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> 1770d13e08SRussell King #include <linux/spinlock.h> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <asm/pgtable.h> 201da177e4SLinus Torvalds #include <asm/page.h> 211da177e4SLinus Torvalds #include <asm/irq.h> 221da177e4SLinus Torvalds #include <asm/mach-types.h> 231da177e4SLinus Torvalds #include <asm/setup.h> 249f97da78SDavid Howells #include <asm/system_misc.h> 251da177e4SLinus Torvalds #include <asm/hardware/dec21285.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include <asm/mach/irq.h> 281da177e4SLinus Torvalds #include <asm/mach/map.h> 298ef6e620SRob Herring #include <asm/mach/pci.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include "common.h" 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds unsigned int mem_fclk_21285 = 50000000; 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds EXPORT_SYMBOL(mem_fclk_21285); 361da177e4SLinus Torvalds 372b0d8c25SJeremy Kerr static int __init early_fclk(char *arg) 38613e09b4SRussell King { 392b0d8c25SJeremy Kerr mem_fclk_21285 = simple_strtoul(arg, NULL, 0); 402b0d8c25SJeremy Kerr return 0; 41613e09b4SRussell King } 42613e09b4SRussell King 432b0d8c25SJeremy Kerr early_param("mem_fclk_21285", early_fclk); 44613e09b4SRussell King 451da177e4SLinus Torvalds static int __init parse_tag_memclk(const struct tag *tag) 461da177e4SLinus Torvalds { 471da177e4SLinus Torvalds mem_fclk_21285 = tag->u.memclk.fmemclk; 481da177e4SLinus Torvalds return 0; 491da177e4SLinus Torvalds } 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds __tagtable(ATAG_MEMCLK, parse_tag_memclk); 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds /* 541da177e4SLinus Torvalds * Footbridge IRQ translation table 551da177e4SLinus Torvalds * Converts from our IRQ numbers into FootBridge masks 561da177e4SLinus Torvalds */ 571da177e4SLinus Torvalds static const int fb_irq_mask[] = { 581da177e4SLinus Torvalds IRQ_MASK_UART_RX, /* 0 */ 591da177e4SLinus Torvalds IRQ_MASK_UART_TX, /* 1 */ 601da177e4SLinus Torvalds IRQ_MASK_TIMER1, /* 2 */ 611da177e4SLinus Torvalds IRQ_MASK_TIMER2, /* 3 */ 621da177e4SLinus Torvalds IRQ_MASK_TIMER3, /* 4 */ 631da177e4SLinus Torvalds IRQ_MASK_IN0, /* 5 */ 641da177e4SLinus Torvalds IRQ_MASK_IN1, /* 6 */ 651da177e4SLinus Torvalds IRQ_MASK_IN2, /* 7 */ 661da177e4SLinus Torvalds IRQ_MASK_IN3, /* 8 */ 671da177e4SLinus Torvalds IRQ_MASK_DOORBELLHOST, /* 9 */ 681da177e4SLinus Torvalds IRQ_MASK_DMA1, /* 10 */ 691da177e4SLinus Torvalds IRQ_MASK_DMA2, /* 11 */ 701da177e4SLinus Torvalds IRQ_MASK_PCI, /* 12 */ 711da177e4SLinus Torvalds IRQ_MASK_SDRAMPARITY, /* 13 */ 721da177e4SLinus Torvalds IRQ_MASK_I2OINPOST, /* 14 */ 731da177e4SLinus Torvalds IRQ_MASK_PCI_ABORT, /* 15 */ 741da177e4SLinus Torvalds IRQ_MASK_PCI_SERR, /* 16 */ 751da177e4SLinus Torvalds IRQ_MASK_DISCARD_TIMER, /* 17 */ 761da177e4SLinus Torvalds IRQ_MASK_PCI_DPERR, /* 18 */ 771da177e4SLinus Torvalds IRQ_MASK_PCI_PERR, /* 19 */ 781da177e4SLinus Torvalds }; 791da177e4SLinus Torvalds 80dc2caf6cSLennert Buytenhek static void fb_mask_irq(struct irq_data *d) 811da177e4SLinus Torvalds { 82dc2caf6cSLennert Buytenhek *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(d->irq)]; 831da177e4SLinus Torvalds } 841da177e4SLinus Torvalds 85dc2caf6cSLennert Buytenhek static void fb_unmask_irq(struct irq_data *d) 861da177e4SLinus Torvalds { 87dc2caf6cSLennert Buytenhek *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(d->irq)]; 881da177e4SLinus Torvalds } 891da177e4SLinus Torvalds 9010dd5ce2SRussell King static struct irq_chip fb_chip = { 91dc2caf6cSLennert Buytenhek .irq_ack = fb_mask_irq, 92dc2caf6cSLennert Buytenhek .irq_mask = fb_mask_irq, 93dc2caf6cSLennert Buytenhek .irq_unmask = fb_unmask_irq, 941da177e4SLinus Torvalds }; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds static void __init __fb_init_irq(void) 971da177e4SLinus Torvalds { 981da177e4SLinus Torvalds unsigned int irq; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* 1011da177e4SLinus Torvalds * setup DC21285 IRQs 1021da177e4SLinus