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author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 10:52:35 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 10:52:35 -0800 |
commit | 525995d77ca08dfc2ba6f8e606f93694271dbd66 (patch) | |
tree | be9ddad66cd1301eea8dab7814cbda144a909e35 /Documentation | |
parent | e4bdda1bc3123a9e65f4dd93a23041fde8ed3dc2 (diff) | |
parent | 64a2b168023bfd09037ba760838762e56c44178e (diff) | |
download | lwn-525995d77ca08dfc2ba6f8e606f93694271dbd66.tar.gz lwn-525995d77ca08dfc2ba6f8e606f93694271dbd66.zip |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin: (88 commits)
Blackfin: Convert BUG() to use unreachable()
Blackfin: define __NR_recvmmsg
Blackfin: drop duplicate sched_clock
Blackfin: NOMPU: skip DMA ICPLB hole when it is redundant
Blackfin: MPU: add missing __init markings
Blackfin: add support for TIF_NOTIFY_RESUME
Blackfin: kgdb_test: clean up code a bit
Blackfin: convert kgdbtest to proc_fops
Blackfin: convert cyc2ns() to clocksource_cyc2ns()
Blackfin: ip0x: pull in asm/portmux.h for P_xxx defines
Blackfin: drop unused ax88180 resources
Blackfin: bf537-stamp: add ADF702x network driver resources
Blackfin: bf537-stamp: add CAN resources
Blackfin: bf537-stamp: add AD5258 i2c address
Blackfin: bf537-stamp: add adau1761 i2c address
Blackfin: bf537-stamp: add adau1371 i2c address
Blackfin: bf537-stamp: add ADP8870 resources
Blackfin: bf537-stamp: kill AD714x board-specific Kconfigs
Blackfin: bf537-stamp: update ADP5520 resources
Blackfin: bf537-stamp: add ADXL346 orientation sensing support
...
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/blackfin/00-INDEX | 3 | ||||
-rw-r--r-- | Documentation/blackfin/Makefile | 6 | ||||
-rw-r--r-- | Documentation/blackfin/cache-lock.txt | 48 | ||||
-rw-r--r-- | Documentation/blackfin/cachefeatures.txt | 10 | ||||
-rw-r--r-- | Documentation/blackfin/gptimers-example.c | 83 |
5 files changed, 89 insertions, 61 deletions
diff --git a/Documentation/blackfin/00-INDEX b/Documentation/blackfin/00-INDEX index d6840a91e1e1..c34e12440fec 100644 --- a/Documentation/blackfin/00-INDEX +++ b/Documentation/blackfin/00-INDEX @@ -1,9 +1,6 @@ 00-INDEX - This file -cache-lock.txt - - HOWTO for blackfin cache locking. - cachefeatures.txt - Supported cache features. diff --git a/Documentation/blackfin/Makefile b/Documentation/blackfin/Makefile new file mode 100644 index 000000000000..773dbb103f1c --- /dev/null +++ b/Documentation/blackfin/Makefile @@ -0,0 +1,6 @@ +obj-m := gptimers-example.o + +all: modules + +modules clean: + $(MAKE) -C ../.. SUBDIRS=$(PWD) $@ diff --git a/Documentation/blackfin/cache-lock.txt b/Documentation/blackfin/cache-lock.txt deleted file mode 100644 index 88ba1e6c31c3..000000000000 --- a/Documentation/blackfin/cache-lock.txt +++ /dev/null @@ -1,48 +0,0 @@ -/* - * File: Documentation/blackfin/cache-lock.txt - * Based on: - * Author: - * - * Created: - * Description: This file contains the simple DMA Implementation for Blackfin - * - * Rev: $Id: cache-lock.txt 2384 2006-11-01 04:12:43Z magicyang $ - * - * Modified: - * Copyright 2004-2006 Analog Devices Inc. - * - * Bugs: Enter bugs at http://blackfin.uclinux.org/ - * - */ - -How to lock your code in cache in uClinux/blackfin --------------------------------------------------- - -There are only a few steps required to lock your code into the cache. -Currently you can