src/soc/mediatek/mt8173/gpio_init.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 <soc/gpio.h>
  17 #include <soc/mipi.h>
  18
  19 /*
  20  * GPIO 47-56 are controlled by MIPI register by default.
  21  * When they are used as GPI, we have to set IES of MIPI register to 1.
  22  * Additionally, pulls of these pins are controlled by MIPI,
  23  * and pull-setting of these pins are forbidden in our driver.
  24  */
  25 static void set_gpi_from_mipi(void)
  26 {
  27         setbits32(&mt8173_mipi->mipi_rx_ana4c,
  28                 1 << 0  |       /* RG_MIPI_GPI0_IES GPI47 */
  29                 1 << 6  |       /* RG_MIPI_GPI1_IES GPI48 */
  30                 1 << 12 |       /* RG_MIPI_GPI2_IES GPI49 */
  31                 1 << 18 |       /* RG_MIPI_GPI3_IES GPI50 */
  32                 1 << 24);       /* RF_MIPI_GPI4_IES GPI51 */
  33
  34         setbits32(&mt8173_mipi->mipi_rx_ana50,
  35                 1 << 0  |       /* RG_MIPI_GPI5_IES GPI52 */
  36                 1 << 6  |       /* RG_MIPI_GPI6_IES GPI53 */
  37                 1 << 12 |       /* RG_MIPI_GPI7_IES GPI54 */
  38                 1 << 18 |       /* RG_MIPI_GPI8_IES GPI55 */
  39                 1 << 24);       /* RF_MIPI_GPI9_IES GPI56 */
  40 }
  41
  42 /*
  43  * overwrite the T/RDSEL default value of exmd_ctrl and
  44  * msdc2_ctrl5 as b'1010
  45  */
  46 static void gpio_set_duty(enum external_power ext_power)
  47 {
  48         /* EXMD control reg */
  49         if (ext_power == GPIO_EINT_1P8V) {
  50                 /* exmd_ctrl[9:4] = b`000000, [3:0] = b`1010 */
  51                 write16(&mtk_gpio->exmd_ctrl[0].rst, 0x3F5);
  52                 write16(&mtk_gpio->exmd_ctrl[0].set, 0xA);
  53         } else if (ext_power == GPIO_EINT_3P3V) {
  54                 /* exmd_ctrl[9:4] = b`001100, [3:0] = b`1010 */
  55                 write16(&mtk_gpio->exmd_ctrl[0].rst, 0x335);
  56                 write16(&mtk_gpio->exmd_ctrl[0].set, 0xCA);
  57         }
  58
  59         /* other R/TDSEL */
  60         /* msdc2_ctrl5, bit[3:0] = b`1010 */
  61         write16(&mtk_gpio->msdc2_ctrl5.set, 0xA);
  62         write16(&mtk_gpio->msdc2_ctrl5.rst, 0x5);
  63 }
  64
  65 void gpio_init(enum external_power ext_power)
  66 {
  67         set_gpi_from_mipi();
  68         gpio_set_duty(ext_power);
  69 }