Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / arch / mips / lantiq / falcon / prom.c
1 /*
2  * This program is free software; you can redistribute it and/or modify it
3  * under the terms of the GNU General Public License version 2 as published
4  * by the Free Software Foundation.
5  *
6  * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
7  * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
8  */
9
10 #include <linux/kernel.h>
11 #include <asm/cacheflush.h>
12 #include <asm/traps.h>
13 #include <asm/io.h>
14
15 #include <lantiq_soc.h>
16
17 #include "../prom.h"
18
19 #define SOC_FALCON      "Falcon"
20 #define SOC_FALCON_D    "Falcon-D"
21 #define SOC_FALCON_V    "Falcon-V"
22 #define SOC_FALCON_M    "Falcon-M"
23
24 #define COMP_FALCON     "lantiq,falcon"
25
26 #define PART_SHIFT      12
27 #define PART_MASK       0x0FFFF000
28 #define REV_SHIFT       28
29 #define REV_MASK        0xF0000000
30 #define SREV_SHIFT      22
31 #define SREV_MASK       0x03C00000
32 #define TYPE_SHIFT      26
33 #define TYPE_MASK       0x3C000000
34
35 /* reset, nmi and ejtag exception vectors */
36 #define BOOT_REG_BASE   (KSEG1 | 0x1F200000)
37 #define BOOT_RVEC       (BOOT_REG_BASE | 0x00)
38 #define BOOT_NVEC       (BOOT_REG_BASE | 0x04)
39 #define BOOT_EVEC       (BOOT_REG_BASE | 0x08)
40
41 void __init ltq_soc_nmi_setup(void)
42 {
43         extern void (*nmi_handler)(void);
44
45         ltq_w32((unsigned long)&nmi_handler, (void *)BOOT_NVEC);
46 }
47
48 void __init ltq_soc_ejtag_setup(void)
49 {
50         extern void (*ejtag_debug_handler)(void);
51
52         ltq_w32((unsigned long)&ejtag_debug_handler, (void *)BOOT_EVEC);
53 }
54
55 void __init ltq_soc_detect(struct ltq_soc_info *i)
56 {
57         u32 type;
58         i->partnum = (ltq_r32(FALCON_CHIPID) & PART_MASK) >> PART_SHIFT;
59         i->rev = (ltq_r32(FALCON_CHIPID) & REV_MASK) >> REV_SHIFT;
60         i->srev = ((ltq_r32(FALCON_CHIPCONF) & SREV_MASK) >> SREV_SHIFT);
61         i->compatible = COMP_FALCON;
62         i->type = SOC_TYPE_FALCON;
63         sprintf(i->rev_type, "%c%d%d", (i->srev & 0x4) ? ('B') : ('A'),
64                 i->rev & 0x7, (i->srev & 0x3) + 1);
65
66         switch (i->partnum) {
67         case SOC_ID_FALCON:
68                 type = (ltq_r32(FALCON_CHIPTYPE) & TYPE_MASK) >> TYPE_SHIFT;
69                 switch (type) {
70                 case 0:
71                         i->name = SOC_FALCON_D;
72                         break;
73                 case 1:
74                         i->name = SOC_FALCON_V;
75                         break;
76                 case 2:
77                         i->name = SOC_FALCON_M;
78                         break;
79                 default:
80                         i->name = SOC_FALCON;
81                         break;
82                 }
83                 break;
84
85         default:
86                 unreachable();
87                 break;
88         }
89
90         board_nmi_handler_setup = ltq_soc_nmi_setup;
91         board_ejtag_handler_setup = ltq_soc_ejtag_setup;
92 }