From patchwork Fri Jul 17 09:01:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rayagonda Kokatanur X-Patchwork-Id: 11669567 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3951760D for ; Fri, 17 Jul 2020 09:03:33 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 116C0207FB for ; Fri, 17 Jul 2020 09:03:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="kv2ZimKi"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="eKvpq7Vc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 116C0207FB Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:References:In-Reply-To:Message-Id:Date:Subject:To: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Wq0pbfndatbHdUcd1EIwHk+iBwf6KaBLpcmg4Xubax4=; b=kv2ZimKiWGlHPpyEoCIfhlJ0v2 PDHomiB4kbZLUGuJgLMkPBEIV4n9ng8PdtvbSd9/3GFHF71fFeJTTdnFMi2PdYz5+6kumBKQkynF4 2DOySHR8xM4vuobm7Dli1rQpzrIdYGzb+EijhyyX3uhIzI/v8yqc2URqQ4xuy/d9Nfg6vW8Q7N941 HqKcQxvs6f5I6/lIisCqBMVU0s2A6Z59bEq6X8Xv1zZhgU3WLrCuTSFt7C1qfeJ0qUbEmMc9dPjwW HzJfHinfGJudDqzcW1UOeDx+UqcBTjs02+BWJUtOV6sOV/gq/f0P90FgueeHxoCfYwKGfIOeYsttY OhS5e+fQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jwMG3-0004Iy-59; Fri, 17 Jul 2020 09:02:19 +0000 Received: from mail-wm1-x329.google.com ([2a00:1450:4864:20::329]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jwMG0-0004I8-Pf for linux-arm-kernel@lists.infradead.org; Fri, 17 Jul 2020 09:02:17 +0000 Received: by mail-wm1-x329.google.com with SMTP id g75so13864627wme.5 for ; Fri, 17 Jul 2020 02:02:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=DQl00yYXYwsbpEtRwxsV9i6tqBPWGw0OYdTItL8Npos=; b=eKvpq7Vc+pWXLiZBlozFZ+/crmGW074XhcYNp3r4fmPCGI8tcs9WINywIQKdsPseE2 8ANxuaBJTN/gfFuBoIKiKMD6t/RoizLQC/C5FpqaQuNzoK80pqOr/gkmFMoH6nt0lItv fwm7+63jhaXuoSSeEEcHzQQuQqzfAfoV62LvY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=DQl00yYXYwsbpEtRwxsV9i6tqBPWGw0OYdTItL8Npos=; b=DTBHZVzwnMk8Qv0u1GxbuCxNB8TTaOj+r6+L0bzn0sBp5TfsPnj99qpZ8X6qWDVkQD 0W9Ny3XaIhxZKW77XCddw+2hVJG+xY0c/VvWrhzIME0KyMG//T4ru7JBMFqdSDQzgb24 Hb89AYltvGROyLIllDPB/6TwXci6hHZw8RD5xJO/6kp1Ao+5b0zwlj7Vu31vhRJfcZyB tm1C0YrhbdOmYYHMkMGgddEZSX3RqarAqRCbtztViBBZZmfRl8xvw+HrIhrnVfXEv23W Cr/9BRD15OqZMAPbWnW/wh9csqcVpjpPdHVkNQ5DtIEma7S57SVJ4Zqh3JXGv/KkaXDj 0Lrg== X-Gm-Message-State: AOAM533NJh8JryX+VWSEe/sIv48RPTpwByf0/0QAyC+WBWzyA2XMIuRz 7TBCIGqpxZda+dACB+RREZxYuQ== X-Google-Smtp-Source: ABdhPJxkxy6FlQOiuxDgHDw4Xc4tE6UUCy+720USQNgwde4/nwbXPW0bbDuGrlGPXgKWc23kFw+LHw== X-Received: by 2002:a1c:48d:: with SMTP id 135mr8559807wme.102.1594976535435; Fri, 17 Jul 2020 02:02:15 -0700 (PDT) Received: from rayagonda.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id w7sm12360705wmc.32.2020.07.17.02.02.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Jul 2020 02:02:14 -0700 (PDT) From: Rayagonda Kokatanur To: Wolfram Sang , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Lori Hikichi , Robert Richter , Nishka Dasgupta , Andy Shevchenko , linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 1/2] i2c: add PEC error event Date: Fri, 17 Jul 2020 14:31:54 +0530 Message-Id: <20200717090155.10383-2-rayagonda.kokatanur@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200717090155.10383-1-rayagonda.kokatanur@broadcom.com> References: <20200717090155.10383-1-rayagonda.kokatanur@broadcom.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200717_050216_925060_DD51F200 X-CRM114-Status: GOOD ( 11.33 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:329 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rayagonda Kokatanur MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add new event I2C_SLAVE_PEC_ERR to list of slave events. This event will be used by slave bus driver to indicate PEC error to slave client or backend driver. Signed-off-by: Rayagonda Kokatanur --- include/linux/i2c.