1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * WAX Device Driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * (c) Copyright 2000 The Puffin Group Inc.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * by Helge Deller <deller@gmx.de>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/errno.h>
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun #include <linux/interrupt.h>
13*4882a593Smuzhiyun #include <linux/ioport.h>
14*4882a593Smuzhiyun #include <linux/slab.h>
15*4882a593Smuzhiyun #include <linux/module.h>
16*4882a593Smuzhiyun #include <linux/types.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include <asm/io.h>
19*4882a593Smuzhiyun #include <asm/hardware.h>
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include "gsc.h"
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun #define WAX_GSC_IRQ 7 /* Hardcoded Interrupt for GSC */
24*4882a593Smuzhiyun
wax_choose_irq(struct parisc_device * dev,void * ctrl)25*4882a593Smuzhiyun static void wax_choose_irq(struct parisc_device *dev, void *ctrl)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun int irq;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun switch (dev->id.sversion) {
30*4882a593Smuzhiyun case 0x73: irq = 1; break; /* i8042 General */
31*4882a593Smuzhiyun case 0x8c: irq = 6; break; /* Serial */
32*4882a593Smuzhiyun case 0x90: irq = 10; break; /* EISA */
33*4882a593Smuzhiyun default: return; /* Unknown */
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun gsc_asic_assign_irq(ctrl, irq, &dev->irq);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun switch (dev->id.sversion) {
39*4882a593Smuzhiyun case 0x73: irq = 2; break; /* i8042 High-priority */
40*4882a593Smuzhiyun case 0x90: irq = 0; break; /* EISA NMI */
41*4882a593Smuzhiyun default: return; /* No secondary IRQ */
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun static void __init
wax_init_irq(struct gsc_asic * wax)48*4882a593Smuzhiyun wax_init_irq(struct gsc_asic *wax)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun unsigned long base = wax->hpa;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun /* Wax-off */
53*4882a593Smuzhiyun gsc_writel(0x00000000, base+OFFSET_IMR);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun /* clear pending interrupts */
56*4882a593Smuzhiyun gsc_readl(base+OFFSET_IRR);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun /* We're not really convinced we want to reset the onboard
59*4882a593Smuzhiyun * devices. Firmware does it for us...
60*4882a593Smuzhiyun */
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun /* Resets */
63*4882a593Smuzhiyun // gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
64*4882a593Smuzhiyun // gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
wax_init_chip(struct parisc_device * dev)67*4882a593Smuzhiyun static int __init wax_init_chip(struct parisc_device *dev)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun struct gsc_asic *wax;
70*4882a593Smuzhiyun struct parisc_device *parent;
71*4882a593Smuzhiyun int ret;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun wax = kzalloc(sizeof(*wax), GFP_KERNEL);
74*4882a593Smuzhiyun if (!wax)
75*4882a593Smuzhiyun return -ENOMEM;
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun wax->name = "wax";
78*4882a593Smuzhiyun wax->hpa = dev->hpa.start;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun wax->version = 0; /* gsc_readb(wax->hpa+WAX_VER); */
81*4882a593Smuzhiyun printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun /* Stop wax hissing for a bit */
84*4882a593Smuzhiyun wax_init_irq(wax);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun /* the IRQ wax should use */
87*4882a593Smuzhiyun dev->irq = gsc_claim_irq(&wax->gsc_irq, WAX_GSC_IRQ);
88*4882a593Smuzhiyun if (dev->irq < 0) {
89*4882a593Smuzhiyun printk(KERN_ERR "%s(): cannot get GSC irq\n",
90*4882a593Smuzhiyun __func__);
91*4882a593Smuzhiyun kfree(wax);
92*4882a593Smuzhiyun return -EBUSY;
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun wax->eim = ((u32) wax->gsc_irq.txn_addr) | wax->gsc_irq.txn_data;
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun ret = request_irq(wax->gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);
98*4882a593Smuzhiyun if (ret < 0) {
99*4882a593Smuzhiyun kfree(wax);
100*4882a593Smuzhiyun return ret;
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun /* enable IRQ's for devices below WAX */
104*4882a593Smuzhiyun gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun /* Done init'ing, register this driver */
107*4882a593Smuzhiyun ret = gsc_common_setup(dev, wax);
108*4882a593Smuzhiyun if (ret) {
109*4882a593Smuzhiyun kfree(wax);
110*4882a593Smuzhiyun return ret;
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun gsc_fixup_irqs(dev, wax, wax_choose_irq);
114*4882a593Smuzhiyun /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
115*4882a593Smuzhiyun parent = parisc_parent(dev);
116*4882a593Smuzhiyun if (parent->id.hw_type != HPHW_IOA) {
117*4882a593Smuzhiyun gsc_fixup_irqs(parent, wax, wax_choose_irq);
118*4882a593Smuzhiyun }
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun return ret;
121*4882a593Smuzhiyun }
122*4882a593Smuzhiyun
123*4882a593Smuzhiyun static const struct parisc_device_id wax_tbl[] __initconst = {
124*4882a593Smuzhiyun { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
125*4882a593Smuzhiyun { 0, }
126*4882a593Smuzhiyun };
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun MODULE_DEVICE_TABLE(parisc, wax_tbl);
129*4882a593Smuzhiyun
130*4882a593Smuzhiyun struct parisc_driver wax_driver __refdata = {
131*4882a593Smuzhiyun .name = "wax",
132*4882a593Smuzhiyun .id_table = wax_tbl,
133*4882a593Smuzhiyun .probe = wax_init_chip,
134*4882a593Smuzhiyun };
135