vendev == (PCI_DEVICE_ID_APPLE_BANDIT << 16) +
- PCI_VENDOR_ID_APPLE) {
- /* read the revision id */
- out_le32(bp->cfg_addr,
- (1UL << BANDIT_DEVNUM) + PCI_REVISION_ID);
- udelay(2);
- rev = in_8(bp->cfg_data);
- if (rev != BANDIT_REVID)
- printk(KERN_WARNING
- "Unknown revision %d for bandit\n", rev);
- } else if (vendev != (BANDIT_DEVID_2 << 16) + PCI_VENDOR_ID_APPLE) {
- printk(KERN_WARNING "bandit isn't? (%x)\n", vendev);
- return;
- }
-
- /* read the word at offset 0x50 */
- out_le32(bp->cfg_addr, (1UL << BANDIT_DEVNUM) + BANDIT_MAGIC);
- udelay(2);
- magic = in_le32((volatile unsigned int *)bp->cfg_data);
- if ((magic & BANDIT_COHERENT) != 0)
- return;
- magic |= BANDIT_COHERENT;
- udelay(2);
- out_le32((volatile unsigned int *)bp->cfg_data, magic);
- printk(KERN_INFO "Cache coherency enabled for bandit/PSX\n");
-}
-
-
-/*
- * Tweak the PCI-PCI bridge chip on the blue & white G3s.
- */
-static void __init
-init_p2pbridge(void)
-{
- struct device_node *p2pbridge;
- struct pci_controller* hose;
- u8 bus, devfn;
- u16 val;
-
- /* XXX it would be better here to identify the specific
- PCI-PCI bridge chip we have. */
- if ((p2pbridge = find_devices("pci-bridge")) == 0
- || p2pbridge->parent == NULL
- || strcmp(p2pbridge->parent->name, "pci") != 0)
- return;
- if (pci_device_from_OF_node(p2pbridge, &bus, &devfn) < 0) {
-#ifdef DEBUG
- printk("Can't find PCI infos for PCI<->PCI bridge\n");
-#endif
- return;
- }
- /* Warning: At this point, we have not yet renumbered all busses.
- * So we must use OF walking to find out hose
- */
- hose = pci_find_hose_for_OF_device(p2pbridge);
- if (!hose) {
-#ifdef DEBUG
- printk("Can't find hose for PCI<->PCI bridge\n");
-#endif
- return;
- }
- if (early_read_config_word(hose, bus, devfn,
- PCI_BRIDGE_CONTROL, &val) < 0) {
- printk(KERN_ERR "init_p2pbridge: couldn't read bridge control\n");
- return;
- }
- val &= ~PCI_BRIDGE_CTL_MASTER_ABORT;
- early_write_config_word(hose, bus, devfn, PCI_BRIDGE_CONTROL, val);
-}
-
-void __init
-pmac_find_bridges(void)
-{
- add_bridges(find_devices("bandit"));
- add_bridges(find_devices("chaos"));
- add_bridges(find_devices("pci"));
- init_p2pbridge();
-}
-
-#define GRACKLE_CFA(b, d, o) (0x80 | ((b) << 8) | ((d) << 16) \
- | (((o) & ~3) << 24))
-
-#define GRACKLE_PICR1_STG 0x00000040
-#define GRACKLE_PICR1_LOOPSNOOP 0x00000010
-
-/* N.B. this is called before bridges is initialized, so we can't
- use grackle_pcibios_{read,write}_config_dword. */
-static inline void grackle_set_stg(struct pci_controller* bp, int enable)
-{
- unsigned int val;
-
- out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
- val = in_le32((volatile unsigned int *)bp->cfg_data);
- val = enable? (val | GRACKLE_PICR1_STG) :
- (val & ~GRACKLE_PICR1_STG);
- out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
- out_le32((volatile unsigned int *)bp->cfg_data, val);
- (void)in_le32((volatile unsigned int *)bp->cfg_data);
-}
-
-static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
-{
- unsigned int val;
-
- out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
- val = in_le32((volatile unsigned int *)bp->cfg_data);
- val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) :
- (val & ~GRACKLE_PICR1_LOOPSNOOP);
- out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
- out_le32((volatile unsigned int *)bp->cfg_data, val);
- (void)in_le32((volatile unsigned int *)bp->cfg_data);
-}
-
-static int __init
-setup_uninorth(struct pci_controller* hose, struct reg_property* addr)
-{
- pci_assign_all_busses = 1;
- has_uninorth = 1;
- hose->ops = ¯isc_pci_ops;
