1d670bd4fSSam Ravnborg /* auxio.c: Probing for the Sparc AUXIO register at boot time. 2d670bd4fSSam Ravnborg * 3d670bd4fSSam Ravnborg * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 4d670bd4fSSam Ravnborg */ 5d670bd4fSSam Ravnborg 6d670bd4fSSam Ravnborg #include <linux/stddef.h> 7d670bd4fSSam Ravnborg #include <linux/init.h> 8d670bd4fSSam Ravnborg #include <linux/spinlock.h> 9d670bd4fSSam Ravnborg #include <linux/of.h> 10d670bd4fSSam Ravnborg #include <linux/of_device.h> 117b64db60SPaul Gortmaker #include <linux/export.h> 12d670bd4fSSam Ravnborg #include <asm/oplib.h> 13d670bd4fSSam Ravnborg #include <asm/io.h> 14d670bd4fSSam Ravnborg #include <asm/auxio.h> 15d670bd4fSSam Ravnborg #include <asm/string.h> /* memset(), Linux has no bzero() */ 16d670bd4fSSam Ravnborg 17d670bd4fSSam Ravnborg /* Probe and map in the Auxiliary I/O register */ 18d670bd4fSSam Ravnborg 19d670bd4fSSam Ravnborg /* auxio_register is not static because it is referenced 20d670bd4fSSam Ravnborg * in entry.S::floppy_tdone 21d670bd4fSSam Ravnborg */ 22d670bd4fSSam Ravnborg void __iomem *auxio_register = NULL; 23d670bd4fSSam Ravnborg static DEFINE_SPINLOCK(auxio_lock); 24d670bd4fSSam Ravnborg 25d670bd4fSSam Ravnborg void __init auxio_probe(void) 26d670bd4fSSam Ravnborg { 278d125562SAndres Salomon phandle node, auxio_nd; 28d670bd4fSSam Ravnborg struct linux_prom_registers auxregs[1]; 29d670bd4fSSam Ravnborg struct resource r; 30d670bd4fSSam Ravnborg 31d670bd4fSSam Ravnborg switch (sparc_cpu_model) { 32c000c712SKristoffer Glembo case sparc_leon: 33d670bd4fSSam Ravnborg case sun4d: 34d670bd4fSSam Ravnborg case sun4: 35d670bd4fSSam Ravnborg return; 36d670bd4fSSam Ravnborg default: 37d670bd4fSSam Ravnborg break; 38d670bd4fSSam Ravnborg } 39d670bd4fSSam Ravnborg node = prom_getchild(prom_root_node); 40d670bd4fSSam Ravnborg auxio_nd = prom_searchsiblings(node, "auxiliary-io"); 41d670bd4fSSam Ravnborg if(!auxio_nd) { 42d670bd4fSSam Ravnborg node = prom_searchsiblings(node, "obio"); 43d670bd4fSSam Ravnborg node = prom_getchild(node); 44d670bd4fSSam Ravnborg auxio_nd = prom_searchsiblings(node, "auxio"); 45d670bd4fSSam Ravnborg if(!auxio_nd) { 46d670bd4fSSam Ravnborg #ifdef CONFIG_PCI 47d670bd4fSSam Ravnborg /* There may be auxio on Ebus */ 48d670bd4fSSam Ravnborg return; 49d670bd4fSSam Ravnborg #else 50d670bd4fSSam Ravnborg if(prom_searchsiblings(node, "leds")) { 51d670bd4fSSam Ravnborg /* VME chassis sun4m machine, no auxio exists. */ 52d670bd4fSSam Ravnborg return; 53d670bd4fSSam Ravnborg } 54d670bd4fSSam Ravnborg prom_printf("Cannot find auxio node, cannot continue...\n"); 55d670bd4fSSam Ravnborg prom_halt(); 56d670bd4fSSam Ravnborg #endif 57d670bd4fSSam Ravnborg } 58d670bd4fSSam Ravnborg } 59d670bd4fSSam Ravnborg if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0) 60d670bd4fSSam Ravnborg return; 61d670bd4fSSam Ravnborg prom_apply_obio_ranges(auxregs, 0x1); 62d670bd4fSSam Ravnborg /* Map the register both read and write */ 63d670bd4fSSam Ravnborg r.flags = auxregs[0].which_io & 0xF; 64d670bd4fSSam Ravnborg r.start = auxregs[0].phys_addr; 65d670bd4fSSam Ravnborg r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1; 66d670bd4fSSam Ravnborg auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio"); 67d670bd4fSSam Ravnborg /* Fix the address on sun4m and sun4c. */ 68d670bd4fSSam Ravnborg if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 || 69d670bd4fSSam Ravnborg sparc_cpu_model == sun4c) 70d670bd4fSSam Ravnborg auxio_register += (3 - ((unsigned long)auxio_register & 