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1da177e4 LT |
1 | /* auxio.c: Probing for the Sparc AUXIO register at boot time. |
2 | * | |
3 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
4 | * | |
5 | * Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net) | |
6 | */ | |
7 | ||
dda9beb4 | 8 | #include <linux/module.h> |
1da177e4 LT |
9 | #include <linux/kernel.h> |
10 | #include <linux/init.h> | |
11 | #include <linux/ioport.h> | |
764f2579 | 12 | #include <linux/of_device.h> |
1da177e4 | 13 | |
f2ad06a2 | 14 | #include <asm/prom.h> |
1da177e4 | 15 | #include <asm/io.h> |
1da177e4 LT |
16 | #include <asm/auxio.h> |
17 | ||
1da177e4 | 18 | void __iomem *auxio_register = NULL; |
dda9beb4 | 19 | EXPORT_SYMBOL(auxio_register); |
1da177e4 LT |
20 | |
21 | enum auxio_type { | |
22 | AUXIO_TYPE_NODEV, | |
23 | AUXIO_TYPE_SBUS, | |
24 | AUXIO_TYPE_EBUS | |
25 | }; | |
26 | ||
27 | static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV; | |
28 | static DEFINE_SPINLOCK(auxio_lock); | |
29 | ||
30 | static void __auxio_sbus_set(u8 bits_on, u8 bits_off) | |
31 | { | |
32 | if (auxio_register) { | |
33 | unsigned char regval; | |
34 | unsigned long flags; | |
35 | unsigned char newval; | |
36 | ||
37 | spin_lock_irqsave(&auxio_lock, flags); | |
38 | ||
39 | regval = sbus_readb(auxio_register); | |
40 | newval = regval | bits_on; | |
41 | newval &= ~bits_off; | |
42 | newval &= ~AUXIO_AUX1_MASK; | |
43 | sbus_writeb(newval, auxio_register); | |
44 | ||
45 | spin_unlock_irqrestore(&auxio_lock, flags); | |
46 | } | |
47 | } | |
48 | ||
49 | static void __auxio_ebus_set(u8 bits_on, u8 bits_off) | |
50 | { | |
51 | if (auxio_register) { | |
52 | unsigned char regval; | |
53 | unsigned long flags; | |
54 | unsigned char newval; | |
55 | ||
56 | spin_lock_irqsave(&auxio_lock, flags); | |
57 | ||
58 | regval = (u8)readl(auxio_register); | |
59 | newval = regval | bits_on; | |
60 | newval &= ~bits_off; | |
61 | writel((u32)newval, auxio_register); | |
62 | ||
63 | spin_unlock_irqrestore(&auxio_lock, flags); | |
64 | } | |
65 | } | |
66 | ||
67 | static inline void __auxio_ebus_set_led(int on) | |
68 | { | |
69 | (on) ? __auxio_ebus_set(AUXIO_PCIO_LED, 0) : | |
70 | __auxio_ebus_set(0, AUXIO_PCIO_LED) ; | |
71 | } | |
72 | ||
73 | static inline void __auxio_sbus_set_led(int on) | |
74 | { | |
75 | (on) ? __auxio_sbus_set(AUXIO_AUX1_LED, 0) : | |
76 | __auxio_sbus_set(0, AUXIO_AUX1_LED) ; | |
77 | } | |
78 | ||
79 | void auxio_set_led(int on) | |
80 | { | |
81 | switch(auxio_devtype) { | |
82 | case AUXIO_TYPE_SBUS: | |
83 | __auxio_sbus_set_led(on); | |
84 | break; | |
85 | case AUXIO_TYPE_EBUS: | |
86 | __auxio_ebus_set_led(on); | |
87 | break; | |
88 | default: | |
89 | break; | |
90 | } | |
91 | } | |
92 | ||
93 | static inline void __auxio_sbus_set_lte(int on) | |
94 | { | |
95 | (on) ? __auxio_sbus_set(AUXIO_AUX1_LTE, 0) : | |
96 | __auxio_sbus_set(0, AUXIO_AUX1_LTE) ; | |
97 | } | |
98 | ||
99 | void auxio_set_lte(int on) | |
100 | { | |
101 | switch(auxio_devtype) { | |
102 | case AUXIO_TYPE_SBUS: | |
103 | __auxio_sbus_set_lte(on); | |
104 | break; | |
105 | case AUXIO_TYPE_EBUS: | |
106 | /* FALL-THROUGH */ | |
107 | default: | |
108 | break; | |
109 | } | |
110 | } | |
111 | ||
fd098316 | 112 | static struct of_device_id __initdata auxio_match[] = { |
b5ba0740 DM |
113 | { |
114 | .name = "auxio", | |
115 | }, | |
116 | {}, | |
117 | }; | |
118 | ||
119 | MODULE_DEVICE_TABLE(of, auxio_match); | |
120 | ||
36a59bd8 | 121 | static int __devinit auxio_probe(struct of_device *dev, const struct of_device_id *match) |
b5ba0740 | 122 | { |
36a59bd8 DM |
123 | struct device_node *dp = dev->node; |
124 | unsigned long size; | |
125 | ||
126 | if (!strcmp(dp->parent->name, "ebus")) { | |
127 | auxio_devtype = AUXIO_TYPE_EBUS; | |
128 | size = sizeof(u32); | |
129 | } else if (!strcmp(dp->parent->name, "sbus")) { | |
130 | auxio_devtype = AUXIO_TYPE_SBUS; | |
131 | size = 1; | |
132 | } else { | |
133 | printk("auxio: Unknown parent bus type [%s]\n", | |
134 | dp->parent->name); | |
b5ba0740 | 135 | return -ENODEV; |
36a59bd8 DM |
136 | } |
137 | auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio"); | |
b5ba0740 DM |
138 | if (!auxio_register) |
139 | return -ENODEV; | |
140 | ||
36a59bd8 DM |
141 | printk(KERN_INFO "AUXIO: Found device at %s\n", |
142 | dp->full_name); | |
b5ba0740 | 143 | |
36a59bd8 DM |
144 | if (auxio_devtype == AUXIO_TYPE_EBUS) |
145 | auxio_set_led(AUXIO_LED_ON); | |
b5ba0740 DM |
146 | |
147 | return 0; | |
148 | } | |
149 | ||
36a59bd8 | 150 | static struct of_platform_driver auxio_driver = { |
b5ba0740 | 151 | .match_table = auxio_match, |
36a59bd8 | 152 | .probe = auxio_probe, |
a2cd1558 SR |
153 | .driver = { |
154 | .name = "auxio", | |
155 | }, | |
b5ba0740 | 156 | }; |
b5ba0740 | 157 | |
36a59bd8 | 158 | static int __init auxio_init(void) |
b5ba0740 | 159 | { |
37b7754a | 160 | return of_register_driver(&auxio_driver, &of_platform_bus_type); |
1da177e4 | 161 | } |
b5ba0740 DM |
162 | |
163 | /* Must be after subsys_initcall() so that busses are probed. Must | |
164 | * be before device_initcall() because things like the floppy driver | |
165 | * need to use the AUXIO register. | |
166 | */ | |
36a59bd8 | 167 | fs_initcall(auxio_init); |