LXR linux/arch/arm/plat-iop/pci.c

   1/*
   2 * arch/arm/plat-iop/pci.c
   3 *
   4 * PCI support for the Intel IOP32X and IOP33X processors
   5 *
   6 * Author: Rory Bolt <rorybolt@pacbell.net>
   7 * Copyright (C) 2002 Rory Bolt
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/pci.h>
  16#include <linux/slab.h>
  17#include <linux/mm.h>
  18#include <linux/init.h>
  19#include <linux/ioport.h>
  20#include <asm/io.h>
  21#include <asm/irq.h>
  22#include <asm/signal.h>
  23#include <asm/system.h>
  24#include <asm/hardware.h>
  25#include <asm/mach/pci.h>
  26#include <asm/hardware/iop3xx.h>
  27
  28// #define DEBUG
  29
  30#ifdef DEBUG
  31#define  DBG(x...) printk(x)
  32#else
  33#define  DBG(x...) do { } while (0)
  34#endif
  35
  36/*
  37 * This routine builds either a type0 or type1 configuration command.  If the
  38 * bus is on the 803xx then a type0 made, else a type1 is created.
  39 */
  40static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where)
  41{
  42        struct pci_sys_data *sys = bus->sysdata;
  43        u32 addr;
  44
  45        if (sys->busnr == bus->number)
  46                addr = 1 << (PCI_SLOT(devfn) + 16) | (PCI_SLOT(devfn) << 11);
  47        else
  48                addr = bus->number << 16 | PCI_SLOT(devfn) << 11 | 1;
  49
  50        addr |= PCI_FUNC(devfn) << 8 | (where & ~3);
  51
  52        return addr;
  53}
  54
  55/*
  56 * This routine checks the status of the last configuration cycle.  If an error
  57 * was detected it returns a 1, else it returns a 0.  The errors being checked
  58 * are parity, master abort, target abort (master and target).  These types of
  59 * errors occur during a config cycle where there is no device, like during
  60 * the discovery stage.
  61 */
  62static int iop3xx_pci_status(void)
  63{
  64        unsigned int status;
  65        int ret = 0;
  66
  67        /*
  68         * Check the status registers.
  69         */
  70        status = *IOP3XX_ATUSR;
  71        if (status & 0xf900) {
  72                DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
  73                *IOP3XX_ATUSR = status & 0xf900;
  74                ret = 1;
  75        }
  76
  77        status = *IOP3XX_ATUISR;
  78        if (status & 0x679f) {
  79                DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
  80                *IOP3XX_ATUISR = status & 0x679f;
  81                ret = 1;
  82        }
  83
  84        return ret;
  85}
  86
  87/*
  88 * Simply write the address register and read the configuration
  89 * data.  Note that the 4 nops ensure that we are able to handle
  90 * a delayed abort (in theory.)
  91 */
  92static u32 iop3xx_read(unsigned long addr)
  93{
  94        u32 val;
  95
  96        __asm__ __volatile__(
  97                "str    %1, [%2]\n\t"
  98                "ldr    %0, [%3]\n\t"
  99                "nop\n\t"
 100                "nop\n\t"
 101                "nop\n\t"
 102                "nop\n\t"
 103                : "=r" (val)
 104                : "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
 105
 106        return val;
 107}
 108
 109/*
 110 * The read routines must check the error status of the last configuration
 111 * cycle.  If there was an error, the routine returns all hex f's.
 112 */
 113static int
 114iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 115                int size, u32 *value)
 116{
 117        unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
 118        u32 val = iop3xx_read(addr) >> ((where & 3) * 8);
 119
 120        if (iop3xx_pci_status())
 121                val = 0xffffffff;
 122
 123        *value = val;
 124
 125        return PCIBIOS_SUCCESSFUL;
 126}
 127
 128static int
 129iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 130                int size, u32 value)
 131{
 132        unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
 133        u32 val;
 134
 135        if (size != 4) {
 136                val = iop3xx_read(addr);
 137                if (iop3xx_pci_status())
 138                        return PCIBIOS_SUCCESSFUL;
 139
 140                where = (where & 3) * 8;
 141
 142                if (size == 1)
 143                        val &= ~(0xff << where);
 144                else
 145                        val &= ~(0xffff << where);
 146
 147                *IOP3XX_OCCDR = val | value << where;
 148        } else {
 149                asm volatile(
 150                        "str    %1, [%2]\n\t"
 151                        "str    %0, [%3]\n\t"
 152                        "nop\n\t"
 153                        "nop\n\t"
 154                        "nop\n\t"
 155                        "nop\n\t"
 156                        :
 157                        : "r" (value), "r" (addr),
 158                          "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
 159        }
 160
 161        return PCIBIOS_SUCCESSFUL;
 162}
 163
 164static struct pci_ops iop3xx_ops = {
 165        .read   = iop3xx_read_config,
 166        .write  = iop3xx_write_config,
 167};
 168
 169/*
 170 * When a PCI device does not exist during config cycles, the 80200 gets a
 171 * bus error instead of returning 0xffffffff. This handler simply returns.
