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/dma.h>
  25 #include <asm/irq.h>
  26 #include <asm/mmu_context.h>
  27 #include <asm/io.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/core_titan.h>
  30 #include <asm/hwrpb.h>
  31 #include <asm/tlbflush.h>
  32
  33 #include "proto.h"
  34 #include "irq_impl.h"
  35 #include "pci_impl.h"
  36 #include "machvec_impl.h"
  37 #include "err_impl.h"
  38
  39 \f
  40 /*
  41  * Titan generic
  42  */
  43
  44 /*
  45  * Titan supports up to 4 CPUs
  46  */
  47 static unsigned long titan_cpu_irq_affinity[4] = { ~0UL, ~0UL, ~0UL, ~0UL };
  48
  49 /*
  50  * Mask is set (1) if enabled
  51  */
  52 static unsigned long titan_cached_irq_mask;
  53
  54 /*
  55  * Need SMP-safe access to interrupt CSRs
  56  */
  57 DEFINE_SPINLOCK(titan_irq_lock);
  58
  59 static void
  60 titan_update_irq_hw(unsigned long mask)
  61 {
  62         register titan_cchip *cchip = TITAN_cchip;
  63         unsigned long isa_enable = 1UL << 55;
  64         register int bcpu = boot_cpuid;
  65
  66 #ifdef CONFIG_SMP
  67         cpumask_t cpm;
  68         volatile unsigned long *dim0, *dim1, *dim2, *dim3;
  69         unsigned long mask0, mask1, mask2, mask3, dummy;
  70
  71         cpumask_copy(&cpm, cpu_present_mask);
  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 (!cpumask_test_cpu(0, &cpm)) dim0 = &dummy;
  88         if (!cpumask_test_cpu(1, &cpm)) dim1 = &dummy;
  89         if (!cpumask_test_cpu(2, &cpm)) dim2 = &dummy;
  90         if (!cpumask_test_cpu(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 (cpumask_test_cpu(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         unsigned int irq = d->irq;
 153         spin_lock(&titan_irq_lock);
 154         titan_cpu_set_irq_affinity(irq - 16, *affinity);
 155         titan_update_irq_hw(titan_cached_irq_mask);
 156         spin_unlock(&titan_irq_lock);
 157
 158         return 0;
 159 }
 160
 161 static void
 162 titan_device_interrupt(unsigned long vector)
 163 {
 164         printk("titan_device_interrupt: NOT IMPLEMENTED YET!!\n");
 165 }
 166
 167 static void
 168 titan_srm_device_interrupt(unsigned long vector)
 169 {
 170         int irq;
 171
 172         irq = (vector - 0x800) >> 4;
 173         handle_irq(irq);
 174 }
 175
 176
 177 static void __init
 178 init_titan_irqs(struct irq_chip * ops, int imin, int imax)
 179 {
 180         long i;
 181         for (i = imin; i <= imax; ++i) {
 182                 irq_set_chip_and_handler(i, ops, handle_level_irq);
 183                 irq_set_status_flags(i, IRQ_LEVEL);
 184         }
 185 }
 186
 187 static struct irq_chip titan_irq_type = {
 188        .name                    = "TITAN",
 189        .irq_unmask              = titan_enable_irq,
 190        .irq_mask                = titan_disable_irq,
 191        .irq_mask_ack            = titan_disable_irq,
 192        .irq_set_affinity        = titan_set_irq_affinity,
 193 };
 194
 195 static irqreturn_t
 196 titan_intr_nop(int irq, void *dev_id)
 197 {
 198       /*
 199        * This is a NOP interrupt handler for the purposes of
 200        * event counting -- just return.
