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https://github.com/openwrt/openwrt.git
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323 lines
8.4 KiB
Diff
323 lines
8.4 KiB
Diff
From 6b63b9b2093258541dd79a3ed311cd1d0412b846 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Sun, 5 Jan 2014 14:42:39 +0100
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Subject: [PATCH] ohci-platform: Add support for devicetree instantiation
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Add support for ohci-platform instantiation from devicetree, including
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optionally getting clks and a phy from devicetree, and enabling / disabling
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those on power_on / off.
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This should allow using ohci-platform from devicetree in various cases.
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Specifically after this commit it can be used for the ohci controller found
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on Allwinner sunxi SoCs.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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Acked-by: Alan Stern <stern@rowland.harvard.edu>
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---
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Documentation/devicetree/bindings/usb/usb-ohci.txt | 22 +++
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drivers/usb/host/ohci-platform.c | 162 ++++++++++++++++++---
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2 files changed, 162 insertions(+), 22 deletions(-)
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create mode 100644 Documentation/devicetree/bindings/usb/usb-ohci.txt
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diff --git a/Documentation/devicetree/bindings/usb/usb-ohci.txt b/Documentation/devicetree/bindings/usb/usb-ohci.txt
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new file mode 100644
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index 0000000..6ba38d9
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
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@@ -0,0 +1,22 @@
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+USB OHCI controllers
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+
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+Required properties:
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+- compatible : "usb-ohci"
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+- reg : ohci controller register range (address and length)
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+- interrupts : ohci controller interrupt
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+
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+Optional properties:
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+- clocks : a list of phandle + clock specifier pairs
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+- phys : phandle + phy specifier pair
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+- phy-names : "usb"
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+
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+Example:
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+
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+ ohci0: usb@01c14400 {
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+ compatible = "allwinner,sun4i-a10-ohci", "usb-ohci";
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+ reg = <0x01c14400 0x100>;
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+ interrupts = <64>;
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+ clocks = <&usb_clk 6>, <&ahb_gates 2>;
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+ phys = <&usbphy 1>;
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+ phy-names = "usb";
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+ };
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diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
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index 68f674c..49304dd 100644
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--- a/drivers/usb/host/ohci-platform.c
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+++ b/drivers/usb/host/ohci-platform.c
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@@ -3,6 +3,7 @@
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*
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* Copyright 2007 Michael Buesch <m@bues.ch>
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* Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
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+ * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
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*
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* Derived from the OCHI-SSB driver
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* Derived from the OHCI-PCI driver
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@@ -14,11 +15,14 @@
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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+#include <linux/clk.h>
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+#include <linux/dma-mapping.h>
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#include <linux/hrtimer.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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+#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/usb/ohci_pdriver.h>
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#include <linux/usb.h>
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@@ -27,6 +31,13 @@
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#include "ohci.h"
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#define DRIVER_DESC "OHCI generic platform driver"
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+#define OHCI_MAX_CLKS 3
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+#define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
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+
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+struct ohci_platform_priv {
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+ struct clk *clks[OHCI_MAX_CLKS];
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+ struct phy *phy;
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+};
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static const char hcd_name[] = "ohci-platform";
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@@ -48,11 +59,67 @@ static int ohci_platform_reset(struct usb_hcd *hcd)
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return ohci_setup(hcd);
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}
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+static int ohci_platform_power_on(struct platform_device *dev)
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+{
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+ struct usb_hcd *hcd = platform_get_drvdata(dev);
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+ struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
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+ int clk, ret;
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+
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+ for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
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+ ret = clk_prepare_enable(priv->clks[clk]);
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+ if (ret)
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+ goto err_disable_clks;
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+ }
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+
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+ if (priv->phy) {
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+ ret = phy_init(priv->phy);
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+ if (ret)
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+ goto err_disable_clks;
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+
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+ ret = phy_power_on(priv->phy);
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+ if (ret)
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+ goto err_exit_phy;
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+ }
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+
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+ return 0;
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+
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+err_exit_phy:
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+ phy_exit(priv->phy);
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+err_disable_clks:
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+ while (--clk >= 0)
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+ clk_disable_unprepare(priv->clks[clk]);
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+
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+ return ret;
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+}
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+
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+static void ohci_platform_power_off(struct platform_device *dev)
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+{
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+ struct usb_hcd *hcd = platform_get_drvdata(dev);
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+ struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
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+ int clk;
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+
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+ if (priv->phy) {
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+ phy_power_off(priv->phy);
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+ phy_exit(priv->phy);
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+ }
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+
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+ for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
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+ if (priv->clks[clk])
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+ clk_disable_unprepare(priv->clks[clk]);
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+}
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+
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static struct hc_driver __read_mostly ohci_platform_hc_driver;
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static const struct ohci_driver_overrides platform_overrides __initconst = {
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- .product_desc = "Generic Platform OHCI controller",
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- .reset = ohci_platform_reset,
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+ .product_desc = "Generic Platform OHCI controller",
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+ .reset = ohci_platform_reset,
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+ .extra_priv_size = sizeof(struct ohci_platform_priv),
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+};
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+
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+static struct usb_ohci_pdata ohci_platform_defaults = {
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+ .power_on = ohci_platform_power_on,
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+ .power_suspend = ohci_platform_power_off,
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+ .power_off = ohci_platform_power_off,
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};
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static int ohci_platform_probe(struct platform_device *dev)
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@@ -60,17 +127,23 @@ static int ohci_platform_probe(struct platform_device *dev)
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struct usb_hcd *hcd;
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struct resource *res_mem;
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struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
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- int irq;
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- int err = -ENOMEM;
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-
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- if (!pdata) {
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- WARN_ON(1);
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- return -ENODEV;
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- }
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+ struct ohci_platform_priv *priv;
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+ int err, irq, clk = 0;
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if (usb_disabled())
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return -ENODEV;
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+ /*
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+ * Use reasonable defaults so platforms don't have to provide these
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+ * with DT probing on ARM.
