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   1 /*
   2  * arch/ppc/platforms/4xx/xilinx_ml300.c
   3  *
   4  * Xilinx ML300 evaluation board initialization
   5  *
   6  * Author: MontaVista Software, Inc.
   7  *         source@mvista.com
   8  *
   9  * 2002-2004 (c) MontaVista Software, Inc.  This file is licensed under the
  10  * terms of the GNU General Public License version 2.  This program is licensed
  11  * "as is" without any warranty of any kind, whether express or implied.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/init.h>
  16 #include <linux/irq.h>
  17 #include <linux/tty.h>
  18 #include <linux/serial.h>
  19 #include <linux/serial_core.h>
  20 #include <linux/serialP.h>
  21 #include <asm/io.h>
  22 #include <asm/machdep.h>
  23 #include <asm/ocp.h>
  24
  25 #include <platforms/4xx/virtex-ii_pro.h>        /* for NR_SER_PORTS */
  26
  27 /*
  28  * As an overview of how the following functions (platform_init,
  29  * ml300_map_io, ml300_setup_arch and ml300_init_IRQ) fit into the
  30  * kernel startup procedure, here's a call tree:
  31  *
  32  * start_here                                   arch/ppc/kernel/head_4xx.S
  33  *  early_init                                  arch/ppc/kernel/setup.c
  34  *  machine_init                                arch/ppc/kernel/setup.c
  35  *    platform_init                             this file
  36  *      ppc4xx_init                             arch/ppc/syslib/ppc4xx_setup.c
  37  *        parse_bootinfo
  38  *          find_bootinfo
  39  *        "setup some default ppc_md pointers"
  40  *  MMU_init                                    arch/ppc/mm/init.c
  41  *    *ppc_md.setup_io_mappings == ml300_map_io this file
  42  *      ppc4xx_map_io                           arch/ppc/syslib/ppc4xx_setup.c
  43  *  start_kernel                                init/main.c
  44  *    setup_arch                                arch/ppc/kernel/setup.c
  45  * #if defined(CONFIG_KGDB)
  46  *      *ppc_md.kgdb_map_scc() == gen550_kgdb_map_scc
  47  * #endif
  48  *      *ppc_md.setup_arch == ml300_setup_arch  this file
  49  *        ppc4xx_setup_arch                     arch/ppc/syslib/ppc4xx_setup.c
  50  *          ppc4xx_find_bridges                 arch/ppc/syslib/ppc405_pci.c
  51  *    init_IRQ                                  arch/ppc/kernel/irq.c
  52  *      *ppc_md.init_IRQ == ml300_init_IRQ      this file
  53  *        ppc4xx_init_IRQ                       arch/ppc/syslib/ppc4xx_setup.c
  54  *          ppc4xx_pic_init                     arch/ppc/syslib/xilinx_pic.c
  55  */
  56
  57 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  58
  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 static void __init
  84 ml300_early_serial_map(void)
  85 {
  86 #ifdef CONFIG_SERIAL_8250
  87         struct serial_state old_ports[] = { SERIAL_PORT_DFNS };
  88         struct uart_port port;
  89         int i;
  90
  91         /* Setup ioremapped serial port access */
  92         for (i = 0; i < ARRAY_SIZE(old_ports); i++ ) {
  93                 memset(&port, 0, sizeof(port));
  94                 port.membase = ioremap((phys_addr_t)(old_ports[i].iomem_base), 16);
  95                 port.irq = old_ports[i].irq;
  96                 port.uartclk = old_ports[i].baud_base * 16;
  97                 port.regshift = old_ports[i].iomem_reg_shift;
  98                 port.iotype = UPIO_MEM;
  99                 port.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST;
 100                 port.line = i;
 101
 102                 if (early_serial_setup(&port) != 0) {
 103                         printk("Early serial init of port %d failed\n", i);
 104                 }
 105         }
 106 #endif /* CONFIG_SERIAL_8250 */
 107 }
 108
 109 void __init
 110 ml300_setup_arch(void)
 111 {
 112         ppc4xx_setup_arch();    /* calls ppc4xx_find_bridges() */
 113
 114         ml300_early_serial_map();
 115
 116         /* Identify the system */
 117         printk(KERN_INFO "Xilinx Virtex-II Pro port\n");
 118         printk(KERN_INFO "Port by MontaVista Software, Inc. (source@mvista.com)\n");
 119 }
 120
 121 /* Called after board_setup_irq from ppc4xx_init_IRQ(). */
 122 void __init
 123 ml300_init_irq(void)
 124 {
 125         ppc4xx_init_IRQ();
 126 }
 127
 128 void __init
 129 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 130               unsigned long r6, unsigned long r7)
 131 {
 132         ppc4xx_init(r3, r4, r5, r6, r7);
 133
 134         ppc_md.setup_arch = ml300_setup_arch;
 135         ppc_md.setup_io_mappings = ml300_map_io;
 136         ppc_md.init_IRQ = ml300_init_irq;
 137
 138 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
 139         ppc_md.power_off = xilinx_power_off;
 140 #endif
 141
 142 #ifdef CONFIG_KGDB
 143         ppc_md.early_serial_map = ml300_early_serial_map;
 144 #endif
 145 }
 146