diff options
Diffstat (limited to 'drivers/thermal/qoriq_thermal.c')
| -rw-r--r-- | drivers/thermal/qoriq_thermal.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c new file mode 100644 index 0000000000..ccc2eea7f9 --- /dev/null +++ b/drivers/thermal/qoriq_thermal.c @@ -0,0 +1,395 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright 2016 Freescale Semiconductor, Inc. + +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/sizes.h> +#include <linux/thermal.h> +#include <linux/units.h> + +#include "thermal_hwmon.h" + +#define SITES_MAX 16 +#define TMR_DISABLE 0x0 +#define TMR_ME 0x80000000 +#define TMR_ALPF 0x0c000000 +#define TMR_ALPF_V2 0x03000000 +#define TMTMIR_DEFAULT 0x0000000f +#define TIER_DISABLE 0x0 +#define TEUMR0_V2 0x51009c00 +#define TMSARA_V2 0xe +#define TMU_VER1 0x1 +#define TMU_VER2 0x2 + +#define REGS_TMR 0x000 /* Mode Register */ +#define TMR_DISABLE 0x0 +#define TMR_ME 0x80000000 +#define TMR_ALPF 0x0c000000 + +#define REGS_TMTMIR 0x008 /* Temperature measurement interval Register */ +#define TMTMIR_DEFAULT 0x0000000f + +#define REGS_V2_TMSR 0x008 /* monitor site register */ + +#define REGS_V2_TMTMIR 0x00c /* Temperature measurement interval Register */ + +#define REGS_TIER 0x020 /* Interrupt Enable Register */ +#define TIER_DISABLE 0x0 + + +#define REGS_TTCFGR 0x080 /* Temperature Configuration Register */ +#define REGS_TSCFGR 0x084 /* Sensor Configuration Register */ + +#define REGS_TRITSR(n) (0x100 + 16 * (n)) /* Immediate Temperature + * Site Register + */ +#define TRITSR_V BIT(31) +#define TRITSR_TP5 BIT(9) +#define REGS_V2_TMSAR(n) (0x304 + 16 * (n)) /* TMU monitoring + * site adjustment register + */ +#define REGS_TTRnCR(n) (0xf10 + 4 * (n)) /* Temperature Range n + * Control Register + */ +#define REGS_IPBRR(n) (0xbf8 + 4 * (n)) /* IP Block Revision + * Register n + */ +#define REGS_V2_TEUMR(n) (0xf00 + 4 * (n)) + +/* + * Thermal zone data + */ +struct qoriq_sensor { + int id; +}; + +struct qoriq_tmu_data { + int ver; + struct regmap *regmap; + struct clk *clk; + struct qoriq_sensor sensor[SITES_MAX]; +}; + +static struct qoriq_tmu_data *qoriq_sensor_to_data(struct qoriq_sensor *s) +{ + return container_of(s, struct qoriq_tmu_data, sensor[s->id]); +} + +static int tmu_get_temp(struct thermal_zone_device *tz, int *temp) +{ + struct qoriq_sensor *qsensor = thermal_zone_device_priv(tz); + struct qoriq_tmu_data *qdata = qoriq_sensor_to_data(qsensor); + u32 val; + /* + * REGS_TRITSR(id) has the following layout: + * + * For TMU Rev1: + * 31 ... 7 6 5 4 3 2 1 0 + * V TEMP + * + * Where V bit signifies if the measurement is ready and is + * within sensor range. TEMP is an 8 bit value representing + * temperature in Celsius. + + * For TMU Rev2: + * 31 ... 8 7 6 5 4 3 2 1 0 + * V TEMP + * + * Where V bit signifies if the measurement is ready and is + * within sensor range. TEMP is an 9 bit value representing + * temperature in KelVin. + */ + + regmap_read(qdata->regmap, REGS_TMR, &val); + if (!