Ishizaki Kou | da0bd34 | 2007-10-02 18:26:53 +1000 | [diff] [blame] | 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 | |
Grant Likely | 283029d | 2008-01-09 06:20:40 +1100 | [diff] [blame] | 25 | #include <linux/of.h> |
Ishizaki Kou | da0bd34 | 2007-10-02 18:26:53 +1000 | [diff] [blame] | 26 | #include <linux/of_device.h> |
| 27 | #include <linux/irq.h> |
| 28 | |
| 29 | #include <asm/io.h> |
| 30 | #include <asm/prom.h> |
| 31 | #include <asm/machdep.h> |
| 32 | #include <asm/pci-bridge.h> |
| 33 | #include <asm/ppc-pci.h> |
| 34 | |
| 35 | #include "pci.h" |
| 36 | |
| 37 | #define MAX_CELLEB_PCI_BUS 4 |
| 38 | |
| 39 | void *celleb_dummy_page_va; |
| 40 | |
| 41 | static struct celleb_pci_bus { |
| 42 | struct pci_controller *phb; |
| 43 | void (*dummy_read)(struct pci_controller *); |
| 44 | } celleb_pci_busses[MAX_CELLEB_PCI_BUS]; |
| 45 | |
| 46 | static int celleb_pci_count = 0; |
| 47 | |
| 48 | static struct celleb_pci_bus *celleb_pci_find(unsigned long vaddr, |
| 49 | unsigned long paddr) |
| 50 | { |
| 51 | int i, j; |
| 52 | struct resource *res; |
| 53 | |
| 54 | for (i = 0; i < celleb_pci_count; i++) { |
| 55 | struct celleb_pci_bus *bus = &celleb_pci_busses[i]; |
| 56 | struct pci_controller *phb = bus->phb; |
| 57 | if (paddr) |
| 58 | for (j = 0; j < 3; j++) { |
| 59 | res = &phb->mem_resources[j]; |
| 60 | if (paddr >= res->start && paddr <= res->end) |
| 61 | return bus; |
| 62 | } |
| 63 | res = &phb->io_resource; |
| 64 | if (vaddr && vaddr >= res->start && vaddr <= res->end) |
| 65 | return bus; |
| 66 | } |
| 67 | return NULL; |
| 68 | } |
| 69 | |
| 70 | static void celleb_io_flush(const PCI_IO_ADDR addr) |
| 71 | { |
| 72 | struct celleb_pci_bus *bus; |
| 73 | int token; |
| 74 | |
| 75 | token = PCI_GET_ADDR_TOKEN(addr); |
| 76 | |
| 77 | if (token && token <= celleb_pci_count) |
| 78 | bus = &celleb_pci_busses[token - 1]; |
| 79 | else { |
| 80 | unsigned long vaddr, paddr; |
| 81 | pte_t *ptep; |
| 82 | |
| 83 | vaddr = (unsigned long)PCI_FIX_ADDR(addr); |
| 84 | if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END) |
| 85 | return; |
| 86 | |
| 87 | ptep = find_linux_pte(init_mm.pgd, vaddr); |
| 88 | if (ptep == NULL) |
| 89 | paddr = 0; |
| 90 | else |
| 91 | paddr = pte_pfn(*ptep) << PAGE_SHIFT; |
| 92 | bus = celleb_pci_find(vaddr, paddr); |
| 93 | |
| 94 | if (bus == NULL) |
| 95 | return; |
| 96 | } |
| 97 | |
| 98 | if (bus->dummy_read) |
| 99 | bus->dummy_read(bus->phb); |
| 100 | } |
| 101 | |
| 102 | static u8 celleb_readb(const PCI_IO_ADDR addr) |
| 103 | { |
| 104 | u8 val; |
| 105 | val = __do_readb(addr); |
| 106 | celleb_io_flush(addr); |
| 107 | return val; |
| 108 | } |
| 109 | |
| 110 | static u16 celleb_readw(const PCI_IO_ADDR addr) |
| 111 | { |
| 112 | u16 val; |
| 113 | val = __do_readw(addr); |
| 114 | celleb_io_flush(addr); |
| 115 | return val; |
| 116 | } |
| 117 | |
| 118 | static u32 celleb_readl(const PCI_IO_ADDR addr) |
| 119 | { |
| 120 | u32 val; |
| 121 | val = __do_readl(addr); |
| 122 | celleb_io_flush(addr); |
| 123 | return val; |
| 124 | } |
| 125 | |
| 126 | static u64 celleb_readq(const PCI_IO_ADDR addr) |
| 127 | { |
| 128 | u64 val; |
| 129 | val = __do_readq(addr); |
| 130 | celleb_io_flush(addr); |
| 131 | return val; |
| 132 | } |
| 133 | |
| 134 | static u16 celleb_readw_be(const PCI_IO_ADDR addr) |
| 135 | { |
| 136 | u16 val; |
| 137 | val = __do_readw_be(addr); |
| 138 | celleb_io_flush(addr); |
| 139 | return val; |
| 140 | } |
| 141 | |
| 142 | static u32 celleb_readl_be(const PCI_IO_ADDR addr) |
| 143 | { |
| 144 | u32 val; |
| 145 | val = __do_readl_be(addr); |
| 146 | celleb_io_flush(addr); |
| 147 | return val; |
| 148 | } |
| 149 | |
| 150 | static u64 celleb_readq_be(const PCI_IO_ADDR addr) |
| 151 | { |
| 152 | u64 val; |
| 153 | val = __do_readq_be(addr); |
| 154 | celleb_io_flush(addr); |
| 155 | return val; |
| 156 | } |
| 157 | |
| 158 | static void celleb_readsb(const PCI_IO_ADDR addr, |
| 159 | void *buf, unsigned long count) |
| 160 | { |
| 161 | __do_readsb(addr, buf, count); |
| 162 | celleb_io_flush(addr); |
