serial.h
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上传日期:2013-04-10
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- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1999 by Ralf Baechle
- * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
- */
- #ifndef _ASM_SERIAL_H
- #define _ASM_SERIAL_H
- #include <linux/config.h>
- /*
- * This assumes you have a 1.8432 MHz clock for your UART.
- *
- * It'd be nice if someone built a serial card with a 24.576 MHz
- * clock, since the 16550A is capable of handling a top speed of 1.5
- * megabits/second; but this requires the faster clock.
- */
- #define BASE_BAUD (1843200 / 16)
- #ifdef CONFIG_HAVE_STD_PC_SERIAL_PORT
- /* Standard COM flags (except for COM4, because of the 8514 problem) */
- #ifdef CONFIG_SERIAL_DETECT_IRQ
- #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ)
- #define STD_COM4_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_AUTO_IRQ)
- #else
- #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
- #define STD_COM4_FLAGS ASYNC_BOOT_AUTOCONF
- #endif
- #define STD_SERIAL_PORT_DEFNS
- /* UART CLK PORT IRQ FLAGS */
- { 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS }, /* ttyS0 */
- { 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS }, /* ttyS1 */
- { 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS }, /* ttyS2 */
- { 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS }, /* ttyS3 */
- #else /* CONFIG_HAVE_STD_PC_SERIAL_PORTS */
- #define STD_SERIAL_PORT_DEFNS
- #endif /* CONFIG_HAVE_STD_PC_SERIAL_PORTS */
- #ifdef CONFIG_MIPS_SEAD
- #include <asm/mips-boards/sead.h>
- #include <asm/mips-boards/seadint.h>
- #define SEAD_SERIAL_PORT_DEFNS
- /* UART CLK PORT IRQ FLAGS */
- { 0, SEAD_BASE_BAUD, SEAD_UART0_REGS_BASE, SEADINT_UART0, STD_COM_FLAGS }, /* ttyS0 */
- #else
- #define SEAD_SERIAL_PORT_DEFNS
- #endif
- #ifdef CONFIG_SGI_IP27
- /*
- * Note about serial ports and consoles:
- * For console output, everyone uses the IOC3 UARTA (offset 0x178)
- * connected to the master node (look in ip27_setup_console() and
- * ip27prom_console_write()).
- *
- * For serial (/dev/ttyS0 etc), we can not have hardcoded serial port
- * addresses on a partitioned machine. Since we currently use the ioc3
- * serial ports, we use dynamic serial port discovery that the serial.c
- * driver uses for pci/pnp ports (there is an entry for the SGI ioc3
- * boards in pci_boards[]). Unfortunately, UARTA's pio address is greater
- * than UARTB's, although UARTA on o200s has traditionally been known as
- * port 0. So, we just use one serial port from each ioc3 (since the
- * serial driver adds addresses to get to higher ports).
- *
- * The first one to do a register_console becomes the preferred console
- * (if there is no kernel command line console= directive). /dev/console
- * (ie 5, 1) is then "aliased" into the device number returned by the
- * "device" routine referred to in this console structure
- * (ip27prom_console_dev).
- *
- * Also look in ip27-pci.c:pci_fixuop_ioc3() for some comments on working
- * around ioc3 oddities in this respect.
- *
- * The IOC3 serials use a 22MHz clock rate with an additional divider by 3.
- * (IOC3_BAUD = (22000000 / (3*16)))
- *
- * At the moment this is only a skeleton definition as we register all serials
- * at runtime.
- */
- #define IP27_SERIAL_PORT_DEFNS
- #else
- #define IP27_SERIAL_PORT_DEFNS
- #endif /* CONFIG_SGI_IP27 */
- #ifdef CONFIG_SGI_IP32
- #include <asm/ip32/ip32_ints.h>
- /*
- * The IP32 (SGI O2) has standard serial ports (UART 16550A) mapped in memory
- */
- /* Standard COM flags (except for COM4, because of the 8514 problem) */
- #ifdef CONFIG_SERIAL_DETECT_IRQ
- #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ)
- #define STD_COM4_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_AUTO_IRQ)
- #else
- #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF/* | ASYNC_SKIP_TEST*/)
- #define STD_COM4_FLAGS ASYNC_BOOT_AUTOCONF
- #endif
- #define IP32_SERIAL_PORT_DEFNS
- { baud_base: BASE_BAUD,
- irq: MACEISA_SERIAL1_IRQ,
- flags: STD_COM_FLAGS,
- iomem_base: (u8*)MACE_BASE+MACEISA_SER1_BASE,
- iomem_reg_shift: 8,
- io_type: SERIAL_IO_MEM},
- { baud_base: BASE_BAUD,
- irq: MACEISA_SERIAL2_IRQ,
- flags: STD_COM_FLAGS,
- iomem_base: (u8*)MACE_BASE+MACEISA_SER2_BASE,
- iomem_reg_shift: 8,
- io_type: SERIAL_IO_MEM},
- #else
- #define IP32_SERIAL_PORT_DEFNS
- #endif /* CONFIG_SGI_IP31 */
- #define SERIAL_PORT_DFNS
- IP27_SERIAL_PORT_DEFNS
- IP32_SERIAL_PORT_DEFNS
- SEAD_SERIAL_PORT_DEFNS
- STD_SERIAL_PORT_DEFNS
- #define RS_TABLE_SIZE 64
- #endif /* _ASM_SERIAL_H */