2 * linux/arch/alpha/kernel/sys_rawhide.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 RAWHIDE.
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>
18 #include <asm/ptrace.h>
19 #include <asm/system.h>
22 #include <asm/mmu_context.h>
24 #include <asm/pgtable.h>
25 #include <asm/core_mcpcia.h>
26 #include <asm/tlbflush.h>
31 #include "machvec_impl.h"
35 * HACK ALERT! only the boot cpu is used for interrupts.
39 /* Note mask bit is true for ENABLED irqs. */
41 static unsigned int hose_irq_masks[4] = {
42 0xff0000, 0xfe0000, 0xff0000, 0xff0000
44 static unsigned int cached_irq_masks[4];
45 DEFINE_SPINLOCK(rawhide_irq_lock);
48 rawhide_update_irq_hw(int hose, int mask)
50 *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose)) = mask;
52 *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose));
55 #define hose_exists(h) \
56 (((h) < MCPCIA_MAX_HOSES) && (cached_irq_masks[(h)] != 0))
59 rawhide_enable_irq(unsigned int irq)
61 unsigned int mask, hose;
65 if (!hose_exists(hose)) /* if hose non-existent, exit */
71 spin_lock(&rawhide_irq_lock);
72 mask |= cached_irq_masks[hose];
73 cached_irq_masks[hose] = mask;
74 rawhide_update_irq_hw(hose, mask);
75 spin_unlock(&rawhide_irq_lock);
79 rawhide_disable_irq(unsigned int irq)
81 unsigned int mask, hose;
85 if (!hose_exists(hose)) /* if hose non-existent, exit */
89 mask = ~(1 << irq) | hose_irq_masks[hose];
91 spin_lock(&rawhide_irq_lock);
92 mask &= cached_irq_masks[hose];
93 cached_irq_masks[hose] = mask;
94 rawhide_update_irq_hw(hose, mask);
95 spin_unlock(&rawhide_irq_lock);
99 rawhide_mask_and_ack_irq(unsigned int irq)
101 unsigned int mask, mask1, hose;
105 if (!hose_exists(hose)) /* if hose non-existent, exit */
110 mask = ~mask1 | hose_irq_masks[hose];
112 spin_lock(&rawhide_irq_lock);
114 mask &= cached_irq_masks[hose];
115 cached_irq_masks[hose] = mask;
116 rawhide_update_irq_hw(hose, mask);
118 /* Clear the interrupt. */
119 *(vuip)MCPCIA_INT_REQ(MCPCIA_HOSE2MID(hose)) = mask1;
121 spin_unlock(&rawhide_irq_lock);
125 rawhide_startup_irq(unsigned int irq)
127 rawhide_enable_irq(irq);
132 rawhide_end_irq(unsigned int irq)
134 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
135 rawhide_enable_irq(irq);
138 static struct irq_chip rawhide_irq_type = {
140 .startup = rawhide_startup_irq,
141 .shutdown = rawhide_disable_irq,
142 .enable = rawhide_enable_irq,
143 .disable = rawhide_disable_irq,
144 .ack = rawhide_mask_and_ack_irq,
145 .end = rawhide_end_irq,
149 rawhide_srm_device_interrupt(unsigned long vector)
153 irq = (vector - 0x800) >> 4;
156 * The RAWHIDE SRM console reports PCI interrupts with a vector
157 * 0x80 *higher* than one might expect, as PCI IRQ 0 (ie bit 0)
158 * shows up as IRQ 24, etc, etc. We adjust it down by 8 to have
159 * it line up with the actual bit numbers from the REQ registers,
160 * which is how we manage the interrupts/mask. Sigh...
