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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Code for Fenrir's Loki interrupt controller.
- */
- #include <linux/delay.h>
- #include <linux/irq.h>
- #include <linux/bitops.h>
- #include <linux/module.h>
- #include <linux/moduleparam.h>
- #include <linux/interrupt.h>
- #include <linux/irqdomain.h>
- #include <linux/irqchip.h>
- #include <linux/of.h>
- #include <linux/of_address.h>
- #include <linux/of_irq.h>
- #include <linux/of_platform.h>
- #include <linux/irqchip.h>
- #include <linux/irqdomain.h>
- #include "loki.h"
- static void loki_mask_irq(struct irq_data *d)
- {
- struct loki_drvdata *pdata = irq_data_get_irq_chip_data(d);
- u32 reg = pdata->readreg32(pdata, REG_LOKI_INTERRUPT_ENABLE);
- pdata->writereg32(pdata, REG_LOKI_INTERRUPT_ENABLE, reg & ~(LOKI_INTERRUPT_DUT0));
- }
- static void loki_unmask_irq(struct irq_data *d)
- {
- struct loki_drvdata *pdata = irq_data_get_irq_chip_data(d);
- u32 reg = pdata->readreg32(pdata, REG_LOKI_INTERRUPT_ENABLE);
- pdata->writereg32(pdata, REG_LOKI_INTERRUPT_ENABLE, reg | LOKI_INTERRUPT_DUT0);
- }
- static struct irq_chip fenrir_loki = {
- .name = "loki-intc",
- .irq_mask = loki_mask_irq,
- .irq_unmask = loki_unmask_irq,
- };
- static int loki_intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
- {
- struct irq_chip *chip = &fenrir_loki;
- irq_domain_set_info(d, irq, hw, chip, d->host_data,
- handle_level_irq, NULL, NULL);
- irq_set_status_flags(irq, IRQ_LEVEL);
- return 0;
- }
- static irqreturn_t loki_isrcb(int irq, void *dev_id)
- {
- struct platform_device *pdev = (struct platform_device *)dev_id;
- struct loki_drvdata *pdata;
- u32 reg, mask, timeout;
- if (!pdev) {
- pr_err("LOKI: pdev not set!?\n");
- return IRQ_NONE;
- }
- pdata = platform_get_drvdata(pdev);
- if (!pdata) {
- pr_err("LOKI: pdata not set!?\n");
- return IRQ_NONE;
- }
- reg = pdata->readreg32(pdata, REG_LOKI_INTERRUPT_STATUS);
- mask = pdata->readreg32(pdata, REG_LOKI_INTERRUPT_ENABLE);
- timeout = pdata->readreg32(pdata, REG_LOKI_INTERRUPT_TIMEOUT_CLR);
- dev_dbg(&pdev->dev, "Got an interrupt. %X - %X - %X\n", reg, mask, timeout);
- /* Check the timeout register just in case */
- if (timeout != 0) {
- dev_warn(&pdev->dev, "Interrupt timeout fired. Will need to be reset\n");
- }
- if (reg & mask) {
- if (reg & LOKI_INTERRUPT_TESTINT) {
- dev_warn(&pdev->dev, "Test interrupt fired! Was it on purpose?\n");
- /* Disable the interrupt */
- pdata->writereg32(pdata, REG_LOKI_INTERRUPT_TEST, 0);
- }
- else if (reg & LOKI_INTERRUPT_DUT0) {
- int logical_irq_num;
- /* trigger registered IRQ, if any */
- logical_irq_num = irq_find_mapping(pdata->intc.domain, 0);
- generic_handle_irq(logical_irq_num);
- }
- /* Clear interrupts */
- pdata->writereg32(pdata, REG_LOKI_INTERRUPT_CLR, reg);
- return IRQ_HANDLED;
- }
- return IRQ_NONE;
- }
- static const struct irq_domain_ops loki_intc_ops = {
- .xlate = irq_domain_xlate_onecell,
- .map = loki_intc_map,
- };
- int loki_intc_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct device_node *of_node = pdev->dev.of_node;
- int ret = 0;
- struct loki_drvdata *priv_data = platform_get_drvdata(pdev);;
- dev_dbg(dev, "Going to register loki's intc...");
- /* Setup the interrupt controller */
- priv_data->writereg32(priv_data, REG_LOKI_INTERRUPT_ENABLE, LOKI_INTERRUPT_BASE);
- priv_data->writereg32(priv_data, REG_LOKI_INTERRUPT_CLR, LOKI_INTERRUPT_BASE | LOKI_INTERRUPT_DUT0);
- priv_data->writereg32(priv_data, REG_LOKI_INTERRUPT_TIMEOUT_CLR, 0x2);
- priv_data->intc.irq_num = irq_of_parse_and_map(of_node, 0);
- if (priv_data->intc.irq_num == 0) {
- dev_err(dev, "Could not map IRQ\n");
- ret = -ENXIO;
- goto exit;
- }
- ret = devm_request_irq(dev, priv_data->intc.irq_num, &loki_isrcb, IRQF_SHARED, DEVICE_NAME, pdev);
- if (ret) {
- dev_err(dev, "Failed to request irq\n");
- ret = -ENXIO;
- goto exit;
- }
- priv_data->intc.domain = irq_domain_add_linear(of_node, 1, &loki_intc_ops, priv_data);
- if (!priv_data->intc.domain) {
- dev_err(dev, "Unable to create IRQ domain\n");
- ret = -ENXIO;
- goto exit;
- }
- exit:
- return ret;
- }
- int loki_intc_remove(struct platform_device *pdev)
- {
- struct loki_drvdata *pdata = platform_get_drvdata(pdev);
- irq_dispose_mapping(irq_find_mapping(pdata->intc.domain, 0));
- irq_domain_remove(pdata->intc.domain);
- return 0;
- }
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