1 files changed, 205 insertions, 0 deletions

diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index 6722469c2633..d769e204f942 100644
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -4,6 +4,8 @@
 #include <linux/pci.h>
 #include <linux/irq.h>
 
+#include <asm/hpet.h>
+
 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
 
 static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
@@ -47,3 +49,206 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7320_MCH,	quir
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7525_MCH,  quirk_intel_irqbalance);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7520_MCH,  quirk_intel_irqbalance);
 #endif
+
+#if defined(CONFIG_HPET_TIMER)
+unsigned long force_hpet_address;
+
+static enum {
+        NONE_FORCE_HPET_RESUME,
+        OLD_ICH_FORCE_HPET_RESUME,
+        ICH_FORCE_HPET_RESUME
+} force_hpet_resume_type;
+
+static void __iomem *rcba_base;
+
+static void ich_force_hpet_resume(void)
+{
+        u32 val;
+
+        if (!force_hpet_address)
+                return;
+
+        if (rcba_base == NULL)
+                BUG();
+
+        /* read the Function Disable register, dword mode only */
+        val = readl(rcba_base + 0x3404);
+        if (!(val & 0x80)) {
+                /* HPET disabled in HPTC. Trying to enable */
+                writel(val | 0x80, rcba_base + 0x3404);
+        }
+
+        val = readl(rcba_base + 0x3404);
+        if (!(val & 0x80))
+                BUG();
+        else
+                printk(KERN_DEBUG "Force enabled HPET at resume\n");
+
+        return;
+}
+
+static void ich_force_enable_hpet(struct pci_dev *dev)
+{
+        u32 val;
+        u32 uninitialized_var(rcba);
+        int err = 0;
+
+        if (hpet_address || force_hpet_address)
+                return;
+
+        pci_read_config_dword(dev, 0xF0, &rcba);
+        rcba &= 0xFFFFC000;
+        if (rcba == 0) {
+                printk(KERN_DEBUG "RCBA disabled. Cannot force enable HPET\n");
+                return;
+        }
+
+        /* use bits 31:14, 16 kB aligned */
+        rcba_base = ioremap_nocache(rcba, 0x4000);
+        if (rcba_base == NULL) {
+                printk(KERN_DEBUG "ioremap failed. Cannot force enable HPET\n");
+                return;
+        }
+
+        /* read the Function Disable register, dword mode only */
+        val = readl(rcba_base + 0x3404);
+
+        if (val & 0x80) {
+                /* HPET is enabled in HPTC. Just not reported by BIOS */
+                val = val & 0x3;
+                force_hpet_address = 0xFED00000 | (val << 12);
+                printk(KERN_DEBUG "Force enabled HPET at base address 0x%lx\n",
+                               force_hpet_address);
+                iounmap(rcba_base);
+                return;
+        }
+
+        /* HPET disabled in HPTC. Trying to enable */
+        writel(val | 0x80, rcba_base + 0x3404);
+
+        val = readl(rcba_base + 0x3404);
+        if (!(val & 0x80)) {
+                err = 1;
+        } else {
+                val = val & 0x3;
+                force_hpet_address = 0xFED00000 | (val << 12);
+        }
+
+        if (err) {
+                force_hpet_address = 0;
+                iounmap(rcba_base);
+                printk(KERN_DEBUG "Failed to force enable HPET\n");
+        } else {
+                force_hpet_resume_type = ICH_FORCE_HPET_RESUME;
+                printk(KERN_DEBUG "Force enabled HPET at base address 0x%lx\n",
+                               force_hpet_address);
+        }
+}
+
+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_1,
+                         ich_force_enable_hpet);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0,
+                         ich_force_enable_hpet);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1,
+                         ich_force_enable_hpet);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31,
+                         ich_force_enable_hpet);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_1,
+                         ich_force_enable_hpet);
+
+
+static struct pci_dev *cached_dev;
+
+static void old_ich_force_hpet_resume(void)
+{
+        u32 val;
+        u32 uninitialized_var(gen_cntl);
+
+        if (!force_hpet_address || !cached_dev)
+                return;
+
+        pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
+        gen_cntl &= (~(0x7 << 15));
+        gen_cntl |= (0x4 << 15);
+
+        pci_write_config_dword(cached_dev, 0xD0, gen_cntl);
+        pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
+        val = gen_cntl >> 15;
+        val &= 0x7;
+        if (val == 0x4)
+                printk(KERN_DEBUG "Force enabled HPET at resume\n");
+        else
+                BUG();
+}
+
+static void old_ich_force_enable_hpet(struct pci_dev *dev)
+{
+        u32 val;
+        u32 uninitialized_var(gen_cntl);
+
+        if (hpet_address || force_hpet_address)
+                return;
+
+        pci_read_config_dword(dev, 0xD0, &gen_cntl);
+        /*
+         * Bit 17 is HPET enable bit.
+         * Bit 16:15 control the HPET base address.
+         */
+        val = gen_cntl >> 15;
+        val &= 0x7;
+        if (val & 0x4) {
+                val &= 0x3;
+                force_hpet_address = 0xFED00000 | (val << 12);
+                printk(KERN_DEBUG "HPET at base address 0x%lx\n",
+                               force_hpet_address);
+                return;
+        }
+
+        /*
+         * HPET is disabled. Trying enabling at FED00000 and check
+         * whether it sticks
+         */
+        gen_cntl &= (~(0x7 << 15));
+        gen_cntl |= (0x4 << 15);
+        pci_write_config_dword(dev, 0xD0, gen_cntl);
+
+        pci_read_config_dword(dev, 0xD0, &gen_cntl);
+
+        val = gen_cntl >> 15;
+        val &= 0x7;
+        if (val & 0x4) {
+                /* HPET is enabled in HPTC. Just not reported by BIOS */
+                val &= 0x3;
+                force_hpet_address = 0xFED00000 | (val << 12);
+                printk(KERN_DEBUG "Force enabled HPET at base address 0x%lx\n",
+                               force_hpet_address);
+                cached_dev = dev;
+                force_hpet_resume_type = OLD_ICH_FORCE_HPET_RESUME;
+                return;
+        }
+
+        printk(KERN_DEBUG "Failed to force enable HPET\n");
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
+                         old_ich_force_enable_hpet);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_12,
+                         old_ich_force_enable_hpet);
+
+void force_hpet_resume(void)
+{
+        switch (force_hpet_resume_type) {
+            case ICH_FORCE_HPET_RESUME:
+                return ich_force_hpet_resume();
+
+            case OLD_ICH_FORCE_HPET_RESUME:
+                return old_ich_force_hpet_resume();
+
+            default:
+                break;
+        }
+}
+
+#endif