This is a platform driver for the arche platform controller that hooks
into the USB hub that talks to the USB<->Unipro bridge chip.
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/greybus/arche-apb-ctrl.c | 522 ++++++++++++++++++++++++
drivers/greybus/arche-platform.c | 828 +++++++++++++++++++++++++++++++++++++++
drivers/greybus/arche_platform.h | 39 +
3 files changed, 1389 insertions(+)
--- /dev/null
+++ b/drivers/greybus/arche-apb-ctrl.c
@@ -0,0 +1,522 @@
+/*
+ * Arche Platform driver to control APB.
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spinlock.h>
+#include "arche_platform.h"
+
+
+struct arche_apb_ctrl_drvdata {
+ /* Control GPIO signals to and from AP <=> AP Bridges */
+ int resetn_gpio;
+ int boot_ret_gpio;
+ int pwroff_gpio;
+ int wake_in_gpio;
+ int wake_out_gpio;
+ int pwrdn_gpio;
+
+ enum arche_platform_state state;
+ bool init_disabled;
+
+ struct regulator *vcore;
+ struct regulator *vio;
+
+ int clk_en_gpio;
+ struct clk *clk;
+
+ struct pinctrl *pinctrl;
+ struct pinctrl_state *pin_default;
+
+ /* V2: SPI Bus control */
+ int spi_en_gpio;
+ bool spi_en_polarity_high;
+};
+
+/*
+ * Note that these low level api's are active high
+ */
+static inline void deassert_reset(unsigned int gpio)
+{
+ gpio_set_value(gpio, 1);
+}
+
+static inline void assert_reset(unsigned int gpio)
+{
+ gpio_set_value(gpio, 0);
+}
+
+/*
+ * Note: Please do not modify the below sequence, as it is as per the spec
+ */
+static int coldboot_seq(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+ int ret;
+
+ if (apb->init_disabled ||
+ apb->state == ARCHE_PLATFORM_STATE_ACTIVE)
+ return 0;
+
+ /* Hold APB in reset state */
+ assert_reset(apb->resetn_gpio);
+
+ if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
+ gpio_is_valid(apb->spi_en_gpio))
+ devm_gpio_free(dev, apb->spi_en_gpio);
+
+ /* Enable power to APB */
+ if (!IS_ERR(apb->vcore)) {
+ ret = regulator_enable(apb->vcore);
+ if (ret) {
+ dev_err(dev, "failed to enable core regulator\n");
+ return ret;
+ }
+ }
+
+ if (!IS_ERR(apb->vio)) {
+ ret = regulator_enable(apb->vio);
+ if (ret) {
+ dev_err(dev, "failed to enable IO regulator\n");
+ return ret;
+ }
+ }
+
+ apb_bootret_deassert(dev);
+
+ /* On DB3 clock was not mandatory */
+ if (gpio_is_valid(apb->clk_en_gpio))
+ gpio_set_value(apb->clk_en_gpio, 1);
+
+ usleep_range(100, 200);
+
+ /* deassert reset to APB : Active-low signal */
+ deassert_reset(apb->resetn_gpio);
+
+ apb->state = ARCHE_PLATFORM_STATE_ACTIVE;
+
+ return 0;
+}
+
+static int fw_flashing_seq(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+ int ret;
+
+ if (apb->init_disabled ||
+ apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
+ return 0;
+
+ ret = regulator_enable(apb->vcore);
+ if (ret) {
+ dev_err(dev, "failed to enable core regulator\n");
+ return ret;
+ }
+
+ ret = regulator_enable(apb->vio);
+ if (ret) {
+ dev_err(dev, "failed to enable IO regulator\n");
+ return ret;
+ }
+
+ if (gpio_is_valid(apb->spi_en_gpio)) {
+ unsigned long flags;
+
+ if (apb->spi_en_polarity_high)
+ flags = GPIOF_OUT_INIT_HIGH;
+ else
+ flags = GPIOF_OUT_INIT_LOW;
+
+ ret = devm_gpio_request_one(dev, apb->spi_en_gpio,
+ flags, "apb_spi_en");
+ if (ret) {
+ dev_err(dev, "Failed requesting SPI bus en gpio %d\n",
+ apb->spi_en_gpio);
+ return ret;
+ }
+ }
+
+ /* for flashing device should be in reset state */
+ assert_reset(apb->resetn_gpio);
+ apb->state = ARCHE_PLATFORM_STATE_FW_FLASHING;
+
+ return 0;
+}
+
+static int standby_boot_seq(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+
+ if (apb->init_disabled)
+ return 0;
+
+ /* Even if it is in OFF state, then we do not want to change the state
*/
+ if (apb->state == ARCHE_PLATFORM_STATE_STANDBY ||
+ apb->state == ARCHE_PLATFORM_STATE_OFF)
+ return 0;
+
+ if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
+ gpio_is_valid(apb->spi_en_gpio))
+ devm_gpio_free(dev, apb->spi_en_gpio);
+
+ /*
+ * As per WDM spec, do nothing
+ *
+ * Pasted from WDM spec,
+ * - A falling edge on POWEROFF_L is detected (a)
+ * - WDM enters standby mode, but no output signals are changed
+ * */
+
+ /* TODO: POWEROFF_L is input to WDM module */
+ apb->state = ARCHE_PLATFORM_STATE_STANDBY;
+ return 0;
+}
+
+static void poweroff_seq(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+
+ if (apb->init_disabled || apb->state == ARCHE_PLATFORM_STATE_OFF)
