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Mon, 17 Apr 2023 05:33:21 -0500 From: Thippeswamy Havalige To: , , , CC: , , , , , , Thippeswamy Havalige Subject: [PATCH 2/2] PCI: xilinx-xdma: Add Xilinx XDMA Root Port driver Date: Mon, 17 Apr 2023 16:02:26 +0530 Message-ID: <20230417103226.334588-3-thippeswamy.havalige@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230417103226.334588-1-thippeswamy.havalige@amd.com> References: <20230417103226.334588-1-thippeswamy.havalige@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF00010209:EE_|SJ2PR12MB8158:EE_ X-MS-Office365-Filtering-Correlation-Id: c9e3aa8b-e76c-46ec-dfde-08db3f2f2ce0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230028)(4636009)(136003)(376002)(346002)(39860400002)(396003)(451199021)(40470700004)(46966006)(36840700001)(70206006)(70586007)(30864003)(2906002)(1076003)(44832011)(336012)(82310400005)(426003)(478600001)(5660300002)(8676002)(40480700001)(4326008)(41300700001)(36756003)(40460700003)(110136005)(8936002)(54906003)(316002)(82740400003)(81166007)(47076005)(36860700001)(86362001)(26005)(83380400001)(2616005)(356005)(186003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Apr 2023 10:33:25.1536 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c9e3aa8b-e76c-46ec-dfde-08db3f2f2ce0 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF00010209.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8158 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,SPF_HELO_PASS, SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add support for Xilinx XDMA Soft IP core as Root Port. The Zynq UltraScale+ MPSoCs devices support XDMA soft IP module in programmable logic. The integrated XDMA soft IP block has integrated bridge function that can act as PCIe Root Port. Signed-off-by: Thippeswamy Havalige Signed-off-by: Bharat Kumar Gogada --- drivers/pci/controller/Kconfig | 10 + drivers/pci/controller/Makefile | 1 + drivers/pci/controller/pcie-xdma-pl.c | 877 ++++++++++++++++++++++++++ 3 files changed, 888 insertions(+) create mode 100644 drivers/pci/controller/pcie-xdma-pl.c diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 42654035654a..edc7812673ff 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -113,6 +113,16 @@ config PCIE_XILINX_CPM Say 'Y' here if you want kernel support for the Xilinx Versal CPM host bridge. +config PCIE_XILINX_DMA + bool "Xilinx DMA PL PCIe host bridge support" + depends on ARCH_ZYNQMP || COMPILE_TEST + depends on PCI_MSI + select PCI_HOST_COMMON + help + Say 'Y' here if you want kernel to enable support for the + XILINX PL PCIe host bridge support, this PCIe controller + includes DMA PL component. + config PCI_XGENE bool "X-Gene PCIe controller" depends on ARM64 || COMPILE_TEST diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile index 37c8663de7fe..567890c7952e 100644 --- a/drivers/pci/controller/Makefile +++ b/drivers/pci/controller/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_PCIE_RCAR_HOST) += pcie-rcar.o pcie-rcar-host.o obj-$(CONFIG_PCIE_RCAR_EP) += pcie-rcar.o pcie-rcar-ep.o obj-$(CONFIG_PCI_HOST_COMMON) += pci-host-common.o obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o +obj-$(CONFIG_PCIE_XILINX_DMA) += pcie-xdma-pl.o obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o diff --git a/drivers/pci/controller/pcie-xdma-pl.c b/drivers/pci/controller/pcie-xdma-pl.c new file mode 100644 index 000000000000..487d2be3bf45 --- /dev/null +++ b/drivers/pci/controller/pcie-xdma-pl.c @@ -0,0 +1,877 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PCIe host controller driver for Xilinx XDMA PCIe Bridge + * + * Copyright (C) 2017 Xilinx, Inc. All rights reserved. