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 <mach/mv78xx0.h>
  19 #include "common.h"
  20
  21 struct pcie_port {
  22         u8                      maj;
  23         u8                      min;
  24         u8                      root_bus_nr;
  25         void __iomem            *base;
  26         spinlock_t              conf_lock;
  27         char                    mem_space_name[16];
  28         struct resource         res;
  29 };
  30
  31 static struct pcie_port pcie_port[8];
  32 static int num_pcie_ports;
  33 static struct resource pcie_io_space;
  34
  35 void __init mv78xx0_pcie_id(u32 *dev, u32 *rev)
  36 {
  37         *dev = orion_pcie_dev_id(PCIE00_VIRT_BASE);
  38         *rev = orion_pcie_rev(PCIE00_VIRT_BASE);
  39 }
  40
  41 u32 pcie_port_size[8] = {
  42         0,
  43         0x30000000,
  44         0x10000000,
  45         0x10000000,
  46         0x08000000,
  47         0x08000000,
  48         0x08000000,
  49         0x04000000,
  50 };
  51
  52 static void __init mv78xx0_pcie_preinit(void)
  53 {
  54         int i;
  55         u32 size_each;
  56         u32 start;
  57         int win = 0;
  58
  59         pcie_io_space.name = "PCIe I/O Space";
  60         pcie_io_space.start = MV78XX0_PCIE_IO_PHYS_BASE(0);
  61         pcie_io_space.end =
  62                 MV78XX0_PCIE_IO_PHYS_BASE(0) + MV78XX0_PCIE_IO_SIZE * 8 - 1;
  63         pcie_io_space.flags = IORESOURCE_MEM;
  64         if (request_resource(&iomem_resource, &pcie_io_space))
  65                 panic("can't allocate PCIe I/O space");
  66
  67         if (num_pcie_ports > 7)
  68                 panic("invalid number of PCIe ports");
  69
  70         size_each = pcie_port_size[num_pcie_ports];
  71
  72         start = MV78XX0_PCIE_MEM_PHYS_BASE;
  73         for (i = 0; i < num_pcie_ports; i++) {
  74                 struct pcie_port *pp = pcie_port + i;
  75
  76                 snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
  77                         "PCIe %d.%d MEM", pp->maj, pp->min);
  78                 pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
  79                 pp->res.name = pp->mem_space_name;
  80                 pp->res.flags = IORESOURCE_MEM;
  81                 pp->res.start = start;
  82                 pp->res.end = start + size_each - 1;
  83                 start += size_each;
  84
  85                 if (request_resource(&iomem_resource, &pp->res))
  86                         panic("can't allocate PCIe MEM sub-space");
  87
  88                 mv78xx0_setup_pcie_mem_win(win + i + 8, pp->res.start,
  89                                            resource_size(&pp->res),
  90                                            pp->maj, pp->min);
  91
  92                 mv78xx0_setup_pcie_io_win(win + i, i * SZ_64K, SZ_64K,
  93                                           pp->maj, pp->min);
  94         }
  95 }
  96
  97 static int __init mv78xx0_pcie_setup(int nr, struct pci_sys_data *sys)
  98 {
  99         struct pcie_port *pp;
 100
 101         if (nr >= num_pcie_ports)
 102                 return 0;
 103
 104         pp = &pcie_port[nr];
 105         sys->private_data = pp;
 106         pp->root_bus_nr = sys->busnr;
 107
 108         /*
 109          * Generic PCIe unit setup.
 110          */
 111         orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
 112         orion_pcie_setup(pp->base);
 113
 114         pci_ioremap_io(nr * SZ_64K, MV78XX0_PCIE_IO_PHYS_BASE(nr));
 115
 116         pci_add_resource_offset(&sys->resources, &pp->res, sys->mem_offset);
 117
 118         return 1;
 119 }
 120
 121 static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
 122 {
 123         /*
 124          * Don't go out when trying to access nonexisting devices
 125          * on the local bus.
