diff options
Diffstat (limited to 'arch/powerpc/platforms/powermac/pci.c')
| -rw-r--r-- | arch/powerpc/platforms/powermac/pci.c | 1261 |
1 files changed, 1261 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powermac/pci.c b/arch/powerpc/platforms/powermac/pci.c new file mode 100644 index 000000000..d71359b53 --- /dev/null +++ b/arch/powerpc/platforms/powermac/pci.c @@ -0,0 +1,1261 @@ +// 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 +}; |