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path: root/drivers/char/hw_random/bcm2835-rng.c
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* hwrng: bcm2835 - Switch to SPDX identifierStefan Wahren2018-11-161-5/+2
| | | | | | | | | | | | Adopt the SPDX license identifier headers to ease license compliance management. While we are at this fix the comment style, too. Cc: Lubomir Rintel <lkundrak@v3.sk> Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Eric Anholt <eric@anholt.net> Acked-by: Lubomir Rintel <lkundrak@v3.sk> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Handle deferred clock properlyStefan Wahren2018-02-221-0/+2
| | | | | | | | | | | In case the probe of the clock is deferred, we would assume it is optional. This is wrong, so defer the probe of this driver until the clock is available. Fixes: 791af4f4907a ("hwrng: bcm2835 - Manage an optional clock") Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Remove redundant dev_err call in bcm2835_rng_probe()weiyongjun \(A\)2018-01-261-3/+1
| | | | | | | | | | | There is a error message within devm_ioremap_resource already, so remove the dev_err call to avoid redundant error message. Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Reviewed-by: Eric Anholt <eric@anholt.net> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Enable BCM2835 RNG to work on BCM63xx platformsFlorian Fainelli2017-11-291-1/+10
| | | | | | | | | | We have now incorporated all necessary functionality for the BCM63xx platforms to successfully migrate over bcm2835-rng, so add the final bits: Kconfig selection and proper platform_device device type matching to keep the same platform device name for registration to work. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Add Broadcom MIPS I/O accessorsFlorian Fainelli2017-11-291-2/+11
| | | | | | | | | Broadcom MIPS HW is always strapped to match the system-wide endian such that all I/O access to this RNG block is done with the native CPU endian, account for that. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Abstract I/O accessorsFlorian Fainelli2017-11-291-8/+19
| | | | | | | | | In preparation for allowing BCM63xx to use this driver, we abstract I/O accessors such that we can easily change those later on. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Manage an optional clockFlorian Fainelli2017-11-291-1/+16
| | | | | | | | | | One of the last steps before bcm63xx-rng can be eliminated is to manage a clock during hwrng::init and hwrng::cleanup, so fetch it in the probe function, and manage it during these two steps when valid. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Rework interrupt maskingFlorian Fainelli2017-11-291-16/+23
| | | | | | | | | | | | | The interrupt masking done for Northstart Plus and Northstar (BCM5301X) is moved from being a function pointer mapped to of_device_id::data into a proper part of the hwrng::init callback. While at it, we also make the of_data be a proper structure indicating the platform specifics, since the day we need to add a second type of platform information, we would have to do that anyway. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Use device managed helpersFlorian Fainelli2017-11-291-12/+1
| | | | | | | | | | Now that we have moved the RNG disabling into a hwrng::cleanup callback, we can use the device managed registration operation and remove our remove callback since it won't do anything necessary. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Implementation cleanup callbackFlorian Fainelli2017-11-291-3/+9
| | | | | | | | | We should be disabling the RNG in a hwrng::cleanup callback if we are not longer the system selected RNG, not wait until the device driver is removed. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Move enabling to hwrng::initFlorian Fainelli2017-11-291-4/+12
| | | | | | | | | We should be moving the enabling of the HWRNG into a hwrng::init callback since we can be disabled and enabled every time a different hwrng is selected in the system. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Define a driver private contextFlorian Fainelli2017-11-291-21/+34
| | | | | | | | | | Instead of making hwrng::priv host the base register address, define a driver private context, make it per platform device instance and pass it down the different functions. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Obtain base register via resourceFlorian Fainelli2017-11-291-10/+10
