273 lines
6.4 KiB
C
273 lines
6.4 KiB
C
/*
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* linux/arch/arm/mach-footbridge/common.c
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*
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* Copyright (C) 1998-2000 Russell King, Dave Gilbert.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/irq.h>
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#include <asm/mach-types.h>
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#include <asm/setup.h>
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#include <asm/system_misc.h>
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#include <asm/hardware/dec21285.h>
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#include <asm/mach/irq.h>
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#include <asm/mach/map.h>
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#include "common.h"
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unsigned int mem_fclk_21285 = 50000000;
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EXPORT_SYMBOL(mem_fclk_21285);
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static int __init early_fclk(char *arg)
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{
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mem_fclk_21285 = simple_strtoul(arg, NULL, 0);
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return 0;
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}
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early_param("mem_fclk_21285", early_fclk);
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static int __init parse_tag_memclk(const struct tag *tag)
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{
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mem_fclk_21285 = tag->u.memclk.fmemclk;
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return 0;
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}
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__tagtable(ATAG_MEMCLK, parse_tag_memclk);
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/*
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* Footbridge IRQ translation table
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* Converts from our IRQ numbers into FootBridge masks
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*/
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static const int fb_irq_mask[] = {
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IRQ_MASK_UART_RX, /* 0 */
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IRQ_MASK_UART_TX, /* 1 */
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IRQ_MASK_TIMER1, /* 2 */
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IRQ_MASK_TIMER2, /* 3 */
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IRQ_MASK_TIMER3, /* 4 */
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IRQ_MASK_IN0, /* 5 */
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IRQ_MASK_IN1, /* 6 */
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IRQ_MASK_IN2, /* 7 */
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IRQ_MASK_IN3, /* 8 */
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IRQ_MASK_DOORBELLHOST, /* 9 */
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IRQ_MASK_DMA1, /* 10 */
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IRQ_MASK_DMA2, /* 11 */
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IRQ_MASK_PCI, /* 12 */
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IRQ_MASK_SDRAMPARITY, /* 13 */
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IRQ_MASK_I2OINPOST, /* 14 */
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IRQ_MASK_PCI_ABORT, /* 15 */
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IRQ_MASK_PCI_SERR, /* 16 */
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IRQ_MASK_DISCARD_TIMER, /* 17 */
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IRQ_MASK_PCI_DPERR, /* 18 */
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IRQ_MASK_PCI_PERR, /* 19 */
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};
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static void fb_mask_irq(struct irq_data *d)
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{
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*CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(d->irq)];
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}
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static void fb_unmask_irq(struct irq_data *d)
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{
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*CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(d->irq)];
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}
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static struct irq_chip fb_chip = {
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.irq_ack = fb_mask_irq,
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.irq_mask = fb_mask_irq,
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.irq_unmask = fb_unmask_irq,
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};
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static void __init __fb_init_irq(void)
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{
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unsigned int irq;
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/*
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* setup DC21285 IRQs
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*/
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*CSR_IRQ_DISABLE = -1;
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*CSR_FIQ_DISABLE = -1;
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for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
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irq_set_chip_and_handler(irq, &fb_chip, handle_level_irq);
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set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
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}
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}
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void __init footbridge_init_irq(void)
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{
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__fb_init_irq();
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if (!footbridge_cfn_mode())
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return;
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if (machine_is_ebsa285())
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/* The following is dependent on which slot
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* you plug the Southbridge card into. We
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* currently assume that you plug it into
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* the right-hand most slot.
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*/
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isa_init_irq(IRQ_PCI);
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if (machine_is_cats())
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isa_init_irq(IRQ_IN2);
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if (machine_is_netwinder())
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isa_init_irq(IRQ_IN3);
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}
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/*
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* Common mapping for all systems. Note that the outbound write flush is
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* commented out since there is a "No Fix" problem with it. Not mapping
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* it means that we have extra bullet protection on our feet.
