diff options
Diffstat (limited to 'arch/sh/boards/superh/microdev/irq.c')
| -rw-r--r-- | arch/sh/boards/superh/microdev/irq.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/arch/sh/boards/superh/microdev/irq.c b/arch/sh/boards/superh/microdev/irq.c new file mode 100644 index 00000000000..1298883eca4 --- /dev/null +++ b/arch/sh/boards/superh/microdev/irq.c @@ -0,0 +1,200 @@ +/* + * arch/sh/boards/superh/microdev/irq.c + * + * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com) + * + * SuperH SH4-202 MicroDev board support. + * + * May be copied or modified under the terms of the GNU General Public + * License. See linux/COPYING for more information. + */ + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/irq.h> + +#include <asm/system.h> +#include <asm/io.h> +#include <asm/mach/irq.h> + +#define NUM_EXTERNAL_IRQS 16 /* IRL0 .. IRL15 */ + + +static const struct { + unsigned char fpgaIrq; + unsigned char mapped; + const char *name; +} fpgaIrqTable[NUM_EXTERNAL_IRQS] = { + { 0, 0, "unused" }, /* IRQ #0 IRL=15 0x200 */ + { MICRODEV_FPGA_IRQ_KEYBOARD, 1, "keyboard" }, /* IRQ #1 IRL=14 0x220 */ + { MICRODEV_FPGA_IRQ_SERIAL1, 1, "Serial #1"}, /* IRQ #2 IRL=13 0x240 */ + { MICRODEV_FPGA_IRQ_ETHERNET, 1, "Ethernet" }, /* IRQ #3 IRL=12 0x260 */ + { MICRODEV_FPGA_IRQ_SERIAL2, 0, "Serial #2"}, /* IRQ #4 IRL=11 0x280 */ + { 0, 0, "unused" }, /* IRQ #5 IRL=10 0x2a0 */ + { 0, 0, "unused" }, /* IRQ #6 IRL=9 0x2c0 */ + { MICRODEV_FPGA_IRQ_USB_HC, 1, "USB" }, /* IRQ #7 IRL=8 0x2e0 */ + { MICRODEV_IRQ_PCI_INTA, 1, "PCI INTA" }, /* IRQ #8 IRL=7 0x300 */ + { MICRODEV_IRQ_PCI_INTB, 1, "PCI INTB" }, /* IRQ #9 IRL=6 0x320 */ + { MICRODEV_IRQ_PCI_INTC, 1, "PCI INTC" }, /* IRQ #10 IRL=5 0x340 */ + { MICRODEV_IRQ_PCI_INTD, 1, "PCI INTD" }, /* IRQ #11 IRL=4 0x360 */ + { MICRODEV_FPGA_IRQ_MOUSE, 1, "mouse" }, /* IRQ #12 IRL=3 0x380 */ + { MICRODEV_FPGA_IRQ_IDE2, 1, "IDE #2" }, /* IRQ #13 IRL=2 0x3a0 */ + { MICRODEV_FPGA_IRQ_IDE1, 1, "IDE #1" }, /* IRQ #14 IRL=1 0x3c0 */ + { 0, 0, "unused" }, /* IRQ #15 IRL=0 0x3e0 */ +}; + +#if (MICRODEV_LINUX_IRQ_KEYBOARD != 1) +# error Inconsistancy in defining the IRQ# for Keyboard! +#endif + +#if (MICRODEV_LINUX_IRQ_ETHERNET != 3) +# error Inconsistancy in defining the IRQ# for Ethernet! +#endif + +#if (MICRODEV_LINUX_IRQ_USB_HC != 7) +# error Inconsistancy in defining the IRQ# for USB! +#endif + +#if (MICRODEV_LINUX_IRQ_MOUSE != 12) +# error Inconsistancy in defining the IRQ# for PS/2 Mouse! +#endif + +#if (MICRODEV_LINUX_IRQ_IDE2 != 13) +# error Inconsistancy in defining the IRQ# for secondary IDE! +#endif + +#if (MICRODEV_LINUX_IRQ_IDE1 != 14) +# error Inconsistancy in defining the IRQ# for primary IDE! +#endif + +static void enable_microdev_irq(unsigned int irq); +static void disable_microdev_irq(unsigned int irq); + + /* shutdown is same as "disable" */ +#define shutdown_microdev_irq disable_microdev_irq + +static void mask_and_ack_microdev(unsigned int); +static void end_microdev_irq(unsigned int irq); + +static unsigned int startup_microdev_irq(unsigned int irq) +{ + enable_microdev_irq(irq); + return 0; /* never anything pending */ +} + +static struct hw_interrupt_type microdev_irq_type = { + "MicroDev-IRQ", + startup_microdev_irq, + shutdown_microdev_irq, + enable_microdev_irq, + disable_microdev_irq, + mask_and_ack_microdev, + end_microdev_irq +}; + +static void disable_microdev_irq(unsigned int irq) +{ + unsigned int flags; + unsigned int fpgaIrq; + + if (irq >= NUM_EXTERNAL_IRQS) return; + if (!fpgaIrqTable[irq].mapped) return; + + fpgaIrq = fpgaIrqTable[irq].fpgaIrq; + + /* disable interrupts */ + local_irq_save(flags); + + /* disable interupts on the FPGA INTC register */ + ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG); + + /* restore interrupts */ + local_irq_restore(flags); +} + +static void enable_microdev_irq(unsigned int irq) +{ + unsigned long priorityReg, priorities, pri; + unsigned int flags; + unsigned int fpgaIrq; + + + if (irq >= NUM_EXTERNAL_IRQS) return; + if (!fpgaIrqTable[irq].mapped) return; + + pri = 15 - irq; + + fpgaIrq = fpgaIrqTable[irq].fpgaIrq; + priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq); + + /* disable interrupts */ + local_irq_save(flags); + + /* set priority for the interrupt */ + priorities = ctrl_inl(priorityReg); + priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq); + priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri); + ctrl_outl(priorities, priorityReg); + + /* enable interupts on the FPGA INTC register */ + ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG); + + /* restore interrupts */ + local_irq_restore(flags); +} + + /* This functions sets the desired irq handler to be a MicroDev type */ +static void __init make_microdev_irq(unsigned int irq) +{ + disable_irq_nosync(irq); + irq_desc[irq].handler = µdev_irq_type; + disable_microdev_irq(irq); +} + +static void mask_and_ack_microdev(unsigned int irq) +{ + disable_microdev_irq(irq); +} + +static void end_microdev_irq(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) + { + enable_microdev_irq(irq); + } +} + +extern void __init init_microdev_irq(void) +{ + int i; + + /* disable interupts on the FPGA INTC register */ + ctrl_outl(~0ul, MICRODEV_FPGA_INTDSB_REG); + + for (i = 0; i < NUM_EXTERNAL_IRQS; i++) + { + make_microdev_irq(i); + } +} + +extern void microdev_print_fpga_intc_status(void) +{ + volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG; + volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG; + volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0); + volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8); + volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16); + volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24); + volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG; + volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG; + + printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n"); + printk("FPGA_INTENB = 0x%08x\n", *intenb); + printk("FPGA_INTDSB = 0x%08x\n", *intdsb); + printk("FPGA_INTSRC = 0x%08x\n", *intsrc); + printk("FPGA_INTREQ = 0x%08x\n", *intreq); + printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria); + printk("-------------------------------------------------------------------------------\n"); +} + + |