diff options
Diffstat (limited to 'arch/sh/kernel/cpu/sh4/irq_intc2.c')
| -rw-r--r-- | arch/sh/kernel/cpu/sh4/irq_intc2.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh4/irq_intc2.c b/arch/sh/kernel/cpu/sh4/irq_intc2.c new file mode 100644 index 000000000000..099ebbf89745 --- /dev/null +++ b/arch/sh/kernel/cpu/sh4/irq_intc2.c @@ -0,0 +1,222 @@ +/* + * linux/arch/sh/kernel/irq_intc2.c + * + * Copyright (C) 2001 David J. Mckay (david.mckay@st.com) + * + * May be copied or modified under the terms of the GNU General Public + * License. See linux/COPYING for more information. + * + * Interrupt handling for INTC2-based IRQ. + * + * These are the "new Hitachi style" interrupts, as present on the + * Hitachi 7751 and the STM ST40 STB1. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/irq.h> + +#include <asm/system.h> +#include <asm/io.h> +#include <asm/machvec.h> + + +struct intc2_data { + unsigned char msk_offset; + unsigned char msk_shift; +#ifdef CONFIG_CPU_SUBTYPE_ST40 + int (*clear_irq) (int); +#endif +}; + + +static struct intc2_data intc2_data[NR_INTC2_IRQS]; + +static void enable_intc2_irq(unsigned int irq); +static void disable_intc2_irq(unsigned int irq); + +/* shutdown is same as "disable" */ +#define shutdown_intc2_irq disable_intc2_irq + +static void mask_and_ack_intc2(unsigned int); +static void end_intc2_irq(unsigned int irq); + +static unsigned int startup_intc2_irq(unsigned int irq) +{ + enable_intc2_irq(irq); + return 0; /* never anything pending */ +} + +static struct hw_interrupt_type intc2_irq_type = { + "INTC2-IRQ", + startup_intc2_irq, + shutdown_intc2_irq, + enable_intc2_irq, + disable_intc2_irq, + mask_and_ack_intc2, + end_intc2_irq +}; + +static void disable_intc2_irq(unsigned int irq) +{ + int irq_offset = irq - INTC2_FIRST_IRQ; + int msk_shift, msk_offset; + + // Sanity check + if((irq_offset<0) || (irq_offset>=NR_INTC2_IRQS)) + return; + + msk_shift = intc2_data[irq_offset].msk_shift; + msk_offset = intc2_data[irq_offset].msk_offset; + + ctrl_outl(1<<msk_shift, + INTC2_BASE+INTC2_INTMSK_OFFSET+msk_offset); +} + +static void enable_intc2_irq(unsigned int irq) +{ + int irq_offset = irq - INTC2_FIRST_IRQ; + int msk_shift, msk_offset; + + /* Sanity check */ + if((irq_offset<0) || (irq_offset>=NR_INTC2_IRQS)) + return; + + msk_shift = intc2_data[irq_offset].msk_shift; + msk_offset = intc2_data[irq_offset].msk_offset; + + ctrl_outl(1<<msk_shift, + INTC2_BASE+INTC2_INTMSKCLR_OFFSET+msk_offset); +} + +static void mask_and_ack_intc2(unsigned int irq) +{ + disable_intc2_irq(irq); +} + +static void end_intc2_irq(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) + enable_intc2_irq(irq); + +#ifdef CONFIG_CPU_SUBTYPE_ST40 + if (intc2_data[irq - INTC2_FIRST_IRQ].clear_irq) + intc2_data[irq - INTC2_FIRST_IRQ].clear_irq (irq); +#endif +} + +/* + * Setup an INTC2 style interrupt. + * NOTE: Unlike IPR interrupts, parameters are not shifted by this code, + * allowing the use of the numbers straight out of the datasheet. + * For example: + * PIO1 which is INTPRI00[19,16] and INTMSK00[13] + * would be: ^ ^ ^ ^ + * | | | | + * make_intc2_irq(84, 0, 16, 0, 13); + */ +void make_intc2_irq(unsigned int irq, + unsigned int ipr_offset, unsigned int ipr_shift, + unsigned int msk_offset, unsigned int msk_shift, + unsigned int priority) +{ + int irq_offset = irq - INTC2_FIRST_IRQ; + unsigned int flags; + unsigned long ipr; + + if((irq_offset<0) || (irq_offset>=NR_INTC2_IRQS)) + return; + + disable_irq_nosync(irq); + + /* Fill the data we need */ + intc2_data[irq_offset].msk_offset = msk_offset; + intc2_data[irq_offset].msk_shift = msk_shift; +#ifdef CONFIG_CPU_SUBTYPE_ST40 + intc2_data[irq_offset].clear_irq = NULL; +#endif + + /* Set the priority level */ + local_irq_save(flags); + + ipr=ctrl_inl(INTC2_BASE+INTC2_INTPRI_OFFSET+ipr_offset); + ipr&=~(0xf<<ipr_shift); + ipr|=(priority)<<ipr_shift; + ctrl_outl(ipr, INTC2_BASE+INTC2_INTPRI_OFFSET+ipr_offset); + + local_irq_restore(flags); + + irq_desc[irq].handler=&intc2_irq_type; + + disable_intc2_irq(irq); +} + +#ifdef CONFIG_CPU_SUBTYPE_ST40 + +struct intc2_init { + unsigned short irq; + unsigned char ipr_offset, ipr_shift; + unsigned char msk_offset, msk_shift; +}; + +static struct intc2_init intc2_init_data[] __initdata = { + {64, 0, 0, 0, 0}, /* PCI serr */ + {65, 0, 4, 0, 1}, /* PCI err */ + {66, 0, 4, 0, 2}, /* PCI ad */ + {67, 0, 4, 0, 3}, /* PCI pwd down */ + {72, 0, 8, 0, 5}, /* DMAC INT0 */ + {73, 0, 8, 0, 6}, /* DMAC INT1 */ + {74, 0, 8, 0, 7}, /* DMAC INT2 */ + {75, 0, 8, 0, 8}, /* DMAC INT3 */ + {76, 0, 8, 0, 9}, /* DMAC INT4 */ + {78, 0, 8, 0, 11}, /* DMAC ERR */ + {80, 0, 12, 0, 12}, /* PIO0 */ + {84, 0, 16, 0, 13}, /* PIO1 */ + {88, 0, 20, 0, 14}, /* PIO2 */ + {112, 4, 0, 4, 0}, /* Mailbox */ +#ifdef CONFIG_CPU_SUBTYPE_ST40GX1 + {116, 4, 4, 4, 4}, /* SSC0 */ + {120, 4, 8, 4, 8}, /* IR Blaster */ + {124, 4, 12, 4, 12}, /* USB host */ + {128, 4, 16, 4, 16}, /* Video processor BLITTER */ + {132, 4, 20, 4, 20}, /* UART0 */ + {134, 4, 20, 4, 22}, /* UART2 */ + {136, 4, 24, 4, 24}, /* IO_PIO0 */ + {140, 4, 28, 4, 28}, /* EMPI */ + {144, 8, 0, 8, 0}, /* MAFE */ + {148, 8, 4, 8, 4}, /* PWM */ + {152, 8, 8, 8, 8}, /* SSC1 */ + {156, 8, 12, 8, 12}, /* IO_PIO1 */ + {160, 8, 16, 8, 16}, /* USB target */ + {164, 8, 20, 8, 20}, /* UART1 */ + {168, 8, 24, 8, 24}, /* Teletext */ + {172, 8, 28, 8, 28}, /* VideoSync VTG */ + {173, 8, 28, 8, 29}, /* VideoSync DVP0 */ + {174, 8, 28, 8, 30}, /* VideoSync DVP1 */ +#endif +}; + +void __init init_IRQ_intc2(void) +{ + struct intc2_init *p; + + printk(KERN_ALERT "init_IRQ_intc2\n"); + + for (p = intc2_init_data; + p<intc2_init_data+ARRAY_SIZE(intc2_init_data); + p++) { + make_intc2_irq(p->irq, p->ipr_offset, p->ipr_shift, + p-> msk_offset, p->msk_shift, 13); + } +} + +/* Adds a termination callback to the interrupt */ +void intc2_add_clear_irq(int irq, int (*fn)(int)) +{ + if (irq < INTC2_FIRST_IRQ) + return; + + intc2_data[irq - INTC2_FIRST_IRQ].clear_irq = fn; +} + +#endif /* CONFIG_CPU_SUBTYPE_ST40 */ |