arch/alpha/kernel/sys_titan.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      linux/arch/alpha/kernel/sys_titan.c
   4  *
   5  *      Copyright (C) 1995 David A Rusling
   6  *      Copyright (C) 1996, 1999 Jay A Estabrook
   7  *      Copyright (C) 1998, 1999 Richard Henderson
   8  *      Copyright (C) 1999, 2000 Jeff Wiedemeier
   9  *
  10  * Code supporting TITAN systems (EV6+TITAN), currently:
  11  *      Privateer
  12  *      Falcon
  13  *      Granite
  14  */
  15
  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/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;
  69         volatile unsigned long *dim0, *dim1, *dim2, *dim3;
  70         unsigned long mask0, mask1, mask2, mask3, dummy;
  71
  72         cpumask_copy(&cpm, cpu_present_mask);
  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 (!cpumask_test_cpu(0, &cpm)) dim0 = &dummy;
  89         if (!cpumask_test_cpu(1, &cpm)) dim1 = &dummy;
  90         if (!cpumask_test_cpu(2, &cpm)) dim2 = &dummy;
  91         if (!cpumask_test_cpu(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(struct irq_data *d)
 117 {
 118         unsigned int irq = d->irq;
 119         spin_lock(&titan_irq_lock);
 120         titan_cached_irq_mask |= 1UL << (irq - 16);
 121         titan_update_irq_hw(titan_cached_irq_mask);
 122         spin_unlock(&titan_irq_lock);
 123 }
 124
 125 static inline void
 126 titan_disable_irq(struct irq_data *d)
 127 {
 128         unsigned int irq = d->irq;
 129         spin_lock(&titan_irq_lock);
 130         titan_cached_irq_mask &= ~(1UL << (irq - 16));
 131         titan_update_irq_hw(titan_cached_irq_mask);
 132         spin_unlock(&titan_irq_lock);
 133 }
 134
 135 static void
 136 titan_cpu_set_irq_affinity(unsigned int irq, cpumask_t affinity)
 137 {
 138         int cpu;
 139
 140         for (cpu = 0; cpu < 4; cpu++) {
 141                 if (cpumask_test_cpu(cpu, &affinity))
 142                         titan_cpu_irq_affinity[cpu] |= 1UL << irq;
 143                 else
 144                         titan_cpu_irq_affinity[cpu] &= ~(1UL << irq);
 145         }
 146
 147 }
 148
 149 static int
 150 titan_set_irq_affinity(struct irq_data *d, const struct cpumask *affinity,
 151                        bool force)
 152 {
 153         unsigned int irq = d->irq;
 154         spin_lock(&titan_irq_lock);
 155         titan_cpu_set_irq_affinity(irq - 16, *affinity);
 156         titan_update_irq_hw(titan_cached_irq_mask);
 157         spin_unlock(&titan_irq_lock);
 158
 159         return 0;
 160 }
 161
 162 static void
 163 titan_device_interrupt(unsigned long vector)
 164 {
 165         printk("titan_device_interrupt: NOT IMPLEMENTED YET!!\n");
 166 }
 167
 168 static void
 169 titan_srm_device_interrupt(unsigned long vector)
 170 {
 171         int irq;
 172
 173         irq = (vector - 0x800) >> 4;
 174         handle_irq(irq);
 175 }
 176
 177
 178 static void __init
 179 init_titan_irqs(struct irq_chip * ops, int imin, int imax)
 180 {
 181         long i;
 182         for (i = imin; i <= imax; ++i) {
 183                 irq_set_chip_and_handler(i, ops, handle_level_irq);
 184                 irq_set_status_flags(i, IRQ_LEVEL);
 185         }
 186 }
 187
 188 static struct irq_chip titan_irq_type = {
 189        .name                    = "TITAN",
 190        .irq_unmask              = titan_enable_irq,
 191        .irq_mask                = titan_disable_irq,
 192        .irq_mask_ack            = titan_disable_irq,
 193        .irq_set_affinity        = titan_set_irq_affinity,
 194 };
 195
 196 static irqreturn_t
 197 titan_intr_nop(int irq, void *dev_id)
 198 {
 199       /*
 200        * This is a NOP interrupt handler for the purposes of
 201        * event counting -- just return.
 202        */
 203        return IRQ_HANDLED;
 204 }
 205
 206 static void __init
 207 titan_init_irq(void)
 208 {
 209         if (alpha_using_srm && !alpha_mv.device_interrupt)
 210                 alpha_mv.device_interrupt = titan_srm_device_interrupt;
 211         if (!alpha_mv.device_interrupt)
 212                 alpha_mv.device_interrupt = titan_device_interrupt;
 213
 214         titan_update_irq_hw(0);
 215
 216         init_titan_irqs(&titan_irq_type, 16, 63 + 16);
 217 }
 218
 219 static void __init
 220 titan_legacy_init_irq(void)
 221 {
 222         /* init the legacy dma controller */
 223         outb(0, DMA1_RESET_REG);
 224         outb(0, DMA2_RESET_REG);
 225         outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
 226         outb(0, DMA2_MASK_REG);
 227
 228         /* init the legacy irq controller */
 229         init_i8259a_irqs();
 230
 231         /* init the titan irqs */
 232         titan_init_irq();
 233 }
 234
 235 void
 236 titan_dispatch_irqs(u64 mask)
 237 {
 238         unsigned long vector;
 239
 240         /*
 241          * Mask down to those interrupts which are enable on this processor
 242          */
 243         mask &= titan_cpu_irq_affinity[smp_processor_id()];
 244
 245         /*
 246          * Dispatch all requested interrupts
 247          */
 248         while (mask) {
 249                 /* convert to SRM vector... priority is <63> -> <0> */
 250                 vector = 63 - __kernel_ctlz(mask);
 251                 mask &= ~(1UL << vector);       /* clear it out          */
 252                 vector = 0x900 + (vector << 4); /* convert to SRM vector */
 253
 254                 /* dispatch it */
 255                 alpha_mv.device_interrupt(vector);
 256         }
 257 }
 258
 259 \f
 260 /*
 261  * Titan Family
 262  */
 263 static void __init
 264 titan_request_irq(unsigned int irq, irq_handler_t handler,
 265                   unsigned long irqflags, const char *devname,
 266                   void *dev_id)
 267 {
 268         int err;
 269         err = request_irq(irq, handler, irqflags, devname, dev_id);
 270         if (err) {
 271                 printk("titan_request_irq for IRQ %d returned %d; ignoring\n",
 272                        irq, err);
 273         }
 274 }
 275
 276 static void __init
 277 titan_late_init(void)
 278 {
 279         /*
 280          * Enable the system error interrupts. These interrupts are
 281          * all reported to the kernel as machine checks, so the handler
 282          * is a nop so it can be called to count the individual events.
 283          */
 284         titan_request_irq(63+16, titan_intr_nop, 0,
 285                     "CChip Error", NULL);
 286         titan_request_irq(62+16, titan_intr_nop, 0,
 287                     "PChip 0 H_Error", NULL);
 288         titan_request_irq(61+16, titan_intr_nop, 0,
 289                     "PChip 1 H_Error", NULL);
 290         titan_request_irq(60+16, titan_intr_nop, 0,
 291                     "PChip 0 C_Error", NULL);
 292         titan_request_irq(59+16, titan_intr_nop, 0,
 293                     "PChip 1 C_Error", NULL);
 294
 295         /*
 296          * Register our error handlers.
 297          */
 298         titan_register_error_handlers();
 299
 300         /*
 301          * Check if the console left us any error logs.
 302          */
 303         cdl_check_console_data_log();
 304
 305 }
 306
 307 static int
 308 titan_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 309 {
 310         u8 intline;
 311         int irq;
 312
 313         /* Get the current intline.  */
 314         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
 315         irq = intline;
 316
 317         /* Is it explicitly routed through ISA?  */
 318         if ((irq & 0xF0) == 0xE0)
 319                 return irq;
 320
 321         /* Offset by 16 to make room for ISA interrupts 0 - 15.  */
 322         return irq + 16;
 323 }
 324
 325 static void __init
 326 titan_init_pci(void)
 327 {
 328         /*
 329          * This isn't really the right place, but there's some init
 330          * that needs to be done after everything is basically up.
 331          */
 332         titan_late_init();
 333
 334         /* Indicate that we trust the console to configure things properly */
 335         pci_set_flags(PCI_PROBE_ONLY);
 336         common_init_pci();
 337         SMC669_Init(0);
 338         locate_and_init_vga(NULL);
 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         titan_request_irq(53+16, titan_intr_nop, 0,
 353                     "NMI", NULL);
 354         titan_request_irq(50+16, titan_intr_nop, 0,
 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. */