Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 52 insertions, 0 deletions

diff --git a/arch/mips/pci/fixup-ip32.c b/arch/mips/pci/fixup-ip32.c
new file mode 100644
index 000000000..d091ffc53
--- /dev/null
+++ b/arch/mips/pci/fixup-ip32.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <asm/ip32/ip32_ints.h>
+/*
+ * O2 has up to 5 PCI devices connected into the MACE bridge.  The device
+ * map looks like this:
+ *
+ * 0  aic7xxx 0
+ * 1  aic7xxx 1
+ * 2  expansion slot
+ * 3  N/C
+ * 4  N/C
+ */
+
+#define SCSI0  MACEPCI_SCSI0_IRQ
+#define SCSI1  MACEPCI_SCSI1_IRQ
+#define INTA0  MACEPCI_SLOT0_IRQ
+#define INTA1  MACEPCI_SLOT1_IRQ
+#define INTA2  MACEPCI_SLOT2_IRQ
+#define INTB   MACEPCI_SHARED0_IRQ
+#define INTC   MACEPCI_SHARED1_IRQ
+#define INTD   MACEPCI_SHARED2_IRQ
+static char irq_tab_mace[][5] = {
+      /* Dummy  INT#A  INT#B  INT#C  INT#D */
+        {0,         0,     0,     0,     0}, /* This is placeholder row - never used */
+        {0,     SCSI0, SCSI0, SCSI0, SCSI0},
+        {0,     SCSI1, SCSI1, SCSI1, SCSI1},
+        {0,     INTA0,  INTB,  INTC,  INTD},
+        {0,     INTA1,  INTC,  INTD,  INTB},
+        {0,     INTA2,  INTD,  INTB,  INTC},
+};
+
+
+/*
+ * Given a PCI slot number (a la PCI_SLOT(...)) and the interrupt pin of
+ * the device (1-4 => A-D), tell what irq to use.  Note that we don't
+ * in theory have slots 4 and 5, and we never normally use the shared
+ * irqs.  I suppose a device without a pin A will thank us for doing it
+ * right if there exists such a broken piece of crap.
+ */
+int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+        return irq_tab_mace[slot][pin];
+}
+
+/* Do platform specific device initialization at pci_enable_device() time */
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+        return 0;
+}