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_big_phys_to_dma(struct device *dev, phys_addr_t paddr)
  65 {
  66         if (paddr >= 0x410000000ull && paddr < 0x420000000ull)
  67                 paddr -= 0x400000000ull;
  68
  69         /* Anything in the BAR1 hole or above goes via BAR2 */
  70         if (paddr >= 0xf0000000ull)
  71                 paddr = OCTEON_BAR2_PCI_ADDRESS + paddr;
  72
  73         return paddr;
  74 }
  75
  76 static phys_addr_t octeon_big_dma_to_phys(struct device *dev, dma_addr_t daddr)
  77 {
  78         if (daddr >= OCTEON_BAR2_PCI_ADDRESS)
  79                 daddr -= OCTEON_BAR2_PCI_ADDRESS;
  80
  81         if (daddr >= 0x10000000ull && daddr < 0x20000000ull)
  82                 daddr += 0x400000000ull;
  83         return daddr;
  84 }
  85
  86 static dma_addr_t octeon_small_phys_to_dma(struct device *dev,
  87                                            phys_addr_t paddr)
  88 {
  89         if (paddr >= 0x410000000ull && paddr < 0x420000000ull)
  90                 paddr -= 0x400000000ull;
  91
  92         /* Anything not in the BAR1 range goes via BAR2 */
  93         if (paddr >= octeon_bar1_pci_phys && paddr < octeon_bar1_pci_phys + 0x8000000ull)
  94                 paddr = paddr - octeon_bar1_pci_phys;
  95         else
  96                 paddr = OCTEON_BAR2_PCI_ADDRESS + paddr;
  97
  98         return paddr;
  99 }
 100
 101 static phys_addr_t octeon_small_dma_to_phys(struct device *dev,
 102                                             dma_addr_t daddr)
 103 {
 104         if (daddr >= OCTEON_BAR2_PCI_ADDRESS)
 105                 daddr -= OCTEON_BAR2_PCI_ADDRESS;
 106         else
 107                 daddr += octeon_bar1_pci_phys;
 108
 109         if (daddr >= 0x10000000ull && daddr < 0x20000000ull)
 110                 daddr += 0x400000000ull;
 111         return daddr;
 112 }
 113
 114 #endif /* CONFIG_PCI */
 115
 116 static dma_addr_t octeon_dma_map_page(struct device *dev, struct page *page,
 117         unsigned long offset, size_t size, enum dma_data_direction direction,
 118         struct dma_attrs *attrs)
 119 {
 120         dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
 121                                             direction, attrs);
 122         mb();
 123
 124         return daddr;
 125 }
 126
 127 static int octeon_dma_map_sg(struct device *dev, struct scatterlist *sg,
 128         int nents, enum dma_data_direction direction, struct dma_attrs *attrs)
 129 {
 130         int r = swiotlb_map_sg_attrs(dev, sg, nents, direction, attrs);
 131         mb();
 132         return r;
 133 }
 134
 135 static void octeon_dma_sync_single_for_device(struct device *dev,
 136         dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
 137 {
 138         swiotlb_sync_single_for_device(dev, dma_handle, size, direction);
 139         mb();
 140 }
 141
 142 static void octeon_dma_sync_sg_for_device(struct device *dev,
 143         struct scatterlist *sg, int nelems, enum dma_data_direction direction)
 144 {
 145         swiotlb_sync_sg_for_device(dev, sg, nelems, direction);
 146         mb();
 147 }
 148
 149 static void *octeon_dma_alloc_coherent(struct device *dev, size_t size,
 150         dma_addr_t *dma_handle, gfp_t gfp)
 151 {
 152         void *ret;
 153
 154         if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
 155                 return ret;
 156
 157         /* ignore region specifiers */
 158         gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
 159
 160 #ifdef CONFIG_ZONE_DMA
 161         if (dev == NULL)
 162                 gfp |= __GFP_DMA;
 163         else if (dev->coherent_dma_mask <= DMA_BIT_MASK(24))
 164                 gfp |= __GFP_DMA;
 165         else
 166 #endif
 167 #ifdef CONFIG_ZONE_DMA32
 168              if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))
 169                 gfp |= __GFP_DMA32;
 170         else
 171 #endif
 172                 ;
 173
 174         /* Don't invoke OOM killer */
 175         gfp |= __GFP_NORETRY;
 176
 177         ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
 178
 179         mb();
 180
 181         return ret;
 182 }
 183
 184 static void octeon_dma_free_coherent(struct device *dev, size_t size,
 185         void *vaddr, dma_addr_t dma_handle)
 186 {
 187         int order = get_order(size);
 188
 189         if (dma_release_from_coherent(dev, order, vaddr))
 190                 return;
 191
 192         swiotlb_free_coherent(dev, size, vaddr, dma_handle);
 193 }
 194
 195 static dma_addr_t octeon_unity_phys_to_dma(struct device *dev, phys_addr_t paddr)
 196 {
 197         return paddr;
 198 }
 199
 200 static phys_addr_t octeon_unity_dma_to_phys(struct device *dev, dma_addr_t daddr)
 201 {
 202         return daddr;
 203 }
 204
 205 struct octeon_dma_map_ops {
 206         struct dma_map_ops dma_map_ops;
 207         dma_addr_t (*phys_to_dma)(struct device *dev, phys_addr_t paddr);
 208         phys_addr_t (*dma_to_phys)(struct device *dev, dma_addr_t daddr);
 209 };
 210
 211 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 212 {
 213         struct octeon_dma_map_ops *ops = container_of(get_dma_ops(dev),
 214                                                       struct octeon_dma_map_ops,
 215                                                       dma_map_ops);
 216
 217         return ops->phys_to_dma(dev, paddr);
 218 }
 219 EXPORT_SYMBOL(phys_to_dma);
 220
