From e8b5325ca3d01c512be6f04d587869a01e0ea59f Mon Sep 17 00:00:00 2001 From: Sergey Ryazanov Date: Sat, 30 Aug 2014 06:06:28 +0400 Subject: [PATCH] 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 Cc: Linux MIPS Patchwork: https://patchwork.linux-mips.org/patch/7604/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/pci.h | 10 ++++------ arch/mips/kernel/setup.c | 7 ------- arch/mips/pci/pci-ip32.c | 1 - arch/mips/pci/pci.c | 3 --- arch/mips/pnx833x/common/setup.c | 3 --- 5 files changed, 4 insertions(+), 20 deletions(-) diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h index 8c16fb7b8fdb..86b239d9d75d 100644 --- 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 9b20a0f89812..693e8d1a174c 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -51,13 +51,6 @@ EXPORT_SYMBOL(cpu_data); 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 * diff --git a/arch/mips/pci/pci-ip32.c b/arch/mips/pci/pci-ip32.c index b1e061f7fdc7..7ae89d0c7099 100644 --- 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 b8a0bf5766f2..f1b11f0dea2d 100644 --- 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 99b4d94236cc..8a7443b2535e 100644 --- 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); -- 2.20.1