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