From patchwork Thu Aug 29 09:24:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mukesh Kumar Savaliya X-Patchwork-Id: 824120 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 562C918E03E; Thu, 29 Aug 2024 09:26:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724923569; cv=none; b=VvTethCUEqhTSQ+NXkyvu3AcHrtNX22/81Z3E6UlCd0tSi20y43eu2xmE2KfcTuNDdLnqTbiAF7XxpQFpnvm7VJzwav+9GczHi4I0mIhuxqzEn++a61PubocH9jiAZtJsYHdPyf6aOW8uM8Y0WQucfhiPHGKef6fdPe2prBRCIA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724923569; c=relaxed/simple; bh=zSeBAp0hmSiRgeHNXM6imG1h0GTKbRqot9nZL4u8PR0=; 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Thu, 29 Aug 2024 09:25:59 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 4178kmcgj5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 29 Aug 2024 09:25:59 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 47T9PxHg019318; Thu, 29 Aug 2024 09:25:59 GMT Received: from hu-maiyas-hyd.qualcomm.com (hu-msavaliy-hyd.qualcomm.com [10.213.110.207]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 47T9PwRV019179 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 29 Aug 2024 09:25:59 +0000 Received: by hu-maiyas-hyd.qualcomm.com (Postfix, from userid 429934) id 3715B242FD; Thu, 29 Aug 2024 14:55:58 +0530 (+0530) From: Mukesh Kumar Savaliya To: konrad.dybcio@linaro.org, andersson@kernel.org, andi.shyti@kernel.org, linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org Cc: quic_vdadhani@quicinc.com, Mukesh Kumar Savaliya Subject: [PATCH v1 2/4] dma: gpi: Add Lock and Unlock TRE support to access SE exclusively Date: Thu, 29 Aug 2024 14:54:16 +0530 Message-Id: <20240829092418.2863659-3-quic_msavaliy@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240829092418.2863659-1-quic_msavaliy@quicinc.com> References: <20240829092418.2863659-1-quic_msavaliy@quicinc.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: _Yb4MZH-ItfjeFrfF_4pzOKlTmTdscRm X-Proofpoint-ORIG-GUID: _Yb4MZH-ItfjeFrfF_4pzOKlTmTdscRm X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-29_02,2024-08-29_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 bulkscore=0 mlxlogscore=999 impostorscore=0 malwarescore=0 spamscore=0 phishscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2408290069 GSI DMA provides specific TREs namely Lock and Unlock TRE, which provides mutual exclusive access to SE from any of the subsystem (E.g. Apps, TZ, ADSP etc). Lock prevents other subsystems from concurrently performing DMA transfers and avoids disturbance to data path. Basically lock the SE for particular subsystem, complete the transfer, unlock the SE. Apply Lock TRE for the first transfer of shared SE and Apply Unlock TRE for the last transfer. Also change MAX_TRE macro to 5 from 3 because of the two additional TREs. Signed-off-by: Mukesh Kumar Savaliya --- drivers/dma/qcom/gpi.c | 37 +++++++++++++++++++++++++++++++- include/linux/dma/qcom-gpi-dma.h | 6 ++++++ 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/drivers/dma/qcom/gpi.c b/drivers/dma/qcom/gpi.c index e6ebd688d746..ba11b2641ab6 100644 --- a/drivers/dma/qcom/gpi.c +++ b/drivers/dma/qcom/gpi.c @@ -2,6 +2,7 @@ /* * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved. * Copyright (c) 2020, Linaro Limited + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. */ #include @@ -65,6 +66,14 @@ /* DMA TRE */ #define TRE_DMA_LEN GENMASK(23, 0) +/* Lock TRE */ +#define TRE_I2C_LOCK BIT(0) +#define TRE_MINOR_TYPE GENMASK(19, 16) +#define TRE_MAJOR_TYPE GENMASK(23, 20) + +/* Unlock TRE */ +#define TRE_I2C_UNLOCK BIT(8) + /* Register offsets from gpi-top */ #define GPII_n_CH_k_CNTXT_0_OFFS(n, k) (0x20000 + (0x4000 * (n)) + (0x80 * (k))) #define GPII_n_CH_k_CNTXT_0_EL_SIZE GENMASK(31, 24) @@ -516,7 +525,7 @@ struct gpii { bool ieob_set; }; -#define MAX_TRE 3 +#define MAX_TRE 5 struct gpi_desc { struct virt_dma_desc vd; @@ -1637,6 +1646,19 @@ static int gpi_create_i2c_tre(struct gchan *chan, struct gpi_desc *desc, struct gpi_tre *tre; unsigned int i; + /* create lock tre for first tranfser */ + if (i2c->shared_se && i2c->first_msg) { + tre = &desc->tre[tre_idx]; + tre_idx++; + + tre->dword[0] = 0; + tre->dword[1] = 0; + tre->dword[2] = 0; + tre->dword[3] = u32_encode_bits(1, TRE_I2C_LOCK); + tre->dword[3] |= u32_encode_bits(0, TRE_MINOR_TYPE); + tre->dword[3] |= u32_encode_bits(3, TRE_MAJOR_TYPE); + } + /* first create config tre if applicable */ if (i2c->set_config) { tre = &desc->tre[tre_idx]; @@ -1695,6 +1717,19 @@ static int gpi_create_i2c_tre(struct gchan *chan, struct gpi_desc *desc, tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOT); } + /* Unlock tre for last transfer */ + if (i2c->shared_se && i2c->last_msg && i2c->op != I2C_READ) { + tre = &desc->tre[tre_idx]; + tre_idx++; + + tre->dword[0] = 0; + tre->dword[1] = 0; + tre->dword[2] = 0; + tre->dword[3] = u32_encode_bits(1, TRE_I2C_UNLOCK); + tre->dword[3] |= u32_encode_bits(1, TRE_MINOR_TYPE); + tre->dword[3] |= u32_encode_bits(3, TRE_MAJOR_TYPE); + } + for (i = 0; i < tre_idx; i++) dev_dbg(dev, "TRE:%d %x:%x:%x:%x\n", i, desc->tre[i].dword[0], desc->tre[i].dword[1], desc->tre[i].dword[2], desc->tre[i].dword[3]); diff --git a/include/linux/dma/qcom-gpi-dma.h b/include/linux/dma/qcom-gpi-dma.h index 6680dd1a43c6..8589c711afae 100644 --- a/include/linux/dma/qcom-gpi-dma.h +++ b/include/linux/dma/qcom-gpi-dma.h @@ -65,6 +65,9 @@ enum i2c_op { * @rx_len: receive length for buffer * @op: i2c cmd * @muli-msg: is part of multi i2c r-w msgs + * @shared_se: bus is shared between subsystems + * @bool first_msg: use it for tracking multimessage xfer + * @bool last_msg: use it for tracking multimessage xfer */ struct gpi_i2c_config { u8 set_config; @@ -78,6 +81,9 @@ struct gpi_i2c_config { u32 rx_len; enum i2c_op op; bool multi_msg; + bool shared_se; + bool first_msg; + bool last_msg; }; #endif /* QCOM_GPI_DMA_H */ From patchwork Thu Aug 29 09:24:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mukesh Kumar Savaliya X-Patchwork-Id: 824119 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 73B5118DF94; Thu, 29 Aug 2024 09:26:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724923579; cv=none; b=buMhjukQncQuUgiC52F/5XQT7ZZoktjI6axUsRHW9dHhhzJTCvbS2E4zj2pCvj91ZKA2kv3gcWTpLly0anCKPKpdtZK7ppESvUKEN6UCp482CLOJJ9/riI0d9Dqz5FGeHbyPUSdncWEunDerPtv1KFjXBsEDl06/0zyuYYQR7Ss= ARC-Message-Signature: i=1; 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Thu, 29 Aug 2024 09:26:10 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 4178kmcgmm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 29 Aug 2024 09:26:10 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 47T9Q2X5019351; Thu, 29 Aug 2024 09:26:10 GMT Received: from hu-maiyas-hyd.qualcomm.com (hu-msavaliy-hyd.qualcomm.com [10.213.110.207]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 47T9Q9Br019426 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 29 Aug 2024 09:26:10 +0000 Received: by hu-maiyas-hyd.qualcomm.com (Postfix, from userid 429934) id DAEEF242FD; Thu, 29 Aug 2024 14:56:08 +0530 (+0530) From: Mukesh Kumar Savaliya To: konrad.dybcio@linaro.org, andersson@kernel.org, andi.shyti@kernel.org, linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org Cc: quic_vdadhani@quicinc.com, Mukesh Kumar Savaliya Subject: [PATCH v1 4/4] i2c: i2c-qcom-geni: Enable i2c controller sharing between two subsystems Date: Thu, 29 Aug 2024 14:54:18 +0530 Message-Id: <20240829092418.2863659-5-quic_msavaliy@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240829092418.2863659-1-quic_msavaliy@quicinc.com> References: <20240829092418.2863659-1-quic_msavaliy@quicinc.