Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751615AbbLUPoh (ORCPT ); Mon, 21 Dec 2015 10:44:37 -0500 Received: from smtprelay.synopsys.com ([198.182.60.111]:34357 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751412AbbLUPod (ORCPT ); Mon, 21 Dec 2015 10:44:33 -0500 From: Joao Pinto To: Vineet.Gupta1@synopsys.com, helgaas@kernel.org Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, CARLOS.PALMINHA@synopsys.com, Alexey.Brodkin@synopsys.com, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, Joao Pinto Subject: [PATCH v3 2/2] add new platform driver for PCI RC Date: Mon, 21 Dec 2015 15:44:16 +0000 Message-Id: <5d0ef02da7c69534420aac36a8a0a375873bae99.1450694884.git.jpinto@synopsys.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 13658 Lines: 460 This patch adds a new driver that will be the reference platform driver for all PCI RC IP Protoyping Kits based on ARC SDP. This patch is composed by: -Changes to pcie-designware driver add a function that enables the feature of starting the LTSSM (Link Train Status State) used by the new driver -MAINTAINERS file was updated to include the new driver -Documentation/devicetree/bindings/pci was updated to include the new driver documentation -New driver called pcie-snpsdev Signed-off-by: Joao Pinto --- Changes v2 -> v3: - link init stuff was moved to a snpsdev_pcie_establish_link() function in pcie-snpsdev (Bjorn Helgaas) - pcie-snpsdev driver declaration was changed to be more standard (Bjorn Helgaas) - pcie-designware' dw_pcie_link_retrain() now use standard registers from pci-regs.h (Bjorn Helgaas) - pcie-snpsdev.txt was complemented with more info (Mark Rutland) Changes v1 -> v2 (Bjorn Helgaas): - Fixups snpsdev_pcie_fixup_bridge() and snpsdev_pcie_fixup_res() were removed from the driver (these functions were for specific tests only and not usefull in mainline) - Driver' comments were reviewed (fix Typos and excessive comments removal) - Removed unnecessary definitions in the driver source (PCIE_PHY_CTRL and PCIE_PHY_STAT) .../devicetree/bindings/pci/pcie-snpsdev.txt | 33 +++ MAINTAINERS | 7 + drivers/pci/host/Kconfig | 5 + drivers/pci/host/Makefile | 1 + drivers/pci/host/pcie-designware.c | 11 + drivers/pci/host/pcie-designware.h | 1 + drivers/pci/host/pcie-snpsdev.c | 286 +++++++++++++++++++++ 7 files changed, 344 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/pcie-snpsdev.txt create mode 100644 drivers/pci/host/pcie-snpsdev.c diff --git a/Documentation/devicetree/bindings/pci/pcie-snpsdev.txt b/Documentation/devicetree/bindings/pci/pcie-snpsdev.txt new file mode 100644 index 0000000..cae548b --- /dev/null +++ b/Documentation/devicetree/bindings/pci/pcie-snpsdev.txt @@ -0,0 +1,33 @@ +Synopsys PCI RC IP Prototyping Kit +---------------------------------- + +This is the reference platform driver to be used in the Synopsys PCI Root +Complex IP Prototyping Kit. + +Required properties: +- compatible: set to "snps,pcie-snpsdev"; +- reg: base address and length of the pcie controller registers. +- #address-cells: set to <3> +- #size-cells: set to <2> +- device_type: set to "pci" +- ranges: ranges for the PCI memory and I/O regions. +- interrupts: one interrupt source for MSI interrupts, followed by interrupt + source for