arch/alpha/kernel/sys_sx164.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      linux/arch/alpha/kernel/sys_sx164.c
   4  *
   5  *      Copyright (C) 1995 David A Rusling
   6  *      Copyright (C) 1996 Jay A Estabrook
   7  *      Copyright (C) 1998, 1999, 2000 Richard Henderson
   8  *
   9  * Code supporting the SX164 (PCA56+PYXIS).
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/mm.h>
  15 #include <linux/sched.h>
  16 #include <linux/pci.h>
  17 #include <linux/init.h>
  18 #include <linux/bitops.h>
  19
  20 #include <asm/ptrace.h>
  21 #include <asm/dma.h>
  22 #include <asm/irq.h>
  23 #include <asm/mmu_context.h>
  24 #include <asm/io.h>
  25 #include <asm/core_cia.h>
  26 #include <asm/hwrpb.h>
  27 #include <asm/tlbflush.h>
  28 #include <asm/special_insns.h>
  29
  30 #include "proto.h"
  31 #include "irq_impl.h"
  32 #include "pci_impl.h"
  33 #include "machvec_impl.h"
  34
  35
  36 static void __init
  37 sx164_init_irq(void)
  38 {
  39         outb(0, DMA1_RESET_REG);
  40         outb(0, DMA2_RESET_REG);
  41         outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
  42         outb(0, DMA2_MASK_REG);
  43
  44         if (alpha_using_srm)
  45                 alpha_mv.device_interrupt = srm_device_interrupt;
  46
  47         init_i8259a_irqs();
  48
  49         /* Not interested in the bogus interrupts (0,3,4,5,40-47),
  50            NMI (1), or HALT (2).  */
  51         if (alpha_using_srm)
  52                 init_srm_irqs(40, 0x3f0000);
  53         else
  54                 init_pyxis_irqs(0xff00003f0000UL);
  55
  56         if (request_irq(16 + 6, no_action, 0, "timer-cascade", NULL))
  57                 pr_err("Failed to register timer-cascade interrupt\n");
  58 }
  59
  60 /*
  61  * PCI Fixup configuration.
  62  *
  63  * Summary @ PYXIS_INT_REQ:
  64  * Bit      Meaning
  65  * 0        RSVD
  66  * 1        NMI
  67  * 2        Halt/Reset switch
  68  * 3        MBZ
  69  * 4        RAZ
  70  * 5        RAZ
  71  * 6        Interval timer (RTC)
  72  * 7        PCI-ISA Bridge
  73  * 8        Interrupt Line A from slot 3
  74  * 9        Interrupt Line A from slot 2
  75  *10        Interrupt Line A from slot 1
  76  *11        Interrupt Line A from slot 0
  77  *12        Interrupt Line B from slot 3
  78  *13        Interrupt Line B from slot 2
  79  *14        Interrupt Line B from slot 1
  80  *15        Interrupt line B from slot 0
  81  *16        Interrupt Line C from slot 3
  82  *17        Interrupt Line C from slot 2
  83  *18        Interrupt Line C from slot 1
  84  *19        Interrupt Line C from slot 0
  85  *20        Interrupt Line D from slot 3
  86  *21        Interrupt Line D from slot 2
  87  *22        Interrupt Line D from slot 1
  88  *23        Interrupt Line D from slot 0
  89  *
  90  * IdSel
  91  *   5  32 bit PCI option slot 2
  92  *   6  64 bit PCI option slot 0
  93  *   7  64 bit PCI option slot 1
  94  *   8  Cypress I/O
  95  *   9  32 bit PCI option slot 3
  96  */
  97
  98 static int
  99 sx164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 100 {
 101         static char irq_tab[5][5] = {
 102                 /*INT    INTA   INTB   INTC   INTD */
 103                 { 16+ 9, 16+ 9, 16+13, 16+17, 16+21}, /* IdSel 5 slot 2 J17 */
 104                 { 16+11, 16+11, 16+15, 16+19, 16+23}, /* IdSel 6 slot 0 J19 */
 105                 { 16+10, 16+10, 16+14, 16+18, 16+22}, /* IdSel 7 slot 1 J18 */
 106                 {    -1,    -1,    -1,    -1,    -1}, /* IdSel 8 SIO        */
 107                 { 16+ 8, 16+ 8, 16+12, 16+16, 16+20}  /* IdSel 9 slot 3 J15 */
 108         };
 109         const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
 110         return COMMON_TABLE_LOOKUP;
 111 }
 112
 113 static void __init
 114 sx164_init_pci(void)
 115 {
 116         cia_init_pci();
 117         SMC669_Init(0);
 118 }
 119
 120 static void __init
 121 sx164_init_arch(void)
 122 {
 123         /*
 124          * OSF palcode v1.23 forgets to enable PCA56 Motion Video
 125          * Instructions. Let's enable it.
 126          * We have to check palcode revision because CSERVE interface
 127          * is subject to change without notice. For example, it
 128          * has been changed completely since v1.16 (found in MILO
 129          * distribution). -ink
 130          */
 131         struct percpu_struct *cpu = (struct percpu_struct*)
 132                 ((char*)hwrpb + hwrpb->processor_offset);
 133
 134         if (amask(AMASK_MAX) != 0
 135             && alpha_using_srm
 136             && (cpu->pal_revision & 0xffff) <= 0x117) {
 137                 __asm__ __volatile__(
 138                 "lda    $16,8($31)\n"
 139                 "call_pal 9\n"          /* Allow PALRES insns in kernel mode */
 140                 ".long  0x64000118\n\n" /* hw_mfpr $0,icsr */
 141                 "ldah   $16,(1<<(19-16))($31)\n"
 142                 "or     $0,$16,$0\n"    /* set MVE bit */
 143                 ".long  0x74000118\n"   /* hw_mtpr $0,icsr */
 144                 "lda    $16,9($31)\n"
 145                 "call_pal 9"            /* Disable PALRES insns */
 146                 : : : "$0", "$16");
 147                 printk("PCA56 MVI set enabled\n");
 148         }
 149
 150         pyxis_init_arch();
 151 }
 152
 153 /*
 154  * The System Vector
 155  */
 156
 157 struct alpha_machine_vector sx164_mv __initmv = {
 158         .vector_name            = "SX164",
 159         DO_EV5_MMU,
 160         DO_DEFAULT_RTC,
 161         DO_PYXIS_IO,
 162         .machine_check          = cia_machine_check,
 163         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 164         .min_io_address         = DEFAULT_IO_BASE,
 165         .min_mem_address        = DEFAULT_MEM_BASE,
 166         .pci_dac_offset         = PYXIS_DAC_OFFSET,
 167
 168         .nr_irqs                = 48,
 169         .device_interrupt       = pyxis_device_interrupt,
 170
 171         .init_arch              = sx164_init_arch,
 172         .init_irq               = sx164_init_irq,
 173         .init_rtc               = common_init_rtc,
 174         .init_pci               = sx164_init_pci,
 175         .kill_arch              = cia_kill_arch,
 176         .pci_map_irq            = sx164_map_irq,
 177         .pci_swizzle            = common_swizzle,
 178 };
 179 ALIAS_MV(sx164)