MIPS: Octeon: Update DMA mapping operations for OCTEON II processors.

OCTEON II has a new dma to phys mapping method for PCIe.  Define
OCTEON_DMA_BAR_TYPE_PCIE2 to denote this case, and handle it.

OCTEON II also needs a swiotlb if the OHCI USB driver is enabled, so
allocate this too.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2983/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/cavium-octeon/dma-octeon.c

@@ -61,6 +61,16 @@ static phys_addr_t octeon_gen1_dma_to_phys(struct device *dev, dma_addr_t daddr)
 	return daddr;
 }
 
+static dma_addr_t octeon_gen2_phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	return octeon_hole_phys_to_dma(paddr);
+}
+
+static phys_addr_t octeon_gen2_dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+	return octeon_hole_dma_to_phys(daddr);
+}
+
 static dma_addr_t octeon_big_phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
 	if (paddr >= 0x410000000ull && paddr < 0x420000000ull)
@@ -262,11 +272,11 @@ void __init plat_swiotlb_setup(void)
 
 	for (i = 0 ; i < boot_mem_map.nr_map; i++) {
 		struct boot_mem_map_entry *e = &boot_mem_map.map[i];
-		if (e->type != BOOT_MEM_RAM)
+		if (e->type != BOOT_MEM_RAM && e->type != BOOT_MEM_INIT_RAM)
 			continue;
 
 		/* These addresses map low for PCI. */
-		if (e->addr > 0x410000000ull)
+		if (e->addr > 0x410000000ull && !OCTEON_IS_MODEL(OCTEON_CN6XXX))
 			continue;
 
 		addr_size += e->size;
@@ -295,6 +305,11 @@ void __init plat_swiotlb_setup(void)
 		 */
 		swiotlbsize = 64 * (1<<20);
 	}
+#endif
+#ifdef CONFIG_USB_OCTEON_OHCI
+	/* OCTEON II ohci is only 32-bit. */
+	if (OCTEON_IS_MODEL(OCTEON_CN6XXX) && max_addr >= 0x100000000ul)
+		swiotlbsize = 64 * (1<<20);
 #endif
 	swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
 	swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
@@ -330,6 +345,10 @@ struct dma_map_ops *octeon_pci_dma_map_ops;
 void __init octeon_pci_dma_init(void)
 {
 	switch (octeon_dma_bar_type) {
+	case OCTEON_DMA_BAR_TYPE_PCIE2:
+		_octeon_pci_dma_map_ops.phys_to_dma = octeon_gen2_phys_to_dma;
+		_octeon_pci_dma_map_ops.dma_to_phys = octeon_gen2_dma_to_phys;
+		break;
 	case OCTEON_DMA_BAR_TYPE_PCIE:
 		_octeon_pci_dma_map_ops.phys_to_dma = octeon_gen1_phys_to_dma;
 		_octeon_pci_dma_map_ops.dma_to_phys = octeon_gen1_dma_to_phys;

arch/mips/include/asm/octeon/pci-octeon.h

@@ -56,7 +56,8 @@ enum octeon_dma_bar_type {
 	OCTEON_DMA_BAR_TYPE_INVALID,
 	OCTEON_DMA_BAR_TYPE_SMALL,
 	OCTEON_DMA_BAR_TYPE_BIG,
-	OCTEON_DMA_BAR_TYPE_PCIE
+	OCTEON_DMA_BAR_TYPE_PCIE,
+	OCTEON_DMA_BAR_TYPE_PCIE2
 };
 
 /*