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Linux/arch/arm/mach-footbridge/common.c

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  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
269 

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