diff options
Diffstat (limited to 'kernel/arch/mips/pmcs-msp71xx/msp_irq.c')
| -rw-r--r-- | kernel/arch/mips/pmcs-msp71xx/msp_irq.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/kernel/arch/mips/pmcs-msp71xx/msp_irq.c b/kernel/arch/mips/pmcs-msp71xx/msp_irq.c new file mode 100644 index 000000000..8d53d7a2e --- /dev/null +++ b/kernel/arch/mips/pmcs-msp71xx/msp_irq.c @@ -0,0 +1,159 @@ +/* + * IRQ vector handles + * + * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/ptrace.h> +#include <linux/time.h> + +#include <asm/irq_cpu.h> +#include <asm/setup.h> + +#include <msp_int.h> + +/* SLP bases systems */ +extern void msp_slp_irq_init(void); +extern void msp_slp_irq_dispatch(void); + +/* CIC based systems */ +extern void msp_cic_irq_init(void); +extern void msp_cic_irq_dispatch(void); + +/* VSMP support init */ +extern void msp_vsmp_int_init(void); + +/* vectored interrupt implementation */ + +/* SW0/1 interrupts are used for SMP */ +static inline void mac0_int_dispatch(void) { do_IRQ(MSP_INT_MAC0); } +static inline void mac1_int_dispatch(void) { do_IRQ(MSP_INT_MAC1); } +static inline void mac2_int_dispatch(void) { do_IRQ(MSP_INT_SAR); } +static inline void usb_int_dispatch(void) { do_IRQ(MSP_INT_USB); } +static inline void sec_int_dispatch(void) { do_IRQ(MSP_INT_SEC); } + +/* + * The PMC-Sierra MSP interrupts are arranged in a 3 level cascaded + * hierarchical system. The first level are the direct MIPS interrupts + * and are assigned the interrupt range 0-7. The second level is the SLM + * interrupt controller and is assigned the range 8-39. The third level + * comprises the Peripherial block, the PCI block, the PCI MSI block and + * the SLP. The PCI interrupts and the SLP errors are handled by the + * relevant subsystems so the core interrupt code needs only concern + * itself with the Peripheral block. These are assigned interrupts in + * the range 40-71. + */ + +asmlinkage void plat_irq_dispatch(void) +{ + u32 pending; + + pending = read_c0_status() & read_c0_cause(); + + /* + * jump to the correct interrupt routine + * These are arranged in priority order and the timer + * comes first! + */ + +#ifdef CONFIG_IRQ_MSP_CIC /* break out the CIC stuff for now */ + if (pending & C_IRQ4) /* do the peripherals first, that's the timer */ + msp_cic_irq_dispatch(); + + else if (pending & C_IRQ0) + do_IRQ(MSP_INT_MAC0); + + else if (pending & C_IRQ1) + do_IRQ(MSP_INT_MAC1); + + else if (pending & C_IRQ2) + do_IRQ(MSP_INT_USB); + + else if (pending & C_IRQ3) + do_IRQ(MSP_INT_SAR); + + else if (pending & C_IRQ5) + do_IRQ(MSP_INT_SEC); + +#else + if (pending & C_IRQ5) + do_IRQ(MSP_INT_TIMER); + + else if (pending & C_IRQ0) + do_IRQ(MSP_INT_MAC0); + + else if (pending & C_IRQ1) + do_IRQ(MSP_INT_MAC1); + + else if (pending & C_IRQ3) + do_IRQ(MSP_INT_VE); + + else if (pending & C_IRQ4) + msp_slp_irq_dispatch(); +#endif + + else if (pending & C_SW0) /* do software after hardware */ + do_IRQ(MSP_INT_SW0); + + else if (pending & C_SW1) + do_IRQ(MSP_INT_SW1); +} + +static struct irqaction cic_cascade_msp = { + .handler = no_action, + .name = "MSP CIC cascade", + .flags = IRQF_NO_THREAD, +}; + +static struct irqaction per_cascade_msp = { + .handler = no_action, + .name = "MSP PER cascade", + .flags = IRQF_NO_THREAD, +}; + +void __init arch_init_irq(void) +{ + /* assume we'll be using vectored interrupt mode except in UP mode*/ +#ifdef CONFIG_MIPS_MT + BUG_ON(!cpu_has_vint); +#endif + /* initialize the 1st-level CPU based interrupt controller */ + mips_cpu_irq_init(); + +#ifdef CONFIG_IRQ_MSP_CIC + msp_cic_irq_init(); +#ifdef CONFIG_MIPS_MT + set_vi_handler(MSP_INT_CIC, msp_cic_irq_dispatch); + set_vi_handler(MSP_INT_MAC0, mac0_int_dispatch); + set_vi_handler(MSP_INT_MAC1, mac1_int_dispatch); + set_vi_handler(MSP_INT_SAR, mac2_int_dispatch); + set_vi_handler(MSP_INT_USB, usb_int_dispatch); + set_vi_handler(MSP_INT_SEC, sec_int_dispatch); +#ifdef CONFIG_MIPS_MT_SMP + msp_vsmp_int_init(); +#endif /* CONFIG_MIPS_MT_SMP */ +#endif /* CONFIG_MIPS_MT */ + /* setup the cascaded interrupts */ + setup_irq(MSP_INT_CIC, &cic_cascade_msp); + setup_irq(MSP_INT_PER, &per_cascade_msp); + +#else + /* + * Setup the 2nd-level SLP register based interrupt controller. + * VSMP support support is not enabled for SLP. + */ + msp_slp_irq_init(); + + /* setup the cascaded SLP/PER interrupts */ + setup_irq(MSP_INT_SLP, &cic_cascade_msp); + setup_irq(MSP_INT_PER, &per_cascade_msp); +#endif +} |