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Scott Wood49ea3b62007-04-16 14:34:21 -05001/*
2 * Copyright (C) Freescale Semiconductor, Inc. 2007
3 *
4 * Author: Scott Wood <scottwood@freescale.com>,
5 * with some bits from older board-specific PCI initialization.
6 *
7 * See file CREDITS for list of people who contributed to this
8 * project.
9 *
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.
14 *
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.
19 *
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,
23 * MA 02111-1307 USA
24 */
25
26#include <common.h>
27#include <pci.h>
Kim Phillips343d9102007-07-25 19:25:28 -050028
29#if defined(CONFIG_OF_LIBFDT)
30#include <libfdt.h>
Kim Phillips5b8bc602007-12-20 14:09:22 -060031#include <fdt_support.h>
Kim Phillips343d9102007-07-25 19:25:28 -050032#endif
33
Scott Wood49ea3b62007-04-16 14:34:21 -050034#include <asm/mpc8349_pci.h>
35
Scott Wood49ea3b62007-04-16 14:34:21 -050036#define MAX_BUSES 2
37
38DECLARE_GLOBAL_DATA_PTR;
39
40static struct pci_controller pci_hose[MAX_BUSES];
41static int pci_num_buses;
42
43static void pci_init_bus(int bus, struct pci_region *reg)
44{
45 volatile immap_t *immr = (volatile immap_t *)CFG_IMMR;
46 volatile pot83xx_t *pot = immr->ios.pot;
47 volatile pcictrl83xx_t *pci_ctrl = &immr->pci_ctrl[bus];
48 struct pci_controller *hose = &pci_hose[bus];
49 u32 dev;
50 u16 reg16;
51 int i;
52
53 if (bus == 1)
54 pot += 3;
55
56 /* Setup outbound translation windows */
57 for (i = 0; i < 3; i++, reg++, pot++) {
58 if (reg->size == 0)
59 break;
60
61 hose->regions[i] = *reg;
62 hose->region_count++;
63
64 pot->potar = reg->bus_start >> 12;
65 pot->pobar = reg->phys_start >> 12;
66 pot->pocmr = ~(reg->size - 1) >> 12;
67
68 if (reg->flags & PCI_REGION_IO)
69 pot->pocmr |= POCMR_IO;
70#ifdef CONFIG_83XX_PCI_STREAMING
71 else if (reg->flags & PCI_REGION_PREFETCH)
72 pot->pocmr |= POCMR_SE;
73#endif
74
75 if (bus == 1)
76 pot->pocmr |= POCMR_DST;
77
78 pot->pocmr |= POCMR_EN;
79 }
80
81 /* Point inbound translation at RAM */
82 pci_ctrl->pitar1 = 0;
83 pci_ctrl->pibar1 = 0;
84 pci_ctrl->piebar1 = 0;
85 pci_ctrl->piwar1 = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP |
86 PIWAR_WTT_SNOOP | (__ilog2(gd->ram_size) - 1);
87
88 i = hose->region_count++;
89 hose->regions[i].bus_start = 0;
90 hose->regions[i].phys_start = 0;
91 hose->regions[i].size = gd->ram_size;
92 hose->regions[i].flags = PCI_REGION_MEM | PCI_REGION_MEMORY;
93
94 hose->first_busno = 0;
95 hose->last_busno = 0xff;
96
97 pci_setup_indirect(hose, CFG_IMMR + 0x8300 + bus * 0x80,
98 CFG_IMMR + 0x8304 + bus * 0x80);
99
100 pci_register_hose(hose);
101
102 /*
103 * Write to Command register
104 */
105 reg16 = 0xff;
106 dev = PCI_BDF(hose->first_busno, 0, 0);
107 pci_hose_read_config_word(hose, dev, PCI_COMMAND, &reg16);
108 reg16 |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
109 pci_hose_write_config_word(hose, dev, PCI_COMMAND, reg16);
110
111 /*
112 * Clear non-reserved bits in status register.
113 */
114 pci_hose_write_config_word(hose, dev, PCI_STATUS, 0xffff);
115 pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
116 pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
117
118#ifdef CONFIG_PCI_SCAN_SHOW
119 printf("PCI: Bus Dev VenId DevId Class Int\n");
120#endif
121 /*
122 * Hose scan.
