arch/alpha/kernel/core_irongate.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      linux/arch/alpha/kernel/core_irongate.c
   4  *
   5  * Based on code written by David A. Rusling (david.rusling@reo.mts.dec.com).
   6  *
   7  *      Copyright (C) 1999 Alpha Processor, Inc.,
   8  *              (David Daniel, Stig Telfer, Soohoon Lee)
   9  *
  10  * Code common to all IRONGATE core logic chips.
  11  */
  12
  13 #define __EXTERN_INLINE inline
  14 #include <asm/io.h>
  15 #include <asm/core_irongate.h>
  16 #undef __EXTERN_INLINE
  17
  18 #include <linux/types.h>
  19 #include <linux/pci.h>
  20 #include <linux/sched.h>
  21 #include <linux/init.h>
  22 #include <linux/initrd.h>
  23 #include <linux/bootmem.h>
  24
  25 #include <asm/ptrace.h>
  26 #include <asm/cacheflush.h>
  27 #include <asm/tlbflush.h>
  28
  29 #include "proto.h"
  30 #include "pci_impl.h"
  31
  32 /*
  33  * BIOS32-style PCI interface:
  34  */
  35
  36 #define DEBUG_CONFIG 0
  37
  38 #if DEBUG_CONFIG
  39 # define DBG_CFG(args)  printk args
  40 #else
  41 # define DBG_CFG(args)
  42 #endif
  43
  44 igcsr32 *IronECC;
  45
  46 /*
  47  * Given a bus, device, and function number, compute resulting
  48  * configuration space address accordingly.  It is therefore not safe
  49  * to have concurrent invocations to configuration space access
  50  * routines, but there really shouldn't be any need for this.
  51  *
  52  *      addr[31:24]             reserved
  53  *      addr[23:16]             bus number (8 bits = 128 possible buses)
  54  *      addr[15:11]             Device number (5 bits)
  55  *      addr[10: 8]             function number
  56  *      addr[ 7: 2]             register number
  57  *
  58  * For IRONGATE:
  59  *    if (bus = addr[23:16]) == 0
  60  *    then
  61  *        type 0 config cycle:
  62  *            addr_on_pci[31:11] = id selection for device = addr[15:11]
  63  *            addr_on_pci[10: 2] = addr[10: 2] ???
  64  *            addr_on_pci[ 1: 0] = 00
  65  *    else
  66  *        type 1 config cycle (pass on with no decoding):
  67  *            addr_on_pci[31:24] = 0
  68  *            addr_on_pci[23: 2] = addr[23: 2]
  69  *            addr_on_pci[ 1: 0] = 01
  70  *    fi
  71  *
  72  * Notes:
  73  *      The function number selects which function of a multi-function device
  74  *      (e.g., SCSI and Ethernet).
  75  *
  76  *      The register selects a DWORD (32 bit) register offset.  Hence it
  77  *      doesn't get shifted by 2 bits as we want to "drop" the bottom two
  78  *      bits.
