diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/thermal/broadcom/sr-thermal.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/drivers/thermal/broadcom/sr-thermal.c b/drivers/thermal/broadcom/sr-thermal.c new file mode 100644 index 000000000..2b9350254 --- /dev/null +++ b/drivers/thermal/broadcom/sr-thermal.c @@ -0,0 +1,116 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Broadcom + */ + +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/thermal.h> + +/* + * In stingray thermal IO memory, + * Total Number of available TMONs MASK is at offset 0 + * temperature registers BASE is at 4 byte offset. + * Each TMON temperature register size is 4. + */ +#define SR_TMON_TEMP_BASE(id) ((id) * 0x4) + +#define SR_TMON_MAX_LIST 6 + +struct sr_tmon { + unsigned int crit_temp; + unsigned int tmon_id; + struct sr_thermal *priv; +}; + +struct sr_thermal { + void __iomem *regs; + unsigned int max_crit_temp; + struct sr_tmon tmon[SR_TMON_MAX_LIST]; +}; + +static int sr_get_temp(struct thermal_zone_device *tz, int *temp) +{ + struct sr_tmon *tmon = tz->devdata; + struct sr_thermal *sr_thermal = tmon->priv; + + *temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id)); + + return 0; +} + +static const struct thermal_zone_device_ops sr_tz_ops = { + .get_temp = sr_get_temp, +}; + +static int sr_thermal_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct thermal_zone_device *tz; + struct sr_thermal *sr_thermal; + struct sr_tmon *tmon; + struct resource *res; + u32 sr_tmon_list = 0; + unsigned int i; + int ret; + + sr_thermal = devm_kzalloc(dev, sizeof(*sr_thermal), GFP_KERNEL); + if (!sr_thermal) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENOENT; + + sr_thermal->regs = (void __iomem *)devm_memremap(&pdev->dev, res->start, + resource_size(res), + MEMREMAP_WB); + if (IS_ERR(sr_thermal->regs)) { + dev_err(dev, "failed to get io address\n"); + return PTR_ERR(sr_thermal->regs); + } + + ret = device_property_read_u32(dev, "brcm,tmon-mask", &sr_tmon_list); + if (ret) + return ret; + + tmon = sr_thermal->tmon; + for (i = 0; i < SR_TMON_MAX_LIST; i++, tmon++) { + if (!(sr_tmon_list & BIT(i))) + continue; + + /* Flush temperature registers */ + writel(0, sr_thermal->regs + SR_TMON_TEMP_BASE(i)); + tmon->tmon_id = i; + tmon->priv = sr_thermal; + tz = devm_thermal_of_zone_register(dev, i, tmon, + &sr_tz_ops); + if (IS_ERR(tz)) + return PTR_ERR(tz); + + dev_dbg(dev, "thermal sensor %d registered\n", i); + } + platform_set_drvdata(pdev, sr_thermal); + + return 0; +} + +static const struct of_device_id sr_thermal_of_match[] = { + { .compatible = "brcm,sr-thermal", }, + {}, +}; +MODULE_DEVICE_TABLE(of, sr_thermal_of_match); + +static struct platform_driver sr_thermal_driver = { + .probe = sr_thermal_probe, + .driver = { + .name = "sr-thermal", + .of_match_table = sr_thermal_of_match, + }, +}; +module_platform_driver(sr_thermal_driver); + +MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>"); +MODULE_DESCRIPTION("Stingray thermal driver"); +MODULE_LICENSE("GPL v2"); |