LXR linux/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
  43static 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
  60static struct platform_device malta_uart8250_device = {
  61        .name                   = "serial8250",
  62        .id                     = PLAT8250_DEV_PLATFORM,
  63        .dev                    = {
  64                .platform_data  = uart8250_data,
  65        },
  66};
  67
  68static struct platform_device *malta_devices[] __initdata = {
  69        &malta_uart8250_device,
  70};
  71
  72static int __init malta_add_devices(void)
  73{
  74        return platform_add_devices(malta_devices, ARRAY_SIZE(malta_devices));
  75}
  76
  77device_initcall(malta_add_devices);
  78