MIPS: make PCI_DMA_BUS_IS_PHYS=1 constant
No one of supported MIPS machines has an IOMMU unit, so we can safely define
PCI_DMA_BUS_IS_PHYS = 1. Also remove iommu flag from the pci controller
structure, since it is useless.
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/7604/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h
index 8c16fb7..86b239d 100644
--- a/arch/mips/include/asm/pci.h
+++ b/arch/mips/include/asm/pci.h
@@ -43,8 +43,6 @@
and XFree86. Eventually will be removed. */
unsigned int need_domain_info;
- int iommu;
-
/* Optional access methods for reading/writing the bus number
of the PCI controller */
int (*get_busno)(void);
@@ -106,11 +104,11 @@
struct pci_dev;
/*
- * The PCI address space does equal the physical memory address space. The
- * networking and block device layers use this boolean for bounce buffer
- * decisions. This is set if any hose does not have an IOMMU.
+ * The PCI address space does equal the physical memory address space.
+ * The networking and block device layers use this boolean for bounce
+ * buffer decisions.
*/
-extern unsigned int PCI_DMA_BUS_IS_PHYS;
+#define PCI_DMA_BUS_IS_PHYS (1)
#ifdef CONFIG_PCI_DOMAINS
#define pci_domain_nr(bus) ((struct pci_controller *)(bus)->sysdata)->index
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 9b20a0f..693e8d1a 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -52,13 +52,6 @@
#endif
/*
- * Despite it's name this variable is even if we don't have PCI
- */
-unsigned int PCI_DMA_BUS_IS_PHYS;
-
-EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
-
-/*
* Setup information
*
* These are initialized so they are in the .data section
diff --git a/arch/mips/pci/pci-ip32.c b/arch/mips/pci/pci-ip32.c
index b1e061f..7ae89d0 100644
--- a/arch/mips/pci/pci-ip32.c
+++ b/arch/mips/pci/pci-ip32.c
@@ -116,7 +116,6 @@
.pci_ops = &mace_pci_ops,
.mem_resource = &mace_pci_mem_resource,
.io_resource = &mace_pci_io_resource,
- .iommu = 0,
.mem_offset = MACE_PCI_MEM_OFFSET,
.io_offset = 0,
.io_map_base = CKSEG1ADDR(MACEPCI_LOW_IO),
diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
index b8a0bf5..f1b11f0 100644
--- a/arch/mips/pci/pci.c
+++ b/arch/mips/pci/pci.c
@@ -83,9 +83,6 @@
LIST_HEAD(resources);
struct pci_bus *bus;
- if (!hose->iommu)
- PCI_DMA_BUS_IS_PHYS = 1;
-
if (hose->get_busno && pci_has_flag(PCI_PROBE_ONLY))
next_busno = (*hose->get_busno)();
diff --git a/arch/mips/pnx833x/common/setup.c b/arch/mips/pnx833x/common/setup.c
index 99b4d94..8a7443b 100644
--- a/arch/mips/pnx833x/common/setup.c
+++ b/arch/mips/pnx833x/common/setup.c
@@ -38,9 +38,6 @@
int __init plat_mem_setup(void)
{
- /* fake pci bus to avoid bounce buffers */
- PCI_DMA_BUS_IS_PHYS = 1;
-
/* set mips clock to 320MHz */
#if defined(CONFIG_SOC_PNX8335)
PNX8335_WRITEFIELD(0x17, CLOCK_PLL_CPU_CTL, FREQ);
