Merge commit 'v2.6.27-rc8' into genirq
[linux-2.6] / arch / arm / mach-ixp2000 / ixdp2800.c
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/slab.h>
27 #include <linux/delay.h>
28
29 #include <asm/io.h>
30 #include <asm/irq.h>
31 #include <asm/pgtable.h>
32 #include <asm/page.h>
33 #include <asm/system.h>
34 #include <mach/hardware.h>
35 #include <asm/mach-types.h>
36
37 #include <asm/mach/pci.h>
38 #include <asm/mach/map.h>
39 #include <asm/mach/irq.h>
40 #include <asm/mach/time.h>
41 #include <asm/mach/flash.h>
42 #include <asm/mach/arch.h>
43
44 /*************************************************************************
45  * IXDP2800 timer tick
46  *************************************************************************/
47
48 static void __init ixdp2800_timer_init(void)
49 {
50         ixp2000_init_time(50000000);
51 }
52
53 static struct sys_timer ixdp2800_timer = {
54         .init           = ixdp2800_timer_init,
55         .offset         = ixp2000_gettimeoffset,
56 };
57
58 /*************************************************************************
59  * IXDP2800 PCI
60  *************************************************************************/
61 static void __init ixdp2800_slave_disable_pci_master(void)
62 {
63         *IXP2000_PCI_CMDSTAT &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
64 }
65
66 static void __init ixdp2800_master_wait_for_slave(void)
67 {
68         volatile u32 *addr;
69
70         printk(KERN_INFO "IXDP2800: waiting for slave NPU to configure "
71                          "its BAR sizes\n");
72
73         addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
74                                         PCI_BASE_ADDRESS_1);
75         do {
76                 *addr = 0xffffffff;
77                 cpu_relax();
78         } while (*addr != 0xfe000008);
79
80         addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
81                                         PCI_BASE_ADDRESS_2);
82         do {
83                 *addr = 0xffffffff;
84                 cpu_relax();
85         } while (*addr != 0xc0000008);
86
87         /*
88          * Configure the slave's SDRAM BAR by hand.
89          */
90         *addr = 0x40000008;
91 }
92
93 static void __init ixdp2800_slave_wait_for_master_enable(void)
94 {
95         printk(KERN_INFO "IXDP2800: waiting for master NPU to enable us\n");
96
97         while ((*IXP2000_PCI_CMDSTAT & PCI_COMMAND_MASTER) == 0)
98                 cpu_relax();
99 }
100
101 void __init ixdp2800_pci_preinit(void)
102 {
103         printk("ixdp2x00_pci_preinit called\n");
104
105         *IXP2000_PCI_ADDR_EXT = 0x0001e000;
106
107         if (!ixdp2x00_master_npu())
108                 ixdp2800_slave_disable_pci_master();
109
110         *IXP2000_PCI_SRAM_BASE_ADDR_MASK = (0x2000000 - 1) & ~0x3ffff;
111         *IXP2000_PCI_DRAM_BASE_ADDR_MASK = (0x40000000 - 1) & ~0xfffff;
112
113         ixp2000_pci_preinit();
114
115         if (ixdp2x00_master_npu()) {
116                 /*
117                  * Wait until the slave set its SRAM/SDRAM BAR sizes
118                  * correctly before we proceed to scan and enumerate
119                  * the bus.
120                  */
121                 ixdp2800_master_wait_for_slave();
122
123                 /*
124                  * We configure the SDRAM BARs by hand because they
125                  * are 1G and fall outside of the regular allocated
126                  * PCI address space.
127                  */
128                 *IXP2000_PCI_SDRAM_BAR = 0x00000008;
129         } else {
130                 /*
131                  * Wait for the master to complete scanning the bus
132                  * and assigning resources before we proceed to scan
133                  * the bus ourselves.  Set pci=firmware to honor the
134                  * master's resource assignment.
135                  */
136                 ixdp2800_slave_wait_for_master_enable();
137                 pcibios_setup("firmware");
138         }
139 }
140
141 /*
142  * We assign the SDRAM BARs for the two IXP2800 CPUs by hand, outside
143  * of the regular PCI window, because there's only 512M of outbound PCI
144  * memory window on each IXP, while we need 1G for each of the BARs.
145  */
146 static void __devinit ixp2800_pci_fixup(struct pci_dev *dev)
147 {
148         if (machine_is_ixdp2800()) {
149                 dev->resource[2].start = 0;
150                 dev->resource[2].end   = 0;
151                 dev->resource[2].flags = 0;
152         }
153 }
154 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP2800, ixp2800_pci_fixup);
155
156 static int __init ixdp2800_pci_setup(int nr, struct pci_sys_data *sys)
157 {
158         sys->mem_offset = 0x00000000;
159
160         ixp2000_pci_setup(nr, sys);
161
162         return 1;
163 }
164
165 static int __init ixdp2800_pci_map_irq(struct pci_dev *dev, u8 slot, 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
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
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
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
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
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
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         .phys_io        = IXP2000_UART_PHYS_BASE,
290         .io_pg_offst    = ((IXP2000_UART_VIRT_BASE) >> 18) & 0xfffc,
291         .boot_params    = 0x00000100,
292         .map_io         = ixdp2x00_map_io,
293         .init_irq       = ixdp2800_init_irq,
294         .timer          = &ixdp2800_timer,
295         .init_machine   = ixdp2x00_init_machine,
296 MACHINE_END
297