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MIPS: ath25: use generic dma noncoherent ops

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Provide phys_to_dma/dma_to_phys helpers only if PCI support is
enabled, everything else is generic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19547/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
This commit is contained in:
Christoph Hellwig 2018-06-15 13:08:49 +02:00 committed by Paul Burton
parent 03df8229a8
commit d1f2564a56
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
4 changed files with 25 additions and 72 deletions
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1
arch/mips/Kconfig
View File

@ -182,7 +182,6 @@ config ATH25
select DMA_NONCOHERENT
select IRQ_MIPS_CPU
select IRQ_DOMAIN
select MIPS_DMA_DEFAULT
select SYS_HAS_CPU_MIPS32_R1
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_32BIT_KERNEL

1
arch/mips/ath25/Kconfig
View File

@ -12,6 +12,7 @@ config SOC_AR2315
config PCI_AR2315
bool "Atheros AR2315 PCI controller support"
depends on SOC_AR2315
select ARCH_HAS_PHYS_TO_DMA
select HW_HAS_PCI
select PCI
default y

71
arch/mips/include/asm/mach-ath25/dma-coherence.h
View File

@ -1,71 +0,0 @@
/*
* 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) 2006 Ralf Baechle <ralf@linux-mips.org>
* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
*
*/
#ifndef __ASM_MACH_ATH25_DMA_COHERENCE_H
#define __ASM_MACH_ATH25_DMA_COHERENCE_H
#include <linux/device.h>
/*
* We need some arbitrary non-zero value to be programmed to the BAR1 register
* of PCI host controller to enable DMA. The same value should be used as the
* offset to calculate the physical address of DMA buffer for PCI devices.
*/
#define AR2315_PCI_HOST_SDRAM_BASEADDR 0x20000000
static inline dma_addr_t ath25_dev_offset(struct device *dev)
{
#ifdef CONFIG_PCI
extern struct bus_type pci_bus_type;
if (dev && dev->bus == &pci_bus_type)
return AR2315_PCI_HOST_SDRAM_BASEADDR;
#endif
return 0;
}
static inline dma_addr_t
plat_map_dma_mem(struct device *dev, void *addr, size_t size)
{
return virt_to_phys(addr) + ath25_dev_offset(dev);
}
static inline dma_addr_t
plat_map_dma_mem_page(struct device *dev, struct page *page)
{
return page_to_phys(page) + ath25_dev_offset(dev);
}
static inline unsigned long
plat_dma_addr_to_phys(struct device *dev, dma_addr_t dma_addr)
{
return dma_addr - ath25_dev_offset(dev);
}
static inline void
plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
{
}
static inline int plat_dma_supported(struct device *dev, u64 mask)
{
return 1;
}
static inline int plat_device_is_coherent(struct device *dev)
{
return 0;
}
static inline void plat_post_dma_flush(struct device *dev)
{
}
#endif /* __ASM_MACH_ATH25_DMA_COHERENCE_H */

24
arch/mips/pci/pci-ar2315.c
View File

@ -149,6 +149,13 @@
#define AR2315_PCI_HOST_SLOT 3
#define AR2315_PCI_HOST_DEVID ((0xff18 << 16) | PCI_VENDOR_ID_ATHEROS)
/*
* We need some arbitrary non-zero value to be programmed to the BAR1 register
* of PCI host controller to enable DMA. The same value should be used as the
* offset to calculate the physical address of DMA buffer for PCI devices.
*/
#define AR2315_PCI_HOST_SDRAM_BASEADDR 0x20000000
/* ??? access BAR */
#define AR2315_PCI_HOST_MBAR0 0x10000000
/* RAM access BAR */
@ -167,6 +174,23 @@ struct ar2315_pci_ctrl {
struct resource io_res;
};
static inline dma_addr_t ar2315_dev_offset(struct device *dev)
{
if (dev && dev_is_pci(dev))
return AR2315_PCI_HOST_SDRAM_BASEADDR;
return 0;
}
dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
{
return paddr + ar2315_dev_offset(dev);
}
phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dma_addr)
{
return dma_addr - ar2315_dev_offset(dev);
}
static inline struct ar2315_pci_ctrl *ar2315_pci_bus_to_apc(struct pci_bus *bus)
{
struct pci_controller *hose = bus->sysdata;