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 269