arch/arm/mach-dove/pcie.c

   1 /*
   2  * arch/arm/mach-dove/pcie.c
   3  *
   4  * PCIe functions for Marvell Dove 88AP510 SoC
   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/clk.h>
  14 #include <video/vga.h>
  15 #include <asm/mach/pci.h>
  16 #include <asm/mach/arch.h>
  17 #include <asm/setup.h>
  18 #include <asm/delay.h>
  19 #include <plat/pcie.h>
  20 #include <plat/addr-map.h>
  21 #include "irqs.h"
  22 #include "bridge-regs.h"
  23 #include "common.h"
  24
  25 struct pcie_port {
  26         u8                      index;
  27         u8                      root_bus_nr;
  28         void __iomem            *base;
  29         spinlock_t              conf_lock;
  30         char                    mem_space_name[16];
  31         struct resource         res;
  32 };
  33
  34 static struct pcie_port pcie_port[2];
  35 static int num_pcie_ports;
  36
  37
  38 static int __init dove_pcie_setup(int nr, struct pci_sys_data *sys)
  39 {
  40         struct pcie_port *pp;
  41
  42         if (nr >= num_pcie_ports)
  43                 return 0;
  44
  45         pp = &pcie_port[nr];
  46         sys->private_data = pp;
  47         pp->root_bus_nr = sys->busnr;
  48
  49         /*
  50          * Generic PCIe unit setup.
  51          */
  52         orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
  53
  54         orion_pcie_setup(pp->base);
  55
  56         if (pp->index == 0)
  57                 pci_ioremap_io(sys->busnr * SZ_64K, DOVE_PCIE0_IO_PHYS_BASE);
  58         else
  59                 pci_ioremap_io(sys->busnr * SZ_64K, DOVE_PCIE1_IO_PHYS_BASE);
  60
  61         /*
  62          * IORESOURCE_MEM
  63          */
  64         snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
  65                  "PCIe %d MEM", pp->index);
  66         pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
  67         pp->res.name = pp->mem_space_name;
  68         if (pp->index == 0) {
  69                 pp->res.start = DOVE_PCIE0_MEM_PHYS_BASE;
  70                 pp->res.end = pp->res.start + DOVE_PCIE0_MEM_SIZE - 1;
  71         } else {
  72                 pp->res.start = DOVE_PCIE1_MEM_PHYS_BASE;
  73                 pp->res.end = pp->res.start + DOVE_PCIE1_MEM_SIZE - 1;
  74         }
  75         pp->res.flags = IORESOURCE_MEM;
  76         if (request_resource(&iomem_resource, &pp->res))
  77                 panic("Request PCIe Memory resource failed\n");
  78         pci_add_resource_offset(&sys->resources, &pp->res, sys->mem_offset);
  79
  80         return 1;
  81 }
  82
  83 static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
  84 {
  85         /*
  86          * Don't go out when trying to access nonexisting devices
  87          * on the local bus.
  88          */
  89         if (bus == pp->root_bus_nr && dev > 1)
  90                 return 0;
  91
  92         return 1;
  93 }
  94
  95 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
  96                         int size, u32 *val)
  97 {
  98         struct pci_sys_data *sys = bus->sysdata;
  99         struct pcie_port *pp = sys->private_data;
 100         unsigned long flags;
 101         int ret;
 102
 103         if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
 104                 *val = 0xffffffff;
 105                 return PCIBIOS_DEVICE_NOT_FOUND;
 106         }
 107
 108         spin_lock_irqsave(&pp->conf_lock, flags);
 109         ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
 110         spin_unlock_irqrestore(&pp->conf_lock, flags);
 111
 112         return ret;
 113 }
 114
 115 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 116                         int where, int size, u32 val)
 117 {
 118         struct pci_sys_data *sys = bus->sysdata;
 119         struct pcie_port *pp = sys->private_data;
 120         unsigned long flags;
 121         int ret;
 122
 123         if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
 124                 return PCIBIOS_DEVICE_NOT_FOUND;
 125
 126         spin_lock_irqsave(&pp->conf_lock, flags);
 127         ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
 128         spin_unlock_irqrestore(&pp->conf_lock, flags);
 129
 130         return ret;
 131 }
 132
 133 static struct pci_ops pcie_ops = {
 134         .read = pcie_rd_conf,
 135         .write = pcie_wr_conf,
 136 };
 137
 138 static void rc_pci_fixup(struct pci_dev *dev)
 139 {
 140         /*
 141          * Prevent enumeration of root complex.
 142          */
 143         if (dev->bus->parent == NULL && dev->devfn == 0) {
 144                 int i;
 145
 146                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 147                         dev->resource[i].start = 0;
 148                         dev->resource[i].end   = 0;
 149                         dev->resource[i].flags = 0;
 150                 }
 151         }
 152 }
 153 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
 154
 155 static int __init
 156 dove_pcie_scan_bus(int nr, struct pci_host_bridge *bridge)
 157 {
 158         struct pci_sys_data *sys = pci_host_bridge_priv(bridge);
 159
 160         if (nr >= num_pcie_ports) {
 161                 BUG();
 162                 return -EINVAL;
 163         }
 164
 165         list_splice_init(&sys->resources, &bridge->windows);
 166         bridge->dev.parent = NULL;
 167         bridge->sysdata = sys;
 168         bridge->busnr = sys->busnr;
 169         bridge->ops = &pcie_ops;
 170
 171         return pci_scan_root_bus_bridge(bridge);
 172 }
 173
 174 static int __init dove_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 175 {
 176         struct pci_sys_data *sys = dev->sysdata;
 177         struct pcie_port *pp = sys->private_data;
 178
 179         return pp->index ? IRQ_DOVE_PCIE1 : IRQ_DOVE_PCIE0;
 180 }
 181
 182 static struct hw_pci dove_pci __initdata = {
 183         .nr_controllers = 2,
 184         .setup          = dove_pcie_setup,
 185         .scan           = dove_pcie_scan_bus,
 186         .map_irq        = dove_pcie_map_irq,
 187 };
 188
 189 static void __init add_pcie_port(int index, void __iomem *base)
 190 {
 191         printk(KERN_INFO "Dove PCIe port %d: ", index);
 192
 193         if (orion_pcie_link_up(base)) {
 194                 struct pcie_port *pp = &pcie_port[num_pcie_ports++];
 195                 struct clk *clk = clk_get_sys("pcie", (index ? "1" : "0"));
 196
 197                 if (!IS_ERR(clk))
 198                         clk_prepare_enable(clk);
 199
 200                 printk(KERN_INFO "link up\n");
 201
 202                 pp->index = index;
 203                 pp->root_bus_nr = -1;
 204                 pp->base = base;
 205                 spin_lock_init(&pp->conf_lock);
 206                 memset(&pp->res, 0, sizeof(pp->res));
 207         } else {
 208                 printk(KERN_INFO "link down, ignoring\n");
 209         }
 210 }
 211
 212 void __init dove_pcie_init(int init_port0, int init_port1)
 213 {
 214         vga_base = DOVE_PCIE0_MEM_PHYS_BASE;
 215
 216         if (init_port0)
 217                 add_pcie_port(0, DOVE_PCIE0_VIRT_BASE);
 218
 219         if (init_port1)
 220                 add_pcie_port(1, DOVE_PCIE1_VIRT_BASE);
 221
 222         pci_common_init(&dove_pci);
 223 }