arch/mips/cavium-octeon/dma-octeon.c - kernel/msm - Gitiles

 /*
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
  * Copyright (C) 2000  Ani Joshi <ajoshi@unixbox.com>
  * Copyright (C) 2000, 2001  Ralf Baechle <ralf@gnu.org>
  * Copyright (C) 2005 Ilya A. Volynets-Evenbakh <ilya@total-knowledge.com>
  * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
  * IP32 changes by Ilya.
  * Cavium Networks: Create new dma setup for Cavium Networks Octeon based on
  * the kernels original.
  */
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
 #include <linux/scatterlist.h>

 #include <linux/cache.h>
 #include <linux/io.h>

 #include <asm/octeon/octeon.h>
 #include <asm/octeon/cvmx-npi-defs.h>
 #include <asm/octeon/cvmx-pci-defs.h>

 #include <dma-coherence.h>

 #ifdef CONFIG_PCI
 #include "pci-common.h"
 #endif

 #define BAR2_PCI_ADDRESS 0x8000000000ul

 struct bar1_index_state {
 	int16_t ref_count;	/* Number of PCI mappings using this index */
 	uint16_t address_bits;	/* Upper bits of physical address. This is
 				   shifted 22 bits */
 };

 #ifdef CONFIG_PCI
 static DEFINE_SPINLOCK(bar1_lock);
 static struct bar1_index_state bar1_state[32];
 #endif

 dma_addr_t octeon_map_dma_mem(struct device *dev, void *ptr, size_t size)
 {
 #ifndef CONFIG_PCI
 	/* Without PCI/PCIe this function can be called for Octeon internal
 	   devices such as USB. These devices all support 64bit addressing */
 	mb();
 	return virt_to_phys(ptr);
 #else
 	unsigned long flags;
 	uint64_t dma_mask;
 	int64_t start_index;
 	dma_addr_t result = -1;
 	uint64_t physical = virt_to_phys(ptr);
 	int64_t index;

 	mb();
 	/*
 	 * Use the DMA masks to determine the allowed memory
 	 * region. For us it doesn't limit the actual memory, just the
 	 * address visible over PCI.  Devices with limits need to use
 	 * lower indexed Bar1 entries.
 	 */
 	if (dev) {
 		dma_mask = dev->coherent_dma_mask;
 		if (dev->dma_mask)
 			dma_mask = *dev->dma_mask;
 	} else {
 		dma_mask = 0xfffffffful;
 	}

 	/*
 	 * Platform devices, such as the internal USB, skip all
 	 * translation and use Octeon physical addresses directly.
 	 */
 	if (!dev || dev->bus == &platform_bus_type)
 		return physical;

 	switch (octeon_dma_bar_type) {
 	case OCTEON_DMA_BAR_TYPE_PCIE:
 		if (unlikely(physical < (16ul << 10)))
 			panic("dma_map_single: Not allowed to map first 16KB."
 			      " It interferes with BAR0 special area\n");
 		else if ((physical + size >= (256ul << 20)) &&
 			 (physical < (512ul << 20)))
 			panic("dma_map_single: Not allowed to map bootbus\n");
 		else if ((physical + size >= 0x400000000ull) &&
 			 physical < 0x410000000ull)
 			panic("dma_map_single: "
 			      "Attempt to map illegal memory address 0x%llx\n",
 			      physical);
 		else if (physical >= 0x420000000ull)
 			panic("dma_map_single: "
 			      "Attempt to map illegal memory address 0x%llx\n",
 			      physical);
 		else if ((physical + size >=
 			  (4ull<<30) - (OCTEON_PCI_BAR1_HOLE_SIZE<<20))
 			 && physical < (4ull<<30))
 			pr_warning("dma_map_single: Warning: "
 				   "Mapping memory address that might "
 				   "conflict with devices 0x%llx-0x%llx\n",
 				   physical, physical+size-1);
 		/* The 2nd 256MB is mapped at 256<<20 instead of 0x410000000 */
 		if ((physical >= 0x410000000ull) && physical < 0x420000000ull)
 			result = physical - 0x400000000ull;
 		else
 			result = physical;
 		if (((result+size-1) & dma_mask) != result+size-1)
 			panic("dma_map_single: Attempt to map address "
 			      "0x%llx-0x%llx, which can't be accessed "
 			      "according to the dma mask 0x%llx\n",
 			      physical, physical+size-1, dma_mask);
 		goto done;

