164 lines
4.0 KiB
C
164 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Parts of this file are based on Ralink's 2.6.21 BSP
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*
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2013 John Crispin <john@phrozen.org>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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#include <asm/mipsregs.h>
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#include <asm/mach-ralink/ralink_regs.h>
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#include <asm/mach-ralink/rt3883.h>
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#include "common.h"
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static struct ralink_soc_info *soc_info_ptr;
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void __init ralink_clk_init(void)
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{
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unsigned long cpu_rate, sys_rate;
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u32 syscfg0;
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u32 clksel;
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u32 ddr2;
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syscfg0 = rt_sysc_r32(RT3883_SYSC_REG_SYSCFG0);
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clksel = ((syscfg0 >> RT3883_SYSCFG0_CPUCLK_SHIFT) &
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RT3883_SYSCFG0_CPUCLK_MASK);
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ddr2 = syscfg0 & RT3883_SYSCFG0_DRAM_TYPE_DDR2;
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switch (clksel) {
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case RT3883_SYSCFG0_CPUCLK_250:
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cpu_rate = 250000000;
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sys_rate = (ddr2) ? 125000000 : 83000000;
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break;
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case RT3883_SYSCFG0_CPUCLK_384:
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cpu_rate = 384000000;
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sys_rate = (ddr2) ? 128000000 : 96000000;
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break;
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case RT3883_SYSCFG0_CPUCLK_480:
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cpu_rate = 480000000;
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sys_rate = (ddr2) ? 160000000 : 120000000;
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break;
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case RT3883_SYSCFG0_CPUCLK_500:
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cpu_rate = 500000000;
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sys_rate = (ddr2) ? 166000000 : 125000000;
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break;
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}
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ralink_clk_add("cpu", cpu_rate);
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ralink_clk_add("10000100.timer", sys_rate);
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ralink_clk_add("10000120.watchdog", sys_rate);
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ralink_clk_add("10000500.uart", 40000000);
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ralink_clk_add("10000900.i2c", 40000000);
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ralink_clk_add("10000a00.i2s", 40000000);
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ralink_clk_add("10000b00.spi", sys_rate);
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ralink_clk_add("10000b40.spi", sys_rate);
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ralink_clk_add("10000c00.uartlite", 40000000);
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ralink_clk_add("10100000.ethernet", sys_rate);
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ralink_clk_add("10180000.wmac", 40000000);
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}
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void __init ralink_of_remap(void)
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{
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rt_sysc_membase = plat_of_remap_node("ralink,rt3883-sysc");
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rt_memc_membase = plat_of_remap_node("ralink,rt3883-memc");
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if (!rt_sysc_membase || !rt_memc_membase)
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panic("Failed to remap core resources");
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}
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static unsigned int __init rt3883_get_soc_name0(void)
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{
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return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID0_3);
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}
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static unsigned int __init rt3883_get_soc_name1(void)
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{
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return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_CHIPID4_7);
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}
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static bool __init rt3883_soc_valid(void)
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{
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if (rt3883_get_soc_name0() == RT3883_CHIP_NAME0 &&
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rt3883_get_soc_name1() == RT3883_CHIP_NAME1)
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return true;
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else
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return false;
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}
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static const char __init *rt3883_get_soc_name(void)
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{
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if (rt3883_soc_valid())
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return "RT3883";
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else
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return "invalid";
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}
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static unsigned int __init rt3883_get_soc_id(void)
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{
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return __raw_readl(RT3883_SYSC_BASE + RT3883_SYSC_REG_REVID);
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}
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static unsigned int __init rt3883_get_soc_ver(void)
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{
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return (rt3883_get_soc_id() >> RT3883_REVID_VER_ID_SHIFT) & RT3883_REVID_VER_ID_MASK;
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}
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static unsigned int __init rt3883_get_soc_rev(void)
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{
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return (rt3883_get_soc_id() & RT3883_REVID_ECO_ID_MASK);
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}
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static int __init rt3883_soc_dev_init(void)
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{
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struct soc_device *soc_dev;
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struct soc_device_attribute *soc_dev_attr;
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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soc_dev_attr->family = "Ralink";
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soc_dev_attr->soc_id = rt3883_get_soc_name();
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soc_dev_attr->data = soc_info_ptr;
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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kfree(soc_dev_attr);
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return PTR_ERR(soc_dev);
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}
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return 0;
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}
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device_initcall(rt3883_soc_dev_init);
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void __init prom_soc_init(struct ralink_soc_info *soc_info)
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{
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if (rt3883_soc_valid())
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soc_info->compatible = "ralink,rt3883-soc";
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else
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panic("rt3883: unknown SoC, n0:%08x n1:%08x",
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rt3883_get_soc_name0(), rt3883_get_soc_name1());
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snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
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"Ralink %s ver:%u eco:%u",
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rt3883_get_soc_name(),
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rt3883_get_soc_ver(),
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rt3883_get_soc_rev());
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soc_info->mem_base = RT3883_SDRAM_BASE;
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soc_info->mem_size_min = RT3883_MEM_SIZE_MIN;
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soc_info->mem_size_max = RT3883_MEM_SIZE_MAX;
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ralink_soc = RT3883_SOC;
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soc_info_ptr = soc_info;
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}
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