2 * arch/arm/mach-dove/pcie.c
4 * PCIe functions for Marvell Dove 88AP510 SoC
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.
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>
28 char io_space_name[16];
29 char mem_space_name[16];
30 struct resource res[2];
33 static struct pcie_port pcie_port[2];
34 static int num_pcie_ports;
37 static int __init dove_pcie_setup(int nr, struct pci_sys_data *sys)
41 if (nr >= num_pcie_ports)
45 pp->root_bus_nr = sys->busnr;
48 * Generic PCIe unit setup.
50 orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
52 orion_pcie_setup(pp->base, &dove_mbus_dram_info);
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;
62 pp->res[0].start = DOVE_PCIE0_IO_PHYS_BASE;
63 pp->res[0].end = pp->res[0].start + DOVE_PCIE0_IO_SIZE - 1;
65 pp->res[0].start = DOVE_PCIE1_IO_PHYS_BASE;
66 pp->res[0].end = pp->res[0].start + DOVE_PCIE1_IO_SIZE - 1;
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];
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;
81 pp->res[1].start = DOVE_PCIE0_MEM_PHYS_BASE;
82 pp->res[1].end = pp->res[1].start + DOVE_PCIE0_MEM_SIZE - 1;
84 pp->res[1].start = DOVE_PCIE1_MEM_PHYS_BASE;
85 pp->res[1].end = pp->res[1].start + DOVE_PCIE1_MEM_SIZE - 1;
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];
92 sys->resource[2] = NULL;
97 static struct pcie_port *bus_to_port(int bus)
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)
107 return i >= 0 ? pcie_port + i : NULL;
110 static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
113 * Don't go out when trying to access nonexisting devices
116 if (bus == pp->root_bus_nr && dev > 1)
122 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
125 struct pcie_port *pp = bus_to_port(bus->number);
129 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
131 return PCIBIOS_DEVICE_NOT_FOUND;
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);
141 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
142 int where, int size, u32 val)
144 struct pcie_port *pp = bus_to_port(bus->number);
148 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
149 return PCIBIOS_DEVICE_NOT_FOUND;
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);
158 static struct pci_ops pcie_ops = {
159 .read = pcie_rd_conf,
160 .write = pcie_wr_conf,
163 static void __devinit rc_pci_fixup(struct pci_dev *dev)
166 * Prevent enumeration of root complex.
168 if (dev->bus->parent == NULL && dev->devfn == 0) {
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;
178 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
180 static struct pci_bus __init *
181 dove_pcie_scan_bus(int nr, struct pci_sys_data *sys)
185 if (nr < num_pcie_ports) {
186 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
195 static int __init dove_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
197 struct pcie_port *pp = bus_to_port(dev->bus->number);
199 return pp->index ? IRQ_DOVE_PCIE1 : IRQ_DOVE_PCIE0;
202 static struct hw_pci dove_pci __initdata = {
204 .swizzle = pci_std_swizzle,
205 .setup = dove_pcie_setup,
206 .scan = dove_pcie_scan_bus,
207 .map_irq = dove_pcie_map_irq,
210 static void __init add_pcie_port(int index, unsigned long base)
212 printk(KERN_INFO "Dove PCIe port %d: ", index);
214 if (orion_pcie_link_up((void __iomem *)base)) {
215 struct pcie_port *pp = &pcie_port[num_pcie_ports++];
217 printk(KERN_INFO "link up\n");
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));
225 printk(KERN_INFO "link down, ignoring\n");
229 void __init dove_pcie_init(int init_port0, int init_port1)
232 add_pcie_port(0, DOVE_PCIE0_VIRT_BASE);
235 add_pcie_port(1, DOVE_PCIE1_VIRT_BASE);
237 pci_common_init(&dove_pci);