2 * arch/arm/mach-kirkwood/pcie.c
4 * PCIe functions for Marvell Kirkwood SoCs
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 <plat/pcie.h>
19 #define PCIE_BASE ((void __iomem *)PCIE_VIRT_BASE)
21 static int pcie_valid_config(int bus, int dev)
24 * Don't go out when trying to access --
25 * 1. nonexisting device on local bus
26 * 2. where there's no device connected (no link)
28 if (bus == 0 && dev == 0)
31 if (!orion_pcie_link_up(PCIE_BASE))
34 if (bus == 0 && dev != 1)
42 * PCIe config cycles are done by programming the PCIE_CONF_ADDR register
43 * and then reading the PCIE_CONF_DATA register. Need to make sure these
44 * transactions are atomic.
46 static DEFINE_SPINLOCK(kirkwood_pcie_lock);
48 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
54 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
56 return PCIBIOS_DEVICE_NOT_FOUND;
59 spin_lock_irqsave(&kirkwood_pcie_lock, flags);
60 ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
61 spin_unlock_irqrestore(&kirkwood_pcie_lock, flags);
66 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
67 int where, int size, u32 val)
72 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
73 return PCIBIOS_DEVICE_NOT_FOUND;
75 spin_lock_irqsave(&kirkwood_pcie_lock, flags);
76 ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
77 spin_unlock_irqrestore(&kirkwood_pcie_lock, flags);
82 static struct pci_ops pcie_ops = {
84 .write = pcie_wr_conf,
88 static int kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
93 * Generic PCIe unit setup.
95 orion_pcie_setup(PCIE_BASE, &kirkwood_mbus_dram_info);
100 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
102 panic("pcie_setup unable to alloc resources");
107 res[0].name = "PCIe I/O Space";
108 res[0].flags = IORESOURCE_IO;
109 res[0].start = KIRKWOOD_PCIE_IO_PHYS_BASE;
110 res[0].end = res[0].start + KIRKWOOD_PCIE_IO_SIZE - 1;
111 if (request_resource(&ioport_resource, &res[0]))
112 panic("Request PCIe IO resource failed\n");
113 sys->resource[0] = &res[0];
118 res[1].name = "PCIe Memory Space";
119 res[1].flags = IORESOURCE_MEM;
120 res[1].start = KIRKWOOD_PCIE_MEM_PHYS_BASE;
121 res[1].end = res[1].start + KIRKWOOD_PCIE_MEM_SIZE - 1;
122 if (request_resource(&iomem_resource, &res[1]))
123 panic("Request PCIe Memory resource failed\n");
124 sys->resource[1] = &res[1];
126 sys->resource[2] = NULL;
132 static void __devinit rc_pci_fixup(struct pci_dev *dev)
135 * Prevent enumeration of root complex.
137 if (dev->bus->parent == NULL && dev->devfn == 0) {
140 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
141 dev->resource[i].start = 0;
142 dev->resource[i].end = 0;
143 dev->resource[i].flags = 0;
147 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
149 static struct pci_bus __init *
150 kirkwood_pcie_scan_bus(int nr, struct pci_sys_data *sys)
155 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
164 static int __init kirkwood_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
166 return IRQ_KIRKWOOD_PCIE;
169 static struct hw_pci kirkwood_pci __initdata = {
171 .swizzle = pci_std_swizzle,
172 .setup = kirkwood_pcie_setup,
173 .scan = kirkwood_pcie_scan_bus,
174 .map_irq = kirkwood_pcie_map_irq,
177 void __init kirkwood_pcie_init(void)
179 pci_common_init(&kirkwood_pci);