aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/cell/spider-pic.c
blob: 9647a8dad4fe4af995f6a83a5a4800ac96b1d8fa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
/*
 * External Interrupt Controller on Spider South Bridge
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
 *
 * Author: Arnd Bergmann <arndb@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/interrupt.h>
#include <linux/irq.h>

#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/io.h>

#include "interrupt.h"

/* register layout taken from Spider spec, table 7.4-4 */
enum {
	TIR_DEN		= 0x004, /* Detection Enable Register */
	TIR_MSK		= 0x084, /* Mask Level Register */
	TIR_EDC		= 0x0c0, /* Edge Detection Clear Register */
	TIR_PNDA	= 0x100, /* Pending Register A */
	TIR_PNDB	= 0x104, /* Pending Register B */
	TIR_CS		= 0x144, /* Current Status Register */
	TIR_LCSA	= 0x150, /* Level Current Status Register A */
	TIR_LCSB	= 0x154, /* Level Current Status Register B */
	TIR_LCSC	= 0x158, /* Level Current Status Register C */
	TIR_LCSD	= 0x15c, /* Level Current Status Register D */
	TIR_CFGA	= 0x200, /* Setting Register A0 */
	TIR_CFGB	= 0x204, /* Setting Register B0 */
			/* 0x208 ... 0x3ff Setting Register An/Bn */
	TIR_PPNDA	= 0x400, /* Packet Pending Register A */
	TIR_PPNDB	= 0x404, /* Packet Pending Register B */
	TIR_PIERA	= 0x408, /* Packet Output Error Register A */
	TIR_PIERB	= 0x40c, /* Packet Output Error Register B */
	TIR_PIEN	= 0x444, /* Packet Output Enable Register */
	TIR_PIPND	= 0x454, /* Packet Output Pending Register */
	TIRDID		= 0x484, /* Spider Device ID Register */
	REISTIM		= 0x500, /* Reissue Command Timeout Time Setting */
	REISTIMEN	= 0x504, /* Reissue Command Timeout Setting */
	REISWAITEN	= 0x508, /* Reissue Wait Control*/
};

static void __iomem *spider_pics[4];

static void __iomem *spider_get_pic(int irq)
{
	int node = irq / IIC_NODE_STRIDE;
	irq %= IIC_NODE_STRIDE;

	if (irq >= IIC_EXT_OFFSET &&
	    irq < IIC_EXT_OFFSET + IIC_NUM_EXT &&
	    spider_pics)
		return spider_pics[node];
	return NULL;
}

static int spider_get_nr(unsigned int irq)
{
	return (irq % IIC_NODE_STRIDE) - IIC_EXT_OFFSET;
}

static void __iomem *spider_get_irq_config(int irq)
{
	void __iomem *pic;
	pic = spider_get_pic(irq);
	return pic + TIR_CFGA + 8 * spider_get_nr(irq);
}

static void spider_enable_irq(unsigned int irq)
{
	int nodeid = (irq / IIC_NODE_STRIDE) * 0x10;
	void __iomem *cfg = spider_get_irq_config(irq);
	irq = spider_get_nr(irq);

	out_be32(cfg, (in_be32(cfg) & ~0xf0)| 0x3107000eu | nodeid);
	out_be32(cfg + 4, in_be32(cfg + 4) | 0x00020000u | irq);
}

static void spider_disable_irq(unsigned int irq)
{
	void __iomem *cfg = spider_get_irq_config(irq);
	irq = spider_get_nr(irq);

	out_be32(cfg, in_be32(cfg) & ~0x30000000u);
}

static unsigned int spider_startup_irq(unsigned int irq)
{
	spider_enable_irq(irq);
	return 0;
}

static void spider_shutdown_irq(unsigned int irq)
{
	spider_disable_irq(irq);
}

static void spider_end_irq(unsigned int irq)
{
	spider_enable_irq(irq);
}

static void spider_ack_irq(unsigned int irq)
{
	spider_disable_irq(irq);
	iic_local_enable();
}

