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authorNilesh Bacchewar <nilesh.bacchewar@intel.com>2016-11-07 12:11:47 -0800
committerDarren Hart <dvhart@linux.intel.com>2016-12-18 14:56:37 -0800
commit957ae5098185e763b5c06be6c3b4b6e98c048712 (patch)
treebe634c48fc0c9d6bdfacd07073269e68af1f564f /drivers/platform
parente297046875f2c5a43684f54f0fd098249b4f293a (diff)
downloadlinux-957ae5098185e763b5c06be6c3b4b6e98c048712.tar.bz2
platform/x86: Add Whiskey Cove PMIC TMU support
This adds TMU (Time Management Unit) support for Intel BXT platform. It enables the alarm wake-up functionality in the TMU unit of Whiskey Cove PMIC. Signed-off-by: Nilesh Bacchewar <nilesh.bacchewar@intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> [andy: resolve merge conflict in Kconfig] Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/Kconfig9
-rw-r--r--drivers/platform/x86/Makefile1
-rw-r--r--drivers/platform/x86/intel_bxtwc_tmu.c162
3 files changed, 172 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 493e3386fbf6..5fe8be089b8b 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1017,6 +1017,15 @@ config INTEL_PMC_IPC
The PMC is an ARC processor which defines IPC commands for communication
with other entities in the CPU.
+config INTEL_BXTWC_PMIC_TMU
+ tristate "Intel BXT Whiskey Cove TMU Driver"
+ depends on REGMAP
+ depends on INTEL_SOC_PMIC && INTEL_PMC_IPC
+ ---help---
+ Select this driver to use Intel BXT Whiskey Cove PMIC TMU feature.
+ This driver enables the alarm wakeup functionality in the TMU unit
+ of Whiskey Cove PMIC.
+
config SURFACE_PRO3_BUTTON
tristate "Power/home/volume buttons driver for Microsoft Surface Pro 3/4 tablet"
depends on ACPI && INPUT
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index e9290290f026..d4111f0f8a78 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_INTEL_PMC_IPC) += intel_pmc_ipc.o
obj-$(CONFIG_SURFACE_PRO3_BUTTON) += surfacepro3_button.o
obj-$(CONFIG_SURFACE_3_BUTTON) += surface3_button.o
obj-$(CONFIG_INTEL_PUNIT_IPC) += intel_punit_ipc.o
+obj-$(CONFIG_INTEL_BXTWC_PMIC_TMU) += intel_bxtwc_tmu.o
obj-$(CONFIG_INTEL_TELEMETRY) += intel_telemetry_core.o \
intel_telemetry_pltdrv.o \
intel_telemetry_debugfs.o
diff --git a/drivers/platform/x86/intel_bxtwc_tmu.c b/drivers/platform/x86/intel_bxtwc_tmu.c
new file mode 100644
index 000000000000..e202abd5b0df
--- /dev/null
+++ b/drivers/platform/x86/intel_bxtwc_tmu.c
@@ -0,0 +1,162 @@
+/*
+ * intel_bxtwc_tmu.c - Intel BXT Whiskey Cove PMIC TMU driver
+ *
+ * Copyright (C) 2016 Intel Corporation. All rights reserved.
+ *
+ * This driver adds TMU (Time Management Unit) support for Intel BXT platform.
+ * It enables the alarm wake-up functionality in the TMU unit of Whiskey Cove
+ * PMIC.
