123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308 |
- /*
- * Renesas IRQC Driver
- *
- * Copyright (C) 2013 Magnus Damm
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include <linux/clk.h>
- #include <linux/init.h>
- #include <linux/platform_device.h>
- #include <linux/spinlock.h>
- #include <linux/interrupt.h>
- #include <linux/ioport.h>
- #include <linux/io.h>
- #include <linux/irq.h>
- #include <linux/irqdomain.h>
- #include <linux/err.h>
- #include <linux/slab.h>
- #include <linux/module.h>
- #include <linux/pm_runtime.h>
- #define IRQC_IRQ_MAX 32 /* maximum 32 interrupts per driver instance */
- #define IRQC_REQ_STS 0x00 /* Interrupt Request Status Register */
- #define IRQC_EN_STS 0x04 /* Interrupt Enable Status Register */
- #define IRQC_EN_SET 0x08 /* Interrupt Enable Set Register */
- #define IRQC_INT_CPU_BASE(n) (0x000 + ((n) * 0x10))
- /* SYS-CPU vs. RT-CPU */
- #define DETECT_STATUS 0x100 /* IRQn Detect Status Register */
- #define MONITOR 0x104 /* IRQn Signal Level Monitor Register */
- #define HLVL_STS 0x108 /* IRQn High Level Detect Status Register */
- #define LLVL_STS 0x10c /* IRQn Low Level Detect Status Register */
- #define S_R_EDGE_STS 0x110 /* IRQn Sync Rising Edge Detect Status Reg. */
- #define S_F_EDGE_STS 0x114 /* IRQn Sync Falling Edge Detect Status Reg. */
- #define A_R_EDGE_STS 0x118 /* IRQn Async Rising Edge Detect Status Reg. */
- #define A_F_EDGE_STS 0x11c /* IRQn Async Falling Edge Detect Status Reg. */
- #define CHTEN_STS 0x120 /* Chattering Reduction Status Register */
- #define IRQC_CONFIG(n) (0x180 + ((n) * 0x04))
- /* IRQn Configuration Register */
- struct irqc_irq {
- int hw_irq;
- int requested_irq;
- struct irqc_priv *p;
- };
- struct irqc_priv {
- void __iomem *iomem;
- void __iomem *cpu_int_base;
- struct irqc_irq irq[IRQC_IRQ_MAX];
- unsigned int number_of_irqs;
- struct platform_device *pdev;
- struct irq_chip_generic *gc;
- struct irq_domain *irq_domain;
- struct clk *clk;
- };
- static struct irqc_priv *irq_data_to_priv(struct irq_data *data)
- {
- return data->domain->host_data;
- }
- static void irqc_dbg(struct irqc_irq *i, char *str)
- {
- dev_dbg(&i->p->pdev->dev, "%s (%d:%d)\n",
- str, i->requested_irq, i->hw_irq);
- }
- static unsigned char irqc_sense[IRQ_TYPE_SENSE_MASK + 1] = {
- [IRQ_TYPE_LEVEL_LOW] = 0x01,
- [IRQ_TYPE_LEVEL_HIGH] = 0x02,
- [IRQ_TYPE_EDGE_FALLING] = 0x04, /* Synchronous */
- [IRQ_TYPE_EDGE_RISING] = 0x08, /* Synchronous */
- [IRQ_TYPE_EDGE_BOTH] = 0x0c, /* Synchronous */
- };
- static int irqc_irq_set_type(struct irq_data *d, unsigned int type)
- {
- struct irqc_priv *p = irq_data_to_priv(d);
- int hw_irq = irqd_to_hwirq(d);
- unsigned char value = irqc_sense[type & IRQ_TYPE_SENSE_MASK];
- u32 tmp;
- irqc_dbg(&p->irq[hw_irq], "sense");
- if (!value)
- return -EINVAL;
- tmp = ioread32(p->iomem + IRQC_CONFIG(hw_irq));
- tmp &= ~0x3f;
- tmp |= value;
- iowrite32(tmp, p->iomem + IRQC_CONFIG(hw_irq));
- return 0;
- }
- static int irqc_irq_set_wake(struct irq_data *d, unsigned int on)
- {
- struct irqc_priv *p = irq_data_to_priv(d);
- int hw_irq = irqd_to_hwirq(d);
- irq_set_irq_wake(p->irq[hw_irq].requested_irq, on);
- if (!p->clk)
- return 0;
- if (on)
- clk_enable(p->clk);
- else
- clk_disable(p->clk);
- return 0;
- }
- static irqreturn_t irqc_irq_handler(int irq, void *dev_id)
- {
- struct irqc_irq *i = dev_id;
- struct irqc_priv *p = i->p;
- u32 bit = BIT(i->hw_irq);
- irqc_dbg(i, "demux1");
- if (ioread32(p->iomem + DETECT_STATUS) & bit) {
- iowrite32(bit, p->iomem + DETECT_STATUS);
- irqc_dbg(i, "demux2");
- generic_handle_irq(irq_find_mapping(p->irq_domain, i->hw_irq));
- return IRQ_HANDLED;
- }
- return IRQ_NONE;
- }
- static int irqc_probe(struct platform_device *pdev)
- {
- struct irqc_priv *p;
- struct resource *io;
- struct resource *irq;
- const char *name = dev_name(&pdev->dev);
- int ret;
- int k;
