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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> | |
1da177e4 LT |
11 | #include <asm/oplib.h> |
12 | #include <asm/io.h> | |
13 | #include <asm/auxio.h> | |
14 | #include <asm/string.h> /* memset(), Linux has no bzero() */ | |
15 | ||
16 | /* Probe and map in the Auxiliary I/O register */ | |
17 | ||
18 | /* auxio_register is not static because it is referenced | |
19 | * in entry.S::floppy_tdone | |
20 | */ | |
21 | void __iomem *auxio_register = NULL; | |
22 | static DEFINE_SPINLOCK(auxio_lock); | |
23 | ||
24 | void __init auxio_probe(void) | |
25 | { | |
26 | int node, auxio_nd; | |
27 | struct linux_prom_registers auxregs[1]; | |
28 | struct resource r; | |
29 | ||
30 | switch (sparc_cpu_model) { | |
c000c712 | 31 | case sparc_leon: |
1da177e4 LT |
32 | case sun4d: |
33 | case sun4: | |
34 | return; | |
35 | default: | |
36 | break; | |
37 | } | |
38 | node = prom_getchild(prom_root_node); | |
39 | auxio_nd = prom_searchsiblings(node, "auxiliary-io"); | |
40 | if(!auxio_nd) { | |
41 | node = prom_searchsiblings(node, "obio"); | |
42 | node = prom_getchild(node); | |
43 | auxio_nd = prom_searchsiblings(node, "auxio"); | |
44 | if(!auxio_nd) { | |
45 | #ifdef CONFIG_PCI | |
46 | /* There may be auxio on Ebus */ | |
47 | return; | |
48 | #else | |
49 | if(prom_searchsiblings(node, "leds")) { | |
50 | /* VME chassis sun4m machine, no auxio exists. */ | |
51 | return; | |
52 | } | |
53 | prom_printf("Cannot find auxio node, cannot continue...\n"); | |
54 | prom_halt(); | |
55 | #endif | |
56 | } | |
57 | } | |
58 | if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0) | |
59 | return; | |
60 | prom_apply_obio_ranges(auxregs, 0x1); | |
61 | /* Map the register both read and write */ | |
62 | r.flags = auxregs[0].which_io & 0xF; | |
63 | r.start = auxregs[0].phys_addr; | |
64 | r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1; | |
454eeb2d | 65 | auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio"); |
1da177e4 LT |
66 | /* Fix the address on sun4m and sun4c. */ |
67 | if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 || | |
68 | sparc_cpu_model == sun4c) | |
69 | auxio_register += (3 - ((unsigned long)auxio_register & 3)); | |
70 | ||
71 | set_auxio(AUXIO_LED, 0); | |
72 | } | |
73 | ||
74 | unsigned char get_auxio(void) | |
75 | { | |
76 | if(auxio_register) | |
77 | return sbus_readb(auxio_register); | |
78 | return 0; | |
79 | } | |
6943f3da | 80 | EXPORT_SYMBOL(get_auxio); |
1da177e4 LT |
81 | |
82 | void set_auxio(unsigned char bits_on, unsigned char bits_off) | |
83 | { | |
84 | unsigned char regval; | |
85 | unsigned long flags; | |
86 | spin_lock_irqsave(&auxio_lock, flags); | |
87 | switch(sparc_cpu_model) { | |
88 | case sun4c: | |
89 | regval = sbus_readb(auxio_register); | |
90 | sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN, | |
91 | auxio_register); | |
92 | break; | |
93 | case sun4m: | |
94 | if(!auxio_register) | |
d1a78c32 | 95 | break; /* VME chassis sun4m, no auxio. */ |
1da177e4 LT |
96 | regval = sbus_readb(auxio_register); |
97 | sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M, | |
98 | auxio_register); | |
99 | break; | |
100 | case sun4d: | |
101 | break; | |
102 | default: | |
103 | panic("Can't set AUXIO register on this machine."); | |
104 | }; | |
105 | spin_unlock_irqrestore(&auxio_lock, flags); | |
106 | } | |
6943f3da | 107 | EXPORT_SYMBOL(set_auxio); |
1da177e4 LT |
108 | |
109 | /* sun4m power control register (AUXIO2) */ | |
110 | ||
111 | volatile unsigned char * auxio_power_register = NULL; | |
112 | ||
113 | void __init auxio_power_probe(void) | |
114 | { | |
115 | struct linux_prom_registers regs; | |
116 | int node; | |
117 | struct resource r; | |
118 | ||
119 | /* Attempt to find the sun4m power control node. */ | |
120 | node = prom_getchild(prom_root_node); | |
121 | node = prom_searchsiblings(node, "obio"); | |
122 | node = prom_getchild(node); | |
123 | node = prom_searchsiblings(node, "power"); | |
124 | if (node == 0 || node == -1) | |
125 | return; | |
126 | ||
127 | /* Map the power control register. */ | |
128 | if (prom_getproperty(node, "reg", (char *)®s, sizeof(regs)) <= 0) | |
129 | return; | |
130 | prom_apply_obio_ranges(®s, 1); | |
131 | memset(&r, 0, sizeof(r)); | |
132 | r.flags = regs.which_io & 0xF; | |
133 | r.start = regs.phys_addr; | |
134 | r.end = regs.phys_addr + regs.reg_size - 1; | |
454eeb2d | 135 | auxio_power_register = (unsigned char *) of_ioremap(&r, 0, |
1da177e4 LT |
136 | regs.reg_size, "auxpower"); |
137 | ||
138 | /* Display a quick message on the console. */ | |
139 | if (auxio_power_register) | |
140 | printk(KERN_INFO "Power off control detected.\n"); | |
141 | } |