arch/alpha/kernel/core_apecs.c

   1 /*
   2  *      linux/arch/alpha/kernel/core_apecs.c
   3  *
   4  * Rewritten for Apecs from the lca.c from:
   5  *
   6  * Written by David Mosberger (davidm@cs.arizona.edu) with some code
   7  * taken from Dave Rusling's (david.rusling@reo.mts.dec.com) 32-bit
   8  * bios code.
   9  *
  10  * Code common to all APECS core logic chips.
  11  */
  12
  13 #define __EXTERN_INLINE inline
  14 #include <asm/io.h>
  15 #include <asm/core_apecs.h>
  16 #undef __EXTERN_INLINE
  17
  18 #include <linux/types.h>
  19 #include <linux/pci.h>
  20 #include <linux/init.h>
  21
  22 #include <asm/ptrace.h>
  23 #include <asm/smp.h>
  24
  25 #include "proto.h"
  26 #include "pci_impl.h"
  27
  28 /*
  29  * NOTE: Herein lie back-to-back mb instructions.  They are magic.
  30  * One plausible explanation is that the i/o controller does not properly
  31  * handle the system transaction.  Another involves timing.  Ho hum.
  32  */
  33
  34 /*
  35  * BIOS32-style PCI interface:
  36  */
  37
  38 #define DEBUG_CONFIG 0
  39
  40 #if DEBUG_CONFIG
  41 # define DBGC(args)     printk args
  42 #else
  43 # define DBGC(args)
  44 #endif
  45
  46 #define vuip    volatile unsigned int  *
  47
  48 /*
  49  * Given a bus, device, and function number, compute resulting
  50  * configuration space address and setup the APECS_HAXR2 register
  51  * accordingly.  It is therefore not safe to have concurrent
  52  * invocations to configuration space access routines, but there
  53  * really shouldn't be any need for this.
  54  *
  55  * Type 0:
  56  *
  57  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
  58  *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
  59  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  60  * | | | | | | | | | | | | | | | | | | | | | | | |F|F|F|R|R|R|R|R|R|0|0|
  61  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  62  *
  63  *      31:11   Device select bit.
  64  *      10:8    Function number
  65  *       7:2    Register number
  66  *
  67  * Type 1:
  68  *
  69  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
  70  *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
  71  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  72  * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
  73  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  74  *
  75  *      31:24   reserved
  76  *      23:16   bus number (8 bits = 128 possible buses)
  77  *      15:11   Device number (5 bits)
  78  *      10:8    function number
  79  *       7:2    register number
  80  *
  81  * Notes:
  82  *      The function number selects which function of a multi-function device
  83  *      (e.g., SCSI and Ethernet).
  84  *
  85  *      The register selects a DWORD (32 bit) register offset.  Hence it
  86  *      doesn't get shifted by 2 bits as we want to "drop" the bottom two
  87  *      bits.
  88  */
  89
  90 static int
  91 mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
  92              unsigned long *pci_addr, unsigned char *type1)
  93 {
  94         unsigned long addr;
  95         u8 bus = pbus->number;
  96
  97         DBGC(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x,"
  98               " pci_addr=0x%p, type1=0x%p)\n",
  99               bus, device_fn, where, pci_addr, type1));
 100
 101         if (bus == 0) {
 102                 int device = device_fn >> 3;
 103
 104                 /* type 0 configuration cycle: */
 105
 106                 if (device > 20) {
 107                         DBGC(("mk_conf_addr: device (%d) > 20, returning -1\n",
 108                               device));
 109                         return -1;
 110                 }
 111
 112                 *type1 = 0;
 113                 addr = (device_fn << 8) | (where);
 114         } else {
 115                 /* type 1 configuration cycle: */
 116                 *type1 = 1;
 117                 addr = (bus << 16) | (device_fn << 8) | (where);
 118         }
 119         *pci_addr = addr;
 120         DBGC(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
 121         return 0;
 122 }
 123
 124 static unsigned int
 125 conf_read(unsigned long addr, unsigned char type1)
 126 {
 127         unsigned long flags;
 128         unsigned int stat0, value;
 129         unsigned int haxr2 = 0;
 130
 131         local_irq_save(flags);  /* avoid getting hit by machine check */
 132
 133         DBGC(("conf_read(addr=0x%lx, type1=%d)\n", addr, type1));
 134
 135         /* Reset status register to avoid losing errors.  */
 136         stat0 = *(vuip)APECS_IOC_DCSR;
 137         *(vuip)APECS_IOC_DCSR = stat0;
 138         mb();
 139         DBGC(("conf_read: APECS DCSR was 0x%x\n", stat0));
 140
 141         /* If Type1 access, must set HAE #2. */
 142         if (type1) {
 143                 haxr2 = *(vuip)APECS_IOC_HAXR2;
 144                 mb();
 145                 *(vuip)APECS_IOC_HAXR2 = haxr2 | 1;
 146                 DBGC(("conf_read: TYPE1 access\n"));
 147         }
 148
 149         draina();
 150         mcheck_expected(0) = 1;
 151         mcheck_taken(0) = 0;
 152         mb();
 153
 154         /* Access configuration space.  */
 155
 156         /* Some SRMs step on these registers during a machine check.  */
 157         asm volatile("ldl %0,%1; mb; mb" : "=r"(value) : "m"(*(vuip)addr)
 158                      : "$9", "$10", "$11", "$12", "$13", "$14", "memory");
 159
 160         if (mcheck_taken(0)) {
 161                 mcheck_taken(0) = 0;
 162                 value = 0xffffffffU;
 163                 mb();
 164         }
 165         mcheck_expected(0) = 0;
 166         mb();
 167
 168 #if 1
 169         /*
 170          * david.rusling@reo.mts.dec.com.  This code is needed for the
 171          * EB64+ as it does not generate a machine check (why I don't
 172          * know).  When we build kernels for one particular platform
 173          * then we can make this conditional on the type.
