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 
35 static void __init early_fclk(char **arg)
36 {
37 	mem_fclk_21285 = simple_strtoul(*arg, arg, 0);
38 }
39 
40 __early_param("mem_fclk_21285=", early_fclk);
41 
42 static int __init parse_tag_memclk(const struct tag *tag)
43 {
44 	mem_fclk_21285 = tag->u.memclk.fmemclk;
45 	return 0;
46 }
47 
48 __tagtable(ATAG_MEMCLK, parse_tag_memclk);
49 
50 /*
51  * Footbridge IRQ translation table
52  *  Converts from our IRQ numbers into FootBridge masks
53  */
54 static const int fb_irq_mask[] = {
55 	IRQ_MASK_UART_RX,	/*  0 */
56 	IRQ_MASK_UART_TX,	/*  1 */
57 	IRQ_MASK_TIMER1,	/*  2 */
58 	IRQ_MASK_TIMER2,	/*  3 */
59 	IRQ_MASK_TIMER3,	/*  4 */
60 	IRQ_MASK_IN0,		/*  5 */
61 	IRQ_MASK_IN1,		/*  6 */
62 	IRQ_MASK_IN2,		/*  7 */
63 	IRQ_MASK_IN3,		/*  8 */
64 	IRQ_MASK_DOORBELLHOST,	/*  9 */
65 	IRQ_MASK_DMA1,		/* 10 */
66 	IRQ_MASK_DMA2,		/* 11 */
67 	IRQ_MASK_PCI,		/* 12 */
68 	IRQ_MASK_SDRAMPARITY,	/* 13 */
69 	IRQ_MASK_I2OINPOST,	/* 14 */
70 	IRQ_MASK_PCI_ABORT,	/* 15 */
71 	IRQ_MASK_PCI_SERR,	/* 16 */
72 	IRQ_MASK_DISCARD_TIMER,	/* 17 */
73 	IRQ_MASK_PCI_DPERR,	/* 18 */
74 	IRQ_MASK_PCI_PERR,	/* 19 */
75 };
76 
77 static void fb_mask_irq(unsigned int irq)
78 {
79 	*CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)];
80 }
81 
82 static void fb_unmask_irq(unsigned int irq)
83 {
84 	*CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)];
85 }
86 
87 static struct irq_chip fb_chip = {
88 	.ack	= fb_mask_irq,
89 	.mask	= fb_mask_irq,
90 	.unmask = fb_unmask_irq,
91 };
92 
93 static void __init __fb_init_irq(void)
94 {
95 	unsigned int irq;
96 
97 	/*
98 	 * setup DC21285 IRQs
99 	 */
100 	*CSR_IRQ_DISABLE = -1;
101 	*CSR_FIQ_DISABLE = -1;
102 
103 	for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
104 		set_irq_chip(irq, &fb_chip);
105 		set_irq_handler(irq, handle_level_irq);
106 		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
107 	}
108 }
109 
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 
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 
204 /*
205  * These two functions convert virtual addresses to PCI addresses and PCI
206  * addresses to virtual addresses.  Note that it is only legal to use these
207  * on memory obtained via get_zeroed_page or kmalloc.
208  */
209 unsigned long __virt_to_bus(unsigned long res)
210 {
211 	WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
212 
213 	return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);
214 }
215 EXPORT_SYMBOL(__virt_to_bus);
216 
217 unsigned long __bus_to_virt(unsigned long res)
218 {
219 	res -= (*CSR_PCISDRAMBASE & 0xfffffff0);
220 	res += PAGE_OFFSET;
221 
222 	WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
223 
224 	return res;
225 }
226 EXPORT_SYMBOL(__bus_to_virt);
227 
228 #endif
229