lock the code by Way. - -Below are the interface provided for locking the cache. - - -1. cache_grab_lock(int Ways); - -This function grab the lock for locking your code into the cache specified -by Ways. - - -2. cache_lock(int Ways); - -This function should be called after your critical code has been executed. -Once the critical code exits, the code is now loaded into the cache. This -function locks the code into the cache. - - -So, the example sequence will be: - - cache_grab_lock(WAY0_L); /* Grab the lock */ - - critical_code(); /* Execute the code of interest */ - - cache_lock(WAY0_L); /* Lock the cache */ - -Where WAY0_L signifies WAY0 locking. diff --git a/Documentation/blackfin/cachefeatures.txt b/Documentation/blackfin/cachefeatures.txt index 0fbec23becb5..75de51f94515 100644 --- a/Documentation/blackfin/cachefeatures.txt +++ b/Documentation/blackfin/cachefeatures.txt @@ -41,16 +41,6 @@ icplb_flush(); dcplb_flush(); - - Locking the cache. - - cache_grab_lock(); - cache_lock(); - - Please refer linux-2.6.x/Documentation/blackfin/cache-lock.txt for how to - lock the cache. - - Locking the cache is optional feature. - - Miscellaneous cache functions. flush_cache_all(); diff --git a/Documentation/blackfin/gptimers-example.c b/Documentation/blackfin/gptimers-example.c new file mode 100644 index 000000000000..b1bd6340e748 --- /dev/null +++ b/Documentation/blackfin/gptimers-example.c @@ -0,0 +1,83 @@ +/* + * Simple gptimers example + * http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:gptimers + * + * Copyright 2007-2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/interrupt.h> +#include <linux/module.h> + +#include <asm/gptimers.h> +#include <asm/portmux.h> + +/* ... random driver includes ... */ + +#define DRIVER_NAME "gptimer_example" + +struct gptimer_data { + uint32_t period, width; +}; +static struct gptimer_data data; + +/* ... random driver state ... */ + +static irqreturn_t gptimer_example_irq(int irq, void *dev_id) +{ + struct gptimer_data *data = dev_id; + + /* make sure it was our timer which caused the interrupt */ + if (!get_gptimer_intr(TIMER5_id)) + return IRQ_NONE; + + /* read the width/period values that were captured for the waveform */ + data->width = get_gptimer_pwidth(TIMER5_id); + data->period = get_gptimer_period(TIMER5_id); + + /* acknowledge the interrupt */ + clear_gptimer_intr(TIMER5_id); + + /* tell the upper layers we took care of things */ + return IRQ_HANDLED; +} + +/* ... random driver code ... */ + +static int __init gptimer_example_init(void) +{ + int ret; + + /* grab the peripheral pins */ + ret = peripheral_request(P_TMR5, DRIVER_NAME); + if (ret) { + printk(KERN_NOTICE DRIVER_NAME ": peripheral request failed\n"); + return ret; + } + + /* grab the IRQ for the timer */ + ret = request_irq(IRQ_TIMER5, gptimer_example_irq, IRQF_SHARED, DRIVER_NAME, &data); + if (ret) { + printk(KERN_NOTICE DRIVER_NAME ": IRQ request failed\n"); + peripheral_free(P_TMR5); + return ret; + } + + /* setup the timer and enable it */ + set_gptimer_config(TIMER5_id, WDTH_CAP | PULSE_HI | PERIOD_CNT | IRQ_ENA); + enable_gptimers(TIMER5bit); + + return 0; +} +module_init(gptimer_example_init); + +static void __exit gptimer_example_exit(void) +{ + disable_gptimers(TIMER5bit); + free_irq(IRQ_TIMER5, &data); + peripheral_free(P_TMR5); +} +module_exit(gptimer_example_exit); + +MODULE_LICENSE("BSD"); |