(val & TMR_ME)) + return -EAGAIN; + + if (regmap_read_poll_timeout(qdata->regmap, + REGS_TRITSR(qsensor->id), + val, + val & TRITSR_V, + USEC_PER_MSEC, + 10 * USEC_PER_MSEC)) + return -ENODATA; + + if (qdata->ver == TMU_VER1) { + *temp = (val & GENMASK(7, 0)) * MILLIDEGREE_PER_DEGREE; + } else { + if (val & TRITSR_TP5) + *temp = milli_kelvin_to_millicelsius((val & GENMASK(8, 0)) * + MILLIDEGREE_PER_DEGREE + 500); + else + *temp = kelvin_to_millicelsius(val & GENMASK(8, 0)); + } + + return 0; +} + +static const struct thermal_zone_device_ops tmu_tz_ops = { + .get_temp = tmu_get_temp, +}; + +static int qoriq_tmu_register_tmu_zone(struct device *dev, + struct qoriq_tmu_data *qdata) +{ + int id, sites = 0; + + for (id = 0; id < SITES_MAX; id++) { + struct thermal_zone_device *tzd; + struct qoriq_sensor *sensor = &qdata->sensor[id]; + int ret; + + sensor->id = id; + + tzd = devm_thermal_of_zone_register(dev, id, + sensor, + &tmu_tz_ops); + ret = PTR_ERR_OR_ZERO(tzd); + if (ret) { + if (ret == -ENODEV) + continue; + + return ret; + } + + if (qdata->ver == TMU_VER1) + sites |= 0x1 << (15 - id); + else + sites |= 0x1 << id; + + devm_thermal_add_hwmon_sysfs(dev, tzd); + } + + if (sites) { + if (qdata->ver == TMU_VER1) { + regmap_write(qdata->regmap, REGS_TMR, TMR_ME | TMR_ALPF | sites); + } else { + regmap_write(qdata->regmap, REGS_V2_TMSR, sites); + regmap_write(qdata->regmap, REGS_TMR, TMR_ME | TMR_ALPF_V2); + } + } + + return 0; +} + +static int qoriq_tmu_calibration(struct device *dev, + struct qoriq_tmu_data *data) +{ + int i, val, len; + u32 range[4]; + const u32 *calibration; + struct device_node *np = dev->of_node; + + len = of_property_count_u32_elems(np, "fsl,tmu-range"); + if (len < 0 || len > 4) { + dev_err(dev, "invalid range data.\n"); + return len; + } + + val = of_property_read_u32_array(np, "fsl,tmu-range", range, len); + if (val != 0) { + dev_err(dev, "failed to read range data.\n"); + return val; + } + + /* Init temperature range registers */ + for (i = 0; i < len; i++) + regmap_write(data->regmap, REGS_TTRnCR(i), range[i]); + + calibration = of_get_property(np, "fsl,tmu-calibration", &len); + if (calibration == NULL || len % 8) { + dev_err(dev, "invalid calibration data.\n"); + return -ENODEV; + } + + for (i = 0; i < len; i += 8, calibration += 2) { + val = of_read_number(calibration, 1); + regmap_write(data->regmap, REGS_TTCFGR, val); + val = of_read_number(calibration + 1, 1); + regmap_write(data->regmap, REGS_TSCFGR, val); + } + + return 0; +} + +static void qoriq_tmu_init_device(struct qoriq_tmu_data *data) +{ + /* Disable interrupt, using polling instead */ + regmap_write(data->regmap, REGS_TIER, TIER_DISABLE); + + /* Set update_interval */ + + if (data->ver == TMU_VER1) { + regmap_write(data->regmap, REGS_TMTMIR, TMTMIR_DEFAULT); + } else { + regmap_write(data->regmap, REGS_V2_TMTMIR, TMTMIR_DEFAULT); + regmap_write(data->regmap, REGS_V2_TEUMR(0), TEUMR0_V2); + } + + /* Disable monitoring */ + regmap_write(data->regmap, REGS_TMR, TMR_DISABLE); +} + +static const struct regmap_range qoriq_yes_ranges[] = { + regmap_reg_range(REGS_TMR, REGS_TSCFGR), + regmap_reg_range(REGS_TTRnCR(0), REGS_TTRnCR(15)), + regmap_reg_range(REGS_V2_TEUMR(0), REGS_V2_TEUMR(2)), + regmap_reg_range(REGS_V2_TMSAR(0), REGS_V2_TMSAR(15)), + regmap_reg_range(REGS_IPBRR(0), REGS_IPBRR(1)), + /* Read only registers below */ + regmap_reg_range(REGS_TRITSR(0), REGS_TRITSR(15)), +}; + +static const struct regmap_access_table qoriq_wr_table = { + .yes_ranges = qoriq_yes_ranges, + .n_yes_ranges = ARRAY_SIZE(qoriq_yes_ranges) - 1, +}; + +static const struct regmap_access_table qoriq_rd_table = { + .yes_ranges = qoriq_yes_ranges, + .n_yes_ranges = ARRAY_SIZE(qoriq_yes_ranges), +}; + +static void qoriq_tmu_action(void *p) +{ + struct qoriq_tmu_data *data = p; + + regmap_write(data->regmap, REGS_TMR, TMR_DISABLE); + clk_disable_unprepare(data->clk); +} + +static int qoriq_tmu_probe(struct platform_device *pdev) +{ + int ret; + u32 ver; + struct qoriq_tmu_data *data; + struct device_node *np = pdev->dev.of_node; + struct device *dev = &pdev->dev; + const bool little_endian = of_property_read_bool(np, "little-endian"); + const enum regmap_endian format_endian = + little_endian ? REGMAP_ENDIAN_LITTLE : REGMAP_ENDIAN_BIG; + const struct regmap_config regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .rd_table = &qoriq_rd_table, + .wr_table = &qoriq_wr_table, + .val_format_endian = format_endian, + .max_register = SZ_4K, + }; + void __iomem *base; + + data = devm_kzalloc(dev, sizeof(struct qoriq_tmu_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + base = devm_platform_ioremap_resource(pdev, 0); + ret = PTR_ERR_OR_ZERO(base); + if (ret) { + dev_err(dev, "Failed to get memory region\n"); + return ret; + } + + data->regmap = devm_regmap_init_mmio(dev, base, ®map_config); + ret = PTR_ERR_OR_ZERO(data->regmap); + if (ret) { + dev_err(dev, "Failed to init regmap (%d)\n", ret); + return ret; + } + + data->clk = devm_clk_get_optional(dev, NULL); + if (IS_ERR(data->clk)) + return PTR_ERR(data->clk); + + ret = clk_prepare_enable(data->clk); + if (ret) { + dev_err(dev, "Failed to enable clock\n"); + return ret; + } + + ret = devm_add_action_or_reset(dev, qoriq_tmu_action, data); + if (ret) + return ret; + + /* version register offset at: 0xbf8 on both v1 and v2 */ + ret = regmap_read(data->regmap, REGS_IPBRR(0), &ver); + if (ret) { + dev_err(&pdev->dev, "Failed to read IP block version\n"); + return ret; + } + data->ver = (ver >> 8) & 0xff; + + qoriq_tmu_init_device(data); /* TMU initialization */ + + ret = qoriq_tmu_calibration(dev, data); /* TMU calibration */ + if (ret < 0) + return ret; + + ret = qoriq_tmu_register_tmu_zone(dev, data); + if (ret < 0) { + dev_err(dev, "Failed to register sensors\n"); + return ret; + } + + platform_set_drvdata(pdev, data); + + return 0; +} + +static int __maybe_unused qoriq_tmu_suspend(struct device *dev) +{ + struct qoriq_tmu_data *data = dev_get_drvdata(dev); + int ret; + + ret = regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, 0); + if (ret) + return ret; + + clk_disable_unprepare(data->clk); + + return 0; +} + +static int __maybe_unused qoriq_tmu_resume(struct device *dev) +{ + int ret; + struct qoriq_tmu_data *data = dev_get_drvdata(dev); + + ret = clk_prepare_enable(data->clk); + if (ret) + return ret; + + /* Enable monitoring */ + return regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, TMR_ME); +} + +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", }, + { .compatible = "fsl,imx8mq-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, +}; +module_platform_driver(qoriq_tmu); + +MODULE_AUTHOR("Jia Hongtao <hongtao.jia@nxp.com>"); +MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver"); +MODULE_LICENSE("GPL v2"); |