2 * linux/arch/alpha/kernel/sys_eb64p.c
4 * Copyright (C) 1995 David A Rusling
5 * Copyright (C) 1996 Jay A Estabrook
6 * Copyright (C) 1998, 1999 Richard Henderson
8 * Code supporting the EB64+ and EB66.
11 #include <linux/kernel.h>
12 #include <linux/types.h>
14 #include <linux/sched.h>
15 #include <linux/pci.h>
16 #include <linux/init.h>
17 #include <linux/bitops.h>
19 #include <asm/ptrace.h>
20 #include <asm/system.h>
23 #include <asm/mmu_context.h>
25 #include <asm/pgtable.h>
26 #include <asm/core_apecs.h>
27 #include <asm/core_lca.h>
28 #include <asm/hwrpb.h>
29 #include <asm/tlbflush.h>
34 #include "machvec_impl.h"
37 /* Note mask bit is true for DISABLED irqs. */
38 static unsigned int cached_irq_mask = -1;
41 eb64p_update_irq_hw(unsigned int irq, unsigned long mask)
43 outb(mask >> (irq >= 24 ? 24 : 16), (irq >= 24 ? 0x27 : 0x26));
47 eb64p_enable_irq(unsigned int irq)
49 eb64p_update_irq_hw(irq, cached_irq_mask &= ~(1 << irq));
53 eb64p_disable_irq(unsigned int irq)
55 eb64p_update_irq_hw(irq, cached_irq_mask |= 1 << irq);
59 eb64p_startup_irq(unsigned int irq)
61 eb64p_enable_irq(irq);
62 return 0; /* never anything pending */
66 eb64p_end_irq(unsigned int irq)
68 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
69 eb64p_enable_irq(irq);
72 static struct hw_interrupt_type eb64p_irq_type = {
74 .startup = eb64p_startup_irq,
75 .shutdown = eb64p_disable_irq,
76 .enable = eb64p_enable_irq,
77 .disable = eb64p_disable_irq,
78 .ack = eb64p_disable_irq,
83 eb64p_device_interrupt(unsigned long vector, struct pt_regs *regs)
88 /* Read the interrupt summary registers */
89 pld = inb(0x26) | (inb(0x27) << 8);
92 * Now, for every possible bit set, work through
93 * them and call the appropriate interrupt handler.
97 pld &= pld - 1; /* clear least bit set */
100 isa_device_interrupt(vector, regs);
102 handle_irq(16 + i, regs);
112 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET)
114 * CABRIO SRM may not set variation correctly, so here we test
115 * the high word of the interrupt summary register for the RAZ
116 * bits, and hope that a true EB64+ would read all ones...
118 if (inw(0x806) != 0xffff) {
119 extern struct alpha_machine_vector cabriolet_mv;
121 printk("Detected Cabriolet: correcting HWRPB.\n");
123 hwrpb->sys_variation |= 2L << 10;
124 hwrpb_update_checksum(hwrpb);
126 alpha_mv = cabriolet_mv;
137 for (i = 16; i < 32; ++i) {
138 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
139 irq_desc[i].chip = &eb64p_irq_type;
142 common_init_isa_dma();
143 setup_irq(16+5, &isa_cascade_irqaction);
147 * PCI Fixup configuration.
149 * There are two 8 bit external summary registers as follows:
153 * 0 Interrupt Line A from slot 0
154 * 1 Interrupt Line A from slot 1
155 * 2 Interrupt Line B from slot 0
156 * 3 Interrupt Line B from slot 1
157 * 4 Interrupt Line C from slot 0
158 * 5 Interrupt line from the two ISA PICs
164 * 0 Interrupt Line C from slot 1
165 * 1 Interrupt Line D from slot 0
166 * 2 Interrupt Line D from slot 1
173 * The device to slot mapping looks like:
176 * 5 NCR SCSI controller
177 * 6 PCI on board slot 0
178 * 7 PCI on board slot 1
179 * 8 Intel SIO PCI-ISA bridge chip
180 * 9 Tulip - DECchip 21040 Ethernet controller
183 * This two layered interrupt approach means that we allocate IRQ 16 and
184 * above for PCI interrupts. The IRQ relates to which bit the interrupt
185 * comes in on. This makes interrupt processing much easier.
189 eb64p_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
191 static char irq_tab[5][5] __initdata = {
192 /*INT INTA INTB INTC INTD */
193 {16+7, 16+7, 16+7, 16+7, 16+7}, /* IdSel 5, slot ?, ?? */
194 {16+0, 16+0, 16+2, 16+4, 16+9}, /* IdSel 6, slot ?, ?? */
195 {16+1, 16+1, 16+3, 16+8, 16+10}, /* IdSel 7, slot ?, ?? */
196 { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
197 {16+6, 16+6, 16+6, 16+6, 16+6}, /* IdSel 9, TULIP */
199 const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
200 return COMMON_TABLE_LOOKUP;
208 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB64P)
209 struct alpha_machine_vector eb64p_mv __initmv = {
210 .vector_name = "EB64+",
214 .machine_check = apecs_machine_check,
215 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
216 .min_io_address = DEFAULT_IO_BASE,
217 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
220 .device_interrupt = eb64p_device_interrupt,
222 .init_arch = apecs_init_arch,
223 .init_irq = eb64p_init_irq,
224 .init_rtc = common_init_rtc,
225 .init_pci = common_init_pci,
227 .pci_map_irq = eb64p_map_irq,
228 .pci_swizzle = common_swizzle,
233 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66)
234 struct alpha_machine_vector eb66_mv __initmv = {
235 .vector_name = "EB66",
239 .machine_check = lca_machine_check,
240 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
241 .min_io_address = DEFAULT_IO_BASE,
242 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
245 .device_interrupt = eb64p_device_interrupt,
247 .init_arch = lca_init_arch,
248 .init_irq = eb64p_init_irq,
249 .init_rtc = common_init_rtc,
250 .init_pci = common_init_pci,
251 .pci_map_irq = eb64p_map_irq,
252 .pci_swizzle = common_swizzle,