Commit | Line | Data |
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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 | ||
6 | #include <linux/stddef.h> | |
7 | #include <linux/init.h> | |
1da177e4 | 8 | #include <linux/spinlock.h> |
454eeb2d DM |
9 | #include <linux/of.h> |
10 | #include <linux/of_device.h> | |
7b64db60 | 11 | #include <linux/export.h> |
a3ee8faa | 12 | |
1da177e4 LT |
13 | #include <asm/oplib.h> |
14 | #include <asm/io.h> | |
15 | #include <asm/auxio.h> | |
16 | #include <asm/string.h> /* memset(), Linux has no bzero() */ | |
d550bbd4 | 17 | #include <asm/cpu_type.h> |
1da177e4 | 18 | |
a3ee8faa SR |
19 | #include "kernel.h" |
20 | ||
1da177e4 LT |
21 | /* Probe and map in the Auxiliary I/O register */ |
22 | ||
23 | /* auxio_register is not static because it is referenced | |
24 | * in entry.S::floppy_tdone | |
25 | */ | |
26 | void __iomem *auxio_register = NULL; | |
27 | static DEFINE_SPINLOCK(auxio_lock); | |
28 | ||
29 | void __init auxio_probe(void) | |
30 | { | |
8d125562 | 31 | phandle node, auxio_nd; |
1da177e4 LT |
32 | struct linux_prom_registers auxregs[1]; |
33 | struct resource r; | |
34 | ||
35 | switch (sparc_cpu_model) { | |
c000c712 | 36 | case sparc_leon: |
1da177e4 | 37 | case sun4d: |
1da177e4 LT |
38 | return; |
39 | default: | |
40 | break; | |
41 | } | |
42 | node = prom_getchild(prom_root_node); | |
43 | auxio_nd = prom_searchsiblings(node, "auxiliary-io"); | |
44 | if(!auxio_nd) { | |
45 | node = prom_searchsiblings(node, "obio"); | |
46 | node = prom_getchild(node); | |
47 | auxio_nd = prom_searchsiblings(node, "auxio"); | |
48 | if(!auxio_nd) { | |
49 | #ifdef CONFIG_PCI | |
50 | /* There may be auxio on Ebus */ | |
51 | return; | |
52 | #else | |
53 | if(prom_searchsiblings(node, "leds")) { | |
54 | /* VME chassis sun4m machine, no auxio exists. */ | |
55 | return; | |
56 | } | |
57 | prom_printf("Cannot find auxio node, cannot continue...\n"); | |
58 | prom_halt(); | |
59 | #endif | |
60 | } | |
61 | } | |
62 | if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0) | |
63 | return; | |
64 | prom_apply_obio_ranges(auxregs, 0x1); | |
65 | /* Map the register both read and write */ | |
66 | r.flags = auxregs[0].which_io & 0xF; | |
67 | r.start = auxregs[0].phys_addr; | |
68 | r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1; | |
454eeb2d | 69 | auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio"); |
6e54e950 DM |
70 | /* Fix the address on sun4m. */ |
71 | if ((((unsigned long) auxregs[0].phys_addr) & 3) == 3) | |
1da177e4 LT |
72 | auxio_register += (3 - ((unsigned long)auxio_register & 3)); |
73 | ||
74 | set_auxio(AUXIO_LED, 0); | |
75 | } | |
76 | ||
77 | unsigned char get_auxio(void) | |
78 | { | |
79 | if(auxio_register) | |
80 | return sbus_readb(auxio_register); | |
81 | return 0; | |
82 | } | |
6943f3da | 83 | EXPORT_SYMBOL(get_auxio); |
1da177e4 LT |
84 | |
85 | void set_auxio(unsigned char bits_on, unsigned char bits_off) | |
86 | { | |
87 | unsigned char regval; | |
88 | unsigned long flags; | |
89 | spin_lock_irqsave(&auxio_lock, flags); | |
6e54e950 | 90 | switch (sparc_cpu_model) { |
1da177e4 LT |
91 | case sun4m: |
92 | if(!auxio_register) | |
d1a78c32 | 93 | break; /* VME chassis sun4m, no auxio. */ |
1da177e4 LT |
94 | regval = sbus_readb(auxio_register); |
95 | sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M, | |
96 | auxio_register); | |
97 | break; | |
98 | case sun4d: | |
99 | break; | |
100 | default: | |
101 | panic("Can't set AUXIO register on this machine."); | |
6cb79b3f | 102 | } |
1da177e4 LT |
103 | spin_unlock_irqrestore(&auxio_lock, flags); |
104 | } | |
6943f3da | 105 | EXPORT_SYMBOL(set_auxio); |
1da177e4 LT |
106 | |
107 | /* sun4m power control register (AUXIO2) */ | |
108 | ||
d2aca8f9 | 109 | volatile u8 __iomem *auxio_power_register = NULL; |
1da177e4 LT |
110 | |
111 | void __init auxio_power_probe(void) | |
112 | { | |
113 | struct linux_prom_registers regs; | |
8d125562 | 114 | phandle node; |
1da177e4 LT |
115 | struct resource r; |
116 | ||
117 | /* Attempt to find the sun4m power control node. */ | |
118 | node = prom_getchild(prom_root_node); | |
119 | node = prom_searchsiblings(node, "obio"); | |
120 | node = prom_getchild(node); | |
121 | node = prom_searchsiblings(node, "power"); | |
4a3a2552 | 122 | if (node == 0 || (s32)node == -1) |
1da177e4 LT |
123 | return; |
124 | ||
125 | /* Map the power control register. */ | |
126 | if (prom_getproperty(node, "reg", (char *)®s, sizeof(regs)) <= 0) | |
127 | return; | |
128 | prom_apply_obio_ranges(®s, 1); | |
129 | memset(&r, 0, sizeof(r)); | |
130 | r.flags = regs.which_io & 0xF; | |
131 | r.start = regs.phys_addr; | |
132 | r.end = regs.phys_addr + regs.reg_size - 1; | |
d2aca8f9 SR |
133 | auxio_power_register = |
134 | (u8 __iomem *)of_ioremap(&r, 0, regs.reg_size, "auxpower"); | |
1da177e4 LT |
135 | |
136 | /* Display a quick message on the console. */ | |
137 | if (auxio_power_register) | |
138 | printk(KERN_INFO "Power off control detected.\n"); | |
139 | } |