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usb: phy: tegra: Support OTG mode programming

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Support programming USB PHY into OTG mode.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20210912181718.1328-5-digetx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Osipenko
2021-09-12 21:17:15 +03:00
committed by Greg Kroah-Hartman
parent 7557c1bfd3
commit c1baf6c591
2 changed files with 198 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

198
drivers/usb/phy/phy-tegra-usb.c
View File

@@ -63,6 +63,10 @@
#define A_VBUS_VLD_WAKEUP_EN BIT(30)
#define USB_PHY_VBUS_WAKEUP_ID 0x408
#define ID_INT_EN BIT(0)
#define ID_CHG_DET BIT(1)
#define VBUS_WAKEUP_INT_EN BIT(8)
#define VBUS_WAKEUP_CHG_DET BIT(9)
#define VBUS_WAKEUP_STS BIT(10)
#define VBUS_WAKEUP_WAKEUP_EN BIT(30)
@@ -158,6 +162,10 @@
#define USB_USBMODE_HOST (3 << 0)
#define USB_USBMODE_DEVICE (2 << 0)
#define PMC_USB_AO 0xf0
#define VBUS_WAKEUP_PD_P0 BIT(2)
#define ID_PD_P0 BIT(3)
static DEFINE_SPINLOCK(utmip_pad_lock);
static unsigned int utmip_pad_count;
@@ -533,13 +541,14 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
val &= ~USB_WAKE_ON_RESUME_EN;
writel_relaxed(val, base + USB_SUSP_CTRL);
if (phy->mode == USB_DR_MODE_PERIPHERAL) {
if (phy->mode != USB_DR_MODE_HOST) {
val = readl_relaxed(base + USB_SUSP_CTRL);
val &= ~(USB_WAKE_ON_CNNT_EN_DEV | USB_WAKE_ON_DISCON_EN_DEV);
writel_relaxed(val, base + USB_SUSP_CTRL);
val = readl_relaxed(base + USB_PHY_VBUS_WAKEUP_ID);
val &= ~VBUS_WAKEUP_WAKEUP_EN;
val &= ~(ID_CHG_DET | VBUS_WAKEUP_CHG_DET);
writel_relaxed(val, base + USB_PHY_VBUS_WAKEUP_ID);
val = readl_relaxed(base + USB_PHY_VBUS_SENSORS);
@@ -687,9 +696,10 @@ static int utmi_phy_power_off(struct tegra_usb_phy *phy)
* Ask VBUS sensor to generate wake event once cable is
* connected.
*/
if (phy->mode == USB_DR_MODE_PERIPHERAL) {
if (phy->mode != USB_DR_MODE_HOST) {
val = readl_relaxed(base + USB_PHY_VBUS_WAKEUP_ID);
val |= VBUS_WAKEUP_WAKEUP_EN;
val &= ~(ID_CHG_DET | VBUS_WAKEUP_CHG_DET);
writel_relaxed(val, base + USB_PHY_VBUS_WAKEUP_ID);
val = readl_relaxed(base + USB_PHY_VBUS_SENSORS);
@@ -893,6 +903,7 @@ static void tegra_usb_phy_shutdown(struct usb_phy *u_phy)
if (WARN_ON(!phy->freq))
return;
usb_phy_set_wakeup(u_phy, false);
tegra_usb_phy_power_off(phy);
if (!phy->is_ulpi_phy)
@@ -904,26 +915,146 @@ static void tegra_usb_phy_shutdown(struct usb_phy *u_phy)
phy->freq = NULL;
}
static irqreturn_t tegra_usb_phy_isr(int irq, void *data)
{
u32 val, int_mask = ID_CHG_DET | VBUS_WAKEUP_CHG_DET;
struct tegra_usb_phy *phy = data;
void __iomem *base = phy->regs;
/*
* The PHY interrupt also wakes the USB controller driver since
* interrupt is shared. We don't do anything in the PHY driver,
* so just clear the interrupt.
*/
val = readl_relaxed(base + USB_PHY_VBUS_WAKEUP_ID);
writel_relaxed(val, base + USB_PHY_VBUS_WAKEUP_ID);
return val & int_mask ? IRQ_HANDLED : IRQ_NONE;
}
static int tegra_usb_phy_set_wakeup(struct usb_phy *u_phy, bool enable)
{
struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
void __iomem *base = phy->regs;
