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-rw-r--r--arch/ppc/syslib/ppc405_pci.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/arch/ppc/syslib/ppc405_pci.c b/arch/ppc/syslib/ppc405_pci.c
new file mode 100644
index 000000000000..81c83bf98df4
--- /dev/null
+++ b/arch/ppc/syslib/ppc405_pci.c
@@ -0,0 +1,177 @@
1/*
2 * Authors: Frank Rowand <frank_rowand@mvista.com>,
3 * Debbie Chu <debbie_chu@mvista.com>, or source@mvista.com
4 * Further modifications by Armin Kuster <akuster@mvista.com>
5 *
6 * 2000 (c) MontaVista, Software, Inc. This file is licensed under
7 * the terms of the GNU General Public License version 2. This program
8 * is licensed "as is" without any warranty of any kind, whether express
9 * or implied.
10 *
11 * Based on arch/ppc/kernel/indirect.c, Copyright (C) 1998 Gabriel Paubert.
12 */
13
14#include <linux/pci.h>
15#include <asm/io.h>
16#include <asm/system.h>
17#include <asm/machdep.h>
18#include <linux/init.h>
19#include <linux/errno.h>
20#include <asm/ocp.h>
21#include <asm/ibm4xx.h>
22#include <asm/pci-bridge.h>
23#include <asm/ibm_ocp_pci.h>
24
25
26extern void bios_fixup(struct pci_controller *, struct pcil0_regs *);
27extern int ppc405_map_irq(struct pci_dev *dev, unsigned char idsel,
28 unsigned char pin);
29
30void
31ppc405_pcibios_fixup_resources(struct pci_dev *dev)
32{
33 int i;
34 unsigned long max_host_addr;
35 unsigned long min_host_addr;
36 struct resource *res;
37
38 /*
39 * openbios puts some graphics cards in the same range as the host
40 * controller uses to map to SDRAM. Fix it.
41 */
42
43 min_host_addr = 0;
44 max_host_addr = PPC405_PCI_MEM_BASE - 1;
45
46 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
47 res = dev->resource + i;
48 if (!res->start)
49 continue;
50 if ((res->flags & IORESOURCE_MEM) &&
51 (((res->start >= min_host_addr)
52 && (res->start <= max_host_addr))
53 || ((res->end >= min_host_addr)
54 && (res->end <= max_host_addr))
55 || ((res->start < min_host_addr)
56 && (res->end > max_host_addr))
57 )
58 ) {
59
60 /* force pcibios_assign_resources() to assign a new address */
61 res->end -= res->start;
62 res->start = 0;
63 }
64 }
65}
66
67static int
68ppc4xx_exclude_device(unsigned char bus, unsigned char devfn)
69{
70 /* We prevent us from seeing ourselves to avoid having
71 * the kernel try to remap our BAR #1 and fuck up bus
72 * master from external PCI devices
73 */
74 return (bus == 0 && devfn == 0);
75}
76
77void
78ppc4xx_find_bridges(void)
79{
80 struct pci_controller *hose_a;
81 struct pcil0_regs *pcip;
82 unsigned int tmp_addr;
83 unsigned int tmp_size;
84 unsigned int reg_index;
85 unsigned int new_pmm_max = 0;
86 unsigned int new_pmm_min = 0;
87
88 isa_io_base = 0;
89 isa_mem_base = 0;
90 pci_dram_offset = 0;
91
92#if (PSR_PCI_ARBIT_EN > 1)
93 /* Check if running in slave mode */
94 if ((mfdcr(DCRN_CHPSR) & PSR_PCI_ARBIT_EN) == 0) {
