1/* 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 4 * for more details. 5 */ 6#ifndef _ASM_PCI_H 7#define _ASM_PCI_H 8 9#include <linux/config.h> 10 11#ifdef __KERNEL__ 12 13/* Can be used to override the logic in pci_scan_bus for skipping 14 already-configured bus numbers - to be used for buggy BIOSes 15 or architectures with incomplete PCI setup by the loader */ 16 17#ifdef CONFIG_PCI 18extern unsigned int pcibios_assign_all_busses(void); 19#else 20#define pcibios_assign_all_busses() 0 21#endif 22 23#define PCIBIOS_MIN_IO 0x1000 24#define PCIBIOS_MIN_MEM 0x10000000 25 26static inline void pcibios_set_master(struct pci_dev *dev) 27{ 28 /* No special bus mastering setup handling */ 29} 30 31static inline void pcibios_penalize_isa_irq(int irq) 32{ 33 /* We don't do dynamic PCI IRQ allocation */ 34} 35 36/* 37 * Dynamic DMA mapping stuff. 38 * MIPS has everything mapped statically. 39 */ 40 41#include <linux/types.h> 42#include <linux/slab.h> 43#include <asm/scatterlist.h> 44#include <linux/string.h> 45#include <asm/io.h> 46 47#if (defined(CONFIG_DDB5074) || defined(CONFIG_DDB5476)) 48#undef PCIBIOS_MIN_IO 49#undef PCIBIOS_MIN_MEM 50#define PCIBIOS_MIN_IO 0x0100000 51#define PCIBIOS_MIN_MEM 0x1000000 52#endif 53 54struct pci_dev; 55 56/* 57 * The PCI address space does equal the physical memory address space. The 58 * networking and block device layers use this boolean for bounce buffer 59 * decisions. 60 */ 61#define PCI_DMA_BUS_IS_PHYS (1) 62 63/* 64 * Allocate and map kernel buffer using consistent mode DMA for a device. 65 * hwdev should be valid struct pci_dev pointer for PCI devices, 66 * NULL for PCI-like buses (ISA, EISA). 67 * Returns non-NULL cpu-view pointer to the buffer if successful and 68 * sets *dma_addrp to the pci side dma address as well, else *dma_addrp 69 * is undefined. 70 */ 71extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, 72 dma_addr_t *dma_handle); 73 74/* 75 * Free and unmap a consistent DMA buffer. 76 * cpu_addr is what was returned from pci_alloc_consistent, 77 * size must be the same as what as passed into pci_alloc_consistent, 78 * and likewise dma_addr must be the same as what *dma_addrp was set to. 79 * 80 * References to the memory and mappings associated with cpu_addr/dma_addr 81 * past this call are illegal. 82 */ 83extern void pci_free_consistent(struct pci_dev *hwdev, size_t size, 84 void *vaddr, dma_addr_t dma_handle); 85 86/* 87 * Map a single buffer of the indicated size for DMA in streaming mode. 88 * The 32-bit bus address to use is returned. 89 * 90 * Once the device is given the dma address, the device owns this memory 91 * until either pci_unmap_single or pci_dma_sync_single is performed. 92 */ 93static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, 94 size_t size, int direction) 95{ 96 unsigned long addr = (unsigned long) ptr; 97 98 if (direction == PCI_DMA_NONE) 99 out_of_line_bug(); 100 101 dma_cache_wback_inv(addr, size); 102 103 return bus_to_baddr(hwdev->bus, __pa(ptr)); 104} 105 106/* 107 * Unmap a single streaming mode DMA translation. The dma_addr and size 108 * must match what was provided for in a previous pci_map_single call. All 109 * other usages are undefined. 110 * 111 * After this call, reads by the cpu to the buffer are guarenteed to see 112 * whatever the device wrote there. 