int ret = 0;
u32 val;
if (phy->wakeup_enabled && phy->mode != USB_DR_MODE_HOST &&
phy->irq > 0) {
disable_irq(phy->irq);
val = readl_relaxed(base + USB_PHY_VBUS_WAKEUP_ID);
val &= ~(ID_INT_EN | VBUS_WAKEUP_INT_EN);
writel_relaxed(val, base + USB_PHY_VBUS_WAKEUP_ID);
enable_irq(phy->irq);
free_irq(phy->irq, phy);
phy->wakeup_enabled = false;
}
if (enable && phy->mode != USB_DR_MODE_HOST && phy->irq > 0) {
ret = request_irq(phy->irq, tegra_usb_phy_isr, IRQF_SHARED,
dev_name(phy->u_phy.dev), phy);
if (!ret) {
disable_irq(phy->irq);
/*
* USB clock will be resumed once wake event will be
* generated. The ID-change event requires to have
* interrupts enabled, otherwise it won't be generated.
*/
val = readl_relaxed(base + USB_PHY_VBUS_WAKEUP_ID);
val |= ID_INT_EN | VBUS_WAKEUP_INT_EN;
writel_relaxed(val, base + USB_PHY_VBUS_WAKEUP_ID);
enable_irq(phy->irq);
} else {
dev_err(phy->u_phy.dev,
"Failed to request interrupt: %d", ret);
enable = false;
}
}
phy->wakeup_enabled = enable;
return 0;
return ret;
}
static int tegra_usb_phy_set_suspend(struct usb_phy *u_phy, int suspend)
{
struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
int ret;
if (WARN_ON(!phy->freq))
return -EINVAL;
/*
* PHY is sharing IRQ with the CI driver, hence here we either
* disable interrupt for both PHY and CI or for CI only. The
* interrupt needs to be disabled while hardware is reprogrammed
* because interrupt touches the programmed registers, and thus,
* there could be a race condition.
*/
if (phy->irq > 0)
disable_irq(phy->irq);
if (suspend)
return tegra_usb_phy_power_off(phy);
ret = tegra_usb_phy_power_off(phy);
else
return tegra_usb_phy_power_on(phy);
ret = tegra_usb_phy_power_on(phy);
if (phy->irq > 0)
enable_irq(phy->irq);
return ret;
}
static int tegra_usb_phy_configure_pmc(struct tegra_usb_phy *phy)
{
int err, val = 0;
/* older device-trees don't have PMC regmap */
if (!phy->pmc_regmap)
return 0;
/*
* Tegra20 has a different layout of PMC USB register bits and AO is
* enabled by default after system reset on Tegra20, so assume nothing
* to do on Tegra20.
*/
if (!phy->soc_config->requires_pmc_ao_power_up)
return 0;
/* enable VBUS wake-up detector */
if (phy->mode != USB_DR_MODE_HOST)
val |= VBUS_WAKEUP_PD_P0 << phy->instance * 4;
/* enable ID-pin ACC detector for OTG mode switching */
if (phy->mode == USB_DR_MODE_OTG)
val |= ID_PD_P0 << phy->instance * 4;
/* disable detectors to reset them */
err = regmap_set_bits(phy->pmc_regmap, PMC_USB_AO, val);
if (err) {
dev_err(phy->u_phy.dev, "Failed to disable PMC AO: %d\n", err);
return err;
}
usleep_range(10, 100);
/* enable detectors */
err = regmap_clear_bits(phy->pmc_regmap, PMC_USB_AO, val);
if (err) {
dev_err(phy->u_phy.dev, "Failed to enable PMC AO: %d\n", err);
return err;
}
/* detectors starts to work after 10ms */
usleep_range(10000, 15000);
return 0;
}
static int tegra_usb_phy_init(struct usb_phy *u_phy)
@@ -967,6 +1098,10 @@ static int tegra_usb_phy_init(struct usb_phy *u_phy)
goto disable_vbus;
}
err = tegra_usb_phy_configure_pmc(phy);
if (err)
goto close_phy;
err = tegra_usb_phy_power_on(phy);
if (err)
