arch/mips/mips-boards/malta/malta_platform.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2007 MIPS Technologies, Inc.
   7  *   written by Ralf Baechle (ralf@linux-mips.org)
   8  *
   9  * Probe driver for the Malta's UART ports:
  10  *
  11  *   o 2 ports in the SMC SuperIO
  12  *   o 1 port in the CBUS UART, a discrete 16550 which normally is only used
  13  *     for bringups.
  14  *
  15  * We don't use 8250_platform.c on Malta as it would result in the CBUS
  16  * UART becoming ttyS0.
  17  */
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/serial_8250.h>
  21
  22 #define SMC_PORT(base, int)                                             \
  23 {                                                                       \
  24         .iobase         = base,                                         \
  25         .irq            = int,                                          \
  26         .uartclk        = 1843200,                                      \
  27         .iotype         = UPIO_PORT,                                    \
  28         .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,            \
  29         .regshift       = 0,                                            \
  30 }
  31
  32 #define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)
  33
  34 static struct plat_serial8250_port uart8250_data[] = {
  35         SMC_PORT(0x3F8, 4),
  36         SMC_PORT(0x2F8, 3),
  37         {
  38                 .mapbase        = 0x1f000900,   /* The CBUS UART */
  39                 .irq            = MIPS_CPU_IRQ_BASE + 2,
  40                 .uartclk        = 3686400,      /* Twice the usual clk! */
  41                 .iotype         = UPIO_MEM32,
  42                 .flags          = CBUS_UART_FLAGS,
  43                 .regshift       = 3,
  44         },
  45         { },
  46 };
  47
  48 static struct platform_device uart8250_device = {
  49         .name                   = "serial8250",
  50         .id                     = PLAT8250_DEV_PLATFORM2,
  51         .dev                    = {
  52                 .platform_data  = uart8250_data,
  53         },
  54 };
  55
  56 static int __init uart8250_init(void)
  57 {
  58         return platform_device_register(&uart8250_device);
  59 }
  60
  61 module_init(uart8250_init);
  62
  63 MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
  64 MODULE_LICENSE("GPL");
  65 MODULE_DESCRIPTION("8250 UART probe driver for the Malta CBUS UART");