[Patch V2 12/18] usb: gadget: tegra-xudc: support multiple device modes

Nagarjuna Kristam
2019-12-18T09:17:44Z

This change supports limited multiple device modes by:
- At most 4 ports contains OTG/Device capability.
- One port run as device mode at a time.

Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
---
V2:
- Updated err variable on failure to get usbphy.
- Corrected identation after tegra_xudc_phy_get API call in tegra_xudc_probe.
---
drivers/usb/gadget/udc/tegra-xudc.c | 228 ++++++++++++++++++++++++++----------
1 file changed, 167 insertions(+), 61 deletions(-)

diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
index 283c320..bf80fae 100644
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -483,14 +483,15 @@ struct tegra_xudc {
bool device_mode;
struct work_struct usb_role_sw_work;

- struct phy *usb3_phy;
- struct phy *utmi_phy;
+ struct phy **usb3_phy;
+ struct phy **utmi_phy;

struct tegra_xudc_save_regs saved_regs;
bool suspended;
bool powergated;

- struct usb_phy *usbphy;
+ struct usb_phy **usbphy;
+ int current_phy_index;
struct notifier_block vbus_nb;

struct completion disconnect_complete;
@@ -522,6 +523,7 @@ struct tegra_xudc_soc {
unsigned int num_supplies;
const char * const *clock_names;
unsigned int num_clks;
+ unsigned int num_phys;
bool u1_enable;
bool u2_enable;
bool lpm_enable;
@@ -605,17 +607,18 @@ static void tegra_xudc_device_mode_on(struct tegra_xudc *xudc)
return;
pm_runtime_get_sync(xudc->dev);

- err = phy_power_on(xudc->utmi_phy);
+ err = phy_power_on(xudc->utmi_phy[xudc->current_phy_index]);
if (err < 0)
dev_err(xudc->dev, "utmi power on failed %d\n", err);

- err = phy_power_on(xudc->usb3_phy);
+ err = phy_power_on(xudc->usb3_phy[xudc->current_phy_index]);
if (err < 0)
dev_err(xudc->dev, "usb3 phy power on failed %d\n", err);

dev_dbg(xudc->dev, "device mode on\n");

- phy_set_mode_ext(xudc->utmi_phy, PHY_MODE_USB_OTG, USB_ROLE_DEVICE);
+ phy_set_mode_ext(xudc->utmi_phy[xudc->current_phy_index],
+ PHY_MODE_USB_OTG, USB_ROLE_DEVICE);

xudc->device_mode = true;

@@ -636,7 +639,8 @@ static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)

reinit_completion(&xudc->disconnect_complete);

- phy_set_mode_ext(xudc->utmi_phy, PHY_MODE_USB_OTG, USB_ROLE_NONE);
+ phy_set_mode_ext(xudc->utmi_phy[xudc->current_phy_index],
+ PHY_MODE_USB_OTG, USB_ROLE_NONE);

pls = (xudc_readl(xudc, PORTSC) & PORTSC_PLS_MASK) >>
PORTSC_PLS_SHIFT;
@@ -663,11 +667,11 @@ static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
/* Make sure interrupt handler has completed before powergating. */
synchronize_irq(xudc->irq);

- err = phy_power_off(xudc->utmi_phy);
+ err = phy_power_off(xudc->utmi_phy[xudc->current_phy_index]);
if (err < 0)
dev_err(xudc->dev, "utmi_phy power off failed %d\n", err);

- err = phy_power_off(xudc->usb3_phy);
+ err = phy_power_off(xudc->usb3_phy[xudc->current_phy_index]);
if (err < 0)
dev_err(xudc->dev, "usb3_phy power off failed %d\n", err);

@@ -685,17 +689,43 @@ static void tegra_xudc_usb_role_sw_work(struct work_struct *work)
tegra_xudc_device_mode_off(xudc);
}

-static int tegra_xudc_vbus_notifier(struct notifier_block *nb,
+static int tegra_xudc_get_phy_index(struct tegra_xudc *xudc,
+ struct usb_phy *usbphy)
+{
+ int i;
+
+ for (i = 0; i < xudc->soc->num_phys; i++) {
+ if (xudc->usbphy[i] && usbphy == xudc->usbphy[i])
+ return i;
+ }
+
+ dev_info(xudc->dev, "phy index could not be found for shared usb-phy");
+ return -1;
+}
+
+static int tegra_xudc_vbus_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct tegra_xudc *xudc = container_of(nb, struct tegra_xudc,
vbus_nb);
+ struct usb_phy *usbphy = (struct usb_phy *)data;

dev_dbg(xudc->dev, "%s action is %ld\n", __func__, action);

