^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* auxio.c: Probing for the Sparc AUXIO register at boot time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/prom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/auxio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) void __iomem *auxio_register = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) EXPORT_SYMBOL(auxio_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) enum auxio_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) AUXIO_TYPE_NODEV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) AUXIO_TYPE_SBUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) AUXIO_TYPE_EBUS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static DEFINE_SPINLOCK(auxio_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static void __auxio_rmw(u8 bits_on, u8 bits_off, int ebus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) if (auxio_register) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u8 regval, newval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) spin_lock_irqsave(&auxio_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) regval = (ebus ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) (u8) readl(auxio_register) :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) sbus_readb(auxio_register));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) newval = regval | bits_on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) newval &= ~bits_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (!ebus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) newval &= ~AUXIO_AUX1_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (ebus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) writel((u32) newval, auxio_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) sbus_writeb(newval, auxio_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) spin_unlock_irqrestore(&auxio_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static void __auxio_set_bit(u8 bit, int on, int ebus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) u8 bits_on = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) u8 bits_off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (!on) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) u8 tmp = bits_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) bits_off = bits_on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) bits_on = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) __auxio_rmw(bits_on, bits_off, ebus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) void auxio_set_led(int on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int ebus = auxio_devtype == AUXIO_TYPE_EBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) u8 bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) bit = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) __auxio_set_bit(bit, on, ebus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) EXPORT_SYMBOL(auxio_set_led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static void __auxio_sbus_set_lte(int on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) __auxio_set_bit(AUXIO_AUX1_LTE, on, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) void auxio_set_lte(int on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) switch(auxio_devtype) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) case AUXIO_TYPE_SBUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) __auxio_sbus_set_lte(on);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) case AUXIO_TYPE_EBUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) EXPORT_SYMBOL(auxio_set_lte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static const struct of_device_id auxio_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .name = "auxio",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) MODULE_DEVICE_TABLE(of, auxio_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static int auxio_probe(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) struct device_node *dp = dev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (of_node_name_eq(dp->parent, "ebus")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) auxio_devtype = AUXIO_TYPE_EBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) size = sizeof(u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) } else if (of_node_name_eq(dp->parent, "sbus")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) auxio_devtype = AUXIO_TYPE_SBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) size = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) printk("auxio: Unknown parent bus type [%pOFn]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) dp->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (!auxio_register)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) printk(KERN_INFO "AUXIO: Found device at %pOF\n", dp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (auxio_devtype == AUXIO_TYPE_EBUS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) auxio_set_led(AUXIO_LED_ON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static struct platform_driver auxio_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .probe = auxio_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .name = "auxio",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .of_match_table = auxio_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static int __init auxio_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return platform_driver_register(&auxio_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /* Must be after subsys_initcall() so that busses are probed. Must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * be before device_initcall() because things like the floppy driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * need to use the AUXIO register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) fs_initcall(auxio_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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