 	case OCTEON_DMA_BAR_TYPE_BIG:
 #ifdef CONFIG_64BIT
 		/* If the device supports 64bit addressing, then use BAR2 */
 		if (dma_mask > BAR2_PCI_ADDRESS) {
 			result = physical + BAR2_PCI_ADDRESS;
 			goto done;
 		}
 #endif
 		if (unlikely(physical < (4ul << 10))) {
 			panic("dma_map_single: Not allowed to map first 4KB. "
 			      "It interferes with BAR0 special area\n");
 		} else if (physical < (256ul << 20)) {
 			if (unlikely(physical + size > (256ul << 20)))
 				panic("dma_map_single: Requested memory spans "
 				      "Bar0 0:256MB and bootbus\n");
 			result = physical;
 			goto done;
 		} else if (unlikely(physical < (512ul << 20))) {
 			panic("dma_map_single: Not allowed to map bootbus\n");
 		} else if (physical < (2ul << 30)) {
 			if (unlikely(physical + size > (2ul << 30)))
 				panic("dma_map_single: Requested memory spans "
 				      "Bar0 512MB:2GB and BAR1\n");
 			result = physical;
 			goto done;
 		} else if (physical < (2ul << 30) + (128 << 20)) {
 			/* Fall through */
 		} else if (physical <
 			   (4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20)) {
 			if (unlikely
 			    (physical + size >
 			     (4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20)))
 				panic("dma_map_single: Requested memory "
 				      "extends past Bar1 (4GB-%luMB)\n",
 				      OCTEON_PCI_BAR1_HOLE_SIZE);
 			result = physical;
 			goto done;
 		} else if ((physical >= 0x410000000ull) &&
 			   (physical < 0x420000000ull)) {
 			if (unlikely(physical + size > 0x420000000ull))
 				panic("dma_map_single: Requested memory spans "
 				      "non existant memory\n");
 			/* BAR0 fixed mapping 256MB:512MB ->
 			 * 16GB+256MB:16GB+512MB */
 			result = physical - 0x400000000ull;
 			goto done;
 		} else {
 			/* Continued below switch statement */
 		}
 		break;

 	case OCTEON_DMA_BAR_TYPE_SMALL:
 #ifdef CONFIG_64BIT
 		/* If the device supports 64bit addressing, then use BAR2 */
 		if (dma_mask > BAR2_PCI_ADDRESS) {
 			result = physical + BAR2_PCI_ADDRESS;
 			goto done;
 		}
 #endif
 		/* Continued below switch statement */
 		break;

 	default:
 		panic("dma_map_single: Invalid octeon_dma_bar_type\n");
 	}

 	/* Don't allow mapping to span multiple Bar entries. The hardware guys
 	   won't guarantee that DMA across boards work */
 	if (unlikely((physical >> 22) != ((physical + size - 1) >> 22)))
 		panic("dma_map_single: "
 		      "Requested memory spans more than one Bar1 entry\n");

 	if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG)
 		start_index = 31;
 	else if (unlikely(dma_mask < (1ul << 27)))
 		start_index = (dma_mask >> 22);
 	else
 		start_index = 31;

 	/* Only one processor can access the Bar register at once */
 	spin_lock_irqsave(&bar1_lock, flags);

 	/* Look through Bar1 for existing mapping that will work */
 	for (index = start_index; index >= 0; index--) {
 		if ((bar1_state[index].address_bits == physical >> 22) &&
 		    (bar1_state[index].ref_count)) {
 			/* An existing mapping will work, use it */
 			bar1_state[index].ref_count++;
 			if (unlikely(bar1_state[index].ref_count < 0))
 				panic("dma_map_single: "
 				      "Bar1[%d] reference count overflowed\n",
 				      (int) index);
 			result = (index << 22) | (physical & ((1 << 22) - 1));
 			/* Large BAR1 is offset at 2GB */
 			if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG)
 				result += 2ul << 30;
 			goto done_unlock;
 		}
 	}

