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
54static void __init
55nautilus_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
65static int
66nautilus_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, val: &irq);
78 return irq;
79}
80
81void
82nautilus_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, devfn: 0x38, where: 0x43, val: &t8);
93 pci_bus_write_config_byte(bus, devfn: 0x38, where: 0x43, val: t8 | 0x80);
94 outb(value: 1, port: 0x92);
95 outb(value: 0, port: 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, devfn: 0x88, where: 0x10, val: &pmuport);
104 if (!pmuport) {
105 /* M1535D/D+ */
106 off = 0x3400; /* SLP_TYPE = 5, SLP_EN = 1 */
107 pci_bus_read_config_dword(bus, devfn: 0x88, where: 0xe0, val: &pmuport);
108 }
109 pmuport &= 0xfffe;
110 outw(value: 0xffff, port: pmuport); /* Clear pending events. */
111 outw(value: off, port: pmuport + 4);
112 /* NOTREACHED */
113 break;
114 }
115}
116
117/* Perform analysis of a machine check that arrived from the system (NMI) */
118
119static void
120naut_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
130void
131nautilus_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(port: 0x61);
145 nmi_ctl |= 0x0c;
146 outb(value: nmi_ctl, port: 0x61);
147 nmi_ctl &= ~0x0c;
148 outb(value: nmi_ctl, port: 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(mces: 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, regs: get_irq_regs());
180
181 /* Tell the PALcode to clear the machine check */
182 draina();
183 wrmces(mces: 0x7);
184 mb();
185}
186
187extern void pcibios_claim_one_bus(struct pci_bus *);
188
189static struct resource irongate_mem = {
190 .name = "Irongate PCI MEM",
191 .flags = IORESOURCE_MEM,
192};
193static struct resource busn_resource = {
194 .name = "PCI busn",
195 .start = 0,
196 .end = 255,
197 .flags = IORESOURCE_BUS,
198};
199
200void __init
201nautilus_init_pci(void)
202{
203 struct pci_controller *hose = hose_head;
204 struct pci_host_bridge *bridge;
205 struct pci_bus *bus;
206 unsigned long bus_align, bus_size, pci_mem;
207 unsigned long memtop = max_low_pfn << PAGE_SHIFT;
208
209 bridge = pci_alloc_host_bridge(priv: 0);
210 if (!bridge)
211 return;
212
213 /* Use default IO. */
214 pci_add_resource(resources: &bridge->windows, res: &ioport_resource);
215 /* Irongate PCI memory aperture, calculate required size before
216 setting it up. */
217 pci_add_resource(resources: &bridge->windows, res: &irongate_mem);
218
219 pci_add_resource(resources: &bridge->windows, res: &busn_resource);
220 bridge->dev.parent = NULL;
221 bridge->sysdata = hose;
222 bridge->busnr = 0;
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;
227
228 /* Scan our single hose. */
229 if (pci_scan_root_bus_bridge(bridge)) {
230 pci_free_host_bridge(bridge);
231 return;
232 }
233 bus = hose->bus = bridge->bus;
234 pcibios_claim_one_bus(bus);
235
236 pci_bus_size_bridges(bus);
237
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;
245
246 pci_mem = (0x100000000UL - bus_size) & -bus_align;
247 irongate_mem.start = pci_mem;
248 irongate_mem.end = 0xffffffffUL;
249
250 /* Register our newly calculated PCI memory window in the resource
251 tree. */
252 if (request_resource(root: &iomem_resource, new: &irongate_mem) < 0)
253 printk(KERN_ERR "Failed to request MEM on hose 0\n");
254
255 printk(KERN_INFO "Irongate pci_mem %pR\n", &irongate_mem);
256
257 if (pci_mem < memtop)
258 memtop = pci_mem;
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);
264 }
265 if ((IRONGATE0->dev_vendor >> 16) > 0x7006) /* Albacore? */
266 IRONGATE0->pci_mem = pci_mem;
267
268 pci_bus_assign_resources(bus);
269 pci_bus_add_devices(bus);
270}
271
272/*
273 * The System Vectors
274 */
275
276struct alpha_machine_vector nautilus_mv __initmv = {
277 .vector_name = "Nautilus",
278 DO_EV6_MMU,
279 DO_DEFAULT_RTC,
280 DO_IRONGATE_IO,
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,
285
286 .nr_irqs = 16,
287 .device_interrupt = isa_device_interrupt,
288
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,
296};
297ALIAS_MV(nautilus)
298

source code of linux/arch/alpha/kernel/sys_nautilus.c