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