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/delay.h>
  17 #include <linux/of_fdt.h>
  18 #include <linux/irqchip.h>
  19
  20 #include <asm/addrspace.h>
  21 #include <asm/io.h>
  22 #include <asm/bootinfo.h>
  23 #include <asm/time.h>
  24 #include <asm/prom.h>
  25 #include <asm/smp-ops.h>
  26
  27 #include "mach-rtl83xx.h"
  28
  29 extern struct rtl83xx_soc_info soc_info;
  30
  31 void __init plat_mem_setup(void)
  32 {
  33         void *dtb;
  34
  35         set_io_port_base(KSEG1);
  36
  37         if (fw_passed_dtb) /* UHI interface */
  38                 dtb = (void *)fw_passed_dtb;
  39         else if (&__dtb_start[0] != &__dtb_end[0])
  40                 dtb = (void *)__dtb_start;
  41         else
  42                 panic("no dtb found");
  43
  44         /*
  45          * Load the devicetree. This causes the chosen node to be
  46          * parsed resulting in our memory appearing
  47          */
  48         __dt_setup_arch(dtb);
  49 }
  50
  51 void __init plat_time_init(void)
  52 {
  53         struct device_node *np;
  54         u32 freq = 500000000;
  55
  56         of_clk_init(NULL);
  57         timer_probe();
  58
  59         np = of_find_node_by_name(NULL, "cpus");
  60         if (!np) {
  61                 pr_err("Missing 'cpus' DT node, using default frequency.");
  62         } else {
  63                 if (of_property_read_u32(np, "frequency", &freq) < 0)
  64                         pr_err("No 'frequency' property in DT, using default.");
  65                 else
  66                         pr_info("CPU frequency from device tree: %dMHz", freq / 1000000);
  67                 of_node_put(np);
  68         }
  69
  70         mips_hpt_frequency = freq / 2;
  71 }
  72
  73 void __init arch_init_irq(void)
  74 {
  75         irqchip_init();
  76 }