x86/platform/intel-mid: Add power button support for Merrifield

Intel Merrifield platform has a Basin Cove PMIC to handle in particular
power button events. Add necessary bits to enable it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170308112422.67533-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/platform/intel-mid/device_libs/Makefile b/arch/x86/platform/intel-mid/device_libs/Makefile
index a7dbec4dce2758261c6e1680b7ed825e5e44a9d1..3dbde04febdccab382bc47ccba53b422ac7c72ea 100644 (file)
--- a/arch/x86/platform/intel-mid/device_libs/Makefile
+++ b/arch/x86/platform/intel-mid/device_libs/Makefile
@@ -26,5 +26,6 @@ obj-$(subst m,y,$(CONFIG_GPIO_PCA953X)) += platform_pcal9555a.o
 obj-$(subst m,y,$(CONFIG_GPIO_PCA953X)) += platform_tca6416.o
 # MISC Devices
 obj-$(subst m,y,$(CONFIG_KEYBOARD_GPIO)) += platform_gpio_keys.o
+obj-$(subst m,y,$(CONFIG_INTEL_MID_POWER_BUTTON)) += platform_mrfld_power_btn.o
 obj-$(subst m,y,$(CONFIG_RTC_DRV_CMOS)) += platform_mrfld_rtc.o
 obj-$(subst m,y,$(CONFIG_INTEL_MID_WATCHDOG)) += platform_mrfld_wdt.o

diff --git a/arch/x86/platform/intel-mid/device_libs/platform_mrfld_power_btn.c b/arch/x86/platform/intel-mid/device_libs/platform_mrfld_power_btn.c
new file mode 100644 (file)
index 0000000..a6c3705
--- /dev/null
+++ b/arch/x86/platform/intel-mid/device_libs/platform_mrfld_power_btn.c
@@ -0,0 +1,82 @@
+/*
+ * Intel Merrifield power button support
+ *
+ * (C) Copyright 2017 Intel Corporation
+ *
+ * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/sfi.h>
+
+#include <asm/intel-mid.h>
+#include <asm/intel_scu_ipc.h>
+
+static struct resource mrfld_power_btn_resources[] = {
+       {
+               .flags          = IORESOURCE_IRQ,
+       },
+};
+
+static struct platform_device mrfld_power_btn_dev = {
+       .name           = "msic_power_btn",
+       .id             = PLATFORM_DEVID_NONE,
+       .num_resources  = ARRAY_SIZE(mrfld_power_btn_resources),
+       .resource       = mrfld_power_btn_resources,
+};
+
+static int mrfld_power_btn_scu_status_change(struct notifier_block *nb,
+                                            unsigned long code, void *data)
+{
+       if (code == SCU_DOWN) {
+               platform_device_unregister(&mrfld_power_btn_dev);
+               return 0;
+       }
+
+       return platform_device_register(&mrfld_power_btn_dev);
+}
+
+static struct notifier_block mrfld_power_btn_scu_notifier = {
+       .notifier_call  = mrfld_power_btn_scu_status_change,
+};
+
+static int __init register_mrfld_power_btn(void)
+{
+       if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)
+               return -ENODEV;
+
+       /*
+        * We need to be sure that the SCU IPC is ready before
+        * PMIC power button device can be registered:
+        */
+       intel_scu_notifier_add(&mrfld_power_btn_scu_notifier);
+
+       return 0;
+}
+arch_initcall(register_mrfld_power_btn);
+
+static void __init *mrfld_power_btn_platform_data(void *info)
+{
+       struct resource *res = mrfld_power_btn_resources;
+       struct sfi_device_table_entry *pentry = info;
+
+       res->start = res->end = pentry->irq;
+       return NULL;
+}
+
+static const struct devs_id mrfld_power_btn_dev_id __initconst = {
+       .name                   = "bcove_power_btn",
+       .type                   = SFI_DEV_TYPE_IPC,
+       .delay                  = 1,
+       .msic                   = 1,
+       .get_platform_data      = &mrfld_power_btn_platform_data,
+};
+
+sfi_device(mrfld_power_btn_dev_id);