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 | |
25 | static 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(asic: ctrl, local_irq: irq, irqp: &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(asic: ctrl, local_irq: irq, irqp: &dev->aux_irq); |
45 | } |
46 | |
47 | static void __init |
48 | wax_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 | |
67 | static 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(size: 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(dev: &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(objp: 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(irq: wax->gsc_irq.irq, handler: gsc_asic_intr, flags: 0, name: "wax" , dev: wax); |
98 | if (ret < 0) { |
99 | kfree(objp: 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(parent: dev, gsc_asic: wax); |
108 | if (ret) { |
109 | kfree(objp: wax); |
110 | return ret; |
111 | } |
112 | |
113 | gsc_fixup_irqs(parent: dev, ctrl: wax, choose: 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, ctrl: wax, choose: wax_choose_irq); |
118 | } |
119 | |
120 | return ret; |
121 | } |
122 | |
123 | static const struct parisc_device_id wax_tbl[] __initconst = { |
124 | { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e }, |
125 | { 0, } |
126 | }; |
127 | |
128 | MODULE_DEVICE_TABLE(parisc, wax_tbl); |
129 | |
130 | static struct parisc_driver wax_driver __refdata = { |
131 | .name = "wax" , |
132 | .id_table = wax_tbl, |
133 | .probe = wax_init_chip, |
134 | }; |
135 | |
136 | static int __init wax_init(void) |
137 | { |
138 | return register_parisc_driver(&wax_driver); |
139 | } |
140 | arch_initcall(wax_init); |
141 | |