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*/
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static struct map_desc fb_common_io_desc[] __initdata = {
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{
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.virtual = ARMCSR_BASE,
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.pfn = __phys_to_pfn(DC21285_ARMCSR_BASE),
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.length = ARMCSR_SIZE,
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.type = MT_DEVICE,
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}, {
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.virtual = XBUS_BASE,
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.pfn = __phys_to_pfn(0x40000000),
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.length = XBUS_SIZE,
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.type = MT_DEVICE,
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}
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};
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/*
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* The mapping when the footbridge is in host mode. We don't map any of
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* this when we are in add-in mode.
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*/
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static struct map_desc ebsa285_host_io_desc[] __initdata = {
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#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
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{
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.virtual = PCIMEM_BASE,
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.pfn = __phys_to_pfn(DC21285_PCI_MEM),
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.length = PCIMEM_SIZE,
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.type = MT_DEVICE,
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}, {
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.virtual = PCICFG0_BASE,
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.pfn = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG),
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.length = PCICFG0_SIZE,
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.type = MT_DEVICE,
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}, {
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.virtual = PCICFG1_BASE,
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.pfn = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG),
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.length = PCICFG1_SIZE,
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.type = MT_DEVICE,
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}, {
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.virtual = PCIIACK_BASE,
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.pfn = __phys_to_pfn(DC21285_PCI_IACK),
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.length = PCIIACK_SIZE,
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.type = MT_DEVICE,
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}, {
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.virtual = PCIO_BASE,
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.pfn = __phys_to_pfn(DC21285_PCI_IO),
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.length = PCIO_SIZE,
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.type = MT_DEVICE,
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},
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#endif
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};
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void __init footbridge_map_io(void)
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{
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/*
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* Set up the common mapping first; we need this to
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* determine whether we're in host mode or not.
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*/
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iotable_init(fb_common_io_desc, ARRAY_SIZE(fb_common_io_desc));
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/*
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* Now, work out what we've got to map in addition on this
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* platform.
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*/
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if (footbridge_cfn_mode())
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iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
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}
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void footbridge_restart(char mode, const char *cmd)
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{
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if (mode == 's') {
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/* Jump into the ROM */
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soft_restart(0x41000000);
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} else {
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/*
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* Force the watchdog to do a CPU reset.
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*
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* After making sure that the watchdog is disabled
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* (so we can change the timer registers) we first
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* enable the timer to autoreload itself. Next, the
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* timer interval is set really short and any
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* current interrupt request is cleared (so we can
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* see an edge transition). Finally, TIMER4 is
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* enabled as the watchdog.
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*/
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*CSR_SA110_CNTL &= ~(1 << 13);
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*CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE |
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TIMER_CNTL_AUTORELOAD |
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TIMER_CNTL_DIV16;
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*CSR_TIMER4_LOAD = 0x2;
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*CSR_TIMER4_CLR = 0;
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*CSR_SA110_CNTL |= (1 << 13);
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}
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}
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#ifdef CONFIG_FOOTBRIDGE_ADDIN
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static inline unsigned long fb_bus_sdram_offset(void)
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{
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return *CSR_PCISDRAMBASE & 0xfffffff0;
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}
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/*
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* These two functions convert virtual addresses to PCI addresses and PCI
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* addresses to virtual addresses. Note that it is only legal to use these
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* on memory obtained via get_zeroed_page or kmalloc.
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*/
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unsigned long __virt_to_bus(unsigned long res)
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{
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WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
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return res + (fb_bus_sdram_offset() - PAGE_OFFSET);
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}
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EXPORT_SYMBOL(__virt_to_bus);
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unsigned long __bus_to_virt(unsigned long res)
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{
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res = res - (fb_bus_sdram_offset() - PAGE_OFFSET);
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WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
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return res;
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}
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EXPORT_SYMBOL(__bus_to_virt);
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unsigned long __pfn_to_bus(unsigned long pfn)
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{
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return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET);
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}
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EXPORT_SYMBOL(__pfn_to_bus);
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unsigned long __bus_to_pfn(unsigned long bus)
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{
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return __phys_to_pfn(bus - (fb_bus_sdram_offset() - PHYS_OFFSET));
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}
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EXPORT_SYMBOL(__bus_to_pfn);
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#endif
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