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/bootmem.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/pgtable.h> 44 #include <asm/core_irongate.h> 45 #include <asm/hwrpb.h> 46 #include <asm/tlbflush.h> 47 48 #include "proto.h" 49 #include "err_impl.h" 50 #include "irq_impl.h" 51 #include "pci_impl.h" 52 #include "machvec_impl.h" 53 54 55 static void __init 56 nautilus_init_irq(void) 57 { 58 if (alpha_using_srm) { 59 alpha_mv.device_interrupt = srm_device_interrupt; 60 } 61 62 init_i8259a_irqs(); 63 common_init_isa_dma(); 64 } 65 66 static int 67 nautilus_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 68 { 69 /* Preserve the IRQ set up by the console. */ 70 71 u8 irq; 72 /* UP1500: AGP INTA is actually routed to IRQ 5, not IRQ 10 as 73 console reports. Check the device id of AGP bridge to distinguish 74 UP1500 from UP1000/1100. Note: 'pin' is 2 due to bridge swizzle. */ 75 if (slot == 1 && pin == 2 && 76 dev->bus->self && dev->bus->self->device == 0x700f) 77 return 5; 78 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); 79 return irq; 80 } 81 82 void 83 nautilus_kill_arch(int mode) 84 { 85 struct pci_bus *bus = pci_isa_hose->bus; 86 u32 pmuport; 87 int off; 88 89 switch (mode) { 90 case LINUX_REBOOT_CMD_RESTART: 91 if (! alpha_using_srm) { 92 u8 t8; 93 pci_bus_read_config_byte(bus, 0x38, 0x43, &t8); 94 pci_bus_write_config_byte(bus, 0x38, 0x43, t8 | 0x80); 95 outb(1, 0x92); 96 outb(0, 0x92); 97 /* NOTREACHED */ 98 } 99 break; 100 101 case LINUX_REBOOT_CMD_POWER_OFF: 102 /* Assume M1543C */ 103 off = 0x2000; /* SLP_TYPE = 0, SLP_EN = 1 */ 104 pci_bus_read_config_dword(bus, 0x88, 0x10, &pmuport); 105 if (!pmuport) { 106 /* M1535D/D+ */ 107 off = 0x3400; /* SLP_TYPE = 5, SLP_EN = 1 */ 108 pci_bus_read_config_dword(bus, 0x88, 0xe0, &pmuport); 109 } 110 pmuport &= 0xfffe; 111 outw(0xffff, pmuport); /* Clear pending events. */ 112 outw(off, pmuport + 4); 113 /* NOTREACHED */ 114 break; 115 } 116 } 117 118 /* Perform analysis of a machine check that arrived from the system (NMI) */ 119 120 static void 121 naut_sys_machine_check(unsigned long vector, unsigned long la_ptr, 122 struct pt_regs *regs) 123 { 124 printk("PC %lx RA %lx\n", regs->pc, regs->r26); 125 irongate_pci_clr_err(); 126 } 127 128 /* Machine checks can come from two sources - those on the CPU and those 129 in the system. They are analysed separately but all starts here. */ 130 131 void 132 nautilus_machine_check(unsigned long vector, unsigned long la_ptr) 133 { 134 char *mchk_class; 135 136 /* Now for some analysis. Machine checks fall into two classes -- 137 those picked up by the system, and those picked up by the CPU. 138 Add to that the two levels of severity - correctable or not. */ 139 140 if (vector == SCB_Q_SYSMCHK 141 && ((IRONGATE0->dramms & 0x300) == 0x300)) { 142 unsigned long nmi_ctl; 143 144 /* Clear ALI NMI */ 145 nmi_ctl = inb(0x61); 146 nmi_ctl |= 0x0c; 147 outb(nmi_ctl, 0x61); 148 nmi_ctl &= ~0x0c; 149 outb(nmi_ctl, 0x61); 150 151 /* Write again clears error bits. */ 152 IRONGATE0->stat_cmd = IRONGATE0->stat_cmd & ~0x100; 153 mb(); 154 IRONGATE0->stat_cmd; 155 156 /* Write again clears error bits. */ 157 IRONGATE0->dramms = IRONGATE0->dramms; 158 mb(); 159 IRONGATE0->dramms; 160 161 draina(); 162 wrmces(0x7); 163 mb(); 164 return; 165 } 166 167 if (vector == SCB_Q_SYSERR) 168 mchk_class = "Correctable"; 169 else if (vector == SCB_Q_SYSMCHK) 170 mchk_class = "Fatal"; 171 else { 172 ev6_machine_check(vector, la_ptr); 173 return; 174 } 175 176 printk(KERN_CRIT "NAUTILUS Machine check 0x%lx " 177 "[%s System Machine Check (NMI)]\n", 178 vector, mchk_class); 179 180 naut_sys_machine_check(vector, la_ptr, get_irq_regs()); 