1 files changed, 316 insertions, 0 deletions
diff --git a/drivers/irqchip/spear-shirq.c b/drivers/irqchip/spear-shirq.c
new file mode 100644
index 000000000000..80e1d2fd9d4c
--- /dev/null
+++ b/drivers/irqchip/spear-shirq.c
@@ -0,0 +1,316 @@
+/*
+ * SPEAr platform shared irq layer source file
+ *
+ * Copyright (C) 2009-2012 ST Microelectronics
+ * Viresh Kumar <viresh.linux@gmail.com>
+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Shiraz Hashim <shiraz.hashim@st.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/irqdomain.h>
+#include <linux/irqchip/spear-shirq.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/spinlock.h>
+
+static DEFINE_SPINLOCK(lock);
+
+/* spear300 shared irq registers offsets and masks */
+#define SPEAR300_INT_ENB_MASK_REG	0x54
+#define SPEAR300_INT_STS_MASK_REG	0x58
+
+static struct spear_shirq spear300_shirq_ras1 = {
+	.irq_nr = 9,
+	.irq_bit_off = 0,
+	.regs = {
+		.enb_reg = SPEAR300_INT_ENB_MASK_REG,
+		.status_reg = SPEAR300_INT_STS_MASK_REG,
+		.clear_reg = -1,
+	},
+};
+
+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 = {
+	.irq_nr = 8,
+	.irq_bit_off = 0,
+	.regs = {
+		.enb_reg = -1,
+		.status_reg = SPEAR310_INT_STS_MASK_REG,
+		.clear_reg = -1,
+	},
+};
+
+static struct spear_shirq spear310_shirq_ras2 = {
+	.irq_nr = 5,
+	.irq_bit_off = 8,
+	.regs = {
+		.enb_reg = -1,
+		.status_reg = SPEAR310_INT_STS_MASK_REG,
+		.clear_reg = -1,
+	},
+};
+
+static struct spear_shirq spear310_shirq_ras3 = {
+	.irq_nr = 1,
+	.irq_bit_off = 13,
+	.regs = {
+		.enb_reg = -1,
+		.status_reg = SPEAR310_INT_STS_MASK_REG,
+		.clear_reg = -1,
+	},
+};
+
+static struct spear_shirq spear310_shirq_intrcomm_ras = {
+	.irq_nr = 3,
+	.irq_bit_off = 14,
+	.regs = {
+		.enb_reg = -1,
+		.status_reg = SPEAR310_INT_STS_MASK_REG,
+		.clear_reg = -1,
+	},
+};
+
+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_ras1 = {
+	.irq_nr = 3,
+	.irq_bit_off = 7,
+	.regs = {
+		.enb_reg = -1,
+		.status_reg = SPEAR320_INT_STS_MASK_REG,
+		.clear_reg = SPEAR320_INT_CLR_MASK_REG,
+		.reset_to_clear = 1,
+	},
+};
+
+static struct spear_shirq spear320_shirq_ras2 = {
+	.irq_nr = 1,
+	.irq_bit_off = 10,
+	.regs = {
+		.enb_reg = -1,
+		.status_reg = SPEAR320_INT_STS_MASK_REG,
+		.clear_reg = SPEAR320_INT_CLR_MASK_REG,
+		.reset_to_clear = 1,
+	},
+};
+
+static struct spear_shirq spear320_shirq_ras3 = {
+	.irq_nr = 3,
+	.irq_bit_off = 0,
+	.invalid_irq = 1,
+	.regs = {
+		.enb_reg = SPEAR320_INT_ENB_MASK_REG,
+		.reset_to_enb = 1,
+		.status_reg = SPEAR320_INT_STS_MASK_REG,
+		.clear_reg = SPEAR320_INT_CLR_MASK_REG,
+		.reset_to_clear = 1,
+	},
+};
+
+static struct spear_shirq spear320_shirq_intrcomm_ras = {
+	.irq_nr = 11,
+	.irq_bit_off = 11,
+	.regs = {
+		.enb_reg = -1,
+		.status_reg = SPEAR320_INT_STS_MASK_REG,
+		.clear_reg = SPEAR320_INT_CLR_MASK_REG,
+		.reset_to_clear = 1,
+	},
+};
+
+static struct spear_shirq *spear320_shirq_blocks[] = {
+	&spear320_shirq_ras3,
+	&spear320_shirq_ras1,
+	&spear320_shirq_ras2,
+	&spear320_shirq_intrcomm_ras,
+};
+
+static void shirq_irq_mask_unmask(struct irq_data *d, bool mask)
+{
+	struct spear_shirq *shirq = irq_data_get_irq_chip_data(d);
