From patchwork Tue Sep 13 17:10:49 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kishon Vijay Abraham I X-Patchwork-Id: 76100 Delivered-To: patch@linaro.org Received: by 10.140.106.72 with SMTP id d66csp1465699qgf; Tue, 13 Sep 2016 10:14:21 -0700 (PDT) X-Received: by 10.98.27.11 with SMTP id b11mr3111676pfb.111.1473786861288; Tue, 13 Sep 2016 10:14:21 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id u9si11372989pax.163.2016.09.13.10.14.21; Tue, 13 Sep 2016 10:14:21 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760106AbcIMROH (ORCPT + 27 others); Tue, 13 Sep 2016 13:14:07 -0400 Received: from bear.ext.ti.com ([198.47.19.11]:60176 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759790AbcIMRM5 (ORCPT ); Tue, 13 Sep 2016 13:12:57 -0400 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id u8DHBeRk009502; Tue, 13 Sep 2016 12:11:40 -0500 Received: from DLEE71.ent.ti.com (dlee71.ent.ti.com [157.170.170.114]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id u8DHBeIg000450; Tue, 13 Sep 2016 12:11:40 -0500 Received: from dlep32.itg.ti.com (157.170.170.100) by DLEE71.ent.ti.com (157.170.170.114) with Microsoft SMTP Server id 14.3.294.0; Tue, 13 Sep 2016 12:11:39 -0500 Received: from a0393678ub.india.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep32.itg.ti.com (8.14.3/8.13.8) with ESMTP id u8DHAuWu013681; Tue, 13 Sep 2016 12:11:34 -0500 From: Kishon Vijay Abraham I To: Bjorn Helgaas , Arnd Bergmann , Jingoo Han , , , , , Pratyush Anand CC: , , , , , , Joao Pinto , Rob Herring , , Subject: [RFC PATCH] pci: controller: designware: Add EP mode support Date: Tue, 13 Sep 2016 22:40:49 +0530 Message-ID: <1473786653-12759-8-git-send-email-kishon@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1473786653-12759-1-git-send-email-kishon@ti.com> References: <1473786653-12759-1-git-send-email-kishon@ti.com> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add endpoint mode support to designware driver. This uses the EP Core layer introduced recently to add endpoint mode support. *Any* function driver can now use this designware device to achieve the EP functionality. Signed-off-by: Kishon Vijay Abraham I --- .../devicetree/bindings/pci/designware-pcie.txt | 26 ++- drivers/pci/controller/Kconfig | 5 + drivers/pci/controller/Makefile | 1 + drivers/pci/controller/pcie-designware-ep.c | 228 ++++++++++++++++++++ drivers/pci/controller/pcie-designware.c | 30 +++ drivers/pci/controller/pcie-designware.h | 45 ++++ 6 files changed, 324 insertions(+), 11 deletions(-) create mode 100644 drivers/pci/controller/pcie-designware-ep.c -- 1.7.9.5 diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt index 6c5322c..bb0b789 100644 --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt @@ -6,23 +6,27 @@ Required properties: - reg-names: Must be "config" for the PCIe configuration space. (The old way of getting the configuration address space from "ranges" is deprecated and should be avoided.) -- #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 -- #interrupt-cells: set to <1> -- interrupt-map-mask and interrupt-map: standard PCI properties - to define the mapping of the PCIe interface to interrupt +- #address-cells (only for host mode): set to <3> +- #size-cells (only for host mode): set to <2> +- device_type (only for host mode): set to "pci" +- ranges (only for host mode): ranges for the PCI memory and I/O regions +- num-ib-windows (only for EP mode): number of inbound address translation + windows +- num-ob-windows (only for EP mode): number of outbound address translation + windows +- #interrupt-cells (only for host mode): set to <1> +- interrupt-map-mask and interrupt-map (only for host mode): standard PCI + properties to define the mapping of the PCIe interface