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![Viresh Kumar](/assets/img/avatar_default.png)
Currently cpufreq frequency table has two fields: frequency and driver_data. driver_data is only for drivers' internal use and cpufreq core shouldn't use it at all. But with the introduction of BOOST frequencies, this assumption was broken and we started using it as a flag instead. There are two problems due to this: - It is against the description of this field, as driver's data is used by the core now. - if drivers fill it with -3 for any frequency, then those frequencies are never considered by cpufreq core as it is exactly same as value of CPUFREQ_BOOST_FREQ, i.e. ~2. The best way to get this fixed is by creating another field flags which will be used for such flags. This patch does that. Along with that various drivers need modifications due to the change of struct cpufreq_frequency_table. Reviewed-by: Gautham R Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
388 lines
9.2 KiB
C
388 lines
9.2 KiB
C
/*
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* (C) 2001 Dave Jones, Arjan van de ven.
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* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
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*
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* Licensed under the terms of the GNU GPL License version 2.
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* Based upon reverse engineered information, and on Intel documentation
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* for chipsets ICH2-M and ICH3-M.
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*
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* Many thanks to Ducrot Bruno for finding and fixing the last
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* "missing link" for ICH2-M/ICH3-M support, and to Thomas Winkler
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* for extensive testing.
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*
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* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
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*/
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/*********************************************************************
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* SPEEDSTEP - DEFINITIONS *
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*********************************************************************/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/cpufreq.h>
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <asm/cpu_device_id.h>
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#include "speedstep-lib.h"
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/* speedstep_chipset:
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* It is necessary to know which chipset is used. As accesses to
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* this device occur at various places in this module, we need a
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* static struct pci_dev * pointing to that device.
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*/
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static struct pci_dev *speedstep_chipset_dev;
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/* speedstep_processor
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*/
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static enum speedstep_processor speedstep_processor;
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static u32 pmbase;
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/*
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* There are only two frequency states for each processor. Values
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* are in kHz for the time being.
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*/
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static struct cpufreq_frequency_table speedstep_freqs[] = {
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{0, SPEEDSTEP_HIGH, 0},
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{0, SPEEDSTEP_LOW, 0},
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{0, 0, CPUFREQ_TABLE_END},
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};
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/**
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* speedstep_find_register - read the PMBASE address
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*
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* Returns: -ENODEV if no register could be found
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*/
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static int speedstep_find_register(void)
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{
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if (!speedstep_chipset_dev)
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return -ENODEV;
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/* get PMBASE */
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pci_read_config_dword(speedstep_chipset_dev, 0x40, &pmbase);
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if (!(pmbase & 0x01)) {
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printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");
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return -ENODEV;
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}
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pmbase &= 0xFFFFFFFE;
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if (!pmbase) {
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printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");
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return -ENODEV;
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}
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pr_debug("pmbase is 0x%x\n", pmbase);
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return 0;
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}
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/**
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* speedstep_set_state - set the SpeedStep state
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* @state: new processor frequency state (SPEEDSTEP_LOW or SPEEDSTEP_HIGH)
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*
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* Tries to change the SpeedStep state. Can be called from
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* smp_call_function_single.
