1 /*
2 * arch/arm/mach-ixp2000/ixdp2800.c
3 *
4 * IXDP2800 platform support
5 *
6 * Original Author: Jeffrey Daly <jeffrey.daly@intel.com>
7 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
8 *
9 * Copyright (C) 2002 Intel Corp.
10 * Copyright (C) 2003-2004 MontaVista Software, Inc.
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 */
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/mm.h>
20 #include <linux/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/device.h>
23 #include <linux/bitops.h>
24 #include <linux/pci.h>
25 #include <linux/ioport.h>
26 #include <linux/delay.h>
27 #include <linux/io.h>
28
29 #include <asm/irq.h>
30 #include <asm/pgtable.h>
31 #include <asm/page.h>
32 #include <asm/system.h>
33 #include <mach/hardware.h>
34 #include <asm/mach-types.h>
35
36 #include <asm/mach/pci.h>
37 #include <asm/mach/map.h>
38 #include <asm/mach/irq.h>
39 #include <asm/mach/time.h>
40 #include <asm/mach/flash.h>
41 #include <asm/mach/arch.h>
42
43 /*************************************************************************
44 * IXDP2800 timer tick
45 *************************************************************************/
46
ixdp2800_timer_init(void)47 static void __init ixdp2800_timer_init(void)
48 {
49 ixp2000_init_time(50000000);
50 }
51
52 static struct sys_timer ixdp2800_timer = {
53 .init = ixdp2800_timer_init,
54 .offset = ixp2000_gettimeoffset,
55 };
56
57 /*************************************************************************
58 * IXDP2800 PCI
59 *************************************************************************/
ixdp2800_slave_disable_pci_master(void)60 static void __init ixdp2800_slave_disable_pci_master(void)
61 {
62 *IXP2000_PCI_CMDSTAT &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
63 }
64
ixdp2800_master_wait_for_slave(void)65 static void __init ixdp2800_master_wait_for_slave(void)
66 {
67 volatile u32 *addr;
68
69 printk(KERN_INFO "IXDP2800: waiting for slave NPU to configure "
70 "its BAR sizes\n");
71
72 addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
73 PCI_BASE_ADDRESS_1);
74 do {
75 *addr = 0xffffffff;
76 cpu_relax();
77 } while (*addr != 0xfe000008);
78
79 addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
80 PCI_BASE_ADDRESS_2);
81 do {
82 *addr = 0xffffffff;
83 cpu_relax();
84 } while (*addr != 0xc0000008);
85
86 /*
87 * Configure the slave's SDRAM BAR by hand.
88 */
89 *addr = 0x40000008;
90 }
91
ixdp2800_slave_wait_for_master_enable(void)92 static void __init ixdp2800_slave_wait_for_master_enable(void)
93 {
94 printk(KERN_INFO "IXDP2800: waiting for master NPU to enable us\n");
95
96 while ((*IXP2000_PCI_CMDSTAT & PCI_COMMAND_MASTER) == 0)
97 cpu_relax();
98 }
99
ixdp2800_pci_preinit(void)100 void __init ixdp2800_pci_preinit(void)
101 {
102 printk("ixdp2x00_pci_preinit called\n");
103
104 *IXP2000_PCI_ADDR_EXT = 0x0001e000;
105
106 if (!ixdp2x00_master_npu())
107 ixdp2800_slave_disable_pci_master();
108
109 *IXP2000_PCI_SRAM_BASE_ADDR_MASK = (0x2000000 - 1) & ~0x3ffff;
110 *IXP2000_PCI_DRAM_BASE_ADDR_MASK = (0x40000000 - 1) & ~0xfffff;
111
112 ixp2000_pci_preinit();
113
114 if (ixdp2x00_master_npu()) {
115 /*
116 * Wait until the slave set its SRAM/SDRAM BAR sizes
117 * correctly before we proceed to scan and enumerate
118 * the bus.
119 */
120 ixdp2800_master_wait_for_slave();
121
122 /*
123 * We configure the SDRAM BARs by hand because they
124 * are 1G and fall outside of the regular allocated
125 * PCI address space.
126 */
127 *IXP2000_PCI_SDRAM_BAR = 0x00000008;
128 } else {
129 /*
130 * Wait for the master to complete scanning the bus
131 * and assigning resources before we proceed to scan
132 * the bus ourselves. Set pci=firmware to honor the
133 * master's resource assignment.
134 */
135 ixdp2800_slave_wait_for_master_enable();
136 pcibios_setup("firmware");
137 }
138 }
139
140 /*
141 * We assign the SDRAM BARs for the two IXP2800 CPUs by hand, outside
142 * of the regular PCI window, because there's only 512M of outbound PCI
143 * memory window on each IXP, while we need 1G for each of the BARs.
144 */
ixp2800_pci_fixup(struct pci_dev * dev)145 static void __devinit ixp2800_pci_fixup(struct pci_dev *dev)
146 {
147 if (machine_is_ixdp2800()) {
148 dev->resource[2].start = 0;
149 dev->resource[2].end = 0;
150 dev->resource[2].flags = 0;
151 }
152 }
153 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP2800, ixp2800_pci_fixup);
154
ixdp2800_pci_setup(int nr,struct pci_sys_data * sys)155 static int __init ixdp2800_pci_setup(int nr, struct pci_sys_data *sys)
156 {
157 sys->mem_offset = 0x00000000;
158
159 ixp2000_pci_setup(nr, sys);
160
161 return 1;
162 }
163
ixdp2800_pci_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)164 static int __init ixdp2800_pci_map_irq(const struct pci_dev *dev, u8 slot,
165 u8 pin)
166 {
167 if (ixdp2x00_master_npu()) {
168
169 /*
170 * Root bus devices. Slave NPU is only one with interrupt.
