mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-13 06:08:07 +00:00
f760bbfb5c
This patch enabled interrupt support on events received over wake/detect line. The driver follows below state machine, Default: wake/detect line is high (WD_STATE_IDLE) On Falling edge: SVC initiates boot (either cold/standby). On ES3, > 30msec = coldboot, else standby boot. Driver moves to WD_STATE_BOOT_INIT On rising edge (> 30msec): SVC expects APB to coldboot Driver wakes irq thread which kicks off APB coldboot (WD_STATE_COLDBOOT_TRIG) On rising edge (< 30msec): Driver ignores it, do nothing. After coldboot of APB, HUB configuration work is scheduled after 2 sec, allowing enough time for APB<->SVC/Switch to linkup (in multiple iterations) Testing Done: Tested on DB3.5 platform. Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org> Reviewed-by: Michael Scott <michael.scott@linaro.org> Tested-by: Michael Scott <michael.scott@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
616 lines
17 KiB
C
616 lines
17 KiB
C
/*
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* Arche Platform driver to enable Unipro link.
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*
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* Copyright 2014-2015 Google Inc.
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* Copyright 2014-2015 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/of_platform.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/time.h>
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#include "arche_platform.h"
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#include <linux/usb/usb3613.h>
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#define WD_COLDBOOT_PULSE_WIDTH_MS 30
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enum svc_wakedetect_state {
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WD_STATE_IDLE, /* Default state = pulled high/low */
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WD_STATE_BOOT_INIT, /* WD = falling edge (low) */
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WD_STATE_COLDBOOT_TRIG, /* WD = rising edge (high), > 30msec */
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WD_STATE_STANDBYBOOT_TRIG, /* As of now not used ?? */
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WD_STATE_COLDBOOT_START, /* Cold boot process started */
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WD_STATE_STANDBYBOOT_START, /* Not used */
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};
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struct arche_platform_drvdata {
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/* Control GPIO signals to and from AP <=> SVC */
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int svc_reset_gpio;
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bool is_reset_act_hi;
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int svc_sysboot_gpio;
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int wake_detect_gpio; /* bi-dir,maps to WAKE_MOD & WAKE_FRAME signals */
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enum arche_platform_state state;
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unsigned int svc_refclk_req;
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struct clk *svc_ref_clk;
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struct pinctrl *pinctrl;
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struct pinctrl_state *pin_default;
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int num_apbs;
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struct delayed_work delayed_work;
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enum svc_wakedetect_state wake_detect_state;
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int wake_detect_irq;
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spinlock_t lock;
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unsigned long wake_detect_start;
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struct device *dev;
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};
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static inline void svc_reset_onoff(unsigned int gpio, bool onoff)
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{
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gpio_set_value(gpio, onoff);
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}
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static int apb_cold_boot(struct device *dev, void *data)
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{
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int ret;
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ret = apb_ctrl_coldboot(dev);
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if (ret)
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dev_warn(dev, "failed to coldboot\n");
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/*Child nodes are independent, so do not exit coldboot operation */
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return 0;
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}
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static int apb_fw_flashing_state(struct device *dev, void *data)
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{
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int ret;
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ret = apb_ctrl_fw_flashing(dev);
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if (ret)
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dev_warn(dev, "failed to switch to fw flashing state\n");
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/*Child nodes are independent, so do not exit coldboot operation */
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return 0;
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}
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static int apb_poweroff(struct device *dev, void *data)
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{
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apb_ctrl_poweroff(dev);
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return 0;
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}
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/**
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* hub_conf_delayed_work - Configures USB3613 device to HUB mode
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*
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* The idea here is to split the APB coldboot operation with slow HUB configuration,
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* so that driver response to wake/detect event can be met.
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* So expectation is, once code reaches here, means initial unipro linkup
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* between APB<->Switch was successful, so now just take it to AP.
