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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mach-footbridge/common.c | |
3 | * | |
4 | * Copyright (C) 1998-2000 Russell King, Dave Gilbert. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/config.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/init.h> | |
17 | ||
18 | #include <asm/pgtable.h> | |
19 | #include <asm/page.h> | |
20 | #include <asm/irq.h> | |
21 | #include <asm/io.h> | |
22 | #include <asm/mach-types.h> | |
23 | #include <asm/setup.h> | |
24 | #include <asm/hardware/dec21285.h> | |
25 | ||
26 | #include <asm/mach/irq.h> | |
27 | #include <asm/mach/map.h> | |
28 | ||
29 | #include "common.h" | |
30 | ||
31 | extern void __init isa_init_irq(unsigned int irq); | |
32 | ||
33 | unsigned int mem_fclk_21285 = 50000000; | |
34 | ||
35 | EXPORT_SYMBOL(mem_fclk_21285); | |
36 | ||
37 | static int __init parse_tag_memclk(const struct tag *tag) | |
38 | { | |
39 | mem_fclk_21285 = tag->u.memclk.fmemclk; | |
40 | return 0; | |
41 | } | |
42 | ||
43 | __tagtable(ATAG_MEMCLK, parse_tag_memclk); | |
44 | ||
45 | /* | |
46 | * Footbridge IRQ translation table | |
47 | * Converts from our IRQ numbers into FootBridge masks | |
48 | */ | |
49 | static const int fb_irq_mask[] = { | |
50 | IRQ_MASK_UART_RX, /* 0 */ | |
51 | IRQ_MASK_UART_TX, /* 1 */ | |
52 | IRQ_MASK_TIMER1, /* 2 */ | |
53 | IRQ_MASK_TIMER2, /* 3 */ | |
54 | IRQ_MASK_TIMER3, /* 4 */ | |
55 | IRQ_MASK_IN0, /* 5 */ | |
56 | IRQ_MASK_IN1, /* 6 */ | |
57 | IRQ_MASK_IN2, /* 7 */ | |
58 | IRQ_MASK_IN3, /* 8 */ | |
59 | IRQ_MASK_DOORBELLHOST, /* 9 */ | |
60 | IRQ_MASK_DMA1, /* 10 */ | |
61 | IRQ_MASK_DMA2, /* 11 */ | |
62 | IRQ_MASK_PCI, /* 12 */ | |
63 | IRQ_MASK_SDRAMPARITY, /* 13 */ | |
64 | IRQ_MASK_I2OINPOST, /* 14 */ | |
65 | IRQ_MASK_PCI_ABORT, /* 15 */ | |
66 | IRQ_MASK_PCI_SERR, /* 16 */ | |
67 | IRQ_MASK_DISCARD_TIMER, /* 17 */ | |
68 | IRQ_MASK_PCI_DPERR, /* 18 */ | |
69 | IRQ_MASK_PCI_PERR, /* 19 */ | |
70 | }; | |
71 | ||
72 | static void fb_mask_irq(unsigned int irq) | |
73 | { | |
74 | *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)]; | |
75 | } | |
76 | ||
77 | static void fb_unmask_irq(unsigned int irq) | |
78 | { | |
79 | *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)]; | |
80 | } | |
81 | ||
82 | static struct irqchip fb_chip = { | |
83 | .ack = fb_mask_irq, | |
84 | .mask = fb_mask_irq, | |
85 | .unmask = fb_unmask_irq, | |
86 | }; | |
87 | ||
88 | static void __init __fb_init_irq(void) | |
89 | { | |
90 | unsigned int irq; | |
91 | ||
92 | /* | |
93 | * setup DC21285 IRQs | |
94 | */ | |
95 | *CSR_IRQ_DISABLE = -1; | |
96 | *CSR_FIQ_DISABLE = -1; | |
97 | ||
98 | for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) { | |
99 | set_irq_chip(irq, &fb_chip); | |
100 | set_irq_handler(irq, do_level_IRQ); | |
101 | set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); | |
102 | } | |
103 | } | |
104 | ||
105 | void __init footbridge_init_irq(void) | |
106 | { | |
107 | __fb_init_irq(); | |
108 | ||
109 | if (!footbridge_cfn_mode()) | |
110 | return; | |
111 | ||
112 | if (machine_is_ebsa285()) | |
113 | /* The following is dependent on which slot | |
114 | * you plug the Southbridge card into. We | |
115 | * currently assume that you plug it into | |
