1 files changed, 290 insertions, 0 deletions
diff --git a/drivers/irqchip/spear-shirq.c b/drivers/irqchip/spear-shirq.c
new file mode 100644
index 000000000..7c17a6f64
--- /dev/null
+++ b/drivers/irqchip/spear-shirq.c
@@ -0,0 +1,290 @@
+/*
+ * SPEAr platform shared irq layer source file
+ *
+ * Copyright (C) 2009-2012 ST Microelectronics
+ * Viresh Kumar <vireshk@kernel.org>
+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Shiraz Hashim <shiraz.linux.kernel@gmail.com>
+ *
+ * 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.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/spinlock.h>
+
+/*
+ * struct spear_shirq: shared irq structure
+ *
+ * base:	Base register address
+ * status_reg:	Status register offset for chained interrupt handler
+ * mask_reg:	Mask register offset for irq chip
+ * mask:	Mask to apply to the status register
+ * virq_base:	Base virtual interrupt number
+ * nr_irqs:	Number of interrupts handled by this block
+ * offset:	Bit offset of the first interrupt
+ * irq_chip:	Interrupt controller chip used for this instance,
+ *		if NULL group is disabled, but accounted
+ */
+struct spear_shirq {
+	void __iomem		*base;
+	u32			status_reg;
+	u32			mask_reg;
+	u32			mask;
+	u32			virq_base;
+	u32			nr_irqs;
+	u32			offset;
+	struct irq_chip		*irq_chip;
+};
+
+/* spear300 shared irq registers offsets and masks */
+#define SPEAR300_INT_ENB_MASK_REG	0x54
+#define SPEAR300_INT_STS_MASK_REG	0x58
+
+static DEFINE_RAW_SPINLOCK(shirq_lock);
+
+static void shirq_irq_mask(struct irq_data *d)
+{
+	struct spear_shirq *shirq = irq_data_get_irq_chip_data(d);
+	u32 val, shift = d->irq - shirq->virq_base + shirq->offset;
+	u32 __iomem *reg = shirq->base + shirq->mask_reg;
+
+	raw_spin_lock(&shirq_lock);
+	val = readl(reg) & ~(0x1 << shift);
+	writel(val, reg);
+	raw_spin_unlock(&shirq_lock);
+}
+
+static void shirq_irq_unmask(struct irq_data *d)
+{
+	struct spear_shirq *shirq = irq_data_get_irq_chip_data(d);
+	u32 val, shift = d->irq - shirq->virq_base + shirq->offset;
+	u32 __iomem *reg = shirq->base + shirq->mask_reg;
+
+	raw_spin_lock(&shirq_lock);
+	val = readl(reg) | (0x1 << shift);
+	writel(val, reg);
+	raw_spin_unlock(&shirq_lock);
+}
+
+static struct irq_chip shirq_chip = {
+	.name		= "spear-shirq",
+	.irq_mask	= shirq_irq_mask,
+	.irq_unmask	= shirq_irq_unmask,
+};
+
+static struct spear_shirq spear300_shirq_ras1 = {
+	.offset		= 0,
+	.nr_irqs	= 9,
+	.mask		= ((0x1 << 9) - 1) << 0,
+	.irq_chip	= &shirq_chip,
+	.status_reg	= SPEAR300_INT_STS_MASK_REG,
+	.mask_reg	= SPEAR300_INT_ENB_MASK_REG,
+};
+
+static struct spear_shirq *spear300_shirq_blocks[] = {
+	&spear300_shirq_ras1,
+};
+
+/* spear310 shared irq registers offsets and masks */
+#define SPEAR310_INT_STS_MASK_REG	0x04
+
+static struct spear_shirq spear310_shirq_ras1 = {
+	.offset		= 0,
+	.nr_irqs	= 8,
+	.mask		= ((0x1 << 8) - 1) << 0,
+	.irq_chip	= &dummy_irq_chip,
+	.status_reg	= SPEAR310_INT_STS_MASK_REG,
+};
+
+static struct spear_shirq spear310_shirq_ras2 = {
+	.offset		= 8,
+	.nr_irqs	= 5,
+	.mask		= ((0x1 << 5) - 1) << 8,
+	.irq_chip	= &dummy_irq_chip,
+	.status_reg	= SPEAR310_INT_STS_MASK_REG,
+};
+
+static struct spear_shirq spear310_shirq_ras3 = {
+	.offset		= 13,
+	.nr_irqs	= 1,
+	.mask		= ((0x1 << 1) - 1) << 13,
+	.irq_chip	= &dummy_irq_chip,
+	.status_reg	= SPEAR310_INT_STS_MASK_REG,
+};
+
+static struct spear_shirq spear310_shirq_intrcomm_ras = {
+	.offset		= 14,
+	.nr_irqs	= 3,
+	.mask		= ((0x1 << 3) - 1) << 14,
+	.irq_chip	= &dummy_irq_chip,
+	.status_reg	= SPEAR310_INT_STS_MASK_REG,
+};
+
+static struct spear_shirq *spear310_shirq_blocks[] = {
+	&spear310_shirq_ras1,
+	&spear310_shirq_ras2,
+	&spear310_shirq_ras3,
+	&spear310_shirq_intrcomm_ras,
+};
+
+/* spear320 shared irq registers offsets and masks */
+#define SPEAR320_INT_STS_MASK_REG		0x04
