diff options
Diffstat (limited to 'arch/ia64/sn/pci/pci_dma.c')
| -rw-r--r-- | arch/ia64/sn/pci/pci_dma.c | 446 |
1 files changed, 0 insertions, 446 deletions
diff --git a/arch/ia64/sn/pci/pci_dma.c b/arch/ia64/sn/pci/pci_dma.c deleted file mode 100644 index b7d42e4edc1f..000000000000 --- a/arch/ia64/sn/pci/pci_dma.c +++ /dev/null @@ -1,446 +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) 2000,2002-2005 Silicon Graphics, Inc. All rights reserved. - * - * Routines for PCI DMA mapping. See Documentation/DMA-API.txt for - * a description of how these routines should be used. - */ - -#include <linux/gfp.h> -#include <linux/module.h> -#include <linux/dma-mapping.h> -#include <asm/dma.h> -#include <asm/sn/intr.h> -#include <asm/sn/pcibus_provider_defs.h> -#include <asm/sn/pcidev.h> -#include <asm/sn/sn_sal.h> - -#define SG_ENT_VIRT_ADDRESS(sg) (sg_virt((sg))) -#define SG_ENT_PHYS_ADDRESS(SG) virt_to_phys(SG_ENT_VIRT_ADDRESS(SG)) - -/** - * sn_dma_supported - test a DMA mask - * @dev: device to test - * @mask: DMA mask to test - * - * Return whether the given PCI device DMA address mask can be supported - * properly. For example, if your device can only drive the low 24-bits - * during PCI bus mastering, then you would pass 0x00ffffff as the mask to - * this function. Of course, SN only supports devices that have 32 or more - * address bits when using the PMU. - */ -static int sn_dma_supported(struct device *dev, u64 mask) -{ - BUG_ON(!dev_is_pci(dev)); - - if (mask < 0x7fffffff) - return 0; - return 1; -} - -/** - * sn_dma_set_mask - set the DMA mask - * @dev: device to set - * @dma_mask: new mask - * - * Set @dev's DMA mask if the hw supports it. - */ -int sn_dma_set_mask(struct device *dev, u64 dma_mask) -{ - BUG_ON(!dev_is_pci(dev)); - - if (!sn_dma_supported(dev, dma_mask)) - return 0; - - *dev->dma_mask = dma_mask; - return 1; -} -EXPORT_SYMBOL(sn_dma_set_mask); - -/** - * sn_dma_alloc_coherent - allocate memory for coherent DMA - * @dev: device to allocate for - * @size: size of the region - * @dma_handle: DMA (bus) address - * @flags: memory allocation flags - * - * dma_alloc_coherent() returns a pointer to a memory region suitable for - * coherent DMA traffic to/from a PCI device. On SN platforms, this means - * that @dma_handle will have the %PCIIO_DMA_CMD flag set. - * - * This interface is usually used for "command" streams (e.g. the command - * queue for a SCSI controller). See Documentation/DMA-API.txt for - * more information. - */ -static void *sn_dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t * dma_handle, gfp_t flags, - unsigned long attrs) -{ - void *cpuaddr; - unsigned long phys_addr; - int node; - struct pci_dev *pdev = to_pci_dev(dev); - struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev); - - BUG_ON(!dev_is_pci(dev)); - - /* - * Allocate the memory. - */ - node = pcibus_to_node(pdev->bus); - if (likely(node >=0)) { - struct page *p = __alloc_pages_node(node, - flags, get_order(size)); - - if (likely(p)) - cpuaddr = page_address(p); - else - return NULL; - } else - cpuaddr = (void *)__get_free_pages(flags, get_order(size)); - - if (unlikely(!cpuaddr)) - return NULL; - - memset(cpuaddr, 0x0, size); - - /* physical addr. of the memory we just got */ - phys_addr = __pa(cpuaddr); - - /* - * 64 bit address translations should never fail. - * 32 bit translations can fail if there are insufficient mapping - * resources. - */ - - *dma_handle = provider->dma_map_consistent(pdev, phys_addr, size, - SN_DMA_ADDR_PHYS); - if (!