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   1 /*
   2  *      linux/arch/alpha/kernel/sys_titan.c
   3  *
   4  *      Copyright (C) 1995 David A Rusling
   5  *      Copyright (C) 1996, 1999 Jay A Estabrook
   6  *      Copyright (C) 1998, 1999 Richard Henderson
   7  *      Copyright (C) 1999, 2000 Jeff Wiedemeier
   8  *
   9  * Code supporting TITAN systems (EV6+TITAN), currently:
  10  *      Privateer
  11  *      Falcon
  12  *      Granite
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/types.h>
  17 #include <linux/mm.h>
  18 #include <linux/sched.h>
  19 #include <linux/pci.h>
  20 #include <linux/init.h>
  21 #include <linux/bitops.h>
  22
  23 #include <asm/ptrace.h>
  24 #include <asm/system.h>
  25 #include <asm/dma.h>
  26 #include <asm/irq.h>
  27 #include <asm/mmu_context.h>
  28 #include <asm/io.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/core_titan.h>
  31 #include <asm/hwrpb.h>
  32 #include <asm/tlbflush.h>
  33
  34 #include "proto.h"
  35 #include "irq_impl.h"
  36 #include "pci_impl.h"
  37 #include "machvec_impl.h"
  38 #include "err_impl.h"
  39
  40 \f
  41 /*
  42  * Titan generic
  43  */
  44
  45 /*
  46  * Titan supports up to 4 CPUs
  47  */
  48 static unsigned long titan_cpu_irq_affinity[4] = { ~0UL, ~0UL, ~0UL, ~0UL };
  49
  50 /*
  51  * Mask is set (1) if enabled
  52  */
  53 static unsigned long titan_cached_irq_mask;
  54
  55 /*
  56  * Need SMP-safe access to interrupt CSRs
  57  */
  58 DEFINE_SPINLOCK(titan_irq_lock);
  59
  60 static void
  61 titan_update_irq_hw(unsigned long mask)
  62 {
  63         register titan_cchip *cchip = TITAN_cchip;
  64         unsigned long isa_enable = 1UL << 55;
  65         register int bcpu = boot_cpuid;
  66
  67 #ifdef CONFIG_SMP
  68         cpumask_t cpm = cpu_present_map;
  69         volatile unsigned long *dim0, *dim1, *dim2, *dim3;
  70         unsigned long mask0, mask1, mask2, mask3, dummy;
  71
  72         mask &= ~isa_enable;
  73         mask0 = mask & titan_cpu_irq_affinity[0];
  74         mask1 = mask & titan_cpu_irq_affinity[1];
  75         mask2 = mask & titan_cpu_irq_affinity[2];
  76         mask3 = mask & titan_cpu_irq_affinity[3];
  77
  78         if (bcpu == 0) mask0 |= isa_enable;
  79         else if (bcpu == 1) mask1 |= isa_enable;
  80         else if (bcpu == 2) mask2 |= isa_enable;
  81         else mask3 |= isa_enable;
  82
  83         dim0 = &cchip->dim0.csr;
  84         dim1 = &cchip->dim1.csr;
  85         dim2 = &cchip->dim2.csr;
  86         dim3 = &cchip->dim3.csr;
  87         if (!cpu_isset(0, cpm)) dim0 = &dummy;
  88         if (!cpu_isset(1, cpm)) dim1 = &dummy;
  89         if (!cpu_isset(2, cpm)) dim2 = &dummy;
  90         if (!cpu_isset(3, cpm)) dim3 = &dummy;
  91
  92         *dim0 = mask0;
  93         *dim1 = mask1;
  94         *dim2 = mask2;
  95         *dim3 = mask3;
  96         mb();
  97         *dim0;
  98         *dim1;
  99         *dim2;
 100         *dim3;
 101 #else
 102         volatile unsigned long *dimB;
 103         dimB = &cchip->dim0.csr;
 104         if (bcpu == 1) dimB = &cchip->dim1.csr;
 105         else if (bcpu == 2) dimB = &cchip->dim2.csr;
 106         else if (bcpu == 3) dimB = &cchip->dim3.csr;
 107
 108         *dimB = mask | isa_enable;
 109         mb();
 110         *dimB;
 111 #endif
 112 }
 113
 114 static inline void
 115 titan_enable_irq(unsigned int irq)
 116 {
 117         spin_lock(&titan_irq_lock);
 118         titan_cached_irq_mask |= 1UL << (irq - 16);
 119         titan_update_irq_hw(titan_cached_irq_mask);
 120         spin_unlock(&titan_irq_lock);
 121 }
 122
 123 static inline void
 124 titan_disable_irq(unsigned int irq)
 125 {
 126         spin_lock(&titan_irq_lock);
 127         titan_cached_irq_mask &= ~(1UL << (irq - 16));
 128         titan_update_irq_hw(titan_cached_irq_mask);
 129         spin_unlock(&titan_irq_lock);
 130 }
 131
 132 static unsigned int
 133 titan_startup_irq(unsigned int irq)
 134 {
 135         titan_enable_irq(irq);
 136         return 0;       /* never anything pending */
 137 }
 138
 139 static void
 140 titan_end_irq(unsigned int irq)
 141 {
 142         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 143                 titan_enable_irq(irq);
 144 }
 145
 146 static void
 147 titan_cpu_set_irq_affinity(unsigned int irq, cpumask_t affinity)
 148 {
 149         int cpu;
 150
 151         for (cpu = 0; cpu < 4; cpu++) {
