arch/powerpc/platforms/celleb/io-workarounds.c

   1 /*
   2  * Support for Celleb io workarounds
   3  *
   4  * (C) Copyright 2006-2007 TOSHIBA CORPORATION
   5  *
   6  * This file is based to arch/powerpc/platform/cell/io-workarounds.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #undef DEBUG
  24
  25 #include <linux/of_device.h>
  26 #include <linux/irq.h>
  27
  28 #include <asm/io.h>
  29 #include <asm/prom.h>
  30 #include <asm/machdep.h>
  31 #include <asm/pci-bridge.h>
  32 #include <asm/ppc-pci.h>
  33
  34 #include "pci.h"
  35
  36 #define MAX_CELLEB_PCI_BUS      4
  37
  38 void *celleb_dummy_page_va;
  39
  40 static struct celleb_pci_bus {
  41         struct pci_controller *phb;
  42         void (*dummy_read)(struct pci_controller *);
  43 } celleb_pci_busses[MAX_CELLEB_PCI_BUS];
  44
  45 static int celleb_pci_count = 0;
  46
  47 static struct celleb_pci_bus *celleb_pci_find(unsigned long vaddr,
  48                                               unsigned long paddr)
  49 {
  50         int i, j;
  51         struct resource *res;
  52
  53         for (i = 0; i < celleb_pci_count; i++) {
  54                 struct celleb_pci_bus *bus = &celleb_pci_busses[i];
  55                 struct pci_controller *phb = bus->phb;
  56                 if (paddr)
  57                         for (j = 0; j < 3; j++) {
  58                                 res = &phb->mem_resources[j];
  59                                 if (paddr >= res->start && paddr <= res->end)
  60                                         return bus;
  61                         }
  62                 res = &phb->io_resource;
  63                 if (vaddr && vaddr >= res->start && vaddr <= res->end)
  64                         return bus;
  65         }
  66         return NULL;
  67 }
  68
  69 static void celleb_io_flush(const PCI_IO_ADDR addr)
  70 {
  71         struct celleb_pci_bus *bus;
  72         int token;
  73
  74         token = PCI_GET_ADDR_TOKEN(addr);
  75
  76         if (token && token <= celleb_pci_count)
  77                 bus = &celleb_pci_busses[token - 1];
  78         else {
  79                 unsigned long vaddr, paddr;
  80                 pte_t *ptep;
  81
  82                 vaddr = (unsigned long)PCI_FIX_ADDR(addr);
  83                 if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END)
  84                         return;
  85
  86                 ptep = find_linux_pte(init_mm.pgd, vaddr);
  87                 if (ptep == NULL)
  88                         paddr = 0;
  89                 else
  90                         paddr = pte_pfn(*ptep) << PAGE_SHIFT;
  91                 bus = celleb_pci_find(vaddr, paddr);
  92
  93                 if (bus == NULL)
  94                         return;
  95         }
  96
  97         if (bus->dummy_read)
  98                 bus->dummy_read(bus->phb);
  99 }
 100
 101 static u8 celleb_readb(const PCI_IO_ADDR addr)
 102 {
 103         u8 val;
 104         val = __do_readb(addr);
 105         celleb_io_flush(addr);
 106         return val;
 107 }
 108
 109 static u16 celleb_readw(const PCI_IO_ADDR addr)
 110 {
 111         u16 val;
 112         val = __do_readw(addr);
 113         celleb_io_flush(addr);
 114         return val;
 115 }
 116
 117 static u32 celleb_readl(const PCI_IO_ADDR addr)
 118 {
 119         u32 val;
 120         val = __do_readl(addr);
 121         celleb_io_flush(addr);
 122         return val;
 123 }
 124
 125 static u64 celleb_readq(const PCI_IO_ADDR addr)
 126 {
 127         u64 val;
 128         val = __do_readq(addr);
 129         celleb_io_flush(addr);
 130         return val;
 131 }
 132
 133 static u16 celleb_readw_be(const PCI_IO_ADDR addr)
 134 {
 135         u16 val;
 136         val = __do_readw_be(addr);
 137         celleb_io_flush(addr);
 138         return val;
 139 }
 140
 141 static u32 celleb_readl_be(const PCI_IO_ADDR addr)
 142 {
 143         u32 val;
 144         val = __do_readl_be(addr);
 145         celleb_io_flush(addr);
 146         return val;
 147 }
 148
 149 static u64 celleb_readq_be(const PCI_IO_ADDR addr)
 150 {
 151         u64 val;
 152         val = __do_readq_be(addr);
 153         celleb_io_flush(addr);
 154         return val;
