arch/alpha/kernel/sys_ruffian.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      linux/arch/alpha/kernel/sys_ruffian.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 RUFFIAN.
  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/ioport.h>
  18 #include <linux/timex.h>
  19 #include <linux/init.h>
  20
  21 #include <asm/ptrace.h>
  22 #include <asm/dma.h>
  23 #include <asm/irq.h>
  24 #include <asm/mmu_context.h>
  25 #include <asm/io.h>
  26 #include <asm/core_cia.h>
  27 #include <asm/tlbflush.h>
  28
  29 #include "proto.h"
  30 #include "irq_impl.h"
  31 #include "pci_impl.h"
  32 #include "machvec_impl.h"
  33
  34
  35 static void __init
  36 ruffian_init_irq(void)
  37 {
  38         /* Invert 6&7 for i82371 */
  39         *(vulp)PYXIS_INT_HILO  = 0x000000c0UL; mb();
  40         *(vulp)PYXIS_INT_CNFG  = 0x00002064UL; mb();     /* all clear */
  41
  42         outb(0x11,0xA0);
  43         outb(0x08,0xA1);
  44         outb(0x02,0xA1);
  45         outb(0x01,0xA1);
  46         outb(0xFF,0xA1);
  47
  48         outb(0x11,0x20);
  49         outb(0x00,0x21);
  50         outb(0x04,0x21);
  51         outb(0x01,0x21);
  52         outb(0xFF,0x21);
  53
  54         /* Finish writing the 82C59A PIC Operation Control Words */
  55         outb(0x20,0xA0);
  56         outb(0x20,0x20);
  57
  58         init_i8259a_irqs();
  59
  60         /* Not interested in the bogus interrupts (0,3,6),
  61            NMI (1), HALT (2), flash (5), or 21142 (8).  */
  62         init_pyxis_irqs(0x16f0000);
  63
  64         common_init_isa_dma();
  65 }
  66
  67 #define RUFFIAN_LATCH   DIV_ROUND_CLOSEST(PIT_TICK_RATE, HZ)
  68
  69 static void __init
  70 ruffian_init_rtc(void)
  71 {
  72         /* Ruffian does not have the RTC connected to the CPU timer
  73            interrupt.  Instead, it uses the PIT connected to IRQ 0.  */
  74
  75         /* Setup interval timer.  */
  76         outb(0x34, 0x43);               /* binary, mode 2, LSB/MSB, ch 0 */
  77         outb(RUFFIAN_LATCH & 0xff, 0x40);       /* LSB */
  78         outb(RUFFIAN_LATCH >> 8, 0x40);         /* MSB */
  79
  80         outb(0xb6, 0x43);               /* pit counter 2: speaker */
  81         outb(0x31, 0x42);
  82         outb(0x13, 0x42);
  83
  84         if (request_irq(0, rtc_timer_interrupt, 0, "timer", NULL))
  85                 pr_err("Failed to request irq 0 (timer)\n");
  86 }
  87
  88 static void
  89 ruffian_kill_arch (int mode)
  90 {
  91         cia_kill_arch(mode);
  92 #if 0
  93         /* This only causes re-entry to ARCSBIOS */
  94         /* Perhaps this works for other PYXIS as well?  */
  95         *(vuip) PYXIS_RESET = 0x0000dead;
  96         mb();
  97 #endif
  98 }
  99
 100 /*
 101  *  Interrupt routing:
 102  *
 103  *              Primary bus
 104  *        IdSel         INTA    INTB    INTC    INTD
 105  * 21052   13             -       -       -       -
 106  * SIO     14            23       -       -       -
 107  * 21143   15            44       -       -       -
 108  * Slot 0  17            43      42      41      40
 109  *
 110  *              Secondary bus
 111  *        IdSel         INTA    INTB    INTC    INTD
 112  * Slot 0   8 (18)       19      18      17      16
 113  * Slot 1   9 (19)       31      30      29      28
 114  * Slot 2  10 (20)       27      26      25      24
 115  * Slot 3  11 (21)       39      38      37      36
 116  * Slot 4  12 (22)       35      34      33      32
 117  * 53c875  13 (23)       20       -       -       -
 118  *
 119  */
 120
 121 static int
 122 ruffian_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 123 {
 124         static char irq_tab[11][5] = {
 125               /*INT  INTA INTB INTC INTD */
 126                 {-1,  -1,  -1,  -1,  -1},  /* IdSel 13,  21052       */
 127                 {-1,  -1,  -1,  -1,  -1},  /* IdSel 14,  SIO         */
 128                 {44,  44,  44,  44,  44},  /* IdSel 15,  21143       */
 129                 {-1,  -1,  -1,  -1,  -1},  /* IdSel 16,  none        */
 130                 {43,  43,  42,  41,  40},  /* IdSel 17,  64-bit slot */
 131                 /* the next 6 are actually on PCI bus 1, across the bridge */
 132                 {19,  19,  18,  17,  16},  /* IdSel  8,  slot 0      */
