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USB: s3c-hsotg: add support for clock gating

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This patch adds support for clock gating of the HS/OTG block. On S5PV210
otg gating clock is initally disabled so the driver needs to get and
enable it before it can access its registers.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Marek Szyprowski 2010-07-19 16:01:42 +02:00 committed by Greg Kroah-Hartman
parent 1eb838d3e2
commit 31ee04de7e
1 changed files with 17 additions and 3 deletions
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20
drivers/usb/gadget/s3c-hsotg.c
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@ -152,6 +152,7 @@ struct s3c_hsotg {
void __iomem *regs;
struct resource *regs_res;
int irq;
struct clk *clk;
unsigned int dedicated_fifos:1;
@ -3258,13 +3259,20 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
hsotg->dev = dev;
hsotg->plat = plat;
hsotg->clk = clk_get(&pdev->dev, "otg");
if (IS_ERR(hsotg->clk)) {
dev_err(dev, "cannot get otg clock\n");
ret = -EINVAL;
goto err_mem;
}
platform_set_drvdata(pdev, hsotg);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "cannot find register resource 0\n");
ret = -EINVAL;
goto err_mem;
goto err_clk;
}
hsotg->regs_res = request_mem_region(res->start, resource_size(res),
@ -3272,7 +3280,7 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
if (!hsotg->regs_res) {
dev_err(dev, "cannot reserve registers\n");
ret = -ENOENT;
goto err_mem;
goto err_clk;
}
hsotg->regs = ioremap(res->start, resource_size(res));
@ -3325,6 +3333,8 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
/* reset the system */
clk_enable(hsotg->clk);
s3c_hsotg_gate(pdev, true);
s3c_hsotg_otgreset(hsotg);
@ -3348,7 +3358,8 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
err_regs_res:
release_resource(hsotg->regs_res);
kfree(hsotg->regs_res);
err_clk:
clk_put(hsotg->clk);
err_mem:
kfree(hsotg);
return ret;
@ -3370,6 +3381,9 @@ static int __devexit s3c_hsotg_remove(struct platform_device *pdev)
s3c_hsotg_gate(pdev, false);
clk_disable(hsotg->clk);
clk_put(hsotg->clk);
kfree(hsotg);
return 0;
}