arch/alpha/kernel/sys_titan.c

   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(struct irq_data *d)
 116 {
 117         unsigned int irq = d->irq;
 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(struct irq_data *d)
 126 {
 127         unsigned int irq = d->irq;
 128         spin_lock(&titan_irq_lock);
 129         titan_cached_irq_mask &= ~(1UL << (irq - 16));
 130         titan_update_irq_hw(titan_cached_irq_mask);
 131         spin_unlock(&titan_irq_lock);
 132 }
 133
 134 static void
 135 titan_cpu_set_irq_affinity(unsigned int irq, cpumask_t affinity)
 136 {
 137         int cpu;
 138
 139         for (cpu = 0; cpu < 4; cpu++) {
 140                 if (cpu_isset(cpu, affinity))
 141                         titan_cpu_irq_affinity[cpu] |= 1UL << irq;
 142                 else
 143                         titan_cpu_irq_affinity[cpu] &= ~(1UL << irq);
 144         }
 145
 146 }
 147
 148 static int
 149 titan_set_irq_affinity(struct irq_data *d, const struct cpumask *affinity,
 150                        bool force)
 151 {
 152         spin_lock(&titan_irq_lock);
 153         titan_cpu_set_irq_affinity(irq - 16, *affinity);
 154         titan_update_irq_hw(titan_cached_irq_mask);
 155         spin_unlock(&titan_irq_lock);
 156
 157         return 0;
 158 }
 159
 160 static void
 161 titan_device_interrupt(unsigned long vector)
 162 {
 163         printk("titan_device_interrupt: NOT IMPLEMENTED YET!!\n");
 164 }
 165
 166 static void
 167 titan_srm_device_interrupt(unsigned long vector)
 168 {
 169         int irq;
 170
 171         irq = (vector - 0x800) >> 4;
 172         handle_irq(irq);
 173 }
 174
 175
 176 static void __init
 177 init_titan_irqs(struct irq_chip * ops, int imin, int imax)
 178 {
 179         long i;
 180         for (i = imin; i <= imax; ++i) {
 181                 set_irq_chip_and_handler(i, ops, handle_level_irq);
 182                 irq_set_status_flags(i, IRQ_LEVEL);
 183         }
 184 }
 185
 186 static struct irq_chip titan_irq_type = {
 187        .name                    = "TITAN",
 188        .irq_unmask              = titan_enable_irq,
 189        .irq_mask                = titan_disable_irq,
 190        .irq_mask_ack            = titan_disable_irq,
 191        .irq_set_affinity        = titan_set_irq_affinity,
 192 };
 193
 194 static irqreturn_t
 195 titan_intr_nop(int irq, void *dev_id)
 196 {
 197       /*
 198        * This is a NOP interrupt handler for the purposes of
 199        * event counting -- just return.
 200        */
 201        return IRQ_HANDLED;
 202 }
 203
 204 static void __init
 205 titan_init_irq(void)
 206 {
 207         if (alpha_using_srm && !alpha_mv.device_interrupt)
 208                 alpha_mv.device_interrupt = titan_srm_device_interrupt;
 209         if (!alpha_mv.device_interrupt)
 210                 alpha_mv.device_interrupt = titan_device_interrupt;
 211
 212         titan_update_irq_hw(0);
 213
 214         init_titan_irqs(&titan_irq_type, 16, 63 + 16);
 215 }
 216
 217 static void __init
 218 titan_legacy_init_irq(void)
 219 {
 220         /* init the legacy dma controller */
 221         outb(0, DMA1_RESET_REG);
 222         outb(0, DMA2_RESET_REG);
 223         outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
 224         outb(0, DMA2_MASK_REG);
 225
 226         /* init the legacy irq controller */
 227         init_i8259a_irqs();
 228
 229         /* init the titan irqs */
 230         titan_init_irq();
 231 }
 232
 233 void
 234 titan_dispatch_irqs(u64 mask)
 235 {
 236         unsigned long vector;
 237
 238         /*
 239          * Mask down to those interrupts which are enable on this processor
 240          */
 241         mask &= titan_cpu_irq_affinity[smp_processor_id()];
 242
 243         /*
 244          * Dispatch all requested interrupts
 245          */
 246         while (mask) {
 247                 /* convert to SRM vector... priority is <63> -> <0> */
 248                 vector = 63 - __kernel_ctlz(mask);
 249                 mask &= ~(1UL << vector);       /* clear it out          */
 250                 vector = 0x900 + (vector << 4); /* convert to SRM vector */
 251
 252                 /* dispatch it */
 253                 alpha_mv.device_interrupt(vector);
 254         }
 255 }
 256
 257 \f
 258 /*
 259  * Titan Family
 260  */
 261 static void __init
 262 titan_request_irq(unsigned int irq, irq_handler_t handler,
 263                   unsigned long irqflags, const char *devname,
 264                   void *dev_id)
 265 {
 266         int err;
 267         err = request_irq(irq, handler, irqflags, devname, dev_id);
 268         if (err) {
 269                 printk("titan_request_irq for IRQ %d returned %d; ignoring\n",
 270                        irq, err);
 271         }
 272 }
 273
 274 static void __init
 275 titan_late_init(void)
 276 {
 277         /*
 278          * Enable the system error interrupts. These interrupts are
 279          * all reported to the kernel as machine checks, so the handler
 280          * is a nop so it can be called to count the individual events.
