1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/alpha/kernel/sys_nautilus.c
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)
10 * Code supporting NAUTILUS systems.
13 * NAUTILUS has the following I/O features:
15 * a) Driven by AMD 751 aka IRONGATE (northbridge):
19 * b) Driven by ALI M1543C (southbridge)
22 * 1 dual drive capable FDD controller
24 * 1 ECP/EPP/SP parallel port
28 #include <linux/kernel.h>
29 #include <linux/types.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>
38 #include <asm/ptrace.h>
41 #include <asm/mmu_context.h>
43 #include <asm/core_irongate.h>
44 #include <asm/hwrpb.h>
45 #include <asm/tlbflush.h>
51 #include "machvec_impl.h"
55 nautilus_init_irq(void)
57 if (alpha_using_srm) {
58 alpha_mv.device_interrupt = srm_device_interrupt;
62 common_init_isa_dma();
66 nautilus_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
68 /* Preserve the IRQ set up by the console. */
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)
77 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
82 nautilus_kill_arch(int mode)
84 struct pci_bus *bus = pci_isa_hose->bus;
89 case LINUX_REBOOT_CMD_RESTART:
90 if (! alpha_using_srm) {
92 pci_bus_read_config_byte(bus, 0x38, 0x43, &t8);
93 pci_bus_write_config_byte(bus, 0x38, 0x43, t8 | 0x80);
100 case LINUX_REBOOT_CMD_POWER_OFF:
102 off = 0x2000; /* SLP_TYPE = 0, SLP_EN = 1 */
103 pci_bus_read_config_dword(bus, 0x88, 0x10, &pmuport);
106 off = 0x3400; /* SLP_TYPE = 5, SLP_EN = 1 */
107 pci_bus_read_config_dword(bus, 0x88, 0xe0, &pmuport);
110 outw(0xffff, pmuport); /* Clear pending events. */
111 outw(off, pmuport + 4);
117 /* Perform analysis of a machine check that arrived from the system (NMI) */
120 naut_sys_machine_check(unsigned long vector, unsigned long la_ptr,
121 struct pt_regs *regs)
123 printk("PC %lx RA %lx\n", regs->pc, regs->r26);
124 irongate_pci_clr_err();
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. */
131 nautilus_machine_check(unsigned long vector, unsigned long la_ptr)
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. */
139 if (vector == SCB_Q_SYSMCHK
140 && ((IRONGATE0->dramms & 0x300) == 0x300)) {
141 unsigned long nmi_ctl;
150 /* Write again clears error bits. */
151 IRONGATE0->stat_cmd = IRONGATE0->stat_cmd & ~0x100;
155 /* Write again clears error bits. */
156 IRONGATE0->dramms = IRONGATE0->dramms;
166 if (vector == SCB_Q_SYSERR)
167 mchk_class = "Correctable";
168 else if (vector == SCB_Q_SYSMCHK)
169 mchk_class = "Fatal";
171 ev6_machine_check(vector, la_ptr);
175 printk(KERN_CRIT "NAUTILUS Machine check 0x%lx "
176 "[%s System Machine Check (NMI)]\n",
179 naut_sys_machine_check(vector, la_ptr, get_irq_regs());
181 /* Tell the PALcode to clear the machine check */
187 extern void pcibios_claim_one_bus(struct pci_bus *);
189 static struct resource irongate_mem = {
190 .name = "Irongate PCI MEM",
191 .flags = IORESOURCE_MEM,
193 static struct resource busn_resource = {
197 .flags = IORESOURCE_BUS,
201 nautilus_init_pci(void)
203 struct pci_controller *hose = hose_head;
204 struct pci_host_bridge *bridge;
206 unsigned long bus_align, bus_size, pci_mem;
207 unsigned long memtop = max_low_pfn << PAGE_SHIFT;
209 bridge = pci_alloc_host_bridge(0);
213 /* Use default IO. */
214 pci_add_resource(&bridge->windows, &ioport_resource);
215 /* Irongate PCI memory aperture, calculate required size before
217 pci_add_resource(&bridge->windows, &irongate_mem);
219 pci_add_resource(&bridge->windows, &busn_resource);
220 bridge->dev.parent = NULL;
221 bridge->sysdata = hose;
223 bridge->ops = alpha_mv.pci_ops;
224 bridge->swizzle_irq = alpha_mv.pci_swizzle;
225 bridge->map_irq = alpha_mv.pci_map_irq;
226 bridge->size_windows = 1;
228 /* Scan our single hose. */
229 if (pci_scan_root_bus_bridge(bridge)) {
230 pci_free_host_bridge(bridge);
233 bus = hose->bus = bridge->bus;
234 pcibios_claim_one_bus(bus);
236 pci_bus_size_bridges(bus);
238 /* Now we've got the size and alignment of PCI memory resources
239 stored in irongate_mem. Set up the PCI memory range: limit is
240 hardwired to 0xffffffff, base must be aligned to 16Mb. */
241 bus_align = irongate_mem.start;
242 bus_size = irongate_mem.end + 1 - bus_align;
243 if (bus_align < 0x1000000UL)
244 bus_align = 0x1000000UL;
246 pci_mem = (0x100000000UL - bus_size) & -bus_align;
247 irongate_mem.start = pci_mem;
248 irongate_mem.end = 0xffffffffUL;
250 /* Register our newly calculated PCI memory window in the resource
252 if (request_resource(&iomem_resource, &irongate_mem) < 0)
253 printk(KERN_ERR "Failed to request MEM on hose 0\n");
255 printk(KERN_INFO "Irongate pci_mem %pR\n", &irongate_mem);
257 if (pci_mem < memtop)
259 if (memtop > alpha_mv.min_mem_address) {
260 free_reserved_area(__va(alpha_mv.min_mem_address),
261 __va(memtop), -1, NULL);
262 printk(KERN_INFO "nautilus_init_pci: %ldk freed\n",
263 (memtop - alpha_mv.min_mem_address) >> 10);
265 if ((IRONGATE0->dev_vendor >> 16) > 0x7006) /* Albacore? */
266 IRONGATE0->pci_mem = pci_mem;
268 pci_bus_assign_resources(bus);
269 pci_bus_add_devices(bus);
276 struct alpha_machine_vector nautilus_mv __initmv = {
277 .vector_name = "Nautilus",
281 .machine_check = nautilus_machine_check,
282 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
283 .min_io_address = DEFAULT_IO_BASE,
284 .min_mem_address = IRONGATE_DEFAULT_MEM_BASE,
287 .device_interrupt = isa_device_interrupt,
289 .init_arch = irongate_init_arch,
290 .init_irq = nautilus_init_irq,
291 .init_rtc = common_init_rtc,
292 .init_pci = nautilus_init_pci,
293 .kill_arch = nautilus_kill_arch,
294 .pci_map_irq = nautilus_map_irq,
295 .pci_swizzle = common_swizzle,