 221 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 222 {
 223         struct octeon_dma_map_ops *ops = container_of(get_dma_ops(dev),
 224                                                       struct octeon_dma_map_ops,
 225                                                       dma_map_ops);
 226
 227         return ops->dma_to_phys(dev, daddr);
 228 }
 229 EXPORT_SYMBOL(dma_to_phys);
 230
 231 static struct octeon_dma_map_ops octeon_linear_dma_map_ops = {
 232         .dma_map_ops = {
 233                 .alloc_coherent = octeon_dma_alloc_coherent,
 234                 .free_coherent = octeon_dma_free_coherent,
 235                 .map_page = octeon_dma_map_page,
 236                 .unmap_page = swiotlb_unmap_page,
 237                 .map_sg = octeon_dma_map_sg,
 238                 .unmap_sg = swiotlb_unmap_sg_attrs,
 239                 .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
 240                 .sync_single_for_device = octeon_dma_sync_single_for_device,
 241                 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
 242                 .sync_sg_for_device = octeon_dma_sync_sg_for_device,
 243                 .mapping_error = swiotlb_dma_mapping_error,
 244                 .dma_supported = swiotlb_dma_supported
 245         },
 246         .phys_to_dma = octeon_unity_phys_to_dma,
 247         .dma_to_phys = octeon_unity_dma_to_phys
 248 };
 249
 250 char *octeon_swiotlb;
 251
 252 void __init plat_swiotlb_setup(void)
 253 {
 254         int i;
 255         phys_t max_addr;
 256         phys_t addr_size;
 257         size_t swiotlbsize;
 258         unsigned long swiotlb_nslabs;
 259
 260         max_addr = 0;
 261         addr_size = 0;
 262
 263         for (i = 0 ; i < boot_mem_map.nr_map; i++) {
 264                 struct boot_mem_map_entry *e = &boot_mem_map.map[i];
 265                 if (e->type != BOOT_MEM_RAM)
 266                         continue;
 267
 268                 /* These addresses map low for PCI. */
 269                 if (e->addr > 0x410000000ull)
 270                         continue;
 271
 272                 addr_size += e->size;
 273
 274                 if (max_addr < e->addr + e->size)
 275                         max_addr = e->addr + e->size;
 276
 277         }
 278
 279         swiotlbsize = PAGE_SIZE;
 280
 281 #ifdef CONFIG_PCI
 282         /*
 283          * For OCTEON_DMA_BAR_TYPE_SMALL, size the iotlb at 1/4 memory
 284          * size to a maximum of 64MB
 285          */
 286         if (OCTEON_IS_MODEL(OCTEON_CN31XX)
 287             || OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2)) {
 288                 swiotlbsize = addr_size / 4;
 289                 if (swiotlbsize > 64 * (1<<20))
 290                         swiotlbsize = 64 * (1<<20);
 291         } else if (max_addr > 0xf0000000ul) {
 292                 /*
 293                  * Otherwise only allocate a big iotlb if there is
 294                  * memory past the BAR1 hole.
 295                  */
 296                 swiotlbsize = 64 * (1<<20);
 297         }
 298 #endif
 299         swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
 300         swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
 301         swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
 302
 303         octeon_swiotlb = alloc_bootmem_low_pages(swiotlbsize);
 304
 305         swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1);
 306
 307         mips_dma_map_ops = &octeon_linear_dma_map_ops.dma_map_ops;
 308 }
 309
 310 #ifdef CONFIG_PCI
 311 static struct octeon_dma_map_ops _octeon_pci_dma_map_ops = {
 312         .dma_map_ops = {
 313                 .alloc_coherent = octeon_dma_alloc_coherent,
 314                 .free_coherent = octeon_dma_free_coherent,
 315                 .map_page = octeon_dma_map_page,
 316                 .unmap_page = swiotlb_unmap_page,
 317                 .map_sg = octeon_dma_map_sg,
 318                 .unmap_sg = swiotlb_unmap_sg_attrs,
 319                 .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
 320                 .sync_single_for_device = octeon_dma_sync_single_for_device,
 321                 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
 322                 .sync_sg_for_device = octeon_dma_sync_sg_for_device,
 323                 .mapping_error = swiotlb_dma_mapping_error,
 324                 .dma_supported = swiotlb_dma_supported
 325         },
 326 };
 327
 328 struct dma_map_ops *octeon_pci_dma_map_ops;
 329
 330 void __init octeon_pci_dma_init(void)
 331 {
 332         switch (octeon_dma_bar_type) {
 333         case OCTEON_DMA_BAR_TYPE_PCIE:
 334                 _octeon_pci_dma_map_ops.phys_to_dma = octeon_gen1_phys_to_dma;
 335                 _octeon_pci_dma_map_ops.dma_to_phys = octeon_gen1_dma_to_phys;
 336                 break;
 337         case OCTEON_DMA_BAR_TYPE_BIG:
 338                 _octeon_pci_dma_map_ops.phys_to_dma = octeon_big_phys_to_dma;
 339                 _octeon_pci_dma_map_ops.dma_to_phys = octeon_big_dma_to_phys;
 340                 break;
 341         case OCTEON_DMA_BAR_TYPE_SMALL:
 342                 _octeon_pci_dma_map_ops.phys_to_dma = octeon_small_phys_to_dma;
 343                 _octeon_pci_dma_map_ops.dma_to_phys = octeon_small_dma_to_phys;
 344                 break;
 345         default:
 346                 BUG();
 347         }
 348         octeon_pci_dma_map_ops = &_octeon_pci_dma_map_ops.dma_map_ops;
 349 }
 350 #endif /* CONFIG_PCI */