sys_noritake.c
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上传日期:2013-02-24
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- /*
- * linux/arch/alpha/kernel/sys_noritake.c
- *
- * Copyright (C) 1995 David A Rusling
- * Copyright (C) 1996 Jay A Estabrook
- * Copyright (C) 1998, 1999 Richard Henderson
- *
- * Code supporting the NORITAKE (AlphaServer 1000A),
- * CORELLE (AlphaServer 800), and ALCOR Primo (AlphaStation 600A).
- */
- #include <linux/config.h>
- #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 <asm/ptrace.h>
- #include <asm/system.h>
- #include <asm/dma.h>
- #include <asm/irq.h>
- #include <asm/bitops.h>
- #include <asm/mmu_context.h>
- #include <asm/io.h>
- #include <asm/pgtable.h>
- #include <asm/core_apecs.h>
- #include <asm/core_cia.h>
- #include "proto.h"
- #include "irq_impl.h"
- #include "pci_impl.h"
- #include "machvec_impl.h"
- /* Note mask bit is true for ENABLED irqs. */
- static int cached_irq_mask;
- static inline void
- noritake_update_irq_hw(int irq, int mask)
- {
- int port = 0x54a;
- if (irq >= 32) {
- mask >>= 16;
- port = 0x54c;
- }
- outw(mask, port);
- }
- static void
- noritake_enable_irq(unsigned int irq)
- {
- noritake_update_irq_hw(irq, cached_irq_mask |= 1 << (irq - 16));
- }
- static void
- noritake_disable_irq(unsigned int irq)
- {
- noritake_update_irq_hw(irq, cached_irq_mask &= ~(1 << (irq - 16)));
- }
- static unsigned int
- noritake_startup_irq(unsigned int irq)
- {
- noritake_enable_irq(irq);
- return 0;
- }
- static struct hw_interrupt_type noritake_irq_type = {
- typename: "NORITAKE",
- startup: noritake_startup_irq,
- shutdown: noritake_disable_irq,
- enable: noritake_enable_irq,
- disable: noritake_disable_irq,
- ack: noritake_disable_irq,
- end: noritake_enable_irq,
- };
- static void
- noritake_device_interrupt(unsigned long vector, struct pt_regs *regs)
- {
- unsigned long pld;
- unsigned int i;
- /* Read the interrupt summary registers of NORITAKE */
- pld = (((unsigned long) inw(0x54c) << 32)
- | ((unsigned long) inw(0x54a) << 16)
- | ((unsigned long) inb(0xa0) << 8)
- | inb(0x20));
- /*
- * Now for every possible bit set, work through them and call
- * the appropriate interrupt handler.
- */
- while (pld) {
- i = ffz(~pld);
- pld &= pld - 1; /* clear least bit set */
- if (i < 16) {
- isa_device_interrupt(vector, regs);
- } else {
- handle_irq(i, regs);
- }
- }
- }
- static void
- noritake_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
- {
- int irq;
- irq = (vector - 0x800) >> 4;
- /*
- * I really hate to do this, too, but the NORITAKE SRM console also
- * reports PCI vectors *lower* than I expected from the bit numbers
- * in the documentation.
- * But I really don't want to change the fixup code for allocation
- * of IRQs, nor the alpha_irq_mask maintenance stuff, both of which
- * look nice and clean now.
- * So, here's this additional grotty hack... :-(
- */
- if (irq >= 16)
- irq = irq + 1;
- handle_irq(irq, regs);
- }
- static void __init
- noritake_init_irq(void)
- {
- long i;
- if (alpha_using_srm)
- alpha_mv.device_interrupt = noritake_srm_device_interrupt;
- outw(0, 0x54a);
- outw(0, 0x54c);
- for (i = 16; i < 48; ++i) {
- irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
- irq_desc[i].handler = &noritake_irq_type;
- }
- init_i8259a_irqs();
- common_init_isa_dma();
- }
- /*
- * PCI Fixup configuration.
- *
- * Summary @ 0x542, summary register #1:
- * Bit Meaning
- * 0 All valid ints from summary regs 2 & 3
- * 1 QLOGIC ISP1020A SCSI
- * 2 Interrupt Line A from slot 0
- * 3 Interrupt Line B from slot 0
- * 4 Interrupt Line A from slot 1
- * 5 Interrupt line B from slot 1
- * 6 Interrupt Line A from slot 2
- * 7 Interrupt Line B from slot 2
- * 8 Interrupt Line A from slot 3
- * 9 Interrupt Line B from slot 3
- *10 Interrupt Line A from slot 4
- *11 Interrupt Line B from slot 4
- *12 Interrupt Line A from slot 5
- *13 Interrupt Line B from slot 5
- *14 Interrupt Line A from slot 6
- *15 Interrupt Line B from slot 6
- *
- * Summary @ 0x544, summary register #2:
- * Bit Meaning
- * 0 OR of all unmasked ints in SR #2
- * 1 OR of secondary bus ints
- * 2 Interrupt Line C from slot 0
- * 3 Interrupt Line D from slot 0
- * 4 Interrupt Line C from slot 1
- * 5 Interrupt line D from slot 1
- * 6 Interrupt Line C from slot 2
- * 7 Interrupt Line D from slot 2
- * 8 Interrupt Line C from slot 3
- * 9 Interrupt Line D from slot 3
- *10 Interrupt Line C from slot 4
- *11 Interrupt Line D from slot 4
- *12 Interrupt Line C from slot 5
- *13 Interrupt Line D from slot 5
- *14 Interrupt Line C from slot 6
- *15 Interrupt Line D from slot 6
- *
- * The device to slot mapping looks like:
- *
- * Slot Device
- * 7 Intel PCI-EISA bridge chip
- * 8 DEC PCI-PCI bridge chip
- * 11 PCI on board slot 0
- * 12 PCI on board slot 1
- * 13 PCI on board slot 2
- *
- *
- * This two layered interrupt approach means that we allocate IRQ 16 and
- * above for PCI interrupts. The IRQ relates to which bit the interrupt
- * comes in on. This makes interrupt processing much easier.
