From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/powerpc/platforms/maple/pci.c | 666 +++++++++++++++++++++++++++++++++++++ 1 file changed, 666 insertions(+) create mode 100644 arch/powerpc/platforms/maple/pci.c (limited to 'arch/powerpc/platforms/maple/pci.c') diff --git a/arch/powerpc/platforms/maple/pci.c b/arch/powerpc/platforms/maple/pci.c new file mode 100644 index 000000000..a923230e5 --- /dev/null +++ b/arch/powerpc/platforms/maple/pci.c @@ -0,0 +1,666 @@ +/* + * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), + * IBM Corp. + * + * 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. + */ + +#undef DEBUG + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "maple.h" + +#ifdef DEBUG +#define DBG(x...) printk(x) +#else +#define DBG(x...) +#endif + +static struct pci_controller *u3_agp, *u3_ht, *u4_pcie; + +static int __init fixup_one_level_bus_range(struct device_node *node, int higher) +{ + for (; node != 0;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; + struct property *prop; + int len; + + /* Lookup the "bus-range" property for the hose */ + prop = of_find_property(bridge, "bus-range", &len); + if (prop == NULL || prop->value == NULL || len < 2 * sizeof(int)) { + printk(KERN_WARNING "Can't get bus-range for %s\n", + bridge->full_name); + return; + } + bus_range = prop->value; + bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]); +} + + +static unsigned long u3_agp_cfa0(u8 devfn, u8 off) +{ + return (1 << (unsigned long)PCI_SLOT(devfn)) | + ((unsigned long)PCI_FUNC(devfn) << 8) | + ((unsigned long)off & 0xFCUL); +} + +static unsigned long u3_agp_cfa1(u8 bus, u8 devfn, u8 off) +{ + return ((unsigned long)bus << 16) | + ((unsigned long)devfn << 8) | + ((unsigned long)off & 0xFCUL) | + 1UL; +} + +static volatile void __iomem *u3_agp_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 NULL; + caddr = u3_agp_cfa0(dev_fn, offset); + } else + caddr = u3_agp_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 &= 0x07; + return hose->cfg_data + offset; +} + +static int u3_agp_read_config(struct pci_bus *bus, unsigned int devfn, + int offset, int len, u32 *val) +{ + struct pci_controller *hose; + volatile void __iomem *addr; + + hose = pci_bus_to_host(bus); + if (hose == NULL) + return PCIBIOS_DEVICE_NOT_FOUND; + + addr = u3_agp_cfg_access(hose, bus->number, devfn, offset); + if (!addr) + 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 = in_le16(addr); + break; + default: + *val = in_le32(addr); + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static int u3_agp_write_config(struct pci_bus *bus, unsigned int devfn, + int offset, int len, u32 val) +{ + struct pci_controller *hose; + volatile void __iomem *addr; + + hose = pci_bus_to_host(bus); + if (hose == NULL) + return PCIBIOS_DEVICE_NOT_FOUND; + + addr = u3_agp_cfg_access(hose, bus->number, devfn, offset); + if (!addr) + 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: + out_le16(addr, val); + break; + default: + out_le32(addr, val); + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static struct pci_ops u3_agp_pci_ops = +{ + .read = u3_agp_read_config, + .write = u3_agp_write_config, +}; + +static unsigned long u3_ht_cfa0(u8 devfn, u8 off) +{ + return (devfn << 8) | off; +} + +static unsigned long u3_ht_cfa1(u8 bus, u8 devfn, u8 off) +{ + return u3_ht_cfa0(devfn, off) + (bus << 16) + 0x01000000UL; +} + +static volatile void __iomem *u3_ht_cfg_access(struct pci_controller* hose, + u8 bus, u8 devfn, u8 offset) +{ + if (bus == hose->first_busno) { + if (PCI_SLOT(devfn) == 0) + return NULL; + return hose->cfg_data + u3_ht_cfa0(devfn, offset); + } else + return hose->cfg_data + u3_ht_cfa1(bus, devfn, offset); +} + +static int u3_ht_root_read_config(struct pci_controller *hose, u8 offset, + int len, u32 *val) +{ + volatile void __iomem *addr; + + addr = hose->cfg_addr; + addr += ((offset & ~3) << 2) + (4 - len - (offset & 3)); + + switch (len) { + case 1: + *val = in_8(addr); + break; + case 2: + *val = in_be16(addr); + break; + default: + *val = in_be32(addr); + break; + } + + return PCIBIOS_SUCCESSFUL; +} + +static int u3_ht_root_write_config(struct