162 * Also, PCI #1 interrupts are offset some more... :-(
166 /* SCSI on PCI1 is special. */
170 /* Adjust by which hose it is from. */
171 irq -= ((irq + 16) >> 2) & 0x38;
177 rawhide_init_irq(void)
179 struct pci_controller *hose;
184 /* Clear them all; only hoses that exist will be non-zero. */
185 for (i = 0; i < MCPCIA_MAX_HOSES; i++) cached_irq_masks[i] = 0;
187 for (hose = hose_head; hose; hose = hose->next) {
188 unsigned int h = hose->index;
189 unsigned int mask = hose_irq_masks[h];
191 cached_irq_masks[h] = mask;
192 *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(h)) = mask;
193 *(vuip)MCPCIA_INT_MASK1(MCPCIA_HOSE2MID(h)) = 0;
196 for (i = 16; i < 128; ++i) {
197 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
198 irq_desc[i].chip = &rawhide_irq_type;
202 common_init_isa_dma();
206 * PCI Fixup configuration.
208 * Summary @ MCPCIA_PCI0_INT_REQ:
210 * 0 Interrupt Line A from slot 2 PCI0
211 * 1 Interrupt Line B from slot 2 PCI0
212 * 2 Interrupt Line C from slot 2 PCI0
213 * 3 Interrupt Line D from slot 2 PCI0
214 * 4 Interrupt Line A from slot 3 PCI0
215 * 5 Interrupt Line B from slot 3 PCI0
216 * 6 Interrupt Line C from slot 3 PCI0
217 * 7 Interrupt Line D from slot 3 PCI0
218 * 8 Interrupt Line A from slot 4 PCI0
219 * 9 Interrupt Line B from slot 4 PCI0
220 * 10 Interrupt Line C from slot 4 PCI0
221 * 11 Interrupt Line D from slot 4 PCI0
222 * 12 Interrupt Line A from slot 5 PCI0
223 * 13 Interrupt Line B from slot 5 PCI0
224 * 14 Interrupt Line C from slot 5 PCI0
225 * 15 Interrupt Line D from slot 5 PCI0
226 * 16 EISA interrupt (PCI 0) or SCSI interrupt (PCI 1)
230 * 1 EISA bridge (PCI bus 0 only)
231 * 2 PCI option slot 2
232 * 3 PCI option slot 3
233 * 4 PCI option slot 4
234 * 5 PCI option slot 5
239 rawhide_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
241 static char irq_tab[5][5] __initdata = {
242 /*INT INTA INTB INTC INTD */
243 { 16+16, 16+16, 16+16, 16+16, 16+16}, /* IdSel 1 SCSI PCI 1 */
244 { 16+ 0, 16+ 0, 16+ 1, 16+ 2, 16+ 3}, /* IdSel 2 slot 2 */
245 { 16+ 4, 16+ 4, 16+ 5, 16+ 6, 16+ 7}, /* IdSel 3 slot 3 */
246 { 16+ 8, 16+ 8, 16+ 9, 16+10, 16+11}, /* IdSel 4 slot 4 */
247 { 16+12, 16+12, 16+13, 16+14, 16+15} /* IdSel 5 slot 5 */
249 const long min_idsel = 1, max_idsel = 5, irqs_per_slot = 5;
251 struct pci_controller *hose = dev->sysdata;
252 int irq = COMMON_TABLE_LOOKUP;
254 irq += 24 * hose->index;
263 struct alpha_machine_vector rawhide_mv __initmv = {
264 .vector_name = "Rawhide",
268 .machine_check = mcpcia_machine_check,
269 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
270 .min_io_address = DEFAULT_IO_BASE,
271 .min_mem_address = MCPCIA_DEFAULT_MEM_BASE,
272 .pci_dac_offset = MCPCIA_DAC_OFFSET,
275 .device_interrupt = rawhide_srm_device_interrupt,
277 .init_arch = mcpcia_init_arch,
278 .init_irq = rawhide_init_irq,
279 .init_rtc = common_init_rtc,
280 .init_pci = common_init_pci,
282 .pci_map_irq = rawhide_map_irq,
283 .pci_swizzle = common_swizzle,