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*/
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static void speedstep_set_state(unsigned int state)
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{
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u8 pm2_blk;
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u8 value;
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unsigned long flags;
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if (state > 0x1)
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return;
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/* Disable IRQs */
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local_irq_save(flags);
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/* read state */
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value = inb(pmbase + 0x50);
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pr_debug("read at pmbase 0x%x + 0x50 returned 0x%x\n", pmbase, value);
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/* write new state */
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value &= 0xFE;
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value |= state;
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pr_debug("writing 0x%x to pmbase 0x%x + 0x50\n", value, pmbase);
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/* Disable bus master arbitration */
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pm2_blk = inb(pmbase + 0x20);
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pm2_blk |= 0x01;
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outb(pm2_blk, (pmbase + 0x20));
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/* Actual transition */
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outb(value, (pmbase + 0x50));
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/* Restore bus master arbitration */
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pm2_blk &= 0xfe;
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outb(pm2_blk, (pmbase + 0x20));
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/* check if transition was successful */
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value = inb(pmbase + 0x50);
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/* Enable IRQs */
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local_irq_restore(flags);
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pr_debug("read at pmbase 0x%x + 0x50 returned 0x%x\n", pmbase, value);
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if (state == (value & 0x1))
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pr_debug("change to %u MHz succeeded\n",
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speedstep_get_frequency(speedstep_processor) / 1000);
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else
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printk(KERN_ERR "cpufreq: change failed - I/O error\n");
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return;
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}
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/* Wrapper for smp_call_function_single. */
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static void _speedstep_set_state(void *_state)
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{
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speedstep_set_state(*(unsigned int *)_state);
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}
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/**
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* speedstep_activate - activate SpeedStep control in the chipset
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*
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* Tries to activate the SpeedStep status and control registers.
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* Returns -EINVAL on an unsupported chipset, and zero on success.
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*/
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static int speedstep_activate(void)
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{
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u16 value = 0;
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if (!speedstep_chipset_dev)
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return -EINVAL;
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pci_read_config_word(speedstep_chipset_dev, 0x00A0, &value);
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if (!(value & 0x08)) {
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value |= 0x08;
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pr_debug("activating SpeedStep (TM) registers\n");
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pci_write_config_word(speedstep_chipset_dev, 0x00A0, value);
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}
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return 0;
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}
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/**
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* speedstep_detect_chipset - detect the Southbridge which contains SpeedStep logic
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*
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* Detects ICH2-M, ICH3-M and ICH4-M so far. The pci_dev points to
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* the LPC bridge / PM module which contains all power-management
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* functions. Returns the SPEEDSTEP_CHIPSET_-number for the detected
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* chipset, or zero on failure.
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*/
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static unsigned int speedstep_detect_chipset(void)
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{
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speedstep_chipset_dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82801DB_12,
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PCI_ANY_ID, PCI_ANY_ID,
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NULL);
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if (speedstep_chipset_dev)
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return 4; /* 4-M */
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speedstep_chipset_dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82801CA_12,
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PCI_ANY_ID, PCI_ANY_ID,
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NULL);
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if (speedstep_chipset_dev)
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return 3; /* 3-M */
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speedstep_chipset_dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82801BA_10,
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PCI_ANY_ID, PCI_ANY_ID,
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NULL);
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if (speedstep_chipset_dev) {
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/* speedstep.c causes lockups on Dell Inspirons 8000 and
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* 8100 which use a pretty old revision of the 82815
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* host bridge. Abort on these systems.
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*/
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static struct pci_dev *hostbridge;
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hostbridge = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82815_MC,
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PCI_ANY_ID, PCI_ANY_ID,
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NULL);
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if (!hostbridge)
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return 2; /* 2-M */
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if (hostbridge->revision < 5) {
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pr_debug("hostbridge does not support speedstep\n");
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speedstep_chipset_dev = NULL;
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pci_dev_put(hostbridge);
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return 0;
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}
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pci_dev_put(hostbridge);
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return 2; /* 2-M */
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}
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return 0;
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}
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static void get_freq_data(void *_speed)
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{
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unsigned int *speed = _speed;
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*speed = speedstep_get_frequency(speedstep_processor);
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}
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static unsigned int speedstep_get(unsigned int cpu)
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{
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unsigned int speed;
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/* You're supposed to ensure CPU is online. */
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if (smp_call_function_single(cpu, get_freq_data, &speed, 1) != 0)
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BUG();
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pr_debug("detected %u kHz as current frequency\n", speed);
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return speed;
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}
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/**
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* speedstep_target - set a new CPUFreq policy
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* @policy: new policy
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* @index: index of target frequency
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*
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* Sets a new CPUFreq policy.
