1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/arch/arm/mach-footbridge/common.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 1998-2000 Russell King, Dave Gilbert. 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds #include <linux/module.h> 81da177e4SLinus Torvalds #include <linux/types.h> 91da177e4SLinus Torvalds #include <linux/mm.h> 101da177e4SLinus Torvalds #include <linux/ioport.h> 111da177e4SLinus Torvalds #include <linux/list.h> 121da177e4SLinus Torvalds #include <linux/init.h> 13fced80c7SRussell King #include <linux/io.h> 1470d13e08SRussell King #include <linux/spinlock.h> 1543659222SRussell King #include <video/vga.h> 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds #include <asm/pgtable.h> 181da177e4SLinus Torvalds #include <asm/page.h> 191da177e4SLinus Torvalds #include <asm/irq.h> 201da177e4SLinus Torvalds #include <asm/mach-types.h> 211da177e4SLinus Torvalds #include <asm/setup.h> 229f97da78SDavid Howells #include <asm/system_misc.h> 231da177e4SLinus Torvalds #include <asm/hardware/dec21285.h> 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include <asm/mach/irq.h> 261da177e4SLinus Torvalds #include <asm/mach/map.h> 278ef6e620SRob Herring #include <asm/mach/pci.h> 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #include "common.h" 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds unsigned int mem_fclk_21285 = 50000000; 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds EXPORT_SYMBOL(mem_fclk_21285); 341da177e4SLinus Torvalds 352b0d8c25SJeremy Kerr static int __init early_fclk(char *arg) 36613e09b4SRussell King { 372b0d8c25SJeremy Kerr mem_fclk_21285 = simple_strtoul(arg, NULL, 0); 382b0d8c25SJeremy Kerr return 0; 39613e09b4SRussell King } 40613e09b4SRussell King 412b0d8c25SJeremy Kerr early_param("mem_fclk_21285", early_fclk); 42613e09b4SRussell King 431da177e4SLinus Torvalds static int __init parse_tag_memclk(const struct tag *tag) 441da177e4SLinus Torvalds { 451da177e4SLinus Torvalds mem_fclk_21285 = tag->u.memclk.fmemclk; 461da177e4SLinus Torvalds return 0; 471da177e4SLinus Torvalds } 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds __tagtable(ATAG_MEMCLK, parse_tag_memclk); 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds /* 521da177e4SLinus Torvalds * Footbridge IRQ translation table 531da177e4SLinus Torvalds * Converts from our IRQ numbers into FootBridge masks 541da177e4SLinus Torvalds */ 551da177e4SLinus Torvalds static const int fb_irq_mask[] = { 561da177e4SLinus Torvalds IRQ_MASK_UART_RX, /* 0 */ 571da177e4SLinus Torvalds IRQ_MASK_UART_TX, /* 1 */ 581da177e4SLinus Torvalds IRQ_MASK_TIMER1, /* 2 */ 591da177e4SLinus Torvalds IRQ_MASK_TIMER2, /* 3 */ 601da177e4SLinus Torvalds IRQ_MASK_TIMER3, /* 4 */ 611da177e4SLinus Torvalds IRQ_MASK_IN0, /* 5 */ 621da177e4SLinus Torvalds IRQ_MASK_IN1, /* 6 */ 631da177e4SLinus Torvalds IRQ_MASK_IN2, /* 7 */ 641da177e4SLinus Torvalds IRQ_MASK_IN3, /* 8 */ 651da177e4SLinus Torvalds IRQ_MASK_DOORBELLHOST, /* 9 */ 661da177e4SLinus Torvalds IRQ_MASK_DMA1, /* 10 */ 671da177e4SLinus Torvalds IRQ_MASK_DMA2, /* 11 */ 681da177e4SLinus Torvalds IRQ_MASK_PCI, /* 12 */ 691da177e4SLinus Torvalds IRQ_MASK_SDRAMPARITY, /* 13 */ 701da177e4SLinus Torvalds IRQ_MASK_I2OINPOST, /* 14 */ 711da177e4SLinus Torvalds IRQ_MASK_PCI_ABORT, /* 15 */ 721da177e4SLinus Torvalds IRQ_MASK_PCI_SERR, /* 16 */ 731da177e4SLinus Torvalds IRQ_MASK_DISCARD_TIMER, /* 17 */ 741da177e4SLinus Torvalds IRQ_MASK_PCI_DPERR, /* 18 */ 751da177e4SLinus Torvalds IRQ_MASK_PCI_PERR, /* 19 */ 761da177e4SLinus Torvalds }; 771da177e4SLinus Torvalds 78dc2caf6cSLennert Buytenhek static void fb_mask_irq(struct irq_data *d) 791da177e4SLinus Torvalds { 80dc2caf6cSLennert Buytenhek *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(d->irq)]; 811da177e4SLinus Torvalds } 821da177e4SLinus Torvalds 83dc2caf6cSLennert Buytenhek static void fb_unmask_irq(struct irq_data *d) 841da177e4SLinus Torvalds { 85dc2caf6cSLennert Buytenhek *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(d->irq)]; 861da177e4SLinus Torvalds } 871da177e4SLinus Torvalds 8810dd5ce2SRussell King static struct irq_chip fb_chip = { 89dc2caf6cSLennert Buytenhek .irq_ack = fb_mask_irq, 90dc2caf6cSLennert Buytenhek .irq_mask = fb_mask_irq, 91dc2caf6cSLennert Buytenhek .irq_unmask = fb_unmask_irq, 921da177e4SLinus Torvalds }; 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds static void __init __fb_init_irq(void) 951da177e4SLinus Torvalds { 961da177e4SLinus Torvalds unsigned int irq; 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds /* 991da177e4SLinus Torvalds * setup DC21285 IRQs 1001da177e4SLinus Torvalds */ 1011da177e4SLinus Torvalds *CSR_IRQ_DISABLE = -1; 1021da177e4SLinus Torvalds *CSR_FIQ_DISABLE = -1; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) { 105f38c02f3SThomas Gleixner irq_set_chip_and_handler(irq, &fb_chip, handle_level_irq); 106e8d36d5dSRob Herring irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds void __init footbridge_init_irq(void) 1111da177e4SLinus Torvalds { 1121da177e4SLinus Torvalds __fb_init_irq(); 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds if (!footbridge_cfn_mode()) 1151da177e4SLinus Torvalds return; 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds if (machine_is_ebsa285()) 1181da177e4SLinus Torvalds /* The following is dependent on which slot 1191da177e4SLinus Torvalds * you plug the Southbridge card into. We 1201da177e4SLinus Torvalds * currently assume that you plug it into 1211da177e4SLinus Torvalds * the right-hand most slot. 1221da177e4SLinus Torvalds */ 1231da177e4SLinus Torvalds isa_init_irq(IRQ_PCI); 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds if (machine_is_cats()) 1261da177e4SLinus Torvalds isa_init_irq(IRQ_IN2); 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds if (machine_is_netwinder()) 1291da177e4SLinus Torvalds isa_init_irq(IRQ_IN3); 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* 1331da177e4SLinus Torvalds * Common mapping for all systems. Note that the outbound write flush is 1341da177e4SLinus Torvalds * commented out since there is a "No Fix" problem with it. Not mapping 1351da177e4SLinus Torvalds * it means that we have extra bullet protection on our feet. 1361da177e4SLinus Torvalds */ 1371da177e4SLinus Torvalds static struct map_desc fb_common_io_desc[] __initdata = { 138a427ceefSDeepak Saxena { 139a427ceefSDeepak Saxena .virtual = ARMCSR_BASE, 140865052fdSRussell King .pfn = __phys_to_pfn(DC21285_ARMCSR_BASE), 141a427ceefSDeepak Saxena .length = ARMCSR_SIZE, 1426460177fSRussell King .type = MT_DEVICE, 143a427ceefSDeepak Saxena } 1441da177e4SLinus Torvalds }; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds /* 1471da177e4SLinus Torvalds * The mapping when the footbridge is in host mode. We don't map any of 1481da177e4SLinus Torvalds * this when we are in add-in mode. 1491da177e4SLinus Torvalds */ 1501da177e4SLinus Torvalds static struct map_desc ebsa285_host_io_desc[] __initdata = { 1511da177e4SLinus Torvalds #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST) 152a427ceefSDeepak Saxena { 153a427ceefSDeepak Saxena .virtual = PCIMEM_BASE, 154a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_MEM), 155a427ceefSDeepak Saxena .length = PCIMEM_SIZE, 1566460177fSRussell King .type = MT_DEVICE, 157a427ceefSDeepak Saxena }, { 158a427ceefSDeepak Saxena .virtual = PCICFG0_BASE, 159a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG), 160a427ceefSDeepak Saxena .length = PCICFG0_SIZE, 1616460177fSRussell King .type = MT_DEVICE, 162a427ceefSDeepak Saxena }, { 163a427ceefSDeepak Saxena .virtual = PCICFG1_BASE, 164a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG), 165a427ceefSDeepak Saxena .length = PCICFG1_SIZE, 1666460177fSRussell King .type = MT_DEVICE, 167a427ceefSDeepak Saxena }, { 168a427ceefSDeepak Saxena .virtual = PCIIACK_BASE, 169a427ceefSDeepak Saxena .pfn = __phys_to_pfn(DC21285_PCI_IACK), 170a427ceefSDeepak Saxena .length = PCIIACK_SIZE, 1716460177fSRussell King .type = MT_DEVICE, 1726460177fSRussell King }, 1731da177e4SLinus Torvalds #endif 1741da177e4SLinus Torvalds }; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds void __init footbridge_map_io(void) 1771da177e4SLinus Torvalds { 1781da177e4SLinus Torvalds /* 1791da177e4SLinus Torvalds * Set up the common mapping first; we need this to 1801da177e4SLinus Torvalds * determine whether we're in host mode or not. 1811da177e4SLinus Torvalds */ 1821da177e4SLinus Torvalds iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc)); 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds /* 1851da177e4SLinus Torvalds * Now, work out what we've got to map in addition on this 1861da177e4SLinus Torvalds * platform. 