diff options
Diffstat (limited to 'arch/alpha/kernel/sys_eiger.c')
| -rw-r--r-- | arch/alpha/kernel/sys_eiger.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/arch/alpha/kernel/sys_eiger.c b/arch/alpha/kernel/sys_eiger.c new file mode 100644 index 00000000000..bd6e5f0e43c --- /dev/null +++ b/arch/alpha/kernel/sys_eiger.c @@ -0,0 +1,242 @@ +/* + * linux/arch/alpha/kernel/sys_eiger.c + * + * Copyright (C) 1995 David A Rusling + * Copyright (C) 1996, 1999 Jay A Estabrook + * Copyright (C) 1998, 1999 Richard Henderson + * Copyright (C) 1999 Iain Grant + * + * Code supporting the EIGER (EV6+TSUNAMI). + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/pci.h> +#include <linux/init.h> +#include <linux/bitops.h> + +#include <asm/ptrace.h> +#include <asm/system.h> +#include <asm/dma.h> +#include <asm/irq.h> +#include <asm/mmu_context.h> +#include <asm/io.h> +#include <asm/pci.h> +#include <asm/pgtable.h> +#include <asm/core_tsunami.h> +#include <asm/hwrpb.h> +#include <asm/tlbflush.h> + +#include "proto.h" +#include "irq_impl.h" +#include "pci_impl.h" +#include "machvec_impl.h" + + +/* Note that this interrupt code is identical to TAKARA. */ + +/* Note mask bit is true for DISABLED irqs. */ +static unsigned long cached_irq_mask[2] = { -1, -1 }; + +static inline void +eiger_update_irq_hw(unsigned long irq, unsigned long mask) +{ + int regaddr; + + mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30)); + regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c); + outl(mask & 0xffff0000UL, regaddr); +} + +static inline void +eiger_enable_irq(unsigned int irq) +{ + unsigned long mask; + mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63))); + eiger_update_irq_hw(irq, mask); +} + +static void +eiger_disable_irq(unsigned int irq) +{ + unsigned long mask; + mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63)); + eiger_update_irq_hw(irq, mask); +} + +static unsigned int +eiger_startup_irq(unsigned int irq) +{ + eiger_enable_irq(irq); + return 0; /* never anything pending */ +} + +static void +eiger_end_irq(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) + eiger_enable_irq(irq); +} + +static struct hw_interrupt_type eiger_irq_type = { + .typename = "EIGER", + .startup = eiger_startup_irq, + .shutdown = eiger_disable_irq, + .enable = eiger_enable_irq, + .disable = eiger_disable_irq, + .ack = eiger_disable_irq, + .end = eiger_end_irq, +}; + +static void +eiger_device_interrupt(unsigned long vector, struct pt_regs * regs) +{ + unsigned intstatus; + + /* + * The PALcode will have passed us vectors 0x800 or 0x810, + * which are fairly arbitrary values and serve only to tell + * us whether an interrupt has come in on IRQ0 or IRQ1. If + * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's + * probably ISA, but PCI interrupts can come through IRQ0 + * as well if the interrupt controller isn't in accelerated + * mode. + * + * OTOH, the accelerator thing doesn't seem to be working + * overly well, so what we'll do instead is try directly + * examining the Master Interrupt Register to see if it's a + * PCI interrupt, and if _not_ then we'll pass it on to the + * ISA handler. + */ + + intstatus = inw(0x500) & 15; + if (intstatus) { + /* + * This is a PCI interrupt. Check each bit and + * despatch an interrupt if it's set. + */ + + if (intstatus & 8) handle_irq(16+3, regs); + if (intstatus & 4) handle_irq(16+2, regs); + if (intstatus & 2) handle_irq(16+1, regs); + if (intstatus & 1) handle_irq(16+0, regs); + } else { + isa_device_interrupt(vector, regs); + } +} + +static void +eiger_srm_device_interrupt(unsigned long vector, struct pt_regs * regs) +{ + int irq = (vector - 0x800) >> 4; + handle_irq(irq, regs); +} + +static void __init +eiger_init_irq(void) +{ + long i; + + outb(0, DMA1_RESET_REG); + outb(0, DMA2_RESET_REG); + outb(DMA_MODE_CASCADE, DMA2_MODE_REG); + outb(0, DMA2_MASK_REG); + + if (alpha_using_srm) + alpha_mv.device_interrupt = eiger_srm_device_interrupt; + + for (i = 16; i < 128; i += 16) + eiger_update_irq_hw(i, -1); + + init_i8259a_irqs(); + + for (i = 16; i < 128; ++i) { + irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL; + irq_desc[i].handler = &eiger_irq_type; + } +} + +static int __init +eiger_map_irq(struct pci_dev *dev, u8 slot, u8 pin) +{ + u8 irq_orig; + + /* The SRM console has already calculated out the IRQ value's for + option cards. As this works lets just read in the value already + set and change it to a useable value by Linux. + + All the IRQ values generated by the console are greater than 90, + so we subtract 80 because it is (90 - allocated ISA IRQ's). */ + + pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq_orig); + + return irq_orig - 0x80; +} + +static u8 __init +eiger_swizzle(struct pci_dev *dev, u8 *pinp) +{ + struct pci_controller *hose = dev->sysdata; + int slot, pin = *pinp; + int bridge_count = 0; + + /* Find the number of backplane bridges. */ + int backplane = inw(0x502) & 0x0f; + + switch (backplane) + { + case 0x00: bridge_count = 0; break; /* No bridges */ + case 0x01: bridge_count = 1; break; /* 1 */ + case 0x03: bridge_count = 2; break; /* 2 */ + case 0x07: bridge_count = 3; break; /* 3 */ + case 0x0f: bridge_count = 4; break; /* 4 */ + }; + + slot = PCI_SLOT(dev->devfn); + while (dev->bus->self) { + /* Check for built-in bridges on hose 0. */ + if (hose->index == 0 + && (PCI_SLOT(dev->bus->self->devfn) + > 20 - bridge_count)) { + slot = PCI_SLOT(dev->devfn); + break; + } + /* Must be a card-based bridge. */ + pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn)); + + /* Move up the chain of bridges. */ + dev = dev->bus->self; + } + *pinp = pin; + return slot; +} + +/* + * The System Vectors + */ + +struct alpha_machine_vector eiger_mv __initmv = { + .vector_name = "Eiger", + DO_EV6_MMU, + DO_DEFAULT_RTC, + DO_TSUNAMI_IO, + .machine_check = tsunami_machine_check, + .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, + .min_io_address = DEFAULT_IO_BASE, + .min_mem_address = DEFAULT_MEM_BASE, + .pci_dac_offset = TSUNAMI_DAC_OFFSET, + + .nr_irqs = 128, + .device_interrupt = eiger_device_interrupt, + + .init_arch = tsunami_init_arch, + .init_irq = eiger_init_irq, + .init_rtc = common_init_rtc, + .init_pci = common_init_pci, + .kill_arch = tsunami_kill_arch, + .pci_map_irq = eiger_map_irq, + .pci_swizzle = eiger_swizzle, +}; +ALIAS_MV(eiger) |