arch/alpha/kernel/sys_nautilus.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      linux/arch/alpha/kernel/sys_nautilus.c
   4  *
   5  *      Copyright (C) 1995 David A Rusling
   6  *      Copyright (C) 1998 Richard Henderson
   7  *      Copyright (C) 1999 Alpha Processor, Inc.,
   8  *              (David Daniel, Stig Telfer, Soohoon Lee)
   9  *
  10  * Code supporting NAUTILUS systems.
  11  *
  12  *
  13  * NAUTILUS has the following I/O features:
  14  *
  15  * a) Driven by AMD 751 aka IRONGATE (northbridge):
  16  *     4 PCI slots
  17  *     1 AGP slot
  18  *
  19  * b) Driven by ALI M1543C (southbridge)
  20  *     2 ISA slots
  21  *     2 IDE connectors
  22  *     1 dual drive capable FDD controller
  23  *     2 serial ports
  24  *     1 ECP/EPP/SP parallel port
  25  *     2 USB ports
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/types.h>
  30 #include <linux/mm.h>
  31 #include <linux/sched.h>
  32 #include <linux/pci.h>
  33 #include <linux/init.h>
  34 #include <linux/reboot.h>
  35 #include <linux/memblock.h>
  36 #include <linux/bitops.h>
  37
  38 #include <asm/ptrace.h>
  39 #include <asm/dma.h>
  40 #include <asm/irq.h>
  41 #include <asm/mmu_context.h>
  42 #include <asm/io.h>
  43 #include <asm/core_irongate.h>
  44 #include <asm/hwrpb.h>
  45 #include <asm/tlbflush.h>
  46
  47 #include "proto.h"
  48 #include "err_impl.h"
  49 #include "irq_impl.h"
  50 #include "pci_impl.h"
  51 #include "machvec_impl.h"
  52
  53
  54 static void __init
  55 nautilus_init_irq(void)
  56 {
  57         if (alpha_using_srm) {
  58                 alpha_mv.device_interrupt = srm_device_interrupt;
  59         }
  60
  61         init_i8259a_irqs();
  62         common_init_isa_dma();
  63 }
  64
  65 static int
  66 nautilus_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  67 {
  68         /* Preserve the IRQ set up by the console.  */
  69
  70         u8 irq;
  71         /* UP1500: AGP INTA is actually routed to IRQ 5, not IRQ 10 as
  72            console reports. Check the device id of AGP bridge to distinguish
  73            UP1500 from UP1000/1100. Note: 'pin' is 2 due to bridge swizzle. */
  74         if (slot == 1 && pin == 2 &&
  75             dev->bus->self && dev->bus->self->device == 0x700f)
  76                 return 5;
  77         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
  78         return irq;
  79 }
  80
  81 static void
  82 nautilus_kill_arch(int mode)
  83 {
  84         struct pci_bus *bus = pci_isa_hose->bus;
  85         u32 pmuport;
  86         int off;
  87
  88         switch (mode) {
  89         case LINUX_REBOOT_CMD_RESTART:
  90                 if (! alpha_using_srm) {
  91                         u8 t8;
  92                         pci_bus_read_config_byte(bus, 0x38, 0x43, &t8);
  93                         pci_bus_write_config_byte(bus, 0x38, 0x43, t8 | 0x80);
  94                         outb(1, 0x92);
  95                         outb(0, 0x92);
  96                         /* NOTREACHED */
  97                 }
  98                 break;
  99
 100         case LINUX_REBOOT_CMD_POWER_OFF:
 101                 /* Assume M1543C */
 102                 off = 0x2000;           /* SLP_TYPE = 0, SLP_EN = 1 */
 103                 pci_bus_read_config_dword(bus, 0x88, 0x10, &pmuport);
 104                 if (!pmuport) {
 105                         /* M1535D/D+ */
 106                         off = 0x3400;   /* SLP_TYPE = 5, SLP_EN = 1 */
 107                         pci_bus_read_config_dword(bus, 0x88, 0xe0, &pmuport);
 108                 }
 109                 pmuport &= 0xfffe;
 110                 outw(0xffff, pmuport);  /* Clear pending events. */
 111                 outw(off, pmuport + 4);
 112                 /* NOTREACHED */
 113                 break;
 114         }
 115 }
 116
 117 /* Perform analysis of a machine check that arrived from the system (NMI) */
 118
 119 static void
 120 naut_sys_machine_check(unsigned long vector, unsigned long la_ptr,
 121                        struct pt_regs *regs)
 122 {
 123         printk("PC %lx RA %lx\n", regs->pc, regs->r26);
 124         irongate_pci_clr_err();
 125 }
 126
 127 /* Machine checks can come from two sources - those on the CPU and those
 128    in the system.  They are analysed separately but all starts here.  */
 129
 130 static void
 131 nautilus_machine_check(unsigned long vector, unsigned long la_ptr)
 132 {
 133         char *mchk_class;
 134
 135         /* Now for some analysis.  Machine checks fall into two classes --
 136            those picked up by the system, and those picked up by the CPU.
