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

   1/*
   2 *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
   3 *  Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>
   4 *  JZ4740 setup code
   5 *
   6 *  This program is free software; you can redistribute it and/or modify it
   7 *  under  the terms of the GNU General  Public License as published by the
   8 *  Free Software Foundation;  either version 2 of the License, or (at your
   9 *  option) any later version.
  10 *
  11 *  You should have received a copy of the GNU General Public License along
  12 *  with this program; if not, write to the Free Software Foundation, Inc.,
  13 *  675 Mass Ave, Cambridge, MA 02139, USA.
  14 *
  15 */
  16
  17#include <linux/init.h>
  18#include <linux/io.h>
  19#include <linux/irqchip.h>
  20#include <linux/kernel.h>
  21#include <linux/libfdt.h>
  22#include <linux/of_fdt.h>
  23
  24#include <asm/bootinfo.h>
  25#include <asm/prom.h>
  26
  27#include <asm/mach-jz4740/base.h>
  28
  29#include "reset.h"
  30
  31
  32#define JZ4740_EMC_SDRAM_CTRL 0x80
  33
  34
  35static void __init jz4740_detect_mem(void)
  36{
  37        void __iomem *jz_emc_base;
  38        u32 ctrl, bus, bank, rows, cols;
  39        phys_addr_t size;
  40
  41        jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
  42        ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
  43        bus = 2 - ((ctrl >> 31) & 1);
  44        bank = 1 + ((ctrl >> 19) & 1);
  45        cols = 8 + ((ctrl >> 26) & 7);
  46        rows = 11 + ((ctrl >> 20) & 3);
  47        printk(KERN_DEBUG
  48                "SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
  49                bus, bank, rows, cols);
  50        iounmap(jz_emc_base);
  51
  52        size = 1 << (bus + bank + cols + rows);
  53        add_memory_region(0, size, BOOT_MEM_RAM);
  54}
  55
  56static unsigned long __init get_board_mach_type(const void *fdt)
  57{
  58        if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
  59                return MACH_INGENIC_JZ4780;
  60        if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4770"))
  61                return MACH_INGENIC_JZ4770;
  62
  63        return MACH_INGENIC_JZ4740;
  64}
  65
  66void __init plat_mem_setup(void)
  67{
  68        int offset;
  69
  70        jz4740_reset_init();
  71        __dt_setup_arch(__dtb_start);
  72
  73        offset = fdt_path_offset(__dtb_start, "/memory");
  74        if (offset < 0)
  75                jz4740_detect_mem();
  76
  77        mips_machtype = get_board_mach_type(__dtb_start);
  78}
  79
  80void __init device_tree_init(void)
  81{
  82        if (!initial_boot_params)
  83                return;
  84
  85        unflatten_and_copy_device_tree();
  86}
  87
  88const char *get_system_type(void)
  89{
  90        switch (mips_machtype) {
  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