 126          */
 127         if (bus == pp->root_bus_nr && dev > 1)
 128                 return 0;
 129
 130         return 1;
 131 }
 132
 133 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 134                         int size, u32 *val)
 135 {
 136         struct pci_sys_data *sys = bus->sysdata;
 137         struct pcie_port *pp = sys->private_data;
 138         unsigned long flags;
 139         int ret;
 140
 141         if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
 142                 *val = 0xffffffff;
 143                 return PCIBIOS_DEVICE_NOT_FOUND;
 144         }
 145
 146         spin_lock_irqsave(&pp->conf_lock, flags);
 147         ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
 148         spin_unlock_irqrestore(&pp->conf_lock, flags);
 149
 150         return ret;
 151 }
 152
 153 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 154                         int where, int size, u32 val)
 155 {
 156         struct pci_sys_data *sys = bus->sysdata;
 157         struct pcie_port *pp = sys->private_data;
 158         unsigned long flags;
 159         int ret;
 160
 161         if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
 162                 return PCIBIOS_DEVICE_NOT_FOUND;
 163
 164         spin_lock_irqsave(&pp->conf_lock, flags);
 165         ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
 166         spin_unlock_irqrestore(&pp->conf_lock, flags);
 167
 168         return ret;
 169 }
 170
 171 static struct pci_ops pcie_ops = {
 172         .read = pcie_rd_conf,
 173         .write = pcie_wr_conf,
 174 };
 175
 176 static void rc_pci_fixup(struct pci_dev *dev)
 177 {
 178         /*
 179          * Prevent enumeration of root complex.
 180          */
 181         if (dev->bus->parent == NULL && dev->devfn == 0) {
 182                 int i;
 183
 184                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 185                         dev->resource[i].start = 0;
 186                         dev->resource[i].end   = 0;
 187                         dev->resource[i].flags = 0;
 188                 }
 189         }
 190 }
 191 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
 192
 193 static struct pci_bus __init *
 194 mv78xx0_pcie_scan_bus(int nr, struct pci_sys_data *sys)
 195 {
 196         struct pci_bus *bus;
 197
 198         if (nr < num_pcie_ports) {
 199                 bus = pci_scan_root_bus(NULL, sys->busnr, &pcie_ops, sys,
 200                                         &sys->resources);
 201         } else {
 202                 bus = NULL;
 203                 BUG();
 204         }
 205
 206         return bus;
 207 }
 208
 209 static int __init mv78xx0_pcie_map_irq(const struct pci_dev *dev, u8 slot,
 210         u8 pin)
 211 {
 212         struct pci_sys_data *sys = dev->bus->sysdata;
 213         struct pcie_port *pp = sys->private_data;
 214
 215         return IRQ_MV78XX0_PCIE_00 + (pp->maj << 2) + pp->min;
 216 }
 217
 218 static struct hw_pci mv78xx0_pci __initdata = {
 219         .nr_controllers = 8,
 220         .preinit        = mv78xx0_pcie_preinit,
 221         .setup          = mv78xx0_pcie_setup,
 222         .scan           = mv78xx0_pcie_scan_bus,
 223         .map_irq        = mv78xx0_pcie_map_irq,
 224 };
 225
 226 static void __init add_pcie_port(int maj, int min, void __iomem *base)
 227 {
 228         printk(KERN_INFO "MV78xx0 PCIe port %d.%d: ", maj, min);
 229
 230         if (orion_pcie_link_up(base)) {
 231                 struct pcie_port *pp = &pcie_port[num_pcie_ports++];
 232
 233                 printk("link up\n");
 234
 235                 pp->maj = maj;
 236                 pp->min = min;
 237                 pp->root_bus_nr = -1;
 238                 pp->base = base;
 239                 spin_lock_init(&pp->conf_lock);
 240                 memset(&pp->res, 0, sizeof(pp->res));
 241         } else {
 242                 printk("link down, ignoring\n");
 243         }
 244 }
 245
 246 void __init mv78xx0_pcie_init(int init_port0, int init_port1)
 247 {
 248         vga_base = MV78XX0_PCIE_MEM_PHYS_BASE;
 249
 250         if (init_port0) {
 251                 add_pcie_port(0, 0, PCIE00_VIRT_BASE);
 252                 if (!orion_pcie_x4_mode(PCIE00_VIRT_BASE)) {
 253                         add_pcie_port(0, 1, PCIE01_VIRT_BASE);
 254                         add_pcie_port(0, 2, PCIE02_VIRT_BASE);
 255                         add_pcie_port(0, 3, PCIE03_VIRT_BASE);
 256                 }
 257         }
 258
 259         if (init_port1) {
 260                 add_pcie_port(1, 0, PCIE10_VIRT_BASE);
 261                 if (!orion_pcie_x4_mode((void __iomem *)PCIE10_VIRT_BASE)) {
 262                         add_pcie_port(1, 1, PCIE11_VIRT_BASE);
 263                         add_pcie_port(1, 2, PCIE12_VIRT_BASE);
 264                         add_pcie_port(1, 3, PCIE13_VIRT_BASE);
 265                 }
 266         }
 267
 268         pci_common_init(&mv78xx0_pci);
 269 }