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edabd38e SB |
1 | /* |
2 | * arch/arm/mach-dove/pcie.c | |
3 | * | |
4 | * PCIe functions for Marvell Dove 88AP510 SoC | |
5 | * | |
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. | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/pci.h> | |
13 | #include <linux/mbus.h> | |
14 | #include <asm/mach/pci.h> | |
15 | #include <asm/mach/arch.h> | |
16 | #include <asm/setup.h> | |
17 | #include <asm/delay.h> | |
18 | #include <plat/pcie.h> | |
19 | #include <mach/irqs.h> | |
20 | #include <mach/bridge-regs.h> | |
21 | #include "common.h" | |
22 | ||
23 | struct pcie_port { | |
24 | u8 index; | |
25 | u8 root_bus_nr; | |
26 | void __iomem *base; | |
27 | spinlock_t conf_lock; | |
28 | char io_space_name[16]; | |
29 | char mem_space_name[16]; | |
30 | struct resource res[2]; | |
31 | }; | |
32 | ||
33 | static struct pcie_port pcie_port[2]; | |
34 | static int num_pcie_ports; | |
35 | ||
36 | ||
37 | static int __init dove_pcie_setup(int nr, struct pci_sys_data *sys) | |
38 | { | |
39 | struct pcie_port *pp; | |
40 | ||
41 | if (nr >= num_pcie_ports) | |
42 | return 0; | |
43 | ||
44 | pp = &pcie_port[nr]; | |
45 | pp->root_bus_nr = sys->busnr; | |
46 | ||
47 | /* | |
48 | * Generic PCIe unit setup. | |
49 | */ | |
50 | orion_pcie_set_local_bus_nr(pp->base, sys->busnr); | |
51 | ||
52 | orion_pcie_setup(pp->base, &dove_mbus_dram_info); | |
53 | ||
54 | /* | |
55 | * IORESOURCE_IO | |
56 | */ | |
57 | snprintf(pp->io_space_name, sizeof(pp->io_space_name), | |
58 | "PCIe %d I/O", pp->index); | |
59 | pp->io_space_name[sizeof(pp->io_space_name) - 1] = 0; | |
60 | pp->res[0].name = pp->io_space_name; | |
61 | if (pp->index == 0) { | |
62 | pp->res[0].start = DOVE_PCIE0_IO_PHYS_BASE; | |
63 | pp->res[0].end = pp->res[0].start + DOVE_PCIE0_IO_SIZE - 1; | |
64 | } else { | |
65 | pp->res[0].start = DOVE_PCIE1_IO_PHYS_BASE; | |
66 | pp->res[0].end = pp->res[0].start + DOVE_PCIE1_IO_SIZE - 1; | |
67 | } | |
68 | pp->res[0].flags = IORESOURCE_IO; | |
69 | if (request_resource(&ioport_resource, &pp->res[0])) | |
70 | panic("Request PCIe IO resource failed\n"); | |
71 | sys->resource[0] = &pp->res[0]; | |
72 | ||
73 | /* | |
74 | * IORESOURCE_MEM | |
75 | */ | |
76 | snprintf(pp->mem_space_name, sizeof(pp->mem_space_name), | |
77 | "PCIe %d MEM", pp->index); | |
78 | pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0; | |
79 | pp->res[1].name = pp->mem_space_name; | |
80 | if (pp->index == 0) { | |
81 | pp->res[1].start = DOVE_PCIE0_MEM_PHYS_BASE; | |
82 | pp->res[1].end = pp->res[1].start + DOVE_PCIE0_MEM_SIZE - 1; | |
83 | } else { | |
84 | pp->res[1].start = DOVE_PCIE1_MEM_PHYS_BASE; | |
85 | pp->res[1].end = pp->res[1].start + DOVE_PCIE1_MEM_SIZE - 1; | |
86 | } | |
87 | pp->res[1].flags = IORESOURCE_MEM; | |
88 | if (request_resource(&iomem_resource, &pp->res[1])) | |
89 | panic("Request PCIe Memory resource failed\n"); | |
90 | sys->resource[1] = &pp->res[1]; | |
91 | ||
92 | sys->resource[2] = NULL; | |
93 | ||
94 | return 1; | |
95 | } | |
96 | ||
97 | static struct pcie_port *bus_to_port(int bus) | |
98 | { | |
99 | int i; | |
100 | ||
101 | for (i = num_pcie_ports - 1; i >= 0; i--) { | |
102 | int rbus = pcie_port[i].root_bus_nr; | |
103 | if (rbus != -1 && rbus <= bus) | |
104 | break; | |
105 | } | |
106 | ||
107 | return i >= 0 ? pcie_port + i : NULL; | |
108 | } | |
109 | ||
110 | static int pcie_valid_config(struct pcie_port *pp, int bus, int dev) | |
111 | { | |
112 | /* | |
113 | * Don't go out when trying to access nonexisting devices | |
114 | * on the local bus. | |
115 | */ | |
116 | if (bus == pp->root_bus_nr && dev > 1) | |
117 | return 0; | |
118 | ||
119 | return 1; | |
