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 #include <video/vga.h>
19
20 #include <asm/pgtable.h>
21 #include <asm/page.h>
22 #include <asm/irq.h>
23 #include <asm/mach-types.h>
24 #include <asm/setup.h>
25 #include <asm/system_misc.h>
26 #include <asm/hardware/dec21285.h>
27
28 #include <asm/mach/irq.h>
29 #include <asm/mach/map.h>
30 #include <asm/mach/pci.h>
31
32 #include "common.h"
33
34 unsigned int mem_fclk_21285 = 50000000;
35
36 EXPORT_SYMBOL(mem_fclk_21285);
37
early_fclk(char * arg)38 static int __init early_fclk(char *arg)
39 {
40 mem_fclk_21285 = simple_strtoul(arg, NULL, 0);
41 return 0;
42 }
43
44 early_param("mem_fclk_21285", early_fclk);
45
parse_tag_memclk(const struct tag * tag)46 static int __init parse_tag_memclk(const struct tag *tag)
47 {
48 mem_fclk_21285 = tag->u.memclk.fmemclk;
49 return 0;
50 }
51
52 __tagtable(ATAG_MEMCLK, parse_tag_memclk);
53
54 /*
55 * Footbridge IRQ translation table
56 * Converts from our IRQ numbers into FootBridge masks
57 */
58 static const int fb_irq_mask[] = {
59 IRQ_MASK_UART_RX, /* 0 */
60 IRQ_MASK_UART_TX, /* 1 */
61 IRQ_MASK_TIMER1, /* 2 */
62 IRQ_MASK_TIMER2, /* 3 */
63 IRQ_MASK_TIMER3, /* 4 */
64 IRQ_MASK_IN0, /* 5 */
65 IRQ_MASK_IN1, /* 6 */
66 IRQ_MASK_IN2, /* 7 */
67 IRQ_MASK_IN3, /* 8 */
68 IRQ_MASK_DOORBELLHOST, /* 9 */
69 IRQ_MASK_DMA1, /* 10 */
70 IRQ_MASK_DMA2, /* 11 */
71 IRQ_MASK_PCI, /* 12 */
72 IRQ_MASK_SDRAMPARITY, /* 13 */
73 IRQ_MASK_I2OINPOST, /* 14 */
74 IRQ_MASK_PCI_ABORT, /* 15 */
75 IRQ_MASK_PCI_SERR, /* 16 */
76 IRQ_MASK_DISCARD_TIMER, /* 17 */
77 IRQ_MASK_PCI_DPERR, /* 18 */
78 IRQ_MASK_PCI_PERR, /* 19 */
79 };
80
fb_mask_irq(struct irq_data * d)81 static void fb_mask_irq(struct irq_data *d)
82 {
83 *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(d->irq)];
84 }
85
fb_unmask_irq(struct irq_data * d)86 static void fb_unmask_irq(struct irq_data *d)
87 {
88 *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(d->irq)];
89 }
90
91 static struct irq_chip fb_chip = {
92 .irq_ack = fb_mask_irq,
93 .irq_mask = fb_mask_irq,
94 .irq_unmask = fb_unmask_irq,
95 };
96
__fb_init_irq(void)97 static void __init __fb_init_irq(void)
98 {
99 unsigned int irq;
100
101 /*
102 * setup DC21285 IRQs
103 */
104 *CSR_IRQ_DISABLE = -1;
105 *CSR_FIQ_DISABLE = -1;
106
107 for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
108 irq_set_chip_and_handler(irq, &fb_chip, handle_level_irq);
109 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
110 }
111 }
112
footbridge_init_irq(void)113 void __init footbridge_init_irq(void)
114 {
115 __fb_init_irq();
116
117 if (!footbridge_cfn_mode())
118 return;
119
120 if (machine_is_ebsa285())
121 /* The following is dependent on which slot
122 * you plug the Southbridge card into. We
123 * currently assume that you plug it into
124 * the right-hand most slot.
125 */
126 isa_init_irq(IRQ_PCI);
127
128 if (machine_is_cats())
129 isa_init_irq(IRQ_IN2);
130
131 if (machine_is_netwinder())
132 isa_init_irq(IRQ_IN3);
133 }
134
135 /*
136 * Common mapping for all systems. Note that the outbound write flush is
137 * commented out since there is a "No Fix" problem with it. Not mapping
138 * it means that we have extra bullet protection on our feet.