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+ */
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+ if (!pdata)
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+ pdata = &ohci_platform_defaults;
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+
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+ err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
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+ if (err)
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+ return err;
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+
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irq = platform_get_irq(dev, 0);
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if (irq < 0) {
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dev_err(&dev->dev, "no irq provided");
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@@ -83,17 +156,40 @@ static int ohci_platform_probe(struct platform_device *dev)
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return -ENXIO;
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}
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+ hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
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+ dev_name(&dev->dev));
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+ if (!hcd)
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+ return -ENOMEM;
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+
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+ platform_set_drvdata(dev, hcd);
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+ dev->dev.platform_data = pdata;
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+ priv = hcd_to_ohci_priv(hcd);
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+
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+ if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
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+ priv->phy = devm_phy_get(&dev->dev, "usb");
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+ if (IS_ERR(priv->phy)) {
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+ err = PTR_ERR(priv->phy);
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+ if (err == -EPROBE_DEFER)
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+ goto err_put_hcd;
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+ priv->phy = NULL;
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+ }
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+
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+ for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
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+ priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
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+ if (IS_ERR(priv->clks[clk])) {
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+ err = PTR_ERR(priv->clks[clk]);
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+ if (err == -EPROBE_DEFER)
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+ goto err_put_clks;
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+ priv->clks[clk] = NULL;
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+ break;
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+ }
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+ }
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+ }
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+
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if (pdata->power_on) {
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err = pdata->power_on(dev);
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if (err < 0)
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- return err;
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- }
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-
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- hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
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- dev_name(&dev->dev));
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- if (!hcd) {
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- err = -ENOMEM;
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- goto err_power;
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+ goto err_put_clks;
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}
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hcd->rsrc_start = res_mem->start;
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@@ -102,11 +198,11 @@ static int ohci_platform_probe(struct platform_device *dev)
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hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
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if (IS_ERR(hcd->regs)) {
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err = PTR_ERR(hcd->regs);
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- goto err_put_hcd;
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+ goto err_power;
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}
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err = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (err)
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- goto err_put_hcd;
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+ goto err_power;
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device_wakeup_enable(hcd->self.controller);
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@@ -114,11 +210,17 @@ static int ohci_platform_probe(struct platform_device *dev)
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return err;
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-err_put_hcd:
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- usb_put_hcd(hcd);
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err_power:
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if (pdata->power_off)
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pdata->power_off(dev);
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+err_put_clks:
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+ while (--clk >= 0)
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+ clk_put(priv->clks[clk]);
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+err_put_hcd:
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+ if (pdata == &ohci_platform_defaults)
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+ dev->dev.platform_data = NULL;
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+
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+ usb_put_hcd(hcd);
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return err;
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}
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@@ -127,13 +229,22 @@ static int ohci_platform_remove(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
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+ struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
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+ int clk;
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usb_remove_hcd(hcd);
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- usb_put_hcd(hcd);
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if (pdata->power_off)
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pdata->power_off(dev);
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+ for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
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+ clk_put(priv->clks[clk]);
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+
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+ usb_put_hcd(hcd);
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+
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+ if (pdata == &ohci_platform_defaults)
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+ dev->dev.platform_data = NULL;
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+
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return 0;
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}
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@@ -180,6 +291,12 @@ static int ohci_platform_resume(struct device *dev)
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#define ohci_platform_resume NULL
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#endif /* CONFIG_PM */
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+static const struct of_device_id ohci_platform_ids[] = {
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+ { .compatible = "usb-ohci", },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(of, ohci_platform_ids);
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+
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static const struct platform_device_id ohci_platform_table[] = {
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{ "ohci-platform", 0 },
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{ }
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@@ -200,6 +317,7 @@ static int ohci_platform_resume(struct device *dev)
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.owner = THIS_MODULE,
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.name = "ohci-platform",
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.pm = &ohci_platform_pm_ops,
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+ .of_match_table = ohci_platform_ids,
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}
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};
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--
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1.8.5.5
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