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authorPaul Mundt <lethal@linux-sh.org>2010-04-13 14:43:03 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-04-13 14:43:03 +0900
commit43b8774dc409ea5d9369b978e2e7bc79289f0522 (patch)
tree13aa346ff8f30786e8ce3ccfdd8341d182ce4c87
parent12129fea50edcd696a9556523b058d6c445f21d8 (diff)
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sh: intc: userimask support.
This adds support for hardware-assisted userspace irq masking for special priority levels. Due to the SR.IMASK interactivity, only some platforms implement this in hardware (including but not limited to SH-4A interrupt controllers, and ARM-based SH-Mobile CPUs). Each CPU needs to wire this up on its own, for now only SH7786 is wired up as an example. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
-rw-r--r--arch/sh/Kconfig2
-rw-r--r--arch/sh/kernel/cpu/sh4a/setup-sh7786.c3
-rw-r--r--drivers/sh/Kconfig13
-rw-r--r--drivers/sh/intc.c69
-rw-r--r--include/linux/sh_intc.h9
5 files changed, 94 insertions, 2 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 8d90564c2bc..ba86bfba95a 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -732,6 +732,8 @@ config GUSA_RB
LLSC, this should be more efficient than the other alternative of
disabling interrupts around the atomic sequence.
+source "drivers/sh/Kconfig"
+
endmenu
menu "Boot options"
diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7786.c b/arch/sh/kernel/cpu/sh4a/setup-sh7786.c
index 61e54919087..235edf8065d 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-sh7786.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-sh7786.c
@@ -21,6 +21,7 @@
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/sh_timer.h>
+#include <linux/sh_intc.h>
#include <cpu/dma-register.h>
#include <asm/mmzone.h>
#include <asm/dmaengine.h>
@@ -907,6 +908,7 @@ static DECLARE_INTC_DESC(intc_desc_irl4567, "sh7786-irl4567", vectors_irl4567,
#define INTC_INTMSK2 INTMSK2
#define INTC_INTMSKCLR1 CnINTMSKCLR1
#define INTC_INTMSKCLR2 INTMSKCLR2
+#define INTC_USERIMASK 0xfe411000
void __init plat_irq_setup(void)
{
@@ -921,6 +923,7 @@ void __init plat_irq_setup(void)
__raw_writel(__raw_readl(INTC_ICR0) & ~0x00c00000, INTC_ICR0);
register_intc_controller(&intc_desc);
+ register_intc_userimask(INTC_USERIMASK);
}
void __init plat_irq_setup_pins(int mode)
diff --git a/drivers/sh/Kconfig b/drivers/sh/Kconfig
new file mode 100644
index 00000000000..22c3cdaf22f
--- /dev/null
+++ b/drivers/sh/Kconfig
@@ -0,0 +1,13 @@
+config INTC_USERIMASK
+ bool "Userspace interrupt masking support"
+ depends on ARCH_SHMOBILE || (SUPERH && CPU_SH4A)
+ help
+ This enables support for hardware-assisted userspace hardirq
+ masking.
+
+ SH-4A and newer interrupt blocks all support a special shadowed
+ page with all non-masking registers obscured when mapped in to
+ userspace. This is primarily for use by userspace device
+ drivers that are using special priority levels.
+
+ If in doubt, say N.
