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 * Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com> 7 * Copyright (C) 2000, 2001 Ralf Baechle <ralf@gnu.org> 8 * Copyright (C) 2005 Ilya A. Volynets-Evenbakh <ilya@total-knowledge.com> 9 * swiped from i386, and cloned for MIPS by Geert, polished by Ralf. 10 * IP32 changes by Ilya. 11 * Copyright (C) 2010 Cavium Networks, Inc. 12 */ 13 #include <linux/dma-mapping.h> 14 #include <linux/scatterlist.h> 15 #include <linux/bootmem.h> 16 #include <linux/export.h> 17 #include <linux/swiotlb.h> 18 #include <linux/types.h> 19 #include <linux/init.h> 20 #include <linux/mm.h> 21 22 #include <asm/bootinfo.h> 23 24 #include <asm/octeon/octeon.h> 25 26 #ifdef CONFIG_PCI 27 #include <asm/octeon/pci-octeon.h> 28 #include <asm/octeon/cvmx-npi-defs.h> 29 #include <asm/octeon/cvmx-pci-defs.h> 30 31 static dma_addr_t octeon_hole_phys_to_dma(phys_addr_t paddr) 32 { 33 if (paddr >= CVMX_PCIE_BAR1_PHYS_BASE && paddr < (CVMX_PCIE_BAR1_PHYS_BASE + CVMX_PCIE_BAR1_PHYS_SIZE)) 34 return paddr - CVMX_PCIE_BAR1_PHYS_BASE + CVMX_PCIE_BAR1_RC_BASE; 35 else 36 return paddr; 37 } 38 39 static phys_addr_t octeon_hole_dma_to_phys(dma_addr_t daddr) 40 { 41 if (daddr >= CVMX_PCIE_BAR1_RC_BASE) 42 return daddr + CVMX_PCIE_BAR1_PHYS_BASE - CVMX_PCIE_BAR1_RC_BASE; 43 else 44 return daddr; 45 } 46 47 static dma_addr_t octeon_gen1_phys_to_dma(struct device *dev, phys_addr_t paddr) 48 { 49 if (paddr >= 0x410000000ull && paddr < 0x420000000ull) 50 paddr -= 0x400000000ull; 51 return octeon_hole_phys_to_dma(paddr); 52 } 53 54 static phys_addr_t octeon_gen1_dma_to_phys(struct device *dev, dma_addr_t daddr) 55 { 56 daddr = octeon_hole_dma_to_phys(daddr); 57 58 if (daddr >= 0x10000000ull && daddr < 0x20000000ull) 59 daddr += 0x400000000ull; 60 61 return daddr; 62 } 63 64 static dma_addr_t octeon_gen2_phys_to_dma(struct device *dev, phys_addr_t paddr) 65 { 66 return octeon_hole_phys_to_dma(paddr); 67 } 68 69 static phys_addr_t octeon_gen2_dma_to_phys(struct device *dev, dma_addr_t daddr) 70 { 71 return octeon_hole_dma_to_phys(daddr); 72 } 73 74 static dma_addr_t octeon_big_phys_to_dma(struct device *dev, phys_addr_t paddr) 75 { 76 if (paddr >= 0x410000000ull && paddr < 0x420000000ull) 77 paddr -= 0x400000000ull; 78 79 /* Anything in the BAR1 hole or above goes via BAR2 */ 80 if (paddr >= 0xf0000000ull) 81 paddr = OCTEON_BAR2_PCI_ADDRESS + paddr; 82 83 return paddr; 84 } 85 86 static phys_addr_t octeon_big_dma_to_phys(struct device *dev, dma_addr_t daddr) 87 { 88 if (daddr >= OCTEON_BAR2_PCI_ADDRESS) 89 daddr -= OCTEON_BAR2_PCI_ADDRESS; 90 91 if (daddr >= 0x10000000ull && daddr < 0x20000000ull) 92 daddr += 0x400000000ull; 93 return daddr; 94 } 95 96 static dma_addr_t octeon_small_phys_to_dma(struct device *dev, 97 phys_addr_t paddr) 98 { 99 if (paddr >= 0x410000000ull && paddr < 0x420000000ull) 100 paddr -= 0x400000000ull; 101 102 /* Anything not in the BAR1 range goes via BAR2 */ 103 if (paddr >= octeon_bar1_pci_phys && paddr < octeon_bar1_pci_phys + 0x8000000ull) 104 paddr = paddr - octeon_bar1_pci_phys; 105 else 106 paddr = OCTEON_BAR2_PCI_ADDRESS + paddr; 107 108 return paddr; 109 } 110 111 static phys_addr_t octeon_small_dma_to_phys(struct device *dev, 112 dma_addr_t daddr) 113 { 114 if (daddr >= OCTEON_BAR2_PCI_ADDRESS) 115 daddr -= OCTEON_BAR2_PCI_ADDRESS; 116 else 117 daddr += octeon_bar1_pci_phys; 118 119 if (daddr >= 0x10000000ull && daddr < 0x20000000ull) 120 daddr += 0x400000000ull; 121 return daddr; 122 } 123 124 #endif /* CONFIG_PCI */ 125 126 static dma_addr_t octeon_dma_map_page(struct device *dev, struct