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