Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Interrupt management for most GSC and related devices. | |
3 | * | |
4 | * (c) Copyright 1999 Alex deVries for The Puffin Group | |
5 | * (c) Copyright 1999 Grant Grundler for Hewlett-Packard | |
6 | * (c) Copyright 1999 Matthew Wilcox | |
7 | * (c) Copyright 2000 Helge Deller | |
8 | * (c) Copyright 2001 Matthew Wilcox for Hewlett-Packard | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/bitops.h> | |
1da177e4 LT |
17 | #include <linux/errno.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/ioport.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/types.h> | |
24 | ||
25 | #include <asm/hardware.h> | |
26 | #include <asm/io.h> | |
27 | ||
28 | #include "gsc.h" | |
29 | ||
30 | #undef DEBUG | |
31 | ||
32 | #ifdef DEBUG | |
33 | #define DEBPRINTK printk | |
34 | #else | |
35 | #define DEBPRINTK(x,...) | |
36 | #endif | |
37 | ||
38 | int gsc_alloc_irq(struct gsc_irq *i) | |
39 | { | |
40 | int irq = txn_alloc_irq(GSC_EIM_WIDTH); | |
41 | if (irq < 0) { | |
42 | printk("cannot get irq\n"); | |
43 | return irq; | |
44 | } | |
45 | ||
46 | i->txn_addr = txn_alloc_addr(irq); | |
47 | i->txn_data = txn_alloc_data(irq); | |
48 | i->irq = irq; | |
49 | ||
50 | return irq; | |
51 | } | |
52 | ||
53 | int gsc_claim_irq(struct gsc_irq *i, int irq) | |
54 | { | |
55 | int c = irq; | |
56 | ||
57 | irq += CPU_IRQ_BASE; /* virtualize the IRQ first */ | |
58 | ||
59 | irq = txn_claim_irq(irq); | |
60 | if (irq < 0) { | |
61 | printk("cannot claim irq %d\n", c); | |
62 | return irq; | |
63 | } | |
64 | ||
65 | i->txn_addr = txn_alloc_addr(irq); | |
66 | i->txn_data = txn_alloc_data(irq); | |
67 | i->irq = irq; | |
68 | ||
69 | return irq; | |
70 | } | |
71 | ||
72 | EXPORT_SYMBOL(gsc_alloc_irq); | |
73 | EXPORT_SYMBOL(gsc_claim_irq); | |
74 | ||
75 | /* Common interrupt demultiplexer used by Asp, Lasi & Wax. */ | |
7d12e780 | 76 | irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev) |
1da177e4 LT |
77 | { |
78 | unsigned long irr; | |
79 | struct gsc_asic *gsc_asic = dev; | |
80 | ||
81 | irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR); | |
82 | if (irr == 0) | |
83 | return IRQ_NONE; | |
84 | ||
85 | DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr); | |
86 | ||
87 | do { | |
88 | int local_irq = __ffs(irr); | |
89 | unsigned int irq = gsc_asic->global_irq[local_irq]; | |
7d12e780 | 90 | __do_IRQ(irq); |
1da177e4 LT |
91 | irr &= ~(1 << local_irq); |
92 | } while (irr); | |
93 | ||
94 | return IRQ_HANDLED; | |
95 | } | |
96 | ||
97 | int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit) | |
98 | { | |
99 | int local_irq; | |
100 | ||
101 | for (local_irq = 0; local_irq < limit; local_irq++) { | |
102 | if (global_irqs[local_irq] == irq) | |
103 | return local_irq; | |
104 | } | |
105 | ||
106 | return NO_IRQ; | |
107 | } | |
108 | ||
109 | static void gsc_asic_disable_irq(unsigned int irq) | |
110 | { | |
08678b08 YL |
111 | struct irq_desc *desc = irq_to_desc(irq); |
112 | struct gsc_asic *irq_dev = desc->chip_data; | |
1da177e4 LT |
113 | int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32); |
114 | u32 imr; | |
115 | ||
a8043ecb | 116 | DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq, |
1da177e4 LT |
117 | irq_dev->name, imr); |
118 | ||
119 | /* Disable the IRQ line by clearing the bit in the IMR */ | |
120 | imr = gsc_readl(irq_dev->hpa + OFFSET_IMR); | |
121 | imr &= ~(1 << local_irq); | |
122 | gsc_writel(imr, irq_dev->hpa + OFFSET_IMR); | |
123 | } | |
124 | ||
125 | static void gsc_asic_enable_irq(unsigned int irq) | |
126 | { | |
08678b08 YL |
127 | struct irq_desc *desc = irq_to_desc(irq); |
128 | struct gsc_asic *irq_dev = desc->chip_data; | |
1da177e4 LT |
129 | int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32); |
130 | u32 imr; | |
131 | ||
a8043ecb | 132 | DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq, |
1da177e4 LT |
133 | irq_dev->name, imr); |
134 | ||
135 | /* Enable the IRQ line by setting the bit in the IMR */ | |
136 | imr = gsc_readl(irq_dev->hpa + OFFSET_IMR); | |
137 | imr |= 1 << local_irq; | |
