arch/arm/mach-footbridge/dc21285.c

   1 /*
   2  *  linux/arch/arm/kernel/dec21285.c: PCI functions for DC21285
   3  *
   4  *  Copyright (C) 1998-2001 Russell King
   5  *  Copyright (C) 1998-2000 Phil Blundell
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/pci.h>
  13 #include <linux/ptrace.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/mm.h>
  16 #include <linux/slab.h>
  17 #include <linux/init.h>
  18 #include <linux/ioport.h>
  19
  20 #include <asm/io.h>
  21 #include <asm/irq.h>
  22 #include <asm/system.h>
  23 #include <asm/mach/pci.h>
  24 #include <asm/hardware/dec21285.h>
  25
  26 #define MAX_SLOTS               21
  27
  28 #define PCICMD_ABORT            ((PCI_STATUS_REC_MASTER_ABORT| \
  29                                   PCI_STATUS_REC_TARGET_ABORT)<<16)
  30
  31 #define PCICMD_ERROR_BITS       ((PCI_STATUS_DETECTED_PARITY | \
  32                                   PCI_STATUS_REC_MASTER_ABORT | \
  33                                   PCI_STATUS_REC_TARGET_ABORT | \
  34                                   PCI_STATUS_PARITY) << 16)
  35
  36 extern int setup_arm_irq(int, struct irqaction *);
  37 extern void pcibios_report_status(u_int status_mask, int warn);
  38 extern void register_isa_ports(unsigned int, unsigned int, unsigned int);
  39
  40 static unsigned long
  41 dc21285_base_address(struct pci_bus *bus, unsigned int devfn)
  42 {
  43         unsigned long addr = 0;
  44
  45         if (bus->number == 0) {
  46                 if (PCI_SLOT(devfn) == 0)
  47                         /*
  48                          * For devfn 0, point at the 21285
  49                          */
  50                         addr = ARMCSR_BASE;
  51                 else {
  52                         devfn -= 1 << 3;
  53
  54                         if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
  55                                 addr = PCICFG0_BASE | 0xc00000 | (devfn << 8);
  56                 }
  57         } else
  58                 addr = PCICFG1_BASE | (bus->number << 16) | (devfn << 8);
  59
  60         return addr;
  61 }
  62
  63 static int
  64 dc21285_read_config(struct pci_bus *bus, unsigned int devfn, int where,
  65                     int size, u32 *value)
  66 {
  67         unsigned long addr = dc21285_base_address(bus, devfn);
  68         u32 v = 0xffffffff;
  69
  70         if (addr)
  71                 switch (size) {
  72                 case 1:
  73                         asm("ldr%?b     %0, [%1, %2]"
  74                                 : "=r" (v) : "r" (addr), "r" (where));
  75                         break;
  76                 case 2:
  77                         asm("ldr%?h     %0, [%1, %2]"
  78                                 : "=r" (v) : "r" (addr), "r" (where));
  79                         break;
  80                 case 4:
  81                         asm("ldr%?      %0, [%1, %2]"
  82                                 : "=r" (v) : "r" (addr), "r" (where));
  83                         break;
  84                 }
  85
  86         *value = v;
  87
  88         v = *CSR_PCICMD;
  89         if (v & PCICMD_ABORT) {
  90                 *CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
  91                 return -1;
  92         }
  93
  94         return PCIBIOS_SUCCESSFUL;
  95 }
  96
  97 static int
  98 dc21285_write_config(struct pci_bus *bus, unsigned int devfn, int where,
  99                      int size, u32 value)
 100 {
 101         unsigned long addr = dc21285_base_address(bus, devfn);
 102         u32 v;
 103
 104         if (addr)
 105                 switch (size) {
 106                 case 1:
 107                         asm("str%?b     %0, [%1, %2]"
 108                                 : : "r" (value), "r" (addr), "r" (where));
 109                         break;
 110                 case 2:
 111                         asm("str%?h     %0, [%1, %2]"
 112                                 : : "r" (value), "r" (addr), "r" (where));
 113                         break;
 114                 case 4:
 115                         asm("str%?      %0, [%1, %2]"
 116                                 : : "r" (value), "r" (addr), "r" (where));
 117                         break;
 118                 }
 119
 120         v = *CSR_PCICMD;
 121         if (v & PCICMD_ABORT) {
 122                 *CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
 123                 return -1;
 124         }
 125
 126         return PCIBIOS_SUCCESSFUL;
 127 }
 128
 129 static struct pci_ops dc21285_ops = {
 130         .read   = dc21285_read_config,
 131         .write  = dc21285_write_config,
 132 };
 133
 134 static struct timer_list serr_timer;
 135 static struct timer_list perr_timer;
 136
 137 static void dc21285_enable_error(unsigned long __data)
 138 {
 139         switch (__data) {
 140         case IRQ_PCI_SERR:
 141                 del_timer(&serr_timer);
 142                 break;
 143
 144         case IRQ_PCI_PERR:
 145                 del_timer(&perr_timer);
 146                 break;
 147         }
 148
 149         enable_irq(__data);
 150 }
 151
 152 /*
 153  * Warn on PCI errors.
