96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
/*
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* Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
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*
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* Based on drivers/firmware/psci.c from Linux:
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* Copyright (C) 2015 ARM Limited
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <dm/lists.h>
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#include <libfdt.h>
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#include <linux/arm-smccc.h>
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#include <linux/errno.h>
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#include <linux/printk.h>
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#include <linux/psci.h>
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psci_fn *invoke_psci_fn;
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static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
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unsigned long arg0, unsigned long arg1,
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unsigned long arg2)
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{
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struct arm_smccc_res res;
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arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
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return res.a0;
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}
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static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
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unsigned long arg0, unsigned long arg1,
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unsigned long arg2)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
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return res.a0;
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}
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static int psci_bind(struct udevice *dev)
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{
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/* No SYSTEM_RESET support for PSCI 0.1 */
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if (device_is_compatible(dev, "arm,psci-0.2") ||
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device_is_compatible(dev, "arm,psci-1.0")) {
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int ret;
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/* bind psci-sysreset optionally */
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ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset",
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NULL);
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if (ret)
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pr_debug("PSCI System Reset was not bound.\n");
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}
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return 0;
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}
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static int psci_probe(struct udevice *dev)
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{
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DECLARE_GLOBAL_DATA_PTR;
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const char *method;
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method = fdt_stringlist_get(gd->fdt_blob, dev_of_offset(dev), "method",
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0, NULL);
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if (!method) {
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pr_warn("missing \"method\" property\n");
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return -ENXIO;
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}
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if (!strcmp("hvc", method)) {
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invoke_psci_fn = __invoke_psci_fn_hvc;
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} else if (!strcmp("smc", method)) {
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invoke_psci_fn = __invoke_psci_fn_smc;
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} else {
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pr_warn("invalid \"method\" property: %s\n", method);
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return -EINVAL;
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}
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return 0;
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}
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static const struct udevice_id psci_of_match[] = {
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{ .compatible = "arm,psci" },
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{ .compatible = "arm,psci-0.2" },
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{ .compatible = "arm,psci-1.0" },
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{},
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};
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U_BOOT_DRIVER(psci) = {
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.name = "psci",
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.id = UCLASS_FIRMWARE,
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.of_match = psci_of_match,
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.bind = psci_bind,
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.probe = psci_probe,
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};
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