git.oblomov.eu Git - linux-2.6/blob - arch/ppc/platforms/4xx/xilinx_ml300.c

   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/serial_8250.h>
  21 #include <linux/serialP.h>
  22 #include <asm/io.h>
  23 #include <asm/machdep.h>
  24 #include <asm/ppc_sys.h>
  25
  26 #include <syslib/gen550.h>
  27 #include <platforms/4xx/xparameters/xparameters.h>
  28
  29 /*
  30  * As an overview of how the following functions (platform_init,
  31  * ml300_map_io, ml300_setup_arch and ml300_init_IRQ) fit into the
  32  * kernel startup procedure, here's a call tree:
  33  *
  34  * start_here                                   arch/ppc/kernel/head_4xx.S
  35  *  early_init                                  arch/ppc/kernel/setup.c
  36  *  machine_init                                arch/ppc/kernel/setup.c
  37  *    platform_init                             this file
  38  *      ppc4xx_init                             arch/ppc/syslib/ppc4xx_setup.c
  39  *        parse_bootinfo
  40  *          find_bootinfo
  41  *        "setup some default ppc_md pointers"
  42  *  MMU_init                                    arch/ppc/mm/init.c
  43  *    *ppc_md.setup_io_mappings == ml300_map_io this file
  44  *      ppc4xx_map_io                           arch/ppc/syslib/ppc4xx_setup.c
  45  *  start_kernel                                init/main.c
  46  *    setup_arch                                arch/ppc/kernel/setup.c
  47  * #if defined(CONFIG_KGDB)
  48  *      *ppc_md.kgdb_map_scc() == gen550_kgdb_map_scc
  49  * #endif
  50  *      *ppc_md.setup_arch == ml300_setup_arch  this file
  51  *        ppc4xx_setup_arch                     arch/ppc/syslib/ppc4xx_setup.c
  52  *          ppc4xx_find_bridges                 arch/ppc/syslib/ppc405_pci.c
  53  *    init_IRQ                                  arch/ppc/kernel/irq.c
  54  *      *ppc_md.init_IRQ == ml300_init_IRQ      this file
  55  *        ppc4xx_init_IRQ                       arch/ppc/syslib/ppc4xx_setup.c
  56  *          ppc4xx_pic_init                     arch/ppc/syslib/xilinx_pic.c
  57  */
  58
  59 /* Board specifications structures */
  60 struct ppc_sys_spec *cur_ppc_sys_spec;
  61 struct ppc_sys_spec ppc_sys_specs[] = {
  62         {
  63                 /* Only one entry, always assume the same design */
  64                 .ppc_sys_name   = "Xilinx ML300 Reference Design",
  65                 .mask           = 0x00000000,
  66                 .value          = 0x00000000,
  67                 .num_devices    = 1,
  68                 .device_list    = (enum ppc_sys_devices[])
  69                 {
  70                         VIRTEX_UART,
  71                 },
  72         },
  73 };
  74
  75 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  76
  77 static volatile unsigned *powerdown_base =
  78     (volatile unsigned *) XPAR_POWER_0_POWERDOWN_BASEADDR;
  79
  80 static void
  81 xilinx_power_off(void)
  82 {
  83         local_irq_disable();
  84         out_be32(powerdown_base, XPAR_POWER_0_POWERDOWN_VALUE);
  85         while (1) ;
  86 }
  87 #endif
  88
  89 void __init
  90 ml300_map_io(void)
  91 {
  92         ppc4xx_map_io();
  93
  94 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  95         powerdown_base = ioremap((unsigned long) powerdown_base,
  96                                  XPAR_POWER_0_POWERDOWN_HIGHADDR -
  97                                  XPAR_POWER_0_POWERDOWN_BASEADDR + 1);
  98 #endif
  99 }
 100
 101 /* Early serial support functions */
 102 static void __init
 103 ml300_early_serial_init(int num, struct plat_serial8250_port *pdata)
 104 {
 105 #if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
 106         struct uart_port serial_req;
 107
 108         memset(&serial_req, 0, sizeof(serial_req));
 109         serial_req.mapbase      = pdata->mapbase;
 110         serial_req.membase      = pdata->membase;
 111         serial_req.irq          = pdata->irq;
 112         serial_req.uartclk      = pdata->uartclk;
 113         serial_req.regshift     = pdata->regshift;
 114         serial_req.iotype       = pdata->iotype;
 115         serial_req.flags        = pdata->flags;
 116         gen550_init(num, &serial_req);
 117 #endif
 118 }
 119
 120 void __init
 121 ml300_early_serial_map(void)
 122 {
 123 #ifdef CONFIG_SERIAL_8250
 124         struct plat_serial8250_port *pdata;
 125         int i = 0;
 126
 127         pdata = (struct plat_serial8250_port *) ppc_sys_get_pdata(VIRTEX_UART);
 128         while(pdata && pdata->flags)
 129         {
 130                 pdata->membase = ioremap(pdata->mapbase, 0x100);
 131                 ml300_early_serial_init(i, pdata);
 132                 pdata++;
 133                 i++;
 134         }
 135 #endif /* CONFIG_SERIAL_8250 */
 136 }
 137
 138 void __init
 139 ml300_setup_arch(void)
 140 {
 141         ml300_early_serial_map();
 142         ppc4xx_setup_arch();    /* calls ppc4xx_find_bridges() */
 143
 144         /* Identify the system */
 145         printk(KERN_INFO "Xilinx Virtex-II Pro port\n");
 146         printk(KERN_INFO "Port by MontaVista Software, Inc. (source@mvista.com)\n");
 147 }
 148
 149 /* Called after board_setup_irq from ppc4xx_init_IRQ(). */
 150 void __init
 151 ml300_init_irq(void)
 152 {
 153         ppc4xx_init_IRQ();
 154 }
 155
 156 void __init
 157 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 158               unsigned long r6, unsigned long r7)
 159 {
 160         ppc4xx_init(r3, r4, r5, r6, r7);
 161
 162         identify_ppc_sys_by_id(mfspr(SPRN_PVR));
 163
 164         ppc_md.setup_arch = ml300_setup_arch;
 165         ppc_md.setup_io_mappings = ml300_map_io;
 166         ppc_md.init_IRQ = ml300_init_irq;
 167
 168 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
 169         ppc_md.power_off = xilinx_power_off;
 170 #endif
 171
 172 #ifdef CONFIG_KGDB
 173         ppc_md.early_serial_map = ml300_early_serial_map;
 174 #endif
 175 }
 176