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author | Hou Zhiqiang <Zhiqiang.Hou@nxp.com> | 2016-06-28 12:18:16 (GMT) |
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committer | York Sun <york.sun@nxp.com> | 2016-07-19 18:34:07 (GMT) |
commit | 45684ae37bf96b455a1d4a957b80551dc2c85959 (patch) | |
tree | 944aee501a67874cda09a402654e5a29b53128a0 /arch/arm/lib/psci-dt.c | |
parent | 032d5bb4aed40f1d0de0698501fcacee594caabc (diff) | |
download | u-boot-45684ae37bf96b455a1d4a957b80551dc2c85959.tar.xz |
ARMv8/PSCI: Fixup the device tree for PSCI
Set the enable-method in the cpu node to PSCI, and create device
node for PSCI, when PSCI was enabled.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
Diffstat (limited to 'arch/arm/lib/psci-dt.c')
-rw-r--r-- | arch/arm/lib/psci-dt.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/arch/arm/lib/psci-dt.c b/arch/arm/lib/psci-dt.c new file mode 100644 index 0000000..8dc31d4 --- /dev/null +++ b/arch/arm/lib/psci-dt.c @@ -0,0 +1,123 @@ +/* + * Copyright 2016 NXP Semiconductor, Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <libfdt.h> +#include <fdt_support.h> +#include <linux/sizes.h> +#include <linux/kernel.h> +#include <asm/psci.h> +#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT +#include <asm/armv8/sec_firmware.h> +#endif + +int fdt_psci(void *fdt) +{ +#if defined(CONFIG_ARMV8_PSCI) || defined(CONFIG_ARMV7_PSCI) + int nodeoff; + unsigned int psci_ver = 0; + char *psci_compt; + int tmp; + + nodeoff = fdt_path_offset(fdt, "/cpus"); + if (nodeoff < 0) { + printf("couldn't find /cpus\n"); + return nodeoff; + } + + /* add 'enable-method = "psci"' to each cpu node */ + for (tmp = fdt_first_subnode(fdt, nodeoff); + tmp >= 0; + tmp = fdt_next_subnode(fdt, tmp)) { + const struct fdt_property *prop; + int len; + + prop = fdt_get_property(fdt, tmp, "device_type", &len); + if (!prop) + continue; + if (len < 4) + continue; + if (strcmp(prop->data, "cpu")) + continue; + + /* + * Not checking rv here, our approach is to skip over errors in + * individual cpu nodes, hopefully some of the nodes are + * processed correctly and those will boot + */ + fdt_setprop_string(fdt, tmp, "enable-method", "psci"); + } + + /* + * The PSCI node might be called "/psci" or might be called something + * else but contain either of the compatible strings + * "arm,psci"/"arm,psci-0.2" + */ + nodeoff = fdt_path_offset(fdt, "/psci"); + if (nodeoff >= 0) + goto init_psci_node; + + nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci"); + if (nodeoff >= 0) + goto init_psci_node; + + nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-0.2"); + if (nodeoff >= 0) + goto init_psci_node; + + nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-1.0"); + if (nodeoff >= 0) + goto init_psci_node; + + nodeoff = fdt_path_offset(fdt, "/"); + if (nodeoff < 0) + return nodeoff; + + nodeoff = fdt_add_subnode(fdt, nodeoff, "psci"); + if (nodeoff < 0) + return nodeoff; + +init_psci_node: +#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT + psci_ver = sec_firmware_support_psci_version(); +#endif + switch (psci_ver) { + case 0x00010000: + psci_compt = "arm,psci-1.0"; + break; + case 0x00000002: + psci_compt = "arm,psci-0.2"; + break; + default: + psci_compt = "arm,psci"; + break; + } + + tmp = fdt_setprop_string(fdt, nodeoff, "compatible", psci_compt); + if (tmp) + return tmp; + tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc"); + if (tmp) + return tmp; + +#ifdef CONFIG_ARMV7_PSCI + tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend", + ARM_PSCI_FN_CPU_SUSPEND); + if (tmp) + return tmp; + tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off", ARM_PSCI_FN_CPU_OFF); + if (tmp) + return tmp; + tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on", ARM_PSCI_FN_CPU_ON); + if (tmp) + return tmp; + tmp = fdt_setprop_u32(fdt, nodeoff, "migrate", ARM_PSCI_FN_MIGRATE); + if (tmp) + return tmp; +#endif +#endif + return 0; +} |