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| /* |
| * Copyright (c) 2001-2006 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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. |
| */ |
| |
| /** @addtogroup genarch |
| * @{ |
| */ |
| /** |
| * @file |
| * @brief NS 16550 serial port / keyboard driver. |
| */ |
| |
| #include <genarch/kbd/ns16550.h> |
| #include <genarch/kbd/key.h> |
| #include <genarch/kbd/scanc.h> |
| #include <genarch/kbd/scanc_sun.h> |
| #include <arch/drivers/kbd.h> |
| #include <arch/drivers/ns16550.h> |
| #include <ddi/irq.h> |
| #include <ipc/irq.h> |
| #include <cpu.h> |
| #include <arch/asm.h> |
| #include <arch.h> |
| #include <console/chardev.h> |
| #include <console/console.h> |
| #include <interrupt.h> |
| #include <arch/interrupt.h> |
| #include <sysinfo/sysinfo.h> |
| #include <synch/spinlock.h> |
| |
| #define LSR_DATA_READY 0x01 |
| |
| /** Structure representing the ns16550. */ |
| static ns16550_t ns16550; |
| |
| /** Structure for ns16550's IRQ. */ |
| static irq_t ns16550_irq; |
| |
| /* |
| * These codes read from ns16550 data register are silently ignored. |
| */ |
| #define IGNORE_CODE 0x7f /* all keys up */ |
| |
| static void ns16550_suspend(chardev_t *); |
| static void ns16550_resume(chardev_t *); |
| |
| static chardev_operations_t ops = { |
| .suspend = ns16550_suspend, |
| .resume = ns16550_resume, |
| .read = ns16550_key_read |
| }; |
| |
| void ns16550_interrupt(void); |
| |
| /** Initialize keyboard and service interrupts using kernel routine */ |
| void ns16550_grab(void) |
| { |
| ipl_t ipl = interrupts_disable(); |
| |
| ns16550_ier_write(&ns16550, IER_ERBFI); /* enable receiver interrupt */ |
| |
| while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) |
| (void) ns16550_rbr_read(&ns16550); |
| |
| spinlock_lock(&ns16550_irq.lock); |
| ns16550_irq.notif_cfg.notify = false; |
| spinlock_unlock(&ns16550_irq.lock); |
| interrupts_restore(ipl); |
| } |
| |
| /** Resume the former interrupt vector */ |
| void ns16550_release(void) |
| { |
| ipl_t ipl = interrupts_disable(); |
| spinlock_lock(&ns16550_irq.lock); |
| if (ns16550_irq.notif_cfg.answerbox) |
| ns16550_irq.notif_cfg.notify = true; |
| spinlock_unlock(&ns16550_irq.lock); |
| interrupts_restore(ipl); |
| } |
| |
| /** Initialize ns16550. |
| * |
| * @param devno Device number. |
| * @param inr Interrupt number. |
| * @param vaddr Virtual address of device's registers. |
| */ |
| void ns16550_init(devno_t devno, inr_t inr, uintptr_t vaddr) |
| { |
| chardev_initialize("ns16550_kbd", &kbrd, &ops); |
| stdin = &kbrd; |
| |
| ns16550.devno = devno; |
| ns16550.reg = (uint8_t *) vaddr; |
| |
| irq_initialize(&ns16550_irq); |
| ns16550_irq.devno = devno; |
| ns16550_irq.inr = inr; |
| ns16550_irq.claim = ns16550_claim; |
| ns16550_irq.handler = ns16550_irq_handler; |
| irq_register(&ns16550_irq); |
| |
| sysinfo_set_item_val("kbd", NULL, true); |
| sysinfo_set_item_val("kbd.type", NULL, KBD_NS16550); |
| sysinfo_set_item_val("kbd.devno", NULL, devno); |
| sysinfo_set_item_val("kbd.inr", NULL, inr); |
| sysinfo_set_item_val("kbd.address.virtual", NULL, vaddr); |
| |
| ns16550_grab(); |
| } |
| |
| /** Process ns16550 interrupt. */ |
| void ns16550_interrupt(void) |
| { |
| /* TODO |
| * |
| * ns16550 works in the polled mode so far. |
| */ |
| } |
| |
| /* Called from getc(). */ |
| void ns16550_resume(chardev_t *d) |
| { |
| } |
| |
| /* Called from getc(). */ |
| void ns16550_suspend(chardev_t *d) |
| { |
| } |
| |
| char ns16550_key_read(chardev_t *d) |
| { |
| char ch; |
| |
| while(!(ch = active_read_buff_read())) { |
| uint8_t x; |
| while (!(ns16550_lsr_read(&ns16550) & LSR_DATA_READY)) |
| ; |
| x = ns16550_rbr_read(&ns16550); |
| if (x != IGNORE_CODE) { |
| if (x & KEY_RELEASE) |
| key_released(x ^ KEY_RELEASE); |
| else |
| active_read_key_pressed(x); |
| } |
| } |
| return ch; |
| } |
| |
| /** Poll for key press and release events. |
| * |
| * This function can be used to implement keyboard polling. |
| */ |
| void ns16550_poll(void) |
| { |
| ipl_t ipl; |
| |
| ipl = interrupts_disable(); |
| spinlock_lock(&ns16550_irq.lock); |
| |
| if (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) { |
| if (ns16550_irq.notif_cfg.notify && ns16550_irq.notif_cfg.answerbox) { |
| /* |
| * Send IPC notification. |
| */ |
| ipc_irq_send_notif(&ns16550_irq); |
| spinlock_unlock(&ns16550_irq.lock); |
| interrupts_restore(ipl); |
| return; |
| } |
| } |
| |
| spinlock_unlock(&ns16550_irq.lock); |
| interrupts_restore(ipl); |
| |
| while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) { |
| uint8_t x; |
| |
| x = ns16550_rbr_read(&ns16550); |
| if (x != IGNORE_CODE) { |
| if (x & KEY_RELEASE) |
| key_released(x ^ KEY_RELEASE); |
| else |
| key_pressed(x); |
| } |
| } |
| } |
| |
| irq_ownership_t ns16550_claim(void) |
| { |
| return (ns16550_lsr_read(&ns16550) & LSR_DATA_READY); |
| } |
| |
| void ns16550_irq_handler(irq_t *irq, void *arg, ...) |
| { |
| panic("Not yet implemented, ns16550 works in polled mode.\n"); |
| } |
| |
| /** @} |
| */ |