11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/arch/arm/mach-footbridge/common.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1998-2000 Russell King, Dave Gilbert. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License version 2 as 81da177e4SLinus Torvalds * published by the Free Software Foundation. 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds #include <linux/module.h> 111da177e4SLinus Torvalds #include <linux/types.h> 121da177e4SLinus Torvalds #include <linux/mm.h> 131da177e4SLinus Torvalds #include <linux/ioport.h> 141da177e4SLinus Torvalds #include <linux/list.h> 151da177e4SLinus Torvalds #include <linux/init.h> 16fced80c7SRussell King #include <linux/io.h> 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds #include <asm/pgtable.h> 191da177e4SLinus Torvalds #include <asm/page.h> 201da177e4SLinus Torvalds #include <asm/irq.h> 211da177e4SLinus Torvalds #include <asm/mach-types.h> 221da177e4SLinus Torvalds #include <asm/setup.h> 231da177e4SLinus Torvalds #include <asm/hardware/dec21285.h> 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include <asm/mach/irq.h> 261da177e4SLinus Torvalds #include <asm/mach/map.h> 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #include "common.h" 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds extern void __init isa_init_irq(unsigned int irq); 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds unsigned int mem_fclk_21285 = 50000000; 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds EXPORT_SYMBOL(mem_fclk_21285); 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds static int __init parse_tag_memclk(const struct tag *tag) 371da177e4SLinus Torvalds { 381da177e4SLinus Torvalds mem_fclk_21285 = tag->u.memclk.fmemclk; 391da177e4SLinus Torvalds return 0; 401da177e4SLinus Torvalds } 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds __tagtable(ATAG_MEMCLK, parse_tag_memclk); 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds /* 451da177e4SLinus Torvalds * Footbridge IRQ translation table 461da177e4SLinus Torvalds * Converts from our IRQ numbers into FootBridge masks 471da177e4SLinus Torvalds */ 481da177e4SLinus Torvalds static const int fb_irq_mask[] = { 491da177e4SLinus Torvalds IRQ_MASK_UART_RX, /* 0 */ 501da177e4SLinus Torvalds IRQ_MASK_UART_TX, /* 1 */ 511da177e4SLinus Torvalds IRQ_MASK_TIMER1, /* 2 */ 521da177e4SLinus Torvalds IRQ_MASK_TIMER2, /* 3 */ 531da177e4SLinus Torvalds IRQ_MASK_TIMER3, /* 4 */ 541da177e4SLinus Torvalds IRQ_MASK_IN0, /* 5 */ 551da177e4SLinus Torvalds IRQ_MASK_IN1, /* 6 */ 561da177e4SLinus Torvalds IRQ_MASK_IN2, /* 7 */ 571da177e4SLinus Torvalds IRQ_MASK_IN3, /* 8 */ 581da177e4SLinus Torvalds IRQ_MASK_DOORBELLHOST, /* 9 */ 591da177e4SLinus Torvalds IRQ_MASK_DMA1, /* 10 */ 601da177e4SLinus Torvalds IRQ_MASK_DMA2, /* 11 */ 611da177e4SLinus Torvalds IRQ_MASK_PCI, /* 12 */ 621da177e4SLinus Torvalds IRQ_MASK_SDRAMPARITY, /* 13 */ 631da177e4SLinus Torvalds IRQ_MASK_I2OINPOST, /* 14 */ 641da177e4SLinus Torvalds IRQ_MASK_PCI_ABORT, /* 15 */ 651da177e4SLinus Torvalds IRQ_MASK_PCI_SERR, /* 16 */ 661da177e4SLinus Torvalds IRQ_MASK_DISCARD_TIMER, /* 17 */ 671da177e4SLinus Torvalds IRQ_MASK_PCI_DPERR, /* 18 */ 681da177e4SLinus Torvalds IRQ_MASK_PCI_PERR, /* 19 */ 691da177e4SLinus Torvalds }; 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds static void fb_mask_irq(unsigned int irq) 721da177e4SLinus Torvalds { 731da177e4SLinus Torvalds *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)]; 741da177e4SLinus Torvalds } 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds static void fb_unmask_irq(unsigned int irq) 771da177e4SLinus Torvalds { 781da177e4SLinus Torvalds *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)]; 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 8110dd5ce2SRussell King static struct irq_chip fb_chip = { 821da177e4SLinus Torvalds .ack = fb_mask_irq, 831da177e4SLinus Torvalds .mask = fb_mask_irq, 841da177e4SLinus Torvalds .unmask = fb_unmask_irq, 851da177e4SLinus Torvalds }; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds static void __init __fb_init_irq(void) 881da177e4SLinus Torvalds { 891da177e4SLinus Torvalds unsigned int irq; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* 921da177e4SLinus Torvalds * setup DC21285 IRQs 931da177e4SLinus Torvalds */ 941da177e4SLinus Torvalds *CSR_IRQ_DISABLE = -1; 951da177e4SLinus Torvalds *CSR_FIQ_DISABLE = -1; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) { 981da177e4SLinus Torvalds set_irq_chip(irq, &fb_chip); 9910dd5ce2SRussell King set_irq_handler(irq, handle_level_irq); 1001da177e4SLinus Torvalds set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds } 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds void __init footbridge_init_irq(void) 1051da177e4SLinus Torvalds { 1061da177e4SLinus Torvalds __fb_init_irq(); 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds if (!footbridge_cfn_mode()) 1091da177e4SLinus Torvalds return; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds if (machine_is_ebsa285()) 1121da177e4SLinus Torvalds /* The following is dependent on which slot 1131da177e4SLinus Torvalds * you plug