1 /*
2  * Board setup routines for the Buffalo Linkstation / Kurobox Platform.
3  *
4  * Copyright (C) 2006 G. Liakhovetski (g.liakhovetski@gmx.de)
5  *
6  * Based on sandpoint.c by Mark A. Greer
7  *
8  * This file is licensed under the terms of the GNU General Public License
9  * version 2.  This program is licensed "as is" without any warranty of
10  * any kind, whether express or implied.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/initrd.h>
15 #include <linux/of_platform.h>
16 
17 #include <asm/time.h>
18 #include <asm/prom.h>
19 #include <asm/mpic.h>
20 #include <asm/pci-bridge.h>
21 
22 #include "mpc10x.h"
23 
24 static __initdata struct of_device_id of_bus_ids[] = {
25 	{ .type = "soc", },
26 	{ .compatible = "simple-bus", },
27 	{},
28 };
29 
30 static int __init declare_of_platform_devices(void)
31 {
32 	of_platform_bus_probe(NULL, of_bus_ids, NULL);
33 	return 0;
34 }
35 machine_device_initcall(linkstation, declare_of_platform_devices);
36 
37 static int __init linkstation_add_bridge(struct device_node *dev)
38 {
39 #ifdef CONFIG_PCI
40 	int len;
41 	struct pci_controller *hose;
42 	const int *bus_range;
43 
44 	printk("Adding PCI host bridge %s\n", dev->full_name);
45 
46 	bus_range = of_get_property(dev, "bus-range", &len);
47 	if (bus_range == NULL || len < 2 * sizeof(int))
48 		printk(KERN_WARNING "Can't get bus-range for %s, assume"
49 				" bus 0\n", dev->full_name);
50 
51 	hose = pcibios_alloc_controller(dev);
52 	if (hose == NULL)
53 		return -ENOMEM;
54 	hose->first_busno = bus_range ? bus_range[0] : 0;
55 	hose->last_busno = bus_range ? bus_range[1] : 0xff;
56 	setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
57 
58 	/* Interpret the "ranges" property */
59 	/* This also maps the I/O region and sets isa_io/mem_base */
60 	pci_process_bridge_OF_ranges(hose, dev, 1);
61 #endif
62 	return 0;
63 }
64 
65 static void __init linkstation_setup_arch(void)
66 {
67 	struct device_node *np;
68 
69 	/* Lookup PCI host bridges */
70 	for_each_compatible_node(np, "pci", "mpc10x-pci")
71 		linkstation_add_bridge(np);
72 
73 	printk(KERN_INFO "BUFFALO Network Attached Storage Series\n");
74 	printk(KERN_INFO "(C) 2002-2005 BUFFALO INC.\n");
75 }
76 
77 /*
78  * Interrupt setup and service.  Interrupts on the linkstation come
79  * from the four PCI slots plus onboard 8241 devices: I2C, DUART.
80  */
81 static void __init linkstation_init_IRQ(void)
82 {
83 	struct mpic *mpic;
84 
85 	mpic = mpic_alloc(NULL, 0, 0, 4, 0, " EPIC     ");
86 	BUG_ON(mpic == NULL);
87 
88 	/* PCI IRQs */
89 	mpic_assign_isu(mpic, 0, mpic->paddr + 0x10200);
90 
91 	/* I2C */
92 	mpic_assign_isu(mpic, 1, mpic->paddr + 0x11000);
93 
94 	/* ttyS0, ttyS1 */
95 	mpic_assign_isu(mpic, 2, mpic->paddr + 0x11100);
96 
97 	mpic_init(mpic);
98 }
99 
100 extern void avr_uart_configure(void);
101 extern void avr_uart_send(const char);
102 
103 static void linkstation_restart(char *cmd)
104 {
105 	local_irq_disable();
106 
107 	/* Reset system via AVR */
108 	avr_uart_configure();
109 	/* Send reboot command */
110 	avr_uart_send('C');
111 
112 	for(;;)  /* Spin until reset happens */
113 		avr_uart_send('G');	/* "kick" */
114 }
115 
116 static void linkstation_power_off(void)
117 {
118 	local_irq_disable();
119 
120 	/* Power down system via AVR */
121 	avr_uart_configure();
122 	/* send shutdown command */
123 	avr_uart_send('E');
124 
125 	for(;;)  /* Spin until power-off happens */
126 		avr_uart_send('G');	/* "kick" */
127 	/* NOTREACHED */
128 }
129 
130 static void linkstation_halt(void)
131 {
132 	linkstation_power_off();
133 	/* NOTREACHED */
134 }
135 
136 static void linkstation_show_cpuinfo(struct seq_file *m)
137 {
138 	seq_printf(m, "vendor\t\t: Buffalo Technology\n");
139 	seq_printf(m, "machine\t\t: Linkstation I/Kurobox(HG)\n");
140 }
141 
142 static int __init linkstation_probe(void)
143 {
144 	unsigned long root;
145 
146 	root = of_get_flat_dt_root();
147 
148 	if (!of_flat_dt_is_compatible(root, "linkstation"))
149 		return 0;
150 	return 1;
151 }
152 
153 define_machine(linkstation){
154 	.name 			= "Buffalo Linkstation",
155 	.probe 			= linkstation_probe,
156 	.setup_arch 		= linkstation_setup_arch,
157 	.init_IRQ 		= linkstation_init_IRQ,
158 	.show_cpuinfo 		= linkstation_show_cpuinfo,
159 	.get_irq 		= mpic_get_irq,
160 	.restart 		= linkstation_restart,
161 	.power_off 		= linkstation_power_off,
162 	.halt	 		= linkstation_halt,
163 	.calibrate_decr 	= generic_calibrate_decr,
164 };
165