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OpenCloudOS-Kernel
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Merge branch 'clk' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm 

* 'clk' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm:
  ARM: 7131/1: clkdev: Add Common Macro for clk_lookup
  clk: spi-pl022: convert to clk_prepare()/clk_unprepare()
  clk: timer-sp: convert to clk_prepare()/clk_unprepare()
  clk: sa1111: convert to clk_prepare()/clk_unprepare()
  clk: mmci: convert to clk_prepare()/clk_unprepare()
  clk: amba-pl011: convert to clk_prepare()/clk_unprepare()
  clk: amba-pl010: convert to clk_prepare()/clk_unprepare()
  clk: amba-clcd: convert to clk_prepare()/clk_unprepare()
  clk: amba bus: convert to clk_prepare()/clk_unprepare()
  clk: provide prepare/unprepare functions
This commit is contained in:
Linus Torvalds 2011-10-27 08:41:50 +02:00
parent 7e0a6fd5a4 196a57c274
commit 18974369cf
10 changed files with 130 additions and 7 deletions
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9
arch/arm/common/sa1111.c
View File

@ -718,6 +718,10 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
goto err_free;
}
ret = clk_prepare(sachip->clk);
if (ret)
goto err_clkput;
spin_lock_init(&sachip->lock);
sachip->dev = me;
@ -733,7 +737,7 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
sachip->base = ioremap(mem->start, PAGE_SIZE * 2);
if (!sachip->base) {
ret = -ENOMEM;
goto err_clkput;
goto err_clk_unprep;
}
/*
@ -809,6 +813,8 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
err_unmap:
iounmap(sachip->base);
err_clk_unprep:
clk_unprepare(sachip->clk);
err_clkput:
clk_put(sachip->clk);
err_free:
@ -835,6 +841,7 @@ static void __sa1111_remove(struct sa1111 *sachip)
sa1111_writel(0, irqbase + SA1111_WAKEEN1);
clk_disable(sachip->clk);
clk_unprepare(sachip->clk);
if (sachip->irq != NO_IRQ) {
irq_set_chained_handler(sachip->irq, NULL);

9
arch/arm/common/timer-sp.c
View File

@ -41,9 +41,17 @@ static long __init sp804_get_clock_rate(const char *name)
return PTR_ERR(clk);
}
err = clk_prepare(clk);
if (err) {
pr_err("sp804: %s clock failed to prepare: %d\n", name, err);
clk_put(clk);
return err;
}
err = clk_enable(clk);
if (err) {
pr_err("sp804: %s clock failed to enable: %d\n", name, err);
clk_unprepare(clk);
clk_put(clk);
return err;
}
@ -52,6 +60,7 @@ static long __init sp804_get_clock_rate(const char *name)
if (rate < 0) {
pr_err("sp804: %s clock failed to get rate: %ld\n", name, rate);
clk_disable(clk);
clk_unprepare(clk);
clk_put(clk);
}

13
drivers/amba/bus.c
View File

@ -460,9 +460,17 @@ static int amba_get_enable_pclk(struct amba_device *pcdev)
if (IS_ERR(pclk))
return PTR_ERR(pclk);
ret = clk_enable(pclk);
if (ret)
ret = clk_prepare(pclk);
if (ret) {
clk_put(pclk);
return ret;
}
ret = clk_enable(pclk);
if (ret) {
clk_unprepare(pclk);
clk_put(pclk);
}
return ret;
}
@ -472,6 +480,7 @@ static void amba_put_disable_pclk(struct amba_device *pcdev)
struct clk *pclk = pcdev->pclk;
clk_disable(pclk);
clk_unprepare(pclk);
clk_put(pclk);
}

