diff options
Diffstat (limited to 'drivers/thermal/scmi_thermal.c')
| -rw-r--r-- | drivers/thermal/scmi_thermal.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/thermal/scmi_thermal.c b/drivers/thermal/scmi_thermal.c new file mode 100644 index 0000000000..bccfd28c2f --- /dev/null +++ b/drivers/thermal/scmi_thermal.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2022 NXP + */ + +#include <common.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <thermal.h> +#include <scmi_agent.h> +#include <scmi_protocols.h> +#include <asm/types.h> +#include <dm/device-internal.h> +#include <dm/device.h> + +struct scmi_thermal_priv { + s16 num_sensors; + s16 thermal_id; + struct scmi_sensor_descrition_get_p2a *desc_buf; + size_t desc_buf_size; +}; + +static int scmi_thermal_get_temp(struct udevice *dev, int *temp) +{ + struct scmi_thermal_priv *priv = dev_get_priv(dev); + struct scmi_sensor_reading_get_a2p in = { priv->thermal_id }; + struct scmi_sensor_reading_get_p2a out = { 0 }; + struct scmi_msg msg = { + .protocol_id = SCMI_PROTOCOL_ID_SENSOR, + .message_id = SCMI_SENSOR_READING_GET, + .in_msg = (u8 *)&in, + .in_msg_sz = sizeof(in), + .out_msg = (u8 *)&out, + .out_msg_sz = sizeof(out), + }; + int ret; + + ret = devm_scmi_process_msg(dev->parent, &msg); + if (ret) + return ret; + + ret = scmi_to_linux_errno(out.status); + if (ret < 0) + return ret; + + *temp = out.val.value_low; + + return ret; +} + +static int scmi_sensor_attributes_get(struct udevice *dev) +{ + struct scmi_protocol_attributes_p2a_sensor out = { 0 }; + struct scmi_msg msg = { + .protocol_id = SCMI_PROTOCOL_ID_SENSOR, + .message_id = SCMI_PROTOCOL_ATTRIBUTES, + .in_msg = NULL, + .in_msg_sz = 0, + .out_msg = (u8 *)&out, + .out_msg_sz = sizeof(out), + }; + int ret; + struct scmi_thermal_priv *priv = dev_get_priv(dev); + + ret = devm_scmi_process_msg(dev->parent, &msg); + if (ret) + return ret; + + ret = scmi_to_linux_errno(out.status); + if (ret < 0) + return ret; + + priv->num_sensors = out.num_sensors; + + dev_dbg(dev,"num_sensors %d\n", priv->num_sensors); + + return 0; +} + +static int scmi_sensor_description_get(struct udevice *dev, u32 start_ind, + struct scmi_sensor_descrition_get_p2a *desc_buf, size_t desc_buf_size) +{ + struct scmi_sensor_description_get_a2p in = { start_ind }; + struct scmi_msg msg = { + .protocol_id = SCMI_PROTOCOL_ID_SENSOR, + .message_id = SCMI_SENSOR_DESCRIPTION_GET, + .in_msg = (u8 *)&in, + .in_msg_sz = sizeof(in), + .out_msg = (u8 *)desc_buf, + .out_msg_sz = desc_buf_size, + }; + int ret; + + ret = devm_scmi_process_msg(dev->parent, &msg); + if (ret) + return ret; + + ret = scmi_to_linux_errno(desc_buf->status); + if (ret < 0) + return ret; + + return ret; +} + +static const struct dm_thermal_ops scmi_thermal_ops = { + .get_temp = scmi_thermal_get_temp, +}; + +static int scmi_thermal_probe(struct udevice *dev) +{ + int ret; + u16 num_returned, num_remaining, cnt; + u32 index = 0; + bool find = false; + struct scmi_sensor_desc *desc; + struct scmi_thermal_priv *priv = dev_get_priv(dev); + + ret = scmi_sensor_attributes_get(dev); + if (ret){ + dev_err(dev, "scmi_sensor_attributes_get failure %d\n", ret); + return ret; + } + + priv->desc_buf_size = sizeof(struct scmi_sensor_descrition_get_p2a) + + (priv->num_sensors - 1) * sizeof(struct scmi_sensor_desc); + priv->desc_buf = (struct scmi_sensor_descrition_get_p2a *)calloc(1, priv->desc_buf_size); + if (!priv->desc_buf) { + dev_err(dev, "allocate desc_buffer failure\n"); + return -ENOMEM; + } + + do { + ret = scmi_sensor_description_get(dev, index, priv->desc_buf, priv->desc_buf_size); + if (ret){ + dev_err(dev, "scmi_sensor_description_get failure %d\n", ret); + return ret; + } + + num_returned = priv->desc_buf->num_sensor_flags & 0xffff; + num_remaining = (priv->desc_buf->num_sensor_flags >> 16) & 0xffff; + + if (index + num_returned > priv->num_sensors) { + dev_err(dev, "Num of sensors can't exceed %d", + priv->num_sensors); + return -EINVAL; + } + + for (cnt = 0; cnt < num_returned; cnt++) { + desc = &priv->desc_buf->desc[cnt]; + if ((desc->attr_high & 0xff) == 0x2) { + priv->thermal_id = desc->id; /* Only get one thermal sensor */ + dev_dbg(dev, "thermal id %u\n", priv->thermal_id); + find = true; + break; + } + } + + index += num_returned; + } while (num_returned && num_remaining && !find); + + if (!find) { + dev_err(dev, "Can't find thermal sensor device\n"); + return -ENODEV; + } + + return 0; +} + +U_BOOT_DRIVER(scmi_thermal) = { + .name = "scmi_thermal", + .id = UCLASS_THERMAL, + .ops = &scmi_thermal_ops, + .probe = scmi_thermal_probe, + .flags = DM_FLAG_PRE_RELOC, + .priv_auto = sizeof(struct scmi_thermal_priv), +}; |