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-rw-r--r--arch/alpha/kernel/sys_takara.c296
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diff --git a/arch/alpha/kernel/sys_takara.c b/arch/alpha/kernel/sys_takara.c
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1/*
2 * linux/arch/alpha/kernel/sys_takara.c
3 *
4 * Copyright (C) 1995 David A Rusling
5 * Copyright (C) 1996 Jay A Estabrook
6 * Copyright (C) 1998, 1999 Richard Henderson
7 *
8 * Code supporting the TAKARA.
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
18#include <asm/ptrace.h>
19#include <asm/system.h>
20#include <asm/dma.h>
21#include <asm/irq.h>
22#include <asm/mmu_context.h>
23#include <asm/io.h>
24#include <asm/pgtable.h>
25#include <asm/core_cia.h>
26#include <asm/tlbflush.h>
27
28#include "proto.h"
29#include "irq_impl.h"
30#include "pci_impl.h"
31#include "machvec_impl.h"
32
33
34/* Note mask bit is true for DISABLED irqs. */
35static unsigned long cached_irq_mask[2] = { -1, -1 };
36
37static inline void
38takara_update_irq_hw(unsigned long irq, unsigned long mask)
39{
40 int regaddr;
41
42 mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30));
43 regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
44 outl(mask & 0xffff0000UL, regaddr);
45}
46
47static inline void
48takara_enable_irq(unsigned int irq)
49{
50 unsigned long mask;
51 mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
52 takara_update_irq_hw(irq, mask);
53}
54
55static void
56takara_disable_irq(unsigned int irq)
57{
58 unsigned long mask;
59 mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
60 takara_update_irq_hw(irq, mask);
61}
62
63static unsigned int
64takara_startup_irq(unsigned int irq)
65{
66 takara_enable_irq(irq);
67 return 0; /* never anything pending */
68}
69
70static void
71takara_end_irq(unsigned int irq)
72{
73 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
74 takara_enable_irq(irq);
75}
76
77static struct hw_interrupt_type takara_irq_type = {
78 .typename = "TAKARA",
79 .startup = takara_startup_irq,
80 .shutdown = takara_disable_irq,
81 .enable = takara_enable_irq,
82 .disable = takara_disable_irq,
83 .ack = takara_disable_irq,
84 .end = takara_end_irq,
85};
86
87static void
88takara_device_interrupt(unsigned long vector, struct pt_regs *regs)
89{
90 unsigned intstatus;
91
92 /*
93 * The PALcode will have passed us vectors 0x800 or 0x810,
94 * which are fairly arbitrary values and serve only to tell
95 * us whether an interrupt has come in on IRQ0 or IRQ1. If
96 * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's
97 * probably ISA, but PCI interrupts can come through IRQ0
98 * as well if the interrupt controller isn't in accelerated
99 * mode.
100 *
101 * OTOH, the accelerator thing doesn't seem to be working
102 * overly well, so what we'll do instead is try directly
103 * examining the Master Interrupt Register to see if it's a
104 * PCI interrupt, and if _not_ then we'll pass it on to the
105 * ISA handler.
106 */
107
108 intstatus = inw(0x500) & 15;
109 if (intstatus) {
110 /*
111 * This is a PCI interrupt. Check each bit and
112 * despatch an interrupt if it's set.
113 */
114
115 if (intstatus & 8) handle_irq(16+3, regs);
116 if (intstatus & 4) handle_irq(16+2, regs);
117 if (intstatus & 2) handle_irq(16+1, regs);
118 if (intstatus & 1) handle_irq(16+0, regs);
119 } else {
120 isa_device_interrupt (vector, regs);
121 }
122}
123
124static void
125takara_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
126{
127 int irq = (vector - 0x800) >> 4;
128 handle_irq(irq, regs);
129}
130
131static void __init
132takara_init_irq(void)
133{
134 long i;
135
136 init_i8259a_irqs();
137
138 if (alpha_using_srm) {
139 alpha_mv.device_interrupt = takara_srm_device_interrupt;
140 } else {
141 unsigned int ctlreg = inl(0x500);
142
143 /* Return to non-accelerated mode. */
144 ctlreg &= ~0x8000;
145 outl(ctlreg, 0x500);
146
147 /* Enable the PCI interrupt register. */
148 ctlreg = 0x05107c00;
149 outl(ctlreg, 0x500);
150 }
151
152 for (i = 16; i < 128; i += 16)
153 takara_update_irq_hw(i, -1);
154
155 for (i = 16; i < 128; ++i) {
156 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
157 irq_desc[i].handler = &takara_irq_type;
158 }
159
160 common_init_isa_dma();
161}
162
163
164/*
165 * The Takara has PCI devices 1, 2, and 3 configured to slots 20,
166 * 19, and 18 respectively, in the default configuration. They can
167 * also be jumpered to slots 8, 7, and 6 respectively, which is fun
168 * because the SIO ISA bridge can also be slot 7. However, the SIO
169 * doesn't explicitly generate PCI-type interrupts, so we can
170 * assign it whatever the hell IRQ we like and it doesn't matter.