 137            Add to that the two levels of severity - correctable or not.  */
 138
 139         if (vector == SCB_Q_SYSMCHK
 140             && ((IRONGATE0->dramms & 0x300) == 0x300)) {
 141                 unsigned long nmi_ctl;
 142
 143                 /* Clear ALI NMI */
 144                 nmi_ctl = inb(0x61);
 145                 nmi_ctl |= 0x0c;
 146                 outb(nmi_ctl, 0x61);
 147                 nmi_ctl &= ~0x0c;
 148                 outb(nmi_ctl, 0x61);
 149
 150                 /* Write again clears error bits.  */
 151                 IRONGATE0->stat_cmd = IRONGATE0->stat_cmd & ~0x100;
 152                 mb();
 153                 IRONGATE0->stat_cmd;
 154
 155                 /* Write again clears error bits.  */
 156                 IRONGATE0->dramms = IRONGATE0->dramms;
 157                 mb();
 158                 IRONGATE0->dramms;
 159
 160                 draina();
 161                 wrmces(0x7);
 162                 mb();
 163                 return;
 164         }
 165
 166         if (vector == SCB_Q_SYSERR)
 167                 mchk_class = "Correctable";
 168         else if (vector == SCB_Q_SYSMCHK)
 169                 mchk_class = "Fatal";
 170         else {
 171                 ev6_machine_check(vector, la_ptr);
 172                 return;
 173         }
 174
 175         printk(KERN_CRIT "NAUTILUS Machine check 0x%lx "
 176                          "[%s System Machine Check (NMI)]\n",
 177                vector, mchk_class);
 178
 179         naut_sys_machine_check(vector, la_ptr, get_irq_regs());
 180
 181         /* Tell the PALcode to clear the machine check */
 182         draina();
 183         wrmces(0x7);
 184         mb();
 185 }
 186
 187 static struct resource irongate_mem = {
 188         .name   = "Irongate PCI MEM",
 189         .flags  = IORESOURCE_MEM,
 190 };
 191 static struct resource busn_resource = {
 192         .name   = "PCI busn",
 193         .start  = 0,
 194         .end    = 255,
 195         .flags  = IORESOURCE_BUS,
 196 };
 197
 198 static void __init
 199 nautilus_init_pci(void)
 200 {
 201         struct pci_controller *hose = hose_head;
 202         struct pci_host_bridge *bridge;
 203         struct pci_bus *bus;
 204         unsigned long bus_align, bus_size, pci_mem;
 205         unsigned long memtop = max_low_pfn << PAGE_SHIFT;
 206
 207         bridge = pci_alloc_host_bridge(0);
 208         if (!bridge)
 209                 return;
 210
 211         /* Use default IO. */
 212         pci_add_resource(&bridge->windows, &ioport_resource);
 213         /* Irongate PCI memory aperture, calculate required size before
 214            setting it up. */
 215         pci_add_resource(&bridge->windows, &irongate_mem);
 216
 217         pci_add_resource(&bridge->windows, &busn_resource);
 218         bridge->dev.parent = NULL;
 219         bridge->sysdata = hose;
 220         bridge->busnr = 0;
 221         bridge->ops = alpha_mv.pci_ops;
 222         bridge->swizzle_irq = alpha_mv.pci_swizzle;
 223         bridge->map_irq = alpha_mv.pci_map_irq;
 224         bridge->size_windows = 1;
 225
 226         /* Scan our single hose.  */
 227         if (pci_scan_root_bus_bridge(bridge)) {
 228                 pci_free_host_bridge(bridge);
 229                 return;
 230         }
 231         bus = hose->bus = bridge->bus;
 232         pcibios_claim_one_bus(bus);
 233
 234         pci_bus_size_bridges(bus);
 235
 236         /* Now we've got the size and alignment of PCI memory resources
 237            stored in irongate_mem. Set up the PCI memory range: limit is
 238            hardwired to 0xffffffff, base must be aligned to 16Mb. */
 239         bus_align = irongate_mem.start;
 240         bus_size = irongate_mem.end + 1 - bus_align;
 241         if (bus_align < 0x1000000UL)
 242                 bus_align = 0x1000000UL;
 243
 244         pci_mem = (0x100000000UL - bus_size) & -bus_align;
 245         irongate_mem.start = pci_mem;
 246         irongate_mem.end = 0xffffffffUL;
 247
 248         /* Register our newly calculated PCI memory window in the resource
 249            tree. */
 250         if (request_resource(&iomem_resource, &irongate_mem) < 0)
 251                 printk(KERN_ERR "Failed to request MEM on hose 0\n");
 252
 253         printk(KERN_INFO "Irongate pci_mem %pR\n", &irongate_mem);
 254
 255         if (pci_mem < memtop)
 256                 memtop = pci_mem;
 257         if (memtop > alpha_mv.min_mem_address) {
 258                 free_reserved_area(__va(alpha_mv.min_mem_address),
 259                                    __va(memtop), -1, NULL);
 260                 printk(KERN_INFO "nautilus_init_pci: %ldk freed\n",
 261                         (memtop - alpha_mv.min_mem_address) >> 10);
 262         }
 263         if ((IRONGATE0->dev_vendor >> 16) > 0x7006)     /* Albacore? */
 264                 IRONGATE0->pci_mem = pci_mem;
 265
 266         pci_bus_assign_resources(bus);
 267         pci_bus_add_devices(bus);
 268 }
 269
 270 /*
 271  * The System Vectors
 272  */
 273
 274 struct alpha_machine_vector nautilus_mv __initmv = {
 275         .vector_name            = "Nautilus",
 276         DO_EV6_MMU,
 277         DO_DEFAULT_RTC,
 278         DO_IRONGATE_IO,
 279         .machine_check          = nautilus_machine_check,
 280         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 281         .min_io_address         = DEFAULT_IO_BASE,
 282         .min_mem_address        = IRONGATE_DEFAULT_MEM_BASE,
 283
 284         .nr_irqs                = 16,
 285         .device_interrupt       = isa_device_interrupt,
 286
 287         .init_arch              = irongate_init_arch,
 288         .init_irq               = nautilus_init_irq,
 289         .init_rtc               = common_init_rtc,
 290         .init_pci               = nautilus_init_pci,
 291         .kill_arch              = nautilus_kill_arch,
 292         .pci_map_irq            = nautilus_map_irq,
 293         .pci_swizzle            = common_swizzle,
 294 };
 295 ALIAS_MV(nautilus)