+ if ((xudc->device_mode && action == USB_ROLE_DEVICE) ||
+ (!xudc->device_mode && action != USB_ROLE_DEVICE)) {
+ dev_info(xudc->dev, "Same role(%d) received. Ignore",
+ xudc->device_mode);
+ return NOTIFY_OK;
+ }
+
xudc->role = (enum usb_role)action;

- if (!xudc->suspended)
+ xudc->current_phy_index = tegra_xudc_get_phy_index(xudc, usbphy);
+ dev_dbg(xudc->dev, "%s current phy index is %d\n", __func__,
+ xudc->current_phy_index);
+
+ if (!xudc->suspended && xudc->current_phy_index != -1)
schedule_work(&xudc->usb_role_sw_work);

return NOTIFY_OK;
@@ -716,10 +746,12 @@ static void tegra_xudc_plc_reset_work(struct work_struct *work)

if (pls == PORTSC_PLS_INACTIVE) {
dev_info(xudc->dev, "PLS = Inactive. Toggle VBUS\n");
- phy_set_mode_ext(xudc->utmi_phy, PHY_MODE_USB_OTG,
- USB_ROLE_NONE);
- phy_set_mode_ext(xudc->utmi_phy, PHY_MODE_USB_OTG,
- USB_ROLE_DEVICE);
+ phy_set_mode_ext(
+ xudc->utmi_phy[xudc->current_phy_index],
+ PHY_MODE_USB_OTG, USB_ROLE_NONE);
+ phy_set_mode_ext(
+ xudc->utmi_phy[xudc->current_phy_index],
+ PHY_MODE_USB_OTG, USB_ROLE_DEVICE);

xudc->wait_csc = false;
}
@@ -747,7 +779,8 @@ static void tegra_xudc_port_reset_war_work(struct work_struct *work)
if (pls == PORTSC_PLS_DISABLED) {
dev_dbg(xudc->dev, "toggle vbus\n");
/* PRC doesn't complete in 100ms, toggle the vbus */
- ret = tegra_phy_xusb_utmi_port_reset(xudc->utmi_phy);
+ ret = tegra_phy_xusb_utmi_port_reset(
+ xudc->utmi_phy[xudc->current_phy_index]);
if (ret == 1)
xudc->wait_for_sec_prc = 0;
}
@@ -1935,7 +1968,7 @@ static int tegra_xudc_gadget_start(struct usb_gadget *gadget,
struct tegra_xudc *xudc = to_xudc(gadget);
unsigned long flags;
u32 val;
- int ret;
+ int ret, i;

if (!driver)
return -EINVAL;
@@ -1971,8 +2004,9 @@ static int tegra_xudc_gadget_start(struct usb_gadget *gadget,
xudc_writel(xudc, val, CTRL);
}

- if (xudc->usbphy)
- otg_set_peripheral(xudc->usbphy->otg, gadget);
+ for (i = 0; i < xudc->soc->num_phys; i++)
+ if (xudc->usbphy[i])
+ otg_set_peripheral(xudc->usbphy[i]->otg, gadget);

xudc->driver = driver;
unlock:
@@ -1989,13 +2023,15 @@ static int tegra_xudc_gadget_stop(struct usb_gadget *gadget)
struct tegra_xudc *xudc = to_xudc(gadget);
unsigned long flags;
u32 val;
+ int i;

pm_runtime_get_sync(xudc->dev);

spin_lock_irqsave(&xudc->lock, flags);

- if (xudc->usbphy)
- otg_set_peripheral(xudc->usbphy->otg, NULL);
+ for (i = 0; i < xudc->soc->num_phys; i++)
+ if (xudc->usbphy[i])
+ otg_set_peripheral(xudc->usbphy[i]->otg, NULL);

val = xudc_readl(xudc, CTRL);
val &= ~(CTRL_IE | CTRL_ENABLE);
@@ -3329,33 +3365,118 @@ static void tegra_xudc_device_params_init(struct tegra_xudc *xudc)
xudc_writel(xudc, val, CFG_DEV_SSPI_XFER);
}

