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                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 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