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/i2c.h b/include/linux/i2c.h index b8b8963f8bb9..e04acd04eb48 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -370,6 +370,7 @@ enum i2c_slave_event { I2C_SLAVE_READ_PROCESSED, I2C_SLAVE_WRITE_RECEIVED, I2C_SLAVE_STOP, + I2C_SLAVE_PEC_ERR, }; int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb); From patchwork Fri Jul 17 09:01:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rayagonda Kokatanur X-Patchwork-Id: 11669569 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8388860D for ; Fri, 17 Jul 2020 09:03:43 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5B376207FB for ; Fri, 17 Jul 2020 09:03:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="sVp1I85p"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="I+dyJzmv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5B376207FB Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:References:In-Reply-To:Message-Id:Date:Subject:To: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=OqVv/5XEQs++JtmEbTZRxpsWtWqfyKoWwzuhYU+mQ0g=; b=sVp1I85pxqGAH6W7acjEldGphd GiWCD2Cjg9eLomsnQRX4Egv7R0CZSp/xFEy1OI7RgfV4ooNp/hqRUqdSndM9kCDPbXpiyKg48hplV l1AJSwwVmPiIuegDXr5QQFNxih4AM82+BgL4TbBdK2CkUlkqbNXFfXRt0b7sVIv4b9tHgWqgOU3+E z1VuFLeICZnDu73pB88DbxqV5nGydk0XTZIto05IgNMenRE+pHy1uf6qVvq7e3n/uYLKNWz0Shkpq 6+XKigZSpSKxM+TogInwr+0TWMc0UO+TBQP8RyiF2y74I+ggZ/LoSgRBinuVGixAGER/U++abUBao snInijFg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jwMGA-0004LN-Rq; Fri, 17 Jul 2020 09:02:26 +0000 Received: from mail-wr1-x441.google.com ([2a00:1450:4864:20::441]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jwMG7-0004K7-9w for linux-arm-kernel@lists.infradead.org; Fri, 17 Jul 2020 09:02:24 +0000 Received: by mail-wr1-x441.google.com with SMTP id z15so10166536wrl.8 for ; Fri, 17 Jul 2020 02:02:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=lOFGBT6nwlFy0K7Ws6AFSkHqfysSAoC6A9Svh8/QEaE=; b=I+dyJzmvgNapS+HZBn0cj8uQT6TcP/EpgOQWPNLIxDpFpvDL0KTg370JTPJywBn0HI pjyVjokB+jJQC5kojB5YkrMyhKBhMu4NUxZ15fCyYr2R+91ooLseg6rCTZFtANPHAfTP 2urkeGfKYlD6dNC15mTsREoriTyXUTIMkvOFM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=lOFGBT6nwlFy0K7Ws6AFSkHqfysSAoC6A9Svh8/QEaE=; b=gUPCF4l/ITLtlQKftNWeefy1mXrw2WWMqapaHHb1i+0QwuCwMGZ6kpOvhn5gucFQOz xyFh/V3kEji70icFyzQpqH80gft5YX+BEypRmJuWBYSBp4EV6o2ZyO2+cwrLCrASUCjM JE575KElJ63wqe3WMCbMQKRHCl48n/z5iaLLgAcvwifd1Cg0DoXOJW5J+PDljFV3a6vd ohLMQBVMiSGgqKOxpUEJTn7JvkpVbw2iP46sTfekvogfCkxLJcuuTr2vmWzk2/mp3Guh u7upQI2i31Qo1oMUxBT+1JzyV3HnnuWBtjzEtPclWezDukaCschNY7iKJsoX9NdcJUxU TXvQ== X-Gm-Message-State: AOAM532hcXQJqxiOCGKDcUq/5BOGJPyzX/2bKK2W5kioTYDTUasFdgle YFTg6/9KoSm+tQzRlKw3+gRw7Q== X-Google-Smtp-Source: ABdhPJwkv3GP+yoO3aa/iB4f6cPcSvVw1dbgZ9MfmiPOeUBDzWZ8OJvFBpiqSmc2rP6fWRRYfcIk0w== X-Received: by 2002:adf:e3c5:: with SMTP id k5mr9415590wrm.121.1594976542001; Fri, 17 Jul 2020 02:02:22 -0700 (PDT) Received: from rayagonda.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id w7sm12360705wmc.32.2020.07.17.02.02.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Jul 2020 02:02:21 -0700 (PDT) From: Rayagonda Kokatanur To: Wolfram Sang , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Lori Hikichi , Robert Richter , Nishka Dasgupta , Andy Shevchenko , linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 2/2] i2c: iproc: add slave pec support Date: Fri, 17 Jul 2020 14:31:55 +0530 Message-Id: <20200717090155.10383-3-rayagonda.kokatanur@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200717090155.10383-1-rayagonda.kokatanur@broadcom.com> References: <20200717090155.10383-1-rayagonda.kokatanur@broadcom.