1#ifndef __i386_PCI_H 2#define __i386_PCI_H 3 4#include <linux/config.h> 5 6#ifdef __KERNEL__ 7 8/* Can be used to override the logic in pci_scan_bus for skipping 9 already-configured bus numbers - to be used for buggy BIOSes 10 or architectures with incomplete PCI setup by the loader */ 11 12#ifdef CONFIG_PCI 13extern unsigned int pcibios_assign_all_busses(void); 14#else 15#define pcibios_assign_all_busses() 0 16#endif 17 18extern unsigned long pci_mem_start; 19#define PCIBIOS_MIN_IO 0x1000 20#define PCIBIOS_MIN_MEM (pci_mem_start) 21 22void pcibios_set_master(struct pci_dev *dev); 23void pcibios_penalize_isa_irq(int irq); 24struct irq_routing_table *pcibios_get_irq_routing_table(void); 25int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq); 26 27/* Dynamic DMA mapping stuff. 28 * i386 has everything mapped statically. 29 */ 30 31#include <linux/types.h> 32#include <linux/slab.h> 33#include <asm/scatterlist.h> 34#include <linux/string.h> 35#include <asm/io.h> 36 37struct pci_dev; 38 39/* The PCI address space does equal the physical memory 40 * address space. The networking and block device layers use 41 * this boolean for bounce buffer decisions. 42 */ 43#define PCI_DMA_BUS_IS_PHYS (1) 44 45/* Allocate and map kernel buffer using consistent mode DMA for a device. 46 * hwdev should be valid struct pci_dev pointer for PCI devices, 47 * NULL for PCI-like buses (ISA, EISA). 48 * Returns non-NULL cpu-view pointer to the buffer if successful and 49 * sets *dma_addrp to the pci side dma address as well, else *dma_addrp 50 * is undefined. 51 */ 52extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, 53 dma_addr_t *dma_handle); 54 55/* Free and unmap a consistent DMA buffer. 56 * cpu_addr is what was returned from pci_alloc_consistent, 57 * size must be the same as what as passed into pci_alloc_consistent, 58 * and likewise dma_addr must be the same as what *dma_addrp was set to. 59 * 60 * References to the memory and mappings associated with cpu_addr/dma_addr 61 * past this call are illegal. 62 */ 63extern void pci_free_consistent(struct pci_dev *hwdev, size_t size, 64 void *vaddr, dma_addr_t dma_handle); 65 66/* Map a single buffer of the indicated size for DMA in streaming mode. 67 * The 32-bit bus address to use is returned. 68 * 69 * Once the device is given the dma address, the device owns this memory 70 * until either pci_unmap_single or pci_dma_sync_single is performed. 71 */ 72static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, 73 size_t size, int direction) 74{ 75 if (direction == PCI_DMA_NONE) 76 out_of_line_bug(); 77 flush_write_buffers(); 78 return virt_to_bus(ptr); 79} 80 81/* Unmap a single streaming mode DMA translation. The dma_addr and size 82 * must match what was provided for in a previous pci_map_single call. All 83 * other usages are undefined. 84 * 85 * After this call, reads by the cpu to the buffer are guarenteed to see 86 * whatever the device wrote there. 87 */ 88static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, 89 size_t size, int direction) 90{ 91 if (direction == PCI_DMA_NONE) 92 out_of_line_bug(); 93 /* Nothing to do */ 94} 95 96/* 97 * pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical 98 * to pci_map_single, but takes a struct page instead of a virtual address 99 */ 100static inline dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page, 101 unsigned long offset, size_t size, int direction) 102{ 103 if (direction == PCI_DMA_NONE) 104 out_of_line_bug(); 105 106 return (dma_addr_t)(page - mem_map) * PAGE_SIZE + offset; 107} 108 109static inline void pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address, 110 size_t size, int direction) 111{ 112 if (direction == PCI_DMA_NONE) 113 out_of_line_bug(); 114 /* Nothing to do */ 115} 116 117/* pci_unmap_{page,single} is a nop so... */ 118#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) 119#define DECLARE_PCI_UNMAP_LEN(LEN_NAME) 120#define pci_unmap_addr(PTR, ADDR_NAME) (0) 121#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0) 122#define pci_unmap_len(PTR, LEN_NAME) (0) 123#define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) 124 125/* Map a set of buffers described by scatterlist in streaming 126 * mode for DMA. This is the scather-gather version of the 127 * above pci_map_single interface. Here the scatter gather list 128 * elements are each tagged with the appropriate dma address 129 * and length. They are obtained via sg_dma_{address,length}(SG). 