Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm...
[linux-2.6.git] / 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/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 <mach/hardware.h>
33 #include <asm/mach-types.h>
34
35 #include <asm/mach/pci.h>
36 #include <asm/mach/map.h>
37 #include <asm/mach/irq.h>
38 #include <asm/mach/time.h>
39 #include <asm/mach/flash.h>
40 #include <asm/mach/arch.h>
41
42 /*************************************************************************
43  * IXDP2800 timer tick
44  *************************************************************************/
45
46 static void __init ixdp2800_timer_init(void)
47 {
48         ixp2000_init_time(50000000);
49 }
50
51 static struct sys_timer ixdp2800_timer = {
52         .init           = ixdp2800_timer_init,
53         .offset         = ixp2000_gettimeoffset,
54 };
55
56 /*************************************************************************
57  * IXDP2800 PCI
58  *************************************************************************/
59 static void __init ixdp2800_slave_disable_pci_master(void)
60 {
61         *IXP2000_PCI_CMDSTAT &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
62 }
63
64 static void __init ixdp2800_master_wait_for_slave(void)
65 {
66         volatile u32 *addr;
67
68         printk(KERN_INFO "IXDP2800: waiting for slave NPU to configure "
69                          "its BAR sizes\n");
70
71         addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
72                                         PCI_BASE_ADDRESS_1);
73         do {
74                 *addr = 0xffffffff;
75                 cpu_relax();
76         } while (*addr != 0xfe000008);
77
78         addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
79                                         PCI_BASE_ADDRESS_2);
80         do {
81                 *addr = 0xffffffff;
82                 cpu_relax();
83         } while (*addr != 0xc0000008);
84
85         /*
86          * Configure the slave's SDRAM BAR by hand.
87          */
88         *addr = 0x40000008;
89 }
90
91 static void __init ixdp2800_slave_wait_for_master_enable(void)
92 {
93         printk(KERN_INFO "IXDP2800: waiting for master NPU to enable us\n");
94
95         while ((*IXP2000_PCI_CMDSTAT & PCI_COMMAND_MASTER) == 0)
96                 cpu_relax();
97 }
98
99 void __init ixdp2800_pci_preinit(void)
100 {
101         printk("ixdp2x00_pci_preinit called\n");
102
103         *IXP2000_PCI_ADDR_EXT = 0x0001e000;
104
105         if (!ixdp2x00_master_npu())
106                 ixdp2800_slave_disable_pci_master();
107
108         *IXP2000_PCI_SRAM_BASE_ADDR_MASK = (0x2000000 - 1) & ~0x3ffff;
109         *IXP2000_PCI_DRAM_BASE_ADDR_MASK = (0x40000000 - 1) & ~0xfffff;
110
111         ixp2000_pci_preinit();
112
113         if (ixdp2x00_master_npu()) {
114                 /*
115                  * Wait until the slave set its SRAM/SDRAM BAR sizes
116                  * correctly before we proceed to scan and enumerate
117                  * the bus.
118                  */
119                 ixdp2800_master_wait_for_slave();
120
121                 /*
122                  * We configure the SDRAM BARs by hand because they
123                  * are 1G and fall outside of the regular allocated
124                  * PCI address space.
125                  */
126                 *IXP2000_PCI_SDRAM_BAR = 0x00000008;
127         } else {
128                 /*
129                  * Wait for the master to complete scanning the bus
130                  * and assigning resources before we proceed to scan
131                  * the bus ourselves.  Set pci=firmware to honor the
132                  * master's resource assignment.
133                  */
134                 ixdp2800_slave_wait_for_master_enable();
135                 pcibios_setup("firmware");
136         }
137 }
138
139 /*
140  * We assign the SDRAM BARs for the two IXP2800 CPUs by hand, outside
141  * of the regular PCI window, because there's only 512M of outbound PCI
142  * memory window on each IXP, while we need 1G for each of the BARs.
143  */
144 static void __devinit ixp2800_pci_fixup(struct pci_dev *dev)
145 {
146         if (machine_is_ixdp2800()) {
147                 dev->resource[2].start = 0;
148                 dev->resource[2].end   = 0;
149                 dev->resource[2].flags = 0;
150         }
151 }
152 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP2800, ixp2800_pci_fixup);
153
154 static int __init ixdp2800_pci_setup(int nr, struct pci_sys_data *sys)
155 {
156         sys->mem_offset = 0x00000000;
157
158         ixp2000_pci_setup(nr, sys);
159
160         return 1;
161 }
162
163 static int __init ixdp2800_pci_map_irq(const struct pci_dev *dev, u8 slot,
164         u8 pin)
165 {
166         if (ixdp2x00_master_npu()) {
167
168                 /*
169                  * Root bus devices.  Slave NPU is only one with interrupt.
170                  * Everything else, we just return -1 which is invalid.
