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 * Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net) 6 */ 7 8#include <linux/module.h> 9#include <linux/kernel.h> 10#include <linux/init.h> 11#include <linux/ioport.h> 12#include <linux/of_device.h> 13 14#include <asm/prom.h> 15#include <asm/io.h> 16#include <asm/auxio.h> 17 18void __iomem *auxio_register = NULL; 19EXPORT_SYMBOL(auxio_register); 20 21enum auxio_type { 22 AUXIO_TYPE_NODEV, 23 AUXIO_TYPE_SBUS, 24 AUXIO_TYPE_EBUS 25}; 26 27static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV; 28static DEFINE_SPINLOCK(auxio_lock); 29 30static void __auxio_rmw(u8 bits_on, u8 bits_off, int ebus) 31{ 32 if (auxio_register) { 33 unsigned long flags; 34 u8 regval, newval; 35 36 spin_lock_irqsave(&auxio_lock, flags); 37 38 regval = (ebus ? 39 (u8) readl(auxio_register) : 40 sbus_readb(auxio_register)); 41 newval = regval | bits_on; 42 newval &= ~bits_off; 43 if (!ebus) 44 newval &= ~AUXIO_AUX1_MASK; 45 if (ebus) 46 writel((u32) newval, auxio_register); 47 else 48 sbus_writeb(newval, auxio_register); 49 50 spin_unlock_irqrestore(&auxio_lock, flags); 51 } 52} 53 54static void __auxio_set_bit(u8 bit, int on, int ebus) 55{ 56 u8 bits_on = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED); 57 u8 bits_off = 0; 58 59 if (!on) { 60 u8 tmp = bits_off; 61 bits_off = bits_on; 62 bits_on = tmp; 63 } 64 __auxio_rmw(bits_on, bits_off, ebus); 65} 66 67void auxio_set_led(int on) 68{ 69 int ebus = auxio_devtype == AUXIO_TYPE_EBUS; 70 u8 bit; 71 72 bit = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED); 73 __auxio_set_bit(bit, on, ebus); 74} 75EXPORT_SYMBOL(auxio_set_led); 76 77static void __auxio_sbus_set_lte(int on) 78{ 79 __auxio_set_bit(AUXIO_AUX1_LTE, on, 0); 80} 81 82void auxio_set_lte(int on) 83{ 84 switch(auxio_devtype) { 85 case AUXIO_TYPE_SBUS: 86 __auxio_sbus_set_lte(on); 87 break; 88 case AUXIO_TYPE_EBUS: 89 /* FALL-THROUGH */ 90 default: 91 break; 92 } 93} 94EXPORT_SYMBOL(auxio_set_lte); 95 96static struct of_device_id __initdata auxio_match[] = { 97 { 98 .name = "auxio", 99 }, 100 {}, 101}; 102 103MODULE_DEVICE_TABLE(of, auxio_match); 104 105static int __devinit auxio_probe(struct platform_device *dev, 106 const struct of_device_id *match) 107{ 108 struct device_node *dp = dev->dev.of_node; 109 unsigned long size; 110 111 if (!strcmp(dp->parent->name, "ebus")) { 112 auxio_devtype = AUXIO_TYPE_EBUS; 113 size = sizeof(u32); 114 } else if (!strcmp(dp->parent->name, "sbus")) { 115 auxio_devtype = AUXIO_TYPE_SBUS; 116 size = 1; 117 } else { 118 printk("auxio: Unknown parent bus type [%s]\n", 119 dp->parent->name); 120 return -ENODEV; 121 } 122 auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio"); 123 if (!auxio_register) 124 return -ENODEV; 125 126 printk(KERN_INFO "AUXIO: Found device at %s\n", 127 dp->full_name); 128 129 if (auxio_devtype == AUXIO_TYPE_EBUS) 130 auxio_set_led(AUXIO_LED_ON); 131 132 return 0; 133} 134 135static struct of_platform_driver auxio_driver = { 136 .probe = auxio_probe, 137 .driver = { 138 .name = "auxio", 139 .owner = THIS_MODULE, 140 .of_match_table = auxio_match, 141 }, 142}; 143 144static int __init auxio_init(void) 145{ 146 return of_register_platform_driver(&auxio_driver); 147} 148 149/* Must be after subsys_initcall() so that busses are probed. Must 150 * be before device_initcall() because things like the floppy driver 151 * need to use the AUXIO register. 152 */ 153fs_initcall(auxio_init); 154