diff options
Diffstat (limited to 'drivers/clk/mediatek/clk-mt8186-mcu.c')
| -rw-r--r-- | drivers/clk/mediatek/clk-mt8186-mcu.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/clk/mediatek/clk-mt8186-mcu.c b/drivers/clk/mediatek/clk-mt8186-mcu.c new file mode 100644 index 000000000..dfc305c1f --- /dev/null +++ b/drivers/clk/mediatek/clk-mt8186-mcu.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// Copyright (c) 2022 MediaTek Inc. +// Author: Chun-Jie Chen <chun-jie.chen@mediatek.com> + +#include <linux/clk-provider.h> +#include <linux/platform_device.h> +#include <dt-bindings/clock/mt8186-clk.h> + +#include "clk-mtk.h" + +static const char * const mcu_armpll_ll_parents[] = { + "clk26m", + "armpll_ll", + "mainpll", + "univpll_d2" +}; + +static const char * const mcu_armpll_bl_parents[] = { + "clk26m", + "armpll_bl", + "mainpll", + "univpll_d2" +}; + +static const char * const mcu_armpll_bus_parents[] = { + "clk26m", + "ccipll", + "mainpll", + "univpll_d2" +}; + +/* + * We only configure the CPU muxes when adjust CPU frequency in MediaTek CPUFreq Driver. + * Other fields like divider always keep the same value. (set once in bootloader) + */ +static struct mtk_composite mcu_muxes[] = { + /* CPU_PLLDIV_CFG0 */ + MUX(CLK_MCU_ARMPLL_LL_SEL, "mcu_armpll_ll_sel", mcu_armpll_ll_parents, 0x2A0, 9, 2), + /* CPU_PLLDIV_CFG1 */ + MUX(CLK_MCU_ARMPLL_BL_SEL, "mcu_armpll_bl_sel", mcu_armpll_bl_parents, 0x2A4, 9, 2), + /* BUS_PLLDIV_CFG */ + MUX(CLK_MCU_ARMPLL_BUS_SEL, "mcu_armpll_bus_sel", mcu_armpll_bus_parents, 0x2E0, 9, 2), +}; + +static const struct of_device_id of_match_clk_mt8186_mcu[] = { + { .compatible = "mediatek,mt8186-mcusys", }, + {} +}; + +static int clk_mt8186_mcu_probe(struct platform_device *pdev) +{ + struct clk_hw_onecell_data *clk_data; + struct device_node *node = pdev->dev.of_node; + int r; + void __iomem *base; + + clk_data = mtk_alloc_clk_data(CLK_MCU_NR_CLK); + if (!clk_data) + return -ENOMEM; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) { + r = PTR_ERR(base); + goto free_mcu_data; + } + + r = mtk_clk_register_composites(mcu_muxes, ARRAY_SIZE(mcu_muxes), base, + NULL, clk_data); + if (r) + goto free_mcu_data; + + r = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data); + if (r) + goto unregister_composite_muxes; + + platform_set_drvdata(pdev, clk_data); + + return r; + +unregister_composite_muxes: + mtk_clk_unregister_composites(mcu_muxes, ARRAY_SIZE(mcu_muxes), clk_data); +free_mcu_data: + mtk_free_clk_data(clk_data); + return r; +} + +static int clk_mt8186_mcu_remove(struct platform_device *pdev) +{ + struct clk_hw_onecell_data *clk_data = platform_get_drvdata(pdev); + struct device_node *node = pdev->dev.of_node; + + of_clk_del_provider(node); + mtk_clk_unregister_composites(mcu_muxes, ARRAY_SIZE(mcu_muxes), clk_data); + mtk_free_clk_data(clk_data); + + return 0; +} + +static struct platform_driver clk_mt8186_mcu_drv = { + .probe = clk_mt8186_mcu_probe, + .remove = clk_mt8186_mcu_remove, + .driver = { + .name = "clk-mt8186-mcu", + .of_match_table = of_match_clk_mt8186_mcu, + }, +}; +builtin_platform_driver(clk_mt8186_mcu_drv); |