[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.

Fully unify all of the DMA ops so that subordinate bus types to
the DMA operation providers (such as ebus, isa, of_device) can
work transparently.

Basically, we just make sure that for every system device we
create, the dev->archdata 'iommu' and 'stc' fields are filled
in.

Then we have two platform variants of the DMA ops, one for SUN4U which
actually programs the real hardware, and one for SUN4V which makes
hypervisor calls.

This also fixes the crashes in parport_pc on sparc64, reported by
Meelis Roos.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 11 deletions

diff --git a/arch/sparc64/kernel/pci_psycho.c b/arch/sparc64/kernel/pci_psycho.c
index 598393a2df16..b6b4cfea5b5f 100644
--- a/arch/sparc64/kernel/pci_psycho.c
+++ b/arch/sparc64/kernel/pci_psycho.c
@@ -813,16 +813,19 @@ static void psycho_scan_bus(struct pci_pbm_info *pbm)
         psycho_register_error_handlers(pbm);
 }
 
-static void psycho_iommu_init(struct pci_pbm_info *pbm)
+static int psycho_iommu_init(struct pci_pbm_info *pbm)
 {
         struct iommu *iommu = pbm->iommu;
         unsigned long i;
         u64 control;
+        int err;
 
         /* Register addresses. */
         iommu->iommu_control  = pbm->controller_regs + PSYCHO_IOMMU_CONTROL;
         iommu->iommu_tsbbase  = pbm->controller_regs + PSYCHO_IOMMU_TSBBASE;
         iommu->iommu_flush    = pbm->controller_regs + PSYCHO_IOMMU_FLUSH;
+        iommu->iommu_tags     = iommu->iommu_flush + (0xa580UL - 0x0210UL);
+
         /* PSYCHO's IOMMU lacks ctx flushing. */
         iommu->iommu_ctxflush = 0;
 
@@ -845,7 +848,9 @@ static void psycho_iommu_init(struct pci_pbm_info *pbm)
         /* Leave diag mode enabled for full-flushing done
          * in pci_iommu.c
          */
-        pci_iommu_table_init(iommu, IO_TSB_SIZE, 0xc0000000, 0xffffffff);
+        err = iommu_table_init(iommu, IO_TSB_SIZE, 0xc0000000, 0xffffffff);
+        if (err)
+                return err;
 
         psycho_write(pbm->controller_regs + PSYCHO_IOMMU_TSBBASE,
                      __pa(iommu->page_table));
@@ -858,6 +863,8 @@ static void psycho_iommu_init(struct pci_pbm_info *pbm)
         /* If necessary, hook us up for starfire IRQ translations. */
         if (this_is_starfire)
                 starfire_hookup(pbm->portid);
+
+        return 0;
 }
 
 #define PSYCHO_IRQ_RETRY        0x1a00UL
@@ -1031,15 +1038,12 @@ void psycho_init(struct device_node *dp, char *model_name)
         }
 
         p = kzalloc(sizeof(struct pci_controller_info), GFP_ATOMIC);
-        if (!p) {
-                prom_printf("PSYCHO: Fatal memory allocation error.\n");
-                prom_halt();
-        }
+        if (!p)
+                goto fatal_memory_error;
         iommu = kzalloc(sizeof(struct iommu), GFP_ATOMIC);
-        if (!iommu) {
-                prom_printf("PSYCHO: Fatal memory allocation error.\n");
-                prom_halt();
-        }
+        if (!iommu)
+                goto fatal_memory_error;
+
         p->pbm_A.iommu = p->pbm_B.iommu = iommu;
 
         p->pbm_A.portid = upa_portid;
@@ -1062,8 +1066,14 @@ void psycho_init(struct device_node *dp, char *model_name)
 
         psycho_controller_hwinit(&p->pbm_A);
 
-        psycho_iommu_init(&p->pbm_A);
+        if (psycho_iommu_init(&p->pbm_A))
+                goto fatal_memory_error;
 
         is_pbm_a = ((pr_regs[0].phys_addr & 0x6000) == 0x2000);
         psycho_pbm_init(p, dp, is_pbm_a);
+        return;
+
+fatal_memory_error:
+        prom_printf("PSYCHO: Fatal memory allocation error.\n");
+        prom_halt();
 }