1 /* SPDX-License-Identifier: GPL-2.0-only */ !! 1 #ifndef __i386_PCI_H
>> 2 #define __i386_PCI_H
2 3
3 #ifndef __ASM_GENERIC_PCI_H !! 4 #include <linux/config.h>
4 #define __ASM_GENERIC_PCI_H <<
5 5
6 #ifndef PCIBIOS_MIN_IO !! 6 #ifdef __KERNEL__
7 #define PCIBIOS_MIN_IO 0 <<
8 #endif <<
9 7
10 #ifndef PCIBIOS_MIN_MEM !! 8 /* Can be used to override the logic in pci_scan_bus for skipping
11 #define PCIBIOS_MIN_MEM 0 !! 9 already-configured bus numbers - to be used for buggy BIOSes
12 #endif !! 10 or architectures with incomplete PCI setup by the loader */
13 11
14 #ifndef pcibios_assign_all_busses !! 12 #ifdef CONFIG_PCI
15 /* For bootloaders that do not initialize the !! 13 extern unsigned int pcibios_assign_all_busses(void);
16 #define pcibios_assign_all_busses() 1 !! 14 #else
>> 15 #define pcibios_assign_all_busses() 0
17 #endif 16 #endif
>> 17 #define pcibios_scan_all_fns() 0
>> 18
>> 19 extern unsigned long pci_mem_start;
>> 20 #define PCIBIOS_MIN_IO 0x1000
>> 21 #define PCIBIOS_MIN_MEM (pci_mem_start)
>> 22
>> 23 void pcibios_config_init(void);
>> 24 struct pci_bus * pcibios_scan_root(int bus);
>> 25 extern int (*pci_config_read)(int seg, int bus, int dev, int fn, int reg, int len, u32 *value);
>> 26 extern int (*pci_config_write)(int seg, int bus, int dev, int fn, int reg, int len, u32 value);
>> 27
>> 28 void pcibios_set_master(struct pci_dev *dev);
>> 29 void pcibios_penalize_isa_irq(int irq);
>> 30 struct irq_routing_table *pcibios_get_irq_routing_table(void);
>> 31 int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);
>> 32
>> 33 /* Dynamic DMA mapping stuff.
>> 34 * i386 has everything mapped statically.
>> 35 */
>> 36
>> 37 #include <linux/types.h>
>> 38 #include <linux/slab.h>
>> 39 #include <asm/scatterlist.h>
>> 40 #include <linux/string.h>
>> 41 #include <asm/io.h>
>> 42
>> 43 struct pci_dev;
>> 44
>> 45 /* The PCI address space does equal the physical memory
>> 46 * address space. The networking and block device layers use
>> 47 * this boolean for bounce buffer decisions.
>> 48 */
>> 49 #define PCI_DMA_BUS_IS_PHYS (1)
>> 50
>> 51 /* Allocate and map kernel buffer using consistent mode DMA for a device.
>> 52 * hwdev should be valid struct pci_dev pointer for PCI devices,
>> 53 * NULL for PCI-like buses (ISA, EISA).
>> 54 * Returns non-NULL cpu-view pointer to the buffer if successful and
>> 55 * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
>> 56 * is undefined.
>> 57 */
>> 58 extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
>> 59 dma_addr_t *dma_handle);
>> 60
>> 61 /* Free and unmap a consistent DMA buffer.
>> 62 * cpu_addr is what was returned from pci_alloc_consistent,
>> 63 * size must be the same as what as passed into pci_alloc_consistent,
>> 64 * and likewise dma_addr must be the same as what *dma_addrp was set to.
>> 65 *
>> 66 * References to the memory and mappings associated with cpu_addr/dma_addr
>> 67 * past this call are illegal.
>> 68 */
>> 69 extern void pci_free_consistent(struct pci_dev *hwdev, size_t size,
>> 70 void *vaddr, dma_addr_t dma_handle);
>> 71
>> 72 /* Map a single buffer of the indicated size for DMA in streaming mode.
>> 73 * The 32-bit bus address to use is returned.
>> 74 *
>> 75 * Once the device is given the dma address, the device owns this memory
>> 76 * until either pci_unmap_single or pci_dma_sync_single is performed.
