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 unsigned int mem_fclk_21285 = 50000000; 32 33 EXPORT_SYMBOL(mem_fclk_21285); 34 35 static int __init early_fclk(char *arg) 36 { 37 mem_fclk_21285 = simple_strtoul(arg, NULL, 0); 38 return 0; 39 } 40 41 early_param("mem_fclk_21285", early_fclk); 42 43 static int __init parse_tag_memclk(const struct tag *tag) 44 { 45 mem_fclk_21285 = tag->u.memclk.fmemclk; 46 return 0; 47 } 48 49 __tagtable(ATAG_MEMCLK, parse_tag_memclk); 50 51 /* 52 * Footbridge IRQ translation table 53 * Converts from our IRQ numbers into FootBridge masks 54 */ 55 static const int fb_irq_mask[] = { 56 IRQ_MASK_UART_RX, /* 0 */ 57 IRQ_MASK_UART_TX, /* 1 */ 58 IRQ_MASK_TIMER1, /* 2 */ 59 IRQ_MASK_TIMER2, /* 3 */ 60 IRQ_MASK_TIMER3, /* 4 */ 61 IRQ_MASK_IN0, /* 5 */ 62 IRQ_MASK_IN1, /* 6 */ 63 IRQ_MASK_IN2, /* 7 */ 64 IRQ_MASK_IN3, /* 8 */ 65 IRQ_MASK_DOORBELLHOST, /* 9 */ 66 IRQ_MASK_DMA1, /* 10 */ 67 IRQ_MASK_DMA2, /* 11 */ 68 IRQ_MASK_PCI, /* 12 */ 69 IRQ_MASK_SDRAMPARITY, /* 13 */ 70 IRQ_MASK_I2OINPOST, /* 14 */ 71 IRQ_MASK_PCI_ABORT, /* 15 */ 72 IRQ_MASK_PCI_SERR, /* 16 */ 73 IRQ_MASK_DISCARD_TIMER, /* 17 */ 74 IRQ_MASK_PCI_DPERR, /* 18 */ 75 IRQ_MASK_PCI_PERR, /* 19 */ 76 }; 77 78 static void fb_mask_irq(unsigned int irq) 79 { 80 *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)]; 81 } 82 83 static void fb_unmask_irq(unsigned int irq) 84 { 85 *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)]; 86 } 87 88 static struct irq_chip fb_chip = { 89 .ack = fb_mask_irq, 90 .mask = fb_mask_irq, 91 .unmask = fb_unmask_irq, 92 }; 93 94 static void __init __fb_init_irq(void) 95 { 96 unsigned int irq; 97 98 /* 99 * setup DC21285 IRQs 100 */ 101 *CSR_IRQ_DISABLE = -1; 102 *CSR_FIQ_DISABLE = -1; 103 104 for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) { 105 set_irq_chip(irq, &fb_chip); 106 set_irq_handler(irq, handle_level_irq); 107 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 108 } 109 } 110 111 void __init footbridge_init_irq(void) 112 { 113 __fb_init_irq(); 114 115 if (!footbridge_cfn_mode()) 116 return; 117 118 if (machine_is_ebsa285()) 119 /* The following is dependent on which slot 120 * you plug the Southbridge card into. We 121 * currently assume that you plug it into 122 * the right-hand most slot. 123 */ 124 isa_init_irq(IRQ_PCI); 125 126 if (machine_is_cats()) 127 isa_init_irq(IRQ_IN2); 128 129 if (machine_is_netwinder()) 130 isa_init_irq(IRQ_IN3); 131 } 132 133 /* 134 * Common mapping for all systems. Note that the outbound write flush is 135 * commented out since there is a "No Fix" problem with it. Not mapping 136 * it means that we have extra bullet protection on our feet. 137 */ 138 static struct map_desc fb_common_io_desc[] __initdata = { 139 { 140 .virtual = ARMCSR_BASE, 141 .pfn = __phys_to_pfn(DC21285_ARMCSR_BASE), 142 .length = ARMCSR_SIZE, 143 .type = MT_DEVICE, 144 }, { 145 .virtual = XBUS_BASE, 146 .pfn = __phys_to_pfn(0x40000000), 147 .length = XBUS_SIZE, 148 .type = MT_DEVICE, 149 } 150 }; 151 152 /* 153 * The mapping when the footbridge is in host mode. We don't map any of 154 * this when we are in add-in mode. 155 */ 156 static struct map_desc ebsa285_host_io_desc[] __initdata = { 157 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST) 158 { 159 .virtual = PCIMEM_BASE, 160 .pfn = __phys_to_pfn(DC21285_PCI_MEM), 161 .length = PCIMEM_SIZE, 162 .type = MT_DEVICE, 163 }, { 164 .virtual = PCICFG0_BASE, 165 .pfn = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG), 166 .length = PCICFG0_SIZE, 167 .type = MT_DEVICE, 168 }, { 169 .virtual = PCICFG1_BASE, 170 .pfn = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG), 171 .length = PCICFG1_SIZE, 172 .type = MT_DEVICE, 173 }, { 174 .virtual = PCIIACK_BASE, 175 .pfn = __phys_to_pfn(DC21285_PCI_IACK), 176 .length = PCIIACK_SIZE, 177 .type = MT_DEVICE, 178 }, { 179 .virtual = PCIO_BASE, 180 .pfn = __phys_to_pfn(DC21285_PCI_IO), 181 .length = PCIO_SIZE, 182 .type = MT_DEVICE, 183 }, 184 #endif 185 }; 186 187 void __init footbridge_map_io(void) 188 { 189 /* 190 * Set up the common mapping first; we need this to 191 * determine whether we're in host mode or not. 192 */ 193 iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc)); 194 195 /* 196 * Now, work out what we've got to map in addition on this 197 * platform. 198 */ 199 if (footbridge_cfn_mode()) 200 iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc)); 201 } 202 203 #ifdef CONFIG_FOOTBRIDGE_ADDIN 204 205 static inline unsigned long fb_bus_sdram_offset(void) 206 { 207 return *CSR_PCISDRAMBASE & 0xfffffff0; 208 } 209 210 /* 211 * These two functions convert virtual addresses to PCI addresses and PCI 212 * addresses to virtual addresses. Note that it is only legal to use these 213 * on memory obtained via get_zeroed_page or kmalloc. 214 */ 215 unsigned long __virt_to_bus(unsigned long res) 216 { 217 WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 218 219 return res + (fb_bus_sdram_offset() - PAGE_OFFSET); 220 } 221 EXPORT_SYMBOL(__virt_to_bus); 222 223 unsigned long __bus_to_virt(unsigned long res) 224 { 225 res = res - (fb_bus_sdram_offset() - PAGE_OFFSET); 226 227 WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 228 229 return res; 230 } 231 EXPORT_SYMBOL(__bus_to_virt); 232 233 unsigned long __pfn_to_bus(unsigned long pfn) 234 { 235 return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET); 236 } 237 EXPORT_SYMBOL(__pfn_to_bus); 238 239 unsigned long __bus_to_pfn(unsigned long bus) 240 { 241 return __phys_to_pfn(bus - (fb_bus_sdram_offset() - PHYS_OFFSET)); 242 } 243 EXPORT_SYMBOL(__bus_to_pfn); 244 245 #endif 246