2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2000,2002-2005 Silicon Graphics, Inc. All rights reserved.
8 * Routines for PCI DMA mapping. See Documentation/DMA-API.txt for
9 * a description of how these routines should be used.
12 #include <linux/module.h>
13 #include <linux/dma-attrs.h>
15 #include <asm/sn/intr.h>
16 #include <asm/sn/pcibus_provider_defs.h>
17 #include <asm/sn/pcidev.h>
18 #include <asm/sn/sn_sal.h>
20 #define SG_ENT_VIRT_ADDRESS(sg) (sg_virt((sg)))
21 #define SG_ENT_PHYS_ADDRESS(SG) virt_to_phys(SG_ENT_VIRT_ADDRESS(SG))
24 * sn_dma_supported - test a DMA mask
25 * @dev: device to test
26 * @mask: DMA mask to test
28 * Return whether the given PCI device DMA address mask can be supported
29 * properly. For example, if your device can only drive the low 24-bits
30 * during PCI bus mastering, then you would pass 0x00ffffff as the mask to
31 * this function. Of course, SN only supports devices that have 32 or more
32 * address bits when using the PMU.
34 int sn_dma_supported(struct device *dev, u64 mask)
36 BUG_ON(dev->bus != &pci_bus_type);
38 if (mask < 0x7fffffff)
42 EXPORT_SYMBOL(sn_dma_supported);
45 * sn_dma_set_mask - set the DMA mask
49 * Set @dev's DMA mask if the hw supports it.
51 int sn_dma_set_mask(struct device *dev, u64 dma_mask)
53 BUG_ON(dev->bus != &pci_bus_type);
55 if (!sn_dma_supported(dev, dma_mask))
58 *dev->dma_mask = dma_mask;
61 EXPORT_SYMBOL(sn_dma_set_mask);
64 * sn_dma_alloc_coherent - allocate memory for coherent DMA
65 * @dev: device to allocate for
66 * @size: size of the region
67 * @dma_handle: DMA (bus) address
68 * @flags: memory allocation flags
70 * dma_alloc_coherent() returns a pointer to a memory region suitable for
71 * coherent DMA traffic to/from a PCI device. On SN platforms, this means
72 * that @dma_handle will have the %PCIIO_DMA_CMD flag set.
74 * This interface is usually used for "command" streams (e.g. the command
75 * queue for a SCSI controller). See Documentation/DMA-API.txt for
78 void *sn_dma_alloc_coherent(struct device *dev, size_t size,
79 dma_addr_t * dma_handle, gfp_t flags)
82 unsigned long phys_addr;
84 struct pci_dev *pdev = to_pci_dev(dev);
85 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
87 BUG_ON(dev->bus != &pci_bus_type);
90 * Allocate the memory.
92 node = pcibus_to_node(pdev->bus);
93 if (likely(node >=0)) {
94 struct page *p = alloc_pages_node(node, flags, get_order(size));
97 cpuaddr = page_address(p);
101 cpuaddr = (void *)__get_free_pages(flags, get_order(size));
103 if (unlikely(!cpuaddr))
106 memset(cpuaddr, 0x0, size);
108 /* physical addr. of the memory we just got */
109 phys_addr = __pa(cpuaddr);
112 * 64 bit address translations should never fail.
113 * 32 bit translations can fail if there are insufficient mapping
117 *dma_handle = provider->dma_map_consistent(pdev, phys_addr, size,
120 printk(KERN_ERR "%s: out of ATEs\n", __func__);
121 free_pages((unsigned long)cpuaddr, get_order(size));
127 EXPORT_SYMBOL(sn_dma_alloc_coherent);
130 * sn_pci_free_coherent - free memory associated with coherent DMAable region
131 * @dev: device to free for
132 * @size: size to free
133 * @cpu_addr: kernel virtual address to free
134 * @dma_handle: DMA address associated with this region
136 * Frees the memory allocated by dma_alloc_coherent(), potentially unmapping
137 * any associated IOMMU mappings.