>> 77 */
>> 78 static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
>> 79 size_t size, int direction)
>> 80 {
>> 81 if (direction == PCI_DMA_NONE)
>> 82 out_of_line_bug();
>> 83 flush_write_buffers();
>> 84 return virt_to_bus(ptr);
>> 85 }
>> 86
>> 87 /* Unmap a single streaming mode DMA translation. The dma_addr and size
>> 88 * must match what was provided for in a previous pci_map_single call. All
>> 89 * other usages are undefined.
>> 90 *
>> 91 * After this call, reads by the cpu to the buffer are guarenteed to see
>> 92 * whatever the device wrote there.
>> 93 */
>> 94 static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
>> 95 size_t size, int direction)
>> 96 {
>> 97 if (direction == PCI_DMA_NONE)
>> 98 out_of_line_bug();
>> 99 /* Nothing to do */
>> 100 }
>> 101
>> 102 /*
>> 103 * pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical
>> 104 * to pci_map_single, but takes a struct page instead of a virtual address
>> 105 */
>> 106 static inline dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
>> 107 unsigned long offset, size_t size, int direction)
>> 108 {
>> 109 if (direction == PCI_DMA_NONE)
>> 110 out_of_line_bug();
>> 111
>> 112 return ((dma_addr_t)(page - mem_map) *
>> 113 (dma_addr_t) PAGE_SIZE +
>> 114 (dma_addr_t) offset);
>> 115 }
>> 116
>> 117 static inline void pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
>> 118 size_t size, int direction)
>> 119 {
>> 120 if (direction == PCI_DMA_NONE)
>> 121 out_of_line_bug();
>> 122 /* Nothing to do */
>> 123 }
>> 124
>> 125 /* pci_unmap_{page,single} is a nop so... */
>> 126 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
>> 127 #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
>> 128 #define pci_unmap_addr(PTR, ADDR_NAME) (0)
>> 129 #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
>> 130 #define pci_unmap_len(PTR, LEN_NAME) (0)
>> 131 #define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
>> 132
>> 133 /* Map a set of buffers described by scatterlist in streaming
>> 134 * mode for DMA. This is the scather-gather version of the
>> 135 * above pci_map_single interface. Here the scatter gather list
>> 136 * elements are each tagged with the appropriate dma address
>> 137 * and length. They are obtained via sg_dma_{address,length}(SG).
>> 138 *
>> 139 * NOTE: An implementation may be able to use a smaller number of
>> 140 * DMA address/length pairs than there are SG table elements.
>> 141 * (for example via virtual mapping capabilities)
>> 142 * The routine returns the number of addr/length pairs actually
>> 143 * used, at most nents.
>> 144 *
>> 145 * Device ownership issues as mentioned above for pci_map_single are
>> 146 * the same here.
>> 147 */
>> 148 static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
>> 149 int nents, int direction)
>> 150 {
>> 151 int i;
>> 152
>> 153 if (direction == PCI_DMA_NONE)
>> 154 out_of_line_bug();
>> 155
>> 156 /*
>> 157 * temporary 2.4 hack
>> 158 */
>> 159 for (i = 0; i < nents; i++ ) {
>> 160 if (sg[i].address && sg[i].page)
>> 161 out_of_line_bug();
>> 162 else if (!sg[i].address && !sg[i].page)
>> 163 out_of_line_bug();
>> 164
>> 165 if (sg[i].address)
>> 166 sg[i].dma_address = virt_to_bus(sg[i].address);
>> 167 else
>> 168 sg[i].dma_address = page_to_bus(sg[i].page) + sg[i].offset;
>> 169 }
>> 170
>> 171 flush_write_buffers();
>> 172 return nents;
>> 173 }
18 174
19 /* Enable generic resource mapping code in dri !! 175 /* Unmap a set of streaming mode DMA translations.
20 #define ARCH_GENERIC_PCI_MMAP_RESOURCE !! 176 * Again, cpu read rules concerning calls here are the same as for
>> 177 * pci_unmap_single() above.
>> 178 */
>> 179 static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
>> 180 int nents, int direction)
>> 181 {
>> 182 if (direction == PCI_DMA_NONE)
>> 183 out_of_line_bug();
>> 184 /* Nothing to do */
>> 185 }
>> 186
>> 187 /* Make physical memory consistent for a single
>> 188 * streaming mode DMA translation after a transfer.
