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Wed, 21 Aug 2024 17:09:51 GMT Received: from adas-linux5.qualcomm.com (10.80.80.8) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Wed, 21 Aug 2024 10:09:50 -0700 From: Shashank Babu Chinta Venkata To: , , , CC: , , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Manivannan Sadhasivam , "Rob Herring" , Bjorn Helgaas , Jingoo Han , Yoshihiro Shimoda , Serge Semin , Niklas Cassel , Conor Dooley , , , Subject: [PATCH v5 1/3] PCI: qcom: Refactor common code Date: Wed, 21 Aug 2024 10:08:42 -0700 Message-ID: <20240821170917.21018-2-quic_schintav@quicinc.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240821170917.21018-1-quic_schintav@quicinc.com> References: <20240821170917.21018-1-quic_schintav@quicinc.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: n0LHcqpHh-mFlGDkY9Lau6KvRNuzdwL0 X-Proofpoint-ORIG-GUID: n0LHcqpHh-mFlGDkY9Lau6KvRNuzdwL0 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=2024-08-21_11,2024-08-19_03,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 phishscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2408210124 Refactor common code from RC(Root Complex) and EP(End Point) drivers and move them to a common driver. This acts as placeholder for common source code for both drivers, thus avoiding duplication. Signed-off-by: Shashank Babu Chinta Venkata --- MAINTAINERS | 3 + drivers/pci/controller/dwc/Kconfig | 5 + drivers/pci/controller/dwc/Makefile | 1 + drivers/pci/controller/dwc/pcie-qcom-common.c | 88 +++++++++++ drivers/pci/controller/dwc/pcie-qcom-common.h | 15 ++ drivers/pci/controller/dwc/pcie-qcom-ep.c | 39 +---- drivers/pci/controller/dwc/pcie-qcom.c | 141 ++++++------------ 7 files changed, 161 insertions(+), 131 deletions(-) create mode 100644 drivers/pci/controller/dwc/pcie-qcom-common.c create mode 100644 drivers/pci/controller/dwc/pcie-qcom-common.h diff --git a/MAINTAINERS b/MAINTAINERS index c0a62489be56..ef3e62677e9f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2785,6 +2785,7 @@ F: drivers/iommu/msm* F: drivers/mfd/ssbi.c F: drivers/mmc/host/mmci_qcom* F: drivers/mmc/host/sdhci-msm.c +F: drivers/pci/controller/dwc/pcie-qcom-common.c F: drivers/pci/controller/dwc/pcie-qcom.c F: drivers/phy/qualcomm/ F: drivers/power/*/msm* @@ -17844,6 +17845,7 @@ M: Manivannan Sadhasivam L: linux-pci@vger.kernel.org L: linux-arm-msm@vger.kernel.org S: Maintained +F: drivers/pci/controller/dwc/pcie-qcom-common.c F: drivers/pci/controller/dwc/pcie-qcom.c PCIE DRIVER FOR ROCKCHIP @@ -17880,6 +17882,7 @@ L: linux-pci@vger.kernel.org L: linux-arm-msm@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml +F: drivers/pci/controller/dwc/pcie-qcom-common.c F: drivers/pci/controller/dwc/pcie-qcom-ep.c PCMCIA SUBSYSTEM diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig index 4c38181acffa..b6d6778b0698 100644 --- a/drivers/pci/controller/dwc/Kconfig +++ b/drivers/pci/controller/dwc/Kconfig @@ -265,12 +265,16 @@ config PCIE_DW_PLAT_EP order to enable device-specific features PCI_DW_PLAT_EP must be selected. +config PCIE_QCOM_COMMON + bool + config PCIE_QCOM bool "Qualcomm PCIe controller (host mode)" depends on OF && (ARCH_QCOM || COMPILE_TEST) depends on PCI_MSI select PCIE_DW_HOST select CRC8 + select PCIE_QCOM_COMMON help Say Y here to enable PCIe controller support on Qualcomm SoCs. The PCIe controller uses the DesignWare core plus Qualcomm-specific @@ -281,6 +285,7 @@ config PCIE_QCOM_EP depends on OF && (ARCH_QCOM || COMPILE_TEST) depends on PCI_ENDPOINT select PCIE_DW_EP + select PCIE_QCOM_COMMON help Say Y here to enable support for the PCIe controllers on Qualcomm SoCs to work in endpoint mode. The PCIe controller uses the DesignWare core diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile index ec215b3d6191..82e51ba11031 100644 --- a/drivers/pci/controller/dwc/Makefile +++ b/drivers/pci/controller/dwc/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o obj-$(CONFIG_PCI_LAYERSCAPE_EP) += pci-layerscape-ep.o obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o obj-$(CONFIG_PCIE_QCOM_EP) += pcie-qcom-ep.o +obj-$(CONFIG_PCIE_QCOM_COMMON) += pcie-qcom-common.o obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o obj-$(CONFIG_PCIE_ROCKCHIP_DW) += pcie-dw-rockchip.o diff --git a/drivers/pci/controller/dwc/pcie-qcom-common.c b/drivers/pci/controller/dwc/pcie-qcom-common.c new file mode 100644 index 000000000000..1d8992147bba --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-qcom-common.