diff options
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/bitops/find.h | 12 | ||||
| -rw-r--r-- | include/asm-generic/gpio.h | 235 | ||||
| -rw-r--r-- | include/asm-generic/hugetlb.h | 4 | ||||
| -rw-r--r-- | include/asm-generic/preempt.h | 105 | ||||
| -rw-r--r-- | include/asm-generic/siginfo.h | 2 | ||||
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 1 | ||||
| -rw-r--r-- | include/asm-generic/vtime.h | 1 |
7 files changed, 195 insertions, 165 deletions
diff --git a/include/asm-generic/bitops/find.h b/include/asm-generic/bitops/find.h index 71c778033f57..998d4d544f18 100644 --- a/include/asm-generic/bitops/find.h +++ b/include/asm-generic/bitops/find.h @@ -7,6 +7,9 @@ * @addr: The address to base the search on * @offset: The bitnumber to start searching at * @size: The bitmap size in bits + * + * Returns the bit number for the next set bit + * If no bits are set, returns @size. */ extern unsigned long find_next_bit(const unsigned long *addr, unsigned long size, unsigned long offset); @@ -18,6 +21,9 @@ extern unsigned long find_next_bit(const unsigned long *addr, unsigned long * @addr: The address to base the search on * @offset: The bitnumber to start searching at * @size: The bitmap size in bits + * + * Returns the bit number of the next zero bit + * If no bits are zero, returns @size. */ extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size, unsigned long offset); @@ -28,9 +34,10 @@ extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned /** * find_first_bit - find the first set bit in a memory region * @addr: The address to start the search at - * @size: The maximum size to search + * @size: The maximum number of bits to search * * Returns the bit number of the first set bit. + * If no bits are set, returns @size. */ extern unsigned long find_first_bit(const unsigned long *addr, unsigned long size); @@ -38,9 +45,10 @@ extern unsigned long find_first_bit(const unsigned long *addr, /** * find_first_zero_bit - find the first cleared bit in a memory region * @addr: The address to start the search at - * @size: The maximum size to search + * @size: The maximum number of bits to search * * Returns the bit number of the first cleared bit. + * If no bits are zero, returns @size. */ extern unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size); diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index bde646995d10..a5f56a0213a7 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -10,6 +10,8 @@ #ifdef CONFIG_GPIOLIB #include <linux/compiler.h> +#include <linux/gpio/driver.h> +#include <linux/gpio/consumer.h> /* Platforms may implement their GPIO interface with library code, * at a small performance cost for non-inlined operations and some @@ -49,122 +51,11 @@ struct module; struct device_node; struct gpio_desc; -/** - * struct gpio_chip - abstract a GPIO controller - * @label: for diagnostics - * @dev: optional device providing the GPIOs - * @owner: helps prevent removal of modules exporting active GPIOs - * @list: links gpio_chips together for traversal - * @request: optional hook for chip-specific activation, such as - * enabling module power and clock; may sleep - * @free: optional hook for chip-specific deactivation, such as - * disabling module power and clock; may sleep - * @get_direction: returns direction for signal "offset", 0=out, 1=in, - * (same as GPIOF_DIR_XXX), or negative error - * @direction_input: configures signal "offset" as input, or returns error - * @get: returns value for signal "offset"; for output signals this - * returns either the value actually sensed, or zero - * @direction_output: configures signal "offset" as output, or returns error - * @set_debounce: optional hook for setting debounce time for specified gpio in - * interrupt triggered gpio chips - * @set: assigns output value for signal "offset" - * @to_irq: optional hook supporting non-static gpio_to_irq() mappings; - * implementation may not sleep - * @dbg_show: optional routine to show contents in debugfs; default code - * will be used when this is omitted, but custom code can show extra - * state (such as pullup/pulldown configuration). - * @base: identifies the first GPIO number handled by this chip; or, if - * negative during registration, requests dynamic ID allocation. - * @ngpio: the number of GPIOs handled by this controller; the last GPIO - * handled is (base + ngpio - 1). - * @desc: array of ngpio descriptors. Private. - * @can_sleep: flag must be set iff get()/set() methods sleep, as they - * must while accessing GPIO expander chips over I2C or SPI - * @names: if set, must be an array of strings to use as alternative - * names for the GPIOs in this chip. Any entry in the array - * may be NULL if there is no alias for the GPIO, however the - * array must be @ngpio entries long. A name can include a single printk - * format specifier for an unsigned int. It is substituted by the actual - * number of the gpio. - * - * A gpio_chip can help platforms abstract various sources of GPIOs so - * they can all be accessed through a common programing interface. - * Example sources would be SOC controllers, FPGAs, multifunction - * chips, dedicated GPIO expanders, and so on. - * - * Each chip controls a number of signals, identified in method calls - * by "offset" values in the range 0..(@ngpio - 1). When those signals - * are referenced through calls like gpio_get_value(gpio), the offset - * is calculated by subtracting @base from the gpio number. - */ -struct gpio_chip { - const char *label; - struct device *dev; - struct module *owner; - struct list_head list; - - int (*request)(struct gpio_chip *chip, - unsigned offset); - void (*free)(struct gpio_chip *chip, - unsigned offset); - int (*get_direction)(struct gpio_chip *chip, - unsigned offset); - int (*direction_input)(struct gpio_chip *chip, - unsigned offset); - int (*get)(struct gpio_chip *chip, - unsigned offset); - int (*direction_output)(struct gpio_chip *chip, - unsigned offset, int value); - int (*set_debounce)(struct gpio_chip *chip, - unsigned offset, unsigned debounce); - - void (*set)(struct gpio_chip *chip, - unsigned offset, int value); - - int (*to_irq)(struct gpio_chip *chip, - unsigned offset); - - void (*dbg_show)(struct seq_file *s, - struct gpio_chip *chip); - int base; - u16 ngpio; - struct gpio_desc *desc; - const char *const *names; - unsigned can_sleep:1; - unsigned exported:1; - -#if defined(CONFIG_OF_GPIO) - /* - * If CONFIG_OF is enabled, then all GPIO controllers described in the - * device tree automatically may have an OF translation - */ - struct device_node *of_node; - int of_gpio_n_cells; - int (*of_xlate)(struct gpio_chip *gc, - const struct of_phandle_args *gpiospec, u32 *flags); -#endif -#ifdef CONFIG_PINCTRL - /* - * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally - * describe the actual pin range which they serve in an SoC. This - * information would be used by pinctrl subsystem to configure - * corresponding pins for gpio usage. - */ - struct list_head pin_ranges; -#endif -}; - -extern const char *gpiochip_is_requested(struct gpio_chip *chip, - unsigned offset); -extern struct gpio_chip *gpio_to_chip(unsigned gpio); - -/* add/remove chips */ -extern int gpiochip_add(struct gpio_chip *chip); -extern int __must_check gpiochip_remove(struct gpio_chip *chip); -extern struct gpio_chip *gpiochip_find(void *data, - int (*match)(struct gpio_chip *chip, - void *data)); - +/* caller holds gpio_lock *OR* gpio is marked as requested */ +static inline struct gpio_chip *gpio_to_chip(unsigned gpio) +{ + return gpiod_to_chip(gpio_to_desc(gpio)); +} /* Always use the library code for GPIO management calls, * or when sleeping may be involved. @@ -172,43 +63,84 @@ extern struct gpio_chip *gpiochip_find(void *data, extern int gpio_request(unsigned gpio, const char *label); extern void gpio_free(unsigned gpio); -extern int gpio_direction_input(unsigned gpio); -extern int gpio_direction_output(unsigned gpio, int value); +static inline int gpio_direction_input(unsigned gpio) +{ + return gpiod_direction_input(gpio_to_desc(gpio)); +} +static inline int gpio_direction_output(unsigned gpio, int value) +{ + return gpiod_direction_output(gpio_to_desc(gpio), value); +} -extern int gpio_set_debounce(unsigned gpio, unsigned debounce); +static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) +{ + return gpiod_set_debounce(gpio_to_desc(gpio), debounce); +} -extern int