1 | // SPDX-License-Identifier: GPL-2.0 |
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 | |
7 | #include <linux/stddef.h> |
8 | #include <linux/init.h> |
9 | #include <linux/spinlock.h> |
10 | #include <linux/of.h> |
11 | #include <linux/export.h> |
12 | |
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() */ |
17 | #include <asm/cpu_type.h> |
18 | |
19 | #include "kernel.h" |
20 | |
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 | { |
31 | phandle node, auxio_nd; |
32 | struct linux_prom_registers auxregs[1]; |
33 | struct resource r; |
34 | |
35 | switch (sparc_cpu_model) { |
36 | case sparc_leon: |
37 | case sun4d: |
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; |
69 | auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio" ); |
70 | /* Fix the address on sun4m. */ |
71 | if ((((unsigned long) auxregs[0].phys_addr) & 3) == 3) |
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 | } |
83 | EXPORT_SYMBOL(get_auxio); |
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); |
90 | switch (sparc_cpu_model) { |
91 | case sun4m: |
92 | if(!auxio_register) |
93 | break; /* VME chassis sun4m, no auxio. */ |
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(fmt: "Can't set AUXIO register on this machine." ); |
102 | } |
103 | spin_unlock_irqrestore(lock: &auxio_lock, flags); |
104 | } |
105 | EXPORT_SYMBOL(set_auxio); |
106 | |
107 | /* sun4m power control register (AUXIO2) */ |
108 | |
109 | volatile u8 __iomem *auxio_power_register = NULL; |
110 | |
111 | void __init auxio_power_probe(void) |
112 | { |
113 | struct linux_prom_registers regs; |
114 | phandle 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 || (s32)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; |
133 | auxio_power_register = |
134 | (u8 __iomem *)of_ioremap(&r, 0, 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 | } |
140 | |