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io-workarounds.c

/*
 * Support for Celleb io workarounds
 *
 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
 *
 * This file is based to arch/powerpc/platform/cell/io-workarounds.c
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#undef DEBUG

#include <linux/of_device.h>
#include <linux/irq.h>

#include <asm/io.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>

#include "pci.h"

#define MAX_CELLEB_PCI_BUS    4

void *celleb_dummy_page_va;

static struct celleb_pci_bus {
      struct pci_controller *phb;
      void (*dummy_read)(struct pci_controller *);
} celleb_pci_busses[MAX_CELLEB_PCI_BUS];

static int celleb_pci_count = 0;

static struct celleb_pci_bus *celleb_pci_find(unsigned long vaddr,
                                    unsigned long paddr)
{
      int i, j;
      struct resource *res;

      for (i = 0; i < celleb_pci_count; i++) {
            struct celleb_pci_bus *bus = &celleb_pci_busses[i];
            struct pci_controller *phb = bus->phb;
            if (paddr)
                  for (j = 0; j < 3; j++) {
                        res = &phb->mem_resources[j];
                        if (paddr >= res->start && paddr <= res->end)
                              return bus;
                  }
            res = &phb->io_resource;
            if (vaddr && vaddr >= res->start && vaddr <= res->end)
                  return bus;
      }
      return NULL;
}

static void celleb_io_flush(const PCI_IO_ADDR addr)
{
      struct celleb_pci_bus *bus;
      int token;

      token = PCI_GET_ADDR_TOKEN(addr);

      if (token && token <= celleb_pci_count)
            bus = &celleb_pci_busses[token - 1];
      else {
            unsigned long vaddr, paddr;
            pte_t *ptep;

            vaddr = (unsigned long)PCI_FIX_ADDR(addr);
            if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END)
                  return;

            ptep = find_linux_pte(init_mm.pgd, vaddr);
            if (ptep == NULL)
                  paddr = 0;
            else
                  paddr = pte_pfn(*ptep) << PAGE_SHIFT;
            bus = celleb_pci_find(vaddr, paddr);

            if (bus == NULL)
                  return;
      }

      if (bus->dummy_read)
            bus->dummy_read(bus->phb);
}

static u8 celleb_readb(const PCI_IO_ADDR addr)
{
      u8 val;
      val = __do_readb(addr);
      celleb_io_flush(addr);
      return val;
}

static u16 celleb_readw(const PCI_IO_ADDR addr)
{
      u16 val;
      val = __do_readw(addr);
      celleb_io_flush(addr);
      return val;
}

static u32 celleb_readl(const PCI_IO_ADDR addr)
{
      u32 val;
      val = __do_readl(addr);
      celleb_io_flush(addr);
      return val;
}

static u64 celleb_readq(const PCI_IO_ADDR addr)
{
      u64 val;
      val = __do_readq(addr);
      celleb_io_flush(addr);
      return val;
}

static u16 celleb_readw_be(const PCI_IO_ADDR addr)
{
      u16 val;
      val = __do_readw_be(addr);
      celleb_io_flush(addr);
      return val;
}

static u32 celleb_readl_be(const PCI_IO_ADDR addr)
{
      u32 val;
      val = __do_readl_be(addr);
      celleb_io_flush(addr);
      return val;
}

static u64 celleb_readq_be(const PCI_IO_ADDR addr)
{
      u64 val;
      val = __do_readq_be(addr);
      celleb_io_flush(addr);
      return val;
}

static void celleb_readsb(const PCI_IO_ADDR addr,
                    void *buf, unsigned long count)
{
      __do_readsb(addr, buf, count);
      celleb_io_flush(addr);
}

static void celleb_readsw(const PCI_IO_ADDR addr,
                    void *buf, unsigned long count)
{
      __do_readsw(addr, buf, count);
      celleb_io_flush(addr);
}

static void celleb_readsl(const PCI_IO_ADDR addr,
                    void *buf, unsigned long count)
{
      __do_readsl(addr, buf, count);
      celleb_io_flush(addr);
}

static void celleb_memcpy_fromio(void *dest,
                         const PCI_IO_ADDR src,
                         unsigned long n)
{
      __do_memcpy_fromio(dest, src, n);
      celleb_io_flush(src);
}

static void __iomem *celleb_ioremap(unsigned long addr,
                             unsigned long size,
                             unsigned long flags)
{
      struct celleb_pci_bus *bus;
      void __iomem *res = __ioremap(addr, size, flags);
      int busno;

      bus = celleb_pci_find(0, addr);
      if (bus != NULL) {
            busno = bus - celleb_pci_busses;
            PCI_SET_ADDR_TOKEN(res, busno + 1);
      }
      return res;
}

static void celleb_iounmap(volatile void __iomem *addr)
{
      return __iounmap(PCI_FIX_ADDR(addr));
}

static struct ppc_pci_io celleb_pci_io __initdata = {
      .readb = celleb_readb,
      .readw = celleb_readw,
      .readl = celleb_readl,
      .readq = celleb_readq,
      .readw_be = celleb_readw_be,
      .readl_be = celleb_readl_be,
      .readq_be = celleb_readq_be,
      .readsb = celleb_readsb,
      .readsw = celleb_readsw,
      .readsl = celleb_readsl,
      .memcpy_fromio = celleb_memcpy_fromio,
};

void __init celleb_pci_add_one(struct pci_controller *phb,
                         void (*dummy_read)(struct pci_controller *))
{
      struct celleb_pci_bus *bus = &celleb_pci_busses[celleb_pci_count];
      struct device_node *np = phb->arch_data;

      if (celleb_pci_count >= MAX_CELLEB_PCI_BUS) {
            printk(KERN_ERR "Too many pci bridges, workarounds"
                   " disabled for %s\n", np->full_name);
            return;
      }

      celleb_pci_count++;

      bus->phb = phb;
      bus->dummy_read = dummy_read;
}

static struct of_device_id celleb_pci_workaround_match[] __initdata = {
      {
            .name = "pci-pseudo",
            .data = fake_pci_workaround_init,
      }, {
            .name = "epci",
            .data = epci_workaround_init,
      }, {
      },
};

int __init celleb_pci_workaround_init(void)
{
      struct pci_controller *phb;
      struct device_node *node;
      const struct  of_device_id *match;
      void (*init_func)(struct pci_controller *);

      celleb_dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL);
      if (!celleb_dummy_page_va) {
            printk(KERN_ERR "Celleb: dummy read disabled."
                  "Alloc celleb_dummy_page_va failed\n");
            return 1;
      }

      list_for_each_entry(phb, &hose_list, list_node) {
            node = phb->arch_data;
            match = of_match_node(celleb_pci_workaround_match, node);

            if (match) {
                  init_func = match->data;
                  (*init_func)(phb);
            }
      }

      ppc_pci_io = celleb_pci_io;
      ppc_md.ioremap = celleb_ioremap;
      ppc_md.iounmap = celleb_iounmap;

      return 0;
}

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