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
  24 static 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
  45 static unsigned long __init get_board_mach_type(const void *fdt)
  46 {
  47         if (!fdt_node_check_compatible(fdt, 0, "ingenic,x1830"))
  48                 return MACH_INGENIC_X1830;
  49         if (!fdt_node_check_compatible(fdt, 0, "ingenic,x1000"))
  50                 return MACH_INGENIC_X1000;
  51         if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
  52                 return MACH_INGENIC_JZ4780;
  53         if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4770"))
  54                 return MACH_INGENIC_JZ4770;
  55
  56         return MACH_INGENIC_JZ4740;
  57 }
  58
  59 void __init plat_mem_setup(void)
  60 {
  61         int offset;
  62         void *dtb;
  63
  64         jz4740_reset_init();
  65
  66         if (__dtb_start != __dtb_end)
  67                 dtb = __dtb_start;
  68         else
  69                 dtb = (void *)fw_passed_dtb;
  70
  71         __dt_setup_arch(dtb);
  72
  73         offset = fdt_path_offset(dtb, "/memory");
  74         if (offset < 0)
  75                 jz4740_detect_mem();
  76
  77         mips_machtype = get_board_mach_type(dtb);
  78 }
  79
  80 void __init device_tree_init(void)
  81 {
  82         if (!initial_boot_params)
  83                 return;
  84
  85         unflatten_and_copy_device_tree();
  86 }
  87
  88 const char *get_system_type(void)
  89 {
  90         switch (mips_machtype) {
  91         case MACH_INGENIC_X1830:
  92                 return "X1830";
  93         case MACH_INGENIC_X1000:
  94                 return "X1000";
  95         case MACH_INGENIC_JZ4780:
  96                 return "JZ4780";
  97         case MACH_INGENIC_JZ4770:
  98                 return "JZ4770";
  99         default:
 100                 return "JZ4740";
 101         }
 102 }
 103
 104 void __init arch_init_irq(void)
 105 {
 106         irqchip_init();
 107 }