 154  */
 155 static irqreturn_t dc21285_abort_irq(int irq, void *dev_id, struct pt_regs *regs)
 156 {
 157         unsigned int cmd;
 158         unsigned int status;
 159
 160         cmd = *CSR_PCICMD;
 161         status = cmd >> 16;
 162         cmd = cmd & 0xffff;
 163
 164         if (status & PCI_STATUS_REC_MASTER_ABORT) {
 165                 printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n",
 166                         instruction_pointer(regs));
 167                 cmd |= PCI_STATUS_REC_MASTER_ABORT << 16;
 168         }
 169
 170         if (status & PCI_STATUS_REC_TARGET_ABORT) {
 171                 printk(KERN_DEBUG "PCI: target abort: ");
 172                 pcibios_report_status(PCI_STATUS_REC_MASTER_ABORT |
 173                                       PCI_STATUS_SIG_TARGET_ABORT |
 174                                       PCI_STATUS_REC_TARGET_ABORT, 1);
 175                 printk("\n");
 176
 177                 cmd |= PCI_STATUS_REC_TARGET_ABORT << 16;
 178         }
 179
 180         *CSR_PCICMD = cmd;
 181
 182         return IRQ_HANDLED;
 183 }
 184
 185 static irqreturn_t dc21285_serr_irq(int irq, void *dev_id, struct pt_regs *regs)
 186 {
 187         struct timer_list *timer = dev_id;
 188         unsigned int cntl;
 189
 190         printk(KERN_DEBUG "PCI: system error received: ");
 191         pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1);
 192         printk("\n");
 193
 194         cntl = *CSR_SA110_CNTL & 0xffffdf07;
 195         *CSR_SA110_CNTL = cntl | SA110_CNTL_RXSERR;
 196
 197         /*
 198          * back off this interrupt
 199          */
 200         disable_irq(irq);
 201         timer->expires = jiffies + HZ;
 202         add_timer(timer);
 203
 204         return IRQ_HANDLED;
 205 }
 206
 207 static irqreturn_t dc21285_discard_irq(int irq, void *dev_id, struct pt_regs *regs)
 208 {
 209         printk(KERN_DEBUG "PCI: discard timer expired\n");
 210         *CSR_SA110_CNTL &= 0xffffde07;
 211
 212         return IRQ_HANDLED;
 213 }
 214
 215 static irqreturn_t dc21285_dparity_irq(int irq, void *dev_id, struct pt_regs *regs)
 216 {
 217         unsigned int cmd;
 218
 219         printk(KERN_DEBUG "PCI: data parity error detected: ");
 220         pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
 221         printk("\n");
 222
 223         cmd = *CSR_PCICMD & 0xffff;
 224         *CSR_PCICMD = cmd | 1 << 24;
 225
 226         return IRQ_HANDLED;
 227 }
 228
 229 static irqreturn_t dc21285_parity_irq(int irq, void *dev_id, struct pt_regs *regs)
 230 {
 231         struct timer_list *timer = dev_id;
 232         unsigned int cmd;
 233
 234         printk(KERN_DEBUG "PCI: parity error detected: ");
 235         pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
 236         printk("\n");
 237
 238         cmd = *CSR_PCICMD & 0xffff;
 239         *CSR_PCICMD = cmd | 1 << 31;
 240
 241         /*
 242          * back off this interrupt
 243          */
 244         disable_irq(irq);
 245         timer->expires = jiffies + HZ;
 246         add_timer(timer);
 247
 248         return IRQ_HANDLED;
 249 }
 250
 251 int __init dc21285_setup(int nr, struct pci_sys_data *sys)
 252 {
 253         struct resource *res;
 254
 255         if (nr || !footbridge_cfn_mode())
 256                 return 0;
 257
 258         res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
 259         if (!res) {
 260                 printk("out of memory for root bus resources");
 261                 return 0;
 262         }
 263
 264         res[0].flags = IORESOURCE_MEM;
 265         res[0].name  = "Footbridge non-prefetch";
 266         res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
 267         res[1].name  = "Footbridge prefetch";
 268
 269         allocate_resource(&iomem_resource, &res[1], 0x20000000,
 270                           0xa0000000, 0xffffffff, 0x20000000, NULL, NULL);
 271         allocate_resource(&iomem_resource, &res[0], 0x40000000,
 272                           0x80000000, 0xffffffff, 0x40000000, NULL, NULL);
 273
 274         sys->resource[0] = &ioport_resource;
 275         sys->resource[1] = &res[0];
 276         sys->resource[2] = &res[1];
 277         sys->mem_offset  = DC21285_PCI_MEM;
 278
 279         return 1;
 280 }
 281
 282 struct pci_bus * __init dc21285_scan_bus(int nr, struct pci_sys_data *sys)
 283 {
 284         return pci_scan_bus(0, &dc21285_ops, sys);
 285 }
 286
 287 void __init dc21285_preinit(void)
 288 {
 289         unsigned int mem_size, mem_mask;
 290         int cfn_mode;
 291
 292         mem_size = (unsigned int)high_memory - PAGE_OFFSET;
 293         for (mem_mask = 0x00100000; mem_mask < 0x10000000; mem_mask <<= 1)
 294                 if (mem_mask >= mem_size)
 295                         break;
 296
 297         /*
 298          * These registers need to be set up whether we're the
 299          * central function or not.
