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>
18 #include <mach/mv78xx0.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
[16];
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
;
105 if (nr
>= num_pcie_ports
)
109 sys
->private_data
= pp
;
110 pp
->root_bus_nr
= sys
->busnr
;
113 * Generic PCIe unit setup.
115 orion_pcie_set_local_bus_nr(pp
->base
, sys
->busnr
);
116 orion_pcie_setup(pp
->base
);
118 pci_ioremap_io(nr
* SZ_64K
, MV78XX0_PCIE_IO_PHYS_BASE(nr
));
120 pci_add_resource_offset(&sys
->resources
, &pp
->res
, sys
->mem_offset
);
125 static int pcie_valid_config(struct pcie_port
*pp
, int bus
, int dev
)
128 * Don't go out when trying to access nonexisting devices
131 if (bus
== pp
->root_bus_nr
&& dev
> 1)
137 static int pcie_rd_conf(struct pci_bus
*bus
, u32 devfn
, int where
,
140 struct pci_sys_data
*sys
= bus
->sysdata
;
141 struct pcie_port
*pp
= sys
->private_data
;
145 if (pcie_valid_config(pp
, bus
->number
, PCI_SLOT(devfn
)) == 0) {
147 return PCIBIOS_DEVICE_NOT_FOUND
;
150 spin_lock_irqsave(&pp
->conf_lock
, flags
);
151 ret
= orion_pcie_rd_conf(pp
->base
, bus
, devfn
, where
, size
, val
);
152 spin_unlock_irqrestore(&pp
->conf_lock
, flags
);
157 static int pcie_wr_conf(struct pci_bus
*bus
, u32 devfn
,
158 int where
, int size
, u32 val
)
160 struct pci_sys_data
*sys
= bus
->sysdata
;
161 struct pcie_port
*pp
= sys
->private_data
;
165 if (pcie_valid_config(pp
, bus
->number
, PCI_SLOT(devfn
)) == 0)
166 return PCIBIOS_DEVICE_NOT_FOUND
;
168 spin_lock_irqsave(&pp
->conf_lock
, flags
);
169 ret
= orion_pcie_wr_conf(pp
->base
, bus
, devfn
, where
, size
, val
);
170 spin_unlock_irqrestore(&pp
->conf_lock
, flags
);
175 static struct pci_ops pcie_ops
= {
176 .read
= pcie_rd_conf
,
177 .write
= pcie_wr_conf
,
180 static void rc_pci_fixup(struct pci_dev
*dev
)
183 * Prevent enumeration of root complex.
185 if (dev
->bus
->parent
== NULL
&& dev
->devfn
== 0) {
188 for (i
= 0; i
< DEVICE_COUNT_RESOURCE
; i
++) {
189 dev
->resource
[i
].start
= 0;
190 dev
->resource
[i
].end
= 0;
191 dev
->resource
[i
].flags
= 0;
195 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL
, PCI_ANY_ID
, rc_pci_fixup
);
197 static struct pci_bus __init
*
198 mv78xx0_pcie_scan_bus(int nr
, struct pci_sys_data
*sys
)
200 if (nr
>= num_pcie_ports
) {
205 return pci_scan_root_bus(NULL
, sys
->busnr
, &pcie_ops
, sys
,
209 static int __init
mv78xx0_pcie_map_irq(const struct pci_dev
*dev
, u8 slot
,
212 struct pci_sys_data
*sys
= dev
->bus
->sysdata
;
213 struct pcie_port
*pp
= sys
->private_data
;
215 return IRQ_MV78XX0_PCIE_00
+ (pp
->maj
<< 2) + pp
->min
;
218 static struct hw_pci mv78xx0_pci __initdata
= {
220 .preinit
= mv78xx0_pcie_preinit
,
221 .setup
= mv78xx0_pcie_setup
,
222 .scan
= mv78xx0_pcie_scan_bus
,
223 .map_irq
= mv78xx0_pcie_map_irq
,
226 static void __init
add_pcie_port(int maj
, int min
, void __iomem
*base
)
228 printk(KERN_INFO
"MV78xx0 PCIe port %d.%d: ", maj
, min
);
230 if (orion_pcie_link_up(base
)) {
231 struct pcie_port
*pp
= &pcie_port
[num_pcie_ports
++];
237 pp
->root_bus_nr
= -1;
239 spin_lock_init(&pp
->conf_lock
);
240 memset(&pp
->res
, 0, sizeof(pp
->res
));
242 printk("link down, ignoring\n");
246 void __init
mv78xx0_pcie_init(int init_port0
, int init_port1
)
248 vga_base
= MV78XX0_PCIE_MEM_PHYS_BASE
;
251 add_pcie_port(0, 0, PCIE00_VIRT_BASE
);
252 if (!orion_pcie_x4_mode(PCIE00_VIRT_BASE
)) {
253 add_pcie_port(0, 1, PCIE01_VIRT_BASE
);
254 add_pcie_port(0, 2, PCIE02_VIRT_BASE
);
255 add_pcie_port(0, 3, PCIE03_VIRT_BASE
);
260 add_pcie_port(1, 0, PCIE10_VIRT_BASE
);
261 if (!orion_pcie_x4_mode((void __iomem
*)PCIE10_VIRT_BASE
)) {
262 add_pcie_port(1, 1, PCIE11_VIRT_BASE
);
263 add_pcie_port(1, 2, PCIE12_VIRT_BASE
);
264 add_pcie_port(1, 3, PCIE13_VIRT_BASE
);
268 pci_common_init(&mv78xx0_pci
);