arch/arm/mach-mv78xx0/pcie.c

   1 /*
   2  * arch/arm/mach-mv78xx0/pcie.c
   3  *
   4  * PCIe functions for Marvell MV78xx0 SoCs
   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 <video/vga.h>
  14 #include <asm/irq.h>
  15 #include <asm/mach/pci.h>
  16 #include <plat/pcie.h>
  17 #include <plat/addr-map.h>
  18 #include "common.h"
  19
  20 struct pcie_port {
  21         u8                      maj;
  22         u8                      min;
  23         u8                      root_bus_nr;
  24         void __iomem            *base;
  25         spinlock_t              conf_lock;
  26         char                    io_space_name[16];
  27         char                    mem_space_name[16];
  28         struct resource         res[2];
  29 };
  30
  31 static struct pcie_port pcie_port[8];
  32 static int num_pcie_ports;
  33 static struct resource pcie_io_space;
  34 static struct resource pcie_mem_space;
  35
  36
  37 void __init mv78xx0_pcie_id(u32 *dev, u32 *rev)
  38 {
  39         *dev = orion_pcie_dev_id((void __iomem *)PCIE00_VIRT_BASE);
  40         *rev = orion_pcie_rev((void __iomem *)PCIE00_VIRT_BASE);
  41 }
  42
  43 static void __init mv78xx0_pcie_preinit(void)
  44 {
  45         int i;
  46         u32 size_each;
  47         u32 start;
  48         int win;
  49
  50         pcie_io_space.name = "PCIe I/O Space";
  51         pcie_io_space.start = MV78XX0_PCIE_IO_PHYS_BASE(0);
  52         pcie_io_space.end =
  53                 MV78XX0_PCIE_IO_PHYS_BASE(0) + MV78XX0_PCIE_IO_SIZE * 8 - 1;
  54         pcie_io_space.flags = IORESOURCE_IO;
  55         if (request_resource(&iomem_resource, &pcie_io_space))
  56                 panic("can't allocate PCIe I/O space");
  57
  58         pcie_mem_space.name = "PCIe MEM Space";
  59         pcie_mem_space.start = MV78XX0_PCIE_MEM_PHYS_BASE;
  60         pcie_mem_space.end =
  61                 MV78XX0_PCIE_MEM_PHYS_BASE + MV78XX0_PCIE_MEM_SIZE - 1;
  62         pcie_mem_space.flags = IORESOURCE_MEM;
  63         if (request_resource(&iomem_resource, &pcie_mem_space))
  64                 panic("can't allocate PCIe MEM space");
  65
  66         for (i = 0; i < num_pcie_ports; i++) {
  67                 struct pcie_port *pp = pcie_port + i;
  68
  69                 snprintf(pp->io_space_name, sizeof(pp->io_space_name),
  70                         "PCIe %d.%d I/O", pp->maj, pp->min);
  71                 pp->io_space_name[sizeof(pp->io_space_name) - 1] = 0;
  72                 pp->res[0].name = pp->io_space_name;
  73                 pp->res[0].start = MV78XX0_PCIE_IO_PHYS_BASE(i);
  74                 pp->res[0].end = pp->res[0].start + MV78XX0_PCIE_IO_SIZE - 1;
  75                 pp->res[0].flags = IORESOURCE_IO;
  76
  77                 snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
  78                         "PCIe %d.%d MEM", pp->maj, pp->min);
  79                 pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
  80                 pp->res[1].name = pp->mem_space_name;
  81                 pp->res[1].flags = IORESOURCE_MEM;
  82         }
  83
  84         switch (num_pcie_ports) {
  85         case 0:
  86                 size_each = 0;
  87                 break;
  88
  89         case 1:
  90                 size_each = 0x30000000;
  91                 break;
  92
  93         case 2 ... 3:
  94                 size_each = 0x10000000;
  95                 break;
  96
  97         case 4 ... 6:
  98                 size_each = 0x08000000;
  99                 break;
 100
 101         case 7:
 102                 size_each = 0x04000000;
 103                 break;
 104
 105         default:
 106                 panic("invalid number of PCIe ports");
 107         }
 108
 109         start = MV78XX0_PCIE_MEM_PHYS_BASE;
 110         for (i = 0; i < num_pcie_ports; i++) {
 111                 struct pcie_port *pp = pcie_port + i;
 112
 113                 pp->res[1].start = start;
