aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/sni/pcimt.c
blob: 97b234361b4d0afa8d5c0b64434c2bf07a253292 (plain) (blame)
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
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
/*
 * PCIMT specific code
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1996, 97, 98, 2000, 03, 04, 06 Ralf Baechle (ralf@linux-mips.org)
 * Copyright (C) 2006,2007 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/serial_8250.h>

#include <asm/mc146818-time.h>
#include <asm/sni.h>
#include <asm/time.h>
#include <asm/i8259.h>
#include <asm/irq_cpu.h>

#define cacheconf (*(volatile unsigned int *)PCIMT_CACHECONF)
#define invspace (*(volatile unsigned int *)PCIMT_INVSPACE)

static void __init sni_pcimt_sc_init(void)
{
	unsigned int scsiz, sc_size;

	scsiz = cacheconf & 7;
	if (scsiz == 0) {
		printk("Second level cache is deactived.\n");
		return;
	}
	if (scsiz >= 6) {
		printk("Invalid second level cache size configured, "
		       "deactivating second level cache.\n");
		cacheconf = 0;
		return;
	}

	sc_size = 128 << scsiz;
	printk("%dkb second level cache detected, deactivating.\n", sc_size);
	cacheconf = 0;
}


/*
 * A bit more gossip about the iron we're running on ...
 */
static inline void sni_pcimt_detect(void)
{
	char boardtype[80];
	unsigned char csmsr;
	char *p = boardtype;
	unsigned int asic;

	csmsr = *(volatile unsigned char *)PCIMT_CSMSR;

	p += sprintf(p, "%s PCI", (csmsr & 0x80) ? "RM200" : "RM300");
	if ((csmsr & 0x80) == 0)
		p += sprintf(p, ", board revision %s",
		             (csmsr & 0x20) ? "D" : "C");
	asic = csmsr & 0x80;
	asic = (csmsr & 0x08) ? asic : !asic;
	p += sprintf(p, ", ASIC PCI Rev %s", asic ? "1.0" : "1.1");
	printk("%s.\n", boardtype);
}

#define PORT(_base,_irq)				\
	{						\
		.iobase		= _base,		\
		.irq		= _irq,			\
		.uartclk	= 1843200,		\
		.iotype		= UPIO_PORT,		\
		.flags		= UPF_BOOT_AUTOCONF,	\
	}

static struct plat_serial8250_port pcimt_data[] = {
	PORT(0x3f8, 4),
	PORT(0x2f8, 3),
	{ },
};

static struct platform_device pcimt_serial8250_device = {
	.name			= "serial8250",
	.id			= PLAT8250_DEV_PLATFORM,
	.dev			= {
		.platform_data	= pcimt_data,
	},
};

static struct resource sni_io_resource = {
	.start	= 0x00000000UL,
	.end	= 0x03bfffffUL,
	.name	= "PCIMT IO MEM",
	.flags	= IORESOURCE_IO,
};

static struct resource pcimt_io_resources[] = {
	{
		.start	= 0x00,
		.end	= 0x1f,
		.name	= "dma1",
		.flags	= IORESOURCE_BUSY
	}, {
		.start	=  0x40,
		.end	= 0x5f,
		.name	= "timer",
		.flags	= IORESOURCE_BUSY
	}, {
		.start	=  0x60,
		.end	= 0x6f,
		.name	= "keyboard",
		.flags	= IORESOURCE_BUSY
	}, {
		.start	=  0x80,
		.end	= 0x8f,
		.name	= "dma page reg",
		.flags	= IORESOURCE_BUSY
	}, {
		.start	=  0xc0,
		.end	= 0xdf,
		.name	= "dma2",
		.flags	= IORESOURCE_BUSY
	}, {
		.start	=  0xcfc,
		.end	= 0xcff,
		.name	= "PCI config data",
		.flags	= IORESOURCE_BUSY
	}
};

static struct resource pcimt_mem_resources[] = {
	{
		/*
		 * this region should only be 4 bytes long,
		 * but it's 16MB on all RM300C I've checked
		 */
		.start	= 0x1a000000,
		.end	= 0x1affffff,
		.name	= "PCI INT ACK",
		.flags	= IORESOURCE_BUSY
	}
};

static struct resource sni_mem_resource = {
	.start	= 0x18000000UL,
	.end	= 0x1fbfffffUL,
	.name	= "PCIMT PCI MEM",
	.flags	= IORESOURCE_MEM
};

static void __init sni_pcimt_resource_init(void)
{
	int i;