 	/* No existing mappings, look for a free entry */
 	for (index = start_index; index >= 0; index--) {
 		if (unlikely(bar1_state[index].ref_count == 0)) {
 			union cvmx_pci_bar1_indexx bar1_index;
 			/* We have a free entry, use it */
 			bar1_state[index].ref_count = 1;
 			bar1_state[index].address_bits = physical >> 22;
 			bar1_index.u32 = 0;
 			/* Address bits[35:22] sent to L2C */
 			bar1_index.s.addr_idx = physical >> 22;
 			/* Don't put PCI accesses in L2. */
 			bar1_index.s.ca = 1;
 			/* Endian Swap Mode */
 			bar1_index.s.end_swp = 1;
 			/* Set '1' when the selected address range is valid. */
 			bar1_index.s.addr_v = 1;
 			octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index),
 					   bar1_index.u32);
 			/* An existing mapping will work, use it */
 			result = (index << 22) | (physical & ((1 << 22) - 1));
 			/* Large BAR1 is offset at 2GB */
 			if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG)
 				result += 2ul << 30;
 			goto done_unlock;
 		}
 	}

 	pr_err("dma_map_single: "
 	       "Can't find empty BAR1 index for physical mapping 0x%llx\n",
 	       (unsigned long long) physical);

 done_unlock:
 	spin_unlock_irqrestore(&bar1_lock, flags);
 done:
 	pr_debug("dma_map_single 0x%llx->0x%llx\n", physical, result);
 	return result;
 #endif
 }

 void octeon_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr)
 {
 #ifndef CONFIG_PCI
 	/*
 	 * Without PCI/PCIe this function can be called for Octeon internal
 	 * devices such as USB. These devices all support 64bit addressing.
 	 */
 	return;
 #else
 	unsigned long flags;
 	uint64_t index;

 	/*
 	 * Platform devices, such as the internal USB, skip all
 	 * translation and use Octeon physical addresses directly.
 	 */
 	if (dev->bus == &platform_bus_type)
 		return;

 	switch (octeon_dma_bar_type) {
 	case OCTEON_DMA_BAR_TYPE_PCIE:
 		/* Nothing to do, all mappings are static */
 		goto done;

 	case OCTEON_DMA_BAR_TYPE_BIG:
 #ifdef CONFIG_64BIT
 		/* Nothing to do for addresses using BAR2 */
 		if (dma_addr >= BAR2_PCI_ADDRESS)
 			goto done;
 #endif
 		if (unlikely(dma_addr < (4ul << 10)))
 			panic("dma_unmap_single: Unexpect DMA address 0x%llx\n",
 			      dma_addr);
 		else if (dma_addr < (2ul << 30))
 			/* Nothing to do for addresses using BAR0 */
 			goto done;
 		else if (dma_addr < (2ul << 30) + (128ul << 20))
 			/* Need to unmap, fall through */
 			index = (dma_addr - (2ul << 30)) >> 22;
 		else if (dma_addr <
 			 (4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20))
 			goto done;	/* Nothing to do for the rest of BAR1 */
 		else
 			panic("dma_unmap_single: Unexpect DMA address 0x%llx\n",
 			      dma_addr);
 		/* Continued below switch statement */
 		break;

 	case OCTEON_DMA_BAR_TYPE_SMALL:
 #ifdef CONFIG_64BIT
 		/* Nothing to do for addresses using BAR2 */
 		if (dma_addr >= BAR2_PCI_ADDRESS)
 			goto done;
 #endif
 		index = dma_addr >> 22;
 		/* Continued below switch statement */
 		break;

 	default:
 		panic("dma_unmap_single: Invalid octeon_dma_bar_type\n");
 	}

 	if (unlikely(index > 31))
 		panic("dma_unmap_single: "
 		      "Attempt to unmap an invalid address (0x%llx)\n",
 		      dma_addr);

