arch/mips/loongson/common/serial.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  * Copyright (C) 2009 Lemote, Inc.
   9  * Author: Yan hua (yanhua@lemote.com)
  10  * Author: Wu Zhangjin (wuzhangjin@gmail.com)
  11  */
  12
  13 #include <linux/io.h>
  14 #include <linux/init.h>
  15 #include <linux/serial_8250.h>
  16
  17 #include <asm/bootinfo.h>
  18
  19 #include <loongson.h>
  20 #include <machine.h>
  21
  22 #define PORT(int, clk)                  \
  23 {                                                               \
  24         .irq            = int,                                  \
  25         .uartclk        = clk,                                  \
  26         .iotype         = UPIO_PORT,                            \
  27         .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,    \
  28         .regshift       = 0,                                    \
  29 }
  30
  31 #define PORT_M(int, clk)                                \
  32 {                                                               \
  33         .irq            = MIPS_CPU_IRQ_BASE + (int),            \
  34         .uartclk        = clk,                                  \
  35         .iotype         = UPIO_MEM,                             \
  36         .membase        = (void __iomem *)NULL,                 \
  37         .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,    \
  38         .regshift       = 0,                                    \
  39 }
  40
  41 static struct plat_serial8250_port uart8250_data[][2] = {
  42         [MACH_LOONGSON_UNKNOWN]         {},
  43         [MACH_LEMOTE_FL2E]              {PORT(4, 1843200), {} },
  44         [MACH_LEMOTE_FL2F]              {PORT(3, 1843200), {} },
  45         [MACH_LEMOTE_ML2F7]             {PORT_M(3, 3686400), {} },
  46         [MACH_LEMOTE_YL2F89]            {PORT_M(3, 3686400), {} },
  47         [MACH_DEXXON_GDIUM2F10]         {PORT_M(3, 3686400), {} },
  48         [MACH_LEMOTE_NAS]               {PORT_M(3, 3686400), {} },
  49         [MACH_LEMOTE_LL2F]              {PORT(3, 1843200), {} },
  50         [MACH_LEMOTE_A1004]             {PORT_M(2, 33177600), {} },
  51         [MACH_LEMOTE_A1101]             {PORT_M(2, 25000000), {} },
  52         [MACH_LEMOTE_A1201]             {PORT_M(2, 25000000), {} },
  53         [MACH_LEMOTE_A1205]             {PORT_M(2, 25000000), {} },
  54         [MACH_LOONGSON_END]             {},
  55 };
  56
  57 static struct platform_device uart8250_device = {
  58         .name = "serial8250",
  59         .id = PLAT8250_DEV_PLATFORM,
  60 };
  61
  62 static int __init serial_init(void)
  63 {
  64         unsigned char iotype;
  65
  66         iotype = uart8250_data[mips_machtype][0].iotype;
  67
  68         if (UPIO_MEM == iotype)
  69                 uart8250_data[mips_machtype][0].membase =
  70                         (void __iomem *)_loongson_uart_base;
  71         else if (UPIO_PORT == iotype)
  72                 uart8250_data[mips_machtype][0].iobase =
  73                     loongson_uart_base - LOONGSON_PCIIO_BASE;
  74
  75         uart8250_device.dev.platform_data = uart8250_data[mips_machtype];
  76
  77         return platform_device_register(&uart8250_device);
  78 }
  79
  80 device_initcall(serial_init);