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
  17 #include <asm/pgtable.h>
  18 #include <asm/page.h>
  19 #include <asm/irq.h>
  20 #include <asm/io.h>
  21 #include <asm/mach-types.h>
  22 #include <asm/setup.h>
  23 #include <asm/hardware/dec21285.h>
  24
  25 #include <asm/mach/irq.h>
  26 #include <asm/mach/map.h>
  27
  28 #include "common.h"
  29
  30 extern void __init isa_init_irq(unsigned int irq);
  31
  32 unsigned int mem_fclk_21285 = 50000000;
  33
  34 EXPORT_SYMBOL(mem_fclk_21285);
  35
  36 static int __init parse_tag_memclk(const struct tag *tag)
  37 {
  38         mem_fclk_21285 = tag->u.memclk.fmemclk;
  39         return 0;
  40 }
  41
  42 __tagtable(ATAG_MEMCLK, parse_tag_memclk);
  43
  44 /*
  45  * Footbridge IRQ translation table
  46  *  Converts from our IRQ numbers into FootBridge masks
  47  */
  48 static const int fb_irq_mask[] = {
  49         IRQ_MASK_UART_RX,       /*  0 */
  50         IRQ_MASK_UART_TX,       /*  1 */
  51         IRQ_MASK_TIMER1,        /*  2 */
  52         IRQ_MASK_TIMER2,        /*  3 */
  53         IRQ_MASK_TIMER3,        /*  4 */
  54         IRQ_MASK_IN0,           /*  5 */
  55         IRQ_MASK_IN1,           /*  6 */
  56         IRQ_MASK_IN2,           /*  7 */
  57         IRQ_MASK_IN3,           /*  8 */
  58         IRQ_MASK_DOORBELLHOST,  /*  9 */
  59         IRQ_MASK_DMA1,          /* 10 */
  60         IRQ_MASK_DMA2,          /* 11 */
  61         IRQ_MASK_PCI,           /* 12 */
  62         IRQ_MASK_SDRAMPARITY,   /* 13 */
  63         IRQ_MASK_I2OINPOST,     /* 14 */
  64         IRQ_MASK_PCI_ABORT,     /* 15 */
  65         IRQ_MASK_PCI_SERR,      /* 16 */
  66         IRQ_MASK_DISCARD_TIMER, /* 17 */
  67         IRQ_MASK_PCI_DPERR,     /* 18 */
  68         IRQ_MASK_PCI_PERR,      /* 19 */
  69 };
  70
  71 static void fb_mask_irq(unsigned int irq)
  72 {
  73         *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)];
  74 }
  75
  76 static void fb_unmask_irq(unsigned int irq)
  77 {
  78         *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)];
  79 }
  80
  81 static struct irq_chip fb_chip = {
  82         .ack    = fb_mask_irq,
  83         .mask   = fb_mask_irq,
  84         .unmask = fb_unmask_irq,
  85 };
  86
  87 static void __init __fb_init_irq(void)
  88 {
  89         unsigned int irq;
  90
  91         /*
  92          * setup DC21285 IRQs
  93          */
  94         *CSR_IRQ_DISABLE = -1;
  95         *CSR_FIQ_DISABLE = -1;
  96
  97         for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
  98                 set_irq_chip(irq, &fb_chip);
  99                 set_irq_handler(irq, handle_level_irq);
 100                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 101         }
 102 }
 103
 104 void __init footbridge_init_irq(void)
 105 {
 106         __fb_init_irq();
 107
 108         if (!footbridge_cfn_mode())
 109                 return;
 110
 111         if (machine_is_ebsa285())
 112                 /* The following is dependent on which slot
 113                  * you plug the Southbridge card into.  We
 114                  * currently assume that you plug it into
 115                  * the right-hand most slot.
 116                  */
 117                 isa_init_irq(IRQ_PCI);
 118
 119         if (machine_is_cats())
 120                 isa_init_irq(IRQ_IN2);
 121
 122         if (machine_is_netwinder())
 123                 isa_init_irq(IRQ_IN3);
 124 }
 125
 126 /*
 127  * Common mapping for all systems.  Note that the outbound write flush is
 128  * commented out since there is a "No Fix" problem with it.  Not mapping
 129  * it means that we have extra bullet protection on our feet.
 130  */
 131 static struct map_desc fb_common_io_desc[] __initdata = {
 132         {
 133                 .virtual        = ARMCSR_BASE,
 134                 .pfn            = __phys_to_pfn(DC21285_ARMCSR_BASE),
 135                 .length         = ARMCSR_SIZE,
 136                 .type           = MT_DEVICE,
 137         }, {
 138                 .virtual        = XBUS_BASE,
 139                 .pfn            = __phys_to_pfn(0x40000000),
 140                 .length         = XBUS_SIZE,
 141                 .type           = MT_DEVICE,
 142         }
 143 };
 144
 145 /*
 146  * The mapping when the footbridge is in host mode.  We don't map any of
 147  * this when we are in add-in mode.
 148  */
 149 static struct map_desc ebsa285_host_io_desc[] __initdata = {
 150 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
 151         {
 152                 .virtual        = PCIMEM_BASE,
 153                 .pfn            = __phys_to_pfn(DC21285_PCI_MEM),
 154                 .length         = PCIMEM_SIZE,
 155                 .type           = MT_DEVICE,
 156         }, {
 157                 .virtual        = PCICFG0_BASE,
 158                 .pfn            = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG),
 159                 .length         = PCICFG0_SIZE,
 160                 .type           = MT_DEVICE,
 161         }, {
 162                 .virtual        = PCICFG1_BASE,
 163                 .pfn            = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG),
 164                 .length         = PCICFG1_SIZE,
 165                 .type           = MT_DEVICE,
 166         }, {
 167                 .virtual        = PCIIACK_BASE,
 168                 .pfn            = __phys_to_pfn(DC21285_PCI_IACK),
 169                 .length         = PCIIACK_SIZE,
 170                 .type           = MT_DEVICE,
 171         }, {
 172                 .virtual        = PCIO_BASE,
 173                 .pfn            = __phys_to_pfn(DC21285_PCI_IO),
 174                 .length         = PCIO_SIZE,
 175                 .type           = MT_DEVICE,
 176         },
 177 #endif
 178 };
 179
 180 void __init footbridge_map_io(void)
 181 {
 182         /*
 183          * Set up the common mapping first; we need this to
 184          * determine whether we're in host mode or not.
 185          */
 186         iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
 187
 188         /*
 189          * Now, work out what we've got to map in addition on this
 190          * platform.
 191          */
 192         if (footbridge_cfn_mode())
 193                 iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
 194 }
 195
 196 #ifdef CONFIG_FOOTBRIDGE_ADDIN
 197
 198 /*
 199  * These two functions convert virtual addresses to PCI addresses and PCI
 200  * addresses to virtual addresses.  Note that it is only legal to use these
 201  * on memory obtained via get_zeroed_page or kmalloc.
 202  */
 203 unsigned long __virt_to_bus(unsigned long res)
 204 {
 205         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
 206
 207         return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);
 208 }
 209 EXPORT_SYMBOL(__virt_to_bus);
 210
 211 unsigned long __bus_to_virt(unsigned long res)
 212 {
 213         res -= (*CSR_PCISDRAMBASE & 0xfffffff0);
 214         res += PAGE_OFFSET;
 215
 216         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
 217
 218         return res;
 219 }
 220 EXPORT_SYMBOL(__bus_to_virt);
 221
 222 #endif