This commit adds a simple driver for the Marvell GICP, a hardware unit
that converts memory writes into GIC SPI interrupts. The driver provides
a number of functions to the ICU driver to allocate GICP interrupts, and
get the physical addresses that the ICUs should write to to set/clear
interrupts.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
drivers/irqchip/Kconfig | 3 +
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-mvebu-gicp.c | 279 +++++++++++++++++++++++++++++++++++++++
drivers/irqchip/irq-mvebu-gicp.h | 12 ++
4 files changed, 295 insertions(+)
create mode 100644 drivers/irqchip/irq-mvebu-gicp.c
create mode 100644 drivers/irqchip/irq-mvebu-gicp.h
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 478f8ac..e527ee5 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -268,6 +268,9 @@ config IRQ_MXS
select IRQ_DOMAIN
select STMP_DEVICE
+config MVEBU_GICP
+ bool
+
config MVEBU_ODMI
bool
select GENERIC_MSI_IRQ_DOMAIN
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index b64c59b..11eb858 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -69,6 +69,7 @@ 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-$(CONFIG_MVEBU_GICP) += irq-mvebu-gicp.o
obj-$(CONFIG_MVEBU_ODMI) += irq-mvebu-odmi.o
obj-$(CONFIG_MVEBU_PIC) += irq-mvebu-pic.o
obj-$(CONFIG_LS_SCFG_MSI) += irq-ls-scfg-msi.o
diff --git a/drivers/irqchip/irq-mvebu-gicp.c b/drivers/irqchip/irq-mvebu-gicp.c
new file mode 100644
index 0000000..45358ac
--- /dev/null
+++ b/drivers/irqchip/irq-mvebu-gicp.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/msi.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+#include "irq-mvebu-gicp.h"
+
+#define GICP_SETSPI_NSR_OFFSET 0x0
+#define GICP_CLRSPI_NSR_OFFSET 0x8
+
+struct mvebu_gicp_spi_range {
+ unsigned int start;
+ unsigned int count;
+};
+
+struct mvebu_gicp {
+ struct mvebu_gicp_spi_range *spi_ranges;
+ unsigned int spi_ranges_cnt;
+ unsigned int spi_cnt;
+ unsigned long *spi_bitmap;
+ spinlock_t spi_lock;
+ struct resource *res;
+ struct device *dev;
+};
+
+static int gicp_idx_to_spi(struct mvebu_gicp *gicp, int idx)
+{
+ int i;
+
+ for (i = 0; i < gicp->spi_ranges_cnt; i++) {
+ struct mvebu_gicp_spi_range *r = &gicp->spi_ranges[i];
+
+ if (idx < r->count)
+ return r->start + idx;
+
+ idx -= r->count;
+ }
+
+ return -EINVAL;
+}
+
+int mvebu_gicp_get_doorbells(struct device_node *dn, phys_addr_t *setspi,
+ phys_addr_t *clrspi)
+{
+ struct platform_device *pdev;
+ struct mvebu_gicp *gicp;
+
+ pdev = of_find_device_by_node(dn);
+ if (!pdev)
+ return -ENODEV;
+
+ gicp = platform_get_drvdata(pdev);
+ if (!gicp)
+ return -ENODEV;
+
+ *setspi = gicp->res->start + GICP_SETSPI_NSR_OFFSET;
+ *clrspi = gicp->res->start + GICP_CLRSPI_NSR_OFFSET;
+
+ return 0;
+}
+
+static void gicp_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct mvebu_gicp *gicp = data->chip_data;
+ phys_addr_t setspi = gicp->res->start + GICP_SETSPI_NSR_OFFSET;
+
+ msg->data = data->hwirq;
+ msg->address_lo = lower_32_bits(setspi);
+ msg->address_hi = upper_32_bits(setspi);
+}
+
+static struct irq_chip gicp_irq_chip = {
+ .name = "GICP",
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_set_affinity = irq_chip_set_affinity_parent,
+ .irq_set_type = irq_chip_set_type_parent,
+ .irq_compose_msi_msg = gicp_compose_msi_msg,
+};
+
+static int gicp_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *args)
+{
+ struct mvebu_gicp *gicp = domain->host_data;
+ struct irq_fwspec fwspec;
+ unsigned int hwirq;
+ int ret;
+
+ spin_lock(&gicp->spi_lock);
+ hwirq = find_first_zero_bit(gicp->spi_bitmap, gicp->spi_cnt);
+ if (hwirq == gicp->spi_cnt) {
+ spin_unlock(&gicp->spi_lock);
+ return -ENOSPC;
+ }
+ __set_bit(hwirq, gicp->spi_bitmap);
+ spin_unlock(&gicp->spi_lock);
+
+ fwspec.fwnode = domain->parent->fwnode;
+ fwspec.param_count = 3;
+ fwspec.param[0] = GIC_SPI;
+ fwspec.param[1] = gicp_idx_to_spi(gicp, hwirq) - 32;
+ /*
+ * Assume edge rising for now, it will be properly set when
+ * ->set_type() is called
+ */
+ fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
+
+ ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
+ if (ret) {
