[RFC PATCH v2 16/31] irqchip: Add irq-kvx-itgen driver
Yann Sionneau
ysionneau at kalray.eu
Fri Jan 20 06:09:47 PST 2023
From: Jules Maselbas <jmaselbas at kalray.eu>
The Kalray Core Interrupt Controller is tightly integrated in each kv3
core present in the Coolidge SoC.
It provides the following features:
- 32 independent interrupt sources
- 2-bit configurable priority level
- 2-bit configurable ownership level
Co-developed-by: Clement Leger <clement at clement-leger.fr>
Signed-off-by: Clement Leger <clement at clement-leger.fr>
Co-developed-by: Julian Vetter <jvetter at kalray.eu>
Signed-off-by: Julian Vetter <jvetter at kalray.eu>
Co-developed-by: Vincent Chardon <vincent.chardon at elsys-design.com>
Signed-off-by: Vincent Chardon <vincent.chardon at elsys-design.com>
Signed-off-by: Jules Maselbas <jmaselbas at kalray.eu>
Signed-off-by: Yann Sionneau <ysionneau at kalray.eu>
---
Notes:
V1 -> V2: new patch
- removed header include/linux/irqchip/irq-kvx-apic-gic.h
- header moved to drivers/irqchip/ but in another patch
- removed print on probe success
drivers/irqchip/Kconfig | 8 ++
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-kvx-itgen.c | 236 ++++++++++++++++++++++++++++++++
3 files changed, 245 insertions(+)
create mode 100644 drivers/irqchip/irq-kvx-itgen.c
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 2433e4ba0759..546bc611f3f3 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -340,6 +340,14 @@ config KVX_APIC_GIC
select IRQ_DOMAIN
select IRQ_DOMAIN_HIERARCHY
+config KVX_ITGEN
+ bool
+ depends on KVX
+ select GENERIC_IRQ_IPI if SMP
+ select GENERIC_MSI_IRQ_DOMAIN
+ select IRQ_DOMAIN
+ select IRQ_DOMAIN_HIERARCHY
+
config INGENIC_IRQ
bool
depends on MACH_INGENIC
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 8ac1dd880420..6b8f459d8a21 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_BRCMSTB_L2_IRQ) += irq-brcmstb-l2.o
obj-$(CONFIG_KEYSTONE_IRQ) += irq-keystone.o
obj-$(CONFIG_MIPS_GIC) += irq-mips-gic.o
obj-$(CONFIG_KVX_APIC_GIC) += irq-kvx-apic-gic.o
+obj-$(CONFIG_KVX_ITGEN) += irq-kvx-itgen.o
obj-$(CONFIG_ARCH_MEDIATEK) += irq-mtk-sysirq.o irq-mtk-cirq.o
obj-$(CONFIG_ARCH_DIGICOLOR) += irq-digicolor.o
obj-$(CONFIG_ARCH_SA1100) += irq-sa11x0.o
diff --git a/drivers/irqchip/irq-kvx-itgen.c b/drivers/irqchip/irq-kvx-itgen.c
new file mode 100644
index 000000000000..f6af023a689e
--- /dev/null
+++ b/drivers/irqchip/irq-kvx-itgen.c
@@ -0,0 +1,236 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017-2023 Kalray Inc.
