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 const struct of_device_id of_bus_ids[] __initconst = {
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 %pOF\n", dev);
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 %pOF, assume"
49 				" bus 0\n", dev);
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 	printk(KERN_INFO "BUFFALO Network Attached Storage Series\n");
68 	printk(KERN_INFO "(C) 2002-2005 BUFFALO INC.\n");
69 }
70 
71 static void __init linkstation_setup_pci(void)
72 {
73 	struct device_node *np;
74 
75 	/* Lookup PCI host bridges */
76 	for_each_compatible_node(np, "pci", "mpc10x-pci")
77 		linkstation_add_bridge(np);
78 }
79 
80 /*
81  * Interrupt setup and service.  Interrupts on the linkstation come
82  * from the four PCI slots plus onboard 8241 devices: I2C, DUART.
83  */
84 static void __init linkstation_init_IRQ(void)
85 {
86 	struct mpic *mpic;
87 
88 	mpic = mpic_alloc(NULL, 0, 0, 4, 0, " EPIC     ");
89 	BUG_ON(mpic == NULL);
90 
91 	/* PCI IRQs */
92 	mpic_assign_isu(mpic, 0, mpic->paddr + 0x10200);
93 
94 	/* I2C */
95 	mpic_assign_isu(mpic, 1, mpic->paddr + 0x11000);
96 
97 	/* ttyS0, ttyS1 */
98 	mpic_assign_isu(mpic, 2, mpic->paddr + 0x11100);
99 
100 	mpic_init(mpic);
101 }
102 
103 extern void avr_uart_configure(void);
104 extern void avr_uart_send(const char);
105 
106 static void __noreturn linkstation_restart(char *cmd)
107 {
108 	local_irq_disable();
109 
110 	/* Reset system via AVR */
111 	avr_uart_configure();
112 	/* Send reboot command */
113 	avr_uart_send('C');
114 
115 	for(;;)  /* Spin until reset happens */
116 		avr_uart_send('G');	/* "kick" */
117 }
118 
119 static void __noreturn linkstation_power_off(void)
120 {
121 	local_irq_disable();
122 
123 	/* Power down system via AVR */
124 	avr_uart_configure();
125 	/* send shutdown command */
126 	avr_uart_send('E');
127 
128 	for(;;)  /* Spin until power-off happens */
129 		avr_uart_send('G');	/* "kick" */
130 	/* NOTREACHED */
131 }
132 
133 static void __noreturn linkstation_halt(void)
134 {
135 	linkstation_power_off();
136 	/* NOTREACHED */
137 }
138 
139 static void linkstation_show_cpuinfo(struct seq_file *m)
140 {
141 	seq_printf(m, "vendor\t\t: Buffalo Technology\n");
142 	seq_printf(m, "machine\t\t: Linkstation I/Kurobox(HG)\n");
143 }
144 
145 static int __init linkstation_probe(void)
146 {
147 	if (!of_machine_is_compatible("linkstation"))
148 		return 0;
149 
150 	pm_power_off = linkstation_power_off;
151 
152 	return 1;
153 }
154 
155 define_machine(linkstation){
156 	.name 			= "Buffalo Linkstation",
157 	.probe 			= linkstation_probe,
158 	.setup_arch 		= linkstation_setup_arch,
159 	.discover_phbs		= linkstation_setup_pci,
160 	.init_IRQ 		= linkstation_init_IRQ,
161 	.show_cpuinfo 		= linkstation_show_cpuinfo,
162 	.get_irq 		= mpic_get_irq,
163 	.restart 		= linkstation_restart,
164 	.halt	 		= linkstation_halt,
165 	.calibrate_decr 	= generic_calibrate_decr,
166 };
167