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/slab.h>
14 #include <linux/mbus.h>
15 #include <video/vga.h>
17 #include <asm/mach/pci.h>
18 #include <plat/pcie.h>
19 #include <mach/bridge-regs.h>
20 #include <plat/addr-map.h>
23 void kirkwood_enable_pcie(void)
25 u32 curr = readl(CLOCK_GATING_CTRL);
26 if (!(curr & CGC_PEX0))
27 writel(curr | CGC_PEX0, CLOCK_GATING_CTRL);
30 void __init kirkwood_pcie_id(u32 *dev, u32 *rev)
32 kirkwood_enable_pcie();
33 *dev = orion_pcie_dev_id((void __iomem *)PCIE_VIRT_BASE);
34 *rev = orion_pcie_rev((void __iomem *)PCIE_VIRT_BASE);
42 struct resource res[2];
45 static int pcie_port_map[2];
46 static int num_pcie_ports;
48 static inline struct pcie_port *bus_to_port(struct pci_bus *bus)
50 struct pci_sys_data *sys = bus->sysdata;
51 return sys->private_data;
54 static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
57 * Don't go out when trying to access --
58 * 1. nonexisting device on local bus
59 * 2. where there's no device connected (no link)
61 if (bus == pp->root_bus_nr && dev == 0)
64 if (!orion_pcie_link_up(pp->base))
67 if (bus == pp->root_bus_nr && dev != 1)
75 * PCIe config cycles are done by programming the PCIE_CONF_ADDR register
76 * and then reading the PCIE_CONF_DATA register. Need to make sure these
77 * transactions are atomic.
80 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
83 struct pcie_port *pp = bus_to_port(bus);
87 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
89 return PCIBIOS_DEVICE_NOT_FOUND;
92 spin_lock_irqsave(&pp->conf_lock, flags);
93 ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
94 spin_unlock_irqrestore(&pp->conf_lock, flags);
99 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
100 int where, int size, u32 val)
102 struct pcie_port *pp = bus_to_port(bus);
106 if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
107 return PCIBIOS_DEVICE_NOT_FOUND;
109 spin_lock_irqsave(&pp->conf_lock, flags);
110 ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
111 spin_unlock_irqrestore(&pp->conf_lock, flags);
116 static struct pci_ops pcie_ops = {
117 .read = pcie_rd_conf,
118 .write = pcie_wr_conf,
121 static void __init pcie0_ioresources_init(struct pcie_port *pp)
123 pp->base = (void __iomem *)PCIE_VIRT_BASE;
124 pp->irq = IRQ_KIRKWOOD_PCIE;
129 pp->res[0].name = "PCIe 0 I/O Space";
130 pp->res[0].start = KIRKWOOD_PCIE_IO_BUS_BASE;
131 pp->res[0].end = pp->res[0].start + KIRKWOOD_PCIE_IO_SIZE - 1;
132 pp->res[0].flags = IORESOURCE_IO;
137 pp->res[1].name = "PCIe 0 MEM";
138 pp->res[1].start = KIRKWOOD_PCIE_MEM_PHYS_BASE;
139 pp->res[1].end = pp->res[1].start + KIRKWOOD_PCIE_MEM_SIZE - 1;
140 pp->res[1].flags = IORESOURCE_MEM;
143 static void __init pcie1_ioresources_init(struct pcie_port *pp)
145 pp->base = (void __iomem *)PCIE1_VIRT_BASE;
146 pp->irq = IRQ_KIRKWOOD_PCIE1;
151 pp->res[0].name = "PCIe 1 I/O Space";
152 pp->res[0].start = KIRKWOOD_PCIE1_IO_BUS_BASE;
153 pp->res[0].end = pp->res[0].start + KIRKWOOD_PCIE1_IO_SIZE - 1;
154 pp->res[0].flags = IORESOURCE_IO;
159 pp->res[1].name = "PCIe 1 MEM";
160 pp->res[1].start = KIRKWOOD_PCIE1_MEM_PHYS_BASE;
161 pp->res[1].end = pp->res[1].start + KIRKWOOD_PCIE1_MEM_SIZE - 1;
162 pp->res[1].flags = IORESOURCE_MEM;
165 static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
167 extern unsigned int kirkwood_clk_ctrl;
168 struct pcie_port *pp;
171 if (nr >= num_pcie_ports)
174 index = pcie_port_map[nr];
175 printk(KERN_INFO "PCI: bus%d uses PCIe port %d\n", sys->busnr, index);
177 pp = kzalloc(sizeof(*pp), GFP_KERNEL);
179 panic("PCIe: failed to allocate pcie_port data");
180 sys->private_data = pp;
181 pp->root_bus_nr = sys->busnr;
182 spin_lock_init(&pp->conf_lock);
186 kirkwood_clk_ctrl |= CGC_PEX0;
187 pcie0_ioresources_init(pp);
190 kirkwood_clk_ctrl |= CGC_PEX1;
191 pcie1_ioresources_init(pp);
194 panic("PCIe setup: invalid controller %d", index);
197 if (request_resource(&ioport_resource, &pp->res[0]))
198 panic("Request PCIe%d IO resource failed\n", index);
199 if (request_resource(&iomem_resource, &pp->res[1]))
200 panic("Request PCIe%d Memory resource failed\n", index);
202 sys->resource[0] = &pp->res[0];
203 sys->resource[1] = &pp->res[1];
204 sys->resource[2] = NULL;
208 * Generic PCIe unit setup.
210 orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
212 orion_pcie_setup(pp->base, &orion_mbus_dram_info);
217 static void __devinit rc_pci_fixup(struct pci_dev *dev)
220 * Prevent enumeration of root complex.
222 if (dev->bus->parent == NULL && dev->devfn == 0) {
225 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
226 dev->resource[i].start = 0;
227 dev->resource[i].end = 0;
228 dev->resource[i].flags = 0;
232 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
234 static struct pci_bus __init *
235 kirkwood_pcie_scan_bus(int nr, struct pci_sys_data *sys)
239 if (nr < num_pcie_ports) {
240 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
249 static int __init kirkwood_pcie_map_irq(const struct pci_dev *dev, u8 slot,
252 struct pcie_port *pp = bus_to_port(dev->bus);
257 static struct hw_pci kirkwood_pci __initdata = {
258 .swizzle = pci_std_swizzle,
259 .setup = kirkwood_pcie_setup,
260 .scan = kirkwood_pcie_scan_bus,
261 .map_irq = kirkwood_pcie_map_irq,
264 static void __init add_pcie_port(int index, unsigned long base)
266 printk(KERN_INFO "Kirkwood PCIe port %d: ", index);
268 if (orion_pcie_link_up((void __iomem *)base)) {
269 printk(KERN_INFO "link up\n");
270 pcie_port_map[num_pcie_ports++] = index;
272 printk(KERN_INFO "link down, ignoring\n");
275 void __init kirkwood_pcie_init(unsigned int portmask)
277 vga_base = KIRKWOOD_PCIE_MEM_PHYS_BASE;
279 if (portmask & KW_PCIE0)
280 add_pcie_port(0, PCIE_VIRT_BASE);
282 if (portmask & KW_PCIE1)
283 add_pcie_port(1, PCIE1_VIRT_BASE);
285 kirkwood_pci.nr_controllers = num_pcie_ports;
286 pci_common_init(&kirkwood_pci);