diff options
Diffstat (limited to 'board/purism/librem5/librem5.c')
| -rw-r--r-- | board/purism/librem5/librem5.c | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/board/purism/librem5/librem5.c b/board/purism/librem5/librem5.c new file mode 100644 index 0000000000..caa02655fc --- /dev/null +++ b/board/purism/librem5/librem5.c @@ -0,0 +1,425 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2018 NXP + * Copyright 2021 Purism + */ + +#include <common.h> +#include <malloc.h> +#include <errno.h> +#include <asm/io.h> +#include <miiphy.h> +#include <asm/mach-imx/iomux-v3.h> +#include <asm-generic/gpio.h> +#include <asm/arch/sys_proto.h> +#include <fsl_esdhc.h> +#include <mmc.h> +#include <asm/arch/imx8mq_pins.h> +#include <asm/arch/sys_proto.h> +#include <asm/mach-imx/gpio.h> +#include <asm/mach-imx/mxc_i2c.h> +#include <asm/arch/clock.h> +#include <asm/mach-imx/video.h> +#include <fuse.h> +#include <i2c.h> +#include <spl.h> +#include <usb.h> +#include <dwc3-uboot.h> +#include <linux/delay.h> +#include <linux/bitfield.h> +#include <power/regulator.h> +#include <usb/xhci.h> +#include "librem5.h" + +DECLARE_GLOBAL_DATA_PTR; + +int board_early_init_f(void) +{ + return 0; +} + +#if IS_ENABLED(CONFIG_LOAD_ENV_FROM_MMC_BOOT_PARTITION) +uint board_mmc_get_env_part(struct mmc *mmc) +{ + uint part = (mmc->part_config >> 3) & PART_ACCESS_MASK; + + if (part == 7) + part = 0; + return part; +} +#endif + +int tps65982_wait_for_app(int timeout, int timeout_step) +{ + int ret; + char response[6]; + struct udevice *udev, *bus; + + log_debug("%s: starting\n", __func__); + + /* Set the i2c bus */ + ret = uclass_get_device_by_seq(UCLASS_I2C, 0, &bus); + if (ret) { + log_err("%s: No bus %d\n", __func__, 0); + return 1; + } + + ret = i2c_get_chip(bus, 0x3f, 1, &udev); + if (ret) { + log_err("%s: setting chip offset failed %d\n", __func__, ret); + return 1; + } + + while (timeout > 0) { + ret = dm_i2c_read(udev, 0x03, (u8 *)response, 5); + log_debug("tps65982 mode %s\n", response); + if (response[1] == 'A') + return 0; + mdelay(timeout_step); + timeout -= timeout_step; + log_debug("tps65982 waited %d ms %c\n", timeout_step, response[1]); + } + + return 1; +} + +int tps65982_clear_dead_battery(void) +{ + int ret; + char cmd[5] = "\04DBfg"; + struct udevice *udev, *bus; + + log_debug("%s: starting\n", __func__); + + /* Set the i2c bus */ + ret = uclass_get_device_by_seq(UCLASS_I2C, 0, &bus); + if (ret) { + log_err("%s: No bus %d\n", __func__, 0); + return 1; + } + + ret = i2c_get_chip(bus, 0x3f, 1, &udev); + if (ret) { + log_err("%s: setting chip offset failed %d\n", __func__, ret); + return 1; + } + + /* clearing the dead battery flag when not in dead battery condition + * is a no-op, so there's no need to check if it's in effect + */ + ret = dm_i2c_write(udev, 0x08, cmd, 5); + if (ret) { + log_err("%s: writing 4CC command failed %d", __func__, ret); + return 1; + } + + return 0; +} + +#define TPS_POWER_STATUS_PWROPMODE(x) FIELD_GET(GENMASK(3, 2), x) + +#define TPS_PDO_CONTRACT_TYPE(x) FIELD_GET(GENMASK(31, 30), x) +#define TPS_PDO_CONTRACT_FIXED 0 +#define TPS_PDO_CONTRACT_BATTERY 1 +#define TPS_PDO_CONTRACT_VARIABLE 2 + +#define TPS_TYPEC_PWR_MODE_USB 0 +#define TPS_TYPEC_PWR_MODE_1_5A 1 +#define TPS_TYPEC_PWR_MODE_3_0A 2 +#define TPS_TYPEC_PWR_MODE_PD 3 + +#define TPS_PDO_FIXED_CONTRACT_MAX_CURRENT(x) (FIELD_GET(GENMASK(9, 0), x) * 