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| Commit | Line | Data |
|---|---|---|
| 573a3811 MY |
1 | /* |
| 2 | * Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com> | |
| 3 | * | |
| 4 | * Based on drivers/firmware/psci.c from Linux: | |
| 5 | * Copyright (C) 2015 ARM Limited | |
| 6 | * | |
| 7 | * SPDX-License-Identifier: GPL-2.0+ | |
| 8 | */ | |
| 9 | ||
| 10 | #include <common.h> | |
| 9d922450 | 11 | #include <dm.h> |
| 573a3811 MY |
12 | #include <dm/lists.h> |
| 13 | #include <libfdt.h> | |
| 14 | #include <linux/arm-smccc.h> | |
| 15 | #include <linux/errno.h> | |
| af4e6d3a | 16 | #include <linux/printk.h> |
| 573a3811 MY |
17 | #include <linux/psci.h> |
| 18 | ||
| 19 | psci_fn *invoke_psci_fn; | |
| 20 | ||
| 21 | static unsigned long __invoke_psci_fn_hvc(unsigned long function_id, | |
| 22 | unsigned long arg0, unsigned long arg1, | |
| 23 | unsigned long arg2) | |
| 24 | { | |
| 25 | struct arm_smccc_res res; | |
| 26 | ||
| 27 | arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
| 28 | return res.a0; | |
| 29 | } | |
| 30 | ||
| 31 | static unsigned long __invoke_psci_fn_smc(unsigned long function_id, | |
| 32 | unsigned long arg0, unsigned long arg1, | |
| 33 | unsigned long arg2) | |
| 34 | { | |
| 35 | struct arm_smccc_res res; | |
| 36 | ||
| 37 | arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
| 38 | return res.a0; | |
| 39 | } | |
| 40 | ||
| 41 | static int psci_bind(struct udevice *dev) | |
| 42 | { | |
| 43 | /* No SYSTEM_RESET support for PSCI 0.1 */ | |
| 911f3aef SG |
44 | if (device_is_compatible(dev, "arm,psci-0.2") || |
| 45 | device_is_compatible(dev, "arm,psci-1.0")) { | |
| 573a3811 MY |
46 | int ret; |
| 47 | ||
| 48 | /* bind psci-sysreset optionally */ | |
| 49 | ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset", | |
| 50 | NULL); | |
| 51 | if (ret) | |
| af4e6d3a | 52 | pr_debug("PSCI System Reset was not bound.\n"); |
| 573a3811 MY |
53 | } |
| 54 | ||
| 55 | return 0; | |
| 56 | } | |
| 57 | ||
| 58 | static int psci_probe(struct udevice *dev) | |
| 59 | { | |
| 60 | DECLARE_GLOBAL_DATA_PTR; | |
| 61 | const char *method; | |
| 62 | ||
| da409ccc SG |
63 | method = fdt_stringlist_get(gd->fdt_blob, dev_of_offset(dev), "method", |
| 64 | 0, NULL); | |
| 573a3811 | 65 | if (!method) { |
| af4e6d3a | 66 | pr_warn("missing \"method\" property\n"); |
| 573a3811 MY |
67 | return -ENXIO; |
| 68 | } | |
| 69 | ||
| 70 | if (!strcmp("hvc", method)) { | |
| 71 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
| 72 | } else if (!strcmp("smc", method)) { | |
| 73 | invoke_psci_fn = __invoke_psci_fn_smc; | |
| 74 | } else { | |
| af4e6d3a | 75 | pr_warn("invalid \"method\" property: %s\n", method); |
| 573a3811 MY |
76 | return -EINVAL; |
| 77 | } | |
| 78 | ||
| 79 | return 0; | |
| 80 | } | |
| 81 | ||
| 82 | static const struct udevice_id psci_of_match[] = { | |
| 83 | { .compatible = "arm,psci" }, | |
| 84 | { .compatible = "arm,psci-0.2" }, | |
| 85 | { .compatible = "arm,psci-1.0" }, | |
| 86 | {}, | |
| 87 | }; | |
| 88 | ||
| 89 | U_BOOT_DRIVER(psci) = { | |
| 90 | .name = "psci", | |
| 91 | .id = UCLASS_FIRMWARE, | |
| 92 | .of_match = psci_of_match, | |
| 93 | .bind = psci_bind, | |
| 94 | .probe = psci_probe, | |
| 95 | }; |