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200717_050223_361301_7FF651E9 X-CRM114-Status: GOOD ( 17.70 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:441 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rayagonda Kokatanur MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Iproc supports PEC computation and checking in both Master and Slave mode. This patch adds support for PEC in slave mode. As per hw spec, PEC ERROR status bits are [29:28] in S_RX_OFFSET register, hence this patch corrects the S_RX_PEC_ERR_SHIFT. Signed-off-by: Rayagonda Kokatanur --- Changes from v1: -Address review comments from Andy Shevchenko Update commit message, Rewrite bcm_iproc_smbus_check_slave_pec() to remove local variable ret and type casting, Use positive condition. drivers/i2c/busses/i2c-bcm-iproc.c | 49 +++++++++++++++++++++++++++--- 1 file changed, 45 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c index 8a3c98866fb7..cfa7b044209e 100644 --- a/drivers/i2c/busses/i2c-bcm-iproc.c +++ b/drivers/i2c/busses/i2c-bcm-iproc.c @@ -93,6 +93,7 @@ #define S_CMD_STATUS_MASK 0x07 #define S_CMD_STATUS_SUCCESS 0x0 #define S_CMD_STATUS_TIMEOUT 0x5 +#define S_CMD_PEC_SHIFT 8 #define IE_OFFSET 0x38 #define IE_M_RX_FIFO_FULL_SHIFT 31 @@ -138,7 +139,9 @@ #define S_RX_OFFSET 0x4c #define S_RX_STATUS_SHIFT 30 #define S_RX_STATUS_MASK 0x03 -#define S_RX_PEC_ERR_SHIFT 29 +#define S_RX_PEC_ERR_SHIFT 28 +#define S_RX_PEC_ERR_MASK 0x3 +#define S_RX_PEC_ERR 0x1 #define S_RX_DATA_SHIFT 0 #define S_RX_DATA_MASK 0xff @@ -205,6 +208,8 @@ struct bcm_iproc_i2c_dev { /* bytes that have been read */ unsigned int rx_bytes; unsigned int thld_bytes; + + bool en_s_pec; }; /* @@ -321,6 +326,23 @@ static void bcm_iproc_i2c_check_slave_status( } } +static int bcm_iproc_smbus_check_slave_pec(struct bcm_iproc_i2c_dev *iproc_i2c, + u32 val) +{ + u8 err_status; + + if (!iproc_i2c->en_s_pec) + return 0; + + err_status = (val >> S_RX_PEC_ERR_SHIFT) & S_RX_PEC_ERR_MASK; + if (err_status == S_RX_PEC_ERR) { + dev_err(iproc_i2c->device, "Slave PEC error\n"); + return -EBADMSG; + } + + return 0; +} + static bool bcm_iproc_i2c_slave_isr(struct bcm_iproc_i2c_dev *iproc_i2c, u32 status) { @@ -347,6 +369,8 @@ static bool bcm_iproc_i2c_slave_isr(struct bcm_iproc_i2c_dev *iproc_i2c, iproc_i2c_wr_reg(iproc_i2c, S_TX_OFFSET, value); val = BIT(S_CMD_START_BUSY_SHIFT); + if (iproc_i2c->en_s_pec) + val |= BIT(S_CMD_PEC_SHIFT); iproc_i2c_wr_reg(iproc_i2c, S_CMD_OFFSET, val); /* @@ -361,9 +385,19 @@ static bool bcm_iproc_i2c_slave_isr(struct bcm_iproc_i2c_dev *iproc_i2c, value = (u8)((val >> S_RX_DATA_SHIFT) & S_RX_DATA_MASK); i2c_slave_event(iproc_i2c->slave, I2C_SLAVE_WRITE_RECEIVED, &value); - if (rx_status == I2C_SLAVE_RX_END) - i2c_slave_event(iproc_i2c->slave, - I2C_SLAVE_STOP, &value); + if (rx_status == I2C_SLAVE_RX_END) { + int ret; + + ret = bcm_iproc_smbus_check_slave_pec(iproc_i2c, + val); + if (ret) + i2c_slave_event(iproc_i2c->slave, + I2C_SLAVE_PEC_ERR, + &value); + else + i2c_slave_event(iproc_i2c->slave, + I2C_SLAVE_STOP, &value); + } } } else if (status & BIT(IS_S_TX_UNDERRUN_SHIFT)) { /* Master read other than start */ @@ -372,6 +406,8 @@ static bool bcm_iproc_i2c_slave_isr(struct bcm_iproc_i2c_dev *iproc_i2c, iproc_i2c_wr_reg(iproc_i2c, S_TX_OFFSET, value); val = BIT(S_CMD_START_BUSY_SHIFT); + if (iproc_i2c->en_s_pec) + val |= BIT(S_CMD_PEC_SHIFT); iproc_i2c_wr_reg(iproc_i2c, S_CMD_OFFSET, val); } @@ -1065,6 +1101,11 @@ static int bcm_iproc_i2c_reg_slave(struct i2c_client *slave) if (slave->flags & I2C_CLIENT_TEN) return -EAFNOSUPPORT; + /* Enable partial slave HW PEC support if requested by the client */ + iproc_i2c->en_s_pec = !!(slave->flags & I2C_CLIENT_PEC); + if (iproc_i2c->en_s_pec) + dev_info(iproc_i2c->device, "Enable PEC\n"); + iproc_i2c->slave = slave; bcm_iproc_i2c_slave_init(iproc_i2c, false); return 0;