123 */
124 hose->last_busno = pci_hose_scan(hose);
125}
126
127/*
128 * The caller must have already set OCCR, and the PCI_LAW BARs
129 * must have been set to cover all of the requested regions.
130 *
131 * If fewer than three regions are requested, then the region
132 * list is terminated with a region of size 0.
133 */
134void mpc83xx_pci_init(int num_buses, struct pci_region **reg, int warmboot)
135{
136 volatile immap_t *immr = (volatile immap_t *)CFG_IMMR;
137 int i;
138
139 if (num_buses > MAX_BUSES) {
140 printf("%d PCI buses requsted, %d supported\n",
141 num_buses, MAX_BUSES);
142
143 num_buses = MAX_BUSES;
144 }
145
146 pci_num_buses = num_buses;
147
148 /*
149 * Release PCI RST Output signal.
150 * Power on to RST high must be at least 100 ms as per PCI spec.
151 * On warm boots only 1 ms is required.
152 */
153 udelay(warmboot ? 1000 : 100000);
154
155 for (i = 0; i < num_buses; i++)
156 immr->pci_ctrl[i].gcr = 1;
157
158 /*
159 * RST high to first config access must be at least 2^25 cycles
160 * as per PCI spec. This could be cut in half if we know we're
161 * running at 66MHz. This could be insufficiently long if we're
162 * running the PCI bus at significantly less than 33MHz.
163 */
164 udelay(1020000);
165
166 for (i = 0; i < num_buses; i++)
167 pci_init_bus(i, reg[i]);
168}
169
Kim Phillips343d9102007-07-25 19:25:28 -0500170#if defined(CONFIG_OF_LIBFDT)
171void ft_pci_setup(void *blob, bd_t *bd)
172{
173 int nodeoffset;
Kim Phillips343d9102007-07-25 19:25:28 -0500174 int tmp[2];
Kim Phillips5b8bc602007-12-20 14:09:22 -0600175 const char *path;
Kim Phillips343d9102007-07-25 19:25:28 -0500176
177 if (pci_num_buses < 1)
178 return;
179
Kim Phillips5b8bc602007-12-20 14:09:22 -0600180 nodeoffset = fdt_path_offset(blob, "/aliases");
Kim Phillips343d9102007-07-25 19:25:28 -0500181 if (nodeoffset >= 0) {
Kim Phillips5b8bc602007-12-20 14:09:22 -0600182 path = fdt_getprop(blob, nodeoffset, "pci0", NULL);
183 if (path) {
184 tmp[0] = cpu_to_be32(pci_hose[0].first_busno);
185 tmp[1] = cpu_to_be32(pci_hose[0].last_busno);
186 do_fixup_by_path(blob, path, "bus-range",
187 &tmp, sizeof(tmp), 1);
Kim Phillips3fde9e82007-08-15 22:30:33 -0500188
Kim Phillips5b8bc602007-12-20 14:09:22 -0600189 tmp[0] = cpu_to_be32(gd->pci_clk);
190 do_fixup_by_path(blob, path, "clock-frequency",
191 &tmp, sizeof(tmp[0]), 1);
192 }
Kim Phillips343d9102007-07-25 19:25:28 -0500193
Kim Phillips5b8bc602007-12-20 14:09:22 -0600194 if (pci_num_buses < 2)
195 return;
Kim Phillips343d9102007-07-25 19:25:28 -0500196
Kim Phillips5b8bc602007-12-20 14:09:22 -0600197 path = fdt_getprop(blob, nodeoffset, "pci1", NULL);
198 if (path) {
199 tmp[0] = cpu_to_be32(pci_hose[0].first_busno);
200 tmp[1] = cpu_to_be32(pci_hose[0].last_busno);
201 do_fixup_by_path(blob, path, "bus-range",
202 &tmp, sizeof(tmp), 1);
Kim Phillips3fde9e82007-08-15 22:30:33 -0500203
Kim Phillips5b8bc602007-12-20 14:09:22 -0600204 tmp[0] = cpu_to_be32(gd->pci_clk);
205 do_fixup_by_path(blob, path, "clock-frequency",
206 &tmp, sizeof(tmp[0]), 1);
207 }
Kim Phillips343d9102007-07-25 19:25:28 -0500208 }
209}
Kim Phillips5b8bc602007-12-20 14:09:22 -0600210#endif /* CONFIG_OF_LIBFDT */