diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/mips/pmcs-msp71xx/msp_irq_cic.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/arch/mips/pmcs-msp71xx/msp_irq_cic.c b/arch/mips/pmcs-msp71xx/msp_irq_cic.c new file mode 100644 index 000000000..8b9cf6463 --- /dev/null +++ b/arch/mips/pmcs-msp71xx/msp_irq_cic.c @@ -0,0 +1,212 @@ +/* + * Copyright 2010 PMC-Sierra, Inc, derived from irq_cpu.c + * + * This file define the irq handler for MSP CIC subsystem interrupts. + * + * 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. + */ + +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/bitops.h> +#include <linux/irq.h> + +#include <asm/mipsregs.h> + +#include <msp_cic_int.h> +#include <msp_regs.h> + +/* + * External API + */ +extern void msp_per_irq_init(void); +extern void msp_per_irq_dispatch(void); + + +/* + * Convenience Macro. Should be somewhere generic. + */ +#define get_current_vpe() \ + ((read_c0_tcbind() >> TCBIND_CURVPE_SHIFT) & TCBIND_CURVPE) + +#ifdef CONFIG_SMP + +#define LOCK_VPE(flags, mtflags) \ +do { \ + local_irq_save(flags); \ + mtflags = dmt(); \ +} while (0) + +#define UNLOCK_VPE(flags, mtflags) \ +do { \ + emt(mtflags); \ + local_irq_restore(flags);\ +} while (0) + +#define LOCK_CORE(flags, mtflags) \ +do { \ + local_irq_save(flags); \ + mtflags = dvpe(); \ +} while (0) + +#define UNLOCK_CORE(flags, mtflags) \ +do { \ + evpe(mtflags); \ + local_irq_restore(flags);\ +} while (0) + +#else + +#define LOCK_VPE(flags, mtflags) +#define UNLOCK_VPE(flags, mtflags) +#endif + +/* ensure writes to cic are completed */ +static inline void cic_wmb(void) +{ + const volatile void __iomem *cic_mem = CIC_VPE0_MSK_REG; + volatile u32 dummy_read; + + wmb(); + dummy_read = __raw_readl(cic_mem); + dummy_read++; +} + +static void unmask_cic_irq(struct irq_data *d) +{ + volatile u32 *cic_msk_reg = CIC_VPE0_MSK_REG; + int vpe; +#ifdef CONFIG_SMP + unsigned int mtflags; + unsigned long flags; + + /* + * Make sure we have IRQ affinity. It may have changed while + * we were processing the IRQ. + */ + if (!cpumask_test_cpu(smp_processor_id(), + irq_data_get_affinity_mask(d))) + return; +#endif + + vpe = get_current_vpe(); + LOCK_VPE(flags, mtflags); + cic_msk_reg[vpe] |= (1 << (d->irq - MSP_CIC_INTBASE)); + UNLOCK_VPE(flags, mtflags); + cic_wmb(); +} + +static void mask_cic_irq(struct irq_data *d) +{ + volatile u32 *cic_msk_reg = CIC_VPE0_MSK_REG; + int vpe = get_current_vpe(); +#ifdef CONFIG_SMP + unsigned long flags, mtflags; +#endif + LOCK_VPE(flags, mtflags); + cic_msk_reg[vpe] &= ~(1 << (d->irq - MSP_CIC_INTBASE)); + UNLOCK_VPE(flags, mtflags); + cic_wmb(); +} +static void msp_cic_irq_ack(struct irq_data *d) +{ + mask_cic_irq(d); + /* + * Only really necessary for 18, 16-14 and sometimes 3:0 + * (since these can be edge sensitive) but it doesn't + * hurt for the others + */ + *CIC_STS_REG = (1 << (d->irq - MSP_CIC_INTBASE)); +} + +/* Note: Limiting to VSMP. */ + +#ifdef CONFIG_MIPS_MT_SMP +static int msp_cic_irq_set_affinity(struct irq_data *d, + const struct cpumask *cpumask, bool force) +{ + int cpu; + unsigned long flags; + unsigned int mtflags; + unsigned long imask = (1 << (d->irq - MSP_CIC_INTBASE)); + volatile u32 *cic_mask = (volatile u32 *)CIC_VPE0_MSK_REG; + + /* timer balancing should be disabled in kernel code */ + BUG_ON(d->irq == MSP_INT_VPE0_TIMER || d->irq == MSP_INT_VPE1_TIMER); + + LOCK_CORE(flags, mtflags); + /* enable if any of each VPE's TCs require this IRQ */ + for_each_online_cpu(cpu) { + if (cpumask_test_cpu(cpu, cpumask)) + cic_mask[cpu] |= imask; + else + cic_mask[cpu] &= ~imask; + + } + + UNLOCK_CORE(flags, mtflags); + return 0; + +} +#endif + +static struct irq_chip msp_cic_irq_controller = { + .name = "MSP_CIC", + .irq_mask = mask_cic_irq, + .irq_mask_ack = msp_cic_irq_ack, + .irq_unmask = unmask_cic_irq, + .irq_ack = msp_cic_irq_ack, +#ifdef CONFIG_MIPS_MT_SMP + .irq_set_affinity = msp_cic_irq_set_affinity, +#endif +}; + +void __init msp_cic_irq_init(void) +{ + int i; + /* Mask/clear interrupts. */ + *CIC_VPE0_MSK_REG = 0x00000000; + *CIC_VPE1_MSK_REG = 0x00000000; + *CIC_STS_REG = 0xFFFFFFFF; + /* + * The MSP7120 RG and EVBD boards use IRQ[6:4] for PCI. + * These inputs map to EXT_INT_POL[6:4] inside the CIC. + * They are to be active low, level sensitive. + */ + *CIC_EXT_CFG_REG &= 0xFFFF8F8F; + + /* initialize all the IRQ descriptors */ + for (i = MSP_CIC_INTBASE ; i < MSP_CIC_INTBASE + 32 ; i++) { + irq_set_chip_and_handler(i, &msp_cic_irq_controller, + handle_level_irq); + } + + /* Initialize the PER interrupt sub-system */ + msp_per_irq_init(); +} + +/* CIC masked by CIC vector processing before dispatch called */ +void msp_cic_irq_dispatch(void) +{ + volatile u32 *cic_msk_reg = (volatile u32 *)CIC_VPE0_MSK_REG; + u32 cic_mask; + u32 pending; + int cic_status = *CIC_STS_REG; + cic_mask = cic_msk_reg[get_current_vpe()]; + pending = cic_status & cic_mask; + if (pending & (1 << (MSP_INT_VPE0_TIMER - MSP_CIC_INTBASE))) { + do_IRQ(MSP_INT_VPE0_TIMER); + } else if (pending & (1 << (MSP_INT_VPE1_TIMER - MSP_CIC_INTBASE))) { + do_IRQ(MSP_INT_VPE1_TIMER); + } else if (pending & (1 << (MSP_INT_PER - MSP_CIC_INTBASE))) { + msp_per_irq_dispatch(); + } else if (pending) { + do_IRQ(ffs(pending) + MSP_CIC_INTBASE - 1); + } else{ + spurious_interrupt(); + } +} |