+#define SPEAR320_INT_CLR_MASK_REG		0x04
+#define SPEAR320_INT_ENB_MASK_REG		0x08
+
+static struct spear_shirq spear320_shirq_ras3 = {
+	.offset		= 0,
+	.nr_irqs	= 7,
+	.mask		= ((0x1 << 7) - 1) << 0,
+	.irq_chip	= &dummy_irq_chip,
+	.status_reg	= SPEAR320_INT_STS_MASK_REG,
+};
+
+static struct spear_shirq spear320_shirq_ras1 = {
+	.offset		= 7,
+	.nr_irqs	= 3,
+	.mask		= ((0x1 << 3) - 1) << 7,
+	.irq_chip	= &dummy_irq_chip,
+	.status_reg	= SPEAR320_INT_STS_MASK_REG,
+};
+
+static struct spear_shirq spear320_shirq_ras2 = {
+	.offset		= 10,
+	.nr_irqs	= 1,
+	.mask		= ((0x1 << 1) - 1) << 10,
+	.irq_chip	= &dummy_irq_chip,
+	.status_reg	= SPEAR320_INT_STS_MASK_REG,
+};
+
+static struct spear_shirq spear320_shirq_intrcomm_ras = {
+	.offset		= 11,
+	.nr_irqs	= 11,
+	.mask		= ((0x1 << 11) - 1) << 11,
+	.irq_chip	= &dummy_irq_chip,
+	.status_reg	= SPEAR320_INT_STS_MASK_REG,
+};
+
+static struct spear_shirq *spear320_shirq_blocks[] = {
+	&spear320_shirq_ras3,
+	&spear320_shirq_ras1,
+	&spear320_shirq_ras2,
+	&spear320_shirq_intrcomm_ras,
+};
+
+static void shirq_handler(struct irq_desc *desc)
+{
+	struct spear_shirq *shirq = irq_desc_get_handler_data(desc);
+	u32 pend;
+
+	pend = readl(shirq->base + shirq->status_reg) & shirq->mask;
+	pend >>= shirq->offset;
+
+	while (pend) {
+		int irq = __ffs(pend);
+
+		pend &= ~(0x1 << irq);
+		generic_handle_irq(shirq->virq_base + irq);
+	}
+}
+
+static void __init spear_shirq_register(struct spear_shirq *shirq,
+					int parent_irq)
+{
+	int i;
+
+	if (!shirq->irq_chip)
+		return;
+
+	irq_set_chained_handler_and_data(parent_irq, shirq_handler, shirq);
+
+	for (i = 0; i < shirq->nr_irqs; i++) {
+		irq_set_chip_and_handler(shirq->virq_base + i,
+					 shirq->irq_chip, handle_simple_irq);
+		irq_set_chip_data(shirq->virq_base + i, shirq);
+	}
+}
+
+static int __init shirq_init(struct spear_shirq **shirq_blocks, int block_nr,
+		struct device_node *np)
+{
+	int i, parent_irq, virq_base, hwirq = 0, nr_irqs = 0;
+	struct irq_domain *shirq_domain;
+	void __iomem *base;
+
+	base = of_iomap(np, 0);
+	if (!base) {
+		pr_err("%s: failed to map shirq registers\n", __func__);
+		return -ENXIO;
+	}
+
+	for (i = 0; i < block_nr; i++)
+		nr_irqs += shirq_blocks[i]->nr_irqs;
+
+	virq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
+	if (virq_base < 0) {
+		pr_err("%s: irq desc alloc failed\n", __func__);
+		goto err_unmap;
+	}
+
+	shirq_domain = irq_domain_add_legacy(np, nr_irqs, virq_base, 0,
+			&irq_domain_simple_ops, NULL);
+	if (WARN_ON(!shirq_domain)) {
+		pr_warn("%s: irq domain init failed\n", __func__);
+		goto err_free_desc;
+	}
+
+	for (i = 0; i < block_nr; i++) {
+		shirq_blocks[i]->base = base;
+		shirq_blocks[i]->virq_base = irq_find_mapping(shirq_domain,
+				hwirq);
+
+		parent_irq = irq_of_parse_and_map(np, i);
+		spear_shirq_register(shirq_blocks[i], parent_irq);
+		hwirq += shirq_blocks[i]->nr_irqs;
+	}
+
+	return 0;
+
+err_free_desc:
+	irq_free_descs(virq_base, nr_irqs);
+err_unmap:
+	iounmap(base);
+	return -ENXIO;
+}
+
+static int __init spear300_shirq_of_init(struct device_node *np,
+					 struct device_node *parent)
+{
+	return shirq_init(spear300_shirq_blocks,
+			ARRAY_SIZE(spear300_shirq_blocks), np);
+}
+IRQCHIP_DECLARE(spear300_shirq, "st,spear300-shirq", spear300_shirq_of_init);
+
+static int __init spear310_shirq_of_init(struct device_node *np,
+					 struct device_node *parent)
+{
+	return shirq_init(spear310_shirq_blocks,
+			ARRAY_SIZE(spear310_shirq_blocks), np);
+}
+IRQCHIP_DECLARE(spear310_shirq, "st,spear310-shirq", spear310_shirq_of_init);
+
+static int __init spear320_shirq_of_init(struct device_node *np,
+					 struct device_node *parent)
+{
+	return shirq_init(spear320_shirq_blocks,
+			ARRAY_SIZE(spear320_shirq_blocks), np);
+}
+IRQCHIP_DECLARE(spear320_shirq, "st,spear320-shirq", spear320_shirq_of_init);