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*/
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static void hub_conf_delayed_work(struct work_struct *work)
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{
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struct arche_platform_drvdata *arche_pdata =
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container_of(work, struct arche_platform_drvdata, delayed_work.work);
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/* Enable HUB3613 into HUB mode. */
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if (usb3613_hub_mode_ctrl(true))
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dev_warn(arche_pdata->dev, "failed to control hub device\n");
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}
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static irqreturn_t arche_platform_wd_irq_thread(int irq, void *devid)
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{
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struct arche_platform_drvdata *arche_pdata = devid;
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unsigned long flags;
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spin_lock_irqsave(&arche_pdata->lock, flags);
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if (arche_pdata->wake_detect_state != WD_STATE_COLDBOOT_TRIG) {
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/* Something is wrong */
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spin_unlock_irqrestore(&arche_pdata->lock, flags);
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return IRQ_HANDLED;
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}
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arche_pdata->wake_detect_state = WD_STATE_COLDBOOT_START;
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spin_unlock_irqrestore(&arche_pdata->lock, flags);
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/* Bring APB out of reset: cold boot sequence */
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device_for_each_child(arche_pdata->dev, NULL, apb_cold_boot);
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spin_lock_irqsave(&arche_pdata->lock, flags);
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/* USB HUB configuration */
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schedule_delayed_work(&arche_pdata->delayed_work, msecs_to_jiffies(2000));
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arche_pdata->wake_detect_state = WD_STATE_IDLE;
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spin_unlock_irqrestore(&arche_pdata->lock, flags);
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return IRQ_HANDLED;
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}
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static irqreturn_t arche_platform_wd_irq(int irq, void *devid)
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{
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struct arche_platform_drvdata *arche_pdata = devid;
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unsigned long flags;
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spin_lock_irqsave(&arche_pdata->lock, flags);
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if (gpio_get_value(arche_pdata->wake_detect_gpio)) {
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/* wake/detect rising */
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/*
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* If wake/detect line goes high after low, within less than
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* 30msec, then standby boot sequence is initiated, which is not
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* supported/implemented as of now. So ignore it.
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*/
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if (arche_pdata->wake_detect_state == WD_STATE_BOOT_INIT) {
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if (time_before(jiffies,
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arche_pdata->wake_detect_start +
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msecs_to_jiffies(WD_COLDBOOT_PULSE_WIDTH_MS))) {
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/* No harm with cancellation, even if not pending */
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cancel_delayed_work(&arche_pdata->delayed_work);
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arche_pdata->wake_detect_state = WD_STATE_IDLE;
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} else {
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/* Check we are not in middle of irq thread already */
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if (arche_pdata->wake_detect_state !=
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WD_STATE_COLDBOOT_START) {
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arche_pdata->wake_detect_state =
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WD_STATE_COLDBOOT_TRIG;
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spin_unlock_irqrestore(&arche_pdata->lock, flags);
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return IRQ_WAKE_THREAD;
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}
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}
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}
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} else {
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/* wake/detect falling */
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if (arche_pdata->wake_detect_state == WD_STATE_IDLE) {
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arche_pdata->wake_detect_start = jiffies;
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/* No harm with cancellation even if it is not pending*/
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cancel_delayed_work(&arche_pdata->delayed_work);
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/*
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* In the begining, when wake/detect goes low (first time), we assume
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* it is meant for coldboot and set the flag. If wake/detect line stays low
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* beyond 30msec, then it is coldboot else fallback to standby boot.