  79  */
  80
  81 static int
  82 mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
  83              unsigned long *pci_addr, unsigned char *type1)
  84 {
  85         unsigned long addr;
  86         u8 bus = pbus->number;
  87
  88         DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, "
  89                  "pci_addr=0x%p, type1=0x%p)\n",
  90                  bus, device_fn, where, pci_addr, type1));
  91
  92         *type1 = (bus != 0);
  93
  94         addr = (bus << 16) | (device_fn << 8) | where;
  95         addr |= IRONGATE_CONF;
  96
  97         *pci_addr = addr;
  98         DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
  99         return 0;
 100 }
 101
 102 static int
 103 irongate_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 104                      int size, u32 *value)
 105 {
 106         unsigned long addr;
 107         unsigned char type1;
 108
 109         if (mk_conf_addr(bus, devfn, where, &addr, &type1))
 110                 return PCIBIOS_DEVICE_NOT_FOUND;
 111
 112         switch (size) {
 113         case 1:
 114                 *value = __kernel_ldbu(*(vucp)addr);
 115                 break;
 116         case 2:
 117                 *value = __kernel_ldwu(*(vusp)addr);
 118                 break;
 119         case 4:
 120                 *value = *(vuip)addr;
 121                 break;
 122         }
 123
 124         return PCIBIOS_SUCCESSFUL;
 125 }
 126
 127 static int
 128 irongate_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 129                       int size, u32 value)
 130 {
 131         unsigned long addr;
 132         unsigned char type1;
 133
 134         if (mk_conf_addr(bus, devfn, where, &addr, &type1))
 135                 return PCIBIOS_DEVICE_NOT_FOUND;
 136
 137         switch (size) {
 138         case 1:
 139                 __kernel_stb(value, *(vucp)addr);
 140                 mb();
 141                 __kernel_ldbu(*(vucp)addr);
 142                 break;
 143         case 2:
 144                 __kernel_stw(value, *(vusp)addr);
 145                 mb();
 146                 __kernel_ldwu(*(vusp)addr);
 147                 break;
 148         case 4:
 149                 *(vuip)addr = value;
 150                 mb();
 151                 *(vuip)addr;
 152                 break;
 153         }
 154
 155         return PCIBIOS_SUCCESSFUL;
 156 }
 157
 158 struct pci_ops irongate_pci_ops =
 159 {
 160         .read =         irongate_read_config,
 161         .write =        irongate_write_config,
 162 };
 163 \f
 164 int
 165 irongate_pci_clr_err(void)
 166 {
 167         unsigned int nmi_ctl=0;
 168         unsigned int IRONGATE_jd;
 169
 170 again:
 171         IRONGATE_jd = IRONGATE0->stat_cmd;
 172         printk("Iron stat_cmd %x\n", IRONGATE_jd);
 173         IRONGATE0->stat_cmd = IRONGATE_jd; /* write again clears error bits */
 174         mb();
 175         IRONGATE_jd = IRONGATE0->stat_cmd;  /* re-read to force write */
 176
 177         IRONGATE_jd = *IronECC;
 178         printk("Iron ECC %x\n", IRONGATE_jd);
 179         *IronECC = IRONGATE_jd; /* write again clears error bits */
 180         mb();
 181         IRONGATE_jd = *IronECC;  /* re-read to force write */
 182
 183         /* Clear ALI NMI */
 184         nmi_ctl = inb(0x61);
 185         nmi_ctl |= 0x0c;
 186         outb(nmi_ctl, 0x61);
 187         nmi_ctl &= ~0x0c;
 188         outb(nmi_ctl, 0x61);
 189
 190         IRONGATE_jd = *IronECC;
 191         if (IRONGATE_jd & 0x300) goto again;
 192
 193         return 0;
 194 }
 195
 196 #define IRONGATE_3GB 0xc0000000UL
 197
 198 /* On Albacore (aka UP1500) with 4Gb of RAM we have to reserve some
 199    memory for PCI. At this point we just reserve memory above 3Gb. Most
 200    of this memory will be freed after PCI setup is done. */
 201 static void __init
 202 albacore_init_arch(void)
 203 {
 204         unsigned long memtop = max_low_pfn << PAGE_SHIFT;
 205         unsigned long pci_mem = (memtop + 0x1000000UL) & ~0xffffffUL;
 206         struct percpu_struct *cpu;
 207         int pal_rev, pal_var;
 208
 209         cpu = (struct percpu_struct*)((char*)hwrpb + hwrpb->processor_offset);
 210         pal_rev = cpu->pal_revision & 0xffff;
 211         pal_var = (cpu->pal_revision >> 16) & 0xff;
 212
 213         /* Consoles earlier than A5.6-18 (OSF PALcode v1.62-2) set up
 214            the CPU incorrectly (leave speculative stores enabled),
 215            which causes memory corruption under certain conditions.
