xref: /openbmc/linux/drivers/parisc/asp.c (revision ff0e833e)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *	ASP 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/module.h>
14 #include <linux/types.h>
15 #include <asm/io.h>
16 #include <asm/led.h>
17 
18 #include "gsc.h"
19 
20 #define ASP_GSC_IRQ	3		/* hardcoded interrupt for GSC */
21 
22 #define ASP_VER_OFFSET 	0x20		/* offset of ASP version */
23 
24 #define ASP_LED_ADDR	0xf0800020
25 
26 #define VIPER_INT_WORD  0xFFFBF088      /* addr of viper interrupt word */
27 
28 static struct gsc_asic asp;
29 
asp_choose_irq(struct parisc_device * dev,void * ctrl)30 static void asp_choose_irq(struct parisc_device *dev, void *ctrl)
31 {
32 	int irq;
33 
34 	switch (dev->id.sversion) {
35 	case 0x71:	irq =  9; break; /* SCSI */
36 	case 0x72:	irq =  8; break; /* LAN */
37 	case 0x73:	irq =  1; break; /* HIL */
38 	case 0x74:	irq =  7; break; /* Centronics */
39 	case 0x75:	irq = (dev->hw_path == 4) ? 5 : 6; break; /* RS232 */
40 	case 0x76:	irq = 10; break; /* EISA BA */
41 	case 0x77:	irq = 11; break; /* Graphics1 */
42 	case 0x7a:	irq = 13; break; /* Audio (Bushmaster) */
43 	case 0x7b:	irq = 13; break; /* Audio (Scorpio) */
44 	case 0x7c:	irq =  3; break; /* FW SCSI */
45 	case 0x7d:	irq =  4; break; /* FDDI */
46 	case 0x7f:	irq = 13; break; /* Audio (Outfield) */
47 	default:	return;		 /* Unknown */
48 	}
49 
50 	gsc_asic_assign_irq(ctrl, irq, &dev->irq);
51 
52 	switch (dev->id.sversion) {
53 	case 0x73:	irq =  2; break; /* i8042 High-priority */
54 	case 0x76:	irq =  0; break; /* EISA BA */
55 	default:	return;		 /* Other */
56 	}
57 
58 	gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
59 }
60 
61 /* There are two register ranges we're interested in.  Interrupt /
62  * Status / LED are at 0xf080xxxx and Asp special registers are at
63  * 0xf082fxxx.  PDC only tells us that Asp is at 0xf082f000, so for
64  * the purposes of interrupt handling, we have to tell other bits of
65  * the kernel to look at the other registers.
66  */
67 #define ASP_INTERRUPT_ADDR 0xf0800000
68 
asp_init_chip(struct parisc_device * dev)69 static int __init asp_init_chip(struct parisc_device *dev)
70 {
71 	struct gsc_irq gsc_irq;
72 	int ret;
73 
74 	asp.version = gsc_readb(dev->hpa.start + ASP_VER_OFFSET) & 0xf;
75 	asp.name = (asp.version == 1) ? "Asp" : "Cutoff";
76 	asp.hpa = ASP_INTERRUPT_ADDR;
77 
78 	printk(KERN_INFO "%s version %d at 0x%lx found.\n",
79 		asp.name, asp.version, (unsigned long)dev->hpa.start);
80 
81 	/* the IRQ ASP should use */
82 	ret = -EBUSY;
83 	dev->irq = gsc_claim_irq(&gsc_irq, ASP_GSC_IRQ);
84 	if (dev->irq < 0) {
85 		printk(KERN_ERR "%s(): cannot get GSC irq\n", __func__);
86 		goto out;
87 	}
88 
89 	asp.eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
90 
91 	ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "asp", &asp);
92 	if (ret < 0)
93 		goto out;
94 
95 	/* Program VIPER to interrupt on the ASP irq */
96 	gsc_writel((1 << (31 - ASP_GSC_IRQ)),VIPER_INT_WORD);
97 
98 	/* Done init'ing, register this driver */
99 	ret = gsc_common_setup(dev, &asp);
100 	if (ret)
101 		goto out;
102 
103 	gsc_fixup_irqs(dev, &asp, asp_choose_irq);
104 	/* Mongoose is a sibling of Asp, not a child... */
105 	gsc_fixup_irqs(parisc_parent(dev), &asp, asp_choose_irq);
106 
107 	/* initialize the chassis LEDs */
108 #ifdef CONFIG_CHASSIS_LCD_LED
109 	register_led_driver(DISPLAY_MODEL_OLD_ASP, LED_CMD_REG_NONE,
110 		    ASP_LED_ADDR);
111 #endif
112 
113  out:
114 	return ret;
115 }
116 
117 static const struct parisc_device_id asp_tbl[] __initconst = {
118 	{ HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00070 },
119 	{ 0, }
120 };
121 MODULE_DEVICE_TABLE(parisc, asp_tbl);
122 
123 static struct parisc_driver asp_driver __refdata = {
124 	.name =		"asp",
125 	.id_table =	asp_tbl,
126 	.probe =	asp_init_chip,
127 };
128 
asp_init(void)129 static int __init asp_init(void)
130 {
131 	return register_parisc_driver(&asp_driver);
132 }
133 arch_initcall(asp_init);
134