sys_mikasa.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:6k
- /*
- * linux/arch/alpha/kernel/sys_mikasa.c
- *
- * Copyright (C) 1995 David A Rusling
- * Copyright (C) 1996 Jay A Estabrook
- * Copyright (C) 1998, 1999 Richard Henderson
- *
- * Code supporting the MIKASA (AlphaServer 1000).
- */
- #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
- mikasa_update_irq_hw(int mask)
- {
- outw(mask, 0x536);
- }
- static inline void
- mikasa_enable_irq(unsigned int irq)
- {
- mikasa_update_irq_hw(cached_irq_mask |= 1 << (irq - 16));
- }
- static void
- mikasa_disable_irq(unsigned int irq)
- {
- mikasa_update_irq_hw(cached_irq_mask &= ~(1 << (irq - 16)));
- }
- static unsigned int
- mikasa_startup_irq(unsigned int irq)
- {
- mikasa_enable_irq(irq);
- return 0;
- }
- static void
- mikasa_end_irq(unsigned int irq)
- {
- if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
- mikasa_enable_irq(irq);
- }
- static struct hw_interrupt_type mikasa_irq_type = {
- typename: "MIKASA",
- startup: mikasa_startup_irq,
- shutdown: mikasa_disable_irq,
- enable: mikasa_enable_irq,
- disable: mikasa_disable_irq,
- ack: mikasa_disable_irq,
- end: mikasa_end_irq,
- };
- static void
- mikasa_device_interrupt(unsigned long vector, struct pt_regs *regs)
- {
- unsigned long pld;
- unsigned int i;
- /* Read the interrupt summary registers */
- pld = (((~inw(0x534) & 0x0000ffffUL) << 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 __init
- mikasa_init_irq(void)
- {
- long i;
- if (alpha_using_srm)
- alpha_mv.device_interrupt = srm_device_interrupt;
- mikasa_update_irq_hw(0);
- for (i = 16; i < 32; ++i) {
- irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
- irq_desc[i].handler = &mikasa_irq_type;
- }
- init_i8259a_irqs();
- common_init_isa_dma();
- }
- /*
- * PCI Fixup configuration.
- *
- * Summary @ 0x536:
- * Bit Meaning
- * 0 Interrupt Line A from slot 0
- * 1 Interrupt Line B from slot 0
- * 2 Interrupt Line C from slot 0
- * 3 Interrupt Line D from slot 0
- * 4 Interrupt Line A from slot 1
- * 5 Interrupt line B from slot 1
- * 6 Interrupt Line C from slot 1
- * 7 Interrupt Line D from slot 1
- * 8 Interrupt Line A from slot 2
- * 9 Interrupt Line B from slot 2
- *10 Interrupt Line C from slot 2
- *11 Interrupt Line D from slot 2
- *12 NCR 810 SCSI
- *13 Power Supply Fail
- *14 Temperature Warn
- *15 Reserved
- *
- * The device to slot mapping looks like:
- *
- * Slot Device
- * 6 NCR SCSI controller
- * 7 Intel PCI-EISA 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
- mikasa_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- static char irq_tab[8][5] __initdata = {
- /*INT INTA INTB INTC INTD */
- {16+12, 16+12, 16+12, 16+12, 16+12}, /* IdSel 17, SCSI */
- { -1, -1, -1, -1, -1}, /* IdSel 18, PCEB */
- { -1, -1, -1, -1, -1}, /* IdSel 19, ???? */
- { -1, -1, -1, -1, -1}, /* IdSel 20, ???? */
- { -1, -1, -1, -1, -1}, /* IdSel 21, ???? */
- { 16+0, 16+0, 16+1, 16+2, 16+3}, /* IdSel 22, slot 0 */
- { 16+4, 16+4, 16+5, 16+6, 16+7}, /* IdSel 23, slot 1 */
- { 16+8, 16+8, 16+9, 16+10, 16+11}, /* IdSel 24, slot 2 */
- };
- const long min_idsel = 6, max_idsel = 13, irqs_per_slot = 5;
- return COMMON_TABLE_LOOKUP;
- }
- #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
- static void
- mikasa_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, "MIKASA APECS",
- (mcheck_expected(0)
- && (code == MCHK_NO_DEVSEL
- || code == MCHK_NO_TABT)));
- }
- #endif
- /*
- * The System Vector
- */
- #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
- struct alpha_machine_vector mikasa_mv __initmv = {
- vector_name: "Mikasa",
- DO_EV4_MMU,
- DO_DEFAULT_RTC,
- DO_APECS_IO,
- DO_APECS_BUS,
- machine_check: mikasa_apecs_machine_check,
- max_dma_address: ALPHA_MAX_DMA_ADDRESS,
- min_io_address: DEFAULT_IO_BASE,
- min_mem_address: APECS_AND_LCA_DEFAULT_MEM_BASE,
- nr_irqs: 32,
- device_interrupt: mikasa_device_interrupt,
- init_arch: apecs_init_arch,
- init_irq: mikasa_init_irq,
- init_rtc: common_init_rtc,
- init_pci: common_init_pci,
- kill_arch: NULL,
- pci_map_irq: mikasa_map_irq,
- pci_swizzle: common_swizzle,
- };
- ALIAS_MV(mikasa)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PRIMO)
- struct alpha_machine_vector mikasa_primo_mv __initmv = {
- vector_name: "Mikasa-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: DEFAULT_IO_BASE,
- min_mem_address: CIA_DEFAULT_MEM_BASE,
- nr_irqs: 32,
- device_interrupt: mikasa_device_interrupt,
- init_arch: cia_init_arch,
- init_irq: mikasa_init_irq,
- init_rtc: common_init_rtc,
- init_pci: cia_init_pci,
- pci_map_irq: mikasa_map_irq,
- pci_swizzle: common_swizzle,
- };
- ALIAS_MV(mikasa_primo)
- #endif