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1 | /* |
2 | * Copyright (C) 2001,2002,2005 Broadcom Corporation | |
3 | * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org) | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; either version 2 | |
8 | * of the License, or (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | /* | |
21 | * BCM1x80/1x55-specific PCI support | |
22 | * | |
23 | * This module provides the glue between Linux's PCI subsystem | |
24 | * and the hardware. We basically provide glue for accessing | |
25 | * configuration space, and set up the translation for I/O | |
26 | * space accesses. | |
27 | * | |
28 | * To access configuration space, we use ioremap. In the 32-bit | |
29 | * kernel, this consumes either 4 or 8 page table pages, and 16MB of | |
30 | * kernel mapped memory. Hopefully neither of these should be a huge | |
31 | * problem. | |
32 | * | |
33 | * XXX: AT THIS TIME, ONLY the NATIVE PCI-X INTERFACE IS SUPPORTED. | |
34 | */ | |
35 | #include <linux/config.h> | |
36 | #include <linux/types.h> | |
37 | #include <linux/pci.h> | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/mm.h> | |
41 | #include <linux/console.h> | |
42 | #include <linux/tty.h> | |
43 | ||
44 | #include <asm/sibyte/bcm1480_regs.h> | |
45 | #include <asm/sibyte/bcm1480_scd.h> | |
46 | #include <asm/sibyte/board.h> | |
47 | #include <asm/io.h> | |
48 | ||
49 | /* | |
50 | * Macros for calculating offsets into config space given a device | |
51 | * structure or dev/fun/reg | |
52 | */ | |
53 | #define CFGOFFSET(bus,devfn,where) (((bus)<<16)+((devfn)<<8)+(where)) | |
54 | #define CFGADDR(bus,devfn,where) CFGOFFSET((bus)->number,(devfn),where) | |
55 | ||
56 | static void *cfg_space; | |
57 | ||
58 | #define PCI_BUS_ENABLED 1 | |
59 | #define LDT_BUS_ENABLED 2 | |
60 | #define PCI_DEVICE_MODE 4 | |
61 | ||
62 | static int bcm1480_bus_status = 0; | |
63 | ||
64 | #define PCI_BRIDGE_DEVICE 0 | |
65 | #define LDT_BRIDGE_DEVICE 1 | |
66 | ||
67 | /* | |
68 | * Read/write 32-bit values in config space. | |
69 | */ | |
70 | static inline u32 READCFG32(u32 addr) | |
71 | { | |
72 | return *(u32 *)(cfg_space + (addr&~3)); | |
73 | } | |
74 | ||
75 | static inline void WRITECFG32(u32 addr, u32 data) | |
76 | { | |
77 | *(u32 *)(cfg_space + (addr & ~3)) = data; | |
78 | } | |
79 | ||
80 | int pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin) | |
81 | { | |
82 | return dev->irq; | |
83 | } | |
84 | ||
85 | /* Do platform specific device initialization at pci_enable_device() time */ | |
86 | int pcibios_plat_dev_init(struct pci_dev *dev) | |
87 | { | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* | |
92 | * Some checks before doing config cycles: | |
93 | * In PCI Device Mode, hide everything on bus 0 except the LDT host | |
94 | * bridge. Otherwise, access is controlled by bridge MasterEn bits. | |
95 | */ | |
96 | static int bcm1480_pci_can_access(struct pci_bus *bus, int devfn) | |
97 | { | |
98 | if (!(bcm1480_bus_status & (PCI_BUS_ENABLED | PCI_DEVICE_MODE))) | |
99 | return 0; | |
100 | ||
101 | if (bus->number == 0) { | |
102 | if (bcm1480_bus_status & PCI_DEVICE_MODE) | |
103 | return 0; | |
104 | else | |
105 | return 1; | |
106 | } else | |
107 | return 1; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Read/write access functions for various sizes of values | |
112 | * in config space. Return all 1's for disallowed accesses | |
113 | * for a kludgy but adequate simulation of master aborts. | |
114 | */ | |
115 | ||
116 | static int bcm1480_pcibios_read(struct pci_bus *bus, unsigned int devfn, | |
117 | int where, int size, u32 * val) | |
118 | { | |
119 | u32 data = 0; | |
120 | ||
121 | if ((size == 2) && (where & 1)) | |
122 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
123 | else if ((size == 4) && (where & 3)) | |
124 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
125 | ||
126 | if (bcm1480_pci_can_access(bus, devfn)) | |
127 | data = READCFG32(CFGADDR(bus, devfn, where)); | |
128 | else | |
129 | data = 0xFFFFFFFF; | |
130 | ||
131 | if (size == 1) | |
132 | *val = (data >> ((where & 3) << 3)) & 0xff; | |
133 | else if (size == 2) | |