130 * 131 * NOTE: An implementation may be able to use a smaller number of 132 * DMA address/length pairs than there are SG table elements. 133 * (for example via virtual mapping capabilities) 134 * The routine returns the number of addr/length pairs actually 135 * used, at most nents. 136 * 137 * Device ownership issues as mentioned above for pci_map_single are 138 * the same here. 139 */ 140static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, 141 int nents, int direction) 142{ 143 int i; 144 145 if (direction == PCI_DMA_NONE) 146 out_of_line_bug(); 147 148 /* 149 * temporary 2.4 hack 150 */ 151 for (i = 0; i < nents; i++ ) { 152 if (sg[i].address && sg[i].page) 153 out_of_line_bug(); 154 else if (!sg[i].address && !sg[i].page) 155 out_of_line_bug(); 156 157 if (sg[i].address) 158 sg[i].dma_address = virt_to_bus(sg[i].address); 159 else 160 sg[i].dma_address = page_to_bus(sg[i].page) + sg[i].offset; 161 } 162 163 flush_write_buffers(); 164 return nents; 165} 166 167/* Unmap a set of streaming mode DMA translations. 168 * Again, cpu read rules concerning calls here are the same as for 169 * pci_unmap_single() above. 170 */ 171static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, 172 int nents, int direction) 173{ 174 if (direction == PCI_DMA_NONE) 175 out_of_line_bug(); 176 /* Nothing to do */ 177} 178 179/* Make physical memory consistent for a single 180 * streaming mode DMA translation after a transfer. 181 * 182 * If you perform a pci_map_single() but wish to interrogate the 183 * buffer using the cpu, yet do not wish to teardown the PCI dma 184 * mapping, you must call this function before doing so. At the 185 * next point you give the PCI dma address back to the card, the 186 * device again owns the buffer. 187 */ 188static inline void pci_dma_sync_single(struct pci_dev *hwdev, 189 dma_addr_t dma_handle, 190 size_t size, int direction) 191{ 192 if (direction == PCI_DMA_NONE) 193 out_of_line_bug(); 194 flush_write_buffers(); 195} 196 197/* Make physical memory consistent for a set of streaming 198 * mode DMA translations after a transfer. 199 * 200 * The same as pci_dma_sync_single but for a scatter-gather list, 201 * same rules and usage. 202 */ 203static inline void pci_dma_sync_sg(struct pci_dev *hwdev, 204 struct scatterlist *sg, 205 int nelems, int direction) 206{ 207 if (direction == PCI_DMA_NONE) 208 out_of_line_bug(); 209 flush_write_buffers(); 210} 211 212/* Return whether the given PCI device DMA address mask can 213 * be supported properly. For example, if your device can 214 * only drive the low 24-bits during PCI bus mastering, then 215 * you would pass 0x00ffffff as the mask to this function. 216 */ 217static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask) 218{ 219 /* 220 * we fall back to GFP_DMA when the mask isn't all 1s, 221 * so we can't guarantee allocations that must be 222 * within a tighter range than GFP_DMA.. 223 */ 224 if(mask < 0x00ffffff) 225 return 0; 226 227 return 1; 228} 229 230/* This is always fine. */ 231#define pci_dac_dma_supported(pci_dev, mask) (1) 232 233static __inline__ dma64_addr_t 234pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction) 235{ 236 return ((dma64_addr_t) page_to_bus(page) + 237 (dma64_addr_t) offset); 238} 239 240static __inline__ struct page * 241pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr) 242{ 243 unsigned long poff = (dma_addr >> PAGE_SHIFT); 244 245 return mem_map + poff; 246} 247 248static __inline__ unsigned long 249pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr) 250{ 251 return (dma_addr & ~PAGE_MASK); 252} 253 254static __inline__ void 255pci_dac_dma_sync_single(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction) 256{ 257 flush_write_buffers(); 258} 259 260/* These macros should be used after a pci_map_sg call has been done 261 * to get bus addresses of each of the SG entries and their lengths. 262 * You should only work with the number of sg entries pci_map_sg 263 * returns. 264 */ 265#define sg_dma_address(sg) ((sg)->dma_address) 266#define sg_dma_len(sg) ((sg)->length) 267 268/* Return the index of the PCI controller for device. */ 269static inline int pci_controller_num(struct pci_dev *dev) 270{ 271 return 0; 272} 273 274#define HAVE_PCI_MMAP 275extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, 276 enum pci_mmap_state mmap_state, int write_combine); 277 278#endif /* __KERNEL__ */ 279 280#endif /* __i386_PCI_H */ 281