diff options
| -rw-r--r-- | arch/sh/Kconfig | 2 | ||||
| -rw-r--r-- | arch/sh/kernel/cpu/sh4a/setup-sh7786.c | 3 | ||||
| -rw-r--r-- | drivers/sh/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/sh/intc.c | 69 | ||||
| -rw-r--r-- | include/linux/sh_intc.h | 9 |
5 files changed, 94 insertions, 2 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 8d90564c2bcf..ba86bfba95ac 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 61e549190873..235edf8065df 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 000000000000..22c3cdaf22fe --- /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 65e15828faaa..77d10acf1884 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 01d8168c5a1b..f0e8cca199c7 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); |