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Diffstat (limited to 'arch/arm/mach-footbridge/common.c')
| -rw-r--r-- | arch/arm/mach-footbridge/common.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/arch/arm/mach-footbridge/common.c b/arch/arm/mach-footbridge/common.c new file mode 100644 index 0000000..eb8238c --- /dev/null +++ b/arch/arm/mach-footbridge/common.c @@ -0,0 +1,205 @@ +/* + * linux/arch/arm/mach-footbridge/common.c + * + * Copyright (C) 1998-2000 Russell King, Dave Gilbert. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/config.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/ioport.h> +#include <linux/list.h> +#include <linux/init.h> + +#include <asm/pgtable.h> +#include <asm/page.h> +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/mach-types.h> +#include <asm/setup.h> +#include <asm/hardware/dec21285.h> + +#include <asm/mach/irq.h> +#include <asm/mach/map.h> + +#include "common.h" + +extern void __init isa_init_irq(unsigned int irq); + +unsigned int mem_fclk_21285 = 50000000; + +EXPORT_SYMBOL(mem_fclk_21285); + +static int __init parse_tag_memclk(const struct tag *tag) +{ + mem_fclk_21285 = tag->u.memclk.fmemclk; + return 0; +} + +__tagtable(ATAG_MEMCLK, parse_tag_memclk); + +/* + * Footbridge IRQ translation table + * Converts from our IRQ numbers into FootBridge masks + */ +static const int fb_irq_mask[] = { + IRQ_MASK_UART_RX, /* 0 */ + IRQ_MASK_UART_TX, /* 1 */ + IRQ_MASK_TIMER1, /* 2 */ + IRQ_MASK_TIMER2, /* 3 */ + IRQ_MASK_TIMER3, /* 4 */ + IRQ_MASK_IN0, /* 5 */ + IRQ_MASK_IN1, /* 6 */ + IRQ_MASK_IN2, /* 7 */ + IRQ_MASK_IN3, /* 8 */ + IRQ_MASK_DOORBELLHOST, /* 9 */ + IRQ_MASK_DMA1, /* 10 */ + IRQ_MASK_DMA2, /* 11 */ + IRQ_MASK_PCI, /* 12 */ + IRQ_MASK_SDRAMPARITY, /* 13 */ + IRQ_MASK_I2OINPOST, /* 14 */ + IRQ_MASK_PCI_ABORT, /* 15 */ + IRQ_MASK_PCI_SERR, /* 16 */ + IRQ_MASK_DISCARD_TIMER, /* 17 */ + IRQ_MASK_PCI_DPERR, /* 18 */ + IRQ_MASK_PCI_PERR, /* 19 */ +}; + +static void fb_mask_irq(unsigned int irq) +{ + *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)]; +} + +static void fb_unmask_irq(unsigned int irq) +{ + *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)]; +} + +static struct irqchip fb_chip = { + .ack = fb_mask_irq, + .mask = fb_mask_irq, + .unmask = fb_unmask_irq, +}; + +static void __init __fb_init_irq(void) +{ + unsigned int irq; + + /* + * setup DC21285 IRQs + */ + *CSR_IRQ_DISABLE = -1; + *CSR_FIQ_DISABLE = -1; + + for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) { + set_irq_chip(irq, &fb_chip); + set_irq_handler(irq, do_level_IRQ); + set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); + } +} + +void __init footbridge_init_irq(void) +{ + __fb_init_irq(); + + if (!footbridge_cfn_mode()) + return; + + if (machine_is_ebsa285()) + /* The following is dependent on which slot + * you plug the Southbridge card into. We + * currently assume that you plug it into + * the right-hand most slot. + */ + isa_init_irq(IRQ_PCI); + + if (machine_is_cats()) + isa_init_irq(IRQ_IN2); + + if (machine_is_netwinder()) + isa_init_irq(IRQ_IN3); +} + +/* + * Common mapping for all systems. Note that the outbound write flush is + * commented out since there is a "No Fix" problem with it. Not mapping + * it means that we have extra bullet protection on our feet. + */ +static struct map_desc fb_common_io_desc[] __initdata = { + { ARMCSR_BASE, DC21285_ARMCSR_BASE, ARMCSR_SIZE, MT_DEVICE }, + { XBUS_BASE, 0x40000000, XBUS_SIZE, MT_DEVICE } +}; + +/* + * The mapping when the footbridge is in host mode. We don't map any of + * this when we are in add-in mode. + */ +static struct map_desc ebsa285_host_io_desc[] __initdata = { +#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST) + { PCIMEM_BASE, DC21285_PCI_MEM, PCIMEM_SIZE, MT_DEVICE }, + { PCICFG0_BASE, DC21285_PCI_TYPE_0_CONFIG, PCICFG0_SIZE, MT_DEVICE }, + { PCICFG1_BASE, DC21285_PCI_TYPE_1_CONFIG, PCICFG1_SIZE, MT_DEVICE }, + { PCIIACK_BASE, DC21285_PCI_IACK, PCIIACK_SIZE, MT_DEVICE }, + { PCIO_BASE, DC21285_PCI_IO, PCIO_SIZE, MT_DEVICE } +#endif +}; + +/* + * The CO-ebsa285 mapping. + */ +static struct map_desc co285_io_desc[] __initdata = { +#ifdef CONFIG_ARCH_CO285 + { PCIO_BASE, DC21285_PCI_IO, PCIO_SIZE, MT_DEVICE }, + { PCIMEM_BASE, DC21285_PCI_MEM, PCIMEM_SIZE, MT_DEVICE } +#endif +}; + +void __init footbridge_map_io(void) +{ + /* + * Set up the common mapping first; we need this to + * determine whether we're in host mode or not. + */ + iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc)); + + /* + * Now, work out what we've got to map in addition on this + * platform. + */ + if (machine_is_co285()) + iotable_init(co285_io_desc, ARRAY_SIZE(co285_io_desc)); + if (footbridge_cfn_mode()) + iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc)); +} + +#ifdef CONFIG_FOOTBRIDGE_ADDIN + +/* + * These two functions convert virtual addresses to PCI addresses and PCI + * addresses to virtual addresses. Note that it is only legal to use these + * on memory obtained via get_zeroed_page or kmalloc. + */ +unsigned long __virt_to_bus(unsigned long res) +{ + WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); + + return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0); +} +EXPORT_SYMBOL(__virt_to_bus); + +unsigned long __bus_to_virt(unsigned long res) +{ + res -= (*CSR_PCISDRAMBASE & 0xfffffff0); + res += PAGE_OFFSET; + + WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory); + + return res; +} +EXPORT_SYMBOL(__bus_to_virt); + +#endif |