arch/parisc/kernel/pci.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1997, 1998 Ralf Baechle
   7  * Copyright (C) 1999 SuSE GmbH
   8  * Copyright (C) 1999-2001 Hewlett-Packard Company
   9  * Copyright (C) 1999-2001 Grant Grundler
  10  */
  11 #include <linux/eisa.h>
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/pci.h>
  16 #include <linux/types.h>
  17
  18 #include <asm/io.h>
  19 #include <asm/superio.h>
  20
  21 #define DEBUG_RESOURCES 0
  22 #define DEBUG_CONFIG 0
  23
  24 #if DEBUG_CONFIG
  25 # define DBGC(x...)     printk(KERN_DEBUG x)
  26 #else
  27 # define DBGC(x...)
  28 #endif
  29
  30
  31 #if DEBUG_RESOURCES
  32 #define DBG_RES(x...)   printk(KERN_DEBUG x)
  33 #else
  34 #define DBG_RES(x...)
  35 #endif
  36
  37 /* To be used as: mdelay(pci_post_reset_delay);
  38  *
  39  * post_reset is the time the kernel should stall to prevent anyone from
  40  * accessing the PCI bus once #RESET is de-asserted.
  41  * PCI spec somewhere says 1 second but with multi-PCI bus systems,
  42  * this makes the boot time much longer than necessary.
  43  * 20ms seems to work for all the HP PCI implementations to date.
  44  *
  45  * #define pci_post_reset_delay 50
  46  */
  47
  48 struct pci_port_ops *pci_port __read_mostly;
  49 struct pci_bios_ops *pci_bios __read_mostly;
  50
  51 static int pci_hba_count __read_mostly;
  52
  53 /* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data.  */
  54 #define PCI_HBA_MAX 32
  55 static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __read_mostly;
  56
  57
  58 /********************************************************************
  59 **
  60 ** I/O port space support
  61 **
  62 *********************************************************************/
  63
  64 /* EISA port numbers and PCI port numbers share the same interface.  Some
  65  * machines have both EISA and PCI adapters installed.  Rather than turn
  66  * pci_port into an array, we reserve bus 0 for EISA and call the EISA
  67  * routines if the access is to a port on bus 0.  We don't want to fix
  68  * EISA and ISA drivers which assume port space is <= 0xffff.
  69  */
  70
  71 #ifdef CONFIG_EISA
  72 #define EISA_IN(size) if (EISA_bus && (b == 0)) return eisa_in##size(addr)
  73 #define EISA_OUT(size) if (EISA_bus && (b == 0)) return eisa_out##size(d, addr)
  74 #else
  75 #define EISA_IN(size)
  76 #define EISA_OUT(size)
  77 #endif
  78
  79 #define PCI_PORT_IN(type, size) \
  80 u##size in##type (int addr) \
  81 { \
  82         int b = PCI_PORT_HBA(addr); \
  83         EISA_IN(size); \
  84         if (!parisc_pci_hba[b]) return (u##size) -1; \
  85         return pci_port->in##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr)); \
  86 } \
  87 EXPORT_SYMBOL(in##type);
  88
  89 PCI_PORT_IN(b,  8)
  90 PCI_PORT_IN(w, 16)
  91 PCI_PORT_IN(l, 32)
  92
  93
  94 #define PCI_PORT_OUT(type, size) \
  95 void out##type (u##size d, int addr) \
  96 { \
  97         int b = PCI_PORT_HBA(addr); \
  98         EISA_OUT(size); \
  99         if (!parisc_pci_hba[b]) return; \
 100         pci_port->out##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr), d); \
 101 } \
 102 EXPORT_SYMBOL(out##type);
 103
 104 PCI_PORT_OUT(b,  8)
 105 PCI_PORT_OUT(w, 16)
 106 PCI_PORT_OUT(l, 32)
 107
 108
 109
 110 /*
 111  * BIOS32 replacement.
 112  */
 113 static int __init pcibios_init(void)
 114 {
 115         if (!pci_bios)
 116                 return -1;
 117
 118         if (pci_bios->init) {
 119                 pci_bios->init();
 120         } else {
 121                 printk(KERN_WARNING "pci_bios != NULL but init() is!\n");
 122         }
 123
 124         /* Set the CLS for PCI as early as possible. */
 125         pci_cache_line_size = pci_dfl_cache_line_size;
 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 /*
 143  * Called by pci_set_master() - a driver interface.
 144  *
 145  * Legacy PDC guarantees to set:
 146  *      Map Memory BAR's into PA IO space.
