Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / powerpc / sysdev / grackle.c

diff --git a/kernel/arch/powerpc/sysdev/grackle.c b/kernel/arch/powerpc/sysdev/grackle.c
new file mode 100644 (file)
index 0000000..08abe91
--- /dev/null
+++ b/kernel/arch/powerpc/sysdev/grackle.c
@@ -0,0 +1,66 @@
+/*
+ * Functions for setting up and using a MPC106 northbridge
+ * Extracted from arch/powerpc/platforms/powermac/pci.c.
+ *
+ * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
+ * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/pci-bridge.h>
+#include <asm/grackle.h>
+
+#define GRACKLE_CFA(b, d, o)   (0x80 | ((b) << 8) | ((d) << 16) \
+                                | (((o) & ~3) << 24))
+
+#define GRACKLE_PICR1_STG              0x00000040
+#define GRACKLE_PICR1_LOOPSNOOP                0x00000010
+
+/* N.B. this is called before bridges is initialized, so we can't
+   use grackle_pcibios_{read,write}_config_dword. */
+static inline void grackle_set_stg(struct pci_controller* bp, int enable)
+{
+       unsigned int val;
+
+       out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
+       val = in_le32(bp->cfg_data);
+       val = enable? (val | GRACKLE_PICR1_STG) :
+               (val & ~GRACKLE_PICR1_STG);
+       out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
+       out_le32(bp->cfg_data, val);
+       (void)in_le32(bp->cfg_data);
+}
+
+static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
+{
+       unsigned int val;
+
+       out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
+       val = in_le32(bp->cfg_data);
+       val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) :
+               (val & ~GRACKLE_PICR1_LOOPSNOOP);
+       out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
+       out_le32(bp->cfg_data, val);
+       (void)in_le32(bp->cfg_data);
+}
+
+void __init setup_grackle(struct pci_controller *hose)
+{
+       setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
+       if (of_machine_is_compatible("PowerMac1,1"))
+               pci_add_flags(PCI_REASSIGN_ALL_BUS);
+       if (of_machine_is_compatible("AAPL,PowerBook1998"))
+               grackle_set_loop_snoop(hose, 1);
+#if 0  /* Disabled for now, HW problems ??? */
+       grackle_set_stg(hose, 1);
+#endif
+}