 	spin_lock_irqsave(&bar1_lock, flags);
 	bar1_state[index].ref_count--;
 	if (bar1_state[index].ref_count == 0)
 		octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index), 0);
 	else if (unlikely(bar1_state[index].ref_count < 0))
 		panic("dma_unmap_single: Bar1[%u] reference count < 0\n",
 		      (int) index);
 	spin_unlock_irqrestore(&bar1_lock, flags);
 done:
 	pr_debug("dma_unmap_single 0x%llx\n", dma_addr);
 	return;
 #endif
 }
	/*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*
	* Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
	* Copyright (C) 2000, 2001 Ralf Baechle <ralf@gnu.org>
	* Copyright (C) 2005 Ilya A. Volynets-Evenbakh <ilya@total-knowledge.com>
	* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
	* IP32 changes by Ilya.
	* Cavium Networks: Create new dma setup for Cavium Networks Octeon based on
	* the kernels original.
	*/
	#include <linux/types.h>
	#include <linux/mm.h>
	#include <linux/module.h>
	#include <linux/string.h>
	#include <linux/dma-mapping.h>
	#include <linux/platform_device.h>
	#include <linux/scatterlist.h>

	#include <linux/cache.h>
	#include <linux/io.h>

	#include <asm/octeon/octeon.h>
	#include <asm/octeon/cvmx-npi-defs.h>
	#include <asm/octeon/cvmx-pci-defs.h>

	#include <dma-coherence.h>

	#ifdef CONFIG_PCI
	#include "pci-common.h"
	#endif

	#define BAR2_PCI_ADDRESS 0x8000000000ul

	struct bar1_index_state {
	int16_t ref_count; /* Number of PCI mappings using this index */
	uint16_t address_bits; /* Upper bits of physical address. This is
	shifted 22 bits */
	};

	#ifdef CONFIG_PCI
	static DEFINE_SPINLOCK(bar1_lock);
	static struct bar1_index_state bar1_state[32];
	#endif

	dma_addr_t octeon_map_dma_mem(struct device dev, void ptr, size_t size)
	{
	#ifndef CONFIG_PCI
	/* Without PCI/PCIe this function can be called for Octeon internal
	devices such as USB. These devices all support 64bit addressing */
	mb();
	return virt_to_phys(ptr);
	#else
	unsigned long flags;
	uint64_t dma_mask;
	int64_t start_index;
	dma_addr_t result = -1;
	uint64_t physical = virt_to_phys(ptr);
	int64_t index;

	mb();
	/*
	* Use the DMA masks to determine the allowed memory
	* region. For us it doesn't limit the actual memory, just the
	* address visible over PCI. Devices with limits need to use
	* lower indexed Bar1 entries.
	*/
	if (dev) {
	dma_mask = dev->coherent_dma_mask;
	if (dev->dma_mask)
	dma_mask = *dev->dma_mask;
	} else {
	dma_mask = 0xfffffffful;
	}

	/*
	* Platform devices, such as the internal USB, skip all
	* translation and use Octeon physical addresses directly.
	*/
	if (!dev \|\| dev->bus == &platform_bus_type)
	return physical;

	switch (octeon_dma_bar_type) {
	case OCTEON_DMA_BAR_TYPE_PCIE:
	if (unlikely(physical < (16ul << 10)))
	panic("dma_map_single: Not allowed to map first 16KB."
	" It interferes with BAR0 special area\n");
	else if ((physical + size >= (256ul << 20)) &&
	(physical < (512ul << 20)))
	panic("dma_map_single: Not allowed to map bootbus\n");
	else if ((physical + size >= 0x400000000ull) &&
	physical < 0x410000000ull)
	panic("dma_map_single: "
	"Attempt to map illegal memory address 0x%llx\n",
	physical);
	else if (physical >= 0x420000000ull)
	panic("dma_map_single: "
	"Attempt to map illegal memory address 0x%llx\n",
	physical);
	else if ((physical + size >=
	(4ull<<30) - (OCTEON_PCI_BAR1_HOLE_SIZE<<20))
	&& physical < (4ull<<30))
	pr_warning("dma_map_single: Warning: "
	"Mapping memory address that might "
	"conflict with devices 0x%llx-0x%llx\n",
	physical, physical+size-1);
	/* The 2nd 256MB is mapped at 256<<20 instead of 0x410000000 */
	if ((physical >= 0x410000000ull) && physical < 0x420000000ull)
	result = physical - 0x400000000ull;
	else
	result = physical;
	if (((result+size-1) & dma_mask) != result+size-1)
	panic("dma_map_single: Attempt to map address "
	"0x%llx-0x%llx, which can't be accessed "
	"according to the dma mask 0x%llx\n",
	physical, physical+size-1, dma_mask);
	goto done;

