WebSVN – HelenOS – Diff – /branches/dynload/kernel/genarch/src/drivers/ns16550/ns16550.c


/*
 * Copyright (c) 2009 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 controller driver.
 */
 
#include <genarch/drivers/ns16550/ns16550.h>
#include <ddi/irq.h>
#include <arch/asm.h>
#include <console/chardev.h>
#include <mm/slab.h>
 
#define LSR_DATA_READY  0x01
 
static indev_operations_t kbrdin_ops = {
    .poll = NULL
};
 
static irq_ownership_t ns16550_claim(irq_t *irq)
{
    ns16550_instance_t *instance = irq->instance;
    ns16550_t *dev = instance->ns16550;
   
    if (pio_read_8(&dev->lsr) & LSR_DATA_READY)
        return IRQ_ACCEPT;
    else
        return IRQ_DECLINE;
}
 
static void ns16550_irq_handler(irq_t *irq)
{
    ns16550_instance_t *instance = irq->instance;
    ns16550_t *dev = instance->ns16550;
   
    if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {
        uint8_t x = pio_read_8(&dev->rbr);
        indev_push_character(&instance->kbrdin, x);
    }
}
 
/** Initialize ns16550.
 *
 * @param dev      Addrress of the beginning of the device in I/O space.
 * @param devno    Device number.
 * @param inr      Interrupt number.
 * @param cir      Clear interrupt function.
 * @param cir_arg  First argument to cir.
 *
 * @return Keyboard device pointer or NULL on failure.
 *
 */
indev_t *ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg)
{
    ns16550_instance_t *instance
        = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);
    if (!instance)
        return NULL;
   
    indev_initialize("ns16550", &instance->kbrdin, &kbrdin_ops);
   
    instance->devno = devno;
    instance->ns16550 = dev;
   
    irq_initialize(&instance->irq);
    instance->irq.devno = devno;
    instance->irq.inr = inr;
    instance->irq.claim = ns16550_claim;
    instance->irq.handler = ns16550_irq_handler;
    instance->irq.instance = instance;
    instance->irq.cir = cir;
    instance->irq.cir_arg = cir_arg;
    irq_register(&instance->irq);
   
    while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))
        (void) pio_read_8(&dev->rbr);
   
    /* Enable interrupts */
    pio_write_8(&dev->ier, IER_ERBFI);
    pio_write_8(&dev->mcr, MCR_OUT2);
   
    return &instance->kbrdin;
}
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/branches/dynload/kernel/genarch/src/drivers/ns16550/ns16550.c @ 4347 – Rev 4119 → 4346

