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>
14 #include <video/vga.h>
16 #include <asm/mach/pci.h>
17 #include <plat/pcie.h>
26 char io_space_name[16];
27 char mem_space_name[16];
28 struct resource res[2];
31 static struct pcie_port pcie_port[8];
32 static int num_pcie_ports;
33 static struct resource pcie_io_space;
34 static struct resource pcie_mem_space;
37 void __init mv78xx0_pcie_id(u32 *dev, u32 *rev)
39 *dev = orion_pcie_dev_id((void __iomem *)PCIE00_VIRT_BASE);
40 *rev = orion_pcie_rev((void __iomem *)PCIE00_VIRT_BASE);
43 static void __init mv78xx0_pcie_preinit(void)
50 pcie_io_space.name = "PCIe I/O Space";
51 pcie_io_space.start = MV78XX0_PCIE_IO_PHYS_BASE(0);
53 MV78XX0_PCIE_IO_PHYS_BASE(0) + MV78XX0_PCIE_IO_SIZE * 8 - 1;
54 pcie_io_space.flags = IORESOURCE_IO;
55 if (request_resource(&iomem_resource, &pcie_io_space))
56 panic("can't allocate PCIe I/O space");
58 pcie_mem_space.name = "PCIe MEM Space";
59 pcie_mem_space.start = MV78XX0_PCIE_MEM_PHYS_BASE;
61 MV78XX0_PCIE_MEM_PHYS_BASE + MV78XX0_PCIE_MEM_SIZE - 1;
62 pcie_mem_space.flags = IORESOURCE_MEM;
63 if (request_resource(&iomem_resource, &pcie_mem_space))
64 panic("can't allocate PCIe MEM space");
66 for (i = 0; i < num_pcie_ports; i++) {
67 struct pcie_port *pp = pcie_port + i;
69 snprintf(pp->io_space_name, sizeof(pp->io_space_name),
70 "PCIe %d.%d I/O", pp->maj, pp->min);
71 pp->io_space_name[sizeof(pp->io_space_name) - 1] = 0;
72 pp->res[0].name = pp->io_space_name;
73 pp->res[0].start = MV78XX0_PCIE_IO_PHYS_BASE(i);
74 pp->res[0].end = pp->res[0].start + MV78XX0_PCIE_IO_SIZE - 1;
75 pp->res[0].flags = IORESOURCE_IO;
77 snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
78 "PCIe %d.%d MEM", pp->maj, pp->min);
79 pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
80 pp->res[1].name = pp->mem_space_name;
81 pp->res[1].flags = IORESOURCE_MEM;
84 switch (num_pcie_ports) {
90 size_each = 0x30000000;
94 size_each = 0x10000000;
98 size_each = 0x08000000;
102 size_each = 0x04000000;
106 panic("invalid number of PCIe ports");
109 start = MV78XX0_PCIE_MEM_PHYS_BASE;
110 for (i = 0; i < num_pcie_ports; i++) {
111 struct pcie_port *pp = pcie_port + i;
113 pp->res[1].start = start;
114 pp->res[1].end = start + size_each - 1;
118 for (i = 0; i < num_pcie_ports; i++) {
119 struct pcie_port *pp = pcie_port + i;
121 if (request_resource(&pcie_io_space, &pp->res[0]))
122 panic("can't allocate PCIe I/O sub-space");
124 if (request_resource(&pcie_mem_space, &pp->res[1]))
125 panic("can't allocate PCIe MEM sub-space");
129 for (i = 0; i < num_pcie_ports; i++) {
130 struct pcie_port *pp = pcie_port + i;
132 mv78xx0_setup_pcie_io_win(win++, pp->res[0].start,
133 resource_size(&pp->res[0]),
136 mv78xx0_setup_pcie_mem_win(win++, pp->res[1].start,
137 resource_size(&pp->res[1]),
142 static int __init mv78xx0_pcie_setup(int nr, struct pci_sys_data *sys)
144 struct pcie_port *pp;
146 if (nr >= num_pcie_ports)
150 pp->root_bus_nr = sys->busnr;
153 * Generic PCIe unit setup.