 114                 pp->res[1].end = start + size_each - 1;
 115                 start += size_each;
 116         }
 117
 118         for (i = 0; i < num_pcie_ports; i++) {
 119                 struct pcie_port *pp = pcie_port + i;
 120
 121                 if (request_resource(&pcie_io_space, &pp->res[0]))
 122                         panic("can't allocate PCIe I/O sub-space");
 123
 124                 if (request_resource(&pcie_mem_space, &pp->res[1]))
 125                         panic("can't allocate PCIe MEM sub-space");
 126         }
 127
 128         win = 0;
 129         for (i = 0; i < num_pcie_ports; i++) {
 130                 struct pcie_port *pp = pcie_port + i;
 131
 132                 mv78xx0_setup_pcie_io_win(win++, pp->res[0].start,
 133                                           resource_size(&pp->res[0]),
 134                                           pp->maj, pp->min);
 135
 136                 mv78xx0_setup_pcie_mem_win(win++, pp->res[1].start,
 137                                            resource_size(&pp->res[1]),
 138                                            pp->maj, pp->min);
 139         }
 140 }
 141
 142 static int __init mv78xx0_pcie_setup(int nr, struct pci_sys_data *sys)
 143 {
 144         struct pcie_port *pp;
 145
 146         if (nr >= num_pcie_ports)
 147                 return 0;
 148
 149         pp = &pcie_port[nr];
 150         pp->root_bus_nr = sys->busnr;
 151
 152         /*
 153          * Generic PCIe unit setup.
 154          */
 155         orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
 156         orion_pcie_setup(pp->base);
 157
 158         pci_add_resource(&sys->resources, &pp->res[0]);
 159         pci_add_resource(&sys->resources, &pp->res[1]);
 160
 161         return 1;
 162 }
 163
 164 static struct pcie_port *bus_to_port(int bus)
 165 {
 166         int i;
 167
 168         for (i = num_pcie_ports - 1; i >= 0; i--) {
 169                 int rbus = pcie_port[i].root_bus_nr;
 170                 if (rbus != -1 && rbus <= bus)
 171                         break;
 172         }
 173
 174         return i >= 0 ? pcie_port + i : NULL;
 175 }
 176
 177 static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
 178 {
 179         /*
 180          * Don't go out when trying to access nonexisting devices
 181          * on the local bus.
 182          */
 183         if (bus == pp->root_bus_nr && dev > 1)
 184                 return 0;
 185
 186         return 1;
 187 }
 188
 189 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 190                         int size, u32 *val)
 191 {
 192         struct pcie_port *pp = bus_to_port(bus->number);
 193         unsigned long flags;
 194         int ret;
 195
 196         if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
 197                 *val = 0xffffffff;
 198                 return PCIBIOS_DEVICE_NOT_FOUND;
 199         }
 200
 201         spin_lock_irqsave(&pp->conf_lock, flags);
 202         ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
 203         spin_unlock_irqrestore(&pp->conf_lock, flags);
 204
 205         return ret;
 206 }
 207
 208 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 209                         int where, int size, u32 val)
 210 {
 211         struct pcie_port *pp = bus_to_port(bus->number);
 212         unsigned long flags;
 213         int ret;
 214
 215         if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
 216                 return PCIBIOS_DEVICE_NOT_FOUND;
 217
 218         spin_lock_irqsave(&pp->conf_lock, flags);
 219         ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
 220         spin_unlock_irqrestore(&pp->conf_lock, flags);
 221
 222         return ret;
 223 }
 224
 225 static struct pci_ops pcie_ops = {
 226         .read = pcie_rd_conf,
 227         .write = pcie_wr_conf,
 228 };
 229
 230 static void __devinit rc_pci_fixup(struct pci_dev *dev)
 231 {
 232         /*
 233          * Prevent enumeration of root complex.