+ return;
+
+ if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
+ gpio_is_valid(apb->spi_en_gpio))
+ devm_gpio_free(dev, apb->spi_en_gpio);
+
+ /* disable the clock */
+ if (gpio_is_valid(apb->clk_en_gpio))
+ gpio_set_value(apb->clk_en_gpio, 0);
+
+ if (!IS_ERR(apb->vcore) && regulator_is_enabled(apb->vcore) > 0)
+ regulator_disable(apb->vcore);
+
+ if (!IS_ERR(apb->vio) && regulator_is_enabled(apb->vio) > 0)
+ regulator_disable(apb->vio);
+
+ /* As part of exit, put APB back in reset state */
+ assert_reset(apb->resetn_gpio);
+ apb->state = ARCHE_PLATFORM_STATE_OFF;
+
+ /* TODO: May have to send an event to SVC about this exit */
+}
+
+void apb_bootret_assert(struct device *dev)
+{
+ struct arche_apb_ctrl_drvdata *apb = dev_get_drvdata(dev);
+
+ gpio_set_value(apb->boot_ret_gpio, 1);
+}
+
+void apb_bootret_deassert(struct device *dev)
+{
+ struct arche_apb_ctrl_drvdata *apb = dev_get_drvdata(dev);
+
+ gpio_set_value(apb->boot_ret_gpio, 0);
+}
+
+int apb_ctrl_coldboot(struct device *dev)
+{
+ return coldboot_seq(to_platform_device(dev));
+}
+
+int apb_ctrl_fw_flashing(struct device *dev)
+{
+ return fw_flashing_seq(to_platform_device(dev));
+}
+
+int apb_ctrl_standby_boot(struct device *dev)
+{
+ return standby_boot_seq(to_platform_device(dev));
+}
+
+void apb_ctrl_poweroff(struct device *dev)
+{
+ poweroff_seq(to_platform_device(dev));
+}
+
+static ssize_t state_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+ int ret = 0;
+ bool is_disabled;
+
+ if (sysfs_streq(buf, "off")) {
+ if (apb->state == ARCHE_PLATFORM_STATE_OFF)
+ return count;
+
+ poweroff_seq(pdev);
+ } else if (sysfs_streq(buf, "active")) {
+ if (apb->state == ARCHE_PLATFORM_STATE_ACTIVE)
+ return count;
+
+ poweroff_seq(pdev);
+ is_disabled = apb->init_disabled;
+ apb->init_disabled = false;
+ ret = coldboot_seq(pdev);
+ if (ret)
+ apb->init_disabled = is_disabled;
+ } else if (sysfs_streq(buf, "standby")) {
+ if (apb->state == ARCHE_PLATFORM_STATE_STANDBY)
+ return count;
+
+ ret = standby_boot_seq(pdev);
+ } else if (sysfs_streq(buf, "fw_flashing")) {
+ if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
+ return count;
+
+ /* First we want to make sure we power off everything
+ * and then enter FW flashing state */
+ poweroff_seq(pdev);
+ ret = fw_flashing_seq(pdev);
+ } else {
+ dev_err(dev, "unknown state\n");
+ ret = -EINVAL;
+ }
+
+ return ret ? ret : count;
+}
+
+static ssize_t state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct arche_apb_ctrl_drvdata *apb = dev_get_drvdata(dev);
+
+ switch (apb->state) {
+ case ARCHE_PLATFORM_STATE_OFF:
+ return sprintf(buf, "off%s\n",
+ apb->init_disabled ? ",disabled" : "");
+ case ARCHE_PLATFORM_STATE_ACTIVE:
+ return sprintf(buf, "active\n");
+ case ARCHE_PLATFORM_STATE_STANDBY:
+ return sprintf(buf, "standby\n");
+ case ARCHE_PLATFORM_STATE_FW_FLASHING:
+ return sprintf(buf, "fw_flashing\n");
+ default:
+ return sprintf(buf, "unknown state\n");
+ }
+}
+
+static DEVICE_ATTR_RW(state);
+
+static int apb_ctrl_get_devtree_data(struct platform_device *pdev,
+ struct arche_apb_ctrl_drvdata *apb)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ int ret;
+
+ apb->resetn_gpio = of_get_named_gpio(np, "reset-gpios", 0);
+ if (apb->resetn_gpio < 0) {
+ dev_err(dev, "failed to get reset gpio\n");
+ return apb->resetn_gpio;
+ }
+ ret = devm_gpio_request_one(dev, apb->resetn_gpio,
+ GPIOF_OUT_INIT_LOW, "apb-reset");
+ if (ret) {
+ dev_err(dev, "Failed requesting reset gpio %d\n",
+ apb->resetn_gpio);
+ return ret;
+ }
+
+ apb->boot_ret_gpio = of_get_named_gpio(np, "boot-ret-gpios", 0);
+ if (apb->boot_ret_gpio < 0) {
+ dev_err(dev, "failed to get boot retention gpio\n");
+ return apb->boot_ret_gpio;
+ }
+ ret = devm_gpio_request_one(dev, apb->boot_ret_gpio,
+ GPIOF_OUT_INIT_LOW, "boot retention");
+ if (ret) {
+ dev_err(dev, "Failed requesting bootret gpio %d\n",
+ apb->boot_ret_gpio);
+ return ret;
+ }
+
+ /* It's not mandatory to support power management interface */
+ apb->pwroff_gpio = of_get_named_gpio(np, "pwr-off-gpios", 0);
+ if (apb->pwroff_gpio < 0) {
+ dev_err(dev, "failed to get power off gpio\n");
+ return apb->pwroff_gpio;
+ }
+ ret = devm_gpio_request_one(dev, apb->pwroff_gpio,
+ GPIOF_IN, "pwroff_n");
+ if (ret) {
+ dev_err(dev, "Failed requesting pwroff_n gpio %d\n",
+ apb->pwroff_gpio);
+ return ret;