 133                 {31,  31,  30,  29,  28},  /* IdSel  9,  slot 1      */
 134                 {27,  27,  26,  25,  24},  /* IdSel 10,  slot 2      */
 135                 {39,  39,  38,  37,  36},  /* IdSel 11,  slot 3      */
 136                 {35,  35,  34,  33,  32},  /* IdSel 12,  slot 4      */
 137                 {20,  20,  20,  20,  20},  /* IdSel 13,  53c875      */
 138         };
 139         const long min_idsel = 13, max_idsel = 23, irqs_per_slot = 5;
 140         return COMMON_TABLE_LOOKUP;
 141 }
 142
 143 static u8
 144 ruffian_swizzle(struct pci_dev *dev, u8 *pinp)
 145 {
 146         int slot, pin = *pinp;
 147
 148         if (dev->bus->number == 0) {
 149                 slot = PCI_SLOT(dev->devfn);
 150         }
 151         /* Check for the built-in bridge.  */
 152         else if (PCI_SLOT(dev->bus->self->devfn) == 13) {
 153                 slot = PCI_SLOT(dev->devfn) + 10;
 154         }
 155         else
 156         {
 157                 /* Must be a card-based bridge.  */
 158                 do {
 159                         if (PCI_SLOT(dev->bus->self->devfn) == 13) {
 160                                 slot = PCI_SLOT(dev->devfn) + 10;
 161                                 break;
 162                         }
 163                         pin = pci_swizzle_interrupt_pin(dev, pin);
 164
 165                         /* Move up the chain of bridges.  */
 166                         dev = dev->bus->self;
 167                         /* Slot of the next bridge.  */
 168                         slot = PCI_SLOT(dev->devfn);
 169                 } while (dev->bus->self);
 170         }
 171         *pinp = pin;
 172         return slot;
 173 }
 174
 175 #ifdef BUILDING_FOR_MILO
 176 /*
 177  * The DeskStation Ruffian motherboard firmware does not place
 178  * the memory size in the PALimpure area.  Therefore, we use
 179  * the Bank Configuration Registers in PYXIS to obtain the size.
 180  */
 181 static unsigned long __init
 182 ruffian_get_bank_size(unsigned long offset)
 183 {
 184         unsigned long bank_addr, bank, ret = 0;
 185
 186         /* Valid offsets are: 0x800, 0x840 and 0x880
 187            since Ruffian only uses three banks.  */
 188         bank_addr = (unsigned long)PYXIS_MCR + offset;
 189         bank = *(vulp)bank_addr;
 190
 191         /* Check BANK_ENABLE */
 192         if (bank & 0x01) {
 193                 static unsigned long size[] __initdata = {
 194                         0x40000000UL, /* 0x00,   1G */
 195                         0x20000000UL, /* 0x02, 512M */
 196                         0x10000000UL, /* 0x04, 256M */
 197                         0x08000000UL, /* 0x06, 128M */
 198                         0x04000000UL, /* 0x08,  64M */
 199                         0x02000000UL, /* 0x0a,  32M */
 200                         0x01000000UL, /* 0x0c,  16M */
 201                         0x00800000UL, /* 0x0e,   8M */
 202                         0x80000000UL, /* 0x10,   2G */
 203                 };
 204
 205                 bank = (bank & 0x1e) >> 1;
 206                 if (bank < ARRAY_SIZE(size))
 207                         ret = size[bank];
 208         }
 209
 210         return ret;
 211 }
 212 #endif /* BUILDING_FOR_MILO */
 213
 214 /*
 215  * The System Vector
 216  */
 217
 218 struct alpha_machine_vector ruffian_mv __initmv = {
 219         .vector_name            = "Ruffian",
 220         DO_EV5_MMU,
 221         DO_DEFAULT_RTC,
 222         DO_PYXIS_IO,
 223         .machine_check          = cia_machine_check,
 224         .max_isa_dma_address    = ALPHA_RUFFIAN_MAX_ISA_DMA_ADDRESS,
 225         .min_io_address         = DEFAULT_IO_BASE,
 226         .min_mem_address        = DEFAULT_MEM_BASE,
 227         .pci_dac_offset         = PYXIS_DAC_OFFSET,
 228
 229         .nr_irqs                = 48,
 230         .device_interrupt       = pyxis_device_interrupt,
 231
 232         .init_arch              = pyxis_init_arch,
 233         .init_irq               = ruffian_init_irq,
 234         .init_rtc               = ruffian_init_rtc,
 235         .init_pci               = cia_init_pci,
 236         .kill_arch              = ruffian_kill_arch,
 237         .pci_map_irq            = ruffian_map_irq,
 238         .pci_swizzle            = ruffian_swizzle,
 239 };
 240 ALIAS_MV(ruffian)