*dma_handle) { - printk(KERN_ERR "%s: out of ATEs\n", __func__); - free_pages((unsigned long)cpuaddr, get_order(size)); - return NULL; - } - - return cpuaddr; -} - -/** - * sn_pci_free_coherent - free memory associated with coherent DMAable region - * @dev: device to free for - * @size: size to free - * @cpu_addr: kernel virtual address to free - * @dma_handle: DMA address associated with this region - * - * Frees the memory allocated by dma_alloc_coherent(), potentially unmapping - * any associated IOMMU mappings. - */ -static void sn_dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, - dma_addr_t dma_handle, unsigned long attrs) -{ - struct pci_dev *pdev = to_pci_dev(dev); - struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev); - - BUG_ON(!dev_is_pci(dev)); - - provider->dma_unmap(pdev, dma_handle, 0); - free_pages((unsigned long)cpu_addr, get_order(size)); -} - -/** - * sn_dma_map_single_attrs - map a single page for DMA - * @dev: device to map for - * @cpu_addr: kernel virtual address of the region to map - * @size: size of the region - * @direction: DMA direction - * @attrs: optional dma attributes - * - * Map the region pointed to by @cpu_addr for DMA and return the - * DMA address. - * - * We map this to the one step pcibr_dmamap_trans interface rather than - * the two step pcibr_dmamap_alloc/pcibr_dmamap_addr because we have - * no way of saving the dmamap handle from the alloc to later free - * (which is pretty much unacceptable). - * - * mappings with the DMA_ATTR_WRITE_BARRIER get mapped with - * dma_map_consistent() so that writes force a flush of pending DMA. - * (See "SGI Altix Architecture Considerations for Linux Device Drivers", - * Document Number: 007-4763-001) - * - * TODO: simplify our interface; - * figure out how to save dmamap handle so can use two step. - */ -static dma_addr_t sn_dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - unsigned long attrs) -{ - void *cpu_addr = page_address(page) + offset; - dma_addr_t dma_addr; - unsigned long phys_addr; - struct pci_dev *pdev = to_pci_dev(dev); - struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev); - - BUG_ON(!dev_is_pci(dev)); - - phys_addr = __pa(cpu_addr); - if (attrs & DMA_ATTR_WRITE_BARRIER) - dma_addr = provider->dma_map_consistent(pdev, phys_addr, - size, SN_DMA_ADDR_PHYS); - else - dma_addr = provider->dma_map(pdev, phys_addr, size, - SN_DMA_ADDR_PHYS); - - if (!dma_addr) { - printk(KERN_ERR "%s: out of ATEs\n", __func__); - return DMA_MAPPING_ERROR; - } - return dma_addr; -} - -/** - * sn_dma_unmap_single_attrs - unamp a DMA mapped page - * @dev: device to sync - * @dma_addr: DMA address to sync - * @size: size of region - * @direction: DMA direction - * @attrs: optional dma attributes - * - * This routine is supposed to sync the DMA region specified - * by @dma_handle into the coherence domain. On SN, we're always cache - * coherent, so we just need to free any ATEs associated with this mapping. - */ -static void sn_dma_unmap_page(struct device *dev, dma_addr_t dma_addr, - size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - struct pci_dev *pdev = to_pci_dev(dev); - struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev); - - BUG_ON(!dev_is_pci(dev)); - - provider->dma_unmap(pdev, dma_addr, dir); -} - -/** - * sn_dma_unmap_sg - unmap a DMA scatterlist - * @dev: device to unmap - * @sg: scatterlist to unmap - * @nhwentries: number of scatterlist entries - * @direction: DMA direction - * @attrs: optional dma attributes - * - * Unmap a set of streaming mode DMA translations. - */ -static void sn_dma_unmap_sg(struct device *dev, struct scatterlist *sgl, - int nhwentries, enum dma_data_direction dir, - unsigned long attrs) -{ - int i; - struct pci_dev *pdev = to_pci_dev(dev); - struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev); - struct scatterlist *sg; - - BUG_ON(!dev_is_pci(dev)); - - for_each_sg(sgl, sg, nhwentries, i) { - provider->dma_unmap(pdev, sg->dma_address, dir); - sg->dma_address = (dma_addr_t) NULL; - sg->dma_length = 0; - } -} - -/** - * sn_dma_map_sg - map a scatterlist for DMA - * @dev: device to map for - * @sg: scatterlist to map - * @nhwentries: number of entries - * @direction: direction of the DMA transaction - * @attrs: optional dma attributes - * - * mappings with the DMA_ATTR_WRITE_BARRIER get mapped with - * dma_map_consistent() so that writes force a flush of pending DMA. - * (See "SGI Altix Architecture Considerations for Linux Device Drivers", - * Document Number: 007-4763-001) - * - * Maps each entry of @sg for DMA. - */ -static int sn_dma_map_sg(struct device *dev, struct