2 * linux/arch/alpha/kernel/sys_mikasa.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 MIKASA (AlphaServer 1000).
11 #include <linux/config.h>
12 #include <linux/kernel.h>
13 #include <linux/types.h>
15 #include <linux/sched.h>
16 #include <linux/pci.h>
17 #include <linux/init.h>
18 #include <linux/bitops.h>
20 #include <asm/ptrace.h>
21 #include <asm/system.h>
24 #include <asm/mmu_context.h>
26 #include <asm/pgtable.h>
27 #include <asm/core_apecs.h>
28 #include <asm/core_cia.h>
29 #include <asm/tlbflush.h>
34 #include "machvec_impl.h"
37 /* Note mask bit is true for ENABLED irqs. */
38 static int cached_irq_mask;
41 mikasa_update_irq_hw(int mask)
47 mikasa_enable_irq(unsigned int irq)
49 mikasa_update_irq_hw(cached_irq_mask |= 1 << (irq - 16));
53 mikasa_disable_irq(unsigned int irq)
55 mikasa_update_irq_hw(cached_irq_mask &= ~(1 << (irq - 16)));
59 mikasa_startup_irq(unsigned int irq)
61 mikasa_enable_irq(irq);
66 mikasa_end_irq(unsigned int irq)
68 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
69 mikasa_enable_irq(irq);
72 static struct hw_interrupt_type mikasa_irq_type = {
74 .startup = mikasa_startup_irq,
75 .shutdown = mikasa_disable_irq,
76 .enable = mikasa_enable_irq,
77 .disable = mikasa_disable_irq,
78 .ack = mikasa_disable_irq,
79 .end = mikasa_end_irq,
83 mikasa_device_interrupt(unsigned long vector, struct pt_regs *regs)
88 /* Read the interrupt summary registers */
89 pld = (((~inw(0x534) & 0x0000ffffUL) << 16)
90 | (((unsigned long) inb(0xa0)) << 8)
94 * Now for every possible bit set, work through them and call
95 * the appropriate interrupt handler.
99 pld &= pld - 1; /* clear least bit set */
101 isa_device_interrupt(vector, regs);
109 mikasa_init_irq(void)
114 alpha_mv.device_interrupt = srm_device_interrupt;
116 mikasa_update_irq_hw(0);
118 for (i = 16; i < 32; ++i) {
119 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
120 irq_desc[i].chip = &mikasa_irq_type;
124 common_init_isa_dma();
129 * PCI Fixup configuration.
133 * 0 Interrupt Line A from slot 0
134 * 1 Interrupt Line B from slot 0
135 * 2 Interrupt Line C from slot 0
136 * 3 Interrupt Line D from slot 0
137 * 4 Interrupt Line A from slot 1
138 * 5 Interrupt line B from slot 1
139 * 6 Interrupt Line C from slot 1
140 * 7 Interrupt Line D from slot 1
141 * 8 Interrupt Line A from slot 2
142 * 9 Interrupt Line B from slot 2
143 *10 Interrupt Line C from slot 2
144 *11 Interrupt Line D from slot 2
146 *13 Power Supply Fail
150 * The device to slot mapping looks like:
153 * 6 NCR SCSI controller
154 * 7 Intel PCI-EISA bridge chip
155 * 11 PCI on board slot 0
156 * 12 PCI on board slot 1
157 * 13 PCI on board slot 2
160 * This two layered interrupt approach means that we allocate IRQ 16 and
161 * above for PCI interrupts. The IRQ relates to which bit the interrupt
162 * comes in on. This makes interrupt processing much easier.
166 mikasa_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
168 static char irq_tab[8][5] __initdata = {
169 /*INT INTA INTB INTC INTD */
170 {16+12, 16+12, 16+12, 16+12, 16+12}, /* IdSel 17, SCSI */
171 { -1, -1, -1, -1, -1}, /* IdSel 18, PCEB */
172 { -1, -1, -1, -1, -1}, /* IdSel 19, ???? */
173 { -1, -1, -1, -1, -1}, /* IdSel 20, ???? */
174 { -1, -1, -1, -1, -1}, /* IdSel 21, ???? */
175 { 16+0, 16+0, 16+1, 16+2, 16+3}, /* IdSel 22, slot 0 */
176 { 16+4, 16+4, 16+5, 16+6, 16+7}, /* IdSel 23, slot 1 */
177 { 16+8, 16+8, 16+9, 16+10, 16+11}, /* IdSel 24, slot 2 */
179 const long min_idsel = 6, max_idsel = 13, irqs_per_slot = 5;
180 return COMMON_TABLE_LOOKUP;
184 #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
186 mikasa_apecs_machine_check(unsigned long vector, unsigned long la_ptr,
187 struct pt_regs * regs)
189 #define MCHK_NO_DEVSEL 0x205U
190 #define MCHK_NO_TABT 0x204U
192 struct el_common *mchk_header;
195 mchk_header = (struct el_common *)la_ptr;
197 /* Clear the error before any reporting. */
205 code = mchk_header->code;
206 process_mcheck_info(vector, la_ptr, regs, "MIKASA APECS",
208 && (code == MCHK_NO_DEVSEL
209 || code == MCHK_NO_TABT)));
218 #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
219 struct alpha_machine_vector mikasa_mv __initmv = {
220 .vector_name = "Mikasa",
224 .machine_check = mikasa_apecs_machine_check,
225 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
226 .min_io_address = DEFAULT_IO_BASE,
227 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
230 .device_interrupt = mikasa_device_interrupt,
232 .init_arch = apecs_init_arch,
233 .init_irq = mikasa_init_irq,
234 .init_rtc = common_init_rtc,
235 .init_pci = common_init_pci,
236 .pci_map_irq = mikasa_map_irq,
237 .pci_swizzle = common_swizzle,
242 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PRIMO)
243 struct alpha_machine_vector mikasa_primo_mv __initmv = {
244 .vector_name = "Mikasa-Primo",
248 .machine_check = cia_machine_check,
249 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
250 .min_io_address = DEFAULT_IO_BASE,
251 .min_mem_address = CIA_DEFAULT_MEM_BASE,
254 .device_interrupt = mikasa_device_interrupt,
256 .init_arch = cia_init_arch,
257 .init_irq = mikasa_init_irq,
258 .init_rtc = common_init_rtc,
259 .init_pci = cia_init_pci,
260 .kill_arch = cia_kill_arch,
261 .pci_map_irq = mikasa_map_irq,
262 .pci_swizzle = common_swizzle,
264 ALIAS_MV(mikasa_primo)