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Thu, 1 Feb 2024 16:14:06 +0000 From: Frank Li Date: Thu, 01 Feb 2024 11:13:30 -0500 Subject: [PATCH v2 6/6] PCI: dwc: Add common send PME_Turn_Off message method Message-Id: <20240201-pme_msg-v2-6-6767052fe6a4@nxp.com> References: <20240201-pme_msg-v2-0-6767052fe6a4@nxp.com> In-Reply-To: <20240201-pme_msg-v2-0-6767052fe6a4@nxp.com> To: Bjorn Helgaas , Jingoo Han , Gustavo Pimentel , Manivannan Sadhasivam , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley , imx@lists.linux.dev Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Frank Li X-Mailer: b4 0.13-dev-c87ef X-Developer-Signature: v=1; a=ed25519-sha256; t=1706804020; l=4224; i=Frank.Li@nxp.com; s=20240130; h=from:subject:message-id; bh=T8i2d5YcwxgVg17BF/Je9te+972ffy5ilUf3q6l9KnY=; b=2ogMPxh4HPH8Hgdna2hIpwSM0R5Jt13ZQe3qobHiYtMb81KYKNaL2HzSYVn6QfJtjOcyo8DR5 4jJCrQgP5yPCu84EhumQVgRatgSAq4QHljbyI09wOZUPdnaTF/v8ElM X-Developer-Key: i=Frank.Li@nxp.com; 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So one MMIO write can trigger a PCI message, such as PME_Turn_Off. Add common dw_pcie_send_pme_turn_off_by_atu() function. Call dw_pcie_send_pme_turn_off_by_atu() to send out PME_Turn_Off message in general dw_pcie_suspend_noirq() if there are not platform callback pme_turn_off() exist. Signed-off-by: Frank Li --- drivers/pci/controller/dwc/pcie-designware-host.c | 51 +++++++++++++++++++++-- drivers/pci/controller/dwc/pcie-designware.c | 8 ++++ drivers/pci/controller/dwc/pcie-designware.h | 3 ++ 3 files changed, 58 insertions(+), 4 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 267687ab33cbc..2a281060f3aad 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -728,6 +728,8 @@ static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp) dev_warn(pci->dev, "Ranges exceed outbound iATU size (%d)\n", pci->num_ob_windows); + pci->msg_atu_index = i; + i = 0; resource_list_for_each_entry(entry, &pp->bridge->dma_ranges) { if (resource_type(entry->res) != IORESOURCE_MEM) @@ -833,11 +835,49 @@ int dw_pcie_setup_rc(struct dw_pcie_rp *pp) } EXPORT_SYMBOL_GPL(dw_pcie_setup_rc); +static int dw_pcie_send_pme_turn_off_by_atu(struct dw_pcie *pci) +{ + struct dw_pcie_ob_atu_cfg atu = { 0 }; + void __iomem *m; + int ret = 0; + + if (pci->num_ob_windows <= pci->msg_atu_index) + return -EINVAL; + + atu.code = PCI_MSG_CODE_PME_TURN_OFF; + atu.routing = PCI_MSG_TYPE_R_BC; + atu.type = PCIE_ATU_TYPE_MSG; + atu.size = pci->msg_io_size; + + if (!atu.size) { + dev_dbg(pci->dev, + "atu memory map windows is zero, please check 'msg' reg in dts\n"); + return -ENOMEM; + } + + atu.cpu_addr = pci->msg_io_base; + + ret = dw_pcie_prog_outbound_atu(pci, &atu); + if (ret) + return ret; + + m = ioremap(atu.cpu_addr, PAGE_SIZE); + if (!m) + return -ENOMEM; + + /* A dummy write is converted to a Msg TLP */ + writel(0, m); + + iounmap(m); + + return ret; +} + int dw_pcie_suspend_noirq(struct dw_pcie *pci) { u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); u32 val; - int ret; + int ret = 0; /* * If L1SS is supported, then do not put the link into L2 as some @@ -849,10 +889,13 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci) if (dw_pcie_get_ltssm(pci) <= DW_PCIE_LTSSM_DETECT_ACT) return 0; - if (!pci->pp.ops->pme_turn_off) - return 0; + if (pci->pp.ops->pme_turn_off) + pci->pp.ops->pme_turn_off(&pci->pp); + else + ret = dw_pcie_send_pme_turn_off_by_atu(pci); - pci->pp.ops->pme_turn_off(&pci->pp); + if (ret) + return ret; ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE, PCIE_PME_TO_L2_TIMEOUT_US/10, diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index ba909fade9db1..eb24362009bb6 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -155,6 +155,14 @@ int dw_pcie_get_resources(struct dw_pcie *pci) } } + if (!pci->msg_io_base) { + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "msg"); + if (res) { + pci->msg_io_base = res->start; + pci->msg_io_size = res->end - res->start + 1; + } + } + /* LLDD is supposed to manually switch the clocks and resets state */ if (dw_pcie_cap_is(pci, REQ_RES)) { ret = dw_pcie_get_clocks(pci); diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 703b50bc5e0f1..866ab44df9fd1 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -424,6 +424,9 @@ struct dw_pcie { struct reset_control_bulk_data core_rsts[DW_PCIE_NUM_CORE_RSTS]; struct gpio_desc *pe_rst; bool suspended; + int msg_atu_index; + phys_addr_t msg_io_base; + size_t msg_io_size; }; #define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)