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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 | |
8 | #include <linux/module.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/init.h> |
11 | #include <linux/ioport.h> |
12 | #include <linux/of_device.h> |
13 | |
14 | #include <asm/prom.h> |
15 | #include <asm/io.h> |
16 | #include <asm/auxio.h> |
17 | |
18 | void __iomem *auxio_register = NULL; |
19 | EXPORT_SYMBOL(auxio_register); |
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_rmw(u8 bits_on, u8 bits_off, int ebus) |
31 | { |
32 | if (auxio_register) { |
33 | unsigned long flags; |
34 | u8 regval, newval; |
35 | |
36 | spin_lock_irqsave(&auxio_lock, flags); |
37 | |
38 | regval = (ebus ? |
39 | (u8) readl(auxio_register) : |
40 | sbus_readb(auxio_register)); |
41 | newval = regval | bits_on; |
42 | newval &= ~bits_off; |
43 | if (!ebus) |
44 | newval &= ~AUXIO_AUX1_MASK; |
45 | if (ebus) |
46 | writel((u32) newval, auxio_register); |
47 | else |
48 | sbus_writeb(newval, auxio_register); |
49 | |
50 | spin_unlock_irqrestore(&auxio_lock, flags); |
51 | } |
52 | } |
53 | |
54 | static void __auxio_set_bit(u8 bit, int on, int ebus) |
55 | { |
56 | u8 bits_on = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED); |
57 | u8 bits_off = 0; |
58 | |
59 | if (!on) { |
60 | u8 tmp = bits_off; |
61 | bits_off = bits_on; |
62 | bits_on = tmp; |
63 | } |
64 | __auxio_rmw(bits_on, bits_off, ebus); |
65 | } |
66 | |
67 | void auxio_set_led(int on) |
68 | { |
69 | int ebus = auxio_devtype == AUXIO_TYPE_EBUS; |
70 | u8 bit; |
71 | |
72 | bit = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED); |
73 | __auxio_set_bit(bit, on, ebus); |
74 | } |
75 | EXPORT_SYMBOL(auxio_set_led); |
76 | |
77 | static void __auxio_sbus_set_lte(int on) |
78 | { |
79 | __auxio_set_bit(AUXIO_AUX1_LTE, on, 0); |
80 | } |
81 | |
82 | void auxio_set_lte(int on) |
83 | { |
84 | switch(auxio_devtype) { |
85 | case AUXIO_TYPE_SBUS: |
86 | __auxio_sbus_set_lte(on); |
87 | break; |
88 | case AUXIO_TYPE_EBUS: |
89 | /* FALL-THROUGH */ |
90 | default: |
91 | break; |
92 | } |
93 | } |
94 | EXPORT_SYMBOL(auxio_set_lte); |
95 | |
96 | static struct of_device_id __initdata auxio_match[] = { |
97 | { |
98 | .name = "auxio", |
99 | }, |
100 | {}, |
101 | }; |
102 | |
103 | MODULE_DEVICE_TABLE(of, auxio_match); |
104 | |
105 | static int __devinit auxio_probe(struct platform_device *dev, |
106 | const struct of_device_id *match) |
107 | { |
108 | struct device_node *dp = dev->dev.of_node; |
109 | unsigned long size; |
110 | |
111 | if (!strcmp(dp->parent->name, "ebus")) { |
112 | auxio_devtype = AUXIO_TYPE_EBUS; |
113 | size = sizeof(u32); |
114 | } else if (!strcmp(dp->parent->name, "sbus")) { |
115 | auxio_devtype = AUXIO_TYPE_SBUS; |
116 | size = 1; |
117 | } else { |
118 | printk("auxio: Unknown parent bus type [%s]\n", |
119 | dp->parent->name); |
120 | return -ENODEV; |
121 | } |
122 | auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio"); |
123 | if (!auxio_register) |
124 | return -ENODEV; |
125 | |
126 | printk(KERN_INFO "AUXIO: Found device at %s\n", |
127 | dp->full_name); |
128 | |
129 | if (auxio_devtype == AUXIO_TYPE_EBUS) |
130 | auxio_set_led(AUXIO_LED_ON); |
131 | |
132 | return 0; |
133 | } |
134 | |
135 | static struct of_platform_driver auxio_driver = { |
136 | .probe = auxio_probe, |
137 | .driver = { |
138 | .name = "auxio", |
139 | .owner = THIS_MODULE, |
140 | .of_match_table = auxio_match, |
141 | }, |
142 | }; |
143 | |
144 | static int __init auxio_init(void) |
145 | { |
146 | return of_register_platform_driver(&auxio_driver); |
147 | } |
148 | |
149 | /* Must be after subsys_initcall() so that busses are probed. Must |
150 | * be before device_initcall() because things like the floppy driver |
151 | * need to use the AUXIO register. |
152 | */ |
153 | fs_initcall(auxio_init); |
154 |
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