pseries: Convert sPAPR TCEs to use generic IOMMU infrastructure

The pseries platform already contains an IOMMU implementation, since it is
essential for the platform's paravirtualized VIO devices.  This IOMMU
support is currently built into the implementation of the VIO "bus" and
the various VIO devices.

This patch converts this code to make use of the new common IOMMU
infrastructure.

We don't yet handle synchronization of map/unmap callbacks vs. invalidations,
this will require some complex interaction with the kernel and is not a
major concern at this stage.

Cc: Alex Graf <agraf@suse.de>

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/spapr.h

@@ -1,6 +1,7 @@
 #if !defined(__HW_SPAPR_H__)
 #define __HW_SPAPR_H__
 
+#include "dma.h"
 #include "hw/xics.h"
 
 struct VIOsPAPRBus;
@@ -320,4 +321,20 @@ target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
 int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr,
                                  target_phys_addr_t rtas_size);
 
+#define SPAPR_TCE_PAGE_SHIFT   12
+#define SPAPR_TCE_PAGE_SIZE    (1ULL << SPAPR_TCE_PAGE_SHIFT)
+#define SPAPR_TCE_PAGE_MASK    (SPAPR_TCE_PAGE_SIZE - 1)
+
+typedef struct sPAPRTCE {
+    uint64_t tce;
+} sPAPRTCE;
+
+#define SPAPR_VIO_BASE_LIOBN    0x00000000
+
+void spapr_iommu_init(void);
+DMAContext *spapr_tce_new_dma_context(uint32_t liobn, size_t window_size);
+void spapr_tce_free(DMAContext *dma);
+int spapr_dma_dt(void *fdt, int node_off, const char *propname,
+                 DMAContext *dma);
+
 #endif /* !defined (__HW_SPAPR_H__) */