sys_alcor.c
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上传日期:2013-02-24
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- /*
- * linux/arch/alpha/kernel/sys_alcor.c
- *
- * Copyright (C) 1995 David A Rusling
- * Copyright (C) 1996 Jay A Estabrook
- * Copyright (C) 1998, 1999 Richard Henderson
- *
- * Code supporting the ALCOR and XLT (XL-300/366/433).
- */
- #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 <linux/reboot.h>
- #include <asm/ptrace.h>
- #include <asm/system.h>
- #include <asm/io.h>
- #include <asm/dma.h>
- #include <asm/bitops.h>
- #include <asm/mmu_context.h>
- #include <asm/irq.h>
- #include <asm/pgtable.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 unsigned long cached_irq_mask;
- static inline void
- alcor_update_irq_hw(unsigned long mask)
- {
- *(vuip)GRU_INT_MASK = mask;
- mb();
- }
- static inline void
- alcor_enable_irq(unsigned int irq)
- {
- alcor_update_irq_hw(cached_irq_mask |= 1UL << (irq - 16));
- }
- static void
- alcor_disable_irq(unsigned int irq)
- {
- alcor_update_irq_hw(cached_irq_mask &= ~(1UL << (irq - 16)));
- }
- static void
- alcor_mask_and_ack_irq(unsigned int irq)
- {
- alcor_disable_irq(irq);
- /* On ALCOR/XLT, need to dismiss interrupt via GRU. */
- *(vuip)GRU_INT_CLEAR = 1 << (irq - 16); mb();
- *(vuip)GRU_INT_CLEAR = 0; mb();
- }
- static unsigned int
- alcor_startup_irq(unsigned int irq)
- {
- alcor_enable_irq(irq);
- return 0;
- }
- static void
- alcor_isa_mask_and_ack_irq(unsigned int irq)
- {
- i8259a_mask_and_ack_irq(irq);
- /* On ALCOR/XLT, need to dismiss interrupt via GRU. */
- *(vuip)GRU_INT_CLEAR = 0x80000000; mb();
- *(vuip)GRU_INT_CLEAR = 0; mb();
- }
- static void
- alcor_end_irq(unsigned int irq)
- {
- if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
- alcor_enable_irq(irq);
- }
- static struct hw_interrupt_type alcor_irq_type = {
- typename: "ALCOR",
- startup: alcor_startup_irq,
- shutdown: alcor_disable_irq,
- enable: alcor_enable_irq,
- disable: alcor_disable_irq,
- ack: alcor_mask_and_ack_irq,
- end: alcor_end_irq,
- };
- static void
- alcor_device_interrupt(unsigned long vector, struct pt_regs *regs)
- {
- unsigned long pld;
- unsigned int i;
- /* Read the interrupt summary register of the GRU */
- pld = (*(vuip)GRU_INT_REQ) & GRU_INT_REQ_BITS;
- /*
- * 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 == 31) {
- isa_device_interrupt(vector, regs);
- } else {
- handle_irq(16 + i, regs);
- }
- }
- }
- static void __init
- alcor_init_irq(void)
- {
- long i;
- if (alpha_using_srm)
- alpha_mv.device_interrupt = srm_device_interrupt;
- *(vuip)GRU_INT_MASK = 0; mb(); /* all disabled */
- *(vuip)GRU_INT_EDGE = 0; mb(); /* all are level */
- *(vuip)GRU_INT_HILO = 0x80000000U; mb(); /* ISA only HI */
- *(vuip)GRU_INT_CLEAR = 0; mb(); /* all clear */
- for (i = 16; i < 48; ++i) {
- /* On Alcor, at least, lines 20..30 are not connected
- and can generate spurrious interrupts if we turn them
- on while IRQ probing. */
- if (i >= 16+20 && i <= 16+30)
- continue;
- irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
- irq_desc[i].handler = &alcor_irq_type;
- }
- i8259a_irq_type.ack = alcor_isa_mask_and_ack_irq;
- init_i8259a_irqs();
- common_init_isa_dma();
- setup_irq(16+31, &isa_cascade_irqaction);
- }
- /*
- * PCI Fixup configuration.