gpio_get_value_cansleep(unsigned gpio); -extern void gpio_set_value_cansleep(unsigned gpio, int value); +static inline int gpio_get_value_cansleep(unsigned gpio) +{ + return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio)); +} +static inline void gpio_set_value_cansleep(unsigned gpio, int value) +{ + return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value); +} /* A platform's <asm/gpio.h> code may want to inline the I/O calls when * the GPIO is constant and refers to some always-present controller, * giving direct access to chip registers and tight bitbanging loops. */ -extern int __gpio_get_value(unsigned gpio); -extern void __gpio_set_value(unsigned gpio, int value); +static inline int __gpio_get_value(unsigned gpio) +{ + return gpiod_get_raw_value(gpio_to_desc(gpio)); +} +static inline void __gpio_set_value(unsigned gpio, int value) +{ + return gpiod_set_raw_value(gpio_to_desc(gpio), value); +} -extern int __gpio_cansleep(unsigned gpio); +static inline int __gpio_cansleep(unsigned gpio) +{ + return gpiod_cansleep(gpio_to_desc(gpio)); +} -extern int __gpio_to_irq(unsigned gpio); +static inline int __gpio_to_irq(unsigned gpio) +{ + return gpiod_to_irq(gpio_to_desc(gpio)); +} + +extern int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset); +extern void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset); extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); extern int gpio_request_array(const struct gpio *array, size_t num); extern void gpio_free_array(const struct gpio *array, size_t num); -#ifdef CONFIG_GPIO_SYSFS - /* * A sysfs interface can be exported by individual drivers if they want, * but more typically is configured entirely from userspace. */ -extern int gpio_export(unsigned gpio, bool direction_may_change); -extern int gpio_export_link(struct device *dev, const char *name, - unsigned gpio); -extern int gpio_sysfs_set_active_low(unsigned gpio, int value); -extern void gpio_unexport(unsigned gpio); +static inline int gpio_export(unsigned gpio, bool direction_may_change) +{ + return gpiod_export(gpio_to_desc(gpio), direction_may_change); +} + +static inline int gpio_export_link(struct device *dev, const char *name, + unsigned gpio) +{ + return gpiod_export_link(dev, name, gpio_to_desc(gpio)); +} + +static inline int gpio_sysfs_set_active_low(unsigned gpio, int value) +{ + return gpiod_sysfs_set_active_low(gpio_to_desc(gpio), value); +} -#endif /* CONFIG_GPIO_SYSFS */ +static inline void gpio_unexport(unsigned gpio) +{ + gpiod_unexport(gpio_to_desc(gpio)); +} #ifdef CONFIG_PINCTRL @@ -228,6 +160,9 @@ struct gpio_pin_range { int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, unsigned int gpio_offset, unsigned int pin_offset, unsigned int npins); +int gpiochip_add_pingroup_range(struct gpio_chip *chip, + struct pinctrl_dev *pctldev, + unsigned int gpio_offset, const char *pin_group); void gpiochip_remove_pin_ranges(struct gpio_chip *chip); #else @@ -239,6 +174,13 @@ gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, { return 0; } +static inline int +gpiochip_add_pingroup_range(struct gpio_chip *chip, + struct pinctrl_dev *pctldev, + unsigned int gpio_offset, const char *pin_group) +{ + return 0; +} static inline void gpiochip_remove_pin_ranges(struct gpio_chip *chip) @@ -278,31 +220,4 @@ static inline void gpio_set_value_cansleep(unsigned gpio, int value) #endif /* !CONFIG_GPIOLIB */ -#ifndef CONFIG_GPIO_SYSFS - -struct device; - -/* sysfs support is only available with gpiolib, where it's optional */ - -static inline int gpio_export(unsigned gpio, bool direction_may_change) -{ - return -ENOSYS; -} - -static inline int gpio_export_link(struct device *dev, const char *name, - unsigned gpio) -{ - return -ENOSYS; -} - -static inline int gpio_sysfs_set_active_low(unsigned gpio, int value) -{ - return -ENOSYS; -} - -static inline void gpio_unexport(unsigned gpio) -{ -} -#endif /* CONFIG_GPIO_SYSFS */ - #endif /* _ASM_GENERIC_GPIO_H */ diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h index d06079c774a0..99b490b4d05a 100644 --- a/include/asm-generic/hugetlb.h +++ b/include/asm-generic/hugetlb.h @@ -6,12 +6,12 @@ static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot) return