1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* arch/arm/mach-kirkwood/pcie.c
*
* PCIe functions for Marvell Kirkwood SoCs
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/mbus.h>
#include <asm/irq.h>
#include <asm/mach/pci.h>
#include <plat/pcie.h>
#include <mach/bridge-regs.h>
#include "common.h"
#define PCIE_BASE ((void __iomem *)PCIE_VIRT_BASE)
void __init kirkwood_pcie_id(u32 *dev, u32 *rev)
{
*dev = orion_pcie_dev_id(PCIE_BASE);
*rev = orion_pcie_rev(PCIE_BASE);
}
static int pcie_valid_config(int bus, int dev)
{
/*
* Don't go out when trying to access --
* 1. nonexisting device on local bus
* 2. where there's no device connected (no link)
*/
if (bus == 0 && dev == 0)
return 1;
if (!orion_pcie_link_up(PCIE_BASE))
return 0;
if (bus == 0 && dev != 1)
return 0;
return 1;
}
/*
* PCIe config cycles are done by programming the PCIE_CONF_ADDR register
* and then reading the PCIE_CONF_DATA register. Need to make sure these
* transactions are atomic.
*/
static DEFINE_SPINLOCK(kirkwood_pcie_lock);
static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
int size, u32 *val)
{
unsigned long flags;
int ret;
if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
spin_lock_irqsave(&kirkwood_pcie_lock, flags);
ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
spin_unlock_irqrestore(&kirkwood_pcie_lock, flags);
return ret;
}
static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
int where, int size, u32 val)
{
unsigned long flags;
int ret;
if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
return PCIBIOS_DEVICE_NOT_FOUND;
spin_lock_irqsave(&kirkwood_pcie_lock, flags);
ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
spin_unlock_irqrestore(&kirkwood_pcie_lock, flags);
return ret;
}
static struct pci_ops pcie_ops = {
.read = pcie_rd_conf,
.write = pcie_wr_conf,
};
static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
{
struct resource *res;
extern unsigned int kirkwood_clk_ctrl;
/*
* Generic PCIe unit setup.
*/
orion_pcie_setup(PCIE_BASE, &kirkwood_mbus_dram_info);
/*
* Request resources.
*/
res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
if (!res)
panic("pcie_setup unable to alloc resources");
/*
* IORESOURCE_IO
*/
res[0].name = "PCIe I/O Space";
res[0].flags = IORESOURCE_IO;
res[0].start = KIRKWOOD_PCIE_IO_PHYS_BASE;
res[0].end = res[0].start + KIRKWOOD_PCIE_IO_SIZE - 1;
if (request_resource(&ioport_resource, &res[0]))
panic("Request PCIe IO resource failed\n");
sys->resource[0] = &res[0];
/*
* IORESOURCE_MEM
*/
res[1].name = "PCIe Memory Space";
res[1].flags = IORESOURCE_MEM;
res[1].start = KIRKWOOD_PCIE_MEM_PHYS_BASE;
res[1].end = res[1].start + KIRKWOOD_PCIE_MEM_SIZE - 1;
if (request_resource(&iomem_resource, &res[1]))
panic("Request PCIe Memory resource failed\n");
sys->resource[1] = &res[1];
sys->resource[2] = NULL;
sys->io_offset = 0;
kirkwood_clk_ctrl |= CGC_PEX0;
return 1;
}
static void __devinit rc_pci_fixup(struct pci_dev *dev)
{
/*
* Prevent enumeration of root complex.
*/
if (dev->bus->parent == NULL && dev->devfn == 0) {
int i;
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
dev->resource[i].start = 0;
dev->resource[i].end = 0;
dev->resource[i].flags = 0;
}
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
static struct pci_bus __init *
kirkwood_pcie_scan_bus(int nr, struct pci_sys_data *sys)
{
struct pci_bus *bus;
if (nr == 0) {
bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
} else {
bus = NULL;
BUG();
}
return bus;
}
static int __init kirkwood_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
return IRQ_KIRKWOOD_PCIE;
}
static struct hw_pci kirkwood_pci __initdata = {
.nr_controllers = 1,
.swizzle = pci_std_swizzle,
.setup = kirkwood_pcie_setup,
.scan = kirkwood_pcie_scan_bus,
.map_irq = kirkwood_pcie_map_irq,
};
void __init kirkwood_pcie_init(void)
{
pci_common_init(&kirkwood_pci);
}
|
