linux/arch/arm/mach-mv78xx0/pcie.c
<<
>>
Prefs
   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 <linux/mbus.h>
  14#include <video/vga.h>
  15#include <asm/irq.h>
  16#include <asm/mach/pci.h>
  17#include <plat/pcie.h>
  18#include "mv78xx0.h"
  19#include "common.h"
  20
  21#define MV78XX0_MBUS_PCIE_MEM_TARGET(port, lane) ((port) ? 8 : 4)
  22#define MV78XX0_MBUS_PCIE_MEM_ATTR(port, lane)   (0xf8 & ~(0x10 << (lane)))
  23#define MV78XX0_MBUS_PCIE_IO_TARGET(port, lane)  ((port) ? 8 : 4)
  24#define MV78XX0_MBUS_PCIE_IO_ATTR(port, lane)    (0xf0 & ~(0x10 << (lane)))
  25
  26struct pcie_port {
  27        u8                      maj;
  28        u8                      min;
  29        u8                      root_bus_nr;
  30        void __iomem            *base;
  31        spinlock_t              conf_lock;
  32        char                    mem_space_name[20];
  33        struct resource         res;
  34};
  35
  36static struct pcie_port pcie_port[8];
  37static int num_pcie_ports;
  38static struct resource pcie_io_space;
  39
  40void __init mv78xx0_pcie_id(u32 *dev, u32 *rev)
  41{
  42        *dev = orion_pcie_dev_id(PCIE00_VIRT_BASE);
  43        *rev = orion_pcie_rev(PCIE00_VIRT_BASE);
  44}
  45
  46u32 pcie_port_size[8] = {
  47        0,
  48        0x30000000,
  49        0x10000000,
  50        0x10000000,
  51        0x08000000,
  52        0x08000000,
  53        0x08000000,
  54        0x04000000,
  55};
  56
  57static void __init mv78xx0_pcie_preinit(void)
  58{
  59        int i;
  60        u32 size_each;
  61        u32 start;
  62
  63        pcie_io_space.name = "PCIe I/O Space";
  64        pcie_io_space.start = MV78XX0_PCIE_IO_PHYS_BASE(0);
  65        pcie_io_space.end =
  66                MV78XX0_PCIE_IO_PHYS_BASE(0) + MV78XX0_PCIE_IO_SIZE * 8 - 1;
  67        pcie_io_space.flags = IORESOURCE_MEM;
  68        if (request_resource(&iomem_resource, &pcie_io_space))
  69                panic("can't allocate PCIe I/O space");
  70
  71        if (num_pcie_ports > 7)
  72                panic("invalid number of PCIe ports");
  73
  74        size_each = pcie_port_size[num_pcie_ports];
  75
  76        start = MV78XX0_PCIE_MEM_PHYS_BASE;
  77        for (i = 0; i < num_pcie_ports; i++) {
  78                struct pcie_port *pp = pcie_port + i;
  79
  80                snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
  81                        "PCIe %d.%d MEM", pp->maj, pp->min);
  82                pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
  83                pp->res.name = pp->mem_space_name;
  84                pp->res.flags = IORESOURCE_MEM;
  85                pp->res.start = start;
  86                pp->res.end = start + size_each - 1;
  87                start += size_each;
  88
  89                if (request_resource(&iomem_resource, &pp->res))
  90                        panic("can't allocate PCIe MEM sub-space");
  91
  92                mvebu_mbus_add_window_by_id(MV78XX0_MBUS_PCIE_MEM_TARGET(pp->maj, pp->min),
  93                                            MV78XX0_MBUS_PCIE_MEM_ATTR(pp->maj, pp->min),
  94                                            pp->res.start, resource_size(&pp->res));
  95                mvebu_mbus_add_window_remap_by_id(MV78XX0_MBUS_PCIE_IO_TARGET(pp->maj, pp->min),
  96                                                  MV78XX0_MBUS_PCIE_IO_ATTR(pp->maj, pp->min),
  97                                                  i * SZ_64K, SZ_64K, 0);
  98        }
  99}
 100
 101static int __init mv78xx0_pcie_setup(int nr, struct pci_sys_data *sys)
 102{
 103        struct pcie_port *pp;
 104
 105        if (nr >= num_pcie_ports)
 106                return 0;
 107
 108        pp = &pcie_port[nr];
 109        sys->private_data = pp;
 110        pp->root_bus_nr = sys->busnr;
 111
 112        /*
 113         * Generic PCIe unit setup.
 114         */
 115        orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
 116        orion_pcie_setup(pp->base);
 117
 118        pci_ioremap_io(nr * SZ_64K, MV78XX0_PCIE_IO_PHYS_BASE(nr));
 119
 120        pci_add_resource_offset(&sys->resources, &pp->res, sys->mem_offset);
 121
 122        return 1;
 123}
 124
 125static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
 126{
 127        /*
 128         * Don't go out when trying to access nonexisting devices
 129         * on the local bus.
