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ARM: Orion: EHCI: Add support for enabling clocks

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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
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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;
}