]>
git.ipfire.org Git - people/ms/u-boot.git/blob - cpu/mpc83xx/pci.c
2 * Copyright (C) Freescale Semiconductor, Inc. 2007
4 * Author: Scott Wood <scottwood@freescale.com>,
5 * with some bits from older board-specific PCI initialization.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <asm/mpc8349_pci.h>
31 #ifdef CONFIG_83XX_GENERIC_PCI
34 DECLARE_GLOBAL_DATA_PTR
;
36 static struct pci_controller pci_hose
[MAX_BUSES
];
37 static int pci_num_buses
;
39 static void pci_init_bus(int bus
, struct pci_region
*reg
)
41 volatile immap_t
*immr
= (volatile immap_t
*)CFG_IMMR
;
42 volatile pot83xx_t
*pot
= immr
->ios
.pot
;
43 volatile pcictrl83xx_t
*pci_ctrl
= &immr
->pci_ctrl
[bus
];
44 struct pci_controller
*hose
= &pci_hose
[bus
];
52 /* Setup outbound translation windows */
53 for (i
= 0; i
< 3; i
++, reg
++, pot
++) {
57 hose
->regions
[i
] = *reg
;
60 pot
->potar
= reg
->bus_start
>> 12;
61 pot
->pobar
= reg
->phys_start
>> 12;
62 pot
->pocmr
= ~(reg
->size
- 1) >> 12;
64 if (reg
->flags
& PCI_REGION_IO
)
65 pot
->pocmr
|= POCMR_IO
;
66 #ifdef CONFIG_83XX_PCI_STREAMING
67 else if (reg
->flags
& PCI_REGION_PREFETCH
)
68 pot
->pocmr
|= POCMR_SE
;
72 pot
->pocmr
|= POCMR_DST
;
74 pot
->pocmr
|= POCMR_EN
;
77 /* Point inbound translation at RAM */
80 pci_ctrl
->piebar1
= 0;
81 pci_ctrl
->piwar1
= PIWAR_EN
| PIWAR_PF
| PIWAR_RTT_SNOOP
|
82 PIWAR_WTT_SNOOP
| (__ilog2(gd
->ram_size
) - 1);
84 i
= hose
->region_count
++;
85 hose
->regions
[i
].bus_start
= 0;
86 hose
->regions
[i
].phys_start
= 0;
87 hose
->regions
[i
].size
= gd
->ram_size
;
88 hose
->regions
[i
].flags
= PCI_REGION_MEM
| PCI_REGION_MEMORY
;
90 hose
->first_busno
= 0;
91 hose
->last_busno
= 0xff;
93 pci_setup_indirect(hose
, CFG_IMMR
+ 0x8300 + bus
* 0x80,
94 CFG_IMMR
+ 0x8304 + bus
* 0x80);
96 pci_register_hose(hose
);
99 * Write to Command register
102 dev
= PCI_BDF(hose
->first_busno
, 0, 0);
103 pci_hose_read_config_word(hose
, dev
, PCI_COMMAND
, ®16
);
104 reg16
|= PCI_COMMAND_SERR
| PCI_COMMAND_MASTER
| PCI_COMMAND_MEMORY
;
105 pci_hose_write_config_word(hose
, dev
, PCI_COMMAND
, reg16
);
108 * Clear non-reserved bits in status register.
110 pci_hose_write_config_word(hose
, dev
, PCI_STATUS
, 0xffff);
111 pci_hose_write_config_byte(hose
, dev
, PCI_LATENCY_TIMER
, 0x80);
112 pci_hose_write_config_byte(hose
, dev
, PCI_CACHE_LINE_SIZE
, 0x08);
114 #ifdef CONFIG_PCI_SCAN_SHOW
115 printf("PCI: Bus Dev VenId DevId Class Int\n");
120 hose
->last_busno
= pci_hose_scan(hose
);
124 * The caller must have already set OCCR, and the PCI_LAW BARs
125 * must have been set to cover all of the requested regions.
127 * If fewer than three regions are requested, then the region
128 * list is terminated with a region of size 0.
130 void mpc83xx_pci_init(int num_buses
, struct pci_region
**reg
, int warmboot
)
132 volatile immap_t
*immr
= (volatile immap_t
*)CFG_IMMR
;
135 if (num_buses
> MAX_BUSES
) {
136 printf("%d PCI buses requsted, %d supported\n",
137 num_buses
, MAX_BUSES
);
139 num_buses
= MAX_BUSES
;
142 pci_num_buses
= num_buses
;
145 * Release PCI RST Output signal.
146 * Power on to RST high must be at least 100 ms as per PCI spec.
147 * On warm boots only 1 ms is required.
149 udelay(warmboot
? 1000 : 100000);
151 for (i
= 0; i
< num_buses
; i
++)
152 immr
->pci_ctrl
[i
].gcr
= 1;
155 * RST high to first config access must be at least 2^25 cycles
156 * as per PCI spec. This could be cut in half if we know we're
157 * running at 66MHz. This could be insufficiently long if we're
158 * running the PCI bus at significantly less than 33MHz.
162 for (i
= 0; i
< num_buses
; i
++)
163 pci_init_bus(i
, reg
[i
]);
166 #ifdef CONFIG_OF_FLAT_TREE
167 void ft_pci_setup(void *blob
, bd_t
*bd
)
172 if (pci_num_buses
< 1)
175 p
= (u32
*)ft_get_prop(blob
, "/" OF_SOC
"/pci@8500/bus-range", &len
);
177 p
[0] = pci_hose
[0].first_busno
;
178 p
[1] = pci_hose
[0].last_busno
;
181 if (pci_num_buses
< 2)
184 p
= (u32
*)ft_get_prop(blob
, "/" OF_SOC
"/pci@8600/bus-range", &len
);
186 p
[0] = pci_hose
[1].first_busno
;
187 p
[1] = pci_hose
[1].last_busno
;
190 #endif /* CONFIG_OF_FLAT_TREE */
192 #endif /* CONFIG_83XX_GENERIC_PCI */