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*/
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static int speedstep_target(struct cpufreq_policy *policy, unsigned int index)
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{
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unsigned int policy_cpu;
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policy_cpu = cpumask_any_and(policy->cpus, cpu_online_mask);
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smp_call_function_single(policy_cpu, _speedstep_set_state, &index,
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true);
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return 0;
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}
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struct get_freqs {
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struct cpufreq_policy *policy;
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int ret;
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};
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static void get_freqs_on_cpu(void *_get_freqs)
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{
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struct get_freqs *get_freqs = _get_freqs;
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get_freqs->ret =
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speedstep_get_freqs(speedstep_processor,
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&speedstep_freqs[SPEEDSTEP_LOW].frequency,
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&speedstep_freqs[SPEEDSTEP_HIGH].frequency,
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&get_freqs->policy->cpuinfo.transition_latency,
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&speedstep_set_state);
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}
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static int speedstep_cpu_init(struct cpufreq_policy *policy)
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{
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unsigned int policy_cpu;
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struct get_freqs gf;
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/* only run on CPU to be set, or on its sibling */
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#ifdef CONFIG_SMP
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cpumask_copy(policy->cpus, cpu_sibling_mask(policy->cpu));
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#endif
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policy_cpu = cpumask_any_and(policy->cpus, cpu_online_mask);
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/* detect low and high frequency and transition latency */
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gf.policy = policy;
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smp_call_function_single(policy_cpu, get_freqs_on_cpu, &gf, 1);
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if (gf.ret)
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return gf.ret;
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return cpufreq_table_validate_and_show(policy, speedstep_freqs);
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}
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static struct cpufreq_driver speedstep_driver = {
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.name = "speedstep-ich",
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.verify = cpufreq_generic_frequency_table_verify,
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.target_index = speedstep_target,
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.init = speedstep_cpu_init,
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.get = speedstep_get,
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.attr = cpufreq_generic_attr,
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};
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static const struct x86_cpu_id ss_smi_ids[] = {
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{ X86_VENDOR_INTEL, 6, 0xb, },
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{ X86_VENDOR_INTEL, 6, 0x8, },
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{ X86_VENDOR_INTEL, 15, 2 },
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{}
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};
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#if 0
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/* Autoload or not? Do not for now. */
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MODULE_DEVICE_TABLE(x86cpu, ss_smi_ids);
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#endif
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/**
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* speedstep_init - initializes the SpeedStep CPUFreq driver
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*
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* Initializes the SpeedStep support. Returns -ENODEV on unsupported
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* devices, -EINVAL on problems during initiatization, and zero on
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* success.
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*/
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static int __init speedstep_init(void)
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{
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if (!x86_match_cpu(ss_smi_ids))
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return -ENODEV;
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/* detect processor */
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speedstep_processor = speedstep_detect_processor();
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if (!speedstep_processor) {
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pr_debug("Intel(R) SpeedStep(TM) capable processor "
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"not found\n");
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return -ENODEV;
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}
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/* detect chipset */
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if (!speedstep_detect_chipset()) {
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pr_debug("Intel(R) SpeedStep(TM) for this chipset not "
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"(yet) available.\n");
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return -ENODEV;
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}
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/* activate speedstep support */
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if (speedstep_activate()) {
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pci_dev_put(speedstep_chipset_dev);
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return -EINVAL;
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}
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if (speedstep_find_register())
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return -ENODEV;
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return cpufreq_register_driver(&speedstep_driver);
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}
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/**
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* speedstep_exit - unregisters SpeedStep support
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*
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* Unregisters SpeedStep support.
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*/
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static void __exit speedstep_exit(void)
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{
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pci_dev_put(speedstep_chipset_dev);
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cpufreq_unregister_driver(&speedstep_driver);
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}
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MODULE_AUTHOR("Dave Jones <davej@redhat.com>, "
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"Dominik Brodowski <linux@brodo.de>");
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MODULE_DESCRIPTION("Speedstep driver for Intel mobile processors on chipsets "
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"with ICH-M southbridges.");
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MODULE_LICENSE("GPL");
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module_init(speedstep_init);
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module_exit(speedstep_exit);
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