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 #include <asm/ppc_sys.h>
  22
  23 #include <syslib/gen550.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 /* Board specifications structures */
  57 struct ppc_sys_spec *cur_ppc_sys_spec;
  58 struct ppc_sys_spec ppc_sys_specs[] = {
  59         {
  60                 /* Only one entry, always assume the same design */
  61                 .ppc_sys_name   = "Xilinx ML300 Reference Design",
  62                 .mask           = 0x00000000,
  63                 .value          = 0x00000000,
  64                 .num_devices    = 1,
  65                 .device_list    = (enum ppc_sys_devices[])
  66                 {
  67                         VIRTEX_UART,
  68                 },
  69         },
  70 };
  71
  72 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  73
  74 static volatile unsigned *powerdown_base =
  75     (volatile unsigned *) XPAR_POWER_0_POWERDOWN_BASEADDR;
  76
  77 static void
  78 xilinx_power_off(void)
  79 {
  80         local_irq_disable();
  81         out_be32(powerdown_base, XPAR_POWER_0_POWERDOWN_VALUE);
  82         while (1) ;
  83 }
  84 #endif
  85
  86 void __init
  87 ml300_map_io(void)
  88 {
  89         ppc4xx_map_io();
  90
  91 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  92         powerdown_base = ioremap((unsigned long) powerdown_base,
  93                                  XPAR_POWER_0_POWERDOWN_HIGHADDR -
  94                                  XPAR_POWER_0_POWERDOWN_BASEADDR + 1);
  95 #endif
  96 }
  97
  98 /* Early serial support functions */
  99 static void __init
 100 ml300_early_serial_init(int num, struct plat_serial8250_port *pdata)
 101 {
 102 #if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
 103         struct uart_port serial_req;
 104
 105         memset(&serial_req, 0, sizeof(serial_req));
 106         serial_req.mapbase      = pdata->mapbase;
 107         serial_req.membase      = pdata->membase;
 108         serial_req.irq          = pdata->irq;
 109         serial_req.uartclk      = pdata->uartclk;
 110         serial_req.regshift     = pdata->regshift;
 111         serial_req.iotype       = pdata->iotype;
 112         serial_req.flags        = pdata->flags;
 113         gen550_init(num, &serial_req);
 114 #endif
 115 }
 116
 117 void __init
 118 ml300_early_serial_map(void)
 119 {
 120 #ifdef CONFIG_SERIAL_8250
 121         struct plat_serial8250_port *pdata;
 122         int i = 0;
 123
 124         pdata = (struct plat_serial8250_port *) ppc_sys_get_pdata(VIRTEX_UART);
 125         while(pdata && pdata->flags)
 126         {
 127                 pdata->membase = ioremap(pdata->mapbase, 0x100);
 128                 ml300_early_serial_init(i, pdata);
 129                 pdata++;
 130                 i++;
 131         }
 132 #endif /* CONFIG_SERIAL_8250 */
 133 }
 134
 135 void __init
 136 ml300_setup_arch(void)
 137 {
 138         ml300_early_serial_map();
 139         ppc4xx_setup_arch();    /* calls ppc4xx_find_bridges() */
 140
 141         /* Identify the system */
 142         printk(KERN_INFO "Xilinx Virtex-II Pro port\n");
 143         printk(KERN_INFO "Port by MontaVista Software, Inc. (source@mvista.com)\n");
 144 }
 145
 146 /* Called after board_setup_irq from ppc4xx_init_IRQ(). */
 147 void __init
 148 ml300_init_irq(void)
 149 {
 150         ppc4xx_init_IRQ();
 151 }
 152
 153 void __init
 154 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 155               unsigned long r6, unsigned long r7)
 156 {
 157         ppc4xx_init(r3, r4, r5, r6, r7);
 158
 159         identify_ppc_sys_by_id(mfspr(SPRN_PVR));
 160
 161         ppc_md.setup_arch = ml300_setup_arch;
 162         ppc_md.setup_io_mappings = ml300_map_io;
 163         ppc_md.init_IRQ = ml300_init_irq;
 164
 165 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
 166         ppc_md.power_off = xilinx_power_off;
 167 #endif
 168
 169 #ifdef CONFIG_KGDB
 170         ppc_md.early_serial_map = ml300_early_serial_map;
 171 #endif
 172 }
 173