95 printk("Running as PCI slave, kernel PCI disabled !\n");
96 return;
97 }
98#endif
99 /* Setup PCI32 hose */
100 hose_a = pcibios_alloc_controller();
101 if (!hose_a)
102 return;
103 setup_indirect_pci(hose_a, PPC405_PCI_CONFIG_ADDR,
104 PPC405_PCI_CONFIG_DATA);
105
106 pcip = ioremap(PPC4xx_PCI_LCFG_PADDR, PAGE_SIZE);
107 if (pcip != NULL) {
108
109#if defined(CONFIG_BIOS_FIXUP)
110 bios_fixup(hose_a, pcip);
111#endif
112 new_pmm_min = 0xffffffff;
113 for (reg_index = 0; reg_index < 3; reg_index++) {
114 tmp_size = in_le32(&pcip->pmm[reg_index].ma); // mask & attrs
115 /* test the enable bit */
116 if ((tmp_size & 0x1) == 0)
117 continue;
118 tmp_addr = in_le32(&pcip->pmm[reg_index].pcila); // PCI addr
119 if (tmp_addr < PPC405_PCI_PHY_MEM_BASE) {
120 printk(KERN_DEBUG
121 "Disabling mapping to PCI mem addr 0x%8.8x\n",
122 tmp_addr);
123 out_le32(&pcip->pmm[reg_index].ma, tmp_size & ~1); // *_PMMOMA
124 continue;
125 }
126 tmp_addr = in_le32(&pcip->pmm[reg_index].la); // *_PMMOLA
127 if (tmp_addr < new_pmm_min)
128 new_pmm_min = tmp_addr;
129 tmp_addr = tmp_addr +
130 (0xffffffff - (tmp_size & 0xffffc000));
131 if (tmp_addr > PPC405_PCI_UPPER_MEM) {
132 new_pmm_max = tmp_addr; // PPC405_PCI_UPPER_MEM
133 } else {
134 new_pmm_max = PPC405_PCI_UPPER_MEM;
135 }
136
137 } // for
138
139 iounmap(pcip);
140 }
141
142 hose_a->first_busno = 0;
143 hose_a->last_busno = 0xff;
144 hose_a->pci_mem_offset = 0;
145
146 /* Setup bridge memory/IO ranges & resources
147 * TODO: Handle firmwares setting up a legacy ISA mem base
148 */
149 hose_a->io_space.start = PPC405_PCI_LOWER_IO;
150 hose_a->io_space.end = PPC405_PCI_UPPER_IO;
151 hose_a->mem_space.start = new_pmm_min;
152 hose_a->mem_space.end = new_pmm_max;
153 hose_a->io_base_phys = PPC405_PCI_PHY_IO_BASE;
154 hose_a->io_base_virt = ioremap(hose_a->io_base_phys, 0x10000);
155 hose_a->io_resource.start = 0;
156 hose_a->io_resource.end = PPC405_PCI_UPPER_IO - PPC405_PCI_LOWER_IO;
157 hose_a->io_resource.flags = IORESOURCE_IO;
158 hose_a->io_resource.name = "PCI I/O";
159 hose_a->mem_resources[0].start = new_pmm_min;
160 hose_a->mem_resources[0].end = new_pmm_max;
161 hose_a->mem_resources[0].flags = IORESOURCE_MEM;
162 hose_a->mem_resources[0].name = "PCI Memory";
163 isa_io_base = (int) hose_a->io_base_virt;
164 isa_mem_base = 0; /* ISA not implemented */
165 ISA_DMA_THRESHOLD = 0x00ffffff; /* ??? ISA not implemented */
166
167 /* Scan busses & initial setup by pci_auto */
168 hose_a->last_busno = pciauto_bus_scan(hose_a, hose_a->first_busno);
169 hose_a->last_busno = 0;
170
171 /* Setup ppc_md */
172 ppc_md.pcibios_fixup = NULL;
173 ppc_md.pci_exclude_device = ppc4xx_exclude_device;
174 ppc_md.pcibios_fixup_resources = ppc405_pcibios_fixup_resources;
175 ppc_md.pci_swizzle = common_swizzle;
176 ppc_md.pci_map_irq = ppc405_map_irq;
177}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-28 20:51:37 -0500