171 * Everything else, we just return -1 which is invalid.
172 */
173 if(!dev->bus->self) {
174 if(dev->devfn == IXDP2X00_SLAVE_NPU_DEVFN )
175 return IRQ_IXDP2800_INGRESS_NPU;
176
177 return -1;
178 }
179
180 /*
181 * Bridge behind the PMC slot.
182 */
183 if(dev->bus->self->devfn == IXDP2X00_PMC_DEVFN &&
184 dev->bus->parent->self->devfn == IXDP2X00_P2P_DEVFN &&
185 !dev->bus->parent->self->bus->parent)
186 return IRQ_IXDP2800_PMC;
187
188 /*
189 * Device behind the first bridge
190 */
191 if(dev->bus->self->devfn == IXDP2X00_P2P_DEVFN) {
192 switch(dev->devfn) {
193 case IXDP2X00_PMC_DEVFN:
194 return IRQ_IXDP2800_PMC;
195
196 case IXDP2800_MASTER_ENET_DEVFN:
197 return IRQ_IXDP2800_EGRESS_ENET;
198
199 case IXDP2800_SWITCH_FABRIC_DEVFN:
200 return IRQ_IXDP2800_FABRIC;
201 }
202 }
203
204 return -1;
205 } else return IRQ_IXP2000_PCIB; /* Slave NIC interrupt */
206 }
207
ixdp2800_master_enable_slave(void)208 static void __init ixdp2800_master_enable_slave(void)
209 {
210 volatile u32 *addr;
211
212 printk(KERN_INFO "IXDP2800: enabling slave NPU\n");
213
214 addr = (volatile u32 *)ixp2000_pci_config_addr(0,
215 IXDP2X00_SLAVE_NPU_DEVFN,
216 PCI_COMMAND);
217
218 *addr |= PCI_COMMAND_MASTER;
219 }
220
ixdp2800_master_wait_for_slave_bus_scan(void)221 static void __init ixdp2800_master_wait_for_slave_bus_scan(void)
222 {
223 volatile u32 *addr;
224
225 printk(KERN_INFO "IXDP2800: waiting for slave to finish bus scan\n");
226
227 addr = (volatile u32 *)ixp2000_pci_config_addr(0,
228 IXDP2X00_SLAVE_NPU_DEVFN,
229 PCI_COMMAND);
230 while ((*addr & PCI_COMMAND_MEMORY) == 0)
231 cpu_relax();
232 }
233
ixdp2800_slave_signal_bus_scan_completion(void)234 static void __init ixdp2800_slave_signal_bus_scan_completion(void)
235 {
236 printk(KERN_INFO "IXDP2800: bus scan done, signaling master\n");
237 *IXP2000_PCI_CMDSTAT |= PCI_COMMAND_MEMORY;
238 }
239
ixdp2800_pci_postinit(void)240 static void __init ixdp2800_pci_postinit(void)
241 {
242 if (!ixdp2x00_master_npu()) {
243 ixdp2x00_slave_pci_postinit();
244 ixdp2800_slave_signal_bus_scan_completion();
245 }
246 }
247
248 struct __initdata hw_pci ixdp2800_pci __initdata = {
249 .nr_controllers = 1,
250 .setup = ixdp2800_pci_setup,
251 .preinit = ixdp2800_pci_preinit,
252 .postinit = ixdp2800_pci_postinit,
253 .scan = ixp2000_pci_scan_bus,
254 .map_irq = ixdp2800_pci_map_irq,
255 };
256
ixdp2800_pci_init(void)257 int __init ixdp2800_pci_init(void)
258 {
259 if (machine_is_ixdp2800()) {
260 struct pci_dev *dev;
261
262 pci_common_init(&ixdp2800_pci);
263 if (ixdp2x00_master_npu()) {
264 dev = pci_get_bus_and_slot(1, IXDP2800_SLAVE_ENET_DEVFN);
265 pci_remove_bus_device(dev);
266 pci_dev_put(dev);
267
268 ixdp2800_master_enable_slave();
269 ixdp2800_master_wait_for_slave_bus_scan();
270 } else {
271 dev = pci_get_bus_and_slot(1, IXDP2800_MASTER_ENET_DEVFN);
272 pci_remove_bus_device(dev);
273 pci_dev_put(dev);
274 }
275 }
276
277 return 0;
278 }
279
280 subsys_initcall(ixdp2800_pci_init);
281
ixdp2800_init_irq(void)282 void __init ixdp2800_init_irq(void)
283 {
284 ixdp2x00_init_irq(IXDP2800_CPLD_INT_STAT, IXDP2800_CPLD_INT_MASK, IXDP2800_NR_IRQS);
285 }
286
287 MACHINE_START(IXDP2800, "Intel IXDP2800 Development Platform")
288 /* Maintainer: MontaVista Software, Inc. */
289 .atag_offset = 0x100,
290 .map_io = ixdp2x00_map_io,
291 .init_irq = ixdp2800_init_irq,
292 .timer = &ixdp2800_timer,
293 .init_machine = ixdp2x00_init_machine,
294 .restart = ixp2000_restart,
295 MACHINE_END
296
297