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 <asm/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
48static void __init ixdp2800_timer_init(void)
49{
50	ixp2000_init_time(50000000);
51}
52
53static struct sys_timer ixdp2800_timer = {
54	.init		= ixdp2800_timer_init,
55	.offset		= ixp2000_gettimeoffset,
56};
57
58/*************************************************************************
59 * IXDP2800 PCI
60 *************************************************************************/
61static void __init ixdp2800_slave_disable_pci_master(void)
62{
63	*IXP2000_PCI_CMDSTAT &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
64}
65
66static 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
93static 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
101void __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 */
146static 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}
154DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP2800, ixp2800_pci_fixup);
155
156static 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
165static 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
208static 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
221static 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
234static 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
240static 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
248struct __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
257int __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
280subsys_initcall(ixdp2800_pci_init);
281
282void __init ixdp2800_init_irq(void)
283{
284	ixdp2x00_init_irq(IXDP2800_CPLD_INT_STAT, IXDP2800_CPLD_INT_MASK, IXDP2800_NR_IRQS);
285}
286
287MACHINE_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,
296MACHINE_END
297