181 182 /* Tell the PALcode to clear the machine check */ 183 draina(); 184 wrmces(0x7); 185 mb(); 186 } 187 188 extern void pcibios_claim_one_bus(struct pci_bus *); 189 190 static struct resource irongate_io = { 191 .name = "Irongate PCI IO", 192 .flags = IORESOURCE_IO, 193 }; 194 static struct resource irongate_mem = { 195 .name = "Irongate PCI MEM", 196 .flags = IORESOURCE_MEM, 197 }; 198 static struct resource busn_resource = { 199 .name = "PCI busn", 200 .start = 0, 201 .end = 255, 202 .flags = IORESOURCE_BUS, 203 }; 204 205 void __init 206 nautilus_init_pci(void) 207 { 208 struct pci_controller *hose = hose_head; 209 struct pci_host_bridge *bridge; 210 struct pci_bus *bus; 211 struct pci_dev *irongate; 212 unsigned long bus_align, bus_size, pci_mem; 213 unsigned long memtop = max_low_pfn << PAGE_SHIFT; 214 int ret; 215 216 bridge = pci_alloc_host_bridge(0); 217 if (!bridge) 218 return; 219 220 pci_add_resource(&bridge->windows, &ioport_resource); 221 pci_add_resource(&bridge->windows, &iomem_resource); 222 pci_add_resource(&bridge->windows, &busn_resource); 223 bridge->dev.parent = NULL; 224 bridge->sysdata = hose; 225 bridge->busnr = 0; 226 bridge->ops = alpha_mv.pci_ops; 227 bridge->swizzle_irq = alpha_mv.pci_swizzle; 228 bridge->map_irq = alpha_mv.pci_map_irq; 229 230 /* Scan our single hose. */ 231 ret = pci_scan_root_bus_bridge(bridge); 232 if (ret) { 233 pci_free_host_bridge(bridge); 234 return; 235 } 236 237 bus = hose->bus = bridge->bus; 238 pcibios_claim_one_bus(bus); 239 240 irongate = pci_get_domain_bus_and_slot(pci_domain_nr(bus), 0, 0); 241 bus->self = irongate; 242 bus->resource[0] = &irongate_io; 243 bus->resource[1] = &irongate_mem; 244 245 pci_bus_size_bridges(bus); 246 247 /* IO port range. */ 248 bus->resource[0]->start = 0; 249 bus->resource[0]->end = 0xffff; 250 251 /* Set up PCI memory range - limit is hardwired to 0xffffffff, 252 base must be at aligned to 16Mb. */ 253 bus_align = bus->resource[1]->start; 254 bus_size = bus->resource[1]->end + 1 - bus_align; 255 if (bus_align < 0x1000000UL) 256 bus_align = 0x1000000UL; 257 258 pci_mem = (0x100000000UL - bus_size) & -bus_align; 259 260 bus->resource[1]->start = pci_mem; 261 bus->resource[1]->end = 0xffffffffUL; 262 if (request_resource(&iomem_resource, bus->resource[1]) < 0) 263 printk(KERN_ERR "Failed to request MEM on hose 0\n"); 264 265 if (pci_mem < memtop) 266 memtop = pci_mem; 267 if (memtop > alpha_mv.min_mem_address) { 268 free_reserved_area(__va(alpha_mv.min_mem_address), 269 __va(memtop), -1, NULL); 270 printk("nautilus_init_pci: %ldk freed\n", 271 (memtop - alpha_mv.min_mem_address) >> 10); 272 } 273 274 if ((IRONGATE0->dev_vendor >> 16) > 0x7006) /* Albacore? */ 275 IRONGATE0->pci_mem = pci_mem; 276 277 pci_bus_assign_resources(bus); 278 279 /* pci_common_swizzle() relies on bus->self being NULL 280 for the root bus, so just clear it. */ 281 bus->self = NULL; 282 pci_bus_add_devices(bus); 283 } 284 285 /* 286 * The System Vectors 287 */ 288 289 struct alpha_machine_vector nautilus_mv __initmv = { 290 .vector_name = "Nautilus", 291 DO_EV6_MMU, 292 DO_DEFAULT_RTC, 293 DO_IRONGATE_IO, 294 .machine_check = nautilus_machine_check, 295 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, 296 .min_io_address = DEFAULT_IO_BASE, 297 .min_mem_address = IRONGATE_DEFAULT_MEM_BASE, 298 299 .nr_irqs = 16, 300 .device_interrupt = isa_device_interrupt, 301 302 .init_arch = irongate_init_arch, 303 .init_irq = nautilus_init_irq, 304 .init_rtc = common_init_rtc, 305 .init_pci = nautilus_init_pci, 306 .kill_arch = nautilus_kill_arch, 307 .pci_map_irq = nautilus_map_irq, 308 .pci_swizzle = common_swizzle, 309 }; 310 ALIAS_MV(nautilus) 311