This commit adds a simple driver for the Marvell GICP, a hardware unit
that converts memory writes into GIC SPI interrupts. The driver doesn't
do anything but clear all interrupts at boot time, to avoid spurious
interrupts left by the firmware.
The GICP registers are directly written to in hardware by the ICU unit,
which is configured in a separate driver.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/Kconfig | 3 +++
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-mvebu-gicp.c | 53 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 57 insertions(+)
create mode 100644 drivers/irqchip/irq-mvebu-gicp.c
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..4effed4
--- /dev/null
+++ b/drivers/irqchip/irq-mvebu-gicp.c
@@ -0,0 +1,53 @@
+/*
+ * 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/platform_device.h>
+
+#define GICP_SETSPI_NSR_OFFSET 0x0
+#define GICP_CLRSPI_NSR_OFFSET 0x8
+
+#define GICP_INT_COUNT 128
+
+static int mvebu_gicp_probe(struct platform_device *pdev)
+{
+ void __iomem *regs;
+ struct resource *res;
+ int i;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ regs = ioremap(res->start, resource_size(res));
+ if (!regs)
+ return -ENOMEM;
+
+ for (i = 0; i < GICP_INT_COUNT; i++)
+ writel(i, regs + GICP_CLRSPI_NSR_OFFSET);
+
+ iounmap(regs);
+
+ return 0;
+}
+
+static const struct of_device_id mvebu_gicp_of_match[] = {
+ { .compatible = "marvell,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);
--
2.7.4
--
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