	/* request I/O space for devices used on all i[345]86 PCs */
	for (i = 0; i < ARRAY_SIZE(pcimt_io_resources); i++)
		request_resource(&sni_io_resource, pcimt_io_resources + i);
	/* request MEM space for devices used on all i[345]86 PCs */
	for (i = 0; i < ARRAY_SIZE(pcimt_mem_resources); i++)
		request_resource(&sni_mem_resource, pcimt_mem_resources + i);
}

extern struct pci_ops sni_pcimt_ops;

static struct pci_controller sni_controller = {
	.pci_ops	= &sni_pcimt_ops,
	.mem_resource	= &sni_mem_resource,
	.mem_offset	= 0x00000000UL,
	.io_resource	= &sni_io_resource,
	.io_offset	= 0x00000000UL,
	.io_map_base    = SNI_PORT_BASE
};

static void enable_pcimt_irq(unsigned int irq)
{
	unsigned int mask = 1 << (irq - PCIMT_IRQ_INT2);

	*(volatile u8 *) PCIMT_IRQSEL |= mask;
}

void disable_pcimt_irq(unsigned int irq)
{
	unsigned int mask = ~(1 << (irq - PCIMT_IRQ_INT2));

	*(volatile u8 *) PCIMT_IRQSEL &= mask;
}

static void end_pcimt_irq(unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		enable_pcimt_irq(irq);
}

static struct irq_chip pcimt_irq_type = {
	.typename = "PCIMT",
	.ack = disable_pcimt_irq,
	.mask = disable_pcimt_irq,
	.mask_ack = disable_pcimt_irq,
	.unmask = enable_pcimt_irq,
	.end = end_pcimt_irq,
};

/*
 * hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
 * button interrupts.  Later ...
 */
static void pcimt_hwint0(void)
{
	panic("Received int0 but no handler yet ...");
}

/*
 * hwint 1 deals with EISA and SCSI interrupts,
 *
 * The EISA_INT bit in CSITPEND is high active, all others are low active.
 */
static void pcimt_hwint1(void)
{
	u8 pend = *(volatile char *)PCIMT_CSITPEND;
	unsigned long flags;

	if (pend & IT_EISA) {
		int irq;
		/*
		 * Note: ASIC PCI's builtin interrupt achknowledge feature is
		 * broken.  Using it may result in loss of some or all i8259
		 * interupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
		 */
		irq = i8259_irq();
		if (unlikely(irq < 0))
			return;

		do_IRQ(irq);
	}

	if (!(pend & IT_SCSI)) {
		flags = read_c0_status();
		clear_c0_status(ST0_IM);
		do_IRQ(PCIMT_IRQ_SCSI);
		write_c0_status(flags);
	}
}

/*
 * hwint 3 should deal with the PCI A - D interrupts,
 */
static void pcimt_hwint3(void)
{
	u8 pend = *(volatile char *)PCIMT_CSITPEND;
	int irq;

	pend &= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
	pend ^= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
	clear_c0_status(IE_IRQ3);
	irq = PCIMT_IRQ_INT2 + ffs(pend) - 1;
	do_IRQ(irq);
	set_c0_status(IE_IRQ3);
}

static void sni_pcimt_hwint(void)
{
	u32 pending = read_c0_cause() & read_c0_status();

	if (pending & C_IRQ5)
		do_IRQ (MIPS_CPU_IRQ_BASE + 7);
	else if (pending & C_IRQ4)
		do_IRQ (MIPS_CPU_IRQ_BASE + 6);
	else if (pending & C_IRQ3)
		pcimt_hwint3();
	else if (pending & C_IRQ1)
		pcimt_hwint1();
	else if (pending & C_IRQ0) {
		pcimt_hwint0();
	}
}

void __init sni_pcimt_irq_init(void)
{
	int i;

	*(volatile u8 *) PCIMT_IRQSEL = IT_ETH | IT_EISA;
	mips_cpu_irq_init();
	/* Actually we've got more interrupts to handle ...  */
	for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_SCSI; i++)
		set_irq_chip(i, &pcimt_irq_type);
	sni_hwint = sni_pcimt_hwint;
	change_c0_status(ST0_IM, IE_IRQ1|IE_IRQ3);
}

void sni_pcimt_init(void)
{
	sni_pcimt_detect();
	sni_pcimt_sc_init();
	rtc_mips_get_time = mc146818_get_cmos_time;
	rtc_mips_set_time = mc146818_set_rtc_mmss;
	board_time_init = sni_cpu_time_init;
	ioport_resource.end = sni_io_resource.end;
#ifdef CONFIG_PCI
	PCIBIOS_MIN_IO = 0x9000;
	register_pci_controller(&sni_controller);
#endif
	sni_pcimt_resource_init();
}

static int __init snirm_pcimt_setup_devinit(void)
{
	switch (sni_brd_type) {
	case SNI_BRD_PCI_MTOWER:
	case SNI_BRD_PCI_DESKTOP:
	case SNI_BRD_PCI_MTOWER_CPLUS:
	        platform_device_register(&pcimt_serial8250_device);
	        break;
	}

	return 0;
}

device_initcall(snirm_pcimt_setup_devinit);