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 void __init early_fclk(char **arg) 38 { 39 mem_fclk_21285 = simple_strtoul(*arg, arg, 0); 40 } 41 42 __early_param("mem_fclk_21285=", early_fclk); 43 44 static int __init parse_tag_memclk(const struct tag *tag) 45 { 46 mem_fclk_21285 = tag->u.memclk.fmemclk; 47 return 0; 48 } 49 50 __tagtable(ATAG_MEMCLK, parse_tag_memclk); 51 52 /* 53 * Footbridge IRQ translation table 54 * Converts from our IRQ numbers into FootBridge masks 55 */ 56 static const int fb_irq_mask[] = { 57 IRQ_MASK_UART_RX, /* 0 */ 58 IRQ_MASK_UART_TX, /* 1 */ 59 IRQ_MASK_TIMER1, /* 2 */ 60 IRQ_MASK_TIMER2, /* 3 */ 61 IRQ_MASK_TIMER3, /* 4 */ 62 IRQ_MASK_IN0, /* 5 */ 63 IRQ_MASK_IN1, /* 6 */ 64 IRQ_MASK_IN2, /* 7 */ 65 IRQ_MASK_IN3, /* 8 */ 66 IRQ_MASK_DOORBELLHOST, /* 9 */ 67 IRQ_MASK_DMA1, /* 10 */ 68 IRQ_MASK_DMA2, /* 11 */ 69 IRQ_MASK_PCI, /* 12 */ 70 IRQ_MASK_SDRAMPARITY, /* 13 */ 71 IRQ_MASK_I2OINPOST, /* 14 */ 72 IRQ_MASK_PCI_ABORT, /* 15 */ 73 IRQ_MASK_PCI_SERR, /* 16 */ 74 IRQ_MASK_DISCARD_TIMER, /* 17 */ 75 IRQ_MASK_PCI_DPERR, /* 18 */ 76 IRQ_MASK_PCI_PERR, /* 19 */ 77 }; 78 79 static void fb_mask_irq(unsigned int irq) 80 { 81 *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)]; 82 } 83 84 static void fb_unmask_irq(unsigned int irq) 85 { 86 *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)]; 87 } 88 89 static struct irq_chip fb_chip = { 90 .ack = fb_mask_irq, 91 .mask = fb_mask_irq, 92 .unmask = fb_unmask_irq, 93 }; 94 95 static void __init __fb_init_irq(void) 96 { 97 unsigned int irq; 98 99 /* 100 * setup DC21285 IRQs 101 */ 102 *CSR_IRQ_DISABLE = -1; 103 *CSR_FIQ_DISABLE = -1; 104 105 for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) { 106 set_irq_chip(irq, &fb_chip); 107 set_irq_handler(irq, handle_level_irq); 108 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 109 } 110 } 111 112 void __init footbridge_init_irq(void) 113 { 114 __fb_init_irq(); 115 116 if (!footbridge_cfn_mode()) 117 return; 118 119 if (machine_is_ebsa285()) 120 /* The following is dependent on which slot 121 * you plug the Southbridge card into. We 122 * currently assume that you plug it into 123 * the right-hand most slot. 124 */ 125 isa_init_irq(IRQ_PCI); 126 127 if (machine_is_cats()) 128 isa_init_irq(IRQ_IN2); 129 130 if (machine_is_netwinder()) 131 isa_init_irq(IRQ_IN3); 132 } 133 134 /* 135 * Common mapping for all systems. Note that the outbound write flush is 136 * commented out since there is a "No Fix" problem with it. Not mapping 137 * it means that we have extra bullet protection on our feet. 138 */ 139 static struct map_desc fb_common_io_desc[] __initdata = { 140 { 141 .virtual = ARMCSR_BASE, 142 .pfn = __phys_to_pfn(DC21285_ARMCSR_BASE), 143 .length = ARMCSR_SIZE, 144 .type = MT_DEVICE, 145 }, { 146 .virtual = XBUS_BASE, 147 .pfn = __phys_to_pfn(0x40000000), 148 .length = XBUS_SIZE, 149 .type = MT_DEVICE, 150 } 151 }; 152 153 /* 154 * The mapping when the footbridge is in host mode. We don't map any of 155 * this when we are in add-in mode. 156 */ 157 static struct map_desc ebsa285_host_io_desc[] __initdata = { 158 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST) 159 { 160 .virtual = PCIMEM_BASE, 161 .pfn = __phys_to_pfn(DC21285_PCI_MEM), 162 .length = PCIMEM_SIZE, 163 .type = MT_DEVICE, 164 }, { 165 .virtual = PCICFG0_BASE, 166 .pfn = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG), 167 .length = PCICFG0_SIZE, 168 .type = MT_DEVICE, 169 }, { 170 .virtual = PCICFG1_BASE, 171 .pfn = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG), 172 .length = PCICFG1_SIZE, 173 .type = MT_DEVICE, 174 }, { 175 .virtual = PCIIACK_BASE, 176 .pfn = __phys_to_pfn(DC21285_PCI_IACK), 177 .length = PCIIACK_SIZE, 178 .type = MT_DEVICE, 179 }, { 180 .virtual = PCIO_BASE, 181 .pfn = __phys_to_pfn(DC21285_PCI_IO), 182 .length = PCIO_SIZE, 183 .type = MT_DEVICE, 184 }, 185 #endif 186 }; 187 188 void __init footbridge_map_io(void) 189 { 190 /* 191 * Set up the common mapping first; we need this to 192 * determine whether we're in host mode or not. 193 */ 194 iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc)); 195 196 /* 197 * Now, work out what we've got to map in addition on this 198 * platform. 199 */ 200 if (footbridge_cfn_mode()) 201 iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc)); 202 } 203 204 #ifdef CONFIG_FOOTBRIDGE_ADDIN 205 206 /* 207 * These two functions convert virtual addresses to PCI addresses and PCI 208 * addresses to virtual addresses. Note that it is only legal to use these 209 * on memory obtained via get_zeroed_page or kmalloc. 210 */ 211 unsigned long __virt_to_bus(unsigned long res) 212 { 213 WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 214 215 return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0); 216 } 217 EXPORT_SYMBOL(__virt_to_bus); 218 219 unsigned long __bus_to_virt(unsigned long res) 220 { 221 res -= (*CSR_PCISDRAMBASE & 0xfffffff0); 222 res += PAGE_OFFSET; 223 224 WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 225 226 return res; 227 } 228 EXPORT_SYMBOL(__bus_to_virt); 229 230 #endif 231