From bd9a4c7df256cee4e9f6a4b56baa3b89d63f0f1e Mon Sep 17 00:00:00 2001 From: Ohad Ben-Cohen Date: Thu, 17 Feb 2011 09:52:03 -0800 Subject: drivers: hwspinlock: add framework Add a platform-independent hwspinlock framework. Hardware spinlock devices are needed, e.g., in order to access data that is shared between remote processors, that otherwise have no alternative mechanism to accomplish synchronization and mutual exclusion operations. Signed-off-by: Ohad Ben-Cohen Cc: Hari Kanigeri Cc: Benoit Cousson Cc: Kevin Hilman Cc: Grant Likely Cc: Paul Walmsley Cc: Russell King Acked-by: Arnd Bergmann Signed-off-by: Tony Lindgren --- include/linux/hwspinlock.h | 292 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 292 insertions(+) create mode 100644 include/linux/hwspinlock.h (limited to 'include/linux') diff --git a/include/linux/hwspinlock.h b/include/linux/hwspinlock.h new file mode 100644 index 000000000000..8390efc457eb --- /dev/null +++ b/include/linux/hwspinlock.h @@ -0,0 +1,292 @@ +/* + * Hardware spinlock public header + * + * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com + * + * Contact: Ohad Ben-Cohen + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __LINUX_HWSPINLOCK_H +#define __LINUX_HWSPINLOCK_H + +#include +#include + +/* hwspinlock mode argument */ +#define HWLOCK_IRQSTATE 0x01 /* Disable interrupts, save state */ +#define HWLOCK_IRQ 0x02 /* Disable interrupts, don't save state */ + +struct hwspinlock; + +#if defined(CONFIG_HWSPINLOCK) || defined(CONFIG_HWSPINLOCK_MODULE) + +int hwspin_lock_register(struct hwspinlock *lock); +struct hwspinlock *hwspin_lock_unregister(unsigned int id); +struct hwspinlock *hwspin_lock_request(void); +struct hwspinlock *hwspin_lock_request_specific(unsigned int id); +int hwspin_lock_free(struct hwspinlock *hwlock); +int hwspin_lock_get_id(struct hwspinlock *hwlock); +int __hwspin_lock_timeout(struct hwspinlock *, unsigned int, int, + unsigned long *); +int __hwspin_trylock(struct hwspinlock *, int, unsigned long *); +void __hwspin_unlock(struct hwspinlock *, int, unsigned long *); + +#else /* !CONFIG_HWSPINLOCK */ + +/* + * We don't want these functions to fail if CONFIG_HWSPINLOCK is not + * enabled. We prefer to silently succeed in this case, and let the + * code path get compiled away. This way, if CONFIG_HWSPINLOCK is not + * required on a given setup, users will still work. + * + * The only exception is hwspin_lock_register/hwspin_lock_unregister, with which + * we _do_ want users to fail (no point in registering hwspinlock instances if + * the framework is not available). + * + * Note: ERR_PTR(-ENODEV) will still be considered a success for NULL-checking + * users. Others, which care, can still check this with IS_ERR. + */ +static inline struct hwspinlock *hwspin_lock_request(void) +{ + return ERR_PTR(-ENODEV); +} + +static inline struct hwspinlock *hwspin_lock_request_specific(unsigned int id) +{ + return ERR_PTR(-ENODEV); +} + +static inline int hwspin_lock_free(struct hwspinlock *hwlock) +{ + return 0; +} + +static inline +int __hwspin_lock_timeout(struct hwspinlock *hwlock, unsigned int to, + int mode, unsigned long *flags) +{ + return 0; +} + +static inline +int __hwspin_trylock(struct hwspinlock *hwlock, int mode, unsigned long *flags) +{ + return 0; +} + +static inline +void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags) +{ + return 0; +} + +static inline int hwspin_lock_get_id(struct hwspinlock *hwlock) +{ + return 0; +} + +static inline int hwspin_lock_register(struct hwspinlock *hwlock) +{ + return -ENODEV; +} + +static inline struct hwspinlock *hwspin_lock_unregister(unsigned int id) +{ + return NULL; +} + +#endif /* !CONFIG_HWSPINLOCK */ + +/** + * hwspin_trylock_irqsave() - try to lock an hwspinlock, disable interrupts + * @hwlock: an hwspinlock which we want to trylock + * @flags: a pointer to where the caller's interrupt state will be saved at + * + * This function attempts to lock the underlying hwspinlock, and will + * immediately fail if the hwspinlock is already locked. + * + * Upon a successful return from this function, preemption and local + * interrupts are disabled (previous interrupts state is saved at @flags), + * so the caller must not sleep, and is advised to release the hwspinlock + * as soon as possible. + * + * Returns 0 if we successfully locked the