X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fmips%2Fmips-boards%2Fmalta%2Fmalta_int.c;h=90ad5bf3e2f175c8dd3c5ab055860ae988c3fdb2;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=dd2db35966bcefff03f727beb4b923675a0b66cc;hpb=6a77f38946aaee1cd85eeec6cf4229b204c15071;p=linux-2.6.git diff --git a/arch/mips/mips-boards/malta/malta_int.c b/arch/mips/mips-boards/malta/malta_int.c index dd2db3596..90ad5bf3e 100644 --- a/arch/mips/mips-boards/malta/malta_int.c +++ b/arch/mips/mips-boards/malta/malta_int.c @@ -30,15 +30,18 @@ #include #include +#include #include +#include #include #include #include #include #include #include +#include -extern asmlinkage void mipsIRQ(void); +extern void mips_timer_interrupt(void); static DEFINE_SPINLOCK(mips_irq_lock); @@ -54,6 +57,8 @@ static inline int mips_pcibios_iack(void) switch(mips_revision_corid) { case MIPS_REVISION_CORID_CORE_MSC: case MIPS_REVISION_CORID_CORE_FPGA2: + case MIPS_REVISION_CORID_CORE_FPGA3: + case MIPS_REVISION_CORID_CORE_24K: case MIPS_REVISION_CORID_CORE_EMUL_MSC: MSC_READ(MSC01_PCI_IACK, irq); irq &= 0xff; @@ -91,88 +96,92 @@ static inline int mips_pcibios_iack(void) return irq; } -static inline int get_int(int *irq) +static inline int get_int(void) { unsigned long flags; - + int irq; spin_lock_irqsave(&mips_irq_lock, flags); - *irq = mips_pcibios_iack(); + irq = mips_pcibios_iack(); /* - * IRQ7 is used to detect spurious interrupts. - * The interrupt acknowledge cycle returns IRQ7, if no - * interrupts is requested. - * We can differentiate between this situation and a - * "Normal" IRQ7 by reading the ISR. + * The only way we can decide if an interrupt is spurious + * is by checking the 8259 registers. This needs a spinlock + * on an SMP system, so leave it up to the generic code... */ - if (*irq == 7) - { - outb(PIIX4_OCW3_SEL | PIIX4_OCW3_ISR, - PIIX4_ICTLR1_OCW3); - if (!(inb(PIIX4_ICTLR1_OCW3) & (1 << 7))) { - spin_unlock_irqrestore(&mips_irq_lock, flags); - printk("We got a spurious interrupt from PIIX4.\n"); - atomic_inc(&irq_err_count); - return -1; /* Spurious interrupt. */ - } - } spin_unlock_irqrestore(&mips_irq_lock, flags); - return 0; + return irq; } -void malta_hw0_irqdispatch(struct pt_regs *regs) +static void malta_hw0_irqdispatch(void) { int irq; - if (get_int(&irq)) - return; /* interrupt has already been cleared */ + irq = get_int(); + if (irq < 0) { + return; /* interrupt has already been cleared */ + } - do_IRQ(irq, regs); + do_IRQ(MALTA_INT_BASE + irq); } -void corehi_irqdispatch(struct pt_regs *regs) +static void corehi_irqdispatch(void) { - unsigned int data,datahi; - - /* Mask out corehi interrupt. */ - clear_c0_status(IE_IRQ3); + unsigned int intedge, intsteer, pcicmd, pcibadaddr; + unsigned int pcimstat, intisr, inten, intpol; + unsigned int intrcause,datalo,datahi; + struct pt_regs *regs = get_irq_regs(); printk("CoreHI interrupt, shouldn't happen, so we die here!!!