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Diffstat (limited to 'arch/mips/ite-boards/generic/irq.c')
| -rw-r--r-- | arch/mips/ite-boards/generic/irq.c | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/arch/mips/ite-boards/generic/irq.c b/arch/mips/ite-boards/generic/irq.c new file mode 100644 index 00000000000..cb71b9024d6 --- /dev/null +++ b/arch/mips/ite-boards/generic/irq.c @@ -0,0 +1,304 @@ +/* + * BRIEF MODULE DESCRIPTION + * ITE 8172G interrupt/setup routines. + * + * Copyright 2000,2001 MontaVista Software Inc. + * Author: MontaVista Software, Inc. + * ppopov@mvista.com or source@mvista.com + * + * Part of this file was derived from Carsten Langgaard's + * arch/mips/mips-boards/atlas/atlas_int.c. + * + * Carsten Langgaard, carstenl@mips.com + * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/kernel_stat.h> +#include <linux/module.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/timex.h> +#include <linux/slab.h> +#include <linux/random.h> +#include <linux/serial_reg.h> +#include <linux/bitops.h> + +#include <asm/bootinfo.h> +#include <asm/io.h> +#include <asm/mipsregs.h> +#include <asm/system.h> +#include <asm/it8172/it8172.h> +#include <asm/it8172/it8172_int.h> +#include <asm/it8172/it8172_dbg.h> + +/* revisit */ +#define EXT_IRQ0_TO_IP 2 /* IP 2 */ +#define EXT_IRQ5_TO_IP 7 /* IP 7 */ + +#define ALLINTS_NOTIMER (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4) + +void disable_it8172_irq(unsigned int irq_nr); +void enable_it8172_irq(unsigned int irq_nr); + +extern void set_debug_traps(void); +extern void mips_timer_interrupt(int irq, struct pt_regs *regs); +extern asmlinkage void it8172_IRQ(void); + +struct it8172_intc_regs volatile *it8172_hw0_icregs = + (struct it8172_intc_regs volatile *)(KSEG1ADDR(IT8172_PCI_IO_BASE + IT_INTC_BASE)); + +static void disable_it8172_irq(unsigned int irq_nr) +{ + if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) { + /* LPC interrupt */ + it8172_hw0_icregs->lpc_mask |= + (1 << (irq_nr - IT8172_LPC_IRQ_BASE)); + } else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) { + /* Local Bus interrupt */ + it8172_hw0_icregs->lb_mask |= + (1 << (irq_nr - IT8172_LB_IRQ_BASE)); + } else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) { + /* PCI and other interrupts */ + it8172_hw0_icregs->pci_mask |= + (1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE)); + } else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) { + /* NMI interrupts */ + it8172_hw0_icregs->nmi_mask |= + (1 << (irq_nr - IT8172_NMI_IRQ_BASE)); + } else { + panic("disable_it8172_irq: bad irq %d", irq_nr); + } +} + +static void enable_it8172_irq(unsigned int irq_nr) +{ + if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) { + /* LPC interrupt */ + it8172_hw0_icregs->lpc_mask &= + ~(1 << (irq_nr - IT8172_LPC_IRQ_BASE)); + } + else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) { + /* Local Bus interrupt */ + it8172_hw0_icregs->lb_mask &= + ~(1 << (irq_nr - IT8172_LB_IRQ_BASE)); + } + else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) { + /* PCI and other interrupts */ + it8172_hw0_icregs->pci_mask &= + ~(1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE)); + } + else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) { + /* NMI interrupts */ + it8172_hw0_icregs->nmi_mask &= + ~(1 << (irq_nr - IT8172_NMI_IRQ_BASE)); + } + else { + panic("enable_it8172_irq: bad irq %d", irq_nr); + } +} + +static unsigned int startup_ite_irq(unsigned int irq) +{ + enable_it8172_irq(irq); + return 0; +} + +#define shutdown_ite_irq disable_it8172_irq +#define mask_and_ack_ite_irq disable_it8172_irq + +static void end_ite_irq(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) + enable_it8172_irq(irq); +} + +static struct hw_interrupt_type it8172_irq_type = { + "ITE8172", + startup_ite_irq, + shutdown_ite_irq, + enable_it8172_irq, + disable_it8172_irq, + mask_and_ack_ite_irq, + end_ite_irq, + NULL +}; + + +static void enable_none(unsigned int irq) { } +static unsigned int startup_none(unsigned int irq) { return 0; } +static void disable_none(unsigned int irq) { } +static void ack_none(unsigned int irq) { } + +/* startup is the same as "enable", shutdown is same as "disable" */ +#define shutdown_none disable_none +#define end_none enable_none + +static struct hw_interrupt_type cp0_irq_type = { + "CP0 Count", + startup_none, + shutdown_none, + enable_none, + disable_none, + ack_none, + end_none +}; + +void enable_cpu_timer(void) +{ + unsigned long flags; + + local_irq_save(flags); + set_c0_status(0x100 << EXT_IRQ5_TO_IP); + local_irq_restore(flags); +} + +void __init arch_init_irq(void) +{ + int i; + unsigned long flags; + + memset(irq_desc, 0, sizeof(irq_desc)); + set_except_vector(0, it8172_IRQ); + + /* mask all interrupts */ + it8172_hw0_icregs->lb_mask = 0xffff; + it8172_hw0_icregs->lpc_mask = 0xffff; + it8172_hw0_icregs->pci_mask = 0xffff; + it8172_hw0_icregs->nmi_mask = 0xffff; + + /* make all interrupts level triggered */ + it8172_hw0_icregs->lb_trigger = 0; + it8172_hw0_icregs->lpc_trigger = 0; + it8172_hw0_icregs->pci_trigger = 0; + it8172_hw0_icregs->nmi_trigger = 0; + + /* active level setting */ + /* uart, keyboard, and mouse are active high */ + it8172_hw0_icregs->lpc_level = (0x10 | 0x2 | 0x1000); + it8172_hw0_icregs->lb_level |= 0x20; + + /* keyboard and mouse are edge triggered */ + it8172_hw0_icregs->lpc_trigger |= (0x2 | 0x1000); + + +#if 0 + // Enable this piece of code to make internal USB interrupt + // edge triggered. + it8172_hw0_icregs->pci_trigger |= + (1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE)); + it8172_hw0_icregs->pci_level &= + ~(1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE)); +#endif + + for (i = 0; i <= IT8172_LAST_IRQ; i++) { + irq_desc[i].handler = &it8172_irq_type; + spin_lock_init(&irq_desc[i].lock); + } + irq_desc[MIPS_CPU_TIMER_IRQ].handler = &cp0_irq_type; + set_c0_status(ALLINTS_NOTIMER); +} + +void mips_spurious_interrupt(struct pt_regs *regs) +{ +#if 1 + return; +#else + unsigned long status, cause; + + printk("got spurious interrupt\n"); + status = read_c0_status(); + cause = read_c0_cause(); + printk("status %x cause %x\n", status, cause); + printk("epc %x badvaddr %x \n", regs->cp0_epc, regs->cp0_badvaddr); +#endif +} + +void it8172_hw0_irqdispatch(struct pt_regs *regs) +{ + int irq; + unsigned short intstatus = 0, status = 0; + + intstatus = it8172_hw0_icregs->intstatus; + if (intstatus & 0x8) { + panic("Got NMI interrupt"); + } else if (intstatus & 0x4) { + /* PCI interrupt */ + irq = 0; + status |= it8172_hw0_icregs->pci_req; + while (!(status & 0x1)) { + irq++; + status >>= 1; + } + irq += IT8172_PCI_DEV_IRQ_BASE; + } else if (intstatus & 0x1) { + /* Local Bus interrupt */ + irq = 0; + status |= it8172_hw0_icregs->lb_req; + while (!(status & 0x1)) { + irq++; + status >>= 1; + } + irq += IT8172_LB_IRQ_BASE; + } else if (intstatus & 0x2) { + /* LPC interrupt */ + /* Since some lpc interrupts are edge triggered, + * we could lose an interrupt this way because + * we acknowledge all ints at onces. Revisit. + */ + status |= it8172_hw0_icregs->lpc_req; + it8172_hw0_icregs->lpc_req = 0; /* acknowledge ints */ + irq = 0; + while (!(status & 0x1)) { + irq++; + status >>= 1; + } + irq += IT8172_LPC_IRQ_BASE; + } else + return; + + do_IRQ(irq, regs); +} + +void show_pending_irqs(void) +{ + fputs("intstatus: "); + put32(it8172_hw0_icregs->intstatus); + puts(""); + + fputs("pci_req: "); + put32(it8172_hw0_icregs->pci_req); + puts(""); + + fputs("lb_req: "); + put32(it8172_hw0_icregs->lb_req); + puts(""); + + fputs("lpc_req: "); + put32(it8172_hw0_icregs->lpc_req); + puts(""); +} |