LXR linux/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
  41static 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
  54static struct platform_device uart8250_device = {
  55        .name = "serial8250",
  56        .id = PLAT8250_DEV_PLATFORM,
  57};
  58
  59static 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}
 111module_init(serial_init);
 112
 113static void __init serial_exit(void)
 114{
 115        platform_device_unregister(&uart8250_device);
 116}
 117module_exit(serial_exit);
 118