Merge branch 'for-linus' of git://neil.brown.name/md
[linux-2.6] / arch / arm / mach-footbridge / common.c
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/module.h>
11 #include <linux/types.h>
12 #include <linux/mm.h>
13 #include <linux/ioport.h>
14 #include <linux/list.h>
15 #include <linux/init.h>
16  
17 #include <asm/pgtable.h>
18 #include <asm/page.h>
19 #include <asm/irq.h>
20 #include <asm/io.h>
21 #include <asm/mach-types.h>
22 #include <asm/setup.h>
23 #include <asm/hardware/dec21285.h>
24
25 #include <asm/mach/irq.h>
26 #include <asm/mach/map.h>
27
28 #include "common.h"
29
30 extern void __init isa_init_irq(unsigned int irq);
31
32 unsigned int mem_fclk_21285 = 50000000;
33
34 EXPORT_SYMBOL(mem_fclk_21285);
35
36 static int __init parse_tag_memclk(const struct tag *tag)
37 {
38         mem_fclk_21285 = tag->u.memclk.fmemclk;
39         return 0;
40 }
41
42 __tagtable(ATAG_MEMCLK, parse_tag_memclk);
43
44 /*
45  * Footbridge IRQ translation table
46  *  Converts from our IRQ numbers into FootBridge masks
47  */
48 static const int fb_irq_mask[] = {
49         IRQ_MASK_UART_RX,       /*  0 */
50         IRQ_MASK_UART_TX,       /*  1 */
51         IRQ_MASK_TIMER1,        /*  2 */
52         IRQ_MASK_TIMER2,        /*  3 */
53         IRQ_MASK_TIMER3,        /*  4 */
54         IRQ_MASK_IN0,           /*  5 */
55         IRQ_MASK_IN1,           /*  6 */
56         IRQ_MASK_IN2,           /*  7 */
57         IRQ_MASK_IN3,           /*  8 */
58         IRQ_MASK_DOORBELLHOST,  /*  9 */
59         IRQ_MASK_DMA1,          /* 10 */
60         IRQ_MASK_DMA2,          /* 11 */
61         IRQ_MASK_PCI,           /* 12 */
62         IRQ_MASK_SDRAMPARITY,   /* 13 */
63         IRQ_MASK_I2OINPOST,     /* 14 */
64         IRQ_MASK_PCI_ABORT,     /* 15 */
65         IRQ_MASK_PCI_SERR,      /* 16 */
66         IRQ_MASK_DISCARD_TIMER, /* 17 */
67         IRQ_MASK_PCI_DPERR,     /* 18 */
68         IRQ_MASK_PCI_PERR,      /* 19 */
69 };
70
71 static void fb_mask_irq(unsigned int irq)
72 {
73         *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)];
74 }
75
76 static void fb_unmask_irq(unsigned int irq)
77 {
78         *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)];
79 }
80
81 static struct irq_chip fb_chip = {
82         .ack    = fb_mask_irq,
83         .mask   = fb_mask_irq,
84         .unmask = fb_unmask_irq,
85 };
86
87 static void __init __fb_init_irq(void)
88 {
89         unsigned int irq;
90
91         /*
92          * setup DC21285 IRQs
93          */
94         *CSR_IRQ_DISABLE = -1;
95         *CSR_FIQ_DISABLE = -1;
96
97         for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
98                 set_irq_chip(irq, &fb_chip);
99                 set_irq_handler(irq, handle_level_irq);
100                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
101         }
102 }
103
104 void __init footbridge_init_irq(void)
105 {
106         __fb_init_irq();
107
108         if (!footbridge_cfn_mode())
109                 return;
110
111         if (machine_is_ebsa285())
112                 /* The following is dependent on which slot
113                  * you plug the Southbridge card into.  We
114                  * currently assume that you plug it into
115                  * the right-hand most slot.
116                  */
117                 isa_init_irq(IRQ_PCI);
118
119         if (machine_is_cats())
120                 isa_init_irq(IRQ_IN2);
121
122         if (machine_is_netwinder())
123                 isa_init_irq(IRQ_IN3);
124 }
125
126 /*
127  * Common mapping for all systems.  Note that the outbound write flush is
128  * commented out since there is a "No Fix" problem with it.  Not mapping
129  * it means that we have extra bullet protection on our feet.
130  */
131 static struct map_desc fb_common_io_desc[] __initdata = {
132         {
133                 .virtual        = ARMCSR_BASE,
134                 .pfn            = __phys_to_pfn(DC21285_ARMCSR_BASE),
135                 .length         = ARMCSR_SIZE,
136                 .type           = MT_DEVICE,
137         }, {
138                 .virtual        = XBUS_BASE,
139                 .pfn            = __phys_to_pfn(0x40000000),
140                 .length         = XBUS_SIZE,
141                 .type           = MT_DEVICE,
142         }
143 };
144
145 /*
146  * The mapping when the footbridge is in host mode.  We don't map any of
147  * this when we are in add-in mode.
148  */
149 static struct map_desc ebsa285_host_io_desc[] __initdata = {
150 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
151         {
152                 .virtual        = PCIMEM_BASE,
153                 .pfn            = __phys_to_pfn(DC21285_PCI_MEM),
154                 .length         = PCIMEM_SIZE,
155                 .type           = MT_DEVICE,
156         }, {
157                 .virtual        = PCICFG0_BASE,
158                 .pfn            = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG),
159                 .length         = PCICFG0_SIZE,
160                 .type           = MT_DEVICE,
161         }, {
162                 .virtual        = PCICFG1_BASE,
163                 .pfn            = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG),
164                 .length         = PCICFG1_SIZE,
165                 .type           = MT_DEVICE,
166         }, {
167                 .virtual        = PCIIACK_BASE,
168                 .pfn            = __phys_to_pfn(DC21285_PCI_IACK),
169                 .length         = PCIIACK_SIZE,
170                 .type           = MT_DEVICE,
171         }, {
172                 .virtual        = PCIO_BASE,
173                 .pfn            = __phys_to_pfn(DC21285_PCI_IO),
174                 .length         = PCIO_SIZE,
175                 .type           = MT_DEVICE,
176         },
177 #endif
178 };
179
180 void __init footbridge_map_io(void)
181 {
182         /*
183          * Set up the common mapping first; we need this to
184          * determine whether we're in host mode or not.
185          */
186         iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
187
188         /*
189          * Now, work out what we've got to map in addition on this
190          * platform.
191          */
192         if (footbridge_cfn_mode())
193                 iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
194 }
195
196 #ifdef CONFIG_FOOTBRIDGE_ADDIN
197
198 /*
199  * These two functions convert virtual addresses to PCI addresses and PCI
200  * addresses to virtual addresses.  Note that it is only legal to use these
201  * on memory obtained via get_zeroed_page or kmalloc.
202  */
203 unsigned long __virt_to_bus(unsigned long res)
204 {
205         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
206
207         return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);
208 }
209 EXPORT_SYMBOL(__virt_to_bus);
210
211 unsigned long __bus_to_virt(unsigned long res)
212 {
213         res -= (*CSR_PCISDRAMBASE & 0xfffffff0);
214         res += PAGE_OFFSET;
215
216         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
217
218         return res;
219 }
220 EXPORT_SYMBOL(__bus_to_virt);
221
222 #endif