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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede
Greg Kroah-Hartman
parent
31c6bf7095
commit
ca52a17ba9
|
|
@ -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";
|
||||
};
|
||||
|
|
@ -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,
|
||||
}
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue