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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 |