mirror of https://gitee.com/openkylin/linux.git
200 lines
5.1 KiB
C
200 lines
5.1 KiB
C
/* -------------------------------------------------------------------- */
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/* setup_voyagergx.c: */
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/* -------------------------------------------------------------------- */
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/* This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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Copyright 2003 (c) Lineo uSolutions,Inc.
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*/
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/* -------------------------------------------------------------------- */
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#undef DEBUG
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/rts7751r2d/rts7751r2d.h>
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#include <asm/rts7751r2d/voyagergx_reg.h>
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static void disable_voyagergx_irq(unsigned int irq)
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{
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unsigned long flags, val;
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unsigned long mask = 1 << (irq - VOYAGER_IRQ_BASE);
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pr_debug("disable_voyagergx_irq(%d): mask=%x\n", irq, mask);
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local_irq_save(flags);
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val = inl(VOYAGER_INT_MASK);
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val &= ~mask;
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outl(val, VOYAGER_INT_MASK);
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local_irq_restore(flags);
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}
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static void enable_voyagergx_irq(unsigned int irq)
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{
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unsigned long flags, val;
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unsigned long mask = 1 << (irq - VOYAGER_IRQ_BASE);
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pr_debug("disable_voyagergx_irq(%d): mask=%x\n", irq, mask);
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local_irq_save(flags);
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val = inl(VOYAGER_INT_MASK);
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val |= mask;
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outl(val, VOYAGER_INT_MASK);
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local_irq_restore(flags);
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}
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static void mask_and_ack_voyagergx(unsigned int irq)
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{
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disable_voyagergx_irq(irq);
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}
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static void end_voyagergx_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_voyagergx_irq(irq);
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}
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static unsigned int startup_voyagergx_irq(unsigned int irq)
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{
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enable_voyagergx_irq(irq);
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return 0;
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}
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static void shutdown_voyagergx_irq(unsigned int irq)
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{
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disable_voyagergx_irq(irq);
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}
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static struct hw_interrupt_type voyagergx_irq_type = {
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.typename = "VOYAGERGX-IRQ",
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.startup = startup_voyagergx_irq,
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.shutdown = shutdown_voyagergx_irq,
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.enable = enable_voyagergx_irq,
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.disable = disable_voyagergx_irq,
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.ack = mask_and_ack_voyagergx,
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.end = end_voyagergx_irq,
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};
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static irqreturn_t voyagergx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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printk(KERN_INFO
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"VoyagerGX: spurious interrupt, status: 0x%x\n",
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inl(INT_STATUS));
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return IRQ_HANDLED;
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}
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/*====================================================*/
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static struct {
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int (*func)(int, void *);
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void *dev;
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} voyagergx_demux[VOYAGER_IRQ_NUM];
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void voyagergx_register_irq_demux(int irq,
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int (*demux)(int irq, void *dev), void *dev)
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{
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voyagergx_demux[irq - VOYAGER_IRQ_BASE].func = demux;
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voyagergx_demux[irq - VOYAGER_IRQ_BASE].dev = dev;
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}
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void voyagergx_unregister_irq_demux(int irq)
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{
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voyagergx_demux[irq - VOYAGER_IRQ_BASE].func = 0;
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}
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int voyagergx_irq_demux(int irq)
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{
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if (irq == IRQ_VOYAGER ) {
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unsigned long i = 0, bit __attribute__ ((unused));
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unsigned long val = inl(INT_STATUS);
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#if 1
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if ( val & ( 1 << 1 )){
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i = 1;
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} else if ( val & ( 1 << 2 )){
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i = 2;
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} else if ( val & ( 1 << 6 )){
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i = 6;
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} else if( val & ( 1 << 10 )){
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i = 10;
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} else if( val & ( 1 << 11 )){
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i = 11;
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} else if( val & ( 1 << 12 )){
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i = 12;
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} else if( val & ( 1 << 17 )){
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i = 17;
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} else {
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printk("Unexpected IRQ irq = %d status = 0x%08lx\n", irq, val);
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}
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pr_debug("voyagergx_irq_demux %d \n", i);
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#else
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for (bit = 1, i = 0 ; i < VOYAGER_IRQ_NUM ; bit <<= 1, i++)
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if (val & bit)
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break;
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#endif
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if (i < VOYAGER_IRQ_NUM) {
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irq = VOYAGER_IRQ_BASE + i;
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if (voyagergx_demux[i].func != 0)
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irq = voyagergx_demux[i].func(irq, voyagergx_demux[i].dev);
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}
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}
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return irq;
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}
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static struct irqaction irq0 = {
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.name = "voyagergx",
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.handler = voyagergx_interrupt,
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.flags = SA_INTERRUPT,
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.mask = CPU_MASK_NONE,
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};
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void __init setup_voyagergx_irq(void)
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{
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int i, flag;
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printk(KERN_INFO "VoyagerGX configured at 0x%x on irq %d(mapped into %d to %d)\n",
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VOYAGER_BASE,
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IRQ_VOYAGER,
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VOYAGER_IRQ_BASE,
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VOYAGER_IRQ_BASE + VOYAGER_IRQ_NUM - 1);
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for (i=0; i<VOYAGER_IRQ_NUM; i++) {
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flag = 0;
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switch (VOYAGER_IRQ_BASE + i) {
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case VOYAGER_USBH_IRQ:
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case VOYAGER_8051_IRQ:
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case VOYAGER_UART0_IRQ:
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case VOYAGER_UART1_IRQ:
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case VOYAGER_AC97_IRQ:
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flag = 1;
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}
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if (flag == 1)
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irq_desc[VOYAGER_IRQ_BASE + i].handler = &voyagergx_irq_type;
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}
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setup_irq(IRQ_VOYAGER, &irq0);
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}
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