2 * linux/arch/alpha/kernel/sys_alcor.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 ALCOR and XLT (XL-300/366/433).
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/reboot.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_cia.h>
28 #include <asm/tlbflush.h>
33 #include "machvec_impl.h"
36 /* Note mask bit is true for ENABLED irqs. */
37 static unsigned long cached_irq_mask;
40 alcor_update_irq_hw(unsigned long mask)
42 *(vuip)GRU_INT_MASK = mask;
47 alcor_enable_irq(unsigned int irq)
49 alcor_update_irq_hw(cached_irq_mask |= 1UL << (irq - 16));
53 alcor_disable_irq(unsigned int irq)
55 alcor_update_irq_hw(cached_irq_mask &= ~(1UL << (irq - 16)));
59 alcor_mask_and_ack_irq(unsigned int irq)
61 alcor_disable_irq(irq);
63 /* On ALCOR/XLT, need to dismiss interrupt via GRU. */
64 *(vuip)GRU_INT_CLEAR = 1 << (irq - 16); mb();
65 *(vuip)GRU_INT_CLEAR = 0; mb();
69 alcor_startup_irq(unsigned int irq)
71 alcor_enable_irq(irq);
76 alcor_isa_mask_and_ack_irq(unsigned int irq)
78 i8259a_mask_and_ack_irq(irq);
80 /* On ALCOR/XLT, need to dismiss interrupt via GRU. */
81 *(vuip)GRU_INT_CLEAR = 0x80000000; mb();
82 *(vuip)GRU_INT_CLEAR = 0; mb();
86 alcor_end_irq(unsigned int irq)
88 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
89 alcor_enable_irq(irq);
92 static struct hw_interrupt_type alcor_irq_type = {
94 .startup = alcor_startup_irq,
95 .shutdown = alcor_disable_irq,
96 .enable = alcor_enable_irq,
97 .disable = alcor_disable_irq,
98 .ack = alcor_mask_and_ack_irq,
103 alcor_device_interrupt(unsigned long vector, struct pt_regs *regs)
108 /* Read the interrupt summary register of the GRU */
109 pld = (*(vuip)GRU_INT_REQ) & GRU_INT_REQ_BITS;
112 * Now for every possible bit set, work through them and call
113 * the appropriate interrupt handler.
117 pld &= pld - 1; /* clear least bit set */
119 isa_device_interrupt(vector, regs);
121 handle_irq(16 + i, regs);
132 alpha_mv.device_interrupt = srm_device_interrupt;
134 *(vuip)GRU_INT_MASK = 0; mb(); /* all disabled */
135 *(vuip)GRU_INT_EDGE = 0; mb(); /* all are level */
136 *(vuip)GRU_INT_HILO = 0x80000000U; mb(); /* ISA only HI */
137 *(vuip)GRU_INT_CLEAR = 0; mb(); /* all clear */
139 for (i = 16; i < 48; ++i) {
140 /* On Alcor, at least, lines 20..30 are not connected
141 and can generate spurrious interrupts if we turn them
142 on while IRQ probing. */
143 if (i >= 16+20 && i <= 16+30)
145 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
146 irq_desc[i].chip = &alcor_irq_type;
148 i8259a_irq_type.ack = alcor_isa_mask_and_ack_irq;
151 common_init_isa_dma();
153 setup_irq(16+31, &isa_cascade_irqaction);
158 * PCI Fixup configuration.
160 * Summary @ GRU_INT_REQ:
162 * 0 Interrupt Line A from slot 2
163 * 1 Interrupt Line B from slot 2
164 * 2 Interrupt Line C from slot 2
165 * 3 Interrupt Line D from slot 2
166 * 4 Interrupt Line A from slot 1
167 * 5 Interrupt line B from slot 1
168 * 6 Interrupt Line C from slot 1
169 * 7 Interrupt Line D from slot 1
170 * 8 Interrupt Line A from slot 0
171 * 9 Interrupt Line B from slot 0
172 *10 Interrupt Line C from slot 0
173 *11 Interrupt Line D from slot 0
174 *12 Interrupt Line A from slot 4
175 *13 Interrupt Line B from slot 4
176 *14 Interrupt Line C from slot 4
177 *15 Interrupt Line D from slot 4
178 *16 Interrupt Line D from slot 3
179 *17 Interrupt Line D from slot 3
180 *18 Interrupt Line D from slot 3
181 *19 Interrupt Line D from slot 3
185 * The device to slot mapping looks like:
188 * 6 built-in TULIP (XLT only)
189 * 7 PCI on board slot 0
190 * 8 PCI on board slot 3
191 * 9 PCI on board slot 4
192 * 10 PCEB (PCI-EISA bridge)
193 * 11 PCI on board slot 2
194 * 12 PCI on board slot 1
197 * This two layered interrupt approach means that we allocate IRQ 16 and
198 * above for PCI interrupts. The IRQ relates to which bit the interrupt
199 * comes in on. This makes interrupt processing much easier.
