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https://github.com/AsahiLinux/u-boot
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5ef5b6d46f
Add i.MX8 thermal driver to support get temperature from SCU. Signed-off-by: Peng Fan <peng.fan@nxp.com>
203 lines
4.7 KiB
C
203 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2019 NXP
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*/
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#include <config.h>
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <thermal.h>
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#include <dm/device-internal.h>
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#include <dm/device.h>
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#include <asm/arch/sci/sci.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct imx_sc_thermal_plat {
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int critical;
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int alert;
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int polling_delay;
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int id;
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bool zone_node;
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};
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static int read_temperature(struct udevice *dev, int *temp)
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{
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s16 celsius;
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s8 tenths;
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int ret;
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sc_rsrc_t *sensor_rsrc = (sc_rsrc_t *)dev_get_driver_data(dev);
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struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
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if (!temp)
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return -EINVAL;
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ret = sc_misc_get_temp(-1, sensor_rsrc[pdata->id], SC_C_TEMP,
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&celsius, &tenths);
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if (ret) {
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printf("Error: get temperature failed! (error = %d)\n", ret);
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return ret;
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}
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*temp = celsius * 1000 + tenths * 100;
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return 0;
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}
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int imx_sc_thermal_get_temp(struct udevice *dev, int *temp)
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{
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struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
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int cpu_temp = 0;
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int ret;
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ret = read_temperature(dev, &cpu_temp);
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if (ret)
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return ret;
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while (cpu_temp >= pdata->alert) {
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printf("CPU Temperature (%dC) has beyond alert (%dC), close to critical (%dC)",
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cpu_temp, pdata->alert, pdata->critical);
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puts(" waiting...\n");
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mdelay(pdata->polling_delay);
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ret = read_temperature(dev, &cpu_temp);
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if (ret)
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return ret;
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}
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*temp = cpu_temp / 1000;
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return 0;
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}
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static const struct dm_thermal_ops imx_sc_thermal_ops = {
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.get_temp = imx_sc_thermal_get_temp,
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};
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static int imx_sc_thermal_probe(struct udevice *dev)
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{
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debug("%s dev name %s\n", __func__, dev->name);
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return 0;
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}
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static int imx_sc_thermal_bind(struct udevice *dev)
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{
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struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
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int reg, ret;
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int offset;
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const char *name;
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const void *prop;
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debug("%s dev name %s\n", __func__, dev->name);
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prop = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "compatible",
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NULL);
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if (!prop)
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return 0;
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pdata->zone_node = 1;
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reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "tsens-num", 0);
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if (reg == 0) {
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printf("%s: no temp sensor number provided!\n", __func__);
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return -EINVAL;
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}
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offset = fdt_subnode_offset(gd->fdt_blob, 0, "thermal-zones");
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fdt_for_each_subnode(offset, gd->fdt_blob, offset) {
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/* Bind the subnode to this driver */
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name = fdt_get_name(gd->fdt_blob, offset, NULL);
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ret = device_bind_with_driver_data(dev, dev->driver, name,
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dev->driver_data,
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offset_to_ofnode(offset),
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NULL);
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if (ret)
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printf("Error binding driver '%s': %d\n",
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dev->driver->name, ret);
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}
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return 0;
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}
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static int imx_sc_thermal_ofdata_to_platdata(struct udevice *dev)
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{
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struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
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struct fdtdec_phandle_args args;
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const char *type;
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int ret;
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int trips_np;
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debug("%s dev name %s\n", __func__, dev->name);
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if (pdata->zone_node)
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return 0;
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ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
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"thermal-sensors",
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"#thermal-sensor-cells",
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0, 0, &args);
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if (ret)
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return ret;
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if (args.node != dev_of_offset(dev->parent))
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return -EFAULT;
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if (args.args_count >= 1)
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pdata->id = args.args[0];
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else
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pdata->id = 0;
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debug("args.args_count %d, id %d\n", args.args_count, pdata->id);
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pdata->polling_delay = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
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"polling-delay", 1000);
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trips_np = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(dev),
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"trips");
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fdt_for_each_subnode(trips_np, gd->fdt_blob, trips_np) {
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type = fdt_getprop(gd->fdt_blob, trips_np, "type", NULL);
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if (type) {
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if (strcmp(type, "critical") == 0) {
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pdata->critical = fdtdec_get_int(gd->fdt_blob,
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trips_np,
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"temperature",
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85);
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} else if (strcmp(type, "passive") == 0) {
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pdata->alert = fdtdec_get_int(gd->fdt_blob,
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trips_np,
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"temperature",
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80);
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}
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}
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}
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debug("id %d polling_delay %d, critical %d, alert %d\n", pdata->id,
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pdata->polling_delay, pdata->critical, pdata->alert);
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return 0;
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}
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static const sc_rsrc_t imx8qxp_sensor_rsrc[] = {
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SC_R_SYSTEM, SC_R_DRC_0, SC_R_PMIC_0,
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SC_R_PMIC_1, SC_R_PMIC_2,
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};
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static const struct udevice_id imx_sc_thermal_ids[] = {
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{ .compatible = "nxp,imx8qxp-sc-tsens", .data =
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(ulong)&imx8qxp_sensor_rsrc, },
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{ }
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};
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U_BOOT_DRIVER(imx_sc_thermal) = {
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.name = "imx_sc_thermal",
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.id = UCLASS_THERMAL,
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.ops = &imx_sc_thermal_ops,
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.of_match = imx_sc_thermal_ids,
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.bind = imx_sc_thermal_bind,
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.probe = imx_sc_thermal_probe,
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.ofdata_to_platdata = imx_sc_thermal_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct imx_sc_thermal_plat),
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.flags = DM_FLAG_PRE_RELOC,
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};
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