171                  */
172                 if(!dev->bus->self) {
173                         if(dev->devfn == IXDP2X00_SLAVE_NPU_DEVFN )
174                                 return IRQ_IXDP2800_INGRESS_NPU;
175
176                         return -1;
177                 }
178
179                 /*
180                  * Bridge behind the PMC slot.
181                  */
182                 if(dev->bus->self->devfn == IXDP2X00_PMC_DEVFN &&
183                         dev->bus->parent->self->devfn == IXDP2X00_P2P_DEVFN &&
184                         !dev->bus->parent->self->bus->parent)
185                                   return IRQ_IXDP2800_PMC;
186
187                 /*
188                  * Device behind the first bridge
189                  */
190                 if(dev->bus->self->devfn == IXDP2X00_P2P_DEVFN) {
191                         switch(dev->devfn) {
192                                 case IXDP2X00_PMC_DEVFN:
193                                         return IRQ_IXDP2800_PMC;        
194                         
195                                 case IXDP2800_MASTER_ENET_DEVFN:
196                                         return IRQ_IXDP2800_EGRESS_ENET;
197
198                                 case IXDP2800_SWITCH_FABRIC_DEVFN:
199                                         return IRQ_IXDP2800_FABRIC;
200                         }
201                 }
202
203                 return -1;
204         } else return IRQ_IXP2000_PCIB; /* Slave NIC interrupt */
205 }
206
207 static void __init ixdp2800_master_enable_slave(void)
208 {
209         volatile u32 *addr;
210
211         printk(KERN_INFO "IXDP2800: enabling slave NPU\n");
212
213         addr = (volatile u32 *)ixp2000_pci_config_addr(0,
214                                         IXDP2X00_SLAVE_NPU_DEVFN,
215                                         PCI_COMMAND);
216
217         *addr |= PCI_COMMAND_MASTER;
218 }
219
220 static void __init ixdp2800_master_wait_for_slave_bus_scan(void)
221 {
222         volatile u32 *addr;
223
224         printk(KERN_INFO "IXDP2800: waiting for slave to finish bus scan\n");
225
226         addr = (volatile u32 *)ixp2000_pci_config_addr(0,
227                                         IXDP2X00_SLAVE_NPU_DEVFN,
228                                         PCI_COMMAND);
229         while ((*addr & PCI_COMMAND_MEMORY) == 0)
230                 cpu_relax();
231 }
232
233 static void __init ixdp2800_slave_signal_bus_scan_completion(void)
234 {
235         printk(KERN_INFO "IXDP2800: bus scan done, signaling master\n");
236         *IXP2000_PCI_CMDSTAT |= PCI_COMMAND_MEMORY;
237 }
238
239 static void __init ixdp2800_pci_postinit(void)
240 {
241         if (!ixdp2x00_master_npu()) {
242                 ixdp2x00_slave_pci_postinit();
243                 ixdp2800_slave_signal_bus_scan_completion();
244         }
245 }
246
247 struct __initdata hw_pci ixdp2800_pci __initdata = {
248         .nr_controllers = 1,
249         .setup          = ixdp2800_pci_setup,
250         .preinit        = ixdp2800_pci_preinit,
251         .postinit       = ixdp2800_pci_postinit,
252         .scan           = ixp2000_pci_scan_bus,
253         .map_irq        = ixdp2800_pci_map_irq,
254 };
255
256 int __init ixdp2800_pci_init(void)
257 {
258         if (machine_is_ixdp2800()) {
259                 struct pci_dev *dev;
260
261                 pci_common_init(&ixdp2800_pci);
262                 if (ixdp2x00_master_npu()) {
263                         dev = pci_get_bus_and_slot(1, IXDP2800_SLAVE_ENET_DEVFN);
264                         pci_stop_and_remove_bus_device(dev);
265                         pci_dev_put(dev);
266
267                         ixdp2800_master_enable_slave();
268                         ixdp2800_master_wait_for_slave_bus_scan();
269                 } else {
270                         dev = pci_get_bus_and_slot(1, IXDP2800_MASTER_ENET_DEVFN);
271                         pci_stop_and_remove_bus_device(dev);
272                         pci_dev_put(dev);
273                 }
274         }
275
276         return 0;
277 }
278
279 subsys_initcall(ixdp2800_pci_init);
280
281 void __init ixdp2800_init_irq(void)
282 {
283         ixdp2x00_init_irq(IXDP2800_CPLD_INT_STAT, IXDP2800_CPLD_INT_MASK, IXDP2800_NR_IRQS);
284 }
285
286 MACHINE_START(IXDP2800, "Intel IXDP2800 Development Platform")
287         /* Maintainer: MontaVista Software, Inc. */
288         .atag_offset    = 0x100,
289         .map_io         = ixdp2x00_map_io,
290         .init_irq       = ixdp2800_init_irq,
291         .timer          = &ixdp2800_timer,
292         .init_machine   = ixdp2x00_init_machine,
293         .restart        = ixp2000_restart,
294 MACHINE_END
295