select GENERIC_PHY
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Enable this to support the transceiver that is part of Allwinner
diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index 91c5be4..b45d707 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -1,7 +1,7 @@
/*
* Allwinner sun4i USB phy driver
*
- * Copyright (C) 2014 Hans de Goede <hdegoede@xxxxxxxxxx>
+ * Copyright (C) 2014-2015 Hans de Goede <hdegoede@xxxxxxxxxx>
*
* Based on code from
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
@@ -23,17 +23,23 @@
#include <linux/clk.h>
#include <linux/err.h>
+#include <linux/extcon.h>
#include <linux/io.h>
+#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_gpio.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-sun4i-usb.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
+#include <linux/workqueue.h>
+
+#define DRIVER_NAME "sun4i-usb-phy"
#define REG_ISCR 0x00
#define REG_PHYCTL 0x04
@@ -47,6 +53,17 @@
#define SUNXI_AHB_INCRX_ALIGN_EN BIT(8)
#define SUNXI_ULPI_BYPASS_EN BIT(0)
+/* ISCR, Interface Status and Control bits */
+#define ISCR_ID_PULLUP_EN (1 << 17)
+#define ISCR_DPDM_PULLUP_EN (1 << 16)
+/* sunxi has the phy id/vbus pins not connected, so we use the force bits */
+#define ISCR_FORCE_ID_MASK (3 << 14)
+#define ISCR_FORCE_ID_LOW (2 << 14)
+#define ISCR_FORCE_ID_HIGH (3 << 14)
+#define ISCR_FORCE_VBUS_MASK (3 << 12)
+#define ISCR_FORCE_VBUS_LOW (2 << 12)
+#define ISCR_FORCE_VBUS_HIGH (3 << 12)
+
/* Common Control Bits for Both PHYs */
#define PHY_PLL_BW 0x03
#define PHY_RES45_CAL_EN 0x0c
@@ -63,6 +80,13 @@
#define MAX_PHYS 3
+/*
+ * Note do not raise the debounce time, we must report Vusb high within 100ms
+ * otherwise we get Vbus errors
+ */
+#define DEBOUNCE_TIME msecs_to_jiffies(50)
+#define POLL_TIME msecs_to_jiffies(250)
+
struct sun4i_usb_phy_data {
void __iomem *base;
struct mutex mutex;
@@ -74,13 +98,58 @@ struct sun4i_usb_phy_data {
struct regulator *vbus;
struct reset_control *reset;
struct clk *clk;
+ bool regulator_on;
int index;
} phys[MAX_PHYS];
+ /* phy0 / otg related variables */
+ struct extcon_dev extcon;
+ const char *extcon_cable_names[3];
+ bool phy0_init;
+ bool phy0_poll;
+ struct gpio_desc *id_det_gpio;
+ struct gpio_desc *vbus_det_gpio;
+ int id_det_irq;
+ int vbus_det_irq;
+ int id_det;
+ int vbus_det;
+ struct delayed_work detect;
};
#define to_sun4i_usb_phy_data(phy) \
container_of((phy), struct sun4i_usb_phy_data, phys[(phy)->index])
+static void sun4i_usb_phy0_update_iscr(struct phy *_phy, u32 clr, u32 set)
+{
+ struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+ struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
+ u32 iscr;
+
+ iscr = readl(data->base + REG_ISCR);
+ iscr &= ~clr;
+ iscr |= set;
+ writel(iscr, data->base + REG_ISCR);
+}
+
+static void sun4i_usb_phy0_set_id_detect(struct phy *phy, u32 val)
+{
+ if (val)
+ val = ISCR_FORCE_ID_HIGH;
+ else
+ val = ISCR_FORCE_ID_LOW;
+
+ sun4i_usb_phy0_update_iscr(phy, ISCR_FORCE_ID_MASK, val);
+}
+
+static void sun4i_usb_phy0_set_vbus_detect(struct phy *phy, u32 val)
+{
+ if (val)
+ val = ISCR_FORCE_VBUS_HIGH;
+ else
+ val = ISCR_FORCE_VBUS_LOW;
+
+ sun4i_usb_phy0_update_iscr(phy, ISCR_FORCE_VBUS_MASK, val);
+}
+
static void sun4i_usb_phy_write(struct sun4i_usb_phy *phy, u32 addr, u32 data,
int len)
{
@@ -171,12 +240,39 @@ static int sun4i_usb_phy_init(struct phy *_phy)
sun4i_usb_phy_passby(phy, 1);
+ if (phy->index == 0) {
+ data->phy0_init = true;
+
+ /* Enable pull-ups */
+ sun4i_usb_phy0_update_iscr(_phy, 0, ISCR_DPDM_PULLUP_EN);
+ sun4i_usb_phy0_update_iscr(_phy, 0, ISCR_ID_PULLUP_EN);
+
+ if (data->id_det_gpio) {