9
drivers/mmc/host/mmci.c
View File

@ -1160,10 +1160,14 @@ static int __devinit mmci_probe(struct amba_device *dev,
goto host_free;
}
ret = clk_enable(host->clk);
ret = clk_prepare(host->clk);
if (ret)
goto clk_free;
ret = clk_enable(host->clk);
if (ret)
goto clk_unprep;
host->plat = plat;
host->variant = variant;
host->mclk = clk_get_rate(host->clk);
@ -1351,6 +1355,8 @@ static int __devinit mmci_probe(struct amba_device *dev,
iounmap(host->base);
clk_disable:
clk_disable(host->clk);
clk_unprep:
clk_unprepare(host->clk);
clk_free:
clk_put(host->clk);
host_free:
@ -1398,6 +1404,7 @@ static int __devexit mmci_remove(struct amba_device *dev)
iounmap(host->base);
clk_disable(host->clk);
clk_unprepare(host->clk);
clk_put(host->clk);
if (host->vcc)

10
drivers/spi/spi-pl022.c
View File

@ -2187,6 +2187,13 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
dev_err(&adev->dev, "could not retrieve SSP/SPI bus clock\n");
goto err_no_clk;
}
status = clk_prepare(pl022->clk);
if (status) {
dev_err(&adev->dev, "could not prepare SSP/SPI bus clock\n");
goto err_clk_prep;
}
/* Disable SSP */
writew((readw(SSP_CR1(pl022->virtbase)) & (~SSP_CR1_MASK_SSE)),
SSP_CR1(pl022->virtbase));
@ -2238,6 +2245,8 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
pl022_dma_remove(pl022);
free_irq(adev->irq[0], pl022);
err_no_irq:
clk_unprepare(pl022->clk);
err_clk_prep:
clk_put(pl022->clk);
err_no_clk:
iounmap(pl022->virtbase);
@ -2271,6 +2280,7 @@ pl022_remove(struct amba_device *adev)
pl022_dma_remove(pl022);
free_irq(adev->irq[0], pl022);
clk_disable(pl022->clk);
clk_unprepare(pl022->clk);
clk_put(pl022->clk);
iounmap(pl022->virtbase);
amba_release_regions(adev);

14
drivers/tty/serial/amba-pl010.c
View File

@ -312,12 +312,16 @@ static int pl010_startup(struct uart_port *port)
struct uart_amba_port *uap = (struct uart_amba_port *)port;
int retval;
retval = clk_prepare(uap->clk);
if (retval)
goto out;
/*
* Try to enable the clock producer.
*/
retval = clk_enable(uap->clk);
if (retval)
goto out;
goto clk_unprep;
uap->port.uartclk = clk_get_rate(uap->clk);
@ -343,6 +347,8 @@ static int pl010_startup(struct uart_port *port)
clk_dis:
clk_disable(uap->clk);
clk_unprep:
clk_unprepare(uap->clk);
out:
return retval;
}
@ -370,6 +376,7 @@ static void pl010_shutdown(struct uart_port *port)
* Shut down the clock producer
*/
clk_disable(uap->clk);
clk_unprepare(uap->clk);
}
static void
@ -626,6 +633,7 @@ static int __init pl010_console_setup(struct console *co, char *options)
int bits = 8;
int parity = 'n';
int flow = 'n';
int ret;
/*
* Check whether an invalid uart number has been specified, and
@ -638,6 +646,10 @@ static int __init pl010_console_setup(struct console *co, char *options)
if (!uap)
return -ENODEV;
ret = clk_prepare(uap->clk);
if (ret)
return ret;
uap->port.uartclk = clk_get_rate(uap->clk);
if (options)

14
drivers/tty/serial/amba-pl011.c
View File

@ -1367,12 +1367,16 @@ static int pl011_startup(struct uart_port *port)
unsigned int cr;
int retval;
retval = clk_prepare(uap->clk);
if (retval)
goto out;
/*
* Try to enable the clock producer.
*/
retval = clk_enable(uap->clk);
if (retval)
goto out;
goto clk_unprep;
uap->port.uartclk = clk_get_rate(uap->clk);
@ -1446,6 +1450,8 @@ static int pl011_startup(struct uart_port *port)
clk_dis:
clk_disable(uap->clk);
clk_unprep:
clk_unprepare(uap->clk);
out:
return retval;
}
@ -1497,6 +1503,7 @@ static void pl011_shutdown(struct uart_port *port)
* Shut down the clock producer
*/
clk_disable(uap->clk);
clk_unprepare(uap->clk);
if (uap->port.dev->platform_data) {
struct amba_pl011_data *plat;
@ -1800,6 +1807,7 @@ static int __init pl011_console_setup(struct console *co, char *options)
int bits = 8;
int parity = 'n';
int flow = 'n';
int ret;
/*
* Check whether an invalid uart number has been specified, and
@ -1812,6 +1820,10 @@ static int __init pl011_console_setup(struct console *co, char *options)
if (!uap)
return -ENODEV;
ret = clk_prepare(uap->clk);
if (ret)
return ret;
if (uap->port.dev->platform_data) {
struct amba_pl011_data *plat;

