// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Support for PCI bridges found on Power Macintoshes.
*
* Copyright (C) 2003-2005 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
* Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/grackle.h>
#include <asm/ppc-pci.h>
#include "pmac.h"
#undef DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif
/* 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;
#ifdef CONFIG_PPC64
static struct pci_controller *u3_agp;
#else
static int has_second_ohare;
#endif /* CONFIG_PPC64 */
extern int pcibios_assign_bus_offset;
struct device_node *k2_skiplist[2];
/*
* 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; node = node->sibling) {
const int * bus_range;
const unsigned int *class_code;
int len;
/* For PCI<->PCI bridges or CardBus bridges, we go down */
class_code = of_get_property(node, "class-code", NULL);
if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
continue;
bus_range = of_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, len;
struct property *prop;
/* Lookup the "bus-range" property for the hose */
prop = of_find_property(bridge, "bus-range", &len);
if (prop == NULL || prop->length < 2 * sizeof(int))
return;
bus_range = prop->value;
bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
}
/*
* Apple MacRISC (U3, 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.
*
* The U3 is the bridge used on G5 machines. It contains an
* AGP bus which is dealt with the old UniNorth access routines
* and a HyperTransport bus which uses its own set of access
* functions.
*/
#define MACRISC_CFA0(devfn, off) \
((1 << (unsigned int)PCI_SLOT(dev_fn)) \
| (((unsigned int)PCI_FUNC(dev_fn)) << 8) \
| (((unsigned int)(off)) & 0xFCUL))
#define MACRISC_CFA1(bus, devfn, off) \
((((unsigned int)(bus)) << 16) \
|(((unsigned int)(devfn)) << 8) \
|(((unsigned int)(off)) & 0xFCUL) \
|1UL)
static void __iomem *macrisc_cfg_map_bus(struct pci_bus *bus,
unsigned int dev_fn,
int offset)
{
unsigned int caddr;
struct pci_controller *hose;
hose = pci_bus_to_host(bus);
if (hose == NULL)
return NULL;
if (bus->number == hose->first_busno) {
if (dev_fn < (11 << 3))
return NULL;
caddr = MACRISC_CFA0(dev_fn, offset);
} else
caddr = MACRISC_CFA1(bus->number, 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 hose->cfg_data + offset;
}
static struct pci_ops macrisc_pci_ops =
{
.map_bus = macrisc_cfg_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
};
#ifdef CONFIG_PPC32
/*
* Verify that a specific (bus, dev_fn) exists on chaos
*/
static void __iomem *chaos_map_bus(struct pci_bus *bus, unsigned int devfn,
int offset)
{
struct device_node *np;
const u32 *vendor, *device;
if (offset >= 0x100)
return NULL;
np = of_pci_find_child_device(bus->dev.of_node, devfn);
if (np == NULL)
return NULL;
vendor = of_get_property(np, "vendor-id", NULL);
device = of_get_property(np, "device-id", NULL);
if (vendor == NULL || device == NULL)
return NULL;
if ((*vendor == 0x106b) && (*device == 3) && (offset >= 0x10)
&& (offset != 0x14) && (offset != 0x18) && (offset <= 0x24))
return NULL;
return macrisc_cfg_map_bus(bus, devfn, offset);
}
static struct pci_ops chaos_pci_ops =
{
.map_bus = chaos_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
};
static void __init setup_chaos(struct pci_controller *hose,
struct resource *addr)
{
/* assume a `chaos' bridge */
hose->ops = &chaos_pci_ops;
hose->cfg_addr = ioremap(addr->start + 0x800000, 0x1000);
hose->cfg_data = ioremap(addr->start + 0xc00000, 0x1000);
}
#endif /* CONFIG_PPC32 */
#ifdef CONFIG_PPC64
/*
* These versions of U3 HyperTransport config space access ops do not
* implement self-view of the HT host yet
*/
/*
* This function deals with some "special cases" devices.