 147  *      Map Expansion ROM BAR into one common PA IO space per bus.
 148  *      Map IO BAR's into PCI IO space.
 149  *      Command (see below)
 150  *      Cache Line Size
 151  *      Latency Timer
 152  *      Interrupt Line
 153  *      PPB: secondary latency timer, io/mmio base/limit,
 154  *              bus numbers, bridge control
 155  *
 156  */
 157 void pcibios_set_master(struct pci_dev *dev)
 158 {
 159         u8 lat;
 160
 161         /* If someone already mucked with this, don't touch it. */
 162         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
 163         if (lat >= 16) return;
 164
 165         /*
 166         ** HP generally has fewer devices on the bus than other architectures.
 167         ** upper byte is PCI_LATENCY_TIMER.
 168         */
 169         pci_write_config_word(dev, PCI_CACHE_LINE_SIZE,
 170                               (0x80 << 8) | pci_cache_line_size);
 171 }
 172
 173
 174 /*
 175  * pcibios align resources() is called every time generic PCI code
 176  * wants to generate a new address. The process of looking for
 177  * an available address, each candidate is first "aligned" and
 178  * then checked if the resource is available until a match is found.
 179  *
 180  * Since we are just checking candidates, don't use any fields other
 181  * than res->start.
 182  */
 183 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 184                                 resource_size_t size, resource_size_t alignment)
 185 {
 186         resource_size_t mask, align, start = res->start;
 187
 188         DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
 189                 pci_name(((struct pci_dev *) data)),
 190                 res->parent, res->start, res->end,
 191                 (int) res->flags, size, alignment);
 192
 193         /* If it's not IO, then it's gotta be MEM */
 194         align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 195
 196         /* Align to largest of MIN or input size */
 197         mask = max(alignment, align) - 1;
 198         start += mask;
 199         start &= ~mask;
 200
 201         return start;
 202 }
 203
 204
 205 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 206                         enum pci_mmap_state mmap_state, int write_combine)
 207 {
 208         unsigned long prot;
 209
 210         /*
 211          * I/O space can be accessed via normal processor loads and stores on
 212          * this platform but for now we elect not to do this and portable
 213          * drivers should not do this anyway.
 214          */
 215         if (mmap_state == pci_mmap_io)
 216                 return -EINVAL;
 217
 218         if (write_combine)
 219                 return -EINVAL;
 220
 221         /*
 222          * Ignore write-combine; for now only return uncached mappings.
 223          */
 224         prot = pgprot_val(vma->vm_page_prot);
 225         prot |= _PAGE_NO_CACHE;
 226         vma->vm_page_prot = __pgprot(prot);
 227
 228         return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 229                 vma->vm_end - vma->vm_start, vma->vm_page_prot);
 230 }
 231
 232 /*
 233  * A driver is enabling the device.  We make sure that all the appropriate
 234  * bits are set to allow the device to operate as the driver is expecting.
 235  * We enable the port IO and memory IO bits if the device has any BARs of
 236  * that type, and we enable the PERR and SERR bits unconditionally.
 237  * Drivers that do not need parity (eg graphics and possibly networking)
 238  * can clear these bits if they want.
 239  */
 240 int pcibios_enable_device(struct pci_dev *dev, int mask)
 241 {
 242         int err;
 243         u16 cmd, old_cmd;
 244
 245         err = pci_enable_resources(dev, mask);
 246         if (err < 0)
 247                 return err;
 248
 249         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 250         old_cmd = cmd;
 251
 252         cmd |= (PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
 253
 254 #if 0
 255         /* If bridge/bus controller has FBB enabled, child must too. */
 256         if (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_FAST_BACK)
 257                 cmd |= PCI_COMMAND_FAST_BACK;
 258 #endif
 259
 260         if (cmd != old_cmd) {
 261                 dev_info(&dev->dev, "enabling SERR and PARITY (%04x -> %04x)\n",
 262                         old_cmd, cmd);
 263                 pci_write_config_word(dev, PCI_COMMAND, cmd);
 264         }
 265         return 0;
 266 }
 267
 268
 269 /* PA-RISC specific */
 270 void pcibios_register_hba(struct pci_hba_data *hba)
 271 {
 272         if (pci_hba_count >= PCI_HBA_MAX) {
 273                 printk(KERN_ERR "PCI: Too many Host Bus Adapters\n");
 274                 return;
 275         }
 276
 277         parisc_pci_hba[pci_hba_count] = hba;
 278         hba->hba_num = pci_hba_count++;
 279 }
 280
 281 subsys_initcall(pcibios_init);