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-direct.h>
  14 #include <linux/memblock.h>
  15 #include <linux/swiotlb.h>
  16 #include <linux/types.h>
  17 #include <linux/init.h>
  18 #include <linux/mm.h>
  19
  20 #include <asm/bootinfo.h>
  21
  22 #include <asm/octeon/octeon.h>
  23
  24 #ifdef CONFIG_PCI
  25 #include <linux/pci.h>
  26 #include <asm/octeon/pci-octeon.h>
  27 #include <asm/octeon/cvmx-npi-defs.h>
  28 #include <asm/octeon/cvmx-pci-defs.h>
  29
  30 struct octeon_dma_map_ops {
  31         dma_addr_t (*phys_to_dma)(struct device *dev, phys_addr_t paddr);
  32         phys_addr_t (*dma_to_phys)(struct device *dev, dma_addr_t daddr);
  33 };
  34
  35 static dma_addr_t octeon_hole_phys_to_dma(phys_addr_t paddr)
  36 {
  37         if (paddr >= CVMX_PCIE_BAR1_PHYS_BASE && paddr < (CVMX_PCIE_BAR1_PHYS_BASE + CVMX_PCIE_BAR1_PHYS_SIZE))
  38                 return paddr - CVMX_PCIE_BAR1_PHYS_BASE + CVMX_PCIE_BAR1_RC_BASE;
  39         else
  40                 return paddr;
  41 }
  42
  43 static phys_addr_t octeon_hole_dma_to_phys(dma_addr_t daddr)
  44 {
  45         if (daddr >= CVMX_PCIE_BAR1_RC_BASE)
  46                 return daddr + CVMX_PCIE_BAR1_PHYS_BASE - CVMX_PCIE_BAR1_RC_BASE;
  47         else
  48                 return daddr;
  49 }
  50
  51 static dma_addr_t octeon_gen1_phys_to_dma(struct device *dev, phys_addr_t paddr)
  52 {
  53         if (paddr >= 0x410000000ull && paddr < 0x420000000ull)
  54                 paddr -= 0x400000000ull;
  55         return octeon_hole_phys_to_dma(paddr);
  56 }
  57
  58 static phys_addr_t octeon_gen1_dma_to_phys(struct device *dev, dma_addr_t daddr)
  59 {
  60         daddr = octeon_hole_dma_to_phys(daddr);
  61
  62         if (daddr >= 0x10000000ull && daddr < 0x20000000ull)
  63                 daddr += 0x400000000ull;
  64
  65         return daddr;
  66 }
  67
  68 static const struct octeon_dma_map_ops octeon_gen1_ops = {
  69         .phys_to_dma    = octeon_gen1_phys_to_dma,
  70         .dma_to_phys    = octeon_gen1_dma_to_phys,
  71 };
  72
  73 static dma_addr_t octeon_gen2_phys_to_dma(struct device *dev, phys_addr_t paddr)
  74 {
  75         return octeon_hole_phys_to_dma(paddr);
  76 }
  77
  78 static phys_addr_t octeon_gen2_dma_to_phys(struct device *dev, dma_addr_t daddr)
  79 {
  80         return octeon_hole_dma_to_phys(daddr);
  81 }
  82
  83 static const struct octeon_dma_map_ops octeon_gen2_ops = {
  84         .phys_to_dma    = octeon_gen2_phys_to_dma,
  85         .dma_to_phys    = octeon_gen2_dma_to_phys,
  86 };
  87
  88 static dma_addr_t octeon_big_phys_to_dma(struct device *dev, phys_addr_t paddr)
  89 {
  90         if (paddr >= 0x410000000ull && paddr < 0x420000000ull)
  91                 paddr -= 0x400000000ull;
  92
  93         /* Anything in the BAR1 hole or above goes via BAR2 */
  94         if (paddr >= 0xf0000000ull)
  95                 paddr = OCTEON_BAR2_PCI_ADDRESS + paddr;
  96
  97         return paddr;
  98 }
  99
 100 static phys_addr_t octeon_big_dma_to_phys(struct device *dev, dma_addr_t daddr)
 101 {
 102         if (daddr >= OCTEON_BAR2_PCI_ADDRESS)
 103                 daddr -= OCTEON_BAR2_PCI_ADDRESS;
 104
 105         if (daddr >= 0x10000000ull && daddr < 0x20000000ull)
 106                 daddr += 0x400000000ull;
 107         return daddr;
 108 }
 109
 110 static const struct octeon_dma_map_ops octeon_big_ops = {
 111         .phys_to_dma    = octeon_big_phys_to_dma,
 112         .dma_to_phys    = octeon_big_dma_to_phys,
 113 };
 114
 115 static dma_addr_t octeon_small_phys_to_dma(struct device *dev,
 116                                            phys_addr_t paddr)
 117 {
 118         if (paddr >= 0x410000000ull && paddr < 0x420000000ull)
 119                 paddr -= 0x400000000ull;
 120
 121         /* Anything not in the BAR1 range goes via BAR2 */
 122         if (paddr >= octeon_bar1_pci_phys && paddr < octeon_bar1_pci_phys + 0x8000000ull)
 123                 paddr = paddr - octeon_bar1_pci_phys;
 124         else
 125                 paddr = OCTEON_BAR2_PCI_ADDRESS + paddr;
 126
 127         return paddr;
 128 }
 129
 130 static phys_addr_t octeon_small_dma_to_phys(struct device *dev,
 131                                             dma_addr_t daddr)
