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   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/config.h>
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15 #include <linux/tty.h>
  16 #include <linux/serial.h>
  17 #include <linux/serial_core.h>
  18 #include <linux/serial_8250.h>
  19 #include <linux/serialP.h>
  20 #include <asm/io.h>
  21 #include <asm/machdep.h>
  22 #include <asm/ppc_sys.h>
  23
  24 #include <syslib/gen550.h>
  25 #include <platforms/4xx/xparameters/xparameters.h>
  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 /* Board specifications structures */
  58 struct ppc_sys_spec *cur_ppc_sys_spec;
  59 struct ppc_sys_spec ppc_sys_specs[] = {
  60         {
  61                 /* Only one entry, always assume the same design */
  62                 .ppc_sys_name   = "Xilinx ML300 Reference Design",
  63                 .mask           = 0x00000000,
  64                 .value          = 0x00000000,
  65                 .num_devices    = 1,
  66                 .device_list    = (enum ppc_sys_devices[])
  67                 {
  68                         VIRTEX_UART,
  69                 },
  70         },
  71 };
  72
  73 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  74
  75 static volatile unsigned *powerdown_base =
  76     (volatile unsigned *) XPAR_POWER_0_POWERDOWN_BASEADDR;
  77
  78 static void
  79 xilinx_power_off(void)
  80 {
  81         local_irq_disable();
  82         out_be32(powerdown_base, XPAR_POWER_0_POWERDOWN_VALUE);
  83         while (1) ;
  84 }
  85 #endif
  86
  87 void __init
  88 ml300_map_io(void)
  89 {
  90         ppc4xx_map_io();
  91
  92 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  93         powerdown_base = ioremap((unsigned long) powerdown_base,
  94                                  XPAR_POWER_0_POWERDOWN_HIGHADDR -
  95                                  XPAR_POWER_0_POWERDOWN_BASEADDR + 1);
  96 #endif
  97 }
  98
  99 /* Early serial support functions */
 100 static void __init
 101 ml300_early_serial_init(int num, struct plat_serial8250_port *pdata)
 102 {
 103 #if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
 104         struct uart_port serial_req;
 105
 106         memset(&serial_req, 0, sizeof(serial_req));
 107         serial_req.mapbase      = pdata->mapbase;
 108         serial_req.membase      = pdata->membase;
 109         serial_req.irq          = pdata->irq;
 110         serial_req.uartclk      = pdata->uartclk;
 111         serial_req.regshift     = pdata->regshift;
 112         serial_req.iotype       = pdata->iotype;
 113         serial_req.flags        = pdata->flags;
 114         gen550_init(num, &serial_req);
 115 #endif
 116 }
 117
 118 void __init
 119 ml300_early_serial_map(void)
 120 {
 121 #ifdef CONFIG_SERIAL_8250
 122         struct plat_serial8250_port *pdata;
 123         int i = 0;
 124
 125         pdata = (struct plat_serial8250_port *) ppc_sys_get_pdata(VIRTEX_UART);
 126         while(pdata && pdata->flags)
 127         {
 128                 pdata->membase = ioremap(pdata->mapbase, 0x100);
 129                 ml300_early_serial_init(i, pdata);
 130                 pdata++;
 131                 i++;
 132         }
 133 #endif /* CONFIG_SERIAL_8250 */
 134 }
 135
 136 void __init
 137 ml300_setup_arch(void)
 138 {
 139         ml300_early_serial_map();
 140         ppc4xx_setup_arch();    /* calls ppc4xx_find_bridges() */
 141
 142         /* Identify the system */
 143         printk(KERN_INFO "Xilinx Virtex-II Pro port\n");
 144         printk(KERN_INFO "Port by MontaVista Software, Inc. (source@mvista.com)\n");
 145 }
 146
 147 /* Called after board_setup_irq from ppc4xx_init_IRQ(). */
 148 void __init
 149 ml300_init_irq(void)
 150 {
 151         ppc4xx_init_IRQ();
 152 }
 153
 154 void __init
 155 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 156               unsigned long r6, unsigned long r7)
 157 {
 158         ppc4xx_init(r3, r4, r5, r6, r7);
 159
 160         identify_ppc_sys_by_id(mfspr(SPRN_PVR));
 161
 162         ppc_md.setup_arch = ml300_setup_arch;
 163         ppc_md.setup_io_mappings = ml300_map_io;
 164         ppc_md.init_IRQ = ml300_init_irq;
 165
 166 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
 167         ppc_md.power_off = xilinx_power_off;
 168 #endif
 169
 170 #ifdef CONFIG_KGDB
 171         ppc_md.early_serial_map = ml300_early_serial_map;
 172 #endif
 173 }
 174