Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6
[pandora-kernel.git] / 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 #include <linux/io.h>
17 #include <linux/spinlock.h>
18  
19 #include <asm/pgtable.h>
20 #include <asm/page.h>
21 #include <asm/irq.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 irq_chip 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, handle_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         {
134                 .virtual        = ARMCSR_BASE,
135                 .pfn            = __phys_to_pfn(DC21285_ARMCSR_BASE),
136                 .length         = ARMCSR_SIZE,
137                 .type           = MT_DEVICE,
138         }, {
139                 .virtual        = XBUS_BASE,
140                 .pfn            = __phys_to_pfn(0x40000000),
141                 .length         = XBUS_SIZE,
142                 .type           = MT_DEVICE,
143         }
144 };
145
146 /*
147  * The mapping when the footbridge is in host mode.  We don't map any of
148  * this when we are in add-in mode.
149  */
150 static struct map_desc ebsa285_host_io_desc[] __initdata = {
151 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
152         {
153                 .virtual        = PCIMEM_BASE,
154                 .pfn            = __phys_to_pfn(DC21285_PCI_MEM),
155                 .length         = PCIMEM_SIZE,
156                 .type           = MT_DEVICE,
157         }, {
158                 .virtual        = PCICFG0_BASE,
159                 .pfn            = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG),
160                 .length         = PCICFG0_SIZE,
161                 .type           = MT_DEVICE,
162         }, {
163                 .virtual        = PCICFG1_BASE,
164                 .pfn            = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG),
165                 .length         = PCICFG1_SIZE,
166                 .type           = MT_DEVICE,
167         }, {
168                 .virtual        = PCIIACK_BASE,
169                 .pfn            = __phys_to_pfn(DC21285_PCI_IACK),
170                 .length         = PCIIACK_SIZE,
171                 .type           = MT_DEVICE,
172         }, {
173                 .virtual        = PCIO_BASE,
174                 .pfn            = __phys_to_pfn(DC21285_PCI_IO),
175                 .length         = PCIO_SIZE,
176                 .type           = MT_DEVICE,
177         },
178 #endif
179 };
180
181 void __init footbridge_map_io(void)
182 {
183         /*
184          * Set up the common mapping first; we need this to
185          * determine whether we're in host mode or not.
186          */
187         iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
188
189         /*
190          * Now, work out what we've got to map in addition on this
191          * platform.
192          */
193         if (footbridge_cfn_mode())
194                 iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
195 }
196
197 #ifdef CONFIG_FOOTBRIDGE_ADDIN
198
199 /*
200  * These two functions convert virtual addresses to PCI addresses and PCI
201  * addresses to virtual addresses.  Note that it is only legal to use these
202  * on memory obtained via get_zeroed_page or kmalloc.
203  */
204 unsigned long __virt_to_bus(unsigned long res)
205 {
206         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
207
208         return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);
209 }
210 EXPORT_SYMBOL(__virt_to_bus);
211
212 unsigned long __bus_to_virt(unsigned long res)
213 {
214         res -= (*CSR_PCISDRAMBASE & 0xfffffff0);
215         res += PAGE_OFFSET;
216
217         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
218
219         return res;
220 }
221 EXPORT_SYMBOL(__bus_to_virt);
222
223 #endif