10) +#define TPS_PDO_VAR_CONTRACT_MAX_CURRENT(x) (FIELD_GET(GENMASK(9, 0), x) * 10) +#define TPS_PDO_BAT_CONTRACT_MAX_VOLTAGE(x) (FIELD_GET(GENMASK(29, 20), x) * 50) +#define TPS_PDO_BAT_CONTRACT_MAX_POWER(x) (FIELD_GET(GENMASK(9, 0), x) * 250) + +int tps65982_get_max_current(void) +{ + int ret; + u8 buf[7]; + u8 pwr_status; + u32 contract; + int type, mode; + struct udevice *udev, *bus; + + log_debug("%s: starting\n", __func__); + + /* Set the i2c bus */ + ret = uclass_get_device_by_seq(UCLASS_I2C, 0, &bus); + if (ret) { + log_debug("%s: No bus %d\n", __func__, 0); + return -1; + } + + ret = i2c_get_chip(bus, 0x3f, 1, &udev); + if (ret) { + log_debug("%s: setting chip offset failed %d\n", __func__, ret); + return -1; + } + + ret = dm_i2c_read(udev, 0x3f, buf, 3); + if (ret) { + log_debug("%s: reading pwr_status failed %d\n", __func__, ret); + return -1; + } + + pwr_status = buf[1]; + + if (!(pwr_status & 1)) + return 0; + + mode = TPS_POWER_STATUS_PWROPMODE(pwr_status); + switch (mode) { + case TPS_TYPEC_PWR_MODE_1_5A: + return 1500; + case TPS_TYPEC_PWR_MODE_3_0A: + return 3000; + case TPS_TYPEC_PWR_MODE_PD: + ret = dm_i2c_read(udev, 0x34, buf, 7); + if (ret) { + log_debug("%s: reading active contract failed %d\n", __func__, ret); + return -1; + } + + contract = buf[1] + (buf[2] << 8) + (buf[3] << 16) + (buf[4] << 24); + + type = TPS_PDO_CONTRACT_TYPE(contract); + + switch (type) { + case TPS_PDO_CONTRACT_FIXED: + return TPS_PDO_FIXED_CONTRACT_MAX_CURRENT(contract); + case TPS_PDO_CONTRACT_BATTERY: + return 1000 * TPS_PDO_BAT_CONTRACT_MAX_POWER(contract) + / TPS_PDO_BAT_CONTRACT_MAX_VOLTAGE(contract); + case TPS_PDO_CONTRACT_VARIABLE: + return TPS_PDO_VAR_CONTRACT_MAX_CURRENT(contract); + default: + log_debug("Unknown contract type: %d\n", type); + return -1; + } + case TPS_TYPEC_PWR_MODE_USB: + return 500; + default: + log_debug("Unknown power mode: %d\n", mode); + return -1; + } +} + +int init_tps65982(void) +{ + log_debug("%s: starting\n", __func__); + + if (tps65982_wait_for_app(500, 100)) { + log_err("tps65982 APP boot failed\n"); + return 1; + } + + log_info("tps65982 boot successful\n"); + return 0; +} + +int bq25895_set_iinlim(int current) +{ + u8 val, iinlim; + int ret; + struct udevice *udev, *bus; + + /* Set the i2c bus */ + ret = uclass_get_device_by_seq(UCLASS_I2C, 3, &bus); + if (ret) { + log_err("%s: No bus 3\n", __func__); + return ret; + } + + ret = i2c_get_chip(bus, 0x6a, 1, &udev); + if (ret) { + log_err("%s: setting chip offset failed %d\n", __func__, ret); + return ret; + } + + if (current > 3250) + current = 3250; + if (current < 100) + current = 100; + + val = dm_i2c_reg_read(udev, 0x00); + iinlim = ((current - 100) / 50) & 0x3f; + val = (val & 0xc0) | iinlim; + dm_i2c_reg_write(udev, 0x00, val); + log_debug("REG00 0x%x\n", val); + + return 0; +} + +bool bq25895_battery_present(void) +{ + u8 val; + int ret; + struct udevice *udev, *bus; + + /* Set the i2c bus */ + ret = uclass_get_device_by_seq(UCLASS_I2C, 3, &bus); + if (ret) { + log_err("%s: No bus 3\n", __func__); + return ret; + } + + ret = i2c_get_chip(bus, 0x6a, 1, &udev); + if (ret) { + log_err("%s: setting chip offset failed %d\n", __func__, ret); + return ret; + } + + /* note that this may return false negatives when there's + * no external power applied and the battery voltage is below + * Vsys. this isn't a problem when used