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*/
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arche_pdata->wake_detect_state = WD_STATE_BOOT_INIT;
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}
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}
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spin_unlock_irqrestore(&arche_pdata->lock, flags);
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return IRQ_HANDLED;
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}
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static int arche_platform_coldboot_seq(struct arche_platform_drvdata *arche_pdata)
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{
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int ret;
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if (arche_pdata->state == ARCHE_PLATFORM_STATE_ACTIVE)
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return 0;
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dev_info(arche_pdata->dev, "Booting from cold boot state\n");
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svc_reset_onoff(arche_pdata->svc_reset_gpio,
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arche_pdata->is_reset_act_hi);
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gpio_set_value(arche_pdata->svc_sysboot_gpio, 0);
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usleep_range(100, 200);
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ret = clk_prepare_enable(arche_pdata->svc_ref_clk);
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if (ret) {
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dev_err(arche_pdata->dev, "failed to enable svc_ref_clk: %d\n",
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ret);
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return ret;
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}
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/* bring SVC out of reset */
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svc_reset_onoff(arche_pdata->svc_reset_gpio,
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!arche_pdata->is_reset_act_hi);
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arche_pdata->state = ARCHE_PLATFORM_STATE_ACTIVE;
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return 0;
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}
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static void arche_platform_fw_flashing_seq(struct arche_platform_drvdata *arche_pdata)
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{
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if (arche_pdata->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
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return;
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dev_info(arche_pdata->dev, "Switching to FW flashing state\n");
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svc_reset_onoff(arche_pdata->svc_reset_gpio,
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arche_pdata->is_reset_act_hi);
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gpio_set_value(arche_pdata->svc_sysboot_gpio, 1);
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usleep_range(100, 200);
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svc_reset_onoff(arche_pdata->svc_reset_gpio,
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!arche_pdata->is_reset_act_hi);
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arche_pdata->state = ARCHE_PLATFORM_STATE_FW_FLASHING;
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}
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static void arche_platform_poweroff_seq(struct arche_platform_drvdata *arche_pdata)
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{
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unsigned long flags;
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if (arche_pdata->state == ARCHE_PLATFORM_STATE_OFF)
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return;
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/* If in fw_flashing mode, then no need to repeate things again */
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if (arche_pdata->state != ARCHE_PLATFORM_STATE_FW_FLASHING) {
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/* Send disconnect/detach event to SVC */
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gpio_set_value(arche_pdata->wake_detect_gpio, 0);
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usleep_range(100, 200);
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spin_lock_irqsave(&arche_pdata->lock, flags);
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arche_pdata->wake_detect_state = WD_STATE_IDLE;
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spin_unlock_irqrestore(&arche_pdata->lock, flags);
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clk_disable_unprepare(arche_pdata->svc_ref_clk);
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}
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/* As part of exit, put APB back in reset state */
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svc_reset_onoff(arche_pdata->svc_reset_gpio,
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arche_pdata->is_reset_act_hi);
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arche_pdata->state = ARCHE_PLATFORM_STATE_OFF;
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}
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static ssize_t state_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct arche_platform_drvdata *arche_pdata = platform_get_drvdata(pdev);
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int ret = 0;
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if (sysfs_streq(buf, "off")) {
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if (arche_pdata->state == ARCHE_PLATFORM_STATE_OFF)
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return count;
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/* If SVC goes down, bring down APB's as well */
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device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
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arche_platform_poweroff_seq(arche_pdata);
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ret = usb3613_hub_mode_ctrl(false);
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if (ret)
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dev_warn(arche_pdata->dev, "failed to control hub device\n");
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/* TODO: Should we do anything more here ?? */
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} else if (sysfs_streq(buf, "active")) {
