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/*
* 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 "arche_platform.h"
#include <linux/usb/usb3613.h>
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;
unsigned int svc_refclk_req;
struct clk *svc_ref_clk;
struct pinctrl *pinctrl;
struct pinctrl_state *pin_default;
int num_apbs;
struct delayed_work delayed_work;
struct device *dev;
};
static inline void svc_reset_onoff(unsigned int gpio, bool onoff)
{
gpio_set_value(gpio, onoff);
}
static int apb_fw_flashing_state(struct device *dev, void *data)
{
int ret;
ret = apb_ctrl_fw_flashing(dev);
if (ret)
dev_warn(dev, "failed to switch to fw flashing state\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);
return 0;
}
/**
* hub_conf_delayed_work - Configures USB3613 device to HUB mode
*
* The idea here is to split the APB coldboot operation with slow HUB configuration,
* so that driver response to wake/detect event can be met.
* So expectation is, once code reaches here, means initial unipro linkup
* between APB<->Switch was successful, so now just take it to AP.
*/
static void hub_conf_delayed_work(struct work_struct *work)
{
struct arche_platform_drvdata *arche_pdata =
container_of(work, struct arche_platform_drvdata, delayed_work.work);
/* Enable HUB3613 into HUB mode. */
if (usb3613_hub_mode_ctrl(true))
dev_warn(arche_pdata->dev, "failed to control hub device\n");
}
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_pdata->state = ARCHE_PLATFORM_STATE_ACTIVE;
return 0;
}
static void arche_platform_fw_flashing_seq(struct arche_platform_drvdata *arche_pdata)
{
if (arche_pdata->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
return;
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);
svc_reset_onoff(arche_pdata->svc_reset_gpio,
!arche_pdata->is_reset_act_hi);
arche_pdata->state = ARCHE_PLATFORM_STATE_FW_FLASHING;
}
static void arche_platform_poweroff_seq(struct arche_platform_drvdata *arche_pdata)
{
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) {
/* Send disconnect/detach event to SVC */
gpio_set_value(arche_pdata->wake_detect_gpio, 0);
usleep_range(100, 200);
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_pdata->state = 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;
if (sysfs_streq(buf, "off")) {
if (arche_pdata->state == ARCHE_PLATFORM_STATE_OFF)
return count;
/* 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);
ret = usb3613_hub_mode_ctrl(false);
if (ret)
dev_warn(arche_pdata->dev, "failed to control hub device\n");
/* TODO: Should we do anything more here ?? */
} else if (sysfs_streq(buf, "active")) {
if (arche_pdata->state == ARCHE_PLATFORM_STATE_ACTIVE)
return count;
ret = arche_platform_coldboot_seq(arche_pdata);
} else if (sysfs_streq(buf, "standby")) {
if (arche_pdata->state == ARCHE_PLATFORM_STATE_STANDBY)
return count;
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)
return count;
/* First we want to make sure we power off everything
* and then enter FW flashing state */
device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
arche_platform_poweroff_seq(arche_pdata);
ret = usb3613_hub_mode_ctrl(false);
if (ret)
dev_warn(arche_pdata->dev, "failed to control hub device\n");
/* TODO: Should we do anything more here ?? */
arche_platform_fw_flashing_seq(arche_pdata);
device_for_each_child(arche_pdata->dev, NULL, apb_fw_flashing_state);
} else {
dev_err(arche_pdata->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_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");
default:
return sprintf(buf, "unknown state\n");
}
}
static DEVICE_ATTR_RW(state);
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)
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