\n"); - printk("epc : %08lx\nStatus: %08lx\nCause : %08lx\nbadVaddr : %08lx\n" -, regs->cp0_epc, regs->cp0_status, regs->cp0_cause, regs->cp0_badvaddr); + printk("epc : %08lx\nStatus: %08lx\n" + "Cause : %08lx\nbadVaddr : %08lx\n", + regs->cp0_epc, regs->cp0_status, + regs->cp0_cause, regs->cp0_badvaddr); + + /* Read all the registers and then print them as there is a + problem with interspersed printk's upsetting the Bonito controller. + Do it for the others too. + */ + switch(mips_revision_corid) { case MIPS_REVISION_CORID_CORE_MSC: case MIPS_REVISION_CORID_CORE_FPGA2: - case MIPS_REVISION_CORID_CORE_EMUL_MSC: + case MIPS_REVISION_CORID_CORE_FPGA3: + case MIPS_REVISION_CORID_CORE_24K: + case MIPS_REVISION_CORID_CORE_EMUL_MSC: + ll_msc_irq(); break; case MIPS_REVISION_CORID_QED_RM5261: case MIPS_REVISION_CORID_CORE_LV: case MIPS_REVISION_CORID_CORE_FPGA: case MIPS_REVISION_CORID_CORE_FPGAR2: - data = GT_READ(GT_INTRCAUSE_OFS); - printk("GT_INTRCAUSE = %08x\n", data); - data = GT_READ(GT_CPUERR_ADDRLO_OFS); + intrcause = GT_READ(GT_INTRCAUSE_OFS); + datalo = GT_READ(GT_CPUERR_ADDRLO_OFS); datahi = GT_READ(GT_CPUERR_ADDRHI_OFS); - printk("GT_CPUERR_ADDR = %02x%08x\n", datahi, data); + printk("GT_INTRCAUSE = %08x\n", intrcause); + printk("GT_CPUERR_ADDR = %02x%08x\n", datahi, datalo); break; case MIPS_REVISION_CORID_BONITO64: case MIPS_REVISION_CORID_CORE_20K: case MIPS_REVISION_CORID_CORE_EMUL_BON: - data = BONITO_INTISR; - printk("BONITO_INTISR = %08x\n", data); - data = BONITO_INTEN; - printk("BONITO_INTEN = %08x\n", data); - data = BONITO_INTPOL; - printk("BONITO_INTPOL = %08x\n", data); - data = BONITO_INTEDGE; - printk("BONITO_INTEDGE = %08x\n", data); - data = BONITO_INTSTEER; - printk("BONITO_INTSTEER = %08x\n", data); - data = BONITO_PCICMD; - printk("BONITO_PCICMD = %08x\n", data); + pcibadaddr = BONITO_PCIBADADDR; + pcimstat = BONITO_PCIMSTAT; + intisr = BONITO_INTISR; + inten = BONITO_INTEN; + intpol = BONITO_INTPOL; + intedge = BONITO_INTEDGE; + intsteer = BONITO_INTSTEER; + pcicmd = BONITO_PCICMD; + printk("BONITO_INTISR = %08x\n", intisr); + printk("BONITO_INTEN = %08x\n", inten); + printk("BONITO_INTPOL = %08x\n", intpol); + printk("BONITO_INTEDGE = %08x\n", intedge); + printk("BONITO_INTSTEER = %08x\n", intsteer); + printk("BONITO_PCICMD = %08x\n", pcicmd); + printk("BONITO_PCIBADADDR = %08x\n", pcibadaddr); + printk("BONITO_PCIMSTAT = %08x\n", pcimstat); break; } @@ -180,8 +189,162 @@ void corehi_irqdispatch(struct pt_regs *regs) die("CoreHi interrupt", regs); } +static inline int clz(unsigned long x) +{ + __asm__ ( + " .set push \n" + " .set mips32 \n" + " clz %0, %1 \n" + " .set pop \n" + : "=r" (x) + : "r" (x)); + + return x; +} + +/* + * Version of ffs that only looks at bits 12..15. + */ +static inline unsigned int irq_ffs(unsigned int pending) +{ +#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64) + return -clz(pending) + 31 - CAUSEB_IP; +#else + unsigned int a0 = 7; + unsigned int t0; + + t0 = pending & 0xf000; + t0 = t0 < 1; + t0 = t0 << 2; + a0 = a0 - t0; + pending = pending << t0; + + t0 = pending & 0xc000; + t0 = t0 < 1; + t0 = t0 << 1; + a0 = a0 - t0; + pending = pending << t0; + + t0 = pending & 0x8000; + t0 = t0 < 1; + //t0 = t0 << 2; + a0 = a0 - t0; + //pending = pending << t0; + + return a0; +#endif +} + +/* + * IRQs on the Malta board look basically (barring software IRQs which we + * don't use at all and all external interrupt sources are combined together + * on hardware interrupt 0 (MIPS IRQ 2)) like: + * + * MIPS IRQ Source + * -------- ------ + * 0 Software (ignored) + * 1 Software (ignored) + * 2 Combined