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) 2007 MIPS Technologies, Inc.
   7  *   written by Ralf Baechle (ralf@linux-mips.org)
   8  *
   9  * Copyright (C) 2008 Wind River Systems, Inc.
  10  *   updated by Tiejun Chen <tiejun.chen@windriver.com>
  11  *
  12  * 1. Probe driver for the Malta's UART ports:
  13  *
  14  *   o 2 ports in the SMC SuperIO
  15  *   o 1 port in the CBUS UART, a discrete 16550 which normally is only used
  16  *     for bringups.
  17  *
  18  * We don't use 8250_platform.c on Malta as it would result in the CBUS
  19  * UART becoming ttyS0.
  20  *
  21  * 2. Register RTC-CMOS platform device on Malta.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/serial_8250.h>
  26 #include <linux/mc146818rtc.h>
  27 #include <linux/platform_device.h>
  28
  29 #define SMC_PORT(base, int)                                             \
  30 {                                                                       \
  31         .iobase         = base,                                         \
  32         .irq            = int,                                          \
  33         .uartclk        = 1843200,                                      \
  34         .iotype         = UPIO_PORT,                                    \
  35         .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,            \
  36         .regshift       = 0,                                            \
  37 }
  38
  39 #define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)
  40
  41 static struct plat_serial8250_port uart8250_data[] = {
  42         SMC_PORT(0x3F8, 4),
  43         SMC_PORT(0x2F8, 3),
  44         {
  45                 .mapbase        = 0x1f000900,   /* The CBUS UART */
  46                 .irq            = MIPS_CPU_IRQ_BASE + 2,
  47                 .uartclk        = 3686400,      /* Twice the usual clk! */
  48                 .iotype         = UPIO_MEM32,
  49                 .flags          = CBUS_UART_FLAGS,
  50                 .regshift       = 3,
  51         },
  52         { },
  53 };
  54
  55 static struct platform_device malta_uart8250_device = {
  56         .name                   = "serial8250",
  57         .id                     = PLAT8250_DEV_PLATFORM2,
  58         .dev                    = {
  59                 .platform_data  = uart8250_data,
  60         },
  61 };
  62
  63 struct resource malta_rtc_resources[] = {
  64         {
  65                 .start  = RTC_PORT(0),
  66                 .end    = RTC_PORT(7),
  67                 .flags  = IORESOURCE_IO,
  68         }, {
  69                 .start  = RTC_IRQ,
  70                 .end    = RTC_IRQ,
  71                 .flags  = IORESOURCE_IRQ,
  72         }
  73 };
  74
  75 static struct platform_device malta_rtc_device = {
  76         .name           = "rtc_cmos",
  77         .id             = -1,
  78         .resource       = malta_rtc_resources,
  79         .num_resources  = ARRAY_SIZE(malta_rtc_resources),
  80 };
  81
  82 static struct platform_device *malta_devices[] __initdata = {
  83         &malta_uart8250_device,
  84         &malta_rtc_device,
  85 };
  86
  87 static int __init malta_add_devices(void)
  88 {
  89         int err;
  90
  91         err = platform_add_devices(malta_devices, ARRAY_SIZE(malta_devices));
  92         if (err)
  93                 return err;
  94
  95         /*
  96          * Set RTC to BCD mode to support current alarm code.
  97          */
  98         CMOS_WRITE(CMOS_READ(RTC_CONTROL) & ~RTC_DM_BINARY, RTC_CONTROL);
  99
 100         return 0;
 101 }
 102
 103 device_initcall(malta_add_devices);