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 (file)
--- a/arch/mips/include/asm/pci.h
+++ b/arch/mips/include/asm/pci.h
@@ -43,8 +43,6 @@ struct pci_controller {
           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 @@ static inline void pci_resource_to_user(const struct pci_dev *dev, int bar,
 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..693e8d1 100644 (file)
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -52,13 +52,6 @@ struct screen_info screen_info;
 #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 (file)
--- a/arch/mips/pci/pci-ip32.c
+++ b/arch/mips/pci/pci-ip32.c
@@ -116,7 +116,6 @@ static struct pci_controller mace_pci_controller = {
        .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 (file)
--- a/arch/mips/pci/pci.c
+++ b/arch/mips/pci/pci.c
@@ -83,9 +83,6 @@ static void pcibios_scanbus(struct pci_controller *hose)
        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 (file)
--- a/arch/mips/pnx833x/common/setup.c
+++ b/arch/mips/pnx833x/common/setup.c
@@ -38,9 +38,6 @@ extern void pnx833x_machine_power_off(void);
 
 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);