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/mbus.h> 14 #include <asm/mach/pci.h> 15 #include <asm/mach/arch.h> 16 #include <asm/setup.h> 17 #include <asm/delay.h> 18 #include <plat/pcie.h> 19 #include <mach/irqs.h> 20 #include <mach/bridge-regs.h> 21 #include "common.h" 22 23 struct pcie_port { 24 u8 index; 25 u8 root_bus_nr; 26 void __iomem *base; 27 spinlock_t conf_lock; 28 char io_space_name[16]; 29 char mem_space_name[16]; 30 struct resource res[2]; 31 }; 32 33 static struct pcie_port pcie_port[2]; 34 static int num_pcie_ports; 35 36 37 static int __init dove_pcie_setup(int nr, struct pci_sys_data *sys) 38 { 39 struct pcie_port *pp; 40 41 if (nr >= num_pcie_ports) 42 return 0; 43 44 pp = &pcie_port[nr]; 45 pp->root_bus_nr = sys->busnr; 46 47 /* 48 * Generic PCIe unit setup. 49 */ 50 orion_pcie_set_local_bus_nr(pp->base, sys->busnr); 51 52 orion_pcie_setup(pp->base, &dove_mbus_dram_info); 53 54 /* 55 * IORESOURCE_IO 56 */ 57 snprintf(pp->io_space_name, sizeof(pp->io_space_name), 58 "PCIe %d I/O", pp->index); 59 pp->io_space_name[sizeof(pp->io_space_name) - 1] = 0; 60 pp->res[0].name = pp->io_space_name; 61 if (pp->index == 0) { 62 pp->res[0].start = DOVE_PCIE0_IO_PHYS_BASE; 63 pp->res[0].end = pp->res[0].start + DOVE_PCIE0_IO_SIZE - 1; 64 } else { 65 pp->res[0].start = DOVE_PCIE1_IO_PHYS_BASE; 66 pp->res[0].end = pp->res[0].start + DOVE_PCIE1_IO_SIZE - 1; 67 } 68 pp->res[0].flags = IORESOURCE_IO; 69 if (request_resource(&ioport_resource, &pp->res[0])) 70 panic("Request PCIe IO resource failed\n"); 71 sys->resource[0] = &pp->res[0]; 72 73 /* 74 * IORESOURCE_MEM 75 */ 76 snprintf(pp->mem_space_name, sizeof(pp->mem_space_name), 77 "PCIe %d MEM", pp->index); 78 pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0; 79 pp->res[1].name = pp->mem_space_name; 80 if (pp->index == 0) { 81 pp->res[1].start = DOVE_PCIE0_MEM_PHYS_BASE; 82 pp->res[1].end = pp->res[1].start + DOVE_PCIE0_MEM_SIZE - 1; 83 } else { 84 pp->res[1].start = DOVE_PCIE1_MEM_PHYS_BASE; 85 pp->res[1].end = pp->res[1].start + DOVE_PCIE1_MEM_SIZE - 1; 86 } 87 pp->res[1].flags = IORESOURCE_MEM; 88 if (request_resource(&iomem_resource, &pp->res[1])) 89 panic("Request PCIe Memory resource failed\n"); 90 sys->resource[1] = &pp->res[1]; 91 92 sys->resource[2] = NULL; 93 94 return 1; 95 } 96 97 static struct pcie_port *bus_to_port(int bus) 98 { 99 int i; 100 101 for (i = num_pcie_ports - 1; i >= 0; i--) { 102 int rbus = pcie_port[i].root_bus_nr; 103 if (rbus != -1 && rbus <= bus) 104 break; 105 } 106 107 return i >= 0 ? pcie_port + i : NULL; 108 } 109 110 static int pcie_valid_config(struct pcie_port *pp, int bus, int dev) 111 { 112 /* 113 * Don't go out when trying to access nonexisting devices 114 * on the local bus. 115 */ 116 if (bus == pp->root_bus_nr && dev > 1) 117 return 0; 118 119 return 1; 120 } 121 122 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, 123 int size, u32 *val) 124 { 125 struct pcie_port *pp = bus_to_port(bus->number); 126 unsigned long flags; 127 int ret; 128 129 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) { 130 *val = 0xffffffff; 131 return PCIBIOS_DEVICE_NOT_FOUND; 132 } 133 134 spin_lock_irqsave(&pp->conf_lock, flags); 135 ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val); 136 spin_unlock_irqrestore(&pp->conf_lock, flags); 137 138 return ret; 139 } 140 141 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn, 142 int where, int size, u32 val) 143 { 144 struct pcie_port *pp = bus_to_port(bus->number); 145 unsigned long flags; 146 int ret; 147 148 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) 149 return PCIBIOS_DEVICE_NOT_FOUND; 150 151 spin_lock_irqsave(&pp->conf_lock, flags); 152 ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val); 153 spin_unlock_irqrestore(&pp->conf_lock, flags); 154 155 return ret; 156 } 157 158 static struct pci_ops pcie_ops = { 159 .read = pcie_rd_conf, 160 .write = pcie_wr_conf, 161 }; 162 163 static void __devinit rc_pci_fixup(struct pci_dev *dev) 164 { 165 /* 166 * Prevent enumeration of root complex. 167 */ 168 if (dev->bus->parent == NULL && dev->devfn == 0) { 169 int i; 170 171 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 172 dev->resource[i].start = 0; 173 dev->resource[i].end = 0; 174 dev->resource[i].flags = 0; 175 } 176 } 177 } 178 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup); 179 180 static struct pci_bus __init * 181 dove_pcie_scan_bus(int nr, struct pci_sys_data *sys) 182 { 183 struct pci_bus *bus; 184 185 if (nr < num_pcie_ports) { 186 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys); 187 } else { 188 bus = NULL; 189 BUG(); 190 } 191 192 return bus; 193 } 194 195 static int __init dove_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin) 196 { 197 struct pcie_port *pp = bus_to_port(dev->bus->number); 198 199 return pp->index ? IRQ_DOVE_PCIE1 : IRQ_DOVE_PCIE0; 200 } 201 202 static struct hw_pci dove_pci __initdata = { 203 .nr_controllers = 2, 204 .swizzle = pci_std_swizzle, 205 .setup = dove_pcie_setup, 206 .scan = dove_pcie_scan_bus, 207 .map_irq = dove_pcie_map_irq, 208 }; 209 210 static void __init add_pcie_port(int index, unsigned long base) 211 { 212 printk(KERN_INFO "Dove PCIe port %d: ", index); 213 214 if (orion_pcie_link_up((void __iomem *)base)) { 215 struct pcie_port *pp = &pcie_port[num_pcie_ports++]; 216 217 printk(KERN_INFO "link up\n"); 218 219 pp->index = index; 220 pp->root_bus_nr = -1; 221 pp->base = (void __iomem *)base; 222 spin_lock_init(&pp->conf_lock); 223 memset(pp->res, 0, sizeof(pp->res)); 224 } else { 225 printk(KERN_INFO "link down, ignoring\n"); 226 } 227 } 228 229 void __init dove_pcie_init(int init_port0, int init_port1) 230 { 231 if (init_port0) 232 add_pcie_port(0, DOVE_PCIE0_VIRT_BASE); 233 234 if (init_port1) 235 add_pcie_port(1, DOVE_PCIE1_VIRT_BASE); 236 237 pci_common_init(&dove_pci); 238 } 239