[PATCH 4/5] firmware: imx: Add i.MX95 SCMI LMM driver

Peng Fan (OSS)
2025-01-21T15:09:11Z

From: Peng Fan <peng.fan@nxp.com>

The i.MX95 System manager exports SCMI LMM protocol for linux to manage
Logical Machines. The driver is to use the LMM Protocol interface to
boot, shutdown a LM.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
drivers/firmware/imx/Kconfig | 11 +++++
drivers/firmware/imx/Makefile | 1 +
drivers/firmware/imx/sm-lmm.c | 89 +++++++++++++++++++++++++++++++++++++++++
include/linux/firmware/imx/sm.h | 27 +++++++++++++
4 files changed, 128 insertions(+)

diff --git a/drivers/firmware/imx/Kconfig b/drivers/firmware/imx/Kconfig
index 907cd149c40a8b5f1b14c53e1c315ff4a28f32ac..c3e344d6ecc645df1f0e3ee8078934c47f347fd7 100644
--- a/drivers/firmware/imx/Kconfig
+++ b/drivers/firmware/imx/Kconfig
@@ -23,6 +23,17 @@ config IMX_SCU
This driver manages the IPC interface between host CPU and the
SCU firmware running on M4.

+config IMX_SCMI_LMM_DRV
+ tristate "IMX SCMI LMM Protocol driver"
+ depends on IMX_SCMI_LMM_EXT || COMPILE_TEST
+ default y if ARCH_MXC
+ help
+ The System Controller Management Interface firmware (SCMI FW) is
+ a low-level system function which runs on a dedicated Cortex-M
+ core that could provide Logical Machine management features.
+
+ This driver can also be built as a module.
+
config IMX_SCMI_MISC_DRV
tristate "IMX SCMI MISC Protocol driver"
default y if ARCH_MXC
diff --git a/drivers/firmware/imx/Makefile b/drivers/firmware/imx/Makefile
index 8d046c341be878bb6dd1e6277992ff66ae90e292..7762855d2a771169d4f1867d27e0d51be7c9ad03 100644
--- a/drivers/firmware/imx/Makefile
+++ b/drivers/firmware/imx/Makefile
@@ -2,3 +2,4 @@
obj-$(CONFIG_IMX_DSP) += imx-dsp.o
obj-$(CONFIG_IMX_SCU) += imx-scu.o misc.o imx-scu-irq.o rm.o imx-scu-soc.o
obj-${CONFIG_IMX_SCMI_MISC_DRV} += sm-misc.o
+obj-${CONFIG_IMX_SCMI_LMM_DRV} += sm-lmm.o
diff --git a/drivers/firmware/imx/sm-lmm.c b/drivers/firmware/imx/sm-lmm.c
new file mode 100644
index 0000000000000000000000000000000000000000..91a504e7f0d99089d3c2250a7918fb2fe99e991d
--- /dev/null
+++ b/drivers/firmware/imx/sm-lmm.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2025 NXP
+ */
+
+#include <linux/firmware/imx/sm.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>
+
+static const struct scmi_imx_lmm_proto_ops *imx_lmm_ops;
+static struct scmi_protocol_handle *ph;
+
+int scmi_imx_lmm_boot(u32 lmid)
+{
+ if (!ph)
+ return -EPROBE_DEFER;
+
+ return imx_lmm_ops->lmm_boot(ph, lmid);
+};
+EXPORT_SYMBOL(scmi_imx_lmm_boot);
+
+int scmi_imx_lmm_info(u32 lmid, struct scmi_imx_lmm_info *info)
+{
+ if (!ph)
+ return -EPROBE_DEFER;
+
+ if (!info)
+ return -EINVAL;
+
+ return imx_lmm_ops->lmm_info(ph, lmid, info);
+};
+EXPORT_SYMBOL(scmi_imx_lmm_info);
+
+int scmi_imx_lmm_power_on(u32 lmid)
+{
+ if (!ph)
+ return -EPROBE_DEFER;
+
+ return imx_lmm_ops->lmm_power_on(ph, lmid);
+};
+EXPORT_SYMBOL(scmi_imx_lmm_power_on);
+
+int scmi_imx_lmm_shutdown(u32 lmid, u32 flags)
+{
+ if (!ph)
+ return -EPROBE_DEFER;
+
+ return imx_lmm_ops->lmm_shutdown(ph, lmid, flags);
+};
+EXPORT_SYMBOL(scmi_imx_lmm_shutdown);
+
+static int scmi_imx_lmm_probe(struct scmi_device *sdev)
+{
+ const struct scmi_handle *handle = sdev->handle;
+
+ if (!handle)
+ return -ENODEV;
+
+ if (imx_lmm_ops) {
+ dev_err(&sdev->dev, "lmm already initialized\n");
+ return -EEXIST;
+ }
+
+ imx_lmm_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_IMX_LMM, &ph);
+ if (IS_ERR(imx_lmm_ops))
+ return PTR_ERR(imx_lmm_ops);
+
+ return 0;
+}
+
+static const struct scmi_device_id scmi_id_table[] = {
+ { SCMI_PROTOCOL_IMX_LMM, "imx-lmm" },
+ { },
+};
+MODULE_DEVICE_TABLE(scmi, scmi_id_table);
+
+static struct scmi_driver scmi_imx_lmm_driver = {
+ .name = "scmi-imx-lmm",
+ .probe = scmi_imx_lmm_probe,
+ .id_table = scmi_id_table,
+};
+module_scmi_driver(scmi_imx_lmm_driver);
+
+MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
+MODULE_DESCRIPTION("IMX SM LMM driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/firmware/imx/sm.h b/include/linux/firmware/imx/sm.h
index 9b85a3f028d1b0a5287b453eb3ad8412a363fe6c..1e58ffaa81acd757d9e6a992a2f2df663681c08a 100644
--- a/include/linux/firmware/imx/sm.h
+++ b/include/linux/firmware/imx/sm.h
@@ -8,6 +8,7 @@

#include <linux/bitfield.h>
#include <linux/errno.h>
+#include <linux/scmi_imx_protocol.h>
#include <linux/types.h>

#define SCMI_IMX_CTRL_PDM_CLK_SEL 0 /* AON PDM clock sel */
@@ -20,4 +21,30 @@
int scmi_imx_misc_ctrl_get(u32 id, u32 *num, u32 *val);
int scmi_imx_misc_ctrl_set(u32 id, u32 val);

+#if IS_ENABLED(CONFIG_IMX_SCMI_LMM_DRV) || IS_ENABLED(CONFIG_COMPILE_TEST)
+int scmi_imx_lmm_boot(u32 lmid);
+int scmi_imx_lmm_info(u32 lmid, struct scmi_imx_lmm_info *info);
+int scmi_imx_lmm_power_on(u32 lmid);
+int scmi_imx_lmm_shutdown(u32 lmid, u32 flags);
+#else
+static inline int scmi_imx_lmm_boot(u32 lmid)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline int scmi_imx_lmm_info(u32 lmid, struct scmi_imx_lmm_info *info)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline int scmi_imx_lmm_power_on(u32 lmid)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline int scmi_imx_lmm_shutdown(u32 lmid, u32 flags)
+{
+ return -EOPNOTSUPP;
+}
+#endif
#endif

--
2.37.1