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150 lines
3.1 KiB
150 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* auxio.c: Probing for the Sparc AUXIO register at boot time. |
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* |
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* Copyright (C) 1996 David S. Miller ([email protected]) |
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* |
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* Refactoring for unified NCR/PCIO support 2002 Eric Brower ([email protected]) |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/ioport.h> |
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#include <linux/of_device.h> |
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#include <asm/prom.h> |
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#include <asm/io.h> |
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#include <asm/auxio.h> |
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void __iomem *auxio_register = NULL; |
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EXPORT_SYMBOL(auxio_register); |
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enum auxio_type { |
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AUXIO_TYPE_NODEV, |
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AUXIO_TYPE_SBUS, |
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AUXIO_TYPE_EBUS |
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}; |
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static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV; |
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static DEFINE_SPINLOCK(auxio_lock); |
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static void __auxio_rmw(u8 bits_on, u8 bits_off, int ebus) |
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{ |
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if (auxio_register) { |
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unsigned long flags; |
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u8 regval, newval; |
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spin_lock_irqsave(&auxio_lock, flags); |
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regval = (ebus ? |
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(u8) readl(auxio_register) : |
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sbus_readb(auxio_register)); |
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newval = regval | bits_on; |
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newval &= ~bits_off; |
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if (!ebus) |
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newval &= ~AUXIO_AUX1_MASK; |
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if (ebus) |
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writel((u32) newval, auxio_register); |
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else |
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sbus_writeb(newval, auxio_register); |
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spin_unlock_irqrestore(&auxio_lock, flags); |
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} |
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} |
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static void __auxio_set_bit(u8 bit, int on, int ebus) |
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{ |
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u8 bits_on = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED); |
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u8 bits_off = 0; |
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if (!on) { |
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u8 tmp = bits_off; |
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bits_off = bits_on; |
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bits_on = tmp; |
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} |
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__auxio_rmw(bits_on, bits_off, ebus); |
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} |
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void auxio_set_led(int on) |
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{ |
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int ebus = auxio_devtype == AUXIO_TYPE_EBUS; |
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u8 bit; |
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bit = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED); |
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__auxio_set_bit(bit, on, ebus); |
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} |
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EXPORT_SYMBOL(auxio_set_led); |
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static void __auxio_sbus_set_lte(int on) |
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{ |
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__auxio_set_bit(AUXIO_AUX1_LTE, on, 0); |
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} |
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void auxio_set_lte(int on) |
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{ |
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switch(auxio_devtype) { |
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case AUXIO_TYPE_SBUS: |
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__auxio_sbus_set_lte(on); |
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break; |
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case AUXIO_TYPE_EBUS: |
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default: |
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break; |
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} |
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} |
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EXPORT_SYMBOL(auxio_set_lte); |
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static const struct of_device_id auxio_match[] = { |
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{ |
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.name = "auxio", |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, auxio_match); |
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static int auxio_probe(struct platform_device *dev) |
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{ |
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struct device_node *dp = dev->dev.of_node; |
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unsigned long size; |
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if (of_node_name_eq(dp->parent, "ebus")) { |
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auxio_devtype = AUXIO_TYPE_EBUS; |
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size = sizeof(u32); |
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} else if (of_node_name_eq(dp->parent, "sbus")) { |
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auxio_devtype = AUXIO_TYPE_SBUS; |
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size = 1; |
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} else { |
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printk("auxio: Unknown parent bus type [%pOFn]\n", |
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dp->parent); |
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return -ENODEV; |
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} |
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auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio"); |
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if (!auxio_register) |
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return -ENODEV; |
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printk(KERN_INFO "AUXIO: Found device at %pOF\n", dp); |
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if (auxio_devtype == AUXIO_TYPE_EBUS) |
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auxio_set_led(AUXIO_LED_ON); |
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return 0; |
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} |
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static struct platform_driver auxio_driver = { |
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.probe = auxio_probe, |
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.driver = { |
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.name = "auxio", |
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.of_match_table = auxio_match, |
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}, |
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}; |
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static int __init auxio_init(void) |
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{ |
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return platform_driver_register(&auxio_driver); |
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} |
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/* Must be after subsys_initcall() so that busses are probed. Must |
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* be before device_initcall() because things like the floppy driver |
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* need to use the AUXIO register. |
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*/ |
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fs_initcall(auxio_init);
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