 174          */
 175         draina();
 176
 177         /* Now look for any errors.  */
 178         stat0 = *(vuip)APECS_IOC_DCSR;
 179         DBGC(("conf_read: APECS DCSR after read 0x%x\n", stat0));
 180
 181         /* Is any error bit set? */
 182         if (stat0 & 0xffe0U) {
 183                 /* If not NDEV, print status.  */
 184                 if (!(stat0 & 0x0800)) {
 185                         printk("apecs.c:conf_read: got stat0=%x\n", stat0);
 186                 }
 187
 188                 /* Reset error status.  */
 189                 *(vuip)APECS_IOC_DCSR = stat0;
 190                 mb();
 191                 wrmces(0x7);                    /* reset machine check */
 192                 value = 0xffffffff;
 193         }
 194 #endif
 195
 196         /* If Type1 access, must reset HAE #2 so normal IO space ops work.  */
 197         if (type1) {
 198                 *(vuip)APECS_IOC_HAXR2 = haxr2 & ~1;
 199                 mb();
 200         }
 201         local_irq_restore(flags);
 202
 203         return value;
 204 }
 205
 206 static void
 207 conf_write(unsigned long addr, unsigned int value, unsigned char type1)
 208 {
 209         unsigned long flags;
 210         unsigned int stat0;
 211         unsigned int haxr2 = 0;
 212
 213         local_irq_save(flags);  /* avoid getting hit by machine check */
 214
 215         /* Reset status register to avoid losing errors.  */
 216         stat0 = *(vuip)APECS_IOC_DCSR;
 217         *(vuip)APECS_IOC_DCSR = stat0;
 218         mb();
 219
 220         /* If Type1 access, must set HAE #2. */
 221         if (type1) {
 222                 haxr2 = *(vuip)APECS_IOC_HAXR2;
 223                 mb();
 224                 *(vuip)APECS_IOC_HAXR2 = haxr2 | 1;
 225         }
 226
 227         draina();
 228         mcheck_expected(0) = 1;
 229         mb();
 230
 231         /* Access configuration space.  */
 232         *(vuip)addr = value;
 233         mb();
 234         mb();  /* magic */
 235         mcheck_expected(0) = 0;
 236         mb();
 237
 238 #if 1
 239         /*
 240          * david.rusling@reo.mts.dec.com.  This code is needed for the
 241          * EB64+ as it does not generate a machine check (why I don't
 242          * know).  When we build kernels for one particular platform
 243          * then we can make this conditional on the type.
 244          */
 245         draina();
 246
 247         /* Now look for any errors.  */
 248         stat0 = *(vuip)APECS_IOC_DCSR;
 249
 250         /* Is any error bit set? */
 251         if (stat0 & 0xffe0U) {
 252                 /* If not NDEV, print status.  */
 253                 if (!(stat0 & 0x0800)) {
 254                         printk("apecs.c:conf_write: got stat0=%x\n", stat0);
 255                 }
 256
 257                 /* Reset error status.  */
 258                 *(vuip)APECS_IOC_DCSR = stat0;
 259                 mb();
 260                 wrmces(0x7);                    /* reset machine check */
 261         }
 262 #endif
 263
 264         /* If Type1 access, must reset HAE #2 so normal IO space ops work.  */
 265         if (type1) {
 266                 *(vuip)APECS_IOC_HAXR2 = haxr2 & ~1;
 267                 mb();
 268         }
 269         local_irq_restore(flags);
 270 }
 271
 272 static int
 273 apecs_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 274                   int size, u32 *value)
 275 {
 276         unsigned long addr, pci_addr;
 277         unsigned char type1;
 278         long mask;
 279         int shift;
 280
 281         if (mk_conf_addr(bus, devfn, where, &pci_addr, &type1))
 282                 return PCIBIOS_DEVICE_NOT_FOUND;
 283
 284         mask = (size - 1) * 8;
 285         shift = (where & 3) * 8;
 286         addr = (pci_addr << 5) + mask + APECS_CONF;
 287         *value = conf_read(addr, type1) >> (shift);
 288         return PCIBIOS_SUCCESSFUL;
 289 }
 290
 291 static int
 292 apecs_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 293                    int size, u32 value)
 294 {
 295         unsigned long addr, pci_addr;
 296         unsigned char type1;
 297         long mask;
 298
 299         if (mk_conf_addr(bus, devfn, where, &pci_addr, &type1))
 300                 return PCIBIOS_DEVICE_NOT_FOUND;
 301
 302         mask = (size - 1) * 8;
 303         addr = (pci_addr << 5) + mask + APECS_CONF;
 304         conf_write(addr, value << ((where & 3) * 8), type1);
 305         return PCIBIOS_SUCCESSFUL;
 306 }
 307
 308 struct pci_ops apecs_pci_ops =
 309 {
 310         .read =         apecs_read_config,
 311         .write =        apecs_write_config,
 312 };
 313 \f
 314 void
 315 apecs_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
 316 {
 317         wmb();
 318         *(vip)APECS_IOC_TBIA = 0;
 319         mb();
 320 }
 321 \f
 322 void __init
 323 apecs_init_arch(void)
 324 {
 325         struct pci_controller *hose;
 326
 327         /*
 328          * Create our single hose.