+ *
+ * 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 <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/intel_soc_pmic.h>
+
+#define BXTWC_TMUIRQ 0x4fb6
+#define BXTWC_MIRQLVL1 0x4e0e
+#define BXTWC_MTMUIRQ_REG 0x4fb7
+#define BXTWC_MIRQLVL1_MTMU BIT(1)
+#define BXTWC_TMU_WK_ALRM BIT(1)
+#define BXTWC_TMU_SYS_ALRM BIT(2)
+#define BXTWC_TMU_ALRM_MASK (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
+#define BXTWC_TMU_ALRM_IRQ (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
+
+struct wcove_tmu {
+ int irq;
+ struct device *dev;
+ struct regmap *regmap;
+};
+
+static irqreturn_t bxt_wcove_tmu_irq_handler(int irq, void *data)
+{
+ struct wcove_tmu *wctmu = data;
+ unsigned int tmu_irq;
+
+ /* Read TMU interrupt reg */
+ regmap_read(wctmu->regmap, BXTWC_TMUIRQ, &tmu_irq);
+ if (tmu_irq & BXTWC_TMU_ALRM_IRQ) {
+ /* clear TMU irq */
+ regmap_write(wctmu->regmap, BXTWC_TMUIRQ, tmu_irq);
+ return IRQ_HANDLED;
+ }
+ return IRQ_NONE;
+}
+
+static int bxt_wcove_tmu_probe(struct platform_device *pdev)
+{
+ struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
+ struct regmap_irq_chip_data *regmap_irq_chip;
+ struct wcove_tmu *wctmu;
+ int ret, virq, irq;
+
+ wctmu = devm_kzalloc(&pdev->dev, sizeof(*wctmu), GFP_KERNEL);
+ if (!wctmu)
+ return -ENOMEM;
+
+ wctmu->dev = &pdev->dev;
+ wctmu->regmap = pmic->regmap;
+
+ irq = platform_get_irq(pdev, 0);
+
+ if (irq < 0) {
+ dev_err(&pdev->dev, "invalid irq %d\n", irq);
+ return irq;
+ }
+
+ regmap_irq_chip = pmic->irq_chip_data_tmu;
+ virq = regmap_irq_get_virq(regmap_irq_chip, irq);
+ if (virq < 0) {
+ dev_err(&pdev->dev,
+ "failed to get virtual interrupt=%d\n", irq);
+ return virq;
+ }
+
+ ret = devm_request_threaded_irq(&pdev->dev, virq,
+ NULL, bxt_wcove_tmu_irq_handler,
+ IRQF_ONESHOT, "bxt_wcove_tmu", wctmu);
+ if (ret) {
+ dev_err(&pdev->dev, "request irq failed: %d,virq: %d\n",
+ ret, virq);
+ return ret;
+ }
+ wctmu->irq = virq;
+
+ /* Enable TMU interrupts */
+ regmap_update_bits(wctmu->regmap, BXTWC_MIRQLVL1,
+ BXTWC_MIRQLVL1_MTMU, 0);
+
+ /* Unmask TMU second level Wake & System alarm */
+ regmap_update_bits(wctmu->regmap, BXTWC_MTMUIRQ_REG,
+ BXTWC_TMU_ALRM_MASK, 0);
+
+ platform_set_drvdata(pdev, wctmu);
+ return 0;
+}
+
+static int bxt_wcove_tmu_remove(struct platform_device *pdev)
+{
+ struct wcove_tmu *wctmu = platform_get_drvdata(pdev);
+ unsigned int val;
+
+ /* Mask TMU interrupts */
+ regmap_read(wctmu->regmap, BXTWC_MIRQLVL1, &val);
+ regmap_write(wctmu->regmap, BXTWC_MIRQLVL1,
+ val | BXTWC_MIRQLVL1_MTMU);
+ regmap_read(wctmu->regmap, BXTWC_MTMUIRQ_REG, &val);
+ regmap_write(wctmu->regmap, BXTWC_MTMUIRQ_REG,
+ val | BXTWC_TMU_ALRM_MASK);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int bxtwc_tmu_suspend(struct device *dev)
+{
+ struct wcove_tmu *wctmu = dev_get_drvdata(dev);
+
+ enable_irq_wake(wctmu->irq);
+ return 0;
+}
+
+static int bxtwc_tmu_resume(struct device *dev)
+{
+ struct wcove_tmu *wctmu = dev_get_drvdata(dev);
+
+ disable_irq_wake(wctmu->irq);
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(bxtwc_tmu_pm_ops, bxtwc_tmu_suspend, bxtwc_tmu_resume);
+
+static const struct platform_device_id bxt_wcove_tmu_id_table[] = {
+ { .name = "bxt_wcove_tmu" },
+ {},
+};
+MODULE_DEVICE_TABLE(platform, bxt_wcove_tmu_id_table);
+
+static struct platform_driver bxt_wcove_tmu_driver = {
+ .probe = bxt_wcove_tmu_probe,
+ .remove = bxt_wcove_tmu_remove,
+ .driver = {
+ .name = "bxt_wcove_tmu",
+ .pm = &bxtwc_tmu_pm_ops,
+ },
+ .id_table = bxt_wcove_tmu_id_table,
+};
+
+module_platform_driver(bxt_wcove_tmu_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Nilesh Bacchewar <nilesh.bacchewar@intel.com>");
+MODULE_DESCRIPTION("BXT Whiskey Cove TMU Driver");