diff options
| -rw-r--r-- | arch/i386/kernel/cpu/cpufreq/speedstep-ich.c | 43 |
1 files changed, 30 insertions, 13 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-ich.c b/arch/i386/kernel/cpu/cpufreq/speedstep-ich.c index 862e0b5656b..b425cd3d183 100644 --- a/arch/i386/kernel/cpu/cpufreq/speedstep-ich.c +++ b/arch/i386/kernel/cpu/cpufreq/speedstep-ich.c @@ -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 @@ -56,34 +57,47 @@ static struct cpufreq_frequency_table speedstep_freqs[] = { /** - * speedstep_set_state - set the SpeedStep state - * @state: new processor frequency state (SPEEDSTEP_LOW or SPEEDSTEP_HIGH) + * speedstep_find_register - read the PMBASE address * - * Tries to change the SpeedStep state. + * Returns: -ENODEV if no register could be found */ -static void speedstep_set_state (unsigned int state) +static int speedstep_find_register (void) { - u32 pmbase; - u8 pm2_blk; - u8 value; - unsigned long flags; - - if (!speedstep_chipset_dev || (state > 0x1)) - return; + 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; + return -ENODEV; } pmbase &= 0xFFFFFFFE; if (!pmbase) { printk(KERN_ERR "speedstep-ich: could not find speedstep register\n"); - return; + 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) + * + * Tries to change the SpeedStep state. + */ +static void speedstep_set_state (unsigned int state) +{ + u8 pm2_blk; + u8 value; + unsigned long flags; + + if (state > 0x1) + 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); } |