arch/mips/cobalt/serial.c

   1 /*
   2  *  Registration of Cobalt UART platform device.
   3  *
   4  *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>
   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 #include <irq.h>
  28
  29 static struct resource cobalt_uart_resource[] __initdata = {
  30         {
  31                 .start  = 0x1c800000,
  32                 .end    = 0x1c800007,
  33                 .flags  = IORESOURCE_MEM,
  34         },
  35         {
  36                 .start  = SERIAL_IRQ,
  37                 .end    = SERIAL_IRQ,
  38                 .flags  = IORESOURCE_IRQ,
  39         },
  40 };
  41
  42 static struct plat_serial8250_port cobalt_serial8250_port[] = {
  43         {
  44                 .irq            = SERIAL_IRQ,
  45                 .uartclk        = 18432000,
  46                 .iotype         = UPIO_MEM,
  47                 .flags          = UPF_IOREMAP | UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  48                 .mapbase        = 0x1c800000,
  49         },
  50         {},
  51 };
  52
  53 static __init int cobalt_uart_add(void)
  54 {
  55         struct platform_device *pdev;
  56         int retval;
  57
  58         /*
  59          * Cobalt Qube1 has no UART.
  60          */
  61         if (cobalt_board_id == COBALT_BRD_ID_QUBE1)
  62                 return 0;
  63
  64         pdev = platform_device_alloc("serial8250", -1);
  65         if (!pdev)
  66                 return -ENOMEM;
  67
  68         pdev->id = PLAT8250_DEV_PLATFORM;
  69         pdev->dev.platform_data = cobalt_serial8250_port;
  70
  71         retval = platform_device_add_resources(pdev, cobalt_uart_resource, ARRAY_SIZE(cobalt_uart_resource));
  72         if (retval)
  73                 goto err_free_device;
  74
  75         retval = platform_device_add(pdev);
  76         if (retval)
  77                 goto err_free_device;
  78
  79         return 0;
  80
  81 err_free_device:
  82         platform_device_put(pdev);
  83
  84         return retval;
  85 }
  86 device_initcall(cobalt_uart_add);