*
* 0 -> No special case
* 1 -> Skip the device but act as if the access was successful
* (return 0xff's on reads, eventually, cache config space
* accesses in a later version)
* -1 -> Hide the device (unsuccessful access)
*/
static int u3_ht_skip_device(struct pci_controller *hose,
struct pci_bus *bus, unsigned int devfn)
{
struct device_node *busdn, *dn;
int i;
/* We only allow config cycles to devices that are in OF device-tree
* as we are apparently having some weird things going on with some
* revs of K2 on recent G5s, except for the host bridge itself, which
* is missing from the tree but we know we can probe.
*/
if (bus->self)
busdn = pci_device_to_OF_node(bus->self);
else if (devfn == 0)
return 0;
else
busdn = hose->dn;
for (dn = busdn->child; dn; dn = dn->sibling)
if (PCI_DN(dn) && PCI_DN(dn)->devfn == devfn)
break;
if (dn == NULL)
return -1;
/*
* When a device in K2 is powered down, we die on config
* cycle accesses. Fix that here.
*/
for (i=0; i<2; i++)
if (k2_skiplist[i] == dn)
return 1;
return 0;
}
#define U3_HT_CFA0(devfn, off) \
((((unsigned int)devfn) << 8) | offset)
#define U3_HT_CFA1(bus, devfn, off) \
(U3_HT_CFA0(devfn, off) \
+ (((unsigned int)bus) << 16) \
+ 0x01000000UL)
static void __iomem *u3_ht_cfg_access(struct pci_controller *hose, u8 bus,
u8 devfn, u8 offset, int *swap)
{
*swap = 1;
if (bus == hose->first_busno) {
if (devfn != 0)
return hose->cfg_data + U3_HT_CFA0(devfn, offset);
*swap = 0;
return ((void __iomem *)hose->cfg_addr) + (offset << 2);
} else
return hose->cfg_data + U3_HT_CFA1(bus, devfn, offset);
}
static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct pci_controller *hose;
void __iomem *addr;
int swap;
hose = pci_bus_to_host(bus);
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
if (offset >= 0x100)
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = u3_ht_cfg_access(hose, bus->number, devfn, offset, &swap);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
switch (u3_ht_skip_device(hose, bus, devfn)) {
case 0:
break;
case 1:
switch (len) {
case 1:
*val = 0xff; break;
case 2:
*val = 0xffff; break;
default:
*val = 0xfffffffful; break;
}
return PCIBIOS_SUCCESSFUL;
default:
return PCIBIOS_DEVICE_NOT_FOUND;
}
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
*val = in_8(addr);
break;
case 2:
*val = swap ? in_le16(addr) : in_be16(addr);
break;
default:
*val = swap ? in_le32(addr) : in_be32(addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 val)
{
struct pci_controller *hose;
void __iomem *addr;
int swap;
hose = pci_bus_to_host(bus);
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
if (offset >= 0x100)
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = u3_ht_cfg_access(hose, bus->number, devfn, offset, &swap);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
switch (u3_ht_skip_device(hose, bus, devfn)) {
case 0:
break;
case 1:
return PCIBIOS_SUCCESSFUL;
default:
return PCIBIOS_DEVICE_NOT_FOUND;
}
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
out_8(addr, val);
break;
case 2:
swap ? out_le16(addr, val) : out_be16(addr, val);
break;
default:
swap ? out_le32(addr, val) : out_be32(addr, val);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops u3_ht_pci_ops =
{
.read = u3_ht_read_config,
.write = u3_ht_write_config,
};
#define U4_PCIE_CFA0(devfn, off) \
((1 << ((unsigned int)PCI_SLOT(dev_fn))) \
| (((unsigned int)PCI_FUNC(dev_fn)) << 8) \
| ((((unsigned int)(off)) >> 8) << 28) \
| (((unsigned int)(off)) & 0xfcU))
#define U4_PCIE_CFA1(bus, devfn, off) \
((((unsigned int)(bus)) << 16) \
|(((unsigned int)(devfn)) << 8) \
| ((((unsigned int)(off)) >> 8) << 28) \
|(((unsigned int)(off)) & 0xfcU) \
|1UL)
static void __iomem *u4_pcie_cfg_map_bus(struct pci_bus *bus,
unsigned int dev_fn,
int offset)
{
struct pci_controller *hose;
unsigned int caddr;
if (offset >= 0x1000)
return NULL;
hose = pci_bus_to_host(bus);
if (!hose)
return NULL;
if (bus->number == hose->first_busno) {
caddr = U4_PCIE_CFA0(dev_fn, offset);
} else
caddr = U4_PCIE_CFA1(bus->number, 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 &= 0x03;
return hose->cfg_data + offset;
}
static struct pci_ops u4_pcie_pci_ops =
{
.map_bus = u4_pcie_cfg_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
};
static void pmac_pci_fixup_u4_of_node(struct pci_dev *dev)
{
/* Apple's device-tree "hides" the root complex virtual P2P bridge
* on U4. However, Linux sees it, causing the PCI <-> OF matching
* code to fail to properly match devices below it. This works around
* it by setting the node of the bridge to point to the PHB node,
* which is not entirely correct but fixes the matching code and
* doesn't break anything else. It's also the simplest possible fix.
