Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * drivers/char/hw_random/ixp4xx-rng.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * RNG driver for Intel IXP4xx family of NPUs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Author: Deepak Saxena <dsaxena@plexity.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Copyright 2005 (c) MontaVista Software, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Fixes by Michael Buesch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * This file is licensed under  the terms of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * License version 2. This program is licensed "as is" without any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * warranty of any kind, whether express or implied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/hw_random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <mach/hardware.h>
^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 int ixp4xx_rng_data_read(struct hwrng *rng, u32 *buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	void __iomem * rng_base = (void __iomem *)rng->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	*buffer = __raw_readl(rng_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	return 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static struct hwrng ixp4xx_rng_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	.name		= "ixp4xx",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	.data_read	= ixp4xx_rng_data_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static int __init ixp4xx_rng_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	void __iomem * rng_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	if (!cpu_is_ixp46x()) /* includes IXP455 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	rng_base = ioremap(0x70002100, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	if (!rng_base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	ixp4xx_rng_ops.priv = (unsigned long)rng_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	err = hwrng_register(&ixp4xx_rng_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		iounmap(rng_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	return err;
^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 void __exit ixp4xx_rng_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	void __iomem * rng_base = (void __iomem *)ixp4xx_rng_ops.priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	hwrng_unregister(&ixp4xx_rng_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	iounmap(rng_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) module_init(ixp4xx_rng_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) module_exit(ixp4xx_rng_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) MODULE_DESCRIPTION("H/W Pseudo-Random Number Generator (RNG) driver for IXP45x/46x");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) MODULE_LICENSE("GPL");