 329          */
 330
 331         pci_isa_hose = hose = alloc_pci_controller();
 332         hose->io_space = &ioport_resource;
 333         hose->mem_space = &iomem_resource;
 334         hose->index = 0;
 335
 336         hose->sparse_mem_base = APECS_SPARSE_MEM - IDENT_ADDR;
 337         hose->dense_mem_base = APECS_DENSE_MEM - IDENT_ADDR;
 338         hose->sparse_io_base = APECS_IO - IDENT_ADDR;
 339         hose->dense_io_base = 0;
 340
 341         /*
 342          * Set up the PCI to main memory translation windows.
 343          *
 344          * Window 1 is direct access 1GB at 1GB
 345          * Window 2 is scatter-gather 8MB at 8MB (for isa)
 346          */
 347         hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, 0);
 348         hose->sg_pci = NULL;
 349         __direct_map_base = 0x40000000;
 350         __direct_map_size = 0x40000000;
 351
 352         *(vuip)APECS_IOC_PB1R = __direct_map_base | 0x00080000;
 353         *(vuip)APECS_IOC_PM1R = (__direct_map_size - 1) & 0xfff00000U;
 354         *(vuip)APECS_IOC_TB1R = 0;
 355
 356         *(vuip)APECS_IOC_PB2R = hose->sg_isa->dma_base | 0x000c0000;
 357         *(vuip)APECS_IOC_PM2R = (hose->sg_isa->size - 1) & 0xfff00000;
 358         *(vuip)APECS_IOC_TB2R = virt_to_phys(hose->sg_isa->ptes) >> 1;
 359
 360         apecs_pci_tbi(hose, 0, -1);
 361
 362         /*
 363          * Finally, clear the HAXR2 register, which gets used
 364          * for PCI Config Space accesses. That is the way
 365          * we want to use it, and we do not want to depend on
 366          * what ARC or SRM might have left behind...
 367          */
 368         *(vuip)APECS_IOC_HAXR2 = 0;
 369         mb();
 370 }
 371
 372 void
 373 apecs_pci_clr_err(void)
 374 {
 375         unsigned int jd;
 376
 377         jd = *(vuip)APECS_IOC_DCSR;
 378         if (jd & 0xffe0L) {
 379                 *(vuip)APECS_IOC_SEAR;
 380                 *(vuip)APECS_IOC_DCSR = jd | 0xffe1L;
 381                 mb();
 382                 *(vuip)APECS_IOC_DCSR;
 383         }
 384         *(vuip)APECS_IOC_TBIA = (unsigned int)APECS_IOC_TBIA;
 385         mb();
 386         *(vuip)APECS_IOC_TBIA;
 387 }
 388
 389 void
 390 apecs_machine_check(unsigned long vector, unsigned long la_ptr,
 391                     struct pt_regs * regs)
 392 {
 393         struct el_common *mchk_header;
 394         struct el_apecs_procdata *mchk_procdata;
 395         struct el_apecs_sysdata_mcheck *mchk_sysdata;
 396
 397         mchk_header = (struct el_common *)la_ptr;
 398
 399         mchk_procdata = (struct el_apecs_procdata *)
 400                 (la_ptr + mchk_header->proc_offset
 401                  - sizeof(mchk_procdata->paltemp));
 402
 403         mchk_sysdata = (struct el_apecs_sysdata_mcheck *)
 404                 (la_ptr + mchk_header->sys_offset);
 405
 406
 407         /* Clear the error before any reporting.  */
 408         mb();
 409         mb(); /* magic */
 410         draina();
 411         apecs_pci_clr_err();
 412         wrmces(0x7);            /* reset machine check pending flag */
 413         mb();
 414
 415         process_mcheck_info(vector, la_ptr, regs, "APECS",
 416                             (mcheck_expected(0)
 417                              && (mchk_sysdata->epic_dcsr & 0x0c00UL)));
 418 }