9
drivers/video/amba-clcd.c
View File

@ -447,6 +447,10 @@ static int clcdfb_register(struct clcd_fb *fb)
goto out;
}
ret = clk_prepare(fb->clk);
if (ret)
goto free_clk;
fb->fb.device = &fb->dev->dev;
fb->fb.fix.mmio_start = fb->dev->res.start;
@ -456,7 +460,7 @@ static int clcdfb_register(struct clcd_fb *fb)
if (!fb->regs) {
printk(KERN_ERR "CLCD: unable to remap registers\n");
ret = -ENOMEM;
goto free_clk;
goto clk_unprep;
}
fb->fb.fbops = &clcdfb_ops;
@ -530,6 +534,8 @@ static int clcdfb_register(struct clcd_fb *fb)
fb_dealloc_cmap(&fb->fb.cmap);
unmap:
iounmap(fb->regs);
clk_unprep:
clk_unprepare(fb->clk);
free_clk:
clk_put(fb->clk);
out:
@ -595,6 +601,7 @@ static int clcdfb_remove(struct amba_device *dev)
if (fb->fb.cmap.len)
fb_dealloc_cmap(&fb->fb.cmap);
iounmap(fb->regs);
clk_unprepare(fb->clk);
clk_put(fb->clk);
fb->board->remove(fb);

43
include/linux/clk.h
View File

@ -11,6 +11,8 @@
#ifndef __LINUX_CLK_H
#define __LINUX_CLK_H
#include <linux/kernel.h>
struct device;
/*
@ -40,12 +42,32 @@ struct clk;
*/
struct clk *clk_get(struct device *dev, const char *id);
/**
* clk_prepare - prepare a clock source
* @clk: clock source
*
* This prepares the clock source for use.
*
* Must not be called from within atomic context.
*/
#ifdef CONFIG_HAVE_CLK_PREPARE
int clk_prepare(struct clk *clk);
#else
static inline int clk_prepare(struct clk *clk)
{
might_sleep();
return 0;
}
#endif
/**
* clk_enable - inform the system when the clock source should be running.
* @clk: clock source
*
* If the clock can not be enabled/disabled, this should return success.
*
* May be called from atomic contexts.
*
* Returns success (0) or negative errno.
*/
int clk_enable(struct clk *clk);
@ -57,6 +79,8 @@ int clk_enable(struct clk *clk);
* Inform the system that a clock source is no longer required by
* a driver and may be shut down.
*
* May be called from atomic contexts.
*
* Implementation detail: if the clock source is shared between
* multiple drivers, clk_enable() calls must be balanced by the
* same number of clk_disable() calls for the clock source to be
@ -64,6 +88,25 @@ int clk_enable(struct clk *clk);
*/
void clk_disable(struct clk *clk);
/**
* clk_unprepare - undo preparation of a clock source
* @clk: clock source
*
* This undoes a previously prepared clock. The caller must balance
* the number of prepare and unprepare calls.
*
* Must not be called from within atomic context.
*/
#ifdef CONFIG_HAVE_CLK_PREPARE
void clk_unprepare(struct clk *clk);
#else
static inline void clk_unprepare(struct clk *clk)
{
might_sleep();
}
#endif
/**
* clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
* This is only valid once the clock source has been enabled.

7
include/linux/clkdev.h
View File

@ -24,6 +24,13 @@ struct clk_lookup {
struct clk *clk;
};
#define CLKDEV_INIT(d, n, c) \
{ \
.dev_id = d, \
.con_id = n, \
.clk = c, \
}
struct clk_lookup *clkdev_alloc(struct clk *clk, const char *con_id,
const char *dev_fmt, ...);