[PATCH v2 2/2] ARM: irqchip: mxs: add Alpascale ASM9260 support

From: Oleksij Rempel
Date: Fri Sep 18 2015 - 05:48:59 EST

From: Oleksij Rempel <external.Oleksij.Rempel@xxxxxxxxxxxx>

Freescale iMX23/iMX28 and Alphascale ASM9260 have similar
interrupt collectors. It makes easy to reuse irq-mxs code for ASM9260.
Differences between this devices are fallowing:
- different register offsets
- different count of intterupt lines per register
- ASM9260 don't provide reset bit
- ASM9260 don't support FIQ.

Signed-off-by: Oleksij Rempel <external.Oleksij.Rempel@xxxxxxxxxxxx>
---
drivers/irqchip/Kconfig | 5 ++
drivers/irqchip/Makefile | 2 +-
drivers/irqchip/alphascale_asm9260-icoll.h | 109 +++++++++++++++++++++++++++++
drivers/irqchip/irq-mxs.c | 106 +++++++++++++++++++++++++++-
4 files changed, 220 insertions(+), 2 deletions(-)
create mode 100644 drivers/irqchip/alphascale_asm9260-icoll.h

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 27b52c8..0dfd840 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -187,3 +187,8 @@ config IMX_GPCV2
select IRQ_DOMAIN
help
Enables the wakeup IRQs for IMX platforms with GPCv2 block
+
+config IRQ_MXS
+ def_bool y if MACH_ASM9260 || ARCH_MXS
+ select IRQ_DOMAIN
+ select STMP_DEVICE
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index bb3048f..177f78f 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -6,7 +6,7 @@ obj-$(CONFIG_ARCH_EXYNOS) += exynos-combiner.o
obj-$(CONFIG_ARCH_HIP04) += irq-hip04.o
obj-$(CONFIG_ARCH_MMP) += irq-mmp.o
obj-$(CONFIG_ARCH_MVEBU) += irq-armada-370-xp.o
-obj-$(CONFIG_ARCH_MXS) += irq-mxs.o
+obj-$(CONFIG_IRQ_MXS) += irq-mxs.o
obj-$(CONFIG_ARCH_TEGRA) += irq-tegra.o
obj-$(CONFIG_ARCH_S3C24XX) += irq-s3c24xx.o
obj-$(CONFIG_DW_APB_ICTL) += irq-dw-apb-ictl.o
diff --git a/drivers/irqchip/alphascale_asm9260-icoll.h b/drivers/irqchip/alphascale_asm9260-icoll.h
new file mode 100644
index 0000000..5cec108
--- /dev/null
+++ b/drivers/irqchip/alphascale_asm9260-icoll.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2014 Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
+ *
+ * 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, or
+ * (at your option) any later version.
+ */
+
+#ifndef _ALPHASCALE_ASM9260_ICOLL_H
+#define _ALPHASCALE_ASM9260_ICOLL_H
+
+#define ASM9260_NUM_IRQS 64
+/*
+ * this device provide 4 offsets for each register:
+ * 0x0 - plain read write mode
+ * 0x4 - set mode, OR logic.
+ * 0x8 - clr mode, XOR logic.
+ * 0xc - togle mode.
+ */
+
+#define ASM9260_HW_ICOLL_VECTOR 0x0000
+/*
+ * bits 31:2
+ * This register presents the vector address for the interrupt currently
+ * active on the CPU IRQ input. Writing to this register notifies the
+ * interrupt collector that the interrupt service routine for the current
+ * interrupt has been entered.
+ * The exception trap should have a LDPC instruction from this address:
+ * LDPC ASM9260_HW_ICOLL_VECTOR_ADDR; IRQ exception at 0xffff0018
+ */
+
+/*
+ * The Interrupt Collector Level Acknowledge Register is used by software to
+ * indicate the completion of an interrupt on a specific level.
+ * This register is written at the very end of an interrupt service routine. If
+ * nesting is used then the CPU irq must be turned on before writing to this
+ * register to avoid a race condition in the CPU interrupt hardware.
+ */
+#define ASM9260_HW_ICOLL_LEVELACK 0x0010
+#define ASM9260_BM_LEVELn(nr) BIT(nr)
+
+#define ASM9260_HW_ICOLL_CTRL 0x0020
+/*
+ * ASM9260_BM_CTRL_SFTRST and ASM9260_BM_CTRL_CLKGATE are not available on
+ * asm9260.
+ */
+#define ASM9260_BM_CTRL_SFTRST BIT(31)
+#define ASM9260_BM_CTRL_CLKGATE BIT(30)
+/* disable interrupt level nesting */
+#define ASM9260_BM_CTRL_NO_NESTING BIT(19)
+/*
+ * Set this bit to one enable the RISC32-style read side effect associated with
+ * the vector address register. In this mode, interrupt in-service is signaled
+ * by the read of the ASM9260_HW_ICOLL_VECTOR register to acquire the interrupt
+ * vector address. Set this bit to zero for normal operation, in which the ISR
+ * signals in-service explicitly by means of a write to the
+ * ASM9260_HW_ICOLL_VECTOR register.
+ * 0 - Must Write to Vector register to go in-service.
+ * 1 - Go in-service as a read side effect
+ */
+#define ASM9260_BM_CTRL_ARM_RSE_MODE BIT(18)
+#define ASM9260_BM_CTRL_IRQ_ENABLE BIT(16)
+
+#define ASM9260_HW_ICOLL_STAT_OFFSET 0x0030
+/*
+ * bits 5:0
+ * Vector number of current interrupt. Multiply by 4 and add to vector base
+ * address to obtain the value in ASM9260_HW_ICOLL_VECTOR.
+ */
+
+/*
+ * RAW0 and RAW1 provides a read-only view of the raw interrupt request lines
+ * coming from various parts of the chip. Its purpose is to improve diagnostic
+ * observability.
+ */
+#define ASM9260_HW_ICOLL_RAW0 0x0040
+#define ASM9260_HW_ICOLL_RAW1 0x0050
+
+#define ASM9260_HW_ICOLL_INTERRUPT0 0x0060
+#define ASM9260_HW_ICOLL_INTERRUPTn(n) (0x0060 + ((n) >> 2) * 0x10)
+/*
+ * WARNING: Modifying the priority of an enabled interrupt may result in
+ * undefined behavior.
+ */
+#define ASM9260_BM_INT_PRIORITY_MASK 0x3
+#define ASM9260_BM_INT_ENABLE BIT(2)
+#define ASM9260_BM_INT_SOFTIRQ BIT(3)
+
+#define ASM9260_BM_ICOLL_INTERRUPTn_SHIFT(n) (((n) & 0x3) << 3)
+#define ASM9260_BM_ICOLL_INTERRUPTn_ENABLE(n) (1 << (2 + \
+ ASM9260_BM_ICOLL_INTERRUPTn_SHIFT(n)))
+
+#define ASM9260_HW_ICOLL_VBASE 0x0160
+/*
+ * bits 31:2
+ * This bitfield holds the upper 30 bits of the base address of the vector
+ * table.
+ */
+
+#define ASM9260_HW_ICOLL_CLEAR0 0x01d0
+#define ASM9260_HW_ICOLL_CLEAR1 0x01e0
+#define ASM9260_HW_ICOLL_CLEARn(n) (((n >> 5) * 0x10) \
+ + SET_REG)
+#define ASM9260_BM_CLEAR_BIT(n) BIT(n & 0x1f)
+
+/* Scratchpad */
+#define ASM9260_HW_ICOLL_UNDEF_VECTOR 0x01f0
+#endif
diff --git a/drivers/irqchip/irq-mxs.c b/drivers/irqchip/irq-mxs.c
index 14374de..1470087 100644
--- a/drivers/irqchip/irq-mxs.c
+++ b/drivers/irqchip/irq-mxs.c
@@ -1,5 +1,7 @@
/*
* Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2014 Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
+ * Add Alphascale ASM9260 support.
*
* 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
@@ -28,6 +30,8 @@
#include <linux/stmp_device.h>
#include <asm/exception.h>

