x86: add the RDC machine specific reboot fixup

The RDC R-321x SoC needs a reboot fixup which
uses its internal hardware watchdog set to
reset the CPU on next tick.

Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/x86/kernel/reboot_fixups_32.c b/arch/x86/kernel/reboot_fixups_32.c
index f452726c0fe2..dec0b5ec25c2 100644
--- a/arch/x86/kernel/reboot_fixups_32.c
+++ b/arch/x86/kernel/reboot_fixups_32.c
@@ -30,6 +30,19 @@ static void cs5536_warm_reset(struct pci_dev *dev)
         udelay(50); /* shouldn't get here but be safe and spin a while */
 }
 
+static void rdc321x_reset(struct pci_dev *dev)
+{
+        unsigned i;
+        /* Voluntary reset the watchdog timer */
+        outl(0x80003840, 0xCF8);
+        /* Generate a CPU reset on next tick */
+        i = inl(0xCFC);
+        /* Use the minimum timer resolution */
+        i |= 0x1600;
+        outl(i, 0xCFC);
+        outb(1, 0x92);
+}
+
 struct device_fixup {
         unsigned int vendor;
         unsigned int device;
@@ -40,6 +53,7 @@ static struct device_fixup fixups_table[] = {
 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset },
+{ PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_reset },
 };
 
 /*