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psci_fdt.c revision 1.20 
      1 /* $NetBSD: psci_fdt.c,v 1.20 2021/01/27 03:10:19 thorpej 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 1.20 2021/01/27 03:10:19 thorpej 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/psci.h>
     44 #include <arm/fdt/psci_fdtvar.h>
     45 
     46 static int	psci_fdt_match(device_t, cfdata_t, void *);
     47 static void	psci_fdt_attach(device_t, device_t, void *);
     48 
     49 static int	psci_fdt_init(const int);
     50 
     51 static const struct device_compatible_entry compat_data[] = {
     52 	{ .compat = "arm,psci" },
     53 	{ .compat = "arm,psci-0.2" },
     54 	{ .compat = "arm,psci-1.0" },
     55 	DEVICE_COMPAT_EOL
     56 };
     57 
     58 CFATTACH_DECL_NEW(psci_fdt, 0, psci_fdt_match, psci_fdt_attach, NULL, NULL);
     59 
     60 static void
     61 psci_fdt_power_reset(device_t dev)
     62 {
     63 	delay(500000);
     64 	psci_system_reset();
     65 }
     66 
     67 static void
     68 psci_fdt_power_poweroff(device_t dev)
     69 {
     70 	delay(500000);
     71 	psci_system_off();
     72 }
     73 
     74 static const struct fdtbus_power_controller_func psci_power_funcs = {
     75 	.reset = psci_fdt_power_reset,
     76 	.poweroff = psci_fdt_power_poweroff,
     77 };
     78 
     79 static int
     80 psci_fdt_match(device_t parent, cfdata_t cf, void *aux)
     81 {
     82 	struct fdt_attach_args * const faa = aux;
     83 
     84 	return of_compatible_match(faa->faa_phandle, compat_data);
     85 }
     86 
     87 static void
     88 psci_fdt_attach(device_t parent, device_t self, void *aux)
     89 {
     90 	struct fdt_attach_args * const faa = aux;
     91 	const int phandle = faa->faa_phandle;
     92 
     93 	psci_fdt_init(phandle);
     94 
     95 	const uint32_t ver = psci_version();
     96 	const u_int ver_maj = __SHIFTOUT(ver, PSCI_VERSION_MAJOR);
     97 	const u_int ver_min = __SHIFTOUT(ver, PSCI_VERSION_MINOR);
     98 
     99 	aprint_naive("\n");
    100 	aprint_normal(": PSCI %u.%u\n", ver_maj, ver_min);
    101 
    102 	fdtbus_register_power_controller(self, phandle,
    103 	    &psci_power_funcs);
    104 }
    105 
    106 static int
    107 psci_fdt_init(const int phandle)
    108 {
    109 	const char *method, *psciver;
    110 	uint32_t val;
    111 
    112 	method = fdtbus_get_string(phandle, "method");
    113 	psciver = fdtbus_get_string(phandle, "compatible");
    114 	if (method == NULL || psciver == NULL) {
    115 		aprint_error("PSCI: missing required property on /psci\n");
    116 		return EINVAL;
    117 	}
    118 
    119 	if (strcmp(method, "smc") == 0)
    120 		psci_init(psci_call_smc);
    121 	else if (strcmp(method, "hvc") == 0)
    122 		psci_init(psci_call_hvc);
    123 	else {
    124 		aprint_error("PSCI: unsupported method '%s'\n", method);
    125 		return EINVAL;
    126 	}
    127 
    128 	/*
    129 	 * If the first compatible string is "arm,psci" then we
    130 	 * are dealing with PSCI 0.1
    131 	 */
    132 	if (strcmp(psciver, "arm,psci") == 0) {
    133 		psci_clearfunc();
    134 		if (of_getprop_uint32(phandle, "cpu_on", &val) == 0)
    135 			psci_setfunc(PSCI_FUNC_CPU_ON, val);
    136 	}
    137 
    138 	return 0;
    139 }
    140 
    141 int
    142 psci_fdt_preinit(void)
    143 {
    144 	const int phandle = OF_finddevice("/psci");
    145 	if (phandle == -1) {
    146 		aprint_error("PSCI: no /psci node found\n");
    147 		return ENODEV;
    148 	}
    149 
    150 	return psci_fdt_init(phandle);
    151 }
    152 
    153 void
    154 psci_fdt_reset(void)
    155 {
    156 	if (psci_fdt_preinit() != 0) {
    157 		aprint_error("PSCI: reset failed\n");
    158 		return;
    159 	}
    160 
    161 	psci_system_reset();
    162 }
    163