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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/alpha/kernel/sys_miata.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 MIATA (EV56+PYXIS).
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/init.h>
17#include <linux/reboot.h>
18
19#include <asm/ptrace.h>
20#include <asm/system.h>
21#include <asm/dma.h>
22#include <asm/irq.h>
23#include <asm/mmu_context.h>
24#include <asm/io.h>
25#include <asm/pgtable.h>
26#include <asm/core_cia.h>
27#include <asm/tlbflush.h>
28
29#include "proto.h"
30#include "irq_impl.h"
31#include "pci_impl.h"
32#include "machvec_impl.h"
33
34
35static void
36miata_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
37{
38 int irq;
39
40 irq = (vector - 0x800) >> 4;
41
42 /*
43 * I really hate to do this, but the MIATA SRM console ignores the
44 * low 8 bits in the interrupt summary register, and reports the
45 * vector 0x80 *lower* than I expected from the bit numbering in
46 * the documentation.
47 * This was done because the low 8 summary bits really aren't used
48 * for reporting any interrupts (the PCI-ISA bridge, bit 7, isn't
49 * used for this purpose, as PIC interrupts are delivered as the
50 * vectors 0x800-0x8f0).
51 * But I really don't want to change the fixup code for allocation
52 * of IRQs, nor the alpha_irq_mask maintenance stuff, both of which
53 * look nice and clean now.
54 * So, here's this grotty hack... :-(
55 */
56 if (irq >= 16)
57 irq = irq + 8;
58
59 handle_irq(irq, regs);
60}
61
62static void __init
63miata_init_irq(void)
64{
65 if (alpha_using_srm)
66 alpha_mv.device_interrupt = miata_srm_device_interrupt;
67
68#if 0
69 /* These break on MiataGL so we'll try not to do it at all. */
70 *(vulp)PYXIS_INT_HILO = 0x000000B2UL; mb(); /* ISA/NMI HI */
71 *(vulp)PYXIS_RT_COUNT = 0UL; mb(); /* clear count */
72#endif
73
74 init_i8259a_irqs();
75
76 /* Not interested in the bogus interrupts (3,10), Fan Fault (0),
77 NMI (1), or EIDE (9).
78
79 We also disable the risers (4,5), since we don't know how to
80 route the interrupts behind the bridge. */
81 init_pyxis_irqs(0x63b0000);
82
83 common_init_isa_dma();
84 setup_irq(16+2, &halt_switch_irqaction); /* SRM only? */
85 setup_irq(16+6, &timer_cascade_irqaction);
86}
87
88
89/*
90 * PCI Fixup configuration.
91 *
92 * Summary @ PYXIS_INT_REQ:
93 * Bit Meaning
94 * 0 Fan Fault
95 * 1 NMI
96 * 2 Halt/Reset switch
97 * 3 none
98 * 4 CID0 (Riser ID)
99 * 5 CID1 (Riser ID)
100 * 6 Interval timer
101 * 7 PCI-ISA Bridge
102 * 8 Ethernet
103 * 9 EIDE (deprecated, ISA 14/15 used)
104 *10 none
105 *11 USB
106 *12 Interrupt Line A from slot 4
107 *13 Interrupt Line B from slot 4
108 *14 Interrupt Line C from slot 4
109 *15 Interrupt Line D from slot 4
110 *16 Interrupt Line A from slot 5
111 *17 Interrupt line B from slot 5
112 *18 Interrupt Line C from slot 5
113 *19 Interrupt Line D from slot 5
114 *20 Interrupt Line A from slot 1
115 *21 Interrupt Line B from slot 1
116 *22 Interrupt Line C from slot 1
117 *23 Interrupt Line D from slot 1
118 *24 Interrupt Line A from slot 2
119 *25 Interrupt Line B from slot 2
120 *26 Interrupt Line C from slot 2
121 *27 Interrupt Line D from slot 2
122 *27 Interrupt Line A from slot 3
123 *29 Interrupt Line B from slot 3
124 *30 Interrupt Line C from slot 3
125 *31 Interrupt Line D from slot 3
126 *
127 * The device to slot mapping looks like:
128 *
129 * Slot Device
130 * 3 DC21142 Ethernet
131 * 4 EIDE CMD646
132 * 5 none
133 * 6 USB
134 * 7 PCI-ISA bridge
135 * 8 PCI-PCI Bridge (SBU Riser)
136 * 9 none
137 * 10 none
138 * 11 PCI on board slot 4 (SBU Riser)
139 * 12 PCI on board slot 5 (SBU Riser)
140 *
141 * These are behind the bridge, so I'm not sure what to do...
142 *
143 * 13 PCI on board slot 1 (SBU Riser)
144 * 14 PCI on board slot 2 (SBU Riser)
145 * 15 PCI on board slot 3 (SBU Riser)
146 *
147 *
148 * This two layered interrupt approach means that we allocate IRQ 16 and
149 * above for PCI interrupts. The IRQ relates to which bit the interrupt
150 * comes in on. This makes interrupt processing much easier.