 216            Issue a warning for such consoles. */
 217         if (alpha_using_srm &&
 218             (pal_rev < 0x13e || (pal_rev == 0x13e && pal_var < 2)))
 219                 printk(KERN_WARNING "WARNING! Upgrade to SRM A5.6-19 "
 220                                     "or later\n");
 221
 222         if (pci_mem > IRONGATE_3GB)
 223                 pci_mem = IRONGATE_3GB;
 224         IRONGATE0->pci_mem = pci_mem;
 225         alpha_mv.min_mem_address = pci_mem;
 226         if (memtop > pci_mem) {
 227 #ifdef CONFIG_BLK_DEV_INITRD
 228                 extern unsigned long initrd_start, initrd_end;
 229                 extern void *move_initrd(unsigned long);
 230
 231                 /* Move the initrd out of the way. */
 232                 if (initrd_end && __pa(initrd_end) > pci_mem) {
 233                         unsigned long size;
 234
 235                         size = initrd_end - initrd_start;
 236                         free_bootmem_node(NODE_DATA(0), __pa(initrd_start),
 237                                           PAGE_ALIGN(size));
 238                         if (!move_initrd(pci_mem))
 239                                 printk("irongate_init_arch: initrd too big "
 240                                        "(%ldK)\ndisabling initrd\n",
 241                                        size / 1024);
 242                 }
 243 #endif
 244                 reserve_bootmem_node(NODE_DATA(0), pci_mem, memtop -
 245                                 pci_mem, BOOTMEM_DEFAULT);
 246                 printk("irongate_init_arch: temporarily reserving "
 247                         "region %08lx-%08lx for PCI\n", pci_mem, memtop - 1);
 248         }
 249 }
 250
 251 static void __init
 252 irongate_setup_agp(void)
 253 {
 254         /* Disable the GART window. AGPGART doesn't work due to yet
 255            unresolved memory coherency issues... */
 256         IRONGATE0->agpva = IRONGATE0->agpva & ~0xf;
 257         alpha_agpgart_size = 0;
 258 }
 259
 260 void __init
 261 irongate_init_arch(void)
 262 {
 263         struct pci_controller *hose;
 264         int amd761 = (IRONGATE0->dev_vendor >> 16) > 0x7006;    /* Albacore? */
 265
 266         IronECC = amd761 ? &IRONGATE0->bacsr54_eccms761 : &IRONGATE0->dramms;
 267
 268         irongate_pci_clr_err();
 269
 270         if (amd761)
 271                 albacore_init_arch();
 272
 273         irongate_setup_agp();
 274
 275         /*
 276          * Create our single hose.
 277          */
 278
 279         pci_isa_hose = hose = alloc_pci_controller();
 280         hose->io_space = &ioport_resource;
 281         hose->mem_space = &iomem_resource;
 282         hose->index = 0;
 283
 284         /* This is for userland consumption.  For some reason, the 40-bit
 285            PIO bias that we use in the kernel through KSEG didn't work for
 286            the page table based user mappings.  So make sure we get the
 287            43-bit PIO bias.  */
 288         hose->sparse_mem_base = 0;
 289         hose->sparse_io_base = 0;
 290         hose->dense_mem_base
 291           = (IRONGATE_MEM & 0xffffffffffUL) | 0x80000000000UL;
 292         hose->dense_io_base
 293           = (IRONGATE_IO & 0xffffffffffUL) | 0x80000000000UL;
 294
 295         hose->sg_isa = hose->sg_pci = NULL;
 296         __direct_map_base = 0;
 297         __direct_map_size = 0xffffffff;
 298 }
 299
 300 /*
 301  * IO map and AGP support
 302  */
 303 #include <linux/vmalloc.h>
 304 #include <linux/agp_backend.h>
 305 #include <linux/agpgart.h>
 306 #include <linux/export.h>
 307 #include <asm/pgalloc.h>
 308
 309 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
 310 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr))
 311
 312 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
 313 #define GET_GATT(addr) (gatt_pages[GET_PAGE_DIR_IDX(addr)])
 314
 315 void __iomem *
 316 irongate_ioremap(unsigned long addr, unsigned long size)
 317 {
 318         struct vm_struct *area;
 319         unsigned long vaddr;
 320         unsigned long baddr, last;
 321         u32 *mmio_regs, *gatt_pages, *cur_gatt, pte;
 322         unsigned long gart_bus_addr;
 323
 324         if (!alpha_agpgart_size)
 325                 return (void __iomem *)(addr + IRONGATE_MEM);
 326
 327         gart_bus_addr = (unsigned long)IRONGATE0->bar0 &
 328                         PCI_BASE_ADDRESS_MEM_MASK;
 329
 330         /*
 331          * Check for within the AGP aperture...