139 void sn_dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
140 dma_addr_t dma_handle)
142 struct pci_dev *pdev = to_pci_dev(dev);
143 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
145 BUG_ON(dev->bus != &pci_bus_type);
147 provider->dma_unmap(pdev, dma_handle, 0);
148 free_pages((unsigned long)cpu_addr, get_order(size));
150 EXPORT_SYMBOL(sn_dma_free_coherent);
153 * sn_dma_map_single_attrs - map a single page for DMA
154 * @dev: device to map for
155 * @cpu_addr: kernel virtual address of the region to map
156 * @size: size of the region
157 * @direction: DMA direction
158 * @attrs: optional dma attributes
160 * Map the region pointed to by @cpu_addr for DMA and return the
163 * We map this to the one step pcibr_dmamap_trans interface rather than
164 * the two step pcibr_dmamap_alloc/pcibr_dmamap_addr because we have
165 * no way of saving the dmamap handle from the alloc to later free
166 * (which is pretty much unacceptable).
168 * mappings with the DMA_ATTR_WRITE_BARRIER get mapped with
169 * dma_map_consistent() so that writes force a flush of pending DMA.
170 * (See "SGI Altix Architecture Considerations for Linux Device Drivers",
171 * Document Number: 007-4763-001)
173 * TODO: simplify our interface;
174 * figure out how to save dmamap handle so can use two step.
176 dma_addr_t sn_dma_map_single_attrs(struct device *dev, void *cpu_addr,
177 size_t size, int direction,
178 struct dma_attrs *attrs)
181 unsigned long phys_addr;
182 struct pci_dev *pdev = to_pci_dev(dev);
183 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
186 dmabarr = dma_get_attr(DMA_ATTR_WRITE_BARRIER, attrs);
188 BUG_ON(dev->bus != &pci_bus_type);
190 phys_addr = __pa(cpu_addr);
192 dma_addr = provider->dma_map_consistent(pdev, phys_addr,
193 size, SN_DMA_ADDR_PHYS);
195 dma_addr = provider->dma_map(pdev, phys_addr, size,
199 printk(KERN_ERR "%s: out of ATEs\n", __func__);
204 EXPORT_SYMBOL(sn_dma_map_single_attrs);
207 * sn_dma_unmap_single_attrs - unamp a DMA mapped page
208 * @dev: device to sync
209 * @dma_addr: DMA address to sync
210 * @size: size of region
211 * @direction: DMA direction
212 * @attrs: optional dma attributes
214 * This routine is supposed to sync the DMA region specified
215 * by @dma_handle into the coherence domain. On SN, we're always cache
216 * coherent, so we just need to free any ATEs associated with this mapping.
218 void sn_dma_unmap_single_attrs(struct device *dev, dma_addr_t dma_addr,
219 size_t size, int direction,
220 struct dma_attrs *attrs)
222 struct pci_dev *pdev = to_pci_dev(dev);
223 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
225 BUG_ON(dev->bus != &pci_bus_type);
227 provider->dma_unmap(pdev, dma_addr, direction);
229 EXPORT_SYMBOL(sn_dma_unmap_single_attrs);
232 * sn_dma_unmap_sg_attrs - unmap a DMA scatterlist
233 * @dev: device to unmap
234 * @sg: scatterlist to unmap
235 * @nhwentries: number of scatterlist entries
236 * @direction: DMA direction
237 * @attrs: optional dma attributes
239 * Unmap a set of streaming mode DMA translations.
241 void sn_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sgl,
242 int nhwentries, int direction,
243 struct dma_attrs *attrs)
246 struct pci_dev *pdev = to_pci_dev(dev);
247 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
248 struct scatterlist *sg;
250 BUG_ON(dev->bus != &pci_bus_type);
252 for_each_sg(sgl, sg, nhwentries, i) {
253 provider->dma_unmap(pdev, sg->dma_address, direction);
254 sg->dma_address = (dma_addr_t) NULL;
258 EXPORT_SYMBOL(sn_dma_unmap_sg_attrs);
261 * sn_dma_map_sg_attrs - map a scatterlist for DMA
262 * @dev: device to map for
263 * @sg: scatterlist to map
264 * @nhwentries: number of entries
265 * @direction: direction of the DMA transaction
266 * @attrs: optional dma attributes
268 * mappings with the DMA_ATTR_WRITE_BARRIER get mapped with
269 * dma_map_consistent() so that writes force a flush of pending DMA.
270 * (See "SGI Altix Architecture Considerations for Linux Device Drivers",
271 * Document Number: 007-4763-001)
273 * Maps each entry of @sg for DMA.