155 orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
156 orion_pcie_setup(pp->base, &mv78xx0_mbus_dram_info);
158 sys->resource[0] = &pp->res[0];
159 sys->resource[1] = &pp->res[1];
160 sys->resource[2] = NULL;
165 static struct pcie_port *bus_to_port(int bus)
169 for (i = num_pcie_ports - 1; i >= 0; i--) {
170 int rbus = pcie_port[i].root_bus_nr;
171 if (rbus != -1 && rbus <= bus)
175 return i >= 0 ? pcie_port + i : NULL;
178 static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
181 * Don't go out when trying to access nonexisting devices
184 if (bus == pp->root_bus_nr && dev > 1)
190 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
193 struct pcie_port *pp = bus_to_port(bus->number);
197 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
199 return PCIBIOS_DEVICE_NOT_FOUND;
202 spin_lock_irqsave(&pp->conf_lock, flags);
203 ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
204 spin_unlock_irqrestore(&pp->conf_lock, flags);
209 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
210 int where, int size, u32 val)
212 struct pcie_port *pp = bus_to_port(bus->number);
216 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
217 return PCIBIOS_DEVICE_NOT_FOUND;
219 spin_lock_irqsave(&pp->conf_lock, flags);
220 ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
221 spin_unlock_irqrestore(&pp->conf_lock, flags);
226 static struct pci_ops pcie_ops = {
227 .read = pcie_rd_conf,
228 .write = pcie_wr_conf,
231 static void __devinit rc_pci_fixup(struct pci_dev *dev)
234 * Prevent enumeration of root complex.
236 if (dev->bus->parent == NULL && dev->devfn == 0) {
239 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
240 dev->resource[i].start = 0;
241 dev->resource[i].end = 0;
242 dev->resource[i].flags = 0;
246 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
248 static struct pci_bus __init *
249 mv78xx0_pcie_scan_bus(int nr, struct pci_sys_data *sys)
253 if (nr < num_pcie_ports) {
254 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
263 static int __init mv78xx0_pcie_map_irq(const struct pci_dev *dev, u8 slot,
266 struct pcie_port *pp = bus_to_port(dev->bus->number);
268 return IRQ_MV78XX0_PCIE_00 + (pp->maj << 2) + pp->min;
271 static struct hw_pci mv78xx0_pci __initdata = {
273 .preinit = mv78xx0_pcie_preinit,
274 .swizzle = pci_std_swizzle,
275 .setup = mv78xx0_pcie_setup,
276 .scan = mv78xx0_pcie_scan_bus,
277 .map_irq = mv78xx0_pcie_map_irq,
280 static void __init add_pcie_port(int maj, int min, unsigned long base)
282 printk(KERN_INFO "MV78xx0 PCIe port %d.%d: ", maj, min);
284 if (orion_pcie_link_up((void __iomem *)base)) {
285 struct pcie_port *pp = &pcie_port[num_pcie_ports++];
291 pp->root_bus_nr = -1;
292 pp->base = (void __iomem *)base;
293 spin_lock_init(&pp->conf_lock);
294 memset(pp->res, 0, sizeof(pp->res));
296 printk("link down, ignoring\n");
300 void __init mv78xx0_pcie_init(int init_port0, int init_port1)
302 vga_base = MV78XX0_PCIE_MEM_PHYS_BASE;
305 add_pcie_port(0, 0, PCIE00_VIRT_BASE);
306 if (!orion_pcie_x4_mode((void __iomem *)PCIE00_VIRT_BASE)) {
307 add_pcie_port(0, 1, PCIE01_VIRT_BASE);
308 add_pcie_port(0, 2, PCIE02_VIRT_BASE);
309 add_pcie_port(0, 3, PCIE03_VIRT_BASE);
314 add_pcie_port(1, 0, PCIE10_VIRT_BASE);
315 if (!orion_pcie_x4_mode((void __iomem *)PCIE10_VIRT_BASE)) {
316 add_pcie_port(1, 1, PCIE11_VIRT_BASE);
317 add_pcie_port(1, 2, PCIE12_VIRT_BASE);
318 add_pcie_port(1, 3, PCIE13_VIRT_BASE);
322 pci_common_init(&mv78xx0_pci);