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b=SBP9ICdR7OYnGMVti7OwVZYhv9XoQskVjE6Ij4FkW2hBpunUMctJn9KcSgd15+8Ut CqLox9lwbbGxTa5on5HqkzsFV+vrCW2qjaRL8QFkr7E5a7Er6Px1kYhY/tf4foLb/3 2ge/aue8vqb5EzfwVFBWvk/N5hbsezISbLG5tUFdc7ucdGCkMJRARTJ2no/Hc4cwAI A4GcHGd9KBdaxJUAH+z2X4tAr4rMbAGNnjCqaroZ96ZGQ6DWy+ncYs18GBBNsB68YW CasC9DhsMlwDfjj1a13MkbIjubWFK9QiHV5F2EoKeuUd/G0epXaMG1yY0+Jcyhn4OQ vJoWmf+yT2CPQ== Received: from p-i-exch-sc-m01.sberdevices.ru (p-i-exch-sc-m01.sberdevices.ru [172.16.192.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.sberdevices.ru (Postfix) with ESMTPS; Fri, 29 Sep 2023 13:29:51 +0300 (MSK) Received: from localhost.localdomain (100.64.160.123) by p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Fri, 29 Sep 2023 13:29:51 +0300 From: Alexey Romanov To: , , , , , , , , , , , , , CC: , , , , , , Alexey Romanov Subject: [PATCH v5 1/3] drivers: rng: meson: add support for S4 Date: Fri, 29 Sep 2023 13:29:36 +0300 Message-ID: <20230929102942.67985-2-avromanov@salutedevices.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230929102942.67985-1-avromanov@salutedevices.com> References: <20230929102942.67985-1-avromanov@salutedevices.com> MIME-Version: 1.0 X-Originating-IP: [100.64.160.123] X-ClientProxiedBy: p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 180231 [Sep 29 2023] X-KSMG-AntiSpam-Version: 5.9.59.0 X-KSMG-AntiSpam-Envelope-From: avromanov@salutedevices.com X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 535 535 da804c0ea8918f802fc60e7a20ba49783d957ba2, {Tracking_from_domain_doesnt_match_to}, d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;100.64.160.123:7.1.2;p-i-exch-sc-m01.sberdevices.ru:5.0.1,7.1.1;127.0.0.199:7.1.2;salutedevices.com:7.1.1, FromAlignment: s, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/09/29 07:52:00 #22006267 X-KSMG-AntiVirus-Status: Clean, skipped X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230929_112959_048490_7D1378D4 X-CRM114-Status: GOOD ( 16.25 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org From: Alexey Romanov For some Amlogic SOC's, mechanism to obtain random number has been changed. For example, S4 now uses status bit waiting algo. Signed-off-by: Alexey Romanov --- drivers/char/hw_random/meson-rng.c | 80 ++++++++++++++++++++++++++++-- 1 file changed, 77 insertions(+), 3 deletions(-) diff --git a/drivers/char/hw_random/meson-rng.c b/drivers/char/hw_random/meson-rng.c index a4eb8e35f13d..75225eb9fef6 100644 --- a/drivers/char/hw_random/meson-rng.c +++ b/drivers/char/hw_random/meson-rng.c @@ -13,12 +13,23 @@ #include #include #include +#include -#define RNG_DATA 0x00 +#define RNG_DATA 0x00 +#define RNG_S4_DATA 0x08 +#define RNG_S4_CFG 0x00 + +#define RUN_BIT BIT(0) +#define SEED_READY_STS_BIT BIT(31) + +struct meson_rng_priv { + int (*read)(struct hwrng *rng, void *buf, size_t max, bool wait); +}; struct meson_rng_data { void __iomem *base; struct hwrng rng; + struct device *dev; }; static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) @@ -31,16 +42,62 @@ static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) return sizeof(u32); } +static int meson_rng_wait_status(void __iomem *cfg_addr, int bit) +{ + u32 status = 0; + int ret; + + ret = readl_relaxed_poll_timeout_atomic(cfg_addr, + status, !(status & bit), + 10, 10000); + if (ret) + return -EBUSY; + + return 0; +} + +static int meson_s4_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) +{ + struct meson_rng_data *data = + container_of(rng, struct meson_rng_data, rng); + + void __iomem *cfg_addr = data->base + RNG_S4_CFG; + int err; + + writel_relaxed(readl_relaxed(cfg_addr) | SEED_READY_STS_BIT, cfg_addr); + + err = meson_rng_wait_status(cfg_addr, SEED_READY_STS_BIT); + if (err) { + dev_err(data->dev, "Seed isn't ready, try again\n"); + return err; + } + + err = meson_rng_wait_status(cfg_addr, RUN_BIT); + if (err) { + dev_err(data->dev, "Can't get random number, try again\n"); + return err; + } + + *(u32 *)buf = readl_relaxed(data->base + RNG_S4_DATA); + + return sizeof(u32); +} + static int meson_rng_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct meson_rng_data *data; struct clk *core_clk; + const struct meson_rng_priv *priv; data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; + priv = device_get_match_data(&pdev->dev); + if (!priv) + return -ENODEV; + data->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(data->base)) return PTR_ERR(data->base); @@ -51,13 +108,30 @@ static int meson_rng_probe(struct platform_device *pdev) "Failed to get core clock\n"); data->rng.name = pdev->name; - data->rng.read = meson_rng_read; + data->rng.read = priv->read; + + data->dev = &pdev->dev; return devm_hwrng_register(dev, &data->rng); } +static const struct meson_rng_priv meson_rng_priv = { + .read = meson_rng_read, +}; + +static const struct meson_rng_priv meson_rng_priv_s4 = { + .read = meson_s4_rng_read, +}; + static const struct of_device_id meson_rng_of_match[] = { - { .compatible = "amlogic,meson-rng", }, + { + .compatible = "amlogic,meson-rng", + .data = (void *)&meson_rng_priv, + }, + { + .compatible = "amlogic,meson-s4-rng", + .data = (void *)&meson_rng_priv_s4, + }, {}, }; MODULE_DEVICE_TABLE(of, meson_rng_of_match);