On Friday 15 March 2013, Alan Stern wrote:
> On Fri, 15 Mar 2013, Arnd Bergmann wrote:
> > @@ -89,12 +90,17 @@ static int ehci_platform_probe(struct platform_device *dev)
> > return -ENXIO;
> > }
> >
> > - if (pdata->power_on) {
> > + if (pdata && pdata->power_on) {
> > err = pdata->power_on(dev);
> > if (err < 0)
> > return err;
> > }
>
> Instead of adding these tests for non-NULL pdata all over the place,
> you could define a static structure with default settings and store a
> pointer to it if pdata wasn't set initially.
Yes, good idea. Here is a new version. Maybe Alexey or Tony can verify if
that works for them on wm8850. That should be independent of the decision
into which kernel to merge this patch.
Arnd
8<------
>From 016f7ecd1bce61c18d621acf746776491cc8487e Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@xxxxxxxx>
Date: Fri, 15 Feb 2013 23:12:28 +0100
Subject: [PATCH] USB: EHCI: DT support for generic bus glue
This lets us use the ehci-generic driver on platforms without special
requirements for their ehci controllers. In particular, this is true
for the vt8500/wm8x50 platforms, which currently have a separate
driver that causes problems with multiplatform configurations.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Tony Prisk <linux@xxxxxxxxxxxxxxx>
Cc: Alexey Charkov <alchark@xxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/ehci-hcd.c | 5 --
drivers/usb/host/ehci-platform.c | 25 +++--
drivers/usb/host/ehci-vt8500.c | 150 -------------------------------
3 files changed, 19 insertions(+), 161 deletions(-)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index c750d71..9dfcef6 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1292,11 +1292,6 @@ MODULE_LICENSE ("GPL");
#define PLATFORM_DRIVER ehci_octeon_driver
#endif
-#ifdef CONFIG_ARCH_VT8500
-#include "ehci-vt8500.c"
-#define PLATFORM_DRIVER vt8500_ehci_driver
-#endif
-
#ifdef CONFIG_PLAT_SPEAR
#include "ehci-spear.c"
#define PLATFORM_DRIVER spear_ehci_hcd_driver
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index ca75063..e7777af 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -18,11 +18,13 @@
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
+#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/hrtimer.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
@@ -62,22 +64,26 @@ static const struct ehci_driver_overrides platform_overrides __initdata = {
.reset = ehci_platform_reset,
};
+static struct usb_ehci_pdata ehci_platform_defaults;
+
static int ehci_platform_probe(struct platform_device *dev)
{
struct usb_hcd *hcd;
struct resource *res_mem;
- struct usb_ehci_pdata *pdata = dev->dev.platform_data;
+ struct usb_ehci_pdata *pdata;
int irq;
int err = -ENOMEM;
- if (!pdata) {
- WARN_ON(1);
- return -ENODEV;
- }
-
if (usb_disabled())
return -ENODEV;
+ if (!dev->dev.platform_data) {
+ dev->dev.platform_data = &ehci_platform_defaults;
+ dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
+ dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+ }
+ pdata = dev->dev.platform_data;
+
irq = platform_get_irq(dev, 0);
if (irq < 0) {
dev_err(&dev->dev, "no irq provided");
@@ -183,6 +189,12 @@ static int ehci_platform_resume(struct device *dev)
#define ehci_platform_resume NULL
#endif /* CONFIG_PM */
+static const struct of_device_id vt8500_ehci_ids[] = {
+ { .compatible = "via,vt8500-ehci", },
+ { .compatible = "wm,prizm-ehci", },
+ {}
+};
+
static const struct platform_device_id ehci_platform_table[] = {
{ "ehci-platform", 0 },
{ }
@@ -203,6 +215,7 @@ static struct platform_driver ehci_platform_driver = {
.owner = THIS_MODULE,
.name = "ehci-platform",
