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/interrupt.h>
  14 #include <linux/mm.h>
  15 #include <linux/slab.h>
  16 #include <linux/init.h>
  17 #include <linux/ioport.h>
  18 #include <linux/irq.h>
  19 #include <linux/io.h>
  20 #include <linux/spinlock.h>
  21 #include <video/vga.h>
  22
  23 #include <asm/irq.h>
  24 #include <asm/system.h>
  25 #include <asm/mach/pci.h>
  26 #include <asm/hardware/dec21285.h>
  27
  28 #define MAX_SLOTS               21
  29
  30 #define PCICMD_ABORT            ((PCI_STATUS_REC_MASTER_ABORT| \
  31                                   PCI_STATUS_REC_TARGET_ABORT)<<16)
  32
  33 #define PCICMD_ERROR_BITS       ((PCI_STATUS_DETECTED_PARITY | \
  34                                   PCI_STATUS_REC_MASTER_ABORT | \
  35                                   PCI_STATUS_REC_TARGET_ABORT | \
  36                                   PCI_STATUS_PARITY) << 16)
  37
  38 extern int setup_arm_irq(int, struct irqaction *);
  39 extern void pcibios_report_status(u_int status_mask, int warn);
  40
  41 static unsigned long
  42 dc21285_base_address(struct pci_bus *bus, unsigned int devfn)
  43 {
  44         unsigned long addr = 0;
  45
  46         if (bus->number == 0) {
  47                 if (PCI_SLOT(devfn) == 0)
  48                         /*
  49                          * For devfn 0, point at the 21285
  50                          */
  51                         addr = ARMCSR_BASE;
  52                 else {
  53                         devfn -= 1 << 3;
  54
  55                         if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
  56                                 addr = PCICFG0_BASE | 0xc00000 | (devfn << 8);
  57                 }
  58         } else
  59                 addr = PCICFG1_BASE | (bus->number << 16) | (devfn << 8);
  60
  61         return addr;
  62 }
  63
  64 static int
  65 dc21285_read_config(struct pci_bus *bus, unsigned int devfn, int where,
  66                     int size, u32 *value)
  67 {
  68         unsigned long addr = dc21285_base_address(bus, devfn);
  69         u32 v = 0xffffffff;
  70
  71         if (addr)
  72                 switch (size) {
  73                 case 1:
  74                         asm("ldrb       %0, [%1, %2]"
  75                                 : "=r" (v) : "r" (addr), "r" (where) : "cc");
  76                         break;
  77                 case 2:
  78                         asm("ldrh       %0, [%1, %2]"
  79                                 : "=r" (v) : "r" (addr), "r" (where) : "cc");
  80                         break;
  81                 case 4:
  82                         asm("ldr        %0, [%1, %2]"
  83                                 : "=r" (v) : "r" (addr), "r" (where) : "cc");
  84                         break;
  85                 }
  86
  87         *value = v;
  88
  89         v = *CSR_PCICMD;
  90         if (v & PCICMD_ABORT) {
  91                 *CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
  92                 return -1;
  93         }
  94
  95         return PCIBIOS_SUCCESSFUL;
  96 }
  97
  98 static int
  99 dc21285_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 100                      int size, u32 value)
 101 {
 102         unsigned long addr = dc21285_base_address(bus, devfn);
 103         u32 v;
 104
 105         if (addr)
 106                 switch (size) {
 107                 case 1:
 108                         asm("strb       %0, [%1, %2]"
 109                                 : : "r" (value), "r" (addr), "r" (where)
 110                                 : "cc");
 111                         break;
 112                 case 2:
 113                         asm("strh       %0, [%1, %2]"
 114                                 : : "r" (value), "r" (addr), "r" (where)
 115                                 : "cc");
 116                         break;
 117                 case 4:
 118                         asm("str        %0, [%1, %2]"
 119                                 : : "r" (value), "r" (addr), "r" (where)
 120                                 : "cc");
 121                         break;
 122                 }
 123
 124         v = *CSR_PCICMD;
 125         if (v & PCICMD_ABORT) {
 126                 *CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
 127                 return -1;
 128         }
 129
 130         return PCIBIOS_SUCCESSFUL;
 131 }
 132
 133 static struct pci_ops dc21285_ops = {
 134         .read   = dc21285_read_config,
 135         .write  = dc21285_write_config,
 136 };
 137
 138 static struct timer_list serr_timer;
 139 static struct timer_list perr_timer;
 140
 141 static void dc21285_enable_error(unsigned long __data)
 142 {
 143         switch (__data) {
 144         case IRQ_PCI_SERR:
 145                 del_timer(&serr_timer);
 146                 break;
 147
 148         case IRQ_PCI_PERR:
 149                 del_timer(&perr_timer);
 150                 break;
 151         }
 152
 153         enable_irq(__data);
 154 }
 155
 156 /*
 157  * Warn on PCI errors.
