158 lines
3.4 KiB
C
158 lines
3.4 KiB
C
/*
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* arch/sh/mach-cayman/irq.c - SH-5 Cayman Interrupt Support
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*
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* This file handles the board specific parts of the Cayman interrupt system
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*
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* Copyright (C) 2002 Stuart Menefy
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/signal.h>
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#include <cpu/irq.h>
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#include <asm/page.h>
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/* Setup for the SMSC FDC37C935 / LAN91C100FD */
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#define SMSC_IRQ IRQ_IRL1
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/* Setup for PCI Bus 2, which transmits interrupts via the EPLD */
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#define PCI2_IRQ IRQ_IRL3
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unsigned long epld_virt;
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#define EPLD_BASE 0x04002000
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#define EPLD_STATUS_BASE (epld_virt + 0x10)
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#define EPLD_MASK_BASE (epld_virt + 0x20)
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/* Note the SMSC SuperIO chip and SMSC LAN chip interrupts are all muxed onto
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the same SH-5 interrupt */
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static irqreturn_t cayman_interrupt_smsc(int irq, void *dev_id)
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{
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printk(KERN_INFO "CAYMAN: spurious SMSC interrupt\n");
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return IRQ_NONE;
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}
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static irqreturn_t cayman_interrupt_pci2(int irq, void *dev_id)
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{
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printk(KERN_INFO "CAYMAN: spurious PCI interrupt, IRQ %d\n", irq);
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return IRQ_NONE;
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}
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static struct irqaction cayman_action_smsc = {
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.name = "Cayman SMSC Mux",
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.handler = cayman_interrupt_smsc,
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};
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static struct irqaction cayman_action_pci2 = {
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.name = "Cayman PCI2 Mux",
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.handler = cayman_interrupt_pci2,
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};
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static void enable_cayman_irq(struct irq_data *data)
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{
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unsigned int irq = data->irq;
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unsigned long flags;
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unsigned long mask;
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unsigned int reg;
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unsigned char bit;
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irq -= START_EXT_IRQS;
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reg = EPLD_MASK_BASE + ((irq / 8) << 2);
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bit = 1<<(irq % 8);
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local_irq_save(flags);
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mask = __raw_readl(reg);
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mask |= bit;
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__raw_writel(mask, reg);
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local_irq_restore(flags);
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}
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static void disable_cayman_irq(struct irq_data *data)
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{
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unsigned int irq = data->irq;
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unsigned long flags;
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unsigned long mask;
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unsigned int reg;
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unsigned char bit;
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irq -= START_EXT_IRQS;
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reg = EPLD_MASK_BASE + ((irq / 8) << 2);
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bit = 1<<(irq % 8);
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local_irq_save(flags);
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mask = __raw_readl(reg);
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mask &= ~bit;
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__raw_writel(mask, reg);
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local_irq_restore(flags);
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}
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struct irq_chip cayman_irq_type = {
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.name = "Cayman-IRQ",
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.irq_unmask = enable_cayman_irq,
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.irq_mask = disable_cayman_irq,
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};
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int cayman_irq_demux(int evt)
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{
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int irq = intc_evt_to_irq[evt];
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if (irq == SMSC_IRQ) {
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unsigned long status;
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int i;
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status = __raw_readl(EPLD_STATUS_BASE) &
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__raw_readl(EPLD_MASK_BASE) & 0xff;
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if (status == 0) {
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irq = -1;
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} else {
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for (i=0; i<8; i++) {
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if (status & (1<<i))
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break;
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}
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irq = START_EXT_IRQS + i;
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}
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}
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if (irq == PCI2_IRQ) {
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unsigned long status;
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int i;
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status = __raw_readl(EPLD_STATUS_BASE + 3 * sizeof(u32)) &
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__raw_readl(EPLD_MASK_BASE + 3 * sizeof(u32)) & 0xff;
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if (status == 0) {
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irq = -1;
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} else {
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for (i=0; i<8; i++) {
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if (status & (1<<i))
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break;
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}
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irq = START_EXT_IRQS + (3 * 8) + i;
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}
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}
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return irq;
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}
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void init_cayman_irq(void)
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{
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int i;
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epld_virt = (unsigned long)ioremap_nocache(EPLD_BASE, 1024);
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if (!epld_virt) {
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printk(KERN_ERR "Cayman IRQ: Unable to remap EPLD\n");
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return;
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}
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for (i = 0; i < NR_EXT_IRQS; i++) {
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irq_set_chip_and_handler(START_EXT_IRQS + i,
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&cayman_irq_type, handle_level_irq);
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}
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/* Setup the SMSC interrupt */
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setup_irq(SMSC_IRQ, &cayman_action_smsc);
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setup_irq(PCI2_IRQ, &cayman_action_pci2);
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}
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