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 #include <linux/delay.h>
  17
  18 /*
  19  * PCIe unit register offsets.
  20  */
  21 #define PCIE_DEV_ID_OFF         0x0000
  22 #define PCIE_CMD_OFF            0x0004
  23 #define PCIE_DEV_REV_OFF        0x0008
  24 #define PCIE_BAR_LO_OFF(n)      (0x0010 + ((n) << 3))
  25 #define PCIE_BAR_HI_OFF(n)      (0x0014 + ((n) << 3))
  26 #define PCIE_HEADER_LOG_4_OFF   0x0128
  27 #define PCIE_BAR_CTRL_OFF(n)    (0x1804 + ((n - 1) * 4))
  28 #define PCIE_WIN04_CTRL_OFF(n)  (0x1820 + ((n) << 4))
  29 #define PCIE_WIN04_BASE_OFF(n)  (0x1824 + ((n) << 4))
  30 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
  31 #define PCIE_WIN5_CTRL_OFF      0x1880
  32 #define PCIE_WIN5_BASE_OFF      0x1884
  33 #define PCIE_WIN5_REMAP_OFF     0x188c
  34 #define PCIE_CONF_ADDR_OFF      0x18f8
  35 #define  PCIE_CONF_ADDR_EN              0x80000000
  36 #define  PCIE_CONF_REG(r)               ((((r) & 0xf00) << 16) | ((r) & 0xfc))
  37 #define  PCIE_CONF_BUS(b)               (((b) & 0xff) << 16)
  38 #define  PCIE_CONF_DEV(d)               (((d) & 0x1f) << 11)
  39 #define  PCIE_CONF_FUNC(f)              (((f) & 0x7) << 8)
  40 #define PCIE_CONF_DATA_OFF      0x18fc
  41 #define PCIE_MASK_OFF           0x1910
  42 #define PCIE_CTRL_OFF           0x1a00
  43 #define  PCIE_CTRL_X1_MODE              0x0001
  44 #define PCIE_STAT_OFF           0x1a04
  45 #define  PCIE_STAT_DEV_OFFS             20
  46 #define  PCIE_STAT_DEV_MASK             0x1f
  47 #define  PCIE_STAT_BUS_OFFS             8
  48 #define  PCIE_STAT_BUS_MASK             0xff
  49 #define  PCIE_STAT_LINK_DOWN            1
  50 #define PCIE_DEBUG_CTRL         0x1a60
  51 #define  PCIE_DEBUG_SOFT_RESET          (1<<20)
  52
  53
  54 u32 __init orion_pcie_dev_id(void __iomem *base)
  55 {
  56         return readl(base + PCIE_DEV_ID_OFF) >> 16;
  57 }
  58
  59 u32 __init orion_pcie_rev(void __iomem *base)
  60 {
  61         return readl(base + PCIE_DEV_REV_OFF) & 0xff;
  62 }
  63
  64 int orion_pcie_link_up(void __iomem *base)
  65 {
  66         return !(readl(base + PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
  67 }
  68
  69 int __init orion_pcie_x4_mode(void __iomem *base)
  70 {
  71         return !(readl(base + PCIE_CTRL_OFF) & PCIE_CTRL_X1_MODE);
  72 }
  73
  74 int orion_pcie_get_local_bus_nr(void __iomem *base)
  75 {
  76         u32 stat = readl(base + PCIE_STAT_OFF);
  77
  78         return (stat >> PCIE_STAT_BUS_OFFS) & PCIE_STAT_BUS_MASK;
  79 }
  80
  81 void __init orion_pcie_set_local_bus_nr(void __iomem *base, int nr)
  82 {
  83         u32 stat;
  84
  85         stat = readl(base + PCIE_STAT_OFF);
  86         stat &= ~(PCIE_STAT_BUS_MASK << PCIE_STAT_BUS_OFFS);
  87         stat |= nr << PCIE_STAT_BUS_OFFS;
  88         writel(stat, base + PCIE_STAT_OFF);
  89 }
  90
  91 void __init orion_pcie_reset(void __iomem *base)
  92 {
  93         u32 reg;
  94         int i;
  95
  96         /*
  97          * MV-S104860-U0, Rev. C:
  98          * PCI Express Unit Soft Reset
  99          * When set, generates an internal reset in the PCI Express unit.