 332          */
 333         do {
 334                 /*
 335                  * Check the AGP area
 336                  */
 337                 if (addr >= gart_bus_addr && addr + size - 1 <
 338                     gart_bus_addr + alpha_agpgart_size)
 339                         break;
 340
 341                 /*
 342                  * Not found - assume legacy ioremap
 343                  */
 344                 return (void __iomem *)(addr + IRONGATE_MEM);
 345         } while(0);
 346
 347         mmio_regs = (u32 *)(((unsigned long)IRONGATE0->bar1 &
 348                         PCI_BASE_ADDRESS_MEM_MASK) + IRONGATE_MEM);
 349
 350         gatt_pages = (u32 *)(phys_to_virt(mmio_regs[1])); /* FIXME */
 351
 352         /*
 353          * Adjust the limits (mappings must be page aligned)
 354          */
 355         if (addr & ~PAGE_MASK) {
 356                 printk("AGP ioremap failed... addr not page aligned (0x%lx)\n",
 357                        addr);
 358                 return (void __iomem *)(addr + IRONGATE_MEM);
 359         }
 360         last = addr + size - 1;
 361         size = PAGE_ALIGN(last) - addr;
 362
 363 #if 0
 364         printk("irongate_ioremap(0x%lx, 0x%lx)\n", addr, size);
 365         printk("irongate_ioremap:  gart_bus_addr  0x%lx\n", gart_bus_addr);
 366         printk("irongate_ioremap:  gart_aper_size 0x%lx\n", gart_aper_size);
 367         printk("irongate_ioremap:  mmio_regs      %p\n", mmio_regs);
 368         printk("irongate_ioremap:  gatt_pages     %p\n", gatt_pages);
 369
 370         for(baddr = addr; baddr <= last; baddr += PAGE_SIZE)
 371         {
 372                 cur_gatt = phys_to_virt(GET_GATT(baddr) & ~1);
 373                 pte = cur_gatt[GET_GATT_OFF(baddr)] & ~1;
 374                 printk("irongate_ioremap:  cur_gatt %p pte 0x%x\n",
 375                        cur_gatt, pte);
 376         }
 377 #endif
 378
 379         /*
 380          * Map it
 381          */
 382         area = get_vm_area(size, VM_IOREMAP);
 383         if (!area) return NULL;
 384
 385         for(baddr = addr, vaddr = (unsigned long)area->addr;
 386             baddr <= last;
 387             baddr += PAGE_SIZE, vaddr += PAGE_SIZE)
 388         {
 389                 cur_gatt = phys_to_virt(GET_GATT(baddr) & ~1);
 390                 pte = cur_gatt[GET_GATT_OFF(baddr)] & ~1;
 391
 392                 if (__alpha_remap_area_pages(vaddr,
 393                                              pte, PAGE_SIZE, 0)) {
 394                         printk("AGP ioremap: FAILED to map...\n");
 395                         vfree(area->addr);
 396                         return NULL;
 397                 }
 398         }
 399
 400         flush_tlb_all();
 401
 402         vaddr = (unsigned long)area->addr + (addr & ~PAGE_MASK);
 403 #if 0
 404         printk("irongate_ioremap(0x%lx, 0x%lx) returning 0x%lx\n",
 405                addr, size, vaddr);
 406 #endif
 407         return (void __iomem *)vaddr;
 408 }
 409 EXPORT_SYMBOL(irongate_ioremap);
 410
 411 void
 412 irongate_iounmap(volatile void __iomem *xaddr)
 413 {
 414         unsigned long addr = (unsigned long) xaddr;
 415         if (((long)addr >> 41) == -2)
 416                 return; /* kseg map, nothing to do */
 417         if (addr)
 418                 return vfree((void *)(PAGE_MASK & addr));
 419 }
 420 EXPORT_SYMBOL(irongate_iounmap);