 234          */
 235         if (dev->bus->parent == NULL && dev->devfn == 0) {
 236                 int i;
 237
 238                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 239                         dev->resource[i].start = 0;
 240                         dev->resource[i].end   = 0;
 241                         dev->resource[i].flags = 0;
 242                 }
 243         }
 244 }
 245 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
 246
 247 static struct pci_bus __init *
 248 mv78xx0_pcie_scan_bus(int nr, struct pci_sys_data *sys)
 249 {
 250         struct pci_bus *bus;
 251
 252         if (nr < num_pcie_ports) {
 253                 bus = pci_scan_root_bus(NULL, sys->busnr, &pcie_ops, sys,
 254                                         &sys->resources);
 255         } else {
 256                 bus = NULL;
 257                 BUG();
 258         }
 259
 260         return bus;
 261 }
 262
 263 static int __init mv78xx0_pcie_map_irq(const struct pci_dev *dev, u8 slot,
 264         u8 pin)
 265 {
 266         struct pcie_port *pp = bus_to_port(dev->bus->number);
 267
 268         return IRQ_MV78XX0_PCIE_00 + (pp->maj << 2) + pp->min;
 269 }
 270
 271 static struct hw_pci mv78xx0_pci __initdata = {
 272         .nr_controllers = 8,
 273         .preinit        = mv78xx0_pcie_preinit,
 274         .swizzle        = pci_std_swizzle,
 275         .setup          = mv78xx0_pcie_setup,
 276         .scan           = mv78xx0_pcie_scan_bus,
 277         .map_irq        = mv78xx0_pcie_map_irq,
 278 };
 279
 280 static void __init add_pcie_port(int maj, int min, unsigned long base)
 281 {
 282         printk(KERN_INFO "MV78xx0 PCIe port %d.%d: ", maj, min);
 283
 284         if (orion_pcie_link_up((void __iomem *)base)) {
 285                 struct pcie_port *pp = &pcie_port[num_pcie_ports++];
 286
 287                 printk("link up\n");
 288
 289                 pp->maj = maj;
 290                 pp->min = min;
 291                 pp->root_bus_nr = -1;
 292                 pp->base = (void __iomem *)base;
 293                 spin_lock_init(&pp->conf_lock);
 294                 memset(pp->res, 0, sizeof(pp->res));
 295         } else {
 296                 printk("link down, ignoring\n");
 297         }
 298 }
 299
 300 void __init mv78xx0_pcie_init(int init_port0, int init_port1)
 301 {
 302         vga_base = MV78XX0_PCIE_MEM_PHYS_BASE;
 303
 304         if (init_port0) {
 305                 add_pcie_port(0, 0, PCIE00_VIRT_BASE);
 306                 if (!orion_pcie_x4_mode((void __iomem *)PCIE00_VIRT_BASE)) {
 307                         add_pcie_port(0, 1, PCIE01_VIRT_BASE);
 308                         add_pcie_port(0, 2, PCIE02_VIRT_BASE);
 309                         add_pcie_port(0, 3, PCIE03_VIRT_BASE);
 310                 }
 311         }
 312
 313         if (init_port1) {
 314                 add_pcie_port(1, 0, PCIE10_VIRT_BASE);
 315                 if (!orion_pcie_x4_mode((void __iomem *)PCIE10_VIRT_BASE)) {
 316                         add_pcie_port(1, 1, PCIE11_VIRT_BASE);
 317                         add_pcie_port(1, 2, PCIE12_VIRT_BASE);
 318                         add_pcie_port(1, 3, PCIE13_VIRT_BASE);
 319                 }
 320         }
 321
 322         pci_common_init(&mv78xx0_pci);
 323 }