diff options
Diffstat (limited to 'drivers/thermal/qoriq_thermal.c')
| -rw-r--r-- | drivers/thermal/qoriq_thermal.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c new file mode 100644 index 000000000..450ed66ed --- /dev/null +++ b/drivers/thermal/qoriq_thermal.c @@ -0,0 +1,314 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright 2016 Freescale Semiconductor, Inc. + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/thermal.h> + +#include "thermal_core.h" + +#define SITES_MAX 16 + +/* + * QorIQ TMU Registers + */ +struct qoriq_tmu_site_regs { + u32 tritsr; /* Immediate Temperature Site Register */ + u32 tratsr; /* Average Temperature Site Register */ + u8 res0[0x8]; +}; + +struct qoriq_tmu_regs { + u32 tmr; /* Mode Register */ +#define TMR_DISABLE 0x0 +#define TMR_ME 0x80000000 +#define TMR_ALPF 0x0c000000 + u32 tsr; /* Status Register */ + u32 tmtmir; /* Temperature measurement interval Register */ +#define TMTMIR_DEFAULT 0x0000000f + u8 res0[0x14]; + u32 tier; /* Interrupt Enable Register */ +#define TIER_DISABLE 0x0 + u32 tidr; /* Interrupt Detect Register */ + u32 tiscr; /* Interrupt Site Capture Register */ + u32 ticscr; /* Interrupt Critical Site Capture Register */ + u8 res1[0x10]; + u32 tmhtcrh; /* High Temperature Capture Register */ + u32 tmhtcrl; /* Low Temperature Capture Register */ + u8 res2[0x8]; + u32 tmhtitr; /* High Temperature Immediate Threshold */ + u32 tmhtatr; /* High Temperature Average Threshold */ + u32 tmhtactr; /* High Temperature Average Crit Threshold */ + u8 res3[0x24]; + u32 ttcfgr; /* Temperature Configuration Register */ + u32 tscfgr; /* Sensor Configuration Register */ + u8 res4[0x78]; + struct qoriq_tmu_site_regs site[SITES_MAX]; + u8 res5[0x9f8]; + u32 ipbrr0; /* IP Block Revision Register 0 */ + u32 ipbrr1; /* IP Block Revision Register 1 */ + u8 res6[0x310]; + u32 ttr0cr; /* Temperature Range 0 Control Register */ + u32 ttr1cr; /* Temperature Range 1 Control Register */ + u32 ttr2cr; /* Temperature Range 2 Control Register */ + u32 ttr3cr; /* Temperature Range 3 Control Register */ +}; + +/* + * Thermal zone data + */ +struct qoriq_tmu_data { + struct thermal_zone_device *tz; + struct qoriq_tmu_regs __iomem *regs; + int sensor_id; + bool little_endian; +}; + +static void tmu_write(struct qoriq_tmu_data *p, u32 val, void __iomem *addr) +{ + if (p->little_endian) + iowrite32(val, addr); + else + iowrite32be(val, addr); +} + +static u32 tmu_read(struct qoriq_tmu_data *p, void __iomem *addr) +{ + if (p->little_endian) + return ioread32(addr); + else + return ioread32be(addr); +} + +static int tmu_get_temp(void *p, int *temp) +{ + u32 val; + struct qoriq_tmu_data *data = p; + + val = tmu_read(data, &data->regs->site[data->sensor_id].tritsr); + *temp = (val & 0xff) * 1000; + + return 0; +} + +static int qoriq_tmu_get_sensor_id(void) +{ + int ret, id; + struct of_phandle_args sensor_specs; + struct device_node *np, *sensor_np; + + np = of_find_node_by_name(NULL, "thermal-zones"); + if (!np) + return -ENODEV; + + sensor_np = of_get_next_child(np, NULL); + ret = of_parse_phandle_with_args(sensor_np, "thermal-sensors", + "#thermal-sensor-cells", + 0, &sensor_specs); + if (ret) { + of_node_put(np); + of_node_put(sensor_np); + return ret; + } + + if (sensor_specs.args_count >= 1) { + id = sensor_specs.args[0]; + WARN(sensor_specs.args_count > 1, + "%s: too many cells in sensor specifier %d\n", + sensor_specs.np->name, sensor_specs.args_count); + } else { + id = 0; + } + + of_node_put(np); + of_node_put(sensor_np); + + return id; +} + +static int qoriq_tmu_calibration(struct platform_device *pdev) +{ + int i, val, len; + u32 range[4]; + const u32 *calibration; + struct device_node *np = pdev->dev.of_node; + struct qoriq_tmu_data *data = platform_get_drvdata(pdev); + + if (of_property_read_u32_array(np, "fsl,tmu-range", range, 4)) { + dev_err(&pdev->dev, "missing calibration range.