-static int tegra_xudc_phy_init(struct tegra_xudc *xudc)
+static int tegra_xudc_phy_get(struct tegra_xudc *xudc)
{
- int err;
+ int err = 0, i, usb3;

- err = phy_init(xudc->utmi_phy);
- if (err < 0) {
- dev_err(xudc->dev, "utmi phy init failed: %d\n", err);
- return err;
- }
+ xudc->utmi_phy = devm_kcalloc(xudc->dev, xudc->soc->num_phys,
+ sizeof(*xudc->utmi_phy), GFP_KERNEL);
+ if (!xudc->utmi_phy)
+ return -ENOMEM;

- err = phy_init(xudc->usb3_phy);
- if (err < 0) {
- dev_err(xudc->dev, "usb3 phy init failed: %d\n", err);
- goto exit_utmi_phy;
+ xudc->usb3_phy = devm_kcalloc(xudc->dev, xudc->soc->num_phys,
+ sizeof(*xudc->usb3_phy), GFP_KERNEL);
+ if (!xudc->usb3_phy)
+ return -ENOMEM;
+
+ xudc->usbphy = devm_kcalloc(xudc->dev, xudc->soc->num_phys,
+ sizeof(*xudc->usbphy), GFP_KERNEL);
+ if (!xudc->usbphy)
+ return -ENOMEM;
+
+ xudc->vbus_nb.notifier_call = tegra_xudc_vbus_notify;
+
+ for (i = 0; i < xudc->soc->num_phys; i++) {
+ char phy_name[] = "usb.-.";
+
+ /* Get USB2 phy */
+ snprintf(phy_name, sizeof(phy_name), "usb2-%d", i);
+ xudc->utmi_phy[i] = devm_phy_optional_get(xudc->dev, phy_name);
+ if (IS_ERR(xudc->utmi_phy[i])) {
+ err = PTR_ERR(xudc->utmi_phy[i]);
+ if (err != -EPROBE_DEFER)
+ dev_err(xudc->dev, "failed to get usb2-%d phy: %d\n",
+ i, err);
+
+ goto clean_up;
+ } else if (xudc->utmi_phy[i]) {
+ /* Get usb-phy, if utmi phy is available */
+ xudc->usbphy[i] = devm_usb_get_phy_by_node(xudc->dev,
+ xudc->utmi_phy[i]->dev.of_node,
+ &xudc->vbus_nb);
+ if (IS_ERR(xudc->usbphy[i])) {
+ err = PTR_ERR(xudc->usbphy[i]);
+ dev_err(xudc->dev, "failed to get usbphy-%d: %d\n",
+ i, err);
+ goto clean_up;
+ }
+ } else if (!xudc->utmi_phy[i]) {
+ /* if utmi phy is not available, ignore USB3 phy get */
+ continue;
+ }
+
+ /* Get USB3 phy */
+ usb3 = tegra_xusb_padctl_get_usb3_companion(xudc->padctl, i);
+ if (usb3 < 0)
+ continue;
+
+ snprintf(phy_name, sizeof(phy_name), "usb3-%d", usb3);
+ xudc->usb3_phy[i] = devm_phy_optional_get(xudc->dev, phy_name);
+ if (IS_ERR(xudc->usb3_phy[i])) {
+ err = PTR_ERR(xudc->usb3_phy[i]);
+ if (err != -EPROBE_DEFER)
+ dev_err(xudc->dev, "failed to get usb3-%d phy: %d\n",
+ usb3, err);
+
+ goto clean_up;
+ } else if (xudc->usb3_phy[i])
+ dev_dbg(xudc->dev, "usb3_phy-%d registered", usb3);
}

- return 0;
+ return err;
+
+clean_up:
+ for (i = 0; i < xudc->soc->num_phys; i++) {
+ xudc->usb3_phy[i] = NULL;
+ xudc->utmi_phy[i] = NULL;
+ xudc->usbphy[i] = NULL;
+ }

