linux-imx

/*

 * omap-rng.c - RNG driver for TI OMAP CPU family

 *

 * Author: Deepak Saxena <dsaxena@plexity.net>

 *

 * Copyright 2005 (c) MontaVista Software, Inc.

 *

 * Mostly based on original driver:

 *

 * Copyright (C) 2005 Nokia Corporation

 * Author: Juha Yrjölä <juha.yrjola@nokia.com>

 *

 * This file is licensed under  the terms of the GNU General Public

 * License version 2. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/random.h>

#include <linux/err.h>

#include <linux/platform_device.h>

#include <linux/hw_random.h>

#include <linux/delay.h>

#include <linux/slab.h>

#include <linux/pm_runtime.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/of_address.h>

#include <linux/interrupt.h>

#include <linux/clk.h>

​

#include <asm/io.h>

​

#define RNG_REG_STATUS_RDY          (1 << 0)

​

#define RNG_REG_INTACK_RDY_MASK         (1 << 0)

#define RNG_REG_INTACK_SHUTDOWN_OFLO_MASK   (1 << 1)

#define RNG_SHUTDOWN_OFLO_MASK          (1 << 1)

​

#define RNG_CONTROL_STARTUP_CYCLES_SHIFT    16

#define RNG_CONTROL_STARTUP_CYCLES_MASK     (0xffff << 16)

#define RNG_CONTROL_ENABLE_TRNG_SHIFT       10

#define RNG_CONTROL_ENABLE_TRNG_MASK        (1 << 10)

​

#define RNG_CONFIG_MAX_REFIL_CYCLES_SHIFT   16

#define RNG_CONFIG_MAX_REFIL_CYCLES_MASK    (0xffff << 16)

#define RNG_CONFIG_MIN_REFIL_CYCLES_SHIFT   0

#define RNG_CONFIG_MIN_REFIL_CYCLES_MASK    (0xff << 0)

​

#define RNG_CONTROL_STARTUP_CYCLES      0xff

#define RNG_CONFIG_MIN_REFIL_CYCLES     0x21

#define RNG_CONFIG_MAX_REFIL_CYCLES     0x22

​

#define RNG_ALARMCNT_ALARM_TH_SHIFT     0x0

#define RNG_ALARMCNT_ALARM_TH_MASK      (0xff << 0)

#define RNG_ALARMCNT_SHUTDOWN_TH_SHIFT      16

#define RNG_ALARMCNT_SHUTDOWN_TH_MASK       (0x1f << 16)

#define RNG_ALARM_THRESHOLD         0xff

#define RNG_SHUTDOWN_THRESHOLD          0x4

​

#define RNG_REG_FROENABLE_MASK          0xffffff

#define RNG_REG_FRODETUNE_MASK          0xffffff