target/linux/ifxmips/files/drivers/char/ifxmips_led.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2006 infineon
  17  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  18  *
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/version.h>
  24 #include <linux/types.h>
  25 #include <linux/fs.h>
  26 #include <linux/init.h>
  27 #include <linux/platform_device.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/unistd.h>
  30 #include <linux/errno.h>
  31 #include <asm/ifxmips/ifxmips.h>
  32 #include <asm/ifxmips/ifxmips_gpio.h>
  33 #include <asm/ifxmips/ifxmips_pmu.h>
  34 #include <linux/leds.h>
  35 #include <linux/delay.h>
  36
  37 #define DRVNAME                                                 "ifxmips_led"
  38
  39 #define IFXMIPS_LED_CLK_EDGE                    IFXMIPS_LED_FALLING
  40 //#define IFXMIPS_LED_CLK_EDGE                  IFXMIPS_LED_RISING
  41
  42 #define IFXMIPS_LED_SPEED                               IFXMIPS_LED_8HZ
  43
  44 #define IFXMIPS_LED_GPIO_PORT                   0
  45
  46 #define IFXMIPS_MAX_LED                                 24
  47
  48 struct ifxmips_led {
  49         struct led_classdev cdev;
  50         u8 bit;
  51 };
  52
  53 void
  54 ifxmips_led_set (unsigned int led)
  55 {
  56         led &= 0xffffff;
  57         writel(readl(IFXMIPS_LED_CPU0) | led, IFXMIPS_LED_CPU0);
  58 }
  59 EXPORT_SYMBOL(ifxmips_led_set);
  60
  61 void
  62 ifxmips_led_clear (unsigned int led)
  63 {
  64         led = ~(led & 0xffffff);
  65         writel(readl(IFXMIPS_LED_CPU0) & led, IFXMIPS_LED_CPU0);
  66 }
  67 EXPORT_SYMBOL(ifxmips_led_clear);
  68
  69 void
  70 ifxmips_led_blink_set (unsigned int led)
  71 {
  72         led &= 0xffffff;
  73         writel(readl(IFXMIPS_LED_CON0) | led, IFXMIPS_LED_CON0);
  74 }
  75 EXPORT_SYMBOL(ifxmips_led_blink_set);
  76
  77 void
  78 ifxmips_led_blink_clear (unsigned int led)
  79 {
  80         led = ~(led & 0xffffff);
  81         writel(readl(IFXMIPS_LED_CON0) & led, IFXMIPS_LED_CON0);
  82 }
  83 EXPORT_SYMBOL(ifxmips_led_blink_clear);
  84
  85 void
  86 ifxmips_ledapi_set(struct led_classdev *led_cdev, enum led_brightness value)
  87 {
  88         struct ifxmips_led *led_dev = container_of(led_cdev, struct ifxmips_led, cdev);
  89
  90         if(value)
  91                 ifxmips_led_set(1 << led_dev->bit);
  92         else
  93                 ifxmips_led_clear(1 << led_dev->bit);
  94 }
  95
  96 void
  97 ifxmips_led_setup_gpio (void)
  98 {
  99         int i = 0;
 100
 101         /* we need to setup pins SH,D,ST (4,5,6) */
 102         for (i = 4; i < 7; i++)
 103         {
 104                 ifxmips_port_set_altsel0(IFXMIPS_LED_GPIO_PORT, i);
 105                 ifxmips_port_clear_altsel1(IFXMIPS_LED_GPIO_PORT, i);
 106                 ifxmips_port_set_dir_out(IFXMIPS_LED_GPIO_PORT, i);
 107                 ifxmips_port_set_open_drain(IFXMIPS_LED_GPIO_PORT, i);
 108         }
 109 }
 110
 111 static int
 112 ifxmips_led_probe(struct platform_device *dev)
 113 {
 114         int i = 0;
 115
 116         ifxmips_led_setup_gpio();
 117
 118         writel(0, IFXMIPS_LED_AR);
 119         writel(0, IFXMIPS_LED_CPU0);
 120         writel(0, IFXMIPS_LED_CPU1);
 121         writel(LED_CON0_SWU, IFXMIPS_LED_CON0);
 122         writel(0, IFXMIPS_LED_CON1);
 123
 124         /* setup the clock edge that the shift register is triggered on */
 125         writel(readl(IFXMIPS_LED_CON0) & ~IFXMIPS_LED_EDGE_MASK, IFXMIPS_LED_CON0);
 126         writel(readl(IFXMIPS_LED_CON0) | IFXMIPS_LED_CLK_EDGE, IFXMIPS_LED_CON0);
 127
 128         /* per default leds 15-0 are set */
 129         writel(IFXMIPS_LED_GROUP1 | IFXMIPS_LED_GROUP0, IFXMIPS_LED_CON1);
 130
 131         /* leds are update periodically by the FPID */
 132         writel(readl(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_UPD_MASK, IFXMIPS_LED_CON1);
 133         writel(readl(IFXMIPS_LED_CON1) | IFXMIPS_LED_UPD_SRC_FPI, IFXMIPS_LED_CON1);
 134
 135         /* set led update speed */
 136         writel(readl(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_MASK, IFXMIPS_LED_CON1);
 137         writel(readl(IFXMIPS_LED_CON1) | IFXMIPS_LED_SPEED, IFXMIPS_LED_CON1);
 138
 139         /* adsl 0 and 1 leds are updated by the arc */
 140         writel(readl(IFXMIPS_LED_CON0) | IFXMIPS_LED_ADSL_SRC, IFXMIPS_LED_CON0);
 141
 142         /* per default, the leds are turned on */
 143         ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_LED);
 144
 145         for(i = 0; i < IFXMIPS_MAX_LED; i++)
 146         {
 147                 struct ifxmips_led *tmp = kzalloc(sizeof(struct ifxmips_led), GFP_KERNEL);
 148                 tmp->cdev.brightness_set = ifxmips_ledapi_set;
 149                 tmp->cdev.name = kmalloc(sizeof("ifxmips:led:00"), GFP_KERNEL);
 150                 sprintf(tmp->cdev.name, "ifxmips:led:%02d", i);
 151                 tmp->cdev.default_trigger = NULL;
 152                 tmp->bit = i;
 153                 led_classdev_register(&dev->dev, &tmp->cdev);
 154         }
 155
 156         return 0;
 157 }
 158
 159 static int
 160 ifxmips_led_remove(struct platform_device *pdev)
 161 {
 162         return 0;
 163 }
 164
 165 static struct
 166 platform_driver ifxmips_led_driver = {
 167         .probe = ifxmips_led_probe,
 168         .remove = ifxmips_led_remove,
 169         .driver = {
 170                 .name = DRVNAME,
 171                 .owner = THIS_MODULE,
 172         },
 173 };
 174
 175 int __init
 176 ifxmips_led_init (void)
 177 {
 178         int ret = platform_driver_register(&ifxmips_led_driver);
 179         if (ret)
 180                 printk(KERN_INFO "ifxmips_led: Error registering platfom driver!");
 181
 182         return ret;
 183 }
 184
 185 void __exit
 186 ifxmips_led_exit (void)
 187 {
 188         platform_driver_unregister(&ifxmips_led_driver);
 189 }
 190
 191 module_init(ifxmips_led_init);
 192 module_exit(ifxmips_led_exit);