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// SPDX-License-Identifier: GPL-2.0
/*
* System control and Management Interface (SCMI) NXP CPU Protocol
*
* Copyright 2025 NXP
*/
#include <linux/bits.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/scmi_protocol.h>
#include <linux/scmi_imx_protocol.h>
#include "../../protocols.h"
#include "../../notify.h"
#define SCMI_PROTOCOL_SUPPORTED_VERSION 0x10000
enum scmi_imx_cpu_protocol_cmd {
SCMI_IMX_CPU_ATTRIBUTES = 0x3,
SCMI_IMX_CPU_START = 0x4,
SCMI_IMX_CPU_STOP = 0x5,
SCMI_IMX_CPU_RESET_VECTOR_SET = 0x6,
SCMI_IMX_CPU_INFO_GET = 0xC,
};
struct scmi_imx_cpu_info {
u32 nr_cpu;
};
#define SCMI_IMX_CPU_NR_CPU_MASK GENMASK(15, 0)
struct scmi_msg_imx_cpu_protocol_attributes {
__le32 attributes;
};
struct scmi_msg_imx_cpu_attributes_out {
__le32 attributes;
#define CPU_MAX_NAME 16
u8 name[CPU_MAX_NAME];
};
struct scmi_imx_cpu_reset_vector_set_in {
__le32 cpuid;
#define CPU_VEC_FLAGS_RESUME BIT(31)
#define CPU_VEC_FLAGS_START BIT(30)
#define CPU_VEC_FLAGS_BOOT BIT(29)
__le32 flags;
__le32 resetvectorlow;
__le32 resetvectorhigh;
};
struct scmi_imx_cpu_info_get_out {
#define CPU_RUN_MODE_START 0
#define CPU_RUN_MODE_HOLD 1
#define CPU_RUN_MODE_STOP 2
#define CPU_RUN_MODE_SLEEP 3
__le32 runmode;
__le32 sleepmode;
__le32 resetvectorlow;
__le32 resetvectorhigh;
};
static int scmi_imx_cpu_validate_cpuid(const struct scmi_protocol_handle *ph,
u32 cpuid)
{
struct scmi_imx_cpu_info *info = ph->get_priv(ph);
if (cpuid >= info->nr_cpu)
return -EINVAL;
return 0;
}
static int scmi_imx_cpu_start(const struct scmi_protocol_handle *ph,
u32 cpuid, bool start)
{
struct scmi_xfer *t;
u8 msg_id;
int ret;
ret = scmi_imx_cpu_validate_cpuid(ph, cpuid);
if (ret)
return ret;
if (start)
msg_id = SCMI_IMX_CPU_START;
else
msg_id = SCMI_IMX_CPU_STOP;
ret = ph->xops->xfer_get_init(ph, msg_id, sizeof(u32), 0, &t);
if (ret)
return ret;
put_unaligned_le32(cpuid, t->tx.buf);
ret = ph->xops->do_xfer(ph, t);
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_imx_cpu_reset_vector_set(const struct scmi_protocol_handle *ph,
u32 cpuid, u64 vector, bool start,
bool boot, bool resume)
{
struct scmi_imx_cpu_reset_vector_set_in *in;
struct scmi_xfer *t;
int ret;
ret = scmi_imx_cpu_validate_cpuid(ph, cpuid);
if (ret)
return ret;
ret = ph->xops->xfer_get_init(ph, SCMI_IMX_CPU_RESET_VECTOR_SET, sizeof(*in),
0, &t);
if (ret)
return ret;
in = t->tx.buf;
in->cpuid = cpu_to_le32(cpuid);
in->flags = cpu_to_le32(0);
if (start)
in->flags |= le32_encode_bits(1, CPU_VEC_FLAGS_START);
if (boot)
in->flags |= le32_encode_bits(1, CPU_VEC_FLAGS_BOOT);
if (resume)
in->flags |= le32_encode_bits(1, CPU_VEC_FLAGS_RESUME);
in->resetvectorlow = cpu_to_le32(lower_32_bits(vector));
in->resetvectorhigh = cpu_to_le32(upper_32_bits(vector));
ret = ph->xops->do_xfer(ph, t);
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_imx_cpu_started(const struct scmi_protocol_handle *ph, u32 cpuid,
bool *started)
{
struct scmi_imx_cpu_info_get_out *out;
struct scmi_xfer *t;
u32 mode;
