arch/mips/cavium-octeon/dma-octeon.c

   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 */