to interrupt numbers. - num-lanes: number of lanes to use Optional properties: - num-lanes: number of lanes to use (this property should be specified unless the link is brought already up in BIOS) -- reset-gpio: gpio pin number of power good signal -- bus-range: PCI bus numbers covered (it is recommended for new devicetrees to - specify this property, to keep backwards compatibility a range of 0x00-0xff - is assumed if not present) +- reset-gpio (only for host mode): gpio pin number of power good signal +- bus-range (only for host mode): PCI bus numbers covered (it is recommended + for new devicetrees to specify this property, to keep backwards compatibility + a range of 0x00-0xff is assumed if not present) - clocks: Must contain an entry for each entry in clock-names. See ../clocks/clock-bindings.txt for details. - clock-names: Must include the following entries: diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 249db74..8574828 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -78,6 +78,11 @@ config PCIE_DW_HOST depends on PCI select PCIE_DW +config PCIE_DW_EP + bool + depends on PCI_ENDPOINT + select PCIE_DW + config PCI_EXYNOS bool "Samsung Exynos PCIe controller" depends on SOC_EXYNOS5440 diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile index ee6bb85..11ef1e6 100644 --- a/drivers/pci/controller/Makefile +++ b/drivers/pci/controller/Makefile @@ -1,5 +1,6 @@ obj-$(CONFIG_PCIE_DW) += pcie-designware.o obj-$(CONFIG_PCIE_DW_HOST) += pcie-designware-host.o +obj-$(CONFIG_PCIE_DW_EP) += pcie-designware-ep.o obj-$(CONFIG_PCIE_DW_PLAT) += pcie-designware-plat.o obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o diff --git a/drivers/pci/controller/pcie-designware-ep.c b/drivers/pci/controller/pcie-designware-ep.c new file mode 100644 index 0000000..f683be9 --- /dev/null +++ b/drivers/pci/controller/pcie-designware-ep.c @@ -0,0 +1,228 @@ +/** + * pci-designware-ep.c - Synopsys Designware PCIe Endpoint controller driver + * + * Copyright (C) 2016 Texas Instruments + * Author: Kishon Vijay Abraham I + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include + +#include "pcie-designware.h" + +static void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar) +{ + u32 reg; + + reg = PCI_BASE_ADDRESS_0 + (4 * bar); + dw_pcie_write_dbi(pci, pci->dbi_base2, reg, 0x4, 0x0); + dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x4, 0x0); +} + +static int dw_pcie_ep_write_header(struct pci_epc *epc, + struct pci_epf_header *hdr) +{ + struct dw_pcie_ep *ep = epc_get_drvdata(epc); + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + void __iomem *base = pci->dbi_base; + + dw_pcie_write_dbi(pci, base, PCI_VENDOR_ID, 0x2, hdr->vendorid); + dw_pcie_write_dbi(pci, base, PCI_DEVICE_ID, 0x2, hdr->deviceid); + dw_pcie_write_dbi(pci, base, PCI_REVISION_ID, 0x1, hdr->revid); + dw_pcie_write_dbi(pci, base, PCI_CLASS_PROG, 0x1, hdr->progif_code); + dw_pcie_write_dbi(pci, base, PCI_CLASS_DEVICE, 0x2, + hdr->subclass_code | hdr->baseclass_code << 8); + dw_pcie_write_dbi(pci, base, PCI_CACHE_LINE_SIZE, 0x1, + hdr->cache_line_size); + dw_pcie_write_dbi(pci, base, PCI_SUBSYSTEM_VENDOR_ID, 0x2, + hdr->subsys_vendor_id); + dw_pcie_write_dbi(pci, base, PCI_SUBSYSTEM_ID, 0x2, hdr->subsys_id); + dw_pcie_write_dbi(pci, base, PCI_INTERRUPT_PIN, 0x1, + hdr->interrupt_pin); + + return 0; +} + +static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, enum pci_barno bar, + dma_addr_t cpu_addr, + enum dw_pcie_as_type as_type) +{ + int ret; + u32 free_win; + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + + free_win = find_first_zero_bit(&ep->ib_window_map, + sizeof(ep->ib_window_map)); + if (free_win >= ep->num_ib_windows) { + dev_err(pci->dev, "no free inbound window\n"); + return -EINVAL; + } + + ret = dw_pcie_prog_inbound_atu(pci, free_win, bar, cpu_addr, + as_type); + if (ret < 0) { + dev_err(pci->dev, "Failed to program IB window\n"); + return ret; + } + + ep->bar_to_atu[bar] = free_win; + set_bit(free_win, &ep->ib_window_map); + + return 0; +} + +static int dw_pcie_ep_set_bar(struct pci_epc *epc, enum pci_barno bar, + dma_addr_t bar_phys, size_t size, int flags) +{ + int ret; + struct dw_pcie_ep *ep = epc_get_drvdata(epc); + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + enum dw_pcie_as_type as_type; + u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar); + + if (!(flags & PCI_BASE_ADDRESS_SPACE)) + as_type = DW_PCIE_AS_MEM; + else + as_type = DW_PCIE_AS_IO; + + ret = dw_pcie_ep_inbound_atu(ep, bar, bar_phys, as_type); + if (ret) + return ret; + + dw_pcie_write_dbi(pci, pci->dbi_base2, reg, 0x4, size - 1); + dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x4, flags); + + return 0; +} + +static void dw_pcie_ep_clear_bar(struct pci_epc *epc, enum pci_barno bar) +{ + struct dw_pcie_ep *ep = epc_get_drvdata(epc); + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + void __iomem *base = pci->dbi_base; + + dw_pcie_ep_reset_bar(pci, bar); + + dw_pcie_write_dbi(pci, base, PCIE_ATU_VIEWPORT, 0x4, + PCIE_ATU_REGION_INBOUND | ep->bar_to_atu[bar]); + dw_pcie_write_dbi(pci, base, PCIE_ATU_CR2, 0x4, ~PCIE_ATU_ENABLE); +} + +static void *dw_pcie_ep_alloc_addr(struct pci_epc *epc, size_t size) +{ + /* TODO */ + return NULL; +} + +static void dw_pcie_ep_free_addr(struct pci_epc *epc) +{ + /* TODO */ +} + +static int dw_pcie_ep_raise_irq(struct pci_epc *epc, + enum pci_epc_irq_type type) +{ + struct dw_pcie_ep *ep = epc_get_drvdata(epc); + + if (!ep->ops->raise_irq) + return -EINVAL; + + return ep->ops->raise_irq(ep, type); +} + +static int dw_pcie_ep_start(struct pci_epc *epc) +{ + struct dw_pcie_ep *ep = epc_get_drvdata(epc); + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + + if (!pci->ops->start_link) + return -EINVAL; + + return pci->ops->start_link(pci); +} + +static void dw_pcie_ep_stop(struct pci_epc *epc) +{ + struct dw_pcie_ep *ep = epc_get_drvdata(epc); + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + + if (!pci->ops->stop_link) + return; + + pci->ops->stop_link(pci); +} + +void dw_pcie_ep_linkup(struct dw_pcie_ep *ep) +{ + struct pci_epc *epc = ep->epc; + struct pci_epf *epf = epc->epf; + + pci_epf_linkup(epf); +} + +const struct pci_epc_ops epc_ops = { + .write_header = dw_pcie_ep_write_header, + .set_bar = dw_pcie_ep_set_bar, + .clear_bar = dw_pcie_ep_clear_bar, + .alloc_addr_space = dw_pcie_ep_alloc_addr, + .free_addr_space = dw_pcie_ep_free_addr, + .raise_irq = dw_pcie_ep_raise_irq, + .start = dw_pcie_ep_start, + .stop = dw_pcie_ep_stop, +}; + +int dw_pcie_ep_init(struct dw_pcie_ep *ep) +{ + int ret; + enum pci_barno bar; + struct pci_epc *epc; + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + struct device *dev = pci->dev; + struct device_node *np = dev->of_node; + + ret = of_property_read_u32(np, "num-ib-windows", &ep->num_ib_windows); + if (ret < 0) { + dev_err(dev, "unable to read *num-ib-windows* property\n"); + return ret; + } + + ret = of_property_read_u32(np, "num-ob-windows", &ep->num_ob_windows); + if (ret < 0) { + dev_err(dev, "unable to read *num-ob-windows* property\n"); + return ret; + } + + for (bar = BAR_0; bar <= BAR_5; bar++) + dw_pcie_ep_reset_bar(pci, bar); + + if (ep->ops->ep_init) + ep->ops->ep_init(ep); + + epc = devm_pci_epc_create(dev, &epc_ops); + if (IS_ERR(epc)) { + dev_err(dev, "failed to create epc device\n"); + return PTR_ERR(epc); + } + + ep->epc = epc; + epc_set_drvdata(epc, ep); + dw_pcie_setup(pci); + + return 0; +} + +MODULE_DESCRIPTION("Designware PCIe endpoint controller