int ret;
if (!started)
return -EINVAL;
*started = false;
ret = scmi_imx_cpu_validate_cpuid(ph, cpuid);
if (ret)
return ret;
ret = ph->xops->xfer_get_init(ph, SCMI_IMX_CPU_INFO_GET, sizeof(u32),
0, &t);
if (ret)
return ret;
put_unaligned_le32(cpuid, t->tx.buf);
ret = ph->xops->do_xfer(ph, t);
if (!ret) {
out = t->rx.buf;
mode = le32_to_cpu(out->runmode);
if (mode == CPU_RUN_MODE_START || mode == CPU_RUN_MODE_SLEEP)
*started = true;
}
ph->xops->xfer_put(ph, t);
return ret;
}
static const struct scmi_imx_cpu_proto_ops scmi_imx_cpu_proto_ops = {
.cpu_reset_vector_set = scmi_imx_cpu_reset_vector_set,
.cpu_start = scmi_imx_cpu_start,
.cpu_started = scmi_imx_cpu_started,
};
static int scmi_imx_cpu_protocol_attributes_get(const struct scmi_protocol_handle *ph,
struct scmi_imx_cpu_info *info)
{
struct scmi_msg_imx_cpu_protocol_attributes *attr;
struct scmi_xfer *t;
int ret;
ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES, 0,
sizeof(*attr), &t);
if (ret)
return ret;
attr = t->rx.buf;
ret = ph->xops->do_xfer(ph, t);
if (!ret) {
info->nr_cpu = le32_get_bits(attr->attributes, SCMI_IMX_CPU_NR_CPU_MASK);
dev_info(ph->dev, "i.MX SM CPU: %d cpus\n",
info->nr_cpu);
}
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_imx_cpu_attributes_get(const struct scmi_protocol_handle *ph,
u32 cpuid)
{
struct scmi_msg_imx_cpu_attributes_out *out;
char name[SCMI_SHORT_NAME_MAX_SIZE] = {'\0'};
struct scmi_xfer *t;
int ret;
ret = ph->xops->xfer_get_init(ph, SCMI_IMX_CPU_ATTRIBUTES, sizeof(u32), 0, &t);
if (ret)
return ret;
put_unaligned_le32(cpuid, t->tx.buf);
ret = ph->xops->do_xfer(ph, t);
if (!ret) {
out = t->rx.buf;
strscpy(name, out->name, SCMI_SHORT_NAME_MAX_SIZE);
dev_info(ph->dev, "i.MX CPU: name: %s\n", name);
} else {
dev_err(ph->dev, "i.MX cpu: Failed to get info of cpu(%u)\n", cpuid);
}
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_imx_cpu_protocol_init(const struct scmi_protocol_handle *ph)
{
struct scmi_imx_cpu_info *info;
u32 version;
int ret, i;
ret = ph->xops->version_get(ph, &version);
if (ret)
return ret;
dev_info(ph->dev, "NXP SM CPU Protocol Version %d.%d\n",
PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
info = devm_kzalloc(ph->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
ret = scmi_imx_cpu_protocol_attributes_get(ph, info);
if (ret)
return ret;
for (i = 0; i < info->nr_cpu; i++) {
ret = scmi_imx_cpu_attributes_get(ph, i);
if (ret)
return ret;
}
return ph->set_priv(ph, info, version);
}
static const struct scmi_protocol scmi_imx_cpu = {
.id = SCMI_PROTOCOL_IMX_CPU,
.owner = THIS_MODULE,
.instance_init = &scmi_imx_cpu_protocol_init,
.ops = &scmi_imx_cpu_proto_ops,
.supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
.vendor_id = SCMI_IMX_VENDOR,
.sub_vendor_id = SCMI_IMX_SUBVENDOR,
};
module_scmi_protocol(scmi_imx_cpu);
MODULE_ALIAS("scmi-protocol-" __stringify(SCMI_PROTOCOL_IMX_CPU) "-" SCMI_IMX_VENDOR);
MODULE_DESCRIPTION("i.MX SCMI CPU driver");
MODULE_LICENSE("GPL");
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