mk_pte(page, pgprot); } -static inline int huge_pte_write(pte_t pte) +static inline unsigned long huge_pte_write(pte_t pte) { return pte_write(pte); } -static inline int huge_pte_dirty(pte_t pte) +static inline unsigned long huge_pte_dirty(pte_t pte) { return pte_dirty(pte); } diff --git a/include/asm-generic/preempt.h b/include/asm-generic/preempt.h new file mode 100644 index 000000000000..ddf2b420ac8f --- /dev/null +++ b/include/asm-generic/preempt.h @@ -0,0 +1,105 @@ +#ifndef __ASM_PREEMPT_H +#define __ASM_PREEMPT_H + +#include <linux/thread_info.h> + +/* + * We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users + * that think a non-zero value indicates we cannot preempt. + */ +static __always_inline int preempt_count(void) +{ + return current_thread_info()->preempt_count & ~PREEMPT_NEED_RESCHED; +} + +static __always_inline int *preempt_count_ptr(void) +{ + return ¤t_thread_info()->preempt_count; +} + +/* + * We now loose PREEMPT_NEED_RESCHED and cause an extra reschedule; however the + * alternative is loosing a reschedule. Better schedule too often -- also this + * should be a very rare operation. + */ +static __always_inline void preempt_count_set(int pc) +{ + *preempt_count_ptr() = pc; +} + +/* + * must be macros to avoid header recursion hell + */ +#define task_preempt_count(p) \ + (task_thread_info(p)->preempt_count & ~PREEMPT_NEED_RESCHED) + +#define init_task_preempt_count(p) do { \ + task_thread_info(p)->preempt_count = PREEMPT_DISABLED; \ +} while (0) + +#define init_idle_preempt_count(p, cpu) do { \ + task_thread_info(p)->preempt_count = PREEMPT_ENABLED; \ +} while (0) + +/* + * We fold the NEED_RESCHED bit into the preempt count such that + * preempt_enable() can decrement and test for needing to reschedule with a + * single instruction. + * + * We invert the actual bit, so that when the decrement hits 0 we know we both + * need to resched (the bit is cleared) and can resched (no preempt count). + */ + +static __always_inline void set_preempt_need_resched(void) +{ + *preempt_count_ptr() &= ~PREEMPT_NEED_RESCHED; +} + +static __always_inline void clear_preempt_need_resched(void) +{ + *preempt_count_ptr() |= PREEMPT_NEED_RESCHED; +} + +static __always_inline bool test_preempt_need_resched(void) +{ + return !(*preempt_count_ptr() & PREEMPT_NEED_RESCHED); +} + +/* + * The various preempt_count add/sub methods + */ + +static __always_inline void __preempt_count_add(int val) +{ + *preempt_count_ptr() += val; +} + +static __always_inline void __preempt_count_sub(int val) +{ + *preempt_count_ptr() -= val; +} + +static __always_inline bool __preempt_count_dec_and_test(void) +{ + return !--*preempt_count_ptr(); +} + +/* + * Returns true when we need to resched and can (barring IRQ state). + */ +static __always_inline bool should_resched(void) +{ + return unlikely(!*preempt_count_ptr()); +} + +#ifdef CONFIG_PREEMPT +extern asmlinkage void preempt_schedule(void); +#define __preempt_schedule() preempt_schedule() + +#ifdef CONFIG_CONTEXT_TRACKING +extern asmlinkage void preempt_schedule_context(void); +#define __preempt_schedule_context() preempt_schedule_context() +#endif +#endif /* CONFIG_PREEMPT */ + +#endif /* __ASM_PREEMPT_H */ diff --git a/include/asm-generic/siginfo.h b/include/asm-generic/siginfo.h index b685d3bd32e2..3d1a3af5cf59 100644 --- a/include/asm-generic/siginfo.h +++ b/include/asm-generic/siginfo.h @@ -32,6 +32,6 @@ static inline void copy_siginfo(struct siginfo *to, struct siginfo *from) #endif -extern int copy_siginfo_to_user(struct siginfo __user *to, struct siginfo *from); +extern int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from); #endif diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 83e2c31e8b00..bc2121fa9132 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -473,6 +473,7 @@ #define KERNEL_CTORS() . = ALIGN(8); \ VMLINUX_SYMBOL(__ctors_start) = .; \ *(.ctors) \ + *(.init_array) \ VMLINUX_SYMBOL(__ctors_end) = .; #else #define KERNEL_CTORS() diff --git a/include/asm-generic/vtime.h b/include/asm-generic/vtime.h index e69de29bb2d1..b1a49677fe25 100644 --- a/include/asm-generic/vtime.h +++ b/include/asm-generic/vtime.h @@ -0,0 +1 @@ +/* no content, but patch(1) dislikes empty files */ |