serial.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:5k
- /*
- * FILE NAME
- * arch/mips/vr41xx/common/serial.c
- *
- * BRIEF MODULE DESCRIPTION
- * Serial Interface Unit routines for NEC VR4100 series.
- *
- * Author: Yoichi Yuasa
- * yyuasa@mvista.com or source@mvista.com
- *
- * Copyright 2002 MontaVista Software Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
- * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*
- * Changes:
- * MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
- * - Added support for NEC VR4111 and VR4121.
- *
- * MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
- * - New creation, NEC VR4122 and VR4131 are supported.
- */
- #include <linux/init.h>
- #include <linux/types.h>
- #include <linux/serial.h>
- #include <asm/addrspace.h>
- #include <asm/cpu.h>
- #include <asm/io.h>
- #include <asm/vr41xx/vr41xx.h>
- /* VR4111 and VR4121 SIU Registers */
- #define VR4111_SIURB KSEG1ADDR(0x0c000000)
- #define VR4111_SIUIRSEL KSEG1ADDR(0x0c000008)
- /* VR4122 and VR4131 SIU Registers */
- #define VR4122_SIURB KSEG1ADDR(0x0f000800)
- #define VR4122_SIUIRSEL KSEG1ADDR(0x0f000808)
- #define USE_RS232C 0x00
- #define USE_IRDA 0x01
- #define SIU_USES_IRDA 0x00
- #define FIR_USES_IRDA 0x02
- #define IRDA_MODULE_SHARP 0x00
- #define IRDA_MODULE_TEMIC 0x04
- #define IRDA_MODULE_HP 0x08
- #define TMICTX 0x10
- #define TMICMODE 0x20
- #define SIU_BASE_BAUD 1152000
- #define SIU_CLOCK 0x0102
- #define SIU_IRQ 17
- /* VR4122 and VR4131 DSIU Registers */
- #define DSIURB KSEG1ADDR(0x0f000820)
- #define MDSIUINTREG KSEG1ADDR(0x0f000096)
- #define INTDSIU 0x0800
- #define DSIU_BASE_BAUD 1152000
- #define DSIU_CLOCK 0x0802
- #define DSIU_IRQ 29
- int vr41xx_serial_ports = 0;
- void vr41xx_siu_ifselect(int interface, int module)
- {
- u16 val = USE_RS232C; /* Select RS-232C */
- /* Select IrDA */
- if (interface == SIU_IRDA) {
- switch (module) {
- case IRDA_SHARP:
- val = IRDA_MODULE_SHARP;
- break;
- case IRDA_TEMIC:
- val = IRDA_MODULE_TEMIC;
- break;
- case IRDA_HP:
- val = IRDA_MODULE_HP;
- break;
- }
- val |= USE_IRDA | SIU_USES_IRDA;
- }
- switch (mips_cpu.cputype) {
- case CPU_VR4111:
- case CPU_VR4121:
- writew(val, VR4111_SIUIRSEL);
- break;
- case CPU_VR4122:
- case CPU_VR4131:
- writew(val, VR4122_SIUIRSEL);
- break;
- default:
- printk(KERN_INFO "Unexpected CPU of NEC VR4100 seriesn");
- break;
- }
- }
- void __init vr41xx_siu_init(int interface, int module)
- {
- struct serial_struct s;
- vr41xx_siu_ifselect(interface, module);
- memset(&s, 0, sizeof(s));
- s.line = vr41xx_serial_ports;
- s.baud_base = SIU_BASE_BAUD;
- s.irq = SIU_IRQ;
- s.flags = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST;
- switch (mips_cpu.cputype) {
- case CPU_VR4111:
- case CPU_VR4121:
- s.iomem_base = (unsigned char *)VR4111_SIURB;
- break;
- case CPU_VR4122:
- case CPU_VR4131:
- s.iomem_base = (unsigned char *)VR4122_SIURB;
- break;
- default:
- panic("Unexpected CPU of NEC VR4100 series");
- break;
- }
- s.iomem_reg_shift = 0;
- s.io_type = SERIAL_IO_MEM;
- if (early_serial_setup(&s) != 0)
- printk(KERN_ERR "SIU setup failed!n");
- vr41xx_clock_supply(SIU_CLOCK);
- vr41xx_serial_ports++;
- }
- void __init vr41xx_dsiu_init(void)
- {
- struct serial_struct s;
- if (mips_cpu.cputype != CPU_VR4122 && mips_cpu.cputype != CPU_VR4131)
- return;
- memset(&s, 0, sizeof(s));
- s.line = vr41xx_serial_ports;
- s.baud_base = DSIU_BASE_BAUD;
- s.irq = DSIU_IRQ;
- s.flags = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST;
- s.iomem_base = (unsigned char *)DSIURB;
- s.iomem_reg_shift = 0;
- s.io_type = SERIAL_IO_MEM;
- if (early_serial_setup(&s) != 0)
- printk(KERN_ERR "DSIU setup failed!n");
- vr41xx_clock_supply(DSIU_CLOCK);
- writew(INTDSIU, MDSIUINTREG);
- vr41xx_serial_ports++;
- }