186 lines
4.1 KiB
C
186 lines
4.1 KiB
C
/*
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* Support PCI IO workaround
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*
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* Copyright (C) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>
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* IBM, Corp.
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* (C) Copyright 2007-2008 TOSHIBA CORPORATION
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#include <asm/pgtable.h>
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#include <asm/ppc-pci.h>
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#include "io-workarounds.h"
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#define IOWA_MAX_BUS 8
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static struct iowa_bus iowa_busses[IOWA_MAX_BUS];
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static unsigned int iowa_bus_count;
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static struct iowa_bus *iowa_pci_find(unsigned long vaddr, unsigned long paddr)
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{
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int i, j;
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struct resource *res;
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unsigned long vstart, vend;
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for (i = 0; i < iowa_bus_count; i++) {
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struct iowa_bus *bus = &iowa_busses[i];
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struct pci_controller *phb = bus->phb;
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if (vaddr) {
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vstart = (unsigned long)phb->io_base_virt;
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vend = vstart + phb->pci_io_size - 1;
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if ((vaddr >= vstart) && (vaddr <= vend))
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return bus;
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}
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if (paddr)
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for (j = 0; j < 3; j++) {
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res = &phb->mem_resources[j];
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if (paddr >= res->start && paddr <= res->end)
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return bus;
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}
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}
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return NULL;
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}
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struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr)
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{
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struct iowa_bus *bus;
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int token;
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token = PCI_GET_ADDR_TOKEN(addr);
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if (token && token <= iowa_bus_count)
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bus = &iowa_busses[token - 1];
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else {
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unsigned long vaddr, paddr;
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pte_t *ptep;
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vaddr = (unsigned long)PCI_FIX_ADDR(addr);
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if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END)
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return NULL;
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ptep = find_linux_pte(init_mm.pgd, vaddr);
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if (ptep == NULL)
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paddr = 0;
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else
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paddr = pte_pfn(*ptep) << PAGE_SHIFT;
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bus = iowa_pci_find(vaddr, paddr);
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if (bus == NULL)
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return NULL;
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}
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return bus;
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}
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struct iowa_bus *iowa_pio_find_bus(unsigned long port)
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{
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unsigned long vaddr = (unsigned long)pci_io_base + port;
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return iowa_pci_find(vaddr, 0);
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}
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#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) \
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static ret iowa_##name at \
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{ \
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struct iowa_bus *bus; \
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bus = iowa_##space##_find_bus(aa); \
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if (bus && bus->ops && bus->ops->name) \
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return bus->ops->name al; \
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return __do_##name al; \
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}
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#define DEF_PCI_AC_NORET(name, at, al, space, aa) \
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static void iowa_##name at \
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{ \
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struct iowa_bus *bus; \
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bus = iowa_##space##_find_bus(aa); \
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if (bus && bus->ops && bus->ops->name) { \
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bus->ops->name al; \
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return; \
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} \
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__do_##name al; \
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}
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#include <asm/io-defs.h>
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#undef DEF_PCI_AC_RET
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#undef DEF_PCI_AC_NORET
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static const struct ppc_pci_io __devinitconst iowa_pci_io = {
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#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) .name = iowa_##name,
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#define DEF_PCI_AC_NORET(name, at, al, space, aa) .name = iowa_##name,
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#include <asm/io-defs.h>
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#undef DEF_PCI_AC_RET
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#undef DEF_PCI_AC_NORET
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};
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static void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size,
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unsigned long flags, void *caller)
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{
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struct iowa_bus *bus;
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void __iomem *res = __ioremap_caller(addr, size, flags, caller);
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int busno;
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bus = iowa_pci_find(0, (unsigned long)addr);
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if (bus != NULL) {
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busno = bus - iowa_busses;
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PCI_SET_ADDR_TOKEN(res, busno + 1);
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}
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return res;
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}
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/* Regist new bus to support workaround */
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void __devinit iowa_register_bus(struct pci_controller *phb,
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struct ppc_pci_io *ops,
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int (*initfunc)(struct iowa_bus *, void *), void *data)
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{
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struct iowa_bus *bus;
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struct device_node *np = phb->dn;
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if (iowa_bus_count >= IOWA_MAX_BUS) {
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pr_err("IOWA:Too many pci bridges, "
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"workarounds disabled for %s\n", np->full_name);
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return;
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}
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bus = &iowa_busses[iowa_bus_count];
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bus->phb = phb;
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bus->ops = ops;
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if (initfunc)
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if ((*initfunc)(bus, data))
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return;
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iowa_bus_count++;
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pr_debug("IOWA:[%d]Add bus, %s.\n", iowa_bus_count-1, np->full_name);
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}
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/* enable IO workaround */
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void __devinit io_workaround_init(void)
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{
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static int io_workaround_inited;
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if (io_workaround_inited)
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return;
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ppc_pci_io = iowa_pci_io;
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ppc_md.ioremap = iowa_ioremap;
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io_workaround_inited = 1;
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}
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