hwspinlock, -EBUSY if + * the hwspinlock was already taken, and -EINVAL if @hwlock is invalid. + */ +static inline +int hwspin_trylock_irqsave(struct hwspinlock *hwlock, unsigned long *flags) +{ + return __hwspin_trylock(hwlock, HWLOCK_IRQSTATE, flags); +} + +/** + * hwspin_trylock_irq() - try to lock an hwspinlock, disable interrupts + * @hwlock: an hwspinlock which we want to trylock + * + * This function attempts to lock the underlying hwspinlock, and will + * immediately fail if the hwspinlock is already locked. + * + * Upon a successful return from this function, preemption and local + * interrupts are disabled, so the caller must not sleep, and is advised + * to release the hwspinlock as soon as possible. + * + * Returns 0 if we successfully locked the hwspinlock, -EBUSY if + * the hwspinlock was already taken, and -EINVAL if @hwlock is invalid. + */ +static inline int hwspin_trylock_irq(struct hwspinlock *hwlock) +{ + return __hwspin_trylock(hwlock, HWLOCK_IRQ, NULL); +} + +/** + * hwspin_trylock() - attempt to lock a specific hwspinlock + * @hwlock: an hwspinlock which we want to trylock + * + * This function attempts to lock an hwspinlock, and will immediately fail + * if the hwspinlock is already taken. + * + * Upon a successful return from this function, preemption is disabled, + * so the caller must not sleep, and is advised to release the hwspinlock + * as soon as possible. This is required in order to minimize remote cores + * polling on the hardware interconnect. + * + * Returns 0 if we successfully locked the hwspinlock, -EBUSY if + * the hwspinlock was already taken, and -EINVAL if @hwlock is invalid. + */ +static inline int hwspin_trylock(struct hwspinlock *hwlock) +{ + return __hwspin_trylock(hwlock, 0, NULL); +} + +/** + * hwspin_lock_timeout_irqsave() - lock hwspinlock, with timeout, disable irqs + * @hwlock: the hwspinlock to be locked + * @to: timeout value in msecs + * @flags: a pointer to where the caller's interrupt state will be saved at + * + * This function locks the underlying @hwlock. If the @hwlock + * is already taken, the function will busy loop waiting for it to + * be released, but give up when @timeout msecs have elapsed. + * + * Upon a successful return from this function, preemption and local interrupts + * are disabled (plus previous interrupt state is saved), so the caller must + * not sleep, and is advised to release the hwspinlock as soon as possible. + * + * Returns 0 when the @hwlock was successfully taken, and an appropriate + * error code otherwise (most notably an -ETIMEDOUT if the @hwlock is still + * busy after @timeout msecs). The function will never sleep. + */ +static inline int hwspin_lock_timeout_irqsave(struct hwspinlock *hwlock, + unsigned int to, unsigned long *flags) +{ + return __hwspin_lock_timeout(hwlock, to, HWLOCK_IRQSTATE, flags); +} + +/** + * hwspin_lock_timeout_irq() - lock hwspinlock, with timeout, disable irqs + * @hwlock: the hwspinlock to be locked + * @to: timeout value in msecs + * + * This function locks the underlying @hwlock. If the @hwlock + * is already taken, the function will busy loop waiting for it to + * be released, but give up when @timeout msecs have elapsed. + * + * Upon a successful return from this function, preemption and local interrupts + * are disabled so the caller must not sleep, and is advised to release the + * hwspinlock as soon as possible. + * + * Returns 0 when the @hwlock was successfully taken, and an appropriate + * error code otherwise (most notably an -ETIMEDOUT if the @hwlock is still + * busy after @timeout msecs). The function will never sleep. + */ +static inline +int hwspin_lock_timeout_irq(struct hwspinlock *hwlock, unsigned int to) +{ + return __hwspin_lock_timeout(hwlock, to, HWLOCK_IRQ, NULL); +} + +/** + * hwspin_lock_timeout() - lock an hwspinlock with timeout limit + * @hwlock: the hwspinlock to be locked + * @to: timeout value in msecs + * + * This function locks the underlying @hwlock. If the @hwlock + * is already taken, the function will busy loop waiting for it to + * be released, but give up when @timeout msecs have elapsed. + * + * Upon a successful return from this function, preemption is disabled + * so the caller must not sleep, and is advised to release the hwspinlock + * as soon as possible. + * This is required in order to minimize