diff options
Diffstat (limited to 'arch/arm/mach-netx')
| -rw-r--r-- | arch/arm/mach-netx/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/mach-netx/pfifo.c | 68 |
2 files changed, 69 insertions, 1 deletions
diff --git a/arch/arm/mach-netx/Makefile b/arch/arm/mach-netx/Makefile index 257d02ef66d..cd424083e5b 100644 --- a/arch/arm/mach-netx/Makefile +++ b/arch/arm/mach-netx/Makefile @@ -7,5 +7,5 @@ # Object file lists. -obj-y += time.o generic.o +obj-y += time.o generic.o pfifo.o diff --git a/arch/arm/mach-netx/pfifo.c b/arch/arm/mach-netx/pfifo.c new file mode 100644 index 00000000000..44dea61a9de --- /dev/null +++ b/arch/arm/mach-netx/pfifo.c @@ -0,0 +1,68 @@ +/* + * arch/arm/mach-netx/pfifo.c + * + * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/mutex.h> + +#include <asm/io.h> +#include <asm/hardware.h> +#include <asm/arch/netx-regs.h> +#include <asm/arch/pfifo.h> + +static DEFINE_MUTEX(pfifo_lock); + +static unsigned int pfifo_used = 0; + +int pfifo_request(unsigned int pfifo_mask) +{ + int err = 0; + unsigned int val; + + mutex_lock(&pfifo_lock); + + if (pfifo_mask & pfifo_used) { + err = -EBUSY; + goto out; + } + + pfifo_used |= pfifo_mask; + + val = readl(NETX_PFIFO_RESET); + writel(val | pfifo_mask, NETX_PFIFO_RESET); + writel(val, NETX_PFIFO_RESET); + +out: + mutex_unlock(&pfifo_lock); + return err; +} + +void pfifo_free(unsigned int pfifo_mask) +{ + mutex_lock(&pfifo_lock); + pfifo_used &= ~pfifo_mask; + mutex_unlock(&pfifo_lock); +} + +EXPORT_SYMBOL(pfifo_push); +EXPORT_SYMBOL(pfifo_pop); +EXPORT_SYMBOL(pfifo_fill_level); +EXPORT_SYMBOL(pfifo_empty); +EXPORT_SYMBOL(pfifo_request); +EXPORT_SYMBOL(pfifo_free); |