arch/parisc/kernel/pci.c

   1 /* $Id: pci.c,v 1.6 2000/01/29 00:12:05 grundler Exp $
   2  *
   3  * This file is subject to the terms and conditions of the GNU General Public
   4  * License.  See the file "COPYING" in the main directory of this archive
   5  * for more details.
   6  *
   7  * Copyright (C) 1997, 1998 Ralf Baechle
   8  * Copyright (C) 1999 SuSE GmbH
   9  * Copyright (C) 1999-2001 Hewlett-Packard Company
  10  * Copyright (C) 1999-2001 Grant Grundler
  11  */
  12 #include <linux/eisa.h>
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/pci.h>
  17 #include <linux/slab.h>
  18 #include <linux/types.h>
  19
  20 #include <asm/io.h>
  21 #include <asm/system.h>
  22 #include <asm/cache.h>          /* for L1_CACHE_BYTES */
  23 #include <asm/superio.h>
  24
  25 #define DEBUG_RESOURCES 0
  26 #define DEBUG_CONFIG 0
  27
  28 #if DEBUG_CONFIG
  29 # define DBGC(x...)     printk(KERN_DEBUG x)
  30 #else
  31 # define DBGC(x...)
  32 #endif
  33
  34
  35 #if DEBUG_RESOURCES
  36 #define DBG_RES(x...)   printk(KERN_DEBUG x)
  37 #else
  38 #define DBG_RES(x...)
  39 #endif
  40
  41 /* To be used as: mdelay(pci_post_reset_delay);
  42  *
  43  * post_reset is the time the kernel should stall to prevent anyone from
  44  * accessing the PCI bus once #RESET is de-asserted.
  45  * PCI spec somewhere says 1 second but with multi-PCI bus systems,
  46  * this makes the boot time much longer than necessary.
  47  * 20ms seems to work for all the HP PCI implementations to date.
  48  *
  49  * #define pci_post_reset_delay 50
  50  */
  51
  52 struct pci_port_ops *pci_port __read_mostly;
  53 struct pci_bios_ops *pci_bios __read_mostly;
  54
  55 static int pci_hba_count __read_mostly;
  56
  57 /* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data.  */
  58 #define PCI_HBA_MAX 32
  59 static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __read_mostly;
  60
  61
  62 /********************************************************************
  63 **
  64 ** I/O port space support
  65 **
  66 *********************************************************************/
  67
  68 /* EISA port numbers and PCI port numbers share the same interface.  Some
  69  * machines have both EISA and PCI adapters installed.  Rather than turn
  70  * pci_port into an array, we reserve bus 0 for EISA and call the EISA
  71  * routines if the access is to a port on bus 0.  We don't want to fix
  72  * EISA and ISA drivers which assume port space is <= 0xffff.
  73  */
  74
  75 #ifdef CONFIG_EISA
  76 #define EISA_IN(size) if (EISA_bus && (b == 0)) return eisa_in##size(addr)
  77 #define EISA_OUT(size) if (EISA_bus && (b == 0)) return eisa_out##size(d, addr)
  78 #else
  79 #define EISA_IN(size)
  80 #define EISA_OUT(size)
  81 #endif
  82
  83 #define PCI_PORT_IN(type, size) \
  84 u##size in##type (int addr) \
  85 { \
  86         int b = PCI_PORT_HBA(addr); \
  87         EISA_IN(size); \
  88         if (!parisc_pci_hba[b]) return (u##size) -1; \
  89         return pci_port->in##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr)); \
  90 } \
  91 EXPORT_SYMBOL(in##type);
  92
  93 PCI_PORT_IN(b,  8)
  94 PCI_PORT_IN(w, 16)
  95 PCI_PORT_IN(l, 32)
  96
  97
  98 #define PCI_PORT_OUT(type, size) \
  99 void out##type (u##size d, int addr) \
 100 { \
 101         int b = PCI_PORT_HBA(addr); \
 102         EISA_OUT(size); \
 103         if (!parisc_pci_hba[b]) return; \
 104         pci_port->out##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr), d); \
 105 } \
 106 EXPORT_SYMBOL(out##type);
 107
 108 PCI_PORT_OUT(b,  8)
 109 PCI_PORT_OUT(w, 16)
 110 PCI_PORT_OUT(l, 32)
 111
 112
 113
 114 /*
 115  * BIOS32 replacement.
