GNU Linux-libre 4.9.306-gnu1
[releases.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 #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
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
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
81 static void fb_mask_irq(struct irq_data *d)
82 {
83         *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(d->irq)];
84 }
85
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
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                 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
110         }
111 }
112
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
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
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
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  */
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
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
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
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