+ /* OTG mode, force ISCR and cable state updates */
+ data->id_det = -1;
+ data->vbus_det = -1;
+ queue_delayed_work(system_wq, &data->detect, 0);
+ } else {
+ /* Host only mode */
+ sun4i_usb_phy0_set_id_detect(_phy, 0);
+ sun4i_usb_phy0_set_vbus_detect(_phy, 1);
+ }
+ }
+
return 0;
}
static int sun4i_usb_phy_exit(struct phy *_phy)
{
struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+ struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
+
+ if (phy->index == 0) {
+ /* Disable pull-ups */
+ sun4i_usb_phy0_update_iscr(_phy, ISCR_DPDM_PULLUP_EN, 0);
+ sun4i_usb_phy0_update_iscr(_phy, ISCR_ID_PULLUP_EN, 0);
+ data->phy0_init = false;
+ }
sun4i_usb_phy_passby(phy, 0);
reset_control_assert(phy->reset);
@@ -188,20 +284,46 @@ static int sun4i_usb_phy_exit(struct phy *_phy)
static int sun4i_usb_phy_power_on(struct phy *_phy)
{
struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
- int ret = 0;
+ struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
+ int ret;
+
+ if (!phy->vbus || phy->regulator_on)
+ return 0;
+
+ /* For phy0 only turn on Vbus if we don't have an ext. Vbus */
+ if (phy->index == 0 && data->vbus_det)
+ return 0;
- if (phy->vbus)
- ret = regulator_enable(phy->vbus);
+ ret = regulator_enable(phy->vbus);
+ if (ret)
+ return ret;
- return ret;
+ phy->regulator_on = true;
+
+ /* We must report Vbus high within OTG_TIME_A_WAIT_VRISE msec. */
+ if (phy->index == 0 && data->phy0_poll)
+ mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
+
+ return 0;
}
static int sun4i_usb_phy_power_off(struct phy *_phy)
{
struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+ struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
+
+ if (!phy->vbus || !phy->regulator_on)
+ return 0;
- if (phy->vbus)
- regulator_disable(phy->vbus);
+ regulator_disable(phy->vbus);
+ phy->regulator_on = false;
+
+ /*
+ * phy0 vbus typically slowly discharges, sometimes this causes the
+ * Vbus gpio to not trigger an edge irq on Vbus off, so force a rescan.
+ */
+ if (phy->index == 0 && !data->phy0_poll)
+ mod_delayed_work(system_wq, &data->detect, POLL_TIME);
return 0;
}
@@ -221,6 +343,61 @@ static struct phy_ops sun4i_usb_phy_ops = {
.owner = THIS_MODULE,
};
+static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
+{
+ struct sun4i_usb_phy_data *data =
+ container_of(work, struct sun4i_usb_phy_data, detect.work);
+ struct phy *phy0 = data->phys[0].phy;
+ int id_det, vbus_det, id_notify = 0, vbus_notify = 0;
+
+ id_det = gpiod_get_value_cansleep(data->id_det_gpio);
+ vbus_det = gpiod_get_value_cansleep(data->vbus_det_gpio);
+
+ mutex_lock(&phy0->mutex);
+
+ if (!data->phy0_init) {
+ mutex_unlock(&phy0->mutex);
+ return;
+ }
+
+ if (id_det != data->id_det) {
+ sun4i_usb_phy0_set_id_detect(phy0, id_det);
+ data->id_det = id_det;
+ id_notify = 1;
+ }
+
+ if (vbus_det != data->vbus_det) {
+ sun4i_usb_phy0_set_vbus_detect(phy0, vbus_det);
+ data->vbus_det = vbus_det;
+ vbus_notify = 1;
+ }
+
+ mutex_unlock(&phy0->mutex);
+
+ if (id_notify)
+ extcon_set_cable_state(&data->extcon,
+ extcon_cable_name[EXTCON_USB_HOST],
+ !id_det);
+
+ if (vbus_notify)
+ extcon_set_cable_state(&data->extcon,
+ extcon_cable_name[EXTCON_USB],
+ vbus_det);
+
+ if (data->phy0_poll)
+ queue_delayed_work(system_wq, &data->detect, POLL_TIME);
+}
+
+static irqreturn_t sun4i_usb_phy0_id_vbus_det_irq(int irq, void *dev_id)
+{
+ struct sun4i_usb_phy_data *data = dev_id;
+
+ /* vbus or id changed, let the pins settle and then scan them */
+ mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
+
+ return IRQ_HANDLED;
+}
+
static struct phy *sun4i_usb_phy_xlate(struct device *dev,
