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ARM: Orion: EHCI: Add support for enabling clocks 

Not all platforms support gating the clock, so it is not an error if
the clock does not exist. However, if it does exist, we should
enable/disable it as appropriate.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Andrew Lunn 2012-04-15 12:53:47 +02:00 committed by Mike Turquette
parent eee989902a
commit 8c869edaee
2 changed files with 18 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/mach-kirkwood/common.c
View File

@ -96,7 +96,7 @@ void __init kirkwood_clk_init(void)
ge1 = kirkwood_register_gate("ge1", CGC_BIT_GE1);
sata0 = kirkwood_register_gate("sata0", CGC_BIT_SATA0);
sata1 = kirkwood_register_gate("sata1", CGC_BIT_SATA1);
kirkwood_register_gate("usb0", CGC_BIT_USB0);
usb0 = kirkwood_register_gate("usb0", CGC_BIT_USB0);
kirkwood_register_gate("sdio", CGC_BIT_SDIO);
kirkwood_register_gate("crypto", CGC_BIT_CRYPTO);
kirkwood_register_gate("xor0", CGC_BIT_XOR0);
@ -115,6 +115,7 @@ void __init kirkwood_clk_init(void)
orion_clkdev_add(NULL, "orion_wdt", tclk);
orion_clkdev_add("0", "sata_mv.0", sata0);
orion_clkdev_add("1", "sata_mv.0", sata1);
orion_clkdev_add(NULL, "orion-ehci.0", usb0);
}
/*****************************************************************************

16
drivers/usb/host/ehci-orion.c
View File

@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mbus.h>
#include <linux/clk.h>
#include <plat/ehci-orion.h>
#define rdl(off) __raw_readl(hcd->regs + (off))
@ -198,6 +199,7 @@ static int __devinit ehci_orion_drv_probe(struct platform_device *pdev)
struct resource *res;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct clk *clk;
void __iomem *regs;
int irq, err;
@ -238,6 +240,14 @@ static int __devinit ehci_orion_drv_probe(struct platform_device *pdev)
goto err2;
}
/* Not all platforms can gate the clock, so it is not
an error if the clock does not exists. */
clk = clk_get(&pdev->dev, NULL);
if (!IS_ERR(clk)) {
clk_prepare_enable(clk);
clk_put(clk);
}
hcd = usb_create_hcd(&ehci_orion_hc_driver,
&pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
@ -301,12 +311,18 @@ err1:
static int __exit ehci_orion_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct clk *clk;
usb_remove_hcd(hcd);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
clk = clk_get(&pdev->dev, NULL);
if (!IS_ERR(clk)) {
clk_disable_unprepare(clk);
clk_put(clk);
}
return 0;
}