1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * |
4 | * Parts of this file are based on Ralink's 2.6.21 BSP |
5 | * |
6 | * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org> |
7 | * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> |
8 | * Copyright (C) 2013 John Crispin <john@phrozen.org> |
9 | */ |
10 | |
11 | #include <linux/kernel.h> |
12 | #include <linux/init.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/sys_soc.h> |
15 | |
16 | #include <asm/mipsregs.h> |
17 | #include <asm/mach-ralink/ralink_regs.h> |
18 | #include <asm/mach-ralink/rt288x.h> |
19 | |
20 | #include "common.h" |
21 | |
22 | static struct ralink_soc_info *soc_info_ptr; |
23 | |
24 | static unsigned int __init rt2880_get_soc_name0(void) |
25 | { |
26 | return __raw_readl(RT2880_SYSC_BASE + SYSC_REG_CHIP_NAME0); |
27 | } |
28 | |
29 | static unsigned int __init rt2880_get_soc_name1(void) |
30 | { |
31 | return __raw_readl(RT2880_SYSC_BASE + SYSC_REG_CHIP_NAME1); |
32 | } |
33 | |
34 | static bool __init rt2880_soc_valid(void) |
35 | { |
36 | if (rt2880_get_soc_name0() == RT2880_CHIP_NAME0 && |
37 | rt2880_get_soc_name1() == RT2880_CHIP_NAME1) |
38 | return true; |
39 | else |
40 | return false; |
41 | } |
42 | |
43 | static const char __init *rt2880_get_soc_name(void) |
44 | { |
45 | if (rt2880_soc_valid()) |
46 | return "RT2880" ; |
47 | else |
48 | return "invalid" ; |
49 | } |
50 | |
51 | static unsigned int __init rt2880_get_soc_id(void) |
52 | { |
53 | return __raw_readl(RT2880_SYSC_BASE + SYSC_REG_CHIP_ID); |
54 | } |
55 | |
56 | static unsigned int __init rt2880_get_soc_ver(void) |
57 | { |
58 | return (rt2880_get_soc_id() >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK; |
59 | } |
60 | |
61 | static unsigned int __init rt2880_get_soc_rev(void) |
62 | { |
63 | return (rt2880_get_soc_id() & CHIP_ID_REV_MASK); |
64 | } |
65 | |
66 | static int __init rt2880_soc_dev_init(void) |
67 | { |
68 | struct soc_device *soc_dev; |
69 | struct soc_device_attribute *soc_dev_attr; |
70 | |
71 | soc_dev_attr = kzalloc(size: sizeof(*soc_dev_attr), GFP_KERNEL); |
72 | if (!soc_dev_attr) |
73 | return -ENOMEM; |
74 | |
75 | soc_dev_attr->family = "Ralink" ; |
76 | soc_dev_attr->soc_id = rt2880_get_soc_name(); |
77 | |
78 | soc_dev_attr->data = soc_info_ptr; |
79 | |
80 | soc_dev = soc_device_register(soc_plat_dev_attr: soc_dev_attr); |
81 | if (IS_ERR(ptr: soc_dev)) { |
82 | kfree(objp: soc_dev_attr); |
83 | return PTR_ERR(ptr: soc_dev); |
84 | } |
85 | |
86 | return 0; |
87 | } |
88 | device_initcall(rt2880_soc_dev_init); |
89 | |
90 | void __init prom_soc_init(struct ralink_soc_info *soc_info) |
91 | { |
92 | if (rt2880_soc_valid()) |
93 | soc_info->compatible = "ralink,r2880-soc" ; |
94 | else |
95 | panic(fmt: "rt288x: unknown SoC, n0:%08x n1:%08x" , |
96 | rt2880_get_soc_name0(), rt2880_get_soc_name1()); |
97 | |
98 | snprintf(buf: soc_info->sys_type, RAMIPS_SYS_TYPE_LEN, |
99 | fmt: "Ralink %s id:%u rev:%u" , |
100 | rt2880_get_soc_name(), |
101 | rt2880_get_soc_ver(), |
102 | rt2880_get_soc_rev()); |
103 | |
104 | soc_info->mem_base = RT2880_SDRAM_BASE; |
105 | soc_info->mem_size_min = RT2880_MEM_SIZE_MIN; |
106 | soc_info->mem_size_max = RT2880_MEM_SIZE_MAX; |
107 | |
108 | ralink_soc = RT2880_SOC; |
109 | soc_info_ptr = soc_info; |
110 | } |
111 | |