From: Andrew Chew <[email protected]> Add code to try to get platform data information (register base, irq, modes, various tuning parameters) from device tree, if not present in board files.
Signed-off-by: Andrew Chew <[email protected]> --- .../devicetree/bindings/usb/tegra20-ehci.txt | 28 +++ drivers/usb/host/ehci-tegra.c | 221 ++++++++++++++++++++ 2 files changed, 249 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/usb/tegra20-ehci.txt diff --git a/Documentation/devicetree/bindings/usb/tegra20-ehci.txt b/Documentation/devicetree/bindings/usb/tegra20-ehci.txt new file mode 100644 index 0000000..5a73a96 --- /dev/null +++ b/Documentation/devicetree/bindings/usb/tegra20-ehci.txt @@ -0,0 +1,28 @@ +NVIDIA Tegra20 SOC USB controllers + +The device node for a USB controller that is part of a Tegra20 +SOC is as described in the document "Open Firmware Recommended +Practice: Universal Serial Bus" with the following modifications +and additions: + +Required properties: + - compatible: Should be "nvidia,tegra20-ehci". + - mode: Should be one of "device", "host", or "otg". + - power_down_on_bus_suspend: For host mode only, should be <1> if you + want the USB phy to power down when the host is suspended. Else, it + should be <0>. + - type: Should be one of "utmi" or "ulpi". + +Required properties for type = "utmi". These values are derived from +characterization by system engineering. + - hssync_start_delay + - idle_wait_delay + - elastic_limit + - term_range_adj + - xcvr_setup + - xcvr_lsfslew + - xcvr_lsrslew + +Required properties for type = "ulpi": + - reset_gpio: The GPIO used to drive reset + - clk diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c index 02b2bfd..89144d5 100644 --- a/drivers/usb/host/ehci-tegra.c +++ b/drivers/usb/host/ehci-tegra.c @@ -21,10 +21,20 @@ #include <linux/platform_data/tegra_usb.h> #include <linux/irq.h> #include <linux/usb/otg.h> + +#if defined(CONFIG_OF) +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#endif + #include <mach/usb_phy.h> #define TEGRA_USB_DMA_ALIGN 32 +static u64 tegra_ehci_dmamask = DMA_BIT_MASK(TEGRA_USB_DMA_ALIGN); + struct tegra_ehci_hcd { struct ehci_hcd *ehci; struct tegra_usb_phy *phy; @@ -574,9 +584,181 @@ static const struct hc_driver tegra_ehci_hc_driver = { .port_handed_over = ehci_port_handed_over, }; +#if defined(CONFIG_OF) +static int tegra_ehci_parse_dt_node_utmi(struct device_node *dn, + struct platform_device *pdev, + struct tegra_ehci_platform_data *pdata) +{ + struct device *dev = &pdev->dev; + struct tegra_utmip_config *phy_config; + int retval; + + phy_config = devm_kzalloc(dev, sizeof(struct tegra_utmip_config), + GFP_KERNEL); + if (!phy_config) + return -ENOMEM; + + retval = of_property_read_u32(dn, "hssync_start_delay", + (u32 *)&phy_config->hssync_start_delay); + if (retval) { + dev_err(dev, "Missing dt property \"hssync_start_delay\"\n"); + return retval; + } + + retval = of_property_read_u32(dn, "elastic_limit", + (u32 *)&phy_config->elastic_limit); + if (retval) { + dev_err(dev, "Missing dt property \"elastic_limit\"\n"); + return retval; + } + + retval = of_property_read_u32(dn, "idle_wait_delay", + (u32 *)&phy_config->idle_wait_delay); + if (retval) { + dev_err(dev, "Missing dt property \"idle_wait_delay\"\n"); + return retval; + } + + retval = of_property_read_u32(dn, "term_range_adj", + (u32 *)&phy_config->term_range_adj); + if (retval) { + dev_err(dev, "Missing dt property \"term_range_adj\"\n"); + return retval; + } + + retval = of_property_read_u32(dn, "xcvr_setup", + (u32 *)&phy_config->xcvr_setup); + if (retval) { + dev_err(dev, "Missing dt property \"xcvr_setup\"\n"); + return retval; + } + + retval = of_property_read_u32(dn, "xcvr_lsfslew", + (u32 *)&phy_config->xcvr_lsfslew); + if (retval) { + dev_err(dev, "Missing dt property \"xcvr_lsfslew\"\n"); + return retval; + } + + retval = of_property_read_u32(dn, "xcvr_lsrslew", + (u32 *)&phy_config->xcvr_lsrslew); + if (retval) { + dev_err(dev, "Missing dt property \"xcvr_lsrslew\"\n"); + return retval; + } + + pdata->phy_config = phy_config; + + return 0; +} + +static int tegra_ehci_parse_dt_node_ulpi(struct device_node *dn, + struct platform_device *pdev, + struct tegra_ehci_platform_data *pdata) +{ + struct device *dev = &pdev->dev; + struct tegra_ulpi_config *phy_config; + int retval; + + phy_config = devm_kzalloc(dev, sizeof(struct tegra_ulpi_config), + GFP_KERNEL); + if (!phy_config) + return -ENOMEM; + + retval = of_property_read_u32(dn, "reset_gpio", + &phy_config->reset_gpio); + if (retval) { + dev_err(dev, "Missing dt property \"reset_gpio\"\n"); + return retval; + } + + retval = of_property_read_string(dn, "clk", + (char **)&phy_config->clk); + if (retval) { + dev_err(dev, "Missing dt property \"clk\"\n"); + return retval; + } + + pdata->phy_config = phy_config; + + return 0; +} + +static struct tegra_ehci_platform_data * +tegra_ehci_parse_dt_node(struct device_node *dn, + struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct tegra_ehci_platform_data *pdata; + char *mode; + char *type; + int retval; + + pdata = devm_kzalloc(dev, sizeof(struct tegra_ehci_platform_data), + GFP_KERNEL); + if (!pdata) + return NULL; + + retval = of_property_read_string(dn, "mode", &mode); + if (retval) { + dev_err(dev, "Missing dt property \"mode\"\n"); + goto fail; + } + + if (strcmp(mode, "device") == 0) + pdata->operating_mode = TEGRA_USB_DEVICE; + else if (strcmp(mode, "host") == 0) + pdata->operating_mode = TEGRA_USB_HOST; + else if (strcmp(mode, "otg") == 0) + pdata->operating_mode = TEGRA_USB_OTG; + else { + dev_err(dev, "Invalid dt property \"mode\" value %s\n", mode); + goto fail; + } + + retval = of_property_read_u32(dn, "power_down_on_bus_suspend", + &pdata->power_down_on_bus_suspend); + if (retval) { + dev_err(dev, "Missing dt property " + "\"power_down_on_bus_suspend\"\n"); + goto fail; + } + + retval = of_property_read_string(dn, "type", &type); + if (retval) { + dev_err(dev, "Missing dt property \"type\"\n"); + goto fail; + } + + if (strcmp(type, "utmi") == 0) { + retval = tegra_ehci_parse_dt_node_utmi(dn, pdev, pdata); + if (retval) + goto fail; + } else if (strcmp(type, "ulpi") == 0) { + retval = tegra_ehci_parse_dt_node_ulpi(dn, pdev, pdata); + if (retval) + goto fail; + } else { + dev_err(dev, "Invalid dt property \"type\" value %s\n", type); + goto fail; + } + + return pdata; + +fail: + devm_kfree(dev, pdata); + + return NULL; +} +#endif + static int tegra_ehci_probe(struct platform_device *pdev) { struct resource *res; +#if defined(CONFIG_OF) + struct device_node *dn = pdev->dev.of_node; + struct resource of_res; +#endif struct usb_hcd *hcd; struct tegra_ehci_hcd *tegra; struct tegra_ehci_platform_data *pdata; @@ -584,7 +766,20 @@ static int tegra_ehci_probe(struct platform_device *pdev) int irq; int instance = pdev->id; + /* + * See if there's any platform data passed via board files. + * If there isn't, then allocate one and fill it by parsing + * device tree node. + */ pdata = pdev->dev.platform_data; +#if defined(CONFIG_OF) + if (!pdata) { + pdata = tegra_ehci_parse_dt_node(dn, pdev); + + pdev->dev.dma_mask = &tegra_ehci_dmamask; + pdev->dev.coherent_dma_mask = tegra_ehci_dmamask; + } +#endif if (!pdata) { dev_err(&pdev->dev, "Platform data missing\n"); return -EINVAL; @@ -625,7 +820,15 @@ static int tegra_ehci_probe(struct platform_device *pdev) clk_enable(tegra->emc_clk); clk_set_rate(tegra->emc_clk, 400000000); + /* + * If there isn't an IORESOURCE_MEM defined in the board file, + * then try to get that information from the device tree node. + */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); +#if defined(CONFIG_OF) + if (!res && (of_address_to_resource(dn, 0, &of_res) == 0)) + res = &of_res; +#endif if (!res) { dev_err(&pdev->dev, "Failed to get I/O memory\n"); err = -ENXIO; @@ -658,7 +861,15 @@ static int tegra_ehci_probe(struct platform_device *pdev) tegra->power_down_on_bus_suspend = pdata->power_down_on_bus_suspend; tegra->ehci = hcd_to_ehci(hcd); + /* + * If there isn't an irq defined in the board file, then try to get + * that information from the device tree node. + */ irq = platform_get_irq(pdev, 0); +#if defined(CONFIG_OF) + if (!irq) + irq = irq_of_parse_and_map(dn, 0); +#endif if (!irq) { dev_err(&pdev->dev, "Failed to get IRQ\n"); err = -ENODEV; @@ -773,6 +984,14 @@ static void tegra_ehci_hcd_shutdown(struct platform_device *pdev) hcd->driver->shutdown(hcd); } +static const struct of_device_id tegra_ehci_of_match[] = { + { + .compatible = "nvidia,tegra20-ehci", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, tegra_ehci_of_match); + static struct platform_driver tegra_ehci_driver = { .probe = tegra_ehci_probe, .remove = tegra_ehci_remove, @@ -783,5 +1002,7 @@ static struct platform_driver tegra_ehci_driver = { .shutdown = tegra_ehci_hcd_shutdown, .driver = { .name = "tegra-ehci", + .owner = THIS_MODULE, + .of_match_table = tegra_ehci_of_match, } }; -- 1.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
