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authorManjunath Goudar <manjunath.goudar@linaro.org>2013-04-02 20:24:00 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-08 20:35:22 +0400
commit7675d6ba436f8439fc524ee0b42dc562cb1bc74e (patch)
tree96f73354c755b827e473479064f847ff02855764 /drivers/usb/host/ehci-spear.c
parenta76dd463c58efa5dfd72c3dd41f5a76b196f7ab1 (diff)
downloadlinux-7675d6ba436f8439fc524ee0b42dc562cb1bc74e.tar.xz
USB: EHCI: make ehci-spear a separate driver
Separate the SPEAr host controller driver from ehci-hcd host code so that it can be built as a separate driver module. This work is part of enabling multi-platform kernels on ARM; however, note that other changes are still needed before SPEAr can be booted with a multi-platform kernel, but they are queued in the arm-soc tree for 3.10. With the infrastructure added by Alan Stern in patch 3e0232039 "USB: EHCI: prepare to make ehci-hcd a library module", we can avoid this problem by turning a bus glue into a separate module, as we do here for the SPEAr bus glue. In V4 (arnd): - renamed all 'struct spear_ehci' pointers from 'ehci' to the less ambiguous 'sehci'. - folded trivial spear_start_ehci/spear_stop_ehci functions into callers. - brought back initialization of ehci->caps. In V3: - Detailed commit message added here about why this patch is required. - Eliminated ehci_spear_setup routine because hcd registers can be directly set in the spear_ehci_hcd_drv_probe function. - spear_overrides struct initialized. - Converted to using .extra_priv_size for allocating spear_ehci, and updated all users of that structure. - to_spear_ehci() macro modified for spear_ehci. In V2: - Replaced spear as SPEAr everywhere, leaving functions/variables/config options. Signed-off-by: Deepak Saxena <dsaxena@linaro.org> Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Viresh Kumar <viresh.linux@gmail.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Cc: Shiraz Hashim <shiraz.hashim@st.com> Cc: spear-devel@list.st.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ehci-spear.c')
-rw-r--r--drivers/usb/host/ehci-spear.c115
1 files changed, 51 insertions, 64 deletions
diff --git a/drivers/usb/host/ehci-spear.c b/drivers/usb/host/ehci-spear.c
index 210bb676f22f..61ecfb3d52f5 100644
--- a/drivers/usb/host/ehci-spear.c
+++ b/drivers/usb/host/ehci-spear.c
@@ -1,5 +1,5 @@
/*
-* Driver for EHCI HCD on SPEAR SOC
+* Driver for EHCI HCD on SPEAr SOC
*
* Copyright (C) 2010 ST Micro Electronics,
* Deepak Sikri <deepak.sikri@st.com>
@@ -12,71 +12,30 @@
*/
#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
-struct spear_ehci {
- struct ehci_hcd ehci;
- struct clk *clk;
-};
-
-#define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd)
+#include "ehci.h"
-static void spear_start_ehci(struct spear_ehci *ehci)
-{
- clk_prepare_enable(ehci->clk);
-}
+#define DRIVER_DESC "EHCI SPEAr driver"
-static void spear_stop_ehci(struct spear_ehci *ehci)
-{
- clk_disable_unprepare(ehci->clk);
-}
+static const char hcd_name[] = "SPEAr-ehci";
-static int ehci_spear_setup(struct usb_hcd *hcd)
-{
- struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-
- /* registers start at offset 0x0 */
- ehci->caps = hcd->regs;
+struct spear_ehci {
+ struct clk *clk;
+};
- return ehci_setup(hcd);
-}
+#define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
-static const struct hc_driver ehci_spear_hc_driver = {
- .description = hcd_name,
- .product_desc = "SPEAr EHCI",
- .hcd_priv_size = sizeof(struct spear_ehci),
-
- /* generic hardware linkage */
- .irq = ehci_irq,
- .flags = HCD_MEMORY | HCD_USB2,
-
- /* basic lifecycle operations */
- .reset = ehci_spear_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 struct hc_driver __read_mostly ehci_spear_hc_driver;
#ifdef CONFIG_PM_SLEEP
static int ehci_spear_drv_suspend(struct device *dev)
@@ -104,7 +63,7 @@ static u64 spear_ehci_dma_mask = DMA_BIT_MASK(32);
static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd ;
- struct spear_ehci *ehci;
+ struct spear_ehci *sehci;
struct resource *res;
struct clk *usbh_clk;
const struct hc_driver *driver = &ehci_spear_hc_driver;
@@ -161,10 +120,13 @@ static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
goto err_put_hcd;
}
- ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
- ehci->clk = usbh_clk;
+ sehci = to_spear_ehci(hcd);
+ sehci->clk = usbh_clk;
+
+ /* registers start at offset 0x0 */
+ hcd_to_ehci(hcd)->caps = hcd->regs;
- spear_start_ehci(ehci);
+ clk_prepare_enable(sehci->clk);
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (retval)
goto err_stop_ehci;
@@ -172,7 +134,7 @@ static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
return retval;
err_stop_ehci:
- spear_stop_ehci(ehci);
+ clk_disable_unprepare(sehci->clk);
err_put_hcd:
usb_put_hcd(hcd);
fail:
@@ -184,7 +146,7 @@ fail:
static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
- struct spear_ehci *ehci_p = to_spear_ehci(hcd);
+ struct spear_ehci *sehci = to_spear_ehci(hcd);
if (!hcd)
return 0;
@@ -192,8 +154,8 @@ static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
BUG();
usb_remove_hcd(hcd);
- if (ehci_p->clk)
- spear_stop_ehci(ehci_p);
+ if (sehci->clk)
+ clk_disable_unprepare(sehci->clk);
usb_put_hcd(hcd);
return 0;
@@ -216,4 +178,29 @@ static struct platform_driver spear_ehci_hcd_driver = {
}
};
+static const struct ehci_driver_overrides spear_overrides __initdata = {
+ .extra_priv_size = sizeof(struct spear_ehci),
+};
+
+static int __init ehci_spear_init(void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+
+ ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
+ return platform_driver_register(&spear_ehci_hcd_driver);
+}
+module_init(ehci_spear_init);
+
+static void __exit ehci_spear_cleanup(void)
+{
+ platform_driver_unregister(&spear_ehci_hcd_driver);
+}
+module_exit(ehci_spear_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:spear-ehci");
+MODULE_AUTHOR("Deepak Sikri");
+MODULE_LICENSE("GPL");