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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 Thu Jul 16 08:08:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rayagonda Kokatanur X-Patchwork-Id: 11666839 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 484101392 for ; Thu, 16 Jul 2020 08:10:39 +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 20EB12065D for ; 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Thu, 16 Jul 2020 01:08:59 -0700 (PDT) Received: from rayagonda.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id a3sm4353085pgd.73.2020.07.16.01.08.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jul 2020 01:08:58 -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 V1 2/2] i2c: iproc: add slave pec support Date: Thu, 16 Jul 2020 13:38:36 +0530 Message-Id: <20200716080836.2279-3-rayagonda.kokatanur@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200716080836.2279-1-rayagonda.kokatanur@broadcom.com> References: <20200716080836.2279-1-rayagonda.kokatanur@broadcom.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200716_040901_897400_17BC97F8 X-CRM114-Status: GOOD ( 17.03 ) 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 [2607:f8b0:4864:20:0:0:0:544 listed in] [list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -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. Signed-off-by: Rayagonda Kokatanur --- drivers/i2c/busses/i2c-bcm-iproc.c | 50 +++++++++++++++++++++++++++--- 1 file changed, 46 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c index 8a3c98866fb7..51c8b165bb5e 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 +326,24 @@ 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; + int ret = 0; + + if (!iproc_i2c->en_s_pec) + return ret; + + err_status = (u8)((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"); + ret = -EBADMSG; + } + + return ret; +} + static bool bcm_iproc_i2c_slave_isr(struct bcm_iproc_i2c_dev *iproc_i2c, u32 status) { @@ -347,6 +370,8 @@ 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 +386,19 @@ 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_STOP, &value); + else + i2c_slave_event(iproc_i2c->slave, + I2C_SLAVE_PEC_ERR, + &value); + } } } else if (status & BIT(IS_S_TX_UNDERRUN_SHIFT)) { /* Master read other than start */ @@ -372,6 +407,8 @@ 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 +1102,11 @@ 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;