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2014-2015, 2020 The Linux Foundation. All rights reserved. + * Copyright (c) 2015, 2021 Linaro Limited. + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. + * + */ + +#include +#include +#include +#include + +#include "../../pci.h" +#include "pcie-designware.h" +#include "pcie-qcom-common.h" + +struct icc_path *qcom_pcie_common_icc_get_resource(struct dw_pcie *pci, const char *path) +{ + struct icc_path *icc_p; + + icc_p = devm_of_icc_get(pci->dev, path); + return icc_p; +} +EXPORT_SYMBOL_GPL(qcom_pcie_common_icc_get_resource); + +int qcom_pcie_common_icc_init(struct dw_pcie *pci, struct icc_path *icc, u32 bandwidth) +{ + int ret; + + ret = icc_set_bw(icc, 0, bandwidth); + if (ret) { + dev_err(pci->dev, "Failed to set interconnect bandwidth: %d\n", + ret); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(qcom_pcie_common_icc_init); + +void qcom_pcie_common_icc_update(struct dw_pcie *pci, struct icc_path *icc_mem) +{ + u32 offset, status, width, speed; + unsigned long freq_kbps; + struct dev_pm_opp *opp; + int ret, freq_mbps; + + if (!icc_mem) + return; + + offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA); + + /* Only update constraints if link is up. */ + if (!(status & PCI_EXP_LNKSTA_DLLLA)) + return; + + speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status); + width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status); + + if (icc_mem) { + ret = icc_set_bw(icc_mem, 0, + width * QCOM_PCIE_LINK_SPEED_TO_BW(speed)); + if (ret) { + dev_err(pci->dev, "Failed to set bandwidth for PCIe-MEM interconnect path: %d\n", + ret); + } + } else { + freq_mbps = pcie_dev_speed_mbps(pcie_link_speed[speed]); + if (freq_mbps < 0) + return; + + freq_kbps = freq_mbps * KILO; + opp = dev_pm_opp_find_freq_exact(pci->dev, freq_kbps * width, + true); + if (!IS_ERR(opp)) { + ret = dev_pm_opp_set_opp(pci->dev, opp); + if (ret) + dev_err(pci->dev, "Failed to set OPP for freq (%lu): %d\n", + freq_kbps * width, ret); + dev_pm_opp_put(opp); + } + + } + +} +EXPORT_SYMBOL_GPL(qcom_pcie_common_icc_update); diff --git a/drivers/pci/controller/dwc/pcie-qcom-common.h b/drivers/pci/controller/dwc/pcie-qcom-common.h new file mode 100644 index 000000000000..897fa18e618a --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-qcom-common.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2014-2015, 2020 The Linux Foundation. All rights reserved. + * Copyright (c) 2015, 2021 Linaro Limited. + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include "pcie-designware.h" + +#define QCOM_PCIE_LINK_SPEED_TO_BW(speed) \ + Mbps_to_icc(PCIE_SPEED2MBS_ENC(pcie_link_speed[speed])) + +struct icc_path *qcom_pcie_common_icc_get_resource(struct dw_pcie *pci, const char *path); +int qcom_pcie_common_icc_init(struct dw_pcie *pci, struct icc_path *icc_mem, u32 bandwidth); +void qcom_pcie_common_icc_update(struct dw_pcie *pci, struct icc_path *icc_mem); diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 236229f66c80..e1860026e134 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -25,6 +25,7 @@ #include "../../pci.h" #include "pcie-designware.h" +#include "pcie-qcom-common.h" /* PARF registers */ #define PARF_SYS_CTRL 0x00 @@ -142,9 +143,6 @@ #define CORE_RESET_TIME_US_MAX 1005 #define WAKE_DELAY_US 2000 /* 2 ms */ -#define QCOM_PCIE_LINK_SPEED_TO_BW(speed) \ - Mbps_to_icc(PCIE_SPEED2MBS_ENC(pcie_link_speed[speed])) - #define to_pcie_ep(x) dev_get_drvdata((x)->dev) enum qcom_pcie_ep_link_status { @@ -295,28 +293,6 @@ static void qcom_pcie_dw_write_dbi2(struct