Rev 4119		Rev 4346
1	/*	1	/*
2	* Copyright (c) 2009 Jakub Jermar	2	* Copyright (c) 2009 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup genarch	29	/** @addtogroup genarch
30	* @{	30	* @{
31	*/	31	*/
32	/**	32	/**
33	* @file	33	* @file
34	* @brief NS 16550 serial controller driver.	34	* @brief NS 16550 serial controller driver.
35	*/	35	*/
36		36
37	#include <genarch/drivers/ns16550/ns16550.h>	37	#include <genarch/drivers/ns16550/ns16550.h>
38	#include <ddi/irq.h>	38	#include <ddi/irq.h>
39	#include <arch/asm.h>	39	#include <arch/asm.h>
40	#include <console/chardev.h>	40	#include <console/chardev.h>
41	#include <mm/slab.h>	41	#include <mm/slab.h>
42		42
43	#define LSR_DATA_READY 0x01	43	#define LSR_DATA_READY 0x01
44		44
45	static indev_operations_t kbrdin_ops = {	45	static indev_operations_t kbrdin_ops = {
46	.poll = NULL	46	.poll = NULL
47	};	47	};
48		48
49	static irq_ownership_t ns16550_claim(irq_t *irq)	49	static irq_ownership_t ns16550_claim(irq_t *irq)
50	{	50	{
51	ns16550_instance_t *instance = irq->instance;	51	ns16550_instance_t *instance = irq->instance;
52	ns16550_t *dev = instance->ns16550;	52	ns16550_t *dev = instance->ns16550;
53		53
54	if (pio_read_8(&dev->lsr) & LSR_DATA_READY)	54	if (pio_read_8(&dev->lsr) & LSR_DATA_READY)
55	return IRQ_ACCEPT;	55	return IRQ_ACCEPT;
56	else	56	else
57	return IRQ_DECLINE;	57	return IRQ_DECLINE;
58	}	58	}
59		59
60	static void ns16550_irq_handler(irq_t *irq)	60	static void ns16550_irq_handler(irq_t *irq)
61	{	61	{
62	ns16550_instance_t *instance = irq->instance;	62	ns16550_instance_t *instance = irq->instance;
63	ns16550_t *dev = instance->ns16550;	63	ns16550_t *dev = instance->ns16550;
64		64
65	if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {	65	if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {
66	uint8_t x = pio_read_8(&dev->rbr);	66	uint8_t x = pio_read_8(&dev->rbr);
67	indev_push_character(&instance->kbrdin, x);	67	indev_push_character(&instance->kbrdin, x);
68	}	68	}
69	}	69	}
70		70
71	/** Initialize ns16550.	71	/** Initialize ns16550.
72	*	72	*
73	* @param dev Addrress of the beginning of the device in I/O space.	73	* @param dev Addrress of the beginning of the device in I/O space.
74	* @param devno Device number.	74	* @param devno Device number.
75	* @param inr Interrupt number.	75	* @param inr Interrupt number.
76	* @param cir Clear interrupt function.	76	* @param cir Clear interrupt function.
77	* @param cir_arg First argument to cir.	77	* @param cir_arg First argument to cir.
78	*	78	*
79	* @return Keyboard device pointer or NULL on failure.	79	* @return Keyboard device pointer or NULL on failure.
80	*	80	*
81	*/	81	*/
82	indev_t ns16550_init(ns16550_t dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg)	82	indev_t ns16550_init(ns16550_t dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg)
83	{	83	{
84	ns16550_instance_t *instance	84	ns16550_instance_t *instance
85	= malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);	85	= malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);
86	if (!instance)	86	if (!instance)
87	return NULL;	87	return NULL;
88		88
89	indev_initialize("ns16550", &instance->kbrdin, &kbrdin_ops);	89	indev_initialize("ns16550", &instance->kbrdin, &kbrdin_ops);
90		90
91	instance->devno = devno;	91	instance->devno = devno;
92	instance->ns16550 = dev;	92	instance->ns16550 = dev;
93		93
94	irq_initialize(&instance->irq);	94	irq_initialize(&instance->irq);
95	instance->irq.devno = devno;	95	instance->irq.devno = devno;
96	instance->irq.inr = inr;	96	instance->irq.inr = inr;
97	instance->irq.claim = ns16550_claim;	97	instance->irq.claim = ns16550_claim;
98	instance->irq.handler = ns16550_irq_handler;	98	instance->irq.handler = ns16550_irq_handler;
99	instance->irq.instance = instance;	99	instance->irq.instance = instance;
100	instance->irq.cir = cir;	100	instance->irq.cir = cir;
101	instance->irq.cir_arg = cir_arg;	101	instance->irq.cir_arg = cir_arg;
102	irq_register(&instance->irq);	102	irq_register(&instance->irq);
103		103
104	while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))	104	while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))
105	(void) pio_read_8(&dev->rbr);	105	(void) pio_read_8(&dev->rbr);
106		106
107	/* Enable interrupts */	107	/* Enable interrupts */
108	pio_write_8(&dev->ier, IER_ERBFI);	108	pio_write_8(&dev->ier, IER_ERBFI);
109	pio_write_8(&dev->mcr, MCR_OUT2);	109	pio_write_8(&dev->mcr, MCR_OUT2);
110		110
111	return &instance->kbrdin;	111	return &instance->kbrdin;
112	}	112	}
113		113
114	/** @}	114	/** @}
115	*/	115	*/
116		116