- *
- * Summary @ GRU_INT_REQ:
- * Bit Meaning
- * 0 Interrupt Line A from slot 2
- * 1 Interrupt Line B from slot 2
- * 2 Interrupt Line C from slot 2
- * 3 Interrupt Line D from slot 2
- * 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 0
- * 9 Interrupt Line B from slot 0
- *10 Interrupt Line C from slot 0
- *11 Interrupt Line D from slot 0
- *12 Interrupt Line A from slot 4
- *13 Interrupt Line B from slot 4
- *14 Interrupt Line C from slot 4
- *15 Interrupt Line D from slot 4
- *16 Interrupt Line D from slot 3
- *17 Interrupt Line D from slot 3
- *18 Interrupt Line D from slot 3
- *19 Interrupt Line D from slot 3
- *20-30 Reserved
- *31 EISA interrupt
- *
- * The device to slot mapping looks like:
- *
- * Slot Device
- * 6 built-in TULIP (XLT only)
- * 7 PCI on board slot 0
- * 8 PCI on board slot 3
- * 9 PCI on board slot 4
- * 10 PCEB (PCI-EISA bridge)
- * 11 PCI on board slot 2
- * 12 PCI on board slot 1
- *
- *
- * 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
- alcor_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- static char irq_tab[7][5] __initdata = {
- /*INT INTA INTB INTC INTD */
- /* note: IDSEL 17 is XLT only */
- {16+13, 16+13, 16+13, 16+13, 16+13}, /* IdSel 17, TULIP */
- { 16+8, 16+8, 16+9, 16+10, 16+11}, /* IdSel 18, slot 0 */
- {16+16, 16+16, 16+17, 16+18, 16+19}, /* IdSel 19, slot 3 */
- {16+12, 16+12, 16+13, 16+14, 16+15}, /* IdSel 20, slot 4 */
- { -1, -1, -1, -1, -1}, /* IdSel 21, PCEB */
- { 16+0, 16+0, 16+1, 16+2, 16+3}, /* IdSel 22, slot 2 */
- { 16+4, 16+4, 16+5, 16+6, 16+7}, /* IdSel 23, slot 1 */
- };
- const long min_idsel = 6, max_idsel = 12, irqs_per_slot = 5;
- return COMMON_TABLE_LOOKUP;
- }
- static void
- alcor_kill_arch(int mode)
- {
- switch(mode) {
- case LINUX_REBOOT_CMD_RESTART:
- /* Who said DEC engineer's have no sense of humor? ;-) */
- if (alpha_using_srm) {
- *(vuip) GRU_RESET = 0x0000dead;
- mb();
- }
- break;
- case LINUX_REBOOT_CMD_HALT:
- break;
- case LINUX_REBOOT_CMD_POWER_OFF:
- break;
- }
- halt();
- }
- /*
- * The System Vectors
- */
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_ALCOR)
- struct alpha_machine_vector alcor_mv __initmv = {
- vector_name: "Alcor",
- 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: alcor_device_interrupt,
- init_arch: cia_init_arch,
- init_irq: alcor_init_irq,
- init_rtc: common_init_rtc,
- init_pci: cia_init_pci,
- kill_arch: alcor_kill_arch,
- pci_map_irq: alcor_map_irq,
- pci_swizzle: common_swizzle,
- sys: { cia: {
- gru_int_req_bits: ALCOR_GRU_INT_REQ_BITS
- }}
- };
- ALIAS_MV(alcor)
- #endif
- #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_XLT)
- struct alpha_machine_vector xlt_mv __initmv = {
- vector_name: "XLT",
- 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: alcor_device_interrupt,
- init_arch: cia_init_arch,
- init_irq: alcor_init_irq,
- init_rtc: common_init_rtc,
- init_pci: cia_init_pci,
- kill_arch: alcor_kill_arch,
- pci_map_irq: alcor_map_irq,
- pci_swizzle: common_swizzle,
- sys: { cia: {
- gru_int_req_bits: XLT_GRU_INT_REQ_BITS
- }}
- };
- ALIAS_MV(xlt)
- #endif