summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/auxio_64.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/kernel/auxio_64.c')
-rw-r--r--arch/sparc/kernel/auxio_64.c150
1 files changed, 150 insertions, 0 deletions
diff --git a/arch/sparc/kernel/auxio_64.c b/arch/sparc/kernel/auxio_64.c
new file mode 100644
index 000000000..774a82b0c
--- /dev/null
+++ b/arch/sparc/kernel/auxio_64.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0
+/* auxio.c: Probing for the Sparc AUXIO register at boot time.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ *
+ * Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+
+#include <asm/prom.h>
+#include <asm/io.h>
+#include <asm/auxio.h>
+
+void __iomem *auxio_register = NULL;
+EXPORT_SYMBOL(auxio_register);
+
+enum auxio_type {
+ AUXIO_TYPE_NODEV,
+ AUXIO_TYPE_SBUS,
+ AUXIO_TYPE_EBUS
+};
+
+static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV;
+static DEFINE_SPINLOCK(auxio_lock);
+
+static void __auxio_rmw(u8 bits_on, u8 bits_off, int ebus)
+{
+ if (auxio_register) {
+ unsigned long flags;
+ u8 regval, newval;
+
+ spin_lock_irqsave(&auxio_lock, flags);
+
+ regval = (ebus ?
+ (u8) readl(auxio_register) :
+ sbus_readb(auxio_register));
+ newval = regval | bits_on;
+ newval &= ~bits_off;
+ if (!ebus)
+ newval &= ~AUXIO_AUX1_MASK;
+ if (ebus)
+ writel((u32) newval, auxio_register);
+ else
+ sbus_writeb(newval, auxio_register);
+
+ spin_unlock_irqrestore(&auxio_lock, flags);
+ }
+}
+
+static void __auxio_set_bit(u8 bit, int on, int ebus)
+{
+ u8 bits_on = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
+ u8 bits_off = 0;
+
+ if (!on) {
+ u8 tmp = bits_off;
+ bits_off = bits_on;
+ bits_on = tmp;
+ }
+ __auxio_rmw(bits_on, bits_off, ebus);
+}
+
+void auxio_set_led(int on)
+{
+ int ebus = auxio_devtype == AUXIO_TYPE_EBUS;
+ u8 bit;
+
+ bit = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
+ __auxio_set_bit(bit, on, ebus);
+}
+EXPORT_SYMBOL(auxio_set_led);
+
+static void __auxio_sbus_set_lte(int on)
+{
+ __auxio_set_bit(AUXIO_AUX1_LTE, on, 0);
+}
+
+void auxio_set_lte(int on)
+{
+ switch(auxio_devtype) {
+ case AUXIO_TYPE_SBUS:
+ __auxio_sbus_set_lte(on);
+ break;
+ case AUXIO_TYPE_EBUS:
+ default:
+ break;
+ }
+}
+EXPORT_SYMBOL(auxio_set_lte);
+
+static const struct of_device_id auxio_match[] = {
+ {
+ .name = "auxio",
+ },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, auxio_match);
+
+static int auxio_probe(struct platform_device *dev)
+{
+ struct device_node *dp = dev->dev.of_node;
+ unsigned long size;
+
+ if (of_node_name_eq(dp->parent, "ebus")) {
+ auxio_devtype = AUXIO_TYPE_EBUS;
+ size = sizeof(u32);
+ } else if (of_node_name_eq(dp->parent, "sbus")) {
+ auxio_devtype = AUXIO_TYPE_SBUS;
+ size = 1;
+ } else {
+ printk("auxio: Unknown parent bus type [%pOFn]\n",
+ dp->parent);
+ return -ENODEV;
+ }
+ auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio");
+ if (!auxio_register)
+ return -ENODEV;
+
+ printk(KERN_INFO "AUXIO: Found device at %pOF\n", dp);
+
+ if (auxio_devtype == AUXIO_TYPE_EBUS)
+ auxio_set_led(AUXIO_LED_ON);
+
+ return 0;
+}
+
+static struct platform_driver auxio_driver = {
+ .probe = auxio_probe,
+ .driver = {
+ .name = "auxio",
+ .of_match_table = auxio_match,
+ },
+};
+
+static int __init auxio_init(void)
+{
+ return platform_driver_register(&auxio_driver);
+}
+
+/* Must be after subsys_initcall() so that busses are probed. Must
+ * be before device_initcall() because things like the floppy driver
+ * need to use the AUXIO register.
+ */
+fs_initcall(auxio_init);