driver"); +MODULE_AUTHOR("Kishon Vijay Abraham I "); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/pci/controller/pcie-designware.c b/drivers/pci/controller/pcie-designware.c index e52a020..4c091ff 100644 --- a/drivers/pci/controller/pcie-designware.c +++ b/drivers/pci/controller/pcie-designware.c @@ -115,6 +115,36 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, dw_pcie_read_dbi(pci, base, PCIE_ATU_CR2, 0x4, &val); } +int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar, + u64 cpu_addr, enum dw_pcie_as_type as_type) +{ + int type; + void __iomem *base = pci->dbi_base; + + dw_pcie_write_dbi(pci, base, PCIE_ATU_VIEWPORT, 0x4, + PCIE_ATU_REGION_INBOUND | index); + dw_pcie_write_dbi(pci, base, PCIE_ATU_LOWER_TARGET, 0x4, + lower_32_bits(cpu_addr)); + dw_pcie_write_dbi(pci, base, PCIE_ATU_UPPER_TARGET, 0x4, + upper_32_bits(cpu_addr)); + + switch (as_type) { + case DW_PCIE_AS_MEM: + type = PCIE_ATU_TYPE_MEM; + break; + case DW_PCIE_AS_IO: + type = PCIE_ATU_TYPE_IO; + break; + default: + return -EINVAL; + } + + dw_pcie_write_dbi(pci, base, PCIE_ATU_CR1, 0x4, type); + dw_pcie_write_dbi(pci, base, PCIE_ATU_CR2, 0x4, PCIE_ATU_ENABLE | + PCIE_ATU_BAR_MODE_ENABLE | (bar << 8)); + return 0; +} + int dw_pcie_wait_for_link(struct dw_pcie *pci) { int retries; diff --git a/drivers/pci/controller/pcie-designware.h b/drivers/pci/controller/pcie-designware.h index 53eaa50..773bd35 100644 --- a/drivers/pci/controller/pcie-designware.h +++ b/drivers/pci/controller/pcie-designware.h @@ -18,6 +18,9 @@ #include #include +#include +#include + /* Synopsis specific PCIE configuration registers */ #define PCIE_PORT_LINK_CONTROL 0x710 #define PORT_LINK_MODE_MASK (0x3f << 16) @@ -82,6 +85,7 @@ struct dw_pcie; struct pcie_port; +struct dw_pcie_ep; enum dw_pcie_device_mode { DW_PCIE_UNKNOWN_TYPE, @@ -132,6 +136,27 @@ struct pcie_port { DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS); }; +enum dw_pcie_as_type { + DW_PCIE_AS_UNKNOWN, + DW_PCIE_AS_MEM, + DW_PCIE_AS_IO, +}; + +struct dw_pcie_ep_ops { + void (*ep_init)(struct dw_pcie_ep *ep); + int (*raise_irq)(struct dw_pcie_ep *ep, enum pci_epc_irq_type type); +}; + +struct dw_pcie_ep { + struct pci_epc *epc; + struct dw_pcie_ep_ops *ops; + u8 bar_to_atu[6]; + unsigned long ib_window_map; + unsigned long ob_window_map; + u32 num_ib_windows; + u32 num_ob_windows; +}; + struct dw_pcie_ops { void (*read_dbi)(struct dw_pcie *pcie, void __iomem *base, int size, u32 *val); @@ -149,15 +174,21 @@ struct dw_pcie { u32 lanes; const struct dw_pcie_ops *ops; struct pcie_port pp; + struct dw_pcie_ep ep; }; #define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp) +#define to_dw_pcie_from_ep(endpoint) \ + container_of((endpoint), struct dw_pcie, ep) + int dw_pcie_wait_for_link(struct dw_pcie *pci); int dw_pcie_link_up(struct dw_pcie *pci); void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type, u64 cpu_addr, u64 pci_addr, u32 size); +int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar, + u64 cpu_addr, enum dw_pcie_as_type as_type); int dw_pcie_read(void __iomem *addr, int size, u32 *val); int dw_pcie_write(void __iomem *addr, int size, u32 val); void dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, @@ -166,6 +197,20 @@ void dw_pcie_write_dbi(struct dw_pcie *pci, void *base, u32 reg, int size, u32 val); void dw_pcie_setup(struct dw_pcie *pci); +#ifdef CONFIG_PCIE_DW_EP +void dw_pcie_ep_linkup(struct dw_pcie_ep *ep); +int dw_pcie_ep_init(struct dw_pcie_ep *ep); +#else +static inline void dw_pcie_ep_linkup(struct dw_pcie_ep *ep) +{ +} + +static inline int dw_pcie_ep_init(struct dw_pcie_ep *ep) +{ + return 0; +} +#endif + #ifdef CONFIG_PCIE_DW_HOST irqreturn_t dw_handle_msi_irq(struct pcie_port *pp); void dw_pcie_msi_init(struct pcie_port *pp);