diff options
Diffstat (limited to 'arch/sparc/kernel/auxio_32.c')
| -rw-r--r-- | arch/sparc/kernel/auxio_32.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/arch/sparc/kernel/auxio_32.c b/arch/sparc/kernel/auxio_32.c new file mode 100644 index 000000000..a32d58817 --- /dev/null +++ b/arch/sparc/kernel/auxio_32.c @@ -0,0 +1,140 @@ +// SPDX-License-Identifier: GPL-2.0 +/* auxio.c: Probing for the Sparc AUXIO register at boot time. + * + * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + */ + +#include <linux/stddef.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/export.h> + +#include <asm/oplib.h> +#include <asm/io.h> +#include <asm/auxio.h> +#include <asm/string.h> /* memset(), Linux has no bzero() */ +#include <asm/cpu_type.h> + +#include "kernel.h" + +/* Probe and map in the Auxiliary I/O register */ + +/* auxio_register is not static because it is referenced + * in entry.S::floppy_tdone + */ +void __iomem *auxio_register = NULL; +static DEFINE_SPINLOCK(auxio_lock); + +void __init auxio_probe(void) +{ + phandle node, auxio_nd; + struct linux_prom_registers auxregs[1]; + struct resource r; + + switch (sparc_cpu_model) { + case sparc_leon: + case sun4d: + return; + default: + break; + } + node = prom_getchild(prom_root_node); + auxio_nd = prom_searchsiblings(node, "auxiliary-io"); + if(!auxio_nd) { + node = prom_searchsiblings(node, "obio"); + node = prom_getchild(node); + auxio_nd = prom_searchsiblings(node, "auxio"); + if(!auxio_nd) { +#ifdef CONFIG_PCI + /* There may be auxio on Ebus */ + return; +#else + if(prom_searchsiblings(node, "leds")) { + /* VME chassis sun4m machine, no auxio exists. */ + return; + } + prom_printf("Cannot find auxio node, cannot continue...\n"); + prom_halt(); +#endif + } + } + if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0) + return; + prom_apply_obio_ranges(auxregs, 0x1); + /* Map the register both read and write */ + r.flags = auxregs[0].which_io & 0xF; + r.start = auxregs[0].phys_addr; + r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1; + auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio"); + /* Fix the address on sun4m. */ + if ((((unsigned long) auxregs[0].phys_addr) & 3) == 3) + auxio_register += (3 - ((unsigned long)auxio_register & 3)); + + set_auxio(AUXIO_LED, 0); +} + +unsigned char get_auxio(void) +{ + if(auxio_register) + return sbus_readb(auxio_register); + return 0; +} +EXPORT_SYMBOL(get_auxio); + +void set_auxio(unsigned char bits_on, unsigned char bits_off) +{ + unsigned char regval; + unsigned long flags; + spin_lock_irqsave(&auxio_lock, flags); + switch (sparc_cpu_model) { + case sun4m: + if(!auxio_register) + break; /* VME chassis sun4m, no auxio. */ + regval = sbus_readb(auxio_register); + sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M, + auxio_register); + break; + case sun4d: + break; + default: + panic("Can't set AUXIO register on this machine."); + } + spin_unlock_irqrestore(&auxio_lock, flags); +} +EXPORT_SYMBOL(set_auxio); + +/* sun4m power control register (AUXIO2) */ + +volatile u8 __iomem *auxio_power_register = NULL; + +void __init auxio_power_probe(void) +{ + struct linux_prom_registers regs; + phandle node; + struct resource r; + + /* Attempt to find the sun4m power control node. */ + node = prom_getchild(prom_root_node); + node = prom_searchsiblings(node, "obio"); + node = prom_getchild(node); + node = prom_searchsiblings(node, "power"); + if (node == 0 || (s32)node == -1) + return; + + /* Map the power control register. */ + if (prom_getproperty(node, "reg", (char *)®s, sizeof(regs)) <= 0) + return; + prom_apply_obio_ranges(®s, 1); + memset(&r, 0, sizeof(r)); + r.flags = regs.which_io & 0xF; + r.start = regs.phys_addr; + r.end = regs.phys_addr + regs.reg_size - 1; + auxio_power_register = + (u8 __iomem *)of_ioremap(&r, 0, regs.reg_size, "auxpower"); + + /* Display a quick message on the console. */ + if (auxio_power_register) + printk(KERN_INFO "Power off control detected.\n"); +} |