+ dev_err(gicp->dev, "Cannot allocate parent IRQ\n");
+ goto free_hwirq;
+ }
+
+ ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+ &gicp_irq_chip, gicp);
+ if (ret)
+ goto free_irqs_parent;
+
+ return 0;
+
+free_irqs_parent:
+ irq_domain_free_irqs_parent(domain, virq, nr_irqs);
+free_hwirq:
+ spin_lock(&gicp->spi_lock);
+ __clear_bit(hwirq, gicp->spi_bitmap);
+ spin_unlock(&gicp->spi_lock);
+ return ret;
+}
+
+static void gicp_irq_domain_free(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs)
+{
+ struct mvebu_gicp *gicp = domain->host_data;
+ struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+
+ if (d->hwirq >= gicp->spi_cnt) {
+ dev_err(gicp->dev, "Invalid hwirq %lu\n", d->hwirq);
+ return;
+ }
+
+ irq_domain_free_irqs_parent(domain, virq, nr_irqs);
+
+ spin_lock(&gicp->spi_lock);
+ __clear_bit(d->hwirq, gicp->spi_bitmap);
+ spin_unlock(&gicp->spi_lock);
+}
+
+static const struct irq_domain_ops gicp_domain_ops = {
+ .alloc = gicp_irq_domain_alloc,
+ .free = gicp_irq_domain_free,
+};
+
+static struct irq_chip gicp_msi_irq_chip = {
+ .name = "GICP",
+ .irq_set_type = irq_chip_set_type_parent,
+};
+
+static struct msi_domain_ops gicp_msi_ops = {
+};
+
+static struct msi_domain_info gicp_msi_domain_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
+ .ops = &gicp_msi_ops,
+ .chip = &gicp_msi_irq_chip,
+};
+
+static int mvebu_gicp_probe(struct platform_device *pdev)
+{
+ struct mvebu_gicp *gicp;
+ struct irq_domain *inner_domain, *plat_domain, *parent_domain;
+ struct device_node *node = pdev->dev.of_node;
+ struct device_node *irq_parent_dn;
+ int ret, i;
+
+ gicp = devm_kzalloc(&pdev->dev, sizeof(*gicp), GFP_KERNEL);
+ if (!gicp)
+ return -ENOMEM;
+
+ gicp->dev = &pdev->dev;
+
+ gicp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!gicp->res)
+ return -ENODEV;
+
+ ret = of_property_count_u32_elems(node, "marvell,spi-ranges");
+ if (ret < 0)
+ return ret;
+
+ gicp->spi_ranges_cnt = ret / 2;
+
+ gicp->spi_ranges =
+ devm_kzalloc(&pdev->dev,
+ gicp->spi_ranges_cnt *
+ sizeof(struct mvebu_gicp_spi_range),
+ GFP_KERNEL);
+ if (!gicp->spi_ranges)
+ return -ENOMEM;
+
+ for (i = 0; i < gicp->spi_ranges_cnt; i++) {
+ of_property_read_u32_index(node, "marvell,spi-ranges",
+ i * 2,
+ &gicp->spi_ranges[i].start);
+
+ of_property_read_u32_index(node, "marvell,spi-ranges",
+ i * 2 + 1,
+ &gicp->spi_ranges[i].count);
+
+ gicp->spi_cnt += gicp->spi_ranges[i].count;
+ }
+
+ gicp->spi_bitmap = devm_kzalloc(&pdev->dev,
+ BITS_TO_LONGS(gicp->spi_cnt),
+ GFP_KERNEL);
+ if (!gicp->spi_bitmap)
+ return -ENOMEM;
+
+ irq_parent_dn = of_irq_find_parent(node);
+ if (!irq_parent_dn) {
+ dev_err(&pdev->dev, "failed to find parent IRQ node\n");
+ return -ENODEV;
+ }
+
+ parent_domain = irq_find_host(irq_parent_dn);
+ if (!parent_domain) {
+ dev_err(&pdev->dev, "failed to find parent IRQ domain\n");
+ return -ENODEV;
+ }
+
+ inner_domain = irq_domain_create_hierarchy(parent_domain, 0,
+ gicp->spi_cnt,
+ of_node_to_fwnode(node),
+ &gicp_domain_ops, gicp);
+ if (!inner_domain)
+ return -ENOMEM;
+
+
+ plat_domain = platform_msi_create_irq_domain(of_node_to_fwnode(node),
+ &gicp_msi_domain_info,
+ inner_domain);
+ if (!plat_domain) {
+ irq_domain_remove(inner_domain);
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, gicp);
+
+ return 0;
+}
+
+static const struct of_device_id mvebu_gicp_of_match[] = {
+ { .compatible = "marvell,ap806-gicp", },
+ {},
+};
+
+static struct platform_driver mvebu_gicp_driver = {
+ .probe = mvebu_gicp_probe,
+ .driver = {
+ .name = "mvebu-gicp",
+ .of_match_table = mvebu_gicp_of_match,
+ },
+};
+builtin_platform_driver(mvebu_gicp_driver);
diff --git a/drivers/irqchip/irq-mvebu-gicp.h b/drivers/irqchip/irq-mvebu-gicp.h
new file mode 100644
index 0000000..89a8dc2
--- /dev/null
+++ b/drivers/irqchip/irq-mvebu-gicp.h
@@ -0,0 +1,12 @@
+#ifndef __MVEBU_GICP_H__
+#define __MVEBU_GICP_H__
+
+#include <linux/types.h>
+
+struct device_node;
+
+int mvebu_gicp_get_doorbells(struct device_node *dn, phys_addr_t *setspi,
+ phys_addr_t *clrspi);
+
+#endif /* __MVEBU_GICP_H__ */
+
--
2.9.4
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