release/src-rt-6.x.4708/linux/linux-2.6.36/arch/alpha/kernel/sys_ruffian.c

   1 /*
   2  *      linux/arch/alpha/kernel/sys_ruffian.c
   3  *
   4  *      Copyright (C) 1995 David A Rusling
   5  *      Copyright (C) 1996 Jay A Estabrook
   6  *      Copyright (C) 1998, 1999, 2000 Richard Henderson
   7  *
   8  * Code supporting the RUFFIAN.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/mm.h>
  14 #include <linux/sched.h>
  15 #include <linux/pci.h>
  16 #include <linux/ioport.h>
  17 #include <linux/timex.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/ptrace.h>
  21 #include <asm/system.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/pgtable.h>
  27 #include <asm/core_cia.h>
  28 #include <asm/tlbflush.h>
  29 #include <asm/8253pit.h>
  30
  31 #include "proto.h"
  32 #include "irq_impl.h"
  33 #include "pci_impl.h"
  34 #include "machvec_impl.h"
  35
  36
  37 static void __init
  38 ruffian_init_irq(void)
  39 {
  40         /* Invert 6&7 for i82371 */
  41         *(vulp)PYXIS_INT_HILO  = 0x000000c0UL; mb();
  42         *(vulp)PYXIS_INT_CNFG  = 0x00002064UL; mb();     /* all clear */
  43
  44         outb(0x11,0xA0);
  45         outb(0x08,0xA1);
  46         outb(0x02,0xA1);
  47         outb(0x01,0xA1);
  48         outb(0xFF,0xA1);
  49
  50         outb(0x11,0x20);
  51         outb(0x00,0x21);
  52         outb(0x04,0x21);
  53         outb(0x01,0x21);
  54         outb(0xFF,0x21);
  55
  56         /* Finish writing the 82C59A PIC Operation Control Words */
  57         outb(0x20,0xA0);
  58         outb(0x20,0x20);
  59
  60         init_i8259a_irqs();
  61
  62         /* Not interested in the bogus interrupts (0,3,6),
  63            NMI (1), HALT (2), flash (5), or 21142 (8).  */
  64         init_pyxis_irqs(0x16f0000);
  65
  66         common_init_isa_dma();
  67 }
  68
  69 #define RUFFIAN_LATCH   DIV_ROUND_CLOSEST(PIT_TICK_RATE, HZ)
  70
  71 static void __init
  72 ruffian_init_rtc(void)
  73 {
  74         /* Ruffian does not have the RTC connected to the CPU timer
  75            interrupt.  Instead, it uses the PIT connected to IRQ 0.  */
  76
  77         /* Setup interval timer.  */
  78         outb(0x34, 0x43);               /* binary, mode 2, LSB/MSB, ch 0 */
  79         outb(RUFFIAN_LATCH & 0xff, 0x40);       /* LSB */
  80         outb(RUFFIAN_LATCH >> 8, 0x40);         /* MSB */
  81
  82         outb(0xb6, 0x43);               /* pit counter 2: speaker */
  83         outb(0x31, 0x42);
  84         outb(0x13, 0x42);
  85
  86         setup_irq(0, &timer_irqaction);
  87 }
  88
  89 static void
  90 ruffian_kill_arch (int mode)
  91 {
  92         cia_kill_arch(mode);
  93 }
  94
  95 /*
  96  *  Interrupt routing:
  97  *
  98  *              Primary bus
  99  *        IdSel         INTA    INTB    INTC    INTD
 100  * 21052   13             -       -       -       -
 101  * SIO     14            23       -       -       -
 102  * 21143   15            44       -       -       -
 103  * Slot 0  17            43      42      41      40
 104  *
 105  *              Secondary bus
 106  *        IdSel         INTA    INTB    INTC    INTD
 107  * Slot 0   8 (18)       19      18      17      16
 108  * Slot 1   9 (19)       31      30      29      28
 109  * Slot 2  10 (20)       27      26      25      24
 110  * Slot 3  11 (21)       39      38      37      36
 111  * Slot 4  12 (22)       35      34      33      32
 112  * 53c875  13 (23)       20       -       -       -
 113  *
 114  */
 115
 116 static int __init
 117 ruffian_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 118 {
 119         static char irq_tab[11][5] __initdata = {
 120               /*INT  INTA INTB INTC INTD */
 121                 {-1,  -1,  -1,  -1,  -1},  /* IdSel 13,  21052       */
 122                 {-1,  -1,  -1,  -1,  -1},  /* IdSel 14,  SIO         */
 123                 {44,  44,  44,  44,  44},  /* IdSel 15,  21143       */
 124                 {-1,  -1,  -1,  -1,  -1},  /* IdSel 16,  none        */
 125                 {43,  43,  42,  41,  40},  /* IdSel 17,  64-bit slot */
 126                 /* the next 6 are actually on PCI bus 1, across the bridge */
 127                 {19,  19,  18,  17,  16},  /* IdSel  8,  slot 0      */
 128                 {31,  31,  30,  29,  28},  /* IdSel  9,  slot 1      */
