arch/ppc/platforms/4xx/xilinx_ml300.c

   1 /*
   2  * Xilinx ML300 evaluation board initialization
   3  *
   4  * Author: MontaVista Software, Inc.
   5  *         source@mvista.com
   6  *
   7  * 2002-2004 (c) MontaVista Software, Inc.  This file is licensed under the
   8  * terms of the GNU General Public License version 2.  This program is licensed
   9  * "as is" without any warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <linux/tty.h>
  15 #include <linux/serial.h>
  16 #include <linux/serial_core.h>
  17 #include <linux/serial_8250.h>
  18 #include <linux/serialP.h>
  19 #include <asm/io.h>
  20 #include <asm/machdep.h>
  21
  22 #include <syslib/gen550.h>
  23 #include <syslib/virtex_devices.h>
  24 #include <platforms/4xx/xparameters/xparameters.h>
  25
  26 /*
  27  * As an overview of how the following functions (platform_init,
  28  * ml300_map_io, ml300_setup_arch and ml300_init_IRQ) fit into the
  29  * kernel startup procedure, here's a call tree:
  30  *
  31  * start_here                                   arch/ppc/kernel/head_4xx.S
  32  *  early_init                                  arch/ppc/kernel/setup.c
  33  *  machine_init                                arch/ppc/kernel/setup.c
  34  *    platform_init                             this file
  35  *      ppc4xx_init                             arch/ppc/syslib/ppc4xx_setup.c
  36  *        parse_bootinfo
  37  *          find_bootinfo
  38  *        "setup some default ppc_md pointers"
  39  *  MMU_init                                    arch/ppc/mm/init.c
  40  *    *ppc_md.setup_io_mappings == ml300_map_io this file
  41  *      ppc4xx_map_io                           arch/ppc/syslib/ppc4xx_setup.c
  42  *  start_kernel                                init/main.c
  43  *    setup_arch                                arch/ppc/kernel/setup.c
  44  * #if defined(CONFIG_KGDB)
  45  *      *ppc_md.kgdb_map_scc() == gen550_kgdb_map_scc
  46  * #endif
  47  *      *ppc_md.setup_arch == ml300_setup_arch  this file
  48  *        ppc4xx_setup_arch                     arch/ppc/syslib/ppc4xx_setup.c
  49  *          ppc4xx_find_bridges                 arch/ppc/syslib/ppc405_pci.c
  50  *    init_IRQ                                  arch/ppc/kernel/irq.c
  51  *      *ppc_md.init_IRQ == ml300_init_IRQ      this file
  52  *        ppc4xx_init_IRQ                       arch/ppc/syslib/ppc4xx_setup.c
  53  *          ppc4xx_pic_init                     arch/ppc/syslib/xilinx_pic.c
  54  */
  55
  56 const char* virtex_machine_name = "ML300 Reference Design";
  57
  58 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  59 static volatile unsigned *powerdown_base =
  60     (volatile unsigned *) XPAR_POWER_0_POWERDOWN_BASEADDR;
  61
  62 static void
  63 xilinx_power_off(void)
  64 {
  65         local_irq_disable();
  66         out_be32(powerdown_base, XPAR_POWER_0_POWERDOWN_VALUE);
  67         while (1) ;
  68 }
  69 #endif
  70
  71 void __init
  72 ml300_map_io(void)
  73 {
  74         ppc4xx_map_io();
  75
  76 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  77         powerdown_base = ioremap((unsigned long) powerdown_base,
  78                                  XPAR_POWER_0_POWERDOWN_HIGHADDR -
  79                                  XPAR_POWER_0_POWERDOWN_BASEADDR + 1);
  80 #endif
  81 }
  82
  83 void __init
  84 ml300_setup_arch(void)
  85 {
  86         virtex_early_serial_map();
  87         ppc4xx_setup_arch();    /* calls ppc4xx_find_bridges() */
  88
  89         /* Identify the system */
  90         printk(KERN_INFO "Xilinx ML300 Reference System (Virtex-II Pro)\n");
  91 }
  92
  93 /* Called after board_setup_irq from ppc4xx_init_IRQ(). */
  94 void __init
  95 ml300_init_irq(void)
  96 {
  97         ppc4xx_init_IRQ();
  98 }
  99
 100 void __init
 101 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 102               unsigned long r6, unsigned long r7)
 103 {
 104         ppc4xx_init(r3, r4, r5, r6, r7);
 105
 106         ppc_md.setup_arch = ml300_setup_arch;
 107         ppc_md.setup_io_mappings = ml300_map_io;
 108         ppc_md.init_IRQ = ml300_init_irq;
 109
 110 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
 111         ppc_md.power_off = xilinx_power_off;
 112 #endif
 113
 114 #ifdef CONFIG_KGDB
 115         ppc_md.early_serial_map = virtex_early_serial_map;
 116 #endif
 117 }
 118