2 * arch/arm/mach-mv78xx0/pcie.c
4 * PCIe functions for Marvell MV78xx0 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>
15 #include <asm/mach/pci.h>
16 #include <plat/pcie.h>
25 char io_space_name[16];
26 char mem_space_name[16];
27 struct resource res[2];
30 static struct pcie_port pcie_port[8];
31 static int num_pcie_ports;
32 static struct resource pcie_io_space;
33 static struct resource pcie_mem_space;
36 static void __init mv78xx0_pcie_preinit(void)
43 pcie_io_space.name = "PCIe I/O Space";
44 pcie_io_space.start = MV78XX0_PCIE_IO_PHYS_BASE(0);
46 MV78XX0_PCIE_IO_PHYS_BASE(0) + MV78XX0_PCIE_IO_SIZE * 8 - 1;
47 pcie_io_space.flags = IORESOURCE_IO;
48 if (request_resource(&iomem_resource, &pcie_io_space))
49 panic("can't allocate PCIe I/O space");
51 pcie_mem_space.name = "PCIe MEM Space";
52 pcie_mem_space.start = MV78XX0_PCIE_MEM_PHYS_BASE;
54 MV78XX0_PCIE_MEM_PHYS_BASE + MV78XX0_PCIE_MEM_SIZE - 1;
55 pcie_mem_space.flags = IORESOURCE_MEM;
56 if (request_resource(&iomem_resource, &pcie_mem_space))
57 panic("can't allocate PCIe MEM space");
59 for (i = 0; i < num_pcie_ports; i++) {
60 struct pcie_port *pp = pcie_port + i;
62 snprintf(pp->io_space_name, sizeof(pp->io_space_name),
63 "PCIe %d.%d I/O", pp->maj, pp->min);
64 pp->io_space_name[sizeof(pp->io_space_name) - 1] = 0;
65 pp->res[0].name = pp->io_space_name;
66 pp->res[0].start = MV78XX0_PCIE_IO_PHYS_BASE(i);
67 pp->res[0].end = pp->res[0].start + MV78XX0_PCIE_IO_SIZE - 1;
68 pp->res[0].flags = IORESOURCE_IO;
70 snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
71 "PCIe %d.%d MEM", pp->maj, pp->min);
72 pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
73 pp->res[1].name = pp->mem_space_name;
74 pp->res[1].flags = IORESOURCE_MEM;
77 switch (num_pcie_ports) {
83 size_each = 0x30000000;
87 size_each = 0x10000000;
91 size_each = 0x08000000;
95 size_each = 0x04000000;
99 panic("invalid number of PCIe ports");
102 start = MV78XX0_PCIE_MEM_PHYS_BASE;
103 for (i = 0; i < num_pcie_ports; i++) {
104 struct pcie_port *pp = pcie_port + i;
106 pp->res[1].start = start;
107 pp->res[1].end = start + size_each - 1;
111 for (i = 0; i < num_pcie_ports; i++) {
112 struct pcie_port *pp = pcie_port + i;
114 if (request_resource(&pcie_io_space, &pp->res[0]))
115 panic("can't allocate PCIe I/O sub-space");
117 if (request_resource(&pcie_mem_space, &pp->res[1]))
118 panic("can't allocate PCIe MEM sub-space");
122 for (i = 0; i < num_pcie_ports; i++) {
123 struct pcie_port *pp = pcie_port + i;
125 mv78xx0_setup_pcie_io_win(win++, pp->res[0].start,
126 pp->res[0].end - pp->res[0].start + 1,
129 mv78xx0_setup_pcie_mem_win(win++, pp->res[1].start,
130 pp->res[1].end - pp->res[1].start + 1,
135 static int __init mv78xx0_pcie_setup(int nr, struct pci_sys_data *sys)
137 struct pcie_port *pp;
139 if (nr >= num_pcie_ports)
143 pp->root_bus_nr = sys->busnr;
146 * Generic PCIe unit setup.