 172 */
 173static int
 174iop3xx_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 175{
 176        DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n",
 177                addr, fsr, regs->ARM_pc, regs->ARM_lr);
 178
 179        /*
 180         * If it was an imprecise abort, then we need to correct the
 181         * return address to be _after_ the instruction.
 182         */
 183        if (fsr & (1 << 10))
 184                regs->ARM_pc += 4;
 185
 186        return 0;
 187}
 188
 189int iop3xx_pci_setup(int nr, struct pci_sys_data *sys)
 190{
 191        struct resource *res;
 192
 193        if (nr != 0)
 194                return 0;
 195
 196        res = kzalloc(2 * sizeof(struct resource), GFP_KERNEL);
 197        if (!res)
 198                panic("PCI: unable to alloc resources");
 199
 200        res[0].start = IOP3XX_PCI_LOWER_IO_PA;
 201        res[0].end   = IOP3XX_PCI_LOWER_IO_PA + IOP3XX_PCI_IO_WINDOW_SIZE - 1;
 202        res[0].name  = "IOP3XX PCI I/O Space";
 203        res[0].flags = IORESOURCE_IO;
 204        request_resource(&ioport_resource, &res[0]);
 205
 206        res[1].start = IOP3XX_PCI_LOWER_MEM_PA;
 207        res[1].end   = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1;
 208        res[1].name  = "IOP3XX PCI Memory Space";
 209        res[1].flags = IORESOURCE_MEM;
 210        request_resource(&iomem_resource, &res[1]);
 211
 212        sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - IOP3XX_PCI_LOWER_MEM_BA;
 213        sys->io_offset  = IOP3XX_PCI_LOWER_IO_PA - IOP3XX_PCI_LOWER_IO_BA;
 214
 215        sys->resource[0] = &res[0];
 216        sys->resource[1] = &res[1];
 217        sys->resource[2] = NULL;
 218
 219        return 1;
 220}
 221
 222struct pci_bus *iop3xx_pci_scan_bus(int nr, struct pci_sys_data *sys)
 223{
 224        return pci_scan_bus(sys->busnr, &iop3xx_ops, sys);
 225}
 226
 227void __init iop3xx_atu_setup(void)
 228{
 229        /* BAR 0 ( Disabled ) */
 230        *IOP3XX_IAUBAR0 = 0x0;
 231        *IOP3XX_IABAR0  = 0x0;
 232        *IOP3XX_IATVR0  = 0x0;
 233        *IOP3XX_IALR0   = 0x0;
 234
 235        /* BAR 1 ( Disabled ) */
 236        *IOP3XX_IAUBAR1 = 0x0;
 237        *IOP3XX_IABAR1  = 0x0;
 238        *IOP3XX_IALR1   = 0x0;
 239
 240        /* BAR 2 (1:1 mapping with Physical RAM) */
 241        /* Set limit and enable */
 242        *IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1;
 243        *IOP3XX_IAUBAR2 = 0x0;
 244
 245        /* Align the inbound bar with the base of memory */
 246        *IOP3XX_IABAR2 = PHYS_OFFSET |
 247                               PCI_BASE_ADDRESS_MEM_TYPE_64 |
 248                               PCI_BASE_ADDRESS_MEM_PREFETCH;
 249
 250        *IOP3XX_IATVR2 = PHYS_OFFSET;
 251
 252        /* Outbound window 0 */
 253        *IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_PA;
 254        *IOP3XX_OUMWTVR0 = 0;
 255
 256        /* Outbound window 1 */
 257        *IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE;
 258        *IOP3XX_OUMWTVR1 = 0;
 259
 260        /* BAR 3 ( Disabled ) */
 261        *IOP3XX_IAUBAR3 = 0x0;
 262        *IOP3XX_IABAR3  = 0x0;
 263        *IOP3XX_IATVR3  = 0x0;
 264        *IOP3XX_IALR3   = 0x0;
 265
 266        /* Setup the I/O Bar
 267         */
 268        *IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_PA;;
 269
 270        /* Enable inbound and outbound cycles
 271         */
 272        *IOP3XX_ATUCMD |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 273                               PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
 274        *IOP3XX_ATUCR |= IOP3XX_ATUCR_OUT_EN;
 275}
 276
 277void __init iop3xx_atu_disable(void)
 278{
 279        *IOP3XX_ATUCMD = 0;
 280        *IOP3XX_ATUCR = 0;
 281
 282        /* wait for cycles to quiesce */
 283        while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY |
 284                                     IOP3XX_PCSR_IN_Q_BUSY))
