drivers/net/wireless/ath/ath5k/gpio.c

   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 #include "base.h"
  27
  28 /*
  29  * Set led state
  30  */
  31 void ath5k_hw_set_ledstate(struct ath5k_hw *ah, unsigned int state)
  32 {
  33         u32 led;
  34         /*5210 has different led mode handling*/
  35         u32 led_5210;
  36
  37         ATH5K_TRACE(ah->ah_sc);
  38
  39         /*Reset led status*/
  40         if (ah->ah_version != AR5K_AR5210)
  41                 AR5K_REG_DISABLE_BITS(ah, AR5K_PCICFG,
  42                         AR5K_PCICFG_LEDMODE |  AR5K_PCICFG_LED);
  43         else
  44                 AR5K_REG_DISABLE_BITS(ah, AR5K_PCICFG, AR5K_PCICFG_LED);
  45
  46         /*
  47          * Some blinking values, define at your wish
  48          */
  49         switch (state) {
  50         case AR5K_LED_SCAN:
  51         case AR5K_LED_AUTH:
  52                 led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_PEND;
  53                 led_5210 = AR5K_PCICFG_LED_PEND | AR5K_PCICFG_LED_BCTL;
  54                 break;
  55
  56         case AR5K_LED_INIT:
  57                 led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_NONE;
  58                 led_5210 = AR5K_PCICFG_LED_PEND;
  59                 break;
  60
  61         case AR5K_LED_ASSOC:
  62         case AR5K_LED_RUN:
  63                 led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_ASSOC;
  64                 led_5210 = AR5K_PCICFG_LED_ASSOC;
  65                 break;
  66
  67         default:
  68                 led = AR5K_PCICFG_LEDMODE_PROM | AR5K_PCICFG_LED_NONE;
  69                 led_5210 = AR5K_PCICFG_LED_PEND;
  70                 break;
  71         }
  72
  73         /*Write new status to the register*/
  74         if (ah->ah_version != AR5K_AR5210)
  75                 AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, led);
  76         else
  77                 AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, led_5210);
  78 }
  79
  80 /*
  81  * Set GPIO inputs
  82  */
  83 int ath5k_hw_set_gpio_input(struct ath5k_hw *ah, u32 gpio)
  84 {
  85         ATH5K_TRACE(ah->ah_sc);
  86         if (gpio >= AR5K_NUM_GPIO)
  87                 return -EINVAL;
  88
  89         ath5k_hw_reg_write(ah,
  90                 (ath5k_hw_reg_read(ah, AR5K_GPIOCR) & ~AR5K_GPIOCR_OUT(gpio))
  91                 | AR5K_GPIOCR_IN(gpio), AR5K_GPIOCR);
  92
  93         return 0;
  94 }
  95
  96 /*
  97  * Set GPIO outputs
  98  */
  99 int ath5k_hw_set_gpio_output(struct ath5k_hw *ah, u32 gpio)
 100 {
 101         ATH5K_TRACE(ah->ah_sc);
 102         if (gpio >= AR5K_NUM_GPIO)
 103                 return -EINVAL;
 104
 105         ath5k_hw_reg_write(ah,
 106                 (ath5k_hw_reg_read(ah, AR5K_GPIOCR) & ~AR5K_GPIOCR_OUT(gpio))
 107                 | AR5K_GPIOCR_OUT(gpio), AR5K_GPIOCR);
 108
 109         return 0;
 110 }
 111
 112 /*
 113  * Get GPIO state
 114  */
 115 u32 ath5k_hw_get_gpio(struct ath5k_hw *ah, u32 gpio)
 116 {
 117         ATH5K_TRACE(ah->ah_sc);
 118         if (gpio >= AR5K_NUM_GPIO)
 119                 return 0xffffffff;
 120
 121         /* GPIO input magic */
 122         return ((ath5k_hw_reg_read(ah, AR5K_GPIODI) & AR5K_GPIODI_M) >> gpio) &
 123                 0x1;
 124 }
 125
 126 /*
 127  * Set GPIO state
 128  */
 129 int ath5k_hw_set_gpio(struct ath5k_hw *ah, u32 gpio, u32 val)
 130 {
 131         u32 data;
 132         ATH5K_TRACE(ah->ah_sc);
 133
 134         if (gpio >= AR5K_NUM_GPIO)
 135                 return -EINVAL;
 136
 137         /* GPIO output magic */
 138         data = ath5k_hw_reg_read(ah, AR5K_GPIODO);
 139
 140         data &= ~(1 << gpio);
 141         data |= (val & 1) << gpio;
 142
 143         ath5k_hw_reg_write(ah, data, AR5K_GPIODO);
 144
 145         return 0;
 146 }
 147
 148 /*
 149  * Initialize the GPIO interrupt (RFKill switch)
 150  */
 151 void ath5k_hw_set_gpio_intr(struct ath5k_hw *ah, unsigned int gpio,
 152                 u32 interrupt_level)
 153 {
 154         u32 data;
 155
 156         ATH5K_TRACE(ah->ah_sc);
 157         if (gpio >= AR5K_NUM_GPIO)
 158                 return;
 159
 160         /*
 161          * Set the GPIO interrupt
 162          */
 163         data = (ath5k_hw_reg_read(ah, AR5K_GPIOCR) &
 164                 ~(AR5K_GPIOCR_INT_SEL(gpio) | AR5K_GPIOCR_INT_SELH |
 165                 AR5K_GPIOCR_INT_ENA | AR5K_GPIOCR_OUT(gpio))) |
 166                 (AR5K_GPIOCR_INT_SEL(gpio) | AR5K_GPIOCR_INT_ENA);
 167
 168         ath5k_hw_reg_write(ah, interrupt_level ? data :
 169                 (data | AR5K_GPIOCR_INT_SELH), AR5K_GPIOCR);
 170
 171         ah->ah_imr |= AR5K_IMR_GPIO;
 172
 173         /* Enable GPIO interrupts */
 174         AR5K_REG_ENABLE_BITS(ah, AR5K_PIMR, AR5K_IMR_GPIO);
 175 }
 176