113 */ 114static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, 115 size_t size, int direction) 116{ 117 if (direction == PCI_DMA_NONE) 118 out_of_line_bug(); 119 120 /* Nothing to do */ 121} 122 123/* 124 * pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical 125 * to pci_map_single, but takes a struct page instead of a virtual address 126 */ 127static inline dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page, 128 unsigned long offset, size_t size, 129 int direction) 130{ 131 unsigned long addr; 132 133 if (direction == PCI_DMA_NONE) 134 out_of_line_bug(); 135 136 addr = (unsigned long) page_address(page) + offset; 137 dma_cache_wback_inv(addr, size); 138 139 return bus_to_baddr(hwdev->bus, page_to_phys(page) + offset); 140} 141 142static inline void pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address, 143 size_t size, int direction) 144{ 145 if (direction == PCI_DMA_NONE) 146 out_of_line_bug(); 147 148 if (direction != PCI_DMA_TODEVICE) { 149 unsigned long addr; 150 151 addr = baddr_to_bus(hwdev->bus, dma_address) + PAGE_OFFSET; 152 dma_cache_wback_inv(addr, size); 153 } 154} 155 156/* pci_unmap_{page,single} is a nop so... */ 157#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) 158#define DECLARE_PCI_UNMAP_LEN(LEN_NAME) 159#define pci_unmap_addr(PTR, ADDR_NAME) (0) 160#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0) 161#define pci_unmap_len(PTR, LEN_NAME) (0) 162#define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) 163 164/* 165 * Map a set of buffers described by scatterlist in streaming 166 * mode for DMA. This is the scather-gather version of the 167 * above pci_map_single interface. Here the scatter gather list 168 * elements are each tagged with the appropriate dma address 169 * and length. They are obtained via sg_dma_{address,length}(SG). 170 * 171 * NOTE: An implementation may be able to use a smaller number of 172 * DMA address/length pairs than there are SG table elements. 173 * (for example via virtual mapping capabilities) 174 * The routine returns the number of addr/length pairs actually 175 * used, at most nents. 176 * 177 * Device ownership issues as mentioned above for pci_map_single are 178 * the same here. 179 */ 180static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, 181 int nents, int direction) 182{ 183 int i; 184 185 if (direction == PCI_DMA_NONE) 186 out_of_line_bug(); 187 188 for (i = 0; i < nents; i++, sg++) { 189 if (sg->address && sg->page) 190 out_of_line_bug(); 191 else if (!sg->address && !sg->page) 192 out_of_line_bug(); 193 194 if (sg->address) { 195 dma_cache_wback_inv((unsigned long)sg->address, 196 sg->length); 197 sg->dma_address = bus_to_baddr(hwdev->bus, __pa(sg->address)); 198 } else { 199 sg->dma_address = page_to_bus(sg->page) + 200 sg->offset; 201 dma_cache_wback_inv((unsigned long)page_address(sg->page) + sg->offset, 202 sg->length); 203 } 204 } 205 206 return nents; 207} 208 209/* 210 * Unmap a set of streaming mode DMA translations. 211 * Again, cpu read rules concerning calls here are the same as for 212 * pci_unmap_single() above. 213 */ 214static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, 215 int nents, int direction) 216{ 217 int i; 218 219 if (direction == PCI_DMA_NONE) 220 out_of_line_bug(); 221 222 if (direction == PCI_DMA_TODEVICE) 223 return; 224 225 for (i = 0; i < nents; i++, sg++) { 226 if (sg->address && sg->page) 227 out_of_line_bug(); 228 else if (!sg->address && !sg->page) 229 out_of_line_bug(); 230 231 if (!sg->address) 232 continue; 233 dma_cache_wback_inv((unsigned long)sg->address, sg->length); 234 } 235} 236 237/* 238 * Make physical memory consistent for a single 239 * streaming mode DMA translation after a transfer. 