target/linux/realtek/files-5.10/arch/mips/rtl838x/setup.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Setup for the Realtek RTL838X SoC:
   4  *      Memory, Timer and Serial
   5  *
   6  * Copyright (C) 2020 B. Koblitz
   7  * based on the original BSP by
   8  * Copyright (C) 2006-2012 Tony Wu (tonywu@realtek.com)
   9  *
  10  */
  11
  12 #include <linux/console.h>
  13 #include <linux/init.h>
  14 #include <linux/clkdev.h>
  15 #include <linux/clk-provider.h>
  16 #include <linux/clk.h>
  17 #include <linux/delay.h>
  18 #include <linux/of_fdt.h>
  19 #include <linux/irqchip.h>
  20
  21 #include <asm/addrspace.h>
  22 #include <asm/io.h>
  23 #include <asm/bootinfo.h>
  24 #include <asm/time.h>
  25 #include <asm/prom.h>
  26 #include <asm/smp-ops.h>
  27
  28 #include "mach-rtl83xx.h"
  29
  30 extern struct rtl83xx_soc_info soc_info;
  31
  32 void __init plat_mem_setup(void)
  33 {
  34         void *dtb;
  35
  36         set_io_port_base(KSEG1);
  37
  38         if (fw_passed_dtb) /* UHI interface */
  39                 dtb = (void *)fw_passed_dtb;
  40         else if (&__dtb_start[0] != &__dtb_end[0])
  41                 dtb = (void *)__dtb_start;
  42         else
  43                 panic("no dtb found");
  44
  45         /*
  46          * Load the devicetree. This causes the chosen node to be
  47          * parsed resulting in our memory appearing
  48          */
  49         __dt_setup_arch(dtb);
  50 }
  51
  52 void plat_time_init_fallback(void)
  53 {
  54         struct device_node *np;
  55         u32 freq = 500000000;
  56
  57         np = of_find_node_by_name(NULL, "cpus");
  58         if (!np) {
  59                 pr_err("Missing 'cpus' DT node, using default frequency.");
  60         } else {
  61                 if (of_property_read_u32(np, "frequency", &freq) < 0)
  62                         pr_err("No 'frequency' property in DT, using default.");
  63                 else
  64                         pr_info("CPU frequency from device tree: %dMHz", freq / 1000000);
  65                 of_node_put(np);
  66         }
  67         mips_hpt_frequency = freq / 2;
  68 }
  69
  70 void __init plat_time_init(void)
  71 {
  72 /*
  73  * Initialization routine resembles generic MIPS plat_time_init() with
  74  * lazy error handling. The final fallback is only needed until we have
  75  * converted all device trees to new clock syntax.
  76  */
  77         struct device_node *np;
  78         struct clk *clk;
  79
  80         of_clk_init(NULL);
  81
  82         mips_hpt_frequency = 0;
  83         np = of_get_cpu_node(0, NULL);
  84         if (!np) {
  85                 pr_err("Failed to get CPU node\n");
  86         } else {
  87                 clk = of_clk_get(np, 0);
  88                 if (IS_ERR(clk)) {
  89                         pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
  90                 } else {
  91                         mips_hpt_frequency = clk_get_rate(clk) / 2;
  92                         clk_put(clk);
  93                 }
  94         }
  95
  96         if (!mips_hpt_frequency)
  97                 plat_time_init_fallback();
  98
  99         timer_probe();
 100 }
 101
 102 void __init arch_init_irq(void)
 103 {
 104         irqchip_init();
 105 }