1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *	WAX Device Driver
4 *
5 *	(c) Copyright 2000 The Puffin Group Inc.
6 *
7 *	(c) 2000-2023 by Helge Deller <deller@gmx.de>
8 */
9
10#include <linux/errno.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/ioport.h>
14#include <linux/slab.h>
15#include <linux/module.h>
16#include <linux/types.h>
17
18#include <asm/io.h>
19#include <asm/hardware.h>
20
21#include "gsc.h"
22
23#define WAX_GSC_IRQ	7	/* Hardcoded Interrupt for GSC */
24
25static void wax_choose_irq(struct parisc_device *dev, void *ctrl)
26{
27	int irq;
28
29	switch (dev->id.sversion) {
30		case 0x73:	irq =  1; break; /* i8042 General */
31		case 0x8c:	irq =  6; break; /* Serial */
32		case 0x90:	irq = 10; break; /* EISA */
33		default:	return;		 /* Unknown */
34	}
35
36	gsc_asic_assign_irq(ctrl, irq, &dev->irq);
37
38	switch (dev->id.sversion) {
39		case 0x73:	irq =  2; break; /* i8042 High-priority */
40		case 0x90:	irq =  0; break; /* EISA NMI */
41		default:	return;		 /* No secondary IRQ */
42	}
43
44	gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
45}
46
47static void __init
48wax_init_irq(struct gsc_asic *wax)
49{
50	unsigned long base = wax->hpa;
51
52	/* Wax-off */
53	gsc_writel(0x00000000, base+OFFSET_IMR);
54
55	/* clear pending interrupts */
56	gsc_readl(base+OFFSET_IRR);
57
58	/* We're not really convinced we want to reset the onboard
59         * devices. Firmware does it for us...
60	 */
61
62	/* Resets */
63//	gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
64//	gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
65}
66
67static int __init wax_init_chip(struct parisc_device *dev)
68{
69	struct gsc_asic *wax;
70	struct parisc_device *parent;
71	int ret;
72
73	wax = kzalloc(sizeof(*wax), GFP_KERNEL);
74	if (!wax)
75		return -ENOMEM;
76
77	wax->name = "wax";
78	wax->hpa = dev->hpa.start;
79
80	wax->version = 0;   /* gsc_readb(wax->hpa+WAX_VER); */
81	printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);
82
83	/* Stop wax hissing for a bit */
84	wax_init_irq(wax);
85
86	/* the IRQ wax should use */
87	dev->irq = gsc_claim_irq(&wax->gsc_irq, WAX_GSC_IRQ);
88	if (dev->irq < 0) {
89		printk(KERN_ERR "%s(): cannot get GSC irq\n",
90				__func__);
91		kfree(wax);
92		return -EBUSY;
93	}
94
95	wax->eim = ((u32) wax->gsc_irq.txn_addr) | wax->gsc_irq.txn_data;
96
97	ret = request_irq(wax->gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);
98	if (ret < 0) {
99		kfree(wax);
100		return ret;
101	}
102
103	/* enable IRQ's for devices below WAX */
104	gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);
105
106	/* Done init'ing, register this driver */
107	ret = gsc_common_setup(dev, wax);
108	if (ret) {
109		kfree(wax);
110		return ret;
111	}
112
113	gsc_fixup_irqs(dev, wax, wax_choose_irq);
114	/* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
115	parent = parisc_parent(dev);
116	if (parent->id.hw_type != HPHW_IOA) {
117		gsc_fixup_irqs(parent, wax, wax_choose_irq);
118	}
119
120	return ret;
121}
122
123static const struct parisc_device_id wax_tbl[] __initconst = {
124	{ HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
125	{ 0, }
126};
127
128MODULE_DEVICE_TABLE(parisc, wax_tbl);
129
130static struct parisc_driver wax_driver __refdata = {
131	.name =		"wax",
132	.id_table =	wax_tbl,
133	.probe =	wax_init_chip,
134};
135
136static int __init wax_init(void)
137{
138	return register_parisc_driver(&wax_driver);
139}
140arch_initcall(wax_init);
141