pci_controller *hose, u8 offset, + int len, u32 val) +{ + volatile void __iomem *addr; + + addr = hose->cfg_addr + ((offset & ~3) << 2) + (4 - len - (offset & 3)); + + if (offset >= PCI_BASE_ADDRESS_0 && offset < PCI_CAPABILITY_LIST) + return PCIBIOS_SUCCESSFUL; + + switch (len) { + case 1: + out_8(addr, val); + break; + case 2: + out_be16(addr, val); + break; + default: + out_be32(addr, val); + break; + } + + return PCIBIOS_SUCCESSFUL; +} + +static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn, + int offset, int len, u32 *val) +{ + struct pci_controller *hose; + volatile void __iomem *addr; + + hose = pci_bus_to_host(bus); + if (hose == NULL) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (bus->number == hose->first_busno && devfn == PCI_DEVFN(0, 0)) + return u3_ht_root_read_config(hose, offset, len, val); + + if (offset > 0xff) + return PCIBIOS_BAD_REGISTER_NUMBER; + + addr = u3_ht_cfg_access(hose, bus->number, devfn, offset); + if (!addr) + 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 = in_le16(addr); + break; + default: + *val = in_le32(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; + volatile void __iomem *addr; + + hose = pci_bus_to_host(bus); + if (hose == NULL) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (bus->number == hose->first_busno && devfn == PCI_DEVFN(0, 0)) + return u3_ht_root_write_config(hose, offset, len, val); + + if (offset > 0xff) + return PCIBIOS_BAD_REGISTER_NUMBER; + + addr = u3_ht_cfg_access(hose, bus->number, devfn, offset); + if (!addr) + 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: + out_le16(addr, val); + break; + default: + out_le32(addr, val); + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static struct pci_ops u3_ht_pci_ops = +{ + .read = u3_ht_read_config, + .write = u3_ht_write_config, +}; + +static unsigned int u4_pcie_cfa0(unsigned int devfn, unsigned int off) +{ + return (1 << PCI_SLOT(devfn)) | + (PCI_FUNC(devfn) << 8) | + ((off >> 8) << 28) | + (off & 0xfcu); +} + +static unsigned int u4_pcie_cfa1(unsigned int bus, unsigned int devfn, + unsigned int off) +{ + return (bus << 16) | + (devfn << 8) | + ((off >> 8) << 28) | + (off & 0xfcu) | 1u; +} + +static volatile void __iomem *u4_pcie_cfg_access(struct pci_controller* hose, + u8 bus, u8 dev_fn, int offset) +{ + unsigned int caddr; + + if (bus == hose->first_busno) + caddr = u4_pcie_cfa0(dev_fn, offset); + else + caddr = u4_pcie_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 &= 0x03; + return hose->cfg_data + offset; +} + +static int u4_pcie_read_config(struct pci_bus *bus, unsigned int devfn, + int offset, int len, u32 *val) +{ + struct pci_controller *hose; + volatile void __iomem *addr; + + hose = pci_bus_to_host(bus); + if (hose == NULL) + return PCIBIOS_DEVICE_NOT_FOUND; + if (offset >= 0x1000) + return PCIBIOS_BAD_REGISTER_NUMBER; + addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset); + if (!addr) + 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 = in_le16(addr); + break; + default: + *val = in_le32(addr); + break; + } + return PCIBIOS_SUCCESSFUL; +} +static int u4_pcie_write_config(struct pci_bus *bus, unsigned int devfn, + int offset, int len, u32 val) +{ + struct pci_controller *hose; + volatile void __iomem *addr; + + hose = pci_bus_to_host(bus); + if (hose == NULL) + return PCIBIOS_DEVICE_NOT_FOUND; + if (offset >= 0x1000) + return PCIBIOS_BAD_REGISTER_NUMBER; + addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset); + if (!addr) + 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: + out_le16(addr, val); + break; + default: + out_le32(addr, val); + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static struct pci_ops u4_pcie_pci_ops = +{ + .read = u4_pcie_read_config, + .write = u4_pcie_write_config, +}; + +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_buses 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; + hose->ops = &u3_agp_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); + + u4_pcie = hose; +} + +static void __init setup_u3_ht(struct pci_controller* hose) +{ + hose->ops = &u3_ht_pci_ops; + + /* 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->cfg_data = ioremap(0xf2000000, 0x02000000); + hose->cfg_addr = ioremap(0xf8070000, 0x1000); + + hose->first_busno = 0; + hose->last_busno = 0xef; + + u3_ht = hose; +} + +static int __init maple_add_bridge(struct device_node *dev) +{ + int len; + struct pci_controller *hose; + char* disp_name; + const int *bus_range; + int primary = 1; + + DBG("Adding PCI host bridge %s\n", dev->full_name); + + 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 %s, assume bus 0\n", + dev->full_name); + } + + hose = pcibios_alloc_controller(dev); + if (hose == NULL) + return -ENOMEM; + hose->first_busno = bus_range ? bus_range[0] : 0; + hose->last_busno = bus_range ? bus_range[1] : 0xff; + hose->controller_ops = maple_pci_controller_ops; + + disp_name = NULL; + 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); + + /* 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); + + /* Check for legacy IOs */ + isa_bridge_find_early(hose); + + return 0; +} + + +void maple_pci_irq_fixup(struct pci_dev *dev) +{ + DBG(" -> maple_pci_irq_fixup\n"); + + /* Fixup IRQ for PCIe host */ + if (u4_pcie != NULL && dev->bus->number == 0 && + pci_bus_to_host(dev->bus) == u4_pcie) { + printk(KERN_DEBUG "Fixup U4 PCIe IRQ\n"); + dev->irq = irq_create_mapping(NULL, 1); + if (dev->irq != NO_IRQ) + irq_set_irq_type(dev->irq, IRQ_TYPE_LEVEL_LOW); + } + + /* Hide AMD8111 IDE interrupt when in legacy mode so + * the driver calls pci_get_legacy_ide_irq() + */ + if (dev->vendor == PCI_VENDOR_ID_AMD && + dev->device == PCI_DEVICE_ID_AMD_8111_IDE && + (dev->class & 5) != 5) { + dev->irq = NO_IRQ; + } + + DBG(" <- maple_pci_irq_fixup\n"); +} + +void __init maple_pci_init(void) +{ + struct device_node *np, *root; + struct device_node *ht = NULL; + + /* Probe root PCI hosts, that is on U3 the AGP host and the + * HyperTransport host. That one is actually "kept" around + * and actually added last as it's resource management relies + * on the AGP resources to have been setup first + */ + root = of_find_node_by_path("/"); + if (root == NULL) { + printk(KERN_CRIT "maple_find_bridges: can't find root of device tree\n"); + return; + } + for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) { + if (!np->type) + continue; + if (strcmp(np->type, "pci") && strcmp(np->type, "ht")) + continue; + if ((of_device_is_compatible(np, "u4-pcie") || + of_device_is_compatible(np, "u3-agp")) && + maple_add_bridge(np) == 0) + of_node_get(np); + + if (of_device_is_compatible(np, "u3-ht")) { + of_node_get(np); + ht = np; + } + } + of_node_put(root); + + /* Now setup the HyperTransport host if we found any + */ + if (ht && maple_add_bridge(ht) != 0) + of_node_put(ht); + + /* Setup the linkage between OF nodes and PHBs */ + pci_devs_phb_init(); + + /* 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 hopefully. + */ + if (u3_agp) { + struct device_node *np = u3_agp->dn; + PCI_DN(np)->busno = 0xf0; + for (np = np->child; np; np = np->sibling) + PCI_DN(np)->busno = 0xf0; + } + + /* Tell pci.c to not change any resource allocations. */ + pci_add_flags(PCI_PROBE_ONLY); +} + +int maple_pci_get_legacy_ide_irq(struct pci_dev *pdev, int channel) +{ + struct device_node *np; + unsigned int defirq = channel ? 15 : 14; + unsigned int irq; + + if (pdev->vendor != PCI_VENDOR_ID_AMD || + pdev->device != PCI_DEVICE_ID_AMD_8111_IDE) + return defirq; + + np = pci_device_to_OF_node(pdev); + if (np == NULL) { + printk("Failed to locate OF node for IDE %s\n", + pci_name(pdev)); + return defirq; + } + irq = irq_of_parse_and_map(np, channel & 0x1); + if (irq == NO_IRQ) { + printk("Failed to map onboard IDE interrupt for channel %d\n", + channel); + return defirq; + } + return irq; +} + +static void quirk_ipr_msi(struct pci_dev *dev) +{ + /* Something prevents MSIs from the IPR from working on Bimini, + * and the driver has no smarts to recover. So disable MSI + * on it for now. */ + + if (machine_is(maple)) { + dev->no_msi = 1; + dev_info(&dev->dev, "Quirk disabled MSI\n"); + } +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_OBSIDIAN, + quirk_ipr_msi); + +struct pci_controller_ops maple_pci_controller_ops = { +}; -- cgit v1.2.3-54-g00ecf