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119 lines
3.6 KiB
119 lines
3.6 KiB
/*
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* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <console.h>
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#include <debug.h>
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#include <libfdt.h>
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#include <psci.h>
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#include "qemu_private.h"
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#include <string.h>
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static int append_psci_compatible(void *fdt, int offs, const char *str)
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{
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return fdt_appendprop(fdt, offs, "compatible", str, strlen(str) + 1);
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}
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int dt_add_psci_node(void *fdt)
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{
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int offs;
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if (fdt_path_offset(fdt, "/psci") >= 0) {
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WARN("PSCI Device Tree node already exists!\n");
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return 0;
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}
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offs = fdt_path_offset(fdt, "/");
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if (offs < 0)
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return -1;
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offs = fdt_add_subnode(fdt, offs, "psci");
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if (offs < 0)
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return -1;
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if (append_psci_compatible(fdt, offs, "arm,psci-1.0"))
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return -1;
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if (append_psci_compatible(fdt, offs, "arm,psci-0.2"))
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return -1;
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if (append_psci_compatible(fdt, offs, "arm,psci"))
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return -1;
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if (fdt_setprop_string(fdt, offs, "method", "smc"))
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return -1;
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if (fdt_setprop_u32(fdt, offs, "cpu_suspend", PSCI_CPU_SUSPEND_AARCH64))
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return -1;
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if (fdt_setprop_u32(fdt, offs, "cpu_off", PSCI_CPU_OFF))
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return -1;
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if (fdt_setprop_u32(fdt, offs, "cpu_on", PSCI_CPU_ON_AARCH64))
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return -1;
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if (fdt_setprop_u32(fdt, offs, "sys_poweroff", PSCI_SYSTEM_OFF))
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return -1;
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if (fdt_setprop_u32(fdt, offs, "sys_reset", PSCI_SYSTEM_RESET))
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return -1;
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return 0;
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}
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static int check_node_compat_prefix(void *fdt, int offs, const char *prefix)
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{
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const size_t prefix_len = strlen(prefix);
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size_t l;
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int plen;
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const char *prop;
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prop = fdt_getprop(fdt, offs, "compatible", &plen);
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if (!prop)
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return -1;
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while (plen > 0) {
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if (memcmp(prop, prefix, prefix_len) == 0)
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return 0; /* match */
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l = strlen(prop) + 1;
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prop += l;
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plen -= l;
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}
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return -1;
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}
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int dt_add_psci_cpu_enable_methods(void *fdt)
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{
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int offs = 0;
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while (1) {
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offs = fdt_next_node(fdt, offs, NULL);
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if (offs < 0)
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break;
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if (fdt_getprop(fdt, offs, "enable-method", NULL))
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continue; /* already set */
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if (check_node_compat_prefix(fdt, offs, "arm,cortex-a"))
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continue; /* no compatible */
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if (fdt_setprop_string(fdt, offs, "enable-method", "psci"))
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return -1;
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/* Need to restart scanning as offsets may have changed */
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offs = 0;
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}
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return 0;
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}
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