--- /dev/null
+/*
+ * Renesas INTC External IRQ Pin 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/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/platform_data/irq-renesas-intc-irqpin.h>
+
+#define INTC_IRQPIN_MAX 8 /* maximum 8 interrupts per driver instance */
+
+#define INTC_IRQPIN_REG_SENSE 0 /* ICRn */
+#define INTC_IRQPIN_REG_PRIO 1 /* INTPRInn */
+#define INTC_IRQPIN_REG_SOURCE 2 /* INTREQnn */
+#define INTC_IRQPIN_REG_MASK 3 /* INTMSKnn */
+#define INTC_IRQPIN_REG_CLEAR 4 /* INTMSKCLRnn */
+#define INTC_IRQPIN_REG_NR 5
+
+/* INTC external IRQ PIN hardware register access:
+ *
+ * SENSE is read-write 32-bit with 2-bits or 4-bits per IRQ (*)
+ * PRIO is read-write 32-bit with 4-bits per IRQ (**)
+ * SOURCE is read-only 32-bit or 8-bit with 1-bit per IRQ (***)
+ * MASK is write-only 32-bit or 8-bit with 1-bit per IRQ (***)
+ * CLEAR is write-only 32-bit or 8-bit with 1-bit per IRQ (***)
+ *
+ * (*) May be accessed by more than one driver instance - lock needed
+ * (**) Read-modify-write access by one driver instance - lock needed
+ * (***) Accessed by one driver instance only - no locking needed
+ */
+
+struct intc_irqpin_iomem {
+ void __iomem *iomem;
+ unsigned long (*read)(void __iomem *iomem);
+ void (*write)(void __iomem *iomem, unsigned long data);
+ int width;
+};
+
+struct intc_irqpin_irq {
+ int hw_irq;
+ int irq;
+ struct intc_irqpin_priv *p;
+};
+
+struct intc_irqpin_priv {
+ struct intc_irqpin_iomem iomem[INTC_IRQPIN_REG_NR];
+ struct intc_irqpin_irq irq[INTC_IRQPIN_MAX];
+ struct renesas_intc_irqpin_config config;
+ unsigned int number_of_irqs;
+ struct platform_device *pdev;
+ struct irq_chip irq_chip;
+ struct irq_domain *irq_domain;
+};
+
+static unsigned long intc_irqpin_read32(void __iomem *iomem)
+{
+ return ioread32(iomem);
+}
+
+static unsigned long intc_irqpin_read8(void __iomem *iomem)
+{
+ return ioread8(iomem);
+}
+
+static void intc_irqpin_write32(void __iomem *iomem, unsigned long data)
+{
+ iowrite32(data, iomem);
+}
+
+static void intc_irqpin_write8(void __iomem *iomem, unsigned long data)
+{
+ iowrite8(data, iomem);
+}
+
+static inline unsigned long intc_irqpin_read(struct intc_irqpin_priv *p,
+ int reg)
+{
+ struct intc_irqpin_iomem *i = &p->iomem[reg];
+ return i->read(i->iomem);
+}
+
+static inline void intc_irqpin_write(struct intc_irqpin_priv *p,
+ int reg, unsigned long data)
+{
+ struct intc_irqpin_iomem *i = &p->iomem[reg];
+ i->write(i->iomem, data);
+}
+
+static inline unsigned long intc_irqpin_hwirq_mask(struct intc_irqpin_priv *p,
+ int reg, int hw_irq)
+{
+ return BIT((p->iomem[reg].width - 1) - hw_irq);
+}
+
+static inline void intc_irqpin_irq_write_hwirq(struct intc_irqpin_priv *p,
+ int reg, int hw_irq)
+{
+ intc_irqpin_write(p, reg, intc_irqpin_hwirq_mask(p, reg, hw_irq));
+}
+
+static DEFINE_RAW_SPINLOCK(intc_irqpin_lock); /* only used by slow path */
+
+static void intc_irqpin_read_modify_write(struct intc_irqpin_priv *p,
+ int reg, int shift,