+ }
+
+ /* Do not make clock mandatory as of now (for DB3) */
+ apb->clk_en_gpio = of_get_named_gpio(np, "clock-en-gpio", 0);
+ if (apb->clk_en_gpio < 0) {
+ dev_warn(dev, "failed to get clock en gpio\n");
+ } else if (gpio_is_valid(apb->clk_en_gpio)) {
+ ret = devm_gpio_request_one(dev, apb->clk_en_gpio,
+ GPIOF_OUT_INIT_LOW, "apb_clk_en");
+ if (ret) {
+ dev_warn(dev, "Failed requesting APB clock en gpio
%d\n",
+ apb->clk_en_gpio);
+ return ret;
+ }
+ }
+
+ apb->pwrdn_gpio = of_get_named_gpio(np, "pwr-down-gpios", 0);
+ if (apb->pwrdn_gpio < 0)
+ dev_warn(dev, "failed to get power down gpio\n");
+
+ /* Regulators are optional, as we may have fixed supply coming in */
+ apb->vcore = devm_regulator_get(dev, "vcore");
+ if (IS_ERR(apb->vcore))
+ dev_warn(dev, "no core regulator found\n");
+
+ apb->vio = devm_regulator_get(dev, "vio");
+ if (IS_ERR(apb->vio))
+ dev_warn(dev, "no IO regulator found\n");
+
+ apb->pinctrl = devm_pinctrl_get(&pdev->dev);
+ if (IS_ERR(apb->pinctrl)) {
+ dev_err(&pdev->dev, "could not get pinctrl handle\n");
+ return PTR_ERR(apb->pinctrl);
+ }
+ apb->pin_default = pinctrl_lookup_state(apb->pinctrl, "default");
+ if (IS_ERR(apb->pin_default)) {
+ dev_err(&pdev->dev, "could not get default pin state\n");
+ return PTR_ERR(apb->pin_default);
+ }
+
+ /* Only applicable for platform >= V2 */
+ apb->spi_en_gpio = of_get_named_gpio(np, "spi-en-gpio", 0);
+ if (apb->spi_en_gpio >= 0) {
+ if (of_property_read_bool(pdev->dev.of_node,
+ "spi-en-active-high"))
+ apb->spi_en_polarity_high = true;
+ }
+
+ return 0;
+}
+
+static int arche_apb_ctrl_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct arche_apb_ctrl_drvdata *apb;
+ struct device *dev = &pdev->dev;
+
+ apb = devm_kzalloc(&pdev->dev, sizeof(*apb), GFP_KERNEL);
+ if (!apb)
+ return -ENOMEM;
+
+ ret = apb_ctrl_get_devtree_data(pdev, apb);
+ if (ret) {
+ dev_err(dev, "failed to get apb devicetree data %d\n", ret);
+ return ret;
+ }
+
+ /* Initially set APB to OFF state */
+ apb->state = ARCHE_PLATFORM_STATE_OFF;
+ /* Check whether device needs to be enabled on boot */
+ if (of_property_read_bool(pdev->dev.of_node, "arche,init-disable"))
+ apb->init_disabled = true;
+
+ platform_set_drvdata(pdev, apb);
+
+ /* Create sysfs interface to allow user to change state dynamically */
+ ret = device_create_file(dev, &dev_attr_state);
+ if (ret) {
+ dev_err(dev, "failed to create state file in sysfs\n");
+ return ret;
+ }
+
+ dev_info(&pdev->dev, "Device registered successfully\n");
+ return 0;
+}
+
+static int arche_apb_ctrl_remove(struct platform_device *pdev)
+{
+ device_remove_file(&pdev->dev, &dev_attr_state);
+ poweroff_seq(pdev);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static int arche_apb_ctrl_suspend(struct device *dev)
+{
+ /*
+ * If timing profile permits, we may shutdown bridge
+ * completely
+ *
+ * TODO: sequence ??
+ *
+ * Also, need to make sure we meet precondition for unipro suspend
+ * Precondition: Definition ???
+ */
+ return 0;
+}
+
+static int arche_apb_ctrl_resume(struct device *dev)
+{
+ /*
+ * Atleast for ES2 we have to meet the delay requirement between
+ * unipro switch and AP bridge init, depending on whether bridge is in
+ * OFF state or standby state.
+ *
+ * Based on whether bridge is in standby or OFF state we may have to
+ * assert multiple signals. Please refer to WDM spec, for more info.
+ *
+ */
+ return 0;
+}
+
+static void arche_apb_ctrl_shutdown(struct platform_device *pdev)
+{
+ apb_ctrl_poweroff(&pdev->dev);
+}
+
+static SIMPLE_DEV_PM_OPS(arche_apb_ctrl_pm_ops, arche_apb_ctrl_suspend,
+ arche_apb_ctrl_resume);
+
+static struct of_device_id arche_apb_ctrl_of_match[] = {
+ { .compatible = "usbffff,2", },
+ { },
+};
+
+static struct platform_driver arche_apb_ctrl_device_driver = {
+ .probe = arche_apb_ctrl_probe,
+ .remove = arche_apb_ctrl_remove,
+ .shutdown = arche_apb_ctrl_shutdown,
+ .driver = {
+ .name = "arche-apb-ctrl",
+ .pm = &arche_apb_ctrl_pm_ops,
+ .of_match_table = arche_apb_ctrl_of_match,
+ }
+};
+
+int __init arche_apb_init(void)
+{
+ return platform_driver_register(&arche_apb_ctrl_device_driver);
+}
+
+void __exit arche_apb_exit(void)
+{
+ platform_driver_unregister(&arche_apb_ctrl_device_driver);
+}
--- /dev/null
+++ b/drivers/greybus/arche-platform.c
@@ -0,0 +1,828 @@
+/*
+ * Arche Platform driver to enable Unipro link.