 152                 if (cpu_isset(cpu, affinity))
 153                         titan_cpu_irq_affinity[cpu] |= 1UL << irq;
 154                 else
 155                         titan_cpu_irq_affinity[cpu] &= ~(1UL << irq);
 156         }
 157
 158 }
 159
 160 static int
 161 titan_set_irq_affinity(unsigned int irq, const struct cpumask *affinity)
 162 {
 163         spin_lock(&titan_irq_lock);
 164         titan_cpu_set_irq_affinity(irq - 16, *affinity);
 165         titan_update_irq_hw(titan_cached_irq_mask);
 166         spin_unlock(&titan_irq_lock);
 167
 168         return 0;
 169 }
 170
 171 static void
 172 titan_device_interrupt(unsigned long vector)
 173 {
 174         printk("titan_device_interrupt: NOT IMPLEMENTED YET!! \n");
 175 }
 176
 177 static void
 178 titan_srm_device_interrupt(unsigned long vector)
 179 {
 180         int irq;
 181
 182         irq = (vector - 0x800) >> 4;
 183         handle_irq(irq);
 184 }
 185
 186
 187 static void __init
 188 init_titan_irqs(struct irq_chip * ops, int imin, int imax)
 189 {
 190         long i;
 191         for (i = imin; i <= imax; ++i) {
 192                 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
 193                 irq_desc[i].chip = ops;
 194         }
 195 }
 196
 197 static struct irq_chip titan_irq_type = {
 198        .typename       = "TITAN",
 199        .startup        = titan_startup_irq,
 200        .shutdown       = titan_disable_irq,
 201        .enable         = titan_enable_irq,
 202        .disable        = titan_disable_irq,
 203        .ack            = titan_disable_irq,
 204        .end            = titan_end_irq,
 205        .set_affinity   = titan_set_irq_affinity,
 206 };
 207
 208 static irqreturn_t
 209 titan_intr_nop(int irq, void *dev_id)
 210 {
 211       /*
 212        * This is a NOP interrupt handler for the purposes of
 213        * event counting -- just return.
 214        */
 215        return IRQ_HANDLED;
 216 }
 217
 218 static void __init
 219 titan_init_irq(void)
 220 {
 221         if (alpha_using_srm && !alpha_mv.device_interrupt)
 222                 alpha_mv.device_interrupt = titan_srm_device_interrupt;
 223         if (!alpha_mv.device_interrupt)
 224                 alpha_mv.device_interrupt = titan_device_interrupt;
 225
 226         titan_update_irq_hw(0);
 227
 228         init_titan_irqs(&titan_irq_type, 16, 63 + 16);
 229 }
 230
 231 static void __init
 232 titan_legacy_init_irq(void)
 233 {
 234         /* init the legacy dma controller */
 235         outb(0, DMA1_RESET_REG);
 236         outb(0, DMA2_RESET_REG);
 237         outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
 238         outb(0, DMA2_MASK_REG);
 239
 240         /* init the legacy irq controller */
 241         init_i8259a_irqs();
 242
 243         /* init the titan irqs */
 244         titan_init_irq();
 245 }
 246
 247 void
 248 titan_dispatch_irqs(u64 mask)
 249 {
 250         unsigned long vector;
 251
 252         /*
 253          * Mask down to those interrupts which are enable on this processor
 254          */
 255         mask &= titan_cpu_irq_affinity[smp_processor_id()];
 256
 257         /*
 258          * Dispatch all requested interrupts
 259          */
 260         while (mask) {
 261                 /* convert to SRM vector... priority is <63> -> <0> */
 262                 vector = 63 - __kernel_ctlz(mask);
 263                 mask &= ~(1UL << vector);       /* clear it out          */
 264                 vector = 0x900 + (vector << 4); /* convert to SRM vector */
 265
 266                 /* dispatch it */
 267                 alpha_mv.device_interrupt(vector);
 268         }
 269 }
 270
 271 \f
 272 /*
 273  * Titan Family
 274  */
 275 static void __init
 276 titan_request_irq(unsigned int irq, irq_handler_t handler,
 277                   unsigned long irqflags, const char *devname,
 278                   void *dev_id)
 279 {
 280         int err;
 281         err = request_irq(irq, handler, irqflags, devname, dev_id);
 282         if (err) {
 283                 printk("titan_request_irq for IRQ %d returned %d; ignoring\n",
 284                        irq, err);
 285         }
 286 }
 287
 288 static void __init
 289 titan_late_init(void)
 290 {
 291         /*
 292          * Enable the system error interrupts. These interrupts are
 293          * all reported to the kernel as machine checks, so the handler
 294          * is a nop so it can be called to count the individual events.
