Merge branch 'linus' into x86/timers

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 9b5cfcdfc426cc194365020c061c6c0b46e54083..ea230ec69057a67477c0f69ef284a9668893b8a1 100644 (file)
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -17,7 +17,7 @@
 
 /* FSEC = 10^-15
    NSEC = 10^-9 */
-#define FSEC_PER_NSEC  1000000
+#define FSEC_PER_NSEC  1000000L
 
 /*
  * HPET address is set in acpi/boot.c, when an ACPI entry exists
@@ -206,20 +206,19 @@ static void hpet_enable_legacy_int(void)
 
 static void hpet_legacy_clockevent_register(void)
 {
-       uint64_t hpet_freq;
-
        /* Start HPET legacy interrupts */
        hpet_enable_legacy_int();
 
        /*
-        * The period is a femto seconds value. We need to calculate the
-        * scaled math multiplication factor for nanosecond to hpet tick
-        * conversion.
+        * The mult factor is defined as (include/linux/clockchips.h)
+        *  mult/2^shift = cyc/ns (in contrast to ns/cyc in clocksource.h)
+        * hpet_period is in units of femtoseconds (per cycle), so
+        *  mult/2^shift = cyc/ns = 10^6/hpet_period
+        *  mult = (10^6 * 2^shift)/hpet_period
+        *  mult = (FSEC_PER_NSEC << hpet_clockevent.shift)/hpet_period
         */
-       hpet_freq = 1000000000000000ULL;
-       do_div(hpet_freq, hpet_period);
-       hpet_clockevent.mult = div_sc((unsigned long) hpet_freq,
-                                     NSEC_PER_SEC, hpet_clockevent.shift);
+       hpet_clockevent.mult = div_sc((unsigned long) FSEC_PER_NSEC,
+                                     hpet_period, hpet_clockevent.shift);
        /* Calculate the min / max delta */
        hpet_clockevent.max_delta_ns = clockevent_delta2ns(0x7FFFFFFF,
                                                           &hpet_clockevent);
@@ -324,7 +323,7 @@ static struct clocksource clocksource_hpet = {
 
 static int hpet_clocksource_register(void)
 {
-       u64 tmp, start, now;
+       u64 start, now;
        cycle_t t1;
 
        /* Start the counter */
@@ -351,21 +350,15 @@ static int hpet_clocksource_register(void)
                return -ENODEV;
        }
 
-       /* Initialize and register HPET clocksource
-        *
-        * hpet period is in femto seconds per cycle
-        * so we need to convert this to ns/cyc units
-        * approximated by mult/2^shift
-        *
-        *  fsec/cyc * 1nsec/1000000fsec = nsec/cyc = mult/2^shift
-        *  fsec/cyc * 1ns/1000000fsec * 2^shift = mult
-        *  fsec/cyc * 2^shift * 1nsec/1000000fsec = mult
-        *  (fsec/cyc << shift)/1000000 = mult
-        *  (hpet_period << shift)/FSEC_PER_NSEC = mult
+       /*
+        * The definition of mult is (include/linux/clocksource.h)
+        * mult/2^shift = ns/cyc and hpet_period is in units of fsec/cyc
+        * so we first need to convert hpet_period to ns/cyc units:
+        *  mult/2^shift = ns/cyc = hpet_period/10^6
+        *  mult = (hpet_period * 2^shift)/10^6
+        *  mult = (hpet_period << shift)/FSEC_PER_NSEC
         */
-       tmp = (u64)hpet_period << HPET_SHIFT;
-       do_div(tmp, FSEC_PER_NSEC);
-       clocksource_hpet.mult = (u32)tmp;
+       clocksource_hpet.mult = div_sc(hpet_period, FSEC_PER_NSEC, HPET_SHIFT);
 
        clocksource_register(&clocksource_hpet);
 

diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index d89a648fe7109a5121673e08a6c978e5ef62a65d..79bdcd11c66e1b7c72220af7ee9ae388d1bebd20 100644 (file)
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -65,6 +65,7 @@ static enum {
        ICH_FORCE_HPET_RESUME,
        VT8237_FORCE_HPET_RESUME,
        NVIDIA_FORCE_HPET_RESUME,
+       ATI_FORCE_HPET_RESUME,
 } force_hpet_resume_type;
 
 static void __iomem *rcba_base;
@@ -158,6 +159,8 @@ static void ich_force_enable_hpet(struct pci_dev *dev)
 
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0,
                         ich_force_enable_hpet);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0,
+                        ich_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1,
                         ich_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0,
@@ -174,6 +177,12 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_7,
 
 static struct pci_dev *cached_dev;
 
