352 строки
8.2 KiB
C
352 строки
8.2 KiB
C
/*
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* Copyright (C) 2001 Dave Engebretsen, IBM Corporation
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* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
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*
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* RTAS specific routines for PCI.
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*
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* Based on code from pci.c, chrp_pci.c and pSeries_pci.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/threads.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/irq.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#include <asm/pci-bridge.h>
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#include <asm/iommu.h>
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#include <asm/rtas.h>
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#include <asm/mpic.h>
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#include <asm/ppc-pci.h>
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#include <asm/eeh.h>
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/* RTAS tokens */
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static int read_pci_config;
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static int write_pci_config;
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static int ibm_read_pci_config;
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static int ibm_write_pci_config;
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static inline int config_access_valid(struct pci_dn *dn, int where)
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{
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if (where < 256)
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return 1;
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if (where < 4096 && dn->pci_ext_config_space)
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return 1;
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return 0;
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}
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int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val)
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{
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int returnval = -1;
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unsigned long buid, addr;
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int ret;
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if (!pdn)
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return PCIBIOS_DEVICE_NOT_FOUND;
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if (!config_access_valid(pdn, where))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
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buid = pdn->phb->buid;
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if (buid) {
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ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
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addr, BUID_HI(buid), BUID_LO(buid), size);
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} else {
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ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
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}
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*val = returnval;
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if (ret)
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return PCIBIOS_DEVICE_NOT_FOUND;
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if (returnval == EEH_IO_ERROR_VALUE(size) &&
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eeh_dn_check_failure (pdn->node, NULL))
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return PCIBIOS_DEVICE_NOT_FOUND;
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return PCIBIOS_SUCCESSFUL;
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}
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static int rtas_pci_read_config(struct pci_bus *bus,
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unsigned int devfn,
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int where, int size, u32 *val)
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{
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struct device_node *busdn, *dn;
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if (bus->self)
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busdn = pci_device_to_OF_node(bus->self);
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else
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busdn = bus->sysdata; /* must be a phb */
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/* Search only direct children of the bus */
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for (dn = busdn->child; dn; dn = dn->sibling) {
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struct pci_dn *pdn = PCI_DN(dn);
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if (pdn && pdn->devfn == devfn
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&& of_device_is_available(dn))
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return rtas_read_config(pdn, where, size, val);
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}
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val)
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{
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unsigned long buid, addr;
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int ret;
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if (!pdn)
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return PCIBIOS_DEVICE_NOT_FOUND;
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if (!config_access_valid(pdn, where))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
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buid = pdn->phb->buid;
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if (buid) {
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ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr,
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BUID_HI(buid), BUID_LO(buid), size, (ulong) val);
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} else {
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ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
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}
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if (ret)
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return PCIBIOS_DEVICE_NOT_FOUND;
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return PCIBIOS_SUCCESSFUL;
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}
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static int rtas_pci_write_config(struct pci_bus *bus,
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unsigned int devfn,
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int where, int size, u32 val)
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{
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struct device_node *busdn, *dn;
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if (bus->self)
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busdn = pci_device_to_OF_node(bus->self);
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else
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busdn = bus->sysdata; /* must be a phb */
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/* Search only direct children of the bus */
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for (dn = busdn->child; dn; dn = dn->sibling) {
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struct pci_dn *pdn = PCI_DN(dn);
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if (pdn && pdn->devfn == devfn
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&& of_device_is_available(dn))
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return rtas_write_config(pdn, where, size, val);
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}
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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static struct pci_ops rtas_pci_ops = {
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.read = rtas_pci_read_config,
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.write = rtas_pci_write_config,
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};
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static int is_python(struct device_node *dev)
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{
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const char *model = of_get_property(dev, "model", NULL);
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if (model && strstr(model, "Python"))
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return 1;
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return 0;
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}
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static void python_countermeasures(struct device_node *dev)
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{
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struct resource registers;
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void __iomem *chip_regs;
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volatile u32 val;
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if (of_address_to_resource(dev, 0, ®isters)) {
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printk(KERN_ERR "Can't get address for Python workarounds !\n");
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return;
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}
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/* Python's register file is 1 MB in size. */
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chip_regs = ioremap(registers.start & ~(0xfffffUL), 0x100000);
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/*
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* Firmware doesn't always clear this bit which is critical
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* for good performance - Anton
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*/