hardware interrupt (hw0) + * 3 Hardware (ignored) + * 4 Hardware (ignored) + * 5 Hardware (ignored) + * 6 Hardware (ignored) + * 7 R4k timer (what we use) + * + * We handle the IRQ according to _our_ priority which is: + * + * Highest ---- R4k Timer + * Lowest ---- Combined hardware interrupt + * + * then we just return, if multiple IRQs are pending then we will just take + * another exception, big deal. + */ + +asmlinkage void plat_irq_dispatch(void) +{ + unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM; + int irq; + + irq = irq_ffs(pending); + + if (irq == MIPSCPU_INT_I8259A) + malta_hw0_irqdispatch(); + else if (irq > 0) + do_IRQ(MIPSCPU_INT_BASE + irq); + else + spurious_interrupt(); +} + +static struct irqaction i8259irq = { + .handler = no_action, + .name = "XT-PIC cascade" +}; + +static struct irqaction corehi_irqaction = { + .handler = no_action, + .name = "CoreHi" +}; + +msc_irqmap_t __initdata msc_irqmap[] = { + {MSC01C_INT_TMR, MSC01_IRQ_EDGE, 0}, + {MSC01C_INT_PCI, MSC01_IRQ_LEVEL, 0}, +}; +int __initdata msc_nr_irqs = sizeof(msc_irqmap)/sizeof(msc_irqmap_t); + +msc_irqmap_t __initdata msc_eicirqmap[] = { + {MSC01E_INT_SW0, MSC01_IRQ_LEVEL, 0}, + {MSC01E_INT_SW1, MSC01_IRQ_LEVEL, 0}, + {MSC01E_INT_I8259A, MSC01_IRQ_LEVEL, 0}, + {MSC01E_INT_SMI, MSC01_IRQ_LEVEL, 0}, + {MSC01E_INT_COREHI, MSC01_IRQ_LEVEL, 0}, + {MSC01E_INT_CORELO, MSC01_IRQ_LEVEL, 0}, + {MSC01E_INT_TMR, MSC01_IRQ_EDGE, 0}, + {MSC01E_INT_PCI, MSC01_IRQ_LEVEL, 0}, + {MSC01E_INT_PERFCTR, MSC01_IRQ_LEVEL, 0}, + {MSC01E_INT_CPUCTR, MSC01_IRQ_LEVEL, 0} +}; +int __initdata msc_nr_eicirqs = sizeof(msc_eicirqmap)/sizeof(msc_irqmap_t); + void __init arch_init_irq(void) { - set_except_vector(0, mipsIRQ); init_i8259_irqs(); + + if (!cpu_has_veic) + mips_cpu_irq_init (MIPSCPU_INT_BASE); + + switch(mips_revision_corid) { + case MIPS_REVISION_CORID_CORE_MSC: + case MIPS_REVISION_CORID_CORE_FPGA2: + case MIPS_REVISION_CORID_CORE_FPGA3: + case MIPS_REVISION_CORID_CORE_24K: + case MIPS_REVISION_CORID_CORE_EMUL_MSC: + if (cpu_has_veic) + init_msc_irqs (MSC01E_INT_BASE, msc_eicirqmap, msc_nr_eicirqs); + else + init_msc_irqs (MSC01C_INT_BASE, msc_irqmap, msc_nr_irqs); + } + + if (cpu_has_veic) { + set_vi_handler (MSC01E_INT_I8259A, malta_hw0_irqdispatch); + set_vi_handler (MSC01E_INT_COREHI, corehi_irqdispatch); + setup_irq (MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq); + setup_irq (MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction); + } + else if (cpu_has_vint) { + set_vi_handler (MIPSCPU_INT_I8259A, malta_hw0_irqdispatch); + set_vi_handler (MIPSCPU_INT_COREHI, corehi_irqdispatch); +#ifdef CONFIG_MIPS_MT_SMTC + setup_irq_smtc (MIPSCPU_INT_BASE+MIPSCPU_INT_I8259A, &i8259irq, + (0x100 << MIPSCPU_INT_I8259A)); + setup_irq_smtc (MIPSCPU_INT_BASE+MIPSCPU_INT_COREHI, + &corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI)); +#else /* Not SMTC */ + setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_I8259A, &i8259irq); + setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_COREHI, &corehi_irqaction); +#endif /* CONFIG_MIPS_MT_SMTC */ + } + else { + setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_I8259A, &i8259irq); + setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_COREHI, &corehi_irqaction); + } }