src/soc/amd/common/block/acpi/gpio.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <acpi/acpigen.h>
   4 #include <console/console.h>
   5 #include <gpio.h>
   6
   7 static int acpigen_soc_gpio_op(const char *op, unsigned int gpio_num)
   8 {
   9         if (gpio_num >= SOC_GPIO_TOTAL_PINS) {
  10                 printk(BIOS_WARNING, "Pin %d should be smaller than"
  11                                         " %d\n", gpio_num, SOC_GPIO_TOTAL_PINS);
  12                 return -1;
  13         }
  14         if (SOC_GPIO_TOTAL_PINS >= AMD_GPIO_FIRST_REMOTE_GPIO_NUMBER &&
  15                         gpio_num >= SOC_GPIO_TOTAL_PINS) {
  16                 printk(BIOS_WARNING, "Pin %d is a remote GPIO which isn't supported"
  17                         " yet.\n", gpio_num);
  18                 return -1;
  19         }
  20         /* op (gpio_num) */
  21         acpigen_emit_namestring(op);
  22         acpigen_write_integer(gpio_num);
  23         return 0;
  24 }
  25
  26 static int acpigen_soc_get_gpio_state(const char *op, unsigned int gpio_num)
  27 {
  28         if (gpio_num >= SOC_GPIO_TOTAL_PINS) {
  29                 printk(BIOS_WARNING, "Pin %d should be smaller than"
  30                                         " %d\n", gpio_num, SOC_GPIO_TOTAL_PINS);
  31                 return -1;
  32         }
  33         if (SOC_GPIO_TOTAL_PINS >= AMD_GPIO_FIRST_REMOTE_GPIO_NUMBER &&
  34                         gpio_num >= SOC_GPIO_TOTAL_PINS) {
  35                 printk(BIOS_WARNING, "Pin %d is a remote GPIO which isn't supported"
  36                         " yet.\n", gpio_num);
  37                 return -1;
  38         }
  39         /* Store (op (gpio_num), Local0) */
  40         acpigen_write_store();
  41         acpigen_soc_gpio_op(op, gpio_num);
  42         acpigen_emit_byte(LOCAL0_OP);
  43         return 0;
  44 }
  45
  46 int acpigen_soc_read_rx_gpio(unsigned int gpio_num)
  47 {
  48         return acpigen_soc_get_gpio_state("\\_SB.GRXS", gpio_num);
  49 }
  50
  51 int acpigen_soc_get_tx_gpio(unsigned int gpio_num)
  52 {
  53         return acpigen_soc_get_gpio_state("\\_SB.GTXS", gpio_num);
  54 }
  55
  56 int acpigen_soc_set_tx_gpio(unsigned int gpio_num)
  57 {
  58         return acpigen_soc_gpio_op("\\_SB.STXS", gpio_num);
  59 }
  60
  61 int acpigen_soc_clear_tx_gpio(unsigned int gpio_num)
  62 {
  63         return acpigen_soc_gpio_op("\\_SB.CTXS", gpio_num);
  64 }