[PATCH v3 5/6] aiodev: Add TEMPMON driver
Andrey Smirnov
andrew.smirnov at gmail.com
Mon May 16 09:46:00 PDT 2016
Port TEMPMON driver from U-Boot
Signed-off-by: Andrey Smirnov <andrew.smirnov at gmail.com>
---
arch/arm/dts/imx6qdl.dtsi | 1 +
drivers/aiodev/Kconfig | 8 ++
drivers/aiodev/Makefile | 1 +
drivers/aiodev/imx_thermal.c | 216 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 226 insertions(+)
create mode 100644 drivers/aiodev/imx_thermal.c
diff --git a/arch/arm/dts/imx6qdl.dtsi b/arch/arm/dts/imx6qdl.dtsi
index 828be9c..06b1039 100644
--- a/arch/arm/dts/imx6qdl.dtsi
+++ b/arch/arm/dts/imx6qdl.dtsi
@@ -8,3 +8,4 @@
ipu0 = &ipu1;
};
};
+
diff --git a/drivers/aiodev/Kconfig b/drivers/aiodev/Kconfig
index d6d4ac0..185c44e 100644
--- a/drivers/aiodev/Kconfig
+++ b/drivers/aiodev/Kconfig
@@ -5,4 +5,12 @@ menuconfig AIODEV
bool "Analog I/O drivers"
if AIODEV
+
+config IMX_THERMAL
+ tristate "Temperature sensor driver for Freescale i.MX SoCs"
+ select MFD_SYSCON
+ help
+ Support for Temperature Monitor (TEMPMON) found on Freescale
+ i.MX SoCs.
+
endif
diff --git a/drivers/aiodev/Makefile b/drivers/aiodev/Makefile
index 806464e..5480a8a 100644
--- a/drivers/aiodev/Makefile
+++ b/drivers/aiodev/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_AIODEV) += core.o
+obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
diff --git a/drivers/aiodev/imx_thermal.c b/drivers/aiodev/imx_thermal.c
new file mode 100644
index 0000000..6c36d2f
--- /dev/null
+++ b/drivers/aiodev/imx_thermal.c
@@ -0,0 +1,216 @@
+/*
+ * imx_thermal
+ *
+ * Copyright (c) 2015 Zodiac Inflight Innovation
+ * Author: Andrey Smirnov <andrew.smirnov at gmail.com>
+ *
+ * based on the code of analogous driver from U-Boot:
+ * (C) Copyright 2014-2015 Freescale Semiconductor, Inc.
+ * Author: Nitin Garg <nitin.garg at freescale.com>
+ * Ye Li <Ye.Li at freescale.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <malloc.h>
+#include <clock.h>
+#include <driver.h>
+#include <xfuncs.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/math64.h>
+#include <linux/log2.h>
+#include <linux/clk.h>
+#include <mach/clock.h>
+#include <mach/imx6-anadig.h>
+#include <io.h>
+#include <aiodev.h>
+#include <mfd/syscon.h>
+
+#define FACTOR0 10000000
+#define MEASURE_FREQ 327
+#define OCOTP_ANA1_OFFSET (0xE * sizeof(uint32_t))
+
+struct imx_thermal_data {
+ int c1, c2;
+ void __iomem *base;
+ struct clk *clk;
+
+ struct aiodevice aiodev;
+ struct aiochannel aiochan;
+};
+
+static inline struct imx_thermal_data *
+to_imx_thermal_data(struct aiochannel *chan)
+{
+ return container_of(chan, struct imx_thermal_data, aiochan);
+}
+
+
+static int imx_thermal_read(struct aiochannel *chan, int *val)
+{
+ uint64_t start;
+ uint32_t tempsense0, tempsense1;
+ uint16_t n_meas;
+ struct imx_thermal_data *imx_thermal = to_imx_thermal_data(chan);
+
+ /*
+ * now we only use single measure, every time we read
+ * the temperature, we will power on/down anadig thermal
+ * module
+ */
+ writel(BM_ANADIG_TEMPSENSE0_POWER_DOWN,
+ imx_thermal->base + HW_ANADIG_TEMPSENSE0_CLR);
+ writel(BM_ANADIG_ANA_MISC0_REFTOP_SELBIASOFF,
+ imx_thermal->base + HW_ANADIG_ANA_MISC0_SET);
+
+ /* setup measure freq */
+ tempsense1 = readl(imx_thermal->base + HW_ANADIG_TEMPSENSE1);
+ tempsense1 &= ~BM_ANADIG_TEMPSENSE1_MEASURE_FREQ;
+ tempsense1 |= MEASURE_FREQ;
+ writel(tempsense1, imx_thermal->base + HW_ANADIG_TEMPSENSE1);
+
+ /* start the measurement process */
+ writel(BM_ANADIG_TEMPSENSE0_MEASURE_TEMP,
+ imx_thermal->base + HW_ANADIG_TEMPSENSE0_CLR);