*/
if (dev->dev.of_node == NULL)
dev->dev.of_node = pcibios_get_phb_of_node(dev->bus);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, 0x5b, pmac_pci_fixup_u4_of_node);
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC32
/*
* 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(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(bp->cfg_data);
if ((magic & BANDIT_COHERENT) != 0)
return;
magic |= BANDIT_COHERENT;
udelay(2);
out_le32(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. */
p2pbridge = of_find_node_by_name(NULL, "pci-bridge");
if (p2pbridge == NULL || !of_node_name_eq(p2pbridge->parent, "pci"))
goto done;
if (pci_device_from_OF_node(p2pbridge, &bus, &devfn) < 0) {
DBG("Can't find PCI infos for PCI<->PCI bridge\n");
goto done;
}
/* 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) {
DBG("Can't find hose for PCI<->PCI bridge\n");
goto done;
}
if (early_read_config_word(hose, bus, devfn,
PCI_BRIDGE_CONTROL, &val) < 0) {
printk(KERN_ERR "init_p2pbridge: couldn't read bridge"
" control\n");
goto done;
}
val &= ~PCI_BRIDGE_CTL_MASTER_ABORT;
early_write_config_word(hose, bus, devfn, PCI_BRIDGE_CONTROL, val);
done:
of_node_put(p2pbridge);
}
static void __init init_second_ohare(void)
{
struct device_node *np = of_find_node_by_name(NULL, "pci106b,7");
unsigned char bus, devfn;
unsigned short cmd;
if (np == NULL)
return;
/* This must run before we initialize the PICs since the second
* ohare hosts a PIC that will be accessed there.
*/
if (pci_device_from_OF_node(np, &bus, &devfn) == 0) {
struct pci_controller* hose =
pci_find_hose_for_OF_device(np);
if (!hose) {
printk(KERN_ERR "Can't find PCI hose for OHare2 !\n");
of_node_put(np);
return;
}
early_read_config_word(hose, bus, devfn, PCI_COMMAND, &cmd);
cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
cmd &= ~PCI_COMMAND_IO;
early_write_config_word(hose, bus, devfn, PCI_COMMAND, cmd);
}
has_second_ohare = 1;
of_node_put(np);
}
/*
* Some Apple desktop machines have a NEC PD720100A USB2 controller
* on the motherboard. Open Firmware, on these, will disable the
* EHCI part of it so it behaves like a pair of OHCI's. This fixup
* code re-enables it ;)
*/
static void __init fixup_nec_usb2(void)
{
struct device_node *nec;
for_each_node_by_name(nec, "usb") {
struct pci_controller *hose;
u32 data;
const u32 *prop;
u8 bus, devfn;
prop = of_get_property(nec, "vendor-id", NULL);
if (prop == NULL)
continue;
if (0x1033 != *prop)
continue;
prop = of_get_property(nec, "device-id", NULL);
if (prop == NULL)
continue;
if (0x0035 != *prop)
continue;
prop = of_get_property(nec, "reg", NULL);
if (prop == NULL)
continue;
devfn = (prop[0] >> 8) & 0xff;
bus = (prop[0] >> 16) & 0xff;
if (PCI_FUNC(devfn) != 0)
continue;
hose = pci_find_hose_for_OF_device(nec);
if (!hose)
continue;
early_read_config_dword(hose, bus, devfn, 0xe4, &data);
if (data & 1UL) {
printk("Found NEC PD720100A USB2 chip with disabled"
" EHCI, fixing up...\n");
data &= ~1UL;
early_write_config_dword(hose, bus, devfn, 0xe4, data);
}
}
}
static void __init setup_bandit(struct pci_controller *hose,
struct resource *addr)
{
hose->ops = ¯isc_pci_ops;
hose->cfg_addr = ioremap(addr->start + 0x800000, 0x1000);
hose->cfg_data = ioremap(addr->start + 0xc00000, 0x1000);
init_bandit(hose);
}
