arch/ppc/platforms/4xx/xilinx_ml403.c

   1 /*
   2  * Xilinx ML403 evaluation board initialization
   3  *
   4  * Author: Grant Likely <grant.likely@secretlab.ca>
   5  *
   6  * 2005-2007 (c) Secret Lab Technologies Ltd.
   7  * 2002-2004 (c) MontaVista Software, Inc.
   8  *
   9  * This file is licensed under the terms of the GNU General Public License
  10  * version 2.  This program is licensed "as is" without any warranty of any
  11  * kind, whether express or implied.
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/irq.h>
  16 #include <linux/tty.h>
  17 #include <linux/serial.h>
  18 #include <linux/serial_core.h>
  19 #include <linux/serial_8250.h>
  20 #include <linux/serialP.h>
  21 #include <asm/io.h>
  22 #include <asm/machdep.h>
  23
  24 #include <syslib/gen550.h>
  25 #include <syslib/virtex_devices.h>
  26 #include <platforms/4xx/xparameters/xparameters.h>
  27
  28 /*
  29  * As an overview of how the following functions (platform_init,
  30  * ml403_map_io, ml403_setup_arch and ml403_init_IRQ) fit into the
  31  * kernel startup procedure, here's a call tree:
  32  *
  33  * start_here                                   arch/ppc/kernel/head_4xx.S
  34  *  early_init                                  arch/ppc/kernel/setup.c
  35  *  machine_init                                arch/ppc/kernel/setup.c
  36  *    platform_init                             this file
  37  *      ppc4xx_init                             arch/ppc/syslib/ppc4xx_setup.c
  38  *        parse_bootinfo
  39  *          find_bootinfo
  40  *        "setup some default ppc_md pointers"
  41  *  MMU_init                                    arch/ppc/mm/init.c
  42  *    *ppc_md.setup_io_mappings == ml403_map_io this file
  43  *      ppc4xx_map_io                           arch/ppc/syslib/ppc4xx_setup.c
  44  *  start_kernel                                init/main.c
  45  *    setup_arch                                arch/ppc/kernel/setup.c
  46  * #if defined(CONFIG_KGDB)
  47  *      *ppc_md.kgdb_map_scc() == gen550_kgdb_map_scc
  48  * #endif
  49  *      *ppc_md.setup_arch == ml403_setup_arch  this file
  50  *        ppc4xx_setup_arch                     arch/ppc/syslib/ppc4xx_setup.c
  51  *          ppc4xx_find_bridges                 arch/ppc/syslib/ppc405_pci.c
  52  *    init_IRQ                                  arch/ppc/kernel/irq.c
  53  *      *ppc_md.init_IRQ == ml403_init_IRQ      this file
  54  *        ppc4xx_init_IRQ                       arch/ppc/syslib/ppc4xx_setup.c
  55  *          ppc4xx_pic_init                     arch/ppc/syslib/xilinx_pic.c
  56  */
  57
  58 const char* virtex_machine_name = "ML403 Reference Design";
  59
  60 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  61 static volatile unsigned *powerdown_base =
  62     (volatile unsigned *) XPAR_POWER_0_POWERDOWN_BASEADDR;
  63
  64 static void
  65 xilinx_power_off(void)
  66 {
  67         local_irq_disable();
  68         out_be32(powerdown_base, XPAR_POWER_0_POWERDOWN_VALUE);
  69         while (1) ;
  70 }
  71 #endif
  72
  73 void __init
  74 ml403_map_io(void)
  75 {
  76         ppc4xx_map_io();
  77
  78 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  79         powerdown_base = ioremap((unsigned long) powerdown_base,
  80                                  XPAR_POWER_0_POWERDOWN_HIGHADDR -
  81                                  XPAR_POWER_0_POWERDOWN_BASEADDR + 1);
  82 #endif
  83 }
  84
  85 void __init
  86 ml403_setup_arch(void)
  87 {
  88         virtex_early_serial_map();
  89         ppc4xx_setup_arch();    /* calls ppc4xx_find_bridges() */
  90
  91         /* Identify the system */
  92         printk(KERN_INFO "Xilinx ML403 Reference System (Virtex-4 FX)\n");
  93 }
  94
  95 /* Called after board_setup_irq from ppc4xx_init_IRQ(). */
  96 void __init
  97 ml403_init_irq(void)
  98 {
  99         ppc4xx_init_IRQ();
 100 }
 101
 102 void __init
 103 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 104               unsigned long r6, unsigned long r7)
 105 {
 106         ppc4xx_init(r3, r4, r5, r6, r7);
 107
 108         ppc_md.setup_arch = ml403_setup_arch;
 109         ppc_md.setup_io_mappings = ml403_map_io;
 110         ppc_md.init_IRQ = ml403_init_irq;
 111
 112 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
 113         ppc_md.power_off = xilinx_power_off;
 114 #endif
 115
 116 #ifdef CONFIG_KGDB
 117         ppc_md.early_serial_map = virtex_early_serial_map;
 118 #endif
 119 }
 120