- hose->cfg_addr = ioremap(addr->address + 0x800000, 0x1000);
- hose->cfg_data = ioremap(addr->address + 0xc00000, 0x1000);
- /* We "know" that the bridge at f2000000 has the PCI slots. */
- return addr->address == 0xf2000000;
-}
-
-static void __init
-setup_bandit(struct pci_controller* hose, struct reg_property* addr)
-{
- hose->ops = ¯isc_pci_ops;
- hose->cfg_addr = (volatile unsigned int *)
- ioremap(addr->address + 0x800000, 0x1000);
- hose->cfg_data = (volatile unsigned char *)
- ioremap(addr->address + 0xc00000, 0x1000);
- init_bandit(hose);
-}
-
-static void __init
-setup_chaos(struct pci_controller* hose, struct reg_property* addr)
-{
- /* assume a `chaos' bridge */
- hose->ops = &chaos_pci_ops;
- hose->cfg_addr = (volatile unsigned int *)
- ioremap(addr->address + 0x800000, 0x1000);
- hose->cfg_data = (volatile unsigned char *)
- ioremap(addr->address + 0xc00000, 0x1000);
-}
-
-void __init
-setup_grackle(struct pci_controller *hose)
-{
- setup_indirect_pci(hose, 0xfec00000, 0xfee00000);
- if (machine_is_compatible("AAPL,PowerBook1998"))
- grackle_set_loop_snoop(hose, 1);
-#if 0 /* Disabled for now, HW problems ??? */
- grackle_set_stg(hose, 1);
-#endif
-}
-
-/*
- * We assume that if we have a G3 powermac, we have one bridge called
- * "pci" (a MPC106) and no bandit or chaos bridges, and contrariwise,
- * if we have one or more bandit or chaos bridges, we don't have a MPC106.
- */
-static void __init
-add_bridges(struct device_node *dev)
-{
- int len;
- struct pci_controller *hose;
- struct reg_property *addr;
- char* disp_name;
- int *bus_range;
- int first = 1, primary;
-
- for (; dev != NULL; dev = dev->next) {
- addr = (struct reg_property *) get_property(dev, "reg", &len);
- if (addr == NULL || len < sizeof(*addr)) {
- printk(KERN_WARNING "Can't use %s: no address\n",
- dev->full_name);
- continue;
- }
- bus_range = (int *) get_property(dev, "bus-range", &len);
- if (bus_range == NULL || len < 2 * sizeof(int)) {
- printk(KERN_WARNING "Can't get bus-range for %s, assume bus 0\n",
- dev->full_name);
- }
-
- hose = pcibios_alloc_controller();
- if (!hose)
- continue;
- hose->arch_data = dev;
- hose->first_busno = bus_range ? bus_range[0] : 0;
- hose->last_busno = bus_range ? bus_range[1] : 0xff;
-
- disp_name = NULL;
- primary = first;
- if (device_is_compatible(dev, "uni-north")) {
- primary = setup_uninorth(hose, addr);
- disp_name = "UniNorth";
- } else if (strcmp(dev->name, "pci") == 0) {
- /* XXX assume this is a mpc106 (grackle) */
- setup_grackle(hose);
- disp_name = "Grackle (MPC106)";
- } else if (strcmp(dev->name, "bandit") == 0) {
- setup_bandit(hose, addr);
- disp_name = "Bandit";
- } else if (strcmp(dev->name, "chaos") == 0) {
- setup_chaos(hose, addr);
- disp_name = "Chaos";
- primary = 0;
- }
- printk(KERN_INFO "Found %s PCI host bridge at 0x%08x. Firmware bus number: %d->%d\n",
- disp_name, addr->address, hose->first_busno, hose->last_busno);
-#ifdef DEBUG
- printk(" ->Hose at 0x%08lx, cfg_addr=0x%08lx,cfg_data=0x%08lx\n",
- hose, hose->cfg_addr, hose->cfg_data);
-#endif
-
- /* Interpret the "ranges" property */
- /* This also maps the I/O region and sets isa_io/mem_base */
- pci_process_bridge_OF_ranges(hose, dev, primary);
-
- /* Fixup "bus-range" OF property */
- fixup_bus_range(dev);
-
- first &= !primary;
- }
-}
-
-static void __init
-pcibios_fixup_OF_interrupts(void)
-{
- struct pci_dev* dev;
-
- /*
- * Open Firmware often doesn't initialize the
- * PCI_INTERRUPT_LINE config register properly, so we
- * should find the device node and apply the interrupt
- * obtained from the OF device-tree
- */