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../pci.h" + +/* Register definitions */ +#define XILINX_PCIE_DMA_REG_IDR 0x00000138 +#define XILINX_PCIE_DMA_REG_IMR 0x0000013c +#define XILINX_PCIE_DMA_REG_PSCR 0x00000144 +#define XILINX_PCIE_DMA_REG_RPSC 0x00000148 +#define XILINX_PCIE_DMA_REG_MSIBASE1 0x0000014c +#define XILINX_PCIE_DMA_REG_MSIBASE2 0x00000150 +#define XILINX_PCIE_DMA_REG_RPEFR 0x00000154 +#define XILINX_PCIE_DMA_REG_IDRN 0x00000160 +#define XILINX_PCIE_DMA_REG_IDRN_MASK 0x00000164 +#define XILINX_PCIE_DMA_REG_MSI_LOW 0x00000170 +#define XILINX_PCIE_DMA_REG_MSI_HI 0x00000174 +#define XILINX_PCIE_DMA_REG_MSI_LOW_MASK 0x00000178 +#define XILINX_PCIE_DMA_REG_MSI_HI_MASK 0x0000017c + +/* Interrupt registers definitions */ +#define XILINX_PCIE_DMA_INTR_LINK_DOWN 0 +#define XILINX_PCIE_DMA_INTR_HOT_RESET 3 +#define XILINX_PCIE_DMA_INTR_CFG_TIMEOUT 8 +#define XILINX_PCIE_DMA_INTR_CORRECTABLE 9 +#define XILINX_PCIE_DMA_INTR_NONFATAL 10 +#define XILINX_PCIE_DMA_INTR_FATAL 11 +#define XILINX_PCIE_DMA_INTR_INTX 16 +#define XILINX_PCIE_DMA_INTR_MSI 17 +#define XILINX_PCIE_DMA_INTR_SLV_UNSUPP 20 +#define XILINX_PCIE_DMA_INTR_SLV_UNEXP 21 +#define XILINX_PCIE_DMA_INTR_SLV_COMPL 22 +#define XILINX_PCIE_DMA_INTR_SLV_ERRP 23 +#define XILINX_PCIE_DMA_INTR_SLV_CMPABT 24 +#define XILINX_PCIE_DMA_INTR_SLV_ILLBUR 25 +#define XILINX_PCIE_DMA_INTR_MST_DECERR 26 +#define XILINX_PCIE_DMA_INTR_MST_SLVERR 27 + +#define IMR(x) BIT(XILINX_PCIE_DMA_INTR_ ##x) + +#define XILINX_PCIE_DMA_INTR_IMR_ALL_MASK \ + ( \ + IMR(LINK_DOWN) | \ + IMR(HOT_RESET) | \ + IMR(CFG_TIMEOUT) | \ + IMR(CORRECTABLE) | \ + IMR(NONFATAL) | \ + IMR(FATAL) | \ + IMR(INTX) | \ + IMR(MSI) | \ + IMR(SLV_UNSUPP) | \ + IMR(SLV_UNEXP) | \ + IMR(SLV_COMPL) | \ + IMR(SLV_ERRP) | \ + IMR(SLV_CMPABT) | \ + IMR(SLV_ILLBUR) | \ + IMR(MST_DECERR) | \ + IMR(MST_SLVERR) | \ + ) + +#define XILINX_PCIE_DMA_IMR_ALL_MASK 0x0FF30FE9 +#define XILINX_PCIE_DMA_IDR_ALL_MASK 0xFFFFFFFF +#define XILINX_PCIE_DMA_IDRN_MASK GENMASK(19, 16) + +/* Root Port Error Register definitions */ +#define XILINX_PCIE_DMA_RPEFR_ERR_VALID BIT(18) +#define XILINX_PCIE_DMA_RPEFR_REQ_ID GENMASK(15, 0) +#define XILINX_PCIE_DMA_RPEFR_ALL_MASK 0xFFFFFFFF + +/* Root Port Interrupt Register definitions */ +#define XILINX_PCIE_DMA_IDRN_SHIFT 16 + +/* Root Port Status/control Register definitions */ +#define XILINX_PCIE_DMA_REG_RPSC_BEN BIT(0) + +/* Phy Status/Control Register definitions */ +#define XILINX_PCIE_DMA_REG_PSCR_LNKUP BIT(11) + +/* Number of MSI IRQs */ +#define XILINX_NUM_MSI_IRQS 64 + +struct xilinx_msi { + struct irq_domain *msi_domain; + unsigned long *bitmap; + struct irq_domain *dev_domain; + struct mutex lock; /* protect bitmap variable */ + int irq_msi0; + int irq_msi1; +}; + +/** + * struct xilinx_pcie_dma - PCIe port information + * @reg_base: IO Mapped Register Base + * @irq: Interrupt number + * @cfg: Holds mappings of config space window + * @root_busno: Root Bus number + * @dev: Device pointer + * @phys_reg_base: Physical