diff --git a/drivers/sh/intc.c b/drivers/sh/intc.c
index 65e15828faa..77d10acf188 100644
--- a/drivers/sh/intc.c
+++ b/drivers/sh/intc.c
@@ -27,6 +27,7 @@
#include <linux/topology.h>
#include <linux/bitmap.h>
#include <linux/cpumask.h>
+#include <asm/sizes.h>
#define _INTC_MK(fn, mode, addr_e, addr_d, width, shift) \
((shift) | ((width) << 5) | ((fn) << 9) | ((mode) << 13) | \
@@ -94,7 +95,8 @@ static DEFINE_SPINLOCK(vector_lock);
#define SMP_NR(d, x) 1
#endif
-static unsigned int intc_prio_level[NR_IRQS]; /* for now */
+static unsigned int intc_prio_level[NR_IRQS]; /* for now */
+static unsigned int default_prio_level = 2; /* 2 - 16 */
static unsigned long ack_handle[NR_IRQS];
static inline struct intc_desc_int *get_intc_desc(unsigned int irq)
@@ -787,7 +789,7 @@ static void __init intc_register_irq(struct intc_desc *desc,
/* set priority level
* - this needs to be at least 2 for 5-bit priorities on 7780
*/
- intc_prio_level[irq] = 2;
+ intc_prio_level[irq] = default_prio_level;
/* enable secondary masking method if present */
if (data[!primary])
@@ -1037,6 +1039,64 @@ err0:
return -ENOMEM;
}
+#ifdef CONFIG_INTC_USERIMASK
+static void __iomem *uimask;
+
+int register_intc_userimask(unsigned long addr)
+{
+ if (unlikely(uimask))
+ return -EBUSY;
+
+ uimask = ioremap_nocache(addr, SZ_4K);
+ if (unlikely(!uimask))
+ return -ENOMEM;
+
+ pr_info("intc: userimask support registered for levels 0 -> %d\n",
+ default_prio_level - 1);
+
+ return 0;
+}
+
+static ssize_t
+show_intc_userimask(struct sysdev_class *cls,
+ struct sysdev_class_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", (__raw_readl(uimask) >> 4) & 0xf);
+}
+
+static ssize_t
+store_intc_userimask(struct sysdev_class *cls,
+ struct sysdev_class_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long level;
+
+ level = simple_strtoul(buf, NULL, 10);
+
+ /*
+ * Minimal acceptable IRQ levels are in the 2 - 16 range, but
+ * these are chomped so as to not interfere with normal IRQs.
+ *
+ * Level 1 is a special case on some CPUs in that it's not
+ * directly settable, but given that USERIMASK cuts off below a
+ * certain level, we don't care about this limitation here.
+ * Level 0 on the other hand equates to user masking disabled.
+ *
+ * We use default_prio_level as a cut off so that only special
+ * case opt-in IRQs can be mangled.
+ */
+ if (level >= default_prio_level)
+ return -EINVAL;
+
+ __raw_writel(0xa5 << 24 | level << 4, uimask);
+
+ return count;
+}
+
+static SYSDEV_CLASS_ATTR(userimask, S_IRUSR | S_IWUSR,
+ show_intc_userimask, store_intc_userimask);
+#endif
+
static ssize_t
show_intc_name(struct sys_device *dev, struct sysdev_attribute *attr, char *buf)
{
@@ -1108,6 +1168,11 @@ static int __init register_intc_sysdevs(void)
int id = 0;
error = sysdev_class_register(&intc_sysdev_class);
+#ifdef CONFIG_INTC_USERIMASK
+ if (!error && uimask)
+ error = sysdev_class_create_file(&intc_sysdev_class,
+ &attr_userimask);
+#endif
if (!error) {
list_for_each_entry(d, &intc_list, list) {
d->sysdev.id = id;
diff --git a/include/linux/sh_intc.h b/include/linux/sh_intc.h
index 01d8168c5a1..f0e8cca199c 100644
--- a/include/linux/sh_intc.h
+++ b/include/linux/sh_intc.h
@@ -99,6 +99,15 @@ struct intc_desc symbol __initdata = { \
int __init register_intc_controller(struct intc_desc *desc);
int intc_set_priority(unsigned int irq, unsigned int prio);
+#ifdef CONFIG_INTC_USERIMASK
+int register_intc_userimask(unsigned long addr);
+#else
+static inline int register_intc_userimask(unsigned long addr)
+{
+ return 0;
+}
+#endif
+
int reserve_irq_vector(unsigned int irq);
void reserve_irq_legacy(void);