src/mainboard/google/rush_ryu/romstage.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright 2014 Google Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <delay.h>
  17 #include <soc/addressmap.h>
  18 #include <device/i2c.h>
  19 #include <soc/clock.h>
  20 #include <soc/funitcfg.h>
  21 #include <soc/nvidia/tegra/i2c.h>
  22 #include <soc/padconfig.h>
  23 #include <soc/romstage.h>
  24
  25 #include "gpio.h"
  26 #include "pmic.h"
  27
  28 static const struct pad_config padcfgs[] = {
  29         /* AP_SYS_RESET_L */
  30         PAD_CFG_GPIO_OUT1(GPIO_PI5, PINMUX_PULL_UP),
  31         /* WP_L */
  32         PAD_CFG_GPIO_INPUT(KB_ROW1, PINMUX_PULL_NONE),
  33         /* MODEM_RESET */
  34         PAD_CFG_GPIO_OUT0(KB_ROW11, PINMUX_PULL_DOWN),
  35         /* MODEM_PWR_ON */
  36         PAD_CFG_GPIO_OUT0(KB_ROW12, PINMUX_PULL_DOWN),
  37         /* MDM_DET - expected to be pulled down by LTE modem */
  38         PAD_CFG_GPIO_INPUT(GPIO_PV1, PINMUX_PULL_UP),
  39         /* Power Button - active high / low depending on board id */
  40         PAD_CFG_GPIO_INPUT(KB_COL0, PINMUX_PULL_UP),
  41         /* BTN_AP_VOLD_L - active low */
  42         PAD_CFG_GPIO_INPUT(KB_COL6, PINMUX_PULL_UP),
  43         /* BTN_AP_VOLU_L - active low */
  44         PAD_CFG_GPIO_INPUT(KB_COL7, PINMUX_PULL_UP),
  45 };
  46
  47 static const struct pad_config tpm_pads[] = {
  48         PAD_CFG_SFIO(CAM_I2C_SCL, PINMUX_INPUT_ENABLE, I2C3),
  49         PAD_CFG_SFIO(CAM_I2C_SDA, PINMUX_INPUT_ENABLE, I2C3),
  50 };
  51
  52 static const struct pad_config ec_i2c_pads[] = {
  53         PAD_CFG_SFIO(GEN2_I2C_SCL, PINMUX_OPEN_DRAIN|PINMUX_INPUT_ENABLE, I2C2),
  54         PAD_CFG_SFIO(GEN2_I2C_SDA, PINMUX_OPEN_DRAIN|PINMUX_INPUT_ENABLE, I2C2),
  55 };
  56
  57 static const struct funit_cfg funits[] = {
  58         /* TPM on I2C3  @ 400kHz */
  59         FUNIT_CFG(I2C3, PLLP, 400, tpm_pads, ARRAY_SIZE(tpm_pads)),
  60         /* EC on I2C2 - pulled to 3.3V @ 100kHz */
  61         FUNIT_CFG(I2C2, PLLP, 100, ec_i2c_pads, ARRAY_SIZE(ec_i2c_pads)),
  62 };
  63
  64 static void lte_modem_init(void)
  65 {
  66         int mdm_det;
  67         uint8_t data;
  68
  69         /* A LTE modem is present if MDM_DET is pulled down by the modem */
  70         mdm_det = gpio_get(MDM_DET);
  71         if (mdm_det == 1)
  72                 return;
  73
  74         printk(BIOS_DEBUG, "Found LTE modem\n");
  75
  76         /* Enable PMIC CLK32KGAUDIO to drive CLK_MDM_32K */
  77         pmic_read_reg(I2CPWR_BUS, TI65913_PAD2, &data);
  78         pmic_write_reg(I2CPWR_BUS, TI65913_PAD2,
  79                         PAD2_GPIO_5_SEC_CLK32KGAUDIO(data), 0);
  80         pmic_write_reg(I2CPWR_BUS, TI65913_CLK32KGAUDIO_CTRL,
  81                         TI65913_MODE_ACTIVE_ON, 0);
  82
  83         /* FULL_CARD_POWER_OFF# (A44: MODEM_PWR_ON) and RESET#
  84          * (A44: MODEM_RESET) of the LTE modem are actively low and initially
  85          * pulled down by the pad config. To properly enable the LTE modem,
  86          * de-assert FULL_CARD_POWER_OFF#, wait for at least 10ms, and then
  87          * de-assert RESET#.
  88          */
  89         gpio_output(MODEM_PWR_ON, 1);
  90         udelay(15000);
  91         gpio_output(MODEM_RESET, 1);
  92 }
  93
  94 void romstage_mainboard_init(void)
  95 {
  96         /* Bring up controller interfaces for ramstage loading. */
  97         soc_configure_funits(funits, ARRAY_SIZE(funits));
  98         soc_configure_pads(padcfgs, ARRAY_SIZE(padcfgs));
  99
 100         /* TPM */
 101         i2c_init(I2C3_BUS);
 102         /* EC */
 103         i2c_init(I2C2_BUS);
 104
 105         lte_modem_init();
 106 }
 107
 108 void mainboard_configure_pmc(void)
 109 {
 110 }
 111
 112 void mainboard_enable_vdd_cpu(void)
 113 {
 114         /* VDD_CPU is already enabled in bootblock. */
 115 }