diff options
| -rw-r--r-- | Documentation/devicetree/bindings/usb/usb-ohci.txt | 22 | ||||
| -rw-r--r-- | drivers/usb/host/ohci-platform.c | 162 |
2 files changed, 162 insertions, 22 deletions
diff --git a/Documentation/devicetree/bindings/usb/usb-ohci.txt b/Documentation/devicetree/bindings/usb/usb-ohci.txt new file mode 100644 index 000000000000..6ba38d990d16 --- /dev/null +++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt @@ -0,0 +1,22 @@ +USB OHCI controllers + +Required properties: +- compatible : "usb-ohci" +- reg : ohci controller register range (address and length) +- interrupts : ohci controller interrupt + +Optional properties: +- clocks : a list of phandle + clock specifier pairs +- phys : phandle + phy specifier pair +- phy-names : "usb" + +Example: + + ohci0: usb@01c14400 { + compatible = "allwinner,sun4i-a10-ohci", "usb-ohci"; + reg = <0x01c14400 0x100>; + interrupts = <64>; + clocks = <&usb_clk 6>, <&ahb_gates 2>; + phys = <&usbphy 1>; + phy-names = "usb"; + }; diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c index 68f674cd095f..49304ddde422 100644 --- a/drivers/usb/host/ohci-platform.c +++ b/drivers/usb/host/ohci-platform.c @@ -3,6 +3,7 @@ * * Copyright 2007 Michael Buesch <m@bues.ch> * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de> + * Copyright 2014 Hans de Goede <hdegoede@redhat.com> * * Derived from the OCHI-SSB driver * Derived from the OHCI-PCI driver @@ -14,11 +15,14 @@ * Licensed under the GNU/GPL. See COPYING for details. */ +#include <linux/clk.h> +#include <linux/dma-mapping.h> #include <linux/hrtimer.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/err.h> +#include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/usb/ohci_pdriver.h> #include <linux/usb.h> @@ -27,6 +31,13 @@ #include "ohci.h" #define DRIVER_DESC "OHCI generic platform driver" +#define OHCI_MAX_CLKS 3 +#define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv) + +struct ohci_platform_priv { + struct clk *clks[OHCI_MAX_CLKS]; + struct phy *phy; +}; static const char hcd_name[] = "ohci-platform"; @@ -48,11 +59,67 @@ static int ohci_platform_reset(struct usb_hcd *hcd) return ohci_setup(hcd); } +static int ohci_platform_power_on(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); + int clk, ret; + + for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) { + ret = clk_prepare_enable(priv->clks[clk]); + if (ret) + goto err_disable_clks; + } + + if (priv->phy) { + ret = phy_init(priv->phy); + if (ret) + goto err_disable_clks; + + ret = phy_power_on(priv->phy); + if (ret) + goto err_exit_phy; + } + + return 0; + +err_exit_phy: + phy_exit(priv->phy); +err_disable_clks: + while (--clk >= 0) + clk_disable_unprepare(priv->clks[clk]); + + return ret; +} + +static void ohci_platform_power_off(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); + int clk; + + if (priv->phy) { + phy_power_off(priv->phy); + phy_exit(priv->phy); + } + + for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--) + if (priv->clks[clk]) + clk_disable_unprepare(priv->clks[clk]); +} + static struct hc_driver __read_mostly ohci_platform_hc_driver; static const struct ohci_driver_overrides platform_overrides __initconst = { - .product_desc = "Generic Platform OHCI controller", - .reset = ohci_platform_reset, + .product_desc = "Generic Platform OHCI controller", + .reset = ohci_platform_reset, + .extra_priv_size = sizeof(struct ohci_platform_priv), +}; + +static struct usb_ohci_pdata ohci_platform_defaults = { + .power_on = ohci_platform_power_on, + .power_suspend = ohci_platform_power_off, + .power_off = ohci_platform_power_off, }; static int ohci_platform_probe(struct platform_device *dev) @@ -60,17 +127,23 @@ static int ohci_platform_probe(struct platform_device *dev) struct usb_hcd *hcd; struct resource *res_mem; struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev); - int irq; - int err = -ENOMEM; - - if (!pdata) { - WARN_ON(1); - return -ENODEV; - } + struct ohci_platform_priv *priv; + int err, irq, clk = 0; if (usb_disabled()) return -ENODEV; + /* + * Use reasonable defaults so platforms don't have to provide these + * with DT probing on ARM. + */ + if (!pdata) + pdata = &ohci_platform_defaults; + + err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)); + if (err) + return err; + irq = platform_get_irq(dev, 0); if (irq < 0) { dev_err(&dev->dev, "no irq provided"); @@ -83,17 +156,40 @@ static int ohci_platform_probe(struct platform_device *dev) return -ENXIO; } + hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev, + dev_name(&dev->dev)); + if (!hcd) + return -ENOMEM; + + platform_set_drvdata(dev, hcd); + dev->dev.platform_data = pdata; + priv = hcd_to_ohci_priv(hcd); + + if (pdata == &ohci_platform_defaults && dev->dev.of_node) { + priv->phy = devm_phy_get(&dev->dev, "usb"); + if (IS_ERR(priv->phy)) { + err = PTR_ERR(priv->phy); + if (err == -EPROBE_DEFER) + goto err_put_hcd; + priv->phy = NULL; + } + + for (clk = 0; clk < OHCI_MAX_CLKS; clk++) { + priv->clks[clk] = of_clk_get(dev->dev.of_node, clk); + if (IS_ERR(priv->clks[clk])) { + err = PTR_ERR(priv->clks[clk]); + if (err == -EPROBE_DEFER) + goto err_put_clks; + priv->clks[clk] = NULL; + break; + } + } + } + if (pdata->power_on) { err = pdata->power_on(dev); if (err < 0) - return err; - } - - hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev, - dev_name(&dev->dev)); - if (!hcd) { - err = -ENOMEM; - goto err_power; + goto err_put_clks; } hcd->rsrc_start = res_mem->start; @@ -102,11 +198,11 @@ static int ohci_platform_probe(struct platform_device *dev) hcd->regs = devm_ioremap_resource(&dev->dev, res_mem); if (IS_ERR(hcd->regs)) { err = PTR_ERR(hcd->regs); - goto err_put_hcd; + goto err_power; } err = usb_add_hcd(hcd, irq, IRQF_SHARED); if (err) - goto err_put_hcd; + goto err_power; device_wakeup_enable(hcd->self.controller); @@ -114,11 +210,17 @@ static int ohci_platform_probe(struct platform_device *dev) return err; -err_put_hcd: - usb_put_hcd(hcd); err_power: if (pdata->power_off) pdata->power_off(dev); +err_put_clks: + while (--clk >= 0) + clk_put(priv->clks[clk]); +err_put_hcd: + if (pdata == &ohci_platform_defaults) + dev->dev.platform_data = NULL; + + usb_put_hcd(hcd); return err; } @@ -127,13 +229,22 @@ static int ohci_platform_remove(struct platform_device *dev) { struct usb_hcd *hcd = platform_get_drvdata(dev); struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev); + struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); + int clk; usb_remove_hcd(hcd); - usb_put_hcd(hcd); if (pdata->power_off) pdata->power_off(dev); + for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) + clk_put(priv->clks[clk]); + + usb_put_hcd(hcd); + + if (pdata == &ohci_platform_defaults) + dev->dev.platform_data = NULL; + return 0; } @@ -180,6 +291,12 @@ static int ohci_platform_resume(struct device *dev) #define ohci_platform_resume NULL #endif /* CONFIG_PM */ +static const struct of_device_id ohci_platform_ids[] = { + { .compatible = "usb-ohci", }, + { } +}; +MODULE_DEVICE_TABLE(of, ohci_platform_ids); + static const struct platform_device_id ohci_platform_table[] = { { "ohci-platform", 0 }, { } @@ -200,6 +317,7 @@ static struct platform_driver ohci_platform_driver = { .owner = THIS_MODULE, .name = "ohci-platform", .pm = &ohci_platform_pm_ops, + .of_match_table = ohci_platform_ids, } }; |