| | | | | | | | | In preparation for consolidating bcm63xx-rng into bcm2835-rng, make sure that we obtain the base register via platform_get_resource() since we need to support the non-DT enabled MIPS-based BCM63xx DSL SoCs. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - handle of_iomap failuresArvind Yadav2016-09-071-2/+3
| | | | | | | | Check return value of of_iomap and handle errors correctly. Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Acked-by: Eric Anholt <eric@anholt.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Add support for Broadcom BCM5301xFlorian Fainelli2016-06-241-0/+1
| | | | | | | | | The Broadcom BCM5301x SoCs (Northstar) utilize the same random number generator peripheral as Northstar Plus and BCM2835, but just like the NSP SoC, we need to enable the interrupt. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Read as much data as availableYendapally Reddy Dhananjaya Reddy2016-05-311-2/+10
| | | | | | | | Read the requested number of data from the fifo Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Support Broadcom NSP SoC rngYendapally Reddy Dhananjaya Reddy2016-05-311-4/+30
| | | | | | | | | This supports the random number generator available in NSP SoC. Masks the rng interrupt for NSP. Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com> Acked-by: Eric Anholt <eric@anholt.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* char: hw_random: drop owner assignment from platform_driversWolfram Sang2014-10-201-1/+0
| | | | | | | A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
* hwrng: bcm2835 - fix oops when rng h/w is accessed during registrationMatt Porter2014-04-111-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | Commit "d9e7972 hwrng: add randomness to system from rng sources" exposed a bug in the bcm2835-rng driver resulting in boot failure on Raspberry Pi due to the following oops: [ 28.261523] BUG: soft lockup - CPU#0 stuck for 23s! [swapper:1] [ 28.271058] [ 28.275958] CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.0+ #11 [ 28.285374] task: db480000 ti: db484000 task.ti: db484000 [ 28.294279] PC is at bcm2835_rng_read+0x28/0x48 [ 28.302276] LR is at hwrng_register+0x1a8/0x238 . . . The RNG h/w is not completely initialized and enabled before hwrng_register() is called and so the bcm2835_rng_read() fails. Fix this by making the warmup/enable writes before registering the RNG source with the hwrng core. Signed-off-by: Matt Porter <mporter@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* drivers/char: delete non-required instances of include <linux/init.h>Paul Gortmaker2014-02-071-1/+0
| | | | | | | | | | | | | | | | | | | | | None of these files are actually using any __init type directives and hence don't need to include <linux/init.h>. Most are just a left over from __devinit and __cpuinit removal, or simply due to code getting copied from one driver to the next. Cc: David Airlie <airlied@linux.ie> Cc: Matt Mackall <mpm@selenic.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: Corey Minyard <minyard@acm.org> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Peter Huewe <peterhuewe@gmx.de> Cc: Ashley Lai <ashley@ashleylai.com> Cc: Marcel Selhorst <tpmdd@selhorst.net> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hwrng: bcm2835: fix MODULE_LICENSE tagArnd Bergmann2013-06-191-1/+1
| | | | | | | | | | | | | | | | | The MODULE_LICENSE macro invocation must use either "GPL" or "GPL v2", but not "GPLv2" in order to be detected by the module loader. This fixes the allmodconfig build error: FATAL: modpost: GPL-incompatible module bcm2835-rng.ko uses GPL-only symbol 'platform_driver_unregister' Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Lubomir Rintel <lkundrak@v3.sk> Cc: Dom Cobley <popcornmix@gmail.com> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Matt Mackall <mpm@selenic.com> Cc: linux-rpi-kernel@lists.infradead.org Cc: Herbert Xu <herbert@gondor.apana.org.au>
* hwrng: bcm2835 - Add Broadcom BCM2835 RNG driverLubomir Rintel2013-04-251-0/+113
This adds a driver for random number generator present on Broadcom BCM2835 SoC, used in Raspberry Pi and Roku 2 devices. Signed-off-by: Dom Cobley <popcornmix@gmail.com> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Tested-by: Stephen Warren <swarren@wwwdotorg.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Matt Mackall <mpm@selenic.com> Cc: linux-rpi-kernel@lists.infradead.org Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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