| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2023 Linaro Ltd. |
| * Author: Sam Protsenko <semen.protsenko@linaro.org> |
| * |
| * Exynos PMU (Power Management Unit) driver. |
| */ |
| |
| #include <dm.h> |
| #include <errno.h> |
| #include <regmap.h> |
| #include <syscon.h> |
| #include <linux/bitops.h> |
| #include <linux/err.h> |
| |
| #define EXYNOS850_UART_IO_SHARE_CTRL 0x0760 |
| #define SEL_RXD_AP_UART_SHIFT 16 |
| #define SEL_RXD_AP_UART_MASK GENMASK(17, 16) |
| #define SEL_TXD_GPIO_1_SHIFT 20 |
| #define SEL_TXD_GPIO_1_MASK GENMASK(21, 20) |
| #define RXD_GPIO_1 0x3 |
| #define TXD_AP_UART 0x0 |
| |
| struct exynos_pmu { |
| struct udevice *dev; |
| const struct exynos_pmu_data *pmu_data; |
| struct regmap *regmap; |
| }; |
| |
| struct exynos_pmu_data { |
| int (*pmu_init)(struct exynos_pmu *priv); |
| }; |
| |
| static int exynos850_pmu_init(struct exynos_pmu *priv) |
| { |
| ofnode node; |
| bool uart_debug_1; |
| unsigned int offset, mask, value; |
| |
| node = dev_ofnode(priv->dev); |
| uart_debug_1 = ofnode_read_bool(node, "samsung,uart-debug-1"); |
| if (!uart_debug_1) |
| return 0; |
| |
| /* |
| * If uart1_pins are used for serial, AP UART lines have to be muxed |
| * in PMU block to UART_DEBUG_1 path (GPIO_1). By default (reset value) |
| * UART_DEBUG_0 path (uart0_pins) is connected to AP UART lines. |
| */ |
| offset = EXYNOS850_UART_IO_SHARE_CTRL; |
| mask = SEL_RXD_AP_UART_MASK | SEL_TXD_GPIO_1_MASK; |
| value = RXD_GPIO_1 << SEL_RXD_AP_UART_SHIFT | |
| TXD_AP_UART << SEL_TXD_GPIO_1_SHIFT; |
| return regmap_update_bits(priv->regmap, offset, mask, value); |
| } |
| |
| static const struct exynos_pmu_data exynos850_pmu_data = { |
| .pmu_init = exynos850_pmu_init, |
| }; |
| |
| static int exynos_pmu_bind(struct udevice *dev) |
| { |
| dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND); |
| return 0; |
| } |
| |
| static int exynos_pmu_probe(struct udevice *dev) |
| { |
| ofnode node; |
| struct exynos_pmu *priv; |
| |
| priv = dev_get_priv(dev); |
| priv->dev = dev; |
| |
| node = dev_ofnode(dev); |
| priv->regmap = syscon_node_to_regmap(node); |
| if (IS_ERR(priv->regmap)) |
| return PTR_ERR(priv->regmap); |
| |
| priv->pmu_data = (struct exynos_pmu_data *)dev_get_driver_data(dev); |
| if (priv->pmu_data && priv->pmu_data->pmu_init) |
| return priv->pmu_data->pmu_init(priv); |
| |
| return 0; |
| } |
| |
| static const struct udevice_id exynos_pmu_ids[] = { |
| { |
| .compatible = "samsung,exynos850-pmu", |
| .data = (ulong)&exynos850_pmu_data |
| }, |
| { /* sentinel */ } |
| }; |
| |
| U_BOOT_DRIVER(exynos_pmu) = { |
| .name = "exynos-pmu", |
| .id = UCLASS_NOP, |
| .of_match = exynos_pmu_ids, |
| .bind = exynos_pmu_bind, |
| .probe = exynos_pmu_probe, |
| .priv_auto = sizeof(struct exynos_pmu), |
| }; |