target/linux/atheros-2.6/files/arch/mips/atheros/prom.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright MontaVista Software Inc
   7  * Copyright (C) 2003 Atheros Communications, Inc.,  All Rights Reserved.
   8  * Copyright (C) 2006 FON Technology, SL.
   9  * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
  10  * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
  11  */
  12
  13 /*
  14  * Prom setup file for ar531x
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/autoconf.h>
  19 #include <linux/kernel.h>
  20 #include <linux/string.h>
  21 #include <linux/mm.h>
  22 #include <linux/bootmem.h>
  23
  24 #include <asm/bootinfo.h>
  25 #include <asm/addrspace.h>
  26 #include "ar531x.h"
  27
  28 void __init prom_init(void)
  29 {
  30         u32 memsize, memcfg;
  31
  32         mips_machgroup = MACH_GROUP_ATHEROS;
  33         mips_machtype = -1;
  34
  35         /*
  36          * Atheros CPUs before the AR2315 are using MIPS 4Kc core, later designs are
  37          * using MIPS 4KEc R2 core. This makes it easy to determine the board at runtime.
  38          */
  39
  40         if (current_cpu_data.cputype == CPU_4KEC) {
  41                 mips_machtype = MACH_ATHEROS_AR5315;
  42
  43                 memcfg = sysRegRead(AR5315_MEM_CFG);
  44                 memsize   = 1 + ((memcfg & SDRAM_DATA_WIDTH_M) >> SDRAM_DATA_WIDTH_S);
  45                 memsize <<= 1 + ((memcfg & SDRAM_COL_WIDTH_M) >> SDRAM_COL_WIDTH_S);
  46                 memsize <<= 1 + ((memcfg & SDRAM_ROW_WIDTH_M) >> SDRAM_ROW_WIDTH_S);
  47                 memsize <<= 3;
  48         } else {
  49                 int bank0AC, bank1AC;
  50
  51                 mips_machtype = MACH_ATHEROS_AR5312;
  52
  53                 memcfg = sysRegRead(AR531X_MEM_CFG1);
  54                 bank0AC = (memcfg & MEM_CFG1_AC0) >> MEM_CFG1_AC0_S;
  55                 bank1AC = (memcfg & MEM_CFG1_AC1) >> MEM_CFG1_AC1_S;
  56                 memsize = (bank0AC ? (1 << (bank0AC+1)) : 0)
  57                         + (bank1AC ? (1 << (bank1AC+1)) : 0);
  58                 memsize <<= 20;
  59         }
  60
  61         add_memory_region(0, memsize, BOOT_MEM_RAM);
  62         strcpy(arcs_cmdline, "console=ttyS0,9600 rootfstype=squashfs,jffs2");
  63 }
  64
  65 void __init prom_free_prom_memory(void)
  66 {
  67 }