auxio.c
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上传日期:2013-04-10
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- /* 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/config.h>
- #include <asm/oplib.h>
- #include <asm/io.h>
- #include <asm/auxio.h>
- #include <asm/string.h> /* memset(), Linux has no bzero() */
- /* Probe and map in the Auxiliary I/O register */
- unsigned char *auxio_register;
- void __init auxio_probe(void)
- {
- int node, auxio_nd;
- struct linux_prom_registers auxregs[1];
- struct resource r;
- switch (sparc_cpu_model) {
- case sun4d:
- case sun4:
- auxio_register = 0;
- 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 */
- auxio_register = 0;
- return;
- #else
- if(prom_searchsiblings(node, "leds")) {
- /* VME chassis sun4m machine, no auxio exists. */
- auxio_register = 0;
- return;
- }
- prom_printf("Cannot find auxio node, cannot continue...n");
- prom_halt();
- #endif
- }
- }
- prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs));
- 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 = (unsigned char *) sbus_ioremap(&r, 0,
- auxregs[0].reg_size, "auxio");
- /* Fix the address on sun4m and sun4c. */
- if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
- sparc_cpu_model == sun4c)
- auxio_register = (unsigned char *) ((int)auxio_register | 3);
- TURN_ON_LED;
- }
- /* sun4m power control register (AUXIO2) */
- volatile unsigned char * auxio_power_register = NULL;
- void __init auxio_power_probe(void)
- {
- struct linux_prom_registers regs;
- int 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 || node == -1)
- return;
- /* Map the power control register. */
- prom_getproperty(node, "reg", (char *)®s, sizeof(regs));
- 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 = (unsigned char *) sbus_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");
- }