	case OCTEON_DMA_BAR_TYPE_BIG:
	#ifdef CONFIG_64BIT
	/* If the device supports 64bit addressing, then use BAR2 */
	if (dma_mask > BAR2_PCI_ADDRESS) {
	result = physical + BAR2_PCI_ADDRESS;
	goto done;
	}
	#endif
	if (unlikely(physical < (4ul << 10))) {
	panic("dma_map_single: Not allowed to map first 4KB. "
	"It interferes with BAR0 special area\n");
	} else if (physical < (256ul << 20)) {
	if (unlikely(physical + size > (256ul << 20)))
	panic("dma_map_single: Requested memory spans "
	"Bar0 0:256MB and bootbus\n");
	result = physical;
	goto done;
	} else if (unlikely(physical < (512ul << 20))) {
	panic("dma_map_single: Not allowed to map bootbus\n");
	} else if (physical < (2ul << 30)) {
	if (unlikely(physical + size > (2ul << 30)))
	panic("dma_map_single: Requested memory spans "
	"Bar0 512MB:2GB and BAR1\n");
	result = physical;
	goto done;
	} else if (physical < (2ul << 30) + (128 << 20)) {
	/* Fall through */
	} else if (physical <
	(4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20)) {
	if (unlikely
	(physical + size >
	(4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20)))
	panic("dma_map_single: Requested memory "
	"extends past Bar1 (4GB-%luMB)\n",
	OCTEON_PCI_BAR1_HOLE_SIZE);
	result = physical;
	goto done;
	} else if ((physical >= 0x410000000ull) &&
	(physical < 0x420000000ull)) {
	if (unlikely(physical + size > 0x420000000ull))
	panic("dma_map_single: Requested memory spans "
	"non existant memory\n");
	/* BAR0 fixed mapping 256MB:512MB ->
	* 16GB+256MB:16GB+512MB */
	result = physical - 0x400000000ull;
	goto done;
	} else {
	/* Continued below switch statement */
	}
	break;

	case OCTEON_DMA_BAR_TYPE_SMALL:
	#ifdef CONFIG_64BIT
	/* If the device supports 64bit addressing, then use BAR2 */
	if (dma_mask > BAR2_PCI_ADDRESS) {
	result = physical + BAR2_PCI_ADDRESS;
	goto done;
	}
	#endif
	/* Continued below switch statement */
	break;

	default:
	panic("dma_map_single: Invalid octeon_dma_bar_type\n");
	}

	/* Don't allow mapping to span multiple Bar entries. The hardware guys
	won't guarantee that DMA across boards work */
	if (unlikely((physical >> 22) != ((physical + size - 1) >> 22)))
	panic("dma_map_single: "
	"Requested memory spans more than one Bar1 entry\n");

	if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG)
	start_index = 31;
	else if (unlikely(dma_mask < (1ul << 27)))
	start_index = (dma_mask >> 22);
	else
	start_index = 31;

	/* Only one processor can access the Bar register at once */
	spin_lock_irqsave(&bar1_lock, flags);

	/* Look through Bar1 for existing mapping that will work */
	for (index = start_index; index >= 0; index--) {
	if ((bar1_state[index].address_bits == physical >> 22) &&
	(bar1_state[index].ref_count)) {
	/* An existing mapping will work, use it */
	bar1_state[index].ref_count++;
	if (unlikely(bar1_state[index].ref_count < 0))
	panic("dma_map_single: "
	"Bar1[%d] reference count overflowed\n",
	(int) index);
	result = (index << 22) \| (physical & ((1 << 22) - 1));
	/* Large BAR1 is offset at 2GB */
	if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG)
	result += 2ul << 30;
	goto done_unlock;
	}
	}