275 int sn_dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
276 int nhwentries, int direction, struct dma_attrs *attrs)
278 unsigned long phys_addr;
279 struct scatterlist *saved_sg = sgl, *sg;
280 struct pci_dev *pdev = to_pci_dev(dev);
281 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
285 dmabarr = dma_get_attr(DMA_ATTR_WRITE_BARRIER, attrs);
287 BUG_ON(dev->bus != &pci_bus_type);
290 * Setup a DMA address for each entry in the scatterlist.
292 for_each_sg(sgl, sg, nhwentries, i) {
294 phys_addr = SG_ENT_PHYS_ADDRESS(sg);
296 dma_addr = provider->dma_map_consistent(pdev,
301 dma_addr = provider->dma_map(pdev, phys_addr,
305 sg->dma_address = dma_addr;
306 if (!sg->dma_address) {
307 printk(KERN_ERR "%s: out of ATEs\n", __func__);
310 * Free any successfully allocated entries.
313 sn_dma_unmap_sg_attrs(dev, saved_sg, i,
318 sg->dma_length = sg->length;
323 EXPORT_SYMBOL(sn_dma_map_sg_attrs);
325 void sn_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
326 size_t size, int direction)
328 BUG_ON(dev->bus != &pci_bus_type);
330 EXPORT_SYMBOL(sn_dma_sync_single_for_cpu);
332 void sn_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
333 size_t size, int direction)
335 BUG_ON(dev->bus != &pci_bus_type);
337 EXPORT_SYMBOL(sn_dma_sync_single_for_device);
339 void sn_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
340 int nelems, int direction)
342 BUG_ON(dev->bus != &pci_bus_type);
344 EXPORT_SYMBOL(sn_dma_sync_sg_for_cpu);
346 void sn_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
347 int nelems, int direction)
349 BUG_ON(dev->bus != &pci_bus_type);
351 EXPORT_SYMBOL(sn_dma_sync_sg_for_device);
353 int sn_dma_mapping_error(dma_addr_t dma_addr)
357 EXPORT_SYMBOL(sn_dma_mapping_error);
359 char *sn_pci_get_legacy_mem(struct pci_bus *bus)
361 if (!SN_PCIBUS_BUSSOFT(bus))
362 return ERR_PTR(-ENODEV);
364 return (char *)(SN_PCIBUS_BUSSOFT(bus)->bs_legacy_mem | __IA64_UNCACHED_OFFSET);
367 int sn_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
371 struct ia64_sal_retval isrv;
374 * First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work
375 * around hw issues at the pci bus level. SGI proms older than
376 * 4.10 don't implement this.
379 SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE,
380 pci_domain_nr(bus), bus->number,
383 port, size, __pa(val));
385 if (isrv.status == 0)
389 * If the above failed, retry using the SAL_PROBE call which should
390 * be present in all proms (but which cannot work round PCI chipset
391 * bugs). This code is retained for compatibility with old
392 * pre-4.10 proms, and should be removed at some point in the future.
395 if (!SN_PCIBUS_BUSSOFT(bus))
398 addr = SN_PCIBUS_BUSSOFT(bus)->bs_legacy_io | __IA64_UNCACHED_OFFSET;
401 ret = ia64_sn_probe_mem(addr, (long)size, (void *)val);
412 int sn_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
417 struct ia64_sal_retval isrv;
420 * First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work
421 * around hw issues at the pci bus level. SGI proms older than
422 * 4.10 don't implement this.
425 SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE,
426 pci_domain_nr(bus), bus->number,
429 port, size, __pa(&val));
431 if (isrv.status == 0)
435 * If the above failed, retry using the SAL_PROBE call which should
436 * be present in all proms (but which cannot work round PCI chipset
437 * bugs). This code is retained for compatibility with old
438 * pre-4.10 proms, and should be removed at some point in the future.
441 if (!SN_PCIBUS_BUSSOFT(bus)) {
446 /* Put the phys addr in uncached space */
447 paddr = SN_PCIBUS_BUSSOFT(bus)->bs_legacy_io | __IA64_UNCACHED_OFFSET;
449 addr = (unsigned long *)paddr;
453 *(volatile u8 *)(addr) = (u8)(val);
456 *(volatile u16 *)(addr) = (u16)(val);
459 *(volatile u32 *)(addr) = (u32)(val);