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if (arche_pdata->state == ARCHE_PLATFORM_STATE_ACTIVE)
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return count;
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ret = arche_platform_coldboot_seq(arche_pdata);
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} else if (sysfs_streq(buf, "standby")) {
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if (arche_pdata->state == ARCHE_PLATFORM_STATE_STANDBY)
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return count;
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dev_warn(arche_pdata->dev, "standby state not supported\n");
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} else if (sysfs_streq(buf, "fw_flashing")) {
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if (arche_pdata->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
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return count;
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/* First we want to make sure we power off everything
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* and then enter FW flashing state */
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device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
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arche_platform_poweroff_seq(arche_pdata);
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ret = usb3613_hub_mode_ctrl(false);
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if (ret)
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dev_warn(arche_pdata->dev, "failed to control hub device\n");
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/* TODO: Should we do anything more here ?? */
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arche_platform_fw_flashing_seq(arche_pdata);
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device_for_each_child(arche_pdata->dev, NULL, apb_fw_flashing_state);
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} else {
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dev_err(arche_pdata->dev, "unknown state\n");
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ret = -EINVAL;
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}
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return ret ? ret : count;
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}
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static ssize_t state_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct arche_platform_drvdata *arche_pdata = dev_get_drvdata(dev);
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switch (arche_pdata->state) {
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case ARCHE_PLATFORM_STATE_OFF:
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return sprintf(buf, "off\n");
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case ARCHE_PLATFORM_STATE_ACTIVE:
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return sprintf(buf, "active\n");
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case ARCHE_PLATFORM_STATE_STANDBY:
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return sprintf(buf, "standby\n");
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case ARCHE_PLATFORM_STATE_FW_FLASHING:
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return sprintf(buf, "fw_flashing\n");
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default:
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return sprintf(buf, "unknown state\n");
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}
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}
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static DEVICE_ATTR_RW(state);
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static int arche_platform_probe(struct platform_device *pdev)
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{
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struct arche_platform_drvdata *arche_pdata;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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int ret;
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arche_pdata = devm_kzalloc(&pdev->dev, sizeof(*arche_pdata), GFP_KERNEL);
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if (!arche_pdata)
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return -ENOMEM;
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/* setup svc reset gpio */
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arche_pdata->is_reset_act_hi = of_property_read_bool(np,
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"svc,reset-active-high");
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arche_pdata->svc_reset_gpio = of_get_named_gpio(np, "svc,reset-gpio", 0);
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if (arche_pdata->svc_reset_gpio < 0) {
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dev_err(dev, "failed to get reset-gpio\n");
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return arche_pdata->svc_reset_gpio;
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}
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ret = devm_gpio_request(dev, arche_pdata->svc_reset_gpio, "svc-reset");
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if (ret) {
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dev_err(dev, "failed to request svc-reset gpio:%d\n", ret);
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return ret;
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}
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ret = gpio_direction_output(arche_pdata->svc_reset_gpio,
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arche_pdata->is_reset_act_hi);
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if (ret) {
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dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
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return ret;
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}
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arche_pdata->state = ARCHE_PLATFORM_STATE_OFF;
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arche_pdata->svc_sysboot_gpio = of_get_named_gpio(np,
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"svc,sysboot-gpio", 0);
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if (arche_pdata->svc_sysboot_gpio < 0) {
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dev_err(dev, "failed to get sysboot gpio\n");
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return arche_pdata->svc_sysboot_gpio;
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}
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ret = devm_gpio_request(dev, arche_pdata->svc_sysboot_gpio, "sysboot0");