the Southbridge card into. We 1141da177e4SLinus Torvalds * currently assume that you plug it into 1151da177e4SLinus Torvalds * the right-hand most slot. 1161da177e4SLinus Torvalds */ 1171da177e4SLinus Torvalds isa_init_irq(IRQ_PCI); 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds if (machine_is_cats()) 1201da177e4SLinus Torvalds isa_init_irq(IRQ_IN2); 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds if (machine_is_netwinder()) 1231da177e4SLinus Torvalds isa_init_irq(IRQ_IN3); 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* 1271da177e4SLinus Torvalds * Common mapping for all systems. Note that the outbound write flush is 1281da177e4SLinus Torvalds * commented out since there is a "No Fix" problem with it. Not mapping 1291da177e4SLinus Torvalds * it means that we have extra bullet protection on our feet. 1301da177e4SLinus Torvalds */ 1311da177e4SLinus Torvalds static struct map_desc fb_common_io_desc[] __initdata = { 132a427ceefSDeepak Saxena { 133a427ceefSDeepak Saxena .virtual = ARMCSR_BASE, 134865052fdSRussell King .pfn = __phys_to_pfn(DC21285_ARMCSR_BASE), 135a427ceefSDeepak Saxena .length = ARMCSR_SIZE, 1366460177fSRussell King .type = MT_DEVICE, 137a427ceefSDeepak Saxena }, { 138a427ceefSDeepak Saxena .virtual = XBUS_BASE, 139a427ceefSDeepak Saxena .pfn = __phys_to_pfn(0x40000000), 140a427ceefSDeepak Saxena .length = XBUS_SIZE, 1416460177fSRussell King .type = MT_DEVICE, 142a427ceefSDeepak Saxena } 1431da177e4SLinus Torvalds }; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds /* 1461da177e4SLinus Torvalds * The mapping when the footbridge is in host mode. We don't map any of 1471da177e4SLinus Torvalds * this when we are in add-in mode. 1481da177e4SLinus Torvalds */ 1491da177e4SLinus Torvalds static struct map_desc ebsa285_host_io_desc[] __initdata = { 1501da177e4SLinus Torvalds #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST) 151a427ceefSDeepak Saxena { 152a427ceefSDeepak Saxena .virtual = PCIMEM_BASE, 153a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_MEM), 154a427ceefSDeepak Saxena .length = PCIMEM_SIZE, 1556460177fSRussell King .type = MT_DEVICE, 156a427ceefSDeepak Saxena }, { 157a427ceefSDeepak Saxena .virtual = PCICFG0_BASE, 158a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG), 159a427ceefSDeepak Saxena .length = PCICFG0_SIZE, 1606460177fSRussell King .type = MT_DEVICE, 161a427ceefSDeepak Saxena }, { 162a427ceefSDeepak Saxena .virtual = PCICFG1_BASE, 163a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG), 164a427ceefSDeepak Saxena .length = PCICFG1_SIZE, 1656460177fSRussell King .type = MT_DEVICE, 166a427ceefSDeepak Saxena }, { 167a427ceefSDeepak Saxena .virtual = PCIIACK_BASE, 168a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_IACK), 169a427ceefSDeepak Saxena .length = PCIIACK_SIZE, 1706460177fSRussell King .type = MT_DEVICE, 171a427ceefSDeepak Saxena }, { 172a427ceefSDeepak Saxena .virtual = PCIO_BASE, 173a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_IO), 174a427ceefSDeepak Saxena .length = PCIO_SIZE, 1756460177fSRussell King .type = MT_DEVICE, 1766460177fSRussell King }, 1771da177e4SLinus Torvalds #endif 1781da177e4SLinus Torvalds }; 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds void __init footbridge_map_io(void) 1811da177e4SLinus Torvalds { 1821da177e4SLinus Torvalds /* 1831da177e4SLinus Torvalds * Set up the common mapping first; we need this to 1841da177e4SLinus Torvalds * determine whether we're in host mode or not. 1851da177e4SLinus Torvalds */ 1861da177e4SLinus Torvalds iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc)); 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* 1891da177e4SLinus Torvalds * Now, work out what we've got to map in addition on this 1901da177e4SLinus Torvalds * platform. 1911da177e4SLinus Torvalds */ 1921da177e4SLinus Torvalds if (footbridge_cfn_mode()) 1931da177e4SLinus Torvalds iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc)); 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds #ifdef CONFIG_FOOTBRIDGE_ADDIN 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds /* 1991da177e4SLinus Torvalds * These two functions convert virtual addresses to PCI addresses and PCI 2001da177e4SLinus Torvalds * addresses to virtual addresses. Note that it is only legal to use these 2011da177e4SLinus Torvalds * on memory obtained via get_zeroed_page or kmalloc. 2021da177e4SLinus Torvalds */ 2031da177e4SLinus Torvalds unsigned long __virt_to_bus(unsigned long res) 2041da177e4SLinus Torvalds { 2051da177e4SLinus Torvalds WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0); 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds EXPORT_SYMBOL(__virt_to_bus); 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds unsigned long __bus_to_virt(unsigned long res) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds res -= (*CSR_PCISDRAMBASE & 0xfffffff0); 2141da177e4SLinus Torvalds res += PAGE_OFFSET; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds return res; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds EXPORT_SYMBOL(__bus_to_virt); 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds #endif 223