138 | gsc_writel(imr, irq_dev->hpa + OFFSET_IMR); | |
139 | /* | |
140 | * FIXME: read IPR to make sure the IRQ isn't already pending. | |
141 | * If so, we need to read IRR and manually call do_irq(). | |
142 | */ | |
143 | } | |
144 | ||
145 | static unsigned int gsc_asic_startup_irq(unsigned int irq) | |
146 | { | |
147 | gsc_asic_enable_irq(irq); | |
148 | return 0; | |
149 | } | |
150 | ||
dfe07565 | 151 | static struct irq_chip gsc_asic_interrupt_type = { |
1da177e4 LT |
152 | .typename = "GSC-ASIC", |
153 | .startup = gsc_asic_startup_irq, | |
154 | .shutdown = gsc_asic_disable_irq, | |
155 | .enable = gsc_asic_enable_irq, | |
156 | .disable = gsc_asic_disable_irq, | |
157 | .ack = no_ack_irq, | |
158 | .end = no_end_irq, | |
159 | }; | |
160 | ||
dfe07565 | 161 | int gsc_assign_irq(struct irq_chip *type, void *data) |
1da177e4 LT |
162 | { |
163 | static int irq = GSC_IRQ_BASE; | |
08678b08 | 164 | struct irq_desc *desc; |
1da177e4 LT |
165 | |
166 | if (irq > GSC_IRQ_MAX) | |
167 | return NO_IRQ; | |
168 | ||
08678b08 YL |
169 | desc = irq_to_desc(irq); |
170 | desc->chip = type; | |
171 | desc->chip_data = data; | |
1da177e4 LT |
172 | return irq++; |
173 | } | |
174 | ||
175 | void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp) | |
176 | { | |
177 | int irq = asic->global_irq[local_irq]; | |
178 | ||
179 | if (irq <= 0) { | |
180 | irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic); | |
181 | if (irq == NO_IRQ) | |
182 | return; | |
183 | ||
184 | asic->global_irq[local_irq] = irq; | |
185 | } | |
186 | *irqp = irq; | |
187 | } | |
188 | ||
bfe4f4f8 JB |
189 | struct gsc_fixup_struct { |
190 | void (*choose_irq)(struct parisc_device *, void *); | |
191 | void *ctrl; | |
192 | }; | |
193 | ||
194 | static int gsc_fixup_irqs_callback(struct device *dev, void *data) | |
56583747 | 195 | { |
bfe4f4f8 JB |
196 | struct parisc_device *padev = to_parisc_device(dev); |
197 | struct gsc_fixup_struct *gf = data; | |
198 | ||
199 | /* work-around for 715/64 and others which have parent | |
200 | at path [5] and children at path [5/0/x] */ | |
201 | if (padev->id.hw_type == HPHW_FAULTY) | |
202 | gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq); | |
203 | gf->choose_irq(padev, gf->ctrl); | |
204 | ||
205 | return 0; | |
56583747 MW |
206 | } |
207 | ||
1da177e4 LT |
208 | void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl, |
209 | void (*choose_irq)(struct parisc_device *, void *)) | |
210 | { | |
bfe4f4f8 JB |
211 | struct gsc_fixup_struct data = { |
212 | .choose_irq = choose_irq, | |
213 | .ctrl = ctrl, | |
214 | }; | |
215 | ||
216 | device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback); | |
1da177e4 LT |
217 | } |
218 | ||
219 | int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic) | |
220 | { | |
221 | struct resource *res; | |
222 | int i; | |
223 | ||
224 | gsc_asic->gsc = parent; | |
225 | ||
226 | /* Initialise local irq -> global irq mapping */ | |
227 | for (i = 0; i < 32; i++) { | |
228 | gsc_asic->global_irq[i] = NO_IRQ; | |
229 | } | |
230 | ||
231 | /* allocate resource region */ | |
232 | res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name); | |
233 | if (res) { | |
234 | res->flags = IORESOURCE_MEM; /* do not mark it busy ! */ | |
235 | } | |
236 | ||
237 | #if 0 | |
238 | printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name, | |
239 | parent->irq, gsc_asic->eim); | |
240 | if (gsc_readl(gsc_asic->hpa + OFFSET_IMR)) | |
241 | printk(" IMR is non-zero! (0x%x)", | |
242 | gsc_readl(gsc_asic->hpa + OFFSET_IMR)); | |
243 | printk("\n"); | |
244 | #endif | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | extern struct parisc_driver lasi_driver; | |
250 | extern struct parisc_driver asp_driver; | |
251 | extern struct parisc_driver wax_driver; | |
252 | ||
253 | void __init gsc_init(void) | |
254 | { | |
255 | #ifdef CONFIG_GSC_LASI | |
256 | register_parisc_driver(&lasi_driver); | |
257 | register_parisc_driver(&asp_driver); | |
258 | #endif | |
259 | #ifdef CONFIG_GSC_WAX | |
260 | register_parisc_driver(&wax_driver); | |
261 | #endif | |
262 | } |