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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> |
#ifndef ia64 |
#include <arch/drivers/ns16550.h> |
#endif |
#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 port Virtual/IO address of device's registers. |
* @param inr Interrupt number. |
* @param cir Clear interrupt function. |
* @param cir_arg First argument to cir. |
*/ |
void |
ns16550_init(devno_t devno, ioport_t port, inr_t inr, cir_t cir, void *cir_arg) |
{ |
chardev_initialize("ns16550_kbd", &kbrd, &ops); |
stdin = &kbrd; |
|
ns16550.devno = devno; |
ns16550.io_port = port; |
|
irq_initialize(&ns16550_irq); |
ns16550_irq.devno = devno; |
ns16550_irq.inr = inr; |
ns16550_irq.claim = ns16550_claim; |
ns16550_irq.handler = ns16550_irq_handler; |
ns16550_irq.cir = cir; |
ns16550_irq.cir_arg = cir_arg; |
irq_register(&ns16550_irq); |
|
|
while ((ns16550_lsr_read(&ns16550) & LSR_DATA_READY)) |
ns16550_rbr_read(&ns16550); |
|
|
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, port); |
sysinfo_set_item_val("kbd.port", NULL, port); |
|
#ifdef CONFIG_NS16550_INTERRUPT_DRIVEN |
/* Enable interrupts */ |
ns16550_ier_write(&ns16550, IER_ERBFI); |
ns16550_mcr_write(&ns16550, MCR_OUT2); |
#endif |
|
#ifdef ia64 |
uint8_t c; |
// This switches rbr & ier to mode when accept baudrate constant |
c = ns16550_lcr_read(&ns16550); |
ns16550_lcr_write(&ns16550, 0x80 | c); |
ns16550_rbr_write(&ns16550, 0x0c); |
ns16550_ier_write(&ns16550, 0x00); |
ns16550_lcr_write(&ns16550, c); |
#endif |
|
ns16550_grab(); |
} |
|
/** Process ns16550 interrupt. */ |
void ns16550_interrupt(void) |
{ |
ns16550_poll(); |
} |
|
/* 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); |
#ifndef ia64 |
if (x != IGNORE_CODE) { |
if (x & KEY_RELEASE) |
key_released(x ^ KEY_RELEASE); |
else |
active_read_key_pressed(x); |
} |
#else |
extern chardev_t kbrd; |
if(x != 0x0d) { |
if(x == 0x7f) |
x = '\b'; |
chardev_push_character(&kbrd, x); |
} |
#endif |
|
} |
return ch; |
} |
|
/** Poll for key press and release events. |
* |
* This function can be used to implement keyboard polling. |
*/ |
void ns16550_poll(void) |
{ |
#ifndef CONFIG_NS16550_INTERRUPT_DRIVEN |
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); |
#endif |
|
while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) { |
uint8_t x; |
|
x = ns16550_rbr_read(&ns16550); |
#ifndef ia64 |
if (x != IGNORE_CODE) { |
if (x & KEY_RELEASE) |
key_released(x ^ KEY_RELEASE); |
else |
key_pressed(x); |
} |
#else |
extern chardev_t kbrd; |
if(x != 0x0d) { |
if (x == 0x7f) |
x = '\b'; |
chardev_push_character(&kbrd, x); |
} |
#endif |
|
} |
} |
|
irq_ownership_t ns16550_claim(void) |
{ |
return (ns16550_lsr_read(&ns16550) & LSR_DATA_READY); |
} |
|
void ns16550_irq_handler(irq_t *irq, void *arg, ...) |
{ |
if (irq->notif_cfg.notify && irq->notif_cfg.answerbox) |
ipc_irq_send_notif(irq); |
else |
ns16550_interrupt(); |
} |
|
/** @} |
*/ |