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net/can/mpc52xx_can: refactor clock-get routine 

Merge two functions into one. The result is smaller as they can now share some
variables.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfram Sang 2009-11-16 12:57:50 +00:00 committed by David S. Miller
parent 68bd7422a2
commit 3f158c2532
1 changed files with 16 additions and 29 deletions
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45
drivers/net/can/mscan/mpc52xx_can.c
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@ -38,28 +38,37 @@
static struct of_device_id mpc52xx_cdm_ids[] __devinitdata = {
{ .compatible = "fsl,mpc5200-cdm", },
{ .compatible = "fsl,mpc5200b-cdm", },
{}
};
/*
* Get the frequency of the external oscillator clock connected
* to the SYS_XTAL_IN pin, or return 0 if it cannot be determined.
* Get frequency of the MSCAN clock source
*
* Either the oscillator clock (SYS_XTAL_IN) or the IP bus clock (IP_CLK)
* can be selected. According to the MPC5200 user's manual, the oscillator
* clock is the better choice as it has less jitter but due to a hardware
* bug, it can not be selected for the old MPC5200 Rev. A chips.
*/
static unsigned int __devinit mpc52xx_can_xtal_freq(struct of_device *of)
static unsigned int __devinit mpc52xx_can_clock_freq(struct of_device *of,
int clock_src)
{
unsigned int pvr;
struct mpc52xx_cdm __iomem *cdm;
struct device_node *np_cdm;
unsigned int freq;
u32 val;
pvr = mfspr(SPRN_PVR);
freq = mpc5xxx_get_bus_frequency(of->node);
if (!freq)
return 0;
/*
* Determine SYS_XTAL_IN frequency from the clock domain settings
*/
if (clock_src == MSCAN_CLKSRC_BUS || pvr == 0x80822011)
return freq;
/* Determine SYS_XTAL_IN frequency from the clock domain settings */
np_cdm = of_find_matching_node(NULL, mpc52xx_cdm_ids);
if (!np_cdm) {
dev_err(&of->dev, "can't get clock node!\n");
@ -80,28 +89,6 @@ static unsigned int __devinit mpc52xx_can_xtal_freq(struct of_device *of)
return freq;
}
/*
* Get frequency of the MSCAN clock source
*
* Either the oscillator clock (SYS_XTAL_IN) or the IP bus clock (IP_CLK)
* can be selected. According to the MPC5200 user's manual, the oscillator
* clock is the better choice as it has less jitter but due to a hardware
* bug, it can not be selected for the old MPC5200 Rev. A chips.
*/
static unsigned int __devinit mpc52xx_can_clock_freq(struct of_device *of,
int clock_src)
{
unsigned int pvr;
pvr = mfspr(SPRN_PVR);
if (clock_src == MSCAN_CLKSRC_BUS || pvr == 0x80822011)
return mpc5xxx_get_bus_frequency(of->node);
return mpc52xx_can_xtal_freq(of);
}
static int __devinit mpc5xxx_can_probe(struct of_device *ofdev,
const struct of_device_id *id)
{