 281          */
 282         titan_request_irq(63+16, titan_intr_nop, IRQF_DISABLED,
 283                     "CChip Error", NULL);
 284         titan_request_irq(62+16, titan_intr_nop, IRQF_DISABLED,
 285                     "PChip 0 H_Error", NULL);
 286         titan_request_irq(61+16, titan_intr_nop, IRQF_DISABLED,
 287                     "PChip 1 H_Error", NULL);
 288         titan_request_irq(60+16, titan_intr_nop, IRQF_DISABLED,
 289                     "PChip 0 C_Error", NULL);
 290         titan_request_irq(59+16, titan_intr_nop, IRQF_DISABLED,
 291                     "PChip 1 C_Error", NULL);
 292
 293         /*
 294          * Register our error handlers.
 295          */
 296         titan_register_error_handlers();
 297
 298         /*
 299          * Check if the console left us any error logs.
 300          */
 301         cdl_check_console_data_log();
 302
 303 }
 304
 305 static int __devinit
 306 titan_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 307 {
 308         u8 intline;
 309         int irq;
 310
 311         /* Get the current intline.  */
 312         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
 313         irq = intline;
 314
 315         /* Is it explicitly routed through ISA?  */
 316         if ((irq & 0xF0) == 0xE0)
 317                 return irq;
 318
 319         /* Offset by 16 to make room for ISA interrupts 0 - 15.  */
 320         return irq + 16;
 321 }
 322
 323 static void __init
 324 titan_init_pci(void)
 325 {
 326         /*
 327          * This isn't really the right place, but there's some init
 328          * that needs to be done after everything is basically up.
 329          */
 330         titan_late_init();
 331
 332         pci_probe_only = 1;
 333         common_init_pci();
 334         SMC669_Init(0);
 335         locate_and_init_vga(NULL);
 336 }
 337
 338 \f
 339 /*
 340  * Privateer
 341  */
 342 static void __init
 343 privateer_init_pci(void)
 344 {
 345         /*
 346          * Hook a couple of extra err interrupts that the
 347          * common titan code won't.
 348          */
 349         titan_request_irq(53+16, titan_intr_nop, IRQF_DISABLED,
 350                     "NMI", NULL);
 351         titan_request_irq(50+16, titan_intr_nop, IRQF_DISABLED,
 352                     "Temperature Warning", NULL);
 353
 354         /*
 355          * Finish with the common version.
 356          */
 357         return titan_init_pci();
 358 }
 359
 360 \f
 361 /*
 362  * The System Vectors.
 363  */
 364 struct alpha_machine_vector titan_mv __initmv = {
 365         .vector_name            = "TITAN",
 366         DO_EV6_MMU,
 367         DO_DEFAULT_RTC,
 368         DO_TITAN_IO,
 369         .machine_check          = titan_machine_check,
 370         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 371         .min_io_address         = DEFAULT_IO_BASE,
 372         .min_mem_address        = DEFAULT_MEM_BASE,
 373         .pci_dac_offset         = TITAN_DAC_OFFSET,
 374
 375         .nr_irqs                = 80,   /* 64 + 16 */
 376         /* device_interrupt will be filled in by titan_init_irq */
 377
 378         .agp_info               = titan_agp_info,
 379
 380         .init_arch              = titan_init_arch,
 381         .init_irq               = titan_legacy_init_irq,
 382         .init_rtc               = common_init_rtc,
 383         .init_pci               = titan_init_pci,
 384
 385         .kill_arch              = titan_kill_arch,
 386         .pci_map_irq            = titan_map_irq,
 387         .pci_swizzle            = common_swizzle,
 388 };
 389 ALIAS_MV(titan)
 390
 391 struct alpha_machine_vector privateer_mv __initmv = {
 392         .vector_name            = "PRIVATEER",
 393         DO_EV6_MMU,
 394         DO_DEFAULT_RTC,
 395         DO_TITAN_IO,
 396         .machine_check          = privateer_machine_check,
 397         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 398         .min_io_address         = DEFAULT_IO_BASE,
 399         .min_mem_address        = DEFAULT_MEM_BASE,
 400         .pci_dac_offset         = TITAN_DAC_OFFSET,
 401
 402         .nr_irqs                = 80,   /* 64 + 16 */
 403         /* device_interrupt will be filled in by titan_init_irq */
 404
 405         .agp_info               = titan_agp_info,
 406
 407         .init_arch              = titan_init_arch,
 408         .init_irq               = titan_legacy_init_irq,
 409         .init_rtc               = common_init_rtc,
 410         .init_pci               = privateer_init_pci,
 411
 412         .kill_arch              = titan_kill_arch,
 413         .pci_map_irq            = titan_map_irq,
 414         .pci_swizzle            = common_swizzle,
 415 };
 416 /* No alpha_mv alias for privateer since we compile it
 417    in unconditionally with titan; setup_arch knows how to cope. */