^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) * arch/arm/mach-u300/regulator.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2009 ST-Ericsson AB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Handle board-bound regulators and board power not related
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * to any devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Author: Linus Walleij <linus.walleij@stericsson.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/regulator/machine.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/mfd/syscon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /* Power Management Control 16bit (R/W) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define U300_SYSCON_PMCR (0x50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define U300_SYSCON_PMCR_DCON_ENABLE (0x0002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define U300_SYSCON_PMCR_PWR_MGNT_ENABLE (0x0001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Regulators that power the board and chip and which are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * not copuled to specific drivers are hogged in these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * instances.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static struct regulator *main_power_15;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * This function is used from pm.h to shut down the system by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * resetting all regulators in turn and then disable regulator
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * LDO D (main power).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) void u300_pm_poweroff(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) sigset_t old, all;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) sigfillset(&all);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (!sigprocmask(SIG_BLOCK, &all, &old)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /* Disable LDO D to shut down the system */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (main_power_15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) regulator_disable(main_power_15);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) pr_err("regulator not available to shut down system\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) (void) sigprocmask(SIG_SETMASK, &old, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Hog the regulators needed to power up the board.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static int __init __u300_init_boardpower(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct device_node *syscon_np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) pr_info("U300: setting up board power\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) syscon_np = of_parse_phandle(np, "syscon", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (!syscon_np) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) pr_crit("U300: no syscon node\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) regmap = syscon_node_to_regmap(syscon_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (IS_ERR(regmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) pr_crit("U300: could not locate syscon regmap\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return PTR_ERR(regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) main_power_15 = regulator_get(&pdev->dev, "vana15");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (IS_ERR(main_power_15)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) pr_err("could not get vana15");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return PTR_ERR(main_power_15);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) err = regulator_enable(main_power_15);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) pr_err("could not enable vana15\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * On U300 a special system controller register pulls up the DC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * until the vana15 (LDO D) regulator comes up. At this point, all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * regulators are set and we do not need power control via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * DC ON anymore. This function will likely be moved whenever
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * the rest of the U300 power management is implemented.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) pr_info("U300: disable system controller pull-up\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) regmap_update_bits(regmap, U300_SYSCON_PMCR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) U300_SYSCON_PMCR_DCON_ENABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /* Register globally exported PM poweroff hook */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) pm_power_off = u300_pm_poweroff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static int __init s365_board_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return __u300_init_boardpower(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static const struct of_device_id s365_board_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) { .compatible = "stericsson,s365" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static struct platform_driver s365_board_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) .name = "s365-board",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) .of_match_table = s365_board_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * So at module init time we hog the regulator!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int __init u300_init_boardpower(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return platform_driver_probe(&s365_board_driver,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) s365_board_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) device_initcall(u300_init_boardpower);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) MODULE_AUTHOR("Linus Walleij");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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