+#include "alphascale_asm9260-icoll.h"
+
/*
* this device provide 4 offsets for each register:
* 0x0 - plain read write mode
@@ -49,6 +53,11 @@

#define ICOLL_NUM_IRQS 128

+enum icoll_type {
+ ICOLL,
+ ASM9260_ICOLL,
+};
+
struct icoll_priv {
void __iomem *vector;
void __iomem *levelack;
@@ -58,10 +67,38 @@ struct icoll_priv {
/* number of interrupts per register */
int intr_per_reg;
void __iomem *clear;
+ enum icoll_type type;
};

static struct icoll_priv icoll_priv;
static struct irq_domain *icoll_domain;
+static DEFINE_RAW_SPINLOCK(icoll_lock);
+
+/* calculate bit offset depending on number of intterupt per register */
+static u32 icoll_intr_bitshift(struct irq_data *d, u32 bit)
+{
+ /*
+ * We expect intr_per_reg to be 4 or 1, it means
+ * "n" will be 3 or 0.
+ */
+ int n = icoll_priv.intr_per_reg - 1;
+
+ /*
+ * If n = 0, "bit" is never shifted.
+ * If n = 3, mask lower part of hwirq to convert it
+ * in 0, 1, 2 or 3 and then multiply it by 8 (or shift by 3)
+ */
+ return bit << ((d->hwirq & n) << n);
+}
+
+/* calculate mem offset depending on number of intterupt per register */
+static void __iomem *icoll_intr_reg(struct irq_data *d)
+{
+ int n = icoll_priv.intr_per_reg >> 1;
+
+ /* offset = hwirq / intr_per_reg * 0x10 */
+ return icoll_priv.intr + ((d->hwirq >> n) * 0x10);
+}

static void icoll_ack_irq(struct irq_data *d)
{
@@ -86,12 +123,38 @@ static void icoll_unmask_irq(struct irq_data *d)
icoll_priv.intr + SET_REG + HW_ICOLL_INTERRUPTn(d->hwirq));
}

