arch/arm/plat-orion/pcie.c

   1 /*
   2  * arch/arm/plat-orion/pcie.c
   3  *
   4  * Marvell Orion SoC PCIe handling.
   5  *
   6  * This file is licensed under the terms of the GNU General Public
   7  * License version 2.  This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/pci.h>
  13 #include <linux/mbus.h>
  14 #include <asm/mach/pci.h>
  15 #include <plat/pcie.h>
  16
  17 /*
  18  * PCIe unit register offsets.
  19  */
  20 #define PCIE_DEV_ID_OFF         0x0000
  21 #define PCIE_CMD_OFF            0x0004
  22 #define PCIE_DEV_REV_OFF        0x0008
  23 #define PCIE_BAR_LO_OFF(n)      (0x0010 + ((n) << 3))
  24 #define PCIE_BAR_HI_OFF(n)      (0x0014 + ((n) << 3))
  25 #define PCIE_HEADER_LOG_4_OFF   0x0128
  26 #define PCIE_BAR_CTRL_OFF(n)    (0x1804 + ((n - 1) * 4))
  27 #define PCIE_WIN04_CTRL_OFF(n)  (0x1820 + ((n) << 4))
  28 #define PCIE_WIN04_BASE_OFF(n)  (0x1824 + ((n) << 4))
  29 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
  30 #define PCIE_WIN5_CTRL_OFF      0x1880
  31 #define PCIE_WIN5_BASE_OFF      0x1884
  32 #define PCIE_WIN5_REMAP_OFF     0x188c
  33 #define PCIE_CONF_ADDR_OFF      0x18f8
  34 #define  PCIE_CONF_ADDR_EN              0x80000000
  35 #define  PCIE_CONF_REG(r)               ((((r) & 0xf00) << 16) | ((r) & 0xfc))
  36 #define  PCIE_CONF_BUS(b)               (((b) & 0xff) << 16)
  37 #define  PCIE_CONF_DEV(d)               (((d) & 0x1f) << 11)
  38 #define  PCIE_CONF_FUNC(f)              (((f) & 0x7) << 8)
  39 #define PCIE_CONF_DATA_OFF      0x18fc
  40 #define PCIE_MASK_OFF           0x1910
  41 #define PCIE_CTRL_OFF           0x1a00
  42 #define  PCIE_CTRL_X1_MODE              0x0001
  43 #define PCIE_STAT_OFF           0x1a04
  44 #define  PCIE_STAT_DEV_OFFS             20
  45 #define  PCIE_STAT_DEV_MASK             0x1f
  46 #define  PCIE_STAT_BUS_OFFS             8
  47 #define  PCIE_STAT_BUS_MASK             0xff
  48 #define  PCIE_STAT_LINK_DOWN            1
  49
  50
  51 u32 __init orion_pcie_dev_id(void __iomem *base)
  52 {
  53         return readl(base + PCIE_DEV_ID_OFF) >> 16;
  54 }
  55
  56 u32 __init orion_pcie_rev(void __iomem *base)
  57 {
  58         return readl(base + PCIE_DEV_REV_OFF) & 0xff;
  59 }
  60
  61 int orion_pcie_link_up(void __iomem *base)
  62 {
  63         return !(readl(base + PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
  64 }
  65
  66 int __init orion_pcie_x4_mode(void __iomem *base)
  67 {
  68         return !(readl(base + PCIE_CTRL_OFF) & PCIE_CTRL_X1_MODE);
  69 }
  70
  71 int orion_pcie_get_local_bus_nr(void __iomem *base)
  72 {
  73         u32 stat = readl(base + PCIE_STAT_OFF);
  74
  75         return (stat >> PCIE_STAT_BUS_OFFS) & PCIE_STAT_BUS_MASK;
  76 }
  77
  78 void __init orion_pcie_set_local_bus_nr(void __iomem *base, int nr)
  79 {
  80         u32 stat;
  81
  82         stat = readl(base + PCIE_STAT_OFF);
  83         stat &= ~(PCIE_STAT_BUS_MASK << PCIE_STAT_BUS_OFFS);
  84         stat |= nr << PCIE_STAT_BUS_OFFS;
  85         writel(stat, base + PCIE_STAT_OFF);
  86 }
  87
  88 /*
  89  * Setup PCIE BARs and Address Decode Wins:
  90  * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
  91  * WIN[0-3] -> DRAM bank[0-3]
  92  */
  93 static void __init orion_pcie_setup_wins(void __iomem *base,
  94                                          struct mbus_dram_target_info *dram)
  95 {
  96         u32 size;
  97         int i;
  98
  99         /*
 100          * First, disable and clear BARs and windows.
 101          */
 102         for (i = 1; i <= 2; i++) {
 103                 writel(0, base + PCIE_BAR_CTRL_OFF(i));
 104                 writel(0, base + PCIE_BAR_LO_OFF(i));
 105                 writel(0, base + PCIE_BAR_HI_OFF(i));
 106         }
 107
 108         for (i = 0; i < 5; i++) {
 109                 writel(0, base + PCIE_WIN04_CTRL_OFF(i));
 110                 writel(0, base + PCIE_WIN04_BASE_OFF(i));
 111                 writel(0, base + PCIE_WIN04_REMAP_OFF(i));
 112         }
 113
 114         writel(0, base + PCIE_WIN5_CTRL_OFF);
 115         writel(0, base + PCIE_WIN5_BASE_OFF);
 116         writel(0, base + PCIE_WIN5_REMAP_OFF);
 117
 118         /*
 119          * Setup windows for DDR banks.  Count total DDR size on the fly.