+ * Author(s): Clement Leger
+ * Julian Vetter
+ * Vincent Chardon
+ */
+
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+
+/* Parameters */
+#define KVX_ITGEN_PARAM_OFFSET 0x1100
+#define KVX_ITGEN_PARAM_IT_NUM_OFFSET 0x0
+
+/* Target configuration */
+#define KVX_ITGEN_CFG_ENABLE_OFFSET 0x8
+#define KVX_ITGEN_CFG_ELEM_SIZE 0x10
+#define KVX_ITGEN_CFG_TARGET_OFFSET 0x0
+#define KVX_ITGEN_CFG_TARGET_MAILBOX_SHIFT 0x0
+#define KVX_ITGEN_CFG_TARGET_MAILBOX_MASK 0x7FUL
+#define KVX_ITGEN_CFG_TARGET_CLUSTER_SHIFT 0x8
+#define KVX_ITGEN_CFG_TARGET_CLUSTER_MASK 0x700UL
+#define KVX_ITGEN_CFG_TARGET_SELECT_BIT_SHIFT 0x18
+#define KVX_ITGEN_CFG_TARGET_SELECT_BIT_MASK 0x3F000000UL
+
+#define MB_ADDR_CLUSTER_SHIFT 24
+#define MB_ADDR_MAILBOX_SHIFT 9
+
+/**
+ * struct kvx_itgen - kvx interrupt generator (MSI client)
+ * @base: base address of the itgen controller
+ * @domain: IRQ domain of the controller
+ * @pdev: Platform device associated to the controller
+ */
+struct kvx_itgen {
+ void __iomem *base;
+ struct irq_domain *domain;
+ struct platform_device *pdev;
+};
+
+static void __iomem *get_itgen_cfg_offset(struct kvx_itgen *itgen,
+ irq_hw_number_t hwirq)
+{
+ return itgen->base + KVX_ITGEN_CFG_TARGET_OFFSET +
+ hwirq * KVX_ITGEN_CFG_ELEM_SIZE;
+}
+
+void __iomem *get_itgen_param_offset(struct kvx_itgen *itgen)
+{
+ return itgen->base + KVX_ITGEN_PARAM_OFFSET;
+}
+
+static void kvx_itgen_enable(struct irq_data *data, u32 value)
+{
+ struct kvx_itgen *itgen = irq_data_get_irq_chip_data(data);
+ void __iomem *enable_reg =
+ get_itgen_cfg_offset(itgen, irqd_to_hwirq(data)) +
+ KVX_ITGEN_CFG_ENABLE_OFFSET;
+
+ dev_dbg(&itgen->pdev->dev, "%sabling hwirq %d, addr %p\n",
+ value ? "En" : "Dis",
+ (int) irqd_to_hwirq(data),
+ enable_reg);
+ writel(value, enable_reg);
+}
+
+static void kvx_itgen_mask(struct irq_data *data)
+{
+ kvx_itgen_enable(data, 0x0);
+ irq_chip_mask_parent(data);
+}
+
+static void kvx_itgen_unmask(struct irq_data *data)
+{
+ kvx_itgen_enable(data, 0x1);
+ irq_chip_unmask_parent(data);
+}
+
+#ifdef CONFIG_SMP
+static int kvx_itgen_irq_set_affinity(struct irq_data *data,
+ const struct cpumask *dest, bool force)
+{
+ return -ENOSYS;
+}
+#endif
+
+static struct irq_chip itgen_irq_chip = {
+ .name = "kvx-itgen",
+ .irq_mask = kvx_itgen_mask,
+ .irq_unmask = kvx_itgen_unmask,
+#ifdef CONFIG_SMP
+ .irq_set_affinity = kvx_itgen_irq_set_affinity,
+#endif
+};
+
+#define ITGEN_UNSUPPORTED_TYPES (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)
+
+static int kvx_itgen_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *args)
+{
+ int i, err;
+ struct irq_fwspec *fwspec = args;
+ int hwirq = fwspec->param[0];
+ int type = IRQ_TYPE_NONE;
+ struct kvx_itgen *itgen;
+
+ if (fwspec->param_count >= 2)
+ type = fwspec->param[1];
+
+ WARN_ON(type & ITGEN_UNSUPPORTED_TYPES);
+
+ err = platform_msi_device_domain_alloc(domain, virq, nr_irqs);
+ if (err)
+ return err;
+
+ itgen = platform_msi_get_host_data(domain);
+
+ for (i = 0; i < nr_irqs; i++) {
+ irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+ &itgen_irq_chip, itgen);
+ if (type == IRQ_TYPE_LEVEL_HIGH)
+ irq_set_handler(virq + i, handle_level_irq);
+ }
+
+ return 0;
+}
+
+static const struct irq_domain_ops itgen_domain_ops = {
+ .alloc = kvx_itgen_domain_alloc,
+ .free = irq_domain_free_irqs_common,
+};
+
+static void kvx_itgen_write_msg(struct msi_desc *desc, struct msi_msg *msg)
+{
+ struct irq_data *d = irq_get_irq_data(desc->irq);
+ struct kvx_itgen *itgen = irq_data_get_irq_chip_data(d);
+ uint32_t cfg_val = 0;
+ uintptr_t dest_addr = ((uint64_t) msg->address_hi << 32) |
+ msg->address_lo;
+ void __iomem *cfg = get_itgen_cfg_offset(itgen, irqd_to_hwirq(d));
+
+ /*
+ * Address in the msi data is the address of the targeted mailbox.
