1 /*
2 * Copyright (c) 2004-2008 Reyk Floeter <reyk@openbsd.org>
3 * Copyright (c) 2006-2008 Nick Kossifidis <mickflemm@gmail.com>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 *
17 */
18
19 /****************\
20 GPIO Functions
21 \****************/
22
23 #include "ath5k.h"
24 #include "reg.h"
25 #include "debug.h"
26
27
28 /**
29 * DOC: GPIO/LED functions
30 *
31 * Here we control the 6 bidirectional GPIO pins provided by the hw.
32 * We can set a GPIO pin to be an input or an output pin on GPIO control
33 * register and then read or set its status from GPIO data input/output
34 * registers.
35 *
36 * We also control the two LED pins provided by the hw, LED_0 is our
37 * "power" LED and LED_1 is our "network activity" LED but many scenarios
38 * are available from hw. Vendors might also provide LEDs connected to the
39 * GPIO pins, we handle them through the LED subsystem on led.c
40 */
41
42
43 /**
44 * ath5k_hw_set_ledstate() - Set led state
45 * @ah: The &struct ath5k_hw
46 * @state: One of AR5K_LED_*
47 *
48 * Used to set the LED blinking state. This only
49 * works for the LED connected to the LED_0, LED_1 pins,
50 * not the GPIO based.
51 */
52 void
53 ath5k_hw_set_ledstate(struct ath5k_hw *ah, unsigned int state)
54 {
55 u32 led;
56 /*5210 has different led mode handling*/
57 u32 led_5210;
58
59 /*Reset led status*/
60 if (ah->ah_version != AR5K_AR5210)
61 AR5K_REG_DISABLE_BITS(ah, AR5K_PCICFG,
62 AR5K_PCICFG_LEDMODE | AR5K_PCICFG_LED);
63 else
64 AR5K_REG_DISABLE_BITS(ah, AR5K_PCICFG, AR5K_PCICFG_LED);
65
66 /*
67 * Some blinking values, define at your wish
68 */
69 switch (state) {
70 case AR5K_LED_SCAN:
71 case AR5K_LED_AUTH:
72 led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_PEND;
73 led_5210 = AR5K_PCICFG_LED_PEND | AR5K_PCICFG_LED_BCTL;
74 break;
75
76 case AR5K_LED_INIT:
77 led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_NONE;
78 led_5210 = AR5K_PCICFG_LED_PEND;
79 break;
80
81 case AR5K_LED_ASSOC:
82 case AR5K_LED_RUN:
83 led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_ASSOC;
84 led_5210 = AR5K_PCICFG_LED_ASSOC;
85 break;
86
87 default:
88 led = AR5K_PCICFG_LEDMODE_PROM | AR5K_PCICFG_LED_NONE;
89 led_5210 = AR5K_PCICFG_LED_PEND;
90 break;
91 }
92
93 /*Write new status to the register*/
94 if (ah->ah_version != AR5K_AR5210)
95 AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, led);
96 else
97 AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, led_5210);
98 }
99
100 /**
101 * ath5k_hw_set_gpio_input() - Set GPIO inputs
102 * @ah: The &struct ath5k_hw
103 * @gpio: GPIO pin to set as input
104 */
105 int
106 ath5k_hw_set_gpio_input(struct ath5k_hw *ah, u32 gpio)
107 {
108 if (gpio >= AR5K_NUM_GPIO)
109 return -EINVAL;
110
111 ath5k_hw_reg_write(ah,
112 (ath5k_hw_reg_read(ah, AR5K_GPIOCR) & ~AR5K_GPIOCR_OUT(gpio))
113 | AR5K_GPIOCR_IN(gpio), AR5K_GPIOCR);
114
115 return 0;
116 }
117
118 /**
119 * ath5k_hw_set_gpio_output() - Set GPIO outputs
120 * @ah: The &struct ath5k_hw
121 * @gpio: The GPIO pin to set as output
122 */
123 int
124 ath5k_hw_set_gpio_output(struct ath5k_hw *ah, u32 gpio)
125 {
126 if (gpio >= AR5K_NUM_GPIO)
127 return -EINVAL;
128
129 ath5k_hw_reg_write(ah,
130 (ath5k_hw_reg_read(ah, AR5K_GPIOCR) & ~AR5K_GPIOCR_OUT(gpio))
131 | AR5K_GPIOCR_OUT(gpio), AR5K_GPIOCR);
132
133 return 0;
134 }
135
136 /**
137 * ath5k_hw_get_gpio() - Get GPIO state
138 * @ah: The &struct ath5k_hw
139 * @gpio: The GPIO pin to read
140 */
141 u32
142 ath5k_hw_get_gpio(struct ath5k_hw *ah, u32 gpio)
143 {
144 if (gpio >= AR5K_NUM_GPIO)
145 return 0xffffffff;
146
147 /* GPIO input magic */
148 return ((ath5k_hw_reg_read(ah, AR5K_GPIODI) & AR5K_GPIODI_M) >> gpio) &
149 0x1;
150 }
151
152 /**
153 * ath5k_hw_set_gpio() - Set GPIO state
154 * @ah: The &struct ath5k_hw
155 * @gpio: The GPIO pin to set
156 * @val: Value to set (boolean)
157 */
158 int
159 ath5k_hw_set_gpio(struct ath5k_hw *ah, u32 gpio, u32 val)
160 {
161 u32 data;
162
163 if (gpio >= AR5K_NUM_GPIO)
164 return -EINVAL;
165
166 /* GPIO output magic */
167 data = ath5k_hw_reg_read(ah, AR5K_GPIODO);
168
169 data &= ~(1 << gpio);
170 data |= (val & 1) << gpio;
171
172 ath5k_hw_reg_write(ah, data, AR5K_GPIODO);
173
174 return 0;
175 }
176
177 /**
178 * ath5k_hw_set_gpio_intr() - Initialize the GPIO interrupt (RFKill switch)
179 * @ah: The &struct ath5k_hw
180 * @gpio: The GPIO pin to use
181 * @interrupt_level: True to generate interrupt on active pin (high)
182 *
183 * This function is used to set up the GPIO interrupt for the hw RFKill switch.
184 * That switch is connected to a GPIO pin and it's number is stored on EEPROM.
185 * It can either open or close the circuit to indicate that we should disable
186 * RF/Wireless to save power (we also get that from EEPROM).
187 */
188 void
189 ath5k_hw_set_gpio_intr(struct ath5k_hw *ah, unsigned int gpio,
190 u32 interrupt_level)
191 {
192 u32 data;
193
194 if (gpio >= AR5K_NUM_GPIO)
195 return;
196
197 /*
198 * Set the GPIO interrupt
199 */
200 data = (ath5k_hw_reg_read(ah, AR5K_GPIOCR) &
201 ~(AR5K_GPIOCR_INT_SEL(gpio) | AR5K_GPIOCR_INT_SELH |
202 AR5K_GPIOCR_INT_ENA | AR5K_GPIOCR_OUT(gpio))) |
203 (AR5K_GPIOCR_INT_SEL(gpio) | AR5K_GPIOCR_INT_ENA);
204
205 ath5k_hw_reg_write(ah, interrupt_level ? data :
206 (data | AR5K_GPIOCR_INT_SELH), AR5K_GPIOCR);
207
208 ah->ah_imr |= AR5K_IMR_GPIO;
209
210 /* Enable GPIO interrupts */
211 AR5K_REG_ENABLE_BITS(ah, AR5K_PIMR, AR5K_IMR_GPIO);
212 }
213