 120          */
 121         size = 0;
 122         for (i = 0; i < dram->num_cs; i++) {
 123                 struct mbus_dram_window *cs = dram->cs + i;
 124
 125                 writel(cs->base & 0xffff0000, base + PCIE_WIN04_BASE_OFF(i));
 126                 writel(0, base + PCIE_WIN04_REMAP_OFF(i));
 127                 writel(((cs->size - 1) & 0xffff0000) |
 128                         (cs->mbus_attr << 8) |
 129                         (dram->mbus_dram_target_id << 4) | 1,
 130                                 base + PCIE_WIN04_CTRL_OFF(i));
 131
 132                 size += cs->size;
 133         }
 134
 135         /*
 136          * Round up 'size' to the nearest power of two.
 137          */
 138         if ((size & (size - 1)) != 0)
 139                 size = 1 << fls(size);
 140
 141         /*
 142          * Setup BAR[1] to all DRAM banks.
 143          */
 144         writel(dram->cs[0].base, base + PCIE_BAR_LO_OFF(1));
 145         writel(0, base + PCIE_BAR_HI_OFF(1));
 146         writel(((size - 1) & 0xffff0000) | 1, base + PCIE_BAR_CTRL_OFF(1));
 147 }
 148
 149 void __init orion_pcie_setup(void __iomem *base,
 150                              struct mbus_dram_target_info *dram)
 151 {
 152         u16 cmd;
 153         u32 mask;
 154
 155         /*
 156          * Point PCIe unit MBUS decode windows to DRAM space.
 157          */
 158         orion_pcie_setup_wins(base, dram);
 159
 160         /*
 161          * Master + slave enable.
 162          */
 163         cmd = readw(base + PCIE_CMD_OFF);
 164         cmd |= PCI_COMMAND_IO;
 165         cmd |= PCI_COMMAND_MEMORY;
 166         cmd |= PCI_COMMAND_MASTER;
 167         writew(cmd, base + PCIE_CMD_OFF);
 168
 169         /*
 170          * Enable interrupt lines A-D.
 171          */
 172         mask = readl(base + PCIE_MASK_OFF);
 173         mask |= 0x0f000000;
 174         writel(mask, base + PCIE_MASK_OFF);
 175 }
 176
 177 int orion_pcie_rd_conf(void __iomem *base, struct pci_bus *bus,
 178                        u32 devfn, int where, int size, u32 *val)
 179 {
 180         writel(PCIE_CONF_BUS(bus->number) |
 181                 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
 182                 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
 183                 PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN,
 184                         base + PCIE_CONF_ADDR_OFF);
 185
 186         *val = readl(base + PCIE_CONF_DATA_OFF);
 187
 188         if (size == 1)
 189                 *val = (*val >> (8 * (where & 3))) & 0xff;
 190         else if (size == 2)
 191                 *val = (*val >> (8 * (where & 3))) & 0xffff;
 192
 193         return PCIBIOS_SUCCESSFUL;
 194 }
 195
 196 int orion_pcie_rd_conf_tlp(void __iomem *base, struct pci_bus *bus,
 197                            u32 devfn, int where, int size, u32 *val)
 198 {
 199         writel(PCIE_CONF_BUS(bus->number) |
 200                 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
 201                 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
 202                 PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN,
 203                         base + PCIE_CONF_ADDR_OFF);
 204
 205         *val = readl(base + PCIE_CONF_DATA_OFF);
 206
 207         if (bus->number != orion_pcie_get_local_bus_nr(base) ||
 208             PCI_FUNC(devfn) != 0)
 209                 *val = readl(base + PCIE_HEADER_LOG_4_OFF);
 210
 211         if (size == 1)
 212                 *val = (*val >> (8 * (where & 3))) & 0xff;
 213         else if (size == 2)
 214                 *val = (*val >> (8 * (where & 3))) & 0xffff;
 215
 216         return PCIBIOS_SUCCESSFUL;
 217 }
 218
 219 int orion_pcie_rd_conf_wa(void __iomem *wa_base, struct pci_bus *bus,
 220                           u32 devfn, int where, int size, u32 *val)
 221 {
 222         *val = readl(wa_base + (PCIE_CONF_BUS(bus->number) |
 223                                 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
 224                                 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
 225                                 PCIE_CONF_REG(where)));
 226
 227         if (size == 1)
 228                 *val = (*val >> (8 * (where & 3))) & 0xff;
 229         else if (size == 2)
 230                 *val = (*val >> (8 * (where & 3))) & 0xffff;
 231
 232         return PCIBIOS_SUCCESSFUL;
 233 }
 234
 235 int orion_pcie_wr_conf(void __iomem *base, struct pci_bus *bus,
 236                        u32 devfn, int where, int size, u32 val)
 237 {
 238         int ret = PCIBIOS_SUCCESSFUL;
 239
 240         writel(PCIE_CONF_BUS(bus->number) |
 241                 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
 242                 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
 243                 PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN,
 244                         base + PCIE_CONF_ADDR_OFF);
 245
 246         if (size == 4) {
 247                 writel(val, base + PCIE_CONF_DATA_OFF);
 248         } else if (size == 2) {
 249                 writew(val, base + PCIE_CONF_DATA_OFF + (where & 3));
 250         } else if (size == 1) {
 251                 writeb(val, base + PCIE_CONF_DATA_OFF + (where & 3));
 252         } else {
 253                 ret = PCIBIOS_BAD_REGISTER_NUMBER;
 254         }
 255
 256         return ret;
 257 }