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/suspend.h>
+#include <linux/time.h>
+#include "arche_platform.h"
+#include "greybus.h"
+
+#include <linux/usb/usb3613.h>
+
+#define WD_COLDBOOT_PULSE_WIDTH_MS 30
+
+enum svc_wakedetect_state {
+ WD_STATE_IDLE, /* Default state = pulled high/low */
+ WD_STATE_BOOT_INIT, /* WD = falling edge (low) */
+ WD_STATE_COLDBOOT_TRIG, /* WD = rising edge (high), > 30msec */
+ WD_STATE_STANDBYBOOT_TRIG, /* As of now not used ?? */
+ WD_STATE_COLDBOOT_START, /* Cold boot process started */
+ WD_STATE_STANDBYBOOT_START, /* Not used */
+ WD_STATE_TIMESYNC,
+};
+
+struct arche_platform_drvdata {
+ /* Control GPIO signals to and from AP <=> SVC */
+ int svc_reset_gpio;
+ bool is_reset_act_hi;
+ int svc_sysboot_gpio;
+ int wake_detect_gpio; /* bi-dir,maps to WAKE_MOD & WAKE_FRAME signals */
+
+ enum arche_platform_state state;
+
+ int svc_refclk_req;
+ struct clk *svc_ref_clk;
+
+ struct pinctrl *pinctrl;
+ struct pinctrl_state *pin_default;
+
+ int num_apbs;
+
+ enum svc_wakedetect_state wake_detect_state;
+ int wake_detect_irq;
+ spinlock_t wake_lock; /* Protect wake_detect_state */
+ struct mutex platform_state_mutex; /* Protect state */
+ wait_queue_head_t wq; /* WQ for arche_pdata->state */
+ unsigned long wake_detect_start;
+ struct notifier_block pm_notifier;
+
+ struct device *dev;
+ struct gb_timesync_svc *timesync_svc_pdata;
+};
+
+static int arche_apb_bootret_assert(struct device *dev, void *data)
+{
+ apb_bootret_assert(dev);
+ return 0;
+}
+
+static int arche_apb_bootret_deassert(struct device *dev, void *data)
+{
+ apb_bootret_deassert(dev);
+ return 0;
+}
+
+/* Requires calling context to hold arche_pdata->platform_state_mutex */
+static void arche_platform_set_state(struct arche_platform_drvdata
*arche_pdata,
+ enum arche_platform_state state)
+{
+ arche_pdata->state = state;
+}
+
+/*
+ * arche_platform_change_state: Change the operational state
+ *
+ * This exported function allows external drivers to change the state
+ * of the arche-platform driver.
+ * Note that this function only supports transitions between two states
+ * with limited functionality.
+ *
+ * - ARCHE_PLATFORM_STATE_TIME_SYNC:
+ * Once set, allows timesync operations between SVC <=> AP and makes
+ * sure that arche-platform driver ignores any subsequent events/pulses
+ * from SVC over wake/detect.
+ *
+ * - ARCHE_PLATFORM_STATE_ACTIVE:
+ * Puts back driver to active state, where any pulse from SVC on wake/detect
+ * line would trigger either cold/standby boot.
+ * Note: Transition request from this function does not trigger cold/standby
+ * boot. It just puts back driver book keeping variable back to ACTIVE
+ * state and restores the interrupt.
+ *
+ * Returns -ENODEV if device not found, -EAGAIN if the driver cannot currently
+ * satisfy the requested state-transition or -EINVAL for all other
+ * state-transition requests.
+ */
+int arche_platform_change_state(enum arche_platform_state state,
+ struct gb_timesync_svc *timesync_svc_pdata)
+{
+ struct arche_platform_drvdata *arche_pdata;
+ struct platform_device *pdev;
+ struct device_node *np;
+ int ret = -EAGAIN;
+ unsigned long flags;
+
+ np = of_find_compatible_node(NULL, NULL, "google,arche-platform");
+ if (!np) {
+ pr_err("google,arche-platform device node not found\n");
+ return -ENODEV;
+ }
+
+ pdev = of_find_device_by_node(np);
+ if (!pdev) {
+ pr_err("arche-platform device not found\n");
+ return -ENODEV;
+ }
+
+ arche_pdata = platform_get_drvdata(pdev);
+
+ mutex_lock(&arche_pdata->platform_state_mutex);
+ spin_lock_irqsave(&arche_pdata->wake_lock, flags);
+
+ if (arche_pdata->state == state) {
+ ret = 0;
+ goto exit;
+ }
+
+ switch (state) {
+ case ARCHE_PLATFORM_STATE_TIME_SYNC:
+ if (arche_pdata->state != ARCHE_PLATFORM_STATE_ACTIVE) {
+ ret = -EINVAL;
+ goto exit;
+ }
+ if (arche_pdata->wake_detect_state != WD_STATE_IDLE) {
+ dev_err(arche_pdata->dev,
+ "driver busy with wake/detect line ops\n");
+ goto exit;
+ }
+ device_for_each_child(arche_pdata->dev, NULL,
+ arche_apb_bootret_assert);
+ arche_pdata->wake_detect_state = WD_STATE_TIMESYNC;
+ break;
+ case ARCHE_PLATFORM_STATE_ACTIVE:
+ if (arche_pdata->state != ARCHE_PLATFORM_STATE_TIME_SYNC) {
+ ret = -EINVAL;
+ goto exit;
+ }
+ device_for_each_child(arche_pdata->dev, NULL,
+ arche_apb_bootret_deassert);
+ arche_pdata->wake_detect_state = WD_STATE_IDLE;
+ break;
