arch/mips/loongson64/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/module.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[][MAX_UARTS + 1] = {
  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_LOONGSON_GENERIC] = {PORT_M(2, 25000000), {} },
  51         [MACH_LOONGSON_END]     = {},
  52 };
  53
  54 static struct platform_device uart8250_device = {
  55         .name = "serial8250",
  56         .id = PLAT8250_DEV_PLATFORM,
  57 };
  58
  59 static int __init serial_init(void)
  60 {
  61         int i;
  62         unsigned char iotype;
  63
  64         iotype = uart8250_data[mips_machtype][0].iotype;
  65
  66         if (UPIO_MEM == iotype) {
  67                 uart8250_data[mips_machtype][0].mapbase =
  68                         loongson_uart_base[0];
  69                 uart8250_data[mips_machtype][0].membase =
  70                         (void __iomem *)_loongson_uart_base[0];
  71         }
  72         else if (UPIO_PORT == iotype)
  73                 uart8250_data[mips_machtype][0].iobase =
  74                         loongson_uart_base[0] - LOONGSON_PCIIO_BASE;
  75
  76         if (loongson_sysconf.uarts[0].uartclk)
  77                 uart8250_data[mips_machtype][0].uartclk =
  78                         loongson_sysconf.uarts[0].uartclk;
  79
  80         for (i = 1; i < loongson_sysconf.nr_uarts; i++) {
  81                 iotype = loongson_sysconf.uarts[i].iotype;
  82                 uart8250_data[mips_machtype][i].iotype = iotype;
  83                 loongson_uart_base[i] = loongson_sysconf.uarts[i].uart_base;
  84
  85                 if (UPIO_MEM == iotype) {
  86                         uart8250_data[mips_machtype][i].irq =
  87                                 MIPS_CPU_IRQ_BASE + loongson_sysconf.uarts[i].int_offset;
  88                         uart8250_data[mips_machtype][i].mapbase =
  89                                 loongson_uart_base[i];
  90                         uart8250_data[mips_machtype][i].membase =
  91                                 ioremap_nocache(loongson_uart_base[i], 8);
  92                 } else if (UPIO_PORT == iotype) {
  93                         uart8250_data[mips_machtype][i].irq =
  94                                 loongson_sysconf.uarts[i].int_offset;
  95                         uart8250_data[mips_machtype][i].iobase =
  96                                 loongson_uart_base[i] - LOONGSON_PCIIO_BASE;
  97                 }
  98
  99                 uart8250_data[mips_machtype][i].uartclk =
 100                         loongson_sysconf.uarts[i].uartclk;
 101                 uart8250_data[mips_machtype][i].flags =
 102                         UPF_BOOT_AUTOCONF | UPF_SKIP_TEST;
 103         }
 104
 105         memset(&uart8250_data[mips_machtype][loongson_sysconf.nr_uarts],
 106                         0, sizeof(struct plat_serial8250_port));
 107         uart8250_device.dev.platform_data = uart8250_data[mips_machtype];
 108
 109         return platform_device_register(&uart8250_device);
 110 }
 111 module_init(serial_init);
 112
 113 static void __init serial_exit(void)
 114 {
 115         platform_device_unregister(&uart8250_device);
 116 }
 117 module_exit(serial_exit);