120 | } | |
121 | ||
122 | static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, | |
123 | int size, u32 *val) | |
124 | { | |
125 | struct pcie_port *pp = bus_to_port(bus->number); | |
126 | unsigned long flags; | |
127 | int ret; | |
128 | ||
129 | if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) { | |
130 | *val = 0xffffffff; | |
131 | return PCIBIOS_DEVICE_NOT_FOUND; | |
132 | } | |
133 | ||
134 | spin_lock_irqsave(&pp->conf_lock, flags); | |
135 | ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val); | |
136 | spin_unlock_irqrestore(&pp->conf_lock, flags); | |
137 | ||
138 | return ret; | |
139 | } | |
140 | ||
141 | static int pcie_wr_conf(struct pci_bus *bus, u32 devfn, | |
142 | int where, int size, u32 val) | |
143 | { | |
144 | struct pcie_port *pp = bus_to_port(bus->number); | |
145 | unsigned long flags; | |
146 | int ret; | |
147 | ||
148 | if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) | |
149 | return PCIBIOS_DEVICE_NOT_FOUND; | |
150 | ||
151 | spin_lock_irqsave(&pp->conf_lock, flags); | |
152 | ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val); | |
153 | spin_unlock_irqrestore(&pp->conf_lock, flags); | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
158 | static struct pci_ops pcie_ops = { | |
159 | .read = pcie_rd_conf, | |
160 | .write = pcie_wr_conf, | |
161 | }; | |
162 | ||
163 | static void __devinit rc_pci_fixup(struct pci_dev *dev) | |
164 | { | |
165 | /* | |
166 | * Prevent enumeration of root complex. | |
167 | */ | |
168 | if (dev->bus->parent == NULL && dev->devfn == 0) { | |
169 | int i; | |
170 | ||
171 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { | |
172 | dev->resource[i].start = 0; | |
173 | dev->resource[i].end = 0; | |
174 | dev->resource[i].flags = 0; | |
175 | } | |
176 | } | |
177 | } | |
178 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup); | |
179 | ||
180 | static struct pci_bus __init * | |
181 | dove_pcie_scan_bus(int nr, struct pci_sys_data *sys) | |
182 | { | |
183 | struct pci_bus *bus; | |
184 | ||
185 | if (nr < num_pcie_ports) { | |
186 | bus = pci_scan_bus(sys->busnr, &pcie_ops, sys); | |
187 | } else { | |
188 | bus = NULL; | |
189 | BUG(); | |
190 | } | |
191 | ||
192 | return bus; | |
193 | } | |
194 | ||
195 | static int __init dove_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin) | |
196 | { | |
197 | struct pcie_port *pp = bus_to_port(dev->bus->number); | |
198 | ||
199 | return pp->index ? IRQ_DOVE_PCIE1 : IRQ_DOVE_PCIE0; | |
200 | } | |
201 | ||
202 | static struct hw_pci dove_pci __initdata = { | |
203 | .nr_controllers = 2, | |
204 | .swizzle = pci_std_swizzle, | |
205 | .setup = dove_pcie_setup, | |
206 | .scan = dove_pcie_scan_bus, | |
207 | .map_irq = dove_pcie_map_irq, | |
208 | }; | |
209 | ||
210 | static void __init add_pcie_port(int index, unsigned long base) | |
211 | { | |
212 | printk(KERN_INFO "Dove PCIe port %d: ", index); | |
213 | ||
214 | if (orion_pcie_link_up((void __iomem *)base)) { | |
215 | struct pcie_port *pp = &pcie_port[num_pcie_ports++]; | |
216 | ||
217 | printk(KERN_INFO "link up\n"); | |
218 | ||
219 | pp->index = index; | |
220 | pp->root_bus_nr = -1; | |
221 | pp->base = (void __iomem *)base; | |
222 | spin_lock_init(&pp->conf_lock); | |
223 | memset(pp->res, 0, sizeof(pp->res)); | |
224 | } else { | |
225 | printk(KERN_INFO "link down, ignoring\n"); | |
226 | } | |
227 | } | |
228 | ||
229 | void __init dove_pcie_init(int init_port0, int init_port1) | |
230 | { | |
231 | if (init_port0) | |
232 | add_pcie_port(0, DOVE_PCIE0_VIRT_BASE); | |
233 | ||
234 | if (init_port1) | |
235 | add_pcie_port(1, DOVE_PCIE1_VIRT_BASE); | |
236 | ||
237 | pci_common_init(&dove_pci); | |
238 | } |