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> | |
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) { | |
31 | case sun4d: | |
32 | case sun4: | |
33 | return; | |
34 | default: | |
35 | break; | |
36 | } | |
37 | node = prom_getchild(prom_root_node); | |
38 | auxio_nd = prom_searchsiblings(node, "auxiliary-io"); | |
39 | if(!auxio_nd) { | |
40 | node = prom_searchsiblings(node, "obio"); | |
41 | node = prom_getchild(node); | |
42 | auxio_nd = prom_searchsiblings(node, "auxio"); | |
43 | if(!auxio_nd) { | |
44 | #ifdef CONFIG_PCI | |
45 | /* There may be auxio on Ebus */ | |
46 | return; | |
47 | #else | |
48 | if(prom_searchsiblings(node, "leds")) { | |
49 | /* VME chassis sun4m machine, no auxio exists. */ | |
50 | return; | |
51 | } | |
52 | prom_printf("Cannot find auxio node, cannot continue...\n"); | |
53 | prom_halt(); | |
54 | #endif | |
55 | } | |
56 | } | |
57 | if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0) | |
58 | return; | |
59 | prom_apply_obio_ranges(auxregs, 0x1); | |
60 | /* Map the register both read and write */ | |
61 | r.flags = auxregs[0].which_io & 0xF; | |
62 | r.start = auxregs[0].phys_addr; | |
63 | r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1; | |
454eeb2d | 64 | auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio"); |
1da177e4 LT |
65 | /* Fix the address on sun4m and sun4c. */ |
66 | if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 || | |
67 | sparc_cpu_model == sun4c) | |
68 | auxio_register += (3 - ((unsigned long)auxio_register & 3)); | |
69 | ||
70 | set_auxio(AUXIO_LED, 0); | |
71 | } | |
72 | ||
73 | unsigned char get_auxio(void) | |
74 | { | |
75 | if(auxio_register) | |
76 | return sbus_readb(auxio_register); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | void set_auxio(unsigned char bits_on, unsigned char bits_off) | |
81 | { | |
82 | unsigned char regval; | |
83 | unsigned long flags; | |
84 | spin_lock_irqsave(&auxio_lock, flags); | |
85 | switch(sparc_cpu_model) { | |
86 | case sun4c: | |
87 | regval = sbus_readb(auxio_register); | |
88 | sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN, | |
89 | auxio_register); | |
90 | break; | |
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."); | |
102 | }; | |
103 | spin_unlock_irqrestore(&auxio_lock, flags); | |
104 | } | |
105 | ||
106 | ||
107 | /* sun4m power control register (AUXIO2) */ | |
108 | ||
109 | volatile unsigned char * auxio_power_register = NULL; | |
110 | ||
111 | void __init auxio_power_probe(void) | |
112 | { | |
113 | struct linux_prom_registers regs; | |
114 | int node; | |
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"); | |
122 | if (node == 0 || node == -1) | |
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; | |
454eeb2d | 133 | auxio_power_register = (unsigned char *) of_ioremap(&r, 0, |
1da177e4 LT |
134 | regs.reg_size, "auxpower"); |
135 | ||
136 | /* Display a quick message on the console. */ | |
137 | if (auxio_power_register) | |
138 | printk(KERN_INFO "Power off control detected.\n"); | |
139 | } |