static int __init setup_uninorth(struct pci_controller *hose,
struct resource *addr)
{
pci_add_flags(PCI_REASSIGN_ALL_BUS);
has_uninorth = 1;
hose->ops = ¯isc_pci_ops;
hose->cfg_addr = ioremap(addr->start + 0x800000, 0x1000);
hose->cfg_data = ioremap(addr->start + 0xc00000, 0x1000);
/* We "know" that the bridge at f2000000 has the PCI slots. */
return addr->start == 0xf2000000;
}
#endif /* CONFIG_PPC32 */
#ifdef CONFIG_PPC64
static void __init setup_u3_agp(struct pci_controller* hose)
{
/* On G5, we move AGP up to high bus number so we don't need
* to reassign bus numbers for HT. If we ever have P2P bridges
* on AGP, we'll have to move pci_assign_all_busses to the
* pci_controller structure so we enable it for AGP and not for
* HT childs.
* We hard code the address because of the different size of
* the reg address cell, we shall fix that by killing struct
* reg_property and using some accessor functions instead
*/
hose->first_busno = 0xf0;
hose->last_busno = 0xff;
has_uninorth = 1;
hose->ops = ¯isc_pci_ops;
hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);
u3_agp = hose;
}
static void __init setup_u4_pcie(struct pci_controller* hose)
{
/* We currently only implement the "non-atomic" config space, to
* be optimised later.
*/
hose->ops = &u4_pcie_pci_ops;
hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);
/* The bus contains a bridge from root -> device, we need to
* make it visible on bus 0 so that we pick the right type
* of config cycles. If we didn't, we would have to force all
* config cycles to be type 1. So we override the "bus-range"
* property here
*/
hose->first_busno = 0x00;
hose->last_busno = 0xff;
}
static void __init parse_region_decode(struct pci_controller *hose,
u32 decode)
{
unsigned long base, end, next = -1;
int i, cur = -1;
/* Iterate through all bits. We ignore the last bit as this region is
* reserved for the ROM among other niceties
*/
for (i = 0; i < 31; i++) {
if ((decode & (0x80000000 >> i)) == 0)
continue;
if (i < 16) {
base = 0xf0000000 | (((u32)i) << 24);
end = base + 0x00ffffff;
} else {
base = ((u32)i-16) << 28;
end = base + 0x0fffffff;
}
if (base != next) {
if (++cur >= 3) {
printk(KERN_WARNING "PCI: Too many ranges !\n");
break;
}
hose->mem_resources[cur].flags = IORESOURCE_MEM;
hose->mem_resources[cur].name = hose->dn->full_name;
hose->mem_resources[cur].start = base;
hose->mem_resources[cur].end = end;
hose->mem_offset[cur] = 0;
DBG(" %d: 0x%08lx-0x%08lx\n", cur, base, end);
} else {
DBG(" : -0x%08lx\n", end);
hose->mem_resources[cur].end = end;
}
next = end + 1;
}
}
static void __init setup_u3_ht(struct pci_controller* hose)
{
struct device_node *np = hose->dn;
struct resource cfg_res, self_res;
u32 decode;
hose->ops = &u3_ht_pci_ops;
/* Get base addresses from OF tree
*/
if (of_address_to_resource(np, 0, &cfg_res) ||
of_address_to_resource(np, 1, &self_res)) {
printk(KERN_ERR "PCI: Failed to get U3/U4 HT resources !\n");
return;
}
/* Map external cfg space access into cfg_data and self registers
* into cfg_addr
*/
hose->cfg_data = ioremap(cfg_res.start, 0x02000000);
hose->cfg_addr = ioremap(self_res.start, resource_size(&self_res));
/*
* /ht node doesn't expose a "ranges" property, we read the register
* that controls the decoding logic and use that for memory regions.