- */
- static int __init
- noritake_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- static char irq_tab[15][5] __initdata = {
- /*INT INTA INTB INTC INTD */
- /* note: IDSELs 16, 17, and 25 are CORELLE only */
- { 16+1, 16+1, 16+1, 16+1, 16+1}, /* IdSel 16, QLOGIC */
- { -1, -1, -1, -1, -1}, /* IdSel 17, S3 Trio64 */
- { -1, -1, -1, -1, -1}, /* IdSel 18, PCEB */
- { -1, -1, -1, -1, -1}, /* IdSel 19, PPB */
- { -1, -1, -1, -1, -1}, /* IdSel 20, ???? */
- { -1, -1, -1, -1, -1}, /* IdSel 21, ???? */
- { 16+2, 16+2, 16+3, 32+2, 32+3}, /* IdSel 22, slot 0 */
- { 16+4, 16+4, 16+5, 32+4, 32+5}, /* IdSel 23, slot 1 */
- { 16+6, 16+6, 16+7, 32+6, 32+7}, /* IdSel 24, slot 2 */
- { 16+8, 16+8, 16+9, 32+8, 32+9}, /* IdSel 25, slot 3 */
- /* The following 5 are actually on PCI bus 1, which is
- across the built-in bridge of the NORITAKE only. */
- { 16+1, 16+1, 16+1, 16+1, 16+1}, /* IdSel 16, QLOGIC */
- { 16+8, 16+8, 16+9, 32+8, 32+9}, /* IdSel 17, slot 3 */
- {16+10, 16+10, 16+11, 32+10, 32+11}, /* IdSel 18, slot 4 */
- {16+12, 16+12, 16+13, 32+12, 32+13}, /* IdSel 19, slot 5 */
- {16+14, 16+14, 16+15, 32+14, 32+15}, /* IdSel 20, slot 6 */
- };
- const long min_idsel = 5, max_idsel = 19, irqs_per_slot = 5;
- return COMMON_TABLE_LOOKUP;
- }
- static u8 __init
- noritake_swizzle(struct pci_dev *dev, u8 *pinp)
- {
- int slot, pin = *pinp;
- if (dev->bus->number == 0) {
- slot = PCI_SLOT(dev->devfn);
- }
- /* Check for the built-in bridge */
- else if (PCI_SLOT(dev->bus->self->devfn) == 8) {
- slot = PCI_SLOT(dev->devfn) + 15; /* WAG! */
- }
- else
- {
- /* Must be a card-based bridge. */
- do {
- if (PCI_SLOT(dev->bus->self->devfn) == 8) {
- slot = PCI_SLOT(dev->devfn) + 15;
- break;
- }
- pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn)) ;
- /* Move up the chain of bridges. */
- dev = dev->bus->self;
- /* Slot of the next bridge. */
- slot = PCI_SLOT(dev->devfn);
- } while (dev->bus->self);
- }
- *pinp = pin;
- return slot;
- }
- #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
- static void
- noritake_apecs_machine_check(unsigned long vector, unsigned long la_ptr,
- struct pt_regs * regs)
- {
- #define MCHK_NO_DEVSEL 0x205U
- #define MCHK_NO_TABT 0x204U
- struct el_common *mchk_header;
- unsigned int code;
- mchk_header = (struct el_common *)la_ptr;
- /* Clear the error before any reporting. */
- mb();
- mb(); /* magic */
- draina();
- apecs_pci_clr_err();
- wrmces(0x7);
- mb();
- code = mchk_header->code;
- process_mcheck_info(vector, la_ptr, regs, "NORITAKE APECS",
- (mcheck_expected(0)
- && (code == MCHK_NO_DEVSEL
- || code == MCHK_NO_TABT)));
- }
- #endif
- /*
- * The System Vectors
- */
- #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
- struct alpha_machine_vector noritake_mv __initmv = {
- vector_name: "Noritake",
- DO_EV4_MMU,
- DO_DEFAULT_RTC,
- DO_APECS_IO,
- DO_APECS_BUS,
- machine_check: noritake_apecs_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: EISA_DEFAULT_IO_BASE,
- min_mem_address: APECS_AND_LCA_DEFAULT_MEM_BASE,
- nr_irqs: 48,
- device_interrupt: noritake_device_interrupt,
- init_arch: apecs_init_arch,
- init_irq: noritake_init_irq,
- init_rtc: common_init_rtc,
- init_pci: common_init_pci,
- kill_arch: NULL,
- pci_map_irq: noritake_map_irq,
- pci_swizzle: noritake_swizzle,
- };
- ALIAS_MV(noritake)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PRIMO)
- struct alpha_machine_vector noritake_primo_mv __initmv = {
- vector_name: "Noritake-Primo",
- DO_EV5_MMU,
- DO_DEFAULT_RTC,
- DO_CIA_IO,
- DO_CIA_BUS,
- machine_check: cia_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: EISA_DEFAULT_IO_BASE,
- min_mem_address: CIA_DEFAULT_MEM_BASE,
- nr_irqs: 48,
- device_interrupt: noritake_device_interrupt,
- init_arch: cia_init_arch,
- init_irq: noritake_init_irq,
- init_rtc: common_init_rtc,
- init_pci: cia_init_pci,
- pci_map_irq: noritake_map_irq,
- pci_swizzle: noritake_swizzle,
- };
- ALIAS_MV(noritake_primo)
- #endif