hardware related interrupts. +- #interrupt-cells: set to <1> +- num-lanes: set to <1>; + +Example configuration: + + pcie: pcie@0xdffff000 { + compatible = "snps,pcie-snpsdev"; + reg = <0xdffff000 0x1000>; + #address-cells = <3>; + #size-cells = <2>; + device_type = "pci"; + ranges = <0x00000800 0 0xd0000000 0xd0000000 0 0x00002000>, + <0x81000000 0 0x00000000 0xde000000 0 0x00010000>, + <0x82000000 0 0xd0400000 0xd0400000 0 0x0d000000>; + interrupts = <25>, <24>; + #interrupt-cells = <1>; + num-lanes = <1>; + }; diff --git a/MAINTAINERS b/MAINTAINERS index e9caa4b..d2e4506 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8230,6 +8230,13 @@ S: Maintained F: Documentation/devicetree/bindings/pci/hisilicon-pcie.txt F: drivers/pci/host/pcie-hisi.c +PCI DRIVER FOR SYNOPSYS PROTOTYPING DEVICE +M: Joao Pinto +L: linux-pci@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/pci/pcie-snpsdev.txt +F: drivers/pci/host/pcie-snpsdev.c + PCMCIA SUBSYSTEM P: Linux PCMCIA Team L: linux-pcmcia@lists.infradead.org diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index f131ba9..a874b1e 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -172,4 +172,9 @@ config PCI_HISI help Say Y here if you want PCIe controller support on HiSilicon HIP05 SoC +config PCIE_SNPSDEV + bool "Platform Driver for Synopsys Device" + select PCIEPORTBUS + select PCIE_DW + endmenu diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile index 9d4d3c6..e422f65 100644 --- a/drivers/pci/host/Makefile +++ b/drivers/pci/host/Makefile @@ -20,3 +20,4 @@ obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o obj-$(CONFIG_PCIE_ALTERA) += pcie-altera.o obj-$(CONFIG_PCIE_ALTERA_MSI) += pcie-altera-msi.o obj-$(CONFIG_PCI_HISI) += pcie-hisi.o +obj-$(CONFIG_PCIE_SNPSDEV) += pcie-snpsdev.o diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index 540f077..99fad62 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -22,6 +22,8 @@ #include #include #include +#include +#include #include "pcie-designware.h" @@ -706,6 +708,15 @@ static struct pci_ops dw_pcie_ops = { .write = dw_pcie_wr_conf, }; +void dw_pcie_link_retrain(struct pcie_port *pp) +{ + u32 val = 0; + + dw_pcie_readl_rc(pp, PCI_EXP_LNKCTL+0x70, &val); + val = val | PCI_EXP_LNKCTL_RL; + dw_pcie_writel_rc(pp, val, PCI_EXP_LNKCTL+0x70); +} + void dw_pcie_setup_rc(struct pcie_port *pp) { u32 val; diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h index 2356d29..249b631 100644 --- a/drivers/pci/host/pcie-designware.h +++ b/drivers/pci/host/pcie-designware.h @@ -79,5 +79,6 @@ void dw_pcie_msi_init(struct pcie_port *pp); int dw_pcie_link_up(struct pcie_port *pp); void dw_pcie_setup_rc(struct pcie_port *pp); int dw_pcie_host_init(struct pcie_port *pp); +void dw_pcie_link_retrain(struct pcie_port *pp); #endif /* _PCIE_DESIGNWARE_H */ diff --git a/drivers/pci/host/pcie-snpsdev.c b/drivers/pci/host/pcie-snpsdev.c new file mode 100644 index 0000000..4ca7ec5 --- /dev/null +++ b/drivers/pci/host/pcie-snpsdev.c @@ -0,0 +1,286 @@ +/* + * PCIe RC driver for Synopsys Designware Core + * + * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com) + * + * Authors: Manjunath Bettegowda , + * Jie Deng + * Joao Pinto + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "pcie-designware.h" + +#define