 201        */
 202        return IRQ_HANDLED;
 203 }
 204
 205 static void __init
 206 titan_init_irq(void)
 207 {
 208         if (alpha_using_srm && !alpha_mv.device_interrupt)
 209                 alpha_mv.device_interrupt = titan_srm_device_interrupt;
 210         if (!alpha_mv.device_interrupt)
 211                 alpha_mv.device_interrupt = titan_device_interrupt;
 212
 213         titan_update_irq_hw(0);
 214
 215         init_titan_irqs(&titan_irq_type, 16, 63 + 16);
 216 }
 217
 218 static void __init
 219 titan_legacy_init_irq(void)
 220 {
 221         /* init the legacy dma controller */
 222         outb(0, DMA1_RESET_REG);
 223         outb(0, DMA2_RESET_REG);
 224         outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
 225         outb(0, DMA2_MASK_REG);
 226
 227         /* init the legacy irq controller */
 228         init_i8259a_irqs();
 229
 230         /* init the titan irqs */
 231         titan_init_irq();
 232 }
 233
 234 void
 235 titan_dispatch_irqs(u64 mask)
 236 {
 237         unsigned long vector;
 238
 239         /*
 240          * Mask down to those interrupts which are enable on this processor
 241          */
 242         mask &= titan_cpu_irq_affinity[smp_processor_id()];
 243
 244         /*
 245          * Dispatch all requested interrupts
 246          */
 247         while (mask) {
 248                 /* convert to SRM vector... priority is <63> -> <0> */
 249                 vector = 63 - __kernel_ctlz(mask);
 250                 mask &= ~(1UL << vector);       /* clear it out          */
 251                 vector = 0x900 + (vector << 4); /* convert to SRM vector */
 252
 253                 /* dispatch it */
 254                 alpha_mv.device_interrupt(vector);
 255         }
 256 }
 257
 258 \f
 259 /*
 260  * Titan Family
 261  */
 262 static void __init
 263 titan_request_irq(unsigned int irq, irq_handler_t handler,
 264                   unsigned long irqflags, const char *devname,
 265                   void *dev_id)
 266 {
 267         int err;
 268         err = request_irq(irq, handler, irqflags, devname, dev_id);
 269         if (err) {
 270                 printk("titan_request_irq for IRQ %d returned %d; ignoring\n",
 271                        irq, err);
 272         }
 273 }
 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         titan_request_irq(63+16, titan_intr_nop, 0,
 284                     "CChip Error", NULL);
 285         titan_request_irq(62+16, titan_intr_nop, 0,
 286                     "PChip 0 H_Error", NULL);
 287         titan_request_irq(61+16, titan_intr_nop, 0,
 288                     "PChip 1 H_Error", NULL);
 289         titan_request_irq(60+16, titan_intr_nop, 0,
 290                     "PChip 0 C_Error", NULL);
 291         titan_request_irq(59+16, titan_intr_nop, 0,
 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
 307 titan_map_irq(const 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         /* Indicate that we trust the console to configure things properly */
 334         pci_set_flags(PCI_PROBE_ONLY);
 335         common_init_pci();
 336         SMC669_Init(0);
 337         locate_and_init_vga(NULL);
 338 }
 339
 340 \f
 341 /*
 342  * Privateer
 343  */
 344 static void __init
 345 privateer_init_pci(void)
 346 {
 347         /*
 348          * Hook a couple of extra err interrupts that the
 349          * common titan code won't.
 350          */
 351         titan_request_irq(53+16, titan_intr_nop, 0,
 352                     "NMI", NULL);
 353         titan_request_irq(50+16, titan_intr_nop, 0,
 354                     "Temperature Warning", NULL);
 355
 356         /*
 357          * Finish with the common version.
 358          */
 359         return titan_init_pci();
 360 }
 361
 362 \f
 363 /*
 364  * The System Vectors.
 365  */
 366 struct alpha_machine_vector titan_mv __initmv = {
 367         .vector_name            = "TITAN",
 368         DO_EV6_MMU,
 369         DO_DEFAULT_RTC,
 370         DO_TITAN_IO,
 371         .machine_check          = titan_machine_check,
 372         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 373         .min_io_address         = DEFAULT_IO_BASE,
 374         .min_mem_address        = DEFAULT_MEM_BASE,
 375         .pci_dac_offset         = TITAN_DAC_OFFSET,
 376
 377         .nr_irqs                = 80,   /* 64 + 16 */
 378         /* device_interrupt will be filled in by titan_init_irq */
 379
 380         .agp_info               = titan_agp_info,
 381
 382         .init_arch              = titan_init_arch,
 383         .init_irq               = titan_legacy_init_irq,
 384         .init_rtc               = common_init_rtc,
 385         .init_pci               = titan_init_pci,
 386
 387         .kill_arch              = titan_kill_arch,
 388         .pci_map_irq            = titan_map_irq,
 389         .pci_swizzle            = common_swizzle,
 390 };
 391 ALIAS_MV(titan)
 392
 393 struct alpha_machine_vector privateer_mv __initmv = {
 394         .vector_name            = "PRIVATEER",
 395         DO_EV6_MMU,
 396         DO_DEFAULT_RTC,
 397         DO_TITAN_IO,
 398         .machine_check          = privateer_machine_check,
 399         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 400         .min_io_address         = DEFAULT_IO_BASE,
 401         .min_mem_address        = DEFAULT_MEM_BASE,
 402         .pci_dac_offset         = TITAN_DAC_OFFSET,
 403
 404         .nr_irqs                = 80,   /* 64 + 16 */
 405         /* device_interrupt will be filled in by titan_init_irq */
 406
 407         .agp_info               = titan_agp_info,
 408
 409         .init_arch              = titan_init_arch,
 410         .init_irq               = titan_legacy_init_irq,
 411         .init_rtc               = common_init_rtc,
 412         .init_pci               = privateer_init_pci,
 413
 414         .kill_arch              = titan_kill_arch,
 415         .pci_map_irq            = titan_map_irq,
 416         .pci_swizzle            = common_swizzle,
 417 };
 418 /* No alpha_mv alias for privateer since we compile it
 419    in unconditionally with titan; setup_arch knows how to cope. */