From patchwork Tue Jan 5 14:02:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Bogendoerfer X-Patchwork-Id: 357309 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4901BC07EBE for ; Tue, 5 Jan 2021 14:06:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 21A5422B30 for ; Tue, 5 Jan 2021 14:06:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730679AbhAEOGB (ORCPT ); Tue, 5 Jan 2021 09:06:01 -0500 Received: from mx2.suse.de ([195.135.220.15]:57714 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729032AbhAEOFI (ORCPT ); Tue, 5 Jan 2021 09:05:08 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C617AAD19; Tue, 5 Jan 2021 14:03:44 +0000 (UTC) From: Thomas Bogendoerfer To: Matt Mackall , Herbert Xu , Dan Williams , Vinod Koul , "David S. Miller" , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Jakub Kicinski , Alessandro Zummo , Alexandre Belloni , Mark Brown , Wim Van Sebroeck , Guenter Roeck , Liam Girdwood , Jaroslav Kysela , Takashi Iwai , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, dmaengine@vger.kernel.org, linux-ide@vger.kernel.org, linux-mtd@lists.infradead.org, netdev@vger.kernel.org, linux-rtc@vger.kernel.org, linux-spi@vger.kernel.org, linux-watchdog@vger.kernel.org, alsa-devel@alsa-project.org Subject: [PATCH 07/10] char: hw_random: Remove tx4939 driver Date: Tue, 5 Jan 2021 15:02:52 +0100 Message-Id: <20210105140305.141401-8-tsbogend@alpha.franken.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210105140305.141401-1-tsbogend@alpha.franken.de> References: <20210105140305.141401-1-tsbogend@alpha.franken.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org CPU support for TX49xx is getting removed, so remove hw_random driver for it. Signed-off-by: Thomas Bogendoerfer --- drivers/char/hw_random/Kconfig | 13 --- drivers/char/hw_random/Makefile | 1 - drivers/char/hw_random/tx4939-rng.c | 157 ---------------------------- 3 files changed, 171 deletions(-) delete mode 100644 drivers/char/hw_random/tx4939-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 1fe006f3f12f..9d13d640384a 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -226,19 +226,6 @@ config HW_RANDOM_VIRTIO To compile this driver as a module, choose M here: the module will be called virtio-rng. If unsure, say N. -config HW_RANDOM_TX4939 - tristate "TX4939 Random Number Generator support" - depends on SOC_TX4939 - default HW_RANDOM - help - This driver provides kernel-side support for the Random Number - Generator hardware found on TX4939 SoC. - - To compile this driver as a module, choose M here: the - module will be called tx4939-rng. - - If unsure, say Y. - config HW_RANDOM_MXC_RNGA tristate "Freescale i.MX RNGA Random Number Generator" depends on SOC_IMX31 diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 8933fada74f2..b2aa37162e24 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -20,7 +20,6 @@ obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o obj-$(CONFIG_HW_RANDOM_OMAP3_ROM) += omap3-rom-rng.o obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o -obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o obj-$(CONFIG_HW_RANDOM_IMX_RNGC) += imx-rngc.o obj-$(CONFIG_HW_RANDOM_INGENIC_RNG) += ingenic-rng.o diff --git a/drivers/char/hw_random/tx4939-rng.c b/drivers/char/hw_random/tx4939-rng.c deleted file mode 100644 index c8bd34e740fd..000000000000 --- a/drivers/char/hw_random/tx4939-rng.c +++ /dev/null @@ -1,157 +0,0 @@ -/* - * RNG driver for TX4939 Random Number Generators (RNG) - * - * Copyright (C) 2009 Atsushi Nemoto - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#define TX4939_RNG_RCSR 0x00000000 -#define TX4939_RNG_ROR(n) (0x00000018 + (n) * 8) - -#define TX4939_RNG_RCSR_INTE 0x00000008 -#define TX4939_RNG_RCSR_RST 0x00000004 -#define TX4939_RNG_RCSR_FIN 0x00000002 -#define TX4939_RNG_RCSR_ST 0x00000001 - -struct tx4939_rng { - struct hwrng rng; - void __iomem *base; - u64 databuf[3]; - unsigned int data_avail; -}; - -static void rng_io_start(void) -{ -#ifndef CONFIG_64BIT - /* - * readq is reading a 64-bit register using a 64-bit load. On - * a 32-bit kernel however interrupts or any other processor - * exception would clobber the upper 32-bit of the processor - * register so interrupts need to be disabled. - */ - local_irq_disable(); -#endif -} - -static void rng_io_end(void) -{ -#ifndef CONFIG_64BIT - local_irq_enable(); -#endif -} - -static u64 read_rng(void __iomem *base, unsigned int offset) -{ - return ____raw_readq(base + offset); -} - -static void write_rng(u64 val, void __iomem *base, unsigned int offset) -{ - return ____raw_writeq(val, base + offset); -} - -static int tx4939_rng_data_present(struct hwrng *rng, int wait) -{ - struct tx4939_rng *rngdev = container_of(rng, struct tx4939_rng, rng); - int i; - - if (rngdev->data_avail) - return rngdev->data_avail; - for (i = 0; i < 20; i++) { - rng_io_start(); - if (!(read_rng(rngdev->base, TX4939_RNG_RCSR) - & TX4939_RNG_RCSR_ST)) { - rngdev->databuf[0] = - read_rng(rngdev->base, TX4939_RNG_ROR(0)); - rngdev->databuf[1] = - read_rng(rngdev->base, TX4939_RNG_ROR(1)); - rngdev->databuf[2] = - read_rng(rngdev->base, TX4939_RNG_ROR(2)); - rngdev->data_avail = - sizeof(rngdev->databuf) / sizeof(u32); - /* Start RNG */ - write_rng(TX4939_RNG_RCSR_ST, - rngdev->base, TX4939_RNG_RCSR); - wait = 0; - } - rng_io_end(); - if (!wait) - break; - /* 90 bus clock cycles by default for generation */ - ndelay(90 * 5); - } - return rngdev->data_avail; -} - -static int tx4939_rng_data_read(struct hwrng *rng, u32 *buffer) -{ - struct tx4939_rng *rngdev = container_of(rng, struct tx4939_rng, rng); - - rngdev->data_avail--; - *buffer = *((u32 *)&rngdev->databuf + rngdev->data_avail); - return sizeof(u32); -} - -static int __init tx4939_rng_probe(struct platform_device *dev) -{ - struct tx4939_rng *rngdev; - int i; - - rngdev = devm_kzalloc(&dev->dev, sizeof(*rngdev), GFP_KERNEL); - if (!rngdev) - return -ENOMEM; - rngdev->base = devm_platform_ioremap_resource(dev, 0); - if (IS_ERR(rngdev->base)) - return PTR_ERR(rngdev->base); - - rngdev->rng.name = dev_name(&dev->dev); - rngdev->rng.data_present = tx4939_rng_data_present; - rngdev->rng.data_read = tx4939_rng_data_read; - - rng_io_start(); - /* Reset RNG */ - write_rng(TX4939_RNG_RCSR_RST, rngdev->base, TX4939_RNG_RCSR); - write_rng(0, rngdev->base, TX4939_RNG_RCSR); - /* Start RNG */ - write_rng(TX4939_RNG_RCSR_ST, rngdev->base, TX4939_RNG_RCSR); - rng_io_end(); - /* - * Drop first two results. From the datasheet: - * The quality of the random numbers generated immediately - * after reset can be insufficient. Therefore, do not use - * random numbers obtained from the first and second - * generations; use the ones from the third or subsequent - * generation. - */ - for (i = 0; i < 2; i++) { - rngdev->data_avail = 0; - if (!tx4939_rng_data_present(&rngdev->rng, 1)) - return -EIO; - } - - platform_set_drvdata(dev, rngdev); - return devm_hwrng_register(&dev->dev, &rngdev->rng); -} - -static struct platform_driver tx4939_rng_driver = { - .driver = { - .name = "tx4939-rng", - }, -}; - -module_platform_driver_probe(tx4939_rng_driver, tx4939_rng_probe); - -MODULE_DESCRIPTION("H/W Random Number Generator (RNG) driver for TX4939"); -MODULE_LICENSE("GPL");