to_snpsdev_pcie(x) container_of(x, struct snpsdev_pcie, pp) + +struct snpsdev_pcie { + void __iomem *mem_base; /* Memory Base to access Core's [RC] + * Config Space Layout + */ + struct pcie_port pp; /* RC Root Port specific structure - + * DWC_PCIE_RC stuff + */ +}; + +#define PCI_EQUAL_CONTROL_PHY 0x00000707 + +/* PCIe Port Logic registers (memory-mapped) */ +#define PLR_OFFSET 0x700 +#define PCIE_PHY_DEBUG_R0 (PLR_OFFSET + 0x28) /* 0x728 */ +#define PCIE_PHY_DEBUG_R1 (PLR_OFFSET + 0x2c) /* 0x72c */ + +/* This handler was created for future work */ +static irqreturn_t snpsdev_pcie_irq_handler(int irq, void *arg) +{ + return IRQ_NONE; +} + +static irqreturn_t snpsdev_pcie_msi_irq_handler(int irq, void *arg) +{ + struct pcie_port *pp = arg; + + dw_handle_msi_irq(pp); + + return IRQ_HANDLED; +} + +static void snpsdev_pcie_init_phy(struct pcie_port *pp) +{ + /* write Lane 0 Equalization Control fields register */ + writel(PCI_EQUAL_CONTROL_PHY, pp->dbi_base + 0x154); +} + +static int snpsdev_pcie_deassert_core_reset(struct pcie_port *pp) +{ + return 0; +} + +static void snpsdev_pcie_establish_link(struct pcie_port *pp) +{ + int count = 0; + + /* Initialize Phy (Reset/poweron/control-inputs ) */ + snpsdev_pcie_init_phy(pp); + + /* de-assert core reset */ + snpsdev_pcie_deassert_core_reset(pp); + + /* We expect the PCIe Link to be up by this time */ + dw_pcie_setup_rc(pp); + + /* Start LTSSM here */ + dw_pcie_link_retrain(pp); + + while (!dw_pcie_link_up(pp)) { + usleep_range(1000, 1100); + count++; + if (count == 20) { + dev_err(pp->dev, "phy link never came up\n"); + dev_dbg(pp->dev, + "PL_DEBUG0: 0x%08x, DEBUG_R1: 0x%08x\n", + readl(pp->dbi_base + PCIE_PHY_DEBUG_R0), + readl(pp->dbi_base + PCIE_PHY_DEBUG_R1)); + break; + } + } +} + +/* + * snpsdev_pcie_host_init() + * Platform specific host/RC initialization + * a. Assert the core reset + * b. Assert and deassert phy reset and initialize the phy + * c. De-Assert the core reset + * d. Initializet the Root Port (BARs/Memory Or IO/ Interrupt/ Commnad Reg) + * e. Initiate Link startup procedure + * + */ +static void snpsdev_pcie_host_init(struct pcie_port *pp) +{ + /* Establish link */ + snpsdev_pcie_establish_link(pp); + + if (IS_ENABLED(CONFIG_PCI_MSI)) + dw_pcie_msi_init(pp); +} + +static int snpsdev_pcie_link_up(struct pcie_port *pp) +{ + u32 status; + + /* Bit number 36: reports LTSSM PHY Link UP; Available in bit 3 of + * PCIE_PHY_DEBUG_R1 + */ + status = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1) & (0x1 << 4); + if (status != 0) + return 1; + + /* TODO:Now Link is in L0;Initiate GEN2/GEN3 migration if RC Supports*/ + return 0; +} + +/** + * This is RC operation structure + * snpsdev_pcie_link_up: the function which initiates the phy link up procedure + * snpsdev_pcie_host_init: the function which does the host/RC Root port + * initialization. + */ +static struct pcie_host_ops snpsdev_pcie_host_ops = { + .link_up = snpsdev_pcie_link_up, + .host_init = snpsdev_pcie_host_init, +}; + +/** + * snpsdev_add_pcie_port + * This function + * a. installs the interrupt handler + * b. registers host operations in the pcie_port structure + */ +static int snpsdev_add_pcie_port(struct pcie_port *pp, + struct platform_device *pdev) +{ + int