+ case ARCHE_PLATFORM_STATE_OFF:
+ case ARCHE_PLATFORM_STATE_STANDBY:
+ case ARCHE_PLATFORM_STATE_FW_FLASHING:
+ dev_err(arche_pdata->dev, "busy, request to retry later\n");
+ goto exit;
+ default:
+ ret = -EINVAL;
+ dev_err(arche_pdata->dev,
+ "invalid state transition request\n");
+ goto exit;
+ }
+ arche_pdata->timesync_svc_pdata = timesync_svc_pdata;
+ arche_platform_set_state(arche_pdata, state);
+ if (state == ARCHE_PLATFORM_STATE_ACTIVE)
+ wake_up(&arche_pdata->wq);
+
+ ret = 0;
+exit:
+ spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
+ mutex_unlock(&arche_pdata->platform_state_mutex);
+ of_node_put(np);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(arche_platform_change_state);
+
+/* Requires arche_pdata->wake_lock is held by calling context */
+static void arche_platform_set_wake_detect_state(
+ struct arche_platform_drvdata *arche_pdata,
+ enum svc_wakedetect_state state)
+{
+ arche_pdata->wake_detect_state = state;
+}
+
+static inline void svc_reset_onoff(unsigned int gpio, bool onoff)
+{
+ gpio_set_value(gpio, onoff);
+}
+
+static int apb_cold_boot(struct device *dev, void *data)
+{
+ int ret;
+
+ ret = apb_ctrl_coldboot(dev);
+ if (ret)
+ dev_warn(dev, "failed to coldboot\n");
+
+ /*Child nodes are independent, so do not exit coldboot operation */
+ return 0;
+}
+
+static int apb_poweroff(struct device *dev, void *data)
+{
+ apb_ctrl_poweroff(dev);
+
+ /* Enable HUB3613 into HUB mode. */
+ if (usb3613_hub_mode_ctrl(false))
+ dev_warn(dev, "failed to control hub device\n");
+
+ return 0;
+}
+
+static void arche_platform_wd_irq_en(struct arche_platform_drvdata
*arche_pdata)
+{
+ /* Enable interrupt here, to read event back from SVC */
+ gpio_direction_input(arche_pdata->wake_detect_gpio);
+ enable_irq(arche_pdata->wake_detect_irq);
+}
+
+static irqreturn_t arche_platform_wd_irq_thread(int irq, void *devid)
+{
+ struct arche_platform_drvdata *arche_pdata = devid;
+ unsigned long flags;
+
+ spin_lock_irqsave(&arche_pdata->wake_lock, flags);
+ if (arche_pdata->wake_detect_state != WD_STATE_COLDBOOT_TRIG) {
+ /* Something is wrong */
+ spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
+ return IRQ_HANDLED;
+ }
+
+ arche_platform_set_wake_detect_state(arche_pdata,
+ WD_STATE_COLDBOOT_START);
+ spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
+
+ /* It should complete power cycle, so first make sure it is poweroff */
+ device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
+
+ /* Bring APB out of reset: cold boot sequence */
+ device_for_each_child(arche_pdata->dev, NULL, apb_cold_boot);
+
+ /* Enable HUB3613 into HUB mode. */
+ if (usb3613_hub_mode_ctrl(true))
+ dev_warn(arche_pdata->dev, "failed to control hub device\n");
+
+ spin_lock_irqsave(&arche_pdata->wake_lock, flags);
+ arche_platform_set_wake_detect_state(arche_pdata, WD_STATE_IDLE);
+ spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t arche_platform_wd_irq(int irq, void *devid)
+{
+ struct arche_platform_drvdata *arche_pdata = devid;
+ unsigned long flags;
+
+ spin_lock_irqsave(&arche_pdata->wake_lock, flags);
+
+ if (arche_pdata->wake_detect_state == WD_STATE_TIMESYNC) {
+ gb_timesync_irq(arche_pdata->timesync_svc_pdata);
+ goto exit;
+ }
+
+ if (gpio_get_value(arche_pdata->wake_detect_gpio)) {
+ /* wake/detect rising */
+
+ /*
+ * If wake/detect line goes high after low, within less than
+ * 30msec, then standby boot sequence is initiated, which is not
+ * supported/implemented as of now. So ignore it.
+ */
+ if (arche_pdata->wake_detect_state == WD_STATE_BOOT_INIT) {
+ if (time_before(jiffies,
+ arche_pdata->wake_detect_start +
+
msecs_to_jiffies(WD_COLDBOOT_PULSE_WIDTH_MS))) {
+
arche_platform_set_wake_detect_state(arche_pdata,
+
WD_STATE_IDLE);
+ } else {
+ /* Check we are not in middle of irq thread
already */
+ if (arche_pdata->wake_detect_state !=
+ WD_STATE_COLDBOOT_START) {
+
arche_platform_set_wake_detect_state(arche_pdata,
+
WD_STATE_COLDBOOT_TRIG);
+ spin_unlock_irqrestore(
+ &arche_pdata->wake_lock,
+ flags);
+ return IRQ_WAKE_THREAD;
+ }
+ }
+ }
+ } else {
+ /* wake/detect falling */
+ if (arche_pdata->wake_detect_state == WD_STATE_IDLE) {
+ arche_pdata->wake_detect_start = jiffies;
+ /*
+ * In the begining, when wake/detect goes low (first
time), we assume
+ * it is meant for coldboot and set the flag. If
wake/detect line stays low
+ * beyond 30msec, then it is coldboot else fallback to
standby boot.