 100          * This bit should be cleared after the link is re-established.
 101          */
 102         reg = readl(base + PCIE_DEBUG_CTRL);
 103         reg |= PCIE_DEBUG_SOFT_RESET;
 104         writel(reg, base + PCIE_DEBUG_CTRL);
 105
 106         for (i = 0; i < 20; i++) {
 107                 mdelay(10);
 108
 109                 if (orion_pcie_link_up(base))
 110                         break;
 111         }
 112
 113         reg &= ~(PCIE_DEBUG_SOFT_RESET);
 114         writel(reg, base + PCIE_DEBUG_CTRL);
 115 }
 116
 117 /*
 118  * Setup PCIE BARs and Address Decode Wins:
 119  * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
 120  * WIN[0-3] -> DRAM bank[0-3]
 121  */
 122 static void __init orion_pcie_setup_wins(void __iomem *base,
 123                                          struct mbus_dram_target_info *dram)
 124 {
 125         u32 size;
 126         int i;
 127
 128         /*
 129          * First, disable and clear BARs and windows.
 130          */
 131         for (i = 1; i <= 2; i++) {
 132                 writel(0, base + PCIE_BAR_CTRL_OFF(i));
 133                 writel(0, base + PCIE_BAR_LO_OFF(i));
 134                 writel(0, base + PCIE_BAR_HI_OFF(i));
 135         }
 136
 137         for (i = 0; i < 5; i++) {
 138                 writel(0, base + PCIE_WIN04_CTRL_OFF(i));
 139                 writel(0, base + PCIE_WIN04_BASE_OFF(i));
 140                 writel(0, base + PCIE_WIN04_REMAP_OFF(i));
 141         }
 142
 143         writel(0, base + PCIE_WIN5_CTRL_OFF);
 144         writel(0, base + PCIE_WIN5_BASE_OFF);
 145         writel(0, base + PCIE_WIN5_REMAP_OFF);
 146
 147         /*
 148          * Setup windows for DDR banks.  Count total DDR size on the fly.
 149          */
 150         size = 0;
 151         for (i = 0; i < dram->num_cs; i++) {
 152                 struct mbus_dram_window *cs = dram->cs + i;
 153
 154                 writel(cs->base & 0xffff0000, base + PCIE_WIN04_BASE_OFF(i));
 155                 writel(0, base + PCIE_WIN04_REMAP_OFF(i));
 156                 writel(((cs->size - 1) & 0xffff0000) |
 157                         (cs->mbus_attr << 8) |
 158                         (dram->mbus_dram_target_id << 4) | 1,
 159                                 base + PCIE_WIN04_CTRL_OFF(i));
 160
 161                 size += cs->size;
 162         }
 163
 164         /*
 165          * Round up 'size' to the nearest power of two.
 166          */
 167         if ((size & (size - 1)) != 0)
 168                 size = 1 << fls(size);
 169
 170         /*
 171          * Setup BAR[1] to all DRAM banks.
 172          */
 173         writel(dram->cs[0].base, base + PCIE_BAR_LO_OFF(1));
 174         writel(0, base + PCIE_BAR_HI_OFF(1));
 175         writel(((size - 1) & 0xffff0000) | 1, base + PCIE_BAR_CTRL_OFF(1));
 176 }
 177
 178 void __init orion_pcie_setup(void __iomem *base,
 179                              struct mbus_dram_target_info *dram)
 180 {
 181         u16 cmd;
 182         u32 mask;
 183
 184         /*
 185          * Point PCIe unit MBUS decode windows to DRAM space.
