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>
14 #include <asm/sn/pcibr_provider.h>
15 #include <asm/sn/pcibus_provider_defs.h>
16 #include <asm/sn/pcidev.h>
17 #include <asm/sn/sn_sal.h>
19 #define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) + (sg)->offset)
20 #define SG_ENT_PHYS_ADDRESS(SG) virt_to_phys(SG_ENT_VIRT_ADDRESS(SG))
23 * sn_dma_supported - test a DMA mask
24 * @dev: device to test
25 * @mask: DMA mask to test
27 * Return whether the given PCI device DMA address mask can be supported
28 * properly. For example, if your device can only drive the low 24-bits
29 * during PCI bus mastering, then you would pass 0x00ffffff as the mask to
30 * this function. Of course, SN only supports devices that have 32 or more
31 * address bits when using the PMU.
33 int sn_dma_supported(struct device *dev, u64 mask)
35 BUG_ON(dev->bus != &pci_bus_type);
37 if (mask < 0x7fffffff)
41 EXPORT_SYMBOL(sn_dma_supported);
44 * sn_dma_set_mask - set the DMA mask
48 * Set @dev's DMA mask if the hw supports it.
50 int sn_dma_set_mask(struct device *dev, u64 dma_mask)
52 BUG_ON(dev->bus != &pci_bus_type);
54 if (!sn_dma_supported(dev, dma_mask))
57 *dev->dma_mask = dma_mask;
60 EXPORT_SYMBOL(sn_dma_set_mask);
63 * sn_dma_alloc_coherent - allocate memory for coherent DMA
64 * @dev: device to allocate for
65 * @size: size of the region
66 * @dma_handle: DMA (bus) address
67 * @flags: memory allocation flags
69 * dma_alloc_coherent() returns a pointer to a memory region suitable for
70 * coherent DMA traffic to/from a PCI device. On SN platforms, this means
71 * that @dma_handle will have the %PCIIO_DMA_CMD flag set.
73 * This interface is usually used for "command" streams (e.g. the command
74 * queue for a SCSI controller). See Documentation/DMA-API.txt for
77 void *sn_dma_alloc_coherent(struct device *dev, size_t size,
78 dma_addr_t * dma_handle, gfp_t flags)
81 unsigned long phys_addr;
83 struct pci_dev *pdev = to_pci_dev(dev);
84 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
86 BUG_ON(dev->bus != &pci_bus_type);
89 * Allocate the memory.
91 node = pcibus_to_node(pdev->bus);
92 if (likely(node >=0)) {
93 struct page *p = alloc_pages_node(node, flags, get_order(size));
96 cpuaddr = page_address(p);
100 cpuaddr = (void *)__get_free_pages(flags, get_order(size));
102 if (unlikely(!cpuaddr))
105 memset(cpuaddr, 0x0, size);
107 /* physical addr. of the memory we just got */
108 phys_addr = __pa(cpuaddr);
111 * 64 bit address translations should never fail.
112 * 32 bit translations can fail if there are insufficient mapping
116 *dma_handle = provider->dma_map_consistent(pdev, phys_addr, size);
118 printk(KERN_ERR "%s: out of ATEs\n", __FUNCTION__);
119 free_pages((unsigned long)cpuaddr, get_order(size));
125 EXPORT_SYMBOL(sn_dma_alloc_coherent);
128 * sn_pci_free_coherent - free memory associated with coherent DMAable region
129 * @dev: device to free for
130 * @size: size to free
131 * @cpu_addr: kernel virtual address to free
132 * @dma_handle: DMA address associated with this region
134 * Frees the memory allocated by dma_alloc_coherent(), potentially unmapping
135 * any associated IOMMU mappings.
137 void sn_dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
138 dma_addr_t dma_handle)
140 struct pci_dev *pdev = to_pci_dev(dev);
141 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
143 BUG_ON(dev->bus != &pci_bus_type);
145 provider->dma_unmap(pdev, dma_handle, 0);
146 free_pages((unsigned long)cpu_addr, get_order(size));
148 EXPORT_SYMBOL(sn_dma_free_coherent);
151 * sn_dma_map_single - map a single page for DMA
152 * @dev: device to map for
153 * @cpu_addr: kernel virtual address of the region to map
154 * @size: size of the region
155 * @direction: DMA direction
157 * Map the region pointed to by @cpu_addr for DMA and return the
160 * We map this to the one step pcibr_dmamap_trans interface rather than
161 * the two step pcibr_dmamap_alloc/pcibr_dmamap_addr because we have
162 * no way of saving the dmamap handle from the alloc to later free
163 * (which is pretty much unacceptable).
165 * TODO: simplify our interface;
166 * figure out how to save dmamap handle so can use two step.
168 dma_addr_t sn_dma_map_single(struct device *dev, void *cpu_addr, size_t size,
172 unsigned long phys_addr;
173 struct pci_dev *pdev = to_pci_dev(dev);
174 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
176 BUG_ON(dev->bus != &pci_bus_type);
178 phys_addr = __pa(cpu_addr);
179 dma_addr = provider->dma_map(pdev, phys_addr, size);
181 printk(KERN_ERR "%s: out of ATEs\n", __FUNCTION__);
186 EXPORT_SYMBOL(sn_dma_map_single);
189 * sn_dma_unmap_single - unamp a DMA mapped page
190 * @dev: device to sync
191 * @dma_addr: DMA address to sync
192 * @size: size of region
193 * @direction: DMA direction
195 * This routine is supposed to sync the DMA region specified
196 * by @dma_handle into the coherence domain. On SN, we're always cache
197 * coherent, so we just need to free any ATEs associated with this mapping.