+ */
+ arche_platform_set_wake_detect_state(arche_pdata,
+
WD_STATE_BOOT_INIT);
+ }
+ }
+
+exit:
+ spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Requires arche_pdata->platform_state_mutex to be held
+ */
+static int arche_platform_coldboot_seq(struct arche_platform_drvdata
*arche_pdata)
+{
+ int ret;
+
+ if (arche_pdata->state == ARCHE_PLATFORM_STATE_ACTIVE)
+ return 0;
+
+ dev_info(arche_pdata->dev, "Booting from cold boot state\n");
+
+ svc_reset_onoff(arche_pdata->svc_reset_gpio,
+ arche_pdata->is_reset_act_hi);
+
+ gpio_set_value(arche_pdata->svc_sysboot_gpio, 0);
+ usleep_range(100, 200);
+
+ ret = clk_prepare_enable(arche_pdata->svc_ref_clk);
+ if (ret) {
+ dev_err(arche_pdata->dev, "failed to enable svc_ref_clk: %d\n",
+ ret);
+ return ret;
+ }
+
+ /* bring SVC out of reset */
+ svc_reset_onoff(arche_pdata->svc_reset_gpio,
+ !arche_pdata->is_reset_act_hi);
+
+ arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_ACTIVE);
+
+ return 0;
+}
+
+/*
+ * Requires arche_pdata->platform_state_mutex to be held
+ */
+static int arche_platform_fw_flashing_seq(struct arche_platform_drvdata
*arche_pdata)
+{
+ int ret;
+
+ if (arche_pdata->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
+ return 0;
+
+ dev_info(arche_pdata->dev, "Switching to FW flashing state\n");
+
+ svc_reset_onoff(arche_pdata->svc_reset_gpio,
+ arche_pdata->is_reset_act_hi);
+
+ gpio_set_value(arche_pdata->svc_sysboot_gpio, 1);
+
+ usleep_range(100, 200);
+
+ ret = clk_prepare_enable(arche_pdata->svc_ref_clk);
+ if (ret) {
+ dev_err(arche_pdata->dev, "failed to enable svc_ref_clk: %d\n",
+ ret);
+ return ret;
+ }
+
+ svc_reset_onoff(arche_pdata->svc_reset_gpio,
+ !arche_pdata->is_reset_act_hi);
+
+ arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_FW_FLASHING);
+
+ return 0;
+}
+
+/*
+ * Requires arche_pdata->platform_state_mutex to be held
+ */
+static void arche_platform_poweroff_seq(struct arche_platform_drvdata
*arche_pdata)
+{
+ unsigned long flags;
+
+ if (arche_pdata->state == ARCHE_PLATFORM_STATE_OFF)
+ return;
+
+ /* If in fw_flashing mode, then no need to repeate things again */
+ if (arche_pdata->state != ARCHE_PLATFORM_STATE_FW_FLASHING) {
+ disable_irq(arche_pdata->wake_detect_irq);
+
+ spin_lock_irqsave(&arche_pdata->wake_lock, flags);
+ arche_platform_set_wake_detect_state(arche_pdata,
+ WD_STATE_IDLE);
+ spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
+ }
+
+ clk_disable_unprepare(arche_pdata->svc_ref_clk);
+
+ /* As part of exit, put APB back in reset state */
+ svc_reset_onoff(arche_pdata->svc_reset_gpio,
+ arche_pdata->is_reset_act_hi);
+
+ arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_OFF);
+}
+
+static ssize_t state_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct arche_platform_drvdata *arche_pdata = platform_get_drvdata(pdev);
+ int ret = 0;
+
+retry:
+ mutex_lock(&arche_pdata->platform_state_mutex);
+ if (arche_pdata->state == ARCHE_PLATFORM_STATE_TIME_SYNC) {
+ mutex_unlock(&arche_pdata->platform_state_mutex);
+ ret = wait_event_interruptible(
+ arche_pdata->wq,
+ arche_pdata->state != ARCHE_PLATFORM_STATE_TIME_SYNC);
+ if (ret)
+ return ret;
+ goto retry;
+ }
+
+ if (sysfs_streq(buf, "off")) {
+ if (arche_pdata->state == ARCHE_PLATFORM_STATE_OFF)
+ goto exit;
+
+ /* If SVC goes down, bring down APB's as well */
+ device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
+
+ arche_platform_poweroff_seq(arche_pdata);
+
+ } else if (sysfs_streq(buf, "active")) {
+ if (arche_pdata->state == ARCHE_PLATFORM_STATE_ACTIVE)
+ goto exit;
+
+ /* First we want to make sure we power off everything
+ * and then activate back again */
+ device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
+ arche_platform_poweroff_seq(arche_pdata);
+
+ arche_platform_wd_irq_en(arche_pdata);
+ ret = arche_platform_coldboot_seq(arche_pdata);
+ if (ret)
+ goto exit;
+
+ } else if (sysfs_streq(buf, "standby")) {
+ if (arche_pdata->state == ARCHE_PLATFORM_STATE_STANDBY)
+ goto exit;
+
+ dev_warn(arche_pdata->dev, "standby state not supported\n");
+ } else if (sysfs_streq(buf, "fw_flashing")) {
+ if (arche_pdata->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
+ goto exit;
+
+ /*
+ * Here we only control SVC.
+ *
+ * In case of FW_FLASHING mode we do not want to control
+ * APBs, as in case of V2, SPI bus is shared between both
+ * the APBs. So let user chose which APB he wants to flash.
+ */
+ arche_platform_poweroff_seq(arche_pdata);
+
+ ret = arche_platform_fw_flashing_seq(arche_pdata);
+ if (ret)
+ goto exit;
+ } else {
+ dev_err(arche_pdata->dev, "unknown state\n");
+ ret = -EINVAL;
+ }
+
+exit:
+ mutex_unlock(&arche_pdata->platform_state_mutex);
+ return ret ? ret : count;
+}
+
+static ssize_t state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct arche_platform_drvdata *arche_pdata = dev_get_drvdata(dev);
+
+ switch (arche_pdata->state) {
+ case ARCHE_PLATFORM_STATE_OFF:
+ return sprintf(buf, "off\n");
+ case ARCHE_PLATFORM_STATE_ACTIVE:
+ return sprintf(buf, "active\n");
+ case ARCHE_PLATFORM_STATE_STANDBY:
+ return sprintf(buf, "standby\n");
+ case ARCHE_PLATFORM_STATE_FW_FLASHING:
