This commits adds a new irqchip driver that handles the ODMI controller found on Marvell 7K/8K processors. The ODMI controller provide MSI interrupt functionality to on-board peripherals, much like the GIC-v2m. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> --- .../marvell,odmi-controller.txt | 36 +++ drivers/irqchip/Kconfig | 4 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-mvebu-odmi.c | 270 +++++++++++++++++++++ 4 files changed, 311 insertions(+) create mode 100644 Documentation/devicetree/bindings/interrupt-controller/marvell,odmi-controller.txt create mode 100644 drivers/irqchip/irq-mvebu-odmi.c diff --git a/Documentation/devicetree/bindings/interrupt-controller/marvell,odmi-controller.txt b/Documentation/devicetree/bindings/interrupt-controller/marvell,odmi-controller.txt new file mode 100644 index 0000000..a2470af --- /dev/null +++ b/Documentation/devicetree/bindings/interrupt-controller/marvell,odmi-controller.txt @@ -0,0 +1,36 @@ + +* Marvell ODMI for MSI support + +Some Marvell SoCs have an On-Die Message Interrupt (ODMI) controller +which can be used by on-board peripheral for MSI interrupts. + +Required properties: + +- compatible : The value here should contain "marvell,odmi-controller". + +- interrupt,controller : Identifies the node as an interrupt controller. + +- msi-controller : Identifies the node as an MSI controller. + +- marvell,odmi-frames : Number of ODMI frames available. Each frame + provides a number of events. + +- reg : List of register definitions, one for each + ODMI frame. + +- marvell,spi-base : List of GIC base SPI interrupts, one for each + ODMI frame. + +Example: + + odmi: odmi@300000 { + compatible = "marvell,odmi-controller"; + interrupt-controller; + msi-controller; + marvell,odmi-frames = <4>; + reg = <0x300000 0x4000>, + <0x304000 0x4000>, + <0x308000 0x4000>, + <0x30C000 0x4000>; + marvell,spi-base = <128>, <136>, <144>, <152>; + }; diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 715923d..18bed3c 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -217,3 +217,7 @@ config IRQ_MXS def_bool y if MACH_ASM9260 || ARCH_MXS select IRQ_DOMAIN select STMP_DEVICE + +config MVEBU_ODMI + bool + select GENERIC_MSI_IRQ_DOMAIN diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 18caacb..29c388f 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -59,3 +59,4 @@ obj-$(CONFIG_ARCH_SA1100) += irq-sa11x0.o obj-$(CONFIG_INGENIC_IRQ) += irq-ingenic.o obj-$(CONFIG_IMX_GPCV2) += irq-imx-gpcv2.o obj-$(CONFIG_PIC32_EVIC) += irq-pic32-evic.o +obj-$(CONFIG_MVEBU_ODMI) += irq-mvebu-odmi.o diff --git a/drivers/irqchip/irq-mvebu-odmi.c b/drivers/irqchip/irq-mvebu-odmi.c new file mode 100644 index 0000000..c3e00b9 --- /dev/null +++ b/drivers/irqchip/irq-mvebu-odmi.c @@ -0,0 +1,270 @@ +/* + * Copyright (C) 2016 Marvell + * + * Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#define pr_fmt(fmt) "GIC-ODMI: " fmt + +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/irqdomain.h> +#include <linux/kernel.h> +#include <linux/msi.h> +#include <linux/of_address.h> +#include <linux/slab.h> +#include <dt-bindings/interrupt-controller/arm-gic.h> + +#define GICP_ODMIN_SET 0x40 +#define GICP_ODMI_INT_NUM_SHIFT 12 +#define GICP_ODMIN_GM_EP_R0 0x110 +#define GICP_ODMIN_GM_EP_R1 0x114 +#define GICP_ODMIN_GM_EA_R0 0x108 +#define GICP_ODMIN_GM_EA_R1 0x118 + +/* + * We don't support the group events, so we simply have 8 interrupts + * per frame. + */ +#define NODMIS_PER_FRAME 8 + +struct odmi_data { + struct resource res; + void __iomem *base; + unsigned int spi_base; + unsigned long bm; +}; + +static struct odmi_data *odmis; +static unsigned int odmis_count; + +/* + * Lock protecting the allocation bitmap embedded in the odmi_data + * structure. Only one spinlock is used, since allocation/freeing of + * MSI interrupts is infrequent. + */ +static DEFINE_SPINLOCK(odmis_lock); + +static int odmi_set_affinity(struct irq_data *irq_data, + const struct cpumask *mask, bool force) +{ + int ret; + + ret = irq_chip_set_affinity_parent(irq_data, mask, force); + if (ret == IRQ_SET_MASK_OK) + ret = IRQ_SET_MASK_OK_DONE; + + return ret; +} + +static void odmi_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) +{ + struct odmi_data *odmi = NULL; + phys_addr_t addr; + unsigned int odmi_offset, i; + + /* Search the ODMI frame handling this interrupt */ + for (i = 0; i < odmis_count; i++) { + if (data->hwirq >= odmis[i].spi_base && + data->hwirq < (odmis[i].spi_base + NODMIS_PER_FRAME)) { + odmi = &odmis[i]; + break; + } + } + + if (WARN_ON(!odmi)) + return; + + odmi_offset = (data->hwirq - odmi->spi_base); + + addr = odmi->res.start + GICP_ODMIN_SET; + + msg->address_hi = upper_32_bits(addr); + msg->address_lo = lower_32_bits(addr); + msg->data = odmi_offset << GICP_ODMI_INT_NUM_SHIFT; +} + +static struct irq_chip odmi_irq_chip = { + .name = "ODMI", + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_eoi = irq_chip_eoi_parent, + .irq_set_affinity = odmi_set_affinity, + .irq_compose_msi_msg = odmi_compose_msi_msg, +}; + +static int odmi_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *args) +{ + struct odmi_data *odmi = NULL; + struct irq_fwspec fwspec; + struct irq_data *d; + unsigned int offset, hwirq; + int i, ret; + + spin_lock(&odmis_lock); + for (i = 0; i < odmis_count; i++) { + offset = find_first_zero_bit(&odmis[i].bm, NODMIS_PER_FRAME); + if (offset < NODMIS_PER_FRAME) { + __set_bit(offset, &odmis[i].bm); + odmi = &odmis[i]; + break; + } + } + spin_unlock(&odmis_lock); + + if (!odmi) + return -ENOSPC; + + hwirq = odmi->spi_base + offset; + + fwspec.fwnode = domain->parent->fwnode; + fwspec.param_count = 3; + fwspec.param[0] = GIC_SPI; + fwspec.param[1] = hwirq - 32; + fwspec.param[2] = IRQ_TYPE_EDGE_RISING; + + ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec); + if (ret) { + pr_err("Cannot allocate parent IRQ\n"); + spin_lock(&odmis_lock); + __clear_bit(offset, &odmi->bm); + spin_unlock(&odmis_lock); + return ret; + } + + /* Configure the interrupt line to be edge */ + d = irq_domain_get_irq_data(domain->parent, virq); + d->chip->irq_set_type(d, IRQ_TYPE_EDGE_RISING); + + irq_domain_set_hwirq_and_chip(domain, virq, hwirq, + &odmi_irq_chip, NULL); + + return 0; +} + +static void odmi_irq_domain_free(struct irq_domain *domain, + unsigned int virq, unsigned int nr_irqs) +{ + struct irq_data *d = irq_domain_get_irq_data(domain, virq); + struct odmi_data *odmi = NULL; + unsigned int offset; + int i; + + /* + * Check if the hwirq number is valid, and if so, to which + * ODMI frame it belongs + */ + spin_lock(&odmis_lock); + for (i = 0; i < odmis_count; i++) { + if (d->hwirq >= odmis[i].spi_base && + d->hwirq < (odmis[i].spi_base + NODMIS_PER_FRAME)) { + odmi = &odmis[i]; + offset = d->hwirq - odmis[i].spi_base; + break; + } + } + spin_unlock(&odmis_lock); + + if (!odmi) { + pr_err("Failed to teardown msi. Invalid hwirq %lu\n", d->hwirq); + return; + } + + irq_domain_free_irqs_parent(domain, virq, nr_irqs); + + /* Actually free the MSI */ + spin_lock(&odmis_lock); + __clear_bit(offset, &odmi->bm); + spin_unlock(&odmis_lock); +} + +static const struct irq_domain_ops odmi_domain_ops = { + .alloc = odmi_irq_domain_alloc, + .free = odmi_irq_domain_free, +}; + +static struct irq_chip odmi_msi_irq_chip = { + .name = "ODMI", +}; + +static struct msi_domain_ops odmi_msi_ops = { +}; + +static struct msi_domain_info odmi_msi_domain_info = { + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), + .ops = &odmi_msi_ops, + .chip = &odmi_msi_irq_chip, +}; + +static int __init mvebu_odmi_init(struct device_node *node, + struct device_node *parent) +{ + struct irq_domain *inner_domain, *plat_domain; + int ret, i; + + if (of_property_read_u32(node, "marvell,odmi-frames", &odmis_count)) + return -EINVAL; + + odmis = kcalloc(odmis_count, sizeof(struct odmi_data), GFP_KERNEL); + if (!odmis) + return -ENOMEM; + + for (i = 0; i < odmis_count; i++) { + struct odmi_data *odmi = &odmis[i]; + + ret = of_address_to_resource(node, i, &odmi->res); + if (ret) + goto err_unmap; + + odmi->base = of_io_request_and_map(node, i, "odmi"); + if (IS_ERR(odmi->base)) { + ret = PTR_ERR(odmi->base); + goto err_unmap; + } + + if (of_property_read_u32_index(node, "marvell,spi-base", + i, &odmi->spi_base)) { + ret = -EINVAL; + goto err_unmap; + } + } + + inner_domain = irq_domain_create_linear(of_node_to_fwnode(node), + odmis_count * NODMIS_PER_FRAME, + &odmi_domain_ops, NULL); + if (!inner_domain) { + ret = -ENOMEM; + goto err_unmap; + } + + inner_domain->parent = irq_find_host(parent); + + plat_domain = platform_msi_create_irq_domain(of_node_to_fwnode(node), + &odmi_msi_domain_info, + inner_domain); + if (!plat_domain) { + ret = -ENOMEM; + goto err_remove_inner; + } + + return 0; + +err_remove_inner: + irq_domain_remove(inner_domain); +err_unmap: + for (i = 0; i < odmis_count; i++) { + struct odmi_data *odmi = &odmis[i]; + + if (odmi->base && !IS_ERR(odmi->base)) + iounmap(odmis[i].base); + } + kfree(odmis); + return ret; +} + +IRQCHIP_DECLARE(mvebu_odmi, "marvell,odmi-controller", mvebu_odmi_init); -- 2.6.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html