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/*
* xen/arch/arm/psci.c
*
* PSCI host support
*
* Andre Przywara <andre.przywara@linaro.org>
* Copyright (c) 2013 Linaro Limited.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <xen/types.h>
#include <xen/init.h>
#include <xen/mm.h>
#include <xen/smp.h>
#include <asm/cpufeature.h>
#include <asm/psci.h>
#include <asm/acpi.h>
/*
* While a 64-bit OS can make calls with SMC32 calling conventions, for
* some calls it is necessary to use SMC64 to pass or return 64-bit values.
* For such calls PSCI_0_2_FN_NATIVE(x) will choose the appropriate
* (native-width) function ID.
*/
#ifdef CONFIG_ARM_64
#define PSCI_0_2_FN_NATIVE(name) PSCI_0_2_FN64_##name
#else
#define PSCI_0_2_FN_NATIVE(name) PSCI_0_2_FN32_##name
#endif
uint32_t psci_ver;
uint32_t smccc_ver;
static uint32_t psci_cpu_on_nr;
#define PSCI_RET(res) ((int32_t)(res).a0)
int call_psci_cpu_on(int cpu)
{
struct arm_smccc_res res;
arm_smccc_smc(psci_cpu_on_nr, cpu_logical_map(cpu), __pa(init_secondary),
&res);
return PSCI_RET(res);
}
void call_psci_cpu_off(void)
{
if ( psci_ver > PSCI_VERSION(0, 1) )
{
struct arm_smccc_res res;
/* If successfull the PSCI cpu_off call doesn't return */
arm_smccc_smc(PSCI_0_2_FN32_CPU_OFF, &res);
panic("PSCI cpu off failed for CPU%d err=%d\n", smp_processor_id(),
PSCI_RET(res));
}
}
void call_psci_system_off(void)
{
if ( psci_ver > PSCI_VERSION(0, 1) )
arm_smccc_smc(PSCI_0_2_FN32_SYSTEM_OFF, NULL);
}
void call_psci_system_reset(void)
{
if ( psci_ver > PSCI_VERSION(0, 1) )
arm_smccc_smc(PSCI_0_2_FN32_SYSTEM_RESET, NULL);
}
static int __init psci_features(uint32_t psci_func_id)
{
struct arm_smccc_res res;
if ( psci_ver < PSCI_VERSION(1, 0) )
return PSCI_NOT_SUPPORTED;
arm_smccc_smc(PSCI_1_0_FN32_PSCI_FEATURES, psci_func_id, &res);
return PSCI_RET(res);
}
static int __init psci_is_smc_method(const struct dt_device_node *psci)
{
int ret;
const char *prop_str;
ret = dt_property_read_string(psci, "method", &prop_str);
if ( ret )
{
printk("/psci node does not provide a method (%d)\n", ret);
return -EINVAL;
}
/* Since Xen runs in HYP all of the time, it does not make sense to
* let it call into HYP for PSCI handling, since the handler just
* won't be there. So bail out with an error if "smc" is not used.
*/
if ( strcmp(prop_str, "smc") )
{
printk("/psci method must be smc, but is: \"%s\"\n", prop_str);
return -EINVAL;
}
return 0;
}
static void __init psci_init_smccc(void)
{
/* PSCI is using at least SMCCC 1.0 calling convention. */
smccc_ver = ARM_SMCCC_VERSION_1_0;
if ( psci_features(ARM_SMCCC_VERSION_FID) != PSCI_NOT_SUPPORTED )
{
struct arm_smccc_res res;
arm_smccc_smc(ARM_SMCCC_VERSION_FID, &res);
if ( PSCI_RET(res) != ARM_SMCCC_NOT_SUPPORTED )
smccc_ver = PSCI_RET(res);
}
if ( smccc_ver >= SMCCC_VERSION(1, 1) )
cpus_set_cap(ARM_SMCCC_1_1);
printk(XENLOG_INFO "Using SMC Calling Convention v%u.%u\n",
SMCCC_VERSION_MAJOR(smccc_ver), SMCCC_VERSION_MINOR(smccc_ver));
}
static int __init psci_init_0_1(void)
{
int ret;
const struct dt_device_node *psci;
if ( !acpi_disabled )
{
printk("PSCI 0.1 is not supported when using ACPI\n");
return -EINVAL;
}
psci = dt_find_compatible_node(NULL, NULL, "arm,psci");
if ( !psci )
return -EOPNOTSUPP;
ret = psci_is_smc_method(psci);
if ( ret )
return -EINVAL;
if ( !dt_property_read_u32(psci, "cpu_on", &psci_cpu_on_nr) )
{
printk("/psci node is missing the \"cpu_on\" property\n");
return -ENOENT;
}
psci_ver = PSCI_VERSION(0, 1);
return 0;
}
static int __init psci_init_0_2(void)
{
static const struct dt_device_match psci_ids[] __initconst =
{
DT_MATCH_COMPATIBLE("arm,psci-0.2"),
DT_MATCH_COMPATIBLE("arm,psci-1.0"),
{ /* sentinel */ },
};
int ret;
struct arm_smccc_res res;
if ( acpi_disabled )
{
const struct dt_device_node *psci;
psci = dt_find_matching_node(NULL, psci_ids);
if ( !psci )
return -EOPNOTSUPP;
ret = psci_is_smc_method(psci);
if ( ret )
return -EINVAL;
}
else
{
if ( acpi_psci_hvc_present() ) {
printk("PSCI conduit must be SMC, but is HVC\n");
return -EINVAL;
}
}
arm_smccc_smc(PSCI_0_2_FN32_PSCI_VERSION, &res);
psci_ver = PSCI_RET(res);
/* For the moment, we only support PSCI 0.2 and PSCI 1.x */
if ( psci_ver != PSCI_VERSION(0, 2) && PSCI_VERSION_MAJOR(psci_ver) != 1 )
{
printk("Error: Unrecognized PSCI version %u.%u\n",
PSCI_VERSION_MAJOR(psci_ver), PSCI_VERSION_MINOR(psci_ver));
return -EOPNOTSUPP;
}
psci_cpu_on_nr = PSCI_0_2_FN_NATIVE(CPU_ON);
return 0;
}
int __init psci_init(void)
{
int ret;
if ( !acpi_disabled && !acpi_psci_present() )
return -EOPNOTSUPP;
ret = psci_init_0_2();
if ( ret )
ret = psci_init_0_1();
if ( ret )
return ret;
psci_init_smccc();
printk(XENLOG_INFO "Using PSCI v%u.%u\n",
PSCI_VERSION_MAJOR(psci_ver), PSCI_VERSION_MINOR(psci_ver));
return 0;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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