| 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 | |
| 18 | void __iomem *auxio_register = NULL; |
| 19 | EXPORT_SYMBOL(auxio_register); |
| 20 | |
| 21 | enum auxio_type { |
| 22 | AUXIO_TYPE_NODEV, |
| 23 | AUXIO_TYPE_SBUS, |
| 24 | AUXIO_TYPE_EBUS |
| 25 | }; |
| 26 | |
| 27 | static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV; |
| 28 | static DEFINE_SPINLOCK(auxio_lock); |
| 29 | |
| 30 | static void __auxio_sbus_set(u8 bits_on, u8 bits_off) |
| 31 | { |
| 32 | if (auxio_register) { |
| 33 | unsigned char regval; |
| 34 | unsigned long flags; |
| 35 | unsigned char newval; |
| 36 | |
| 37 | spin_lock_irqsave(&auxio_lock, flags); |
| 38 | |
| 39 | regval = sbus_readb(auxio_register); |
| 40 | newval = regval | bits_on; |
| 41 | newval &= ~bits_off; |
| 42 | newval &= ~AUXIO_AUX1_MASK; |
| 43 | sbus_writeb(newval, auxio_register); |
| 44 | |
| 45 | spin_unlock_irqrestore(&auxio_lock, flags); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | static void __auxio_ebus_set(u8 bits_on, u8 bits_off) |
| 50 | { |
| 51 | if (auxio_register) { |
| 52 | unsigned char regval; |
| 53 | unsigned long flags; |
| 54 | unsigned char newval; |
| 55 | |
| 56 | spin_lock_irqsave(&auxio_lock, flags); |
| 57 | |
| 58 | regval = (u8)readl(auxio_register); |
| 59 | newval = regval | bits_on; |
| 60 | newval &= ~bits_off; |
| 61 | writel((u32)newval, auxio_register); |
| 62 | |
| 63 | spin_unlock_irqrestore(&auxio_lock, flags); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | static inline void __auxio_ebus_set_led(int on) |
| 68 | { |
| 69 | (on) ? __auxio_ebus_set(AUXIO_PCIO_LED, 0) : |
| 70 | __auxio_ebus_set(0, AUXIO_PCIO_LED) ; |
| 71 | } |
| 72 | |
| 73 | static inline void __auxio_sbus_set_led(int on) |
| 74 | { |
| 75 | (on) ? __auxio_sbus_set(AUXIO_AUX1_LED, 0) : |
| 76 | __auxio_sbus_set(0, AUXIO_AUX1_LED) ; |
| 77 | } |
| 78 | |
| 79 | void auxio_set_led(int on) |
| 80 | { |
| 81 | switch(auxio_devtype) { |
| 82 | case AUXIO_TYPE_SBUS: |
| 83 | __auxio_sbus_set_led(on); |
| 84 | break; |
| 85 | case AUXIO_TYPE_EBUS: |
| 86 | __auxio_ebus_set_led(on); |
| 87 | break; |
| 88 | default: |
| 89 | break; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static inline void __auxio_sbus_set_lte(int on) |
| 94 | { |
| 95 | (on) ? __auxio_sbus_set(AUXIO_AUX1_LTE, 0) : |
| 96 | __auxio_sbus_set(0, AUXIO_AUX1_LTE) ; |
| 97 | } |
| 98 | |
| 99 | void auxio_set_lte(int on) |
| 100 | { |
| 101 | switch(auxio_devtype) { |
| 102 | case AUXIO_TYPE_SBUS: |
| 103 | __auxio_sbus_set_lte(on); |
| 104 | break; |
| 105 | case AUXIO_TYPE_EBUS: |
| 106 | /* FALL-THROUGH */ |
| 107 | default: |
| 108 | break; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | static struct of_device_id __initdata auxio_match[] = { |
| 113 | { |
| 114 | .name = "auxio", |
| 115 | }, |
| 116 | {}, |
| 117 | }; |
| 118 | |
| 119 | MODULE_DEVICE_TABLE(of, auxio_match); |
| 120 | |
| 121 | static int __devinit auxio_probe(struct of_device *dev, const struct of_device_id *match) |
| 122 | { |
| 123 | struct device_node *dp = dev->node; |
| 124 | unsigned long size; |
| 125 | |
| 126 | if (!strcmp(dp->parent->name, "ebus")) { |
| 127 | auxio_devtype = AUXIO_TYPE_EBUS; |
| 128 | size = sizeof(u32); |
| 129 | } else if (!strcmp(dp->parent->name, "sbus")) { |
| 130 | auxio_devtype = AUXIO_TYPE_SBUS; |
| 131 | size = 1; |
| 132 | } else { |
| 133 | printk("auxio: Unknown parent bus type [%s]\n", |
| 134 | dp->parent->name); |
| 135 | return -ENODEV; |
| 136 | } |
| 137 | auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio"); |
| 138 | if (!auxio_register) |
| 139 | return -ENODEV; |
| 140 | |
| 141 | printk(KERN_INFO "AUXIO: Found device at %s\n", |
| 142 | dp->full_name); |
| 143 | |
| 144 | if (auxio_devtype == AUXIO_TYPE_EBUS) |
| 145 | auxio_set_led(AUXIO_LED_ON); |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static struct of_platform_driver auxio_driver = { |
| 151 | .match_table = auxio_match, |
| 152 | .probe = auxio_probe, |
| 153 | .driver = { |
| 154 | .name = "auxio", |
| 155 | }, |
| 156 | }; |
| 157 | |
| 158 | static int __init auxio_init(void) |
| 159 | { |
| 160 | return of_register_driver(&auxio_driver, &of_platform_bus_type); |
| 161 | } |
| 162 | |
| 163 | /* Must be after subsys_initcall() so that busses are probed. Must |
| 164 | * be before device_initcall() because things like the floppy driver |
| 165 | * need to use the AUXIO register. |
| 166 | */ |
| 167 | fs_initcall(auxio_init); |