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author | Manjunath Goudar <manjunath.goudar@linaro.org> | 2013-04-02 18:24:00 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-08 09:35:22 -0700 |
commit | 7675d6ba436f8439fc524ee0b42dc562cb1bc74e (patch) | |
tree | 96f73354c755b827e473479064f847ff02855764 /drivers/usb/host/ehci-spear.c | |
parent | a76dd463c58efa5dfd72c3dd41f5a76b196f7ab1 (diff) | |
download | op-kernel-dev-7675d6ba436f8439fc524ee0b42dc562cb1bc74e.zip op-kernel-dev-7675d6ba436f8439fc524ee0b42dc562cb1bc74e.tar.gz |
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.c | 115 |
1 files changed, 51 insertions, 64 deletions
diff --git a/drivers/usb/host/ehci-spear.c b/drivers/usb/host/ehci-spear.c index 210bb67..61ecfb3 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"); |