1 files changed, 116 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-lpss-platform.c b/drivers/pwm/pwm-lpss-platform.c
new file mode 100644
index 000000000..c6502cf7a
--- /dev/null
+++ b/drivers/pwm/pwm-lpss-platform.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel Low Power Subsystem PWM controller driver
+ *
+ * Copyright (C) 2014, Intel Corporation
+ *
+ * Derived from the original pwm-lpss.c
+ */
+
+#include <linux/acpi.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "pwm-lpss.h"
+
+/* BayTrail */
+static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = {
+	.clk_rate = 25000000,
+	.npwm = 1,
+	.base_unit_bits = 16,
+};
+
+/* Braswell */
+static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = {
+	.clk_rate = 19200000,
+	.npwm = 1,
+	.base_unit_bits = 16,
+	.other_devices_aml_touches_pwm_regs = true,
+};
+
+/* Broxton */
+static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = {
+	.clk_rate = 19200000,
+	.npwm = 4,
+	.base_unit_bits = 22,
+	.bypass = true,
+};
+
+static int pwm_lpss_probe_platform(struct platform_device *pdev)
+{
+	const struct pwm_lpss_boardinfo *info;
+	const struct acpi_device_id *id;
+	struct pwm_lpss_chip *lpwm;
+	struct resource *r;
+
+	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
+	if (!id)
+		return -ENODEV;
+
+	info = (const struct pwm_lpss_boardinfo *)id->driver_data;
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	lpwm = pwm_lpss_probe(&pdev->dev, r, info);
+	if (IS_ERR(lpwm))
+		return PTR_ERR(lpwm);
+
+	platform_set_drvdata(pdev, lpwm);
+
+	dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_SMART_PREPARE);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	return 0;
+}
+
+static int pwm_lpss_remove_platform(struct platform_device *pdev)
+{
+	struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
+
+	pm_runtime_disable(&pdev->dev);
+	return pwm_lpss_remove(lpwm);
+}
+
+static int pwm_lpss_prepare(struct device *dev)
+{
+	struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev);
+
+	/*
+	 * If other device's AML code touches the PWM regs on suspend/resume
+	 * force runtime-resume the PWM controller to allow this.
+	 */
+	if (lpwm->info->other_devices_aml_touches_pwm_regs)
+		return 0; /* Force runtime-resume */
+
+	return 1; /* If runtime-suspended leave as is */
+}
+
+static const struct dev_pm_ops pwm_lpss_platform_pm_ops = {
+	.prepare = pwm_lpss_prepare,
+};
+
+static const struct acpi_device_id pwm_lpss_acpi_match[] = {
+	{ "80860F09", (unsigned long)&pwm_lpss_byt_info },
+	{ "80862288", (unsigned long)&pwm_lpss_bsw_info },
+	{ "80862289", (unsigned long)&pwm_lpss_bsw_info },
+	{ "80865AC8", (unsigned long)&pwm_lpss_bxt_info },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
+
+static struct platform_driver pwm_lpss_driver_platform = {
+	.driver = {
+		.name = "pwm-lpss",
+		.acpi_match_table = pwm_lpss_acpi_match,
+		.pm = &pwm_lpss_platform_pm_ops,
+	},
+	.probe = pwm_lpss_probe_platform,
+	.remove = pwm_lpss_remove_platform,
+};
+module_platform_driver(pwm_lpss_driver_platform);
+
+MODULE_DESCRIPTION("PWM platform driver for Intel LPSS");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:pwm-lpss");