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malta-platform.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2007 MIPS Technologies, Inc.
 *   written by Ralf Baechle (ralf@linux-mips.org)
 *
 * Probe driver for the Malta's UART ports:
 *
 *   o 2 ports in the SMC SuperIO
 *   o 1 port in the CBUS UART, a discrete 16550 which normally is only used
 *     for bringups.
 *
 * We don't use 8250_platform.c on Malta as it would result in the CBUS
 * UART becoming ttyS0.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/serial_8250.h>

#define SMC_PORT(base, int)                                 \
{                                                     \
      .iobase           = base,                                   \
      .irq        = int,                                    \
      .uartclk    = 1843200,                          \
      .iotype           = UPIO_PORT,                              \
      .flags            = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,            \
      .regshift   = 0,                                \
}

#define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)

static struct plat_serial8250_port uart8250_data[] = {
      SMC_PORT(0x3F8, 4),
      SMC_PORT(0x2F8, 3),
      {
            .mapbase    = 0x1f000900,     /* The CBUS UART */
            .irq        = MIPS_CPU_IRQ_BASE + 2,
            .uartclk    = 3686400,  /* Twice the usual clk! */
            .iotype           = UPIO_MEM32,
            .flags            = CBUS_UART_FLAGS,
            .regshift   = 3,
      },
      { },
};

static struct platform_device uart8250_device = {
      .name             = "serial8250",
      .id               = PLAT8250_DEV_PLATFORM2,
      .dev              = {
            .platform_data    = uart8250_data,
      },
};

static int __init uart8250_init(void)
{
      return platform_device_register(&uart8250_device);
}

module_init(uart8250_init);

MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("8250 UART probe driver for the Malta CBUS UART");

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