goto close_phy;
@@ -1135,11 +1270,56 @@ static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
return 0;
}
static void tegra_usb_phy_put_pmc_device(void *dev)
{
put_device(dev);
}
static int tegra_usb_phy_parse_pmc(struct device *dev,
struct tegra_usb_phy *phy)
{
struct platform_device *pmc_pdev;
struct of_phandle_args args;
int err;
err = of_parse_phandle_with_fixed_args(dev->of_node, "nvidia,pmc",
1, 0, &args);
if (err) {
if (err != -ENOENT)
return err;
dev_warn_once(dev, "nvidia,pmc is missing, please update your device-tree\n");
return 0;
}
pmc_pdev = of_find_device_by_node(args.np);
of_node_put(args.np);
if (!pmc_pdev)
return -ENODEV;
err = devm_add_action_or_reset(dev, tegra_usb_phy_put_pmc_device,
&pmc_pdev->dev);
if (err)
return err;
if (!platform_get_drvdata(pmc_pdev))
return -EPROBE_DEFER;
phy->pmc_regmap = dev_get_regmap(&pmc_pdev->dev, "usb_sleepwalk");
if (!phy->pmc_regmap)
return -EINVAL;
phy->instance = args.args[0];
return 0;
}
static const struct tegra_phy_soc_config tegra20_soc_config = {
.utmi_pll_config_in_car_module = false,
.has_hostpc = false,
.requires_usbmode_setup = false,
.requires_extra_tuning_parameters = false,
.requires_pmc_ao_power_up = false,
};
static const struct tegra_phy_soc_config tegra30_soc_config = {
@@ -1147,6 +1327,7 @@ static const struct tegra_phy_soc_config tegra30_soc_config = {
.has_hostpc = true,
.requires_usbmode_setup = true,
.requires_extra_tuning_parameters = true,
.requires_pmc_ao_power_up = true,
};
static const struct of_device_id tegra_usb_phy_id_table[] = {
@@ -1172,6 +1353,7 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
return -ENOMEM;
tegra_phy->soc_config = of_device_get_match_data(&pdev->dev);
tegra_phy->irq = platform_get_irq_optional(pdev, 0);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
@@ -1215,6 +1397,12 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
return err;
}
err = tegra_usb_phy_parse_pmc(&pdev->dev, tegra_phy);
if (err) {
dev_err_probe(&pdev->dev, err, "Failed to get PMC regmap\n");
return err;
}
phy_type = of_usb_get_phy_mode(np);
switch (phy_type) {
case USBPHY_INTERFACE_MODE_UTMI:

5
include/linux/usb/tegra_usb_phy.h
View File

@@ -18,6 +18,7 @@
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/usb/otg.h>
@@ -30,6 +31,7 @@
* enter host mode
* requires_extra_tuning_parameters: true if xcvr_hsslew, hssquelch_level
* and hsdiscon_level should be set for adequate signal quality
* requires_pmc_ao_power_up: true if USB AO is powered down by default
*/
struct tegra_phy_soc_config {
@@ -37,6 +39,7 @@ struct tegra_phy_soc_config {
bool has_hostpc;
bool requires_usbmode_setup;
bool requires_extra_tuning_parameters;
bool requires_pmc_ao_power_up;
};
struct tegra_utmip_config {
@@ -62,6 +65,7 @@ enum tegra_usb_phy_port_speed {
struct tegra_xtal_freq;
struct tegra_usb_phy {
int irq;
int instance;
const struct tegra_xtal_freq *freq;
void __iomem *regs;
@@ -70,6 +74,7 @@ struct tegra_usb_phy {
struct clk *pll_u;
struct clk *pad_clk;
struct regulator *vbus;
struct regmap *pmc_regmap;
enum usb_dr_mode mode;
void *config;
const struct tegra_phy_soc_config *soc_config;