 300          */
 301         *CSR_SDRAMBASEMASK    = (mem_mask - 1) & 0x0ffc0000;
 302         *CSR_SDRAMBASEOFFSET  = 0;
 303         *CSR_ROMBASEMASK      = 0x80000000;
 304         *CSR_CSRBASEMASK      = 0;
 305         *CSR_CSRBASEOFFSET    = 0;
 306         *CSR_PCIADDR_EXTN     = 0;
 307
 308         cfn_mode = __footbridge_cfn_mode();
 309
 310         printk(KERN_INFO "PCI: DC21285 footbridge, revision %02lX, in "
 311                 "%s mode\n", *CSR_CLASSREV & 0xff, cfn_mode ?
 312                 "central function" : "addin");
 313
 314         if (footbridge_cfn_mode()) {
 315                 /*
 316                  * Clear any existing errors - we aren't
 317                  * interested in historical data...
 318                  */
 319                 *CSR_SA110_CNTL = (*CSR_SA110_CNTL & 0xffffde07) |
 320                                   SA110_CNTL_RXSERR;
 321                 *CSR_PCICMD = (*CSR_PCICMD & 0xffff) | PCICMD_ERROR_BITS;
 322         }
 323
 324         init_timer(&serr_timer);
 325         init_timer(&perr_timer);
 326
 327         serr_timer.data = IRQ_PCI_SERR;
 328         serr_timer.function = dc21285_enable_error;
 329         perr_timer.data = IRQ_PCI_PERR;
 330         perr_timer.function = dc21285_enable_error;
 331
 332         /*
 333          * We don't care if these fail.
 334          */
 335         request_irq(IRQ_PCI_SERR, dc21285_serr_irq, SA_INTERRUPT,
 336                     "PCI system error", &serr_timer);
 337         request_irq(IRQ_PCI_PERR, dc21285_parity_irq, SA_INTERRUPT,
 338                     "PCI parity error", &perr_timer);
 339         request_irq(IRQ_PCI_ABORT, dc21285_abort_irq, SA_INTERRUPT,
 340                     "PCI abort", NULL);
 341         request_irq(IRQ_DISCARD_TIMER, dc21285_discard_irq, SA_INTERRUPT,
 342                     "Discard timer", NULL);
 343         request_irq(IRQ_PCI_DPERR, dc21285_dparity_irq, SA_INTERRUPT,
 344                     "PCI data parity", NULL);
 345
 346         if (cfn_mode) {
 347                 static struct resource csrio;
 348
 349                 csrio.flags  = IORESOURCE_IO;
 350                 csrio.name   = "Footbridge";
 351
 352                 allocate_resource(&ioport_resource, &csrio, 128,
 353                                   0xff00, 0xffff, 128, NULL, NULL);
 354
 355                 /*
 356                  * Map our SDRAM at a known address in PCI space, just in case
 357                  * the firmware had other ideas.  Using a nonzero base is
 358                  * necessary, since some VGA cards forcefully use PCI addresses
 359                  * in the range 0x000a0000 to 0x000c0000. (eg, S3 cards).
 360                  */
 361                 *CSR_PCICSRBASE       = 0xf4000000;
 362                 *CSR_PCICSRIOBASE     = csrio.start;
 363                 *CSR_PCISDRAMBASE     = __virt_to_bus(PAGE_OFFSET);
 364                 *CSR_PCIROMBASE       = 0;
 365                 *CSR_PCICMD = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 366                               PCI_COMMAND_INVALIDATE | PCICMD_ERROR_BITS;
 367         } else if (footbridge_cfn_mode() != 0) {
 368                 /*
 369                  * If we are not compiled to accept "add-in" mode, then
 370                  * we are using a constant virt_to_bus translation which
 371                  * can not hope to cater for the way the host BIOS  has
 372                  * set up the machine.
 373                  */
 374                 panic("PCI: this kernel is compiled for central "
 375                         "function mode only");
 376         }
 377 }
 378
 379 void __init dc21285_postinit(void)
 380 {
 381         register_isa_ports(DC21285_PCI_MEM, DC21285_PCI_IO, 0);
 382 }