address of reg base + * @leg_domain: Legacy IRQ domain pointer + * @pldma_domain: PL DMA IRQ domain pointer + * @resources: Bus Resources + * @msi: MSI information + * @irq_misc: Legacy and error interrupt number + * @intx_irq: legacy interrupt number + * @lock: lock protecting shared register access + */ +struct xilinx_pcie_dma { + void __iomem *reg_base; + u32 irq; + struct pci_config_window *cfg; + u8 root_busno; + struct device *dev; + phys_addr_t phys_reg_base; + struct irq_domain *leg_domain; + struct irq_domain *pldma_domain; + struct list_head resources; + struct xilinx_msi msi; + int irq_misc; + int intx_irq; + raw_spinlock_t lock; +}; + +static inline u32 pcie_read(struct xilinx_pcie_dma *port, u32 reg) +{ + return readl(port->reg_base + reg); +} + +static inline void pcie_write(struct xilinx_pcie_dma *port, u32 val, u32 reg) +{ + writel(val, port->reg_base + reg); +} + +static inline bool xilinx_pcie_dma_linkup(struct xilinx_pcie_dma *port) +{ + return (pcie_read(port, XILINX_PCIE_DMA_REG_PSCR) & + XILINX_PCIE_DMA_REG_PSCR_LNKUP) ? 1 : 0; +} + +/** + * xilinx_pcie_dma_clear_err_interrupts - Clear Error Interrupts + * @port: PCIe port information + */ +static void xilinx_pcie_dma_clear_err_interrupts(struct xilinx_pcie_dma *port) +{ + unsigned long val = pcie_read(port, XILINX_PCIE_DMA_REG_RPEFR); + + if (val & XILINX_PCIE_DMA_RPEFR_ERR_VALID) { + dev_dbg(port->dev, "Requester ID %lu\n", + val & XILINX_PCIE_DMA_RPEFR_REQ_ID); + pcie_write(port, XILINX_PCIE_DMA_RPEFR_ALL_MASK, + XILINX_PCIE_DMA_REG_RPEFR); + } +} + +/** + * xilinx_pcie_dma_valid_device - Check if a valid device is present on bus + * @bus: PCI Bus structure + * @devfn: device/function + * + * Return: 'true' on success and 'false' if invalid device is found + */ +static bool xilinx_pcie_dma_valid_device(struct pci_bus *bus, unsigned int devfn) +{ + struct xilinx_pcie_dma *port = bus->sysdata; + + /* Check if link is up when trying to access downstream ports */ + if (bus->number != port->root_busno) + if (!xilinx_pcie_dma_linkup(port)) + return false; + + /* Only one device down on each root port */ + if (bus->number == port->root_busno && devfn > 0) + return false; + + return true; +} + +/** + * xilinx_pcie_dma_map_bus - Get configuration base + * @bus: PCI Bus structure + * @devfn: Device/function + * @where: Offset from base + * + * Return: Base address of the configuration space needed to be + * accessed. + */ +static void __iomem *xilinx_pcie_dma_map_bus(struct pci_bus *bus, + unsigned int devfn, int where) +{ + struct xilinx_pcie_dma *port = bus->sysdata; + int relbus; + + if (!xilinx_pcie_dma_valid_device(bus, devfn)) + return NULL; + + relbus = (bus->number << PCIE_ECAM_BUS_SHIFT) | + (devfn << PCIE_ECAM_DEVFN_SHIFT); + + return port->reg_base + relbus + where; +} + +/* PCIe operations */ +static struct pci_ecam_ops xilinx_pcie_dma_ops = { + .pci_ops = { + .map_bus = xilinx_pcie_dma_map_bus, + .read = pci_generic_config_read, + .write = pci_generic_config_write, + } +}; + +/** + * xilinx_pcie_dma_enable_msi - Enable MSI support + * @port: PCIe port information + */ +static void xilinx_pcie_dma_enable_msi(struct xilinx_pcie_dma *port) +{ + phys_addr_t msi_addr = port->phys_reg_base; + + pcie_write(port, upper_32_bits(msi_addr), XILINX_PCIE_DMA_REG_MSIBASE1); + pcie_write(port, lower_32_bits(msi_addr), XILINX_PCIE_DMA_REG_MSIBASE2); +} + +static