release/src-rt-6.x/linux/linux-2.6/arch/mips/cobalt/serial.c

   1 /*
   2  *  Registration of Cobalt UART platform device.
   3  *
   4  *  Copyright (C) 2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/ioport.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/serial_8250.h>
  25
  26 #include <cobalt.h>
  27
  28 static struct resource cobalt_uart_resource[] __initdata = {
  29         {
  30                 .start  = 0x1c800000,
  31                 .end    = 0x1c800007,
  32                 .flags  = IORESOURCE_MEM,
  33         },
  34         {
  35                 .start  = COBALT_SERIAL_IRQ,
  36                 .end    = COBALT_SERIAL_IRQ,
  37                 .flags  = IORESOURCE_IRQ,
  38         },
  39 };
  40
  41 static struct plat_serial8250_port cobalt_serial8250_port[] = {
  42         {
  43                 .irq            = COBALT_SERIAL_IRQ,
  44                 .uartclk        = 18432000,
  45                 .iotype         = UPIO_MEM,
  46                 .flags          = UPF_IOREMAP | UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  47                 .mapbase        = 0x1c800000,
  48         },
  49         {},
  50 };
  51
  52 static __init int cobalt_uart_add(void)
  53 {
  54         struct platform_device *pdev;
  55         int retval;
  56
  57         /*
  58          * Cobalt Qube1 and RAQ1 have no UART.
  59          */
  60         if (cobalt_board_id <= COBALT_BRD_ID_RAQ1)
  61                 return 0;
  62
  63         pdev = platform_device_alloc("serial8250", -1);
  64         if (!pdev)
  65                 return -ENOMEM;
  66
  67         pdev->id = PLAT8250_DEV_PLATFORM;
  68         pdev->dev.platform_data = cobalt_serial8250_port;
  69
  70         retval = platform_device_add_resources(pdev, cobalt_uart_resource, ARRAY_SIZE(cobalt_uart_resource));
  71         if (retval)
  72                 goto err_free_device;
  73
  74         retval = platform_device_add(pdev);
  75         if (retval)
  76                 goto err_free_device;
  77
  78         return 0;
  79
  80 err_free_device:
  81         platform_device_put(pdev);
  82
  83         return retval;
  84 }
  85 device_initcall(cobalt_uart_add);