From 91559ced47de9e6fb1e6dd65a5544fcc86dea806 Mon Sep 17 00:00:00 2001 From: Emil Renner Berthing Date: Sat, 20 Nov 2021 19:30:49 +0100 Subject: [PATCH 1014/1024] reset: starfive: Add JH7100 audio reset driver The audio resets are almost identical to the system resets, there are just fewer of them. So factor out and export a generic probe function, so most of the reset controller implementation can be shared. Signed-off-by: Emil Renner Berthing --- MAINTAINERS | 2 +- drivers/reset/starfive/Kconfig | 7 ++ drivers/reset/starfive/Makefile | 2 + .../starfive/reset-starfive-jh7100-audio.c | 66 +++++++++++++++++++ .../reset/starfive/reset-starfive-jh7100.h | 16 +++++ 5 files changed, 92 insertions(+), 1 deletion(-) create mode 100644 drivers/reset/starfive/reset-starfive-jh7100-audio.c create mode 100644 drivers/reset/starfive/reset-starfive-jh7100.h --- a/MAINTAINERS +++ b/MAINTAINERS @@ -20554,7 +20554,7 @@ STARFIVE JH71X0 RESET CONTROLLER DRIVERS M: Emil Renner Berthing M: Hal Feng S: Maintained -F: Documentation/devicetree/bindings/reset/starfive,jh7100-reset.yaml +F: Documentation/devicetree/bindings/reset/starfive,jh7100-*.yaml F: drivers/reset/starfive/reset-starfive-jh71* F: include/dt-bindings/reset/starfive?jh71*.h --- a/drivers/reset/starfive/Kconfig +++ b/drivers/reset/starfive/Kconfig @@ -11,6 +11,13 @@ config RESET_STARFIVE_JH7100 help This enables the reset controller driver for the StarFive JH7100 SoC. +config RESET_STARFIVE_JH7100_AUDIO + tristate "StarFive JH7100 Audio Reset Driver" + depends on RESET_STARFIVE_JH7100 + default m if SOC_STARFIVE + help + This enables the audio reset driver for the StarFive JH7100 SoC. + config RESET_STARFIVE_JH7110 bool "StarFive JH7110 Reset Driver" depends on CLK_STARFIVE_JH7110_SYS --- a/drivers/reset/starfive/Makefile +++ b/drivers/reset/starfive/Makefile @@ -2,4 +2,6 @@ obj-$(CONFIG_RESET_STARFIVE_JH71X0) += reset-starfive-jh71x0.o obj-$(CONFIG_RESET_STARFIVE_JH7100) += reset-starfive-jh7100.o +obj-$(CONFIG_RESET_STARFIVE_JH7100_AUDIO) += reset-starfive-jh7100-audio.o + obj-$(CONFIG_RESET_STARFIVE_JH7110) += reset-starfive-jh7110.o --- /dev/null +++ b/drivers/reset/starfive/reset-starfive-jh7100-audio.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Audio reset driver for the StarFive JH7100 SoC + * + * Copyright (C) 2021 Emil Renner Berthing + */ + +#include +#include +#include + +#include "reset-starfive-jh71x0.h" + +#include + +/* register offsets */ +#define JH7100_AUDRST_ASSERT0 0x00 +#define JH7100_AUDRST_STATUS0 0x04 + +/* + * Writing a 1 to the n'th bit of the ASSERT register asserts + * line n, and writing a 0 deasserts the same line. + * Most reset lines have their status inverted so a 0 bit in the STATUS + * register means the line is asserted and a 1 means it's deasserted. A few + * lines don't though, so store the expected value of the status registers when + * all lines are asserted. + */ +static const u32 jh7100_audrst_asserted[1] = { + BIT(JH7100_AUDRST_USB_AXI) | + BIT(JH7100_AUDRST_USB_PWRUP_RST_N) | + BIT(JH7100_AUDRST_USB_PONRST) +}; + +static int jh7100_audrst_probe(struct platform_device *pdev) +{ + void __iomem *base = devm_platform_ioremap_resource(pdev, 0); + + if (IS_ERR(base)) + return PTR_ERR(base); + + return reset_starfive_jh71x0_register(&pdev->dev, pdev->dev.of_node, + base + JH7100_AUDRST_ASSERT0, + base + JH7100_AUDRST_STATUS0, + jh7100_audrst_asserted, + JH7100_AUDRSTN_END, + THIS_MODULE); +} + +static const struct of_device_id jh7100_audrst_dt_ids[] = { + { .compatible = "starfive,jh7100-audrst" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, jh7100_audrst_dt_ids); + +static struct platform_driver jh7100_audrst_driver = { + .probe = jh7100_audrst_probe, + .driver = { + .name = "jh7100-reset-audio", + .of_match_table = jh7100_audrst_dt_ids, + }, +}; +module_platform_driver(jh7100_audrst_driver); + +MODULE_AUTHOR("Emil Renner Berthing"); +MODULE_DESCRIPTION("StarFive JH7100 audio reset driver"); +MODULE_LICENSE("GPL"); --- /dev/null +++ b/drivers/reset/starfive/reset-starfive-jh7100.h @@ -0,0 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2021 Emil Renner Berthing + */ + +#ifndef _RESET_STARFIVE_JH7100_H_ +#define _RESET_STARFIVE_JH7100_H_ + +#include + +int reset_starfive_jh7100_generic_probe(struct platform_device *pdev, + const u32 *asserted, + unsigned int status_offset, + unsigned int nr_resets); + +#endif