arch/arm/mach-footbridge/common.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/arch/arm/mach-footbridge/common.c
   4  *
   5  *  Copyright (C) 1998-2000 Russell King, Dave Gilbert.
   6  */
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/mm.h>
  10 #include <linux/ioport.h>
  11 #include <linux/list.h>
  12 #include <linux/init.h>
  13 #include <linux/io.h>
  14 #include <linux/spinlock.h>
  15 #include <video/vga.h>
  16
  17 #include <asm/page.h>
  18 #include <asm/irq.h>
  19 #include <asm/mach-types.h>
  20 #include <asm/setup.h>
  21 #include <asm/system_misc.h>
  22 #include <asm/hardware/dec21285.h>
  23
  24 #include <asm/mach/irq.h>
  25 #include <asm/mach/map.h>
  26 #include <asm/mach/pci.h>
  27
  28 #include "common.h"
  29
  30 unsigned int mem_fclk_21285 = 50000000;
  31
  32 EXPORT_SYMBOL(mem_fclk_21285);
  33
  34 static int __init early_fclk(char *arg)
  35 {
  36         mem_fclk_21285 = simple_strtoul(arg, NULL, 0);
  37         return 0;
  38 }
  39
  40 early_param("mem_fclk_21285", early_fclk);
  41
  42 static int __init parse_tag_memclk(const struct tag *tag)
  43 {
  44         mem_fclk_21285 = tag->u.memclk.fmemclk;
  45         return 0;
  46 }
  47
  48 __tagtable(ATAG_MEMCLK, parse_tag_memclk);
  49
  50 /*
  51  * Footbridge IRQ translation table
  52  *  Converts from our IRQ numbers into FootBridge masks
  53  */
  54 static const int fb_irq_mask[] = {
  55         IRQ_MASK_UART_RX,       /*  0 */
  56         IRQ_MASK_UART_TX,       /*  1 */
  57         IRQ_MASK_TIMER1,        /*  2 */
  58         IRQ_MASK_TIMER2,        /*  3 */
  59         IRQ_MASK_TIMER3,        /*  4 */
  60         IRQ_MASK_IN0,           /*  5 */
  61         IRQ_MASK_IN1,           /*  6 */
  62         IRQ_MASK_IN2,           /*  7 */
  63         IRQ_MASK_IN3,           /*  8 */
  64         IRQ_MASK_DOORBELLHOST,  /*  9 */
  65         IRQ_MASK_DMA1,          /* 10 */
  66         IRQ_MASK_DMA2,          /* 11 */
  67         IRQ_MASK_PCI,           /* 12 */
  68         IRQ_MASK_SDRAMPARITY,   /* 13 */
  69         IRQ_MASK_I2OINPOST,     /* 14 */
  70         IRQ_MASK_PCI_ABORT,     /* 15 */
  71         IRQ_MASK_PCI_SERR,      /* 16 */
  72         IRQ_MASK_DISCARD_TIMER, /* 17 */
  73         IRQ_MASK_PCI_DPERR,     /* 18 */
  74         IRQ_MASK_PCI_PERR,      /* 19 */
  75 };
  76
  77 static void fb_mask_irq(struct irq_data *d)
  78 {
  79         *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(d->irq)];
  80 }
  81
  82 static void fb_unmask_irq(struct irq_data *d)
  83 {
  84         *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(d->irq)];
  85 }
  86
  87 static struct irq_chip fb_chip = {
  88         .irq_ack        = fb_mask_irq,
  89         .irq_mask       = fb_mask_irq,
  90         .irq_unmask     = fb_unmask_irq,
  91 };
  92
  93 static void __init __fb_init_irq(void)
  94 {
  95         unsigned int irq;
  96
  97         /*
  98          * setup DC21285 IRQs
  99          */
 100         *CSR_IRQ_DISABLE = -1;
 101         *CSR_FIQ_DISABLE = -1;
 102
 103         for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
 104                 irq_set_chip_and_handler(irq, &fb_chip, handle_level_irq);
 105                 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
 106         }
 107 }
 108
 109 void __init footbridge_init_irq(void)
 110 {
 111         __fb_init_irq();
 112
 113         if (!footbridge_cfn_mode())
 114                 return;
 115
 116         if (machine_is_ebsa285())
 117                 /* The following is dependent on which slot
 118                  * you plug the Southbridge card into.  We
 119                  * currently assume that you plug it into
 120                  * the right-hand most slot.