240 * 241 * If you perform a pci_map_single() but wish to interrogate the 242 * buffer using the cpu, yet do not wish to teardown the PCI dma 243 * mapping, you must call this function before doing so. At the 244 * next point you give the PCI dma address back to the card, the 245 * device again owns the buffer. 246 */ 247static inline void pci_dma_sync_single(struct pci_dev *hwdev, 248 dma_addr_t dma_handle, 249 size_t size, int direction) 250{ 251 unsigned long addr; 252 253 if (direction == PCI_DMA_NONE) 254 out_of_line_bug(); 255 256 addr = baddr_to_bus(hwdev->bus, dma_handle) + PAGE_OFFSET; 257 dma_cache_wback_inv(addr, size); 258} 259 260/* 261 * Make physical memory consistent for a set of streaming 262 * mode DMA translations after a transfer. 263 * 264 * The same as pci_dma_sync_single but for a scatter-gather list, 265 * same rules and usage. 266 */ 267static inline void pci_dma_sync_sg(struct pci_dev *hwdev, 268 struct scatterlist *sg, 269 int nelems, int direction) 270{ 271#ifdef CONFIG_NONCOHERENT_IO 272 int i; 273#endif 274 275 if (direction == PCI_DMA_NONE) 276 out_of_line_bug(); 277 278 /* Make sure that gcc doesn't leave the empty loop body. */ 279#ifdef CONFIG_NONCOHERENT_IO 280 for (i = 0; i < nelems; i++, sg++) 281 dma_cache_wback_inv((unsigned long)sg->address, sg->length); 282#endif 283} 284 285/* 286 * Return whether the given PCI device DMA address mask can 287 * be supported properly. For example, if your device can 288 * only drive the low 24-bits during PCI bus mastering, then 289 * you would pass 0x00ffffff as the mask to this function. 290 */ 291static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask) 292{ 293 /* 294 * we fall back to GFP_DMA when the mask isn't all 1s, 295 * so we can't guarantee allocations that must be 296 * within a tighter range than GFP_DMA.. 297 */ 298#ifdef CONFIG_ISA 299 if (mask < 0x00ffffff) 300 return 0; 301#endif 302 303 return 1; 304} 305 306/* This is always fine. */ 307#define pci_dac_dma_supported(pci_dev, mask) (1) 308 309static inline dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev, 310 struct page *page, unsigned long offset, int direction) 311{ 312 dma64_addr_t addr = page_to_phys(page) + offset; 313 314 return (dma64_addr_t) bus_to_baddr(pdev->bus, addr); 315} 316 317static inline struct page *pci_dac_dma_to_page(struct pci_dev *pdev, 318 dma64_addr_t dma_addr) 319{ 320 unsigned long poff = baddr_to_bus(pdev->bus, dma_addr) >> PAGE_SHIFT; 321 322 return mem_map + poff; 323} 324 325static inline unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev, 326 dma64_addr_t dma_addr) 327{ 328 return dma_addr & ~PAGE_MASK; 329} 330 331static inline void pci_dac_dma_sync_single(struct pci_dev *pdev, 332 dma64_addr_t dma_addr, size_t len, int direction) 333{ 334 unsigned long addr; 335 336 if (direction == PCI_DMA_NONE) 337 BUG(); 338 339 addr = baddr_to_bus(pdev->bus, dma_addr) + PAGE_OFFSET; 340 dma_cache_wback_inv(addr, len); 341} 342 343/* 344 * Return the index of the PCI controller for device. 345 */ 346#define pci_controller_num(pdev) (0) 347 348/* 349 * These macros should be used after a pci_map_sg call has been done 350 * to get bus addresses of each of the SG entries and their lengths. 351 * You should only work with the number of sg entries pci_map_sg 352 * returns, or alternatively stop on the first sg_dma_len(sg) which 353 * is 0. 354 */ 355#define sg_dma_address(sg) ((sg)->dma_address) 356#define sg_dma_len(sg) ((sg)->length) 357 358#endif /* __KERNEL__ */ 359 360#endif /* _ASM_PCI_H */ 361