arch/mips/jazz/jazz-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 Ralf Baechle (ralf@linux-mips.org)
   7  */
   8 #include <linux/init.h>
   9 #include <linux/module.h>
  10 #include <linux/serial_8250.h>
  11
  12 #include <asm/jazz.h>
  13
  14 /*
  15  * Confusion ...  It seems the original Microsoft Jazz machine used to have a
  16  * 4.096MHz clock for its UART while the MIPS Magnum and Millenium systems
  17  * had 8MHz.  The Olivetti M700-10 and the Acer PICA have 1.8432MHz like PCs.
  18  */
  19 #ifdef CONFIG_OLIVETTI_M700
  20 #define JAZZ_BASE_BAUD 1843200
  21 #else
  22 #define JAZZ_BASE_BAUD  8000000 /* 3072000 */
  23 #endif
  24
  25 #define JAZZ_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)
  26
  27 #define JAZZ_PORT(base, int)                                            \
  28 {                                                                       \
  29         .mapbase        = base,                                         \
  30         .irq            = int,                                          \
  31         .uartclk        = JAZZ_BASE_BAUD,                               \
  32         .iotype         = UPIO_MEM,                                     \
  33         .flags          = JAZZ_UART_FLAGS,                              \
  34         .regshift       = 0,                                            \
  35 }
  36
  37 static struct plat_serial8250_port uart8250_data[] = {
  38         JAZZ_PORT(JAZZ_SERIAL1_BASE, JAZZ_SERIAL1_IRQ),
  39         JAZZ_PORT(JAZZ_SERIAL2_BASE, JAZZ_SERIAL2_IRQ),
  40         { },
  41 };
  42
  43 static struct platform_device uart8250_device = {
  44         .name                   = "serial8250",
  45         .id                     = PLAT8250_DEV_PLATFORM,
  46         .dev                    = {
  47                 .platform_data  = uart8250_data,
  48         },
  49 };
  50
  51 static int __init uart8250_init(void)
  52 {
  53         return platform_device_register(&uart8250_device);
  54 }
  55
  56 module_init(uart8250_init);
  57
  58 MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
  59 MODULE_LICENSE("GPL");
  60 MODULE_DESCRIPTION("8250 UART probe driver for the Jazz family");