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Subject[PATCH v4 04/37] ARM: davinci: select GENERIC_IRQ_MULTI_HANDLER
Date
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

In order to support SPARSE_IRQ we first need to make davinci use the
generic irq handler for ARM. Translate the legacy assembly to C and
put the irq handlers into their respective drivers (aintc and cp-intc).

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
arch/arm/Kconfig | 1 +
arch/arm/mach-davinci/cp_intc.c | 28 +++++++++++++
.../mach-davinci/include/mach/entry-macro.S | 39 -------------------
arch/arm/mach-davinci/irq.c | 23 +++++++++++
4 files changed, 52 insertions(+), 39 deletions(-)
delete mode 100644 arch/arm/mach-davinci/include/mach/entry-macro.S

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 664e918e2624..f7770fdcad68 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -589,6 +589,7 @@ config ARCH_DAVINCI
select GENERIC_ALLOCATOR
select GENERIC_CLOCKEVENTS
select GENERIC_IRQ_CHIP
+ select GENERIC_IRQ_MULTI_HANDLER
select GPIOLIB
select HAVE_IDE
select PM_GENERIC_DOMAINS if PM
diff --git a/arch/arm/mach-davinci/cp_intc.c b/arch/arm/mach-davinci/cp_intc.c
index 67805ca74ff8..4a372add8cf9 100644
--- a/arch/arm/mach-davinci/cp_intc.c
+++ b/arch/arm/mach-davinci/cp_intc.c
@@ -19,9 +19,13 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>

+#include <asm/exception.h>
#include <mach/common.h>
#include "cp_intc.h"

+#define DAVINCI_CP_INTC_PRI_INDX_MASK GENMASK(9, 0)
+#define DAVINCI_CP_INTC_GPIR_NONE BIT(31)
+
static inline unsigned int cp_intc_read(unsigned offset)
{
return __raw_readl(davinci_intc_base + offset);
@@ -97,6 +101,28 @@ static struct irq_chip cp_intc_irq_chip = {

static struct irq_domain *cp_intc_domain;

+static asmlinkage void __exception_irq_entry
+cp_intc_handle_irq(struct pt_regs *regs)
+{
+ int gpir, irqnr, none;
+
+ /*
+ * The interrupt number is in first ten bits. The NONE field set to 1
+ * indicates a spurious irq.
+ */
+
+ gpir = cp_intc_read(CP_INTC_PRIO_IDX);
+ irqnr = gpir & DAVINCI_CP_INTC_PRI_INDX_MASK;
+ none = gpir & DAVINCI_CP_INTC_GPIR_NONE;
+
+ if (unlikely(none)) {
+ pr_err_once("%s: spurious irq!\n", __func__);
+ return;
+ }
+
+ handle_domain_irq(cp_intc_domain, irqnr, regs);
+}
+
static int cp_intc_host_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
@@ -196,6 +222,8 @@ int __init cp_intc_of_init(struct device_node *node, struct device_node *parent)
return -EINVAL;
}

+ set_handle_irq(cp_intc_handle_irq);
+
/* Enable global interrupt */
cp_intc_write(1, CP_INTC_GLOBAL_ENABLE);

diff --git a/arch/arm/mach-davinci/include/mach/entry-macro.S b/arch/arm/mach-davinci/include/mach/entry-macro.S
deleted file mode 100644
index cf5f573eb5fd..000000000000
--- a/arch/arm/mach-davinci/include/mach/entry-macro.S
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Low-level IRQ helper macros for TI DaVinci-based platforms
- *
- * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
- *
- * 2007 (c) MontaVista Software, Inc. 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.
- */
-#include <mach/irqs.h>
-
- .macro get_irqnr_preamble, base, tmp
- ldr \base, =davinci_intc_base
- ldr \base, [\base]
- .endm
-
- .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
-#if defined(CONFIG_AINTC) && defined(CONFIG_CP_INTC)
- ldr \tmp, =davinci_intc_type
- ldr \tmp, [\tmp]
- cmp \tmp, #DAVINCI_INTC_TYPE_CP_INTC
- beq 1001f
-#endif
-#if defined(CONFIG_AINTC)
- ldr \tmp, [\base, #0x14]
- movs \tmp, \tmp, lsr #2
- sub \irqnr, \tmp, #1
- b 1002f
-#endif
-#if defined(CONFIG_CP_INTC)
-1001: ldr \irqnr, [\base, #0x80] /* get irq number */
- mov \tmp, \irqnr, lsr #31
- and \irqnr, \irqnr, #0xff /* irq is in bits 0-9 */
- and \tmp, \tmp, #0x1
- cmp \tmp, #0x1
-#endif
-1002:
- .endm
diff --git a/arch/arm/mach-davinci/irq.c b/arch/arm/mach-davinci/irq.c
index efba6dbdfd62..363ca6d76cb0 100644
--- a/arch/arm/mach-davinci/irq.c
+++ b/arch/arm/mach-davinci/irq.c
@@ -29,11 +29,13 @@
#include <mach/cputype.h>
#include <mach/common.h>
#include <asm/mach/irq.h>
+#include <asm/exception.h>

#define FIQ_REG0_OFFSET 0x0000
#define FIQ_REG1_OFFSET 0x0004
#define IRQ_REG0_OFFSET 0x0008
#define IRQ_REG1_OFFSET 0x000C
+#define IRQ_IRQENTRY_OFFSET 0x0014
#define IRQ_ENT_REG0_OFFSET 0x0018
#define IRQ_ENT_REG1_OFFSET 0x001C
#define IRQ_INCTL_REG_OFFSET 0x0020
@@ -48,6 +50,11 @@ static inline void davinci_irq_writel(unsigned long value, int offset)
__raw_writel(value, davinci_intc_base + offset);
}

+static inline unsigned long davinci_irq_readl(int offset)
+{
+ return readl_relaxed(davinci_intc_base + offset);
+}
+
static __init void
davinci_irq_setup_gc(void __iomem *base,
unsigned int irq_start, unsigned int num)
@@ -70,6 +77,21 @@ davinci_irq_setup_gc(void __iomem *base,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
}

+static asmlinkage void __exception_irq_entry
+davinci_handle_irq(struct pt_regs *regs)
+{
+ int irqnr = davinci_irq_readl(IRQ_IRQENTRY_OFFSET);
+
+ /*
+ * Use the formula for entry vector index generation from section
+ * 8.3.3 of the manual.
+ */
+ irqnr >>= 2;
+ irqnr -= 1;
+
+ handle_domain_irq(davinci_irq_domain, irqnr, regs);
+}
+
/* ARM Interrupt Controller Initialization */
void __init davinci_irq_init(void)
{
@@ -133,4 +155,5 @@ void __init davinci_irq_init(void)
davinci_irq_setup_gc(davinci_intc_base + j, irq_base + i, 32);

irq_set_handler(IRQ_TINT1_TINT34, handle_level_irq);
+ set_handle_irq(davinci_handle_irq);
}
--
2.20.1
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