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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* WAX Device Driver
*
* (c) Copyright 2000 The Puffin Group Inc.
*
* (c) 2000-2023 by Helge Deller <deller@gmx.de>
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include "gsc.h"
#define WAX_GSC_IRQ 7 /* Hardcoded Interrupt for GSC */
static void wax_choose_irq(struct parisc_device *dev, void *ctrl)
{
int irq;
switch (dev->id.sversion) {
case 0x73: irq = 1; break; /* i8042 General */
case 0x8c: irq = 6; break; /* Serial */
case 0x90: irq = 10; break; /* EISA */
default: return; /* Unknown */
}
gsc_asic_assign_irq(ctrl, irq, &dev->irq);
switch (dev->id.sversion) {
case 0x73: irq = 2; break; /* i8042 High-priority */
case 0x90: irq = 0; break; /* EISA NMI */
default: return; /* No secondary IRQ */
}
gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
}
static void __init
wax_init_irq(struct gsc_asic *wax)
{
unsigned long base = wax->hpa;
/* Wax-off */
gsc_writel(0x00000000, base+OFFSET_IMR);
/* clear pending interrupts */
gsc_readl(base+OFFSET_IRR);
/* We're not really convinced we want to reset the onboard
* devices. Firmware does it for us...
*/
/* Resets */
// gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
// gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
}
static int __init wax_init_chip(struct parisc_device *dev)
{
struct gsc_asic *wax;
struct parisc_device *parent;
int ret;
wax = kzalloc(sizeof(*wax), GFP_KERNEL);
if (!wax)
return -ENOMEM;
wax->name = "wax";
wax->hpa = dev->hpa.start;
wax->version = 0; /* gsc_readb(wax->hpa+WAX_VER); */
printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);
/* Stop wax hissing for a bit */
wax_init_irq(wax);
/* the IRQ wax should use */
dev->irq = gsc_claim_irq(&wax->gsc_irq, WAX_GSC_IRQ);
if (dev->irq < 0) {
printk(KERN_ERR "%s(): cannot get GSC irq\n",
__func__);
kfree(wax);
return -EBUSY;
}
wax->eim = ((u32) wax->gsc_irq.txn_addr) | wax->gsc_irq.txn_data;
ret = request_irq(wax->gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);
if (ret < 0) {
kfree(wax);
return ret;
}
/* enable IRQ's for devices below WAX */
gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);
/* Done init'ing, register this driver */
ret = gsc_common_setup(dev, wax);
if (ret) {
kfree(wax);
return ret;
}
gsc_fixup_irqs(dev, wax, wax_choose_irq);
/* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
parent = parisc_parent(dev);
if (parent->id.hw_type != HPHW_IOA) {
gsc_fixup_irqs(parent, wax, wax_choose_irq);
}
return ret;
}
static const struct parisc_device_id wax_tbl[] __initconst = {
{ HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
{ 0, }
};
MODULE_DEVICE_TABLE(parisc, wax_tbl);
static struct parisc_driver wax_driver __refdata = {
.name = "wax",
.id_table = wax_tbl,
.probe = wax_init_chip,
};
static int __init wax_init(void)
{
return register_parisc_driver(&wax_driver);
}
arch_initcall(wax_init);
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