 158  */
 159 static irqreturn_t dc21285_abort_irq(int irq, void *dev_id)
 160 {
 161         unsigned int cmd;
 162         unsigned int status;
 163
 164         cmd = *CSR_PCICMD;
 165         status = cmd >> 16;
 166         cmd = cmd & 0xffff;
 167
 168         if (status & PCI_STATUS_REC_MASTER_ABORT) {
 169                 printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n",
 170                         instruction_pointer(get_irq_regs()));
 171                 cmd |= PCI_STATUS_REC_MASTER_ABORT << 16;
 172         }
 173
 174         if (status & PCI_STATUS_REC_TARGET_ABORT) {
 175                 printk(KERN_DEBUG "PCI: target abort: ");
 176                 pcibios_report_status(PCI_STATUS_REC_MASTER_ABORT |
 177                                       PCI_STATUS_SIG_TARGET_ABORT |
 178                                       PCI_STATUS_REC_TARGET_ABORT, 1);
 179                 printk("\n");
 180
 181                 cmd |= PCI_STATUS_REC_TARGET_ABORT << 16;
 182         }
 183
 184         *CSR_PCICMD = cmd;
 185
 186         return IRQ_HANDLED;
 187 }
 188
 189 static irqreturn_t dc21285_serr_irq(int irq, void *dev_id)
 190 {
 191         struct timer_list *timer = dev_id;
 192         unsigned int cntl;
 193
 194         printk(KERN_DEBUG "PCI: system error received: ");
 195         pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1);
 196         printk("\n");
 197
 198         cntl = *CSR_SA110_CNTL & 0xffffdf07;
 199         *CSR_SA110_CNTL = cntl | SA110_CNTL_RXSERR;
 200
 201         /*
 202          * back off this interrupt
 203          */
 204         disable_irq(irq);
 205         timer->expires = jiffies + HZ;
 206         add_timer(timer);
 207
 208         return IRQ_HANDLED;
 209 }
 210
 211 static irqreturn_t dc21285_discard_irq(int irq, void *dev_id)
 212 {
 213         printk(KERN_DEBUG "PCI: discard timer expired\n");
 214         *CSR_SA110_CNTL &= 0xffffde07;
 215
 216         return IRQ_HANDLED;
 217 }
 218
 219 static irqreturn_t dc21285_dparity_irq(int irq, void *dev_id)
 220 {
 221         unsigned int cmd;
 222
 223         printk(KERN_DEBUG "PCI: data parity error detected: ");
 224         pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
 225         printk("\n");
 226
 227         cmd = *CSR_PCICMD & 0xffff;
 228         *CSR_PCICMD = cmd | 1 << 24;
 229
 230         return IRQ_HANDLED;
 231 }
 232
 233 static irqreturn_t dc21285_parity_irq(int irq, void *dev_id)
 234 {
 235         struct timer_list *timer = dev_id;
 236         unsigned int cmd;
 237
 238         printk(KERN_DEBUG "PCI: parity error detected: ");
 239         pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
 240         printk("\n");
 241
 242         cmd = *CSR_PCICMD & 0xffff;
 243         *CSR_PCICMD = cmd | 1 << 31;
 244
 245         /*
 246          * back off this interrupt
 247          */
 248         disable_irq(irq);
 249         timer->expires = jiffies + HZ;
 250         add_timer(timer);
 251
 252         return IRQ_HANDLED;
 253 }
 254
 255 int __init dc21285_setup(int nr, struct pci_sys_data *sys)
 256 {
 257         struct resource *res;
 258
 259         if (nr || !footbridge_cfn_mode())
 260                 return 0;
 261
 262         res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
 263         if (!res) {
 264                 printk("out of memory for root bus resources");
 265                 return 0;
 266         }
 267
 268         res[0].flags = IORESOURCE_MEM;
 269         res[0].name  = "Footbridge non-prefetch";
 270         res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
 271         res[1].name  = "Footbridge prefetch";
 272
 273         allocate_resource(&iomem_resource, &res[1], 0x20000000,
 274                           0xa0000000, 0xffffffff, 0x20000000, NULL, NULL);
 275         allocate_resource(&iomem_resource, &res[0], 0x40000000,
 276                           0x80000000, 0xffffffff, 0x40000000, NULL, NULL);
 277
 278         pci_add_resource(&sys->resources, &ioport_resource);
 279         pci_add_resource(&sys->resources, &res[0]);
 280         pci_add_resource(&sys->resources, &res[1]);
 281         sys->mem_offset  = DC21285_PCI_MEM;
 282
 283         return 1;
 284 }
 285
 286 struct pci_bus * __init dc21285_scan_bus(int nr, struct pci_sys_data *sys)
 287 {
 288         return pci_scan_root_bus(NULL, 0, &dc21285_ops, sys, &sys->resources);
 289 }
 290
 291 #define dc21285_request_irq(_a, _b, _c, _d, _e) \
 292         WARN_ON(request_irq(_a, _b, _c, _d, _e) < 0)
 293
 294 void __init dc21285_preinit(void)
 295 {
 296         unsigned int mem_size, mem_mask;
 297         int cfn_mode;
 298
 299         pcibios_min_mem = 0x81000000;
 300         vga_base = PCIMEM_BASE;
 301
 302         mem_size = (unsigned int)high_memory - PAGE_OFFSET;
 303         for (mem_mask = 0x00100000; mem_mask < 0x10000000; mem_mask <<= 1)
 304                 if (mem_mask >= mem_size)
 305                         break;
 306
 307         /*
 308          * These registers need to be set up whether we're the
 309          * central function or not.
