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-rw-r--r--arch/ppc64/kernel/spider-pic.c191
1 files changed, 191 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/spider-pic.c b/arch/ppc64/kernel/spider-pic.c
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index 00000000000..d5c9a02fb11
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+++ b/arch/ppc64/kernel/spider-pic.c
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1/*
2 * External Interrupt Controller on Spider South Bridge
3 *
4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
5 *
6 * Author: Arnd Bergmann <arndb@de.ibm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23#include <linux/interrupt.h>
24#include <linux/irq.h>
25
26#include <asm/pgtable.h>
27#include <asm/prom.h>
28#include <asm/io.h>
29
30#include "bpa_iic.h"
31
32/* register layout taken from Spider spec, table 7.4-4 */
33enum {
34 TIR_DEN = 0x004, /* Detection Enable Register */
35 TIR_MSK = 0x084, /* Mask Level Register */
36 TIR_EDC = 0x0c0, /* Edge Detection Clear Register */
37 TIR_PNDA = 0x100, /* Pending Register A */
38 TIR_PNDB = 0x104, /* Pending Register B */
39 TIR_CS = 0x144, /* Current Status Register */
40 TIR_LCSA = 0x150, /* Level Current Status Register A */
41 TIR_LCSB = 0x154, /* Level Current Status Register B */
42 TIR_LCSC = 0x158, /* Level Current Status Register C */
43 TIR_LCSD = 0x15c, /* Level Current Status Register D */
44 TIR_CFGA = 0x200, /* Setting Register A0 */
45 TIR_CFGB = 0x204, /* Setting Register B0 */
46 /* 0x208 ... 0x3ff Setting Register An/Bn */
47 TIR_PPNDA = 0x400, /* Packet Pending Register A */
48 TIR_PPNDB = 0x404, /* Packet Pending Register B */
49 TIR_PIERA = 0x408, /* Packet Output Error Register A */
50 TIR_PIERB = 0x40c, /* Packet Output Error Register B */
51 TIR_PIEN = 0x444, /* Packet Output Enable Register */
52 TIR_PIPND = 0x454, /* Packet Output Pending Register */
53 TIRDID = 0x484, /* Spider Device ID Register */
54 REISTIM = 0x500, /* Reissue Command Timeout Time Setting */
55 REISTIMEN = 0x504, /* Reissue Command Timeout Setting */
56 REISWAITEN = 0x508, /* Reissue Wait Control*/
57};
58
59static void __iomem *spider_pics[4];
60
61static void __iomem *spider_get_pic(int irq)
62{
63 int node = irq / IIC_NODE_STRIDE;
64 irq %= IIC_NODE_STRIDE;
65
66 if (irq >= IIC_EXT_OFFSET &&
67 irq < IIC_EXT_OFFSET + IIC_NUM_EXT &&
68 spider_pics)
69 return spider_pics[node];
70 return NULL;
71}
72
73static int spider_get_nr(unsigned int irq)
74{
75 return (irq % IIC_NODE_STRIDE) - IIC_EXT_OFFSET;
76}
77
78static void __iomem *spider_get_irq_config(int irq)
79{
80 void __iomem *pic;
81 pic = spider_get_pic(irq);
82 return pic + TIR_CFGA + 8 * spider_get_nr(irq);
83}
84
85static void spider_enable_irq(unsigned int irq)
86{
87 void __iomem *cfg = spider_get_irq_config(irq);
88 irq = spider_get_nr(irq);
89
90 out_be32(cfg, in_be32(cfg) | 0x3107000eu);
91 out_be32(cfg + 4, in_be32(cfg + 4) | 0x00020000u | irq);
92}
93
94static void spider_disable_irq(unsigned int irq)
95{
96 void __iomem *cfg = spider_get_irq_config(irq);
97 irq = spider_get_nr(irq);
98
99 out_be32(cfg, in_be32(cfg) & ~0x30000000u);
100}
101
102static unsigned int spider_startup_irq(unsigned int irq)
103{
104 spider_enable_irq(irq);
105 return 0;
106}
107
108static void spider_shutdown_irq(unsigned int irq)
109{
110 spider_disable_irq(irq);
111}
112
113static void spider_end_irq(unsigned int irq)
114{
115 spider_enable_irq(irq);
116}
117
118static void spider_ack_irq(unsigned int irq)
119{
120 spider_disable_irq(irq);
121 iic_local_enable();
122}
123
124static struct hw_interrupt_type spider_pic = {
125 .typename = " SPIDER ",
126 .startup = spider_startup_irq,
127 .shutdown = spider_shutdown_irq,
128 .enable = spider_enable_irq,
129 .disable = spider_disable_irq,
130 .ack = spider_ack_irq,
131 .end = spider_end_irq,
132};
133
134
135int spider_get_irq(unsigned long int_pending)
136{
137 void __iomem *regs = spider_get_pic(int_pending);
138 unsigned long cs;
139 int irq;
140
141 cs = in_be32(regs + TIR_CS);
142
143 irq = cs >> 24;
144 if (irq != 63)
145 return irq;
146
147 return -1;
148}
149
150void spider_init_IRQ(void)
151{
152 int node;
153 struct device_node *dn;
154 unsigned int *property;
155 long spiderpic;
156 int n;
157
158/* FIXME: detect multiple PICs as soon as the device tree has them */
159 for (node = 0; node < 1; node++) {
160 dn = of_find_node_by_path("/");
161 n = prom_n_addr_cells(dn);
162 property = (unsigned int *) get_property(dn,
163 "platform-spider-pic", NULL);
164
165 if (!property)
166 continue;
167 for (spiderpic = 0; n > 0; --n)
168 spiderpic = (spiderpic << 32) + *property++;
169 printk(KERN_DEBUG "SPIDER addr: %lx\n", spiderpic);
170 spider_pics[node] = __ioremap(spiderpic, 0x800, _PAGE_NO_CACHE);
171 for (n = 0; n < IIC_NUM_EXT; n++) {
172 int irq = n + IIC_EXT_OFFSET + node * IIC_NODE_STRIDE;
173 get_irq_desc(irq)->handler = &spider_pic;
174
175 /* do not mask any interrupts because of level */
176 out_be32(spider_pics[node] + TIR_MSK, 0x0);
177
178 /* disable edge detection clear */
179 /* out_be32(spider_pics[node] + TIR_EDC, 0x0); */
180
181 /* enable interrupt packets to be output */
182 out_be32(spider_pics[node] + TIR_PIEN,
183 in_be32(spider_pics[node] + TIR_PIEN) | 0x1);
184
185 /* Enable the interrupt detection enable bit. Do this last! */
186 out_be32(spider_pics[node] + TIR_DEN,
187 in_be32(spider_pics[node] +TIR_DEN) | 0x1);
188
189 }
190 }
191}