.pm = &ehci_platform_pm_ops,
+ .of_match_table = of_match_ptr(vt8500_ehci_ids),
}
};
diff --git a/drivers/usb/host/ehci-vt8500.c b/drivers/usb/host/ehci-vt8500.c
deleted file mode 100644
index 7ecf709..0000000
--- a/drivers/usb/host/ehci-vt8500.c
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
- * drivers/usb/host/ehci-vt8500.c
- *
- * Copyright (C) 2010 Alexey Charkov <alchark@xxxxxxxxx>
- *
- * Based on ehci-au1xxx.c
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#include <linux/err.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-
-static const struct hc_driver vt8500_ehci_hc_driver = {
- .description = hcd_name,
- .product_desc = "VT8500 EHCI",
- .hcd_priv_size = sizeof(struct ehci_hcd),
-
- /*
- * generic hardware linkage
- */
- .irq = ehci_irq,
- .flags = HCD_MEMORY | HCD_USB2,
-
- /*
- * basic lifecycle operations
- */
- .reset = ehci_setup,
- .start = ehci_run,
- .stop = ehci_stop,
- .shutdown = ehci_shutdown,
-
- /*
- * managing i/o requests and associated device resources
- */
- .urb_enqueue = ehci_urb_enqueue,
- .urb_dequeue = ehci_urb_dequeue,
- .endpoint_disable = ehci_endpoint_disable,
- .endpoint_reset = ehci_endpoint_reset,
-
- /*
- * scheduling support
- */
- .get_frame_number = ehci_get_frame,
-
- /*
- * root hub support
- */
- .hub_status_data = ehci_hub_status_data,
- .hub_control = ehci_hub_control,
- .bus_suspend = ehci_bus_suspend,
- .bus_resume = ehci_bus_resume,
- .relinquish_port = ehci_relinquish_port,
- .port_handed_over = ehci_port_handed_over,
-
- .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
-};
-
-static u64 vt8500_ehci_dma_mask = DMA_BIT_MASK(32);
-
-static int vt8500_ehci_drv_probe(struct platform_device *pdev)
-{
- struct usb_hcd *hcd;
- struct ehci_hcd *ehci;
- struct resource *res;
- int ret;
-
- if (usb_disabled())
- return -ENODEV;
-
- /*
- * Right now device-tree probed devices don't get dma_mask set.
- * Since shared usb code relies on it, set it here for now.
- * Once we have dma capability bindings this can go away.
- */
- if (!pdev->dev.dma_mask)
- pdev->dev.dma_mask = &vt8500_ehci_dma_mask;
-
- if (pdev->resource[1].flags != IORESOURCE_IRQ) {
- pr_debug("resource[1] is not IORESOURCE_IRQ");
- return -ENOMEM;
- }
- hcd = usb_create_hcd(&vt8500_ehci_hc_driver, &pdev->dev, "VT8500");
- if (!hcd)
- return -ENOMEM;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- hcd->rsrc_start = res->start;
- hcd->rsrc_len = resource_size(res);
-
- hcd->regs = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(hcd->regs)) {
- ret = PTR_ERR(hcd->regs);
- goto err1;
- }
-
- ehci = hcd_to_ehci(hcd);
- ehci->caps = hcd->regs;
-
- ret = usb_add_hcd(hcd, pdev->resource[1].start,
- IRQF_SHARED);
- if (ret == 0) {
- platform_set_drvdata(pdev, hcd);
- return ret;
- }
-
-err1:
- usb_put_hcd(hcd);
- return ret;
-}
-
-static int vt8500_ehci_drv_remove(struct platform_device *pdev)
-{
- struct usb_hcd *hcd = platform_get_drvdata(pdev);
-
- usb_remove_hcd(hcd);
- usb_put_hcd(hcd);
- platform_set_drvdata(pdev, NULL);
-
- return 0;
-}
-
-static const struct of_device_id vt8500_ehci_ids[] = {
- { .compatible = "via,vt8500-ehci", },
- { .compatible = "wm,prizm-ehci", },
- {}
-};
-
-static struct platform_driver vt8500_ehci_driver = {
- .probe = vt8500_ehci_drv_probe,
- .remove = vt8500_ehci_drv_remove,
- .shutdown = usb_hcd_platform_shutdown,
- .driver = {
- .name = "vt8500-ehci",
- .owner = THIS_MODULE,
- .of_match_table = of_match_ptr(vt8500_ehci_ids),
- }
-};
-
-MODULE_ALIAS("platform:vt8500-ehci");
-MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
--
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