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lorenzo.pieralisi@arm.com, ntb@lists.linux.dev, lznuaa@gmail.com Subject: [PATCH v5 2/4] irqchip: Add IMX MU MSI controller driver Date: Mon, 15 Aug 2022 16:39:34 -0500 Message-Id: <20220815213936.2380439-3-Frank.Li@nxp.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220815213936.2380439-1-Frank.Li@nxp.com> References: <20220815213936.2380439-1-Frank.Li@nxp.com> X-ClientProxiedBy: CY5PR15CA0006.namprd15.prod.outlook.com (2603:10b6:930:14::9) To PAXPR04MB9186.eurprd04.prod.outlook.com (2603:10a6:102:232::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 52133588-543a-4708-9ad3-08da7f06b93d X-MS-TrafficTypeDiagnostic: AM5PR0401MB2580:EE_ 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-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 52133588-543a-4708-9ad3-08da7f06b93d X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB9186.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Aug 2022 21:40:08.2106 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: E2WPF5sVKnayhiAWSOaa6d3QASfP3Co7aP5uj3lrNUysKfb02oiOH7qUzo/cB9H/adQG74dJO45NyYEAN9XDFQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0401MB2580 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The MU block found in a number of Freescale/NXP SoCs supports generating IRQs by writing data to a register This enables the MU block to be used as a MSI controller, by leveraging the platform-MSI API Signed-off-by: Frank Li --- drivers/irqchip/Kconfig | 7 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-imx-mu-msi.c | 451 +++++++++++++++++++++++++++++++ 3 files changed, 459 insertions(+) create mode 100644 drivers/irqchip/irq-imx-mu-msi.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 5e4e50122777d..4599471d880c0 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -470,6 +470,13 @@ config IMX_INTMUX help Support for the i.MX INTMUX interrupt multiplexer. +config IMX_MU_MSI + bool "i.MX MU work as MSI controller" + default y if ARCH_MXC + select IRQ_DOMAIN + help + MU work as MSI controller to do general doorbell + config LS1X_IRQ bool "Loongson-1 Interrupt Controller" depends on MACH_LOONGSON32 diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 5d8e21d3dc6d8..870423746c783 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -98,6 +98,7 @@ obj-$(CONFIG_RISCV_INTC) += irq-riscv-intc.o obj-$(CONFIG_SIFIVE_PLIC) += irq-sifive-plic.o obj-$(CONFIG_IMX_IRQSTEER) += irq-imx-irqsteer.o obj-$(CONFIG_IMX_INTMUX) += irq-imx-intmux.o +obj-$(CONFIG_IMX_MU_MSI) += irq-imx-mu-msi.o obj-$(CONFIG_MADERA_IRQ) += irq-madera.o obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o diff --git a/drivers/irqchip/irq-imx-mu-msi.c b/drivers/irqchip/irq-imx-mu-msi.c new file mode 100644 index 0000000000000..1930c47c3570d --- /dev/null +++ b/drivers/irqchip/irq-imx-mu-msi.c @@ -0,0 +1,451 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Freescale MU worked as MSI controller + * + * Copyright (c) 2018 Pengutronix, Oleksij Rempel + * Copyright 2022 NXP + * Frank Li + * Peng Fan + * + * Based on drivers/mailbox/imx-mailbox.c + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#define IMX_MU_CHANS 4 + +enum imx_mu_xcr { + IMX_MU_GIER, + IMX_MU_GCR, + IMX_MU_TCR, + IMX_MU_RCR, + IMX_MU_xCR_MAX, +}; + +enum imx_mu_xsr { + IMX_MU_SR, + IMX_MU_GSR, + IMX_MU_TSR, + IMX_MU_RSR, +}; + +enum imx_mu_type { + IMX_MU_V1 = BIT(0), + IMX_MU_V2 = BIT(1), + IMX_MU_V2_S4 = BIT(15), +}; + +/* Receive Interrupt Enable */ +#define IMX_MU_xCR_RIEn(data, x) ((data->cfg->type) & IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x)))) +#define IMX_MU_xSR_RFn(data, x) ((data->cfg->type) & IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x)))) + +struct imx_mu_dcfg { + enum imx_mu_type type; + u32 xTR; /* Transmit Register0 */ + u32 xRR; /* Receive Register0 */ + u32 xSR[4]; /* Status Registers */ + u32 xCR[4]; /* Control Registers */ +}; + +struct imx_mu_msi { + spinlock_t lock; + raw_spinlock_t reglock; + struct irq_domain *msi_domain; + void __iomem *regs; + phys_addr_t msiir_addr; + const struct imx_mu_dcfg *cfg; + unsigned long used; + struct clk *clk; +}; + +static void imx_mu_write(struct imx_mu_msi *msi_data, u32 val, u32 offs) +{ + iowrite32(val, msi_data->regs + offs); +} + +static u32 imx_mu_read(struct imx_mu_msi *msi_data, u32 offs) +{ + return ioread32(msi_data->regs + offs); +} + +static u32 imx_mu_xcr_rmw(struct imx_mu_msi *msi_data, enum imx_mu_xcr type, u32 set, u32 clr) +{ + unsigned long flags; + u32 val; + + raw_spin_lock_irqsave(&msi_data->reglock, flags); + val = imx_mu_read(msi_data, msi_data->cfg->xCR[type]); + val &= ~clr; + val |= set; + imx_mu_write(msi_data, val, msi_data->cfg->xCR[type]); + raw_spin_unlock_irqrestore(&msi_data->reglock, flags); + + return val; +} + +static void imx_mu_msi_parent_mask_irq(struct irq_data *data) +{ + struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data); + + imx_mu_xcr_rmw(msi_data, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(msi_data, data->hwirq)); +} + +static void imx_mu_msi_parent_unmask_irq(struct irq_data *data) +{ + struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data); + + imx_mu_xcr_rmw(msi_data, IMX_MU_RCR, IMX_MU_xCR_RIEn(msi_data, data->hwirq), 0); +} + +static void imx_mu_msi_parent_ack_irq(struct irq_data *data) +{ + struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data); + + imx_mu_read(msi_data, msi_data->cfg->xRR + data->hwirq * 4); +} + +static struct irq_chip imx_mu_msi_irq_chip = { + .name = "MU-MSI", + .irq_ack = irq_chip_ack_parent, +}; + +static struct msi_domain_ops imx_mu_msi_irq_ops = { +}; + +static struct msi_domain_info imx_mu_msi_domain_info = { + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), + .ops = &imx_mu_msi_irq_ops, + .chip = &imx_mu_msi_irq_chip, +}; + +static void imx_mu_msi_parent_compose_msg(struct irq_data *data, + struct msi_msg *msg) +{ + struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data); + u64 addr = msi_data->msiir_addr + 4 * data->hwirq; + + msg->address_hi = upper_32_bits(addr); + msg->address_lo = lower_32_bits(addr); + msg->data = data->hwirq; +} + +static int imx_mu_msi_parent_set_affinity(struct irq_data *irq_data, + const struct cpumask *mask, bool force) +{ + return -EINVAL; +} + +static struct irq_chip imx_mu_msi_parent_chip = { + .name = "MU", + .irq_mask = imx_mu_msi_parent_mask_irq, + .irq_unmask = imx_mu_msi_parent_unmask_irq, + .irq_ack = imx_mu_msi_parent_ack_irq, + .irq_compose_msi_msg = imx_mu_msi_parent_compose_msg, + .irq_set_affinity = imx_mu_msi_parent_set_affinity, +}; + +static int imx_mu_msi_domain_irq_alloc(struct irq_domain *domain, + unsigned int virq, + unsigned int nr_irqs, + void *args) +{ + struct imx_mu_msi *msi_data = domain->host_data; + unsigned long flags; + int pos, err = 0; + + WARN_ON(nr_irqs != 1); + + spin_lock_irqsave(&msi_data->lock, flags); + pos = find_first_zero_bit(&msi_data->used, IMX_MU_CHANS); + if (pos < IMX_MU_CHANS) + __set_bit(pos, &msi_data->used); + else + err = -ENOSPC; + spin_unlock_irqrestore(&msi_data->lock, flags); + + if (err) + return err; + + irq_domain_set_info(domain, virq, pos, + &imx_mu_msi_parent_chip, msi_data, + handle_edge_irq, NULL, NULL); + return 0; +} + +static void imx_mu_msi_domain_irq_free(struct irq_domain *domain, + unsigned int virq, unsigned int nr_irqs) +{ + struct irq_data *d = irq_domain_get_irq_data(domain, virq); + struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(d); + unsigned long flags; + + spin_lock_irqsave(&msi_data->lock, flags); + __clear_bit(d->hwirq, &msi_data->used); + spin_unlock_irqrestore(&msi_data->lock, flags); +} + +static const struct irq_domain_ops imx_mu_msi_domain_ops = { + .alloc = imx_mu_msi_domain_irq_alloc, + .free = imx_mu_msi_domain_irq_free, +}; + +static void imx_mu_msi_irq_handler(struct irq_desc *desc) +{ + struct imx_mu_msi *msi_data = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + u32 status; + int i; + + status = imx_mu_read(msi_data, msi_data->cfg->xSR[IMX_MU_RSR]); + + chained_irq_enter(chip, desc); + for (i = 0; i < IMX_MU_CHANS; i++) { + if (status & IMX_MU_xSR_RFn(msi_data, i)) + generic_handle_domain_irq(msi_data->msi_domain, i); + } + chained_irq_exit(chip, desc); +} + +static int imx_mu_msi_domains_init(struct imx_mu_msi *msi_data, struct device *dev) +{ + struct fwnode_handle *fwnodes = dev_fwnode(dev); + struct irq_domain *parent; + + /* Initialize MSI domain parent */ + parent = irq_domain_create_linear(fwnodes, + IMX_MU_CHANS, + &imx_mu_msi_domain_ops, + msi_data); + if (!parent) { + dev_err(dev, "failed to create IRQ domain\n"); + return -ENOMEM; + } + + irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS); + + msi_data->msi_domain = platform_msi_create_irq_domain( + fwnodes, + &imx_mu_msi_domain_info, + parent); + + if (!msi_data->msi_domain) { + dev_err(dev, "failed to create MSI domain\n"); + irq_domain_remove(parent); + return -ENOMEM; + } + + irq_domain_set_pm_device(msi_data->msi_domain, dev); + + return 0; +} + +/* Register offset of different version MU IP */ +static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = { + .xTR = 0x0, + .xRR = 0x10, + .xSR = {0x20, 0x20, 0x20, 0x20}, + .xCR = {0x24, 0x24, 0x24, 0x24}, +}; + +static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = { + .xTR = 0x20, + .xRR = 0x40, + .xSR = {0x60, 0x60, 0x60, 0x60}, + .xCR = {0x64, 0x64, 0x64, 0x64}, +}; + +static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp = { + .type = IMX_MU_V2, + .xTR = 0x200, + .xRR = 0x280, + .xSR = {0xC, 0x118, 0x124, 0x12C}, + .xCR = {0x110, 0x114, 0x120, 0x128}, +}; + +static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp_s4 = { + + .type = IMX_MU_V2 | IMX_MU_V2_S4, + .xTR = 0x200, + .xRR = 0x280, + .xSR = {0xC, 0x118, 0x124, 0x12C}, + .xCR = {0x110, 0x114, 0x120, 0x128}, +}; + +static int __init imx_mu_of_init(struct device_node *dn, + struct device_node *parent, + const struct imx_mu_dcfg *cfg + ) +{ + struct platform_device *pdev = of_find_device_by_node(dn); + struct imx_mu_msi *msi_data, *priv; + struct device_link *pd_link_a; + struct device_link *pd_link_b; + struct