151 */
152
153static int __init
154miata_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
155{
156 static char irq_tab[18][5] __initdata = {
157 /*INT INTA INTB INTC INTD */
158 {16+ 8, 16+ 8, 16+ 8, 16+ 8, 16+ 8}, /* IdSel 14, DC21142 */
159 { -1, -1, -1, -1, -1}, /* IdSel 15, EIDE */
160 { -1, -1, -1, -1, -1}, /* IdSel 16, none */
161 { -1, -1, -1, -1, -1}, /* IdSel 17, none */
162 { -1, -1, -1, -1, -1}, /* IdSel 18, PCI-ISA */
163 { -1, -1, -1, -1, -1}, /* IdSel 19, PCI-PCI */
164 { -1, -1, -1, -1, -1}, /* IdSel 20, none */
165 { -1, -1, -1, -1, -1}, /* IdSel 21, none */
166 {16+12, 16+12, 16+13, 16+14, 16+15}, /* IdSel 22, slot 4 */
167 {16+16, 16+16, 16+17, 16+18, 16+19}, /* IdSel 23, slot 5 */
168 /* the next 7 are actually on PCI bus 1, across the bridge */
169 {16+11, 16+11, 16+11, 16+11, 16+11}, /* IdSel 24, QLISP/GL*/
170 { -1, -1, -1, -1, -1}, /* IdSel 25, none */
171 { -1, -1, -1, -1, -1}, /* IdSel 26, none */
172 { -1, -1, -1, -1, -1}, /* IdSel 27, none */
173 {16+20, 16+20, 16+21, 16+22, 16+23}, /* IdSel 28, slot 1 */
174 {16+24, 16+24, 16+25, 16+26, 16+27}, /* IdSel 29, slot 2 */
175 {16+28, 16+28, 16+29, 16+30, 16+31}, /* IdSel 30, slot 3 */
176 /* This bridge is on the main bus of the later orig MIATA */
177 { -1, -1, -1, -1, -1}, /* IdSel 31, PCI-PCI */
178 };
179 const long min_idsel = 3, max_idsel = 20, irqs_per_slot = 5;
180
181 /* the USB function of the 82c693 has it's interrupt connected to
182 the 2nd 8259 controller. So we have to check for it first. */
183
184 if((slot == 7) && (PCI_FUNC(dev->devfn) == 3)) {
185 u8 irq=0;
186
187 if(pci_read_config_byte(pci_find_slot(dev->bus->number, dev->devfn & ~(7)), 0x40,&irq)!=PCIBIOS_SUCCESSFUL)
188 return -1;
189 else
190 return irq;
191 }
192
193 return COMMON_TABLE_LOOKUP;
194}
195
196static u8 __init
197miata_swizzle(struct pci_dev *dev, u8 *pinp)
198{
199 int slot, pin = *pinp;
200
201 if (dev->bus->number == 0) {
202 slot = PCI_SLOT(dev->devfn);
203 }
204 /* Check for the built-in bridge. */
205 else if ((PCI_SLOT(dev->bus->self->devfn) == 8) ||
206 (PCI_SLOT(dev->bus->self->devfn) == 20)) {
207 slot = PCI_SLOT(dev->devfn) + 9;
208 }
209 else
210 {
211 /* Must be a card-based bridge. */
212 do {
213 if ((PCI_SLOT(dev->bus->self->devfn) == 8) ||
214 (PCI_SLOT(dev->bus->self->devfn) == 20)) {
215 slot = PCI_SLOT(dev->devfn) + 9;
216 break;
217 }
218 pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
219
220 /* Move up the chain of bridges. */
221 dev = dev->bus->self;
222 /* Slot of the next bridge. */
223 slot = PCI_SLOT(dev->devfn);
224 } while (dev->bus->self);
225 }
226 *pinp = pin;
227 return slot;
228}
229
230static void __init
231miata_init_pci(void)
232{
233 cia_init_pci();
234 SMC669_Init(0); /* it might be a GL (fails harmlessly if not) */
235 es1888_init();
236}
237
238static void
239miata_kill_arch(int mode)
240{
241 cia_kill_arch(mode);
242
243#ifndef ALPHA_RESTORE_SRM_SETUP
244 switch(mode) {
245 case LINUX_REBOOT_CMD_RESTART:
246 /* Who said DEC engineers have no sense of humor? ;-) */
247 if (alpha_using_srm) {
248 *(vuip) PYXIS_RESET = 0x0000dead;
249 mb();
250 }
251 break;
252 case LINUX_REBOOT_CMD_HALT:
253 break;
254 case LINUX_REBOOT_CMD_POWER_OFF:
255 break;
256 }
257
258 halt();
259#endif
260}
261
262
263/*
264 * The System Vector
265 */
266
267struct alpha_machine_vector miata_mv __initmv = {
268 .vector_name = "Miata",
269 DO_EV5_MMU,
270 DO_DEFAULT_RTC,
271 DO_PYXIS_IO,
272 .machine_check = cia_machine_check,
273 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
274 .min_io_address = DEFAULT_IO_BASE,
275 .min_mem_address = DEFAULT_MEM_BASE,
276 .pci_dac_offset = PYXIS_DAC_OFFSET,
277
278 .nr_irqs = 48,
279 .device_interrupt = pyxis_device_interrupt,
280
281 .init_arch = pyxis_init_arch,
282 .init_irq = miata_init_irq,
283 .init_rtc = common_init_rtc,
284 .init_pci = miata_init_pci,
285 .kill_arch = miata_kill_arch,
286 .pci_map_irq = miata_map_irq,
287 .pci_swizzle = miata_swizzle,
288};
289ALIAS_MV(miata)