 285                cpu_relax();
 286
 287        /* BAR 0 ( Disabled ) */
 288        *IOP3XX_IAUBAR0 = 0x0;
 289        *IOP3XX_IABAR0  = 0x0;
 290        *IOP3XX_IATVR0  = 0x0;
 291        *IOP3XX_IALR0   = 0x0;
 292
 293        /* BAR 1 ( Disabled ) */
 294        *IOP3XX_IAUBAR1 = 0x0;
 295        *IOP3XX_IABAR1  = 0x0;
 296        *IOP3XX_IALR1   = 0x0;
 297
 298        /* BAR 2 ( Disabled ) */
 299        *IOP3XX_IAUBAR2 = 0x0;
 300        *IOP3XX_IABAR2  = 0x0;
 301        *IOP3XX_IATVR2  = 0x0;
 302        *IOP3XX_IALR2   = 0x0;
 303
 304        /* BAR 3 ( Disabled ) */
 305        *IOP3XX_IAUBAR3 = 0x0;
 306        *IOP3XX_IABAR3  = 0x0;
 307        *IOP3XX_IATVR3  = 0x0;
 308        *IOP3XX_IALR3   = 0x0;
 309
 310        /* Clear the outbound windows */
 311        *IOP3XX_OIOWTVR  = 0;
 312
 313        /* Outbound window 0 */
 314        *IOP3XX_OMWTVR0 = 0;
 315        *IOP3XX_OUMWTVR0 = 0;
 316
 317        /* Outbound window 1 */
 318        *IOP3XX_OMWTVR1 = 0;
 319        *IOP3XX_OUMWTVR1 = 0;
 320}
 321
 322/* Flag to determine whether the ATU is initialized and the PCI bus scanned */
 323int init_atu;
 324
 325void __init iop3xx_pci_preinit(void)
 326{
 327        if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
 328                iop3xx_atu_disable();
 329                iop3xx_atu_setup();
 330        }
 331
 332        DBG("PCI:  Intel 803xx PCI init code.\n");
 333        DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
 334        DBG("ATU: IOP3XX_OMWTVR0=0x%04x, IOP3XX_OIOWTVR=0x%04x\n",
 335                        *IOP3XX_OMWTVR0,
 336                        *IOP3XX_OIOWTVR);
 337        DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR);
 338        DBG("ATU: IOP3XX_IABAR0=0x%08x IOP3XX_IALR0=0x%08x IOP3XX_IATVR0=%08x\n",
 339                        *IOP3XX_IABAR0, *IOP3XX_IALR0, *IOP3XX_IATVR0);
 340        DBG("ATU: IOP3XX_OMWTVR0=0x%08x\n", *IOP3XX_OMWTVR0);
 341        DBG("ATU: IOP3XX_IABAR1=0x%08x IOP3XX_IALR1=0x%08x\n",
 342                        *IOP3XX_IABAR1, *IOP3XX_IALR1);
 343        DBG("ATU: IOP3XX_ERBAR=0x%08x IOP3XX_ERLR=0x%08x IOP3XX_ERTVR=%08x\n",
 344                        *IOP3XX_ERBAR, *IOP3XX_ERLR, *IOP3XX_ERTVR);
 345        DBG("ATU: IOP3XX_IABAR2=0x%08x IOP3XX_IALR2=0x%08x IOP3XX_IATVR2=%08x\n",
 346                        *IOP3XX_IABAR2, *IOP3XX_IALR2, *IOP3XX_IATVR2);
 347        DBG("ATU: IOP3XX_IABAR3=0x%08x IOP3XX_IALR3=0x%08x IOP3XX_IATVR3=%08x\n",
 348                        *IOP3XX_IABAR3, *IOP3XX_IALR3, *IOP3XX_IATVR3);
 349
 350        hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
 351}
 352
 353/* allow init_atu to be user overridden */
 354static int __init iop3xx_init_atu_setup(char *str)
 355{
 356        init_atu = IOP3XX_INIT_ATU_DEFAULT;
 357        if (str) {
 358                while (*str != '\0') {
 359                        switch (*str) {
 360                        case 'y':
 361                        case 'Y':
 362                                init_atu = IOP3XX_INIT_ATU_ENABLE;
 363                                break;
 364                        case 'n':
 365                        case 'N':
 366                                init_atu = IOP3XX_INIT_ATU_DISABLE;
 367                                break;
 368                        case ',':
 369                        case '=':
 370                                break;
 371                        default:
 372                                printk(KERN_DEBUG "\"%s\" malformed at "
 373                                            "character: \'%c\'",
 374                                            __FUNCTION__,
 375                                            *str);
 376                                *(str + 1) = '\0';
 377                        }
 378                        str++;
 379                }
 380        }
 381
 382        return 1;
 383}
 384
 385__setup("iop3xx_init_atu", iop3xx_init_atu_setup);
 386
 387