- pci_for_each_dev(dev) {
- struct device_node* node = pci_device_to_OF_node(dev);
- /* this is the node, see if it has interrupts */
- if (node && node->n_intrs > 0)
- dev->irq = node->intrs[0].line;
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
- }
-}
-
-void __init
-pmac_pcibios_fixup(void)
-{
- /* Fixup interrupts according to OF tree */
- pcibios_fixup_OF_interrupts();
-}
-
-int __pmac
-pmac_pci_enable_device_hook(struct pci_dev *dev, int initial)
-{
- struct device_node* node;
- int updatecfg = 0;
- int uninorth_child;
-
- node = pci_device_to_OF_node(dev);
-
- /* We don't want to enable USB controllers absent from the OF tree
- * (iBook second controller)
- */
- if (dev->vendor == PCI_VENDOR_ID_APPLE
- && dev->device == PCI_DEVICE_ID_APPLE_KL_USB && !node)
- return -EINVAL;
-
- if (!node)
- return 0;
-
- uninorth_child = node->parent &&
- device_is_compatible(node->parent, "uni-north");
-
- /* Firewire & GMAC were disabled after PCI probe, the driver is
- * claiming them, we must re-enable them now.
- */
- if (uninorth_child && !strcmp(node->name, "firewire") &&
- (device_is_compatible(node, "pci106b,18") ||
- device_is_compatible(node, "pci106b,30") ||
- device_is_compatible(node, "pci11c1,5811"))) {
- pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, node, 0, 1);
- pmac_call_feature(PMAC_FTR_1394_ENABLE, node, 0, 1);
- updatecfg = 1;
- }
- if (uninorth_child && !strcmp(node->name, "ethernet") &&
- device_is_compatible(node, "gmac")) {
- pmac_call_feature(PMAC_FTR_GMAC_ENABLE, node, 0, 1);
- updatecfg = 1;
- }
-
- if (updatecfg) {
- u16 cmd;
-
- /*
- * Make sure PCI is correctly configured
- *
- * We use old pci_bios versions of the function since, by
- * default, gmac is not powered up, and so will be absent
- * from the kernel initial PCI lookup.
- *
- * Should be replaced by 2.4 new PCI mecanisms and really
- * regiser the device.
- */
- pci_read_config_word(dev, PCI_COMMAND, &cmd);
- cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;
- pci_write_config_word(dev, PCI_COMMAND, cmd);
- pci_write_config_byte(dev, PCI_LATENCY_TIMER, 16);
- pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 8);
- }
-
- return 0;
-}
-
-/* We power down some devices after they have been probed. They'll
- * be powered back on later on
- */
-void __init
-pmac_pcibios_after_init(void)
-{
- struct device_node* nd;
-
-#ifdef CONFIG_BLK_DEV_IDE
- struct pci_dev *dev;
-
- /* OF fails to initialize IDE controllers on macs
- * (and maybe other machines)
- *
- * Ideally, this should be moved to the IDE layer, but we need
- * to check specifically with Andre Hedrick how to do it cleanly
- * since the common IDE code seem to care about the fact that the
- * BIOS may have disabled a controller.
- *
- * -- BenH
- */
- pci_for_each_dev(dev) {
- if ((dev->class >> 16) == PCI_BASE_CLASS_STORAGE)
- pci_enable_device(dev);
- }
-#endif /* CONFIG_BLK_DEV_IDE */
-
- nd = find_devices("firewire");
- while (nd) {
- if (nd->parent && (device_is_compatible(nd, "pci106b,18") ||
- device_is_compatible(nd, "pci106b,30") ||
- device_is_compatible(nd, "pci11c1,5811"))
- && device_is_compatible(nd->parent, "uni-north")) {
- pmac_call_feature(PMAC_FTR_1394_ENABLE, nd, 0, 0);
- pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, nd, 0, 0);
- }
- nd = nd->next;
- }
- nd = find_devices("ethernet");
- while (nd) {
- if (nd->parent && device_is_compatible(nd, "gmac")
- && device_is_compatible(nd->parent, "uni-north"))
- pmac_call_feature(PMAC_FTR_GMAC_ENABLE, nd, 0, 0);
- nd = nd->next;
- }
-}
-
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