dw_pcie *pci, void __iomem *base, writel(0, pcie_ep->elbi + ELBI_CS2_ENABLE); } -static void qcom_pcie_ep_icc_update(struct qcom_pcie_ep *pcie_ep) -{ - struct dw_pcie *pci = &pcie_ep->pci; - u32 offset, status; - int speed, width; - int ret; - - if (!pcie_ep->icc_mem) - return; - - offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); - status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA); - - speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status); - width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status); - - ret = icc_set_bw(pcie_ep->icc_mem, 0, width * QCOM_PCIE_LINK_SPEED_TO_BW(speed)); - if (ret) - dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", - ret); -} - static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep) { struct dw_pcie *pci = &pcie_ep->pci; @@ -342,14 +318,7 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep) if (ret) goto err_phy_exit; - /* - * Some Qualcomm platforms require interconnect bandwidth constraints - * to be set before enabling interconnect clocks. - * - * Set an initial peak bandwidth corresponding to single-lane Gen 1 - * for the pcie-mem path. - */ - ret = icc_set_bw(pcie_ep->icc_mem, 0, QCOM_PCIE_LINK_SPEED_TO_BW(1)); + ret = qcom_pcie_common_icc_init(pci, pcie_ep->icc_mem); if (ret) { dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", ret); @@ -633,7 +602,7 @@ static int qcom_pcie_ep_get_resources(struct platform_device *pdev, if (IS_ERR(pcie_ep->phy)) ret = PTR_ERR(pcie_ep->phy); - pcie_ep->icc_mem = devm_of_icc_get(dev, "pcie-mem"); + pcie_ep->icc_mem = qcom_pcie_common_icc_get_resource(&pcie_ep->pci, "pcie-mem"); if (IS_ERR(pcie_ep->icc_mem)) ret = PTR_ERR(pcie_ep->icc_mem); @@ -660,7 +629,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data) } else if (FIELD_GET(PARF_INT_ALL_BME, status)) { dev_dbg(dev, "Received Bus Master Enable event\n"); pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED; - qcom_pcie_ep_icc_update(pcie_ep); + qcom_pcie_common_icc_update(pci, pcie_ep->icc_mem); pci_epc_bus_master_enable_notify(pci->ep.epc); } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) { dev_dbg(dev, "Received PM Turn-off event! Entering L23\n"); diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 0180edf3310e..ee32590f1506 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -31,9 +31,9 @@ #include #include #include -#include #include "../../pci.h" +#include "pcie-qcom-common.h" #include "pcie-designware.h" /* PARF registers */ @@ -158,9 +158,6 @@ #define QCOM_PCIE_CRC8_POLYNOMIAL (BIT(2) | BIT(1) | BIT(0)) -#define QCOM_PCIE_LINK_SPEED_TO_BW(speed) \ - Mbps_to_icc(PCIE_SPEED2MBS_ENC(pcie_link_speed[speed])) - struct qcom_pcie_resources_1_0_0 { struct clk_bulk_data *clks; int num_clks; @@ -1365,92 +1362,6 @@ static const struct dw_pcie_ops dw_pcie_ops = { .start_link = qcom_pcie_start_link, }; -static int qcom_pcie_icc_init(struct qcom_pcie *pcie) -{ - struct dw_pcie *pci = pcie->pci; - int ret; - - pcie->icc_mem = devm_of_icc_get(pci->dev, "pcie-mem"); - if (IS_ERR(pcie->icc_mem)) - return PTR_ERR(pcie->icc_mem); - - pcie->icc_cpu = devm_of_icc_get(pci->dev, "cpu-pcie"); - if (IS_ERR(pcie->icc_cpu)) - return PTR_ERR(pcie->icc_cpu); - /* - * Some Qualcomm platforms require interconnect bandwidth constraints - * to be set before enabling interconnect clocks. - * - * Set an initial peak bandwidth corresponding to single-lane Gen 1 - * for the pcie-mem path. - */ - ret = icc_set_bw(pcie->icc_mem, 0, QCOM_PCIE_LINK_SPEED_TO_BW(1)); - if (ret) { - dev_err(pci->dev, "Failed to set bandwidth for PCIe-MEM interconnect path: %d\n", - ret); - return ret; - } - - /* - * Since the CPU-PCIe path is only used for activities like register - * access of the host controller and endpoint Config/BAR space access, - * HW team has recommended to use a minimal bandwidth of 1KBps just to - * keep the path active. - */ - ret = icc_set_bw(pcie->icc_cpu, 0, kBps_to_icc(1)); - if (ret) { - dev_err(pci->dev, "Failed to set bandwidth for CPU-PCIe interconnect path: %d\n", - ret); - icc_set_bw(pcie->icc_mem, 0, 0); - return ret; - } - - return 0; -} - -static void qcom_pcie_icc_opp_update(struct qcom_pcie *pcie) -{ - u32 offset, status, width, speed; - struct dw_pcie *pci = pcie->pci; - unsigned long freq_kbps; - struct dev_pm_opp *opp; - int ret, freq_mbps; - - offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); - status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA); - - /* Only update constraints if link is up. */ - if (!