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 Imre Kaloz <kaloz@openwrt.org>
7 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@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/rt3883.h>
19
20#include "common.h"
21
22static struct ralink_soc_info *soc_info_ptr;
23
24static unsigned int __init rt3883_get_soc_name0(void)
25{
26	return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID0_3);
27}
28
29static unsigned int __init rt3883_get_soc_name1(void)
30{
31	return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID4_7);
32}
33
34static bool __init rt3883_soc_valid(void)
35{
36	if (rt3883_get_soc_name0() == RT3883_CHIP_NAME0 &&
37	    rt3883_get_soc_name1() == RT3883_CHIP_NAME1)
38		return true;
39	else
40		return false;
41}
42
43static const char __init *rt3883_get_soc_name(void)
44{
45	if (rt3883_soc_valid())
46		return "RT3883";
47	else
48		return "invalid";
49}
50
51static unsigned int __init rt3883_get_soc_id(void)
52{
53	return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_REVID);
54}
55
56static unsigned int __init rt3883_get_soc_ver(void)
57{
58	return (rt3883_get_soc_id() >> RT3883_REVID_VER_ID_SHIFT) & RT3883_REVID_VER_ID_MASK;
59}
60
61static unsigned int __init rt3883_get_soc_rev(void)
62{
63	return (rt3883_get_soc_id() & RT3883_REVID_ECO_ID_MASK);
64}
65
66static int __init rt3883_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(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 = rt3883_get_soc_name();
77
78	soc_dev_attr->data = soc_info_ptr;
79
80	soc_dev = soc_device_register(soc_dev_attr);
81	if (IS_ERR(soc_dev)) {
82		kfree(soc_dev_attr);
83		return PTR_ERR(soc_dev);
84	}
85
86	return 0;
87}
88device_initcall(rt3883_soc_dev_init);
89
90void __init prom_soc_init(struct ralink_soc_info *soc_info)
91{
92	if (rt3883_soc_valid())
93		soc_info->compatible = "ralink,rt3883-soc";
94	else
95		panic("rt3883: unknown SoC, n0:%08x n1:%08x",
96		      rt3883_get_soc_name0(), rt3883_get_soc_name1());
97
98	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
99		"Ralink %s ver:%u eco:%u",
100		rt3883_get_soc_name(),
101		rt3883_get_soc_ver(),
102		rt3883_get_soc_rev());
103
104	soc_info->mem_base = RT3883_SDRAM_BASE;
105	soc_info->mem_size_min = RT3883_MEM_SIZE_MIN;
106	soc_info->mem_size_max = RT3883_MEM_SIZE_MAX;
107
108	ralink_soc = RT3883_SOC;
109	soc_info_ptr = soc_info;
110}
111