forked from Minki/linux
[CPUFREQ] Longhaul - Add VT8235 support
I don't know why it is working and how, but it is working. On my Epia transition time is by default set to 100us. I'm changing it to 200us. After that I can change frequency from min (x4.0) to max (x7.5) without lockup. Many times. There is a paranoid check at a beginning of a patch. Probably dead code, but I don't have better ideas for CL10000 case at the moment. Only way to to detect broken chip seems to be looking in log for spurious interrupts. Signed-off-by: Rafal Bilski <rafalbilski@interia.pl> Signed-off-by: Dave Jones <davej@redhat.com>
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@ -56,6 +56,7 @@
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/* Flags */
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#define USE_ACPI_C3 (1 << 1)
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#define USE_NORTHBRIDGE (1 << 2)
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#define USE_VT8235 (1 << 3)
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static int cpu_model;
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static unsigned int numscales=16;
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@ -544,20 +545,50 @@ static int enable_arbiter_disable(void)
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if (dev != NULL) {
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/* Enable access to port 0x22 */
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pci_read_config_byte(dev, reg, &pci_cmd);
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if ( !(pci_cmd & 1<<7) ) {
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if (!(pci_cmd & 1<<7)) {
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pci_cmd |= 1<<7;
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pci_write_config_byte(dev, reg, pci_cmd);
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pci_read_config_byte(dev, reg, &pci_cmd);
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if (!(pci_cmd & 1<<7)) {
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printk(KERN_ERR PFX
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"Can't enable access to port 0x22.\n");
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return 0;
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}
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}
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return 1;
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}
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return 0;
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}
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static int longhaul_setup_vt8235(void)
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{
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struct pci_dev *dev;
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u8 pci_cmd;
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/* Find VT8235 southbridge */
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dev = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235, NULL);
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if (dev != NULL) {
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/* Set transition time to max */
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pci_read_config_byte(dev, 0xec, &pci_cmd);
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pci_cmd &= ~(1 << 2);
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pci_write_config_byte(dev, 0xec, pci_cmd);
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pci_read_config_byte(dev, 0xe4, &pci_cmd);
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pci_cmd &= ~(1 << 7);
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pci_write_config_byte(dev, 0xe4, pci_cmd);
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pci_read_config_byte(dev, 0xe5, &pci_cmd);
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pci_cmd |= 1 << 7;
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pci_write_config_byte(dev, 0xe5, pci_cmd);
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return 1;
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}
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return 0;
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}
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static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
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{
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struct cpuinfo_x86 *c = cpu_data;
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char *cpuname=NULL;
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int ret;
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int vt8235_present;
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/* Check what we have on this motherboard */
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switch (c->x86_model) {
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@ -641,12 +672,16 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
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break;
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};
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/* Doesn't hurt */
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vt8235_present = longhaul_setup_vt8235();
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/* Find ACPI data for processor */
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acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
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&longhaul_walk_callback, NULL, (void *)&pr);
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acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, &longhaul_walk_callback,
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NULL, (void *)&pr);
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/* Check ACPI support for C3 state */
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if ((pr != NULL) && (longhaul_version == TYPE_POWERSAVER)) {
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if (pr != NULL && longhaul_version == TYPE_POWERSAVER) {
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cx = &pr->power.states[ACPI_STATE_C3];
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if (cx->address > 0 && cx->latency <= 1000) {
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longhaul_flags |= USE_ACPI_C3;
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@ -658,8 +693,11 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
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longhaul_flags |= USE_NORTHBRIDGE;
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goto print_support_type;
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}
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/* No ACPI C3 or we can't use it */
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/* Use VT8235 southbridge if present */
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if (longhaul_version == TYPE_POWERSAVER && vt8235_present) {
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longhaul_flags |= USE_VT8235;
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goto print_support_type;
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}
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/* Check ACPI support for bus master arbiter disable */
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if ((pr == NULL) || !(pr->flags.bm_control)) {
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printk(KERN_ERR PFX
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@ -668,18 +706,18 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
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}
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print_support_type:
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if (!(longhaul_flags & USE_NORTHBRIDGE)) {
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printk (KERN_INFO PFX "Using ACPI support.\n");
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} else {
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if (longhaul_flags & USE_NORTHBRIDGE)
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printk (KERN_INFO PFX "Using northbridge support.\n");
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}
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else if (longhaul_flags & USE_VT8235)
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printk (KERN_INFO PFX "Using VT8235 support.\n");
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else
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printk (KERN_INFO PFX "Using ACPI support.\n");
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ret = longhaul_get_ranges();
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if (ret != 0)
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return ret;
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if ((longhaul_version==TYPE_LONGHAUL_V2 || longhaul_version==TYPE_POWERSAVER) &&
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(scale_voltage != 0))
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if ((longhaul_version != TYPE_LONGHAUL_V1) && (scale_voltage != 0))
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longhaul_setup_voltagescaling();
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policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
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