WebSVN – HelenOS – Diff – /branches/dd/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
 
/** 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.
 * @param devout    Output character device.
 *
 * @return      True on success, false on failure.
 */
bool
ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg,
    chardev_t *devout)
{
    ns16550_instance_t *instance;
   
    instance = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);
    if (!instance)
        return false;
 
    instance->devno = devno;
    instance->ns16550 = dev;
    instance->devout = devout;
   
    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 true;
}
 
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;
}
 
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;
       
        x = pio_read_8(&dev->rbr);
        if (instance->devout)
            chardev_push_character(instance->devout, x);
    }
}
 
/** @}
 */
 

Rev 4042	Rev 4055
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	/** Initialize ns16550.	45	/** Initialize ns16550.
46	*	46	*
47	* @param dev Addrress of the beginning of the device in I/O space.	47	* @param dev Addrress of the beginning of the device in I/O space.
48	* @param devno Device number.	48	* @param devno Device number.
49	* @param inr Interrupt number.	49	* @param inr Interrupt number.
50	* @param cir Clear interrupt function.	50	* @param cir Clear interrupt function.
51	* @param cir_arg First argument to cir.	51	* @param cir_arg First argument to cir.
52	* @param devout Output character device.	52	* @param devout Output character device.
53	*	53	*
54	* @return True on success, false on failure.	54	* @return True on success, false on failure.
55	*/	55	*/
56	bool	56	bool
57	ns16550_init(ns16550_t dev, devno_t devno, inr_t inr, cir_t cir, void cir_arg,	57	ns16550_init(ns16550_t dev, devno_t devno, inr_t inr, cir_t cir, void cir_arg,
58	chardev_t *devout)	58	chardev_t *devout)
59	{	59	{
60	ns16550_instance_t *instance;	60	ns16550_instance_t *instance;
61		61
62	instance = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);	62	instance = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);
63	if (!instance)	63	if (!instance)
64	return false;	64	return false;
65		65
66	instance->devno = devno;	66	instance->devno = devno;
67	instance->ns16550 = dev;	67	instance->ns16550 = dev;
68	instance->devout = devout;	68	instance->devout = devout;
69		69
70	irq_initialize(&instance->irq);	70	irq_initialize(&instance->irq);
71	instance->irq.devno = devno;	71	instance->irq.devno = devno;
72	instance->irq.inr = inr;	72	instance->irq.inr = inr;
73	instance->irq.claim = ns16550_claim;	73	instance->irq.claim = ns16550_claim;
74	instance->irq.handler = ns16550_irq_handler;	74	instance->irq.handler = ns16550_irq_handler;
75	instance->irq.instance = instance;	75	instance->irq.instance = instance;
76	instance->irq.cir = cir;	76	instance->irq.cir = cir;
77	instance->irq.cir_arg = cir_arg;	77	instance->irq.cir_arg = cir_arg;
78	irq_register(&instance->irq);	78	irq_register(&instance->irq);
79		79
80	while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))	80	while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))
81	(void) pio_read_8(&dev->rbr);	81	(void) pio_read_8(&dev->rbr);
82		82
83	/* Enable interrupts */	83	/* Enable interrupts */
84	pio_write_8(&dev->ier, IER_ERBFI);	84	pio_write_8(&dev->ier, IER_ERBFI);
85	pio_write_8(&dev->mcr, MCR_OUT2);	85	pio_write_8(&dev->mcr, MCR_OUT2);
86		86
87	return true;	87	return true;
88	}	88	}
89		89
90	irq_ownership_t ns16550_claim(irq_t *irq)	90	irq_ownership_t ns16550_claim(irq_t *irq)
91	{	91	{
92	ns16550_instance_t *instance = irq->instance;	92	ns16550_instance_t *instance = irq->instance;
93	ns16550_t *dev = instance->ns16550;	93	ns16550_t *dev = instance->ns16550;
94		94
95	if (pio_read_8(&dev->lsr) & LSR_DATA_READY)	95	if (pio_read_8(&dev->lsr) & LSR_DATA_READY)
96	return IRQ_ACCEPT;	96	return IRQ_ACCEPT;
97	else	97	else
98	return IRQ_DECLINE;	98	return IRQ_DECLINE;
99	}	99	}
100		100
101	void ns16550_irq_handler(irq_t *irq)	101	void ns16550_irq_handler(irq_t *irq)
102	{	102	{
103	ns16550_instance_t *instance = irq->instance;	103	ns16550_instance_t *instance = irq->instance;
104	ns16550_t *dev = instance->ns16550;	104	ns16550_t *dev = instance->ns16550;
105		105
106	if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {	106	if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {
107	uint8_t x;	107	uint8_t x;
108		108
109	x = pio_read_8(&dev->rbr);	109	x = pio_read_8(&dev->rbr);
110	if (instance->devout)	110	if (instance->devout)
111	chardev_push_character(instance->devout, x);	111	chardev_push_character(instance->devout, x);
112	}	112	}
113	}	113	}
114		114
115	/** @}	115	/** @}
116	*/	116	*/
117		117

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