* The IO region is hard coded since it is fixed in HW as well.
*/
hose->io_base_phys = 0xf4000000;
hose->pci_io_size = 0x00400000;
hose->io_resource.name = np->full_name;
hose->io_resource.start = 0;
hose->io_resource.end = 0x003fffff;
hose->io_resource.flags = IORESOURCE_IO;
hose->first_busno = 0;
hose->last_busno = 0xef;
/* Note: fix offset when cfg_addr becomes a void * */
decode = in_be32(hose->cfg_addr + 0x80);
DBG("PCI: Apple HT bridge decode register: 0x%08x\n", decode);
/* NOTE: The decode register setup is a bit weird... region
* 0xf8000000 for example is marked as enabled in there while it's
& actually the memory controller registers.
* That means that we are incorrectly attributing it to HT.
*
* In a similar vein, region 0xf4000000 is actually the HT IO space but
* also marked as enabled in here and 0xf9000000 is used by some other
* internal bits of the northbridge.
*
* Unfortunately, we can't just mask out those bit as we would end
* up with more regions than we can cope (linux can only cope with
* 3 memory regions for a PHB at this stage).
*
* So for now, we just do a little hack. We happen to -know- that
* Apple firmware doesn't assign things below 0xfa000000 for that
* bridge anyway so we mask out all bits we don't want.
*/
decode &= 0x003fffff;
/* Now parse the resulting bits and build resources */
parse_region_decode(hose, decode);
}
#endif /* CONFIG_PPC64 */
/*
* 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 int __init pmac_add_bridge(struct device_node *dev)
{
int len;
struct pci_controller *hose;
struct resource rsrc;
char *disp_name;
const int *bus_range;
int primary = 1;
DBG("Adding PCI host bridge %pOF\n", dev);
/* Fetch host bridge registers address */
of_address_to_resource(dev, 0, &rsrc);
/* Get bus range if any */
bus_range = of_get_property(dev, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
" bus 0\n", dev);
}
hose = pcibios_alloc_controller(dev);
if (!hose)
return -ENOMEM;
hose->first_busno = bus_range ? bus_range[0] : 0;
hose->last_busno = bus_range ? bus_range[1] : 0xff;
hose->controller_ops = pmac_pci_controller_ops;
disp_name = NULL;
/* 64 bits only bridges */
#ifdef CONFIG_PPC64
if (of_device_is_compatible(dev, "u3-agp")) {
setup_u3_agp(hose);
disp_name = "U3-AGP";
primary = 0;
} else if (of_device_is_compatible(dev, "u3-ht")) {
setup_u3_ht(hose);
disp_name = "U3-HT";
primary = 1;
} else if (of_device_is_compatible(dev, "u4-pcie")) {
setup_u4_pcie(hose);
disp_name = "U4-PCIE";
primary = 0;
}
printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number:"
" %d->%d\n", disp_name, hose->first_busno, hose->last_busno);
#endif /* CONFIG_PPC64 */
/* 32 bits only bridges */
#ifdef CONFIG_PPC32
if (of_device_is_compatible(dev, "uni-north")) {
primary = setup_uninorth(hose, &rsrc);
disp_name = "UniNorth";
} else if (of_node_name_eq(dev, "pci")) {
/* XXX assume this is a mpc106 (grackle) */
setup_grackle(hose);
disp_name = "Grackle (MPC106)";
} else if (of_node_name_eq(dev, "bandit")) {
setup_bandit(hose, &rsrc);
disp_name = "Bandit";
} else if (of_node_name_eq(dev, "chaos")) {
setup_chaos(hose, &rsrc);
disp_name = "Chaos";
primary = 0;
}
printk(KERN_INFO "Found %s PCI host bridge at 0x%016llx. "
"Firmware bus number: %d->%d\n",
disp_name, (unsigned long long)rsrc.start, hose->first_busno,
hose->last_busno);
#endif /* CONFIG_PPC32 */
DBG(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n",
hose, hose->cfg_addr, hose->cfg_data);
/* 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);
/* create pci_dn's for DT nodes under this PHB */
if (IS_ENABLED(CONFIG_PPC64))
pci_devs_phb_init_dynamic(hose);
return 0;
}
void pmac_pci_irq_fixup(struct pci_dev *dev)
{
#ifdef CONFIG_PPC32
/* Fixup interrupt for the modem/ethernet combo controller.