static struct hw_interrupt_type spider_pic = {
	.typename = " SPIDER   ",
	.startup = spider_startup_irq,
	.shutdown = spider_shutdown_irq,
	.enable = spider_enable_irq,
	.disable = spider_disable_irq,
	.ack = spider_ack_irq,
	.end = spider_end_irq,
};

int spider_get_irq(int node)
{
	unsigned long cs;
	void __iomem *regs = spider_pics[node];

	cs = in_be32(regs + TIR_CS) >> 24;

	if (cs == 63)
		return -1;
	else
		return cs;
}

/* hardcoded part to be compatible with older firmware */

void spider_init_IRQ_hardcoded(void)
{
	int node;
	long spiderpic;
	long pics[] = { 0x24000008000, 0x34000008000 };
	int n;

	pr_debug("%s(%d): Using hardcoded defaults\n", __FUNCTION__, __LINE__);

	for (node = 0; node < num_present_cpus()/2; node++) {
		spiderpic = pics[node];
		printk(KERN_DEBUG "SPIDER addr: %lx\n", spiderpic);
		spider_pics[node] = __ioremap(spiderpic, 0x800, _PAGE_NO_CACHE);
		for (n = 0; n < IIC_NUM_EXT; n++) {
			int irq = n + IIC_EXT_OFFSET + node * IIC_NODE_STRIDE;
			get_irq_desc(irq)->handler = &spider_pic;
		}

 		/* do not mask any interrupts because of level */
 		out_be32(spider_pics[node] + TIR_MSK, 0x0);

 		/* disable edge detection clear */
 		/* out_be32(spider_pics[node] + TIR_EDC, 0x0); */

 		/* enable interrupt packets to be output */
 		out_be32(spider_pics[node] + TIR_PIEN,
			in_be32(spider_pics[node] + TIR_PIEN) | 0x1);

 		/* Enable the interrupt detection enable bit. Do this last! */
 		out_be32(spider_pics[node] + TIR_DEN,
			in_be32(spider_pics[node] + TIR_DEN) | 0x1);
	}
}

void spider_init_IRQ(void)
{
	long spider_reg;
	struct device_node *dn;
	char *compatible;
	int n, node = 0;

	for (dn = NULL; (dn = of_find_node_by_name(dn, "interrupt-controller"));) {
		compatible = (char *)get_property(dn, "compatible", NULL);

		if (!compatible)
			continue;

		if (strstr(compatible, "CBEA,platform-spider-pic"))
			spider_reg = *(long *)get_property(dn,"reg", NULL);
		else if (strstr(compatible, "sti,platform-spider-pic")) {
			spider_init_IRQ_hardcoded();
			return;
		} else
			continue;

		if (!spider_reg)
			printk("interrupt controller does not have reg property !\n");

		n = prom_n_addr_cells(dn);

		if ( n != 2)
			printk("reg property with invalid number of elements \n");

		spider_pics[node] = __ioremap(spider_reg, 0x800, _PAGE_NO_CACHE);

		printk("SPIDER addr: %lx with %i addr_cells mapped to %p\n",
		       spider_reg, n, spider_pics[node]);

		for (n = 0; n < IIC_NUM_EXT; n++) {
			int irq = n + IIC_EXT_OFFSET + node * IIC_NODE_STRIDE;
			get_irq_desc(irq)->handler = &spider_pic;
		}

		/* do not mask any interrupts because of level */
		out_be32(spider_pics[node] + TIR_MSK, 0x0);

		/* disable edge detection clear */
		/* out_be32(spider_pics[node] + TIR_EDC, 0x0); */

		/* enable interrupt packets to be output */
		out_be32(spider_pics[node] + TIR_PIEN,
			in_be32(spider_pics[node] + TIR_PIEN) | 0x1);

		/* Enable the interrupt detection enable bit. Do this last! */
		out_be32(spider_pics[node] + TIR_DEN,
			in_be32(spider_pics[node] + TIR_DEN) | 0x1);

		node++;
	}
}

Privacy Policy