+static void hpet_print_force_info(void)
+{
+       printk(KERN_INFO "HPET not enabled in BIOS. "
+              "You might try hpet=force boot option\n");
+}
+
 static void old_ich_force_hpet_resume(void)
 {
        u32 val;
@@ -253,6 +262,8 @@ static void old_ich_force_enable_hpet_user(struct pci_dev *dev)
 {
        if (hpet_force_user)
                old_ich_force_enable_hpet(dev);
+       else
+               hpet_print_force_info();
 }
 
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
@@ -290,8 +301,13 @@ static void vt8237_force_enable_hpet(struct pci_dev *dev)
 {
        u32 uninitialized_var(val);
 
-       if (!hpet_force_user || hpet_address || force_hpet_address)
+       if (hpet_address || force_hpet_address)
+               return;
+
+       if (!hpet_force_user) {
+               hpet_print_force_info();
                return;
+       }
 
        pci_read_config_dword(dev, 0x68, &val);
        /*
@@ -330,6 +346,36 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235,
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
                         vt8237_force_enable_hpet);
 
+static void ati_force_hpet_resume(void)
+{
+       pci_write_config_dword(cached_dev, 0x14, 0xfed00000);
+       printk(KERN_DEBUG "Force enabled HPET at resume\n");
+}
+
+static void ati_force_enable_hpet(struct pci_dev *dev)
+{
+       u32 uninitialized_var(val);
+
+       if (hpet_address || force_hpet_address)
+               return;
+
+       if (!hpet_force_user) {
+               hpet_print_force_info();
+               return;
+       }
+
+       pci_write_config_dword(dev, 0x14, 0xfed00000);
+       pci_read_config_dword(dev, 0x14, &val);
+       force_hpet_address = val;
+       force_hpet_resume_type = ATI_FORCE_HPET_RESUME;
+       dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
+                  force_hpet_address);
+       cached_dev = dev;
+       return;
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
+                        ati_force_enable_hpet);
+
 /*
  * Undocumented chipset feature taken from LinuxBIOS.
  */
@@ -343,8 +389,13 @@ static void nvidia_force_enable_hpet(struct pci_dev *dev)
 {
        u32 uninitialized_var(val);
 
-       if (!hpet_force_user || hpet_address || force_hpet_address)
+       if (hpet_address || force_hpet_address)
+               return;
+
+       if (!hpet_force_user) {
+               hpet_print_force_info();
                return;
+       }
 
        pci_write_config_dword(dev, 0x44, 0xfed00001);
        pci_read_config_dword(dev, 0x44, &val);
@@ -397,6 +448,9 @@ void force_hpet_resume(void)
        case NVIDIA_FORCE_HPET_RESUME:
                nvidia_force_hpet_resume();
                return;
+       case ATI_FORCE_HPET_RESUME:
+               ati_force_hpet_resume();
+               return;
        default:
                break;
        }

diff --git a/arch/x86/kernel/tsc_32.c b/arch/x86/kernel/tsc_32.c
index 068759db63ddebca0ed5561a1306a302dc38f474..ac8b85e18939ae4c5ad88159112a67d06af7b644 100644 (file)
--- a/arch/x86/kernel/tsc_32.c
+++ b/arch/x86/kernel/tsc_32.c
@@ -283,7 +283,6 @@ core_initcall(cpufreq_tsc);
 
 /* clock source code */
 
-static unsigned long current_tsc_khz;
 static struct clocksource clocksource_tsc;
 
 /*
@@ -441,9 +440,8 @@ void __init tsc_init(void)
 
        unsynchronized_tsc();
        check_geode_tsc_reliable();
-       current_tsc_khz = tsc_khz;
-       clocksource_tsc.mult = clocksource_khz2mult(current_tsc_khz,
-                                                       clocksource_tsc.shift);
+       clocksource_tsc.mult = clocksource_khz2mult(tsc_khz,
+                                                   clocksource_tsc.shift);
        /* lower the rating if we already know its unstable: */
        if (check_tsc_unstable()) {
                clocksource_tsc.rating = 0;

diff --git a/arch/x86/kernel/tsc_64.c b/arch/x86/kernel/tsc_64.c
index 1784b8077a125e20bdc4bc38c85feca0ce01260f..9898fb01edfdba8be913462657fe08e473a8da25 100644 (file)
--- a/arch/x86/kernel/tsc_64.c
+++ b/arch/x86/kernel/tsc_64.c
@@ -242,7 +242,7 @@ void __init tsc_calibrate(void)
        if (hpet) {
                printk(KERN_INFO "TSC calibrated against HPET\n");
                if (hpet2 < hpet1)
-                       hpet2 += 0x100000000;
+                       hpet2 += 0x100000000UL;
                hpet2 -= hpet1;
                tsc1 = (hpet2 * hpet_readl(HPET_PERIOD)) / 1000000;
        } else {