134 | *val = (data >> ((where & 3) << 3)) & 0xffff; | |
135 | else | |
136 | *val = data; | |
137 | ||
138 | return PCIBIOS_SUCCESSFUL; | |
139 | } | |
140 | ||
141 | static int bcm1480_pcibios_write(struct pci_bus *bus, unsigned int devfn, | |
142 | int where, int size, u32 val) | |
143 | { | |
144 | u32 cfgaddr = CFGADDR(bus, devfn, where); | |
145 | u32 data = 0; | |
146 | ||
147 | if ((size == 2) && (where & 1)) | |
148 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
149 | else if ((size == 4) && (where & 3)) | |
150 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
151 | ||
152 | if (!bcm1480_pci_can_access(bus, devfn)) | |
153 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
154 | ||
155 | data = READCFG32(cfgaddr); | |
156 | ||
157 | if (size == 1) | |
158 | data = (data & ~(0xff << ((where & 3) << 3))) | | |
159 | (val << ((where & 3) << 3)); | |
160 | else if (size == 2) | |
161 | data = (data & ~(0xffff << ((where & 3) << 3))) | | |
162 | (val << ((where & 3) << 3)); | |
163 | else | |
164 | data = val; | |
165 | ||
166 | WRITECFG32(cfgaddr, data); | |
167 | ||
168 | return PCIBIOS_SUCCESSFUL; | |
169 | } | |
170 | ||
171 | struct pci_ops bcm1480_pci_ops = { | |
172 | bcm1480_pcibios_read, | |
173 | bcm1480_pcibios_write, | |
174 | }; | |
175 | ||
176 | static struct resource bcm1480_mem_resource = { | |
177 | .name = "BCM1480 PCI MEM", | |
178 | .start = 0x40000000UL, | |
179 | .end = 0x5fffffffUL, | |
180 | .flags = IORESOURCE_MEM, | |
181 | }; | |
182 | ||
183 | static struct resource bcm1480_io_resource = { | |
184 | .name = "BCM1480 PCI I/O", | |
185 | .start = 0x00000000UL, | |
186 | .end = 0x01ffffffUL, | |
187 | .flags = IORESOURCE_IO, | |
188 | }; | |
189 | ||
190 | struct pci_controller bcm1480_controller = { | |
191 | .pci_ops = &bcm1480_pci_ops, | |
192 | .mem_resource = &bcm1480_mem_resource, | |
193 | .io_resource = &bcm1480_io_resource, | |
194 | }; | |
195 | ||
196 | ||
197 | static int __init bcm1480_pcibios_init(void) | |
198 | { | |
199 | uint32_t cmdreg; | |
200 | uint64_t reg; | |
201 | extern int pci_probe_only; | |
202 | ||
203 | /* CFE will assign PCI resources */ | |
204 | pci_probe_only = 1; | |
205 | ||
206 | /* Avoid ISA compat ranges. */ | |
207 | PCIBIOS_MIN_IO = 0x00008000UL; | |
208 | PCIBIOS_MIN_MEM = 0x01000000UL; | |
209 | ||
210 | /* Set I/O resource limits. */ | |
211 | ioport_resource.end = 0x01ffffffUL; /* 32MB accessible by bcm1480 */ | |
212 | iomem_resource.end = 0xffffffffUL; /* no HT support yet */ | |
213 | ||
214 | cfg_space = ioremap(A_BCM1480_PHYS_PCI_CFG_MATCH_BITS, 16*1024*1024); | |
215 | ||
216 | /* | |
217 | * See if the PCI bus has been configured by the firmware. | |
218 | */ | |
219 | reg = *((volatile uint64_t *) IOADDR(A_SCD_SYSTEM_CFG)); | |
220 | if (!(reg & M_BCM1480_SYS_PCI_HOST)) { | |
221 | bcm1480_bus_status |= PCI_DEVICE_MODE; | |
222 | } else { | |
223 | cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), | |
224 | PCI_COMMAND)); | |
225 | if (!(cmdreg & PCI_COMMAND_MASTER)) { | |
226 | printk | |
227 | ("PCI: Skipping PCI probe. Bus is not initialized.\n"); | |
228 | iounmap(cfg_space); | |
229 | return 1; /* XXX */ | |
230 | } | |
231 | bcm1480_bus_status |= PCI_BUS_ENABLED; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Establish mappings in KSEG2 (kernel virtual) to PCI I/O | |
236 | * space. Use "match bytes" policy to make everything look | |
237 | * little-endian. So, you need to also set | |
238 | * CONFIG_SWAP_IO_SPACE, but this is the combination that | |
239 | * works correctly with most of Linux's drivers. | |
240 | * XXX ehs: Should this happen in PCI Device mode? | |
241 | */ | |
242 | ||
243 | set_io_port_base((unsigned long) | |
244 | ioremap(A_BCM1480_PHYS_PCI_IO_MATCH_BYTES, 65536)); | |
245 | isa_slot_offset = (unsigned long) | |
246 | ioremap(A_BCM1480_PHYS_PCI_MEM_MATCH_BYTES, 1024*1024); | |
247 | ||
248 | register_pci_controller(&bcm1480_controller); | |
249 | ||
250 | #ifdef CONFIG_VGA_CONSOLE | |
251 | take_over_console(&vga_con,0,MAX_NR_CONSOLES-1,1); | |
252 | #endif | |
253 | return 0; | |
254 | } | |
255 | ||
256 | arch_initcall(bcm1480_pcibios_init); |