\n"); + return -ENODEV; + } + + /* Init temperature range registers */ + tmu_write(data, range[0], &data->regs->ttr0cr); + tmu_write(data, range[1], &data->regs->ttr1cr); + tmu_write(data, range[2], &data->regs->ttr2cr); + tmu_write(data, range[3], &data->regs->ttr3cr); + + calibration = of_get_property(np, "fsl,tmu-calibration", &len); + if (calibration == NULL || len % 8) { + dev_err(&pdev->dev, "invalid calibration data.\n"); + return -ENODEV; + } + + for (i = 0; i < len; i += 8, calibration += 2) { + val = of_read_number(calibration, 1); + tmu_write(data, val, &data->regs->ttcfgr); + val = of_read_number(calibration + 1, 1); + tmu_write(data, val, &data->regs->tscfgr); + } + + return 0; +} + +static void qoriq_tmu_init_device(struct qoriq_tmu_data *data) +{ + /* Disable interrupt, using polling instead */ + tmu_write(data, TIER_DISABLE, &data->regs->tier); + + /* Set update_interval */ + tmu_write(data, TMTMIR_DEFAULT, &data->regs->tmtmir); + + /* Disable monitoring */ + tmu_write(data, TMR_DISABLE, &data->regs->tmr); +} + +static const struct thermal_zone_of_device_ops tmu_tz_ops = { + .get_temp = tmu_get_temp, +}; + +static int qoriq_tmu_probe(struct platform_device *pdev) +{ + int ret; + struct qoriq_tmu_data *data; + struct device_node *np = pdev->dev.of_node; + u32 site; + + if (!np) { + dev_err(&pdev->dev, "Device OF-Node is NULL"); + return -ENODEV; + } + + data = devm_kzalloc(&pdev->dev, sizeof(struct qoriq_tmu_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + platform_set_drvdata(pdev, data); + + data->little_endian = of_property_read_bool(np, "little-endian"); + + data->sensor_id = qoriq_tmu_get_sensor_id(); + if (data->sensor_id < 0) { + dev_err(&pdev->dev, "Failed to get sensor id\n"); + ret = -ENODEV; + goto err_iomap; + } + + data->regs = of_iomap(np, 0); + if (!data->regs) { + dev_err(&pdev->dev, "Failed to get memory region\n"); + ret = -ENODEV; + goto err_iomap; + } + + qoriq_tmu_init_device(data); /* TMU initialization */ + + ret = qoriq_tmu_calibration(pdev); /* TMU calibration */ + if (ret < 0) + goto err_tmu; + + data->tz = devm_thermal_zone_of_sensor_register(&pdev->dev, + data->sensor_id, + data, &tmu_tz_ops); + if (IS_ERR(data->tz)) { + ret = PTR_ERR(data->tz); + dev_err(&pdev->dev, + "Failed to register thermal zone device %d\n", ret); + goto err_tmu; + } + + /* Enable monitoring */ + site = 0x1 << (15 - data->sensor_id); + tmu_write(data, site | TMR_ME | TMR_ALPF, &data->regs->tmr); + + return 0; + +err_tmu: + iounmap(data->regs); + +err_iomap: + platform_set_drvdata(pdev, NULL); + + return ret; +} + +static int qoriq_tmu_remove(struct platform_device *pdev) +{ + struct qoriq_tmu_data *data = platform_get_drvdata(pdev); + + /* Disable monitoring */ + tmu_write(data, TMR_DISABLE, &data->regs->tmr); + + iounmap(data->regs); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int qoriq_tmu_suspend(struct device *dev) +{ + u32 tmr; + struct qoriq_tmu_data *data = dev_get_drvdata(dev); + + /* Disable monitoring */ + tmr = tmu_read(data, &data->regs->tmr); + tmr &= ~TMR_ME; + tmu_write(data, tmr, &data->regs->tmr); + + return 0; +} + +static int qoriq_tmu_resume(struct device *dev) +{ + u32 tmr; + struct qoriq_tmu_data *data = dev_get_drvdata(dev); + + /* Enable monitoring */ + tmr = tmu_read(data, &data->regs->tmr); + tmr |= TMR_ME; + tmu_write(data, tmr, &data->regs->tmr); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops, + qoriq_tmu_suspend, qoriq_tmu_resume); + +static const struct of_device_id qoriq_tmu_match[] = { + { .compatible = "fsl,qoriq-tmu", }, + {}, +}; +MODULE_DEVICE_TABLE(of, qoriq_tmu_match); + +static struct platform_driver qoriq_tmu = { + .driver = { + .name = "qoriq_thermal", + .pm = &qoriq_tmu_pm_ops, + .of_match_table = qoriq_tmu_match, + }, + .probe = qoriq_tmu_probe, + .remove = qoriq_tmu_remove, +}; +module_platform_driver(qoriq_tmu); + +MODULE_AUTHOR("Jia Hongtao <hongtao.jia@nxp.com>"); +MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver"); +MODULE_LICENSE("GPL v2"); |