* on machines with a second ohare chip.
* The number in the device tree (27) is bogus (correct for
* the ethernet-only board but not the combo ethernet/modem
* board). The real interrupt is 28 on the second controller
* -> 28+32 = 60.
*/
if (has_second_ohare &&
dev->vendor == PCI_VENDOR_ID_DEC &&
dev->device == PCI_DEVICE_ID_DEC_TULIP_PLUS) {
dev->irq = irq_create_mapping(NULL, 60);
irq_set_irq_type(dev->irq, IRQ_TYPE_LEVEL_LOW);
}
#endif /* CONFIG_PPC32 */
}
#ifdef CONFIG_PPC64
static int pmac_pci_root_bridge_prepare(struct pci_host_bridge *bridge)
{
struct pci_controller *hose = pci_bus_to_host(bridge->bus);
struct device_node *np, *child;
if (hose != u3_agp)
return 0;
/* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
* assume there is no P2P bridge on the AGP bus, which should be a
* safe assumptions for now. We should do something better in the
* future though
*/
np = hose->dn;
PCI_DN(np)->busno = 0xf0;
for_each_child_of_node(np, child)
PCI_DN(child)->busno = 0xf0;
return 0;
}
#endif /* CONFIG_PPC64 */
void __init pmac_pci_init(void)
{
struct device_node *np, *root;
struct device_node *ht __maybe_unused = NULL;
pci_set_flags(PCI_CAN_SKIP_ISA_ALIGN);
root = of_find_node_by_path("/");
if (root == NULL) {
printk(KERN_CRIT "pmac_pci_init: can't find root "
"of device tree\n");
return;
}
for_each_child_of_node(root, np) {
if (of_node_name_eq(np, "bandit")
|| of_node_name_eq(np, "chaos")
|| of_node_name_eq(np, "pci")) {
if (pmac_add_bridge(np) == 0)
of_node_get(np);
}
if (of_node_name_eq(np, "ht")) {
of_node_get(np);
ht = np;
}
}
of_node_put(root);
#ifdef CONFIG_PPC64
/* Probe HT last as it relies on the agp resources to be already
* setup
*/
if (ht && pmac_add_bridge(ht) != 0)
of_node_put(ht);
ppc_md.pcibios_root_bridge_prepare = pmac_pci_root_bridge_prepare;
/* pmac_check_ht_link(); */
#else /* CONFIG_PPC64 */
init_p2pbridge();
init_second_ohare();
fixup_nec_usb2();
/* We are still having some issues with the Xserve G4, enabling
* some offset between bus number and domains for now when we
* assign all busses should help for now
*/
if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
pcibios_assign_bus_offset = 0x10;
#endif
}
#ifdef CONFIG_PPC32
static bool pmac_pci_enable_device_hook(struct pci_dev *dev)
{
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->class == PCI_CLASS_SERIAL_USB_OHCI
&& !node) {
printk(KERN_INFO "Apple USB OHCI %s disabled by firmware\n",
pci_name(dev));
return false;
}
if (!node)
return true;
uninorth_child = node->parent &&
of_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 && of_node_name_eq(node, "firewire") &&
(of_device_is_compatible(node, "pci106b,18") ||
of_device_is_compatible(node, "pci106b,30") ||
of_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 && of_node_name_eq(node, "ethernet") &&
of_device_is_compatible(node, "gmac")) {
pmac_call_feature(PMAC_FTR_GMAC_ENABLE, node, 0, 1);
updatecfg = 1;
}
/*
* Fixup various header fields on 32 bits. We don't do that on
* 64 bits as some of these have strange values behind the HT
* bridge and we must not, for example, enable MWI or set the
* cache line size on them.