 186          */
 187         orion_pcie_setup_wins(base, dram);
 188
 189         /*
 190          * Master + slave enable.
 191          */
 192         cmd = readw(base + PCIE_CMD_OFF);
 193         cmd |= PCI_COMMAND_IO;
 194         cmd |= PCI_COMMAND_MEMORY;
 195         cmd |= PCI_COMMAND_MASTER;
 196         writew(cmd, base + PCIE_CMD_OFF);
 197
 198         /*
 199          * Enable interrupt lines A-D.
 200          */
 201         mask = readl(base + PCIE_MASK_OFF);
 202         mask |= 0x0f000000;
 203         writel(mask, base + PCIE_MASK_OFF);
 204 }
 205
 206 int orion_pcie_rd_conf(void __iomem *base, struct pci_bus *bus,
 207                        u32 devfn, int where, int size, u32 *val)
 208 {
 209         writel(PCIE_CONF_BUS(bus->number) |
 210                 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
 211                 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
 212                 PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN,
 213                         base + PCIE_CONF_ADDR_OFF);
 214
 215         *val = readl(base + PCIE_CONF_DATA_OFF);
 216
 217         if (size == 1)
 218                 *val = (*val >> (8 * (where & 3))) & 0xff;
 219         else if (size == 2)
 220                 *val = (*val >> (8 * (where & 3))) & 0xffff;
 221
 222         return PCIBIOS_SUCCESSFUL;
 223 }
 224
 225 int orion_pcie_rd_conf_tlp(void __iomem *base, struct pci_bus *bus,
 226                            u32 devfn, int where, int size, u32 *val)
 227 {
 228         writel(PCIE_CONF_BUS(bus->number) |
 229                 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
 230                 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
 231                 PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN,
 232                         base + PCIE_CONF_ADDR_OFF);
 233
 234         *val = readl(base + PCIE_CONF_DATA_OFF);
 235
 236         if (bus->number != orion_pcie_get_local_bus_nr(base) ||
 237             PCI_FUNC(devfn) != 0)
 238                 *val = readl(base + PCIE_HEADER_LOG_4_OFF);
 239
 240         if (size == 1)
 241                 *val = (*val >> (8 * (where & 3))) & 0xff;
 242         else if (size == 2)
 243                 *val = (*val >> (8 * (where & 3))) & 0xffff;
 244
 245         return PCIBIOS_SUCCESSFUL;
 246 }
 247
 248 int orion_pcie_rd_conf_wa(void __iomem *wa_base, struct pci_bus *bus,
 249                           u32 devfn, int where, int size, u32 *val)
 250 {
 251         *val = readl(wa_base + (PCIE_CONF_BUS(bus->number) |
 252                                 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
 253                                 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
 254                                 PCIE_CONF_REG(where)));
 255
 256         if (size == 1)
 257                 *val = (*val >> (8 * (where & 3))) & 0xff;
 258         else if (size == 2)
 259                 *val = (*val >> (8 * (where & 3))) & 0xffff;
 260
 261         return PCIBIOS_SUCCESSFUL;
 262 }
 263
 264 int orion_pcie_wr_conf(void __iomem *base, struct pci_bus *bus,
 265                        u32 devfn, int where, int size, u32 val)
 266 {
 267         int ret = PCIBIOS_SUCCESSFUL;
 268
 269         writel(PCIE_CONF_BUS(bus->number) |
 270                 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
 271                 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
 272                 PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN,
 273                         base + PCIE_CONF_ADDR_OFF);
 274
 275         if (size == 4) {
 276                 writel(val, base + PCIE_CONF_DATA_OFF);
 277         } else if (size == 2) {
 278                 writew(val, base + PCIE_CONF_DATA_OFF + (where & 3));
 279         } else if (size == 1) {
 280                 writeb(val, base + PCIE_CONF_DATA_OFF + (where & 3));
 281         } else {
 282                 ret = PCIBIOS_BAD_REGISTER_NUMBER;
 283         }
 284
 285         return ret;
 286 }