/* * omap-rng.c - RNG driver for TI OMAP CPU family * * Author: Deepak Saxena <[email protected]> * * Copyright 2005 (c) MontaVista Software, Inc. * * Mostly based on original driver: * * Copyright (C) 2005 Nokia Corporation * Author: Juha Yrjölä <[email protected]> * * 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/kernel.h> #include <linux/slab.h> #include <linux/pm_runtime.h> #include <linux/of.h> #include <linux/interrupt.h> #include <linux/clk.h> #include <linux/io.h> #define RNG_REG_STATUS_RDY … #define RNG_REG_INTACK_RDY_MASK … #define RNG_REG_INTACK_SHUTDOWN_OFLO_MASK … #define RNG_SHUTDOWN_OFLO_MASK … #define RNG_CONTROL_STARTUP_CYCLES_SHIFT … #define RNG_CONTROL_STARTUP_CYCLES_MASK … #define RNG_CONTROL_ENABLE_TRNG_SHIFT … #define RNG_CONTROL_ENABLE_TRNG_MASK … #define RNG_CONFIG_MAX_REFIL_CYCLES_SHIFT … #define RNG_CONFIG_MAX_REFIL_CYCLES_MASK … #define RNG_CONFIG_MIN_REFIL_CYCLES_SHIFT … #define RNG_CONFIG_MIN_REFIL_CYCLES_MASK … #define RNG_CONTROL_STARTUP_CYCLES … #define RNG_CONFIG_MIN_REFIL_CYCLES … #define RNG_CONFIG_MAX_REFIL_CYCLES … #define RNG_ALARMCNT_ALARM_TH_SHIFT … #define RNG_ALARMCNT_ALARM_TH_MASK … #define RNG_ALARMCNT_SHUTDOWN_TH_SHIFT … #define RNG_ALARMCNT_SHUTDOWN_TH_MASK … #define RNG_ALARM_THRESHOLD … #define RNG_SHUTDOWN_THRESHOLD … #define RNG_REG_FROENABLE_MASK … #define RNG_REG_FRODETUNE_MASK … #define OMAP2_RNG_OUTPUT_SIZE … #define OMAP4_RNG_OUTPUT_SIZE … #define EIP76_RNG_OUTPUT_SIZE … /* * EIP76 RNG takes approx. 700us to produce 16 bytes of output data * as per testing results. And to account for the lack of udelay()'s * reliability, we keep the timeout as 1000us. */ #define RNG_DATA_FILL_TIMEOUT … enum { … }; static const u16 reg_map_omap2[] = …; static const u16 reg_map_omap4[] = …; static const u16 reg_map_eip76[] = …; struct omap_rng_dev; /** * struct omap_rng_pdata - RNG IP block-specific data * @regs: Pointer to the register offsets structure. * @data_size: No. of bytes in RNG output. * @data_present: Callback to determine if data is available. * @init: Callback for IP specific initialization sequence. * @cleanup: Callback for IP specific cleanup sequence. */ struct omap_rng_pdata { … }; struct omap_rng_dev { … }; static inline u32 omap_rng_read(struct omap_rng_dev *priv, u16 reg) { … } static inline void omap_rng_write(struct omap_rng_dev *priv, u16 reg, u32 val) { … } static int omap_rng_do_read(struct hwrng *rng, void *data, size_t max, bool wait) { … } static int omap_rng_init(struct hwrng *rng) { … } static void omap_rng_cleanup(struct hwrng *rng) { … } static inline u32 omap2_rng_data_present(struct omap_rng_dev *priv) { … } static int omap2_rng_init(struct omap_rng_dev *priv) { … } static void omap2_rng_cleanup(struct omap_rng_dev *priv) { … } static struct omap_rng_pdata omap2_rng_pdata = …; static inline u32 omap4_rng_data_present(struct omap_rng_dev *priv) { … } static int eip76_rng_init(struct omap_rng_dev *priv) { … } static int omap4_rng_init(struct omap_rng_dev *priv) { … } static void omap4_rng_cleanup(struct omap_rng_dev *priv) { … } static irqreturn_t omap4_rng_irq(int irq, void *dev_id) { … } static struct omap_rng_pdata omap4_rng_pdata = …; static struct omap_rng_pdata eip76_rng_pdata = …; static const struct of_device_id omap_rng_of_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(of, omap_rng_of_match); static int of_get_omap_rng_device_details(struct omap_rng_dev *priv, struct platform_device *pdev) { … } static int get_omap_rng_device_details(struct omap_rng_dev *omap_rng) { … } static int omap_rng_probe(struct platform_device *pdev) { … } static void omap_rng_remove(struct platform_device *pdev) { … } static int __maybe_unused omap_rng_suspend(struct device *dev) { … } static int __maybe_unused omap_rng_resume(struct device *dev) { … } static SIMPLE_DEV_PM_OPS(omap_rng_pm, omap_rng_suspend, omap_rng_resume); static struct platform_driver omap_rng_driver = …; module_platform_driver(…) …; MODULE_ALIAS(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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