src/soc/qualcomm/qcs405/gpio.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <device/mmio.h>
  16 #include <types.h>
  17 #include <gpio.h>
  18
  19 void gpio_configure(gpio_t gpio, uint32_t func, uint32_t pull,
  20                                 uint32_t drive_str, uint32_t enable)
  21 {
  22         uint32_t reg_val;
  23         struct tlmm_gpio *regs = (void *)(uintptr_t)gpio.addr;
  24
  25         reg_val = ((enable & GPIO_CFG_OE_BMSK) << GPIO_CFG_OE_SHFT) |
  26                   ((drive_str & GPIO_CFG_DRV_BMSK) << GPIO_CFG_DRV_SHFT) |
  27                   ((func & GPIO_CFG_FUNC_BMSK) << GPIO_CFG_FUNC_SHFT) |
  28                   ((pull & GPIO_CFG_PULL_BMSK) << GPIO_CFG_PULL_SHFT);
  29
  30         write32(&regs->cfg, reg_val);
  31 }
  32
  33 void gpio_set(gpio_t gpio, int value)
  34 {
  35         struct tlmm_gpio *regs = (void *)(uintptr_t)gpio.addr;
  36         write32(&regs->in_out, (!!value) << GPIO_IO_OUT_SHFT);
  37 }
  38
  39 int gpio_get(gpio_t gpio)
  40 {
  41         struct tlmm_gpio *regs = (void *)(uintptr_t)gpio.addr;
  42
  43         return ((read32(&regs->in_out) >> GPIO_IO_IN_SHFT) &
  44                 GPIO_IO_IN_BMSK);
  45 }
  46
  47 void gpio_input_pulldown(gpio_t gpio)
  48 {
  49         gpio_configure(gpio, GPIO_FUNC_GPIO,
  50                                 GPIO_PULL_DOWN, GPIO_2MA, GPIO_DISABLE);
  51 }
  52
  53 void gpio_input_pullup(gpio_t gpio)
  54 {
  55         gpio_configure(gpio, GPIO_FUNC_GPIO,
  56                                 GPIO_PULL_UP, GPIO_2MA, GPIO_DISABLE);
  57 }
  58
  59 void gpio_input(gpio_t gpio)
  60 {
  61         gpio_configure(gpio, GPIO_FUNC_GPIO,
  62                                 GPIO_NO_PULL, GPIO_2MA, GPIO_DISABLE);
  63 }
  64
  65 void gpio_output(gpio_t gpio, int value)
  66 {
  67         gpio_set(gpio, value);
  68         gpio_configure(gpio, GPIO_FUNC_GPIO,
  69                                 GPIO_NO_PULL, GPIO_2MA, GPIO_ENABLE);
  70 }
  71
  72 void gpio_input_irq(gpio_t gpio, enum gpio_irq_type type, uint32_t pull)
  73 {
  74         struct tlmm_gpio *regs = (void *)(uintptr_t)gpio.addr;
  75
  76         gpio_configure(gpio, GPIO_FUNC_GPIO,
  77                                 pull, GPIO_2MA, GPIO_DISABLE);
  78
  79         clrsetbits32(&regs->intr_cfg, GPIO_INTR_DECT_CTL_MASK <<
  80                 GPIO_INTR_DECT_CTL_SHIFT, type << GPIO_INTR_DECT_CTL_SHIFT);
  81         clrsetbits32(&regs->intr_cfg, GPIO_INTR_RAW_STATUS_ENABLE
  82                 << GPIO_INTR_RAW_STATUS_EN_SHIFT, GPIO_INTR_RAW_STATUS_ENABLE
  83                 << GPIO_INTR_RAW_STATUS_EN_SHIFT);
  84 }
  85
  86 int gpio_irq_status(gpio_t gpio)
  87 {
  88         struct tlmm_gpio *regs = (void *)(uintptr_t)gpio.addr;
  89
  90         if (!(read32(&regs->intr_status) & GPIO_INTR_STATUS_MASK))
  91                 return 0;
  92
  93         write32(&regs->intr_status, GPIO_INTR_STATUS_DISABLE);
  94         return 1;
  95 }