void xilinx_mask_leg_irq(struct irq_data *data) +{ + struct xilinx_pcie_dma *port = irq_data_get_irq_chip_data(data); + unsigned long flags; + u32 mask; + u32 val; + + mask = BIT(data->hwirq + XILINX_PCIE_DMA_IDRN_SHIFT); + raw_spin_lock_irqsave(&port->lock, flags); + val = pcie_read(port, XILINX_PCIE_DMA_REG_IDRN_MASK); + pcie_write(port, (val & (~mask)), XILINX_PCIE_DMA_REG_IDRN_MASK); + raw_spin_unlock_irqrestore(&port->lock, flags); +} + +static void xilinx_unmask_leg_irq(struct irq_data *data) +{ + struct xilinx_pcie_dma *port = irq_data_get_irq_chip_data(data); + unsigned long flags; + u32 mask; + u32 val; + + mask = BIT(data->hwirq + XILINX_PCIE_DMA_IDRN_SHIFT); + raw_spin_lock_irqsave(&port->lock, flags); + val = pcie_read(port, XILINX_PCIE_DMA_REG_IDRN_MASK); + pcie_write(port, (val | mask), XILINX_PCIE_DMA_REG_IDRN_MASK); + raw_spin_unlock_irqrestore(&port->lock, flags); +} + +static struct irq_chip xilinx_leg_irq_chip = { + .name = "INTx", + .irq_mask = xilinx_mask_leg_irq, + .irq_unmask = xilinx_unmask_leg_irq, +}; + +/** + * xilinx_pcie_dma_intx_map - Set the handler for the INTx and mark IRQ as valid + * @domain: IRQ domain + * @irq: Virtual IRQ number + * @hwirq: HW interrupt number + * + * Return: Always returns 0. + */ +static int xilinx_pcie_dma_intx_map(struct irq_domain *domain, unsigned int irq, + irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &xilinx_leg_irq_chip, handle_level_irq); + irq_set_chip_data(irq, domain->host_data); + irq_set_status_flags(irq, IRQ_LEVEL); + + return 0; +} + +/* INTx IRQ Domain operations */ +static const struct irq_domain_ops intx_domain_ops = { + .map = xilinx_pcie_dma_intx_map, +}; + +static void xilinx_pcie_dma_handle_msi_irq(struct xilinx_pcie_dma *port, + u32 status_reg) +{ + struct xilinx_msi *msi; + unsigned long status; + u32 bit; + u32 virq; + + msi = &port->msi; + + while ((status = pcie_read(port, status_reg)) != 0) { + for_each_set_bit(bit, &status, 32) { + pcie_write(port, 1 << bit, status_reg); + if (status_reg == XILINX_PCIE_DMA_REG_MSI_HI) + bit = bit + 32; + virq = irq_find_mapping(msi->dev_domain, bit); + if (virq) + generic_handle_irq(virq); + } + } +} + +static void xilinx_pcie_dma_msi_handler_high(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct xilinx_pcie_dma *port = irq_desc_get_handler_data(desc); + + chained_irq_enter(chip, desc); + xilinx_pcie_dma_handle_msi_irq(port, XILINX_PCIE_DMA_REG_MSI_HI); + chained_irq_exit(chip, desc); +} + +static void xilinx_pcie_dma_msi_handler_low(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct xilinx_pcie_dma *port = irq_desc_get_handler_data(desc); + + chained_irq_enter(chip, desc); + xilinx_pcie_dma_handle_msi_irq(port, XILINX_PCIE_DMA_REG_MSI_LOW); + chained_irq_exit(chip, desc); +} + +static void xilinx_pcie_dma_event_flow(struct irq_desc *desc) +{ + struct xilinx_pcie_dma *port = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + unsigned long val; + int i; + + chained_irq_enter(chip, desc); + val = pcie_read(port, XILINX_PCIE_DMA_REG_IDR); + val &= pcie_read(port, XILINX_PCIE_DMA_REG_IMR); + for_each_set_bit(i, &val, 32) + generic_handle_domain_irq(port->pldma_domain, i); + + pcie_write(port, val, XILINX_PCIE_DMA_REG_IDR); + + chained_irq_exit(chip, desc); +} + +#define _IC(x, s) \ + [XILINX_PCIE_DMA_INTR_ ## x] = { __stringify(x), s } + +static const struct { + const char *sym; + const char *str; +} intr_cause[32] = { + _IC(LINK_DOWN, "Link Down"), + _IC(HOT_RESET, "Hot reset"), + _IC(CFG_TIMEOUT, "ECAM access timeout"), + _IC(CORRECTABLE, "Correctable error message"), + _IC(NONFATAL, "Non fatal error message"), + _IC(FATAL, "Fatal error message"), + _IC(INTX, "INTX error message"), + _IC(MSI, "MSI message received"), + _IC(SLV_UNSUPP, "Slave unsupported request"), + _IC(SLV_UNEXP, "Slave unexpected completion"), + _IC(SLV_COMPL, "Slave completion timeout"), + _IC(SLV_ERRP, "Slave Error Poison"), + _IC(SLV_CMPABT, "Slave Completer Abort"), + _IC(SLV_ILLBUR, "Slave Illegal Burst"), + _IC(MST_DECERR, "Master decode error"), + _IC(MST_SLVERR, "Master slave error"), +}; + +static irqreturn_t xilinx_pcie_dma_intr_handler(int irq, void *dev_id) +{ + struct xilinx_pcie_dma *port = (struct xilinx_pcie_dma *)dev_id; + struct device *dev = port->dev; + struct irq_data *d; + + d = irq_domain_get_irq_data(port->pldma_domain, irq); + switch (d->hwirq) { + case XILINX_PCIE_DMA_INTR_CORRECTABLE: + case XILINX_PCIE_DMA_INTR_NONFATAL: + case XILINX_PCIE_DMA_INTR_FATAL: + xilinx_pcie_dma_clear_err_interrupts(port); + fallthrough; + + default: + if (intr_cause[d->hwirq].str) + dev_warn(dev, "%s\n", intr_cause[d->hwirq].str); + else + dev_warn(dev, "Unknown IRQ %ld\n", d->hwirq); + } + + return IRQ_HANDLED; +} + +static struct irq_chip xilinx_msi_irq_chip = { + .name = "xilinx_pcie_dmapcie:msi", + .irq_enable = pci_msi_unmask_irq, + .irq_disable = pci_msi_mask_irq, + .irq_mask = pci_msi_mask_irq, + .irq_unmask = pci_msi_unmask_irq, +}; + +static struct msi_domain_info xilinx_msi_domain_info = { + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | + MSI_FLAG_MULTI_PCI_MSI), + .chip = &xilinx_msi_irq_chip, +}; + +static void xilinx_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) +{ + struct xilinx_pcie_dma *pcie = irq_data_get_irq_chip_data(data); + phys_addr_t msi_addr = pcie->phys_reg_base; + + msg->address_lo = lower_32_bits(msi_addr); + msg->address_hi = upper_32_bits(msi_addr); + msg->data = data->hwirq; +} + +static int xilinx_msi_set_affinity(struct irq_data *irq_data, + const struct cpumask *mask, bool force) +{ + return -EINVAL; +} + +static struct irq_chip xilinx_irq_chip = { + .name = "Xilinx MSI", + .irq_compose_msi_msg = xilinx_compose_msi_msg, + .irq_set_affinity = xilinx_msi_set_affinity, +}; + +static int xilinx_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *args) +{ + struct xilinx_pcie_dma *pcie = domain->host_data; + struct xilinx_msi *msi = &pcie->msi; + int bit; + int i; + + mutex_lock(&msi->lock); + bit = bitmap_find_free_region(msi->bitmap, XILINX_NUM_MSI_IRQS, + get_count_order(nr_irqs)); + if (bit < 0) { + mutex_unlock(&msi->lock); + return -ENOSPC; + } + + for (i = 0; i < nr_irqs; i++) { + irq_domain_set_info(domain, virq + i, bit + i, &xilinx_irq_chip, + domain->host_data, handle_simple_irq, + NULL, NULL); + } + mutex_unlock(&msi->lock); + return 0; +} + +static void xilinx_irq_domain_free(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + struct irq_data *data = irq_domain_get_irq_data(domain, virq); + struct xilinx_pcie_dma *pcie = irq_data_get_irq_chip_data(data); + struct xilinx_msi *msi = &pcie->msi; + + mutex_lock(&msi->lock); + bitmap_release_region(msi->bitmap, data->hwirq, + get_count_order(nr_irqs)); + mutex_unlock(&msi->lock); +} + +static const struct irq_domain_ops dev_msi_domain_ops = { + .alloc = xilinx_irq_domain_alloc, + .free = xilinx_irq_domain_free, +}; + +static void xilinx_pcie_dma_free_interrupts(struct xilinx_pcie_dma *port) +{ + irq_set_chained_handler_and_data(port->msi.irq_msi0, NULL, NULL); + irq_set_chained_handler_and_data(port->msi.irq_msi1, NULL, NULL); +} + +static void xilinx_pcie_dma_free_irq_domains(struct xilinx_pcie_dma *port) +{ + struct xilinx_msi *msi = &port->msi; + + if (port->leg_domain) { + irq_domain_remove(port->leg_domain); + port->leg_domain = NULL; + } + + if (msi->dev_domain) { + irq_domain_remove(msi->dev_domain); + msi->dev_domain = NULL; + } + + if (msi->msi_domain) { + irq_domain_remove(msi->msi_domain); + msi->msi_domain = NULL; + } +} + +static int xilinx_pcie_dma_init_msi_irq_domain(struct xilinx_pcie_dma *port) +{ + struct fwnode_handle *fwnode = of_node_to_fwnode(port->dev->of_node); + struct xilinx_msi *msi = &port->msi; + int size = BITS_TO_LONGS(XILINX_NUM_MSI_IRQS) * sizeof(long); + struct device *dev = port->dev; + + msi->dev_domain = irq_domain_add_linear(NULL, XILINX_NUM_MSI_IRQS, + &dev_msi_domain_ops, port); + if (!msi->dev_domain) + goto out; + + msi->msi_domain = pci_msi_create_irq_domain(fwnode, + &xilinx_msi_domain_info, + msi->dev_domain); + if (!msi->msi_domain) + goto out; + + mutex_init(&msi->lock); + msi->bitmap = kzalloc(size, GFP_KERNEL); + if (!msi->bitmap) + goto out; + + raw_spin_lock_init(&port->lock); + xilinx_pcie_dma_enable_msi(port); + + return 0; + +out: + xilinx_pcie_dma_free_irq_domains(port); + dev_err(dev, "Failed to allocate MSI IRQ domains\n"); + return -ENOMEM; +} + +static void xilinx_pcie_dma_intx_flow(struct irq_desc *desc) +{ + struct xilinx_pcie_dma *port = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + unsigned long val; + int i; + + chained_irq_enter(chip, desc); + + val = FIELD_GET(XILINX_PCIE_DMA_IDRN_MASK, + pcie_read(port, XILINX_PCIE_DMA_REG_IDRN)); + + for_each_set_bit(i, &val, PCI_NUM_INTX) + generic_handle_domain_irq(port->leg_domain, i); + + chained_irq_exit(chip, desc); +} + +static void xilinx_pcie_dma_mask_event_irq(struct irq_data *d) +{ + struct xilinx_pcie_dma *port = irq_data_get_irq_chip_data(d); + u32 val; + + raw_spin_lock(&port->lock); + val = pcie_read(port, XILINX_PCIE_DMA_REG_IMR); + val &= ~BIT(d->hwirq); + pcie_write(port, val, XILINX_PCIE_DMA_REG_IMR); + raw_spin_unlock(&port->lock); +} + +static void xilinx_pcie_dma_unmask_event_irq(struct irq_data *d) +{ + struct xilinx_pcie_dma *port = irq_data_get_irq_chip_data(d); + u32 val; + + raw_spin_lock(&port->lock); + val = pcie_read(port, XILINX_PCIE_DMA_REG_IMR); + val |= BIT(d->hwirq); + pcie_write(port, val, XILINX_PCIE_DMA_REG_IMR); + raw_spin_unlock(&port->lock); +} + +static struct irq_chip xilinx_pcie_dma_event_irq_chip = { + .name = "RC-Event", + .irq_mask = xilinx_pcie_dma_mask_event_irq, + .irq_unmask = xilinx_pcie_dma_unmask_event_irq, +}; + +static int xilinx_pcie_dma_event_map(struct irq_domain *domain, + unsigned int irq, irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &xilinx_pcie_dma_event_irq_chip, + handle_level_irq); + irq_set_chip_data(irq, domain->host_data); + irq_set_status_flags(irq, IRQ_LEVEL); + return 0; +} + +static const