remote cores polling on the + * hardware interconnect. + * + * Returns 0 when the @hwlock was successfully taken, and an appropriate + * error code otherwise (most notably an -ETIMEDOUT if the @hwlock is still + * busy after @timeout msecs). The function will never sleep. + */ +static inline +int hwspin_lock_timeout(struct hwspinlock *hwlock, unsigned int to) +{ + return __hwspin_lock_timeout(hwlock, to, 0, NULL); +} + +/** + * hwspin_unlock_irqrestore() - unlock hwspinlock, restore irq state + * @hwlock: a previously-acquired hwspinlock which we want to unlock + * @flags: previous caller's interrupt state to restore + * + * This function will unlock a specific hwspinlock, enable preemption and + * restore the previous state of the local interrupts. It should be used + * to undo, e.g., hwspin_trylock_irqsave(). + * + * @hwlock must be already locked before calling this function: it is a bug + * to call unlock on a @hwlock that is already unlocked. + */ +static inline void hwspin_unlock_irqrestore(struct hwspinlock *hwlock, + unsigned long *flags) +{ + __hwspin_unlock(hwlock, HWLOCK_IRQSTATE, flags); +} + +/** + * hwspin_unlock_irq() - unlock hwspinlock, enable interrupts + * @hwlock: a previously-acquired hwspinlock which we want to unlock + * + * This function will unlock a specific hwspinlock, enable preemption and + * enable local interrupts. Should be used to undo hwspin_lock_irq(). + * + * @hwlock must be already locked (e.g. by hwspin_trylock_irq()) before + * calling this function: it is a bug to call unlock on a @hwlock that is + * already unlocked. + */ +static inline void hwspin_unlock_irq(struct hwspinlock *hwlock) +{ + __hwspin_unlock(hwlock, HWLOCK_IRQ, NULL); +} + +/** + * hwspin_unlock() - unlock hwspinlock + * @hwlock: a previously-acquired hwspinlock which we want to unlock + * + * This function will unlock a specific hwspinlock and enable preemption + * back. + * + * @hwlock must be already locked (e.g. by hwspin_trylock()) before calling + * this function: it is a bug to call unlock on a @hwlock that is already + * unlocked. + */ +static inline void hwspin_unlock(struct hwspinlock *hwlock) +{ + __hwspin_unlock(hwlock, 0, NULL); +} + +#endif /* __LINUX_HWSPINLOCK_H */ -- cgit v1.2.2 From 1435ca0fc1a269f9496343e24223a0fc430aff7a Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Mon, 7 Feb 2011 10:46:58 +0200 Subject: OMAP: OneNAND: fix 104MHz support 104MHz needs a latency of 8 clock cycles and the VHF flag must be set. Also t_rdyo is specified as "not applicable" so pick a lower value, and force at least 1 clk between AVD High to OE Low. Signed-off-by: Adrian Hunter Signed-off-by: Tony Lindgren --- include/linux/mtd/onenand_regs.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/mtd/onenand_regs.h b/include/linux/mtd/onenand_regs.h index cd6f3b431195..d60130f88eed 100644 --- a/include/linux/mtd/onenand_regs.h +++ b/include/linux/mtd/onenand_regs.h @@ -168,6 +168,7 @@ #define ONENAND_SYS_CFG1_INT (1 << 6) #define ONENAND_SYS_CFG1_IOBE (1 << 5) #define ONENAND_SYS_CFG1_RDY_CONF (1 << 4) +#define ONENAND_SYS_CFG1_VHF (1 << 3) #define ONENAND_SYS_CFG1_HF (1 << 2) #define ONENAND_SYS_CFG1_SYNC_WRITE (1 << 1) -- cgit v1.2.2 From 0a0d128d023a49eb8afa0e988e6773416318a0b5 Mon Sep 17 00:00:00 2001 From: Ilkka Koskinen Date: Wed, 2 Mar 2011 13:24:06 +0000 Subject: mfd: twl4030_codec: Remove unused and duplicate audio_mclk fields audio_mclk can be queried from mfd driver. Therefore, it is not needed in twl4030_codec_audio_data or in twl4030_codec_vibra_data anymore. Signed-off-by: Ilkka Koskinen Acked-by: Peter Ujfalusi Acked-by: Mark Brown Acked-by: Samuel Ortiz Signed-off-by: Tony Lindgren --- include/linux/i2c/twl.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h index 61b9609e55f2..9d88b717111a 100644 --- a/include/linux/i2c/twl.h +++ b/include/linux/i2c/twl.h @@ -637,7 +637,6 @@ extern void twl4030_power_init(struct twl4030_power_data *triton2_scripts); extern int twl4030_remove_script(u8 flags); struct twl4030_codec_audio_data { - unsigned int audio_mclk; /* not used, will be removed */ unsigned int digimic_delay; /* in ms */ unsigned int ramp_delay_value; unsigned int offset_cncl_path; @@ -648,7 +647,6 @@ struct twl4030_codec_audio_data { }; struct twl4030_codec_vibra_data { - unsigned int audio_mclk; unsigned int coexist; }; -- cgit v1.2.2