diff options
Diffstat (limited to 'arch/mips/sni/irq.c')
| -rw-r--r-- | arch/mips/sni/irq.c | 197 |
1 files changed, 43 insertions, 154 deletions
diff --git a/arch/mips/sni/irq.c b/arch/mips/sni/irq.c index 952038aa4b9..ac61b90bcc6 100644 --- a/arch/mips/sni/irq.c +++ b/arch/mips/sni/irq.c @@ -5,167 +5,45 @@ * * Copyright (C) 1992 Linus Torvalds * Copyright (C) 1994 - 2000 Ralf Baechle + * Copyright (C) 2006 Thomas Bogendoerfer */ #include <linux/delay.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/kernel.h> -#include <linux/spinlock.h> #include <asm/i8259.h> #include <asm/io.h> #include <asm/sni.h> +#include <asm/irq.h> +#include <asm/irq_cpu.h> -DEFINE_SPINLOCK(pciasic_lock); +void (*sni_hwint)(void); -extern asmlinkage void sni_rm200_pci_handle_int(void); - -static void enable_pciasic_irq(unsigned int irq) -{ - unsigned int mask = 1 << (irq - PCIMT_IRQ_INT2); - unsigned long flags; - - spin_lock_irqsave(&pciasic_lock, flags); - *(volatile u8 *) PCIMT_IRQSEL |= mask; - spin_unlock_irqrestore(&pciasic_lock, flags); -} - -static unsigned int startup_pciasic_irq(unsigned int irq) +asmlinkage void plat_irq_dispatch(void) { - enable_pciasic_irq(irq); - return 0; /* never anything pending */ + sni_hwint(); } -#define shutdown_pciasic_irq disable_pciasic_irq - -void disable_pciasic_irq(unsigned int irq) +/* ISA irq handler */ +static irqreturn_t sni_isa_irq_handler(int dummy, void *p) { - unsigned int mask = ~(1 << (irq - PCIMT_IRQ_INT2)); - unsigned long flags; - - spin_lock_irqsave(&pciasic_lock, flags); - *(volatile u8 *) PCIMT_IRQSEL &= mask; - spin_unlock_irqrestore(&pciasic_lock, flags); -} - -#define mask_and_ack_pciasic_irq disable_pciasic_irq - -static void end_pciasic_irq(unsigned int irq) -{ - if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) - enable_pciasic_irq(irq); -} - -static struct hw_interrupt_type pciasic_irq_type = { - .typename = "ASIC-PCI", - .startup = startup_pciasic_irq, - .shutdown = shutdown_pciasic_irq, - .enable = enable_pciasic_irq, - .disable = disable_pciasic_irq, - .ack = mask_and_ack_pciasic_irq, - .end = end_pciasic_irq, -}; - -/* - * hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug - * button interrupts. Later ... - */ -void pciasic_hwint0(struct pt_regs *regs) -{ - panic("Received int0 but no handler yet ..."); -} - -/* This interrupt was used for the com1 console on the first prototypes. */ -void pciasic_hwint2(struct pt_regs *regs) -{ - /* I think this shouldn't happen on production machines. */ - panic("hwint2 and no handler yet"); -} - -/* hwint5 is the r4k count / compare interrupt */ -void pciasic_hwint5(struct pt_regs *regs) -{ - panic("hwint5 and no handler yet"); -} - -static unsigned int ls1bit8(unsigned int x) -{ - int b = 7, s; - - s = 4; if ((x & 0x0f) == 0) s = 0; b -= s; x <<= s; - s = 2; if ((x & 0x30) == 0) s = 0; b -= s; x <<= s; - s = 1; if ((x & 0x40) == 0) s = 0; b -= s; - - return b; -} - -/* - * hwint 1 deals with EISA and SCSI interrupts, - * - * The EISA_INT bit in CSITPEND is high active, all others are low active. - */ -void pciasic_hwint1(struct pt_regs *regs) -{ - u8 pend = *(volatile char *)PCIMT_CSITPEND; - unsigned long flags; - - if (pend & IT_EISA) { - int irq; - /* - * Note: ASIC PCI's builtin interrupt achknowledge feature is - * broken. Using it may result in loss of some or all i8259 - * interupts, so don't use PCIMT_INT_ACKNOWLEDGE ... - */ - irq = i8259_irq(); - if (unlikely(irq < 0)) - return; - - do_IRQ(irq, regs); - } - - if (!(pend & IT_SCSI)) { - flags = read_c0_status(); - clear_c0_status(ST0_IM); - do_IRQ(PCIMT_IRQ_SCSI, regs); - write_c0_status(flags); - } -} - -/* - * hwint 3 should deal with the PCI A - D interrupts, - */ -void pciasic_hwint3(struct pt_regs *regs) -{ - u8 pend = *(volatile char *)PCIMT_CSITPEND; int irq; - pend &= (IT_INTA | IT_INTB | IT_INTC | IT_INTD); - clear_c0_status(IE_IRQ3); - irq = PCIMT_IRQ_INT2 + ls1bit8(pend); - do_IRQ(irq, regs); - set_c0_status(IE_IRQ3); -} + irq = i8259_irq(); + if (unlikely(irq < 0)) + return IRQ_NONE; -/* - * hwint 4 is used for only the onboard PCnet 32. - */ -void pciasic_hwint4(struct pt_regs *regs) -{ - clear_c0_status(IE_IRQ4); - do_IRQ(PCIMT_IRQ_ETHERNET, regs); - set_c0_status(IE_IRQ4); + generic_handle_irq(irq); + return IRQ_HANDLED; } -void __init init_pciasic(void) -{ - unsigned long flags; - - spin_lock_irqsave(&pciasic_lock, flags); - * (volatile u8 *) PCIMT_IRQSEL = - IT_EISA | IT_INTA | IT_INTB | IT_INTC | IT_INTD; - spin_unlock_irqrestore(&pciasic_lock, flags); -} +struct irqaction sni_isa_irq = { + .handler = sni_isa_irq_handler, + .name = "ISA", + .flags = IRQF_SHARED +}; /* * On systems with i8259-style interrupt controllers we assume for @@ -174,20 +52,31 @@ void __init init_pciasic(void) */ void __init arch_init_irq(void) { - int i; - - set_except_vector(0, sni_rm200_pci_handle_int); - init_i8259_irqs(); /* Integrated i8259 */ - init_pciasic(); - - /* Actually we've got more interrupts to handle ... */ - for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_ETHERNET; i++) { - irq_desc[i].status = IRQ_DISABLED; - irq_desc[i].action = 0; - irq_desc[i].depth = 1; - irq_desc[i].handler = &pciasic_irq_type; + switch (sni_brd_type) { + case SNI_BRD_10: + case SNI_BRD_10NEW: + case SNI_BRD_TOWER_OASIC: + case SNI_BRD_MINITOWER: + sni_a20r_irq_init(); + break; + + case SNI_BRD_PCI_TOWER: + sni_pcit_irq_init(); + break; + + case SNI_BRD_PCI_TOWER_CPLUS: + sni_pcit_cplus_irq_init(); + break; + + case SNI_BRD_RM200: + sni_rm200_irq_init(); + break; + + case SNI_BRD_PCI_MTOWER: + case SNI_BRD_PCI_DESKTOP: + case SNI_BRD_PCI_MTOWER_CPLUS: + sni_pcimt_irq_init(); + break; } - - change_c0_status(ST0_IM, IE_IRQ1|IE_IRQ2|IE_IRQ3|IE_IRQ4); } |