1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * ip22-hpc.c: Routines for generic manipulation of the HPC controllers.
4  *
5  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
6  * Copyright (C) 1998 Ralf Baechle
7  */
8 
9 #include <linux/export.h>
10 #include <linux/init.h>
11 #include <linux/types.h>
12 
13 #include <asm/io.h>
14 #include <asm/sgi/hpc3.h>
15 #include <asm/sgi/ioc.h>
16 #include <asm/sgi/ip22.h>
17 
18 struct hpc3_regs *hpc3c0, *hpc3c1;
19 
20 EXPORT_SYMBOL(hpc3c0);
21 EXPORT_SYMBOL(hpc3c1);
22 
23 struct sgioc_regs *sgioc;
24 
25 EXPORT_SYMBOL(sgioc);
26 
27 /* We need software copies of these because they are write only. */
28 u8 sgi_ioc_reset, sgi_ioc_write;
29 
30 extern char *system_type;
31 
sgihpc_init(void)32 void __init sgihpc_init(void)
33 {
34 	/* ioremap can't fail */
35 	hpc3c0 = (struct hpc3_regs *)
36 		 ioremap(HPC3_CHIP0_BASE, sizeof(struct hpc3_regs));
37 	hpc3c1 = (struct hpc3_regs *)
38 		 ioremap(HPC3_CHIP1_BASE, sizeof(struct hpc3_regs));
39 	/* IOC lives in PBUS PIO channel 6 */
40 	sgioc = (struct sgioc_regs *)hpc3c0->pbus_extregs[6];
41 
42 	hpc3c0->pbus_piocfg[6][0] |= HPC3_PIOCFG_DS16;
43 	if (ip22_is_fullhouse()) {
44 		/* Full House comes with INT2 which lives in PBUS PIO
45 		 * channel 4 */
46 		sgint = (struct sgint_regs *)hpc3c0->pbus_extregs[4];
47 		system_type = "SGI Indigo2";
48 	} else {
49 		/* Guiness comes with INT3 which is part of IOC */
50 		sgint = &sgioc->int3;
51 		system_type = "SGI Indy";
52 	}
53 
54 	sgi_ioc_reset = (SGIOC_RESET_PPORT | SGIOC_RESET_KBDMOUSE |
55 			 SGIOC_RESET_EISA | SGIOC_RESET_ISDN |
56 			 SGIOC_RESET_LC0OFF);
57 
58 	sgi_ioc_write = (SGIOC_WRITE_EASEL | SGIOC_WRITE_NTHRESH |
59 			 SGIOC_WRITE_TPSPEED | SGIOC_WRITE_EPSEL |
60 			 SGIOC_WRITE_U0AMODE | SGIOC_WRITE_U1AMODE);
61 
62 	sgioc->reset = sgi_ioc_reset;
63 	sgioc->write = sgi_ioc_write;
64 }
65