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* Copyright (c) 2006 Josef Cejka
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/** @addtogroup kbd_port
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* @brief NS16550 port driver.
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/* NS16550 registers */
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#define RBR_REG 0 /** Receiver Buffer Register. */
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#define IER_REG 1 /** Interrupt Enable Register. */
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#define IIR_REG 2 /** Interrupt Ident Register (read). */
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#define FCR_REG 2 /** FIFO control register (write). */
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#define LCR_REG 3 /** Line Control register. */
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#define MCR_REG 4 /** Modem Control Register. */
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#define LSR_REG 5 /** Line Status Register. */
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#define LSR_DATA_READY 0x01
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static irq_cmd_t ns16550_cmds[] = {
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.cmd = CMD_PIO_READ_8,
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.addr = (void *) 0, /* will be patched in run-time */
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.value = LSR_DATA_READY,
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.cmd = CMD_PIO_READ_8,
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.addr = (void *) 0, /* will be patched in run-time */
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irq_code_t ns16550_kbd = {
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sizeof(ns16550_cmds) / sizeof(irq_cmd_t),
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static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call);
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static uintptr_t ns16550_physical;
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static uintptr_t ns16550_kernel;
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int ns16550_port_init(void)
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async_set_interrupt_received(ns16550_irq_handler);
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ns16550_physical = sysinfo_value("kbd.address.physical");
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ns16550_kernel = sysinfo_value("kbd.address.kernel");
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ns16550_kbd.cmds[0].addr = (void *) (ns16550_kernel + LSR_REG);
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ns16550_kbd.cmds[3].addr = (void *) (ns16550_kernel + RBR_REG);
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ipc_register_irq(sysinfo_value("kbd.inr"), device_assign_devno(),
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sysinfo_value("kbd.inr"), &ns16550_kbd);
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return pio_enable((void *) ns16550_physical, 8, &vaddr);
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void ns16550_port_yield(void)
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void ns16550_port_reclaim(void)
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static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call)
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int scan_code = IPC_GET_ARG2(*call);
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kbd_push_scancode(scan_code);
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async_msg_1(cir_phone, BUS_CLEAR_INTERRUPT,
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IPC_GET_METHOD(*call));