171 */
172
173static int __init
174takara_map_irq_srm(struct pci_dev *dev, u8 slot, u8 pin)
175{
176 static char irq_tab[15][5] __initdata = {
177 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */
178 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */
179 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */
180 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */
181 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */
182 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */
183 /* These are behind the bridges. */
184 { 12, 12, 13, 14, 15}, /* slot 12 == nothing */
185 { 8, 8, 9, 19, 11}, /* slot 13 == nothing */
186 { 4, 4, 5, 6, 7}, /* slot 14 == nothing */
187 { 0, 0, 1, 2, 3}, /* slot 15 == nothing */
188 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */
189 {64+ 0, 64+0, 64+1, 64+2, 64+3}, /* slot 17= device 4 */
190 {48+ 0, 48+0, 48+1, 48+2, 48+3}, /* slot 18= device 3 */
191 {32+ 0, 32+0, 32+1, 32+2, 32+3}, /* slot 19= device 2 */
192 {16+ 0, 16+0, 16+1, 16+2, 16+3}, /* slot 20= device 1 */
193 };
194 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
195 int irq = COMMON_TABLE_LOOKUP;
196 if (irq >= 0 && irq < 16) {
197 /* Guess that we are behind a bridge. */
198 unsigned int busslot = PCI_SLOT(dev->bus->self->devfn);
199 irq += irq_tab[busslot-min_idsel][0];
200 }
201 return irq;
202}
203
204static int __init
205takara_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
206{
207 static char irq_tab[15][5] __initdata = {
208 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */
209 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */
210 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */
211 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */
212 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */
213 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */
214 { -1, -1, -1, -1, -1}, /* slot 12 == nothing */
215 { -1, -1, -1, -1, -1}, /* slot 13 == nothing */
216 { -1, -1, -1, -1, -1}, /* slot 14 == nothing */
217 { -1, -1, -1, -1, -1}, /* slot 15 == nothing */
218 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */
219 { -1, -1, -1, -1, -1}, /* slot 17 == nothing */
220 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 18 == device 3 */
221 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 19 == device 2 */
222 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 20 == device 1 */
223 };
224 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
225 return COMMON_TABLE_LOOKUP;
226}
227
228static u8 __init
229takara_swizzle(struct pci_dev *dev, u8 *pinp)
230{
231 int slot = PCI_SLOT(dev->devfn);
232 int pin = *pinp;
233 unsigned int ctlreg = inl(0x500);
234 unsigned int busslot;
235
236 if (!dev->bus->self)
237 return slot;
238
239 busslot = PCI_SLOT(dev->bus->self->devfn);
240 /* Check for built-in bridges. */
241 if (dev->bus->number != 0
242 && busslot > 16
243 && ((1<<(36-busslot)) & ctlreg)) {
244 if (pin == 1)
245 pin += (20 - busslot);
246 else {
247 printk(KERN_WARNING "takara_swizzle: can only "
248 "handle cards with INTA IRQ pin.\n");
249 }
250 } else {
251 /* Must be a card-based bridge. */
252 printk(KERN_WARNING "takara_swizzle: cannot handle "
253 "card-bridge behind builtin bridge yet.\n");
254 }
255
256 *pinp = pin;
257 return slot;
258}
259
260static void __init
261takara_init_pci(void)
262{
263 if (alpha_using_srm)
264 alpha_mv.pci_map_irq = takara_map_irq_srm;
265
266 cia_init_pci();
267 ns87312_enable_ide(0x26e);
268}
269
270
271/*
272 * The System Vector
273 */
274
275struct alpha_machine_vector takara_mv __initmv = {
276 .vector_name = "Takara",
277 DO_EV5_MMU,
278 DO_DEFAULT_RTC,
279 DO_CIA_IO,
280 .machine_check = cia_machine_check,
281 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
282 .min_io_address = DEFAULT_IO_BASE,
283 .min_mem_address = CIA_DEFAULT_MEM_BASE,
284
285 .nr_irqs = 128,
286 .device_interrupt = takara_device_interrupt,
287
288 .init_arch = cia_init_arch,
289 .init_irq = takara_init_irq,
290 .init_rtc = common_init_rtc,
291 .init_pci = takara_init_pci,
292 .kill_arch = cia_kill_arch,
293 .pci_map_irq = takara_map_irq,
294 .pci_swizzle = takara_swizzle,
295};
296ALIAS_MV(takara)
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-29 09:22:41 -0500