1871da177e4SLinus Torvalds */ 1888ef6e620SRob Herring if (footbridge_cfn_mode()) { 1891da177e4SLinus Torvalds iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc)); 1908ef6e620SRob Herring pci_map_io_early(__phys_to_pfn(DC21285_PCI_IO)); 1918ef6e620SRob Herring } 19243659222SRussell King 19343659222SRussell King vga_base = PCIMEM_BASE; 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1967b6d864bSRobin Holt void footbridge_restart(enum reboot_mode mode, const char *cmd) 1976fca1e17SRussell King { 1987b6d864bSRobin Holt if (mode == REBOOT_SOFT) { 1996fca1e17SRussell King /* Jump into the ROM */ 2006fca1e17SRussell King soft_restart(0x41000000); 2016fca1e17SRussell King } else { 2026fca1e17SRussell King /* 2036fca1e17SRussell King * Force the watchdog to do a CPU reset. 2046fca1e17SRussell King * 2056fca1e17SRussell King * After making sure that the watchdog is disabled 2066fca1e17SRussell King * (so we can change the timer registers) we first 2076fca1e17SRussell King * enable the timer to autoreload itself. Next, the 2086fca1e17SRussell King * timer interval is set really short and any 2096fca1e17SRussell King * current interrupt request is cleared (so we can 2106fca1e17SRussell King * see an edge transition). Finally, TIMER4 is 2116fca1e17SRussell King * enabled as the watchdog. 2126fca1e17SRussell King */ 2136fca1e17SRussell King *CSR_SA110_CNTL &= ~(1 << 13); 2146fca1e17SRussell King *CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE | 2156fca1e17SRussell King TIMER_CNTL_AUTORELOAD | 2166fca1e17SRussell King TIMER_CNTL_DIV16; 2176fca1e17SRussell King *CSR_TIMER4_LOAD = 0x2; 2186fca1e17SRussell King *CSR_TIMER4_CLR = 0; 2196fca1e17SRussell King *CSR_SA110_CNTL |= (1 << 13); 2206fca1e17SRussell King } 2216fca1e17SRussell King } 2226fca1e17SRussell King 2231da177e4SLinus Torvalds #ifdef CONFIG_FOOTBRIDGE_ADDIN 2241da177e4SLinus Torvalds 225c7baab5dSRussell King static inline unsigned long fb_bus_sdram_offset(void) 226c7baab5dSRussell King { 227c7baab5dSRussell King return *CSR_PCISDRAMBASE & 0xfffffff0; 228c7baab5dSRussell King } 229c7baab5dSRussell King 2301da177e4SLinus Torvalds /* 2311da177e4SLinus Torvalds * These two functions convert virtual addresses to PCI addresses and PCI 2321da177e4SLinus Torvalds * addresses to virtual addresses. Note that it is only legal to use these 2331da177e4SLinus Torvalds * on memory obtained via get_zeroed_page or kmalloc. 2341da177e4SLinus Torvalds */ 2351da177e4SLinus Torvalds unsigned long __virt_to_bus(unsigned long res) 2361da177e4SLinus Torvalds { 2371da177e4SLinus Torvalds WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 2381da177e4SLinus Torvalds 239c7baab5dSRussell King return res + (fb_bus_sdram_offset() - PAGE_OFFSET); 2401da177e4SLinus Torvalds } 2411da177e4SLinus Torvalds EXPORT_SYMBOL(__virt_to_bus); 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds unsigned long __bus_to_virt(unsigned long res) 2441da177e4SLinus Torvalds { 245c7baab5dSRussell King res = res - (fb_bus_sdram_offset() - PAGE_OFFSET); 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds return res; 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds EXPORT_SYMBOL(__bus_to_virt); 2521da177e4SLinus Torvalds 253c7baab5dSRussell King unsigned long __pfn_to_bus(unsigned long pfn) 254c7baab5dSRussell King { 25564dd3b74Swanzongshun return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET); 256c7baab5dSRussell King } 257c7baab5dSRussell King EXPORT_SYMBOL(__pfn_to_bus); 258c7baab5dSRussell King 259c7baab5dSRussell King unsigned long __bus_to_pfn(unsigned long bus) 260c7baab5dSRussell King { 261c7baab5dSRussell King return __phys_to_pfn(bus - (fb_bus_sdram_offset() - PHYS_OFFSET)); 262c7baab5dSRussell King } 263c7baab5dSRussell King EXPORT_SYMBOL(__bus_to_pfn); 264c7baab5dSRussell King 2651da177e4SLinus Torvalds #endif 266