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if (ret) {
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dev_err(dev, "failed to request sysboot0 gpio:%d\n", ret);
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return ret;
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}
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ret = gpio_direction_output(arche_pdata->svc_sysboot_gpio, 0);
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if (ret) {
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dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
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return ret;
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}
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/* setup the clock request gpio first */
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arche_pdata->svc_refclk_req = of_get_named_gpio(np,
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"svc,refclk-req-gpio", 0);
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if (arche_pdata->svc_refclk_req < 0) {
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dev_err(dev, "failed to get svc clock-req gpio\n");
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return arche_pdata->svc_refclk_req;
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}
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ret = devm_gpio_request(dev, arche_pdata->svc_refclk_req, "svc-clk-req");
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if (ret) {
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dev_err(dev, "failed to request svc-clk-req gpio: %d\n", ret);
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return ret;
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}
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ret = gpio_direction_input(arche_pdata->svc_refclk_req);
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if (ret) {
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dev_err(dev, "failed to set svc-clk-req gpio dir :%d\n", ret);
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return ret;
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}
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/* setup refclk2 to follow the pin */
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arche_pdata->svc_ref_clk = devm_clk_get(dev, "svc_ref_clk");
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if (IS_ERR(arche_pdata->svc_ref_clk)) {
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ret = PTR_ERR(arche_pdata->svc_ref_clk);
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dev_err(dev, "failed to get svc_ref_clk: %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, arche_pdata);
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arche_pdata->num_apbs = of_get_child_count(np);
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dev_dbg(dev, "Number of APB's available - %d\n", arche_pdata->num_apbs);
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arche_pdata->wake_detect_gpio = of_get_named_gpio(np, "svc,wake-detect-gpio", 0);
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if (arche_pdata->wake_detect_gpio < 0) {
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dev_err(dev, "failed to get wake detect gpio\n");
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ret = arche_pdata->wake_detect_gpio;
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return ret;
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}
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ret = devm_gpio_request(dev, arche_pdata->wake_detect_gpio, "wake detect");
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if (ret) {
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dev_err(dev, "Failed requesting wake_detect gpio %d\n",
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arche_pdata->wake_detect_gpio);
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return ret;
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}
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/* deassert wake detect */
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gpio_direction_output(arche_pdata->wake_detect_gpio, 0);
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arche_pdata->wake_detect_state = WD_STATE_IDLE;
|
|
|
|
arche_pdata->dev = &pdev->dev;
|
|
|
|
spin_lock_init(&arche_pdata->lock);
|
|
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;
|
|
}
|
|
/* Enable it only after sending wake/detect event */
|
|
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 = arche_platform_coldboot_seq(arche_pdata);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to cold boot svc %d\n", ret);
|
|
goto err_coldboot;
|
|
}
|
|
|
|
ret = of_platform_populate(np, NULL, NULL, dev);
|
|
if (ret) {
|
|
dev_err(dev, "failed to populate child nodes %d\n", ret);
|
|
goto err_populate;
|
|
}
|
|
|
|
INIT_DELAYED_WORK(&arche_pdata->delayed_work, hub_conf_delayed_work);
|
|
|
|
dev_info(dev, "Device registered successfully\n");
|
|
return 0;
|
|
|
|
err_populate:
|
|
arche_platform_poweroff_seq(arche_pdata);
|
|
err_coldboot:
|
|
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);
|
|
|
|
device_remove_file(&pdev->dev, &dev_attr_state);
|
|
cancel_delayed_work_sync(&arche_pdata->delayed_work);
|
|
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 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_apb_ctrl_of_match[] = {
|
|
{ .compatible = "usbffff,2", },
|
|
{ },
|
|
};
|
|
|
|
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,
|
|
.driver = {
|
|
.name = "arche-platform-ctrl",
|
|
.pm = &arche_platform_pm_ops,
|
|
.of_match_table = arche_platform_of_match,
|
|
}
|
|
};
|
|
|
|
static struct platform_driver arche_apb_ctrl_device_driver = {
|
|
.probe = arche_apb_ctrl_probe,
|
|
.remove = arche_apb_ctrl_remove,
|
|
.driver = {
|
|
.name = "arche-apb-ctrl",
|
|
.pm = &arche_apb_ctrl_pm_ops,
|
|
.of_match_table = arche_apb_ctrl_of_match,
|
|
}
|
|
};
|
|
|
|
static int __init arche_init(void)
|
|
{
|
|
int retval;
|
|
|
|
retval = platform_driver_register(&arche_platform_device_driver);
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = platform_driver_register(&arche_apb_ctrl_device_driver);
|
|
if (retval)
|
|
platform_driver_unregister(&arche_platform_device_driver);
|
|
|
|
return retval;
|
|
}
|
|
module_init(arche_init);
|
|
|
|
static void __exit arche_exit(void)
|
|
{
|
|
platform_driver_unregister(&arche_apb_ctrl_device_driver);
|
|
platform_driver_unregister(&arche_platform_device_driver);
|
|
}
|
|
module_exit(arche_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Vaibhav Hiremath <vaibhav.hiremath@linaro.org>");
|
|
MODULE_DESCRIPTION("Arche Platform Driver");
|