resource *res; + struct device *pd_a; + struct device *pd_b; + struct device *dev; + int ret; + int irq; + + if (!pdev) + return -ENODEV; + + dev = &pdev->dev; + + priv = msi_data = devm_kzalloc(&pdev->dev, sizeof(*msi_data), GFP_KERNEL); + if (!msi_data) + return -ENOMEM; + + msi_data->cfg = cfg; + + msi_data->regs = devm_platform_ioremap_resource_byname(pdev, "processor a-facing"); + if (IS_ERR(msi_data->regs)) { + dev_err(&pdev->dev, "failed to initialize 'regs'\n"); + return PTR_ERR(msi_data->regs); + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "processor b-facing"); + if (!res) + return -EIO; + + msi_data->msiir_addr = res->start + msi_data->cfg->xTR; + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) + return -ENODEV; + + platform_set_drvdata(pdev, msi_data); + + msi_data->clk = devm_clk_get(dev, NULL); + if (IS_ERR(msi_data->clk)) { + if (PTR_ERR(msi_data->clk) != -ENOENT) + return PTR_ERR(msi_data->clk); + + msi_data->clk = NULL; + } + + pd_a = dev_pm_domain_attach_by_name(dev, "processor a-facing"); + if (IS_ERR(pd_a)) + return PTR_ERR(pd_a); + + pd_b = dev_pm_domain_attach_by_name(dev, "processor b-facing"); + if (IS_ERR(pd_b)) + return PTR_ERR(pd_b); + + pd_link_a = device_link_add(dev, pd_a, + DL_FLAG_STATELESS | + DL_FLAG_PM_RUNTIME | + DL_FLAG_RPM_ACTIVE); + + if (!pd_link_a) { + dev_err(dev, "Failed to add device_link to mu a.\n"); + goto err_pd_a; + } + + pd_link_b = device_link_add(dev, pd_b, + DL_FLAG_STATELESS | + DL_FLAG_PM_RUNTIME | + DL_FLAG_RPM_ACTIVE); + + + if (!pd_link_b) { + dev_err(dev, "Failed to add device_link to mu a.\n"); + goto err_pd_b; + } + + ret = imx_mu_msi_domains_init(msi_data, dev); + if (ret) + goto err_dm_init; + + irq_set_chained_handler_and_data(irq, + imx_mu_msi_irq_handler, + msi_data); + + pm_runtime_enable(dev); + + return 0; + +err_dm_init: + device_link_remove(dev, pd_b); +err_pd_b: + device_link_remove(dev, pd_a); +err_pd_a: + return -EINVAL; +} + +static int __maybe_unused imx_mu_runtime_suspend(struct device *dev) +{ + struct imx_mu_msi *priv = dev_get_drvdata(dev); + + clk_disable_unprepare(priv->clk); + + return 0; +} + +static int __maybe_unused imx_mu_runtime_resume(struct device *dev) +{ + struct imx_mu_msi *priv = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(priv->clk); + if (ret) + dev_err(dev, "failed to enable clock\n"); + + return ret; +} + +static const struct dev_pm_ops imx_mu_pm_ops = { + SET_RUNTIME_PM_OPS(imx_mu_runtime_suspend, + imx_mu_runtime_resume, NULL) +}; + +static int __init imx_mu_imx7ulp_of_init(struct device_node *dn, + struct device_node *parent) +{ + return imx_mu_of_init(dn, parent, &imx_mu_cfg_imx7ulp); +} + +static int __init imx_mu_imx6sx_of_init(struct device_node *dn, + struct device_node *parent) +{ + return imx_mu_of_init(dn, parent, &imx_mu_cfg_imx6sx); +} + +static int __init imx_mu_imx8ulp_of_init(struct device_node *dn, + struct device_node *parent) +{ + return imx_mu_of_init(dn, parent, &imx_mu_cfg_imx8ulp); +} + +static int __init imx_mu_imx8ulp_s4_of_init(struct device_node *dn, + struct device_node *parent) +{ + return imx_mu_of_init(dn, parent, &imx_mu_cfg_imx8ulp_s4); +} + +IRQCHIP_PLATFORM_DRIVER_BEGIN(imx_mu_msi) +IRQCHIP_MATCH("fsl,imx7ulp-mu-msi", imx_mu_imx7ulp_of_init) +IRQCHIP_MATCH("fsl,imx6sx-mu-msi", imx_mu_imx6sx_of_init) +IRQCHIP_MATCH("fsl,imx8ulp-mu-msi", imx_mu_imx8ulp_of_init) +IRQCHIP_MATCH("fsl,imx8ulp-mu-msi-s4", imx_mu_imx8ulp_s4_of_init) +IRQCHIP_PLATFORM_DRIVER_END(imx_mu_msi, .pm = &imx_mu_pm_ops) + + +MODULE_AUTHOR("Frank Li "); +MODULE_DESCRIPTION("Freescale MU MSI controller driver"); +MODULE_LICENSE("GPL"); From patchwork Mon Aug 15 21:39:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 597686 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3EEFCC25B0F for ; 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Provide msi controller support so other driver such as PCI EP can use it by standard msi interface as doorbell. Signed-off-by: Frank Li --- .../interrupt-controller/fsl,mu-msi.yaml | 98 +++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 Documentation/devicetree/bindings/interrupt-controller/fsl,mu-msi.yaml diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-msi.yaml b/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-msi.yaml new file mode 100644 index 0000000000000..ac07b138e24c0 --- /dev/null +++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-msi.yaml @@ -0,0 +1,98 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/interrupt-controller/fsl,mu-msi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Freescale/NXP i.MX Messaging Unit (MU) work as msi controller + +maintainers: + - Frank Li + +description: | + The Messaging Unit module enables two processors within the SoC to + communicate and coordinate by passing messages (e.g. data, status + and control) through the MU interface. The MU also provides the ability + for one processor (A side) to signal the other processor (B side) using + interrupts. + + Because the MU manages the messaging between processors, the MU uses + different clocks (from each side of the different peripheral buses). + Therefore, the MU must synchronize the accesses from one side to the + other. The MU accomplishes synchronization using two sets of matching + registers (Processor A-facing, Processor B-facing). + + MU can work as msi interrupt controller to do doorbell + +allOf: + - $ref: /schemas/interrupt-controller/msi-controller.yaml# + +properties: + compatible: + enum: + - fsl,imx6sx-mu-msi + - fsl,imx7ulp-mu-msi + - fsl,imx8ulp-mu-msi + - fsl,imx8ulp-mu-msi-s4 + + reg: + items: + - description: a side register base address + - description: b side register base address + + reg-names: + items: + - const: processor a-facing + - const: processor b-facing + + interrupts: + description: a side interrupt number. + maxItems: 1 + + clocks: + maxItems: 1 + + power-domains: + items: + - description: a side power domain + - description: b side power domain + + power-domain-names: + items: + - const: processor a-facing + - const: processor b-facing + + interrupt-controller: true + + msi-controller: true + + "#msi-cells": + const: 0 + +required: + - compatible + - reg + - interrupts + - interrupt-controller + - msi-controller + +additionalProperties: false + +examples: + - | + #include + #include + + msi-controller@5d270000 { + compatible = "fsl,imx6sx-mu-msi"; + msi-controller; + #msi-cells = <0>; + interrupt-controller; + reg = <0x5d270000 0x10000>, /* A side */ + <0x5d300000 0x10000>; /* B side */ + reg-names = "processor a-facing", "processor b-facing"; + interrupts = ; + power-domains = <&pd IMX_SC_R_MU_12A>, + <&pd IMX_SC_R_MU_12B>; + power-domain-names = "processor a-facing", "processor b-facing"; + };