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}