ret; + + pp->irq = platform_get_irq(pdev, 1); + + if (pp->irq < 0) { + if (pp->irq != -EPROBE_DEFER) + dev_err(&pdev->dev, "cannot get irq\n"); + return pp->irq; + } + + ret = devm_request_irq(&pdev->dev, pp->irq, snpsdev_pcie_irq_handler, + IRQF_SHARED, "snpsdev-pcie", pp); + + if (ret) { + dev_err(&pdev->dev, "failed to request irq\n"); + return ret; + } + + if (IS_ENABLED(CONFIG_PCI_MSI)) { + pp->msi_irq = platform_get_irq(pdev, 0); + + if (pp->msi_irq < 0) { + if (pp->msi_irq != -EPROBE_DEFER) + dev_err(&pdev->dev, "cannot get msi irq\n"); + return pp->msi_irq; + } + + ret = devm_request_irq(&pdev->dev, pp->msi_irq, + snpsdev_pcie_msi_irq_handler, + IRQF_SHARED, "snpsdev-pcie-msi", pp); + if (ret) { + dev_err(&pdev->dev, "failed to request msi irq\n"); + return ret; + } + } + + pp->root_bus_nr = -1; + pp->ops = &snpsdev_pcie_host_ops; + + /* Below function: + * Checks for range property from DT + * Gets the IO and MEMORY and CONFIG-Space ranges from DT + * Does IOREMAPS on the physical addresses + * Gets the num-lanes from DT + * Gets MSI capability from DT + * Calls the platform specific host initialization + * Program the correct class, BAR0, Link width, in Config space + * Then it calls pci common init routine + * Then it calls function to assign "unassigned resources" + */ + ret = dw_pcie_host_init(pp); + if (ret) { + dev_err(&pdev->dev, "failed to initialize host\n"); + return ret; + } + + return 0; +} + +/** + * snpsdev_pcie_rc_probe() + * This function gets called as part of pcie registration. if the id matches + * the platform driver framework will call this function. + * + * @pdev: Pointer to the platform_device structure + * + * Returns zero on success; Negative errorno on failure + */ +static int snpsdev_pcie_rc_probe(struct platform_device *pdev) +{ + struct snpsdev_pcie *snpsdev_pcie; + struct pcie_port *pp; + struct resource *dwc_pcie_rc_res; /* Resource from DT */ + int ret; + + snpsdev_pcie = devm_kzalloc(&pdev->dev, sizeof(*snpsdev_pcie), + GFP_KERNEL); + if (!snpsdev_pcie) + return -ENOMEM; + + pp = &snpsdev_pcie->pp; + pp->dev = &pdev->dev; + + dwc_pcie_rc_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + if (!dwc_pcie_rc_res) + return -ENODEV; + + snpsdev_pcie->mem_base = devm_ioremap_resource(&pdev->dev, + dwc_pcie_rc_res); + if (IS_ERR(snpsdev_pcie->mem_base)) { + ret = PTR_ERR(snpsdev_pcie->mem_base); + return ret; + } + pp->dbi_base = snpsdev_pcie->mem_base; + + ret = snpsdev_add_pcie_port(pp, pdev); + if (ret < 0) + return ret; + + platform_set_drvdata(pdev, snpsdev_pcie); + + return 0; +} + +static int snpsdev_pcie_rc_remove(struct platform_device *pdev) +{ + return 0; +} + +static const struct of_device_id snpsdev_pcie_rc_of_match[] = { + { .compatible = "snps,pcie-snpsdev", }, + {}, +}; +MODULE_DEVICE_TABLE(of, snpsdev_pcie_rc_of_match); + +static struct platform_driver snpsdev_pcie_rc_driver = { + .driver = { + .name = "pcie-snpsdev", + .of_match_table = snpsdev_pcie_rc_of_match, + }, + .probe = snpsdev_pcie_rc_probe, +}; + +module_platform_driver(snpsdev_pcie_rc_driver); + +MODULE_AUTHOR("Manjunath Bettegowda "); +MODULE_DESCRIPTION("Platform Driver for Synopsys Device"); +MODULE_LICENSE("GPL v2"); -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/