?? pasemi-rng.c
字號(hào):
/* * Copyright (C) 2006-2007 PA Semi, Inc * * Maintained by: Olof Johansson <olof@lixom.net> * * Driver for the PWRficient onchip rng * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */#include <linux/module.h>#include <linux/kernel.h>#include <linux/platform_device.h>#include <linux/hw_random.h>#include <asm/of_platform.h>#include <asm/io.h>#define SDCRNG_CTL_REG 0x00#define SDCRNG_CTL_FVLD_M 0x0000f000#define SDCRNG_CTL_FVLD_S 12#define SDCRNG_CTL_KSZ 0x00000800#define SDCRNG_CTL_RSRC_CRG 0x00000010#define SDCRNG_CTL_RSRC_RRG 0x00000000#define SDCRNG_CTL_CE 0x00000004#define SDCRNG_CTL_RE 0x00000002#define SDCRNG_CTL_DR 0x00000001#define SDCRNG_CTL_SELECT_RRG_RNG (SDCRNG_CTL_RE | SDCRNG_CTL_RSRC_RRG)#define SDCRNG_CTL_SELECT_CRG_RNG (SDCRNG_CTL_CE | SDCRNG_CTL_RSRC_CRG)#define SDCRNG_VAL_REG 0x20#define MODULE_NAME "pasemi_rng"static int pasemi_rng_data_present(struct hwrng *rng){ void __iomem *rng_regs = (void __iomem *)rng->priv; return (in_le32(rng_regs + SDCRNG_CTL_REG) & SDCRNG_CTL_FVLD_M) ? 1 : 0;}static int pasemi_rng_data_read(struct hwrng *rng, u32 *data){ void __iomem *rng_regs = (void __iomem *)rng->priv; *data = in_le32(rng_regs + SDCRNG_VAL_REG); return 4;}static int pasemi_rng_init(struct hwrng *rng){ void __iomem *rng_regs = (void __iomem *)rng->priv; u32 ctl; ctl = SDCRNG_CTL_DR | SDCRNG_CTL_SELECT_RRG_RNG | SDCRNG_CTL_KSZ; out_le32(rng_regs + SDCRNG_CTL_REG, ctl); out_le32(rng_regs + SDCRNG_CTL_REG, ctl & ~SDCRNG_CTL_DR); return 0;}static void pasemi_rng_cleanup(struct hwrng *rng){ void __iomem *rng_regs = (void __iomem *)rng->priv; u32 ctl; ctl = SDCRNG_CTL_RE | SDCRNG_CTL_CE; out_le32(rng_regs + SDCRNG_CTL_REG, in_le32(rng_regs + SDCRNG_CTL_REG) & ~ctl);}static struct hwrng pasemi_rng = { .name = MODULE_NAME, .init = pasemi_rng_init, .cleanup = pasemi_rng_cleanup, .data_present = pasemi_rng_data_present, .data_read = pasemi_rng_data_read,};static int __devinit rng_probe(struct of_device *ofdev, const struct of_device_id *match){ void __iomem *rng_regs; struct device_node *rng_np = ofdev->node; struct resource res; int err = 0; err = of_address_to_resource(rng_np, 0, &res); if (err) return -ENODEV; rng_regs = ioremap(res.start, 0x100); if (!rng_regs) return -ENOMEM; pasemi_rng.priv = (unsigned long)rng_regs; printk(KERN_INFO "Registering PA Semi RNG\n"); err = hwrng_register(&pasemi_rng); if (err) iounmap(rng_regs); return err;}static int __devexit rng_remove(struct of_device *dev){ void __iomem *rng_regs = (void __iomem *)pasemi_rng.priv; hwrng_unregister(&pasemi_rng); iounmap(rng_regs); return 0;}static struct of_device_id rng_match[] = { { .compatible = "1682m-rng", }, {},};static struct of_platform_driver rng_driver = { .name = "pasemi-rng", .match_table = rng_match, .probe = rng_probe, .remove = rng_remove,};static int __init rng_init(void){ return of_register_platform_driver(&rng_driver);}module_init(rng_init);static void __exit rng_exit(void){ of_unregister_platform_driver(&rng_driver);}module_exit(rng_exit);MODULE_LICENSE("GPL");MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");MODULE_DESCRIPTION("H/W RNG driver for PA Semi processor");
?? 快捷鍵說明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號(hào)
Ctrl + =
減小字號(hào)
Ctrl + -