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