203 alcor_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
205 static char irq_tab[7][5] __initdata = {
206 /*INT INTA INTB INTC INTD */
207 /* note: IDSEL 17 is XLT only */
208 {16+13, 16+13, 16+13, 16+13, 16+13}, /* IdSel 17, TULIP */
209 { 16+8, 16+8, 16+9, 16+10, 16+11}, /* IdSel 18, slot 0 */
210 {16+16, 16+16, 16+17, 16+18, 16+19}, /* IdSel 19, slot 3 */
211 {16+12, 16+12, 16+13, 16+14, 16+15}, /* IdSel 20, slot 4 */
212 { -1, -1, -1, -1, -1}, /* IdSel 21, PCEB */
213 { 16+0, 16+0, 16+1, 16+2, 16+3}, /* IdSel 22, slot 2 */
214 { 16+4, 16+4, 16+5, 16+6, 16+7}, /* IdSel 23, slot 1 */
216 const long min_idsel = 6, max_idsel = 12, irqs_per_slot = 5;
217 return COMMON_TABLE_LOOKUP;
221 alcor_kill_arch(int mode)
225 #ifndef ALPHA_RESTORE_SRM_SETUP
227 case LINUX_REBOOT_CMD_RESTART:
228 /* Who said DEC engineer's have no sense of humor? ;-) */
229 if (alpha_using_srm) {
230 *(vuip) GRU_RESET = 0x0000dead;
234 case LINUX_REBOOT_CMD_HALT:
236 case LINUX_REBOOT_CMD_POWER_OFF:
252 * Now we can look to see if we are really running on an XLT-type
253 * motherboard, by looking for a 21040 TULIP in slot 6, which is
254 * built into XLT and BRET/MAVERICK, but not available on ALCOR.
256 dev = pci_get_device(PCI_VENDOR_ID_DEC,
257 PCI_DEVICE_ID_DEC_TULIP,
259 if (dev && dev->devfn == PCI_DEVFN(6,0)) {
260 alpha_mv.sys.cia.gru_int_req_bits = XLT_GRU_INT_REQ_BITS;
261 printk(KERN_INFO "%s: Detected AS500 or XLT motherboard.\n",
272 struct alpha_machine_vector alcor_mv __initmv = {
273 .vector_name = "Alcor",
277 .machine_check = cia_machine_check,
278 .max_isa_dma_address = ALPHA_ALCOR_MAX_ISA_DMA_ADDRESS,
279 .min_io_address = EISA_DEFAULT_IO_BASE,
280 .min_mem_address = CIA_DEFAULT_MEM_BASE,
283 .device_interrupt = alcor_device_interrupt,
285 .init_arch = cia_init_arch,
286 .init_irq = alcor_init_irq,
287 .init_rtc = common_init_rtc,
288 .init_pci = alcor_init_pci,
289 .kill_arch = alcor_kill_arch,
290 .pci_map_irq = alcor_map_irq,
291 .pci_swizzle = common_swizzle,
294 .gru_int_req_bits = ALCOR_GRU_INT_REQ_BITS
299 struct alpha_machine_vector xlt_mv __initmv = {
300 .vector_name = "XLT",
304 .machine_check = cia_machine_check,
305 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
306 .min_io_address = EISA_DEFAULT_IO_BASE,
307 .min_mem_address = CIA_DEFAULT_MEM_BASE,
310 .device_interrupt = alcor_device_interrupt,
312 .init_arch = cia_init_arch,
313 .init_irq = alcor_init_irq,
314 .init_rtc = common_init_rtc,
315 .init_pci = alcor_init_pci,
316 .kill_arch = alcor_kill_arch,
317 .pci_map_irq = alcor_map_irq,
318 .pci_swizzle = common_swizzle,
321 .gru_int_req_bits = XLT_GRU_INT_REQ_BITS
325 /* No alpha_mv alias for XLT, since we compile it in unconditionally
326 with ALCOR; setup_arch knows how to cope. */