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8fd06aeb8a
Add basic Power Management Unit (PMU) driver for Exynos SoCs. For now it's only capable of changing UART path in PMU, which is needed for E850-96 board. The driver's structure resembles the exynos-pmu driver from Linux kernel, and although it's very basic and slim at the moment, it can be easily extended in future if the need arises. UCLASS_NOP is used, as there are no benefits in using more elaborate classes like UCLASS_MISC in this case. The DM_FLAG_PROBE_AFTER_BIND flag is added in bind function, as the probe function must be always called for this driver. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Chanho Park <chanho61.park@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2023 Linaro Ltd.
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* Author: Sam Protsenko <semen.protsenko@linaro.org>
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*
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* Exynos PMU (Power Management Unit) driver.
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*/
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#include <dm.h>
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#include <errno.h>
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#include <regmap.h>
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#include <syscon.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#define EXYNOS850_UART_IO_SHARE_CTRL 0x0760
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#define SEL_RXD_AP_UART_SHIFT 16
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#define SEL_RXD_AP_UART_MASK GENMASK(17, 16)
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#define SEL_TXD_GPIO_1_SHIFT 20
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#define SEL_TXD_GPIO_1_MASK GENMASK(21, 20)
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#define RXD_GPIO_1 0x3
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#define TXD_AP_UART 0x0
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struct exynos_pmu {
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struct udevice *dev;
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const struct exynos_pmu_data *pmu_data;
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struct regmap *regmap;
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};
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struct exynos_pmu_data {
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int (*pmu_init)(struct exynos_pmu *priv);
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};
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static int exynos850_pmu_init(struct exynos_pmu *priv)
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{
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ofnode node;
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bool uart_debug_1;
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unsigned int offset, mask, value;
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node = dev_ofnode(priv->dev);
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uart_debug_1 = ofnode_read_bool(node, "samsung,uart-debug-1");
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if (!uart_debug_1)
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return 0;
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/*
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* If uart1_pins are used for serial, AP UART lines have to be muxed
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* in PMU block to UART_DEBUG_1 path (GPIO_1). By default (reset value)
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* UART_DEBUG_0 path (uart0_pins) is connected to AP UART lines.
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*/
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offset = EXYNOS850_UART_IO_SHARE_CTRL;
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mask = SEL_RXD_AP_UART_MASK | SEL_TXD_GPIO_1_MASK;
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value = RXD_GPIO_1 << SEL_RXD_AP_UART_SHIFT |
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TXD_AP_UART << SEL_TXD_GPIO_1_SHIFT;
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return regmap_update_bits(priv->regmap, offset, mask, value);
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}
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static const struct exynos_pmu_data exynos850_pmu_data = {
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.pmu_init = exynos850_pmu_init,
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};
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static int exynos_pmu_bind(struct udevice *dev)
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{
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dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND);
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return 0;
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}
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static int exynos_pmu_probe(struct udevice *dev)
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{
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ofnode node;
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struct exynos_pmu *priv;
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priv = dev_get_priv(dev);
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priv->dev = dev;
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node = dev_ofnode(dev);
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priv->regmap = syscon_node_to_regmap(node);
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if (IS_ERR(priv->regmap))
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return PTR_ERR(priv->regmap);
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priv->pmu_data = (struct exynos_pmu_data *)dev_get_driver_data(dev);
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if (priv->pmu_data && priv->pmu_data->pmu_init)
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return priv->pmu_data->pmu_init(priv);
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return 0;
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}
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static const struct udevice_id exynos_pmu_ids[] = {
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{
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.compatible = "samsung,exynos850-pmu",
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.data = (ulong)&exynos850_pmu_data
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},
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(exynos_pmu) = {
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.name = "exynos-pmu",
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.id = UCLASS_NOP,
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.of_match = exynos_pmu_ids,
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.bind = exynos_pmu_bind,
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.probe = exynos_pmu_probe,
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.priv_auto = sizeof(struct exynos_pmu),
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};
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