*/
if (updatecfg) {
u16 cmd;
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,
L1_CACHE_BYTES >> 2);
}
return true;
}
static void pmac_pci_fixup_ohci(struct pci_dev *dev)
{
struct device_node *node = pci_device_to_OF_node(dev);
/* We don't want to assign resources to USB controllers
* absent from the OF tree (iBook second controller)
*/
if (dev->class == PCI_CLASS_SERIAL_USB_OHCI && !node)
dev->resource[0].flags = 0;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, PCI_ANY_ID, pmac_pci_fixup_ohci);
/* 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;
for_each_node_by_name(nd, "firewire") {
if (nd->parent && (of_device_is_compatible(nd, "pci106b,18") ||
of_device_is_compatible(nd, "pci106b,30") ||
of_device_is_compatible(nd, "pci11c1,5811"))
&& of_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);
}
}
for_each_node_by_name(nd, "ethernet") {
if (nd->parent && of_device_is_compatible(nd, "gmac")
&& of_device_is_compatible(nd->parent, "uni-north"))
pmac_call_feature(PMAC_FTR_GMAC_ENABLE, nd, 0, 0);
}
}
static void pmac_pci_fixup_cardbus(struct pci_dev *dev)
{
if (!machine_is(powermac))
return;
/*
* Fix the interrupt routing on the various cardbus bridges
* used on powerbooks
*/
if (dev->vendor != PCI_VENDOR_ID_TI)
return;
if (dev->device == PCI_DEVICE_ID_TI_1130 ||
dev->device == PCI_DEVICE_ID_TI_1131) {
u8 val;
/* Enable PCI interrupt */
if (pci_read_config_byte(dev, 0x91, &val) == 0)
pci_write_config_byte(dev, 0x91, val | 0x30);
/* Disable ISA interrupt mode */
if (pci_read_config_byte(dev, 0x92, &val) == 0)
pci_write_config_byte(dev, 0x92, val & ~0x06);
}
if (dev->device == PCI_DEVICE_ID_TI_1210 ||
dev->device == PCI_DEVICE_ID_TI_1211 ||
dev->device == PCI_DEVICE_ID_TI_1410 ||
dev->device == PCI_DEVICE_ID_TI_1510) {
u8 val;
/* 0x8c == TI122X_IRQMUX, 2 says to route the INTA
signal out the MFUNC0 pin */
if (pci_read_config_byte(dev, 0x8c, &val) == 0)
pci_write_config_byte(dev, 0x8c, (val & ~0x0f) | 2);
/* Disable ISA interrupt mode */
if (pci_read_config_byte(dev, 0x92, &val) == 0)
pci_write_config_byte(dev, 0x92, val & ~0x06);
}
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_TI, PCI_ANY_ID, pmac_pci_fixup_cardbus);
static void pmac_pci_fixup_pciata(struct pci_dev *dev)
{
u8 progif = 0;
/*
* On PowerMacs, we try to switch any PCI ATA controller to
* fully native mode
*/
if (!machine_is(powermac))
return;
/* Some controllers don't have the class IDE */
if (dev->vendor == PCI_VENDOR_ID_PROMISE)
switch(dev->device) {
case PCI_DEVICE_ID_PROMISE_20246:
case PCI_DEVICE_ID_PROMISE_20262:
case PCI_DEVICE_ID_PROMISE_20263:
case PCI_DEVICE_ID_PROMISE_20265:
case PCI_DEVICE_ID_PROMISE_20267:
case PCI_DEVICE_ID_PROMISE_20268:
case PCI_DEVICE_ID_PROMISE_20269:
case PCI_DEVICE_ID_PROMISE_20270:
case PCI_DEVICE_ID_PROMISE_20271:
case PCI_DEVICE_ID_PROMISE_20275:
case PCI_DEVICE_ID_PROMISE_20276:
case PCI_DEVICE_ID_PROMISE_20277:
goto good;
}
/* Others, check PCI class */
if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
return;
good:
pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
if ((progif & 5) != 5) {
printk(KERN_INFO "PCI: %s Forcing PCI IDE into native mode\n",
pci_name(dev));
(void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
(progif & 5) != 5)
printk(KERN_ERR "Rewrite of PROGIF failed !\n");
else {
/* Clear IO BARs, they will be reassigned */
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0);
pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0);
pci_write_config_dword(dev, PCI_BASE_ADDRESS_2, 0);
pci_write_config_dword(dev, PCI_BASE_ADDRESS_3, 0);
}
}
}
DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pmac_pci_fixup_pciata);
