LXR linux/arch/mips/jz4740/setup.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
   4 *  Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>
   5 *  JZ4740 setup code
   6 */
   7
   8#include <linux/init.h>
   9#include <linux/io.h>
  10#include <linux/irqchip.h>
  11#include <linux/kernel.h>
  12#include <linux/libfdt.h>
  13#include <linux/of_fdt.h>
  14
  15#include <asm/bootinfo.h>
  16#include <asm/prom.h>
  17
  18#include "reset.h"
  19
  20#define JZ4740_EMC_BASE_ADDR 0x13010000
  21
  22#define JZ4740_EMC_SDRAM_CTRL 0x80
  23
  24static void __init jz4740_detect_mem(void)
  25{
  26        void __iomem *jz_emc_base;
  27        u32 ctrl, bus, bank, rows, cols;
  28        phys_addr_t size;
  29
  30        jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
  31        ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
  32        bus = 2 - ((ctrl >> 31) & 1);
  33        bank = 1 + ((ctrl >> 19) & 1);
  34        cols = 8 + ((ctrl >> 26) & 7);
  35        rows = 11 + ((ctrl >> 20) & 3);
  36        printk(KERN_DEBUG
  37                "SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
  38                bus, bank, rows, cols);
  39        iounmap(jz_emc_base);
  40
  41        size = 1 << (bus + bank + cols + rows);
  42        add_memory_region(0, size, BOOT_MEM_RAM);
  43}
  44
  45static unsigned long __init get_board_mach_type(const void *fdt)
  46{
  47        if (!fdt_node_check_compatible(fdt, 0, "ingenic,x1000"))
  48                return MACH_INGENIC_X1000;
  49        if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
  50                return MACH_INGENIC_JZ4780;
  51        if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4770"))
  52                return MACH_INGENIC_JZ4770;
  53
  54        return MACH_INGENIC_JZ4740;
  55}
  56
  57void __init plat_mem_setup(void)
  58{
  59        int offset;
  60        void *dtb;
  61
  62        jz4740_reset_init();
  63
  64        if (__dtb_start != __dtb_end)
  65                dtb = __dtb_start;
  66        else
  67                dtb = (void *)fw_passed_dtb;
  68
  69        __dt_setup_arch(dtb);
  70
  71        offset = fdt_path_offset(dtb, "/memory");
  72        if (offset < 0)
  73                jz4740_detect_mem();
  74
  75        mips_machtype = get_board_mach_type(dtb);
  76}
  77
  78void __init device_tree_init(void)
  79{
  80        if (!initial_boot_params)
  81                return;
  82
  83        unflatten_and_copy_device_tree();
  84}
  85
  86const char *get_system_type(void)
  87{
  88        switch (mips_machtype) {
  89        case MACH_INGENIC_X1000:
  90                return "X1000";
  91        case MACH_INGENIC_JZ4780:
  92                return "JZ4780";
  93        case MACH_INGENIC_JZ4770:
  94                return "JZ4770";
  95        default:
  96                return "JZ4740";
  97        }
  98}
  99
 100void __init arch_init_irq(void)
 101{
 102        irqchip_init();
 103}
 104