+	u32 val, offset = d->irq - shirq->irq_base;
+	unsigned long flags;
+
+	if (shirq->regs.enb_reg == -1)
+		return;
+
+	spin_lock_irqsave(&lock, flags);
+	val = readl(shirq->base + shirq->regs.enb_reg);
+
+	if (mask ^ shirq->regs.reset_to_enb)
+		val &= ~(0x1 << shirq->irq_bit_off << offset);
+	else
+		val |= 0x1 << shirq->irq_bit_off << offset;
+
+	writel(val, shirq->base + shirq->regs.enb_reg);
+	spin_unlock_irqrestore(&lock, flags);
+
+}
+
+static void shirq_irq_mask(struct irq_data *d)
+{
+	shirq_irq_mask_unmask(d, 1);
+}
+
+static void shirq_irq_unmask(struct irq_data *d)
+{
+	shirq_irq_mask_unmask(d, 0);
+}
+
+static struct irq_chip shirq_chip = {
+	.name		= "spear-shirq",
+	.irq_ack	= shirq_irq_mask,
+	.irq_mask	= shirq_irq_mask,
+	.irq_unmask	= shirq_irq_unmask,
+};
+
+static void shirq_handler(unsigned irq, struct irq_desc *desc)
+{
+	u32 i, j, val, mask, tmp;
+	struct irq_chip *chip;
+	struct spear_shirq *shirq = irq_get_handler_data(irq);
+
+	chip = irq_get_chip(irq);
+	chip->irq_ack(&desc->irq_data);
+
+	mask = ((0x1 << shirq->irq_nr) - 1) << shirq->irq_bit_off;
+	while ((val = readl(shirq->base + shirq->regs.status_reg) &
+				mask)) {
+
+		val >>= shirq->irq_bit_off;
+		for (i = 0, j = 1; i < shirq->irq_nr; i++, j <<= 1) {
+
+			if (!(j & val))
+				continue;
+
+			generic_handle_irq(shirq->irq_base + i);
+
+			/* clear interrupt */
+			if (shirq->regs.clear_reg == -1)
+				continue;
+
+			tmp = readl(shirq->base + shirq->regs.clear_reg);
+			if (shirq->regs.reset_to_clear)
+				tmp &= ~(j << shirq->irq_bit_off);
+			else
+				tmp |= (j << shirq->irq_bit_off);
+			writel(tmp, shirq->base + shirq->regs.clear_reg);
+		}
+	}
+	chip->irq_unmask(&desc->irq_data);
+}
+
+static void __init spear_shirq_register(struct spear_shirq *shirq)
+{
+	int i;
+
+	if (shirq->invalid_irq)
+		return;
+
+	irq_set_chained_handler(shirq->irq, shirq_handler);
+	for (i = 0; i < shirq->irq_nr; i++) {
+		irq_set_chip_and_handler(shirq->irq_base + i,
+					 &shirq_chip, handle_simple_irq);
+		set_irq_flags(shirq->irq_base + i, IRQF_VALID);
+		irq_set_chip_data(shirq->irq_base + i, shirq);
+	}
+
+	irq_set_handler_data(shirq->irq, shirq);
+}
+
+static int __init shirq_init(struct spear_shirq **shirq_blocks, int block_nr,
+		struct device_node *np)
+{
+	int i, irq_base, hwirq = 0, irq_nr = 0;
+	static 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++)
+		irq_nr += shirq_blocks[i]->irq_nr;
+
+	irq_base = irq_alloc_descs(-1, 0, irq_nr, 0);
+	if (IS_ERR_VALUE(irq_base)) {
+		pr_err("%s: irq desc alloc failed\n", __func__);
+		goto err_unmap;
+	}
+
+	shirq_domain = irq_domain_add_legacy(np, irq_nr, irq_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]->irq_base = irq_find_mapping(shirq_domain,
+				hwirq);
+		shirq_blocks[i]->irq = irq_of_parse_and_map(np, i);
+
+		spear_shirq_register(shirq_blocks[i]);
+		hwirq += shirq_blocks[i]->irq_nr;
+	}
+
+	return 0;
+
+err_free_desc:
+	irq_free_descs(irq_base, irq_nr);
+err_unmap:
+	iounmap(base);
+	return -ENXIO;
+}
+
+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);
+}
+
+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);
+}
+
+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);
+}