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#define PRG_CL_RESET_VALID 0x00010000
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val = in_be32(chip_regs + 0xf6030);
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if (val & PRG_CL_RESET_VALID) {
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printk(KERN_INFO "Python workaround: ");
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val &= ~PRG_CL_RESET_VALID;
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out_be32(chip_regs + 0xf6030, val);
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/*
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* We must read it back for changes to
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* take effect
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*/
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val = in_be32(chip_regs + 0xf6030);
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printk("reg0: %x\n", val);
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}
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iounmap(chip_regs);
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}
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void __init init_pci_config_tokens (void)
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{
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read_pci_config = rtas_token("read-pci-config");
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write_pci_config = rtas_token("write-pci-config");
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ibm_read_pci_config = rtas_token("ibm,read-pci-config");
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ibm_write_pci_config = rtas_token("ibm,write-pci-config");
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}
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unsigned long __devinit get_phb_buid (struct device_node *phb)
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{
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struct resource r;
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if (ibm_read_pci_config == -1)
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return 0;
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if (of_address_to_resource(phb, 0, &r))
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return 0;
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return r.start;
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}
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static int phb_set_bus_ranges(struct device_node *dev,
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struct pci_controller *phb)
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{
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const int *bus_range;
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unsigned int len;
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bus_range = of_get_property(dev, "bus-range", &len);
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if (bus_range == NULL || len < 2 * sizeof(int)) {
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return 1;
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}
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phb->first_busno = bus_range[0];
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phb->last_busno = bus_range[1];
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return 0;
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}
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int __devinit rtas_setup_phb(struct pci_controller *phb)
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{
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struct device_node *dev = phb->dn;
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if (is_python(dev))
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python_countermeasures(dev);
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if (phb_set_bus_ranges(dev, phb))
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return 1;
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phb->ops = &rtas_pci_ops;
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phb->buid = get_phb_buid(dev);
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return 0;
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}
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void __init find_and_init_phbs(void)
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{
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struct device_node *node;
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struct pci_controller *phb;
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struct device_node *root = of_find_node_by_path("/");
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for_each_child_of_node(root, node) {
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if (node->type == NULL || (strcmp(node->type, "pci") != 0 &&
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strcmp(node->type, "pciex") != 0))
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continue;
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phb = pcibios_alloc_controller(node);
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if (!phb)
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continue;
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rtas_setup_phb(phb);
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pci_process_bridge_OF_ranges(phb, node, 0);
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isa_bridge_find_early(phb);
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}
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of_node_put(root);
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pci_devs_phb_init();
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/*
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* pci_probe_only and pci_assign_all_buses can be set via properties
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* in chosen.
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*/
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if (of_chosen) {
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const int *prop;
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prop = of_get_property(of_chosen,
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"linux,pci-probe-only", NULL);
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if (prop)
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pci_probe_only = *prop;
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#ifdef CONFIG_PPC32 /* Will be made generic soon */
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prop = of_get_property(of_chosen,
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"linux,pci-assign-all-buses", NULL);
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if (prop && *prop)
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ppc_pci_flags |= PPC_PCI_REASSIGN_ALL_BUS;
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#endif /* CONFIG_PPC32 */
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}
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}
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/* RPA-specific bits for removing PHBs */
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int pcibios_remove_root_bus(struct pci_controller *phb)
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{
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struct pci_bus *b = phb->bus;
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struct resource *res;
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int rc, i;
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res = b->resource[0];
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if (!res->flags) {
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printk(KERN_ERR "%s: no IO resource for PHB %s\n", __func__,
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b->name);
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return 1;
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}
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rc = pcibios_unmap_io_space(b);
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if (rc) {
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printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
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__func__, b->name);
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return 1;
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}
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if (release_resource(res)) {
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printk(KERN_ERR "%s: failed to release IO on bus %s\n",
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__func__, b->name);
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return 1;
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}
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for (i = 1; i < 3; ++i) {
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res = b->resource[i];
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if (!res->flags && i == 0) {
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printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
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__func__, b->name);
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return 1;
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}
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if (res->flags && release_resource(res)) {
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printk(KERN_ERR
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"%s: failed to release IO %d on bus %s\n",
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__func__, i, b->name);
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return 1;
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}
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}
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pcibios_free_controller(phb);
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return 0;
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}
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EXPORT_SYMBOL(pcibios_remove_root_bus);
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