source: rtems/bsps/arm/lm3s69xx/start/io.c @ e0dd8a5a

5
Last change on this file since e0dd8a5a was 9964895, checked in by Sebastian Huber <sebastian.huber@…>, on Apr 20, 2018 at 8:35:35 AM

bsps: Move startup files to bsps

Adjust build support files to new directory layout.

This patch is a part of the BSP source reorganization.

Update #3285.

  • Property mode set to 100644
File size: 3.6 KB
Line 
1/*
2 * Copyright © 2013 Eugeniy Meshcheryakov <eugen@debian.org>
3 *
4 * The license and distribution terms for this file may be
5 * found in the file LICENSE in this distribution or at
6 * http://www.rtems.org/license/LICENSE.
7 */
8
9#include <bsp/io.h>
10#include <bsp/lm3s69xx.h>
11#include <bsp/syscon.h>
12#include <rtems.h>
13
14static void set_bit(volatile uint32_t *reg, unsigned index, uint32_t set)
15{
16  uint32_t mask = 1U;
17  uint32_t val = *reg;
18
19  val &= ~(mask << index);
20  val |= set << index;
21
22  *reg = val;
23}
24
25static void set_config(unsigned int pin, const lm3s69xx_gpio_config *config)
26{
27  unsigned int port = LM3S69XX_GPIO_PORT_OF_PIN(pin);
28  volatile lm3s69xx_gpio *gpio = LM3S69XX_GPIO(port);
29  unsigned int index = LM3S69XX_GPIO_INDEX_OF_PIN(pin);
30  rtems_interrupt_level level;
31
32  rtems_interrupt_disable(level);
33
34  lm3s69xx_syscon_enable_gpio_clock(port, true);
35
36  /* Disable digital and analog functions before reconfiguration. */
37  set_bit(&gpio->den, index, 0);
38  set_bit(&gpio->amsel, index, 0);
39
40  set_bit(&gpio->afsel, index, config->alternate);
41  set_bit(&gpio->dir, index, config->dir);
42  set_bit(&gpio->odr, index, config->otype);
43
44  switch (config->drive) {
45  case LM3S69XX_GPIO_DRIVE_4MA:
46    gpio->dr4r |= 1 << index;
47    break;
48  case LM3S69XX_GPIO_DRIVE_8MA:
49    gpio->dr8r |= 1 << index;
50    break;
51  default:
52    gpio->dr2r |= 1 << index;
53    break;
54  }
55
56  switch (config->pull) {
57  case LM3S69XX_GPIO_PULL_UP:
58    gpio->pur |= 1 << index;
59    break;
60  case LM3S69XX_GPIO_PULL_DOWN:
61    gpio->pdr |= 1 << index;
62    break;
63  default:
64    set_bit(&gpio->pdr, index, 0);
65    set_bit(&gpio->pur, index, 0);
66    break;
67  }
68
69  set_bit(&gpio->slr, index, config->slr);
70
71  set_bit(&gpio->den, index, config->digital);
72  set_bit(&gpio->amsel, index, config->analog);
73
74  rtems_interrupt_enable(level);
75}
76
77void lm3s69xx_gpio_set_config(const lm3s69xx_gpio_config *config)
78{
79  unsigned int current = config->pin_first;
80  unsigned int last = config->pin_last;
81
82  while (current <= last) {
83    set_config(current, config);
84    current++;
85  }
86}
87
88void lm3s69xx_gpio_set_config_array(const lm3s69xx_gpio_config *configs, unsigned int count)
89{
90  unsigned int i;
91
92  for (i = 0; i < count; i++)
93    lm3s69xx_gpio_set_config(&configs[i]);
94}
95
96/**
97 * Enables/disables digital function on the specified pin.
98 */
99void lm3s69xx_gpio_digital_enable(unsigned int pin, bool enable)
100{
101  unsigned int port = LM3S69XX_GPIO_PORT_OF_PIN(pin);
102  volatile lm3s69xx_gpio *gpio = LM3S69XX_GPIO(port);
103  unsigned int index = LM3S69XX_GPIO_INDEX_OF_PIN(pin);
104  rtems_interrupt_level level;
105
106  rtems_interrupt_disable(level);
107  set_bit(&gpio->den, index, enable);
108  rtems_interrupt_enable(level);
109}
110
111/**
112 * Enables/disables analog mode on the specified pin.
113 */
114void lm3s69xx_gpio_analog_mode_select(unsigned int pin, bool enable)
115{
116  unsigned int port = LM3S69XX_GPIO_PORT_OF_PIN(pin);
117  volatile lm3s69xx_gpio *gpio = LM3S69XX_GPIO(port);
118  unsigned int index = LM3S69XX_GPIO_INDEX_OF_PIN(pin);
119  rtems_interrupt_level level;
120
121  rtems_interrupt_disable(level);
122  set_bit(&gpio->amsel, index, enable);
123  rtems_interrupt_enable(level);
124}
125
126void lm3s69xx_gpio_set_pin(unsigned int pin, bool set)
127{
128  unsigned int port = LM3S69XX_GPIO_PORT_OF_PIN(pin);
129  volatile lm3s69xx_gpio *gpio = LM3S69XX_GPIO(port);
130  unsigned int index = LM3S69XX_GPIO_INDEX_OF_PIN(pin);
131  uint32_t mask = 1U << index;
132
133  gpio->data[mask] = set ? mask : 0;
134}
135
136bool lm3s69xx_gpio_get_pin(unsigned int pin)
137{
138  unsigned int port = LM3S69XX_GPIO_PORT_OF_PIN(pin);
139  volatile lm3s69xx_gpio *gpio = LM3S69XX_GPIO(port);
140  unsigned int index = LM3S69XX_GPIO_INDEX_OF_PIN(pin);
141  uint32_t mask = 1U << index;
142
143  return gpio->data[mask] != 0;
144}
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