 130         */
 131        if (bus == pp->root_bus_nr && dev > 1)
 132                return 0;
 133
 134        return 1;
 135}
 136
 137static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 138                        int size, u32 *val)
 139{
 140        struct pci_sys_data *sys = bus->sysdata;
 141        struct pcie_port *pp = sys->private_data;
 142        unsigned long flags;
 143        int ret;
 144
 145        if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
 146                *val = 0xffffffff;
 147                return PCIBIOS_DEVICE_NOT_FOUND;
 148        }
 149
 150        spin_lock_irqsave(&pp->conf_lock, flags);
 151        ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
 152        spin_unlock_irqrestore(&pp->conf_lock, flags);
 153
 154        return ret;
 155}
 156
 157static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 158                        int where, int size, u32 val)
 159{
 160        struct pci_sys_data *sys = bus->sysdata;
 161        struct pcie_port *pp = sys->private_data;
 162        unsigned long flags;
 163        int ret;
 164
 165        if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
 166                return PCIBIOS_DEVICE_NOT_FOUND;
 167
 168        spin_lock_irqsave(&pp->conf_lock, flags);
 169        ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
 170        spin_unlock_irqrestore(&pp->conf_lock, flags);
 171
 172        return ret;
 173}
 174
 175static struct pci_ops pcie_ops = {
 176        .read = pcie_rd_conf,
 177        .write = pcie_wr_conf,
 178};
 179
 180static void rc_pci_fixup(struct pci_dev *dev)
 181{
 182        /*
 183         * Prevent enumeration of root complex.
 184         */
 185        if (dev->bus->parent == NULL && dev->devfn == 0) {
 186                int i;
 187
 188                for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 189                        dev->resource[i].start = 0;
 190                        dev->resource[i].end   = 0;
 191                        dev->resource[i].flags = 0;
 192                }
 193        }
 194}
 195DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
 196
 197static int __init mv78xx0_pcie_scan_bus(int nr, struct pci_host_bridge *bridge)
 198{
 199        struct pci_sys_data *sys = pci_host_bridge_priv(bridge);
 200
 201        if (nr >= num_pcie_ports) {
 202                BUG();
 203                return -EINVAL;
 204        }
 205
 206        list_splice_init(&sys->resources, &bridge->windows);
 207        bridge->dev.parent = NULL;
 208        bridge->sysdata = sys;
 209        bridge->busnr = sys->busnr;
 210        bridge->ops = &pcie_ops;
 211
 212        return pci_scan_root_bus_bridge(bridge);
 213}
 214
 215static int __init mv78xx0_pcie_map_irq(const struct pci_dev *dev, u8 slot,
 216        u8 pin)
 217{
 218        struct pci_sys_data *sys = dev->bus->sysdata;
 219        struct pcie_port *pp = sys->private_data;
 220
 221        return IRQ_MV78XX0_PCIE_00 + (pp->maj << 2) + pp->min;
 222}
 223
 224static struct hw_pci mv78xx0_pci __initdata = {
 225        .nr_controllers = 8,
 226        .preinit        = mv78xx0_pcie_preinit,
 227        .setup          = mv78xx0_pcie_setup,
 228        .scan           = mv78xx0_pcie_scan_bus,
 229        .map_irq        = mv78xx0_pcie_map_irq,
 230};
 231
 232static void __init add_pcie_port(int maj, int min, void __iomem *base)
 233{
 234        printk(KERN_INFO "MV78xx0 PCIe port %d.%d: ", maj, min);
 235
 236        if (orion_pcie_link_up(base)) {
 237                struct pcie_port *pp = &pcie_port[num_pcie_ports++];
 238
 239                printk("link up\n");
 240
 241                pp->maj = maj;
 242                pp->min = min;
 243                pp->root_bus_nr = -1;
 244                pp->base = base;
 245                spin_lock_init(&pp->conf_lock);
 246                memset(&pp->res, 0, sizeof(pp->res));
 247        } else {
 248                printk("link down, ignoring\n");
 249        }
 250}
 251
 252void __init mv78xx0_pcie_init(int init_port0, int init_port1)
 253{
 254        vga_base = MV78XX0_PCIE_MEM_PHYS_BASE;
 255
 256        if (init_port0) {
 257                add_pcie_port(0, 0, PCIE00_VIRT_BASE);
 258                if (!orion_pcie_x4_mode(PCIE00_VIRT_BASE)) {
 259                        add_pcie_port(0, 1, PCIE01_VIRT_BASE);
 260                        add_pcie_port(0, 2, PCIE02_VIRT_BASE);
 261                        add_pcie_port(0, 3, PCIE03_VIRT_BASE);
 262                }
 263        }
 264
 265        if (init_port1) {
 266                add_pcie_port(1, 0, PCIE10_VIRT_BASE);
 267                if (!orion_pcie_x4_mode((void __iomem *)PCIE10_VIRT_BASE)) {
 268                        add_pcie_port(1, 1, PCIE11_VIRT_BASE);
 269                        add_pcie_port(1, 2, PCIE12_VIRT_BASE);
 270                        add_pcie_port(1, 3, PCIE13_VIRT_BASE);
 271                }
 272        }
 273
 274        pci_common_init(&mv78xx0_pci);
 275}
 276