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      1 /* $NetBSD: psci_fdt.c,v 1.21 2021/08/06 19:38:53 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "opt_multiprocessor.h"
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: psci_fdt.c,v 1.21 2021/08/06 19:38:53 jmcneill Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/atomic.h>
     36 #include <sys/bus.h>
     37 #include <sys/device.h>
     38 #include <sys/kernel.h>
     39 #include <sys/systm.h>
     40 
     41 #include <dev/fdt/fdtvar.h>
     42 
     43 #include <arm/arm/smccc.h>
     44 #include <arm/arm/psci.h>
     45 #include <arm/fdt/psci_fdtvar.h>
     46 
     47 static int	psci_fdt_match(device_t, cfdata_t, void *);
     48 static void	psci_fdt_attach(device_t, device_t, void *);
     49 
     50 static int	psci_fdt_init(const int);
     51 
     52 static const struct device_compatible_entry compat_data[] = {
     53 	{ .compat = "arm,psci" },
     54 	{ .compat = "arm,psci-0.2" },
     55 	{ .compat = "arm,psci-1.0" },
     56 	DEVICE_COMPAT_EOL
     57 };
     58 
     59 CFATTACH_DECL_NEW(psci_fdt, 0, psci_fdt_match, psci_fdt_attach, NULL, NULL);
     60 
     61 static void
     62 psci_fdt_power_reset(device_t dev)
     63 {
     64 	delay(500000);
     65 	psci_system_reset();
     66 }
     67 
     68 static void
     69 psci_fdt_power_poweroff(device_t dev)
     70 {
     71 	delay(500000);
     72 	psci_system_off();
     73 }
     74 
     75 static const struct fdtbus_power_controller_func psci_power_funcs = {
     76 	.reset = psci_fdt_power_reset,
     77 	.poweroff = psci_fdt_power_poweroff,
     78 };
     79 
     80 static int
     81 psci_fdt_match(device_t parent, cfdata_t cf, void *aux)
     82 {
     83 	struct fdt_attach_args * const faa = aux;
     84 
     85 	return of_compatible_match(faa->faa_phandle, compat_data);
     86 }
     87 
     88 static void
     89 psci_fdt_attach(device_t parent, device_t self, void *aux)
     90 {
     91 	struct fdt_attach_args * const faa = aux;
     92 	const int phandle = faa->faa_phandle;
     93 
     94 	psci_fdt_init(phandle);
     95 
     96 	const uint32_t ver = psci_version();
     97 	const u_int ver_maj = __SHIFTOUT(ver, PSCI_VERSION_MAJOR);
     98 	const u_int ver_min = __SHIFTOUT(ver, PSCI_VERSION_MINOR);
     99 
    100 	aprint_naive("\n");
    101 	aprint_normal(": PSCI %u.%u\n", ver_maj, ver_min);
    102 
    103 	fdtbus_register_power_controller(self, phandle,
    104 	    &psci_power_funcs);
    105 }
    106 
    107 static int
    108 psci_fdt_init(const int phandle)
    109 {
    110 	const char *method, *psciver;
    111 	uint32_t val;
    112 
    113 	method = fdtbus_get_string(phandle, "method");
    114 	psciver = fdtbus_get_string(phandle, "compatible");
    115 	if (method == NULL || psciver == NULL) {
    116 		aprint_error("PSCI: missing required property on /psci\n");
    117 		return EINVAL;
    118 	}
    119 
    120 	if (strcmp(method, "smc") == 0)
    121 		psci_init(psci_call_smc);
    122 	else if (strcmp(method, "hvc") == 0)
    123 		psci_init(psci_call_hvc);
    124 	else {
    125 		aprint_error("PSCI: unsupported method '%s'\n", method);
    126 		return EINVAL;
    127 	}
    128 
    129 	/*
    130 	 * If the first compatible string is "arm,psci" then we
    131 	 * are dealing with PSCI 0.1
    132 	 */
    133 	if (strcmp(psciver, "arm,psci") == 0) {
    134 		psci_clearfunc();
    135 		if (of_getprop_uint32(phandle, "cpu_on", &val) == 0)
    136 			psci_setfunc(PSCI_FUNC_CPU_ON, val);
    137 	}
    138 
    139 	smccc_probe();
    140 
    141 	return 0;
    142 }
    143 
    144 int
    145 psci_fdt_preinit(void)
    146 {
    147 	const int phandle = OF_finddevice("/psci");
    148 	if (phandle == -1) {
    149 		aprint_error("PSCI: no /psci node found\n");
    150 		return ENODEV;
    151 	}
    152 
    153 	return psci_fdt_init(phandle);
    154 }
    155 
    156 void
    157 psci_fdt_reset(void)
    158 {
    159 	if (psci_fdt_preinit() != 0) {
    160 		aprint_error("PSCI: reset failed\n");
    161 		return;
    162 	}
    163 
    164 	psci_system_reset();
    165 }
    166