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: hyrKRq-Nfoh8TtgE-h8UfBcCI7jn7QTC X-Proofpoint-ORIG-GUID: hyrKRq-Nfoh8TtgE-h8UfBcCI7jn7QTC X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-29_02,2024-08-29_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=999 bulkscore=0 impostorscore=0 phishscore=0 clxscore=1015 mlxscore=0 spamscore=0 suspectscore=0 malwarescore=0 adultscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2408290069 Add support to share I2C SE by two Subsystems in a mutually exclusive way. Use "qcom,shared-se" flag in a particular i2c instance node if the usecase requires i2c controller to be shared. I2C driver just need to mark first_msg and last_msg flag to help indicate GPI driver to take lock and unlock TRE there by protecting from concurrent access from other EE or Subsystem. gpi_create_i2c_tre() function at gpi.c will take care of adding Lock and Unlock TRE for the respective transfer operations. Since the GPIOs are also shared for the i2c bus between two SS, do not touch GPIO configuration during runtime suspend and only turn off the clocks. This will allow other SS to continue to transfer the data without any disturbance over the IO lines. Signed-off-by: Mukesh Kumar Savaliya --- drivers/i2c/busses/i2c-qcom-geni.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index eebb0cbb6ca4..ee2e431601a6 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved. +// Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. #include #include @@ -99,6 +100,7 @@ struct geni_i2c_dev { struct dma_chan *rx_c; bool gpi_mode; bool abort_done; + bool is_shared; }; struct geni_i2c_desc { @@ -602,6 +604,7 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i peripheral.clk_div = itr->clk_div; peripheral.set_config = 1; peripheral.multi_msg = false; + peripheral.shared_se = gi2c->is_shared; for (i = 0; i < num; i++) { gi2c->cur = &msgs[i]; @@ -612,6 +615,8 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i if (i < num - 1) peripheral.stretch = 1; + peripheral.first_msg = (i == 0); + peripheral.last_msg = (i == num - 1); peripheral.addr = msgs[i].addr; ret = geni_i2c_gpi(gi2c, &msgs[i], &config, @@ -631,8 +636,11 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i dma_async_issue_pending(gi2c->tx_c); time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT); - if (!time_left) + if (!time_left) { + dev_err(gi2c->se.dev, "I2C timeout gpi flags:%d addr:0x%x\n", + gi2c->cur->flags, gi2c->cur->addr); gi2c->err = -ETIMEDOUT; + } if (gi2c->err) { ret = gi2c->err; @@ -800,6 +808,11 @@ static int geni_i2c_probe(struct platform_device *pdev) gi2c->clk_freq_out = KHZ(100); } + if (of_property_read_bool(pdev->dev.of_node, "qcom,shared-se")) { + gi2c->is_shared = true; + dev_dbg(&pdev->dev, "Shared SE Usecase\n"); + } + if (has_acpi_companion(dev)) ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(dev)); @@ -962,14 +975,16 @@ static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev) struct geni_i2c_dev *gi2c = dev_get_drvdata(dev); disable_irq(gi2c->irq); - ret = geni_se_resources_off(&gi2c->se); - if (ret) { - enable_irq(gi2c->irq); - return ret; - + if (gi2c->is_shared) { + geni_se_clks_off(&gi2c->se); } else { - gi2c->suspended = 1; + ret = geni_se_resources_off(&gi2c->se); + if (ret) { + enable_irq(gi2c->irq); + return ret; + } } + gi2c->suspended = 1; clk_disable_unprepare(gi2c->core_clk);