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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* auxio.c: Probing for the Sparc AUXIO register at boot time. |
3 | * | |
4 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
5 | * | |
6 | * Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net) | |
7 | */ | |
8 | ||
dda9beb4 | 9 | #include <linux/module.h> |
1da177e4 LT |
10 | #include <linux/kernel.h> |
11 | #include <linux/init.h> | |
12 | #include <linux/ioport.h> | |
764f2579 | 13 | #include <linux/of_device.h> |
1da177e4 | 14 | |
f2ad06a2 | 15 | #include <asm/prom.h> |
1da177e4 | 16 | #include <asm/io.h> |
1da177e4 LT |
17 | #include <asm/auxio.h> |
18 | ||
1da177e4 | 19 | void __iomem *auxio_register = NULL; |
dda9beb4 | 20 | EXPORT_SYMBOL(auxio_register); |
1da177e4 LT |
21 | |
22 | enum auxio_type { | |
23 | AUXIO_TYPE_NODEV, | |
24 | AUXIO_TYPE_SBUS, | |
25 | AUXIO_TYPE_EBUS | |
26 | }; | |
27 | ||
28 | static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV; | |
29 | static DEFINE_SPINLOCK(auxio_lock); | |
30 | ||
86821d18 | 31 | static void __auxio_rmw(u8 bits_on, u8 bits_off, int ebus) |
1da177e4 LT |
32 | { |
33 | if (auxio_register) { | |
1da177e4 | 34 | unsigned long flags; |
86821d18 | 35 | u8 regval, newval; |
1da177e4 LT |
36 | |
37 | spin_lock_irqsave(&auxio_lock, flags); | |
38 | ||
86821d18 DM |
39 | regval = (ebus ? |
40 | (u8) readl(auxio_register) : | |
41 | sbus_readb(auxio_register)); | |
1da177e4 LT |
42 | newval = regval | bits_on; |
43 | newval &= ~bits_off; | |
86821d18 DM |
44 | if (!ebus) |
45 | newval &= ~AUXIO_AUX1_MASK; | |
46 | if (ebus) | |
47 | writel((u32) newval, auxio_register); | |
48 | else | |
49 | sbus_writeb(newval, auxio_register); | |
1da177e4 LT |
50 | |
51 | spin_unlock_irqrestore(&auxio_lock, flags); | |
52 | } | |
53 | } | |
54 | ||
86821d18 | 55 | static void __auxio_set_bit(u8 bit, int on, int ebus) |
1da177e4 | 56 | { |
86821d18 DM |
57 | u8 bits_on = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED); |
58 | u8 bits_off = 0; | |
1da177e4 | 59 | |
86821d18 DM |
60 | if (!on) { |
61 | u8 tmp = bits_off; | |
62 | bits_off = bits_on; | |
63 | bits_on = tmp; | |
1da177e4 | 64 | } |
86821d18 | 65 | __auxio_rmw(bits_on, bits_off, ebus); |
1da177e4 LT |
66 | } |
67 | ||
68 | void auxio_set_led(int on) | |
69 | { | |
86821d18 DM |
70 | int ebus = auxio_devtype == AUXIO_TYPE_EBUS; |
71 | u8 bit; | |
72 | ||
73 | bit = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED); | |
74 | __auxio_set_bit(bit, on, ebus); | |
1da177e4 | 75 | } |
917c3660 | 76 | EXPORT_SYMBOL(auxio_set_led); |
1da177e4 | 77 | |
86821d18 | 78 | static void __auxio_sbus_set_lte(int on) |
1da177e4 | 79 | { |
86821d18 | 80 | __auxio_set_bit(AUXIO_AUX1_LTE, on, 0); |
1da177e4 LT |
81 | } |
82 | ||
83 | void auxio_set_lte(int on) | |
84 | { | |
85 | switch(auxio_devtype) { | |
86 | case AUXIO_TYPE_SBUS: | |
87 | __auxio_sbus_set_lte(on); | |
88 | break; | |
89 | case AUXIO_TYPE_EBUS: | |
90 | /* FALL-THROUGH */ | |
91 | default: | |
92 | break; | |
93 | } | |
94 | } | |
917c3660 | 95 | EXPORT_SYMBOL(auxio_set_lte); |
1da177e4 | 96 | |
3628aa06 | 97 | static const struct of_device_id auxio_match[] = { |
b5ba0740 DM |
98 | { |
99 | .name = "auxio", | |
100 | }, | |
101 | {}, | |
102 | }; | |
103 | ||
104 | MODULE_DEVICE_TABLE(of, auxio_match); | |
105 | ||
7c9503b8 | 106 | static int auxio_probe(struct platform_device *dev) |
b5ba0740 | 107 | { |
61c7a080 | 108 | struct device_node *dp = dev->dev.of_node; |
36a59bd8 DM |
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); | |
b5ba0740 | 120 | return -ENODEV; |
36a59bd8 DM |
121 | } |
122 | auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio"); | |
b5ba0740 DM |
123 | if (!auxio_register) |
124 | return -ENODEV; | |
125 | ||
36a59bd8 DM |
126 | printk(KERN_INFO "AUXIO: Found device at %s\n", |
127 | dp->full_name); | |
b5ba0740 | 128 | |
36a59bd8 DM |
129 | if (auxio_devtype == AUXIO_TYPE_EBUS) |
130 | auxio_set_led(AUXIO_LED_ON); | |
b5ba0740 DM |
131 | |
132 | return 0; | |
133 | } | |
134 | ||
4ebb24f7 | 135 | static struct platform_driver auxio_driver = { |
36a59bd8 | 136 | .probe = auxio_probe, |
4018294b GL |
137 | .driver = { |
138 | .name = "auxio", | |
4018294b | 139 | .of_match_table = auxio_match, |
a2cd1558 | 140 | }, |
b5ba0740 | 141 | }; |
b5ba0740 | 142 | |
36a59bd8 | 143 | static int __init auxio_init(void) |
b5ba0740 | 144 | { |
4ebb24f7 | 145 | return platform_driver_register(&auxio_driver); |
1da177e4 | 146 | } |
b5ba0740 DM |
147 | |
148 | /* Must be after subsys_initcall() so that busses are probed. Must | |
149 | * be before device_initcall() because things like the floppy driver | |
150 | * need to use the AUXIO register. | |
151 | */ | |
36a59bd8 | 152 | fs_initcall(auxio_init); |