 310          */
 311         *CSR_SDRAMBASEMASK    = (mem_mask - 1) & 0x0ffc0000;
 312         *CSR_SDRAMBASEOFFSET  = 0;
 313         *CSR_ROMBASEMASK      = 0x80000000;
 314         *CSR_CSRBASEMASK      = 0;
 315         *CSR_CSRBASEOFFSET    = 0;
 316         *CSR_PCIADDR_EXTN     = 0;
 317
 318         cfn_mode = __footbridge_cfn_mode();
 319
 320         printk(KERN_INFO "PCI: DC21285 footbridge, revision %02lX, in "
 321                 "%s mode\n", *CSR_CLASSREV & 0xff, cfn_mode ?
 322                 "central function" : "addin");
 323
 324         if (footbridge_cfn_mode()) {
 325                 /*
 326                  * Clear any existing errors - we aren't
 327                  * interested in historical data...
 328                  */
 329                 *CSR_SA110_CNTL = (*CSR_SA110_CNTL & 0xffffde07) |
 330                                   SA110_CNTL_RXSERR;
 331                 *CSR_PCICMD = (*CSR_PCICMD & 0xffff) | PCICMD_ERROR_BITS;
 332         }
 333
 334         init_timer(&serr_timer);
 335         init_timer(&perr_timer);
 336
 337         serr_timer.data = IRQ_PCI_SERR;
 338         serr_timer.function = dc21285_enable_error;
 339         perr_timer.data = IRQ_PCI_PERR;
 340         perr_timer.function = dc21285_enable_error;
 341
 342         /*
 343          * We don't care if these fail.
 344          */
 345         dc21285_request_irq(IRQ_PCI_SERR, dc21285_serr_irq, IRQF_DISABLED,
 346                             "PCI system error", &serr_timer);
 347         dc21285_request_irq(IRQ_PCI_PERR, dc21285_parity_irq, IRQF_DISABLED,
 348                             "PCI parity error", &perr_timer);
 349         dc21285_request_irq(IRQ_PCI_ABORT, dc21285_abort_irq, IRQF_DISABLED,
 350                             "PCI abort", NULL);
 351         dc21285_request_irq(IRQ_DISCARD_TIMER, dc21285_discard_irq, IRQF_DISABLED,
 352                             "Discard timer", NULL);
 353         dc21285_request_irq(IRQ_PCI_DPERR, dc21285_dparity_irq, IRQF_DISABLED,
 354                             "PCI data parity", NULL);
 355
 356         if (cfn_mode) {
 357                 static struct resource csrio;
 358
 359                 csrio.flags  = IORESOURCE_IO;
 360                 csrio.name   = "Footbridge";
 361
 362                 allocate_resource(&ioport_resource, &csrio, 128,
 363                                   0xff00, 0xffff, 128, NULL, NULL);
 364
 365                 /*
 366                  * Map our SDRAM at a known address in PCI space, just in case
 367                  * the firmware had other ideas.  Using a nonzero base is
 368                  * necessary, since some VGA cards forcefully use PCI addresses
 369                  * in the range 0x000a0000 to 0x000c0000. (eg, S3 cards).
 370                  */
 371                 *CSR_PCICSRBASE       = 0xf4000000;
 372                 *CSR_PCICSRIOBASE     = csrio.start;
 373                 *CSR_PCISDRAMBASE     = __virt_to_bus(PAGE_OFFSET);
 374                 *CSR_PCIROMBASE       = 0;
 375                 *CSR_PCICMD = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 376                               PCI_COMMAND_INVALIDATE | PCICMD_ERROR_BITS;
 377         } else if (footbridge_cfn_mode() != 0) {
 378                 /*
 379                  * If we are not compiled to accept "add-in" mode, then
 380                  * we are using a constant virt_to_bus translation which
 381                  * can not hope to cater for the way the host BIOS  has
 382                  * set up the machine.
 383                  */
 384                 panic("PCI: this kernel is compiled for central "
 385                         "function mode only");
 386         }
 387 }
 388
 389 void __init dc21285_postinit(void)
 390 {
 391         register_isa_ports(DC21285_PCI_MEM, DC21285_PCI_IO, 0);
 392 }