page *page, 127 unsigned long offset, size_t size, enum dma_data_direction direction, 128 struct dma_attrs *attrs) 129 { 130 dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size, 131 direction, attrs); 132 mb(); 133 134 return daddr; 135 } 136 137 static int octeon_dma_map_sg(struct device *dev, struct scatterlist *sg, 138 int nents, enum dma_data_direction direction, struct dma_attrs *attrs) 139 { 140 int r = swiotlb_map_sg_attrs(dev, sg, nents, direction, attrs); 141 mb(); 142 return r; 143 } 144 145 static void octeon_dma_sync_single_for_device(struct device *dev, 146 dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) 147 { 148 swiotlb_sync_single_for_device(dev, dma_handle, size, direction); 149 mb(); 150 } 151 152 static void octeon_dma_sync_sg_for_device(struct device *dev, 153 struct scatterlist *sg, int nelems, enum dma_data_direction direction) 154 { 155 swiotlb_sync_sg_for_device(dev, sg, nelems, direction); 156 mb(); 157 } 158 159 static void *octeon_dma_alloc_coherent(struct device *dev, size_t size, 160 dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs) 161 { 162 void *ret; 163 164 /* ignore region specifiers */ 165 gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); 166 167 #ifdef CONFIG_ZONE_DMA 168 if (dev == NULL) 169 gfp |= __GFP_DMA; 170 else if (dev->coherent_dma_mask <= DMA_BIT_MASK(24)) 171 gfp |= __GFP_DMA; 172 else 173 #endif 174 #ifdef CONFIG_ZONE_DMA32 175 if (dev->coherent_dma_mask <= DMA_BIT_MASK(32)) 176 gfp |= __GFP_DMA32; 177 else 178 #endif 179 ; 180 181 /* Don't invoke OOM killer */ 182 gfp |= __GFP_NORETRY; 183 184 ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp); 185 186 mb(); 187 188 return ret; 189 } 190 191 static void octeon_dma_free_coherent(struct device *dev, size_t size, 192 void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs) 193 { 194 swiotlb_free_coherent(dev, size, vaddr, dma_handle); 195 } 196 197 static dma_addr_t octeon_unity_phys_to_dma(struct device *dev, phys_addr_t paddr) 198 { 199 return paddr; 200 } 201 202 static phys_addr_t octeon_unity_dma_to_phys(struct device *dev, dma_addr_t daddr) 203 { 204 return daddr; 205 } 206 207 struct octeon_dma_map_ops { 208 struct dma_map_ops dma_map_ops; 209 dma_addr_t (*phys_to_dma)(struct device *dev, phys_addr_t paddr); 210 phys_addr_t (*dma_to_phys)(struct device *dev, dma_addr_t daddr); 211 }; 212 213 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) 214 { 215 struct octeon_dma_map_ops *ops = container_of(get_dma_ops(dev), 216 struct octeon_dma_map_ops, 217 dma_map_ops); 218 219 return ops->phys_to_dma(dev, paddr); 220 } 221 EXPORT_SYMBOL(phys_to_dma); 222 223 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) 224 { 225 struct octeon_dma_map_ops *ops = container_of(get_dma_ops(dev), 226 struct octeon_dma_map_ops, 227 dma_map_ops); 228 229 return ops->dma_to_phys(dev, daddr); 230 } 231 EXPORT_SYMBOL(dma_to_phys); 232 233 static struct octeon_dma_map_ops octeon_linear_dma_map_ops = { 234 .dma_map_ops = { 235 .alloc = octeon_dma_alloc_coherent, 236 .free = octeon_dma_free_coherent, 237 .map_page = octeon_dma_map_page, 238 .unmap_page = swiotlb_unmap_page, 239 .map_sg = octeon_dma_map_sg, 240 .unmap_sg = swiotlb_unmap_sg_attrs, 241 .sync_single_for_cpu = swiotlb_sync_single_for_cpu, 242 .sync_single_for_device = octeon_dma_sync_single_for_device, 243 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, 244 .sync_sg_for_device = octeon_dma_sync_sg_for_device, 245 .mapping_error = swiotlb_dma_mapping_error, 246 .dma_supported = swiotlb_dma_supported 247 }, 248 .phys_to_dma = octeon_unity_phys_to_dma, 