+++ /dev/null
-From 49ff47db168655cac5213cf5dd1844b08fb9823c Mon Sep 17 00:00:00 2001
-From: Hans de Goede <hdegoede@redhat.com>
-Date: Sun, 5 Jan 2014 14:42:39 +0100
-Subject: [PATCH] ohci-platform: Add support for devicetree instantiation
-
-Add support for ohci-platform instantiation from devicetree, including
-optionally getting clks and a phy from devicetree, and enabling / disabling
-those on power_on / off.
-
-This should allow using ohci-platform from devicetree in various cases.
-Specifically after this commit it can be used for the ohci controller found
-on Allwinner sunxi SoCs.
-
-Signed-off-by: Hans de Goede <hdegoede@redhat.com>
-Acked-by: Alan Stern <stern@rowland.harvard.edu>
----
- Documentation/devicetree/bindings/usb/usb-ohci.txt | 22 +++
- drivers/usb/host/ohci-platform.c | 162 ++++++++++++++++++---
- 2 files changed, 162 insertions(+), 22 deletions(-)
- create mode 100644 Documentation/devicetree/bindings/usb/usb-ohci.txt
-
---- /dev/null
-+++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
-@@ -0,0 +1,25 @@
-+USB OHCI controllers
-+
-+Required properties:
-+- compatible : "generic-ohci"
-+- reg : ohci controller register range (address and length)
-+- interrupts : ohci controller interrupt
-+
-+Optional properties:
-+- big-endian-regs : boolean, set this for hcds with big-endian registers
-+- big-endian-desc : boolean, set this for hcds with big-endian descriptors
-+- big-endian : boolean, for hcds with big-endian-regs + big-endian-desc
-+- 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", "generic-ohci";
-+ reg = <0x01c14400 0x100>;
-+ interrupts = <64>;
-+ clocks = <&usb_clk 6>, <&ahb_gates 2>;
-+ phys = <&usbphy 1>;
-+ phy-names = "usb";
-+ };
---- 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 us
- 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 +127,24 @@ static int ohci_platform_probe(struct pl
- 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;
-+ struct ohci_hcd *ohci;
-+ 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 +157,66 @@ static int ohci_platform_probe(struct pl
- 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);
-+ ohci = hcd_to_ohci(hcd);
-+
-+ if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
-+ if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
-+ ohci->flags |= OHCI_QUIRK_BE_MMIO;
-+
-+ if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
-+ ohci->flags |= OHCI_QUIRK_BE_DESC;
-+
-+ if (of_property_read_bool(dev->dev.of_node, "big-endian"))
-+ ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
-+
-+#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
-+ if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
-+ dev_err(&dev->dev,
-+ "Error big-endian-regs not compiled in\n");
-+ err = -EINVAL;
-+ goto err_put_hcd;
-+ }
-+#endif
-+#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
-+ if (ohci->flags & OHCI_QUIRK_BE_DESC) {
-+ dev_err(&dev->dev,
-+ "Error big-endian-desc not compiled in\n");
-+ err = -EINVAL;
-+ goto err_put_hcd;
-+ }
-+#endif
-+ 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 +225,11 @@ static int ohci_platform_probe(struct pl
- 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 +237,17 @@ static int ohci_platform_probe(struct pl
-
- 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 +256,22 @@ static int ohci_platform_remove(struct p
- {
- 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 +318,12 @@ static int ohci_platform_resume(struct d
- #define ohci_platform_resume NULL
- #endif /* CONFIG_PM */
-
-+static const struct of_device_id ohci_platform_ids[] = {
-+ { .compatible = "generic-ohci", },
-+ { }
-+};
-+MODULE_DEVICE_TABLE(of, ohci_platform_ids);
-+
- static const struct platform_device_id ohci_platform_table[] = {
- { "ohci-platform", 0 },
- { }
-@@ -200,6 +344,7 @@ static struct platform_driver ohci_platf
- .owner = THIS_MODULE,
- .name = "ohci-platform",
- .pm = &ohci_platform_pm_ops,
-+ .of_match_table = ohci_platform_ids,
- }
- };
-
projects / openwrt / openwrt.git / blobdiff