aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-footbridge/common.c
blob: dc09fd200c164543f87f26bb665aa492f3650e65 (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
/*
 *  linux/arch/arm/mach-footbridge/common.c
 *
 *  Copyright (C) 1998-2000 Russell King, Dave Gilbert.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/init.h>
 
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/mach-types.h>
#include <asm/setup.h>
#include <asm/hardware/dec21285.h>

#include <asm/mach/irq.h>
#include <asm/mach/map.h>

#include "common.h"

extern void __init isa_init_irq(unsigned int irq);

unsigned int mem_fclk_21285 = 50000000;

EXPORT_SYMBOL(mem_fclk_21285);

static int __init parse_tag_memclk(const struct tag *tag)
{
	mem_fclk_21285 = tag->u.memclk.fmemclk;
	return 0;
}

__tagtable(ATAG_MEMCLK, parse_tag_memclk);

/*
 * Footbridge IRQ translation table
 *  Converts from our IRQ numbers into FootBridge masks
 */
static const int fb_irq_mask[] = {
	IRQ_MASK_UART_RX,	/*  0 */
	IRQ_MASK_UART_TX,	/*  1 */
	IRQ_MASK_TIMER1,	/*  2 */
	IRQ_MASK_TIMER2,	/*  3 */
	IRQ_MASK_TIMER3,	/*  4 */
	IRQ_MASK_IN0,		/*  5 */
	IRQ_MASK_IN1,		/*  6 */
	IRQ_MASK_IN2,		/*  7 */
	IRQ_MASK_IN3,		/*  8 */
	IRQ_MASK_DOORBELLHOST,	/*  9 */
	IRQ_MASK_DMA1,		/* 10 */
	IRQ_MASK_DMA2,		/* 11 */
	IRQ_MASK_PCI,		/* 12 */
	IRQ_MASK_SDRAMPARITY,	/* 13 */
	IRQ_MASK_I2OINPOST,	/* 14 */
	IRQ_MASK_PCI_ABORT,	/* 15 */
	IRQ_MASK_PCI_SERR,	/* 16 */
	IRQ_MASK_DISCARD_TIMER,	/* 17 */
	IRQ_MASK_PCI_DPERR,	/* 18 */
	IRQ_MASK_PCI_PERR,	/* 19 */
};

static void fb_mask_irq(unsigned int irq)
{
	*CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)];
}

static void fb_unmask_irq(unsigned int irq)
{
	*CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)];
}

static struct irqchip fb_chip = {
	.ack	= fb_mask_irq,
	.mask	= fb_mask_irq,
	.unmask = fb_unmask_irq,
};

static void __init __fb_init_irq(void)
{
	unsigned int irq;

	/*
	 * setup DC21285 IRQs
	 */
	*CSR_IRQ_DISABLE = -1;
	*CSR_FIQ_DISABLE = -1;

	for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
		set_irq_chip(irq, &fb_chip);
		set_irq_handler(irq, do_level_IRQ);
		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	}
}

void __init footbridge_init_irq(void)
{
	__fb_init_irq();

	if (!footbridge_cfn_mode())
		return;

	if (machine_is_ebsa285())
		/* The following is dependent on which slot
		 * you plug the Southbridge card into.  We
		 * currently assume that you plug it into
		 * the right-hand most slot.
		 */
		isa_init_irq(IRQ_PCI);

	if (machine_is_cats())
		isa_init_irq(IRQ_IN2);

	if (machine_is_netwinder())
		isa_init_irq(IRQ_IN3);
}

/*
 * Common mapping for all systems.  Note that the outbound write flush is
 * commented out since there is a "No Fix" problem with it.  Not mapping
 * it means that we have extra bullet protection on our feet.
 */
static struct map_desc fb_common_io_desc[] __initdata = {
	{
		.virtual	= ARMCSR_BASE,
		.pfn		= DC21285_ARMCSR_BASE,
		.length		= ARMCSR_SIZE,
		.type		= MT_DEVICE
	}, {
		.virtual	= XBUS_BASE,
		.pfn		= __phys_to_pfn(0x40000000),
		.length		= XBUS_SIZE,
		.type		= MT_DEVICE
	}
};

/*
 * The mapping when the footbridge is in host mode.  We don't map any of
 * this when we are in add-in mode.
 */
static struct map_desc ebsa285_host_io_desc[] __initdata = {
#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
	{
		.virtual	= PCIMEM_BASE,
		.pfn		= __phys_to_pfn(DC21285_PCI_MEM),
		.length		= PCIMEM_SIZE,
		.type		= MT_DEVICE
	}, {
		.virtual	= PCICFG0_BASE,
		.pfn		= __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG),
		.length		= PCICFG0_SIZE,
		.type		= MT_DEVICE
	}, {
		.virtual	= PCICFG1_BASE,
		.pfn		= __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG),
		.length		= PCICFG1_SIZE,
		.type		= MT_DEVICE
	}, {
		.virtual	= PCIIACK_BASE,
		.pfn		= __phys_to_pfn(DC21285_PCI_IACK),
		.length		= PCIIACK_SIZE,
		.type		= MT_DEVICE
	}, {
		.virtual	= PCIO_BASE,
		.pfn		= __phys_to_pfn(DC21285_PCI_IO),
		.length		= PCIO_SIZE,
		.type		= MT_DEVICE
	}
#endif
};

/*
 * The CO-ebsa285 mapping.
 */
static struct map_desc co285_io_desc[] __initdata = {
#ifdef CONFIG_ARCH_CO285
	{
		.virtual	= PCIO_BASE,
		.pfn		= __phys_to_pfn(DC21285_PCI_IO),
		.length		= PCIO_SIZE,
		.type		= MT_DEVICE
	}, {
		.virtual	= PCIMEM_BASE,
		.pfn		= __phys_to_pfn(DC21285_PCI_MEM),
		.length		= PCIMEM_SIZE,
		.type		= MT_DEVICE
	}
#endif
};

void __init footbridge_map_io(void)
{
	/*
	 * Set up the common mapping first; we need this to
	 * determine whether we're in host mode or not.
	 */
	iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));

	/*
	 * Now, work out what we've got to map in addition on this
	 * platform.
	 */
	if (machine_is_co285())
		iotable_init(co285_io_desc, ARRAY_SIZE(co285_io_desc));
	if (footbridge_cfn_mode())
		iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
}

#ifdef CONFIG_FOOTBRIDGE_ADDIN

/*
 * These two functions convert virtual addresses to PCI addresses and PCI
 * addresses to virtual addresses.  Note that it is only legal to use these
 * on memory obtained via get_zeroed_page or kmalloc.
 */
unsigned long __virt_to_bus(unsigned long res)
{
	WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);

	return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);
}
EXPORT_SYMBOL(__virt_to_bus);

unsigned long __bus_to_virt(unsigned long res)
{
	res -= (*CSR_PCISDRAMBASE & 0xfffffff0);
	res += PAGE_OFFSET;

	WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);

	return res;
}
EXPORT_SYMBOL(__bus_to_virt);

#endif