- p = kzalloc(sizeof(*p), GFP_KERNEL);
- if (!p) {
- dev_err(&pdev->dev, "failed to allocate driver data\n");
- ret = -ENOMEM;
- goto err0;
- }
- p->pdev = pdev;
- platform_set_drvdata(pdev, p);
- p->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(p->clk)) {
- dev_warn(&pdev->dev, "unable to get clock\n");
- p->clk = NULL;
- }
- pm_runtime_enable(&pdev->dev);
- pm_runtime_get_sync(&pdev->dev);
- /* get hold of manadatory IOMEM */
- io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!io) {
- dev_err(&pdev->dev, "not enough IOMEM resources\n");
- ret = -EINVAL;
- goto err1;
- }
- /* allow any number of IRQs between 1 and IRQC_IRQ_MAX */
- for (k = 0; k < IRQC_IRQ_MAX; k++) {
- irq = platform_get_resource(pdev, IORESOURCE_IRQ, k);
- if (!irq)
- break;
- p->irq[k].p = p;
- p->irq[k].hw_irq = k;
- p->irq[k].requested_irq = irq->start;
- }
- p->number_of_irqs = k;
- if (p->number_of_irqs < 1) {
- dev_err(&pdev->dev, "not enough IRQ resources\n");
- ret = -EINVAL;
- goto err1;
- }
- /* ioremap IOMEM and setup read/write callbacks */
- p->iomem = ioremap_nocache(io->start, resource_size(io));
- if (!p->iomem) {
- dev_err(&pdev->dev, "failed to remap IOMEM\n");
- ret = -ENXIO;
- goto err2;
- }
- p->cpu_int_base = p->iomem + IRQC_INT_CPU_BASE(0); /* SYS-SPI */
- p->irq_domain = irq_domain_add_linear(pdev->dev.of_node,
- p->number_of_irqs,
- &irq_generic_chip_ops, p);
- if (!p->irq_domain) {
- ret = -ENXIO;
- dev_err(&pdev->dev, "cannot initialize irq domain\n");
- goto err2;
- }
- ret = irq_alloc_domain_generic_chips(p->irq_domain, p->number_of_irqs,
- 1, name, handle_level_irq,
- 0, 0, IRQ_GC_INIT_NESTED_LOCK);
- if (ret) {
- dev_err(&pdev->dev, "cannot allocate generic chip\n");
- goto err3;
- }
- p->gc = irq_get_domain_generic_chip(p->irq_domain, 0);
- p->gc->reg_base = p->cpu_int_base;
- p->gc->chip_types[0].regs.enable = IRQC_EN_SET;
- p->gc->chip_types[0].regs.disable = IRQC_EN_STS;
- p->gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg;
- p->gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg;
- p->gc->chip_types[0].chip.irq_set_type = irqc_irq_set_type;
- p->gc->chip_types[0].chip.irq_set_wake = irqc_irq_set_wake;
- p->gc->chip_types[0].chip.flags = IRQCHIP_MASK_ON_SUSPEND;
- /* request interrupts one by one */
- for (k = 0; k < p->number_of_irqs; k++) {
- if (request_irq(p->irq[k].requested_irq, irqc_irq_handler,
- 0, name, &p->irq[k])) {
- dev_err(&pdev->dev, "failed to request IRQ\n");
- ret = -ENOENT;
- goto err4;
- }
- }
- dev_info(&pdev->dev, "driving %d irqs\n", p->number_of_irqs);
- return 0;
- err4:
- while (--k >= 0)
- free_irq(p->irq[k].requested_irq, &p->irq[k]);
- err3:
- irq_domain_remove(p->irq_domain);
- err2:
- iounmap(p->iomem);
- err1:
- pm_runtime_put(&pdev->dev);
- pm_runtime_disable(&pdev->dev);
- kfree(p);
- err0:
- return ret;
- }
- static int irqc_remove(struct platform_device *pdev)
- {
- struct irqc_priv *p = platform_get_drvdata(pdev);
- int k;
- for (k = 0; k < p->number_of_irqs; k++)
- free_irq(p->irq[k].requested_irq, &p->irq[k]);
- irq_domain_remove(p->irq_domain);
- iounmap(p->iomem);
- pm_runtime_put(&pdev->dev);
- pm_runtime_disable(&pdev->dev);
- kfree(p);
- return 0;
- }
- static const struct of_device_id irqc_dt_ids[] = {
- { .compatible = "renesas,irqc", },
- {},
- };
- MODULE_DEVICE_TABLE(of, irqc_dt_ids);
- static struct platform_driver irqc_device_driver = {
- .probe = irqc_probe,
- .remove = irqc_remove,
- .driver = {
- .name = "renesas_irqc",
- .of_match_table = irqc_dt_ids,
- }
- };
- static int __init irqc_init(void)
- {
- return platform_driver_register(&irqc_device_driver);
- }
- postcore_initcall(irqc_init);
- static void __exit irqc_exit(void)
- {
- platform_driver_unregister(&irqc_device_driver);
- }
- module_exit(irqc_exit);
- MODULE_AUTHOR("Magnus Damm");
- MODULE_DESCRIPTION("Renesas IRQC Driver");
- MODULE_LICENSE("GPL v2");
|