(status & PCI_EXP_LNKSTA_DLLLA)) - return; - - speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status); - width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status); - - if (pcie->icc_mem) { - ret = icc_set_bw(pcie->icc_mem, 0, - width * QCOM_PCIE_LINK_SPEED_TO_BW(speed)); - if (ret) { - dev_err(pci->dev, "Failed to set bandwidth for PCIe-MEM interconnect path: %d\n", - ret); - } - } else { - freq_mbps = pcie_dev_speed_mbps(pcie_link_speed[speed]); - if (freq_mbps < 0) - return; - - freq_kbps = freq_mbps * KILO; - opp = dev_pm_opp_find_freq_exact(pci->dev, freq_kbps * width, - true); - if (!IS_ERR(opp)) { - ret = dev_pm_opp_set_opp(pci->dev, opp); - if (ret) - dev_err(pci->dev, "Failed to set OPP for freq (%lu): %d\n", - freq_kbps * width, ret); - dev_pm_opp_put(opp); - } - } -} - static int qcom_pcie_link_transition_count(struct seq_file *s, void *data) { struct qcom_pcie *pcie = (struct qcom_pcie *)dev_get_drvdata(s->private); @@ -1561,6 +1472,18 @@ static int qcom_pcie_probe(struct platform_device *pdev) goto err_pm_runtime_put; } + pcie->icc_mem = qcom_pcie_common_icc_get_resource(pcie->pci, "pcie-mem"); + if (IS_ERR_OR_NULL(pcie->icc_mem)) { + ret = PTR_ERR(pcie->icc_mem); + goto err_pm_runtime_put; + } + + pcie->icc_cpu = qcom_pcie_common_icc_get_resource(pcie->pci, "cpu-pcie"); + if (IS_ERR_OR_NULL(pcie->icc_cpu)) { + ret = PTR_ERR(pcie->icc_cpu); + goto err_pm_runtime_put; + } + /* OPP table is optional */ ret = devm_pm_opp_of_add_table(dev); if (ret && ret != -ENODEV) { @@ -1593,10 +1516,35 @@ static int qcom_pcie_probe(struct platform_device *pdev) goto err_pm_runtime_put; } } else { - /* Skip ICC init if OPP is supported as it is handled by OPP */ - ret = qcom_pcie_icc_init(pcie); - if (ret) + /* + * Some Qualcomm platforms require interconnect bandwidth + * constraints to be set before enabling interconnect clocks + * Set an initial peak bandwidth corresponding to single-lane + * Gen 1 for the pcie-mem path. + */ + ret = qcom_pcie_common_icc_init(pcie->pci, pcie->icc_mem, + QCOM_PCIE_LINK_SPEED_TO_BW(1)); + if (ret) { + dev_err(pci->dev, + "Failed to set bandwidth for PCIe-MEM interconnect path: %d\n", + ret); goto err_pm_runtime_put; + } + + /* + * Since the CPU-PCIe path is only used for activities + * like register access of the host controller and + * endpoint Config/BAR space access, HW team has + * recommended to use a minimal bandwidth of 1KBps just to + * keep the path active. + */ + ret = qcom_pcie_common_icc_init(pcie->pci, pcie->icc_cpu, kBps_to_icc(1)); + if (ret) { + dev_err(pci->dev, + "Failed to set bandwidth for CPU-PCIe interconnect path: %d\n", + ret); + goto err_pm_runtime_put; + } } ret = pcie->cfg->ops->get_resources(pcie); @@ -1617,7 +1565,7 @@ static int qcom_pcie_probe(struct platform_device *pdev) goto err_phy_exit; } - qcom_pcie_icc_opp_update(pcie); + qcom_pcie_common_icc_update(pcie->pci, pcie->icc_mem); if (pcie->mhi) qcom_pcie_init_debugfs(pcie); @@ -1681,7 +1629,8 @@ static int qcom_pcie_suspend_noirq(struct device *dev) if (pm_suspend_target_state != PM_SUSPEND_MEM) { ret = icc_disable(pcie->icc_cpu); if (ret) - dev_err(dev, "Failed to disable CPU-PCIe interconnect path: %d\n", ret); + dev_err(dev, + "Failed to disable CPU-PCIe interconnect path: %d\n", ret); if (!pcie->icc_mem) dev_pm_opp_set_opp(pcie->pci->dev, NULL); @@ -1710,7 +1659,7 @@ static int qcom_pcie_resume_noirq(struct device *dev) pcie->suspended = false; } - qcom_pcie_icc_opp_update(pcie); + qcom_pcie_common_icc_update(pcie->pci, pcie->icc_mem); return 0; }