ia64/linux-2.6.18-xen.hg

view arch/alpha/kernel/sys_rx164.c @ 0:831230e53067

Import 2.6.18 from kernel.org tarball.
author Ian Campbell <ian.campbell@xensource.com>
date Wed Apr 11 14:15:44 2007 +0100 (2007-04-11)
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1 /*
2 * linux/arch/alpha/kernel/sys_rx164.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 RX164 (PCA56+POLARIS).
9 */
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 #include <linux/bitops.h>
19 #include <asm/ptrace.h>
20 #include <asm/system.h>
21 #include <asm/dma.h>
22 #include <asm/irq.h>
23 #include <asm/mmu_context.h>
24 #include <asm/io.h>
25 #include <asm/pgtable.h>
26 #include <asm/core_polaris.h>
27 #include <asm/tlbflush.h>
29 #include "proto.h"
30 #include "irq_impl.h"
31 #include "pci_impl.h"
32 #include "machvec_impl.h"
35 /* Note mask bit is true for ENABLED irqs. */
36 static unsigned long cached_irq_mask;
38 static inline void
39 rx164_update_irq_hw(unsigned long mask)
40 {
41 volatile unsigned int *irq_mask;
43 irq_mask = (void *)(POLARIS_DENSE_CONFIG_BASE + 0x74);
44 *irq_mask = mask;
45 mb();
46 *irq_mask;
47 }
49 static inline void
50 rx164_enable_irq(unsigned int irq)
51 {
52 rx164_update_irq_hw(cached_irq_mask |= 1UL << (irq - 16));
53 }
55 static void
56 rx164_disable_irq(unsigned int irq)
57 {
58 rx164_update_irq_hw(cached_irq_mask &= ~(1UL << (irq - 16)));
59 }
61 static unsigned int
62 rx164_startup_irq(unsigned int irq)
63 {
64 rx164_enable_irq(irq);
65 return 0;
66 }
68 static void
69 rx164_end_irq(unsigned int irq)
70 {
71 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
72 rx164_enable_irq(irq);
73 }
75 static struct hw_interrupt_type rx164_irq_type = {
76 .typename = "RX164",
77 .startup = rx164_startup_irq,
78 .shutdown = rx164_disable_irq,
79 .enable = rx164_enable_irq,
80 .disable = rx164_disable_irq,
81 .ack = rx164_disable_irq,
82 .end = rx164_end_irq,
83 };
85 static void
86 rx164_device_interrupt(unsigned long vector, struct pt_regs *regs)
87 {
88 unsigned long pld;
89 volatile unsigned int *dirr;
90 long i;
92 /* Read the interrupt summary register. On Polaris, this is
93 the DIRR register in PCI config space (offset 0x84). */
94 dirr = (void *)(POLARIS_DENSE_CONFIG_BASE + 0x84);
95 pld = *dirr;
97 /*
98 * Now for every possible bit set, work through them and call
99 * the appropriate interrupt handler.
100 */
101 while (pld) {
102 i = ffz(~pld);
103 pld &= pld - 1; /* clear least bit set */
104 if (i == 20) {
105 isa_no_iack_sc_device_interrupt(vector, regs);
106 } else {
107 handle_irq(16+i, regs);
108 }
109 }
110 }
112 static void __init
113 rx164_init_irq(void)
114 {
115 long i;
117 rx164_update_irq_hw(0);
118 for (i = 16; i < 40; ++i) {
119 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
120 irq_desc[i].chip = &rx164_irq_type;
121 }
123 init_i8259a_irqs();
124 common_init_isa_dma();
126 setup_irq(16+20, &isa_cascade_irqaction);
127 }
130 /*
131 * The RX164 changed its interrupt routing between pass1 and pass2...
132 *
133 * PASS1:
134 *
135 * Slot IDSEL INTA INTB INTC INTD
136 * 0 6 5 10 15 20
137 * 1 7 4 9 14 19
138 * 2 5 3 8 13 18
139 * 3 9 2 7 12 17
140 * 4 10 1 6 11 16
141 *
142 * PASS2:
143 * Slot IDSEL INTA INTB INTC INTD
144 * 0 5 1 7 12 17
145 * 1 6 2 8 13 18
146 * 2 8 3 9 14 19
147 * 3 9 4 10 15 20
148 * 4 10 5 11 16 6
149 *
150 */
152 /*
153 * IdSel
154 * 5 32 bit PCI option slot 0
155 * 6 64 bit PCI option slot 1
156 * 7 PCI-ISA bridge
157 * 7 64 bit PCI option slot 2
158 * 9 32 bit PCI option slot 3
159 * 10 PCI-PCI bridge
160 *
161 */
163 static int __init
164 rx164_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
165 {
166 #if 0
167 static char irq_tab_pass1[6][5] __initdata = {
168 /*INT INTA INTB INTC INTD */
169 { 16+3, 16+3, 16+8, 16+13, 16+18}, /* IdSel 5, slot 2 */
170 { 16+5, 16+5, 16+10, 16+15, 16+20}, /* IdSel 6, slot 0 */
171 { 16+4, 16+4, 16+9, 16+14, 16+19}, /* IdSel 7, slot 1 */
172 { -1, -1, -1, -1, -1}, /* IdSel 8, PCI/ISA bridge */
173 { 16+2, 16+2, 16+7, 16+12, 16+17}, /* IdSel 9, slot 3 */
174 { 16+1, 16+1, 16+6, 16+11, 16+16}, /* IdSel 10, slot 4 */
175 };
176 #else
177 static char irq_tab[6][5] __initdata = {
178 /*INT INTA INTB INTC INTD */
179 { 16+0, 16+0, 16+6, 16+11, 16+16}, /* IdSel 5, slot 0 */
180 { 16+1, 16+1, 16+7, 16+12, 16+17}, /* IdSel 6, slot 1 */
181 { -1, -1, -1, -1, -1}, /* IdSel 7, PCI/ISA bridge */
182 { 16+2, 16+2, 16+8, 16+13, 16+18}, /* IdSel 8, slot 2 */
183 { 16+3, 16+3, 16+9, 16+14, 16+19}, /* IdSel 9, slot 3 */
184 { 16+4, 16+4, 16+10, 16+15, 16+5}, /* IdSel 10, PCI-PCI */
185 };
186 #endif
187 const long min_idsel = 5, max_idsel = 10, irqs_per_slot = 5;
189 /* JRP - Need to figure out how to distinguish pass1 from pass2,
190 and use the correct table. */
191 return COMMON_TABLE_LOOKUP;
192 }
195 /*
196 * The System Vector
197 */
199 struct alpha_machine_vector rx164_mv __initmv = {
200 .vector_name = "RX164",
201 DO_EV5_MMU,
202 DO_DEFAULT_RTC,
203 DO_POLARIS_IO,
204 .machine_check = polaris_machine_check,
205 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
206 .min_io_address = DEFAULT_IO_BASE,
207 .min_mem_address = DEFAULT_MEM_BASE,
209 .nr_irqs = 40,
210 .device_interrupt = rx164_device_interrupt,
212 .init_arch = polaris_init_arch,
213 .init_irq = rx164_init_irq,
214 .init_rtc = common_init_rtc,
215 .init_pci = common_init_pci,
216 .kill_arch = NULL,
217 .pci_map_irq = rx164_map_irq,
218 .pci_swizzle = common_swizzle,
219 };
220 ALIAS_MV(rx164)