 132 {
 133         if (daddr >= OCTEON_BAR2_PCI_ADDRESS)
 134                 daddr -= OCTEON_BAR2_PCI_ADDRESS;
 135         else
 136                 daddr += octeon_bar1_pci_phys;
 137
 138         if (daddr >= 0x10000000ull && daddr < 0x20000000ull)
 139                 daddr += 0x400000000ull;
 140         return daddr;
 141 }
 142
 143 static const struct octeon_dma_map_ops octeon_small_ops = {
 144         .phys_to_dma    = octeon_small_phys_to_dma,
 145         .dma_to_phys    = octeon_small_dma_to_phys,
 146 };
 147
 148 static const struct octeon_dma_map_ops *octeon_pci_dma_ops;
 149
 150 void __init octeon_pci_dma_init(void)
 151 {
 152         switch (octeon_dma_bar_type) {
 153         case OCTEON_DMA_BAR_TYPE_PCIE:
 154                 octeon_pci_dma_ops = &octeon_gen1_ops;
 155                 break;
 156         case OCTEON_DMA_BAR_TYPE_PCIE2:
 157                 octeon_pci_dma_ops = &octeon_gen2_ops;
 158                 break;
 159         case OCTEON_DMA_BAR_TYPE_BIG:
 160                 octeon_pci_dma_ops = &octeon_big_ops;
 161                 break;
 162         case OCTEON_DMA_BAR_TYPE_SMALL:
 163                 octeon_pci_dma_ops = &octeon_small_ops;
 164                 break;
 165         default:
 166                 BUG();
 167         }
 168 }
 169 #endif /* CONFIG_PCI */
 170
 171 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 172 {
 173 #ifdef CONFIG_PCI
 174         if (dev && dev_is_pci(dev))
 175                 return octeon_pci_dma_ops->phys_to_dma(dev, paddr);
 176 #endif
 177         return paddr;
 178 }
 179
 180 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 181 {
 182 #ifdef CONFIG_PCI
 183         if (dev && dev_is_pci(dev))
 184                 return octeon_pci_dma_ops->dma_to_phys(dev, daddr);
 185 #endif
 186         return daddr;
 187 }
 188
 189 char *octeon_swiotlb;
 190
 191 void __init plat_swiotlb_setup(void)
 192 {
 193         phys_addr_t start, end;
 194         phys_addr_t max_addr;
 195         phys_addr_t addr_size;
 196         size_t swiotlbsize;
 197         unsigned long swiotlb_nslabs;
 198         u64 i;
 199
 200         max_addr = 0;
 201         addr_size = 0;
 202
 203         for_each_mem_range(i, &start, &end) {
 204                 /* These addresses map low for PCI. */
 205                 if (start > 0x410000000ull && !OCTEON_IS_OCTEON2())
 206                         continue;
 207
 208                 addr_size += (end - start);
 209
 210                 if (max_addr < end)
 211                         max_addr = end;
 212         }
 213
 214         swiotlbsize = PAGE_SIZE;
 215
 216 #ifdef CONFIG_PCI
 217         /*
 218          * For OCTEON_DMA_BAR_TYPE_SMALL, size the iotlb at 1/4 memory
 219          * size to a maximum of 64MB
 220          */
 221         if (OCTEON_IS_MODEL(OCTEON_CN31XX)
 222             || OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2)) {
 223                 swiotlbsize = addr_size / 4;
 224                 if (swiotlbsize > 64 * (1<<20))
 225                         swiotlbsize = 64 * (1<<20);
 226         } else if (max_addr > 0xf0000000ul) {
 227                 /*
 228                  * Otherwise only allocate a big iotlb if there is
 229                  * memory past the BAR1 hole.
 230                  */
 231                 swiotlbsize = 64 * (1<<20);
 232         }
 233 #endif
 234 #ifdef CONFIG_USB_OHCI_HCD_PLATFORM
 235         /* OCTEON II ohci is only 32-bit. */
 236         if (OCTEON_IS_OCTEON2() && max_addr >= 0x100000000ul)
 237                 swiotlbsize = 64 * (1<<20);
 238 #endif
 239         swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
 240         swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
 241         swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
 242
 243         octeon_swiotlb = memblock_alloc_low(swiotlbsize, PAGE_SIZE);
 244         if (!octeon_swiotlb)
 245                 panic("%s: Failed to allocate %zu bytes align=%lx\n",
 246                       __func__, swiotlbsize, PAGE_SIZE);
 247
 248         if (swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1) == -ENOMEM)
 249                 panic("Cannot allocate SWIOTLB buffer");
 250 }