	/* No existing mappings, look for a free entry */
	for (index = start_index; index >= 0; index--) {
	if (unlikely(bar1_state[index].ref_count == 0)) {
	union cvmx_pci_bar1_indexx bar1_index;
	/* We have a free entry, use it */
	bar1_state[index].ref_count = 1;
	bar1_state[index].address_bits = physical >> 22;
	bar1_index.u32 = 0;
	/* Address bits[35:22] sent to L2C */
	bar1_index.s.addr_idx = physical >> 22;
	/* Don't put PCI accesses in L2. */
	bar1_index.s.ca = 1;
	/* Endian Swap Mode */
	bar1_index.s.end_swp = 1;
	/* Set '1' when the selected address range is valid. */
	bar1_index.s.addr_v = 1;
	octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index),
	bar1_index.u32);
	/* An existing mapping will work, use it */
	result = (index << 22) \| (physical & ((1 << 22) - 1));
	/* Large BAR1 is offset at 2GB */
	if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG)
	result += 2ul << 30;
	goto done_unlock;
	}
	}

	pr_err("dma_map_single: "
	"Can't find empty BAR1 index for physical mapping 0x%llx\n",
	(unsigned long long) physical);

	done_unlock:
	spin_unlock_irqrestore(&bar1_lock, flags);
	done:
	pr_debug("dma_map_single 0x%llx->0x%llx\n", physical, result);
	return result;
	#endif
	}

	void octeon_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr)
	{
	#ifndef CONFIG_PCI
	/*
	* Without PCI/PCIe this function can be called for Octeon internal
	* devices such as USB. These devices all support 64bit addressing.
	*/
	return;
	#else
	unsigned long flags;
	uint64_t index;

	/*
	* Platform devices, such as the internal USB, skip all
	* translation and use Octeon physical addresses directly.
	*/
	if (dev->bus == &platform_bus_type)
	return;

	switch (octeon_dma_bar_type) {
	case OCTEON_DMA_BAR_TYPE_PCIE:
	/* Nothing to do, all mappings are static */
	goto done;

	case OCTEON_DMA_BAR_TYPE_BIG:
	#ifdef CONFIG_64BIT
	/* Nothing to do for addresses using BAR2 */
	if (dma_addr >= BAR2_PCI_ADDRESS)
	goto done;
	#endif
	if (unlikely(dma_addr < (4ul << 10)))
	panic("dma_unmap_single: Unexpect DMA address 0x%llx\n",
	dma_addr);
	else if (dma_addr < (2ul << 30))
	/* Nothing to do for addresses using BAR0 */
	goto done;
	else if (dma_addr < (2ul << 30) + (128ul << 20))
	/* Need to unmap, fall through */
	index = (dma_addr - (2ul << 30)) >> 22;
	else if (dma_addr <
	(4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20))
	goto done; /* Nothing to do for the rest of BAR1 */
	else
	panic("dma_unmap_single: Unexpect DMA address 0x%llx\n",
	dma_addr);
	/* Continued below switch statement */
	break;

	case OCTEON_DMA_BAR_TYPE_SMALL:
	#ifdef CONFIG_64BIT
	/* Nothing to do for addresses using BAR2 */
	if (dma_addr >= BAR2_PCI_ADDRESS)
	goto done;
	#endif
	index = dma_addr >> 22;
	/* Continued below switch statement */
	break;

	default:
	panic("dma_unmap_single: Invalid octeon_dma_bar_type\n");
	}

	if (unlikely(index > 31))
	panic("dma_unmap_single: "
	"Attempt to unmap an invalid address (0x%llx)\n",
	dma_addr);

	spin_lock_irqsave(&bar1_lock, flags);
	bar1_state[index].ref_count--;
	if (bar1_state[index].ref_count == 0)
	octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index), 0);
	else if (unlikely(bar1_state[index].ref_count < 0))
	panic("dma_unmap_single: Bar1[%u] reference count < 0\n",
	(int) index);
	spin_unlock_irqrestore(&bar1_lock, flags);
	done:
	pr_debug("dma_unmap_single 0x%llx\n", dma_addr);
	return;
	#endif
	}