+ return sprintf(buf, "fw_flashing\n");
+ case ARCHE_PLATFORM_STATE_TIME_SYNC:
+ return sprintf(buf, "time_sync\n");
+ default:
+ return sprintf(buf, "unknown state\n");
+ }
+}
+
+static DEVICE_ATTR_RW(state);
+
+static int arche_platform_pm_notifier(struct notifier_block *notifier,
+ unsigned long pm_event, void *unused)
+{
+ struct arche_platform_drvdata *arche_pdata =
+ container_of(notifier, struct arche_platform_drvdata,
+ pm_notifier);
+ int ret = NOTIFY_DONE;
+
+ mutex_lock(&arche_pdata->platform_state_mutex);
+ switch (pm_event) {
+ case PM_SUSPEND_PREPARE:
+ if (arche_pdata->state != ARCHE_PLATFORM_STATE_ACTIVE) {
+ ret = NOTIFY_STOP;
+ break;
+ }
+ device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
+ arche_platform_poweroff_seq(arche_pdata);
+ break;
+ case PM_POST_SUSPEND:
+ if (arche_pdata->state != ARCHE_PLATFORM_STATE_OFF)
+ break;
+
+ arche_platform_wd_irq_en(arche_pdata);
+ arche_platform_coldboot_seq(arche_pdata);
+ break;
+ default:
+ break;
+ }
+ mutex_unlock(&arche_pdata->platform_state_mutex);
+
+ return ret;
+}
+
+static int arche_platform_probe(struct platform_device *pdev)
+{
+ struct arche_platform_drvdata *arche_pdata;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ int ret;
+
+ arche_pdata = devm_kzalloc(&pdev->dev, sizeof(*arche_pdata),
GFP_KERNEL);
+ if (!arche_pdata)
+ return -ENOMEM;
+
+ /* setup svc reset gpio */
+ arche_pdata->is_reset_act_hi = of_property_read_bool(np,
+ "svc,reset-active-high");
+ arche_pdata->svc_reset_gpio = of_get_named_gpio(np, "svc,reset-gpio",
0);
+ if (arche_pdata->svc_reset_gpio < 0) {
+ dev_err(dev, "failed to get reset-gpio\n");
+ return arche_pdata->svc_reset_gpio;
+ }
+ ret = devm_gpio_request(dev, arche_pdata->svc_reset_gpio, "svc-reset");
+ if (ret) {
+ dev_err(dev, "failed to request svc-reset gpio:%d\n", ret);
+ return ret;
+ }
+ ret = gpio_direction_output(arche_pdata->svc_reset_gpio,
+ arche_pdata->is_reset_act_hi);
+ if (ret) {
+ dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
+ return ret;
+ }
+ arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_OFF);
+
+ arche_pdata->svc_sysboot_gpio = of_get_named_gpio(np,
+ "svc,sysboot-gpio", 0);
+ if (arche_pdata->svc_sysboot_gpio < 0) {
+ dev_err(dev, "failed to get sysboot gpio\n");
+ return arche_pdata->svc_sysboot_gpio;
+ }
+ ret = devm_gpio_request(dev, arche_pdata->svc_sysboot_gpio, "sysboot0");
+ if (ret) {
+ dev_err(dev, "failed to request sysboot0 gpio:%d\n", ret);
+ return ret;
+ }
+ ret = gpio_direction_output(arche_pdata->svc_sysboot_gpio, 0);
+ if (ret) {
+ dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
+ return ret;
+ }
+
+ /* setup the clock request gpio first */
+ arche_pdata->svc_refclk_req = of_get_named_gpio(np,
+ "svc,refclk-req-gpio", 0);
+ if (arche_pdata->svc_refclk_req < 0) {
+ dev_err(dev, "failed to get svc clock-req gpio\n");
+ return arche_pdata->svc_refclk_req;
+ }
+ ret = devm_gpio_request(dev, arche_pdata->svc_refclk_req,
"svc-clk-req");
+ if (ret) {
+ dev_err(dev, "failed to request svc-clk-req gpio: %d\n", ret);
+ return ret;
+ }
+ ret = gpio_direction_input(arche_pdata->svc_refclk_req);
+ if (ret) {
+ dev_err(dev, "failed to set svc-clk-req gpio dir :%d\n", ret);
+ return ret;
+ }
+
+ /* setup refclk2 to follow the pin */
+ arche_pdata->svc_ref_clk = devm_clk_get(dev, "svc_ref_clk");
+ if (IS_ERR(arche_pdata->svc_ref_clk)) {
+ ret = PTR_ERR(arche_pdata->svc_ref_clk);
+ dev_err(dev, "failed to get svc_ref_clk: %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, arche_pdata);
+
+ arche_pdata->num_apbs = of_get_child_count(np);
+ dev_dbg(dev, "Number of APB's available - %d\n", arche_pdata->num_apbs);
+
+ arche_pdata->wake_detect_gpio = of_get_named_gpio(np,
"svc,wake-detect-gpio", 0);
+ if (arche_pdata->wake_detect_gpio < 0) {
+ dev_err(dev, "failed to get wake detect gpio\n");
+ ret = arche_pdata->wake_detect_gpio;
+ return ret;
+ }
+
+ ret = devm_gpio_request(dev, arche_pdata->wake_detect_gpio, "wake
detect");
+ if (ret) {
+ dev_err(dev, "Failed requesting wake_detect gpio %d\n",
+ arche_pdata->wake_detect_gpio);
+ return ret;
+ }
+
+ arche_platform_set_wake_detect_state(arche_pdata, WD_STATE_IDLE);
+
+ arche_pdata->dev = &pdev->dev;
+
+ spin_lock_init(&arche_pdata->wake_lock);
+ mutex_init(&arche_pdata->platform_state_mutex);
+ init_waitqueue_head(&arche_pdata->wq);
+ arche_pdata->wake_detect_irq =
+ gpio_to_irq(arche_pdata->wake_detect_gpio);
+
+ ret = devm_request_threaded_irq(dev, arche_pdata->wake_detect_irq,
+ arche_platform_wd_irq,
+ arche_platform_wd_irq_thread,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
IRQF_ONESHOT,
+ dev_name(dev), arche_pdata);
+ if (ret) {
+ dev_err(dev, "failed to request wake detect IRQ %d\n", ret);
+ return ret;
+ }
+ disable_irq(arche_pdata->wake_detect_irq);
+
+ ret = device_create_file(dev, &dev_attr_state);
+ if (ret) {
+ dev_err(dev, "failed to create state file in sysfs\n");
+ return ret;
+ }
+
+ ret = of_platform_populate(np, NULL, NULL, dev);
+ if (ret) {
+ dev_err(dev, "failed to populate child nodes %d\n", ret);
+ goto err_device_remove;
+ }
+
+ arche_pdata->pm_notifier.notifier_call = arche_platform_pm_notifier;