199 void sn_dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
202 struct pci_dev *pdev = to_pci_dev(dev);
203 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
205 BUG_ON(dev->bus != &pci_bus_type);
207 provider->dma_unmap(pdev, dma_addr, direction);
209 EXPORT_SYMBOL(sn_dma_unmap_single);
212 * sn_dma_unmap_sg - unmap a DMA scatterlist
213 * @dev: device to unmap
214 * @sg: scatterlist to unmap
215 * @nhwentries: number of scatterlist entries
216 * @direction: DMA direction
218 * Unmap a set of streaming mode DMA translations.
220 void sn_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
221 int nhwentries, int direction)
224 struct pci_dev *pdev = to_pci_dev(dev);
225 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
227 BUG_ON(dev->bus != &pci_bus_type);
229 for (i = 0; i < nhwentries; i++, sg++) {
230 provider->dma_unmap(pdev, sg->dma_address, direction);
231 sg->dma_address = (dma_addr_t) NULL;
235 EXPORT_SYMBOL(sn_dma_unmap_sg);
238 * sn_dma_map_sg - map a scatterlist for DMA
239 * @dev: device to map for
240 * @sg: scatterlist to map
241 * @nhwentries: number of entries
242 * @direction: direction of the DMA transaction
244 * Maps each entry of @sg for DMA.
246 int sn_dma_map_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
249 unsigned long phys_addr;
250 struct scatterlist *saved_sg = sg;
251 struct pci_dev *pdev = to_pci_dev(dev);
252 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
255 BUG_ON(dev->bus != &pci_bus_type);
258 * Setup a DMA address for each entry in the scatterlist.
260 for (i = 0; i < nhwentries; i++, sg++) {
261 phys_addr = SG_ENT_PHYS_ADDRESS(sg);
262 sg->dma_address = provider->dma_map(pdev,
263 phys_addr, sg->length);
265 if (!sg->dma_address) {
266 printk(KERN_ERR "%s: out of ATEs\n", __FUNCTION__);
269 * Free any successfully allocated entries.
272 sn_dma_unmap_sg(dev, saved_sg, i, direction);
276 sg->dma_length = sg->length;
281 EXPORT_SYMBOL(sn_dma_map_sg);
283 void sn_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
284 size_t size, int direction)
286 BUG_ON(dev->bus != &pci_bus_type);
288 EXPORT_SYMBOL(sn_dma_sync_single_for_cpu);
290 void sn_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
291 size_t size, int direction)
293 BUG_ON(dev->bus != &pci_bus_type);
295 EXPORT_SYMBOL(sn_dma_sync_single_for_device);
297 void sn_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
298 int nelems, int direction)
300 BUG_ON(dev->bus != &pci_bus_type);
302 EXPORT_SYMBOL(sn_dma_sync_sg_for_cpu);
304 void sn_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
305 int nelems, int direction)
307 BUG_ON(dev->bus != &pci_bus_type);
309 EXPORT_SYMBOL(sn_dma_sync_sg_for_device);
311 int sn_dma_mapping_error(dma_addr_t dma_addr)
315 EXPORT_SYMBOL(sn_dma_mapping_error);
317 char *sn_pci_get_legacy_mem(struct pci_bus *bus)
319 if (!SN_PCIBUS_BUSSOFT(bus))
320 return ERR_PTR(-ENODEV);
322 return (char *)(SN_PCIBUS_BUSSOFT(bus)->bs_legacy_mem | __IA64_UNCACHED_OFFSET);
325 int sn_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
329 struct ia64_sal_retval isrv;
332 * First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work
333 * around hw issues at the pci bus level. SGI proms older than
334 * 4.10 don't implment this.
337 SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE,
338 pci_domain_nr(bus), bus->number,
341 port, size, __pa(val));
343 if (isrv.status == 0)
347 * If the above failed, retry using the SAL_PROBE call which should
348 * be present in all proms (but which cannot work round PCI chipset
349 * bugs). This code is retained for compatability with old
350 * pre-4.10 proms, and should be removed at some point in the future.
353 if (!SN_PCIBUS_BUSSOFT(bus))
356 addr = SN_PCIBUS_BUSSOFT(bus)->bs_legacy_io | __IA64_UNCACHED_OFFSET;
359 ret = ia64_sn_probe_mem(addr, (long)size, (void *)val);
370 int sn_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
375 struct ia64_sal_retval isrv;
378 * First, try the SN_SAL_IOIF_PCI_SAFE SAL call which can work
379 * around hw issues at the pci bus level. SGI proms older than
380 * 4.10 don't implment this.
383 SAL_CALL(isrv, SN_SAL_IOIF_PCI_SAFE,
384 pci_domain_nr(bus), bus->number,
387 port, size, __pa(&val));
389 if (isrv.status == 0)
393 * If the above failed, retry using the SAL_PROBE call which should
394 * be present in all proms (but which cannot work round PCI chipset
395 * bugs). This code is retained for compatability with old
396 * pre-4.10 proms, and should be removed at some point in the future.
399 if (!SN_PCIBUS_BUSSOFT(bus)) {
404 /* Put the phys addr in uncached space */
405 paddr = SN_PCIBUS_BUSSOFT(bus)->bs_legacy_io | __IA64_UNCACHED_OFFSET;
407 addr = (unsigned long *)paddr;
411 *(volatile u8 *)(addr) = (u8)(val);
414 *(volatile u16 *)(addr) = (u16)(val);
417 *(volatile u32 *)(addr) = (u32)(val);