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[CPUFREQ] Move PMBASE reading away and do it only once at initialization time

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This patch moves away PMBASE reading and only performs it at
cpufreq_register_driver time by exiting with -ENODEV if unable to read
the value.

Signed-off-by: Mattia Dongili <malattia@linux.it>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Mattia Dongili 2005-11-30 22:00:59 +01:00 committed by Dave Jones
parent 1a10760c91
commit 9a7d82a89a
1 changed files with 32 additions and 15 deletions
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47
arch/i386/kernel/cpu/cpufreq/speedstep-ich.c
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@ -40,6 +40,7 @@ static struct pci_dev *speedstep_chipset_dev;
*/
static unsigned int speedstep_processor = 0;
static u32 pmbase;
/*
* There are only two frequency states for each processor. Values
@ -55,6 +56,33 @@ static struct cpufreq_frequency_table speedstep_freqs[] = {
#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "speedstep-ich", msg)
/**
* speedstep_find_register - read the PMBASE address
*
* Returns: -ENODEV if no register could be found
*/
static int speedstep_find_register (void)
{
if (!speedstep_chipset_dev)
return -ENODEV;
/* get PMBASE */
pci_read_config_dword(speedstep_chipset_dev, 0x40, &pmbase);
if (!(pmbase & 0x01)) {
printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");
return -ENODEV;
}
pmbase &= 0xFFFFFFFE;
if (!pmbase) {
printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");
return -ENODEV;
}
dprintk("pmbase is 0x%x\n", pmbase);
return 0;
}
/**
* speedstep_set_state - set the SpeedStep state
* @state: new processor frequency state (SPEEDSTEP_LOW or SPEEDSTEP_HIGH)
@ -63,27 +91,13 @@ static struct cpufreq_frequency_table speedstep_freqs[] = {
*/
static void speedstep_set_state (unsigned int state)
{
u32 pmbase;
u8 pm2_blk;
u8 value;
unsigned long flags;
if (!speedstep_chipset_dev || (state > 0x1))
if (state > 0x1)
return;
/* get PMBASE */
pci_read_config_dword(speedstep_chipset_dev, 0x40, &pmbase);
if (!(pmbase & 0x01)) {
printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");
return;
}
pmbase &= 0xFFFFFFFE;
if (!pmbase) {
printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");
return;
}
/* Disable IRQs */
local_irq_save(flags);
@ -400,6 +414,9 @@ static int __init speedstep_init(void)
return -EINVAL;
}
if (speedstep_find_register())
return -ENODEV;
return cpufreq_register_driver(&speedstep_driver);
}