^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2014 STMicroelectronics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Power off Restart driver, used in STMicroelectronics devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Christophe Kerello <christophe.kerello@st.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mfd/syscon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct reset_syscfg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /* syscfg used for reset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) unsigned int offset_rst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) unsigned int mask_rst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) /* syscfg used for unmask the reset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) unsigned int offset_rst_msk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) unsigned int mask_rst_msk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /* STiH407 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define STIH407_SYSCFG_4000 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define STIH407_SYSCFG_4008 0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static struct reset_syscfg stih407_reset = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) .offset_rst = STIH407_SYSCFG_4000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) .mask_rst = BIT(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) .offset_rst_msk = STIH407_SYSCFG_4008,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) .mask_rst_msk = BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static struct reset_syscfg *st_restart_syscfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static int st_restart(struct notifier_block *this, unsigned long mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) void *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* reset syscfg updated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) regmap_update_bits(st_restart_syscfg->regmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) st_restart_syscfg->offset_rst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) st_restart_syscfg->mask_rst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* unmask the reset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) regmap_update_bits(st_restart_syscfg->regmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) st_restart_syscfg->offset_rst_msk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) st_restart_syscfg->mask_rst_msk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static struct notifier_block st_restart_nb = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) .notifier_call = st_restart,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) .priority = 192,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static const struct of_device_id st_reset_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) .compatible = "st,stih407-restart",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) .data = (void *)&stih407_reset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static int st_reset_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) const struct of_device_id *match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) match = of_match_device(st_reset_of_match, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (!match)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) st_restart_syscfg = (struct reset_syscfg *)match->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) st_restart_syscfg->regmap =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) syscon_regmap_lookup_by_phandle(np, "st,syscfg");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (IS_ERR(st_restart_syscfg->regmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) dev_err(dev, "No syscfg phandle specified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return PTR_ERR(st_restart_syscfg->regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return register_restart_handler(&st_restart_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static struct platform_driver st_reset_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .probe = st_reset_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .name = "st_reset",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) .of_match_table = st_reset_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static int __init st_reset_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return platform_driver_register(&st_reset_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) device_initcall(st_reset_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) MODULE_DESCRIPTION("STMicroelectronics Power off Restart driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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