Powerpc/i2c: Use the same initialize codes
[oweals/u-boot.git] / drivers / pci / tsi108_pci.c
1 /*
2  * (C) Copyright 2004 Tundra Semiconductor Corp.
3  * Alex Bounine <alexandreb@tundra.com>
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23
24 /*
25  * PCI initialisation for the Tsi108 EMU board.
26  */
27
28 #include <config.h>
29
30 #include <common.h>
31 #include <pci.h>
32 #include <asm/io.h>
33 #include <tsi108.h>
34 #if defined(CONFIG_OF_LIBFDT)
35 #include <libfdt.h>
36 #include <fdt_support.h>
37 #endif
38
39 struct pci_controller local_hose;
40
41 void tsi108_clear_pci_error (void)
42 {
43         u32 err_stat, err_addr, pci_stat;
44
45         /*
46          * Quietly clear errors signalled as result of PCI/X configuration read
47          * requests.
48          */
49         /* Read PB Error Log Registers */
50         err_stat = *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
51                                      TSI108_PB_REG_OFFSET + PB_ERRCS);
52         err_addr = *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
53                                      TSI108_PB_REG_OFFSET + PB_AERR);
54         if (err_stat & PB_ERRCS_ES) {
55                 /* Clear PCI/X bus errors if applicable */
56                 if ((err_addr & 0xFF000000) == CONFIG_SYS_PCI_CFG_BASE) {
57                         /* Clear error flag */
58                         *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE +
59                                   TSI108_PB_REG_OFFSET + PB_ERRCS) =
60                             PB_ERRCS_ES;
61
62                         /* Clear read error reported in PB_ISR */
63                         *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE +
64                                   TSI108_PB_REG_OFFSET + PB_ISR) =
65                             PB_ISR_PBS_RD_ERR;
66
67                 /* Clear errors reported by PCI CSR (Normally Master Abort) */
68                         pci_stat = *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
69                                                      TSI108_PCI_REG_OFFSET +
70                                                      PCI_CSR);
71                         *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
72                                           TSI108_PCI_REG_OFFSET + PCI_CSR) =
73                             pci_stat;
74
75                         *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
76                                           TSI108_PCI_REG_OFFSET +
77                                           PCI_IRP_STAT) = PCI_IRP_STAT_P_CSR;
78                 }
79         }
80
81         return;
82 }
83
84 unsigned int __get_pci_config_dword (u32 addr)
85 {
86         unsigned int retval;
87
88         __asm__ __volatile__ ("       lwbrx %0,0,%1\n"
89                              "1:     eieio\n"
90                              "2:\n"
91                              ".section .fixup,\"ax\"\n"
92                              "3:     li %0,-1\n"
93                              "       b 2b\n"
94                              ".section __ex_table,\"a\"\n"
95                              "       .align 2\n"
96                              "       .long 1b,3b\n"
97                              ".section .text.__get_pci_config_dword"
98                                 : "=r"(retval) : "r"(addr));
99
100         return (retval);
101 }
102
103 static int tsi108_read_config_dword (struct pci_controller *hose,
104                                     pci_dev_t dev, int offset, u32 * value)
105 {
106         dev &= (CONFIG_SYS_PCI_CFG_SIZE - 1);
107         dev |= (CONFIG_SYS_PCI_CFG_BASE | (offset & 0xfc));
108         *value = __get_pci_config_dword(dev);
109         if (0xFFFFFFFF == *value)
110                 tsi108_clear_pci_error ();
111         return 0;
112 }
113
114 static int tsi108_write_config_dword (struct pci_controller *hose,
115                                      pci_dev_t dev, int offset, u32 value)
116 {
117         dev &= (CONFIG_SYS_PCI_CFG_SIZE - 1);
118         dev |= (CONFIG_SYS_PCI_CFG_BASE | (offset & 0xfc));
119
120         out_le32 ((volatile unsigned *)dev, value);
121
122         return 0;
123 }
124
125 void pci_init_board (void)
126 {
127         struct pci_controller *hose = (struct pci_controller *)&local_hose;
128
129         hose->first_busno = 0;
130         hose->last_busno = 0xff;
131
132         pci_set_region (hose->regions + 0,
133                        CONFIG_SYS_PCI_MEMORY_BUS,
134                        CONFIG_SYS_PCI_MEMORY_PHYS,
135                        CONFIG_SYS_PCI_MEMORY_SIZE, PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
136
137         /* PCI memory space */
138         pci_set_region (hose->regions + 1,
139                        CONFIG_SYS_PCI_MEM_BUS,
140                        CONFIG_SYS_PCI_MEM_PHYS, CONFIG_SYS_PCI_MEM_SIZE, PCI_REGION_MEM);
141
142         /* PCI I/O space */
143         pci_set_region (hose->regions + 2,
144                        CONFIG_SYS_PCI_IO_BUS,
145                        CONFIG_SYS_PCI_IO_PHYS, CONFIG_SYS_PCI_IO_SIZE, PCI_REGION_IO);
146
147         hose->region_count = 3;
148
149         pci_set_ops (hose,
150                     pci_hose_read_config_byte_via_dword,
151                     pci_hose_read_config_word_via_dword,
152                     tsi108_read_config_dword,
153                     pci_hose_write_config_byte_via_dword,
154                     pci_hose_write_config_word_via_dword,
155                     tsi108_write_config_dword);
156
157         pci_register_hose (hose);
158
159         hose->last_busno = pci_hose_scan (hose);
160
161         debug ("Done PCI initialization\n");
162         return;
163 }
164
165 #if defined(CONFIG_OF_LIBFDT)
166 void ft_pci_setup(void *blob, bd_t *bd)
167 {
168         int nodeoffset;
169         int tmp[2];
170         const char *path;
171
172         nodeoffset = fdt_path_offset(blob, "/aliases");
173         if (nodeoffset >= 0) {
174                 path = fdt_getprop(blob, nodeoffset, "pci", NULL);
175                 if (path) {
176                         tmp[0] = cpu_to_be32(local_hose.first_busno);
177                         tmp[1] = cpu_to_be32(local_hose.last_busno);
178                         do_fixup_by_path(blob, path, "bus-range",
179                                 &tmp, sizeof(tmp), 1);
180                 }
181         }
182 }
183 #endif /* CONFIG_OF_LIBFDT */