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 unsigned int mem_fclk_21285 = 50000000;
32
33 EXPORT_SYMBOL(mem_fclk_21285);
34
early_fclk(char * arg)35 static int __init early_fclk(char *arg)
36 {
37 mem_fclk_21285 = simple_strtoul(arg, NULL, 0);
38 return 0;
39 }
40
41 early_param("mem_fclk_21285", early_fclk);
42
parse_tag_memclk(const struct tag * tag)43 static int __init parse_tag_memclk(const struct tag *tag)
44 {
45 mem_fclk_21285 = tag->u.memclk.fmemclk;
46 return 0;
47 }
48
49 __tagtable(ATAG_MEMCLK, parse_tag_memclk);
50
51 /*
52 * Footbridge IRQ translation table
53 * Converts from our IRQ numbers into FootBridge masks
54 */
55 static const int fb_irq_mask[] = {
56 IRQ_MASK_UART_RX, /* 0 */
57 IRQ_MASK_UART_TX, /* 1 */
58 IRQ_MASK_TIMER1, /* 2 */
59 IRQ_MASK_TIMER2, /* 3 */
60 IRQ_MASK_TIMER3, /* 4 */
61 IRQ_MASK_IN0, /* 5 */
62 IRQ_MASK_IN1, /* 6 */
63 IRQ_MASK_IN2, /* 7 */
64 IRQ_MASK_IN3, /* 8 */
65 IRQ_MASK_DOORBELLHOST, /* 9 */
66 IRQ_MASK_DMA1, /* 10 */
67 IRQ_MASK_DMA2, /* 11 */
68 IRQ_MASK_PCI, /* 12 */
69 IRQ_MASK_SDRAMPARITY, /* 13 */
70 IRQ_MASK_I2OINPOST, /* 14 */
71 IRQ_MASK_PCI_ABORT, /* 15 */
72 IRQ_MASK_PCI_SERR, /* 16 */
73 IRQ_MASK_DISCARD_TIMER, /* 17 */
74 IRQ_MASK_PCI_DPERR, /* 18 */
75 IRQ_MASK_PCI_PERR, /* 19 */
76 };
77
fb_mask_irq(struct irq_data * d)78 static void fb_mask_irq(struct irq_data *d)
79 {
80 *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(d->irq)];
81 }
82
fb_unmask_irq(struct irq_data * d)83 static void fb_unmask_irq(struct irq_data *d)
84 {
85 *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(d->irq)];
86 }
87
88 static struct irq_chip fb_chip = {
89 .irq_ack = fb_mask_irq,
90 .irq_mask = fb_mask_irq,
91 .irq_unmask = fb_unmask_irq,
92 };
93
__fb_init_irq(void)94 static void __init __fb_init_irq(void)
95 {
96 unsigned int irq;
97
98 /*
99 * setup DC21285 IRQs
100 */
101 *CSR_IRQ_DISABLE = -1;
102 *CSR_FIQ_DISABLE = -1;
103
104 for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
105 irq_set_chip_and_handler(irq, &fb_chip, handle_level_irq);
106 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
107 }
108 }
109
footbridge_init_irq(void)110 void __init footbridge_init_irq(void)
111 {
112 __fb_init_irq();
113
114 if (!footbridge_cfn_mode())
115 return;
116
117 if (machine_is_ebsa285())
118 /* The following is dependent on which slot
119 * you plug the Southbridge card into. We
120 * currently assume that you plug it into
121 * the right-hand most slot.
122 */
123 isa_init_irq(IRQ_PCI);
124
125 if (machine_is_cats())
126 isa_init_irq(IRQ_IN2);
127
128 if (machine_is_netwinder())
129 isa_init_irq(IRQ_IN3);
130 }
131
132 /*
133 * Common mapping for all systems. Note that the outbound write flush is
134 * commented out since there is a "No Fix" problem with it. Not mapping
135 * it means that we have extra bullet protection on our feet.
136 */
137 static struct map_desc fb_common_io_desc[] __initdata = {
138 {
139 .virtual = ARMCSR_BASE,
140 .pfn = __phys_to_pfn(DC21285_ARMCSR_BASE),
141 .length = ARMCSR_SIZE,
142 .type = MT_DEVICE,
143 }, {
144 .virtual = XBUS_BASE,
145 .pfn = __phys_to_pfn(0x40000000),
146 .length = XBUS_SIZE,
147 .type = MT_DEVICE,
148 }
149 };
150
151 /*
152 * The mapping when the footbridge is in host mode. We don't map any of
153 * this when we are in add-in mode.
154 */
155 static struct map_desc ebsa285_host_io_desc[] __initdata = {
156 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
157 {
158 .virtual = PCIMEM_BASE,
159 .pfn = __phys_to_pfn(DC21285_PCI_MEM),
160 .length = PCIMEM_SIZE,
161 .type = MT_DEVICE,
162 }, {
163 .virtual = PCICFG0_BASE,
164 .pfn = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG),
165 .length = PCICFG0_SIZE,
166 .type = MT_DEVICE,
167 }, {
168 .virtual = PCICFG1_BASE,
169 .pfn = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG),
170 .length = PCICFG1_SIZE,
171 .type = MT_DEVICE,
172 }, {
173 .virtual = PCIIACK_BASE,
174 .pfn = __phys_to_pfn(DC21285_PCI_IACK),
175 .length = PCIIACK_SIZE,
176 .type = MT_DEVICE,
177 }, {
178 .virtual = PCIO_BASE,
179 .pfn = __phys_to_pfn(DC21285_PCI_IO),
180 .length = PCIO_SIZE,
181 .type = MT_DEVICE,
182 },
183 #endif
184 };
185
footbridge_map_io(void)186 void __init footbridge_map_io(void)
187 {
188 /*
189 * Set up the common mapping first; we need this to
190 * determine whether we're in host mode or not.
191 */
192 iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
193
194 /*
195 * Now, work out what we've got to map in addition on this
196 * platform.
197 */
198 if (footbridge_cfn_mode())
199 iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
200 }
201
202 #ifdef CONFIG_FOOTBRIDGE_ADDIN
203
fb_bus_sdram_offset(void)204 static inline unsigned long fb_bus_sdram_offset(void)
205 {
206 return *CSR_PCISDRAMBASE & 0xfffffff0;
207 }
208
209 /*
210 * These two functions convert virtual addresses to PCI addresses and PCI
211 * addresses to virtual addresses. Note that it is only legal to use these
212 * on memory obtained via get_zeroed_page or kmalloc.
213 */
__virt_to_bus(unsigned long res)214 unsigned long __virt_to_bus(unsigned long res)
215 {
216 WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
217
218 return res + (fb_bus_sdram_offset() - PAGE_OFFSET);
219 }
220 EXPORT_SYMBOL(__virt_to_bus);
221
__bus_to_virt(unsigned long res)222 unsigned long __bus_to_virt(unsigned long res)
223 {
224 res = res - (fb_bus_sdram_offset() - PAGE_OFFSET);
225
226 WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
227
228 return res;
229 }
230 EXPORT_SYMBOL(__bus_to_virt);
231
__pfn_to_bus(unsigned long pfn)232 unsigned long __pfn_to_bus(unsigned long pfn)
233 {
234 return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET);
235 }
236 EXPORT_SYMBOL(__pfn_to_bus);
237
__bus_to_pfn(unsigned long bus)238 unsigned long __bus_to_pfn(unsigned long bus)
239 {
240 return __phys_to_pfn(bus - (fb_bus_sdram_offset() - PHYS_OFFSET));
241 }
242 EXPORT_SYMBOL(__bus_to_pfn);
243
244 #endif
245