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>
21 #define MV78XX0_MBUS_PCIE_MEM_TARGET(port, lane) ((port) ? 8 : 4)
22 #define MV78XX0_MBUS_PCIE_MEM_ATTR(port, lane) (0xf8 & ~(0x10 << (lane)))
23 #define MV78XX0_MBUS_PCIE_IO_TARGET(port, lane) ((port) ? 8 : 4)
24 #define MV78XX0_MBUS_PCIE_IO_ATTR(port, lane) (0xf0 & ~(0x10 << (lane)))
32 char mem_space_name[20];
36 static struct pcie_port pcie_port[8];
37 static int num_pcie_ports;
38 static struct resource pcie_io_space;
40 void __init mv78xx0_pcie_id(u32 *dev, u32 *rev)
42 *dev = orion_pcie_dev_id(PCIE00_VIRT_BASE);
43 *rev = orion_pcie_rev(PCIE00_VIRT_BASE);
46 u32 pcie_port_size[8] = {
57 static void __init mv78xx0_pcie_preinit(void)
63 pcie_io_space.name = "PCIe I/O Space";
64 pcie_io_space.start = MV78XX0_PCIE_IO_PHYS_BASE(0);
66 MV78XX0_PCIE_IO_PHYS_BASE(0) + MV78XX0_PCIE_IO_SIZE * 8 - 1;
67 pcie_io_space.flags = IORESOURCE_MEM;
68 if (request_resource(&iomem_resource, &pcie_io_space))
69 panic("can't allocate PCIe I/O space");
71 if (num_pcie_ports > 7)
72 panic("invalid number of PCIe ports");
74 size_each = pcie_port_size[num_pcie_ports];
76 start = MV78XX0_PCIE_MEM_PHYS_BASE;
77 for (i = 0; i < num_pcie_ports; i++) {
78 struct pcie_port *pp = pcie_port + i;
80 snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
81 "PCIe %d.%d MEM", pp->maj, pp->min);
82 pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
83 pp->res.name = pp->mem_space_name;
84 pp->res.flags = IORESOURCE_MEM;
85 pp->res.start = start;
86 pp->res.end = start + size_each - 1;
89 if (request_resource(&iomem_resource, &pp->res))
90 panic("can't allocate PCIe MEM sub-space");
92 mvebu_mbus_add_window_by_id(MV78XX0_MBUS_PCIE_MEM_TARGET(pp->maj, pp->min),
93 MV78XX0_MBUS_PCIE_MEM_ATTR(pp->maj, pp->min),
94 pp->res.start, resource_size(&pp->res));
95 mvebu_mbus_add_window_remap_by_id(MV78XX0_MBUS_PCIE_IO_TARGET(pp->maj, pp->min),
96 MV78XX0_MBUS_PCIE_IO_ATTR(pp->maj, pp->min),
97 i * SZ_64K, SZ_64K, 0);
101 static int __init mv78xx0_pcie_setup(int nr, struct pci_sys_data *sys)
103 struct pcie_port *pp;
104 struct resource realio;
106 if (nr >= num_pcie_ports)
110 sys->private_data = pp;
111 pp->root_bus_nr = sys->busnr;
114 * Generic PCIe unit setup.
116 orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
117 orion_pcie_setup(pp->base);
119 realio.start = nr * SZ_64K;
120 realio.end = realio.start + SZ_64K - 1;
121 pci_remap_iospace(&realio, MV78XX0_PCIE_IO_PHYS_BASE(nr));
123 pci_add_resource_offset(&sys->resources, &pp->res, sys->mem_offset);
128 static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
131 * Don't go out when trying to access nonexisting devices
134 if (bus == pp->root_bus_nr && dev > 1)
140 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
143 struct pci_sys_data *sys = bus->sysdata;
144 struct pcie_port *pp = sys->private_data;
148 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
150 return PCIBIOS_DEVICE_NOT_FOUND;
153 spin_lock_irqsave(&pp->conf_lock, flags);
154 ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
155 spin_unlock_irqrestore(&pp->conf_lock, flags);
160 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
161 int where, int size, u32 val)
163 struct pci_sys_data *sys = bus->sysdata;
164 struct pcie_port *pp = sys->private_data;
168 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
169 return PCIBIOS_DEVICE_NOT_FOUND;
171 spin_lock_irqsave(&pp->conf_lock, flags);
172 ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
173 spin_unlock_irqrestore(&pp->conf_lock, flags);
178 static struct pci_ops pcie_ops = {
179 .read = pcie_rd_conf,
180 .write = pcie_wr_conf,
183 static void rc_pci_fixup(struct pci_dev *dev)
186 * Prevent enumeration of root complex.
188 if (dev->bus->parent == NULL && dev->devfn == 0) {
191 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
192 dev->resource[i].start = 0;
193 dev->resource[i].end = 0;
194 dev->resource[i].flags = 0;
198 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
200 static int __init mv78xx0_pcie_scan_bus(int nr, struct pci_host_bridge *bridge)
202 struct pci_sys_data *sys = pci_host_bridge_priv(bridge);
204 if (nr >= num_pcie_ports) {
209 list_splice_init(&sys->resources, &bridge->windows);
210 bridge->dev.parent = NULL;
211 bridge->sysdata = sys;
212 bridge->busnr = sys->busnr;
213 bridge->ops = &pcie_ops;
215 return pci_scan_root_bus_bridge(bridge);
218 static int __init mv78xx0_pcie_map_irq(const struct pci_dev *dev, u8 slot,
221 struct pci_sys_data *sys = dev->bus->sysdata;
222 struct pcie_port *pp = sys->private_data;
224 return IRQ_MV78XX0_PCIE_00 + (pp->maj << 2) + pp->min;
227 static struct hw_pci mv78xx0_pci __initdata = {
229 .preinit = mv78xx0_pcie_preinit,
230 .setup = mv78xx0_pcie_setup,
231 .scan = mv78xx0_pcie_scan_bus,
232 .map_irq = mv78xx0_pcie_map_irq,
235 static void __init add_pcie_port(int maj, int min, void __iomem *base)
237 printk(KERN_INFO "MV78xx0 PCIe port %d.%d: ", maj, min);
239 if (orion_pcie_link_up(base)) {
240 struct pcie_port *pp = &pcie_port[num_pcie_ports++];
246 pp->root_bus_nr = -1;
248 spin_lock_init(&pp->conf_lock);
249 memset(&pp->res, 0, sizeof(pp->res));
251 printk("link down, ignoring\n");
255 void __init mv78xx0_pcie_init(int init_port0, int init_port1)
257 vga_base = MV78XX0_PCIE_MEM_PHYS_BASE;
260 add_pcie_port(0, 0, PCIE00_VIRT_BASE);
261 if (!orion_pcie_x4_mode(PCIE00_VIRT_BASE)) {
262 add_pcie_port(0, 1, PCIE01_VIRT_BASE);
263 add_pcie_port(0, 2, PCIE02_VIRT_BASE);
264 add_pcie_port(0, 3, PCIE03_VIRT_BASE);
269 add_pcie_port(1, 0, PCIE10_VIRT_BASE);
270 if (!orion_pcie_x4_mode((void __iomem *)PCIE10_VIRT_BASE)) {
271 add_pcie_port(1, 1, PCIE11_VIRT_BASE);
272 add_pcie_port(1, 2, PCIE12_VIRT_BASE);
273 add_pcie_port(1, 3, PCIE13_VIRT_BASE);
277 pci_common_init(&mv78xx0_pci);