#endif /* CONFIG_PPC32 */
/*
* Disable second function on K2-SATA, it's broken
* and disable IO BARs on first one
*/
static void fixup_k2_sata(struct pci_dev* dev)
{
int i;
u16 cmd;
if (PCI_FUNC(dev->devfn) > 0) {
pci_read_config_word(dev, PCI_COMMAND, &cmd);
cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
pci_write_config_word(dev, PCI_COMMAND, cmd);
for (i = 0; i < 6; i++) {
dev->resource[i].start = dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i,
0);
}
} else {
pci_read_config_word(dev, PCI_COMMAND, &cmd);
cmd &= ~PCI_COMMAND_IO;
pci_write_config_word(dev, PCI_COMMAND, cmd);
for (i = 0; i < 5; i++) {
dev->resource[i].start = dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i,
0);
}
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SERVERWORKS, 0x0240, fixup_k2_sata);
/*
* On U4 (aka CPC945) the PCIe root complex "P2P" bridge resource ranges aren't
* configured by the firmware. The bridge itself seems to ignore them but it
* causes problems with Linux which then re-assigns devices below the bridge,
* thus changing addresses of those devices from what was in the device-tree,
* which sucks when those are video cards using offb
*
* We could just mark it transparent but I prefer fixing up the resources to
* properly show what's going on here, as I have some doubts about having them
* badly configured potentially being an issue for DMA.
*
* We leave PIO alone, it seems to be fine
*
* Oh and there's another funny bug. The OF properties advertize the region
* 0xf1000000..0xf1ffffff as being forwarded as memory space. But that's
* actually not true, this region is the memory mapped config space. So we
* also need to filter it out or we'll map things in the wrong place.
*/
static void fixup_u4_pcie(struct pci_dev* dev)
{
struct pci_controller *host = pci_bus_to_host(dev->bus);
struct resource *region = NULL;
u32 reg;
int i;
/* Only do that on PowerMac */
if (!machine_is(powermac))
return;
/* Find the largest MMIO region */
for (i = 0; i < 3; i++) {
struct resource *r = &host->mem_resources[i];
if (!(r->flags & IORESOURCE_MEM))
continue;
/* Skip the 0xf0xxxxxx..f2xxxxxx regions, we know they
* are reserved by HW for other things
*/
if (r->start >= 0xf0000000 && r->start < 0xf3000000)
continue;
if (!region || resource_size(r) > resource_size(region))
region = r;
}
/* Nothing found, bail */
if (!region)
return;
/* Print things out */
printk(KERN_INFO "PCI: Fixup U4 PCIe bridge range: %pR\n", region);
/* Fixup bridge config space. We know it's a Mac, resource aren't
* offset so let's just blast them as-is. We also know that they
* fit in 32 bits
*/
reg = ((region->start >> 16) & 0xfff0) | (region->end & 0xfff00000);
pci_write_config_dword(dev, PCI_MEMORY_BASE, reg);
pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0);
pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_U4_PCIE, fixup_u4_pcie);
#ifdef CONFIG_PPC64
static int pmac_pci_probe_mode(struct pci_bus *bus)
{
struct device_node *node = pci_bus_to_OF_node(bus);
/* We need to use normal PCI probing for the AGP bus,
* since the device for the AGP bridge isn't in the tree.
* Same for the PCIe host on U4 and the HT host bridge.
*/
if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
of_device_is_compatible(node, "u4-pcie") ||
of_device_is_compatible(node, "u3-ht")))
return PCI_PROBE_NORMAL;
return PCI_PROBE_DEVTREE;
}
#endif /* CONFIG_PPC64 */
struct pci_controller_ops pmac_pci_controller_ops = {
#ifdef CONFIG_PPC64
.probe_mode = pmac_pci_probe_mode,
#endif
#ifdef CONFIG_PPC32
.enable_device_hook = pmac_pci_enable_device_hook,
#endif
};