3)); 71d670bd4fSSam Ravnborg 72d670bd4fSSam Ravnborg set_auxio(AUXIO_LED, 0); 73d670bd4fSSam Ravnborg } 74d670bd4fSSam Ravnborg 75d670bd4fSSam Ravnborg unsigned char get_auxio(void) 76d670bd4fSSam Ravnborg { 77d670bd4fSSam Ravnborg if(auxio_register) 78d670bd4fSSam Ravnborg return sbus_readb(auxio_register); 79d670bd4fSSam Ravnborg return 0; 80d670bd4fSSam Ravnborg } 816943f3daSSam Ravnborg EXPORT_SYMBOL(get_auxio); 82d670bd4fSSam Ravnborg 83d670bd4fSSam Ravnborg void set_auxio(unsigned char bits_on, unsigned char bits_off) 84d670bd4fSSam Ravnborg { 85d670bd4fSSam Ravnborg unsigned char regval; 86d670bd4fSSam Ravnborg unsigned long flags; 87d670bd4fSSam Ravnborg spin_lock_irqsave(&auxio_lock, flags); 88d670bd4fSSam Ravnborg switch(sparc_cpu_model) { 89d670bd4fSSam Ravnborg case sun4c: 90d670bd4fSSam Ravnborg regval = sbus_readb(auxio_register); 91d670bd4fSSam Ravnborg sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN, 92d670bd4fSSam Ravnborg auxio_register); 93d670bd4fSSam Ravnborg break; 94d670bd4fSSam Ravnborg case sun4m: 95d670bd4fSSam Ravnborg if(!auxio_register) 96d670bd4fSSam Ravnborg break; /* VME chassis sun4m, no auxio. */ 97d670bd4fSSam Ravnborg regval = sbus_readb(auxio_register); 98d670bd4fSSam Ravnborg sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M, 99d670bd4fSSam Ravnborg auxio_register); 100d670bd4fSSam Ravnborg break; 101d670bd4fSSam Ravnborg case sun4d: 102d670bd4fSSam Ravnborg break; 103d670bd4fSSam Ravnborg default: 104d670bd4fSSam Ravnborg panic("Can't set AUXIO register on this machine."); 1056cb79b3fSJoe Perches } 106d670bd4fSSam Ravnborg spin_unlock_irqrestore(&auxio_lock, flags); 107d670bd4fSSam Ravnborg } 1086943f3daSSam Ravnborg EXPORT_SYMBOL(set_auxio); 109d670bd4fSSam Ravnborg 110d670bd4fSSam Ravnborg /* sun4m power control register (AUXIO2) */ 111d670bd4fSSam Ravnborg 112d670bd4fSSam Ravnborg volatile unsigned char * auxio_power_register = NULL; 113d670bd4fSSam Ravnborg 114d670bd4fSSam Ravnborg void __init auxio_power_probe(void) 115d670bd4fSSam Ravnborg { 116d670bd4fSSam Ravnborg struct linux_prom_registers regs; 1178d125562SAndres Salomon phandle node; 118d670bd4fSSam Ravnborg struct resource r; 119d670bd4fSSam Ravnborg 120d670bd4fSSam Ravnborg /* Attempt to find the sun4m power control node. */ 121d670bd4fSSam Ravnborg node = prom_getchild(prom_root_node); 122d670bd4fSSam Ravnborg node = prom_searchsiblings(node, "obio"); 123d670bd4fSSam Ravnborg node = prom_getchild(node); 124d670bd4fSSam Ravnborg node = prom_searchsiblings(node, "power"); 1254a3a2552SAndres Salomon if (node == 0 || (s32)node == -1) 126d670bd4fSSam Ravnborg return; 127d670bd4fSSam Ravnborg 128d670bd4fSSam Ravnborg /* Map the power control register. */ 129d670bd4fSSam Ravnborg if (prom_getproperty(node, "reg", (char *)®s, sizeof(regs)) <= 0) 130d670bd4fSSam Ravnborg return; 131d670bd4fSSam Ravnborg prom_apply_obio_ranges(®s, 1); 132d670bd4fSSam Ravnborg memset(&r, 0, sizeof(r)); 133d670bd4fSSam Ravnborg r.flags = regs.which_io & 0xF; 134d670bd4fSSam Ravnborg r.start = regs.phys_addr; 135d670bd4fSSam Ravnborg r.end = regs.phys_addr + regs.reg_size - 1; 136d670bd4fSSam Ravnborg auxio_power_register = (unsigned char *) of_ioremap(&r, 0, 137d670bd4fSSam Ravnborg regs.reg_size, "auxpower"); 138d670bd4fSSam Ravnborg 139d670bd4fSSam Ravnborg /* Display a quick message on the console. */ 140d670bd4fSSam Ravnborg if (auxio_power_register) 141d670bd4fSSam Ravnborg printk(KERN_INFO "Power off control detected.\n"); 142d670bd4fSSam Ravnborg } 143