 116  */
 117 static int __init pcibios_init(void)
 118 {
 119         if (!pci_bios)
 120                 return -1;
 121
 122         if (pci_bios->init) {
 123                 pci_bios->init();
 124         } else {
 125                 printk(KERN_WARNING "pci_bios != NULL but init() is!\n");
 126         }
 127         return 0;
 128 }
 129
 130
 131 /* Called from pci_do_scan_bus() *after* walking a bus but before walking PPBs. */
 132 void pcibios_fixup_bus(struct pci_bus *bus)
 133 {
 134         if (pci_bios->fixup_bus) {
 135                 pci_bios->fixup_bus(bus);
 136         } else {
 137                 printk(KERN_WARNING "pci_bios != NULL but fixup_bus() is!\n");
 138         }
 139 }
 140
 141
 142 char *pcibios_setup(char *str)
 143 {
 144         return str;
 145 }
 146
 147 /*
 148  * Called by pci_set_master() - a driver interface.
 149  *
 150  * Legacy PDC guarantees to set:
 151  *      Map Memory BAR's into PA IO space.
 152  *      Map Expansion ROM BAR into one common PA IO space per bus.
 153  *      Map IO BAR's into PCI IO space.
 154  *      Command (see below)
 155  *      Cache Line Size
 156  *      Latency Timer
 157  *      Interrupt Line
 158  *      PPB: secondary latency timer, io/mmio base/limit,
 159  *              bus numbers, bridge control
 160  *
 161  */
 162 void pcibios_set_master(struct pci_dev *dev)
 163 {
 164         u8 lat;
 165
 166         /* If someone already mucked with this, don't touch it. */
 167         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
 168         if (lat >= 16) return;
 169
 170         /*
 171         ** HP generally has fewer devices on the bus than other architectures.
 172         ** upper byte is PCI_LATENCY_TIMER.
 173         */
 174         pci_write_config_word(dev, PCI_CACHE_LINE_SIZE,
 175                                 (0x80 << 8) | (L1_CACHE_BYTES / sizeof(u32)));
 176 }
 177
 178
 179 void __init pcibios_init_bus(struct pci_bus *bus)
 180 {
 181         struct pci_dev *dev = bus->self;
 182         unsigned short bridge_ctl;
 183
 184         /* We deal only with pci controllers and pci-pci bridges. */
 185         if (!dev || (dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
 186                 return;
 187
 188         /* PCI-PCI bridge - set the cache line and default latency
 189            (32) for primary and secondary buses. */
 190         pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 32);
 191
 192         pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bridge_ctl);
 193         bridge_ctl |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
 194         pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bridge_ctl);
 195 }
 196
 197 /* called by drivers/pci/setup-bus.c:pci_setup_bridge().  */
 198 void __devinit pcibios_resource_to_bus(struct pci_dev *dev,
 199                 struct pci_bus_region *region, struct resource *res)
 200 {
 201 #ifdef CONFIG_64BIT
 202         struct pci_hba_data *hba = HBA_DATA(dev->bus->bridge->platform_data);
 203 #endif
 204
 205         if (res->flags & IORESOURCE_IO) {
 206                 /*
 207                 ** I/O space may see busnumbers here. Something
 208                 ** in the form of 0xbbxxxx where bb is the bus num
 209                 ** and xxxx is the I/O port space address.
 210                 ** Remaining address translation are done in the
 211                 ** PCI Host adapter specific code - ie dino_out8.