for clearing the dead + * battery flag though, since it's certain that there's an external + * power applied in this case + */ + val = dm_i2c_reg_read(udev, 0x0e) & 0x7f; + if (val == 0x00 || val == 0x7f) + return false; + + return true; +} + +/* + * set some safe defaults for the battery charger + */ +int init_charger_bq25895(void) +{ + u8 val; + int iinlim, ret; + struct udevice *udev, *bus; + + /* Set the i2c bus */ + ret = uclass_get_device_by_seq(UCLASS_I2C, 3, &bus); + if (ret) { + log_debug("%s: No bus 3\n", __func__); + return ret; + } + + ret = i2c_get_chip(bus, 0x6a, 1, &udev); + if (ret) { + log_debug("%s: setting chip offset failed %d\n", __func__, ret); + return ret; + } + + val = dm_i2c_reg_read(udev, 0x0b); + log_debug("REG0B 0x%x\n", val); + + log_debug("VBUS_STAT 0x%x\n", val >> 5); + switch (val >> 5) { + case 0: + log_debug("VBUS not detected\n"); + break; + case 1: + log_debug("USB SDP IINLIM 500mA\n"); + break; + case 2: + log_debug("USB CDP IINLIM 1500mA\n"); + break; + case 3: + log_debug("USB DCP IINLIM 3500mA\n"); + break; + case 4: + log_debug("MAXCHARGE IINLIM 1500mA\n"); + break; + case 5: + log_debug("Unknown IINLIM 500mA\n"); + break; + case 6: + log_debug("DIVIDER IINLIM > 1000mA\n"); + break; + case 7: + log_debug("OTG\n"); + break; + }; + + log_debug("CHRG_STAT 0x%x\n", (val >> 3) & 0x3); + log_debug("PG_STAT 0x%x\n", (val >> 2) & 1); + log_debug("SDP_STAT 0x%x\n", (val >> 1) & 1); + log_debug("VSYS_STAT 0x%x\n", val & 1); + + val = dm_i2c_reg_read(udev, 0x00); + log_debug("REG00 0x%x\n", val); + iinlim = 100 + (val & 0x3f) * 50; + log_debug("IINLIM %d mA\n", iinlim); + log_debug("EN_HIZ 0x%x\n", (val >> 7) & 1); + log_debug("EN_ILIM 0x%x\n", (val >> 6) & 1); + + /* set 1.6A charge limit */ + dm_i2c_reg_write(udev, 0x04, 0x19); + + /* re-enable charger */ + val = dm_i2c_reg_read(udev, 0x03); + val = val | 0x10; + dm_i2c_reg_write(udev, 0x03, val); + + return 0; +} + +int board_init(void) +{ + struct udevice *dev; + int tps_ret; + + if (IS_ENABLED(CONFIG_USB_DWC3) || IS_ENABLED(CONFIG_USB_XHCI_IMX8M)) { + log_debug("%s: initializing USB clk\n", __func__); + + /* init_usb_clk won't enable the second clock if it's a USB boot */ + if (is_usb_boot()) { + clock_enable(CCGR_USB_CTRL2, 1); + clock_enable(CCGR_USB_PHY2, 1); + } + + printf("Enabling regulator-hub\n"); + if (!regulator_get_by_devname("regulator-hub", &dev)) { + if (regulator_set_enable(dev, true)) + pr_err("Failed to enable regulator-hub\n"); + } + } + + tps_ret = init_tps65982(); + init_charger_bq25895(); + + if (!tps_ret) { + int current = tps65982_get_max_current(); + + if (current > 500) + bq25895_set_iinlim(current); + + if (bq25895_battery_present()) + tps65982_clear_dead_battery(); + } + + return 0; +} + +int board_late_init(void) +{ + if (IS_ENABLED(CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG)) { + u32 rev; + char rev_str[3]; + + env_set("board_name", "librem5"); + if (fuse_read(9, 0, &rev)) { + env_set("board_rev", BOARD_REV_ERROR); + } else if (rev == 0) { + env_set("board_rev", BOARD_REV_UNKNOWN); + } else if (rev > 0) { + sprintf(rev_str, "%u", rev); + env_set("board_rev", rev_str); + } + + printf("Board name: %s\n", env_get("board_name")); + printf("Board rev: %s\n", env_get("board_rev")); + } + + if (is_usb_boot()) { + puts("USB Boot\n"); + env_set("bootcmd", "fastboot 0"); + } + + return 0; +} |