/*
* $Id: setup.c,v 1.4 2003/08/03 03:05:10 lethal Exp $
*
* Setup and IRQ handling code for the HD64465 companion chip.
* by Greg Banks <gbanks@pocketpenguins.com>
* Copyright (c) 2000 PocketPenguins Inc
*
* Derived from setup_hd64461.c which bore the message:
* Copyright (C) 2000 YAEGASHI Takeshi
*/
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hd64465/hd64465.h>
static void disable_hd64465_irq(unsigned int irq)
{
unsigned short nimr;
unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
pr_debug("disable_hd64465_irq(%d): mask=%x\n", irq, mask);
nimr = inw(HD64465_REG_NIMR);
nimr |= mask;
outw(nimr, HD64465_REG_NIMR);
}
static void enable_hd64465_irq(unsigned int irq)
{
unsigned short nimr;
unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
pr_debug("enable_hd64465_irq(%d): mask=%x\n", irq, mask);
nimr = inw(HD64465_REG_NIMR);
nimr &= ~mask;
outw(nimr, HD64465_REG_NIMR);
}
static void mask_and_ack_hd64465(unsigned int irq)
{
disable_hd64465_irq(irq);
}
static void end_hd64465_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_hd64465_irq(irq);
}
static unsigned int startup_hd64465_irq(unsigned int irq)
{
enable_hd64465_irq(irq);
return 0;
}
static void shutdown_hd64465_irq(unsigned int irq)
{
disable_hd64465_irq(irq);
}
static struct hw_interrupt_type hd64465_irq_type = {
.typename = "HD64465-IRQ",
.startup = startup_hd64465_irq,
.shutdown = shutdown_hd64465_irq,
.enable = enable_hd64465_irq,
.disable = disable_hd64465_irq,
.ack = mask_and_ack_hd64465,
.end = end_hd64465_irq,
};
static irqreturn_t hd64465_interrupt(int irq, void *dev_id)
{
printk(KERN_INFO
"HD64465: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
inw(HD64465_REG_NIRR), inw(HD64465_REG_NIMR));
return IRQ_NONE;
}
/*
* Support for a secondary IRQ demux step. This is necessary
* because the HD64465 presents a very thin interface to the
* PCMCIA bus; a lot of features (such as remapping interrupts)
* normally done in hardware by other PCMCIA host bridges is
* instead done in software.
*/
static struct {
int (*func)(int, void *);
void *dev;
} hd64465_demux[HD64465_IRQ_NUM];
void hd64465_register_irq_demux(int irq,
int (*demux)(int irq, void *dev), void *dev)
{
hd64465_demux[irq - HD64465_IRQ_BASE].func = demux;
hd64465_demux[irq - HD64465_IRQ_BASE].dev = dev;
}
EXPORT_SYMBOL(hd64465_register_irq_demux);
void hd64465_unregister_irq_demux(int irq)
{
hd64465_demux[irq - HD64465_IRQ_BASE].func = 0;
}
EXPORT_SYMBOL(hd64465_unregister_irq_demux);
int hd64465_irq_demux(int irq)
{
if (irq == CONFIG_HD64465_IRQ) {
unsigned short i, bit;
unsigned short nirr = inw(HD64465_REG_NIRR);
unsigned short nimr = inw(HD64465_REG_NIMR);
pr_debug("hd64465_irq_demux, nirr=%04x, nimr=%04x\n", nirr, nimr);
nirr &= ~nimr;
for (bit = 1, i = 0 ; i < HD64465_IRQ_NUM ; bit <<= 1, i++)
if (nirr & bit)
break;
if (i < HD64465_IRQ_NUM) {
irq = HD64465_IRQ_BASE + i;
if (hd64465_demux[i].func != 0)
irq = hd64465_demux[i].func(irq, hd64465_demux[i].dev);
}
}
return irq;
}
static struct irqaction irq0 = {
.handler = hd64465_interrupt,
.flags = IRQF_DISABLED,
.mask = CPU_MASK_NONE,
.name = "HD64465",
};
static int __init setup_hd64465(void)
{
int i;
unsigned short rev;
unsigned short smscr;
if (!MACH_HD64465)
return 0;
printk(KERN_INFO "HD64465 configured at 0x%x on irq %d(mapped into %d to %d)\n",
CONFIG_HD64465_IOBASE,
CONFIG_HD64465_IRQ,
HD64465_IRQ_BASE,
HD64465_IRQ_BASE+HD64465_IRQ_NUM-1);
if (inw(HD64465_REG_SDID) != HD64465_SDID) {
printk(KERN_ERR "HD64465 device ID not found, check base address\n");
}
rev = inw(HD64465_REG_SRR);
printk(KERN_INFO "HD64465 hardware revision %d.%d\n", (rev >> 8) & 0xff, rev & 0xff);
outw(0xffff, HD64465_REG_NIMR); /* mask all interrupts */
for (i = 0; i < HD64465_IRQ_NUM ; i++) {
irq_desc[HD64465_IRQ_BASE + i].chip = &hd64465_irq_type;
}
setup_irq(CONFIG_HD64465_IRQ, &irq0);
/* wake up the UART from STANDBY at this point */
smscr = inw(HD64465_REG_SMSCR);
outw(smscr & (~HD64465_SMSCR_UARTST), HD64465_REG_SMSCR);
/* remap IO ports for first ISA serial port to HD64465 UART */
hd64465_port_map(0x3f8, 8, CONFIG_HD64465_IOBASE + 0x8000, 1);
return 0;
}
module_init(setup_hd64465);