scatterlist *sgl, - int nhwentries, enum dma_data_direction dir, - unsigned long attrs) -{ - unsigned long phys_addr; - struct scatterlist *saved_sg = sgl, *sg; - struct pci_dev *pdev = to_pci_dev(dev); - struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev); - int i; - - BUG_ON(!dev_is_pci(dev)); - - /* - * Setup a DMA address for each entry in the scatterlist. - */ - for_each_sg(sgl, sg, nhwentries, i) { - dma_addr_t dma_addr; - phys_addr = SG_ENT_PHYS_ADDRESS(sg); - if (attrs & DMA_ATTR_WRITE_BARRIER) - dma_addr = provider->dma_map_consistent(pdev, - phys_addr, - sg->length, - SN_DMA_ADDR_PHYS); - else - dma_addr = provider->dma_map(pdev, phys_addr, - sg->length, - SN_DMA_ADDR_PHYS); - - sg->dma_address = dma_addr; - if (!sg->dma_address) { - printk(KERN_ERR "%s: out of ATEs\n", __func__); - - /* - * Free any successfully allocated entries. - */ - if (i > 0) - sn_dma_unmap_sg(dev, saved_sg, i, dir, attrs); - return 0; - } - - sg->dma_length = sg->length; - } - - return nhwentries; -} - -static u64 sn_dma_get_required_mask(struct device *dev) -{ - return DMA_BIT_MASK(64); -} - -char *sn_pci_get_legacy_mem(struct pci_bus *bus) -{ - if (!SN_PCIBUS_BUSSOFT(bus)) - return ERR_PTR(-ENODEV); - - return (char *)(SN_PCIBUS_BUSSOFT(bus)->bs_legacy_mem | __IA64_UNCACHED_OFFSET); -} - -int sn_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size) -{ - unsigned long addr; - int ret; - struct ia64_sal_retval isrv; - - /* - * First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work - * around hw issues at the pci bus level. SGI proms older than - * 4.10 don't implement this. - */ - - SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE, - pci_domain_nr(bus), bus->number, - 0, /* io */ - 0, /* read */ - port, size, __pa(val)); - - if (isrv.status == 0) - return size; - - /* - * If the above failed, retry using the SAL_PROBE call which should - * be present in all proms (but which cannot work round PCI chipset - * bugs). This code is retained for compatibility with old - * pre-4.10 proms, and should be removed at some point in the future. - */ - - if (!SN_PCIBUS_BUSSOFT(bus)) - return -ENODEV; - - addr = SN_PCIBUS_BUSSOFT(bus)->bs_legacy_io | __IA64_UNCACHED_OFFSET; - addr += port; - - ret = ia64_sn_probe_mem(addr, (long)size, (void *)val); - - if (ret == 2) - return -EINVAL; - - if (ret == 1) - *val = -1; - - return size; -} - -int sn_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size) -{ - int ret = size; - unsigned long paddr; - unsigned long *addr; - struct ia64_sal_retval isrv; - - /* - * First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work - * around hw issues at the pci bus level. SGI proms older than - * 4.10 don't implement this. - */ - - SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE, - pci_domain_nr(bus), bus->number, - 0, /* io */ - 1, /* write */ - port, size, __pa(&val)); - - if (isrv.status == 0) - return size; - - /* - * If the above failed, retry using the SAL_PROBE call which should - * be present in all proms (but which cannot work round PCI chipset - * bugs). This code is retained for compatibility with old - * pre-4.10 proms, and should be removed at some point in the future. - */ - - if (!SN_PCIBUS_BUSSOFT(bus)) { - ret = -ENODEV; - goto out; - } - - /* Put the phys addr in uncached space */ - paddr = SN_PCIBUS_BUSSOFT(bus)->bs_legacy_io | __IA64_UNCACHED_OFFSET; - paddr += port; - addr = (unsigned long *)paddr; - - switch (size) { - case 1: - *(volatile u8 *)(addr) = (u8)(val); - break; - case 2: - *(volatile u16 *)(addr) = (u16)(val); - break; - case 4: - *(volatile u32 *)(addr) = (u32)(val); - break; - default: - ret = -EINVAL; - break; - } - out: - return ret; -} - -static struct dma_map_ops sn_dma_ops = { - .alloc = sn_dma_alloc_coherent, - .free = sn_dma_free_coherent, - .map_page = sn_dma_map_page, - .unmap_page = sn_dma_unmap_page, - .map_sg = sn_dma_map_sg, - .unmap_sg = sn_dma_unmap_sg, - .dma_supported = sn_dma_supported, - .get_required_mask = sn_dma_get_required_mask, -}; - -void sn_dma_init(void) -{ - dma_ops = &sn_dma_ops; -} |