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// SPDX-License-Identifier: GPL-2.0
/*
* System control and Management Interface (SCMI) NXP LMM 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_lmm_protocol_cmd {
SCMI_IMX_LMM_ATTRIBUTES = 0x3,
SCMI_IMX_LMM_BOOT = 0x4,
SCMI_IMX_LMM_RESET = 0x5,
SCMI_IMX_LMM_SHUTDOWN = 0x6,
SCMI_IMX_LMM_WAKE = 0x7,
SCMI_IMX_LMM_SUSPEND = 0x8,
SCMI_IMX_LMM_NOTIFY = 0x9,
SCMI_IMX_LMM_RESET_REASON = 0xA,
SCMI_IMX_LMM_POWER_ON = 0xB,
SCMI_IMX_LMM_RESET_VECTOR_SET = 0xC,
};
struct scmi_imx_lmm_priv {
u32 nr_lmm;
};
#define SCMI_IMX_LMM_NR_LM_MASK GENMASK(5, 0)
#define SCMI_IMX_LMM_NR_MAX 16
struct scmi_msg_imx_lmm_protocol_attributes {
__le32 attributes;
};
struct scmi_msg_imx_lmm_attributes_out {
__le32 lmid;
__le32 attributes;
__le32 state;
__le32 errstatus;
u8 name[LMM_MAX_NAME];
};
struct scmi_imx_lmm_reset_vector_set_in {
__le32 lmid;
__le32 cpuid;
__le32 flags; /* reserved for future extension */
__le32 resetvectorlow;
__le32 resetvectorhigh;
};
struct scmi_imx_lmm_shutdown_in {
__le32 lmid;
#define SCMI_IMX_LMM_SHUTDOWN_GRACEFUL BIT(0)
__le32 flags;
};
static int scmi_imx_lmm_validate_lmid(const struct scmi_protocol_handle *ph, u32 lmid)
{
struct scmi_imx_lmm_priv *priv = ph->get_priv(ph);
if (lmid >= priv->nr_lmm)
return -EINVAL;
return 0;
}
static int scmi_imx_lmm_attributes(const struct scmi_protocol_handle *ph,
u32 lmid, struct scmi_imx_lmm_info *info)
{
struct scmi_msg_imx_lmm_attributes_out *out;
struct scmi_xfer *t;
int ret;
ret = ph->xops->xfer_get_init(ph, SCMI_IMX_LMM_ATTRIBUTES, sizeof(u32), 0, &t);
if (ret)
return ret;
put_unaligned_le32(lmid, t->tx.buf);
ret = ph->xops->do_xfer(ph, t);
if (!ret) {
out = t->rx.buf;
info->lmid = le32_to_cpu(out->lmid);
info->state = le32_to_cpu(out->state);
info->errstatus = le32_to_cpu(out->errstatus);
strscpy(info->name, out->name);
dev_dbg(ph->dev, "i.MX LMM: Logical Machine(%d), name: %s\n",
info->lmid, info->name);
} else {
dev_err(ph->dev, "i.MX LMM: Failed to get info of Logical Machine(%u)\n", lmid);
}
ph->xops->xfer_put(ph, t);
return ret;
}
static int
scmi_imx_lmm_power_boot(const struct scmi_protocol_handle *ph, u32 lmid, bool boot)
{
struct scmi_xfer *t;
u8 msg_id;
int ret;
ret = scmi_imx_lmm_validate_lmid(ph, lmid);
if (ret)
return ret;
if (boot)
msg_id = SCMI_IMX_LMM_BOOT;
else
msg_id = SCMI_IMX_LMM_POWER_ON;
ret = ph->xops->xfer_get_init(ph, msg_id, sizeof(u32), 0, &t);
if (ret)
return ret;
put_unaligned_le32(lmid, t->tx.buf);
ret = ph->xops->do_xfer(ph, t);
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_imx_lmm_reset_vector_set(const struct scmi_protocol_handle *ph,
u32 lmid, u32 cpuid, u32 flags, u64 vector)
{
struct scmi_imx_lmm_reset_vector_set_in *in;
struct scmi_xfer *t;
int ret;
ret = ph->xops->xfer_get_init(ph, SCMI_IMX_LMM_RESET_VECTOR_SET, sizeof(*in),
0, &t);
if (ret)
return ret;
in = t->tx.buf;
in->lmid = cpu_to_le32(lmid);
in->cpuid = cpu_to_le32(cpuid);
in->flags = cpu_to_le32(0);
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_lmm_shutdown(const struct scmi_protocol_handle *ph, u32 lmid,
u32 flags)
{
struct scmi_imx_lmm_shutdown_in *in;
struct scmi_xfer *t;
int ret;
ret = scmi_imx_lmm_validate_lmid(ph, lmid);
if (ret)
return ret;
ret = ph->xops->xfer_get_init(ph, SCMI_IMX_LMM_SHUTDOWN, sizeof(*in),
0, &t);
if (ret)
return ret;
in = t->tx.buf;
in->lmid = cpu_to_le32(lmid);
if (flags & SCMI_IMX_LMM_SHUTDOWN_GRACEFUL)
in->flags = cpu_to_le32(SCMI_IMX_LMM_SHUTDOWN_GRACEFUL);
else
in->flags = cpu_to_le32(0);
ret = ph->xops->do_xfer(ph, t);
ph->xops->xfer_put(ph, t);
return ret;
}
static const struct scmi_imx_lmm_proto_ops scmi_imx_lmm_proto_ops = {
.lmm_power_boot = scmi_imx_lmm_power_boot,
.lmm_info = scmi_imx_lmm_attributes,
.lmm_reset_vector_set = scmi_imx_lmm_reset_vector_set,
.lmm_shutdown = scmi_imx_lmm_shutdown,
};
static int scmi_imx_lmm_protocol_attributes_get(const struct scmi_protocol_handle *ph,
struct scmi_imx_lmm_priv *priv)
{
struct scmi_msg_imx_lmm_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) {
priv->nr_lmm = le32_get_bits(attr->attributes, SCMI_IMX_LMM_NR_LM_MASK);
if (priv->nr_lmm > SCMI_IMX_LMM_NR_MAX) {
dev_err(ph->dev, "i.MX LMM: %d:Exceed max supported Logical Machines\n",
priv->nr_lmm);
ret = -EINVAL;
} else {
dev_info(ph->dev, "i.MX LMM: %d Logical Machines\n", priv->nr_lmm);
}
}
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_imx_lmm_protocol_init(const struct scmi_protocol_handle *ph)
{
struct scmi_imx_lmm_priv *info;
u32 version;
int ret;
ret = ph->xops->version_get(ph, &version);
if (ret)
return ret;
dev_info(ph->dev, "NXP SM LMM 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_lmm_protocol_attributes_get(ph, info);
if (ret)
return ret;
return ph->set_priv(ph, info, version);
}
static const struct scmi_protocol scmi_imx_lmm = {
.id = SCMI_PROTOCOL_IMX_LMM,
.owner = THIS_MODULE,
.instance_init = &scmi_imx_lmm_protocol_init,
.ops = &scmi_imx_lmm_proto_ops,
.supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
.vendor_id = SCMI_IMX_VENDOR,
.sub_vendor_id = SCMI_IMX_SUBVENDOR,
};
module_scmi_protocol(scmi_imx_lmm);
MODULE_ALIAS("scmi-protocol-" __stringify(SCMI_PROTOCOL_IMX_LMM) "-" SCMI_IMX_VENDOR);
MODULE_DESCRIPTION("i.MX SCMI LMM driver");
MODULE_LICENSE("GPL");
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