>> 189 *
>> 190 * If you perform a pci_map_single() but wish to interrogate the
>> 191 * buffer using the cpu, yet do not wish to teardown the PCI dma
>> 192 * mapping, you must call this function before doing so. At the
>> 193 * next point you give the PCI dma address back to the card, the
>> 194 * device again owns the buffer.
>> 195 */
>> 196 static inline void pci_dma_sync_single(struct pci_dev *hwdev,
>> 197 dma_addr_t dma_handle,
>> 198 size_t size, int direction)
>> 199 {
>> 200 if (direction == PCI_DMA_NONE)
>> 201 out_of_line_bug();
>> 202 flush_write_buffers();
>> 203 }
>> 204
>> 205 /* Make physical memory consistent for a set of streaming
>> 206 * mode DMA translations after a transfer.
>> 207 *
>> 208 * The same as pci_dma_sync_single but for a scatter-gather list,
>> 209 * same rules and usage.
>> 210 */
>> 211 static inline void pci_dma_sync_sg(struct pci_dev *hwdev,
>> 212 struct scatterlist *sg,
>> 213 int nelems, int direction)
>> 214 {
>> 215 if (direction == PCI_DMA_NONE)
>> 216 out_of_line_bug();
>> 217 flush_write_buffers();
>> 218 }
21 219
22 #ifdef CONFIG_PCI_DOMAINS !! 220 /* Return whether the given PCI device DMA address mask can
23 static inline int pci_proc_domain(struct pci_b !! 221 * be supported properly. For example, if your device can
>> 222 * only drive the low 24-bits during PCI bus mastering, then
>> 223 * you would pass 0x00ffffff as the mask to this function.
>> 224 */
>> 225 static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
24 { 226 {
25 /* always show the domain in /proc */ !! 227 /*
>> 228 * we fall back to GFP_DMA when the mask isn't all 1s,
>> 229 * so we can't guarantee allocations that must be
>> 230 * within a tighter range than GFP_DMA..
>> 231 */
>> 232 if(mask < 0x00ffffff)
>> 233 return 0;
>> 234
26 return 1; 235 return 1;
27 } 236 }
28 #endif /* CONFIG_PCI_DOMAINS */ <<
29 237
30 #endif /* __ASM_GENERIC_PCI_H */ !! 238 /* This is always fine. */
>> 239 #define pci_dac_dma_supported(pci_dev, mask) (1)
>> 240
>> 241 static __inline__ dma64_addr_t
>> 242 pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
>> 243 {
>> 244 return ((dma64_addr_t) page_to_bus(page) +
>> 245 (dma64_addr_t) offset);
>> 246 }
>> 247
>> 248 static __inline__ struct page *
>> 249 pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
>> 250 {
>> 251 unsigned long poff = (dma_addr >> PAGE_SHIFT);
>> 252
>> 253 return mem_map + poff;
>> 254 }
>> 255
>> 256 static __inline__ unsigned long
>> 257 pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
>> 258 {
>> 259 return (dma_addr & ~PAGE_MASK);
>> 260 }
>> 261
>> 262 static __inline__ void
>> 263 pci_dac_dma_sync_single(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
>> 264 {
>> 265 flush_write_buffers();
>> 266 }
>> 267
>> 268 /* These macros should be used after a pci_map_sg call has been done
>> 269 * to get bus addresses of each of the SG entries and their lengths.
>> 270 * You should only work with the number of sg entries pci_map_sg
>> 271 * returns.
>> 272 */
>> 273 #define sg_dma_address(sg) ((sg)->dma_address)
>> 274 #define sg_dma_len(sg) ((sg)->length)
>> 275
>> 276 /* Return the index of the PCI controller for device. */
>> 277 static inline int pci_controller_num(struct pci_dev *dev)
>> 278 {
>> 279 return 0;
>> 280 }
>> 281
>> 282 #define HAVE_PCI_MMAP
>> 283 extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
>> 284 enum pci_mmap_state mmap_state, int write_combine);
>> 285
>> 286 #endif /* __KERNEL__ */
>> 287
>> 288 #endif /* __i386_PCI_H */
31 289
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