249 .dma_to_phys = octeon_unity_dma_to_phys 250 }; 251 252 char *octeon_swiotlb; 253 254 void __init plat_swiotlb_setup(void) 255 { 256 int i; 257 phys_addr_t max_addr; 258 phys_addr_t addr_size; 259 size_t swiotlbsize; 260 unsigned long swiotlb_nslabs; 261 262 max_addr = 0; 263 addr_size = 0; 264 265 for (i = 0 ; i < boot_mem_map.nr_map; i++) { 266 struct boot_mem_map_entry *e = &boot_mem_map.map[i]; 267 if (e->type != BOOT_MEM_RAM && e->type != BOOT_MEM_INIT_RAM) 268 continue; 269 270 /* These addresses map low for PCI. */ 271 if (e->addr > 0x410000000ull && !OCTEON_IS_OCTEON2()) 272 continue; 273 274 addr_size += e->size; 275 276 if (max_addr < e->addr + e->size) 277 max_addr = e->addr + e->size; 278 279 } 280 281 swiotlbsize = PAGE_SIZE; 282 283 #ifdef CONFIG_PCI 284 /* 285 * For OCTEON_DMA_BAR_TYPE_SMALL, size the iotlb at 1/4 memory 286 * size to a maximum of 64MB 287 */ 288 if (OCTEON_IS_MODEL(OCTEON_CN31XX) 289 || OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2)) { 290 swiotlbsize = addr_size / 4; 291 if (swiotlbsize > 64 * (1<<20)) 292 swiotlbsize = 64 * (1<<20); 293 } else if (max_addr > 0xf0000000ul) { 294 /* 295 * Otherwise only allocate a big iotlb if there is 296 * memory past the BAR1 hole. 297 */ 298 swiotlbsize = 64 * (1<<20); 299 } 300 #endif 301 #ifdef CONFIG_USB_OHCI_HCD_PLATFORM 302 /* OCTEON II ohci is only 32-bit. */ 303 if (OCTEON_IS_OCTEON2() && max_addr >= 0x100000000ul) 304 swiotlbsize = 64 * (1<<20); 305 #endif 306 swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT; 307 swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE); 308 swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT; 309 310 octeon_swiotlb = alloc_bootmem_low_pages(swiotlbsize); 311 312 if (swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1) == -ENOMEM) 313 panic("Cannot allocate SWIOTLB buffer"); 314 315 mips_dma_map_ops = &octeon_linear_dma_map_ops.dma_map_ops; 316 } 317 318 #ifdef CONFIG_PCI 319 static struct octeon_dma_map_ops _octeon_pci_dma_map_ops = { 320 .dma_map_ops = { 321 .alloc = octeon_dma_alloc_coherent, 322 .free = octeon_dma_free_coherent, 323 .map_page = octeon_dma_map_page, 324 .unmap_page = swiotlb_unmap_page, 325 .map_sg = octeon_dma_map_sg, 326 .unmap_sg = swiotlb_unmap_sg_attrs, 327 .sync_single_for_cpu = swiotlb_sync_single_for_cpu, 328 .sync_single_for_device = octeon_dma_sync_single_for_device, 329 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, 330 .sync_sg_for_device = octeon_dma_sync_sg_for_device, 331 .mapping_error = swiotlb_dma_mapping_error, 332 .dma_supported = swiotlb_dma_supported 333 }, 334 }; 335 336 struct dma_map_ops *octeon_pci_dma_map_ops; 337 338 void __init octeon_pci_dma_init(void) 339 { 340 switch (octeon_dma_bar_type) { 341 case OCTEON_DMA_BAR_TYPE_PCIE2: 342 _octeon_pci_dma_map_ops.phys_to_dma = octeon_gen2_phys_to_dma; 343 _octeon_pci_dma_map_ops.dma_to_phys = octeon_gen2_dma_to_phys; 344 break; 345 case OCTEON_DMA_BAR_TYPE_PCIE: 346 _octeon_pci_dma_map_ops.phys_to_dma = octeon_gen1_phys_to_dma; 347 _octeon_pci_dma_map_ops.dma_to_phys = octeon_gen1_dma_to_phys; 348 break; 349 case OCTEON_DMA_BAR_TYPE_BIG: 350 _octeon_pci_dma_map_ops.phys_to_dma = octeon_big_phys_to_dma; 351 _octeon_pci_dma_map_ops.dma_to_phys = octeon_big_dma_to_phys; 352 break; 353 case OCTEON_DMA_BAR_TYPE_SMALL: 354 _octeon_pci_dma_map_ops.phys_to_dma = octeon_small_phys_to_dma; 355 _octeon_pci_dma_map_ops.dma_to_phys = octeon_small_dma_to_phys; 356 break; 357 default: 358 BUG(); 359 } 360 octeon_pci_dma_map_ops = &_octeon_pci_dma_map_ops.dma_map_ops; 361 } 362 #endif /* CONFIG_PCI */ 363