148 orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
149 orion_pcie_setup(pp->base, &mv78xx0_mbus_dram_info);
151 sys->resource[0] = &pp->res[0];
152 sys->resource[1] = &pp->res[1];
153 sys->resource[2] = NULL;
158 static struct pcie_port *bus_to_port(int bus)
162 for (i = num_pcie_ports - 1; i >= 0; i--) {
163 int rbus = pcie_port[i].root_bus_nr;
164 if (rbus != -1 && rbus <= bus)
168 return i >= 0 ? pcie_port + i : NULL;
171 static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
174 * Don't go out when trying to access nonexisting devices
177 if (bus == pp->root_bus_nr && dev > 1)
183 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
186 struct pcie_port *pp = bus_to_port(bus->number);
190 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
192 return PCIBIOS_DEVICE_NOT_FOUND;
195 spin_lock_irqsave(&pp->conf_lock, flags);
196 ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
197 spin_unlock_irqrestore(&pp->conf_lock, flags);
202 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
203 int where, int size, u32 val)
205 struct pcie_port *pp = bus_to_port(bus->number);
209 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
210 return PCIBIOS_DEVICE_NOT_FOUND;
212 spin_lock_irqsave(&pp->conf_lock, flags);
213 ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
214 spin_unlock_irqrestore(&pp->conf_lock, flags);
219 static struct pci_ops pcie_ops = {
220 .read = pcie_rd_conf,
221 .write = pcie_wr_conf,
224 static void __devinit rc_pci_fixup(struct pci_dev *dev)
227 * Prevent enumeration of root complex.
229 if (dev->bus->parent == NULL && dev->devfn == 0) {
232 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
233 dev->resource[i].start = 0;
234 dev->resource[i].end = 0;
235 dev->resource[i].flags = 0;
239 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
241 static struct pci_bus __init *
242 mv78xx0_pcie_scan_bus(int nr, struct pci_sys_data *sys)
246 if (nr < num_pcie_ports) {
247 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
256 static int __init mv78xx0_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
258 struct pcie_port *pp = bus_to_port(dev->bus->number);
260 return IRQ_MV78XX0_PCIE_00 + (pp->maj << 2) + pp->min;
263 static struct hw_pci mv78xx0_pci __initdata = {
265 .preinit = mv78xx0_pcie_preinit,
266 .swizzle = pci_std_swizzle,
267 .setup = mv78xx0_pcie_setup,
268 .scan = mv78xx0_pcie_scan_bus,
269 .map_irq = mv78xx0_pcie_map_irq,
272 static void __init add_pcie_port(int maj, int min, unsigned long base)
274 printk(KERN_INFO "MV78xx0 PCIe port %d.%d: ", maj, min);
276 if (orion_pcie_link_up((void __iomem *)base)) {
277 struct pcie_port *pp = &pcie_port[num_pcie_ports++];
283 pp->root_bus_nr = -1;
284 pp->base = (void __iomem *)base;
285 spin_lock_init(&pp->conf_lock);
286 memset(pp->res, 0, sizeof(pp->res));
288 printk("link down, ignoring\n");
292 void __init mv78xx0_pcie_init(int init_port0, int init_port1)
295 add_pcie_port(0, 0, PCIE00_VIRT_BASE);
296 if (!orion_pcie_x4_mode((void __iomem *)PCIE00_VIRT_BASE)) {
297 add_pcie_port(0, 1, PCIE01_VIRT_BASE);
298 add_pcie_port(0, 2, PCIE02_VIRT_BASE);
299 add_pcie_port(0, 3, PCIE03_VIRT_BASE);
304 add_pcie_port(1, 0, PCIE10_VIRT_BASE);
305 if (!orion_pcie_x4_mode((void __iomem *)PCIE10_VIRT_BASE)) {
306 add_pcie_port(1, 1, PCIE11_VIRT_BASE);
307 add_pcie_port(1, 2, PCIE12_VIRT_BASE);
308 add_pcie_port(1, 3, PCIE13_VIRT_BASE);
312 pci_common_init(&mv78xx0_pci);