struct irq_domain_ops event_domain_ops = { + .map = xilinx_pcie_dma_event_map, +}; + +/** + * xilinx_pcie_dma_init_irq_domain - Initialize IRQ domain + * @port: PCIe port information + * + * Return: '0' on success and error value on failure + */ +static int xilinx_pcie_dma_init_irq_domain(struct xilinx_pcie_dma *port) +{ + struct device *dev = port->dev; + struct device_node *node = dev->of_node; + struct device_node *pcie_intc_node; + int ret; + + /* Setup INTx */ + pcie_intc_node = of_get_next_child(node, NULL); + if (!pcie_intc_node) { + dev_err(dev, "No PCIe Intc node found\n"); + return PTR_ERR(pcie_intc_node); + } + + port->pldma_domain = irq_domain_add_linear(pcie_intc_node, 32, + &event_domain_ops, port); + if (!port->pldma_domain) + goto out; + + irq_domain_update_bus_token(port->pldma_domain, DOMAIN_BUS_NEXUS); + + port->leg_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX, + &intx_domain_ops, + port); + if (!port->leg_domain) { + dev_err(dev, "Failed to get a legacy IRQ domain\n"); + return PTR_ERR(port->leg_domain); + } + + irq_domain_update_bus_token(port->leg_domain, DOMAIN_BUS_WIRED); + + ret = xilinx_pcie_dma_init_msi_irq_domain(port); + if (ret != 0) { + irq_domain_remove(port->leg_domain); + return -ENOMEM; + } + + of_node_put(pcie_intc_node); + raw_spin_lock_init(&port->lock); + + return 0; +out: + return -ENOMEM; +} + +static int xilinx_pcie_dma_setup_irq(struct xilinx_pcie_dma *port) +{ + struct device *dev = port->dev; + struct platform_device *pdev = to_platform_device(dev); + int i, irq; + + port->irq = platform_get_irq(pdev, 0); + if (port->irq < 0) + return port->irq; + + for (i = 0; i < ARRAY_SIZE(intr_cause); i++) { + int err; + + if (!intr_cause[i].str) + continue; + + irq = irq_create_mapping(port->pldma_domain, i); + if (!irq) { + dev_err(dev, "Failed to map interrupt\n"); + return -ENXIO; + } + + err = devm_request_irq(dev, irq, xilinx_pcie_dma_intr_handler, + 0, intr_cause[i].sym, port); + if (err) { + dev_err(dev, "Failed to request IRQ %d\n", irq); + return err; + } + } + + port->intx_irq = irq_create_mapping(port->pldma_domain, + XILINX_PCIE_DMA_INTR_INTX); + if (!port->intx_irq) { + dev_err(dev, "Failed to map INTx interrupt\n"); + return -ENXIO; + } + + /* Plug the INTx chained handler */ + irq_set_chained_handler_and_data(port->intx_irq, + xilinx_pcie_dma_intx_flow, port); + + /* Plug the main event chained handler */ + irq_set_chained_handler_and_data(port->irq, + xilinx_pcie_dma_event_flow, port); + + return 0; +} + +/** + * xilinx_pcie_dma_init_port - Initialize hardware + * @port: PCIe port information + */ +static void xilinx_pcie_dma_init_port(struct xilinx_pcie_dma *port) +{ + if (xilinx_pcie_dma_linkup(port)) + dev_info(port->dev, "PCIe Link is UP\n"); + else + dev_info(port->dev, "PCIe Link is DOWN\n"); + + /* Disable all interrupts */ + pcie_write(port, ~XILINX_PCIE_DMA_IDR_ALL_MASK, + XILINX_PCIE_DMA_REG_IMR); + + /* Clear pending interrupts */ + pcie_write(port, pcie_read(port, XILINX_PCIE_DMA_REG_IDR) & + XILINX_PCIE_DMA_IMR_ALL_MASK, + XILINX_PCIE_DMA_REG_IDR); + + /* Needed for MSI DECODE MODE */ + pcie_write(port, XILINX_PCIE_DMA_IDR_ALL_MASK, XILINX_PCIE_DMA_REG_MSI_LOW_MASK); + pcie_write(port, XILINX_PCIE_DMA_IDR_ALL_MASK, XILINX_PCIE_DMA_REG_MSI_HI_MASK); + + /* Enable the Bridge enable bit */ + pcie_write(port, pcie_read(port, XILINX_PCIE_DMA_REG_RPSC) | + XILINX_PCIE_DMA_REG_RPSC_BEN, + XILINX_PCIE_DMA_REG_RPSC); +} + +static int xilinx_request_msi_irq(struct xilinx_pcie_dma *port) +{ + struct device *dev = port->dev; + struct platform_device *pdev = to_platform_device(dev); + + port->msi.irq_msi0 = platform_get_irq_byname(pdev, "msi0"); + if (port->msi.irq_msi0 <= 0) { + dev_err(dev, "Unable to find msi0 IRQ line\n"); + return port->msi.irq_msi0; + } + + irq_set_chained_handler_and_data(port->msi.irq_msi0, + xilinx_pcie_dma_msi_handler_low, + port); + + port->msi.irq_msi1 = platform_get_irq_byname(pdev, "msi1"); + if (port->msi.irq_msi1 <= 0) { + irq_set_chained_handler_and_data(port->msi.irq_msi0, + NULL, NULL); + dev_err(dev, "Unable to find msi1 IRQ line\n"); + return port->msi.irq_msi1; + } + + irq_set_chained_handler_and_data(port->msi.irq_msi1, + xilinx_pcie_dma_msi_handler_high, + port); + + return 0; +} + +/** + * xilinx_pcie_dma_parse_dt - Parse Device tree + * @port: PCIe port information + * + * Return: '0' on success and error value on failure + */ +static int xilinx_pcie_dma_parse_dt(struct xilinx_pcie_dma *port, + struct resource *bus_range) +{ + struct device *dev = port->dev; + struct device_node *node = dev->of_node; + struct resource regs; + int err; + + err = of_address_to_resource(node, 0, ®s); + if (err) { + dev_err(dev, "missing \"reg\" property\n"); + return err; + } + port->phys_reg_base = regs.start; + + port->cfg = pci_ecam_create(dev, ®s, bus_range, &xilinx_pcie_dma_ops); + if (IS_ERR(port->cfg)) + return -1; + + port->reg_base = port->cfg->win; + + err = xilinx_request_msi_irq(port); + if (err) { + pci_ecam_free(port->cfg); + return err; + } + + return 0; +} + +/** + * xilinx_pcie_dma_probe - Probe function + * @pdev: Platform device pointer + * + * Return: '0' on success and error value on failure + */ +static int xilinx_pcie_dma_probe(struct platform_device *pdev) +{ + struct xilinx_pcie_dma *port; + struct device *dev = &pdev->dev; + struct pci_host_bridge *bridge; + struct resource_entry *bus; + int err; + + bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port)); + if (!bridge) + return -ENODEV; + + port = pci_host_bridge_priv(bridge); + + port->dev = dev; + + bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS); + if (!bus) + return -ENODEV; + + err = xilinx_pcie_dma_parse_dt(port, bus->res); + if (err) { + dev_err(dev, "Parsing DT failed\n"); + return err; + } + + xilinx_pcie_dma_init_port(port); + + err = xilinx_pcie_dma_init_irq_domain(port); + if (err) + goto err_irq_domain; + + err = xilinx_pcie_dma_setup_irq(port); + + bridge->sysdata = port; + bridge->ops = (struct pci_ops *)&xilinx_pcie_dma_ops.pci_ops; + + err = pci_host_probe(bridge); + if (err < 0) + goto err_host_bridge; + + return 0; + +err_host_bridge: + xilinx_pcie_dma_free_irq_domains(port); + +err_irq_domain: + pci_ecam_free(port->cfg); + xilinx_pcie_dma_free_interrupts(port); + return err; +} + +static const struct of_device_id xilinx_pcie_dma_of_match[] = { + { + .compatible = "xlnx,xdma-host-3.00", + }, + {} +}; + +static struct platform_driver xilinx_pcie_dma_driver = { + .driver = { + .name = "xilinx-xdma-pcie", + .of_match_table = xilinx_pcie_dma_of_match, + .suppress_bind_attrs = true, + }, + .probe = xilinx_pcie_dma_probe, +}; + +builtin_platform_driver(xilinx_pcie_dma_driver);