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/config.h>
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/mm.h>
  14 #include <linux/ioport.h>
  15 #include <linux/list.h>
  16 #include <linux/init.h>
  17
  18 #include <asm/pgtable.h>
  19 #include <asm/page.h>
  20 #include <asm/irq.h>
  21 #include <asm/io.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 irqchip 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, do_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  { ARMCSR_BASE,  DC21285_ARMCSR_BASE,       ARMCSR_SIZE,  MT_DEVICE },
 134  { XBUS_BASE,    0x40000000,                XBUS_SIZE,    MT_DEVICE }
 135 };
 136
 137 /*
 138  * The mapping when the footbridge is in host mode.  We don't map any of
 139  * this when we are in add-in mode.
 140  */
 141 static struct map_desc ebsa285_host_io_desc[] __initdata = {
 142 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
 143  { PCIMEM_BASE,  DC21285_PCI_MEM,           PCIMEM_SIZE,  MT_DEVICE },
 144  { PCICFG0_BASE, DC21285_PCI_TYPE_0_CONFIG, PCICFG0_SIZE, MT_DEVICE },
 145  { PCICFG1_BASE, DC21285_PCI_TYPE_1_CONFIG, PCICFG1_SIZE, MT_DEVICE },
 146  { PCIIACK_BASE, DC21285_PCI_IACK,          PCIIACK_SIZE, MT_DEVICE },
 147  { PCIO_BASE,    DC21285_PCI_IO,            PCIO_SIZE,    MT_DEVICE }
 148 #endif
 149 };
 150
 151 /*
 152  * The CO-ebsa285 mapping.
 153  */
 154 static struct map_desc co285_io_desc[] __initdata = {
 155 #ifdef CONFIG_ARCH_CO285
 156  { PCIO_BASE,    DC21285_PCI_IO,            PCIO_SIZE,    MT_DEVICE },
 157  { PCIMEM_BASE,  DC21285_PCI_MEM,           PCIMEM_SIZE,  MT_DEVICE }
 158 #endif
 159 };
 160
 161 void __init footbridge_map_io(void)
 162 {
 163         /*
 164          * Set up the common mapping first; we need this to
 165          * determine whether we're in host mode or not.
 166          */
 167         iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
 168
 169         /*
 170          * Now, work out what we've got to map in addition on this
 171          * platform.
 172          */
 173         if (machine_is_co285())
 174                 iotable_init(co285_io_desc, ARRAY_SIZE(co285_io_desc));
 175         if (footbridge_cfn_mode())
 176                 iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
 177 }
 178
 179 #ifdef CONFIG_FOOTBRIDGE_ADDIN
 180
 181 /*
 182  * These two functions convert virtual addresses to PCI addresses and PCI
 183  * addresses to virtual addresses.  Note that it is only legal to use these
 184  * on memory obtained via get_zeroed_page or kmalloc.
 185  */
 186 unsigned long __virt_to_bus(unsigned long res)
 187 {
 188         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
 189
 190         return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);
 191 }
 192 EXPORT_SYMBOL(__virt_to_bus);
 193
 194 unsigned long __bus_to_virt(unsigned long res)
 195 {
 196         res -= (*CSR_PCISDRAMBASE & 0xfffffff0);
 197         res += PAGE_OFFSET;
 198
 199         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
 200
 201         return res;
 202 }
 203 EXPORT_SYMBOL(__bus_to_virt);
 204
 205 #endif