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Diffstat (limited to 'arch/x86/kernel/reboot_fixups_32.c')
-rw-r--r--arch/x86/kernel/reboot_fixups_32.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/arch/x86/kernel/reboot_fixups_32.c b/arch/x86/kernel/reboot_fixups_32.c
new file mode 100644
index 00000000000..03e1cce58f4
--- /dev/null
+++ b/arch/x86/kernel/reboot_fixups_32.c
@@ -0,0 +1,68 @@
+/*
+ * linux/arch/i386/kernel/reboot_fixups.c
+ *
+ * This is a good place to put board specific reboot fixups.
+ *
+ * List of supported fixups:
+ * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
+ * geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org>
+ *
+ */
+
+#include <asm/delay.h>
+#include <linux/pci.h>
+#include <asm/reboot_fixups.h>
+#include <asm/msr.h>
+
+static void cs5530a_warm_reset(struct pci_dev *dev)
+{
+ /* writing 1 to the reset control register, 0x44 causes the
+ cs5530a to perform a system warm reset */
+ pci_write_config_byte(dev, 0x44, 0x1);
+ udelay(50); /* shouldn't get here but be safe and spin-a-while */
+ return;
+}
+
+static void cs5536_warm_reset(struct pci_dev *dev)
+{
+ /*
+ * 6.6.2.12 Soft Reset (DIVIL_SOFT_RESET)
+ * writing 1 to the LSB of this MSR causes a hard reset.
+ */
+ wrmsrl(0x51400017, 1ULL);
+ udelay(50); /* shouldn't get here but be safe and spin a while */
+}
+
+struct device_fixup {
+ unsigned int vendor;
+ unsigned int device;
+ void (*reboot_fixup)(struct pci_dev *);
+};
+
+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 },
+};
+
+/*
+ * we see if any fixup is available for our current hardware. if there
+ * is a fixup, we call it and we expect to never return from it. if we
+ * do return, we keep looking and then eventually fall back to the
+ * standard mach_reboot on return.
+ */
+void mach_reboot_fixups(void)
+{
+ struct device_fixup *cur;
+ struct pci_dev *dev;
+ int i;
+
+ for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
+ cur = &(fixups_table[i]);
+ dev = pci_get_device(cur->vendor, cur->device, NULL);
+ if (!dev)
+ continue;
+
+ cur->reboot_fixup(dev);
+ }
+}
+