arch/mips/ralink/rt3883.c

   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
  22 static struct ralink_soc_info *soc_info_ptr;
  23
  24 static unsigned int __init rt3883_get_soc_name0(void)
  25 {
  26         return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID0_3);
  27 }
  28
  29 static unsigned int __init rt3883_get_soc_name1(void)
  30 {
  31         return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID4_7);
  32 }
  33
  34 static 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
  43 static const char __init *rt3883_get_soc_name(void)
  44 {
  45         if (rt3883_soc_valid())
  46                 return "RT3883";
  47         else
  48                 return "invalid";
  49 }
  50
  51 static unsigned int __init rt3883_get_soc_id(void)
  52 {
  53         return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_REVID);
  54 }
  55
  56 static 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
  61 static unsigned int __init rt3883_get_soc_rev(void)
  62 {
  63         return (rt3883_get_soc_id() & RT3883_REVID_ECO_ID_MASK);
  64 }
  65
  66 static 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 }
  88 device_initcall(rt3883_soc_dev_init);
  89
  90 void __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 }