Torvalds */ 1031da177e4SLinus Torvalds *CSR_IRQ_DISABLE = -1; 1041da177e4SLinus Torvalds *CSR_FIQ_DISABLE = -1; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) { 107f38c02f3SThomas Gleixner irq_set_chip_and_handler(irq, &fb_chip, handle_level_irq); 1081da177e4SLinus Torvalds set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds void __init footbridge_init_irq(void) 1131da177e4SLinus Torvalds { 1141da177e4SLinus Torvalds __fb_init_irq(); 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds if (!footbridge_cfn_mode()) 1171da177e4SLinus Torvalds return; 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds if (machine_is_ebsa285()) 1201da177e4SLinus Torvalds /* The following is dependent on which slot 1211da177e4SLinus Torvalds * you plug the Southbridge card into. We 1221da177e4SLinus Torvalds * currently assume that you plug it into 1231da177e4SLinus Torvalds * the right-hand most slot. 1241da177e4SLinus Torvalds */ 1251da177e4SLinus Torvalds isa_init_irq(IRQ_PCI); 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds if (machine_is_cats()) 1281da177e4SLinus Torvalds isa_init_irq(IRQ_IN2); 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds if (machine_is_netwinder()) 1311da177e4SLinus Torvalds isa_init_irq(IRQ_IN3); 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* 1351da177e4SLinus Torvalds * Common mapping for all systems. Note that the outbound write flush is 1361da177e4SLinus Torvalds * commented out since there is a "No Fix" problem with it. Not mapping 1371da177e4SLinus Torvalds * it means that we have extra bullet protection on our feet. 1381da177e4SLinus Torvalds */ 1391da177e4SLinus Torvalds static struct map_desc fb_common_io_desc[] __initdata = { 140a427ceefSDeepak Saxena { 141a427ceefSDeepak Saxena .virtual = ARMCSR_BASE, 142865052fdSRussell King .pfn = __phys_to_pfn(DC21285_ARMCSR_BASE), 143a427ceefSDeepak Saxena .length = ARMCSR_SIZE, 1446460177fSRussell King .type = MT_DEVICE, 145a427ceefSDeepak Saxena }, { 146a427ceefSDeepak Saxena .virtual = XBUS_BASE, 147a427ceefSDeepak Saxena .pfn = __phys_to_pfn(0x40000000), 148a427ceefSDeepak Saxena .length = XBUS_SIZE, 1496460177fSRussell King .type = MT_DEVICE, 150a427ceefSDeepak Saxena } 1511da177e4SLinus Torvalds }; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds /* 1541da177e4SLinus Torvalds * The mapping when the footbridge is in host mode. We don't map any of 1551da177e4SLinus Torvalds * this when we are in add-in mode. 1561da177e4SLinus Torvalds */ 1571da177e4SLinus Torvalds static struct map_desc ebsa285_host_io_desc[] __initdata = { 1581da177e4SLinus Torvalds #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST) 159a427ceefSDeepak Saxena { 160a427ceefSDeepak Saxena .virtual = PCIMEM_BASE, 161a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_MEM), 162a427ceefSDeepak Saxena .length = PCIMEM_SIZE, 1636460177fSRussell King .type = MT_DEVICE, 164a427ceefSDeepak Saxena }, { 165a427ceefSDeepak Saxena .virtual = PCICFG0_BASE, 166a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG), 167a427ceefSDeepak Saxena .length = PCICFG0_SIZE, 1686460177fSRussell King .type = MT_DEVICE, 169a427ceefSDeepak Saxena }, { 170a427ceefSDeepak Saxena .virtual = PCICFG1_BASE, 171a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG), 172a427ceefSDeepak Saxena .length = PCICFG1_SIZE, 1736460177fSRussell King .type = MT_DEVICE, 174a427ceefSDeepak Saxena }, { 175a427ceefSDeepak Saxena .virtual = PCIIACK_BASE, 176a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_IACK), 177a427ceefSDeepak Saxena .length = PCIIACK_SIZE, 1786460177fSRussell King .type = MT_DEVICE, 1796460177fSRussell King }, 1801da177e4SLinus Torvalds #endif 1811da177e4SLinus Torvalds }; 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds void __init footbridge_map_io(void) 1841da177e4SLinus Torvalds { 1851da177e4SLinus Torvalds /* 1861da177e4SLinus Torvalds * Set up the common mapping first; we need this to 1871da177e4SLinus Torvalds * determine whether we're in host mode or not. 1881da177e4SLinus Torvalds */ 1891da177e4SLinus Torvalds iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc)); 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds /* 1921da177e4SLinus Torvalds * Now, work out what we've got to map in addition on this 1931da177e4SLinus Torvalds * platform. 