116 | * the right-hand most slot. | |
117 | */ | |
118 | isa_init_irq(IRQ_PCI); | |
119 | ||
120 | if (machine_is_cats()) | |
121 | isa_init_irq(IRQ_IN2); | |
122 | ||
123 | if (machine_is_netwinder()) | |
124 | isa_init_irq(IRQ_IN3); | |
125 | } | |
126 | ||
127 | /* | |
128 | * Common mapping for all systems. Note that the outbound write flush is | |
129 | * commented out since there is a "No Fix" problem with it. Not mapping | |
130 | * it means that we have extra bullet protection on our feet. | |
131 | */ | |
132 | static struct map_desc fb_common_io_desc[] __initdata = { | |
133 | { ARMCSR_BASE, DC21285_ARMCSR_BASE, ARMCSR_SIZE, MT_DEVICE }, | |
134 | { XBUS_BASE, 0x40000000, XBUS_SIZE, MT_DEVICE } | |
135 | }; | |
136 | ||
137 | /* | |
138 | * The mapping when the footbridge is in host mode. We don't map any of | |
139 | * this when we are in add-in mode. | |
140 | */ | |
141 | static struct map_desc ebsa285_host_io_desc[] __initdata = { | |
142 | #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST) | |
143 | { PCIMEM_BASE, DC21285_PCI_MEM, PCIMEM_SIZE, MT_DEVICE }, | |
144 | { PCICFG0_BASE, DC21285_PCI_TYPE_0_CONFIG, PCICFG0_SIZE, MT_DEVICE }, | |
145 | { PCICFG1_BASE, DC21285_PCI_TYPE_1_CONFIG, PCICFG1_SIZE, MT_DEVICE }, | |
146 | { PCIIACK_BASE, DC21285_PCI_IACK, PCIIACK_SIZE, MT_DEVICE }, | |
147 | { PCIO_BASE, DC21285_PCI_IO, PCIO_SIZE, MT_DEVICE } | |
148 | #endif | |
149 | }; | |
150 | ||
151 | /* | |
152 | * The CO-ebsa285 mapping. | |
153 | */ | |
154 | static struct map_desc co285_io_desc[] __initdata = { | |
155 | #ifdef CONFIG_ARCH_CO285 | |
156 | { PCIO_BASE, DC21285_PCI_IO, PCIO_SIZE, MT_DEVICE }, | |
157 | { PCIMEM_BASE, DC21285_PCI_MEM, PCIMEM_SIZE, MT_DEVICE } | |
158 | #endif | |
159 | }; | |
160 | ||
161 | void __init footbridge_map_io(void) | |
162 | { | |
163 | /* | |
164 | * Set up the common mapping first; we need this to | |
165 | * determine whether we're in host mode or not. | |
166 | */ | |
167 | iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc)); | |
168 | ||
169 | /* | |
170 | * Now, work out what we've got to map in addition on this | |
171 | * platform. | |
172 | */ | |
173 | if (machine_is_co285()) | |
174 | iotable_init(co285_io_desc, ARRAY_SIZE(co285_io_desc)); | |
175 | if (footbridge_cfn_mode()) | |
176 | iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc)); | |
177 | } | |
178 | ||
179 | #ifdef CONFIG_FOOTBRIDGE_ADDIN | |
180 | ||
181 | /* | |
182 | * These two functions convert virtual addresses to PCI addresses and PCI | |
183 | * addresses to virtual addresses. Note that it is only legal to use these | |
184 | * on memory obtained via get_zeroed_page or kmalloc. | |
185 | */ | |
186 | unsigned long __virt_to_bus(unsigned long res) | |
187 | { | |
188 | WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); | |
189 | ||
190 | return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0); | |
191 | } | |
192 | EXPORT_SYMBOL(__virt_to_bus); | |
193 | ||
194 | unsigned long __bus_to_virt(unsigned long res) | |
195 | { | |
196 | res -= (*CSR_PCISDRAMBASE & 0xfffffff0); | |
197 | res += PAGE_OFFSET; | |
198 | ||
199 | WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); | |
200 | ||
201 | return res; | |
202 | } | |
203 | EXPORT_SYMBOL(__bus_to_virt); | |
204 | ||
205 | #endif |