diff options
author | Dmitry Osipenko <digetx@gmail.com> | 2021-09-12 21:17:15 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-05 12:47:49 +0200 |
commit | c1baf6c591e6901d3422d7a0d0d32ccf29883edf (patch) | |
tree | e861bc75716194e40b04ccd1dcc9cc2b260c1eb5 /drivers/usb/phy | |
parent | 7557c1bfd3777a5a720f80edf28b473cec022bed (diff) | |
download | linux-c1baf6c591e6901d3422d7a0d0d32ccf29883edf.tar.bz2 |
usb: phy: tegra: Support OTG mode programming
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>
Diffstat (limited to 'drivers/usb/phy')
-rw-r--r-- | drivers/usb/phy/phy-tegra-usb.c | 198 |
1 files changed, 193 insertions, 5 deletions
diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c index c0f432d509aa..68cd4b68e3a2 100644 --- a/drivers/usb/phy/phy-tegra-usb.c +++ b/drivers/usb/phy/phy-tegra-usb.c @@ -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: |