+ ret = register_pm_notifier(&arche_pdata->pm_notifier);
+
+ if (ret) {
+ dev_err(dev, "failed to register pm notifier %d\n", ret);
+ goto err_device_remove;
+ }
+
+ /* Register callback pointer */
+ arche_platform_change_state_cb = arche_platform_change_state;
+
+ /* Explicitly power off if requested */
+ if (!of_property_read_bool(pdev->dev.of_node, "arche,init-off")) {
+ mutex_lock(&arche_pdata->platform_state_mutex);
+ ret = arche_platform_coldboot_seq(arche_pdata);
+ if (ret) {
+ dev_err(dev, "Failed to cold boot svc %d\n", ret);
+ goto err_coldboot;
+ }
+ arche_platform_wd_irq_en(arche_pdata);
+ mutex_unlock(&arche_pdata->platform_state_mutex);
+ }
+
+ dev_info(dev, "Device registered successfully\n");
+ return 0;
+
+err_coldboot:
+ mutex_unlock(&arche_pdata->platform_state_mutex);
+err_device_remove:
+ device_remove_file(&pdev->dev, &dev_attr_state);
+ return ret;
+}
+
+static int arche_remove_child(struct device *dev, void *unused)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ platform_device_unregister(pdev);
+
+ return 0;
+}
+
+static int arche_platform_remove(struct platform_device *pdev)
+{
+ struct arche_platform_drvdata *arche_pdata = platform_get_drvdata(pdev);
+
+ unregister_pm_notifier(&arche_pdata->pm_notifier);
+ device_remove_file(&pdev->dev, &dev_attr_state);
+ device_for_each_child(&pdev->dev, NULL, arche_remove_child);
+ arche_platform_poweroff_seq(arche_pdata);
+ platform_set_drvdata(pdev, NULL);
+
+ if (usb3613_hub_mode_ctrl(false))
+ dev_warn(arche_pdata->dev, "failed to control hub device\n");
+ /* TODO: Should we do anything more here ?? */
+ return 0;
+}
+
+static int arche_platform_suspend(struct device *dev)
+{
+ /*
+ * If timing profile premits, we may shutdown bridge
+ * completely
+ *
+ * TODO: sequence ??
+ *
+ * Also, need to make sure we meet precondition for unipro suspend
+ * Precondition: Definition ???
+ */
+ return 0;
+}
+
+static int arche_platform_resume(struct device *dev)
+{
+ /*
+ * Atleast for ES2 we have to meet the delay requirement between
+ * unipro switch and AP bridge init, depending on whether bridge is in
+ * OFF state or standby state.
+ *
+ * Based on whether bridge is in standby or OFF state we may have to
+ * assert multiple signals. Please refer to WDM spec, for more info.
+ *
+ */
+ return 0;
+}
+
+static void arche_platform_shutdown(struct platform_device *pdev)
+{
+ struct arche_platform_drvdata *arche_pdata = platform_get_drvdata(pdev);
+
+ arche_platform_poweroff_seq(arche_pdata);
+
+ usb3613_hub_mode_ctrl(false);
+}
+
+static SIMPLE_DEV_PM_OPS(arche_platform_pm_ops,
+ arche_platform_suspend,
+ arche_platform_resume);
+
+static struct of_device_id arche_platform_of_match[] = {
+ { .compatible = "google,arche-platform", }, /* Use PID/VID of SVC
device */
+ { },
+};
+
+static struct of_device_id arche_combined_id[] = {
+ { .compatible = "google,arche-platform", }, /* Use PID/VID of SVC
device */
+ { .compatible = "usbffff,2", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, arche_combined_id);
+
+static struct platform_driver arche_platform_device_driver = {
+ .probe = arche_platform_probe,
+ .remove = arche_platform_remove,
+ .shutdown = arche_platform_shutdown,
+ .driver = {
+ .name = "arche-platform-ctrl",
+ .pm = &arche_platform_pm_ops,
+ .of_match_table = arche_platform_of_match,
+ }
+};
+
+static int __init arche_init(void)
+{
+ int retval;
+
+ retval = platform_driver_register(&arche_platform_device_driver);
+ if (retval)
+ return retval;
+
+ retval = arche_apb_init();
+ if (retval)
+ platform_driver_unregister(&arche_platform_device_driver);
+
+ return retval;
+}
+module_init(arche_init);
+
+static void __exit arche_exit(void)
+{
+ arche_apb_exit();
+ platform_driver_unregister(&arche_platform_device_driver);
+}
+module_exit(arche_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Vaibhav Hiremath <vaibhav.hirem...@linaro.org>");
+MODULE_DESCRIPTION("Arche Platform Driver");
--- /dev/null
+++ b/drivers/greybus/arche_platform.h
@@ -0,0 +1,39 @@
+/*
+ * Arche Platform driver to enable Unipro link.
+ *
+ * Copyright 2015-2016 Google Inc.
+ * Copyright 2015-2016 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __ARCHE_PLATFORM_H
+#define __ARCHE_PLATFORM_H
+
+#include "timesync.h"
+
+enum arche_platform_state {
+ ARCHE_PLATFORM_STATE_OFF,
+ ARCHE_PLATFORM_STATE_ACTIVE,
+ ARCHE_PLATFORM_STATE_STANDBY,
+ ARCHE_PLATFORM_STATE_FW_FLASHING,
+ ARCHE_PLATFORM_STATE_TIME_SYNC,
+};
+
+int arche_platform_change_state(enum arche_platform_state state,
+ struct gb_timesync_svc *pdata);
+
+extern int (*arche_platform_change_state_cb)(enum arche_platform_state state,
+ struct gb_timesync_svc *pdata);
+int __init arche_apb_init(void);
+void __exit arche_apb_exit(void);
+
+/* Operational states for the APB device */
+int apb_ctrl_coldboot(struct device *dev);
+int apb_ctrl_fw_flashing(struct device *dev);
+int apb_ctrl_standby_boot(struct device *dev);
+void apb_ctrl_poweroff(struct device *dev);
+void apb_bootret_assert(struct device *dev);
+void apb_bootret_deassert(struct device *dev);
+
+#endif /* __ARCHE_PLATFORM_H */
