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 #if defined(CONFIG_OF_LIBFDT)
31 #elif defined(CONFIG_OF_FLAT_TREE)
35 #include <asm/mpc8349_pci.h>
37 #ifdef CONFIG_83XX_GENERIC_PCI
40 DECLARE_GLOBAL_DATA_PTR;
42 static struct pci_controller pci_hose[MAX_BUSES];
43 static int pci_num_buses;
45 static void pci_init_bus(int bus, struct pci_region *reg)
47 volatile immap_t *immr = (volatile immap_t *)CFG_IMMR;
48 volatile pot83xx_t *pot = immr->ios.pot;
49 volatile pcictrl83xx_t *pci_ctrl = &immr->pci_ctrl[bus];
50 struct pci_controller *hose = &pci_hose[bus];
58 /* Setup outbound translation windows */
59 for (i = 0; i < 3; i++, reg++, pot++) {
63 hose->regions[i] = *reg;
66 pot->potar = reg->bus_start >> 12;
67 pot->pobar = reg->phys_start >> 12;
68 pot->pocmr = ~(reg->size - 1) >> 12;
70 if (reg->flags & PCI_REGION_IO)
71 pot->pocmr |= POCMR_IO;
72 #ifdef CONFIG_83XX_PCI_STREAMING
73 else if (reg->flags & PCI_REGION_PREFETCH)
74 pot->pocmr |= POCMR_SE;
78 pot->pocmr |= POCMR_DST;
80 pot->pocmr |= POCMR_EN;
83 /* Point inbound translation at RAM */
86 pci_ctrl->piebar1 = 0;
87 pci_ctrl->piwar1 = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP |
88 PIWAR_WTT_SNOOP | (__ilog2(gd->ram_size) - 1);
90 i = hose->region_count++;
91 hose->regions[i].bus_start = 0;
92 hose->regions[i].phys_start = 0;
93 hose->regions[i].size = gd->ram_size;
94 hose->regions[i].flags = PCI_REGION_MEM | PCI_REGION_MEMORY;
96 hose->first_busno = 0;
97 hose->last_busno = 0xff;
99 pci_setup_indirect(hose, CFG_IMMR + 0x8300 + bus * 0x80,
100 CFG_IMMR + 0x8304 + bus * 0x80);
102 pci_register_hose(hose);
105 * Write to Command register
108 dev = PCI_BDF(hose->first_busno, 0, 0);
109 pci_hose_read_config_word(hose, dev, PCI_COMMAND, ®16);
110 reg16 |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
111 pci_hose_write_config_word(hose, dev, PCI_COMMAND, reg16);
114 * Clear non-reserved bits in status register.
116 pci_hose_write_config_word(hose, dev, PCI_STATUS, 0xffff);
117 pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
118 pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
120 #ifdef CONFIG_PCI_SCAN_SHOW
121 printf("PCI: Bus Dev VenId DevId Class Int\n");
126 hose->last_busno = pci_hose_scan(hose);
130 * The caller must have already set OCCR, and the PCI_LAW BARs
131 * must have been set to cover all of the requested regions.
133 * If fewer than three regions are requested, then the region
134 * list is terminated with a region of size 0.
136 void mpc83xx_pci_init(int num_buses, struct pci_region **reg, int warmboot)
138 volatile immap_t *immr = (volatile immap_t *)CFG_IMMR;
141 if (num_buses > MAX_BUSES) {
142 printf("%d PCI buses requsted, %d supported\n",
143 num_buses, MAX_BUSES);
145 num_buses = MAX_BUSES;
148 pci_num_buses = num_buses;
151 * Release PCI RST Output signal.
152 * Power on to RST high must be at least 100 ms as per PCI spec.
153 * On warm boots only 1 ms is required.
155 udelay(warmboot ? 1000 : 100000);
157 for (i = 0; i < num_buses; i++)
158 immr->pci_ctrl[i].gcr = 1;
161 * RST high to first config access must be at least 2^25 cycles
162 * as per PCI spec. This could be cut in half if we know we're
163 * running at 66MHz. This could be insufficiently long if we're
164 * running the PCI bus at significantly less than 33MHz.
168 for (i = 0; i < num_buses; i++)
169 pci_init_bus(i, reg[i]);
172 #if defined(CONFIG_OF_LIBFDT)
173 void ft_pci_setup(void *blob, bd_t *bd)
179 if (pci_num_buses < 1)
182 nodeoffset = fdt_path_offset(blob, "/" OF_SOC "/pci@8500");
183 if (nodeoffset >= 0) {
184 tmp[0] = cpu_to_be32(pci_hose[0].first_busno);
185 tmp[1] = cpu_to_be32(pci_hose[0].last_busno);
186 err = fdt_setprop(blob, nodeoffset, "bus-range",
189 tmp[0] = cpu_to_be32(gd->pci_clk);
190 err = fdt_setprop(blob, nodeoffset, "clock-frequency",
191 tmp, sizeof(tmp[0]));
194 if (pci_num_buses < 2)
197 nodeoffset = fdt_path_offset(blob, "/" OF_SOC "/pci@8600");
198 if (nodeoffset >= 0) {
199 tmp[0] = cpu_to_be32(pci_hose[0].first_busno);
200 tmp[1] = cpu_to_be32(pci_hose[0].last_busno);
201 err = fdt_setprop(blob, nodeoffset, "bus-range",
204 tmp[0] = cpu_to_be32(gd->pci_clk);
205 err = fdt_setprop(blob, nodeoffset, "clock-frequency",
206 tmp, sizeof(tmp[0]));
209 #elif CONFIG_OF_FLAT_TREE
210 void ft_pci_setup(void *blob, bd_t *bd)
215 if (pci_num_buses < 1)
218 p = (u32 *)ft_get_prop(blob, "/" OF_SOC "/pci@8500/bus-range", &len);
220 p[0] = pci_hose[0].first_busno;
221 p[1] = pci_hose[0].last_busno;
224 if (pci_num_buses < 2)
227 p = (u32 *)ft_get_prop(blob, "/" OF_SOC "/pci@8600/bus-range", &len);
229 p[0] = pci_hose[1].first_busno;
230 p[1] = pci_hose[1].last_busno;
233 #endif /* CONFIG_OF_FLAT_TREE */
235 #endif /* CONFIG_83XX_GENERIC_PCI */