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/bug.h>
 14#include <linux/slab.h>
 15#include <linux/sys_soc.h>
 16
 17#include <asm/io.h>
 18#include <asm/mipsregs.h>
 19#include <asm/mach-ralink/ralink_regs.h>
 20#include <asm/mach-ralink/rt305x.h>
 21
 22#include "common.h"
 23
 24static struct ralink_soc_info *soc_info_ptr;
 25
 26static unsigned long rt5350_get_mem_size(void)
 27{
 28	unsigned long ret;
 29	u32 t;
 30
 31	t = __raw_readl(RT305X_SYSC_BASE + SYSC_REG_SYSTEM_CONFIG);
 32	t = (t >> RT5350_SYSCFG0_DRAM_SIZE_SHIFT) &
 33		RT5350_SYSCFG0_DRAM_SIZE_MASK;
 34
 35	switch (t) {
 36	case RT5350_SYSCFG0_DRAM_SIZE_2M:
 37		ret = 2;
 38		break;
 39	case RT5350_SYSCFG0_DRAM_SIZE_8M:
 40		ret = 8;
 41		break;
 42	case RT5350_SYSCFG0_DRAM_SIZE_16M:
 43		ret = 16;
 44		break;
 45	case RT5350_SYSCFG0_DRAM_SIZE_32M:
 46		ret = 32;
 47		break;
 48	case RT5350_SYSCFG0_DRAM_SIZE_64M:
 49		ret = 64;
 50		break;
 51	default:
 52		panic("rt5350: invalid DRAM size: %u", t);
 53		break;
 54	}
 55
 56	return ret;
 57}
 58
 59static unsigned int __init rt305x_get_soc_name0(void)
 60{
 61	return __raw_readl(RT305X_SYSC_BASE + SYSC_REG_CHIP_NAME0);
 62}
 63
 64static unsigned int __init rt305x_get_soc_name1(void)
 65{
 66	return __raw_readl(RT305X_SYSC_BASE + SYSC_REG_CHIP_NAME1);
 67}
 68
 69static bool __init rt3052_soc_valid(void)
 70{
 71	if (rt305x_get_soc_name0() == RT3052_CHIP_NAME0 &&
 72	    rt305x_get_soc_name1() == RT3052_CHIP_NAME1)
 73		return true;
 74	else
 75		return false;
 76}
 77
 78static bool __init rt3350_soc_valid(void)
 79{
 80	if (rt305x_get_soc_name0() == RT3350_CHIP_NAME0 &&
 81	    rt305x_get_soc_name1() == RT3350_CHIP_NAME1)
 82		return true;
 83	else
 84		return false;
 85}
 86
 87static bool __init rt3352_soc_valid(void)
 88{
 89	if (rt305x_get_soc_name0() == RT3352_CHIP_NAME0 &&
 90	    rt305x_get_soc_name1() == RT3352_CHIP_NAME1)
 91		return true;
 92	else
 93		return false;
 94}
 95
 96static bool __init rt5350_soc_valid(void)
 97{
 98	if (rt305x_get_soc_name0() == RT5350_CHIP_NAME0 &&
 99	    rt305x_get_soc_name1() == RT5350_CHIP_NAME1)
100		return true;
101	else
102		return false;
103}
104
105static const char __init *rt305x_get_soc_name(struct ralink_soc_info *soc_info)
106{
107	if (rt3052_soc_valid()) {
108		unsigned long icache_sets;
109
110		icache_sets = (read_c0_config1() >> 22) & 7;
111		if (icache_sets == 1) {
112			ralink_soc = RT305X_SOC_RT3050;
113			soc_info->compatible = "ralink,rt3050-soc";
114			return "RT3050";
115		} else {
116			ralink_soc = RT305X_SOC_RT3052;
117			soc_info->compatible = "ralink,rt3052-soc";
118			return "RT3052";
119		}
120	} else if (rt3350_soc_valid()) {
121		ralink_soc = RT305X_SOC_RT3350;
122		soc_info->compatible = "ralink,rt3350-soc";
123		return "RT3350";
124	} else if (rt3352_soc_valid()) {
125		ralink_soc = RT305X_SOC_RT3352;
126		soc_info->compatible = "ralink,rt3352-soc";
127		return "RT3352";
128	} else if (rt5350_soc_valid()) {
129		ralink_soc = RT305X_SOC_RT5350;
130		soc_info->compatible = "ralink,rt5350-soc";
131		return "RT5350";
132	} else {
133		panic("rt305x: unknown SoC, n0:%08x n1:%08x",
134		      rt305x_get_soc_name0(), rt305x_get_soc_name1());
135	}
136}
137
138static unsigned int __init rt305x_get_soc_id(void)
139{
140	return __raw_readl(RT305X_SYSC_BASE + SYSC_REG_CHIP_ID);
141}
142
143static unsigned int __init rt305x_get_soc_ver(void)
144{
145	return (rt305x_get_soc_id() >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK;
146}
147
148static unsigned int __init rt305x_get_soc_rev(void)
149{
150	return (rt305x_get_soc_id() & CHIP_ID_REV_MASK);
151}
152
153static const char __init *rt305x_get_soc_id_name(void)
154{
155	if (soc_is_rt3050())
156		return "rt3050";
157	else if (soc_is_rt3052())
158		return "rt3052";
159	else if (soc_is_rt3350())
160		return "rt3350";
161	else if (soc_is_rt3352())
162		return "rt3352";
163	else if (soc_is_rt5350())
164		return "rt5350";
165	else
166		return "invalid";
167}
168
169static int __init rt305x_soc_dev_init(void)
170{
171	struct soc_device *soc_dev;
172	struct soc_device_attribute *soc_dev_attr;
173
174	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
175	if (!soc_dev_attr)
176		return -ENOMEM;
177
178	soc_dev_attr->family = "Ralink";
179	soc_dev_attr->soc_id = rt305x_get_soc_id_name();
180
181	soc_dev_attr->data = soc_info_ptr;
182
183	soc_dev = soc_device_register(soc_dev_attr);
184	if (IS_ERR(soc_dev)) {
185		kfree(soc_dev_attr);
186		return PTR_ERR(soc_dev);
187	}
188
189	return 0;
190}
191device_initcall(rt305x_soc_dev_init);
192
193void __init prom_soc_init(struct ralink_soc_info *soc_info)
194{
195	const char *name = rt305x_get_soc_name(soc_info);
196
197	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
198		"Ralink %s id:%u rev:%u",
199		name,
200		rt305x_get_soc_ver(),
201		rt305x_get_soc_rev());
202
203	soc_info->mem_base = RT305X_SDRAM_BASE;
204	if (soc_is_rt5350()) {
205		soc_info->mem_size = rt5350_get_mem_size();
206	} else if (soc_is_rt305x() || soc_is_rt3350()) {
207		soc_info->mem_size_min = RT305X_MEM_SIZE_MIN;
208		soc_info->mem_size_max = RT305X_MEM_SIZE_MAX;
209	} else if (soc_is_rt3352()) {
210		soc_info->mem_size_min = RT3352_MEM_SIZE_MIN;
211		soc_info->mem_size_max = RT3352_MEM_SIZE_MAX;
212	}
213
214	soc_info_ptr = soc_info;
215}