Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * Support for hardware-assisted userspace interrupt masking.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (C) 2010  Paul Mundt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * License.  See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define pr_fmt(fmt) "intc: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/sizes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "internals.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static void __iomem *uimask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) show_intc_userimask(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		    struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	return sprintf(buf, "%d\n", (__raw_readl(uimask) >> 4) & 0xf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) store_intc_userimask(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		     struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		     const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	unsigned long level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	level = simple_strtoul(buf, NULL, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	 * Minimal acceptable IRQ levels are in the 2 - 16 range, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	 * these are chomped so as to not interfere with normal IRQs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	 * Level 1 is a special case on some CPUs in that it's not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	 * directly settable, but given that USERIMASK cuts off below a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	 * certain level, we don't care about this limitation here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	 * Level 0 on the other hand equates to user masking disabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	 * We use the default priority level as a cut off so that only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	 * special case opt-in IRQs can be mangled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (level >= intc_get_dfl_prio_level())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	__raw_writel(0xa5 << 24 | level << 4, uimask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static DEVICE_ATTR(userimask, S_IRUSR | S_IWUSR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		   show_intc_userimask, store_intc_userimask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static int __init userimask_sysdev_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	if (unlikely(!uimask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	return device_create_file(intc_subsys.dev_root, &dev_attr_userimask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) late_initcall(userimask_sysdev_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) int register_intc_userimask(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	if (unlikely(uimask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	uimask = ioremap(addr, SZ_4K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	if (unlikely(!uimask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	pr_info("userimask support registered for levels 0 -> %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 		intc_get_dfl_prio_level() - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }