MU support generate irq by write data to a register.
This patch make mu worked as msi controller.
So MU can do doorbell by using standard msi api.
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
drivers/irqchip/Kconfig | 7 +
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-imx-mu-msi.c | 490 +++++++++++++++++++++++++++++++
3 files changed, 498 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..f7193a6c1245e
--- /dev/null
+++ b/drivers/irqchip/irq-imx-mu-msi.c
@@ -0,0 +1,490 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * NXP MU worked as MSI controller
+ *
+ * Copyright (c) 2018 Pengutronix, Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
+ * Copyright 2022 NXP
+ * Frank Li <Frank.Li@xxxxxxx>
+ * Peng Fan <peng.fan@xxxxxxx>
+ *
+ * Based on drivers/mailbox/imx-mailbox.c
+ */
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/spinlock.h>
+#include <linux/dma-iommu.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_domain.h>
+
+
+#define IMX_MU_CHANS 4
+
+enum imx_mu_chan_type {
+ IMX_MU_TYPE_TX, /* Tx */
+ IMX_MU_TYPE_RX, /* Rx */
+ IMX_MU_TYPE_TXDB, /* Tx doorbell */
+ IMX_MU_TYPE_RXDB, /* Rx doorbell */
+};
+
+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,
+ IMX_MU_V2,
+ IMX_MU_V2_S4 = BIT(15),
+};
+
+/* Receive Interrupt Enable */
+#define IMX_MU_xCR_RIEn(type, x) (type & IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x))))
+#define IMX_MU_xSR_RFn(type, x) (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;
+ struct platform_device *pdev;
+ struct irq_domain *parent;
+ struct irq_domain *msi_domain;
+ void __iomem *regs;
+ phys_addr_t msiir_addr;
+ struct imx_mu_dcfg *cfg;
+ u32 msir_num;
+ struct imx_mu_msir *msir;
+ u32 irqs_num;
+ unsigned long used;
+ u32 gic_irq;
+ struct clk *clk;
+ struct device *pd_a;
+ struct device *pd_b;
+ struct device_link *pd_link_a;
+ struct device_link *pd_link_b;
+};
+
+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;
+
+ spin_lock_irqsave(&msi_data->lock, 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]);
+ spin_unlock_irqrestore(&msi_data->lock, flags);
+
+ return val;
+}
+
+static void imx_mu_msi_mask_irq(struct irq_data *data)
+{
+ struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data->parent_data);
+
+ pci_msi_mask_irq(data);
+ imx_mu_xcr_rmw(msi_data, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(msi_data->cfg->type, data->hwirq));
+}
+
+static void imx_mu_msi_unmask_irq(struct irq_data *data)
+{
+ struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data->parent_data);
+
+ pci_msi_unmask_irq(data);
+ imx_mu_xcr_rmw(msi_data, IMX_MU_RCR, IMX_MU_xCR_RIEn(msi_data->cfg->type, data->hwirq), 0);
+}
+
+static struct irq_chip imx_mu_msi_irq_chip = {
+ .name = "MU-MSI",
+ .irq_mask = imx_mu_msi_mask_irq,
+ .irq_unmask = imx_mu_msi_unmask_irq,
+};
+
+static struct msi_domain_ops its_pmsi_ops = {
+};
+
+static struct msi_domain_info imx_mu_msi_domain_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS |
+ MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_PCI_MSIX),
+ .ops = &its_pmsi_ops,
+ .chip = &imx_mu_msi_irq_chip,
+};
+
+static void imx_mu_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data);
+
+ msg->address_hi = upper_32_bits(msi_data->msiir_addr);
+ msg->address_lo = lower_32_bits(msi_data->msiir_addr + 4 * data->hwirq);
+ msg->data = data->hwirq;
+
+ iommu_dma_compose_msi_msg(irq_data_get_msi_desc(data), msg);
+}
+
+static int imx_mu_msi_set_affinity(struct irq_data *irq_data,
+ const struct cpumask *mask, bool force)
+
+{
+ return IRQ_SET_MASK_OK;
+}
+
+static struct irq_chip imx_mu_msi_parent_chip = {
+ .name = "MU",
+ .irq_compose_msi_msg = imx_mu_msi_compose_msg,
+ .irq_set_affinity = imx_mu_msi_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;
+ msi_alloc_info_t *info = args;
+ int pos, err = 0;
+
+ pm_runtime_get_sync(&msi_data->pdev->dev);
+
+ WARN_ON(nr_irqs != 1);
+
+ spin_lock(&msi_data->lock);
+ pos = find_first_zero_bit(&msi_data->used, msi_data->irqs_num);
+ if (pos < msi_data->irqs_num)
+ __set_bit(pos, &msi_data->used);
+ else
+ err = -ENOSPC;
+ spin_unlock(&msi_data->lock);
+
+ if (err)
+ return err;
+
+ err = iommu_dma_prepare_msi(info->desc, msi_data->msiir_addr + pos * 4);
+ if (err)
+ return err;
+
+ irq_domain_set_info(domain, virq, pos,
+ &imx_mu_msi_parent_chip, msi_data,
+ handle_simple_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);
+ int pos;
+
+ pos = d->hwirq;
+ if (pos < 0 || pos >= msi_data->irqs_num) {
+ pr_err("failed to teardown msi. Invalid hwirq %d\n", pos);
+ return;
+ }
+
+ spin_lock(&msi_data->lock);
+ __clear_bit(pos, &msi_data->used);
+ spin_unlock(&msi_data->lock);
+
+ pm_runtime_put(&msi_data->pdev->dev);
+}
+
+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);
+ u32 status;
+ int i;
+
+ status = imx_mu_read(msi_data, msi_data->cfg->xSR[IMX_MU_RSR]);
+
+ chained_irq_enter(irq_desc_get_chip(desc), desc);
+ for (i = 0; i < IMX_MU_CHANS; i++) {
+ if (status & IMX_MU_xSR_RFn(msi_data->cfg->type, i)) {
+ imx_mu_read(msi_data, msi_data->cfg->xRR + i * 4);
+ generic_handle_domain_irq(msi_data->parent, i);
+ }
+ }
+ chained_irq_exit(irq_desc_get_chip(desc), desc);
+}
+
+static int imx_mu_msi_domains_init(struct imx_mu_msi *msi_data)
+{
+ /* Initialize MSI domain parent */
+ msi_data->parent = irq_domain_add_linear(NULL,
+ msi_data->irqs_num,
+ &imx_mu_msi_domain_ops,
+ msi_data);
+ if (!msi_data->parent) {
+ dev_err(&msi_data->pdev->dev, "failed to create IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ msi_data->msi_domain = platform_msi_create_irq_domain(
+ of_node_to_fwnode(msi_data->pdev->dev.of_node),
+ &imx_mu_msi_domain_info,
+ msi_data->parent);
+
+ if (!msi_data->msi_domain) {
+ dev_err(&msi_data->pdev->dev, "failed to create MSI domain\n");
+ irq_domain_remove(msi_data->parent);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int imx_mu_msi_teardown_hwirq(struct imx_mu_msi *msi_data)
+{
+ if (msi_data->gic_irq > 0)
+ irq_set_chained_handler_and_data(msi_data->gic_irq, NULL, NULL);
+
+ return 0;
+}
+
+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 const struct of_device_id imx_mu_msi_ids[] = {
+ { .compatible = "fsl,imx7ulp-mu-msi", .data = &imx_mu_cfg_imx7ulp },
+ { .compatible = "fsl,imx6sx-mu-msi", .data = &imx_mu_cfg_imx6sx },
+ { .compatible = "fsl,imx8ulp-mu-msi", .data = &imx_mu_cfg_imx8ulp },
+ { .compatible = "fsl,imx8ulp-mu-msi-s4", .data = &imx_mu_cfg_imx8ulp_s4 },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, imx_mu_msi_ids);
+
+static int imx_mu_msi_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ struct imx_mu_msi *msi_data, *priv;
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ int ret;
+
+ match = of_match_device(imx_mu_msi_ids, &pdev->dev);
+ if (!match)
+ return -ENODEV;
+
+ priv = msi_data = devm_kzalloc(&pdev->dev, sizeof(*msi_data), GFP_KERNEL);
+ if (!msi_data)
+ return -ENOMEM;
+
+ msi_data->cfg = (struct imx_mu_dcfg *) match->data;
+
+ msi_data->regs = devm_platform_ioremap_resource_byname(pdev, "a");
+ 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, "b");
+ if (!res)
+ return -EIO;
+
+ msi_data->msiir_addr = res->start + msi_data->cfg->xTR;
+
+ msi_data->pdev = pdev;
+ msi_data->irqs_num = IMX_MU_CHANS;
+
+ msi_data->gic_irq = platform_get_irq(msi_data->pdev, 0);
+ if (msi_data->gic_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;
+ }
+
+ ret = clk_prepare_enable(msi_data->clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable clock\n");
+ return ret;
+ }
+
+ priv->pd_a = dev_pm_domain_attach_by_name(dev, "a");
+ if (IS_ERR(priv->pd_a))
+ return PTR_ERR(priv->pd_a);
+
+ priv->pd_link_a = device_link_add(dev, priv->pd_a,
+ DL_FLAG_STATELESS |
+ DL_FLAG_PM_RUNTIME |
+ DL_FLAG_RPM_ACTIVE);
+
+ if (!priv->pd_link_a) {
+ dev_err(dev, "Failed to add device_link to mu a.\n");
+ return -EINVAL;
+ }
+
+ priv->pd_b = dev_pm_domain_attach_by_name(dev, "b");
+ if (IS_ERR(priv->pd_b))
+ return PTR_ERR(priv->pd_b);
+
+ priv->pd_link_b = device_link_add(dev, priv->pd_b,
+ DL_FLAG_STATELESS |
+ DL_FLAG_PM_RUNTIME |
+ DL_FLAG_RPM_ACTIVE);
+
+ if (!priv->pd_link_b) {
+ dev_err(dev, "Failed to add device_link to mu a.\n");
+ return -EINVAL;
+ }
+
+ ret = imx_mu_msi_domains_init(msi_data);
+ if (ret)
+ return ret;
+
+ irq_set_chained_handler_and_data(msi_data->gic_irq,
+ imx_mu_msi_irq_handler,
+ msi_data);
+
+ pm_runtime_enable(dev);
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(dev);
+ goto disable_runtime_pm;
+ }
+
+ ret = pm_runtime_put_sync(dev);
+ if (ret < 0)
+ goto disable_runtime_pm;
+
+ clk_disable_unprepare(msi_data->clk);
+
+ return 0;
+
+disable_runtime_pm:
+ pm_runtime_disable(dev);
+ clk_disable_unprepare(msi_data->clk);
+
+ return ret;
+}
+
+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 imx_mu_msi_remove(struct platform_device *pdev)
+{
+ struct imx_mu_msi *msi_data = platform_get_drvdata(pdev);
+
+ imx_mu_msi_teardown_hwirq(msi_data);
+
+ irq_domain_remove(msi_data->msi_domain);
+ irq_domain_remove(msi_data->parent);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver imx_mu_msi_driver = {
+ .driver = {
+ .name = "imx-mu-msi",
+ .of_match_table = imx_mu_msi_ids,
+ .pm = &imx_mu_pm_ops,
+ },
+ .probe = imx_mu_msi_probe,
+ .remove = imx_mu_msi_remove,
+};
+
+module_platform_driver(imx_mu_msi_driver);
+
+MODULE_AUTHOR("Frank Li <Frank.Li@xxxxxxx>");
+MODULE_DESCRIPTION("Freescale Layerscape SCFG MSI controller driver");
+MODULE_LICENSE("GPL");
--
2.35.1
