From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bjorn Helgaas Subject: Re: [PATCH] PCI: Add MCFG quirks for Tegra194 host controllers Date: Fri, 3 Jan 2020 12:04:44 -0600 Message-ID: References: <20200103174935.5612-1-vidyas@nvidia.com> Reply-To: bjorn@helgaas.com Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Return-path: In-Reply-To: <20200103174935.5612-1-vidyas@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: Vidya Sagar Cc: Bjorn Helgaas , Lorenzo Pieralisi , "Rafael J. Wysocki" , Len Brown , Andrew Murray , treding@nvidia.com, jonathanh@nvidia.com, linux-tegra@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, LKML , kthota@nvidia.com, mmaddireddy@nvidia.com, sagar.tv@gmail.com List-Id: linux-tegra@vger.kernel.org On Fri, Jan 3, 2020 at 11:50 AM Vidya Sagar wrote: > > The PCIe controller in Tegra194 SoC is not completely ECAM-compliant. What is the plan for making these SoCs ECAM-compliant? When was Tegra194 designed? Is it shipping to end customers, i.e., would I be able to buy one? I do not want to add these quirks indefinitely, and the first quirks were added over three years ago. > With the current hardware design limitations in place, ECAM can be enabled > only for one controller (C5 controller to be precise) with bus numbers > starting from 160 instead of 0. A different approach is taken to avoid this > abnormal way of enabling ECAM for just one controller and to also enable > configuration space access for all the other controllers. In this approach, > MCFG quirks are added for each controller with a 30MB PCIe aperture > resource for each controller in the disguise of ECAM region. But, this > region actually contains DesignWare core's internal Address Translation > Unit (iATU) using which the ECAM ops access configuration space in the > otherwise standard way of programming iATU registers in DesignWare core > based IPs for a respective B:D:F. > > Signed-off-by: Vidya Sagar > --- > drivers/acpi/pci_mcfg.c | 13 +++ > drivers/pci/controller/dwc/pcie-tegra194.c | 95 ++++++++++++++++++++++ > include/linux/pci-ecam.h | 1 + > 3 files changed, 109 insertions(+) > > diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c > index 6b347d9920cc..a42918ecc19a 100644 > --- a/drivers/acpi/pci_mcfg.c > +++ b/drivers/acpi/pci_mcfg.c > @@ -116,6 +116,19 @@ static struct mcfg_fixup mcfg_quirks[] = { > THUNDER_ECAM_QUIRK(2, 12), > THUNDER_ECAM_QUIRK(2, 13), > > + { "NVIDIA", "TEGRA194", 1, 0, MCFG_BUS_ANY, &tegra194_pcie_ops, > + DEFINE_RES_MEM(0x38200000, (30 * SZ_1M))}, > + { "NVIDIA", "TEGRA194", 1, 1, MCFG_BUS_ANY, &tegra194_pcie_ops, > + DEFINE_RES_MEM(0x30200000, (30 * SZ_1M))}, > + { "NVIDIA", "TEGRA194", 1, 2, MCFG_BUS_ANY, &tegra194_pcie_ops, > + DEFINE_RES_MEM(0x32200000, (30 * SZ_1M))}, > + { "NVIDIA", "TEGRA194", 1, 3, MCFG_BUS_ANY, &tegra194_pcie_ops, > + DEFINE_RES_MEM(0x34200000, (30 * SZ_1M))}, > + { "NVIDIA", "TEGRA194", 1, 4, MCFG_BUS_ANY, &tegra194_pcie_ops, > + DEFINE_RES_MEM(0x36200000, (30 * SZ_1M))}, > + { "NVIDIA", "TEGRA194", 1, 5, MCFG_BUS_ANY, &tegra194_pcie_ops, > + DEFINE_RES_MEM(0x3a200000, (30 * SZ_1M))}, > + > #define XGENE_V1_ECAM_MCFG(rev, seg) \ > {"APM ", "XGENE ", rev, seg, MCFG_BUS_ANY, \ > &xgene_v1_pcie_ecam_ops } > diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c > index cbe95f0ea0ca..91496978deb7 100644 > --- a/drivers/pci/controller/dwc/pcie-tegra194.c > +++ b/drivers/pci/controller/dwc/pcie-tegra194.c > @@ -21,6 +21,8 @@ > #include > #include > #include > +#include > +#include > #include > #include > #include > @@ -895,6 +897,99 @@ static struct dw_pcie_host_ops tegra_pcie_dw_host_ops = { > .set_num_vectors = tegra_pcie_set_msi_vec_num, > }; > > +#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS) > +struct tegra194_pcie_acpi { > + void __iomem *dbi_base; > + void __iomem *iatu_base; > +}; > + > +static int tegra194_acpi_init(struct pci_config_window *cfg) > +{ > + struct device *dev = cfg->parent; > + struct tegra194_pcie_acpi *pcie; > + > + pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); > + if (!pcie) > + return -ENOMEM; > + > + pcie->dbi_base = cfg->win; > + pcie->iatu_base = cfg->win + SZ_256K; > + cfg->priv = pcie; > + > + return 0; > +} > + > +static inline void atu_reg_write(struct tegra194_pcie_acpi *pcie, int index, > + u32 val, u32 reg) > +{ > + u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index); > + > + writel(val, pcie->iatu_base + offset + reg); > +} > + > +static void program_outbound_atu(struct tegra194_pcie_acpi *pcie, int index, > + int type, u64 cpu_addr, u64 pci_addr, u64 size) > +{ > + atu_reg_write(pcie, index, lower_32_bits(cpu_addr), > + PCIE_ATU_LOWER_BASE); > + atu_reg_write(pcie, index, upper_32_bits(cpu_addr), > + PCIE_ATU_UPPER_BASE); > + atu_reg_write(pcie, index, lower_32_bits(pci_addr), > + PCIE_ATU_LOWER_TARGET); > + atu_reg_write(pcie, index, lower_32_bits(cpu_addr + size - 1), > + PCIE_ATU_LIMIT); > + atu_reg_write(pcie, index, upper_32_bits(pci_addr), > + PCIE_ATU_UPPER_TARGET); > + atu_reg_write(pcie, index, type, PCIE_ATU_CR1); > + atu_reg_write(pcie, index, PCIE_ATU_ENABLE, PCIE_ATU_CR2); > +} > + > +static void __iomem *tegra194_map_bus(struct pci_bus *bus, > + unsigned int devfn, int where) > +{ > + struct pci_config_window *cfg = bus->sysdata; > + struct tegra194_pcie_acpi *pcie = cfg->priv; > + u32 busdev; > + int type; > + > + if (bus->number < cfg->busr.start || bus->number > cfg->busr.end) > + return NULL; > + > + if (bus->number == cfg->busr.start) { > + if (PCI_SLOT(devfn) == 0) > + return pcie->dbi_base + where; > + else > + return NULL; > + } > + > + busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) | > + PCIE_ATU_FUNC(PCI_FUNC(devfn)); > + > + if (bus->parent->number == cfg->busr.start) { > + if (PCI_SLOT(devfn) == 0) > + type = PCIE_ATU_TYPE_CFG0; > + else > + return NULL; > + } else { > + type = PCIE_ATU_TYPE_CFG1; > + } > + > + program_outbound_atu(pcie, PCIE_ATU_REGION_INDEX0, type, > + cfg->res.start + SZ_128K, busdev, SZ_128K); > + return (void __iomem *)(pcie->dbi_base + SZ_128K + where); > +} > + > +struct pci_ecam_ops tegra194_pcie_ops = { > + .bus_shift = 20, > + .init = tegra194_acpi_init, > + .pci_ops = { > + .map_bus = tegra194_map_bus, > + .read = pci_generic_config_read, > + .write = pci_generic_config_write, > + } > +}; > +#endif /* defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS) */ > + > static void tegra_pcie_disable_phy(struct tegra_pcie_dw *pcie) > { > unsigned int phy_count = pcie->phy_count; > diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h > index a73164c85e78..6156140dcbb6 100644 > --- a/include/linux/pci-ecam.h > +++ b/include/linux/pci-ecam.h > @@ -57,6 +57,7 @@ extern struct pci_ecam_ops pci_thunder_ecam_ops; /* Cavium ThunderX 1.x */ > extern struct pci_ecam_ops xgene_v1_pcie_ecam_ops; /* APM X-Gene PCIe v1 */ > extern struct pci_ecam_ops xgene_v2_pcie_ecam_ops; /* APM X-Gene PCIe v2.x */ > extern struct pci_ecam_ops al_pcie_ops; /* Amazon Annapurna Labs PCIe */ > +extern struct pci_ecam_ops tegra194_pcie_ops; /* Tegra194 PCIe */ > #endif > > #ifdef CONFIG_PCI_HOST_COMMON > -- > 2.17.1 >