139 */
140 static struct map_desc fb_common_io_desc[] __initdata = {
141 {
142 .virtual = ARMCSR_BASE,
143 .pfn = __phys_to_pfn(DC21285_ARMCSR_BASE),
144 .length = ARMCSR_SIZE,
145 .type = MT_DEVICE,
146 }
147 };
148
149 /*
150 * The mapping when the footbridge is in host mode. We don't map any of
151 * this when we are in add-in mode.
152 */
153 static struct map_desc ebsa285_host_io_desc[] __initdata = {
154 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
155 {
156 .virtual = PCIMEM_BASE,
157 .pfn = __phys_to_pfn(DC21285_PCI_MEM),
158 .length = PCIMEM_SIZE,
159 .type = MT_DEVICE,
160 }, {
161 .virtual = PCICFG0_BASE,
162 .pfn = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG),
163 .length = PCICFG0_SIZE,
164 .type = MT_DEVICE,
165 }, {
166 .virtual = PCICFG1_BASE,
167 .pfn = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG),
168 .length = PCICFG1_SIZE,
169 .type = MT_DEVICE,
170 }, {
171 .virtual = PCIIACK_BASE,
172 .pfn = __phys_to_pfn(DC21285_PCI_IACK),
173 .length = PCIIACK_SIZE,
174 .type = MT_DEVICE,
175 },
176 #endif
177 };
178
footbridge_map_io(void)179 void __init footbridge_map_io(void)
180 {
181 /*
182 * Set up the common mapping first; we need this to
183 * determine whether we're in host mode or not.
184 */
185 iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
186
187 /*
188 * Now, work out what we've got to map in addition on this
189 * platform.
190 */
191 if (footbridge_cfn_mode()) {
192 iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
193 pci_map_io_early(__phys_to_pfn(DC21285_PCI_IO));
194 }
195
196 vga_base = PCIMEM_BASE;
197 }
198
footbridge_restart(enum reboot_mode mode,const char * cmd)199 void footbridge_restart(enum reboot_mode mode, const char *cmd)
200 {
201 if (mode == REBOOT_SOFT) {
202 /* Jump into the ROM */
203 soft_restart(0x41000000);
204 } else {
205 /*
206 * Force the watchdog to do a CPU reset.
207 *
208 * After making sure that the watchdog is disabled
209 * (so we can change the timer registers) we first
210 * enable the timer to autoreload itself. Next, the
211 * timer interval is set really short and any
212 * current interrupt request is cleared (so we can
213 * see an edge transition). Finally, TIMER4 is
214 * enabled as the watchdog.
215 */
216 *CSR_SA110_CNTL &= ~(1 << 13);
217 *CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE |
218 TIMER_CNTL_AUTORELOAD |
219 TIMER_CNTL_DIV16;
220 *CSR_TIMER4_LOAD = 0x2;
221 *CSR_TIMER4_CLR = 0;
222 *CSR_SA110_CNTL |= (1 << 13);
223 }
224 }
225
226 #ifdef CONFIG_FOOTBRIDGE_ADDIN
227
fb_bus_sdram_offset(void)228 static inline unsigned long fb_bus_sdram_offset(void)
229 {
230 return *CSR_PCISDRAMBASE & 0xfffffff0;
231 }
232
233 /*
234 * These two functions convert virtual addresses to PCI addresses and PCI
235 * addresses to virtual addresses. Note that it is only legal to use these
236 * on memory obtained via get_zeroed_page or kmalloc.
237 */
__virt_to_bus(unsigned long res)238 unsigned long __virt_to_bus(unsigned long res)
239 {
240 WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
241
242 return res + (fb_bus_sdram_offset() - PAGE_OFFSET);
243 }
244 EXPORT_SYMBOL(__virt_to_bus);
245
__bus_to_virt(unsigned long res)246 unsigned long __bus_to_virt(unsigned long res)
247 {
248 res = res - (fb_bus_sdram_offset() - PAGE_OFFSET);
249
250 WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
251
252 return res;
253 }
254 EXPORT_SYMBOL(__bus_to_virt);
255
__pfn_to_bus(unsigned long pfn)256 unsigned long __pfn_to_bus(unsigned long pfn)
257 {
258 return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET);
259 }
260 EXPORT_SYMBOL(__pfn_to_bus);
261
__bus_to_pfn(unsigned long bus)262 unsigned long __bus_to_pfn(unsigned long bus)
263 {
264 return __phys_to_pfn(bus - (fb_bus_sdram_offset() - PHYS_OFFSET));
265 }
266 EXPORT_SYMBOL(__bus_to_pfn);
267
268 #endif
269