+ writel(BM_ANADIG_TEMPSENSE0_FINISHED,
+ imx_thermal->base + HW_ANADIG_TEMPSENSE0_CLR);
+ writel(BM_ANADIG_TEMPSENSE0_MEASURE_TEMP,
+ imx_thermal->base + HW_ANADIG_TEMPSENSE0_SET);
+
+ /* make sure that the latest temp is valid */
+ start = get_time_ns();
+ do {
+ tempsense0 = readl(imx_thermal->base + HW_ANADIG_TEMPSENSE0);
+
+ if (is_timeout(start, 1 * SECOND)) {
+ dev_err(imx_thermal->aiodev.hwdev,
+ "Timeout waiting for measurement\n");
+ return -EIO;
+ }
+ } while (!(tempsense0 & BM_ANADIG_TEMPSENSE0_FINISHED));
+
+ n_meas = (tempsense0 & BM_ANADIG_TEMPSENSE0_TEMP_VALUE)
+ >> BP_ANADIG_TEMPSENSE0_TEMP_VALUE;
+ writel(BM_ANADIG_TEMPSENSE0_FINISHED,
+ imx_thermal->base + HW_ANADIG_TEMPSENSE0_CLR);
+
+ *val = (int)n_meas * imx_thermal->c1 + imx_thermal->c2;
+
+ /* power down anatop thermal sensor */
+ writel(BM_ANADIG_TEMPSENSE0_POWER_DOWN,
+ imx_thermal->base + HW_ANADIG_TEMPSENSE0_SET);
+ writel(BM_ANADIG_ANA_MISC0_REFTOP_SELBIASOFF,
+ imx_thermal->base + HW_ANADIG_ANA_MISC0_CLR);
+
+ return 0;
+}
+
+static int imx_thermal_probe(struct device_d *dev)
+{
+ uint32_t ocotp_ana1;
+ struct device_node *node;
+ struct imx_thermal_data *imx_thermal;
+ struct cdev *ocotp;
+ int t1, n1, t2, n2;
+ int ret;
+
+ node = of_parse_phandle(dev->device_node, "fsl,tempmon-data", 0);
+ if (!node) {
+ dev_err(dev, "No calibration data source\n");
+ return -ENODEV;
+ }
+
+ printf("node = %p\n", node);
+
+ ocotp = cdev_by_device_node(node);
+ if (!ocotp) {
+ dev_err(dev, "No OCOTP character device\n");
+ return -ENODEV;
+ }
+
+ ret = cdev_read(ocotp, &ocotp_ana1, sizeof(ocotp_ana1),
+ OCOTP_ANA1_OFFSET, 0);
+ if (ret != sizeof(ocotp_ana1)) {
+ dev_err(dev, "Failed to read calibration data\n");
+ return ret < 0 ? ret : -EIO;
+ }
+
+ imx_thermal = xzalloc(sizeof(*imx_thermal));
+ imx_thermal->base = syscon_base_lookup_by_phandle(dev->device_node,
+ "fsl,tempmon");
+ if (IS_ERR(imx_thermal->base)) {
+ dev_err(dev, "Could not get ANATOP address\n");
+ ret = PTR_ERR(imx_thermal->base);
+ goto free_imx_thermal;
+ }
+
+ n1 = ocotp_ana1 >> 20;
+ t1 = 25;
+ n2 = (ocotp_ana1 & 0x000FFF00) >> 8;
+ t2 = ocotp_ana1 & 0xFF;
+
+ imx_thermal->c1 = (-1000 * (t2 - t1)) / (n1 - n2);
+ imx_thermal->c2 = 1000 * t2 + (1000 * n2 * (t2 - t1)) / (n1 - n2);
+
+ imx_thermal->clk = clk_get(dev, NULL);
+ if (IS_ERR(imx_thermal->clk)) {
+ ret = PTR_ERR(imx_thermal->clk);
+ goto free_imx_thermal;
+ }
+
+ ret = clk_enable(imx_thermal->clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable clock: %s\n",
+ strerror(ret));
+ goto put_clock;
+ }
+
+ imx_thermal->aiodev.num_channels = 1;
+ imx_thermal->aiodev.hwdev = dev;
+ imx_thermal->aiodev.channels =
+ xmalloc(imx_thermal->aiodev.num_channels *
+ sizeof(imx_thermal->aiodev.channels[0]));
+ imx_thermal->aiodev.channels[0] = &imx_thermal->aiochan;
+ imx_thermal->aiochan.unit = "mC";
+ imx_thermal->aiodev.read = imx_thermal_read;
+
+ ret = aiodevice_register(&imx_thermal->aiodev);
+ if (!ret)
+ goto done;
+
+ clk_disable(imx_thermal->clk);
+put_clock:
+ clk_put(imx_thermal->clk);
+free_imx_thermal:
+ kfree(imx_thermal);
+done:
+ return ret;
+}
+
+static const struct of_device_id of_imx_thermal_match[] = {
+ { .compatible = "fsl,imx6q-tempmon", },
+ { .compatible = "fsl,imx6sx-tempmon", },
+ { /* end */ }
+};
+
+
+static struct driver_d imx_thermal_driver = {
+ .name = "imx_thermal",
+ .probe = imx_thermal_probe,
+ .of_compatible = DRV_OF_COMPAT(of_imx_thermal_match),
+};
+
+device_platform_driver(imx_thermal_driver);
--
2.5.5
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