 121                  */
 122                 isa_init_irq(IRQ_PCI);
 123
 124         if (machine_is_cats())
 125                 isa_init_irq(IRQ_IN2);
 126
 127         if (machine_is_netwinder())
 128                 isa_init_irq(IRQ_IN3);
 129 }
 130
 131 /*
 132  * Common mapping for all systems.  Note that the outbound write flush is
 133  * commented out since there is a "No Fix" problem with it.  Not mapping
 134  * it means that we have extra bullet protection on our feet.
 135  */
 136 static struct map_desc fb_common_io_desc[] __initdata = {
 137         {
 138                 .virtual        = ARMCSR_BASE,
 139                 .pfn            = __phys_to_pfn(DC21285_ARMCSR_BASE),
 140                 .length         = ARMCSR_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 #endif
 173 };
 174
 175 void __init footbridge_map_io(void)
 176 {
 177         /*
 178          * Set up the common mapping first; we need this to
 179          * determine whether we're in host mode or not.
 180          */
 181         iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
 182
 183         /*
 184          * Now, work out what we've got to map in addition on this
 185          * platform.
 186          */
 187         if (footbridge_cfn_mode()) {
 188                 iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
 189                 pci_map_io_early(__phys_to_pfn(DC21285_PCI_IO));
 190         }
 191
 192         vga_base = PCIMEM_BASE;
 193 }
 194
 195 void footbridge_restart(enum reboot_mode mode, const char *cmd)
 196 {
 197         if (mode == REBOOT_SOFT) {
 198                 /* Jump into the ROM */
 199                 soft_restart(0x41000000);
 200         } else {
 201                 /*
 202                  * Force the watchdog to do a CPU reset.
 203                  *
 204                  * After making sure that the watchdog is disabled
 205                  * (so we can change the timer registers) we first
 206                  * enable the timer to autoreload itself.  Next, the
 207                  * timer interval is set really short and any
 208                  * current interrupt request is cleared (so we can
 209                  * see an edge transition).  Finally, TIMER4 is
 210                  * enabled as the watchdog.
 211                  */
 212                 *CSR_SA110_CNTL &= ~(1 << 13);
 213                 *CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE |
 214                                    TIMER_CNTL_AUTORELOAD |
 215                                    TIMER_CNTL_DIV16;
 216                 *CSR_TIMER4_LOAD = 0x2;
 217                 *CSR_TIMER4_CLR  = 0;
 218                 *CSR_SA110_CNTL |= (1 << 13);
 219         }
 220 }
 221
 222 #ifdef CONFIG_FOOTBRIDGE_ADDIN
 223
 224 static inline unsigned long fb_bus_sdram_offset(void)
 225 {
 226         return *CSR_PCISDRAMBASE & 0xfffffff0;
 227 }
 228
 229 /*
 230  * These two functions convert virtual addresses to PCI addresses and PCI
 231  * addresses to virtual addresses.  Note that it is only legal to use these
 232  * on memory obtained via get_zeroed_page or kmalloc.
 233  */
 234 unsigned long __virt_to_bus(unsigned long res)
 235 {
 236         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
 237
 238         return res + (fb_bus_sdram_offset() - PAGE_OFFSET);
 239 }
 240 EXPORT_SYMBOL(__virt_to_bus);
 241
 242 unsigned long __bus_to_virt(unsigned long res)
 243 {
 244         res = res - (fb_bus_sdram_offset() - PAGE_OFFSET);
 245
 246         WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
 247
 248         return res;
 249 }
 250 EXPORT_SYMBOL(__bus_to_virt);
 251
 252 unsigned long __pfn_to_bus(unsigned long pfn)
 253 {
 254         return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET);
 255 }
 256 EXPORT_SYMBOL(__pfn_to_bus);
 257
 258 unsigned long __bus_to_pfn(unsigned long bus)
 259 {
 260         return __phys_to_pfn(bus - (fb_bus_sdram_offset() - PHYS_OFFSET));
 261 }
 262 EXPORT_SYMBOL(__bus_to_pfn);
 263
 264 #endif