-exit_utmi_phy:
- phy_exit(xudc->utmi_phy);
return err;
}

static void tegra_xudc_phy_exit(struct tegra_xudc *xudc)
{
- phy_exit(xudc->usb3_phy);
- phy_exit(xudc->utmi_phy);
+ int i;
+
+ for (i = 0; i < xudc->soc->num_phys; i++) {
+ phy_exit(xudc->usb3_phy[i]);
+ phy_exit(xudc->utmi_phy[i]);
+ }
+}
+
+static int tegra_xudc_phy_init(struct tegra_xudc *xudc)
+{
+ int err, i;
+
+ for (i = 0; i < xudc->soc->num_phys; i++) {
+ err = phy_init(xudc->utmi_phy[i]);
+ if (err < 0) {
+ dev_err(xudc->dev, "utmi phy init failed: %d\n", err);
+ goto exit_phy;
+ }
+
+ err = phy_init(xudc->usb3_phy[i]);
+ if (err < 0) {
+ dev_err(xudc->dev, "usb3 phy init failed: %d\n", err);
+ goto exit_phy;
+ }
+ }
+ return 0;
+
+exit_phy:
+ tegra_xudc_phy_exit(xudc);
+ return err;
}

static const char * const tegra210_xudc_supply_names[] = {
@@ -3383,6 +3504,7 @@ static struct tegra_xudc_soc tegra210_xudc_soc_data = {
.num_supplies = ARRAY_SIZE(tegra210_xudc_supply_names),
.clock_names = tegra210_xudc_clock_names,
.num_clks = ARRAY_SIZE(tegra210_xudc_clock_names),
+ .num_phys = 4,
.u1_enable = false,
.u2_enable = true,
.lpm_enable = false,
@@ -3395,6 +3517,7 @@ static struct tegra_xudc_soc tegra210_xudc_soc_data = {
static struct tegra_xudc_soc tegra186_xudc_soc_data = {
.clock_names = tegra186_xudc_clock_names,
.num_clks = ARRAY_SIZE(tegra186_xudc_clock_names),
+ .num_phys = 4,
.u1_enable = true,
.u2_enable = true,
.lpm_enable = false,
@@ -3560,19 +3683,9 @@ static int tegra_xudc_probe(struct platform_device *pdev)
goto put_padctl;
}

- xudc->usb3_phy = devm_phy_optional_get(&pdev->dev, "usb3");
- if (IS_ERR(xudc->usb3_phy)) {
- err = PTR_ERR(xudc->usb3_phy);
- dev_err(xudc->dev, "failed to get usb3 phy: %d\n", err);
- goto disable_regulator;
- }
-
- xudc->utmi_phy = devm_phy_optional_get(&pdev->dev, "usb2");
- if (IS_ERR(xudc->utmi_phy)) {
- err = PTR_ERR(xudc->utmi_phy);
- dev_err(xudc->dev, "failed to get usb2 phy: %d\n", err);
+ err = tegra_xudc_phy_get(xudc);
+ if (err)
goto disable_regulator;
- }

err = tegra_xudc_powerdomain_init(xudc);
if (err)
@@ -3601,16 +3714,6 @@ static int tegra_xudc_probe(struct platform_device *pdev)
INIT_DELAYED_WORK(&xudc->port_reset_war_work,
tegra_xudc_port_reset_war_work);

- xudc->vbus_nb.notifier_call = tegra_xudc_vbus_notifier;
- xudc->usbphy = devm_usb_get_phy_by_node(xudc->dev,
- xudc->utmi_phy->dev.of_node,
- &xudc->vbus_nb);
- if (IS_ERR(xudc->usbphy)) {
- err = PTR_ERR(xudc->usbphy);
- dev_err(xudc->dev, "failed to get usbphy phy: %d\n", err);
- goto free_eps;
- }
-
pm_runtime_enable(&pdev->dev);

xudc->gadget.ops = &tegra_xudc_gadget_ops;
@@ -3645,6 +3748,7 @@ static int tegra_xudc_probe(struct platform_device *pdev)
static int tegra_xudc_remove(struct platform_device *pdev)
{
struct tegra_xudc *xudc = platform_get_drvdata(pdev);
+ int i;

pm_runtime_get_sync(xudc->dev);

@@ -3660,8 +3764,10 @@ static int tegra_xudc_remove(struct platform_device *pdev)

regulator_bulk_disable(xudc->soc->num_supplies, xudc->supplies);

- phy_power_off(xudc->utmi_phy);
- phy_power_off(xudc->usb3_phy);
+ for (i = 0; i < xudc->soc->num_phys; i++) {
+ phy_power_off(xudc->utmi_phy[i]);
+ phy_power_off(xudc->usb3_phy[i]);
+ }

tegra_xudc_phy_exit(xudc);

--
2.7.4