struct of_phandle_args *args)
{
@@ -240,13 +417,20 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
struct phy_provider *phy_provider;
bool dedicated_clocks;
struct resource *res;
- int i;
+ int i, ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
mutex_init(&data->mutex);
+ INIT_DELAYED_WORK(&data->detect, sun4i_usb_phy0_id_vbus_det_scan);
+ data->extcon_cable_names[0] = extcon_cable_name[EXTCON_USB_HOST];
+ data->extcon_cable_names[1] = extcon_cable_name[EXTCON_USB];
+ data->extcon_cable_names[2] = NULL;
+ data->extcon.name = DRIVER_NAME;
+ data->extcon.supported_cable = data->extcon_cable_names;
+ data->extcon.dev.parent = dev;
if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-phy"))
data->num_phys = 2;
@@ -269,6 +453,34 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
if (IS_ERR(data->base))
return PTR_ERR(data->base);
+ data->id_det_gpio = devm_gpiod_get(dev, "usb0_id_det", GPIOD_IN);
+ if (IS_ERR(data->id_det_gpio)) {
+ if (PTR_ERR(data->id_det_gpio) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ data->id_det_gpio = NULL;
+ }
+
+ data->vbus_det_gpio = devm_gpiod_get(dev, "usb0_vbus_det", GPIOD_IN);
+ if (IS_ERR(data->vbus_det_gpio)) {
+ if (PTR_ERR(data->vbus_det_gpio) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ data->vbus_det_gpio = NULL;
+ }
+
+ /* We either want both gpio pins or neither (when in host mode) */
+ if (!data->id_det_gpio != !data->vbus_det_gpio) {
+ dev_err(dev, "failed to get id or vbus detect pin\n");
+ return -ENODEV;
+ }
+
+ if (data->id_det_gpio) {
+ ret = devm_extcon_dev_register(dev, &data->extcon);
+ if (ret) {
+ dev_err(dev, "failed to register extcon: %d\n", ret);
+ return ret;
+ }
+ }
+
for (i = 0; i < data->num_phys; i++) {
struct sun4i_usb_phy *phy = data->phys + i;
char name[16];
@@ -318,12 +530,54 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
phy_set_drvdata(phy->phy, &data->phys[i]);
}
+ data->id_det_irq = gpiod_to_irq(data->id_det_gpio);
+ data->vbus_det_irq = gpiod_to_irq(data->vbus_det_gpio);
+ if (data->id_det_irq < 0 || data->vbus_det_irq < 0)
+ data->phy0_poll = true;
+
+ if (data->id_det_irq >= 0) {
+ ret = devm_request_irq(dev, data->id_det_irq,
+ sun4i_usb_phy0_id_vbus_det_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ "usb0-id-det", data);
+ if (ret) {
+ dev_err(dev, "Err requesting id-det-irq: %d\n", ret);
+ return ret;
+ }
+ }
+
+ if (data->vbus_det_irq >= 0) {
+ ret = devm_request_irq(dev, data->vbus_det_irq,
+ sun4i_usb_phy0_id_vbus_det_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ "usb0-vbus-det", data);
+ if (ret) {
+ dev_err(dev, "Err requesting vbus-det-irq: %d\n", ret);
+ return ret;
+ }
+ }
+
dev_set_drvdata(dev, data);
phy_provider = devm_of_phy_provider_register(dev, sun4i_usb_phy_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
+static int sun4i_usb_phy_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
+
+ if (data->id_det_irq >= 0)
+ devm_free_irq(dev, data->id_det_irq, data);
+ if (data->vbus_det_irq >= 0)
+ devm_free_irq(dev, data->vbus_det_irq, data);
+
+ cancel_delayed_work_sync(&data->detect);
+
+ return 0;
+}
+
static const struct of_device_id sun4i_usb_phy_of_match[] = {
{ .compatible = "allwinner,sun4i-a10-usb-phy" },
{ .compatible = "allwinner,sun5i-a13-usb-phy" },
@@ -335,9 +589,10 @@ MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match);
static struct platform_driver sun4i_usb_phy_driver = {
.probe = sun4i_usb_phy_probe,
+ .remove = sun4i_usb_phy_remove,
.driver = {
.of_match_table = sun4i_usb_phy_of_match,
- .name = "sun4i-usb-phy",
+ .name = DRIVER_NAME,
}
};
module_platform_driver(sun4i_usb_phy_driver);