+ * To save a few cells of hw, itgen configuration expects the target
+ * of the write using mppa id, cluster id and mailbox id instead
+ * of address.
+ * We extract these informations from the mailbox address.
+ */
+
+ cfg_val |= (((kvx_sfr_get(PCR) & KVX_SFR_PCR_CID_MASK) >>
+ KVX_SFR_PCR_CID_SHIFT)
+ << KVX_ITGEN_CFG_TARGET_CLUSTER_SHIFT);
+ cfg_val |= ((dest_addr >> MB_ADDR_MAILBOX_SHIFT) &
+ KVX_ITGEN_CFG_TARGET_MAILBOX_MASK)
+ << KVX_ITGEN_CFG_TARGET_MAILBOX_SHIFT;
+
+ /*
+ * msg->data contains the bit number to be written and is included in
+ * the itgen config
+ */
+ cfg_val |= ((msg->data << KVX_ITGEN_CFG_TARGET_SELECT_BIT_SHIFT)
+ & KVX_ITGEN_CFG_TARGET_SELECT_BIT_MASK);
+
+ dev_dbg(&itgen->pdev->dev,
+ "Writing dest_addr %lx, value %x to cfg %p\n",
+ dest_addr, cfg_val, cfg);
+
+ writel(cfg_val, cfg);
+}
+
+static int
+kvx_itgen_device_probe(struct platform_device *pdev)
+{
+ struct kvx_itgen *itgen;
+ u32 it_count;
+ struct resource *mem;
+
+ itgen = devm_kzalloc(&pdev->dev, sizeof(*itgen), GFP_KERNEL);
+ if (!itgen)
+ return -ENOMEM;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ itgen->base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(itgen->base)) {
+ dev_err(&pdev->dev, "Failed to ioremap itgen\n");
+ return PTR_ERR(itgen->base);
+ }
+
+ itgen->pdev = pdev;
+ it_count = readl(get_itgen_param_offset(itgen) +
+ KVX_ITGEN_PARAM_IT_NUM_OFFSET);
+
+ itgen->domain = platform_msi_create_device_domain(&pdev->dev,
+ it_count,
+ kvx_itgen_write_msg,
+ &itgen_domain_ops,
+ itgen);
+ if (!itgen->domain) {
+ dev_err(&pdev->dev, "Failed to create device domain\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, itgen);
+
+ return 0;
+}
+
+static const struct of_device_id itgen_of_match[] = {
+ { .compatible = "kalray,kvx-itgen" },
+ { /* END */ }
+};
+MODULE_DEVICE_TABLE(of, itgen_of_match);
+
+static struct platform_driver itgen_platform_driver = {
+ .driver = {
+ .name = "kvx-itgen",
+ .of_match_table = itgen_of_match,
+ },
+ .probe = kvx_itgen_device_probe,
+};
+
+static int __init kvx_itgen_init(void)
+{
+ return platform_driver_register(&itgen_platform_driver);
+}
+
+arch_initcall(kvx_itgen_init);
--
2.37.2
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