 155 }
 156
 157 static void celleb_readsb(const PCI_IO_ADDR addr,
 158                           void *buf, unsigned long count)
 159 {
 160         __do_readsb(addr, buf, count);
 161         celleb_io_flush(addr);
 162 }
 163
 164 static void celleb_readsw(const PCI_IO_ADDR addr,
 165                           void *buf, unsigned long count)
 166 {
 167         __do_readsw(addr, buf, count);
 168         celleb_io_flush(addr);
 169 }
 170
 171 static void celleb_readsl(const PCI_IO_ADDR addr,
 172                           void *buf, unsigned long count)
 173 {
 174         __do_readsl(addr, buf, count);
 175         celleb_io_flush(addr);
 176 }
 177
 178 static void celleb_memcpy_fromio(void *dest,
 179                                  const PCI_IO_ADDR src,
 180                                  unsigned long n)
 181 {
 182         __do_memcpy_fromio(dest, src, n);
 183         celleb_io_flush(src);
 184 }
 185
 186 static void __iomem *celleb_ioremap(unsigned long addr,
 187                                      unsigned long size,
 188                                      unsigned long flags)
 189 {
 190         struct celleb_pci_bus *bus;
 191         void __iomem *res = __ioremap(addr, size, flags);
 192         int busno;
 193
 194         bus = celleb_pci_find(0, addr);
 195         if (bus != NULL) {
 196                 busno = bus - celleb_pci_busses;
 197                 PCI_SET_ADDR_TOKEN(res, busno + 1);
 198         }
 199         return res;
 200 }
 201
 202 static void celleb_iounmap(volatile void __iomem *addr)
 203 {
 204         return __iounmap(PCI_FIX_ADDR(addr));
 205 }
 206
 207 static struct ppc_pci_io celleb_pci_io __initdata = {
 208         .readb = celleb_readb,
 209         .readw = celleb_readw,
 210         .readl = celleb_readl,
 211         .readq = celleb_readq,
 212         .readw_be = celleb_readw_be,
 213         .readl_be = celleb_readl_be,
 214         .readq_be = celleb_readq_be,
 215         .readsb = celleb_readsb,
 216         .readsw = celleb_readsw,
 217         .readsl = celleb_readsl,
 218         .memcpy_fromio = celleb_memcpy_fromio,
 219 };
 220
 221 void __init celleb_pci_add_one(struct pci_controller *phb,
 222                                void (*dummy_read)(struct pci_controller *))
 223 {
 224         struct celleb_pci_bus *bus = &celleb_pci_busses[celleb_pci_count];
 225         struct device_node *np = phb->arch_data;
 226
 227         if (celleb_pci_count >= MAX_CELLEB_PCI_BUS) {
 228                 printk(KERN_ERR "Too many pci bridges, workarounds"
 229                        " disabled for %s\n", np->full_name);
 230                 return;
 231         }
 232
 233         celleb_pci_count++;
 234
 235         bus->phb = phb;
 236         bus->dummy_read = dummy_read;
 237 }
 238
 239 static struct of_device_id celleb_pci_workaround_match[] __initdata = {
 240         {
 241                 .name = "pci-pseudo",
 242                 .data = fake_pci_workaround_init,
 243         }, {
 244                 .name = "epci",
 245                 .data = epci_workaround_init,
 246         }, {
 247         },
 248 };
 249
 250 int __init celleb_pci_workaround_init(void)
 251 {
 252         struct pci_controller *phb;
 253         struct device_node *node;
 254         const struct  of_device_id *match;
 255         void (*init_func)(struct pci_controller *);
 256
 257         celleb_dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL);
 258         if (!celleb_dummy_page_va) {
 259                 printk(KERN_ERR "Celleb: dummy read disabled. "
 260                         "Alloc celleb_dummy_page_va failed\n");
 261                 return 1;
 262         }
 263
 264         list_for_each_entry(phb, &hose_list, list_node) {
 265                 node = phb->arch_data;
 266                 match = of_match_node(celleb_pci_workaround_match, node);
 267
 268                 if (match) {
 269                         init_func = match->data;
 270                         (*init_func)(phb);
 271                 }
 272         }
 273
 274         ppc_pci_io = celleb_pci_io;
 275         ppc_md.ioremap = celleb_ioremap;
 276         ppc_md.iounmap = celleb_iounmap;
 277
 278         return 0;
 279 }