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