arch/mips/mti-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) 2006, 07 MIPS Technologies, Inc.
   7  *   written by Ralf Baechle (ralf@linux-mips.org)
   8  *     written by Ralf Baechle <ralf@linux-mips.org>
   9  *
  10  * Copyright (C) 2008 Wind River Systems, Inc.
  11  *   updated by Tiejun Chen <tiejun.chen@windriver.com>
  12  *
  13  * 1. Probe driver for the Malta's UART ports:
  14  *
  15  *   o 2 ports in the SMC SuperIO
  16  *   o 1 port in the CBUS UART, a discrete 16550 which normally is only used
  17  *     for bringups.
  18  *
  19  * We don't use 8250_platform.c on Malta as it would result in the CBUS
  20  * UART becoming ttyS0.
  21  *
  22  * 2. Register RTC-CMOS platform device on Malta.
  23  */
  24 #include <linux/init.h>
  25 #include <linux/serial_8250.h>
  26 #include <linux/irq.h>
  27 #include <linux/platform_device.h>
  28 #include <asm/mips-boards/maltaint.h>
  29
  30 #define SMC_PORT(base, int)                                             \
  31 {                                                                       \
  32         .iobase         = base,                                         \
  33         .irq            = int,                                          \
  34         .uartclk        = 1843200,                                      \
  35         .iotype         = UPIO_PORT,                                    \
  36         .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |           \
  37                           UPF_MAGIC_MULTIPLIER,                         \
  38         .regshift       = 0,                                            \
  39 }
  40
  41 #define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)
  42
  43 static struct plat_serial8250_port uart8250_data[] = {
  44         SMC_PORT(0x3F8, 4),
  45         SMC_PORT(0x2F8, 3),
  46 #ifndef CONFIG_MIPS_CMP
  47         {
  48                 .mapbase        = 0x1f000900,   /* The CBUS UART */
  49                 .irq            = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB2,
  50                 .uartclk        = 3686400,      /* Twice the usual clk! */
  51                 .iotype         = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ?
  52                                   UPIO_MEM32BE : UPIO_MEM32,
  53                 .flags          = CBUS_UART_FLAGS,
  54                 .regshift       = 3,
  55         },
  56 #endif
  57         { },
  58 };
  59
  60 static struct platform_device malta_uart8250_device = {
  61         .name                   = "serial8250",
  62         .id                     = PLAT8250_DEV_PLATFORM,
  63         .dev                    = {
  64                 .platform_data  = uart8250_data,
  65         },
  66 };
  67
  68 static struct platform_device *malta_devices[] __initdata = {
  69         &malta_uart8250_device,
  70 };
  71
  72 static int __init malta_add_devices(void)
  73 {
  74         return platform_add_devices(malta_devices, ARRAY_SIZE(malta_devices));
  75 }
  76
  77 device_initcall(malta_add_devices);