+ int width, int value)
+{
+ unsigned long flags;
+ unsigned long tmp;
+
+ raw_spin_lock_irqsave(&intc_irqpin_lock, flags);
+
+ tmp = intc_irqpin_read(p, reg);
+ tmp &= ~(((1 << width) - 1) << shift);
+ tmp |= value << shift;
+ intc_irqpin_write(p, reg, tmp);
+
+ raw_spin_unlock_irqrestore(&intc_irqpin_lock, flags);
+}
+
+static void intc_irqpin_mask_unmask_prio(struct intc_irqpin_priv *p,
+ int irq, int do_mask)
+{
+ int bitfield_width = 4; /* PRIO assumed to have fixed bitfield width */
+ int shift = (7 - irq) * bitfield_width; /* PRIO assumed to be 32-bit */
+
+ intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_PRIO,
+ shift, bitfield_width,
+ do_mask ? 0 : (1 << bitfield_width) - 1);
+}
+
+static int intc_irqpin_set_sense(struct intc_irqpin_priv *p, int irq, int value)
+{
+ int bitfield_width = p->config.sense_bitfield_width;
+ int shift = (7 - irq) * bitfield_width; /* SENSE assumed to be 32-bit */
+
+ dev_dbg(&p->pdev->dev, "sense irq = %d, mode = %d\n", irq, value);
+
+ if (value >= (1 << bitfield_width))
+ return -EINVAL;
+
+ intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_SENSE, shift,
+ bitfield_width, value);
+ return 0;
+}
+
+static void intc_irqpin_dbg(struct intc_irqpin_irq *i, char *str)
+{
+ dev_dbg(&i->p->pdev->dev, "%s (%d:%d:%d)\n",
+ str, i->irq, i->hw_irq,
+ irq_find_mapping(i->p->irq_domain, i->hw_irq));
+}
+
+static void intc_irqpin_irq_enable(struct irq_data *d)
+{
+ struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
+ int hw_irq = irqd_to_hwirq(d);
+
+ intc_irqpin_dbg(&p->irq[hw_irq], "enable");
+ intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_CLEAR, hw_irq);
+}
+
+static void intc_irqpin_irq_disable(struct irq_data *d)
+{
+ struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
+ int hw_irq = irqd_to_hwirq(d);
+
+ intc_irqpin_dbg(&p->irq[hw_irq], "disable");
+ intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_MASK, hw_irq);
+}
+
+static void intc_irqpin_irq_enable_force(struct irq_data *d)
+{
+ struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
+ int irq = p->irq[irqd_to_hwirq(d)].irq;
+
+ intc_irqpin_irq_enable(d);
+ irq_get_chip(irq)->irq_unmask(irq_get_irq_data(irq));
+}
+
+static void intc_irqpin_irq_disable_force(struct irq_data *d)
+{
+ struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
+ int irq = p->irq[irqd_to_hwirq(d)].irq;
+
+ irq_get_chip(irq)->irq_mask(irq_get_irq_data(irq));
+ intc_irqpin_irq_disable(d);
+}
+
+#define INTC_IRQ_SENSE_VALID 0x10
+#define INTC_IRQ_SENSE(x) (x + INTC_IRQ_SENSE_VALID)
+
+static unsigned char intc_irqpin_sense[IRQ_TYPE_SENSE_MASK + 1] = {
+ [IRQ_TYPE_EDGE_FALLING] = INTC_IRQ_SENSE(0x00),
+ [IRQ_TYPE_EDGE_RISING] = INTC_IRQ_SENSE(0x01),
+ [IRQ_TYPE_LEVEL_LOW] = INTC_IRQ_SENSE(0x02),
+ [IRQ_TYPE_LEVEL_HIGH] = INTC_IRQ_SENSE(0x03),
+ [IRQ_TYPE_EDGE_BOTH] = INTC_IRQ_SENSE(0x04),
+};
+
+static int intc_irqpin_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ unsigned char value = intc_irqpin_sense[type & IRQ_TYPE_SENSE_MASK];
+ struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
+
+ if (!(value & INTC_IRQ_SENSE_VALID))
+ return -EINVAL;
+
+ return intc_irqpin_set_sense(p, irqd_to_hwirq(d),
+ value ^ INTC_IRQ_SENSE_VALID);
+}
+
+static irqreturn_t intc_irqpin_irq_handler(int irq, void *dev_id)
+{
+ struct intc_irqpin_irq *i = dev_id;
+ struct intc_irqpin_priv *p = i->p;
+ unsigned long bit;
+
+ intc_irqpin_dbg(i, "demux1");
+ bit = intc_irqpin_hwirq_mask(p, INTC_IRQPIN_REG_SOURCE, i->hw_irq);
+
+ if (intc_irqpin_read(p, INTC_IRQPIN_REG_SOURCE) & bit) {
+ intc_irqpin_write(p, INTC_IRQPIN_REG_SOURCE, ~bit);
+ intc_irqpin_dbg(i, "demux2");
+ generic_handle_irq(irq_find_mapping(p->irq_domain, i->hw_irq));
+ return IRQ_HANDLED;
+ }
+ return IRQ_NONE;
+}
+
+static int intc_irqpin_irq_domain_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ struct intc_irqpin_priv *p = h->host_data;
+
+ intc_irqpin_dbg(&p->irq[hw], "map");
+ irq_set_chip_data(virq, h->host_data);
+ irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
+ set_irq_flags(virq, IRQF_VALID); /* kill me now */
+ return 0;
+}
+
+static struct irq_domain_ops intc_irqpin_irq_domain_ops = {
+ .map = intc_irqpin_irq_domain_map,
+};
+
+static int intc_irqpin_probe(struct platform_device *pdev)
+{
+ struct renesas_intc_irqpin_config *pdata = pdev->dev.platform_data;
+ struct intc_irqpin_priv *p;
+ struct intc_irqpin_iomem *i;
+ struct resource *io[INTC_IRQPIN_REG_NR];
+ struct resource *irq;
+ struct irq_chip *irq_chip;
+ void (*enable_fn)(struct irq_data *d);
+ void (*disable_fn)(struct irq_data *d);
+ 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;
+ }
+
+ /* deal with driver instance configuration */
+ if (pdata)
+ memcpy(&p->config, pdata, sizeof(*pdata));
+ if (!p->config.sense_bitfield_width)
+ p->config.sense_bitfield_width = 4; /* default to 4 bits */
+
+ p->pdev = pdev;
+ platform_set_drvdata(pdev, p);
+
+ /* get hold of manadatory IOMEM */
+ for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
+ io[k] = platform_get_resource(pdev, IORESOURCE_MEM, k);
+ if (!io[k]) {
+ dev_err(&pdev->dev, "not enough IOMEM resources\n");
+ ret = -EINVAL;
+ goto err1;
+ }
+ }
+
+ /* allow any number of IRQs between 1 and INTC_IRQPIN_MAX */
+ for (k = 0; k < INTC_IRQPIN_MAX; k++) {
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, k);
+ if (!irq)
+ break;
+
+ p->irq[k].hw_irq = k;
+ p->irq[k].p = p;
+ p->irq[k].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 */
+ for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
+ i = &p->iomem[k];
+
+ switch (resource_size(io[k])) {
+ case 1:
+ i->width = 8;
+ i->read = intc_irqpin_read8;
+ i->write = intc_irqpin_write8;
+ break;
+ case 4:
+ i->width = 32;
+ i->read = intc_irqpin_read32;
+ i->write = intc_irqpin_write32;
+ break;
+ default:
+ dev_err(&pdev->dev, "IOMEM size mismatch\n");
+ ret = -EINVAL;
+ goto err2;
+ }
+
+ i->iomem = ioremap_nocache(io[k]->start, resource_size(io[k]));
+ if (!i->iomem) {
+ dev_err(&pdev->dev, "failed to remap IOMEM\n");
+ ret = -ENXIO;
+ goto err2;
+ }
+ }
+
+ /* mask all interrupts using priority */
+ for (k = 0; k < p->number_of_irqs; k++)
+ intc_irqpin_mask_unmask_prio(p, k, 1);
+
+ /* use more severe masking method if requested */
+ if (p->config.control_parent) {
+ enable_fn = intc_irqpin_irq_enable_force;
+ disable_fn = intc_irqpin_irq_disable_force;
+ } else {
+ enable_fn = intc_irqpin_irq_enable;
+ disable_fn = intc_irqpin_irq_disable;
+ }
+
+ irq_chip = &p->irq_chip;
+ irq_chip->name = name;
+ irq_chip->irq_mask = disable_fn;
+ irq_chip->irq_unmask = enable_fn;
+ irq_chip->irq_enable = enable_fn;
+ irq_chip->irq_disable = disable_fn;
+ irq_chip->irq_set_type = intc_irqpin_irq_set_type;
+ irq_chip->flags = IRQCHIP_SKIP_SET_WAKE;
+
+ p->irq_domain = irq_domain_add_simple(pdev->dev.of_node,
+ p->number_of_irqs,
+ p->config.irq_base,
+ &intc_irqpin_irq_domain_ops, p);
+ if (!p->irq_domain) {
+ ret = -ENXIO;
+ dev_err(&pdev->dev, "cannot initialize irq domain\n");
+ goto err2;
+ }
+
+ /* request and set priority on interrupts one by one */
+ for (k = 0; k < p->number_of_irqs; k++) {
+ if (request_irq(p->irq[k].irq, intc_irqpin_irq_handler,
+ 0, name, &p->irq[k])) {
+ dev_err(&pdev->dev, "failed to request low IRQ\n");
+ ret = -ENOENT;
+ goto err3;
+ }
+ intc_irqpin_mask_unmask_prio(p, k, 0);
+ }
+
+ dev_info(&pdev->dev, "driving %d irqs\n", p->number_of_irqs);
+
+ /* warn in case of mismatch if irq base is specified */
+ if (p->config.irq_base) {
+ k = irq_find_mapping(p->irq_domain, 0);
+ if (p->config.irq_base != k)
+ dev_warn(&pdev->dev, "irq base mismatch (%d/%d)\n",
+ p->config.irq_base, k);
+ }
+
+ return 0;
+
+err3:
+ for (; k >= 0; k--)
+ free_irq(p->irq[k - 1].irq, &p->irq[k - 1]);
+
+ irq_domain_remove(p->irq_domain);
+err2:
+ for (k = 0; k < INTC_IRQPIN_REG_NR; k++)
+ iounmap(p->iomem[k].iomem);
+err1:
+ kfree(p);
+err0:
+ return ret;
+}
+
+static int intc_irqpin_remove(struct platform_device *pdev)
+{
+ struct intc_irqpin_priv *p = platform_get_drvdata(pdev);
+ int k;
+
+ for (k = 0; k < p->number_of_irqs; k++)
+ free_irq(p->irq[k].irq, &p->irq[k]);
+
+ irq_domain_remove(p->irq_domain);
+
+ for (k = 0; k < INTC_IRQPIN_REG_NR; k++)
+ iounmap(p->iomem[k].iomem);
+
+ kfree(p);
+ return 0;
+}
+
+static struct platform_driver intc_irqpin_device_driver = {
+ .probe = intc_irqpin_probe,
+ .remove = intc_irqpin_remove,
+ .driver = {
+ .name = "renesas_intc_irqpin",
+ }
+};
+
+static int __init intc_irqpin_init(void)
+{
+ return platform_driver_register(&intc_irqpin_device_driver);
+}
+postcore_initcall(intc_irqpin_init);
+
+static void __exit intc_irqpin_exit(void)
+{
+ platform_driver_unregister(&intc_irqpin_device_driver);
+}
+module_exit(intc_irqpin_exit);
+
+MODULE_AUTHOR("Magnus Damm");
+MODULE_DESCRIPTION("Renesas INTC External IRQ Pin Driver");
+MODULE_LICENSE("GPL v2");
projects / firefly-linux-kernel-4.4.55.git / commitdiff