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264 lines
6.2 KiB
264 lines
6.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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#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 <video/vga.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 <asm/mach/pci.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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irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); |
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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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}; |
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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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#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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pci_map_io_early(__phys_to_pfn(DC21285_PCI_IO)); |
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} |
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vga_base = PCIMEM_BASE; |
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} |
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void footbridge_restart(enum reboot_mode mode, const char *cmd) |
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{ |
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if (mode == REBOOT_SOFT) { |
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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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