1941da177e4SLinus Torvalds */ 1958ef6e620SRob Herring if (footbridge_cfn_mode()) { 1961da177e4SLinus Torvalds iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc)); 1978ef6e620SRob Herring pci_map_io_early(__phys_to_pfn(DC21285_PCI_IO)); 1988ef6e620SRob Herring } 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds 2017b6d864bSRobin Holt void footbridge_restart(enum reboot_mode mode, const char *cmd) 2026fca1e17SRussell King { 2037b6d864bSRobin Holt if (mode == REBOOT_SOFT) { 2046fca1e17SRussell King /* Jump into the ROM */ 2056fca1e17SRussell King soft_restart(0x41000000); 2066fca1e17SRussell King } else { 2076fca1e17SRussell King /* 2086fca1e17SRussell King * Force the watchdog to do a CPU reset. 2096fca1e17SRussell King * 2106fca1e17SRussell King * After making sure that the watchdog is disabled 2116fca1e17SRussell King * (so we can change the timer registers) we first 2126fca1e17SRussell King * enable the timer to autoreload itself. Next, the 2136fca1e17SRussell King * timer interval is set really short and any 2146fca1e17SRussell King * current interrupt request is cleared (so we can 2156fca1e17SRussell King * see an edge transition). Finally, TIMER4 is 2166fca1e17SRussell King * enabled as the watchdog. 2176fca1e17SRussell King */ 2186fca1e17SRussell King *CSR_SA110_CNTL &= ~(1 << 13); 2196fca1e17SRussell King *CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE | 2206fca1e17SRussell King TIMER_CNTL_AUTORELOAD | 2216fca1e17SRussell King TIMER_CNTL_DIV16; 2226fca1e17SRussell King *CSR_TIMER4_LOAD = 0x2; 2236fca1e17SRussell King *CSR_TIMER4_CLR = 0; 2246fca1e17SRussell King *CSR_SA110_CNTL |= (1 << 13); 2256fca1e17SRussell King } 2266fca1e17SRussell King } 2276fca1e17SRussell King 2281da177e4SLinus Torvalds #ifdef CONFIG_FOOTBRIDGE_ADDIN 2291da177e4SLinus Torvalds 230c7baab5dSRussell King static inline unsigned long fb_bus_sdram_offset(void) 231c7baab5dSRussell King { 232c7baab5dSRussell King return *CSR_PCISDRAMBASE & 0xfffffff0; 233c7baab5dSRussell King } 234c7baab5dSRussell King 2351da177e4SLinus Torvalds /* 2361da177e4SLinus Torvalds * These two functions convert virtual addresses to PCI addresses and PCI 2371da177e4SLinus Torvalds * addresses to virtual addresses. Note that it is only legal to use these 2381da177e4SLinus Torvalds * on memory obtained via get_zeroed_page or kmalloc. 2391da177e4SLinus Torvalds */ 2401da177e4SLinus Torvalds unsigned long __virt_to_bus(unsigned long res) 2411da177e4SLinus Torvalds { 2421da177e4SLinus Torvalds WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 2431da177e4SLinus Torvalds 244c7baab5dSRussell King return res + (fb_bus_sdram_offset() - PAGE_OFFSET); 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds EXPORT_SYMBOL(__virt_to_bus); 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds unsigned long __bus_to_virt(unsigned long res) 2491da177e4SLinus Torvalds { 250c7baab5dSRussell King res = res - (fb_bus_sdram_offset() - PAGE_OFFSET); 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds return res; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds EXPORT_SYMBOL(__bus_to_virt); 2571da177e4SLinus Torvalds 258c7baab5dSRussell King unsigned long __pfn_to_bus(unsigned long pfn) 259c7baab5dSRussell King { 26064dd3b74Swanzongshun return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET); 261c7baab5dSRussell King } 262c7baab5dSRussell King EXPORT_SYMBOL(__pfn_to_bus); 263c7baab5dSRussell King 264c7baab5dSRussell King unsigned long __bus_to_pfn(unsigned long bus) 265c7baab5dSRussell King { 266c7baab5dSRussell King return __phys_to_pfn(bus - (fb_bus_sdram_offset() - PHYS_OFFSET)); 267c7baab5dSRussell King } 268c7baab5dSRussell King EXPORT_SYMBOL(__bus_to_pfn); 269c7baab5dSRussell King 2701da177e4SLinus Torvalds #endif 271