 129                 {27,  27,  26,  25,  24},  /* IdSel 10,  slot 2      */
 130                 {39,  39,  38,  37,  36},  /* IdSel 11,  slot 3      */
 131                 {35,  35,  34,  33,  32},  /* IdSel 12,  slot 4      */
 132                 {20,  20,  20,  20,  20},  /* IdSel 13,  53c875      */
 133         };
 134         const long min_idsel = 13, max_idsel = 23, irqs_per_slot = 5;
 135         return COMMON_TABLE_LOOKUP;
 136 }
 137
 138 static u8 __init
 139 ruffian_swizzle(struct pci_dev *dev, u8 *pinp)
 140 {
 141         int slot, pin = *pinp;
 142
 143         if (dev->bus->number == 0) {
 144                 slot = PCI_SLOT(dev->devfn);
 145         }
 146         /* Check for the built-in bridge.  */
 147         else if (PCI_SLOT(dev->bus->self->devfn) == 13) {
 148                 slot = PCI_SLOT(dev->devfn) + 10;
 149         }
 150         else
 151         {
 152                 /* Must be a card-based bridge.  */
 153                 do {
 154                         if (PCI_SLOT(dev->bus->self->devfn) == 13) {
 155                                 slot = PCI_SLOT(dev->devfn) + 10;
 156                                 break;
 157                         }
 158                         pin = pci_swizzle_interrupt_pin(dev, pin);
 159
 160                         /* Move up the chain of bridges.  */
 161                         dev = dev->bus->self;
 162                         /* Slot of the next bridge.  */
 163                         slot = PCI_SLOT(dev->devfn);
 164                 } while (dev->bus->self);
 165         }
 166         *pinp = pin;
 167         return slot;
 168 }
 169
 170 #ifdef BUILDING_FOR_MILO
 171 /*
 172  * The DeskStation Ruffian motherboard firmware does not place
 173  * the memory size in the PALimpure area.  Therefore, we use
 174  * the Bank Configuration Registers in PYXIS to obtain the size.
 175  */
 176 static unsigned long __init
 177 ruffian_get_bank_size(unsigned long offset)
 178 {
 179         unsigned long bank_addr, bank, ret = 0;
 180
 181         /* Valid offsets are: 0x800, 0x840 and 0x880
 182            since Ruffian only uses three banks.  */
 183         bank_addr = (unsigned long)PYXIS_MCR + offset;
 184         bank = *(vulp)bank_addr;
 185
 186         /* Check BANK_ENABLE */
 187         if (bank & 0x01) {
 188                 static unsigned long size[] __initdata = {
 189                         0x40000000UL, /* 0x00,   1G */
 190                         0x20000000UL, /* 0x02, 512M */
 191                         0x10000000UL, /* 0x04, 256M */
 192                         0x08000000UL, /* 0x06, 128M */
 193                         0x04000000UL, /* 0x08,  64M */
 194                         0x02000000UL, /* 0x0a,  32M */
 195                         0x01000000UL, /* 0x0c,  16M */
 196                         0x00800000UL, /* 0x0e,   8M */
 197                         0x80000000UL, /* 0x10,   2G */
 198                 };
 199
 200                 bank = (bank & 0x1e) >> 1;
 201                 if (bank < ARRAY_SIZE(size))
 202                         ret = size[bank];
 203         }
 204
 205         return ret;
 206 }
 207 #endif /* BUILDING_FOR_MILO */
 208
 209 /*
 210  * The System Vector
 211  */
 212
 213 struct alpha_machine_vector ruffian_mv __initmv = {
 214         .vector_name            = "Ruffian",
 215         DO_EV5_MMU,
 216         DO_DEFAULT_RTC,
 217         DO_PYXIS_IO,
 218         .machine_check          = cia_machine_check,
 219         .max_isa_dma_address    = ALPHA_RUFFIAN_MAX_ISA_DMA_ADDRESS,
 220         .min_io_address         = DEFAULT_IO_BASE,
 221         .min_mem_address        = DEFAULT_MEM_BASE,
 222         .pci_dac_offset         = PYXIS_DAC_OFFSET,
 223
 224         .nr_irqs                = 48,
 225         .device_interrupt       = pyxis_device_interrupt,
 226
 227         .init_arch              = pyxis_init_arch,
 228         .init_irq               = ruffian_init_irq,
 229         .init_rtc               = ruffian_init_rtc,
 230         .init_pci               = cia_init_pci,
 231         .kill_arch              = ruffian_kill_arch,
 232         .pci_map_irq            = ruffian_map_irq,
 233         .pci_swizzle            = ruffian_swizzle,
 234 };
 235 ALIAS_MV(ruffian)