 212                 */
 213                 region->start = PCI_PORT_ADDR(res->start);
 214                 region->end   = PCI_PORT_ADDR(res->end);
 215         } else if (res->flags & IORESOURCE_MEM) {
 216                 /* Convert MMIO addr to PCI addr (undo global virtualization) */
 217                 region->start = PCI_BUS_ADDR(hba, res->start);
 218                 region->end   = PCI_BUS_ADDR(hba, res->end);
 219         }
 220
 221         DBG_RES("pcibios_resource_to_bus(%02x %s [%lx,%lx])\n",
 222                 dev->bus->number, res->flags & IORESOURCE_IO ? "IO" : "MEM",
 223                 region->start, region->end);
 224 }
 225
 226 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
 227                               struct pci_bus_region *region)
 228 {
 229 #ifdef CONFIG_64BIT
 230         struct pci_hba_data *hba = HBA_DATA(dev->bus->bridge->platform_data);
 231 #endif
 232
 233         if (res->flags & IORESOURCE_MEM) {
 234                 res->start = PCI_HOST_ADDR(hba, region->start);
 235                 res->end = PCI_HOST_ADDR(hba, region->end);
 236         }
 237
 238         if (res->flags & IORESOURCE_IO) {
 239                 res->start = region->start;
 240                 res->end = region->end;
 241         }
 242 }
 243
 244 #ifdef CONFIG_HOTPLUG
 245 EXPORT_SYMBOL(pcibios_resource_to_bus);
 246 EXPORT_SYMBOL(pcibios_bus_to_resource);
 247 #endif
 248
 249 /*
 250  * pcibios align resources() is called every time generic PCI code
 251  * wants to generate a new address. The process of looking for
 252  * an available address, each candidate is first "aligned" and
 253  * then checked if the resource is available until a match is found.
 254  *
 255  * Since we are just checking candidates, don't use any fields other
 256  * than res->start.
 257  */
 258 void pcibios_align_resource(void *data, struct resource *res,
 259                                 resource_size_t size, resource_size_t alignment)
 260 {
 261         resource_size_t mask, align;
 262
 263         DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
 264                 pci_name(((struct pci_dev *) data)),
 265                 res->parent, res->start, res->end,
 266                 (int) res->flags, size, alignment);
 267
 268         /* If it's not IO, then it's gotta be MEM */
 269         align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 270
 271         /* Align to largest of MIN or input size */
 272         mask = max(alignment, align) - 1;
 273         res->start += mask;
 274         res->start &= ~mask;
 275
 276         /* The caller updates the end field, we don't.  */
 277 }
 278
 279
 280 /*
 281  * A driver is enabling the device.  We make sure that all the appropriate
 282  * bits are set to allow the device to operate as the driver is expecting.
 283  * We enable the port IO and memory IO bits if the device has any BARs of
 284  * that type, and we enable the PERR and SERR bits unconditionally.
 285  * Drivers that do not need parity (eg graphics and possibly networking)
 286  * can clear these bits if they want.
 287  */
 288 int pcibios_enable_device(struct pci_dev *dev, int mask)
 289 {
 290         int err;
 291         u16 cmd, old_cmd;
 292
 293         err = pci_enable_resources(dev, mask);
 294         if (err < 0)
 295                 return err;
 296
 297         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 298         old_cmd = cmd;
 299
 300         cmd |= (PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
 301
 302 #if 0
 303         /* If bridge/bus controller has FBB enabled, child must too. */
 304         if (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_FAST_BACK)
 305                 cmd |= PCI_COMMAND_FAST_BACK;
 306 #endif
 307
 308         if (cmd != old_cmd) {
 309                 dev_info(&dev->dev, "enabling SERR and PARITY (%04x -> %04x)\n",
 310                         old_cmd, cmd);
 311                 pci_write_config_word(dev, PCI_COMMAND, cmd);
 312         }
 313         return 0;
 314 }
 315
 316
 317 /* PA-RISC specific */
 318 void pcibios_register_hba(struct pci_hba_data *hba)
 319 {
 320         if (pci_hba_count >= PCI_HBA_MAX) {
 321                 printk(KERN_ERR "PCI: Too many Host Bus Adapters\n");
 322                 return;
 323         }
 324
 325         parisc_pci_hba[pci_hba_count] = hba;
 326         hba->hba_num = pci_hba_count++;
 327 }
 328
 329 subsys_initcall(pcibios_init);