diff options
Diffstat (limited to 'arch/i386/kernel/cpu/cpufreq/longhaul.c')
| -rw-r--r-- | arch/i386/kernel/cpu/cpufreq/longhaul.c | 86 |
1 files changed, 64 insertions, 22 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/longhaul.c b/arch/i386/kernel/cpu/cpufreq/longhaul.c index 4f2c3ae..83a8793 100644 --- a/arch/i386/kernel/cpu/cpufreq/longhaul.c +++ b/arch/i386/kernel/cpu/cpufreq/longhaul.c @@ -27,6 +27,7 @@ #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/cpufreq.h> +#include <linux/pci.h> #include <linux/slab.h> #include <linux/string.h> @@ -60,6 +61,7 @@ static int can_scale_voltage; static int vrmrev; static struct acpi_processor *pr = NULL; static struct acpi_processor_cx *cx = NULL; +static int port22_en = 0; /* Module parameters */ static int dont_scale_voltage; @@ -124,10 +126,9 @@ static int longhaul_get_cpu_mult(void) /* For processor with BCR2 MSR */ -static void do_longhaul1(int cx_address, unsigned int clock_ratio_index) +static void do_longhaul1(unsigned int clock_ratio_index) { union msr_bcr2 bcr2; - u32 t; rdmsrl(MSR_VIA_BCR2, bcr2.val); /* Enable software clock multiplier */ @@ -136,13 +137,11 @@ static void do_longhaul1(int cx_address, unsigned int clock_ratio_index) /* Sync to timer tick */ safe_halt(); - ACPI_FLUSH_CPU_CACHE(); /* Change frequency on next halt or sleep */ wrmsrl(MSR_VIA_BCR2, bcr2.val); - /* Invoke C3 */ - inb(cx_address); - /* Dummy op - must do something useless after P_LVL3 read */ - t = inl(acpi_fadt.xpm_tmr_blk.address); + /* Invoke transition */ + ACPI_FLUSH_CPU_CACHE(); + halt(); /* Disable software clock multiplier */ local_irq_disable(); @@ -166,9 +165,9 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index) /* Sync to timer tick */ safe_halt(); - ACPI_FLUSH_CPU_CACHE(); /* Change frequency on next halt or sleep */ wrmsrl(MSR_VIA_LONGHAUL, longhaul.val); + ACPI_FLUSH_CPU_CACHE(); /* Invoke C3 */ inb(cx_address); /* Dummy op - must do something useless after P_LVL3 read */ @@ -227,10 +226,13 @@ static void longhaul_setstate(unsigned int clock_ratio_index) outb(0xFF,0xA1); /* Overkill */ outb(0xFE,0x21); /* TMR0 only */ - /* Disable bus master arbitration */ - if (pr->flags.bm_check) { + if (pr->flags.bm_control) { + /* Disable bus master arbitration */ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, ACPI_MTX_DO_NOT_LOCK); + } else if (port22_en) { + /* Disable AGP and PCI arbiters */ + outb(3, 0x22); } switch (longhaul_version) { @@ -244,7 +246,7 @@ static void longhaul_setstate(unsigned int clock_ratio_index) */ case TYPE_LONGHAUL_V1: case TYPE_LONGHAUL_V2: - do_longhaul1(cx->address, clock_ratio_index); + do_longhaul1(clock_ratio_index); break; /* @@ -259,14 +261,20 @@ static void longhaul_setstate(unsigned int clock_ratio_index) * to work in practice. */ case TYPE_POWERSAVER: + /* Don't allow wakeup */ + acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, + ACPI_MTX_DO_NOT_LOCK); do_powersaver(cx->address, clock_ratio_index); break; } - /* Enable bus master arbitration */ - if (pr->flags.bm_check) { + if (pr->flags.bm_control) { + /* Enable bus master arbitration */ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, ACPI_MTX_DO_NOT_LOCK); + } else if (port22_en) { + /* Enable arbiters */ + outb(0, 0x22); } outb(pic2_mask,0xA1); /* restore mask */ @@ -540,21 +548,33 @@ static acpi_status longhaul_walk_callback(acpi_handle obj_handle, return 1; } +/* VIA don't support PM2 reg, but have something similar */ +static int enable_arbiter_disable(void) +{ + struct pci_dev *dev; + u8 pci_cmd; + + /* Find PLE133 host bridge */ + dev = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8601_0, NULL); + if (dev != NULL) { + /* Enable access to port 0x22 */ + pci_read_config_byte(dev, 0x78, &pci_cmd); + if ( !(pci_cmd & 1<<7) ) { + pci_cmd |= 1<<7; + pci_write_config_byte(dev, 0x78, pci_cmd); + } + return 1; + } + return 0; +} + static int __init longhaul_cpu_init(struct cpufreq_policy *policy) { struct cpuinfo_x86 *c = cpu_data; char *cpuname=NULL; int ret; - /* Check ACPI support for C3 state */ - acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, - &longhaul_walk_callback, NULL, (void *)&pr); - if (pr == NULL) goto err_acpi; - - cx = &pr->power.states[ACPI_STATE_C3]; - if (cx->address == 0 || cx->latency > 1000) goto err_acpi; - - /* Now check what we have on this motherboard */ + /* Check what we have on this motherboard */ switch (c->x86_model) { case 6: cpu_model = CPU_SAMUEL; @@ -636,6 +656,28 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy) break; }; + /* Find ACPI data for processor */ + acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, + &longhaul_walk_callback, NULL, (void *)&pr); + if (pr == NULL) + goto err_acpi; + + if (longhaul_version == TYPE_POWERSAVER) { + /* Check ACPI support for C3 state */ + cx = &pr->power.states[ACPI_STATE_C3]; + if (cx->address == 0 || cx->latency > 1000) + goto err_acpi; + } else { + /* Check ACPI support for bus master arbiter disable */ + if (!pr->flags.bm_control) { + if (!enable_arbiter_disable()) { + printk(KERN_ERR PFX "No ACPI support. No VT8601 host bridge. Aborting.\n"); + return -ENODEV; + } else + port22_en = 1; + } + } + ret = longhaul_get_ranges(); if (ret != 0) return ret; |