+static void asm9260_mask_irq(struct irq_data *d)
+{
+ raw_spin_lock(&icoll_lock);
+ __raw_writel(icoll_intr_bitshift(d, BM_ICOLL_INTR_ENABLE),
+ icoll_intr_reg(d) + CLR_REG);
+ raw_spin_unlock(&icoll_lock);
+}
+
+static void asm9260_unmask_irq(struct irq_data *d)
+{
+ raw_spin_lock(&icoll_lock);
+ __raw_writel(ASM9260_BM_CLEAR_BIT(d->hwirq),
+ icoll_priv.clear +
+ ASM9260_HW_ICOLL_CLEARn(d->hwirq));
+
+ __raw_writel(icoll_intr_bitshift(d, BM_ICOLL_INTR_ENABLE),
+ icoll_intr_reg(d) + SET_REG);
+ raw_spin_unlock(&icoll_lock);
+}
+
static struct irq_chip mxs_icoll_chip = {
.irq_ack = icoll_ack_irq,
.irq_mask = icoll_mask_irq,
.irq_unmask = icoll_unmask_irq,
};

+static struct irq_chip asm9260_icoll_chip = {
+ .irq_ack = icoll_ack_irq,
+ .irq_mask = asm9260_mask_irq,
+ .irq_unmask = asm9260_unmask_irq,
+};
+
asmlinkage void __exception_irq_entry icoll_handle_irq(struct pt_regs *regs)
{
u32 irqnr;
@@ -104,7 +167,14 @@ asmlinkage void __exception_irq_entry icoll_handle_irq(struct pt_regs *regs)
static int icoll_irq_domain_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw)
{
- irq_set_chip_and_handler(virq, &mxs_icoll_chip, handle_level_irq);
+ struct irq_chip *chip;
+
+ if (icoll_priv.type == ICOLL)
+ chip = &mxs_icoll_chip;
+ else
+ chip = &asm9260_icoll_chip;
+
+ irq_set_chip_and_handler(virq, chip, handle_level_irq);
set_irq_flags(virq, IRQF_VALID);

return 0;
@@ -142,6 +212,8 @@ static int __init icoll_of_init(struct device_node *np,
{
void __iomem *icoll_base;

+ icoll_priv.type = ICOLL;
+
icoll_base = icoll_init_iobase(np);
icoll_priv.vector = icoll_base + HW_ICOLL_VECTOR;
icoll_priv.levelack = icoll_base + HW_ICOLL_LEVELACK;
@@ -162,3 +234,35 @@ static int __init icoll_of_init(struct device_node *np,
return icoll_domain ? 0 : -ENODEV;
}
IRQCHIP_DECLARE(mxs, "fsl,icoll", icoll_of_init);
+
+static int __init asm9260_of_init(struct device_node *np,
+ struct device_node *interrupt_parent)
+{
+ void __iomem *icoll_base;
+ int i;
+
+ icoll_priv.type = ASM9260_ICOLL;
+
+ icoll_base = icoll_init_iobase(np);
+ icoll_priv.vector = icoll_base + ASM9260_HW_ICOLL_VECTOR;
+ icoll_priv.levelack = icoll_base + ASM9260_HW_ICOLL_LEVELACK;
+ icoll_priv.ctrl = icoll_base + ASM9260_HW_ICOLL_CTRL;
+ icoll_priv.stat = icoll_base + ASM9260_HW_ICOLL_STAT_OFFSET;
+ icoll_priv.intr = icoll_base + ASM9260_HW_ICOLL_INTERRUPT0;
+ icoll_priv.intr_per_reg = 4;
+ icoll_priv.clear = icoll_base + ASM9260_HW_ICOLL_CLEAR0;
+
+ writel_relaxed(ASM9260_BM_CTRL_IRQ_ENABLE,
+ icoll_priv.ctrl);
+ /*
+ * ASM9260 don't provide reset bit. So, we need to set level 0
+ * manually.
+ */
+ for (i = 0; i < 16 * 0x10; i += 0x10)
+ writel(0, icoll_priv.intr + i);
+
+ icoll_add_domain(np, ASM9260_NUM_IRQS);
+
+ return icoll_domain ? 0 : -ENODEV;
+}
+IRQCHIP_DECLARE(asm9260, "alphascale,asm9260-icoll", asm9260_of_init);
--
2.5.0

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