| 163 | } |
| 164 | |
| 165 | static void celleb_readsw(const PCI_IO_ADDR addr, |
| 166 | void *buf, unsigned long count) |
| 167 | { |
| 168 | __do_readsw(addr, buf, count); |
| 169 | celleb_io_flush(addr); |
| 170 | } |
| 171 | |
| 172 | static void celleb_readsl(const PCI_IO_ADDR addr, |
| 173 | void *buf, unsigned long count) |
| 174 | { |
| 175 | __do_readsl(addr, buf, count); |
| 176 | celleb_io_flush(addr); |
| 177 | } |
| 178 | |
| 179 | static void celleb_memcpy_fromio(void *dest, |
| 180 | const PCI_IO_ADDR src, |
| 181 | unsigned long n) |
| 182 | { |
| 183 | __do_memcpy_fromio(dest, src, n); |
| 184 | celleb_io_flush(src); |
| 185 | } |
| 186 | |
| 187 | static void __iomem *celleb_ioremap(unsigned long addr, |
| 188 | unsigned long size, |
| 189 | unsigned long flags) |
| 190 | { |
| 191 | struct celleb_pci_bus *bus; |
| 192 | void __iomem *res = __ioremap(addr, size, flags); |
| 193 | int busno; |
| 194 | |
| 195 | bus = celleb_pci_find(0, addr); |
| 196 | if (bus != NULL) { |
| 197 | busno = bus - celleb_pci_busses; |
| 198 | PCI_SET_ADDR_TOKEN(res, busno + 1); |
| 199 | } |
| 200 | return res; |
| 201 | } |
| 202 | |
| 203 | static void celleb_iounmap(volatile void __iomem *addr) |
| 204 | { |
| 205 | return __iounmap(PCI_FIX_ADDR(addr)); |
| 206 | } |
| 207 | |
| 208 | static struct ppc_pci_io celleb_pci_io __initdata = { |
| 209 | .readb = celleb_readb, |
| 210 | .readw = celleb_readw, |
| 211 | .readl = celleb_readl, |
| 212 | .readq = celleb_readq, |
| 213 | .readw_be = celleb_readw_be, |
| 214 | .readl_be = celleb_readl_be, |
| 215 | .readq_be = celleb_readq_be, |
| 216 | .readsb = celleb_readsb, |
| 217 | .readsw = celleb_readsw, |
| 218 | .readsl = celleb_readsl, |
| 219 | .memcpy_fromio = celleb_memcpy_fromio, |
| 220 | }; |
| 221 | |
| 222 | void __init celleb_pci_add_one(struct pci_controller *phb, |
| 223 | void (*dummy_read)(struct pci_controller *)) |
| 224 | { |
| 225 | struct celleb_pci_bus *bus = &celleb_pci_busses[celleb_pci_count]; |
Stephen Rothwell | 44ef339 | 2007-12-10 14:33:21 +1100 | [diff] [blame] | 226 | struct device_node *np = phb->dn; |
Ishizaki Kou | da0bd34 | 2007-10-02 18:26:53 +1000 | [diff] [blame] | 227 | |
| 228 | if (celleb_pci_count >= MAX_CELLEB_PCI_BUS) { |
| 229 | printk(KERN_ERR "Too many pci bridges, workarounds" |
| 230 | " disabled for %s\n", np->full_name); |
| 231 | return; |
| 232 | } |
| 233 | |
| 234 | celleb_pci_count++; |
| 235 | |
| 236 | bus->phb = phb; |
| 237 | bus->dummy_read = dummy_read; |
| 238 | } |
| 239 | |
| 240 | static struct of_device_id celleb_pci_workaround_match[] __initdata = { |
| 241 | { |
| 242 | .name = "pci-pseudo", |
| 243 | .data = fake_pci_workaround_init, |
| 244 | }, { |
| 245 | .name = "epci", |
| 246 | .data = epci_workaround_init, |
| 247 | }, { |
| 248 | }, |
| 249 | }; |
| 250 | |
| 251 | int __init celleb_pci_workaround_init(void) |
| 252 | { |
| 253 | struct pci_controller *phb; |
| 254 | struct device_node *node; |
| 255 | const struct of_device_id *match; |
| 256 | void (*init_func)(struct pci_controller *); |
| 257 | |
| 258 | celleb_dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 259 | if (!celleb_dummy_page_va) { |
joe@perches.com | df3c901 | 2007-11-20 12:47:55 +1100 | [diff] [blame] | 260 | printk(KERN_ERR "Celleb: dummy read disabled. " |
Ishizaki Kou | da0bd34 | 2007-10-02 18:26:53 +1000 | [diff] [blame] | 261 | "Alloc celleb_dummy_page_va failed\n"); |
| 262 | return 1; |
| 263 | } |
| 264 | |
| 265 | list_for_each_entry(phb, &hose_list, list_node) { |
Stephen Rothwell | 44ef339 | 2007-12-10 14:33:21 +1100 | [diff] [blame] | 266 | node = phb->dn; |
Ishizaki Kou | da0bd34 | 2007-10-02 18:26:53 +1000 | [diff] [blame] | 267 | match = of_match_node(celleb_pci_workaround_match, node); |
| 268 | |
| 269 | if (match) { |
| 270 | init_func = match->data; |
| 271 | (*init_func)(phb); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | ppc_pci_io = celleb_pci_io; |
| 276 | ppc_md.ioremap = celleb_ioremap; |
| 277 | ppc_md.iounmap = celleb_iounmap; |
| 278 | |
| 279 | return 0; |
| 280 | } |