 295          */
 296         titan_request_irq(63+16, titan_intr_nop, IRQF_DISABLED,
 297                     "CChip Error", NULL);
 298         titan_request_irq(62+16, titan_intr_nop, IRQF_DISABLED,
 299                     "PChip 0 H_Error", NULL);
 300         titan_request_irq(61+16, titan_intr_nop, IRQF_DISABLED,
 301                     "PChip 1 H_Error", NULL);
 302         titan_request_irq(60+16, titan_intr_nop, IRQF_DISABLED,
 303                     "PChip 0 C_Error", NULL);
 304         titan_request_irq(59+16, titan_intr_nop, IRQF_DISABLED,
 305                     "PChip 1 C_Error", NULL);
 306
 307         /*
 308          * Register our error handlers.
 309          */
 310         titan_register_error_handlers();
 311
 312         /*
 313          * Check if the console left us any error logs.
 314          */
 315         cdl_check_console_data_log();
 316
 317 }
 318
 319 static int __devinit
 320 titan_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 321 {
 322         u8 intline;
 323         int irq;
 324
 325         /* Get the current intline.  */
 326         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
 327         irq = intline;
 328
 329         /* Is it explicitly routed through ISA?  */
 330         if ((irq & 0xF0) == 0xE0)
 331                 return irq;
 332
 333         /* Offset by 16 to make room for ISA interrupts 0 - 15.  */
 334         return irq + 16;
 335 }
 336
 337 static void __init
 338 titan_init_pci(void)
 339 {
 340         /*
 341          * This isn't really the right place, but there's some init
 342          * that needs to be done after everything is basically up.
 343          */
 344         titan_late_init();
 345
 346         pci_probe_only = 1;
 347         common_init_pci();
 348         SMC669_Init(0);
 349         locate_and_init_vga(NULL);
 350 }
 351
 352 \f
 353 /*
 354  * Privateer
 355  */
 356 static void __init
 357 privateer_init_pci(void)
 358 {
 359         /*
 360          * Hook a couple of extra err interrupts that the
 361          * common titan code won't.
 362          */
 363         titan_request_irq(53+16, titan_intr_nop, IRQF_DISABLED,
 364                     "NMI", NULL);
 365         titan_request_irq(50+16, titan_intr_nop, IRQF_DISABLED,
 366                     "Temperature Warning", NULL);
 367
 368         /*
 369          * Finish with the common version.
 370          */
 371         return titan_init_pci();
 372 }
 373
 374 \f
 375 /*
 376  * The System Vectors.
 377  */
 378 struct alpha_machine_vector titan_mv __initmv = {
 379         .vector_name            = "TITAN",
 380         DO_EV6_MMU,
 381         DO_DEFAULT_RTC,
 382         DO_TITAN_IO,
 383         .machine_check          = titan_machine_check,
 384         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 385         .min_io_address         = DEFAULT_IO_BASE,
 386         .min_mem_address        = DEFAULT_MEM_BASE,
 387         .pci_dac_offset         = TITAN_DAC_OFFSET,
 388
 389         .nr_irqs                = 80,   /* 64 + 16 */
 390         /* device_interrupt will be filled in by titan_init_irq */
 391
 392         .agp_info               = titan_agp_info,
 393
 394         .init_arch              = titan_init_arch,
 395         .init_irq               = titan_legacy_init_irq,
 396         .init_rtc               = common_init_rtc,
 397         .init_pci               = titan_init_pci,
 398
 399         .kill_arch              = titan_kill_arch,
 400         .pci_map_irq            = titan_map_irq,
 401         .pci_swizzle            = common_swizzle,
 402 };
 403 ALIAS_MV(titan)
 404
 405 struct alpha_machine_vector privateer_mv __initmv = {
 406         .vector_name            = "PRIVATEER",
 407         DO_EV6_MMU,
 408         DO_DEFAULT_RTC,
 409         DO_TITAN_IO,
 410         .machine_check          = privateer_machine_check,
 411         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 412         .min_io_address         = DEFAULT_IO_BASE,
 413         .min_mem_address        = DEFAULT_MEM_BASE,
 414         .pci_dac_offset         = TITAN_DAC_OFFSET,
 415
 416         .nr_irqs                = 80,   /* 64 + 16 */
 417         /* device_interrupt will be filled in by titan_init_irq */
 418
 419         .agp_info               = titan_agp_info,
 420
 421         .init_arch              = titan_init_arch,
 422         .init_irq               = titan_legacy_init_irq,
 423         .init_rtc               = common_init_rtc,
 424         .init_pci               = privateer_init_pci,
 425
 426         .kill_arch              = titan_kill_arch,
 427         .pci_map_irq            = titan_map_irq,
 428         .pci_swizzle            = common_swizzle,
 429 };
 430 /* No alpha_mv alias for privateer since we compile it
 431    in unconditionally with titan; setup_arch knows how to cope. */